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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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      Last update: 2007-12-22 18:23    [W:0.084 / U:32.896 seconds]
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