ibft: separate ibft parsing from sysfs interface

Not all iscsi drivers support ibft. For drivers like be2iscsi
that do not but are bootable through a vendor firmware specific
format/process this patch moves the sysfs interface from the ibft code
to a lib module. This then allows userspace tools to search for iscsi boot
info in a common place and in a common format.

ibft iscsi boot info is exported in the same place as it was
before: /sys/firmware/ibft.

vendor/fw boot info gets export in /sys/firmware/iscsi_bootX, where X is the
scsi host number of the HBA. Underneath these parent dirs, the
target, ethernet, and initiator dirs are the same as they were before.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Konrad Rzeszutek Wilk <konrad@kernel.org>
Signed-off-by: Peter Jones <pjones@redhat.com>

drivers/firmware/Kconfig

@@ -122,6 +122,14 @@ config ISCSI_IBFT_FIND
 	  is necessary for iSCSI Boot Firmware Table Attributes module to work
 	  properly.
 
+config ISCSI_BOOT_SYSFS
+	tristate "iSCSI Boot Sysfs Interface"
+	default	n
+	help
+	  This option enables support for exposing iSCSI boot information
+	  via sysfs to userspace. If you wish to export this information,
+	  say Y. Otherwise, say N.
+
 config ISCSI_IBFT
 	tristate "iSCSI Boot Firmware Table Attributes module"
 	depends on ISCSI_IBFT_FIND

drivers/firmware/Makefile

@@ -10,4 +10,5 @@ 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
+obj-$(CONFIG_ISCSI_BOOT_SYSFS)	+= iscsi_boot_sysfs.o
 obj-$(CONFIG_FIRMWARE_MEMMAP)	+= memmap.o

include/linux/iscsi_boot_sysfs.h

+/*
+ * Export the iSCSI boot info to userland via sysfs.
+ *
+ * Copyright (C) 2010 Red Hat, Inc.  All rights reserved.
+ * Copyright (C) 2010 Mike Christie
+ *
+ * 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_BOOT_SYSFS_
+#define _ISCSI_BOOT_SYSFS_
+
+/*
+ * The text attributes names for each of the kobjects.
+*/
+enum iscsi_boot_eth_properties_enum {
+	ISCSI_BOOT_ETH_INDEX,
+	ISCSI_BOOT_ETH_FLAGS,
+	ISCSI_BOOT_ETH_IP_ADDR,
+	ISCSI_BOOT_ETH_SUBNET_MASK,
+	ISCSI_BOOT_ETH_ORIGIN,
+	ISCSI_BOOT_ETH_GATEWAY,
+	ISCSI_BOOT_ETH_PRIMARY_DNS,
+	ISCSI_BOOT_ETH_SECONDARY_DNS,
+	ISCSI_BOOT_ETH_DHCP,
+	ISCSI_BOOT_ETH_VLAN,
+	ISCSI_BOOT_ETH_MAC,
+	/* eth_pci_bdf - this is replaced by link to the device itself. */
+	ISCSI_BOOT_ETH_HOSTNAME,
+	ISCSI_BOOT_ETH_END_MARKER,
+};
+
+enum iscsi_boot_tgt_properties_enum {
+	ISCSI_BOOT_TGT_INDEX,
+	ISCSI_BOOT_TGT_FLAGS,
+	ISCSI_BOOT_TGT_IP_ADDR,
+	ISCSI_BOOT_TGT_PORT,
+	ISCSI_BOOT_TGT_LUN,
+	ISCSI_BOOT_TGT_CHAP_TYPE,
+	ISCSI_BOOT_TGT_NIC_ASSOC,
+	ISCSI_BOOT_TGT_NAME,
+	ISCSI_BOOT_TGT_CHAP_NAME,
+	ISCSI_BOOT_TGT_CHAP_SECRET,
+	ISCSI_BOOT_TGT_REV_CHAP_NAME,
+	ISCSI_BOOT_TGT_REV_CHAP_SECRET,
+	ISCSI_BOOT_TGT_END_MARKER,
+};
+
+enum iscsi_boot_initiator_properties_enum {
+	ISCSI_BOOT_INI_INDEX,
+	ISCSI_BOOT_INI_FLAGS,
+	ISCSI_BOOT_INI_ISNS_SERVER,
+	ISCSI_BOOT_INI_SLP_SERVER,
+	ISCSI_BOOT_INI_PRI_RADIUS_SERVER,
+	ISCSI_BOOT_INI_SEC_RADIUS_SERVER,
+	ISCSI_BOOT_INI_INITIATOR_NAME,
+	ISCSI_BOOT_INI_END_MARKER,
+};
+
+struct attribute_group;
+
+struct iscsi_boot_kobj {
+	struct kobject kobj;
+	struct attribute_group *attr_group;
+	struct list_head list;
+
+	/*
+	 * Pointer to store driver specific info. If set this will
+	 * be freed for the LLD when the kobj release function is called.
+	 */
+	void *data;
+	/*
+	 * Driver specific show function.
+	 *
+	 * The enum of the type. This can be any value of the above
+	 * properties.
+	 */
+	ssize_t (*show) (void *data, int type, char *buf);
+
+	/*
+	 * Drivers specific visibility function.
+	 * The function should return if they the attr should be readable
+	 * writable or should not be shown.
+	 *
+	 * The enum of the type. This can be any value of the above
+	 * properties.
+	 */
+	mode_t (*is_visible) (void *data, int type);
+};
+
+struct iscsi_boot_kset {
+	struct list_head kobj_list;
+	struct kset *kset;
+};
+
+struct iscsi_boot_kobj *
+iscsi_boot_create_initiator(struct iscsi_boot_kset *boot_kset, int index,
+			    void *data,
+			    ssize_t (*show) (void *data, int type, char *buf),
+			    mode_t (*is_visible) (void *data, int type));
+
+struct iscsi_boot_kobj *
+iscsi_boot_create_ethernet(struct iscsi_boot_kset *boot_kset, int index,
+			   void *data,
+			   ssize_t (*show) (void *data, int type, char *buf),
+			   mode_t (*is_visible) (void *data, int type));
+struct iscsi_boot_kobj *
+iscsi_boot_create_target(struct iscsi_boot_kset *boot_kset, int index,
+			 void *data,
+			 ssize_t (*show) (void *data, int type, char *buf),
+			 mode_t (*is_visible) (void *data, int type));
+
+struct iscsi_boot_kset *iscsi_boot_create_kset(const char *set_name);
+struct iscsi_boot_kset *iscsi_boot_create_host_kset(unsigned int hostno);
+void iscsi_boot_destroy_kset(struct iscsi_boot_kset *boot_kset);
+
+#endif