From: Bart Van Assche <bvanassche@acm.org>
Date: Fri, 28 Jun 2013 12:51:26 +0000 (+0200)
Subject: IB/srp: Maintain a single connection per I_T nexus
X-Git-Tag: v3.11-rc1~16^2~1^7~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=96fc248a4c6fe1e5ffac4903b39d2dd5cbe2dc9a;p=pandora-kernel.git

IB/srp: Maintain a single connection per I_T nexus

An SRP target is required to maintain a single connection between
initiator and target.  This means that if the 'add_target' attribute
is used to create a second connection to a target, the first
connection will be logged out and that the SCSI error handler will
kick in.  The SCSI error handler will cause the SRP initiator to
reconnect, which will cause I/O over the second connection to fail.
Avoid such ping-pong behavior by disabling relogins.

If reconnecting manually is necessary, that is possible by deleting
and recreating an rport via sysfs.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Sebastian Riemer <sebastian.riemer@profitbricks.com>
Acked-by: David Dillow <dillowda@ornl.gov>
Signed-off-by: Roland Dreier <roland@purestorage.com>
---

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