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ibft: Expose iBFT acpi header via sysfs

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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>
This commit is contained in:
David Bond
2016-03-23 21:49:26 -04:00
committed by Konrad Rzeszutek Wilk
parent 9a99425f07
commit b3c8eb5038
4 changed files with 150 additions and 1 deletions
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10
Documentation/ABI/testing/sysfs-ibft
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@@ -21,3 +21,13 @@ Contact: Konrad Rzeszutek <ketuzsezr@darnok.org>
Description: The /sys/firmware/ibft/ethernetX directory will contain
files that expose the iSCSI Boot Firmware Table NIC data.
Usually this contains the IP address, MAC, and gateway of the NIC.
What: /sys/firmware/ibft/acpi_header
Date: March 2016
Contact: David Bond <dbond@suse.com>
Description: The /sys/firmware/ibft/acpi_header directory will contain files
that expose the SIGNATURE, OEM_ID, and OEM_TABLE_ID fields of the
acpi table header of the iBFT structure. This will allow for
identification of the creator of the table which is useful in
determining quirks associated with some adapters when used in
hardware vs software iscsi initiator mode.