[REPOST PATCH] Add iSCSI IBFT support (v0.4)

* [REPOST PATCH] Add iSCSI IBFT support (v0.4)
@ 2007-11-28 23:34 Konrad Rzeszutek
  2007-12-05  0:44 ` darnok
  0 siblings, 1 reply; 11+ messages in thread
From: Konrad Rzeszutek @ 2007-11-28 23:34 UTC (permalink / raw)
  To: linux-kernel
  Cc: pjones, konradr, konradr, greg, randy.dunlap, hpa, lenb,
	mike.anderson, dwm


This patch adds /sysfs/firmware/ibft/[initiator|targetX|ethernetX]
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


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

diff --git a/Documentation/ABI/testing/sysfs-ibft b/Documentation/ABI/testing/sysfs-ibft
new file mode 100644
index 0000000..941ad9f
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-ibft
@@ -0,0 +1,31 @@
+What:		/sys/firmware/ibft/initiator
+Date:		November 2007
+Contact:	Konrad Rzeszutek <konradr@us.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@us.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@us.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@us.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..7c36a28 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 +511,7 @@ #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..d5b73c6 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 +418,7 @@ #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..d2d75e8
--- /dev/null
+++ b/drivers/firmware/iscsi_ibft.c
@@ -0,0 +1,775 @@
+/*
+ *  Copyright 2007 Red Hat, Inc.
+ *  by Peter Jones <pjones@redhat.com>
+ *  Copyright 2007 IBM, Inc.
+ *  by Konrad Rzeszutek <konradr@us.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.
+ */
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/stat.h>
+#include <linux/err.h>
+#include <linux/ctype.h>
+#include <linux/slab.h>
+#include <linux/limits.h>
+#include <linux/device.h>
+#include <linux/pci.h>
+#include <linux/blkdev.h>
+#include <linux/iscsi_ibft.h>
+
+#define IBFT_ISCSI_VERSION  "0.4"
+#define IBFT_ISCSI_DATE	 "2007-Nov-28"
+
+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);
+
+/*
+ * 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"};
+
+/*
+ * 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,
+	ibft_eth_hostname};
+
+static const char *ibft_eth_properties[] =
+	{"index", "flags", "ip-addr", "subnet-mask", "origin", "gateway",
+	"primary-dns", "secondary-dns", "dhcp", "vlan", "mac", "pci-bdf",
+	"hostname"};
+
+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};
+
+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"};
+
+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};
+
+static const char *ibft_initiator_properties[] =
+	{"index", "flags", "isns-server", "slp-server", "pri-radius-server",
+	"sec-radius-server", "initiator-name"};
+
+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");
+#undef IBFT_VERIFY_HDR_FIELD
+	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;
+
+	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:
+		str += sprintf(str, "%d\n", nic->subnet_mask_prefix);
+		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_pci_bdf:
+		str += sprintf(str, "%d:%d:%d\n",
+			(nic->pci_bdf & 0xff00) >> 8,
+			(nic->pci_bdf & 0xf8) >> 3,
+			(nic->pci_bdf & 0x07));
+		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,
+		(void *)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 ktype_ibft = {
+	.release = ibft_release,
+	.sysfs_ops = &ibft_attr_ops,
+};
+
+static decl_subsys(ibft, &ktype_ibft, NULL);
+
+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 = kzalloc(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;
+	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) {
+		kobject_set_name(&ibft_kobj->kobj,
+			ibft_id_names[hdr->id],
+			hdr->index);
+
+		kobj_set_kset_s(ibft_kobj, ibft_subsys);
+
+		rc = kobject_register(&ibft_kobj->kobj);
+		if (!rc)
+			list_add_tail(&ibft_kobj->node, list);
+	}
+	if (rc)
+		kfree(ibft_kobj);
+
+	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_kobjects(struct list_head *list)
+{
+	struct ibft_kobject *data = NULL, *n;
+
+	list_for_each_entry_safe(data, n, list, node) {
+		list_del(&data->node);
+		kobject_unregister(&data->kobj);
+	};
+	list_del_init(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 = kzalloc(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:
+	case ibft_eth_pci_bdf:
+		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_hostname && !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_rev_chap_secret && !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_initiator_name && !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;
+}
+
+static void ibft_unregister_attributes(struct list_head *list)
+{
+	struct ibft_attribute *attr = NULL, *m;
+
+	list_for_each_entry_safe(attr, m, list, node) {
+		sysfs_remove_file(attr->kobj, &attr->attr);
+		list_del(&attr->node);
+		kfree(attr);
+	}
+	list_del_init(list);
+}
+
+/*
+ * ibft_init() - creates sysfs tree entries for iBFT data.
+ */
+static int __init ibft_init(void)
+{
+	int rc = 0;
+
+	if (!ibft_phys)
+		find_ibft();
+
+	rc = firmware_register(&ibft_subsys);
+	if (rc)
+		return rc;
+
+	if (ibft_phys) {
+		printk(KERN_INFO "iBFT detected at 0x%lx.\n",
+		       (unsigned long)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_attributes(&ibft_attr_list);
+	ibft_unregister_kobjects(&ibft_kobject_list);
+	ibft_free_device(ibft_device);
+	ibft_device = NULL;
+out_firmware_unregister:
+	firmware_unregister(&ibft_subsys);
+	return rc;
+}
+
+static void __exit ibft_exit(void)
+{
+	ibft_unregister_attributes(&ibft_attr_list);
+	ibft_unregister_kobjects(&ibft_kobject_list);
+	ibft_free_device(ibft_device);
+	ibft_device = NULL;
+	firmware_unregister(&ibft_subsys);
+}
+
+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..c51685a
--- /dev/null
+++ b/drivers/firmware/iscsi_ibft_find.c
@@ -0,0 +1,78 @@
+/*
+ *  Copyright 2007 Red Hat, Inc.
+ *  by Peter Jones <pjones@redhat.com>
+ *  Copyright 2007 IBM, Inc.
+ *  by Konrad Rzeszutek <konradr@us.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/module.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ctype.h>
+#include <linux/init.h>
+#include <linux/stat.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/limits.h>
+#include <linux/device.h>
+#include <linux/pci.h>
+#include <linux/blkdev.h>
+#include <linux/iscsi_ibft.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/include/linux/iscsi_ibft.h b/include/linux/iscsi_ibft.h
new file mode 100644
index 0000000..420f621
--- /dev/null
+++ b/include/linux/iscsi_ibft.h
@@ -0,0 +1,126 @@
+#ifndef ISCSI_IBFT_H
+#define ISCSI_IBFT_H
+
+/*
+ * 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);
+
+#if defined(CONFIG_ISCSI_IBFT) || defined(CONFIG_ISCSI_IBFT_MODULE)
+
+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 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;
+};
+
+#endif
+
+#endif /* ISCSI_IBFT_H */

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