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[SCSI] libfc: use ADISC to verify rport login state

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When rport_login is called on an rport that is already thought
to be logged in, use ADISC.  If that fails, redo PLOGI.
This is less disruptive after fabric changes that don't affect
the state of the target.

Implement the sending of ADISC via fc_els_fill.

Add ADISC state to the rport state machine.  This is entered from READY
and returns to READY after successful completion.  If it fails, the rport
is either logged off and deleted or re-does PLOGI.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Joe Eykholt
2009-08-25 14:03:47 -07:00
committed by James Bottomley
parent 68a1750b46
commit 370c3bd05c
3 changed files with 139 additions and 5 deletions
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include/scsi/libfc.h
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@@ -143,6 +143,7 @@ enum fc_rport_state {
RPORT_ST_RTV, /* waiting for RTV completion */
RPORT_ST_READY, /* ready for use */
RPORT_ST_LOGO, /* port logout sent */
RPORT_ST_ADISC, /* Discover Address sent */
RPORT_ST_DELETE, /* port being deleted */
};