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Subject[PATCH] Add iSCSI IBFT support (v0.4.3)

This patch (v0.4.3) adds /sysfs/firmware/ibft/[initiator|targetX|ethernetX|
extensionX] directories along with text properties which export the the iSCSI
Boot Firmware Table (iBFT) structure.
What is iSCSI Boot Firmware Table? It is a mechanism for the iSCSI
tools to extract from the machine NICs the iSCSI connection information
so that they can automagically mount the iSCSI share/target. Currently
the iSCSI information is hard-coded in the initrd.

For full details of the IBFT structure please take a look at:
ftp://ftp.software.ibm.com/systems/support/system_x_pdf/ibm_iscsi_boot_firmware_table_v1.02.pdf

Please note that this patch depends on the Greg KH patches tree
kobject changes.

Signed-off-by: Konrad Rzeszutek <konradr@linux.vnet.ibm.com>

diff --git a/Documentation/ABI/testing/sysfs-ibft b/Documentation/ABI/testing/sysfs-ibft
new file mode 100644
index 0000000..4898740
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-ibft
@@ -0,0 +1,31 @@
+What: /sys/firmware/ibft/initiator
+Date: November 2007
+Contact: Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+Description: The /sys/firmware/ibft/initiator directory will contain
+ files that expose the iSCSI Boot Firmware Table initiator data.
+ Usually this contains the Initiator name.
+
+What: /sys/firmware/ibft/targetX
+Date: November 2007
+Contact: Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+Description: The /sys/firmware/ibft/targetX directory will contain
+ files that expose the iSCSI Boot Firmware Table target data.
+ Usually this contains the target's IP address, boot LUN,
+ target name, and what NIC it is associated with. It can also
+ contain the CHAP name (and password), the reverse CHAP
+ name (and password)
+
+What: /sys/firmware/ibft/ethernetX
+Date: November 2007
+Contact: Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+Description: The /sys/firmware/ibft/ethernetX directory will contain
+ files that expose the iSCSI Boot Firmware Table NIC data.
+ This can this can the IP address, MAC, and gateway of the NIC.
+
+What: /sys/firmware/ibft/extensionX
+Date: November 2007
+Contact: Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+Description: The /sys/firmware/ibft/extensionX directory will contain
+ files that expose the iSCSI Boot Firmware Table extension data.
+ The extended data structure is not supported so there would be
+ no files in this directory.
diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c
index e1e18c3..32900df 100644
--- a/arch/x86/kernel/setup_32.c
+++ b/arch/x86/kernel/setup_32.c
@@ -39,6 +39,7 @@ #include <linux/module.h>
#include <linux/efi.h>
#include <linux/init.h>
#include <linux/edd.h>
+#include <linux/iscsi_ibft.h>
#include <linux/nodemask.h>
#include <linux/kexec.h>
#include <linux/crash_dump.h>
@@ -148,6 +149,20 @@ static inline void copy_edd(void)
}
#endif

+#if defined(CONFIG_ISCSI_IBFT_FIND)
+static void __init reserve_ibft_region(void)
+{
+ unsigned int ibft_len;
+
+ ibft_len = find_ibft();
+ if (ibft_len)
+ reserve_bootmem((unsigned int)ibft_phys,
+ PAGE_ALIGN(ibft_len));
+}
+#else
+static void __init reserve_ibft_region(void) { }
+#endif
+
int __initdata user_defined_memmap = 0;

/*
@@ -496,6 +511,8 @@ #ifdef CONFIG_BLK_DEV_INITRD
}
#endif
reserve_crashkernel();
+
+ reserve_ibft_region();
}

/*
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index 30d94d1..307fb99 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -33,6 +33,7 @@ #include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/kallsyms.h>
#include <linux/edd.h>
+#include <linux/iscsi_ibft.h>
#include <linux/mmzone.h>
#include <linux/kexec.h>
#include <linux/cpufreq.h>
@@ -198,6 +199,20 @@ static inline void copy_edd(void)
}
#endif

+#if defined(CONFIG_ISCSI_IBFT_FIND)
+static void __init reserve_ibft_region(void)
+{
+ unsigned int ibft_len;
+
+ ibft_len = find_ibft();
+ if (ibft_len)
+ reserve_bootmem_generic((unsigned long)ibft_phys,
+ PAGE_ALIGN(ibft_len));
+}
+#else
+static void __init reserve_ibft_region(void) { }
+#endif
+
#ifdef CONFIG_KEXEC
static void __init reserve_crashkernel(void)
{
@@ -403,6 +418,9 @@ #ifdef CONFIG_BLK_DEV_INITRD
}
#endif
reserve_crashkernel();
+
+ reserve_ibft_region();
+
paging_init();

#ifdef CONFIG_PCI
diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 05f02a3..e2f7208 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -93,4 +93,23 @@ config DMIID
information from userspace through /sys/class/dmi/id/ or if you want
DMI-based module auto-loading.

+config ISCSI_IBFT_FIND
+ bool "iSCSI Boot Firmware Table Attributes"
+ default n
+ help
+ This option enables the kernel to find the region of memory
+ in which the ISCSI Boot Firmware Table (iBFT) resides. This
+ is necessary for iSCSI Boot Firmware Table Attributes module to work
+ properly.
+
+config ISCSI_IBFT
+ tristate "iSCSI Boot Firmware Table Attributes module"
+ depends on ISCSI_IBFT_FIND
+ default n
+ help
+ This option enables support for detection and exposing of iSCSI
+ Boot Firmware Table (iBFT) via sysfs to userspace. If you wish to
+ detect iSCSI boot parameters dynamically during system boot, say Y.
+ Otherwise, say N.
+
endmenu
diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile
index 8d4ebc8..4c91471 100644
--- a/drivers/firmware/Makefile
+++ b/drivers/firmware/Makefile
@@ -8,3 +8,5 @@ obj-$(CONFIG_EFI_PCDP) += pcdp.o
obj-$(CONFIG_DELL_RBU) += dell_rbu.o
obj-$(CONFIG_DCDBAS) += dcdbas.o
obj-$(CONFIG_DMIID) += dmi-id.o
+obj-$(CONFIG_ISCSI_IBFT_FIND) += iscsi_ibft_find.o
+obj-$(CONFIG_ISCSI_IBFT) += iscsi_ibft.o
diff --git a/drivers/firmware/iscsi_ibft.c b/drivers/firmware/iscsi_ibft.c
new file mode 100644
index 0000000..90cb9de
--- /dev/null
+++ b/drivers/firmware/iscsi_ibft.c
@@ -0,0 +1,927 @@
+/*
+ * Copyright 2007 Red Hat, Inc.
+ * by Peter Jones <pjones@redhat.com>
+ * Copyright 2007 IBM, Inc.
+ * by Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ *
+ * This code exposes the iSCSI Boot Format Table to userland via sysfs.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License v2.0 as published by
+ * the Free Software Foundation
+ *
+ * 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.
+ *
+ * Changelog:
+ *
+ * 21 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ * Updated kobject registration, combined unregister functions in one
+ * and code and style cleanup. (v0.4.3)
+ *
+ * 5 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ * Added end-markers to enums and re-organized kobject registration. (v0.4.2)
+ *
+ * 4 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ * Created 'device' sysfs link to the NIC and style cleanup. (v0.4.1)
+ *
+ * 28 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ * Added sysfs-ibft documentation, moved 'find_ibft' function to
+ * in its own file and added text attributes for every struct field. (v0.4)
+ *
+ * 21 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ * Added text attributes emulating OpenFirmware /proc/device-tree naming.
+ * Removed binary /sysfs interface (v0.3)
+ *
+ * 29 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ * Added functionality in setup.c to reserve iBFT region. (v0.2)
+ *
+ * 27 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ * First version exposing iBFT data via a binary /sysfs. (v0.1)
+ *
+ */
+
+
+#include <linux/blkdev.h>
+#include <linux/ctype.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/iscsi_ibft.h>
+#include <linux/limits.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#define IBFT_ISCSI_VERSION "0.4.3"
+#define IBFT_ISCSI_DATE "2007-Dec-21"
+
+MODULE_AUTHOR("Peter Jones <pjones@redhat.com> and \
+Konrad Rzeszutek <konradr@us.ibm.com>");
+MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(IBFT_ISCSI_VERSION);
+
+
+struct ibft_table_header {
+ char signature[4];
+ u32 length;
+ u8 revision;
+ u8 checksum;
+ char oem_id[6];
+ char oem_table_id[8];
+ char reserved[24];
+} __attribute__((__packed__));
+
+struct ibft_hdr {
+ u8 id;
+ u8 version;
+ u16 length;
+ u8 index;
+ u8 flags;
+} __attribute__((__packed__));
+
+struct ibft_control {
+ struct ibft_hdr hdr;
+ u16 extensions;
+ u16 initiator_off;
+ u16 nic0_off;
+ u16 tgt0_off;
+ u16 nic1_off;
+ u16 tgt1_off;
+} __attribute__((__packed__));
+
+struct ibft_initiator {
+ struct ibft_hdr hdr;
+ char isns_server[16];
+ char slp_server[16];
+ char pri_radius_server[16];
+ char sec_radius_server[16];
+ u16 initiator_name_len;
+ u16 initiator_name_off;
+} __attribute__((__packed__));
+
+struct ibft_nic {
+ struct ibft_hdr hdr;
+ char ip_addr[16];
+ u8 subnet_mask_prefix;
+ u8 origin;
+ char gateway[16];
+ char primary_dns[16];
+ char secondary_dns[16];
+ char dhcp[16];
+ u16 vlan;
+ char mac[6];
+ u16 pci_bdf;
+ u16 hostname_len;
+ u16 hostname_off;
+} __attribute__((__packed__));
+
+struct ibft_tgt {
+ struct ibft_hdr hdr;
+ char ip_addr[16];
+ u16 port;
+ char lun[8];
+ u8 chap_type;
+ u8 nic_assoc;
+ u16 tgt_name_len;
+ u16 tgt_name_off;
+ u16 chap_name_len;
+ u16 chap_name_off;
+ u16 chap_secret_len;
+ u16 chap_secret_off;
+ u16 rev_chap_name_len;
+ u16 rev_chap_name_off;
+ u16 rev_chap_secret_len;
+ u16 rev_chap_secret_off;
+} __attribute__((__packed__));
+
+/*
+ * The kobject different types and its names.
+ *
+*/
+enum ibft_id {
+ id_reserved = 0, /* Should never show up */
+ id_control = 1, /* Ditto */
+ id_initiator = 2,
+ id_nic = 3,
+ id_target = 4,
+ id_extensions, /* We don't support. */
+};
+
+static const char *ibft_id_names[] =
+ {"reserved", "control", "initiator", "ethernet%d",
+ "target%d", "extension%d", NULL};
+
+/*
+ * The text attributes names for each of the kobjects.
+*/
+enum ibft_eth_properties_enum {
+ ibft_eth_index,
+ ibft_eth_flags,
+ ibft_eth_ip_addr,
+ ibft_eth_subnet_mask,
+ ibft_eth_origin,
+ ibft_eth_gateway,
+ ibft_eth_primary_dns,
+ ibft_eth_secondary_dns,
+ ibft_eth_dhcp,
+ ibft_eth_vlan,
+ ibft_eth_mac,
+ /* ibft_eth_pci_bdf - this is replaced by link to the device itself. */
+ ibft_eth_hostname,
+ ibft_eth_end_marker,
+};
+
+static const char *ibft_eth_properties[] =
+ {"index", "flags", "ip-addr", "subnet-mask", "origin", "gateway",
+ "primary-dns", "secondary-dns", "dhcp", "vlan", "mac", "hostname",
+ NULL};
+
+enum ibft_tgt_properties_enum {
+ ibft_tgt_index,
+ ibft_tgt_flags,
+ ibft_tgt_ip_addr,
+ ibft_tgt_port,
+ ibft_tgt_lun,
+ ibft_tgt_chap_type,
+ ibft_tgt_nic_assoc,
+ ibft_tgt_name,
+ ibft_tgt_chap_name,
+ ibft_tgt_chap_secret,
+ ibft_tgt_rev_chap_name,
+ ibft_tgt_rev_chap_secret,
+ ibft_tgt_end_marker,
+};
+
+static const char *ibft_tgt_properties[] =
+ {"index", "flags", "ip-addr", "port", "lun", "chap-type", "nic-assoc",
+ "target-name", "chap-name", "chap-secret", "rev-chap-name",
+ "rev-chap-name-secret", NULL};
+
+enum ibft_initiator_properties_enum {
+ ibft_init_index,
+ ibft_init_flags,
+ ibft_init_isns_server,
+ ibft_init_slp_server,
+ ibft_init_pri_radius_server,
+ ibft_init_sec_radius_server,
+ ibft_init_initiator_name,
+ ibft_init_end_marker,
+};
+
+static const char *ibft_initiator_properties[] =
+ {"index", "flags", "isns-server", "slp-server", "pri-radius-server",
+ "sec-radius-server", "initiator-name", NULL};
+
+/*
+ * The kobject and attribute structures.
+ */
+
+struct ibft_kobject {
+ struct ibft_table_header *header;
+ union {
+ struct ibft_initiator *initiator;
+ struct ibft_nic *nic;
+ struct ibft_tgt *tgt;
+ struct ibft_hdr *hdr;
+ };
+ struct kobject kobj;
+ struct list_head node;
+};
+
+struct ibft_attribute {
+ struct attribute attr;
+ ssize_t (*show) (struct ibft_kobject *entry,
+ struct ibft_attribute *attr, char *buf);
+ union {
+ struct ibft_initiator *initiator;
+ struct ibft_nic *nic;
+ struct ibft_tgt *tgt;
+ struct ibft_hdr *hdr;
+ };
+ struct kobject *kobj;
+ int type; /* The enum of the type. This can be any value off:
+ ibft_eth_properties_enum, ibft_tgt_properties_enum,
+ or ibft_initiator_properties_enum. */
+ struct list_head node;
+};
+
+static LIST_HEAD(ibft_attr_list);
+static LIST_HEAD(ibft_kobject_list);
+
+static const char nulls[16];
+static struct ibft_table_header *ibft_device;
+
+/*
+ * Helper functions to parse data properly.
+ */
+static ssize_t sprintf_ipaddr(char *buf, u8 *ip)
+{
+ if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 &&
+ ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 &&
+ ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) {
+ /*
+ * IPV4
+ */
+ return sprintf(buf, "%d.%d.%d.%d\n", ip[12],
+ ip[13], ip[14], ip[15]);
+ } else
+ return 0;
+}
+
+static ssize_t sprintf_string(char *str, int len, char *buf)
+{
+ return sprintf(str, "%.*s\n", len, buf);
+}
+
+/*
+ * Helper function to verify the IBFT header.
+ */
+static int ibft_verify_hdr(struct ibft_hdr *hdr, int id, int length)
+{
+#define IBFT_VERIFY_HDR_FIELD(val, name) \
+ if (hdr->val != val) { \
+ printk(KERN_ERR \
+ "error, in IBFT structure (%s) expected %d but" \
+ " found %d\n", \
+ name, val, hdr->val); \
+ return -ENODEV; \
+ }
+ IBFT_VERIFY_HDR_FIELD(id, "ID");
+ IBFT_VERIFY_HDR_FIELD(length, "Length");
+ return 0;
+}
+
+static void ibft_release(struct kobject *kobj)
+{
+ struct ibft_kobject *ibft =
+ container_of(kobj, struct ibft_kobject, kobj);
+ kfree(ibft);
+}
+
+/*
+ * Routines for reading of the iBFT data in a human readable fashion.
+ */
+ssize_t ibft_attr_show_initiator(struct ibft_kobject *entry,
+ struct ibft_attribute *attr,
+ char *buf)
+{
+ struct ibft_initiator *initiator = entry->initiator;
+ void *ibft_loc = entry->header;
+ char *str = buf;
+
+ if (!initiator)
+ return 0;
+
+ switch (attr->type) {
+ case ibft_init_index:
+ str += sprintf(str, "%d\n", initiator->hdr.index);
+ break;
+ case ibft_init_flags:
+ str += sprintf(str, "%d\n", initiator->hdr.flags);
+ break;
+ case ibft_init_isns_server:
+ str += sprintf_ipaddr(str, initiator->isns_server);
+ break;
+ case ibft_init_slp_server:
+ str += sprintf_ipaddr(str, initiator->slp_server);
+ break;
+ case ibft_init_pri_radius_server:
+ str += sprintf_ipaddr(str, initiator->pri_radius_server);
+ break;
+ case ibft_init_sec_radius_server:
+ str += sprintf_ipaddr(str, initiator->sec_radius_server);
+ break;
+ case ibft_init_initiator_name:
+ str += sprintf_string(str, initiator->initiator_name_len,
+ (char *)ibft_loc +
+ initiator->initiator_name_off);
+ break;
+ default:
+ break;
+ }
+
+ return str - buf;
+}
+
+ssize_t ibft_attr_show_nic(struct ibft_kobject *entry,
+ struct ibft_attribute *attr,
+ char *buf)
+{
+ struct ibft_nic *nic = entry->nic;
+ void *ibft_loc = entry->header;
+ char *str = buf;
+ char *mac;
+ int val;
+
+ if (!nic)
+ return 0;
+
+ switch (attr->type) {
+ case ibft_eth_index:
+ str += sprintf(str, "%d\n", nic->hdr.index);
+ break;
+ case ibft_eth_flags:
+ str += sprintf(str, "%d\n", nic->hdr.flags);
+ break;
+ case ibft_eth_ip_addr:
+ str += sprintf_ipaddr(str, nic->ip_addr);
+ break;
+ case ibft_eth_subnet_mask:
+ val = ~((1 << (32-nic->subnet_mask_prefix))-1);
+ str += sprintf(str, "%d.%d.%d.%d\n",
+ (u8)(val >> 24), (u8)(val >> 16),
+ (u8)(val >> 8), (u8)(val));
+ break;
+ case ibft_eth_origin:
+ str += sprintf(str, "%d\n", nic->origin);
+ break;
+ case ibft_eth_gateway:
+ str += sprintf_ipaddr(str, nic->gateway);
+ break;
+ case ibft_eth_primary_dns:
+ str += sprintf_ipaddr(str, nic->primary_dns);
+ break;
+ case ibft_eth_secondary_dns:
+ str += sprintf_ipaddr(str, nic->secondary_dns);
+ break;
+ case ibft_eth_dhcp:
+ str += sprintf_ipaddr(str, nic->dhcp);
+ break;
+ case ibft_eth_vlan:
+ str += sprintf(str, "%d\n", nic->vlan);
+ break;
+ case ibft_eth_mac:
+ mac = nic->mac;
+ str += sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x\n",
+ (u8)mac[0], (u8)mac[1], (u8)mac[2],
+ (u8)mac[3], (u8)mac[4], (u8)mac[5]);
+ break;
+ case ibft_eth_hostname:
+ str += sprintf_string(str, nic->hostname_len,
+ (char *)ibft_loc + nic->hostname_off);
+ break;
+ default:
+ break;
+ }
+
+ return str - buf;
+};
+
+ssize_t ibft_attr_show_target(struct ibft_kobject *entry,
+ struct ibft_attribute *attr,
+ char *buf)
+{
+ struct ibft_tgt *tgt = entry->tgt;
+ void *ibft_loc = entry->header;
+ char *str = buf;
+ int i;
+
+ if (!tgt)
+ return 0;
+
+ switch (attr->type) {
+ case ibft_tgt_index:
+ str += sprintf(str, "%d\n", tgt->hdr.index);
+ break;
+ case ibft_tgt_flags:
+ str += sprintf(str, "%d\n", tgt->hdr.flags);
+ break;
+ case ibft_tgt_ip_addr:
+ str += sprintf_ipaddr(str, tgt->ip_addr);
+ break;
+ case ibft_tgt_port:
+ str += sprintf(str, "%d\n", tgt->port);
+ break;
+ case ibft_tgt_lun:
+ for (i = 0; i < 8; i++)
+ str += sprintf(str, "%x", (u8)tgt->lun[i]);
+ str += sprintf(str, "\n");
+ break;
+ case ibft_tgt_nic_assoc:
+ str += sprintf(str, "%d\n", tgt->nic_assoc);
+ break;
+ case ibft_tgt_chap_type:
+ str += sprintf(str, "%d\n", tgt->chap_type);
+ break;
+ case ibft_tgt_name:
+ str += sprintf_string(str, tgt->tgt_name_len,
+ (char *)ibft_loc + tgt->tgt_name_off);
+ break;
+ case ibft_tgt_chap_name:
+ str += sprintf_string(str, tgt->chap_name_len,
+ (char *)ibft_loc + tgt->chap_name_off);
+ break;
+ case ibft_tgt_chap_secret:
+ str += sprintf_string(str, tgt->chap_secret_len,
+ (char *)ibft_loc + tgt->chap_secret_off);
+ break;
+ case ibft_tgt_rev_chap_name:
+ str += sprintf_string(str, tgt->rev_chap_name_len,
+ (char *)ibft_loc +
+ tgt->rev_chap_name_off);
+ break;
+ case ibft_tgt_rev_chap_secret:
+ str += sprintf_string(str, tgt->rev_chap_secret_len,
+ (char *)ibft_loc +
+ tgt->rev_chap_secret_off);
+ break;
+ default:
+ break;
+ }
+
+ return str - buf;
+}
+
+/*
+ * The main routine which allows the user to read the IBFT data.
+ */
+static ssize_t ibft_show_attribute(struct kobject *kobj,
+ struct attribute *attr,
+ char *buf)
+{
+ struct ibft_kobject *dev =
+ container_of(kobj, struct ibft_kobject, kobj);
+ struct ibft_attribute *ibft_attr =
+ container_of(attr, struct ibft_attribute, attr);
+ ssize_t ret = -EIO;
+ char *str = buf;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (ibft_attr->show)
+ ret = ibft_attr->show(dev, ibft_attr, str);
+
+ return ret;
+}
+
+static struct sysfs_ops ibft_attr_ops = {
+ .show = ibft_show_attribute,
+};
+
+static struct kobj_type ibft_ktype = {
+ .release = ibft_release,
+ .sysfs_ops = &ibft_attr_ops,
+};
+
+static struct kset *ibft_kset;
+
+static int ibft_alloc_device(void *idev)
+{
+ int len;
+ struct ibft_table_header *hdr;
+
+ if (!idev)
+ return -ENOENT;
+
+ hdr = (struct ibft_table_header *)
+ phys_to_virt((unsigned long)ibft_phys);
+ len = hdr->length;
+
+ ibft_device = kmalloc(len, GFP_KERNEL);
+ if (!ibft_device)
+ return -ENOMEM;
+
+ memcpy(ibft_device, hdr, len);
+
+ return 0;
+}
+
+static void ibft_free_device(struct ibft_table_header *hdr)
+{
+ kfree(hdr);
+}
+
+/*
+ * Helper function for ibft_register_kobjects.
+ */
+static int ibft_create_kobject(struct ibft_table_header *header,
+ struct ibft_hdr *hdr,
+ struct list_head *list)
+{
+ struct ibft_kobject *ibft_kobj = NULL;
+ struct ibft_nic *nic = (struct ibft_nic *)hdr;
+ struct pci_dev *pci_dev;
+ int rc = 0;
+
+ ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
+ if (!ibft_kobj)
+ return -ENOMEM;
+
+ ibft_kobj->header = header;
+ ibft_kobj->hdr = hdr;
+
+ switch (hdr->id) {
+ case id_initiator:
+ rc = ibft_verify_hdr(hdr, id_initiator,
+ sizeof(*ibft_kobj->initiator));
+ break;
+ case id_nic:
+ rc = ibft_verify_hdr(hdr, id_nic,
+ sizeof(*ibft_kobj->nic));
+ break;
+ case id_target:
+ rc = ibft_verify_hdr(hdr, id_target,
+ sizeof(*ibft_kobj->tgt));
+ break;
+ default:
+ /* Extension field which we don't support. Ignore it */
+ break;
+ }
+
+ if (rc) {
+ kfree(ibft_kobj);
+ goto out;
+ }
+
+ /* kobject fief. We will let the reference counter do the job
+ of deleting its name if we fail here. */
+ ibft_kobj->kobj.kset = ibft_kset;
+
+ rc = kobject_init_and_add(&ibft_kobj->kobj, &ibft_ktype,
+ NULL, ibft_id_names[hdr->id], hdr->index);
+
+ if (rc) {
+ kfree(ibft_kobj);
+ goto out;
+ }
+
+ kobject_uevent(&ibft_kobj->kobj, KOBJ_ADD);
+
+ if (hdr->id == id_nic) {
+ pci_dev = pci_get_bus_and_slot((nic->pci_bdf & 0xff00) >> 8,
+ (nic->pci_bdf & 0xff));
+ if (pci_dev) {
+ rc = sysfs_create_link(&ibft_kobj->kobj,
+ &pci_dev->dev.kobj, "device");
+ pci_dev_put(pci_dev);
+ }
+ }
+
+ /* Nothing broke so lets add it to the list. */
+ list_add_tail(&ibft_kobj->node, list);
+out:
+ return rc;
+}
+
+/*
+ * Scan the IBFT table structure for the NIC and Target fields. When
+ * found add them on the passed-in list.
+ */
+static int ibft_register_kobjects(struct ibft_table_header *header,
+ struct list_head *list)
+{
+ struct ibft_control *control = NULL;
+ void *ptr, *end;
+ int rc = 0;
+ u16 offset;
+
+ control = (void *)header + sizeof(*header);
+ end = (void *)control + control->hdr.length;
+
+ for (ptr = &control->initiator_off; ptr < end; ptr += sizeof(u16)) {
+ offset = *(u16 *)ptr;
+ if (offset && offset < header->length) {
+ rc = ibft_create_kobject(header,
+ (void *)header + offset,
+ list);
+ if (rc)
+ break;
+ }
+ }
+
+ return rc;
+}
+
+static void ibft_unregister(struct list_head *attr_list,
+ struct list_head *kobj_list)
+{
+ struct ibft_kobject *data = NULL, *n;
+ struct ibft_attribute *attr = NULL, *m;
+
+ list_for_each_entry_safe(attr, m, attr_list, node) {
+ sysfs_remove_file(attr->kobj, &attr->attr);
+ list_del(&attr->node);
+ kfree(attr);
+ };
+ list_del_init(attr_list);
+
+ list_for_each_entry_safe(data, n, kobj_list, node) {
+ list_del(&data->node);
+ if (data->hdr->id == id_nic)
+ sysfs_remove_link(&data->kobj, "device");
+ kobject_unregister(&data->kobj);
+ };
+ list_del_init(kobj_list);
+}
+
+static int ibft_create_attribute(struct ibft_kobject *kobj_data,
+ int type,
+ const char *name,
+ ssize_t (*show) (struct ibft_kobject *entry,
+ struct ibft_attribute *attr,
+ char *buf),
+ struct list_head *list)
+{
+ struct ibft_attribute *attr = NULL;
+ struct ibft_hdr *hdr = kobj_data->hdr;
+
+ attr = kmalloc(sizeof(*attr), GFP_KERNEL);
+ if (!attr)
+ return -ENOMEM;
+
+ attr->attr.name = name;
+ attr->attr.mode = S_IRUSR;
+ attr->attr.owner = THIS_MODULE;
+
+ attr->hdr = hdr;
+ attr->show = show;
+ attr->kobj = &kobj_data->kobj;
+ attr->type = type;
+
+ list_add_tail(&attr->node, list);
+
+ return 0;
+}
+
+static int ibft_check_nic_for(struct ibft_nic *nic, int entry)
+{
+ int rc = 0;
+
+ switch (entry) {
+ case ibft_eth_index:
+ case ibft_eth_flags:
+ rc = 1;
+ break;
+ case ibft_eth_ip_addr:
+ if (!memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
+ rc = 1;
+ break;
+ case ibft_eth_subnet_mask:
+ if (!memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
+ rc = 1;
+ break;
+ case ibft_eth_origin:
+ rc = 1;
+ break;
+ case ibft_eth_gateway:
+ if (memcmp(nic->gateway, nulls, sizeof(nic->gateway)))
+ rc = 1;
+ break;
+ case ibft_eth_primary_dns:
+ if (memcmp(nic->primary_dns, nulls,
+ sizeof(nic->primary_dns)))
+ rc = 1;
+ break;
+ case ibft_eth_secondary_dns:
+ if (memcmp(nic->secondary_dns, nulls,
+ sizeof(nic->secondary_dns)))
+ rc = 1;
+ break;
+ case ibft_eth_dhcp:
+ if (memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
+ rc = 1;
+ break;
+ case ibft_eth_vlan:
+ case ibft_eth_mac:
+ rc = 1;
+ break;
+ case ibft_eth_hostname:
+ if (nic->hostname_off)
+ rc = 1;
+ break;
+ default:
+ break;
+ }
+
+ return rc;
+}
+
+static int ibft_check_tgt_for(struct ibft_tgt *tgt, int entry)
+{
+ int rc = 0;
+
+ switch (entry) {
+ case ibft_tgt_index:
+ case ibft_tgt_flags:
+ case ibft_tgt_ip_addr:
+ case ibft_tgt_port:
+ case ibft_tgt_lun:
+ case ibft_tgt_nic_assoc:
+ case ibft_tgt_chap_type:
+ rc = 1;
+ case ibft_tgt_name:
+ if (tgt->tgt_name_len)
+ rc = 1;
+ break;
+ case ibft_tgt_chap_name:
+ case ibft_tgt_chap_secret:
+ if (tgt->chap_name_len)
+ rc = 1;
+ break;
+ case ibft_tgt_rev_chap_name:
+ case ibft_tgt_rev_chap_secret:
+ if (tgt->rev_chap_name_len)
+ rc = 1;
+ break;
+ default:
+ break;
+ }
+
+ return rc;
+}
+
+static int ibft_check_initiator_for(struct ibft_initiator *init, int entry)
+{
+ int rc = 0;
+
+ switch (entry) {
+ case ibft_init_index:
+ case ibft_init_flags:
+ rc = 1;
+ break;
+ case ibft_init_isns_server:
+ if (memcmp(init->isns_server, nulls,
+ sizeof(init->isns_server)))
+ rc = 1;
+ break;
+ case ibft_init_slp_server:
+ if (memcmp(init->slp_server, nulls,
+ sizeof(init->slp_server)))
+ rc = 1;
+ break;
+ case ibft_init_pri_radius_server:
+ if (memcmp(init->pri_radius_server, nulls,
+ sizeof(init->pri_radius_server)))
+ rc = 1;
+ break;
+ case ibft_init_sec_radius_server:
+ if (memcmp(init->sec_radius_server, nulls,
+ sizeof(init->sec_radius_server)))
+ rc = 1;
+ break;
+ case ibft_init_initiator_name:
+ if (init->initiator_name_len)
+ rc = 1;
+ break;
+ default:
+ break;
+ }
+
+ return rc;
+}
+
+/*
+ * Register the attributes for all of the kobjects.
+ */
+static int ibft_register_attributes(struct list_head *kobject_list,
+ struct list_head *attr_list)
+{
+ int rc = 0, i = 0;
+ struct ibft_kobject *data = NULL;
+ struct ibft_attribute *attr = NULL, *m;
+
+ list_for_each_entry(data, kobject_list, node) {
+ switch (data->hdr->id) {
+ case id_nic:
+ for (i = 0; i < ibft_eth_end_marker && !rc; i++)
+ if (ibft_check_nic_for(data->nic, i))
+ rc = ibft_create_attribute(data, i,
+ ibft_eth_properties[i],
+ ibft_attr_show_nic, attr_list);
+ break;
+ case id_target:
+ for (i = 0; i < ibft_tgt_end_marker && !rc; i++)
+ if (ibft_check_tgt_for(data->tgt, i))
+ rc = ibft_create_attribute(data, i,
+ ibft_tgt_properties[i],
+ ibft_attr_show_target,
+ attr_list);
+ break;
+ case id_initiator:
+ for (i = 0; i < ibft_init_end_marker && !rc; i++)
+ if (ibft_check_initiator_for(
+ data->initiator, i))
+ rc = ibft_create_attribute(data, i,
+ ibft_initiator_properties[i],
+ ibft_attr_show_initiator,
+ attr_list);
+ break;
+ default:
+ break;
+ }
+ if (rc)
+ break;
+ }
+ list_for_each_entry_safe(attr, m, attr_list, node) {
+ rc = sysfs_create_file(attr->kobj, &attr->attr);
+ if (rc) {
+ list_del(&attr->node);
+ kfree(attr);
+ break;
+ }
+ }
+
+ return rc;
+}
+
+/*
+ * ibft_init() - creates sysfs tree entries for iBFT data.
+ */
+static int __init ibft_init(void)
+{
+ int rc = 0;
+
+ if (!ibft_phys)
+ find_ibft();
+
+ ibft_kset = kset_create_and_add("ibft", NULL, firmware_kobj);
+ if (!ibft_kset)
+ return -ENOMEM;
+
+ if (ibft_phys) {
+ printk(KERN_INFO "iBFT detected at 0x%p.\n", ibft_phys);
+
+ rc = ibft_alloc_device(ibft_phys);
+ if (rc)
+ goto out_firmware_unregister;
+
+ /* Scan the IBFT for data and register kobjects. */
+ rc = ibft_register_kobjects(ibft_device, &ibft_kobject_list);
+ if (rc)
+ goto out_free;
+
+ /* Register the attributes */
+ rc = ibft_register_attributes(&ibft_kobject_list,
+ &ibft_attr_list);
+ if (rc)
+ goto out_free;
+ } else
+ printk(KERN_INFO "No iBFT detected.\n");
+
+ return 0;
+
+out_free:
+ ibft_unregister(&ibft_attr_list, &ibft_kobject_list);
+ ibft_free_device(ibft_device);
+out_firmware_unregister:
+ kset_unregister(ibft_kset);
+ return rc;
+}
+
+static void __exit ibft_exit(void)
+{
+ ibft_unregister(&ibft_attr_list, &ibft_kobject_list);
+ ibft_free_device(ibft_device);
+ kset_unregister(ibft_kset);
+}
+
+module_init(ibft_init);
+module_exit(ibft_exit);
diff --git a/drivers/firmware/iscsi_ibft_find.c b/drivers/firmware/iscsi_ibft_find.c
new file mode 100644
index 0000000..d40cc25
--- /dev/null
+++ b/drivers/firmware/iscsi_ibft_find.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2007 Red Hat, Inc.
+ * by Peter Jones <pjones@redhat.com>
+ * Copyright 2007 IBM, Inc.
+ * by Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ *
+ * This code finds the iSCSI Boot Format Table.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License v2.0 as published by
+ * the Free Software Foundation
+ *
+ * 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/blkdev.h>
+#include <linux/ctype.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/limits.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+
+/*
+ * Physical location of iSCSI Boot Format Table.
+ */
+void *ibft_phys;
+EXPORT_SYMBOL(ibft_phys);
+
+#define IBFT_SIGN "iBFT"
+#define IBFT_SIGN_LEN 4
+#define IBFT_START 0x80000 /* 512kB */
+#define IBFT_END 0x100000 /* 1MB */
+#define VGA_MEM 0xA0000 /* VGA buffer */
+#define VGA_SIZE 0x20000 /* 128kB */
+
+
+/*
+ * Routine used to find the iSCSI Boot Format Table. the physical
+ * location is set in the ibft_phys variable. The return value is
+ * the size of IBFT.
+ */
+ssize_t find_ibft(void)
+{
+ unsigned long pos;
+
+ for (pos = IBFT_START; pos < IBFT_END; pos += 16) {
+ void *virt;
+ /* The table can't be inside the VGA BIOS reserved space,
+ * so skip that area */
+ if (pos == VGA_MEM)
+ pos += VGA_SIZE;
+ virt = phys_to_virt(pos);
+ if (memcmp(virt, IBFT_SIGN, IBFT_SIGN_LEN) == 0) {
+ unsigned long *addr =
+ (unsigned long *)phys_to_virt(pos + 4);
+ unsigned int len = *addr;
+ /* if the length of the table extends past 1M,
+ * the table cannot be valid. */
+ if (pos + len <= (IBFT_END-1)) {
+ ibft_phys = (void *)pos;
+ return len;
+ }
+ }
+ }
+ return 0;
+}
+EXPORT_SYMBOL(find_ibft);
diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
diff --git a/include/linux/iscsi_ibft.h b/include/linux/iscsi_ibft.h
new file mode 100644
index 0000000..d36ca16
--- /dev/null
+++ b/include/linux/iscsi_ibft.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2007 Red Hat, Inc.
+ * by Peter Jones <pjones@redhat.com>
+ * Copyright 2007 IBM, Inc.
+ * by Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ *
+ * This code exposes the iSCSI Boot Format Table to userland via sysfs.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License v2.0 as published by
+ * the Free Software Foundation
+ *
+ * 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.
+ */
+
+#ifndef ISCSI_IBFT_H
+#define ISCSI_IBFT_H
+
+#if defined(CONFIG_ISCSI_IBFT_FIND)
+
+/*
+ * Physical location of iSCSI Boot Format Table.
+ */
+extern void *ibft_phys;
+
+/*
+ * Routine used to find the iSCSI Boot Format Table. The physical
+ * location is set in the ibft_phys variable. The return value is the
+ * size of IBFT.
+ */
+extern ssize_t find_ibft(void);
+
+#endif
+
+#endif /* ISCSI_IBFT_H */

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