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[SCSI] FC Pass Thru support

Attached is the ELS/CT pass-thru patch for the FC Transport. The patch
creates a generic framework that lays on top of bsg and the SGIO v4 ioctl
in order to pass transaction requests to LLDD's.

The interface supports the following operations:
  On an fc_host basis:
    Request login to the specified N_Port_ID, creating an fc_rport.
    Request logout of the specified N_Port_ID, deleting an fc_rport
    Send ELS request to specified N_Port_ID w/o requiring a login, and
      wait for ELS response.
    Send CT request to specified N_Port_ID and wait for CT response.
      Login is required, but LLDD is allowed to manage login and decide
      whether it stays in place after the request is satisfied.
    Vendor-Unique request. Allows a LLDD-specific request to be passed
      to the LLDD, and the passing of a response back to the application.
  On an fc_rport basis:
    Send ELS request to nport and wait for ELS response.
    Send CT request to nport and wait for CT response.

The patch also exports several headers from include/scsi such that
they can be available to user-space applications:
  include/scsi/scsi.h
  include/scsi/scsi_netlink.h
  include/scsi/scsi_netlink_fc.h
  include/scsi/scsi_bsg_fc.h

For further information, refer to the last RFC:
http://marc.info/?l=linux-scsi&m=123436574018579&w=2

Note: Documentation is still spotty and will be added later.

[bharrosh@panasas.com: update for new block API]
Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
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1 parent e349792 commit 9e4f5e29610162fd426366f3b29e3cc6e575b858 James Smart committed with James Bottomley Mar 26, 2009
@@ -1,10 +1,11 @@
SCSI FC Tansport
=============================================
-Date: 4/12/2007
+Date: 11/18/2008
Kernel Revisions for features:
rports : <<TBS>>
- vports : 2.6.22 (? TBD)
+ vports : 2.6.22
+ bsg support : 2.6.30 (?TBD?)
Introduction
@@ -15,6 +16,7 @@ The FC transport can be found at:
drivers/scsi/scsi_transport_fc.c
include/scsi/scsi_transport_fc.h
include/scsi/scsi_netlink_fc.h
+ include/scsi/scsi_bsg_fc.h
This file is found at Documentation/scsi/scsi_fc_transport.txt
@@ -472,6 +474,14 @@ int
fc_vport_terminate(struct fc_vport *vport)
+FC BSG support (CT & ELS passthru, and more)
+========================================================================
+<< To Be Supplied >>
+
+
+
+
+
Credits
=======
The following people have contributed to this document:
@@ -1271,6 +1271,11 @@ of interest:
hostdata[0] - area reserved for LLD at end of struct Scsi_Host. Size
is set by the second argument (named 'xtr_bytes') to
scsi_host_alloc() or scsi_register().
+ vendor_id - a unique value that identifies the vendor supplying
+ the LLD for the Scsi_Host. Used most often in validating
+ vendor-specific message requests. Value consists of an
+ identifier type and a vendor-specific value.
+ See scsi_netlink.h for a description of valid formats.
The scsi_host structure is defined in include/scsi/scsi_host.h
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