ibft: Expose iBFT acpi header via sysfs

Some ethernet adapter vendors are supplying products which support optional
(payed license) features. On some adapters this includes a hardware iscsi
initiator.  The same adapters in a normal (no extra licenses) mode of
operation can be used as a software iscsi initiator.  In addition, software
iscsi boot initiators are becoming a standard part of many vendors uefi
implementations.  This is creating difficulties during early boot/install
determining the proper configuration method for these adapters when they
are used as a boot device.

The attached patch creates sysfs entries to expose information from the
acpi header of the ibft table.  This information allows for a method to
easily determining if an ibft table was created by a ethernet card's
firmware or the system uefi/bios.  In the case of a hardware initiator this
information in combination with the pci vendor and device id can be used
to ascertain any vendor specific behaviors that need to be accommodated.

Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: David Bond <dbond@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/linux/iscsi_boot_sysfs.h b/include/linux/iscsi_boot_sysfs.h
index 548d55395488..10923d730486 100644
--- a/include/linux/iscsi_boot_sysfs.h
+++ b/include/linux/iscsi_boot_sysfs.h
@@ -64,6 +64,12 @@ enum iscsi_boot_initiator_properties_enum {
 	ISCSI_BOOT_INI_END_MARKER,
 };
 
+enum iscsi_boot_acpitbl_properties_enum {
+	ISCSI_BOOT_ACPITBL_SIGNATURE,
+	ISCSI_BOOT_ACPITBL_OEM_ID,
+	ISCSI_BOOT_ACPITBL_OEM_TABLE_ID,
+};
+
 struct attribute_group;
 
 struct iscsi_boot_kobj {
@@ -127,6 +133,13 @@ iscsi_boot_create_target(struct iscsi_boot_kset *boot_kset, int index,
 			 umode_t (*is_visible) (void *data, int type),
 			 void (*release) (void *data));
 
+struct iscsi_boot_kobj *
+iscsi_boot_create_acpitbl(struct iscsi_boot_kset *boot_kset, int index,
+			  void *data,
+			  ssize_t (*show)(void *data, int type, char *buf),
+			  umode_t (*is_visible)(void *data, int type),
+			  void (*release)(void *data));
+
 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);