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Subject[PATCH-v5 03/13] iscsi-target: Add iSCSI fabric support for target v4
Date
From: Nicholas Bellinger <nab@linux-iscsi.org>

The RisingTide Systems iSCSI target module is a full featured in-kernel
software implementation of iSCSI target mode (RFC-3720) for the mainline
target v4 infrastructure code. More information can be found here:

http://linux-iscsi.org/wiki/ISCSI

This includes support for:

* RFC-3720 defined request / response state machines and support for
all defined iSCSI operation codes from Section 10.2.1.2 using libiscsi
include/scsi/iscsi_proto.h PDU definitions
* Target v4 compatible control plane using the generic layout in
target_core_fabric_configfs.c and fabric dependent attributes
within /sys/kernel/config/target/iscsi/ subdirectories.
* Target v4 compatible iSCSI statistics based on RFC-4544 (iSCSI MIBS)
* Support for IPv6 and IPv4 network portals in M:N mapping to TPGs
* iSCSI Error Recovery Hierarchy support
* Per iSCSI connection RX/TX thread pair scheduling affinity
* crc32c + crc32c_intel SSEv4 instruction offload support using libcrypto
* CHAP Authentication support using libcrypto

Significant feedback for mainline code cleanups by Christoph Hellwig,
Mike Christie and Andy Grover. Also bugfixes for regressions and
testing by Martin Svec.

Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
---
drivers/target/iscsi/iscsi_target.c | 4962 ++++++++++++++++++++++++++++++
drivers/target/iscsi/iscsi_target.h | 42 +
drivers/target/iscsi/iscsi_target_core.h | 859 ++++++
3 files changed, 5863 insertions(+), 0 deletions(-)
create mode 100644 drivers/target/iscsi/iscsi_target.c
create mode 100644 drivers/target/iscsi/iscsi_target.h
create mode 100644 drivers/target/iscsi/iscsi_target_core.h

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
new file mode 100644
index 0000000..6bba5fd
--- /dev/null
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -0,0 +1,4962 @@
+/*******************************************************************************
+ * This file contains main functions related to the iSCSI Target Core Driver.
+ *
+ * © Copyright 2007-2011 RisingTide Systems LLC.
+ *
+ * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
+ *
+ * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ ******************************************************************************/
+
+#include <linux/string.h>
+#include <linux/kthread.h>
+#include <linux/crypto.h>
+#include <linux/completion.h>
+#include <asm/unaligned.h>
+#include <scsi/scsi_device.h>
+#include <scsi/iscsi_proto.h>
+#include <target/target_core_base.h>
+#include <target/target_core_tmr.h>
+#include <target/target_core_transport.h>
+
+#include "iscsi_target_debug.h"
+#include "iscsi_target_core.h"
+#include "iscsi_target_parameters.h"
+#include "iscsi_target_seq_pdu_list.h"
+#include "iscsi_target_tq.h"
+#include "iscsi_target_configfs.h"
+#include "iscsi_target_datain_values.h"
+#include "iscsi_target_erl0.h"
+#include "iscsi_target_erl1.h"
+#include "iscsi_target_erl2.h"
+#include "iscsi_target_login.h"
+#include "iscsi_target_tmr.h"
+#include "iscsi_target_tpg.h"
+#include "iscsi_target_util.h"
+#include "iscsi_target.h"
+#include "iscsi_target_device.h"
+#include "iscsi_target_stat.h"
+
+static LIST_HEAD(g_tiqn_list);
+static LIST_HEAD(g_np_list);
+static DEFINE_SPINLOCK(tiqn_lock);
+static DEFINE_SPINLOCK(np_lock);
+
+static struct idr tiqn_idr;
+struct idr sess_idr;
+struct mutex auth_id_lock;
+spinlock_t sess_idr_lock;
+
+struct iscsit_global *iscsit_global;
+
+struct kmem_cache *lio_cmd_cache;
+struct kmem_cache *lio_qr_cache;
+struct kmem_cache *lio_dr_cache;
+struct kmem_cache *lio_ooo_cache;
+struct kmem_cache *lio_r2t_cache;
+
+static int iscsit_handle_immediate_data(struct iscsi_cmd *,
+ unsigned char *buf, u32);
+static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
+
+struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
+{
+ struct iscsi_tiqn *tiqn = NULL;
+
+ spin_lock(&tiqn_lock);
+ list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
+ if (!strcmp(tiqn->tiqn, buf)) {
+
+ spin_lock(&tiqn->tiqn_state_lock);
+ if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
+ tiqn->tiqn_access_count++;
+ spin_unlock(&tiqn->tiqn_state_lock);
+ spin_unlock(&tiqn_lock);
+ return tiqn;
+ }
+ spin_unlock(&tiqn->tiqn_state_lock);
+ }
+ }
+ spin_unlock(&tiqn_lock);
+
+ return NULL;
+}
+
+static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
+{
+ spin_lock(&tiqn->tiqn_state_lock);
+ if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
+ tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
+ spin_unlock(&tiqn->tiqn_state_lock);
+ return 0;
+ }
+ spin_unlock(&tiqn->tiqn_state_lock);
+
+ return -1;
+}
+
+void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
+{
+ spin_lock(&tiqn->tiqn_state_lock);
+ tiqn->tiqn_access_count--;
+ spin_unlock(&tiqn->tiqn_state_lock);
+}
+
+/*
+ * Note that IQN formatting is expected to be done in userspace, and
+ * no explict IQN format checks are done here.
+ */
+struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
+{
+ struct iscsi_tiqn *tiqn = NULL;
+ int ret;
+
+ if (strlen(buf) > ISCSI_IQN_LEN) {
+ printk(KERN_ERR "Target IQN exceeds %d bytes\n",
+ ISCSI_IQN_LEN);
+ return ERR_PTR(-EINVAL);
+ }
+
+ tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
+ if (!tiqn) {
+ printk(KERN_ERR "Unable to allocate struct iscsi_tiqn\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ sprintf(tiqn->tiqn, "%s", buf);
+ INIT_LIST_HEAD(&tiqn->tiqn_list);
+ INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
+ spin_lock_init(&tiqn->tiqn_state_lock);
+ spin_lock_init(&tiqn->tiqn_tpg_lock);
+ spin_lock_init(&tiqn->sess_err_stats.lock);
+ spin_lock_init(&tiqn->login_stats.lock);
+ spin_lock_init(&tiqn->logout_stats.lock);
+
+ if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
+ printk(KERN_ERR "idr_pre_get() for tiqn_idr failed\n");
+ kfree(tiqn);
+ return ERR_PTR(-ENOMEM);
+ }
+ tiqn->tiqn_state = TIQN_STATE_ACTIVE;
+
+ spin_lock(&tiqn_lock);
+ ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
+ if (ret < 0) {
+ printk("idr_get_new() failed for tiqn->tiqn_index\n");
+ spin_unlock(&tiqn_lock);
+ kfree(tiqn);
+ return ERR_PTR(ret);
+ }
+ list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
+ spin_unlock(&tiqn_lock);
+
+ printk(KERN_INFO "CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
+
+ return tiqn;
+
+}
+
+static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
+{
+ /*
+ * Wait for accesses to said struct iscsi_tiqn to end.
+ */
+ spin_lock(&tiqn->tiqn_state_lock);
+ while (tiqn->tiqn_access_count != 0) {
+ spin_unlock(&tiqn->tiqn_state_lock);
+ msleep(10);
+ spin_lock(&tiqn->tiqn_state_lock);
+ }
+ spin_unlock(&tiqn->tiqn_state_lock);
+}
+
+void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
+{
+ /*
+ * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
+ * while holding tiqn->tiqn_state_lock. This means that all subsequent
+ * attempts to access this struct iscsi_tiqn will fail from both transport
+ * fabric and control code paths.
+ */
+ if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
+ printk(KERN_ERR "iscsit_set_tiqn_shutdown() failed\n");
+ return;
+ }
+
+ iscsit_wait_for_tiqn(tiqn);
+
+ spin_lock(&tiqn_lock);
+ list_del(&tiqn->tiqn_list);
+ idr_remove(&tiqn_idr, tiqn->tiqn_index);
+ spin_unlock(&tiqn_lock);
+
+ printk(KERN_INFO "CORE[0] - Deleted iSCSI Target IQN: %s\n",
+ tiqn->tiqn);
+ kfree(tiqn);
+}
+
+int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
+{
+ int ret;
+ /*
+ * Determine if the network portal is accepting storage traffic.
+ */
+ spin_lock_bh(&np->np_thread_lock);
+ if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
+ spin_unlock_bh(&np->np_thread_lock);
+ return -1;
+ }
+ if (np->np_login_tpg) {
+ printk(KERN_ERR "np->np_login_tpg() is not NULL!\n");
+ spin_unlock_bh(&np->np_thread_lock);
+ return -1;
+ }
+ spin_unlock_bh(&np->np_thread_lock);
+ /*
+ * Determine if the portal group is accepting storage traffic.
+ */
+ spin_lock_bh(&tpg->tpg_state_lock);
+ if (tpg->tpg_state != TPG_STATE_ACTIVE) {
+ spin_unlock_bh(&tpg->tpg_state_lock);
+ return -1;
+ }
+ spin_unlock_bh(&tpg->tpg_state_lock);
+
+ /*
+ * Here we serialize access across the TIQN+TPG Tuple.
+ */
+ ret = mutex_lock_interruptible(&tpg->np_login_lock);
+ if ((ret != 0) || signal_pending(current))
+ return -1;
+
+ spin_lock_bh(&np->np_thread_lock);
+ np->np_login_tpg = tpg;
+ spin_unlock_bh(&np->np_thread_lock);
+
+ return 0;
+}
+
+int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
+{
+ struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
+
+ spin_lock_bh(&np->np_thread_lock);
+ np->np_login_tpg = NULL;
+ spin_unlock_bh(&np->np_thread_lock);
+
+ mutex_unlock(&tpg->np_login_lock);
+
+ if (tiqn)
+ iscsit_put_tiqn_for_login(tiqn);
+
+ return 0;
+}
+
+static struct iscsi_np *iscsit_get_np(
+ struct __kernel_sockaddr_storage *sockaddr,
+ int network_transport)
+{
+ struct sockaddr_in *sock_in, *sock_in_e;
+ struct sockaddr_in6 *sock_in6, *sock_in6_e;
+ struct iscsi_np *np;
+ int ip_match = 0;
+ u16 port;
+
+ spin_lock_bh(&np_lock);
+ list_for_each_entry(np, &g_np_list, np_list) {
+ spin_lock(&np->np_thread_lock);
+ if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
+ spin_unlock(&np->np_thread_lock);
+ continue;
+ }
+
+ if (sockaddr->ss_family == AF_INET6) {
+ sock_in6 = (struct sockaddr_in6 *)sockaddr;
+ sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
+
+ if (!memcmp((void *)&sock_in6->sin6_addr.in6_u,
+ (void *)&sock_in6_e->sin6_addr.in6_u,
+ sizeof(struct in6_addr)))
+ ip_match = 1;
+
+ port = ntohs(sock_in6->sin6_port);
+ } else {
+ sock_in = (struct sockaddr_in *)sockaddr;
+ sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
+
+ if (sock_in->sin_addr.s_addr ==
+ sock_in_e->sin_addr.s_addr)
+ ip_match = 1;
+
+ port = ntohs(sock_in->sin_port);
+ }
+
+ if ((ip_match == 1) && (np->np_port == port) &&
+ (np->np_network_transport == network_transport)) {
+ /*
+ * Increment the np_exports reference count now to
+ * prevent iscsit_del_np() below from being called
+ * while iscsi_tpg_add_network_portal() is called.
+ */
+ np->np_exports++;
+ spin_unlock(&np->np_thread_lock);
+ spin_unlock_bh(&np_lock);
+ return np;
+ }
+ spin_unlock(&np->np_thread_lock);
+ }
+ spin_unlock_bh(&np_lock);
+
+ return NULL;
+}
+
+struct iscsi_np *iscsit_add_np(
+ struct __kernel_sockaddr_storage *sockaddr,
+ char *ip_str,
+ int network_transport)
+{
+ struct sockaddr_in *sock_in;
+ struct sockaddr_in6 *sock_in6;
+ struct iscsi_np *np;
+ int ret;
+ /*
+ * Locate the existing struct iscsi_np if already active..
+ */
+ np = iscsit_get_np(sockaddr, network_transport);
+ if (np)
+ return np;
+
+ np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
+ if (!np) {
+ printk(KERN_ERR "Unable to allocate memory for struct iscsi_np\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ np->np_flags |= NPF_IP_NETWORK;
+ if (sockaddr->ss_family == AF_INET6) {
+ sock_in6 = (struct sockaddr_in6 *)sockaddr;
+ snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
+ np->np_port = ntohs(sock_in6->sin6_port);
+ } else {
+ sock_in = (struct sockaddr_in *)sockaddr;
+ sprintf(np->np_ip, "%s", ip_str);
+ np->np_port = ntohs(sock_in->sin_port);
+ }
+
+ np->np_network_transport = network_transport;
+ spin_lock_init(&np->np_thread_lock);
+ init_completion(&np->np_restart_comp);
+ INIT_LIST_HEAD(&np->np_list);
+
+ ret = iscsi_target_setup_login_socket(np, sockaddr);
+ if (ret != 0) {
+ kfree(np);
+ return ERR_PTR(ret);
+ }
+
+ np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
+ if (IS_ERR(np->np_thread)) {
+ printk(KERN_ERR "Unable to create kthread: iscsi_np\n");
+ ret = PTR_ERR(np->np_thread);
+ kfree(np);
+ return ERR_PTR(ret);
+ }
+ /*
+ * Increment the np_exports reference count now to prevent
+ * iscsit_del_np() below from being run while a new call to
+ * iscsi_tpg_add_network_portal() for a matching iscsi_np is
+ * active. We don't need to hold np->np_thread_lock at this
+ * point because iscsi_np has not been added to g_np_list yet.
+ */
+ np->np_exports = 1;
+
+ spin_lock_bh(&np_lock);
+ list_add_tail(&np->np_list, &g_np_list);
+ spin_unlock_bh(&np_lock);
+
+ printk(KERN_INFO "CORE[0] - Added Network Portal: %s:%hu on %s\n",
+ np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
+ "TCP" : "SCTP");
+
+ return np;
+}
+
+int iscsit_reset_np_thread(
+ struct iscsi_np *np,
+ struct iscsi_tpg_np *tpg_np,
+ struct iscsi_portal_group *tpg)
+{
+ spin_lock_bh(&np->np_thread_lock);
+ if (tpg && tpg_np) {
+ /*
+ * The reset operation need only be performed when the
+ * passed struct iscsi_portal_group has a login in progress
+ * to one of the network portals.
+ */
+ if (tpg_np->tpg_np->np_login_tpg != tpg) {
+ spin_unlock_bh(&np->np_thread_lock);
+ return 0;
+ }
+ }
+ if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
+ spin_unlock_bh(&np->np_thread_lock);
+ return 0;
+ }
+ np->np_thread_state = ISCSI_NP_THREAD_RESET;
+
+ if (np->np_thread) {
+ spin_unlock_bh(&np->np_thread_lock);
+ send_sig(SIGINT, np->np_thread, 1);
+ wait_for_completion(&np->np_restart_comp);
+ spin_lock_bh(&np->np_thread_lock);
+ }
+ spin_unlock_bh(&np->np_thread_lock);
+
+ return 0;
+}
+
+int iscsit_del_np_comm(struct iscsi_np *np)
+{
+ if (!np->np_socket)
+ return 0;
+
+ /*
+ * Some network transports allocate their own struct sock->file,
+ * see if we need to free any additional allocated resources.
+ */
+ if (np->np_flags & NPF_SCTP_STRUCT_FILE) {
+ kfree(np->np_socket->file);
+ np->np_socket->file = NULL;
+ }
+
+ sock_release(np->np_socket);
+ return 0;
+}
+
+int iscsit_del_np(struct iscsi_np *np)
+{
+ spin_lock_bh(&np->np_thread_lock);
+ if (!(--np->np_exports == 0)) {
+ spin_unlock_bh(&np->np_thread_lock);
+ return 0;
+ }
+ np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
+ spin_unlock_bh(&np->np_thread_lock);
+
+ if (np->np_thread) {
+ /*
+ * We need to send the signal to wakeup Linux/Net
+ * which may be sleeping in sock_accept()..
+ */
+ send_sig(SIGINT, np->np_thread, 1);
+ kthread_stop(np->np_thread);
+ }
+ iscsit_del_np_comm(np);
+
+ spin_lock_bh(&np_lock);
+ list_del(&np->np_list);
+ spin_unlock_bh(&np_lock);
+
+ printk(KERN_INFO "CORE[0] - Removed Network Portal: %s:%hu on %s\n",
+ np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
+ "TCP" : "SCTP");
+
+ kfree(np);
+ return 0;
+}
+
+static int __init iscsi_target_init_module(void)
+{
+ int ret = 0;
+
+ printk(KERN_INFO "iSCSI-Target "ISCSIT_VERSION"\n");
+
+ iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
+ if (!iscsit_global) {
+ printk(KERN_ERR "Unable to allocate memory for iscsit_global\n");
+ return -1;
+ }
+ mutex_init(&auth_id_lock);
+ spin_lock_init(&sess_idr_lock);
+ idr_init(&tiqn_idr);
+ idr_init(&sess_idr);
+
+ ret = iscsi_target_register_configfs();
+ if (ret < 0)
+ goto out;
+
+ ret = iscsi_thread_set_init();
+ if (ret < 0)
+ goto configfs_out;
+
+ if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
+ TARGET_THREAD_SET_COUNT) {
+ printk(KERN_ERR "iscsi_allocate_thread_sets() returned"
+ " unexpected value!\n");
+ goto ts_out1;
+ }
+
+ lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
+ sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
+ 0, NULL);
+ if (!lio_cmd_cache) {
+ printk(KERN_ERR "Unable to kmem_cache_create() for"
+ " lio_cmd_cache\n");
+ goto ts_out2;
+ }
+
+ lio_qr_cache = kmem_cache_create("lio_qr_cache",
+ sizeof(struct iscsi_queue_req),
+ __alignof__(struct iscsi_queue_req), 0, NULL);
+ if (!lio_qr_cache) {
+ printk(KERN_ERR "nable to kmem_cache_create() for"
+ " lio_qr_cache\n");
+ goto cmd_out;
+ }
+
+ lio_dr_cache = kmem_cache_create("lio_dr_cache",
+ sizeof(struct iscsi_datain_req),
+ __alignof__(struct iscsi_datain_req), 0, NULL);
+ if (!lio_dr_cache) {
+ printk(KERN_ERR "Unable to kmem_cache_create() for"
+ " lio_dr_cache\n");
+ goto qr_out;
+ }
+
+ lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
+ sizeof(struct iscsi_ooo_cmdsn),
+ __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
+ if (!lio_ooo_cache) {
+ printk(KERN_ERR "Unable to kmem_cache_create() for"
+ " lio_ooo_cache\n");
+ goto dr_out;
+ }
+
+ lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
+ sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
+ 0, NULL);
+ if (!lio_r2t_cache) {
+ printk(KERN_ERR "Unable to kmem_cache_create() for"
+ " lio_r2t_cache\n");
+ goto ooo_out;
+ }
+
+ if (iscsit_load_discovery_tpg() < 0)
+ goto r2t_out;
+
+ return ret;
+r2t_out:
+ kmem_cache_destroy(lio_r2t_cache);
+ooo_out:
+ kmem_cache_destroy(lio_ooo_cache);
+dr_out:
+ kmem_cache_destroy(lio_dr_cache);
+qr_out:
+ kmem_cache_destroy(lio_qr_cache);
+cmd_out:
+ kmem_cache_destroy(lio_cmd_cache);
+ts_out2:
+ iscsi_deallocate_thread_sets();
+ts_out1:
+ iscsi_thread_set_free();
+configfs_out:
+ iscsi_target_deregister_configfs();
+out:
+ kfree(iscsit_global);
+ return -ENOMEM;
+}
+
+static void __exit iscsi_target_cleanup_module(void)
+{
+ iscsi_deallocate_thread_sets();
+ iscsi_thread_set_free();
+ iscsit_release_discovery_tpg();
+ kmem_cache_destroy(lio_cmd_cache);
+ kmem_cache_destroy(lio_qr_cache);
+ kmem_cache_destroy(lio_dr_cache);
+ kmem_cache_destroy(lio_ooo_cache);
+ kmem_cache_destroy(lio_r2t_cache);
+
+ iscsi_target_deregister_configfs();
+
+ kfree(iscsit_global);
+}
+
+int iscsit_add_reject(
+ u8 reason,
+ int fail_conn,
+ unsigned char *buf,
+ struct iscsi_conn *conn)
+{
+ struct iscsi_cmd *cmd;
+ struct iscsi_reject *hdr;
+ int ret;
+
+ cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
+ if (!cmd)
+ return -1;
+
+ cmd->iscsi_opcode = ISCSI_OP_REJECT;
+ if (fail_conn)
+ cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
+
+ hdr = (struct iscsi_reject *) cmd->pdu;
+ hdr->reason = reason;
+
+ cmd->buf_ptr = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL);
+ if (!cmd->buf_ptr) {
+ printk(KERN_ERR "Unable to allocate memory for cmd->buf_ptr\n");
+ iscsit_release_cmd(cmd);
+ return -1;
+ }
+ memcpy(cmd->buf_ptr, buf, ISCSI_HDR_LEN);
+
+ spin_lock_bh(&conn->cmd_lock);
+ list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
+ spin_unlock_bh(&conn->cmd_lock);
+
+ cmd->i_state = ISTATE_SEND_REJECT;
+ iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
+
+ ret = wait_for_completion_interruptible(&cmd->reject_comp);
+ if (ret != 0)
+ return -1;
+
+ return (!fail_conn) ? 0 : -1;
+}
+
+int iscsit_add_reject_from_cmd(
+ u8 reason,
+ int fail_conn,
+ int add_to_conn,
+ unsigned char *buf,
+ struct iscsi_cmd *cmd)
+{
+ struct iscsi_conn *conn;
+ struct iscsi_reject *hdr;
+ int ret;
+
+ if (!cmd->conn) {
+ printk(KERN_ERR "cmd->conn is NULL for ITT: 0x%08x\n",
+ cmd->init_task_tag);
+ return -1;
+ }
+ conn = cmd->conn;
+
+ cmd->iscsi_opcode = ISCSI_OP_REJECT;
+ if (fail_conn)
+ cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
+
+ hdr = (struct iscsi_reject *) cmd->pdu;
+ hdr->reason = reason;
+
+ cmd->buf_ptr = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL);
+ if (!cmd->buf_ptr) {
+ printk(KERN_ERR "Unable to allocate memory for cmd->buf_ptr\n");
+ iscsit_release_cmd(cmd);
+ return -1;
+ }
+ memcpy(cmd->buf_ptr, buf, ISCSI_HDR_LEN);
+
+ if (add_to_conn) {
+ spin_lock_bh(&conn->cmd_lock);
+ list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
+ spin_unlock_bh(&conn->cmd_lock);
+ }
+
+ cmd->i_state = ISTATE_SEND_REJECT;
+ iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
+
+ ret = wait_for_completion_interruptible(&cmd->reject_comp);
+ if (ret != 0)
+ return -1;
+
+ return (!fail_conn) ? 0 : -1;
+}
+
+static void iscsit_calculate_map_segment(
+ u32 *data_length,
+ struct se_offset_map *lm)
+{
+ u32 sg_offset = 0;
+ struct se_mem *se_mem = lm->map_se_mem;
+ /*
+ * Still working on pages in the current struct se_mem.
+ */
+ if (!lm->map_reset) {
+ lm->iovec_length = (lm->sg_length > PAGE_SIZE) ?
+ PAGE_SIZE : lm->sg_length;
+ if (*data_length < lm->iovec_length)
+ lm->iovec_length = *data_length;
+
+ lm->iovec_base = page_address(lm->sg_page) + sg_offset;
+ return;
+ }
+
+ /*
+ * First run of an iscsi_linux_map_t.
+ *
+ * OR:
+ *
+ * Mapped all of the pages in the current scatterlist, move
+ * on to the next one.
+ */
+ lm->map_reset = 0;
+ sg_offset = se_mem->se_off;
+ lm->sg_page = se_mem->se_page;
+ lm->sg_length = se_mem->se_len;
+ /*
+ * Get the base and length of the current page for use with the iovec.
+ */
+recalc:
+ lm->iovec_length = (lm->sg_length > (PAGE_SIZE - sg_offset)) ?
+ (PAGE_SIZE - sg_offset) : lm->sg_length;
+ /*
+ * See if there is any iSCSI offset we need to deal with.
+ */
+ if (!lm->current_offset) {
+ lm->iovec_base = page_address(lm->sg_page) + sg_offset;
+
+ if (*data_length < lm->iovec_length)
+ lm->iovec_length = *data_length;
+
+ return;
+ }
+
+ /*
+ * We know the iSCSI offset is in the next page of the current
+ * scatterlist. Increase the lm->sg_page pointer and try again.
+ */
+ if (lm->current_offset >= lm->iovec_length) {
+ lm->current_offset -= lm->iovec_length;
+ lm->sg_length -= lm->iovec_length;
+ lm->sg_page++;
+ sg_offset = 0;
+
+ goto recalc;
+ }
+
+ /*
+ * The iSCSI offset is in the current page, increment the iovec
+ * base and reduce iovec length.
+ */
+ lm->iovec_base = page_address(lm->sg_page);
+
+ lm->iovec_base += sg_offset;
+ lm->iovec_base += lm->current_offset;
+
+ if ((lm->iovec_length - lm->current_offset) < *data_length)
+ lm->iovec_length -= lm->current_offset;
+ else
+ lm->iovec_length = *data_length;
+
+ if ((lm->sg_length - lm->current_offset) < *data_length)
+ lm->sg_length -= lm->current_offset;
+ else
+ lm->sg_length = *data_length;
+
+ lm->current_offset = 0;
+}
+
+static int iscsit_get_offset(
+ struct se_offset_map *lmap,
+ struct se_unmap_sg *usg)
+{
+ u32 current_length = 0, current_iscsi_offset = lmap->iscsi_offset;
+ u32 total_offset = 0;
+ struct se_cmd *cmd = usg->se_cmd;
+ struct se_mem *se_mem;
+
+ list_for_each_entry(se_mem, cmd->t_task->t_mem_list, se_list)
+ break;
+
+ if (!se_mem) {
+ printk(KERN_ERR "Unable to locate se_mem from"
+ " cmd->t_task->t_mem_list\n");
+ return -1;
+ }
+
+ /*
+ * Locate the current offset from the passed iSCSI Offset.
+ */
+ while (lmap->iscsi_offset != current_length) {
+ /*
+ * The iSCSI Offset is within the current struct se_mem.
+ *
+ * Or:
+ *
+ * The iSCSI Offset is outside of the current struct se_mem.
+ * Recalculate the values and obtain the next struct se_mem pointer.
+ */
+ total_offset += se_mem->se_len;
+
+ if (total_offset > lmap->iscsi_offset) {
+ current_length += current_iscsi_offset;
+ lmap->orig_offset = lmap->current_offset =
+ usg->t_offset = current_iscsi_offset;
+ } else {
+ current_length += se_mem->se_len;
+ current_iscsi_offset -= se_mem->se_len;
+
+ list_for_each_entry_continue(se_mem,
+ cmd->t_task->t_mem_list, se_list)
+ break;
+
+ if (!se_mem) {
+ printk(KERN_ERR "Unable to locate struct se_mem\n");
+ return -1;
+ }
+ }
+ }
+ lmap->map_orig_se_mem = se_mem;
+ usg->cur_se_mem = se_mem;
+
+ return 0;
+}
+
+static int iscsit_set_iovec_ptrs(
+ struct se_map_sg *map_sg,
+ struct se_unmap_sg *unmap_sg)
+{
+ u32 i = 0 /* For iovecs */, j = 0 /* For scatterlists */;
+ struct se_cmd *cmd = map_sg->se_cmd;
+ struct iscsi_cmd *i_cmd = container_of(cmd, struct iscsi_cmd, se_cmd);
+ struct se_offset_map *lmap = &unmap_sg->lmap;
+ struct kvec *iov = map_sg->iov;
+
+ /*
+ * Used for non scatterlist operations, assume a single iovec.
+ */
+ if (!cmd->t_task->t_tasks_se_num) {
+ iov[0].iov_base = (unsigned char *) cmd->t_task->t_task_buf +
+ map_sg->data_offset;
+ iov[0].iov_len = map_sg->data_length;
+ return 1;
+ }
+
+ /*
+ * Set lmap->map_reset = 1 so the first call to
+ * iscsit_calculate_map_segment() sets up the initial
+ * values for struct se_offset_map.
+ */
+ lmap->map_reset = 1;
+ /*
+ * Get a pointer to the first used scatterlist based on the passed
+ * offset. Also set the rest of the needed values in iscsi_linux_map_t.
+ */
+ lmap->iscsi_offset = map_sg->data_offset;
+ if (map_sg->sg_kmap_active) {
+ unmap_sg->se_cmd = map_sg->se_cmd;
+ iscsit_get_offset(lmap, unmap_sg);
+ unmap_sg->data_length = map_sg->data_length;
+ } else {
+ lmap->current_offset = lmap->orig_offset;
+ }
+ lmap->map_se_mem = lmap->map_orig_se_mem;
+
+ while (map_sg->data_length) {
+ /*
+ * Time to get the virtual address for use with iovec pointers.
+ * This function will return the expected iovec_base address
+ * and iovec_length.
+ */
+ iscsit_calculate_map_segment(&map_sg->data_length, lmap);
+
+ /*
+ * Set the iov.iov_base and iov.iov_len from the current values
+ * in iscsi_linux_map_t.
+ */
+ iov[i].iov_base = lmap->iovec_base;
+ iov[i].iov_len = lmap->iovec_length;
+
+ /*
+ * Subtract the final iovec length from the total length to be
+ * mapped, and the length of the current scatterlist. Also
+ * perform the paranoid check to make sure we are not going to
+ * overflow the iovecs allocated for this command in the next
+ * pass.
+ */
+ map_sg->data_length -= iov[i].iov_len;
+ lmap->sg_length -= iov[i].iov_len;
+
+ if ((++i + 1) > i_cmd->orig_iov_data_count) {
+ printk(KERN_ERR "Current iovec count %u is greater than"
+ " struct se_cmd->orig_data_iov_count %u, cannot"
+ " continue.\n", i+1, i_cmd->orig_iov_data_count);
+ return -1;
+ }
+
+ /*
+ * All done mapping this scatterlist's pages, move on to
+ * the next scatterlist by setting lmap.map_reset = 1;
+ */
+ if (!lmap->sg_length || !map_sg->data_length) {
+ list_for_each_entry(lmap->map_se_mem,
+ &lmap->map_se_mem->se_list, se_list)
+ break;
+
+ if (!lmap->map_se_mem) {
+ printk(KERN_ERR "Unable to locate next"
+ " lmap->map_struct se_mem entry\n");
+ return -1;
+ }
+ j++;
+
+ lmap->sg_page = NULL;
+ lmap->map_reset = 1;
+ } else
+ lmap->sg_page++;
+ }
+
+ unmap_sg->sg_count = j;
+
+ return i;
+}
+
+static void iscsit_map_SG_segments(struct se_unmap_sg *unmap_sg)
+{
+ u32 i = 0;
+ struct se_cmd *cmd = unmap_sg->se_cmd;
+ struct se_mem *se_mem = unmap_sg->cur_se_mem;
+
+ if (!cmd->t_task->t_tasks_se_num)
+ return;
+
+ list_for_each_entry_continue(se_mem, cmd->t_task->t_mem_list, se_list) {
+ kmap(se_mem->se_page);
+
+ if (++i == unmap_sg->sg_count)
+ break;
+ }
+}
+
+static void iscsit_unmap_SG_segments(struct se_unmap_sg *unmap_sg)
+{
+ u32 i = 0;
+ struct se_cmd *cmd = unmap_sg->se_cmd;
+ struct se_mem *se_mem = unmap_sg->cur_se_mem;
+
+ if (!cmd->t_task->t_tasks_se_num)
+ return;
+
+ list_for_each_entry_continue(se_mem, cmd->t_task->t_mem_list, se_list) {
+ kunmap(se_mem->se_page);
+
+ if (++i == unmap_sg->sg_count)
+ break;
+ }
+}
+
+static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
+{
+ struct iscsi_cmd *cmd;
+
+ conn->exp_statsn = exp_statsn;
+
+ spin_lock_bh(&conn->cmd_lock);
+ list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
+ spin_lock(&cmd->istate_lock);
+ if ((cmd->i_state == ISTATE_SENT_STATUS) &&
+ (cmd->stat_sn < exp_statsn)) {
+ cmd->i_state = ISTATE_REMOVE;
+ spin_unlock(&cmd->istate_lock);
+ iscsit_add_cmd_to_immediate_queue(cmd, conn,
+ cmd->i_state);
+ continue;
+ }
+ spin_unlock(&cmd->istate_lock);
+ }
+ spin_unlock_bh(&conn->cmd_lock);
+}
+
+static int iscsit_handle_scsi_cmd(
+ struct iscsi_conn *conn,
+ unsigned char *buf)
+{
+ int data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
+ int dump_immediate_data = 0, send_check_condition = 0, payload_length;
+ struct iscsi_cmd *cmd = NULL;
+ struct iscsi_scsi_req *hdr;
+
+ spin_lock_bh(&conn->sess->session_stats_lock);
+ conn->sess->cmd_pdus++;
+ if (conn->sess->se_sess->se_node_acl) {
+ spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
+ conn->sess->se_sess->se_node_acl->num_cmds++;
+ spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
+ }
+ spin_unlock_bh(&conn->sess->session_stats_lock);
+
+ hdr = (struct iscsi_scsi_req *) buf;
+ payload_length = ntoh24(hdr->dlength);
+ hdr->itt = be32_to_cpu(hdr->itt);
+ hdr->data_length = be32_to_cpu(hdr->data_length);
+ hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
+ hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
+
+ /* FIXME; Add checks for AdditionalHeaderSegment */
+
+ if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
+ !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
+ printk(KERN_ERR "ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
+ " not set. Bad iSCSI Initiator.\n");
+ return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
+ buf, conn);
+ }
+
+ if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
+ (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
+ /*
+ * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
+ * that adds support for RESERVE/RELEASE. There is a bug
+ * add with this new functionality that sets R/W bits when
+ * neither CDB carries any READ or WRITE datapayloads.
+ */
+ if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
+ hdr->flags &= ~ISCSI_FLAG_CMD_READ;
+ hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
+ goto done;
+ }
+
+ printk(KERN_ERR "ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
+ " set when Expected Data Transfer Length is 0 for"
+ " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
+ return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
+ buf, conn);
+ }
+done:
+
+ if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
+ !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
+ printk(KERN_ERR "ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
+ " MUST be set if Expected Data Transfer Length is not 0."
+ " Bad iSCSI Initiator\n");
+ return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
+ buf, conn);
+ }
+
+ if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
+ (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
+ printk(KERN_ERR "Bidirectional operations not supported!\n");
+ return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
+ buf, conn);
+ }
+
+ if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
+ printk(KERN_ERR "Illegally set Immediate Bit in iSCSI Initiator"
+ " Scsi Command PDU.\n");
+ return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
+ buf, conn);
+ }
+
+ if (payload_length && !conn->sess->sess_ops->ImmediateData) {
+ printk(KERN_ERR "ImmediateData=No but DataSegmentLength=%u,"
+ " protocol error.\n", payload_length);
+ return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
+ buf, conn);
+ }
+
+ if ((hdr->data_length == payload_length) &&
+ (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
+ printk(KERN_ERR "Expected Data Transfer Length and Length of"
+ " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
+ " bit is not set protocol error\n");
+ return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
+ buf, conn);
+ }
+
+ if (payload_length > hdr->data_length) {
+ printk(KERN_ERR "DataSegmentLength: %u is greater than"
+ " EDTL: %u, protocol error.\n", payload_length,
+ hdr->data_length);
+ return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
+ buf, conn);
+ }
+
+ if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
+ printk(KERN_ERR "DataSegmentLength: %u is greater than"
+ " MaxRecvDataSegmentLength: %u, protocol error.\n",
+ payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
+ return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
+ buf, conn);
+ }
+
+ if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
+ printk(KERN_ERR "DataSegmentLength: %u is greater than"
+ " FirstBurstLength: %u, protocol error.\n",
+ payload_length, conn->sess->sess_ops->FirstBurstLength);
+ return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
+ buf, conn);
+ }
+
+ data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
+ (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
+ DMA_NONE;
+
+ cmd = iscsit_allocate_se_cmd(conn, hdr->data_length, data_direction,
+ (hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK));
+ if (!cmd)
+ return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
+ buf, conn);
+
+ TRACE(TRACE_ISCSI, "Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
+ " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
+ hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
+
+ cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
+ cmd->i_state = ISTATE_NEW_CMD;
+ cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
+ cmd->immediate_data = (payload_length) ? 1 : 0;
+ cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
+ (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
+ if (cmd->unsolicited_data)
+ cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
+
+ conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
+ if (hdr->flags & ISCSI_FLAG_CMD_READ) {
+ spin_lock_bh(&conn->sess->ttt_lock);
+ cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
+ if (cmd->targ_xfer_tag == 0xFFFFFFFF)
+ cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
+ spin_unlock_bh(&conn->sess->ttt_lock);
+ } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
+ cmd->targ_xfer_tag = 0xFFFFFFFF;
+ cmd->cmd_sn = hdr->cmdsn;
+ cmd->exp_stat_sn = hdr->exp_statsn;
+ cmd->first_burst_len = payload_length;
+
+ if (cmd->data_direction == DMA_FROM_DEVICE) {
+ struct iscsi_datain_req *dr;
+
+ dr = iscsit_allocate_datain_req();
+ if (!dr)
+ return iscsit_add_reject_from_cmd(
+ ISCSI_REASON_BOOKMARK_NO_RESOURCES,
+ 1, 1, buf, cmd);
+
+ iscsit_attach_datain_req(cmd, dr);
+ }
+
+ /*
+ * The CDB is going to an se_device_t.
+ */
+ ret = iscsit_get_lun_for_cmd(cmd, hdr->cdb,
+ get_unaligned_le64(&hdr->lun[0]));
+ if (ret < 0) {
+ if (SE_CMD(cmd)->scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
+ TRACE(TRACE_VANITY, "Responding to non-acl'ed,"
+ " non-existent or non-exported iSCSI LUN:"
+ " 0x%016Lx\n", get_unaligned_le64(&hdr->lun[0]));
+ }
+ if (ret == PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES)
+ return iscsit_add_reject_from_cmd(
+ ISCSI_REASON_BOOKMARK_NO_RESOURCES,
+ 1, 1, buf, cmd);
+
+ send_check_condition = 1;
+ goto attach_cmd;
+ }
+ /*
+ * The Initiator Node has access to the LUN (the addressing method
+ * is handled inside of iscsit_get_lun_for_cmd()). Now it's time to
+ * allocate 1->N transport tasks (depending on sector count and
+ * maximum request size the physical HBA(s) can handle.
+ */
+ transport_ret = transport_generic_allocate_tasks(SE_CMD(cmd), hdr->cdb);
+ if (transport_ret == -ENOMEM) {
+ return iscsit_add_reject_from_cmd(
+ ISCSI_REASON_BOOKMARK_NO_RESOURCES,
+ 1, 1, buf, cmd);
+ } else if (transport_ret == -EINVAL) {
+ /*
+ * Unsupported SAM Opcode. CHECK_CONDITION will be sent
+ * in iscsit_execute_cmd() during the CmdSN OOO Execution
+ * Mechinism.
+ */
+ send_check_condition = 1;
+ } else {
+ if (iscsit_decide_list_to_build(cmd, payload_length) < 0)
+ return iscsit_add_reject_from_cmd(
+ ISCSI_REASON_BOOKMARK_NO_RESOURCES,
+ 1, 1, buf, cmd);
+ }
+
+attach_cmd:
+ spin_lock_bh(&conn->cmd_lock);
+ list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
+ spin_unlock_bh(&conn->cmd_lock);
+ /*
+ * Check if we need to delay processing because of ALUA
+ * Active/NonOptimized primary access state..
+ */
+ core_alua_check_nonop_delay(SE_CMD(cmd));
+ /*
+ * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
+ * the Immediate Bit is not set, and no Immediate
+ * Data is attached.
+ *
+ * A PDU/CmdSN carrying Immediate Data can only
+ * be processed after the DataCRC has passed.
+ * If the DataCRC fails, the CmdSN MUST NOT
+ * be acknowledged. (See below)
+ */
+ if (!cmd->immediate_data) {
+ cmdsn_ret = iscsit_check_received_cmdsn(conn,
+ cmd, hdr->cmdsn);
+ if ((cmdsn_ret == CMDSN_NORMAL_OPERATION) ||
+ (cmdsn_ret == CMDSN_HIGHER_THAN_EXP))
+ do {} while (0);
+ else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
+ cmd->i_state = ISTATE_REMOVE;
+ iscsit_add_cmd_to_immediate_queue(cmd,
+ conn, cmd->i_state);
+ return 0;
+ } else { /* (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) */
+ return iscsit_add_reject_from_cmd(
+ ISCSI_REASON_PROTOCOL_ERROR,
+ 1, 0, buf, cmd);
+ }
+ }
+ iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
+
+ /*
+ * If no Immediate Data is attached, it's OK to return now.
+ */
+ if (!cmd->immediate_data) {
+ if (send_check_condition)
+ return 0;
+
+ if (cmd->unsolicited_data) {
+ iscsit_set_dataout_sequence_values(cmd);
+
+ spin_lock_bh(&cmd->dataout_timeout_lock);
+ iscsit_start_dataout_timer(cmd, cmd->conn);
+ spin_unlock_bh(&cmd->dataout_timeout_lock);
+ }
+
+ return 0;
+ }
+
+ /*
+ * Early CHECK_CONDITIONs never make it to the transport processing
+ * thread. They are processed in CmdSN order by
+ * iscsit_check_received_cmdsn() below.
+ */
+ if (send_check_condition) {
+ immed_ret = IMMEDIDATE_DATA_NORMAL_OPERATION;
+ dump_immediate_data = 1;
+ goto after_immediate_data;
+ }
+
+ /*
+ * Immediate Data is present, send to the transport and block until
+ * the underlying transport plugin has allocated the buffer to
+ * receive the Immediate Write Data into.
+ */
+ transport_generic_handle_cdb(SE_CMD(cmd));
+
+ wait_for_completion(&cmd->unsolicited_data_comp);
+
+ if (SE_CMD(cmd)->se_cmd_flags & SCF_SE_CMD_FAILED) {
+ immed_ret = IMMEDIDATE_DATA_NORMAL_OPERATION;
+ dump_immediate_data = 1;
+ goto after_immediate_data;
+ }
+
+ immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
+after_immediate_data:
+ if (immed_ret == IMMEDIDATE_DATA_NORMAL_OPERATION) {
+ /*
+ * A PDU/CmdSN carrying Immediate Data passed
+ * DataCRC, check against ExpCmdSN/MaxCmdSN if
+ * Immediate Bit is not set.
+ */
+ cmdsn_ret = iscsit_check_received_cmdsn(conn,
+ cmd, hdr->cmdsn);
+ /*
+ * Special case for Unsupported SAM WRITE Opcodes
+ * and ImmediateData=Yes.
+ */
+ if (dump_immediate_data) {
+ if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
+ return -1;
+ } else if (cmd->unsolicited_data) {
+ iscsit_set_dataout_sequence_values(cmd);
+
+ spin_lock_bh(&cmd->dataout_timeout_lock);
+ iscsit_start_dataout_timer(cmd, cmd->conn);
+ spin_unlock_bh(&cmd->dataout_timeout_lock);
+ }
+
+ if (cmdsn_ret == CMDSN_NORMAL_OPERATION)
+ return 0;
+ else if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
+ return 0;
+ else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
+ cmd->i_state = ISTATE_REMOVE;
+ iscsit_add_cmd_to_immediate_queue(cmd,
+ conn, cmd->i_state);
+ return 0;
+ } else { /* (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) */
+ return iscsit_add_reject_from_cmd(
+ ISCSI_REASON_PROTOCOL_ERROR,
+ 1, 0, buf, cmd);
+ }
+ } else if (immed_ret == IMMEDIDATE_DATA_ERL1_CRC_FAILURE) {
+ /*
+ * Immediate Data failed DataCRC and ERL>=1,
+ * silently drop this PDU and let the initiator
+ * plug the CmdSN gap.
+ *
+ * FIXME: Send Unsolicited NOPIN with reserved
+ * TTT here to help the initiator figure out
+ * the missing CmdSN, although they should be
+ * intelligent enough to determine the missing
+ * CmdSN and issue a retry to plug the sequence.
+ */
+ cmd->i_state = ISTATE_REMOVE;
+ iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
+ } else /* immed_ret == IMMEDIDATE_DATA_CANNOT_RECOVER */
+ return -1;
+
+ return 0;
+}
+
+static void iscsit_do_crypto_hash_iovec(
+ struct hash_desc *hash,
+ struct kvec *iov,
+ u32 counter,
+ u32 padding,
+ u8 *pad_bytes,
+ u8 *data_crc)
+{
+ struct scatterlist sg;
+ struct kvec *iov_ptr = iov;
+
+ crypto_hash_init(hash);
+
+ while (counter > 0) {
+ sg_init_one(&sg, iov_ptr->iov_base,
+ iov_ptr->iov_len);
+ crypto_hash_update(hash, &sg, iov_ptr->iov_len);
+
+ counter -= iov_ptr->iov_len;
+ iov_ptr++;
+ }
+
+ if (padding) {
+ sg_init_one(&sg, pad_bytes, padding);
+ crypto_hash_update(hash, &sg, padding);
+ }
+ crypto_hash_final(hash, data_crc);
+}
+
+static void iscsit_do_crypto_hash_buf(
+ struct hash_desc *hash,
+ unsigned char *buf,
+ u32 payload_length,
+ u32 padding,
+ u8 *pad_bytes,
+ u8 *data_crc)
+{
+ struct scatterlist sg;
+
+ crypto_hash_init(hash);
+
+ sg_init_one(&sg, (u8 *)buf, payload_length);
+ crypto_hash_update(hash, &sg, payload_length);
+
+ if (padding) {
+ sg_init_one(&sg, pad_bytes, padding);
+ crypto_hash_update(hash, &sg, padding);
+ }
+ crypto_hash_final(hash, data_crc);
+}
+
+static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
+{
+ int iov_ret, ooo_cmdsn = 0, ret;
+ u8 data_crc_failed = 0, *pad_bytes[4];
+ u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
+ u32 rx_size = 0, payload_length;
+ struct iscsi_cmd *cmd = NULL;
+ struct se_cmd *se_cmd;
+ struct se_map_sg map_sg;
+ struct se_unmap_sg unmap_sg;
+ struct iscsi_data *hdr;
+ struct kvec *iov;
+ unsigned long flags;
+
+ hdr = (struct iscsi_data *) buf;
+ payload_length = ntoh24(hdr->dlength);
+ hdr->itt = be32_to_cpu(hdr->itt);
+ hdr->ttt = be32_to_cpu(hdr->ttt);
+ hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
+ hdr->datasn = be32_to_cpu(hdr->datasn);
+ hdr->offset = be32_to_cpu(hdr->offset);
+
+ if (!payload_length) {
+ printk(KERN_ERR "DataOUT payload is ZERO, protocol error.\n");
+ return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
+ buf, conn);
+ }
+
+ /* iSCSI write */
+ spin_lock_bh(&conn->sess->session_stats_lock);
+ conn->sess->rx_data_octets += payload_length;
+ if (conn->sess->se_sess->se_node_acl) {
+ spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
+ conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
+ spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
+ }
+ spin_unlock_bh(&conn->sess->session_stats_lock);
+
+ if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
+ printk(KERN_ERR "DataSegmentLength: %u is greater than"
+ " MaxRecvDataSegmentLength: %u\n", payload_length,
+ conn->conn_ops->MaxRecvDataSegmentLength);
+ return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
+ buf, conn);
+ }
+
+ cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
+ payload_length);
+ if (!cmd)
+ return 0;
+
+ TRACE(TRACE_ISCSI, "Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
+ " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
+ hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
+ payload_length, conn->cid);
+
+ if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
+ printk(KERN_ERR "Command ITT: 0x%08x received DataOUT after"
+ " last DataOUT received, dumping payload\n",
+ cmd->init_task_tag);
+ return iscsit_dump_data_payload(conn, payload_length, 1);
+ }
+
+ if (cmd->data_direction != DMA_TO_DEVICE) {
+ printk(KERN_ERR "Command ITT: 0x%08x received DataOUT for a"
+ " NON-WRITE command.\n", cmd->init_task_tag);
+ return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
+ 1, 0, buf, cmd);
+ }
+ se_cmd = SE_CMD(cmd);
+ iscsit_mod_dataout_timer(cmd);
+
+ if ((hdr->offset + payload_length) > cmd->data_length) {
+ printk(KERN_ERR "DataOut Offset: %u, Length %u greater than"
+ " iSCSI Command EDTL %u, protocol error.\n",
+ hdr->offset, payload_length, cmd->data_length);
+ return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
+ 1, 0, buf, cmd);
+ }
+
+ if (cmd->unsolicited_data) {
+ int dump_unsolicited_data = 0, wait_for_transport = 0;
+
+ if (conn->sess->sess_ops->InitialR2T) {
+ printk(KERN_ERR "Received unexpected unsolicited data"
+ " while InitialR2T=Yes, protocol error.\n");
+ transport_send_check_condition_and_sense(SE_CMD(cmd),
+ TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
+ return -1;
+ }
+ /*
+ * Special case for dealing with Unsolicited DataOUT
+ * and Unsupported SAM WRITE Opcodes and SE resource allocation
+ * failures;
+ */
+ spin_lock_irqsave(&se_cmd->t_task->t_state_lock, flags);
+ /*
+ * Handle cases where we do or do not want to sleep on
+ * unsolicited_data_comp
+ *
+ * First, if TRANSPORT_WRITE_PENDING state has not been reached,
+ * we need assume we need to wait and sleep..
+ */
+ wait_for_transport =
+ (se_cmd->t_state != TRANSPORT_WRITE_PENDING);
+ /*
+ * For the ImmediateData=Yes cases, there will already be
+ * generic target memory allocated with the original
+ * ISCSI_OP_SCSI_CMD PDU, so do not sleep for that case.
+ *
+ * The last is a check for a delayed TASK_ABORTED status that
+ * means the data payload will be dropped because
+ * SCF_SE_CMD_FAILED has been set to indicate that an exception
+ * condition for this struct sse_cmd has occured in generic target
+ * code that requires us to drop payload.
+ */
+ wait_for_transport =
+ (se_cmd->t_state != TRANSPORT_WRITE_PENDING);
+ if ((cmd->immediate_data != 0) ||
+ (atomic_read(&se_cmd->t_task->t_transport_aborted) != 0))
+ wait_for_transport = 0;
+ spin_unlock_irqrestore(&se_cmd->t_task->t_state_lock, flags);
+
+ if (wait_for_transport)
+ wait_for_completion(&cmd->unsolicited_data_comp);
+
+ spin_lock_irqsave(&se_cmd->t_task->t_state_lock, flags);
+ if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
+ (se_cmd->se_cmd_flags & SCF_SE_CMD_FAILED))
+ dump_unsolicited_data = 1;
+ spin_unlock_irqrestore(&se_cmd->t_task->t_state_lock, flags);
+
+ if (dump_unsolicited_data) {
+ /*
+ * Check if a delayed TASK_ABORTED status needs to
+ * be sent now if the ISCSI_FLAG_CMD_FINAL has been
+ * received with the unsolicitied data out.
+ */
+ if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
+ iscsit_stop_dataout_timer(cmd);
+
+ transport_check_aborted_status(se_cmd,
+ (hdr->flags & ISCSI_FLAG_CMD_FINAL));
+ return iscsit_dump_data_payload(conn, payload_length, 1);
+ }
+ } else {
+ /*
+ * For the normal solicited data path:
+ *
+ * Check for a delayed TASK_ABORTED status and dump any
+ * incoming data out payload if one exists. Also, when the
+ * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
+ * data out sequence, we decrement outstanding_r2ts. Once
+ * outstanding_r2ts reaches zero, go ahead and send the delayed
+ * TASK_ABORTED status.
+ */
+ if (atomic_read(&se_cmd->t_task->t_transport_aborted) != 0) {
+ if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
+ if (--cmd->outstanding_r2ts < 1) {
+ iscsit_stop_dataout_timer(cmd);
+ transport_check_aborted_status(
+ se_cmd, 1);
+ }
+
+ return iscsit_dump_data_payload(conn, payload_length, 1);
+ }
+ }
+ /*
+ * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
+ * within-command recovery checks before receiving the payload.
+ */
+ ret = iscsit_check_pre_dataout(cmd, buf);
+ if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
+ return 0;
+ else if (ret == DATAOUT_CANNOT_RECOVER)
+ return -1;
+
+ rx_size += payload_length;
+ iov = &cmd->iov_data[0];
+
+ memset(&map_sg, 0, sizeof(struct se_map_sg));
+ memset(&unmap_sg, 0, sizeof(struct se_unmap_sg));
+ map_sg.fabric_cmd = (void *)cmd;
+ map_sg.se_cmd = SE_CMD(cmd);
+ map_sg.iov = iov;
+ map_sg.sg_kmap_active = 1;
+ map_sg.data_length = payload_length;
+ map_sg.data_offset = hdr->offset;
+ unmap_sg.fabric_cmd = (void *)cmd;
+ unmap_sg.se_cmd = SE_CMD(cmd);
+
+ iov_ret = iscsit_set_iovec_ptrs(&map_sg, &unmap_sg);
+ if (iov_ret < 0)
+ return -1;
+
+ iov_count += iov_ret;
+
+ padding = ((-payload_length) & 3);
+ if (padding != 0) {
+ iov[iov_count].iov_base = &pad_bytes;
+ iov[iov_count++].iov_len = padding;
+ rx_size += padding;
+ TRACE(TRACE_ISCSI, "Receiving %u padding bytes.\n", padding);
+ }
+
+ if (conn->conn_ops->DataDigest) {
+ iov[iov_count].iov_base = &checksum;
+ iov[iov_count++].iov_len = ISCSI_CRC_LEN;
+ rx_size += ISCSI_CRC_LEN;
+ }
+
+ iscsit_map_SG_segments(&unmap_sg);
+
+ rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
+
+ iscsit_unmap_SG_segments(&unmap_sg);
+
+ if (rx_got != rx_size)
+ return -1;
+
+ if (conn->conn_ops->DataDigest) {
+ u32 counter = payload_length, data_crc = 0;
+ struct kvec *iov_ptr = &cmd->iov_data[0];
+ /*
+ * Thanks to the IP stack shitting on passed iovecs, we have to
+ * call set_iovec_data_ptrs() again in order to have a iMD/PSCSI
+ * agnostic way of doing datadigests computations.
+ */
+ memset(&map_sg, 0, sizeof(struct se_map_sg));
+ map_sg.fabric_cmd = (void *)cmd;
+ map_sg.se_cmd = SE_CMD(cmd);
+ map_sg.iov = iov_ptr;
+ map_sg.data_length = payload_length;
+ map_sg.data_offset = hdr->offset;
+
+ if (iscsit_set_iovec_ptrs(&map_sg, &unmap_sg) < 0)
+ return -1;
+
+ iscsit_do_crypto_hash_iovec(&conn->conn_rx_hash,
+ iov_ptr, counter, padding,
+ (u8 *)&pad_bytes, (u8 *)&data_crc);
+
+ if (checksum != data_crc) {
+ printk(KERN_ERR "ITT: 0x%08x, Offset: %u, Length: %u,"
+ " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
+ " does not match computed 0x%08x\n",
+ hdr->itt, hdr->offset, payload_length,
+ hdr->datasn, checksum, data_crc);
+ data_crc_failed = 1;
+ } else {
+ TRACE(TRACE_DIGEST, "Got CRC32C DataDigest 0x%08x for"
+ " %u bytes of Data Out\n", checksum,
+ payload_length);
+ }
+ }
+ /*
+ * Increment post receive data and CRC values or perform
+ * within-command recovery.
+ */
+ ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
+ if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
+ return 0;
+ else if (ret == DATAOUT_SEND_R2T) {
+ iscsit_set_dataout_sequence_values(cmd);
+ iscsit_build_r2ts_for_cmd(cmd, conn, 0);
+ } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
+ /*
+ * Handle extra special case for out of order
+ * Unsolicited Data Out.
+ */
+ spin_lock_bh(&cmd->istate_lock);
+ ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
+ cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
+ cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
+ spin_unlock_bh(&cmd->istate_lock);
+
+ iscsit_stop_dataout_timer(cmd);
+ return (!ooo_cmdsn) ? transport_generic_handle_data(
+ SE_CMD(cmd)) : 0;
+ } else /* DATAOUT_CANNOT_RECOVER */
+ return -1;
+
+ return 0;
+}
+
+static int iscsit_handle_nop_out(
+ struct iscsi_conn *conn,
+ unsigned char *buf)
+{
+ unsigned char *ping_data = NULL;
+ int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
+ u32 checksum, data_crc, padding = 0, payload_length;
+ u64 lun;
+ struct iscsi_cmd *cmd = NULL;
+ struct kvec *iov = NULL;
+ struct iscsi_nopout *hdr;
+
+ hdr = (struct iscsi_nopout *) buf;
+ payload_length = ntoh24(hdr->dlength);
+ lun = get_unaligned_le64(&hdr->lun[0]);
+ hdr->itt = be32_to_cpu(hdr->itt);
+ hdr->ttt = be32_to_cpu(hdr->ttt);
+ hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
+ hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
+
+ if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
+ printk(KERN_ERR "NOPOUT ITT is reserved, but Immediate Bit is"
+ " not set, protocol error.\n");
+ return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
+ buf, conn);
+ }
+
+ if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
+ printk(KERN_ERR "NOPOUT Ping Data DataSegmentLength: %u is"
+ " greater than MaxRecvDataSegmentLength: %u, protocol"
+ " error.\n", payload_length,
+ conn->conn_ops->MaxRecvDataSegmentLength);
+ return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
+ buf, conn);
+ }
+
+ TRACE(TRACE_ISCSI, "Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
+ " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
+ (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
+ hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
+ payload_length);
+ /*
+ * This is not a response to a Unsolicited NopIN, which means
+ * it can either be a NOPOUT ping request (with a valid ITT),
+ * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
+ * Either way, make sure we allocate an struct iscsi_cmd, as both
+ * can contain ping data.
+ */
+ if (hdr->ttt == 0xFFFFFFFF) {
+ cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
+ if (!cmd)
+ return iscsit_add_reject(
+ ISCSI_REASON_BOOKMARK_NO_RESOURCES,
+ 1, buf, conn);
+
+ cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
+ cmd->i_state = ISTATE_SEND_NOPIN;
+ cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
+ 1 : 0);
+ conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
+ cmd->targ_xfer_tag = 0xFFFFFFFF;
+ cmd->cmd_sn = hdr->cmdsn;
+ cmd->exp_stat_sn = hdr->exp_statsn;
+ cmd->data_direction = DMA_NONE;
+ }
+
+ if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
+ rx_size = payload_length;
+ ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
+ if (!ping_data) {
+ printk(KERN_ERR "Unable to allocate memory for"
+ " NOPOUT ping data.\n");
+ ret = -1;
+ goto out;
+ }
+
+ iov = &cmd->iov_misc[0];
+ iov[niov].iov_base = ping_data;
+ iov[niov++].iov_len = payload_length;
+
+ padding = ((-payload_length) & 3);
+ if (padding != 0) {
+ TRACE(TRACE_ISCSI, "Receiving %u additional bytes"
+ " for padding.\n", padding);
+ iov[niov].iov_base = &cmd->pad_bytes;
+ iov[niov++].iov_len = padding;
+ rx_size += padding;
+ }
+ if (conn->conn_ops->DataDigest) {
+ iov[niov].iov_base = &checksum;
+ iov[niov++].iov_len = ISCSI_CRC_LEN;
+ rx_size += ISCSI_CRC_LEN;
+ }
+
+ rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
+ if (rx_got != rx_size) {
+ ret = -1;
+ goto out;
+ }
+
+ if (conn->conn_ops->DataDigest) {
+ iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
+ ping_data, payload_length,
+ padding, (u8 *)&cmd->pad_bytes,
+ (u8 *)&data_crc);
+
+ if (checksum != data_crc) {
+ printk(KERN_ERR "Ping data CRC32C DataDigest"
+ " 0x%08x does not match computed 0x%08x\n",
+ checksum, data_crc);
+ if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
+ printk(KERN_ERR "Unable to recover from"
+ " NOPOUT Ping DataCRC failure while in"
+ " ERL=0.\n");
+ ret = -1;
+ goto out;
+ } else {
+ /*
+ * Silently drop this PDU and let the
+ * initiator plug the CmdSN gap.
+ */
+ TRACE(TRACE_ERL1, "Dropping NOPOUT"
+ " Command CmdSN: 0x%08x due to"
+ " DataCRC error.\n", hdr->cmdsn);
+ ret = 0;
+ goto out;
+ }
+ } else {
+ TRACE(TRACE_DIGEST, "Got CRC32C DataDigest"
+ " 0x%08x for %u bytes of ping data.\n",
+ checksum, payload_length);
+ }
+ }
+
+ ping_data[payload_length] = '\0';
+ /*
+ * Attach ping data to struct iscsi_cmd->buf_ptr.
+ */
+ cmd->buf_ptr = (void *)ping_data;
+ cmd->buf_ptr_size = payload_length;
+
+ TRACE(TRACE_ISCSI, "Got %u bytes of NOPOUT ping"
+ " data.\n", payload_length);
+ TRACE(TRACE_ISCSI, "Ping Data: \"%s\"\n", ping_data);
+ }
+
+ if (hdr->itt != 0xFFFFFFFF) {
+ if (!cmd) {
+ printk(KERN_ERR "Checking CmdSN for NOPOUT,"
+ " but cmd is NULL!\n");
+ return -1;
+ }
+ /*
+ * Initiator is expecting a NopIN ping reply,
+ */
+ spin_lock_bh(&conn->cmd_lock);
+ list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
+ spin_unlock_bh(&conn->cmd_lock);
+
+ iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
+
+ if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
+ iscsit_add_cmd_to_response_queue(cmd, conn,
+ cmd->i_state);
+ return 0;
+ }
+
+ cmdsn_ret = iscsit_check_received_cmdsn(conn, cmd, hdr->cmdsn);
+ if ((cmdsn_ret == CMDSN_NORMAL_OPERATION) ||
+ (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)) {
+ return 0;
+ } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
+ cmd->i_state = ISTATE_REMOVE;
+ iscsit_add_cmd_to_immediate_queue(cmd, conn,
+ cmd->i_state);
+ ret = 0;
+ goto ping_out;
+ } else { /* (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) */
+ return iscsit_add_reject_from_cmd(
+ ISCSI_REASON_PROTOCOL_ERROR,
+ 1, 0, buf, cmd);
+ ret = -1;
+ goto ping_out;
+ }
+
+ return 0;
+ }
+
+ if (hdr->ttt != 0xFFFFFFFF) {
+ /*
+ * This was a response to a unsolicited NOPIN ping.
+ */
+ cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
+ if (!cmd)
+ return -1;
+
+ iscsit_stop_nopin_response_timer(conn);
+
+ cmd->i_state = ISTATE_REMOVE;
+ iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
+ iscsit_start_nopin_timer(conn);
+ } else {
+ /*
+ * Initiator is not expecting a NOPIN is response.
+ * Just ignore for now.
+ *
+ * iSCSI v19-91 10.18
+ * "A NOP-OUT may also be used to confirm a changed
+ * ExpStatSN if another PDU will not be available
+ * for a long time."
+ */
+ ret = 0;
+ goto out;
+ }
+
+ return 0;
+out:
+ if (cmd)
+ iscsit_release_cmd(cmd);
+ping_out:
+ kfree(ping_data);
+ return ret;
+}
+
+static int iscsit_handle_task_mgt_cmd(
+ struct iscsi_conn *conn,
+ unsigned char *buf)
+{
+ struct iscsi_cmd *cmd;
+ struct se_tmr_req *se_tmr;
+ struct iscsi_tmr_req *tmr_req;
+ struct iscsi_tm *hdr;
+ u32 payload_length;
+ int cmdsn_ret, out_of_order_cmdsn = 0, ret;
+ u8 function;
+
+ hdr = (struct iscsi_tm *) buf;
+ payload_length = ntoh24(hdr->dlength);
+ hdr->itt = be32_to_cpu(hdr->itt);
+ hdr->rtt = be32_to_cpu(hdr->rtt);
+ hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
+ hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
+ hdr->refcmdsn = be32_to_cpu(hdr->refcmdsn);
+ hdr->exp_datasn = be32_to_cpu(hdr->exp_datasn);
+ hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
+ function = hdr->flags;
+
+ TRACE(TRACE_ISCSI, "Got Task Management Request ITT: 0x%08x, CmdSN:"
+ " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
+ " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
+ hdr->rtt, hdr->refcmdsn, conn->cid);
+
+ if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
+ ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
+ (hdr->rtt != ISCSI_RESERVED_TAG))) {
+ printk(KERN_ERR "RefTaskTag should be set to 0xFFFFFFFF.\n");
+ hdr->rtt = ISCSI_RESERVED_TAG;
+ }
+
+ if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
+ !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
+ printk(KERN_ERR "Task Management Request TASK_REASSIGN not"
+ " issued as immediate command, bad iSCSI Initiator"
+ "implementation\n");
+ return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
+ buf, conn);
+ }
+ if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
+ (hdr->refcmdsn != ISCSI_RESERVED_TAG))
+ hdr->refcmdsn = ISCSI_RESERVED_TAG;
+
+ cmd = iscsit_allocate_se_cmd_for_tmr(conn, function);
+ if (!cmd)
+ return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
+ 1, buf, conn);
+
+ cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
+ cmd->i_state = ISTATE_SEND_TASKMGTRSP;
+ cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
+ cmd->init_task_tag = hdr->itt;
+ cmd->targ_xfer_tag = 0xFFFFFFFF;
+ cmd->cmd_sn = hdr->cmdsn;
+ cmd->exp_stat_sn = hdr->exp_statsn;
+ se_tmr = SE_CMD(cmd)->se_tmr_req;
+ tmr_req = cmd->tmr_req;
+ /*
+ * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
+ */
+ if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
+ ret = iscsit_get_lun_for_tmr(cmd,
+ get_unaligned_le64(&hdr->lun[0]));
+ if (ret < 0) {
+ SE_CMD(cmd)->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
+ goto attach;
+ }
+ }
+
+ switch (function) {
+ case ISCSI_TM_FUNC_ABORT_TASK:
+ se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
+ if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
+ SE_CMD(cmd)->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ goto attach;
+ }
+ break;
+ case ISCSI_TM_FUNC_ABORT_TASK_SET:
+ case ISCSI_TM_FUNC_CLEAR_ACA:
+ case ISCSI_TM_FUNC_CLEAR_TASK_SET:
+ case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
+ break;
+ case ISCSI_TM_FUNC_TARGET_WARM_RESET:
+ if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
+ SE_CMD(cmd)->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
+ goto attach;
+ }
+ break;
+ case ISCSI_TM_FUNC_TARGET_COLD_RESET:
+ if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
+ SE_CMD(cmd)->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
+ goto attach;
+ }
+ break;
+ case ISCSI_TM_FUNC_TASK_REASSIGN:
+ se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
+ /*
+ * Perform sanity checks on the ExpDataSN only if the
+ * TASK_REASSIGN was successful.
+ */
+ if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
+ break;
+
+ if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
+ return iscsit_add_reject_from_cmd(
+ ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
+ buf, cmd);
+ break;
+ default:
+ printk(KERN_ERR "Unknown TMR function: 0x%02x, protocol"
+ " error.\n", function);
+ SE_CMD(cmd)->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
+ goto attach;
+ }
+
+ if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
+ (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
+ se_tmr->call_transport = 1;
+attach:
+ spin_lock_bh(&conn->cmd_lock);
+ list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
+ spin_unlock_bh(&conn->cmd_lock);
+
+ if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
+ cmdsn_ret = iscsit_check_received_cmdsn(conn,
+ cmd, hdr->cmdsn);
+ if (cmdsn_ret == CMDSN_NORMAL_OPERATION)
+ do {} while (0);
+ else if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
+ out_of_order_cmdsn = 1;
+ else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
+ cmd->i_state = ISTATE_REMOVE;
+ iscsit_add_cmd_to_immediate_queue(cmd, conn,
+ cmd->i_state);
+ return 0;
+ } else { /* (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) */
+ return iscsit_add_reject_from_cmd(
+ ISCSI_REASON_PROTOCOL_ERROR,
+ 1, 0, buf, cmd);
+ }
+ }
+ iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
+
+ if (out_of_order_cmdsn)
+ return 0;
+ /*
+ * Found the referenced task, send to transport for processing.
+ */
+ if (se_tmr->call_transport)
+ return transport_generic_handle_tmr(SE_CMD(cmd));
+
+ /*
+ * Could not find the referenced LUN, task, or Task Management
+ * command not authorized or supported. Change state and
+ * let the tx_thread send the response.
+ *
+ * For connection recovery, this is also the default action for
+ * TMR TASK_REASSIGN.
+ */
+ iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
+ return 0;
+}
+
+/* #warning FIXME: Support Text Command parameters besides SendTargets */
+static int iscsit_handle_text_cmd(
+ struct iscsi_conn *conn,
+ unsigned char *buf)
+{
+ char *text_ptr, *text_in;
+ int cmdsn_ret, niov = 0, rx_got, rx_size;
+ u32 checksum = 0, data_crc = 0, payload_length;
+ u32 padding = 0, pad_bytes = 0, text_length = 0;
+ struct iscsi_cmd *cmd;
+ struct kvec iov[3];
+ struct iscsi_text *hdr;
+
+ hdr = (struct iscsi_text *) buf;
+ payload_length = ntoh24(hdr->dlength);
+ hdr->itt = be32_to_cpu(hdr->itt);
+ hdr->ttt = be32_to_cpu(hdr->ttt);
+ hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
+ hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
+
+ if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
+ printk(KERN_ERR "Unable to accept text parameter length: %u"
+ "greater than MaxRecvDataSegmentLength %u.\n",
+ payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
+ return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
+ buf, conn);
+ }
+
+ TRACE(TRACE_ISCSI, "Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
+ " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
+ hdr->exp_statsn, payload_length);
+
+ rx_size = text_length = payload_length;
+ if (text_length) {
+ text_in = kzalloc(text_length, GFP_KERNEL);
+ if (!text_in) {
+ printk(KERN_ERR "Unable to allocate memory for"
+ " incoming text parameters\n");
+ return -1;
+ }
+
+ memset(iov, 0, 3 * sizeof(struct kvec));
+ iov[niov].iov_base = text_in;
+ iov[niov++].iov_len = text_length;
+
+ padding = ((-payload_length) & 3);
+ if (padding != 0) {
+ iov[niov].iov_base = &pad_bytes;
+ iov[niov++].iov_len = padding;
+ rx_size += padding;
+ TRACE(TRACE_ISCSI, "Receiving %u additional bytes"
+ " for padding.\n", padding);
+ }
+ if (conn->conn_ops->DataDigest) {
+ iov[niov].iov_base = &checksum;
+ iov[niov++].iov_len = ISCSI_CRC_LEN;
+ rx_size += ISCSI_CRC_LEN;
+ }
+
+ rx_got = rx_data(conn, &iov[0], niov, rx_size);
+ if (rx_got != rx_size) {
+ kfree(text_in);
+ return -1;
+ }
+
+ if (conn->conn_ops->DataDigest) {
+ iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
+ text_in, text_length,
+ padding, (u8 *)&pad_bytes,
+ (u8 *)&data_crc);
+
+ if (checksum != data_crc) {
+ printk(KERN_ERR "Text data CRC32C DataDigest"
+ " 0x%08x does not match computed"
+ " 0x%08x\n", checksum, data_crc);
+ if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
+ printk(KERN_ERR "Unable to recover from"
+ " Text Data digest failure while in"
+ " ERL=0.\n");
+ kfree(text_in);
+ return -1;
+ } else {
+ /*
+ * Silently drop this PDU and let the
+ * initiator plug the CmdSN gap.
+ */
+ TRACE(TRACE_ERL1, "Dropping Text"
+ " Command CmdSN: 0x%08x due to"
+ " DataCRC error.\n", hdr->cmdsn);
+ kfree(text_in);
+ return 0;
+ }
+ } else {
+ TRACE(TRACE_DIGEST, "Got CRC32C DataDigest"
+ " 0x%08x for %u bytes of text data.\n",
+ checksum, text_length);
+ }
+ }
+ text_in[text_length - 1] = '\0';
+ TRACE(TRACE_ISCSI, "Successfully read %d bytes of text"
+ " data.\n", text_length);
+
+ if (strncmp("SendTargets", text_in, 11) != 0) {
+ printk(KERN_ERR "Received Text Data that is not"
+ " SendTargets, cannot continue.\n");
+ kfree(text_in);
+ return -1;
+ }
+ text_ptr = strchr(text_in, '=');
+ if (!text_ptr) {
+ printk(KERN_ERR "No \"=\" separator found in Text Data,"
+ " cannot continue.\n");
+ kfree(text_in);
+ return -1;
+ }
+ if (strncmp("=All", text_ptr, 4) != 0) {
+ printk(KERN_ERR "Unable to locate All value for"
+ " SendTargets key, cannot continue.\n");
+ kfree(text_in);
+ return -1;
+ }
+/*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
+ kfree(text_in);
+ }
+
+ cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
+ if (!cmd)
+ return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
+ 1, buf, conn);
+
+ cmd->iscsi_opcode = ISCSI_OP_TEXT;
+ cmd->i_state = ISTATE_SEND_TEXTRSP;
+ cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
+ conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
+ cmd->targ_xfer_tag = 0xFFFFFFFF;
+ cmd->cmd_sn = hdr->cmdsn;
+ cmd->exp_stat_sn = hdr->exp_statsn;
+ cmd->data_direction = DMA_NONE;
+
+ spin_lock_bh(&conn->cmd_lock);
+ list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
+ spin_unlock_bh(&conn->cmd_lock);
+
+ iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
+
+ if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
+ cmdsn_ret = iscsit_check_received_cmdsn(conn, cmd, hdr->cmdsn);
+ if ((cmdsn_ret == CMDSN_NORMAL_OPERATION) ||
+ (cmdsn_ret == CMDSN_HIGHER_THAN_EXP))
+ return 0;
+ else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
+ iscsit_add_cmd_to_immediate_queue(cmd, conn,
+ ISTATE_REMOVE);
+ return 0;
+ } else { /* (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) */
+ return iscsit_add_reject_from_cmd(
+ ISCSI_REASON_PROTOCOL_ERROR,
+ 1, 0, buf, cmd);
+ }
+
+ return 0;
+ }
+
+ return iscsit_execute_cmd(cmd, 0);
+}
+
+int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+ struct iscsi_conn *conn_p;
+ struct iscsi_session *sess = conn->sess;
+
+ TRACE(TRACE_ISCSI, "Received logout request CLOSESESSION on CID: %hu"
+ " for SID: %u.\n", conn->cid, conn->sess->sid);
+
+ atomic_set(&sess->session_logout, 1);
+ atomic_set(&conn->conn_logout_remove, 1);
+ conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
+
+ iscsit_inc_conn_usage_count(conn);
+ iscsit_inc_session_usage_count(sess);
+
+ spin_lock_bh(&sess->conn_lock);
+ list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
+ if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
+ continue;
+
+ TRACE(TRACE_STATE, "Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
+ conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
+ }
+ spin_unlock_bh(&sess->conn_lock);
+
+ iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
+
+ return 0;
+}
+
+int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+ struct iscsi_conn *l_conn;
+ struct iscsi_session *sess = conn->sess;
+
+ TRACE(TRACE_ISCSI, "Received logout request CLOSECONNECTION for CID:"
+ " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
+
+ /*
+ * A Logout Request with a CLOSECONNECTION reason code for a CID
+ * can arrive on a connection with a differing CID.
+ */
+ if (conn->cid == cmd->logout_cid) {
+ spin_lock_bh(&conn->state_lock);
+ TRACE(TRACE_STATE, "Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
+ conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
+
+ atomic_set(&conn->conn_logout_remove, 1);
+ conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
+ iscsit_inc_conn_usage_count(conn);
+
+ spin_unlock_bh(&conn->state_lock);
+ } else {
+ /*
+ * Handle all different cid CLOSECONNECTION requests in
+ * iscsit_logout_post_handler_diffcid() as to give enough
+ * time for any non immediate command's CmdSN to be
+ * acknowledged on the connection in question.
+ *
+ * Here we simply make sure the CID is still around.
+ */
+ l_conn = iscsit_get_conn_from_cid(sess,
+ cmd->logout_cid);
+ if (!l_conn) {
+ cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
+ iscsit_add_cmd_to_response_queue(cmd, conn,
+ cmd->i_state);
+ return 0;
+ }
+
+ iscsit_dec_conn_usage_count(l_conn);
+ }
+
+ iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
+
+ return 0;
+}
+
+int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+ struct iscsi_session *sess = conn->sess;
+
+ TRACE(TRACE_ERL2, "Received explicit REMOVECONNFORRECOVERY logout for"
+ " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
+
+ if (sess->sess_ops->ErrorRecoveryLevel != 2) {
+ printk(KERN_ERR "Received Logout Request REMOVECONNFORRECOVERY"
+ " while ERL!=2.\n");
+ cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
+ iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
+ return 0;
+ }
+
+ if (conn->cid == cmd->logout_cid) {
+ printk(KERN_ERR "Received Logout Request REMOVECONNFORRECOVERY"
+ " with CID: %hu on CID: %hu, implementation error.\n",
+ cmd->logout_cid, conn->cid);
+ cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
+ iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
+ return 0;
+ }
+
+ iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
+
+ return 0;
+}
+
+static int iscsit_handle_logout_cmd(
+ struct iscsi_conn *conn,
+ unsigned char *buf)
+{
+ int cmdsn_ret, logout_remove = 0;
+ u8 reason_code = 0;
+ struct iscsi_cmd *cmd;
+ struct iscsi_logout *hdr;
+ struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
+
+ hdr = (struct iscsi_logout *) buf;
+ reason_code = (hdr->flags & 0x7f);
+ hdr->itt = be32_to_cpu(hdr->itt);
+ hdr->cid = be16_to_cpu(hdr->cid);
+ hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
+ hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
+
+ if (tiqn) {
+ spin_lock(&tiqn->logout_stats.lock);
+ if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
+ tiqn->logout_stats.normal_logouts++;
+ else
+ tiqn->logout_stats.abnormal_logouts++;
+ spin_unlock(&tiqn->logout_stats.lock);
+ }
+
+ TRACE(TRACE_ISCSI, "Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
+ " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
+ hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
+ hdr->cid, conn->cid);
+
+ if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
+ printk(KERN_ERR "Received logout request on connection that"
+ " is not in logged in state, ignoring request.\n");
+ return 0;
+ }
+
+ cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
+ if (!cmd)
+ return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
+ buf, conn);
+
+ cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
+ cmd->i_state = ISTATE_SEND_LOGOUTRSP;
+ cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
+ conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
+ cmd->targ_xfer_tag = 0xFFFFFFFF;
+ cmd->cmd_sn = hdr->cmdsn;
+ cmd->exp_stat_sn = hdr->exp_statsn;
+ cmd->logout_cid = hdr->cid;
+ cmd->logout_reason = reason_code;
+ cmd->data_direction = DMA_NONE;
+
+ /*
+ * We need to sleep in these cases (by returning 1) until the Logout
+ * Response gets sent in the tx thread.
+ */
+ if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
+ ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
+ (hdr->cid == conn->cid)))
+ logout_remove = 1;
+
+ spin_lock_bh(&conn->cmd_lock);
+ list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
+ spin_unlock_bh(&conn->cmd_lock);
+
+ if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
+ iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
+
+ /*
+ * Non-Immediate Logout Commands are executed in CmdSN order..
+ */
+ if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
+ cmdsn_ret = iscsit_check_received_cmdsn(conn, cmd, hdr->cmdsn);
+ if ((cmdsn_ret == CMDSN_NORMAL_OPERATION) ||
+ (cmdsn_ret == CMDSN_HIGHER_THAN_EXP))
+ return logout_remove;
+ else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
+ cmd->i_state = ISTATE_REMOVE;
+ iscsit_add_cmd_to_immediate_queue(cmd, conn,
+ cmd->i_state);
+ return 0;
+ } else { /* (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) */
+ return iscsit_add_reject_from_cmd(
+ ISCSI_REASON_PROTOCOL_ERROR,
+ 1, 0, buf, cmd);
+ }
+ }
+ /*
+ * Immediate Logout Commands are executed, well, Immediately.
+ */
+ if (iscsit_execute_cmd(cmd, 0) < 0)
+ return -1;
+
+ return logout_remove;
+}
+
+static int iscsit_handle_snack(
+ struct iscsi_conn *conn,
+ unsigned char *buf)
+{
+ u32 debug_type, unpacked_lun;
+ u64 lun;
+ struct iscsi_snack *hdr;
+
+ hdr = (struct iscsi_snack *) buf;
+ hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
+ lun = get_unaligned_le64(&hdr->lun[0]);
+ unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
+ hdr->itt = be32_to_cpu(hdr->itt);
+ hdr->ttt = be32_to_cpu(hdr->ttt);
+ hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
+ hdr->begrun = be32_to_cpu(hdr->begrun);
+ hdr->runlength = be32_to_cpu(hdr->runlength);
+
+ debug_type = (hdr->flags & 0x02) ? TRACE_ISCSI : TRACE_ERL1;
+ TRACE(debug_type, "Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
+ " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
+ " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
+ hdr->begrun, hdr->runlength, conn->cid);
+
+ if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
+ printk(KERN_ERR "Initiator sent SNACK request while in"
+ " ErrorRecoveryLevel=0.\n");
+ return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
+ buf, conn);
+ }
+ /*
+ * SNACK_DATA and SNACK_R2T are both 0, so check which function to
+ * call from inside iscsi_send_recovery_datain_or_r2t().
+ */
+ switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
+ case 0:
+ return iscsit_handle_recovery_datain_or_r2t(conn, buf,
+ hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
+ return 0;
+ case ISCSI_FLAG_SNACK_TYPE_STATUS:
+ return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
+ hdr->begrun, hdr->runlength);
+ case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
+ return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
+ hdr->runlength);
+ case ISCSI_FLAG_SNACK_TYPE_RDATA:
+ /* FIXME: Support R-Data SNACK */
+ printk(KERN_ERR "R-Data SNACK Not Supported.\n");
+ return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
+ buf, conn);
+ default:
+ printk(KERN_ERR "Unknown SNACK type 0x%02x, protocol"
+ " error.\n", hdr->flags & 0x0f);
+ return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
+ buf, conn);
+ }
+
+ return 0;
+}
+
+static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
+{
+ if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
+ (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
+ wait_for_completion_interruptible_timeout(
+ &conn->rx_half_close_comp,
+ ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
+ }
+}
+
+static int iscsit_handle_immediate_data(
+ struct iscsi_cmd *cmd,
+ unsigned char *buf,
+ u32 length)
+{
+ int iov_ret, rx_got = 0, rx_size = 0;
+ u32 checksum, iov_count = 0, padding = 0, pad_bytes = 0;
+ struct iscsi_conn *conn = cmd->conn;
+ struct se_map_sg map_sg;
+ struct se_unmap_sg unmap_sg;
+ struct kvec *iov;
+
+ memset(&map_sg, 0, sizeof(struct se_map_sg));
+ memset(&unmap_sg, 0, sizeof(struct se_unmap_sg));
+ map_sg.fabric_cmd = (void *)cmd;
+ map_sg.se_cmd = SE_CMD(cmd);
+ map_sg.sg_kmap_active = 1;
+ map_sg.iov = &cmd->iov_data[0];
+ map_sg.data_length = length;
+ map_sg.data_offset = cmd->write_data_done;
+ unmap_sg.fabric_cmd = (void *)cmd;
+ unmap_sg.se_cmd = SE_CMD(cmd);
+
+ iov_ret = iscsit_set_iovec_ptrs(&map_sg, &unmap_sg);
+ if (iov_ret < 0)
+ return IMMEDIDATE_DATA_CANNOT_RECOVER;
+
+ rx_size = length;
+ iov_count = iov_ret;
+ iov = &cmd->iov_data[0];
+
+ padding = ((-length) & 3);
+ if (padding != 0) {
+ iov[iov_count].iov_base = &pad_bytes;
+ iov[iov_count++].iov_len = padding;
+ rx_size += padding;
+ }
+
+ if (conn->conn_ops->DataDigest) {
+ iov[iov_count].iov_base = &checksum;
+ iov[iov_count++].iov_len = ISCSI_CRC_LEN;
+ rx_size += ISCSI_CRC_LEN;
+ }
+
+ iscsit_map_SG_segments(&unmap_sg);
+
+ rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
+
+ iscsit_unmap_SG_segments(&unmap_sg);
+
+ if (rx_got != rx_size) {
+ iscsit_rx_thread_wait_for_tcp(conn);
+ return IMMEDIDATE_DATA_CANNOT_RECOVER;
+ }
+
+ if (conn->conn_ops->DataDigest) {
+ u32 counter = length, data_crc;
+ struct kvec *iov_ptr = &cmd->iov_data[0];
+ /*
+ * Thanks to the IP stack shitting on passed iovecs, we have to
+ * call set_iovec_data_ptrs again in order to have a iMD/PSCSI
+ * agnostic way of doing datadigests computations.
+ */
+ memset(&map_sg, 0, sizeof(struct se_map_sg));
+ map_sg.fabric_cmd = (void *)cmd;
+ map_sg.se_cmd = SE_CMD(cmd);
+ map_sg.iov = iov_ptr;
+ map_sg.data_length = length;
+ map_sg.data_offset = cmd->write_data_done;
+
+ if (iscsit_set_iovec_ptrs(&map_sg, &unmap_sg) < 0)
+ return IMMEDIDATE_DATA_CANNOT_RECOVER;
+
+ iscsit_do_crypto_hash_iovec(&conn->conn_rx_hash, iov_ptr,
+ counter, padding,
+ (u8 *)&pad_bytes, (u8 *)&data_crc);
+
+ if (checksum != data_crc) {
+ printk(KERN_ERR "ImmediateData CRC32C DataDigest 0x%08x"
+ " does not match computed 0x%08x\n", checksum,
+ data_crc);
+
+ if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
+ printk(KERN_ERR "Unable to recover from"
+ " Immediate Data digest failure while"
+ " in ERL=0.\n");
+ iscsit_add_reject_from_cmd(
+ ISCSI_REASON_DATA_DIGEST_ERROR,
+ 1, 0, buf, cmd);
+ return IMMEDIDATE_DATA_CANNOT_RECOVER;
+ } else {
+ iscsit_add_reject_from_cmd(
+ ISCSI_REASON_DATA_DIGEST_ERROR,
+ 0, 0, buf, cmd);
+ return IMMEDIDATE_DATA_ERL1_CRC_FAILURE;
+ }
+ } else {
+ TRACE(TRACE_DIGEST, "Got CRC32C DataDigest 0x%08x for"
+ " %u bytes of Immediate Data\n", checksum,
+ length);
+ }
+ }
+
+ cmd->write_data_done += length;
+
+ if (cmd->write_data_done == cmd->data_length) {
+ spin_lock_bh(&cmd->istate_lock);
+ cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
+ cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
+ spin_unlock_bh(&cmd->istate_lock);
+ }
+
+ return IMMEDIDATE_DATA_NORMAL_OPERATION;
+}
+
+int iscsit_send_async_msg(
+ struct iscsi_conn *conn,
+ u16 cid,
+ u8 async_event,
+ u8 async_vcode)
+{
+ u8 iscsi_hdr[ISCSI_HDR_LEN+ISCSI_CRC_LEN];
+ u32 tx_send = ISCSI_HDR_LEN, tx_sent = 0;
+ struct iscsi_async *hdr;
+ struct kvec iov;
+
+ memset(&iov, 0, sizeof(struct kvec));
+ memset(&iscsi_hdr, 0, ISCSI_HDR_LEN+ISCSI_CRC_LEN);
+
+ hdr = (struct iscsi_async *)&iscsi_hdr;
+ hdr->opcode = ISCSI_OP_ASYNC_EVENT;
+ hdr->flags |= ISCSI_FLAG_CMD_FINAL;
+ hton24(hdr->dlength, 0);
+ put_unaligned_le64(0, &hdr->lun[0]);
+ put_unaligned_be64(0xffffffffffffffff, &hdr->rsvd4[0]);
+ hdr->statsn = cpu_to_be32(conn->stat_sn++);
+ spin_lock(&conn->sess->cmdsn_lock);
+ hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
+ hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
+ spin_unlock(&conn->sess->cmdsn_lock);
+ hdr->async_event = async_event;
+ hdr->async_vcode = async_vcode;
+
+ switch (async_event) {
+ case ISCSI_ASYNC_MSG_SCSI_EVENT:
+ printk(KERN_ERR "ISCSI_ASYNC_MSG_SCSI_EVENT: not supported yet.\n");
+ return -1;
+ case ISCSI_ASYNC_MSG_REQUEST_LOGOUT:
+ TRACE(TRACE_STATE, "Moving to"
+ " TARG_CONN_STATE_LOGOUT_REQUESTED.\n");
+ conn->conn_state = TARG_CONN_STATE_LOGOUT_REQUESTED;
+ hdr->param1 = 0;
+ hdr->param2 = 0;
+ hdr->param3 = cpu_to_be16(SECONDS_FOR_ASYNC_LOGOUT);
+ break;
+ case ISCSI_ASYNC_MSG_DROPPING_CONNECTION:
+ hdr->param1 = cpu_to_be16(cid);
+ hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
+ hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
+ break;
+ case ISCSI_ASYNC_MSG_DROPPING_ALL_CONNECTIONS:
+ hdr->param1 = 0;
+ hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
+ hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
+ break;
+ case ISCSI_ASYNC_MSG_PARAM_NEGOTIATION:
+ hdr->param1 = 0;
+ hdr->param2 = 0;
+ hdr->param3 = cpu_to_be16(SECONDS_FOR_ASYNC_TEXT);
+ break;
+ case ISCSI_ASYNC_MSG_VENDOR_SPECIFIC:
+ printk(KERN_ERR "ISCSI_ASYNC_MSG_VENDOR_SPECIFIC not"
+ " supported yet.\n");
+ return -1;
+ default:
+ printk(KERN_ERR "Unknown AsycnEvent 0x%02x, protocol"
+ " error.\n", async_event);
+ return -1;
+ }
+
+ iov.iov_base = &iscsi_hdr;
+ iov.iov_len = ISCSI_HDR_LEN;
+
+ if (conn->conn_ops->HeaderDigest) {
+ u32 *header_digest = (u32 *)&iscsi_hdr[ISCSI_HDR_LEN];
+
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
+ (unsigned char *)&iscsi_hdr, ISCSI_HDR_LEN,
+ 0, NULL, (u8 *)header_digest);
+
+ iov.iov_len += ISCSI_CRC_LEN;
+ tx_send += ISCSI_CRC_LEN;
+ TRACE(TRACE_DIGEST, "Attaching CRC32 HeaderDigest for Async"
+ " Msg PDU 0x%08x\n", *header_digest);
+ }
+
+ TRACE(TRACE_ISCSI, "Built Async Message StatSN: 0x%08x, AsyncEvent:"
+ " 0x%02x, P1: 0x%04x, P2: 0x%04x, P3: 0x%04x\n",
+ ntohl(hdr->statsn), hdr->async_event, ntohs(hdr->param1),
+ ntohs(hdr->param2), ntohs(hdr->param3));
+
+ tx_sent = tx_data(conn, &iov, 1, tx_send);
+ if (tx_sent != tx_send) {
+ printk(KERN_ERR "tx_data returned %d expecting %d\n",
+ tx_sent, tx_send);
+ return -1;
+ }
+
+ if (async_event == ISCSI_ASYNC_MSG_REQUEST_LOGOUT) {
+ wait_for_completion_timeout(&conn->sess->async_msg_comp,
+ SECONDS_FOR_ASYNC_LOGOUT * HZ);
+
+ if (conn->conn_state == TARG_CONN_STATE_LOGOUT_REQUESTED) {
+ printk(KERN_ERR "Asynchronous message timer expired"
+ " without receiving a logout request, dropping"
+ " iSCSI session.\n");
+ iscsit_send_async_msg(conn, 0,
+ ISCSI_ASYNC_MSG_DROPPING_ALL_CONNECTIONS, 0);
+ iscsit_free_session(conn->sess);
+ }
+ }
+ return 0;
+}
+
+/*
+ * Called with sess->conn_lock held.
+ */
+/* #warning iscsi_build_conn_drop_async_message() only sends out on connections
+ with active network interface */
+static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
+{
+ struct iscsi_cmd *cmd;
+ struct iscsi_conn *conn_p;
+
+ /*
+ * Only send a Asynchronous Message on connections whos network
+ * interface is still functional.
+ */
+ list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
+ if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
+ iscsit_inc_conn_usage_count(conn_p);
+ break;
+ }
+ }
+
+ if (!conn_p)
+ return;
+
+ cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
+ if (!cmd) {
+ iscsit_dec_conn_usage_count(conn_p);
+ return;
+ }
+
+ cmd->logout_cid = conn->cid;
+ cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
+ cmd->i_state = ISTATE_SEND_ASYNCMSG;
+
+ spin_lock_bh(&conn_p->cmd_lock);
+ list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list);
+ spin_unlock_bh(&conn_p->cmd_lock);
+
+ iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
+ iscsit_dec_conn_usage_count(conn_p);
+}
+
+static int iscsit_send_conn_drop_async_message(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn)
+{
+ struct iscsi_async *hdr;
+
+ cmd->tx_size = ISCSI_HDR_LEN;
+ cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
+
+ hdr = (struct iscsi_async *) cmd->pdu;
+ hdr->opcode = ISCSI_OP_ASYNC_EVENT;
+ hdr->flags = ISCSI_FLAG_CMD_FINAL;
+ cmd->init_task_tag = 0xFFFFFFFF;
+ cmd->targ_xfer_tag = 0xFFFFFFFF;
+ put_unaligned_be64(0xffffffffffffffff, &hdr->rsvd4[0]);
+ cmd->stat_sn = conn->stat_sn++;
+ hdr->statsn = cpu_to_be32(cmd->stat_sn);
+ hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
+ hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
+ hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
+ hdr->param1 = cpu_to_be16(cmd->logout_cid);
+ hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
+ hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
+
+ if (conn->conn_ops->HeaderDigest) {
+ u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
+
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
+ (unsigned char *)hdr, ISCSI_HDR_LEN,
+ 0, NULL, (u8 *)header_digest);
+
+ cmd->tx_size += ISCSI_CRC_LEN;
+ TRACE(TRACE_DIGEST, "Attaching CRC32C HeaderDigest to"
+ " Async Message 0x%08x\n", *header_digest);
+ }
+
+ cmd->iov_misc[0].iov_base = cmd->pdu;
+ cmd->iov_misc[0].iov_len = cmd->tx_size;
+ cmd->iov_misc_count = 1;
+
+ TRACE(TRACE_ERL2, "Sending Connection Dropped Async Message StatSN:"
+ " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
+ cmd->logout_cid, conn->cid);
+ return 0;
+}
+
+static int iscsit_send_data_in(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn,
+ struct se_unmap_sg *unmap_sg,
+ int *eodr)
+{
+ int iov_ret = 0, set_statsn = 0;
+ u8 *pad_bytes;
+ u32 iov_count = 0, tx_size = 0;
+ struct iscsi_datain datain;
+ struct iscsi_datain_req *dr;
+ struct se_map_sg map_sg;
+ struct iscsi_data_rsp *hdr;
+ struct kvec *iov;
+
+ memset(&datain, 0, sizeof(struct iscsi_datain));
+ dr = iscsit_get_datain_values(cmd, &datain);
+ if (!dr) {
+ printk(KERN_ERR "iscsit_get_datain_values failed for ITT: 0x%08x\n",
+ cmd->init_task_tag);
+ return -1;
+ }
+
+ /*
+ * Be paranoid and double check the logic for now.
+ */
+ if ((datain.offset + datain.length) > cmd->data_length) {
+ printk(KERN_ERR "Command ITT: 0x%08x, datain.offset: %u and"
+ " datain.length: %u exceeds cmd->data_length: %u\n",
+ cmd->init_task_tag, datain.offset, datain.length,
+ cmd->data_length);
+ return -1;
+ }
+
+ spin_lock_bh(&conn->sess->session_stats_lock);
+ conn->sess->tx_data_octets += datain.length;
+ if (conn->sess->se_sess->se_node_acl) {
+ spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
+ conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
+ spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
+ }
+ spin_unlock_bh(&conn->sess->session_stats_lock);
+ /*
+ * Special case for successfully execution w/ both DATAIN
+ * and Sense Data.
+ */
+ if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
+ (SE_CMD(cmd)->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
+ datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
+ else {
+ if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
+ (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
+ iscsit_increment_maxcmdsn(cmd, conn->sess);
+ cmd->stat_sn = conn->stat_sn++;
+ set_statsn = 1;
+ } else if (dr->dr_complete ==
+ DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
+ set_statsn = 1;
+ }
+
+ hdr = (struct iscsi_data_rsp *) cmd->pdu;
+ memset(hdr, 0, ISCSI_HDR_LEN);
+ hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
+ hdr->flags = datain.flags;
+ if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
+ if (SE_CMD(cmd)->se_cmd_flags & SCF_OVERFLOW_BIT) {
+ hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
+ hdr->residual_count = cpu_to_be32(cmd->residual_count);
+ } else if (SE_CMD(cmd)->se_cmd_flags & SCF_UNDERFLOW_BIT) {
+ hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
+ hdr->residual_count = cpu_to_be32(cmd->residual_count);
+ }
+ }
+ hton24(hdr->dlength, datain.length);
+ if (hdr->flags & ISCSI_FLAG_DATA_ACK)
+ int_to_scsilun(SE_CMD(cmd)->orig_fe_lun,
+ (struct scsi_lun *)&hdr->lun[0]);
+ else
+ put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun[0]);
+
+ hdr->itt = cpu_to_be32(cmd->init_task_tag);
+ hdr->ttt = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
+ cpu_to_be32(cmd->targ_xfer_tag) :
+ 0xFFFFFFFF;
+ hdr->statsn = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
+ 0xFFFFFFFF;
+ hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
+ hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
+ hdr->datasn = cpu_to_be32(datain.data_sn);
+ hdr->offset = cpu_to_be32(datain.offset);
+
+ iov = &cmd->iov_data[0];
+ iov[iov_count].iov_base = cmd->pdu;
+ iov[iov_count++].iov_len = ISCSI_HDR_LEN;
+ tx_size += ISCSI_HDR_LEN;
+
+ if (conn->conn_ops->HeaderDigest) {
+ u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
+
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
+ (unsigned char *)hdr, ISCSI_HDR_LEN,
+ 0, NULL, (u8 *)header_digest);
+
+ iov[0].iov_len += ISCSI_CRC_LEN;
+ tx_size += ISCSI_CRC_LEN;
+
+ TRACE(TRACE_DIGEST, "Attaching CRC32 HeaderDigest"
+ " for DataIN PDU 0x%08x\n", *header_digest);
+ }
+
+ memset(&map_sg, 0, sizeof(struct se_map_sg));
+ map_sg.fabric_cmd = (void *)cmd;
+ map_sg.se_cmd = SE_CMD(cmd);
+ map_sg.sg_kmap_active = 1;
+ map_sg.iov = &cmd->iov_data[1];
+ map_sg.data_length = datain.length;
+ map_sg.data_offset = datain.offset;
+
+ iov_ret = iscsit_set_iovec_ptrs(&map_sg, unmap_sg);
+ if (iov_ret < 0)
+ return -1;
+
+ iov_count += iov_ret;
+ tx_size += datain.length;
+
+ unmap_sg->padding = ((-datain.length) & 3);
+ if (unmap_sg->padding != 0) {
+ pad_bytes = kzalloc(unmap_sg->padding * sizeof(u8),
+ GFP_KERNEL);
+ if (!pad_bytes) {
+ printk(KERN_ERR "Unable to allocate memory for"
+ " pad_bytes.\n");
+ return -1;
+ }
+ cmd->buf_ptr = pad_bytes;
+ iov[iov_count].iov_base = pad_bytes;
+ iov[iov_count++].iov_len = unmap_sg->padding;
+ tx_size += unmap_sg->padding;
+
+ TRACE(TRACE_ISCSI, "Attaching %u padding bytes\n",
+ unmap_sg->padding);
+ }
+ if (conn->conn_ops->DataDigest) {
+ u32 counter = (datain.length + unmap_sg->padding);
+ struct kvec *iov_ptr = &cmd->iov_data[1];
+
+ iscsit_do_crypto_hash_iovec(&conn->conn_tx_hash, iov_ptr,
+ counter, 0, NULL, (u8 *)&cmd->data_crc);
+
+ iov[iov_count].iov_base = &cmd->data_crc;
+ iov[iov_count++].iov_len = ISCSI_CRC_LEN;
+ tx_size += ISCSI_CRC_LEN;
+
+ TRACE(TRACE_DIGEST, "Attached CRC32C DataDigest %d bytes, crc"
+ " 0x%08x\n", datain.length+unmap_sg->padding,
+ cmd->data_crc);
+ }
+
+ cmd->iov_data_count = iov_count;
+ cmd->tx_size = tx_size;
+
+ TRACE(TRACE_ISCSI, "Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
+ " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
+ cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
+ ntohl(hdr->offset), datain.length, conn->cid);
+
+ if (dr->dr_complete) {
+ *eodr = (SE_CMD(cmd)->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
+ 2 : 1;
+ iscsit_free_datain_req(cmd, dr);
+ }
+
+ return 0;
+}
+
+static int iscsit_send_logout_response(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn)
+{
+ int niov = 0, tx_size;
+ struct iscsi_conn *logout_conn = NULL;
+ struct iscsi_conn_recovery *cr = NULL;
+ struct iscsi_session *sess = conn->sess;
+ struct kvec *iov;
+ struct iscsi_logout_rsp *hdr;
+ /*
+ * The actual shutting down of Sessions and/or Connections
+ * for CLOSESESSION and CLOSECONNECTION Logout Requests
+ * is done in scsi_logout_post_handler().
+ */
+ switch (cmd->logout_reason) {
+ case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
+ TRACE(TRACE_ISCSI, "iSCSI session logout successful, setting"
+ " logout response to ISCSI_LOGOUT_SUCCESS.\n");
+ cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
+ break;
+ case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
+ if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
+ break;
+ /*
+ * For CLOSECONNECTION logout requests carrying
+ * a matching logout CID -> local CID, the reference
+ * for the local CID will have been incremented in
+ * iscsi_logout_closeconnection().
+ *
+ * For CLOSECONNECTION logout requests carrying
+ * a different CID than the connection it arrived
+ * on, the connection responding to cmd->logout_cid
+ * is stopped in iscsit_logout_post_handler_diffcid().
+ */
+
+ TRACE(TRACE_ISCSI, "iSCSI CID: %hu logout on CID: %hu"
+ " successful.\n", cmd->logout_cid, conn->cid);
+ cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
+ break;
+ case ISCSI_LOGOUT_REASON_RECOVERY:
+ if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
+ (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
+ break;
+ /*
+ * If the connection is still active from our point of view
+ * force connection recovery to occur.
+ */
+ logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
+ cmd->logout_cid);
+ if ((logout_conn)) {
+ iscsit_connection_reinstatement_rcfr(logout_conn);
+ iscsit_dec_conn_usage_count(logout_conn);
+ }
+
+ cr = iscsit_get_inactive_connection_recovery_entry(
+ conn->sess, cmd->logout_cid);
+ if (!cr) {
+ printk(KERN_ERR "Unable to locate CID: %hu for"
+ " REMOVECONNFORRECOVERY Logout Request.\n",
+ cmd->logout_cid);
+ cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
+ break;
+ }
+
+ iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
+
+ TRACE(TRACE_ERL2, "iSCSI REMOVECONNFORRECOVERY logout"
+ " for recovery for CID: %hu on CID: %hu successful.\n",
+ cmd->logout_cid, conn->cid);
+ cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
+ break;
+ default:
+ printk(KERN_ERR "Unknown cmd->logout_reason: 0x%02x\n",
+ cmd->logout_reason);
+ return -1;
+ }
+
+ tx_size = ISCSI_HDR_LEN;
+ hdr = (struct iscsi_logout_rsp *)cmd->pdu;
+ memset(hdr, 0, ISCSI_HDR_LEN);
+ hdr->opcode = ISCSI_OP_LOGOUT_RSP;
+ hdr->flags |= ISCSI_FLAG_CMD_FINAL;
+ hdr->response = cmd->logout_response;
+ hdr->itt = cpu_to_be32(cmd->init_task_tag);
+ cmd->stat_sn = conn->stat_sn++;
+ hdr->statsn = cpu_to_be32(cmd->stat_sn);
+
+ iscsit_increment_maxcmdsn(cmd, conn->sess);
+ hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
+ hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
+
+ iov = &cmd->iov_misc[0];
+ iov[niov].iov_base = cmd->pdu;
+ iov[niov++].iov_len = ISCSI_HDR_LEN;
+
+ if (conn->conn_ops->HeaderDigest) {
+ u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
+
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
+ (unsigned char *)hdr, ISCSI_HDR_LEN,
+ 0, NULL, (u8 *)header_digest);
+
+ iov[0].iov_len += ISCSI_CRC_LEN;
+ tx_size += ISCSI_CRC_LEN;
+ TRACE(TRACE_DIGEST, "Attaching CRC32C HeaderDigest to"
+ " Logout Response 0x%08x\n", *header_digest);
+ }
+ cmd->iov_misc_count = niov;
+ cmd->tx_size = tx_size;
+
+ TRACE(TRACE_ISCSI, "Sending Logout Response ITT: 0x%08x StatSN:"
+ " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
+ cmd->init_task_tag, cmd->stat_sn, hdr->response,
+ cmd->logout_cid, conn->cid);
+
+ return 0;
+}
+
+/*
+ * Unsolicited NOPIN, either requesting a response or not.
+ */
+static int iscsit_send_unsolicited_nopin(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn,
+ int want_response)
+{
+ int tx_size = ISCSI_HDR_LEN;
+ struct iscsi_nopin *hdr;
+
+ hdr = (struct iscsi_nopin *) cmd->pdu;
+ memset(hdr, 0, ISCSI_HDR_LEN);
+ hdr->opcode = ISCSI_OP_NOOP_IN;
+ hdr->flags |= ISCSI_FLAG_CMD_FINAL;
+ hdr->itt = cpu_to_be32(cmd->init_task_tag);
+ hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
+ cmd->stat_sn = conn->stat_sn;
+ hdr->statsn = cpu_to_be32(cmd->stat_sn);
+ hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
+ hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
+
+ if (conn->conn_ops->HeaderDigest) {
+ u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
+
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
+ (unsigned char *)hdr, ISCSI_HDR_LEN,
+ 0, NULL, (u8 *)header_digest);
+
+ tx_size += ISCSI_CRC_LEN;
+ TRACE(TRACE_DIGEST, "Attaching CRC32C HeaderDigest to"
+ " NopIN 0x%08x\n", *header_digest);
+ }
+
+ cmd->iov_misc[0].iov_base = cmd->pdu;
+ cmd->iov_misc[0].iov_len = tx_size;
+ cmd->iov_misc_count = 1;
+ cmd->tx_size = tx_size;
+
+ TRACE(TRACE_ISCSI, "Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
+ " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
+
+ return 0;
+}
+
+static int iscsit_send_nopin_response(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn)
+{
+ int niov = 0, tx_size;
+ u32 padding = 0;
+ struct kvec *iov;
+ struct iscsi_nopin *hdr;
+
+ tx_size = ISCSI_HDR_LEN;
+ hdr = (struct iscsi_nopin *) cmd->pdu;
+ memset(hdr, 0, ISCSI_HDR_LEN);
+ hdr->opcode = ISCSI_OP_NOOP_IN;
+ hdr->flags |= ISCSI_FLAG_CMD_FINAL;
+ hton24(hdr->dlength, cmd->buf_ptr_size);
+ put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun[0]);
+ hdr->itt = cpu_to_be32(cmd->init_task_tag);
+ hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
+ cmd->stat_sn = conn->stat_sn++;
+ hdr->statsn = cpu_to_be32(cmd->stat_sn);
+
+ iscsit_increment_maxcmdsn(cmd, conn->sess);
+ hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
+ hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
+
+ iov = &cmd->iov_misc[0];
+ iov[niov].iov_base = cmd->pdu;
+ iov[niov++].iov_len = ISCSI_HDR_LEN;
+
+ if (conn->conn_ops->HeaderDigest) {
+ u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
+
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
+ (unsigned char *)hdr, ISCSI_HDR_LEN,
+ 0, NULL, (u8 *)header_digest);
+
+ iov[0].iov_len += ISCSI_CRC_LEN;
+ tx_size += ISCSI_CRC_LEN;
+ TRACE(TRACE_DIGEST, "Attaching CRC32C HeaderDigest"
+ " to NopIn 0x%08x\n", *header_digest);
+ }
+
+ /*
+ * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
+ * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
+ */
+ if (cmd->buf_ptr_size) {
+ iov[niov].iov_base = cmd->buf_ptr;
+ iov[niov++].iov_len = cmd->buf_ptr_size;
+ tx_size += cmd->buf_ptr_size;
+
+ TRACE(TRACE_ISCSI, "Echoing back %u bytes of ping"
+ " data.\n", cmd->buf_ptr_size);
+
+ padding = ((-cmd->buf_ptr_size) & 3);
+ if (padding != 0) {
+ iov[niov].iov_base = &cmd->pad_bytes;
+ iov[niov++].iov_len = padding;
+ tx_size += padding;
+ TRACE(TRACE_ISCSI, "Attaching %u additional"
+ " padding bytes.\n", padding);
+ }
+ if (conn->conn_ops->DataDigest) {
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
+ cmd->buf_ptr, cmd->buf_ptr_size,
+ padding, (u8 *)&cmd->pad_bytes,
+ (u8 *)&cmd->data_crc);
+
+ iov[niov].iov_base = &cmd->data_crc;
+ iov[niov++].iov_len = ISCSI_CRC_LEN;
+ tx_size += ISCSI_CRC_LEN;
+ TRACE(TRACE_DIGEST, "Attached DataDigest for %u"
+ " bytes of ping data, CRC 0x%08x\n",
+ cmd->buf_ptr_size, cmd->data_crc);
+ }
+ }
+
+ cmd->iov_misc_count = niov;
+ cmd->tx_size = tx_size;
+
+ TRACE(TRACE_ISCSI, "Sending NOPIN Response ITT: 0x%08x, TTT:"
+ " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
+ cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
+
+ return 0;
+}
+
+int iscsit_send_r2t(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn)
+{
+ int tx_size = 0;
+ u32 trace_type;
+ struct iscsi_r2t *r2t;
+ struct iscsi_r2t_rsp *hdr;
+
+ r2t = iscsit_get_r2t_from_list(cmd);
+ if (!r2t)
+ return -1;
+
+ hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
+ memset(hdr, 0, ISCSI_HDR_LEN);
+ hdr->opcode = ISCSI_OP_R2T;
+ hdr->flags |= ISCSI_FLAG_CMD_FINAL;
+ int_to_scsilun(SE_CMD(cmd)->orig_fe_lun,
+ (struct scsi_lun *)&hdr->lun[0]);
+ hdr->itt = cpu_to_be32(cmd->init_task_tag);
+ spin_lock_bh(&conn->sess->ttt_lock);
+ r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
+ if (r2t->targ_xfer_tag == 0xFFFFFFFF)
+ r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
+ spin_unlock_bh(&conn->sess->ttt_lock);
+ hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
+ hdr->statsn = cpu_to_be32(conn->stat_sn);
+ hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
+ hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
+ hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
+ hdr->data_offset = cpu_to_be32(r2t->offset);
+ hdr->data_length = cpu_to_be32(r2t->xfer_len);
+
+ cmd->iov_misc[0].iov_base = cmd->pdu;
+ cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
+ tx_size += ISCSI_HDR_LEN;
+
+ if (conn->conn_ops->HeaderDigest) {
+ u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
+
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
+ (unsigned char *)hdr, ISCSI_HDR_LEN,
+ 0, NULL, (u8 *)header_digest);
+
+ cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
+ tx_size += ISCSI_CRC_LEN;
+ TRACE(TRACE_DIGEST, "Attaching CRC32 HeaderDigest for R2T"
+ " PDU 0x%08x\n", *header_digest);
+ }
+
+ trace_type = (!r2t->recovery_r2t) ? TRACE_ISCSI : TRACE_ERL1;
+ TRACE(trace_type, "Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
+ " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
+ (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
+ r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
+ r2t->offset, r2t->xfer_len, conn->cid);
+
+ cmd->iov_misc_count = 1;
+ cmd->tx_size = tx_size;
+
+ spin_lock_bh(&cmd->r2t_lock);
+ r2t->sent_r2t = 1;
+ spin_unlock_bh(&cmd->r2t_lock);
+
+ return 0;
+}
+
+/*
+ * type 0: Normal Operation.
+ * type 1: Called from Storage Transport.
+ * type 2: Called from iscsi_task_reassign_complete_write() for
+ * connection recovery.
+ */
+int iscsit_build_r2ts_for_cmd(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn,
+ int type)
+{
+ int first_r2t = 1;
+ u32 offset = 0, xfer_len = 0;
+
+ spin_lock_bh(&cmd->r2t_lock);
+ if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
+ spin_unlock_bh(&cmd->r2t_lock);
+ return 0;
+ }
+
+ if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2))
+ if (cmd->r2t_offset < cmd->write_data_done)
+ cmd->r2t_offset = cmd->write_data_done;
+
+ while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
+ if (conn->sess->sess_ops->DataSequenceInOrder) {
+ offset = cmd->r2t_offset;
+
+ if (first_r2t && (type == 2)) {
+ xfer_len = ((offset +
+ (conn->sess->sess_ops->MaxBurstLength -
+ cmd->next_burst_len) >
+ cmd->data_length) ?
+ (cmd->data_length - offset) :
+ (conn->sess->sess_ops->MaxBurstLength -
+ cmd->next_burst_len));
+ } else {
+ xfer_len = ((offset +
+ conn->sess->sess_ops->MaxBurstLength) >
+ cmd->data_length) ?
+ (cmd->data_length - offset) :
+ conn->sess->sess_ops->MaxBurstLength;
+ }
+ cmd->r2t_offset += xfer_len;
+
+ if (cmd->r2t_offset == cmd->data_length)
+ cmd->cmd_flags |= ICF_SENT_LAST_R2T;
+ } else {
+ struct iscsi_seq *seq;
+
+ seq = iscsit_get_seq_holder_for_r2t(cmd);
+ if (!seq) {
+ spin_unlock_bh(&cmd->r2t_lock);
+ return -1;
+ }
+
+ offset = seq->offset;
+ xfer_len = seq->xfer_len;
+
+ if (cmd->seq_send_order == cmd->seq_count)
+ cmd->cmd_flags |= ICF_SENT_LAST_R2T;
+ }
+ cmd->outstanding_r2ts++;
+ first_r2t = 0;
+
+ if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
+ spin_unlock_bh(&cmd->r2t_lock);
+ return -1;
+ }
+
+ if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
+ break;
+ }
+ spin_unlock_bh(&cmd->r2t_lock);
+
+ return 0;
+}
+
+static int iscsit_send_status(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn)
+{
+ u8 iov_count = 0, recovery;
+ u32 padding = 0, trace_type, tx_size = 0;
+ struct iscsi_scsi_rsp *hdr;
+ struct kvec *iov;
+
+ recovery = (cmd->i_state != ISTATE_SEND_STATUS);
+ if (!recovery)
+ cmd->stat_sn = conn->stat_sn++;
+
+ spin_lock_bh(&conn->sess->session_stats_lock);
+ conn->sess->rsp_pdus++;
+ spin_unlock_bh(&conn->sess->session_stats_lock);
+
+ hdr = (struct iscsi_scsi_rsp *) cmd->pdu;
+ memset(hdr, 0, ISCSI_HDR_LEN);
+ hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
+ hdr->flags |= ISCSI_FLAG_CMD_FINAL;
+ if (SE_CMD(cmd)->se_cmd_flags & SCF_OVERFLOW_BIT) {
+ hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
+ hdr->residual_count = cpu_to_be32(cmd->residual_count);
+ } else if (SE_CMD(cmd)->se_cmd_flags & SCF_UNDERFLOW_BIT) {
+ hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
+ hdr->residual_count = cpu_to_be32(cmd->residual_count);
+ }
+ hdr->response = cmd->iscsi_response;
+ hdr->cmd_status = SE_CMD(cmd)->scsi_status;
+ hdr->itt = cpu_to_be32(cmd->init_task_tag);
+ hdr->statsn = cpu_to_be32(cmd->stat_sn);
+
+ iscsit_increment_maxcmdsn(cmd, conn->sess);
+ hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
+ hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
+
+ iov = &cmd->iov_misc[0];
+ iov[iov_count].iov_base = cmd->pdu;
+ iov[iov_count++].iov_len = ISCSI_HDR_LEN;
+ tx_size += ISCSI_HDR_LEN;
+
+ /*
+ * Attach SENSE DATA payload to iSCSI Response PDU
+ */
+ if (SE_CMD(cmd)->sense_buffer &&
+ ((SE_CMD(cmd)->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
+ (SE_CMD(cmd)->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
+ padding = -(SE_CMD(cmd)->scsi_sense_length) & 3;
+ hton24(hdr->dlength, SE_CMD(cmd)->scsi_sense_length);
+ iov[iov_count].iov_base = SE_CMD(cmd)->sense_buffer;
+ iov[iov_count++].iov_len =
+ (SE_CMD(cmd)->scsi_sense_length + padding);
+ tx_size += SE_CMD(cmd)->scsi_sense_length;
+
+ if (padding) {
+ memset(SE_CMD(cmd)->sense_buffer +
+ SE_CMD(cmd)->scsi_sense_length, 0, padding);
+ tx_size += padding;
+ TRACE(TRACE_ISCSI, "Adding %u bytes of padding to"
+ " SENSE.\n", padding);
+ }
+
+ if (conn->conn_ops->DataDigest) {
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
+ SE_CMD(cmd)->sense_buffer,
+ (SE_CMD(cmd)->scsi_sense_length + padding),
+ 0, NULL, (u8 *)&cmd->data_crc);
+
+ iov[iov_count].iov_base = &cmd->data_crc;
+ iov[iov_count++].iov_len = ISCSI_CRC_LEN;
+ tx_size += ISCSI_CRC_LEN;
+
+ TRACE(TRACE_DIGEST, "Attaching CRC32 DataDigest for"
+ " SENSE, %u bytes CRC 0x%08x\n",
+ (SE_CMD(cmd)->scsi_sense_length + padding),
+ cmd->data_crc);
+ }
+
+ TRACE(TRACE_ISCSI, "Attaching SENSE DATA: %u bytes to iSCSI"
+ " Response PDU\n",
+ SE_CMD(cmd)->scsi_sense_length);
+ }
+
+ if (conn->conn_ops->HeaderDigest) {
+ u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
+
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
+ (unsigned char *)hdr, ISCSI_HDR_LEN,
+ 0, NULL, (u8 *)header_digest);
+
+ iov[0].iov_len += ISCSI_CRC_LEN;
+ tx_size += ISCSI_CRC_LEN;
+ TRACE(TRACE_DIGEST, "Attaching CRC32 HeaderDigest for Response"
+ " PDU 0x%08x\n", *header_digest);
+ }
+
+ cmd->iov_misc_count = iov_count;
+ cmd->tx_size = tx_size;
+
+ trace_type = (!recovery) ? TRACE_ISCSI : TRACE_ERL1;
+ TRACE(trace_type, "Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
+ " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
+ (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
+ cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
+
+ return 0;
+}
+
+static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
+{
+ switch (se_tmr->response) {
+ case TMR_FUNCTION_COMPLETE:
+ return ISCSI_TMF_RSP_COMPLETE;
+ case TMR_TASK_DOES_NOT_EXIST:
+ return ISCSI_TMF_RSP_NO_TASK;
+ case TMR_LUN_DOES_NOT_EXIST:
+ return ISCSI_TMF_RSP_NO_LUN;
+ case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
+ return ISCSI_TMF_RSP_NOT_SUPPORTED;
+ case TMR_FUNCTION_AUTHORIZATION_FAILED:
+ return ISCSI_TMF_RSP_AUTH_FAILED;
+ case TMR_FUNCTION_REJECTED:
+ default:
+ return ISCSI_TMF_RSP_REJECTED;
+ }
+}
+
+static int iscsit_send_task_mgt_rsp(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn)
+{
+ struct se_tmr_req *se_tmr = SE_CMD(cmd)->se_tmr_req;
+ struct iscsi_tm_rsp *hdr;
+ u32 tx_size = 0;
+
+ hdr = (struct iscsi_tm_rsp *) cmd->pdu;
+ memset(hdr, 0, ISCSI_HDR_LEN);
+ hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
+ hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
+ hdr->itt = cpu_to_be32(cmd->init_task_tag);
+ cmd->stat_sn = conn->stat_sn++;
+ hdr->statsn = cpu_to_be32(cmd->stat_sn);
+
+ iscsit_increment_maxcmdsn(cmd, conn->sess);
+ hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
+ hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
+
+ cmd->iov_misc[0].iov_base = cmd->pdu;
+ cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
+ tx_size += ISCSI_HDR_LEN;
+
+ if (conn->conn_ops->HeaderDigest) {
+ u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
+
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
+ (unsigned char *)hdr, ISCSI_HDR_LEN,
+ 0, NULL, (u8 *)header_digest);
+
+ cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
+ tx_size += ISCSI_CRC_LEN;
+ TRACE(TRACE_DIGEST, "Attaching CRC32 HeaderDigest for Task"
+ " Mgmt Response PDU 0x%08x\n", *header_digest);
+ }
+
+ cmd->iov_misc_count = 1;
+ cmd->tx_size = tx_size;
+
+ TRACE(TRACE_ERL2, "Built Task Management Response ITT: 0x%08x,"
+ " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
+ cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
+
+ return 0;
+}
+
+static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
+{
+ char *payload = NULL;
+ struct iscsi_conn *conn = cmd->conn;
+ struct iscsi_portal_group *tpg;
+ struct iscsi_tiqn *tiqn;
+ struct iscsi_tpg_np *tpg_np;
+ int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
+ unsigned char buf[256];
+
+ buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
+ 32768 : conn->conn_ops->MaxRecvDataSegmentLength;
+
+ memset(buf, 0, 256);
+
+ payload = kzalloc(buffer_len, GFP_KERNEL);
+ if (!payload) {
+ printk(KERN_ERR "Unable to allocate memory for sendtargets"
+ " response.\n");
+ return -ENOMEM;
+ }
+
+ spin_lock(&tiqn_lock);
+ list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
+ len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
+ len += 1;
+
+ if ((len + payload_len) > buffer_len) {
+ spin_unlock(&tiqn->tiqn_tpg_lock);
+ end_of_buf = 1;
+ goto eob;
+ }
+ memcpy((void *)payload + payload_len, buf, len);
+ payload_len += len;
+
+ spin_lock(&tiqn->tiqn_tpg_lock);
+ list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
+
+ spin_lock(&tpg->tpg_state_lock);
+ if ((tpg->tpg_state == TPG_STATE_FREE) ||
+ (tpg->tpg_state == TPG_STATE_INACTIVE)) {
+ spin_unlock(&tpg->tpg_state_lock);
+ continue;
+ }
+ spin_unlock(&tpg->tpg_state_lock);
+
+ spin_lock(&tpg->tpg_np_lock);
+ list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
+ tpg_np_list) {
+ len = sprintf(buf, "TargetAddress="
+ "%s%s%s:%hu,%hu",
+ (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
+ "[" : "", tpg_np->tpg_np->np_ip,
+ (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
+ "]" : "", tpg_np->tpg_np->np_port,
+ tpg->tpgt);
+ len += 1;
+
+ if ((len + payload_len) > buffer_len) {
+ spin_unlock(&tpg->tpg_np_lock);
+ spin_unlock(&tiqn->tiqn_tpg_lock);
+ end_of_buf = 1;
+ goto eob;
+ }
+ memcpy((void *)payload + payload_len, buf, len);
+ payload_len += len;
+ }
+ spin_unlock(&tpg->tpg_np_lock);
+ }
+ spin_unlock(&tiqn->tiqn_tpg_lock);
+eob:
+ if (end_of_buf)
+ break;
+ }
+ spin_unlock(&tiqn_lock);
+
+ cmd->buf_ptr = payload;
+
+ return payload_len;
+}
+
+/*
+ * FIXME: Add support for F_BIT and C_BIT when the length is longer than
+ * MaxRecvDataSegmentLength.
+ */
+static int iscsit_send_text_rsp(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn)
+{
+ struct iscsi_text_rsp *hdr;
+ struct kvec *iov;
+ u32 padding = 0, tx_size = 0;
+ int text_length, iov_count = 0;
+
+ text_length = iscsit_build_sendtargets_response(cmd);
+ if (text_length < 0)
+ return text_length;
+
+ padding = ((-text_length) & 3);
+ if (padding != 0) {
+ memset(cmd->buf_ptr + text_length, 0, padding);
+ TRACE(TRACE_ISCSI, "Attaching %u additional bytes for"
+ " padding.\n", padding);
+ }
+
+ hdr = (struct iscsi_text_rsp *) cmd->pdu;
+ memset(hdr, 0, ISCSI_HDR_LEN);
+ hdr->opcode = ISCSI_OP_TEXT_RSP;
+ hdr->flags |= ISCSI_FLAG_CMD_FINAL;
+ hton24(hdr->dlength, text_length);
+ hdr->itt = cpu_to_be32(cmd->init_task_tag);
+ hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
+ cmd->stat_sn = conn->stat_sn++;
+ hdr->statsn = cpu_to_be32(cmd->stat_sn);
+
+ iscsit_increment_maxcmdsn(cmd, conn->sess);
+ hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
+ hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
+
+ iov = &cmd->iov_misc[0];
+
+ iov[iov_count].iov_base = cmd->pdu;
+ iov[iov_count++].iov_len = ISCSI_HDR_LEN;
+ iov[iov_count].iov_base = cmd->buf_ptr;
+ iov[iov_count++].iov_len = text_length + padding;
+
+ tx_size += (ISCSI_HDR_LEN + text_length + padding);
+
+ if (conn->conn_ops->HeaderDigest) {
+ u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
+
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
+ (unsigned char *)hdr, ISCSI_HDR_LEN,
+ 0, NULL, (u8 *)header_digest);
+
+ iov[0].iov_len += ISCSI_CRC_LEN;
+ tx_size += ISCSI_CRC_LEN;
+ TRACE(TRACE_DIGEST, "Attaching CRC32 HeaderDigest for"
+ " Text Response PDU 0x%08x\n", *header_digest);
+ }
+
+ if (conn->conn_ops->DataDigest) {
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
+ cmd->buf_ptr, (text_length + padding),
+ 0, NULL, (u8 *)&cmd->data_crc);
+
+ iov[iov_count].iov_base = &cmd->data_crc;
+ iov[iov_count++].iov_len = ISCSI_CRC_LEN;
+ tx_size += ISCSI_CRC_LEN;
+
+ TRACE(TRACE_DIGEST, "Attaching DataDigest for %u bytes of text"
+ " data, CRC 0x%08x\n", (text_length + padding),
+ cmd->data_crc);
+ }
+
+ cmd->iov_misc_count = iov_count;
+ cmd->tx_size = tx_size;
+
+ TRACE(TRACE_ISCSI, "Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
+ " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
+ text_length, conn->cid);
+ return 0;
+}
+
+static int iscsit_send_reject(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn)
+{
+ u32 iov_count = 0, tx_size = 0;
+ struct iscsi_reject *hdr;
+ struct kvec *iov;
+
+ hdr = (struct iscsi_reject *) cmd->pdu;
+ hdr->opcode = ISCSI_OP_REJECT;
+ hdr->flags |= ISCSI_FLAG_CMD_FINAL;
+ hton24(hdr->dlength, ISCSI_HDR_LEN);
+ cmd->stat_sn = conn->stat_sn++;
+ hdr->statsn = cpu_to_be32(cmd->stat_sn);
+ hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
+ hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
+
+ iov = &cmd->iov_misc[0];
+
+ iov[iov_count].iov_base = cmd->pdu;
+ iov[iov_count++].iov_len = ISCSI_HDR_LEN;
+ iov[iov_count].iov_base = cmd->buf_ptr;
+ iov[iov_count++].iov_len = ISCSI_HDR_LEN;
+
+ tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
+
+ if (conn->conn_ops->HeaderDigest) {
+ u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
+
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
+ (unsigned char *)hdr, ISCSI_HDR_LEN,
+ 0, NULL, (u8 *)header_digest);
+
+ iov[0].iov_len += ISCSI_CRC_LEN;
+ tx_size += ISCSI_CRC_LEN;
+ TRACE(TRACE_DIGEST, "Attaching CRC32 HeaderDigest for"
+ " REJECT PDU 0x%08x\n", *header_digest);
+ }
+
+ if (conn->conn_ops->DataDigest) {
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
+ (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
+ 0, NULL, (u8 *)&cmd->data_crc);
+
+ iov[iov_count].iov_base = &cmd->data_crc;
+ iov[iov_count++].iov_len = ISCSI_CRC_LEN;
+ tx_size += ISCSI_CRC_LEN;
+ TRACE(TRACE_DIGEST, "Attaching CRC32 DataDigest for REJECT"
+ " PDU 0x%08x\n", cmd->data_crc);
+ }
+
+ cmd->iov_misc_count = iov_count;
+ cmd->tx_size = tx_size;
+
+ TRACE(TRACE_ISCSI, "Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
+ " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
+
+ return 0;
+}
+
+static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
+{
+ if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
+ (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
+ wait_for_completion_interruptible_timeout(
+ &conn->tx_half_close_comp,
+ ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
+ }
+}
+
+#ifdef CONFIG_SMP
+
+void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
+{
+ struct iscsi_thread_set *ts = conn->thread_set;
+ int ord, cpu;
+ /*
+ * thread_id is assigned from iscsit_global->ts_bitmap from
+ * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
+ *
+ * Here we use thread_id to determine which CPU that this
+ * iSCSI connection's iscsi_thread_set will be scheduled to
+ * execute upon.
+ */
+ ord = ts->thread_id % cpumask_weight(cpu_online_mask);
+#if 0
+ printk(KERN_INFO ">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
+ " thread_id: %d\n", ord, ts->thread_id);
+#endif
+ for_each_online_cpu(cpu) {
+ if (ord-- == 0) {
+ cpumask_set_cpu(cpu, conn->conn_cpumask);
+ return;
+ }
+ }
+ /*
+ * This should never be reached..
+ */
+ dump_stack();
+ cpumask_setall(conn->conn_cpumask);
+}
+
+static inline void iscsit_thread_check_cpumask(
+ struct iscsi_conn *conn,
+ struct task_struct *p,
+ int mode)
+{
+ char buf[128];
+ /*
+ * mode == 1 signals iscsi_target_tx_thread() usage.
+ * mode == 0 signals iscsi_target_rx_thread() usage.
+ */
+ if (mode == 1) {
+ if (!conn->conn_tx_reset_cpumask)
+ return;
+ conn->conn_tx_reset_cpumask = 0;
+ } else {
+ if (!conn->conn_rx_reset_cpumask)
+ return;
+ conn->conn_rx_reset_cpumask = 0;
+ }
+ /*
+ * Update the CPU mask for this single kthread so that
+ * both TX and RX kthreads are scheduled to run on the
+ * same CPU.
+ */
+ memset(buf, 0, 128);
+ cpumask_scnprintf(buf, 128, conn->conn_cpumask);
+#if 0
+ printk(KERN_INFO ">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
+ " %s for %s\n", buf, p->comm);
+#endif
+ set_cpus_allowed_ptr(p, conn->conn_cpumask);
+}
+
+#else
+#define iscsit_thread_get_cpumask(X) ({})
+#define iscsit_thread_check_cpumask(X, Y, Z) ({})
+#endif /* CONFIG_SMP */
+
+int iscsi_target_tx_thread(void *arg)
+{
+ u8 state;
+ int eodr = 0, map_sg = 0, ret = 0, sent_status = 0, use_misc = 0;
+ struct iscsi_cmd *cmd = NULL;
+ struct iscsi_conn *conn;
+ struct iscsi_queue_req *qr = NULL;
+ struct se_cmd *se_cmd;
+ struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
+ struct se_unmap_sg unmap_sg;
+ /*
+ * Allow ourselves to be interrupted by SIGINT so that a
+ * connection recovery / failure event can be triggered externally.
+ */
+ allow_signal(SIGINT);
+
+restart:
+ conn = iscsi_tx_thread_pre_handler(ts);
+ if (!conn)
+ goto out;
+
+ eodr = map_sg = ret = sent_status = use_misc = 0;
+
+ while (!kthread_should_stop()) {
+ /*
+ * Ensure that both TX and RX per connection kthreads
+ * are scheduled to run on the same CPU.
+ */
+ iscsit_thread_check_cpumask(conn, current, 1);
+
+ schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
+
+ if ((ts->status == ISCSI_THREAD_SET_RESET) ||
+ signal_pending(current))
+ goto transport_err;
+
+get_immediate:
+ qr = iscsit_get_cmd_from_immediate_queue(conn);
+ if (qr) {
+ atomic_set(&conn->check_immediate_queue, 0);
+ cmd = qr->cmd;
+ state = qr->state;
+ kmem_cache_free(lio_qr_cache, qr);
+
+ spin_lock_bh(&cmd->istate_lock);
+ switch (state) {
+ case ISTATE_SEND_R2T:
+ spin_unlock_bh(&cmd->istate_lock);
+ ret = iscsit_send_r2t(cmd, conn);
+ break;
+ case ISTATE_REMOVE:
+ spin_unlock_bh(&cmd->istate_lock);
+
+ if (cmd->data_direction == DMA_TO_DEVICE)
+ iscsit_stop_dataout_timer(cmd);
+
+ spin_lock_bh(&conn->cmd_lock);
+ list_del(&cmd->i_list);
+ spin_unlock_bh(&conn->cmd_lock);
+ /*
+ * Determine if a struct se_cmd is assoicated with
+ * this struct iscsi_cmd.
+ */
+ if (!(SE_CMD(cmd)->se_cmd_flags & SCF_SE_LUN_CMD) &&
+ !(cmd->tmr_req))
+ iscsit_release_cmd(cmd);
+ else
+ transport_generic_free_cmd(SE_CMD(cmd),
+ 1, 1, 0);
+ goto get_immediate;
+ case ISTATE_SEND_NOPIN_WANT_RESPONSE:
+ spin_unlock_bh(&cmd->istate_lock);
+ iscsit_mod_nopin_response_timer(conn);
+ ret = iscsit_send_unsolicited_nopin(cmd,
+ conn, 1);
+ break;
+ case ISTATE_SEND_NOPIN_NO_RESPONSE:
+ spin_unlock_bh(&cmd->istate_lock);
+ ret = iscsit_send_unsolicited_nopin(cmd,
+ conn, 0);
+ break;
+ default:
+ printk(KERN_ERR "Unknown Opcode: 0x%02x ITT:"
+ " 0x%08x, i_state: %d on CID: %hu\n",
+ cmd->iscsi_opcode, cmd->init_task_tag, state,
+ conn->cid);
+ spin_unlock_bh(&cmd->istate_lock);
+ goto transport_err;
+ }
+ if (ret < 0) {
+ conn->tx_immediate_queue = 0;
+ goto transport_err;
+ }
+
+ if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
+ conn->tx_immediate_queue = 0;
+ iscsit_tx_thread_wait_for_tcp(conn);
+ goto transport_err;
+ }
+
+ spin_lock_bh(&cmd->istate_lock);
+ switch (state) {
+ case ISTATE_SEND_R2T:
+ spin_unlock_bh(&cmd->istate_lock);
+ spin_lock_bh(&cmd->dataout_timeout_lock);
+ iscsit_start_dataout_timer(cmd, conn);
+ spin_unlock_bh(&cmd->dataout_timeout_lock);
+ break;
+ case ISTATE_SEND_NOPIN_WANT_RESPONSE:
+ cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
+ spin_unlock_bh(&cmd->istate_lock);
+ break;
+ case ISTATE_SEND_NOPIN_NO_RESPONSE:
+ cmd->i_state = ISTATE_SENT_STATUS;
+ spin_unlock_bh(&cmd->istate_lock);
+ break;
+ default:
+ printk(KERN_ERR "Unknown Opcode: 0x%02x ITT:"
+ " 0x%08x, i_state: %d on CID: %hu\n",
+ cmd->iscsi_opcode, cmd->init_task_tag,
+ state, conn->cid);
+ spin_unlock_bh(&cmd->istate_lock);
+ goto transport_err;
+ }
+ goto get_immediate;
+ } else
+ conn->tx_immediate_queue = 0;
+
+get_response:
+ qr = iscsit_get_cmd_from_response_queue(conn);
+ if (qr) {
+ cmd = qr->cmd;
+ state = qr->state;
+ kmem_cache_free(lio_qr_cache, qr);
+
+ spin_lock_bh(&cmd->istate_lock);
+check_rsp_state:
+ switch (state) {
+ case ISTATE_SEND_DATAIN:
+ spin_unlock_bh(&cmd->istate_lock);
+ memset(&unmap_sg, 0,
+ sizeof(struct se_unmap_sg));
+ unmap_sg.fabric_cmd = (void *)cmd;
+ unmap_sg.se_cmd = SE_CMD(cmd);
+ map_sg = 1;
+ ret = iscsit_send_data_in(cmd, conn,
+ &unmap_sg, &eodr);
+ break;
+ case ISTATE_SEND_STATUS:
+ case ISTATE_SEND_STATUS_RECOVERY:
+ spin_unlock_bh(&cmd->istate_lock);
+ use_misc = 1;
+ ret = iscsit_send_status(cmd, conn);
+ break;
+ case ISTATE_SEND_LOGOUTRSP:
+ spin_unlock_bh(&cmd->istate_lock);
+ use_misc = 1;
+ ret = iscsit_send_logout_response(cmd, conn);
+ break;
+ case ISTATE_SEND_ASYNCMSG:
+ spin_unlock_bh(&cmd->istate_lock);
+ use_misc = 1;
+ ret = iscsit_send_conn_drop_async_message(
+ cmd, conn);
+ break;
+ case ISTATE_SEND_NOPIN:
+ spin_unlock_bh(&cmd->istate_lock);
+ use_misc = 1;
+ ret = iscsit_send_nopin_response(cmd, conn);
+ break;
+ case ISTATE_SEND_REJECT:
+ spin_unlock_bh(&cmd->istate_lock);
+ use_misc = 1;
+ ret = iscsit_send_reject(cmd, conn);
+ break;
+ case ISTATE_SEND_TASKMGTRSP:
+ spin_unlock_bh(&cmd->istate_lock);
+ use_misc = 1;
+ ret = iscsit_send_task_mgt_rsp(cmd, conn);
+ if (ret != 0)
+ break;
+ ret = iscsit_tmr_post_handler(cmd, conn);
+ if (ret != 0)
+ iscsit_fall_back_to_erl0(conn->sess);
+ break;
+ case ISTATE_SEND_TEXTRSP:
+ spin_unlock_bh(&cmd->istate_lock);
+ use_misc = 1;
+ ret = iscsit_send_text_rsp(cmd, conn);
+ break;
+ default:
+ printk(KERN_ERR "Unknown Opcode: 0x%02x ITT:"
+ " 0x%08x, i_state: %d on CID: %hu\n",
+ cmd->iscsi_opcode, cmd->init_task_tag,
+ state, conn->cid);
+ spin_unlock_bh(&cmd->istate_lock);
+ goto transport_err;
+ }
+ if (ret < 0) {
+ conn->tx_response_queue = 0;
+ goto transport_err;
+ }
+
+ se_cmd = &cmd->se_cmd;
+
+ if (map_sg && !conn->conn_ops->IFMarker &&
+ se_cmd->t_task->t_tasks_se_num) {
+ iscsit_map_SG_segments(&unmap_sg);
+ if (iscsit_fe_sendpage_sg(&unmap_sg, conn) < 0) {
+ conn->tx_response_queue = 0;
+ iscsit_tx_thread_wait_for_tcp(conn);
+ iscsit_unmap_SG_segments(&unmap_sg);
+ goto transport_err;
+ }
+ iscsit_unmap_SG_segments(&unmap_sg);
+ map_sg = 0;
+ } else {
+ if (map_sg)
+ iscsit_map_SG_segments(&unmap_sg);
+ if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
+ conn->tx_response_queue = 0;
+ iscsit_tx_thread_wait_for_tcp(conn);
+ if (map_sg)
+ iscsit_unmap_SG_segments(&unmap_sg);
+ goto transport_err;
+ }
+ if (map_sg) {
+ iscsit_unmap_SG_segments(&unmap_sg);
+ map_sg = 0;
+ }
+ }
+
+ spin_lock_bh(&cmd->istate_lock);
+ switch (state) {
+ case ISTATE_SEND_DATAIN:
+ if (!eodr)
+ goto check_rsp_state;
+
+ if (eodr == 1) {
+ cmd->i_state = ISTATE_SENT_LAST_DATAIN;
+ sent_status = 1;
+ eodr = use_misc = 0;
+ } else if (eodr == 2) {
+ cmd->i_state = state =
+ ISTATE_SEND_STATUS;
+ sent_status = 0;
+ eodr = use_misc = 0;
+ goto check_rsp_state;
+ }
+ break;
+ case ISTATE_SEND_STATUS:
+ use_misc = 0;
+ sent_status = 1;
+ break;
+ case ISTATE_SEND_ASYNCMSG:
+ case ISTATE_SEND_NOPIN:
+ case ISTATE_SEND_STATUS_RECOVERY:
+ case ISTATE_SEND_TEXTRSP:
+ use_misc = 0;
+ sent_status = 1;
+ break;
+ case ISTATE_SEND_REJECT:
+ use_misc = 0;
+ if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
+ cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
+ spin_unlock_bh(&cmd->istate_lock);
+ complete(&cmd->reject_comp);
+ goto transport_err;
+ }
+ complete(&cmd->reject_comp);
+ break;
+ case ISTATE_SEND_TASKMGTRSP:
+ use_misc = 0;
+ sent_status = 1;
+ break;
+ case ISTATE_SEND_LOGOUTRSP:
+ spin_unlock_bh(&cmd->istate_lock);
+ if (!(iscsit_logout_post_handler(cmd, conn)))
+ goto restart;
+ spin_lock_bh(&cmd->istate_lock);
+ use_misc = 0;
+ sent_status = 1;
+ break;
+ default:
+ printk(KERN_ERR "Unknown Opcode: 0x%02x ITT:"
+ " 0x%08x, i_state: %d on CID: %hu\n",
+ cmd->iscsi_opcode, cmd->init_task_tag,
+ cmd->i_state, conn->cid);
+ spin_unlock_bh(&cmd->istate_lock);
+ goto transport_err;
+ }
+
+ if (sent_status) {
+ cmd->i_state = ISTATE_SENT_STATUS;
+ sent_status = 0;
+ }
+ spin_unlock_bh(&cmd->istate_lock);
+
+ if (atomic_read(&conn->check_immediate_queue))
+ goto get_immediate;
+
+ goto get_response;
+ } else
+ conn->tx_response_queue = 0;
+ }
+
+transport_err:
+ iscsit_take_action_for_connection_exit(conn);
+ goto restart;
+out:
+ return 0;
+}
+
+int iscsi_target_rx_thread(void *arg)
+{
+ int ret;
+ u8 buffer[ISCSI_HDR_LEN], opcode;
+ u32 checksum = 0, digest = 0;
+ struct iscsi_conn *conn = NULL;
+ struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
+ struct kvec iov;
+ /*
+ * Allow ourselves to be interrupted by SIGINT so that a
+ * connection recovery / failure event can be triggered externally.
+ */
+ allow_signal(SIGINT);
+
+restart:
+ conn = iscsi_rx_thread_pre_handler(ts);
+ if (!conn)
+ goto out;
+
+ while (!kthread_should_stop()) {
+ /*
+ * Ensure that both TX and RX per connection kthreads
+ * are scheduled to run on the same CPU.
+ */
+ iscsit_thread_check_cpumask(conn, current, 0);
+
+ memset(buffer, 0, ISCSI_HDR_LEN);
+ memset(&iov, 0, sizeof(struct kvec));
+
+ iov.iov_base = buffer;
+ iov.iov_len = ISCSI_HDR_LEN;
+
+ ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
+ if (ret != ISCSI_HDR_LEN) {
+ iscsit_rx_thread_wait_for_tcp(conn);
+ goto transport_err;
+ }
+
+ /*
+ * Set conn->bad_hdr for use with REJECT PDUs.
+ */
+ memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
+
+ if (conn->conn_ops->HeaderDigest) {
+ iov.iov_base = &digest;
+ iov.iov_len = ISCSI_CRC_LEN;
+
+ ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
+ if (ret != ISCSI_CRC_LEN) {
+ iscsit_rx_thread_wait_for_tcp(conn);
+ goto transport_err;
+ }
+
+ iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
+ buffer, ISCSI_HDR_LEN,
+ 0, NULL, (u8 *)&checksum);
+
+ if (digest != checksum) {
+ printk(KERN_ERR "HeaderDigest CRC32C failed,"
+ " received 0x%08x, computed 0x%08x\n",
+ digest, checksum);
+ /*
+ * Set the PDU to 0xff so it will intentionally
+ * hit default in the switch below.
+ */
+ memset(buffer, 0xff, ISCSI_HDR_LEN);
+ spin_lock_bh(&conn->sess->session_stats_lock);
+ conn->sess->conn_digest_errors++;
+ spin_unlock_bh(&conn->sess->session_stats_lock);
+ } else {
+ TRACE(TRACE_DIGEST, "Got HeaderDigest CRC32C"
+ " 0x%08x\n", checksum);
+ }
+ }
+
+ if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
+ goto transport_err;
+
+ opcode = buffer[0] & ISCSI_OPCODE_MASK;
+
+ if (conn->sess->sess_ops->SessionType &&
+ ((!(opcode & ISCSI_OP_TEXT)) ||
+ (!(opcode & ISCSI_OP_LOGOUT)))) {
+ printk(KERN_ERR "Received illegal iSCSI Opcode: 0x%02x"
+ " while in Discovery Session, rejecting.\n", opcode);
+ iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
+ buffer, conn);
+ goto transport_err;
+ }
+
+ switch (opcode) {
+ case ISCSI_OP_SCSI_CMD:
+ if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
+ goto transport_err;
+ break;
+ case ISCSI_OP_SCSI_DATA_OUT:
+ if (iscsit_handle_data_out(conn, buffer) < 0)
+ goto transport_err;
+ break;
+ case ISCSI_OP_NOOP_OUT:
+ if (iscsit_handle_nop_out(conn, buffer) < 0)
+ goto transport_err;
+ break;
+ case ISCSI_OP_SCSI_TMFUNC:
+ if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
+ goto transport_err;
+ break;
+ case ISCSI_OP_TEXT:
+ if (iscsit_handle_text_cmd(conn, buffer) < 0)
+ goto transport_err;
+ break;
+ case ISCSI_OP_LOGOUT:
+ ret = iscsit_handle_logout_cmd(conn, buffer);
+ if (ret > 0) {
+ wait_for_completion(&conn->conn_logout_comp);
+ goto transport_err;
+ } else if (ret < 0)
+ goto transport_err;
+ break;
+ case ISCSI_OP_SNACK:
+ if (iscsit_handle_snack(conn, buffer) < 0)
+ goto transport_err;
+ break;
+ default:
+ printk(KERN_ERR "Got unknown iSCSI OpCode: 0x%02x\n",
+ opcode);
+ if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
+ printk(KERN_ERR "Cannot recover from unknown"
+ " opcode while ERL=0, closing iSCSI connection"
+ ".\n");
+ goto transport_err;
+ }
+ if (!conn->conn_ops->OFMarker) {
+ printk(KERN_ERR "Unable to recover from unknown"
+ " opcode while OFMarker=No, closing iSCSI"
+ " connection.\n");
+ goto transport_err;
+ }
+ if (iscsit_recover_from_unknown_opcode(conn) < 0) {
+ printk(KERN_ERR "Unable to recover from unknown"
+ " opcode, closing iSCSI connection.\n");
+ goto transport_err;
+ }
+ break;
+ }
+ }
+
+transport_err:
+ if (!signal_pending(current))
+ atomic_set(&conn->transport_failed, 1);
+ iscsit_take_action_for_connection_exit(conn);
+ goto restart;
+out:
+ return 0;
+}
+
+static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
+{
+ struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
+ struct iscsi_session *sess = conn->sess;
+ struct se_cmd *se_cmd;
+ /*
+ * We expect this function to only ever be called from either RX or TX
+ * thread context via iscsit_close_connection() once the other context
+ * has been reset -> returned sleeping pre-handler state.
+ */
+ spin_lock_bh(&conn->cmd_lock);
+ list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
+ if (!(SE_CMD(cmd)) ||
+ !(SE_CMD(cmd)->se_cmd_flags & SCF_SE_LUN_CMD)) {
+
+ list_del(&cmd->i_list);
+ spin_unlock_bh(&conn->cmd_lock);
+ iscsit_increment_maxcmdsn(cmd, sess);
+ se_cmd = SE_CMD(cmd);
+ /*
+ * Special cases for active iSCSI TMR, and
+ * transport_lookup_cmd_lun() failing from
+ * iscsit_get_lun_for_cmd() in iscsit_handle_scsi_cmd().
+ */
+ if (cmd->tmr_req && se_cmd->transport_wait_for_tasks)
+ se_cmd->transport_wait_for_tasks(se_cmd, 1, 1);
+ else if (SE_CMD(cmd)->se_cmd_flags & SCF_SE_LUN_CMD)
+ transport_release_cmd_to_pool(se_cmd);
+ else
+ iscsit_release_cmd(cmd);
+
+ spin_lock_bh(&conn->cmd_lock);
+ continue;
+ }
+ list_del(&cmd->i_list);
+ spin_unlock_bh(&conn->cmd_lock);
+
+ iscsit_increment_maxcmdsn(cmd, sess);
+ se_cmd = SE_CMD(cmd);
+
+ if (se_cmd->transport_wait_for_tasks)
+ se_cmd->transport_wait_for_tasks(se_cmd, 1, 1);
+
+ spin_lock_bh(&conn->cmd_lock);
+ }
+ spin_unlock_bh(&conn->cmd_lock);
+}
+
+static void iscsit_stop_timers_for_cmds(
+ struct iscsi_conn *conn)
+{
+ struct iscsi_cmd *cmd;
+
+ spin_lock_bh(&conn->cmd_lock);
+ list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
+ if (cmd->data_direction == DMA_TO_DEVICE)
+ iscsit_stop_dataout_timer(cmd);
+ }
+ spin_unlock_bh(&conn->cmd_lock);
+}
+
+int iscsit_close_connection(
+ struct iscsi_conn *conn)
+{
+ int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
+ struct iscsi_session *sess = conn->sess;
+
+ TRACE(TRACE_ISCSI, "Closing iSCSI connection CID %hu on SID:"
+ " %u\n", conn->cid, sess->sid);
+ /*
+ * Always up conn_logout_comp just in case the RX Thread is sleeping
+ * and the logout response never got sent because the connection
+ * failed.
+ */
+ complete(&conn->conn_logout_comp);
+
+ iscsi_release_thread_set(conn);
+
+ iscsit_stop_timers_for_cmds(conn);
+ iscsit_stop_nopin_response_timer(conn);
+ iscsit_stop_nopin_timer(conn);
+ iscsit_free_queue_reqs_for_conn(conn);
+
+ /*
+ * During Connection recovery drop unacknowledged out of order
+ * commands for this connection, and prepare the other commands
+ * for realligence.
+ *
+ * During normal operation clear the out of order commands (but
+ * do not free the struct iscsi_ooo_cmdsn's) and release all
+ * struct iscsi_cmds.
+ */
+ if (atomic_read(&conn->connection_recovery)) {
+ iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
+ iscsit_prepare_cmds_for_realligance(conn);
+ } else {
+ iscsit_clear_ooo_cmdsns_for_conn(conn);
+ iscsit_release_commands_from_conn(conn);
+ }
+
+ /*
+ * Handle decrementing session or connection usage count if
+ * a logout response was not able to be sent because the
+ * connection failed. Fall back to Session Recovery here.
+ */
+ if (atomic_read(&conn->conn_logout_remove)) {
+ if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
+ iscsit_dec_conn_usage_count(conn);
+ iscsit_dec_session_usage_count(sess);
+ }
+ if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
+ iscsit_dec_conn_usage_count(conn);
+
+ atomic_set(&conn->conn_logout_remove, 0);
+ atomic_set(&sess->session_reinstatement, 0);
+ atomic_set(&sess->session_fall_back_to_erl0, 1);
+ }
+
+ spin_lock_bh(&sess->conn_lock);
+ list_del(&conn->conn_list);
+
+ /*
+ * Attempt to let the Initiator know this connection failed by
+ * sending an Connection Dropped Async Message on another
+ * active connection.
+ */
+ if (atomic_read(&conn->connection_recovery))
+ iscsit_build_conn_drop_async_message(conn);
+
+ spin_unlock_bh(&sess->conn_lock);
+
+ /*
+ * If connection reinstatement is being performed on this connection,
+ * up the connection reinstatement semaphore that is being blocked on
+ * in iscsit_cause_connection_reinstatement().
+ */
+ spin_lock_bh(&conn->state_lock);
+ if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
+ spin_unlock_bh(&conn->state_lock);
+ complete(&conn->conn_wait_comp);
+ wait_for_completion(&conn->conn_post_wait_comp);
+ spin_lock_bh(&conn->state_lock);
+ }
+
+ /*
+ * If connection reinstatement is being performed on this connection
+ * by receiving a REMOVECONNFORRECOVERY logout request, up the
+ * connection wait rcfr semaphore that is being blocked on
+ * an iscsit_connection_reinstatement_rcfr().
+ */
+ if (atomic_read(&conn->connection_wait_rcfr)) {
+ spin_unlock_bh(&conn->state_lock);
+ complete(&conn->conn_wait_rcfr_comp);
+ wait_for_completion(&conn->conn_post_wait_comp);
+ spin_lock_bh(&conn->state_lock);
+ }
+ atomic_set(&conn->connection_reinstatement, 1);
+ spin_unlock_bh(&conn->state_lock);
+
+ /*
+ * If any other processes are accessing this connection pointer we
+ * must wait until they have completed.
+ */
+ iscsit_check_conn_usage_count(conn);
+
+ if (conn->conn_rx_hash.tfm)
+ crypto_free_hash(conn->conn_rx_hash.tfm);
+ if (conn->conn_tx_hash.tfm)
+ crypto_free_hash(conn->conn_tx_hash.tfm);
+
+ if (conn->conn_cpumask)
+ free_cpumask_var(conn->conn_cpumask);
+
+ kfree(conn->conn_ops);
+ conn->conn_ops = NULL;
+
+ if (conn->sock) {
+ if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
+ kfree(conn->sock->file);
+ conn->sock->file = NULL;
+ }
+ sock_release(conn->sock);
+ }
+ conn->thread_set = NULL;
+
+ TRACE(TRACE_STATE, "Moving to TARG_CONN_STATE_FREE.\n");
+ conn->conn_state = TARG_CONN_STATE_FREE;
+ kfree(conn);
+
+ spin_lock_bh(&sess->conn_lock);
+ atomic_dec(&sess->nconn);
+ printk(KERN_INFO "Decremented iSCSI connection count to %hu from node:"
+ " %s\n", atomic_read(&sess->nconn),
+ sess->sess_ops->InitiatorName);
+ /*
+ * Make sure that if one connection fails in an non ERL=2 iSCSI
+ * Session that they all fail.
+ */
+ if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
+ !atomic_read(&sess->session_logout))
+ atomic_set(&sess->session_fall_back_to_erl0, 1);
+
+ /*
+ * If this was not the last connection in the session, and we are
+ * performing session reinstatement or falling back to ERL=0, call
+ * iscsit_stop_session() without sleeping to shutdown the other
+ * active connections.
+ */
+ if (atomic_read(&sess->nconn)) {
+ if (!atomic_read(&sess->session_reinstatement) &&
+ !atomic_read(&sess->session_fall_back_to_erl0)) {
+ spin_unlock_bh(&sess->conn_lock);
+ return 0;
+ }
+ if (!atomic_read(&sess->session_stop_active)) {
+ atomic_set(&sess->session_stop_active, 1);
+ spin_unlock_bh(&sess->conn_lock);
+ iscsit_stop_session(sess, 0, 0);
+ return 0;
+ }
+ spin_unlock_bh(&sess->conn_lock);
+ return 0;
+ }
+
+ /*
+ * If this was the last connection in the session and one of the
+ * following is occurring:
+ *
+ * Session Reinstatement is not being performed, and are falling back
+ * to ERL=0 call iscsit_close_session().
+ *
+ * Session Logout was requested. iscsit_close_session() will be called
+ * elsewhere.
+ *
+ * Session Continuation is not being performed, start the Time2Retain
+ * handler and check if sleep_on_sess_wait_sem is active.
+ */
+ if (!atomic_read(&sess->session_reinstatement) &&
+ atomic_read(&sess->session_fall_back_to_erl0)) {
+ spin_unlock_bh(&sess->conn_lock);
+ iscsit_close_session(sess);
+
+ return 0;
+ } else if (atomic_read(&sess->session_logout)) {
+ TRACE(TRACE_STATE, "Moving to TARG_SESS_STATE_FREE.\n");
+ sess->session_state = TARG_SESS_STATE_FREE;
+ spin_unlock_bh(&sess->conn_lock);
+
+ if (atomic_read(&sess->sleep_on_sess_wait_comp))
+ complete(&sess->session_wait_comp);
+
+ return 0;
+ } else {
+ TRACE(TRACE_STATE, "Moving to TARG_SESS_STATE_FAILED.\n");
+ sess->session_state = TARG_SESS_STATE_FAILED;
+
+ if (!atomic_read(&sess->session_continuation)) {
+ spin_unlock_bh(&sess->conn_lock);
+ iscsit_start_time2retain_handler(sess);
+ } else
+ spin_unlock_bh(&sess->conn_lock);
+
+ if (atomic_read(&sess->sleep_on_sess_wait_comp))
+ complete(&sess->session_wait_comp);
+
+ return 0;
+ }
+ spin_unlock_bh(&sess->conn_lock);
+
+ return 0;
+}
+
+int iscsit_close_session(struct iscsi_session *sess)
+{
+ struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
+ struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
+
+ if (atomic_read(&sess->nconn)) {
+ printk(KERN_ERR "%d connection(s) still exist for iSCSI session"
+ " to %s\n", atomic_read(&sess->nconn),
+ sess->sess_ops->InitiatorName);
+ BUG();
+ }
+
+ spin_lock_bh(&se_tpg->session_lock);
+ atomic_set(&sess->session_logout, 1);
+ atomic_set(&sess->session_reinstatement, 1);
+ iscsit_stop_time2retain_timer(sess);
+ spin_unlock_bh(&se_tpg->session_lock);
+
+ /*
+ * transport_deregister_session_configfs() will clear the
+ * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
+ * can be setting it again with __transport_register_session() in
+ * iscsi_post_login_handler() again after the iscsit_stop_session()
+ * completes in iscsi_np context.
+ */
+ transport_deregister_session_configfs(sess->se_sess);
+
+ /*
+ * If any other processes are accessing this session pointer we must
+ * wait until they have completed. If we are in an interrupt (the
+ * time2retain handler) and contain and active session usage count we
+ * restart the timer and exit.
+ */
+ if (!in_interrupt()) {
+ if (iscsit_check_session_usage_count(sess) == 1)
+ iscsit_stop_session(sess, 1, 1);
+ } else {
+ if (iscsit_check_session_usage_count(sess) == 2) {
+ atomic_set(&sess->session_logout, 0);
+ iscsit_start_time2retain_handler(sess);
+ return 0;
+ }
+ }
+
+ transport_deregister_session(sess->se_sess);
+
+ if (sess->sess_ops->ErrorRecoveryLevel == 2)
+ iscsit_free_connection_recovery_entires(sess);
+
+ iscsit_free_all_ooo_cmdsns(sess);
+
+ spin_lock_bh(&se_tpg->session_lock);
+ TRACE(TRACE_STATE, "Moving to TARG_SESS_STATE_FREE.\n");
+ sess->session_state = TARG_SESS_STATE_FREE;
+ printk(KERN_INFO "Released iSCSI session from node: %s\n",
+ sess->sess_ops->InitiatorName);
+ tpg->nsessions--;
+ if (tpg->tpg_tiqn)
+ tpg->tpg_tiqn->tiqn_nsessions--;
+
+ printk(KERN_INFO "Decremented number of active iSCSI Sessions on"
+ " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
+
+ spin_lock(&sess_idr_lock);
+ idr_remove(&sess_idr, sess->session_index);
+ spin_unlock(&sess_idr_lock);
+
+ kfree(sess->sess_ops);
+ sess->sess_ops = NULL;
+ spin_unlock_bh(&se_tpg->session_lock);
+
+ kfree(sess);
+ return 0;
+}
+
+static void iscsit_logout_post_handler_closesession(
+ struct iscsi_conn *conn)
+{
+ struct iscsi_session *sess = conn->sess;
+
+ iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
+ iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
+
+ atomic_set(&conn->conn_logout_remove, 0);
+ complete(&conn->conn_logout_comp);
+
+ iscsit_dec_conn_usage_count(conn);
+ iscsit_stop_session(sess, 1, 1);
+ iscsit_dec_session_usage_count(sess);
+ iscsit_close_session(sess);
+}
+
+static void iscsit_logout_post_handler_samecid(
+ struct iscsi_conn *conn)
+{
+ iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
+ iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
+
+ atomic_set(&conn->conn_logout_remove, 0);
+ complete(&conn->conn_logout_comp);
+
+ iscsit_cause_connection_reinstatement(conn, 1);
+ iscsit_dec_conn_usage_count(conn);
+}
+
+static void iscsit_logout_post_handler_diffcid(
+ struct iscsi_conn *conn,
+ u16 cid)
+{
+ struct iscsi_conn *l_conn;
+ struct iscsi_session *sess = conn->sess;
+
+ if (!sess)
+ return;
+
+ spin_lock_bh(&sess->conn_lock);
+ list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
+ if (l_conn->cid == cid) {
+ iscsit_inc_conn_usage_count(l_conn);
+ break;
+ }
+ }
+ spin_unlock_bh(&sess->conn_lock);
+
+ if (!l_conn)
+ return;
+
+ if (l_conn->sock)
+ l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
+
+ spin_lock_bh(&l_conn->state_lock);
+ TRACE(TRACE_STATE, "Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
+ l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
+ spin_unlock_bh(&l_conn->state_lock);
+
+ iscsit_cause_connection_reinstatement(l_conn, 1);
+ iscsit_dec_conn_usage_count(l_conn);
+}
+
+/*
+ * Return of 0 causes the TX thread to restart.
+ */
+static int iscsit_logout_post_handler(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn)
+{
+ int ret = 0;
+
+ switch (cmd->logout_reason) {
+ case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
+ switch (cmd->logout_response) {
+ case ISCSI_LOGOUT_SUCCESS:
+ case ISCSI_LOGOUT_CLEANUP_FAILED:
+ default:
+ iscsit_logout_post_handler_closesession(conn);
+ break;
+ }
+ ret = 0;
+ break;
+ case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
+ if (conn->cid == cmd->logout_cid) {
+ switch (cmd->logout_response) {
+ case ISCSI_LOGOUT_SUCCESS:
+ case ISCSI_LOGOUT_CLEANUP_FAILED:
+ default:
+ iscsit_logout_post_handler_samecid(conn);
+ break;
+ }
+ ret = 0;
+ } else {
+ switch (cmd->logout_response) {
+ case ISCSI_LOGOUT_SUCCESS:
+ iscsit_logout_post_handler_diffcid(conn,
+ cmd->logout_cid);
+ break;
+ case ISCSI_LOGOUT_CID_NOT_FOUND:
+ case ISCSI_LOGOUT_CLEANUP_FAILED:
+ default:
+ break;
+ }
+ ret = 1;
+ }
+ break;
+ case ISCSI_LOGOUT_REASON_RECOVERY:
+ switch (cmd->logout_response) {
+ case ISCSI_LOGOUT_SUCCESS:
+ case ISCSI_LOGOUT_CID_NOT_FOUND:
+ case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
+ case ISCSI_LOGOUT_CLEANUP_FAILED:
+ default:
+ break;
+ }
+ ret = 1;
+ break;
+ default:
+ break;
+
+ }
+ return ret;
+}
+
+void iscsit_fail_session(struct iscsi_session *sess)
+{
+ struct iscsi_conn *conn;
+
+ spin_lock_bh(&sess->conn_lock);
+ list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
+ TRACE(TRACE_STATE, "Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
+ conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
+ }
+ spin_unlock_bh(&sess->conn_lock);
+
+ TRACE(TRACE_STATE, "Moving to TARG_SESS_STATE_FAILED.\n");
+ sess->session_state = TARG_SESS_STATE_FAILED;
+}
+
+int iscsit_free_session(struct iscsi_session *sess)
+{
+ u16 conn_count = atomic_read(&sess->nconn);
+ struct iscsi_conn *conn, *conn_tmp = NULL;
+ int is_last;
+
+ spin_lock_bh(&sess->conn_lock);
+ atomic_set(&sess->sleep_on_sess_wait_comp, 1);
+
+ list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
+ conn_list) {
+ if (conn_count == 0)
+ break;
+
+ if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
+ is_last = 1;
+ } else {
+ iscsit_inc_conn_usage_count(conn_tmp);
+ is_last = 0;
+ }
+ iscsit_inc_conn_usage_count(conn);
+
+ spin_unlock_bh(&sess->conn_lock);
+ iscsit_cause_connection_reinstatement(conn, 1);
+ spin_lock_bh(&sess->conn_lock);
+
+ iscsit_dec_conn_usage_count(conn);
+ if (is_last == 0)
+ iscsit_dec_conn_usage_count(conn_tmp);
+
+ conn_count--;
+ }
+
+ if (atomic_read(&sess->nconn)) {
+ spin_unlock_bh(&sess->conn_lock);
+ wait_for_completion(&sess->session_wait_comp);
+ } else
+ spin_unlock_bh(&sess->conn_lock);
+
+ iscsit_close_session(sess);
+ return 0;
+}
+
+void iscsit_stop_session(
+ struct iscsi_session *sess,
+ int session_sleep,
+ int connection_sleep)
+{
+ u16 conn_count = atomic_read(&sess->nconn);
+ struct iscsi_conn *conn, *conn_tmp = NULL;
+ int is_last;
+
+ spin_lock_bh(&sess->conn_lock);
+ if (session_sleep)
+ atomic_set(&sess->sleep_on_sess_wait_comp, 1);
+
+ if (connection_sleep) {
+ list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
+ conn_list) {
+ if (conn_count == 0)
+ break;
+
+ if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
+ is_last = 1;
+ } else {
+ iscsit_inc_conn_usage_count(conn_tmp);
+ is_last = 0;
+ }
+ iscsit_inc_conn_usage_count(conn);
+
+ spin_unlock_bh(&sess->conn_lock);
+ iscsit_cause_connection_reinstatement(conn, 1);
+ spin_lock_bh(&sess->conn_lock);
+
+ iscsit_dec_conn_usage_count(conn);
+ if (is_last == 0)
+ iscsit_dec_conn_usage_count(conn_tmp);
+ conn_count--;
+ }
+ } else {
+ list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
+ iscsit_cause_connection_reinstatement(conn, 0);
+ }
+
+ if (session_sleep && atomic_read(&sess->nconn)) {
+ spin_unlock_bh(&sess->conn_lock);
+ wait_for_completion(&sess->session_wait_comp);
+ } else
+ spin_unlock_bh(&sess->conn_lock);
+}
+
+int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
+{
+ struct iscsi_session *sess;
+ struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
+ struct se_session *se_sess, *se_sess_tmp;
+ int session_count = 0;
+
+ spin_lock_bh(&se_tpg->session_lock);
+ if (tpg->nsessions && !force) {
+ spin_unlock_bh(&se_tpg->session_lock);
+ return -1;
+ }
+
+ list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
+ sess_list) {
+ sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
+
+ spin_lock(&sess->conn_lock);
+ if (atomic_read(&sess->session_fall_back_to_erl0) ||
+ atomic_read(&sess->session_logout) ||
+ (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
+ spin_unlock(&sess->conn_lock);
+ continue;
+ }
+ atomic_set(&sess->session_reinstatement, 1);
+ spin_unlock(&sess->conn_lock);
+ spin_unlock_bh(&se_tpg->session_lock);
+
+ iscsit_free_session(sess);
+ spin_lock_bh(&se_tpg->session_lock);
+
+ session_count++;
+ }
+ spin_unlock_bh(&se_tpg->session_lock);
+
+ TRACE(TRACE_ISCSI, "Released %d iSCSI Session(s) from Target Portal"
+ " Group: %hu\n", session_count, tpg->tpgt);
+ return 0;
+}
+
+MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
+MODULE_VERSION("4.1.x");
+MODULE_AUTHOR("nab@Linux-iSCSI.org");
+MODULE_LICENSE("GPL");
+
+module_init(iscsi_target_init_module);
+module_exit(iscsi_target_cleanup_module);
diff --git a/drivers/target/iscsi/iscsi_target.h b/drivers/target/iscsi/iscsi_target.h
new file mode 100644
index 0000000..5db2dde
--- /dev/null
+++ b/drivers/target/iscsi/iscsi_target.h
@@ -0,0 +1,42 @@
+#ifndef ISCSI_TARGET_H
+#define ISCSI_TARGET_H
+
+extern struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *);
+extern struct iscsi_tiqn *iscsit_get_tiqn(unsigned char *, int);
+extern void iscsit_put_tiqn_for_login(struct iscsi_tiqn *);
+extern struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *);
+extern void iscsit_del_tiqn(struct iscsi_tiqn *);
+extern int iscsit_access_np(struct iscsi_np *, struct iscsi_portal_group *);
+extern int iscsit_deaccess_np(struct iscsi_np *, struct iscsi_portal_group *);
+extern struct iscsi_np *iscsit_add_np(struct __kernel_sockaddr_storage *,
+ char *, int);
+extern int iscsit_reset_np_thread(struct iscsi_np *, struct iscsi_tpg_np *,
+ struct iscsi_portal_group *);
+extern int iscsit_del_np(struct iscsi_np *);
+extern int iscsit_add_reject_from_cmd(u8, int, int, unsigned char *, struct iscsi_cmd *);
+extern int iscsit_logout_closesession(struct iscsi_cmd *, struct iscsi_conn *);
+extern int iscsit_logout_closeconnection(struct iscsi_cmd *, struct iscsi_conn *);
+extern int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *, struct iscsi_conn *);
+extern int iscsit_send_async_msg(struct iscsi_conn *, u16, u8, u8);
+extern int iscsit_send_r2t(struct iscsi_cmd *, struct iscsi_conn *);
+extern int iscsit_build_r2ts_for_cmd(struct iscsi_cmd *, struct iscsi_conn *, int);
+extern void iscsit_thread_get_cpumask(struct iscsi_conn *);
+extern int iscsi_target_tx_thread(void *);
+extern int iscsi_target_rx_thread(void *);
+extern int iscsit_close_connection(struct iscsi_conn *);
+extern int iscsit_close_session(struct iscsi_session *);
+extern void iscsit_fail_session(struct iscsi_session *);
+extern int iscsit_free_session(struct iscsi_session *);
+extern void iscsit_stop_session(struct iscsi_session *, int, int);
+extern int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *, int);
+
+extern struct iscsit_global *iscsit_global;
+extern struct target_fabric_configfs *lio_target_fabric_configfs;
+
+extern struct kmem_cache *lio_dr_cache;
+extern struct kmem_cache *lio_ooo_cache;
+extern struct kmem_cache *lio_cmd_cache;
+extern struct kmem_cache *lio_qr_cache;
+extern struct kmem_cache *lio_r2t_cache;
+
+#endif /*** ISCSI_TARGET_H ***/
diff --git a/drivers/target/iscsi/iscsi_target_core.h b/drivers/target/iscsi/iscsi_target_core.h
new file mode 100644
index 0000000..c7ca0a0
--- /dev/null
+++ b/drivers/target/iscsi/iscsi_target_core.h
@@ -0,0 +1,859 @@
+#ifndef ISCSI_TARGET_CORE_H
+#define ISCSI_TARGET_CORE_H
+
+#include <linux/in.h>
+#include <linux/configfs.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/iscsi_proto.h>
+#include <target/target_core_base.h>
+
+#define ISCSIT_VERSION "v4.1.0-rc1"
+#define ISCSI_MAX_DATASN_MISSING_COUNT 16
+#define ISCSI_TX_THREAD_TCP_TIMEOUT 2
+#define ISCSI_RX_THREAD_TCP_TIMEOUT 2
+#define SECONDS_FOR_ASYNC_LOGOUT 10
+#define SECONDS_FOR_ASYNC_TEXT 10
+#define WHITE_SPACE " \t\v\f\n\r"
+
+/* struct iscsi_node_attrib sanity values */
+#define NA_DATAOUT_TIMEOUT 3
+#define NA_DATAOUT_TIMEOUT_MAX 60
+#define NA_DATAOUT_TIMEOUT_MIX 2
+#define NA_DATAOUT_TIMEOUT_RETRIES 5
+#define NA_DATAOUT_TIMEOUT_RETRIES_MAX 15
+#define NA_DATAOUT_TIMEOUT_RETRIES_MIN 1
+#define NA_NOPIN_TIMEOUT 5
+#define NA_NOPIN_TIMEOUT_MAX 60
+#define NA_NOPIN_TIMEOUT_MIN 3
+#define NA_NOPIN_RESPONSE_TIMEOUT 5
+#define NA_NOPIN_RESPONSE_TIMEOUT_MAX 60
+#define NA_NOPIN_RESPONSE_TIMEOUT_MIN 3
+#define NA_RANDOM_DATAIN_PDU_OFFSETS 0
+#define NA_RANDOM_DATAIN_SEQ_OFFSETS 0
+#define NA_RANDOM_R2T_OFFSETS 0
+#define NA_DEFAULT_ERL 0
+#define NA_DEFAULT_ERL_MAX 2
+#define NA_DEFAULT_ERL_MIN 0
+
+/* struct iscsi_tpg_attrib sanity values */
+#define TA_AUTHENTICATION 1
+#define TA_LOGIN_TIMEOUT 15
+#define TA_LOGIN_TIMEOUT_MAX 30
+#define TA_LOGIN_TIMEOUT_MIN 5
+#define TA_NETIF_TIMEOUT 2
+#define TA_NETIF_TIMEOUT_MAX 15
+#define TA_NETIF_TIMEOUT_MIN 2
+#define TA_GENERATE_NODE_ACLS 0
+#define TA_DEFAULT_CMDSN_DEPTH 16
+#define TA_DEFAULT_CMDSN_DEPTH_MAX 512
+#define TA_DEFAULT_CMDSN_DEPTH_MIN 1
+#define TA_CACHE_DYNAMIC_ACLS 0
+/* Enabled by default in demo mode (generic_node_acls=1) */
+#define TA_DEMO_MODE_WRITE_PROTECT 1
+/* Disabled by default in production mode w/ explict ACLs */
+#define TA_PROD_MODE_WRITE_PROTECT 0
+#define TA_CACHE_CORE_NPS 0
+
+enum tpg_np_network_transport_table {
+ ISCSI_TCP = 0,
+ ISCSI_SCTP_TCP = 1,
+ ISCSI_SCTP_UDP = 2,
+ ISCSI_IWARP_TCP = 3,
+ ISCSI_IWARP_SCTP = 4,
+ ISCSI_INFINIBAND = 5,
+};
+
+/* RFC-3720 7.1.4 Standard Connection State Diagram for a Target */
+enum target_conn_state_table {
+ TARG_CONN_STATE_FREE = 0x1,
+ TARG_CONN_STATE_XPT_UP = 0x3,
+ TARG_CONN_STATE_IN_LOGIN = 0x4,
+ TARG_CONN_STATE_LOGGED_IN = 0x5,
+ TARG_CONN_STATE_IN_LOGOUT = 0x6,
+ TARG_CONN_STATE_LOGOUT_REQUESTED = 0x7,
+ TARG_CONN_STATE_CLEANUP_WAIT = 0x8,
+};
+
+/* RFC-3720 7.3.2 Session State Diagram for a Target */
+enum target_sess_state_table {
+ TARG_SESS_STATE_FREE = 0x1,
+ TARG_SESS_STATE_ACTIVE = 0x2,
+ TARG_SESS_STATE_LOGGED_IN = 0x3,
+ TARG_SESS_STATE_FAILED = 0x4,
+ TARG_SESS_STATE_IN_CONTINUE = 0x5,
+};
+
+/* struct iscsi_data_count->type */
+enum data_count_type {
+ ISCSI_RX_DATA = 1,
+ ISCSI_TX_DATA = 2,
+};
+
+/* struct iscsi_datain_req->dr_complete */
+enum datain_req_comp_table {
+ DATAIN_COMPLETE_NORMAL = 1,
+ DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY = 2,
+ DATAIN_COMPLETE_CONNECTION_RECOVERY = 3,
+};
+
+/* struct iscsi_datain_req->recovery */
+enum datain_req_rec_table {
+ DATAIN_WITHIN_COMMAND_RECOVERY = 1,
+ DATAIN_CONNECTION_RECOVERY = 2,
+};
+
+/* struct iscsi_portal_group->state */
+enum tpg_state_table {
+ TPG_STATE_FREE = 0,
+ TPG_STATE_ACTIVE = 1,
+ TPG_STATE_INACTIVE = 2,
+ TPG_STATE_COLD_RESET = 3,
+};
+
+/* struct iscsi_tiqn->tiqn_state */
+enum tiqn_state_table {
+ TIQN_STATE_ACTIVE = 1,
+ TIQN_STATE_SHUTDOWN = 2,
+};
+
+/* struct iscsi_cmd->cmd_flags */
+enum cmd_flags_table {
+ ICF_GOT_LAST_DATAOUT = 0x00000001,
+ ICF_GOT_DATACK_SNACK = 0x00000002,
+ ICF_NON_IMMEDIATE_UNSOLICITED_DATA = 0x00000004,
+ ICF_SENT_LAST_R2T = 0x00000008,
+ ICF_WITHIN_COMMAND_RECOVERY = 0x00000010,
+ ICF_CONTIG_MEMORY = 0x00000020,
+ ICF_ATTACHED_TO_RQUEUE = 0x00000040,
+ ICF_OOO_CMDSN = 0x00000080,
+ ICF_REJECT_FAIL_CONN = 0x00000100,
+};
+
+/* struct iscsi_cmd->i_state */
+enum cmd_i_state_table {
+ ISTATE_NO_STATE = 0,
+ ISTATE_NEW_CMD = 1,
+ ISTATE_DEFERRED_CMD = 2,
+ ISTATE_UNSOLICITED_DATA = 3,
+ ISTATE_RECEIVE_DATAOUT = 4,
+ ISTATE_RECEIVE_DATAOUT_RECOVERY = 5,
+ ISTATE_RECEIVED_LAST_DATAOUT = 6,
+ ISTATE_WITHIN_DATAOUT_RECOVERY = 7,
+ ISTATE_IN_CONNECTION_RECOVERY = 8,
+ ISTATE_RECEIVED_TASKMGT = 9,
+ ISTATE_SEND_ASYNCMSG = 10,
+ ISTATE_SENT_ASYNCMSG = 11,
+ ISTATE_SEND_DATAIN = 12,
+ ISTATE_SEND_LAST_DATAIN = 13,
+ ISTATE_SENT_LAST_DATAIN = 14,
+ ISTATE_SEND_LOGOUTRSP = 15,
+ ISTATE_SENT_LOGOUTRSP = 16,
+ ISTATE_SEND_NOPIN = 17,
+ ISTATE_SENT_NOPIN = 18,
+ ISTATE_SEND_REJECT = 19,
+ ISTATE_SENT_REJECT = 20,
+ ISTATE_SEND_R2T = 21,
+ ISTATE_SENT_R2T = 22,
+ ISTATE_SEND_R2T_RECOVERY = 23,
+ ISTATE_SENT_R2T_RECOVERY = 24,
+ ISTATE_SEND_LAST_R2T = 25,
+ ISTATE_SENT_LAST_R2T = 26,
+ ISTATE_SEND_LAST_R2T_RECOVERY = 27,
+ ISTATE_SENT_LAST_R2T_RECOVERY = 28,
+ ISTATE_SEND_STATUS = 29,
+ ISTATE_SEND_STATUS_BROKEN_PC = 30,
+ ISTATE_SENT_STATUS = 31,
+ ISTATE_SEND_STATUS_RECOVERY = 32,
+ ISTATE_SENT_STATUS_RECOVERY = 33,
+ ISTATE_SEND_TASKMGTRSP = 34,
+ ISTATE_SENT_TASKMGTRSP = 35,
+ ISTATE_SEND_TEXTRSP = 36,
+ ISTATE_SENT_TEXTRSP = 37,
+ ISTATE_SEND_NOPIN_WANT_RESPONSE = 38,
+ ISTATE_SENT_NOPIN_WANT_RESPONSE = 39,
+ ISTATE_SEND_NOPIN_NO_RESPONSE = 40,
+ ISTATE_REMOVE = 41,
+ ISTATE_FREE = 42,
+};
+
+/* Used for iscsi_recover_cmdsn() return values */
+enum recover_cmdsn_ret_table {
+ CMDSN_ERROR_CANNOT_RECOVER = -1,
+ CMDSN_NORMAL_OPERATION = 0,
+ CMDSN_LOWER_THAN_EXP = 1,
+ CMDSN_HIGHER_THAN_EXP = 2,
+};
+
+/* Used for iscsi_handle_immediate_data() return values */
+enum immedate_data_ret_table {
+ IMMEDIDATE_DATA_CANNOT_RECOVER = -1,
+ IMMEDIDATE_DATA_NORMAL_OPERATION = 0,
+ IMMEDIDATE_DATA_ERL1_CRC_FAILURE = 1,
+};
+
+/* Used for iscsi_decide_dataout_action() return values */
+enum dataout_action_ret_table {
+ DATAOUT_CANNOT_RECOVER = -1,
+ DATAOUT_NORMAL = 0,
+ DATAOUT_SEND_R2T = 1,
+ DATAOUT_SEND_TO_TRANSPORT = 2,
+ DATAOUT_WITHIN_COMMAND_RECOVERY = 3,
+};
+
+/* Used for struct iscsi_node_auth->naf_flags */
+enum naf_flags_table {
+ NAF_USERID_SET = 0x01,
+ NAF_PASSWORD_SET = 0x02,
+ NAF_USERID_IN_SET = 0x04,
+ NAF_PASSWORD_IN_SET = 0x08,
+};
+
+/* Used by various struct timer_list to manage iSCSI specific state */
+enum iscsi_timer_flags_table {
+ ISCSI_TF_RUNNING = 0x01,
+ ISCSI_TF_STOP = 0x02,
+ ISCSI_TF_EXPIRED = 0x04,
+};
+
+/* Used for struct iscsi_np->np_flags */
+enum np_flags_table {
+ NPF_IP_NETWORK = 0x00,
+ NPF_SCTP_STRUCT_FILE = 0x01 /* Bugfix */
+};
+
+/* Used for struct iscsi_np->np_thread_state */
+enum np_thread_state_table {
+ ISCSI_NP_THREAD_ACTIVE = 1,
+ ISCSI_NP_THREAD_INACTIVE = 2,
+ ISCSI_NP_THREAD_RESET = 3,
+ ISCSI_NP_THREAD_SHUTDOWN = 4,
+ ISCSI_NP_THREAD_EXIT = 5,
+};
+
+struct iscsi_conn_ops {
+ u8 HeaderDigest; /* [0,1] == [None,CRC32C] */
+ u8 DataDigest; /* [0,1] == [None,CRC32C] */
+ u32 MaxRecvDataSegmentLength; /* [512..2**24-1] */
+ u8 OFMarker; /* [0,1] == [No,Yes] */
+ u8 IFMarker; /* [0,1] == [No,Yes] */
+ u32 OFMarkInt; /* [1..65535] */
+ u32 IFMarkInt; /* [1..65535] */
+};
+
+struct iscsi_sess_ops {
+ char InitiatorName[224];
+ char InitiatorAlias[256];
+ char TargetName[224];
+ char TargetAlias[256];
+ char TargetAddress[256];
+ u16 TargetPortalGroupTag; /* [0..65535] */
+ u16 MaxConnections; /* [1..65535] */
+ u8 InitialR2T; /* [0,1] == [No,Yes] */
+ u8 ImmediateData; /* [0,1] == [No,Yes] */
+ u32 MaxBurstLength; /* [512..2**24-1] */
+ u32 FirstBurstLength; /* [512..2**24-1] */
+ u16 DefaultTime2Wait; /* [0..3600] */
+ u16 DefaultTime2Retain; /* [0..3600] */
+ u16 MaxOutstandingR2T; /* [1..65535] */
+ u8 DataPDUInOrder; /* [0,1] == [No,Yes] */
+ u8 DataSequenceInOrder; /* [0,1] == [No,Yes] */
+ u8 ErrorRecoveryLevel; /* [0..2] */
+ u8 SessionType; /* [0,1] == [Normal,Discovery]*/
+};
+
+struct iscsi_queue_req {
+ int state;
+ struct se_obj_lun_type_s *queue_se_obj_api;
+ struct iscsi_cmd *cmd;
+ struct list_head qr_list;
+};
+
+struct iscsi_data_count {
+ int data_length;
+ int sync_and_steering;
+ enum data_count_type type;
+ u32 iov_count;
+ u32 ss_iov_count;
+ u32 ss_marker_count;
+ struct kvec *iov;
+};
+
+struct iscsi_param_list {
+ struct list_head param_list;
+ struct list_head extra_response_list;
+};
+
+struct iscsi_datain_req {
+ enum datain_req_comp_table dr_complete;
+ int generate_recovery_values;
+ enum datain_req_rec_table recovery;
+ u32 begrun;
+ u32 runlength;
+ u32 data_length;
+ u32 data_offset;
+ u32 data_offset_end;
+ u32 data_sn;
+ u32 next_burst_len;
+ u32 read_data_done;
+ u32 seq_send_order;
+ struct list_head dr_list;
+} ____cacheline_aligned;
+
+struct iscsi_ooo_cmdsn {
+ u16 cid;
+ u32 batch_count;
+ u32 cmdsn;
+ u32 exp_cmdsn;
+ struct iscsi_cmd *cmd;
+ struct list_head ooo_list;
+} ____cacheline_aligned;
+
+struct iscsi_datain {
+ u8 flags;
+ u32 data_sn;
+ u32 length;
+ u32 offset;
+} ____cacheline_aligned;
+
+struct iscsi_r2t {
+ int seq_complete;
+ int recovery_r2t;
+ int sent_r2t;
+ u32 r2t_sn;
+ u32 offset;
+ u32 targ_xfer_tag;
+ u32 xfer_len;
+ struct list_head r2t_list;
+} ____cacheline_aligned;
+
+struct iscsi_cmd {
+ enum iscsi_timer_flags_table dataout_timer_flags;
+ /* DataOUT timeout retries */
+ u8 dataout_timeout_retries;
+ /* Within command recovery count */
+ u8 error_recovery_count;
+ /* iSCSI dependent state for out or order CmdSNs */
+ enum cmd_i_state_table deferred_i_state;
+ /* iSCSI dependent state */
+ enum cmd_i_state_table i_state;
+ /* Command is an immediate command (ISCSI_OP_IMMEDIATE set) */
+ u8 immediate_cmd;
+ /* Immediate data present */
+ u8 immediate_data;
+ /* iSCSI Opcode */
+ u8 iscsi_opcode;
+ /* iSCSI Response Code */
+ u8 iscsi_response;
+ /* Logout reason when iscsi_opcode == ISCSI_INIT_LOGOUT_CMND */
+ u8 logout_reason;
+ /* Logout response code when iscsi_opcode == ISCSI_INIT_LOGOUT_CMND */
+ u8 logout_response;
+ /* MaxCmdSN has been incremented */
+ u8 maxcmdsn_inc;
+ /* Immediate Unsolicited Dataout */
+ u8 unsolicited_data;
+ /* CID contained in logout PDU when opcode == ISCSI_INIT_LOGOUT_CMND */
+ u16 logout_cid;
+ /* Command flags */
+ enum cmd_flags_table cmd_flags;
+ /* Initiator Task Tag assigned from Initiator */
+ u32 init_task_tag;
+ /* Target Transfer Tag assigned from Target */
+ u32 targ_xfer_tag;
+ /* CmdSN assigned from Initiator */
+ u32 cmd_sn;
+ /* ExpStatSN assigned from Initiator */
+ u32 exp_stat_sn;
+ /* StatSN assigned to this ITT */
+ u32 stat_sn;
+ /* DataSN Counter */
+ u32 data_sn;
+ /* R2TSN Counter */
+ u32 r2t_sn;
+ /* Last DataSN acknowledged via DataAck SNACK */
+ u32 acked_data_sn;
+ /* Used for echoing NOPOUT ping data */
+ u32 buf_ptr_size;
+ /* Used to store DataDigest */
+ u32 data_crc;
+ /* Total size in bytes associated with command */
+ u32 data_length;
+ /* Counter for MaxOutstandingR2T */
+ u32 outstanding_r2ts;
+ /* Next R2T Offset when DataSequenceInOrder=Yes */
+ u32 r2t_offset;
+ /* Iovec current and orig count for iscsi_cmd->iov_data */
+ u32 iov_data_count;
+ u32 orig_iov_data_count;
+ /* Number of miscellaneous iovecs used for IP stack calls */
+ u32 iov_misc_count;
+ /* Bytes used for 32-bit word padding */
+ u32 pad_bytes;
+ /* Number of struct iscsi_pdu in struct iscsi_cmd->pdu_list */
+ u32 pdu_count;
+ /* Next struct iscsi_pdu to send in struct iscsi_cmd->pdu_list */
+ u32 pdu_send_order;
+ /* Current struct iscsi_pdu in struct iscsi_cmd->pdu_list */
+ u32 pdu_start;
+ u32 residual_count;
+ /* Next struct iscsi_seq to send in struct iscsi_cmd->seq_list */
+ u32 seq_send_order;
+ /* Number of struct iscsi_seq in struct iscsi_cmd->seq_list */
+ u32 seq_count;
+ /* Current struct iscsi_seq in struct iscsi_cmd->seq_list */
+ u32 seq_no;
+ /* Lowest offset in current DataOUT sequence */
+ u32 seq_start_offset;
+ /* Highest offset in current DataOUT sequence */
+ u32 seq_end_offset;
+ /* Total size in bytes received so far of READ data */
+ u32 read_data_done;
+ /* Total size in bytes received so far of WRITE data */
+ u32 write_data_done;
+ /* Counter for FirstBurstLength key */
+ u32 first_burst_len;
+ /* Counter for MaxBurstLength key */
+ u32 next_burst_len;
+ /* Transfer size used for IP stack calls */
+ u32 tx_size;
+ /* Buffer used for various purposes */
+ void *buf_ptr;
+ /* See include/linux/dma-mapping.h */
+ enum dma_data_direction data_direction;
+ /* iSCSI PDU Header + CRC */
+ unsigned char pdu[ISCSI_HDR_LEN + ISCSI_CRC_LEN];
+ /* Number of times struct iscsi_cmd is present in immediate queue */
+ atomic_t immed_queue_count;
+ atomic_t response_queue_count;
+ atomic_t transport_sent;
+ spinlock_t datain_lock;
+ spinlock_t dataout_timeout_lock;
+ /* spinlock for protecting struct iscsi_cmd->i_state */
+ spinlock_t istate_lock;
+ /* spinlock for adding within command recovery entries */
+ spinlock_t error_lock;
+ /* spinlock for adding R2Ts */
+ spinlock_t r2t_lock;
+ /* DataIN List */
+ struct list_head datain_list;
+ /* R2T List */
+ struct list_head cmd_r2t_list;
+ struct completion reject_comp;
+ /* Semaphore used for allocating buffer */
+ struct completion unsolicited_data_comp;
+ /* Timer for DataOUT */
+ struct timer_list dataout_timer;
+ /* Iovecs for SCSI data payload RX/TX w/ kernel level sockets */
+ struct kvec *iov_data;
+ /* Iovecs for miscellaneous purposes */
+#define ISCSI_MISC_IOVECS 5
+ struct kvec iov_misc[ISCSI_MISC_IOVECS];
+ /* Array of struct iscsi_pdu used for DataPDUInOrder=No */
+ struct iscsi_pdu *pdu_list;
+ /* Current struct iscsi_pdu used for DataPDUInOrder=No */
+ struct iscsi_pdu *pdu_ptr;
+ /* Array of struct iscsi_seq used for DataSequenceInOrder=No */
+ struct iscsi_seq *seq_list;
+ /* Current struct iscsi_seq used for DataSequenceInOrder=No */
+ struct iscsi_seq *seq_ptr;
+ /* TMR Request when iscsi_opcode == ISCSI_OP_SCSI_TMFUNC */
+ struct iscsi_tmr_req *tmr_req;
+ /* Connection this command is alligient to */
+ struct iscsi_conn *conn;
+ /* Pointer to connection recovery entry */
+ struct iscsi_conn_recovery *cr;
+ /* Session the command is part of, used for connection recovery */
+ struct iscsi_session *sess;
+ /* Next command in the session pool */
+ struct iscsi_cmd *next;
+ /* list_head for connection list */
+ struct list_head i_list;
+ /* Next command in DAS transport list */
+ struct iscsi_cmd *t_next;
+ /* Previous command in DAS transport list */
+ struct iscsi_cmd *t_prev;
+ /* The TCM I/O descriptor that is accessed via container_of() */
+ struct se_cmd se_cmd;
+ /* Sense buffer that will be mapped into outgoing status */
+#define ISCSI_SENSE_BUFFER_LEN (TRANSPORT_SENSE_BUFFER + 2)
+ unsigned char sense_buffer[ISCSI_SENSE_BUFFER_LEN];
+} ____cacheline_aligned;
+
+#define SE_CMD(cmd) (&(cmd)->se_cmd)
+
+struct iscsi_tmr_req {
+ bool task_reassign:1;
+ u32 ref_cmd_sn;
+ u32 exp_data_sn;
+ struct iscsi_conn_recovery *conn_recovery;
+ struct se_tmr_req *se_tmr_req;
+};
+
+struct iscsi_conn {
+ /* Authentication Successful for this connection */
+ u8 auth_complete;
+ /* State connection is currently in */
+ u8 conn_state;
+ u8 conn_logout_reason;
+ u8 network_transport;
+ enum iscsi_timer_flags_table nopin_timer_flags;
+ enum iscsi_timer_flags_table nopin_response_timer_flags;
+ u8 tx_immediate_queue;
+ u8 tx_response_queue;
+ /* Used to know what thread encountered a transport failure */
+ u8 which_thread;
+ /* connection id assigned by the Initiator */
+ u16 cid;
+ /* Remote TCP Port */
+ u16 login_port;
+ int net_size;
+ u32 auth_id;
+#define CONNFLAG_SCTP_STRUCT_FILE 0x01
+ u32 conn_flags;
+ /* Used for iscsi_tx_login_rsp() */
+ u32 login_itt;
+ u32 exp_statsn;
+ /* Per connection status sequence number */
+ u32 stat_sn;
+ /* IFMarkInt's Current Value */
+ u32 if_marker;
+ /* OFMarkInt's Current Value */
+ u32 of_marker;
+ /* Used for calculating OFMarker offset to next PDU */
+ u32 of_marker_offset;
+ /* Complete Bad PDU for sending reject */
+ unsigned char bad_hdr[ISCSI_HDR_LEN];
+#define IPV6_ADDRESS_SPACE 48
+ unsigned char login_ip[IPV6_ADDRESS_SPACE];
+ int conn_usage_count;
+ int conn_waiting_on_uc;
+ atomic_t check_immediate_queue;
+ atomic_t conn_logout_remove;
+ atomic_t connection_exit;
+ atomic_t connection_recovery;
+ atomic_t connection_reinstatement;
+ atomic_t connection_wait;
+ atomic_t connection_wait_rcfr;
+ atomic_t sleep_on_conn_wait_comp;
+ atomic_t transport_failed;
+ struct completion conn_post_wait_comp;
+ struct completion conn_wait_comp;
+ struct completion conn_wait_rcfr_comp;
+ struct completion conn_waiting_on_uc_comp;
+ struct completion conn_logout_comp;
+ struct completion tx_half_close_comp;
+ struct completion rx_half_close_comp;
+ /* socket used by this connection */
+ struct socket *sock;
+ struct timer_list nopin_timer;
+ struct timer_list nopin_response_timer;
+ struct timer_list transport_timer;
+ /* Spinlock used for add/deleting cmd's from conn_cmd_list */
+ spinlock_t cmd_lock;
+ spinlock_t conn_usage_lock;
+ spinlock_t immed_queue_lock;
+ spinlock_t nopin_timer_lock;
+ spinlock_t response_queue_lock;
+ spinlock_t state_lock;
+ /* libcrypto RX and TX contexts for crc32c */
+ struct hash_desc conn_rx_hash;
+ struct hash_desc conn_tx_hash;
+ /* Used for scheduling TX and RX connection kthreads */
+ cpumask_var_t conn_cpumask;
+ int conn_rx_reset_cpumask:1;
+ int conn_tx_reset_cpumask:1;
+ /* list_head of struct iscsi_cmd for this connection */
+ struct list_head conn_cmd_list;
+ struct list_head immed_queue_list;
+ struct list_head response_queue_list;
+ struct iscsi_conn_ops *conn_ops;
+ struct iscsi_param_list *param_list;
+ /* Used for per connection auth state machine */
+ void *auth_protocol;
+ struct iscsi_login_thread_s *login_thread;
+ struct iscsi_portal_group *tpg;
+ /* Pointer to parent session */
+ struct iscsi_session *sess;
+ /* Pointer to thread_set in use for this conn's threads */
+ struct iscsi_thread_set *thread_set;
+ /* list_head for session connection list */
+ struct list_head conn_list;
+} ____cacheline_aligned;
+
+struct iscsi_conn_recovery {
+ u16 cid;
+ u32 cmd_count;
+ u32 maxrecvdatasegmentlength;
+ int ready_for_reallegiance;
+ struct list_head conn_recovery_cmd_list;
+ spinlock_t conn_recovery_cmd_lock;
+ struct timer_list time2retain_timer;
+ struct iscsi_session *sess;
+ struct list_head cr_list;
+} ____cacheline_aligned;
+
+struct iscsi_session {
+ u8 cmdsn_outoforder;
+ u8 initiator_vendor;
+ u8 isid[6];
+ enum iscsi_timer_flags_table time2retain_timer_flags;
+ u8 version_active;
+ u16 cid_called;
+ u16 conn_recovery_count;
+ u16 tsih;
+ /* state session is currently in */
+ u32 session_state;
+ /* session wide counter: initiator assigned task tag */
+ u32 init_task_tag;
+ /* session wide counter: target assigned task tag */
+ u32 targ_xfer_tag;
+ u32 cmdsn_window;
+ /* session wide counter: expected command sequence number */
+ u32 exp_cmd_sn;
+ /* session wide counter: maximum allowed command sequence number */
+ u32 max_cmd_sn;
+ u32 ooo_cmdsn_count;
+ /* LIO specific session ID */
+ u32 sid;
+ char auth_type[8];
+ /* unique within the target */
+ int session_index;
+ /* Used for session reference counting */
+ int session_usage_count;
+ int session_waiting_on_uc;
+ u32 cmd_pdus;
+ u32 rsp_pdus;
+ u64 tx_data_octets;
+ u64 rx_data_octets;
+ u32 conn_digest_errors;
+ u32 conn_timeout_errors;
+ u64 creation_time;
+ spinlock_t session_stats_lock;
+ /* Number of active connections */
+ atomic_t nconn;
+ atomic_t session_continuation;
+ atomic_t session_fall_back_to_erl0;
+ atomic_t session_logout;
+ atomic_t session_reinstatement;
+ atomic_t session_stop_active;
+ atomic_t sleep_on_sess_wait_comp;
+ atomic_t transport_wait_cmds;
+ /* connection list */
+ struct list_head sess_conn_list;
+ struct list_head cr_active_list;
+ struct list_head cr_inactive_list;
+ spinlock_t cmdsn_lock;
+ spinlock_t conn_lock;
+ spinlock_t cr_a_lock;
+ spinlock_t cr_i_lock;
+ spinlock_t session_usage_lock;
+ spinlock_t ttt_lock;
+ struct list_head sess_ooo_cmdsn_list;
+ struct completion async_msg_comp;
+ struct completion reinstatement_comp;
+ struct completion session_wait_comp;
+ struct completion session_waiting_on_uc_comp;
+ struct timer_list time2retain_timer;
+ struct iscsi_sess_ops *sess_ops;
+ struct se_session *se_sess;
+ struct iscsi_portal_group *tpg;
+} ____cacheline_aligned;
+
+struct iscsi_login {
+ u8 auth_complete;
+ u8 checked_for_existing;
+ u8 current_stage;
+ u8 leading_connection;
+ u8 first_request;
+ u8 version_min;
+ u8 version_max;
+ char isid[6];
+ u32 cmd_sn;
+ u32 init_task_tag;
+ u32 initial_exp_statsn;
+ u32 rsp_length;
+ u16 cid;
+ u16 tsih;
+ char *req;
+ char *rsp;
+ char *req_buf;
+ char *rsp_buf;
+} ____cacheline_aligned;
+
+struct iscsi_node_attrib {
+ u32 dataout_timeout;
+ u32 dataout_timeout_retries;
+ u32 default_erl;
+ u32 nopin_timeout;
+ u32 nopin_response_timeout;
+ u32 random_datain_pdu_offsets;
+ u32 random_datain_seq_offsets;
+ u32 random_r2t_offsets;
+ u32 tmr_cold_reset;
+ u32 tmr_warm_reset;
+ struct iscsi_node_acl *nacl;
+};
+
+struct se_dev_entry_s;
+
+struct iscsi_node_auth {
+ enum naf_flags_table naf_flags;
+ int authenticate_target;
+ /* Used for iscsit_global->discovery_auth,
+ * set to zero (auth disabled) by default */
+ int enforce_discovery_auth;
+#define MAX_USER_LEN 256
+#define MAX_PASS_LEN 256
+ char userid[MAX_USER_LEN];
+ char password[MAX_PASS_LEN];
+ char userid_mutual[MAX_USER_LEN];
+ char password_mutual[MAX_PASS_LEN];
+};
+
+#include "iscsi_target_stat.h"
+
+struct iscsi_node_stat_grps {
+ struct config_group iscsi_sess_stats_group;
+ struct config_group iscsi_conn_stats_group;
+};
+
+struct iscsi_node_acl {
+ struct iscsi_node_attrib node_attrib;
+ struct iscsi_node_auth node_auth;
+ struct iscsi_node_stat_grps node_stat_grps;
+ struct se_node_acl se_node_acl;
+};
+
+#define NODE_STAT_GRPS(nacl) (&(nacl)->node_stat_grps)
+
+#define ISCSI_NODE_ATTRIB(t) (&(t)->node_attrib)
+#define ISCSI_NODE_AUTH(t) (&(t)->node_auth)
+
+struct iscsi_tpg_attrib {
+ u32 authentication;
+ u32 login_timeout;
+ u32 netif_timeout;
+ u32 generate_node_acls;
+ u32 cache_dynamic_acls;
+ u32 default_cmdsn_depth;
+ u32 demo_mode_write_protect;
+ u32 prod_mode_write_protect;
+ struct iscsi_portal_group *tpg;
+};
+
+struct iscsi_np {
+ int np_network_transport;
+ int np_ip_proto;
+ int np_sock_type;
+ enum np_thread_state_table np_thread_state;
+ enum iscsi_timer_flags_table np_login_timer_flags;
+ u32 np_exports;
+ enum np_flags_table np_flags;
+ unsigned char np_ip[IPV6_ADDRESS_SPACE];
+ u16 np_port;
+ spinlock_t np_thread_lock;
+ struct completion np_restart_comp;
+ struct socket *np_socket;
+ struct __kernel_sockaddr_storage np_sockaddr;
+ struct task_struct *np_thread;
+ struct timer_list np_login_timer;
+ struct iscsi_portal_group *np_login_tpg;
+ struct list_head np_list;
+} ____cacheline_aligned;
+
+struct iscsi_tpg_np {
+ struct iscsi_np *tpg_np;
+ struct iscsi_portal_group *tpg;
+ struct iscsi_tpg_np *tpg_np_parent;
+ struct list_head tpg_np_list;
+ struct list_head tpg_np_child_list;
+ struct list_head tpg_np_parent_list;
+ struct se_tpg_np se_tpg_np;
+ spinlock_t tpg_np_parent_lock;
+};
+
+struct iscsi_portal_group {
+ unsigned char tpg_chap_id;
+ /* TPG State */
+ enum tpg_state_table tpg_state;
+ /* Target Portal Group Tag */
+ u16 tpgt;
+ /* Id assigned to target sessions */
+ u16 ntsih;
+ /* Number of active sessions */
+ u32 nsessions;
+ /* Number of Network Portals available for this TPG */
+ u32 num_tpg_nps;
+ /* Per TPG LIO specific session ID. */
+ u32 sid;
+ /* Spinlock for adding/removing Network Portals */
+ spinlock_t tpg_np_lock;
+ spinlock_t tpg_state_lock;
+ struct se_portal_group tpg_se_tpg;
+ struct mutex tpg_access_lock;
+ struct mutex np_login_lock;
+ struct iscsi_tpg_attrib tpg_attrib;
+ /* Pointer to default list of iSCSI parameters for TPG */
+ struct iscsi_param_list *param_list;
+ struct iscsi_tiqn *tpg_tiqn;
+ struct list_head tpg_gnp_list;
+ struct list_head tpg_list;
+} ____cacheline_aligned;
+
+#define ISCSI_TPG_C(c) ((struct iscsi_portal_group *)(c)->tpg)
+#define ISCSI_TPG_LUN(c, l) ((iscsi_tpg_list_t *)(c)->tpg->tpg_lun_list_t[l])
+#define ISCSI_TPG_S(s) ((struct iscsi_portal_group *)(s)->tpg)
+#define ISCSI_TPG_ATTRIB(t) (&(t)->tpg_attrib)
+#define SE_TPG(tpg) (&(tpg)->tpg_se_tpg)
+
+struct iscsi_wwn_stat_grps {
+ struct config_group iscsi_stat_group;
+ struct config_group iscsi_instance_group;
+ struct config_group iscsi_sess_err_group;
+ struct config_group iscsi_tgt_attr_group;
+ struct config_group iscsi_login_stats_group;
+ struct config_group iscsi_logout_stats_group;
+};
+
+struct iscsi_tiqn {
+#define ISCSI_IQN_LEN 224
+ unsigned char tiqn[ISCSI_IQN_LEN];
+ enum tiqn_state_table tiqn_state;
+ int tiqn_access_count;
+ u32 tiqn_active_tpgs;
+ u32 tiqn_ntpgs;
+ u32 tiqn_num_tpg_nps;
+ u32 tiqn_nsessions;
+ struct list_head tiqn_list;
+ struct list_head tiqn_tpg_list;
+ spinlock_t tiqn_state_lock;
+ spinlock_t tiqn_tpg_lock;
+ struct se_wwn tiqn_wwn;
+ struct iscsi_wwn_stat_grps tiqn_stat_grps;
+ int tiqn_index;
+ struct iscsi_sess_err_stats sess_err_stats;
+ struct iscsi_login_stats login_stats;
+ struct iscsi_logout_stats logout_stats;
+} ____cacheline_aligned;
+
+#define WWN_STAT_GRPS(tiqn) (&(tiqn)->tiqn_stat_grps)
+
+struct iscsit_global {
+ /* In core shutdown */
+ u32 in_shutdown;
+ u32 active_ts;
+ /* Unique identifier used for the authentication daemon */
+ u32 auth_id;
+ u32 inactive_ts;
+ /* Thread Set bitmap count */
+ int ts_bitmap_count;
+ /* Thread Set bitmap pointer */
+ unsigned long *ts_bitmap;
+ /* Used for iSCSI discovery session authentication */
+ struct iscsi_node_acl discovery_acl;
+ struct iscsi_portal_group *discovery_tpg;
+};
+
+#endif /* ISCSI_TARGET_CORE_H */
--
1.7.5.1
--
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