From: Hannes Reinecke <hare@suse.de>
To: Himanshu Madhani <himanshu.madhani@qlogic.com>, jbottomley@parallels.com
Cc: hch@lst.de, giridhar.malavali@qlogic.com,
andrew.vasquez@qlogic.com, linux-scsi@vger.kernel.org,
target-devel@vger.kernel.org
Subject: Re: [PATCH v2 5/8] qla2xxx: added sess generations to detect RSCN update races
Date: Mon, 27 Jul 2015 10:16:12 +0200 [thread overview]
Message-ID: <55B5E8CC.9030107@suse.de> (raw)
In-Reply-To: <1436904049-27707-6-git-send-email-himanshu.madhani@qlogic.com>
On 07/14/2015 10:00 PM, Himanshu Madhani wrote:
> From: Alexei Potashnik <alexei@purestorage.com>
>
> RSCN processing in qla2xxx driver can run in parallel with ELS/IO
> processing. As such the decision to remove disappeared fc port's
> session could be stale, because a new login sequence has occurred
> since and created a brand new session.
>
> Previous mechanism of dealing with this by delaying deletion request
> was prone to erroneous deletions if the event that was supposed to
> cancel the deletion never arrived or has been delayed in processing.
>
> New mechanism relies on a time-like generation counter to serialize
> RSCN updates relative to ELS/IO updates.
>
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Alexei Potashnik <alexei@purestorage.com>
> Signed-off-by: Himanshu Madhani <himanshu.madhani@qlogic.com>
> ---
Reviewed-by: Hannes Reinecke <hare@suse.com>
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@suse.de +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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next prev parent reply other threads:[~2015-07-27 8:16 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-14 20:00 [PATCH v2 0/8] qla2xxx: Updates for Target Mode driver Himanshu Madhani
2015-07-14 20:00 ` [PATCH v2 1/8] qla2xxx: kill sessions/log out initiator on RSCN and port down events Himanshu Madhani
2015-07-27 8:09 ` Hannes Reinecke
2015-07-27 18:09 ` Roland Dreier
2015-07-28 5:54 ` Hannes Reinecke
2015-07-14 20:00 ` [PATCH v2 2/8] qla2xxx: cleanup cmd in qla workqueue before processing TMR Himanshu Madhani
2015-07-27 8:11 ` Hannes Reinecke
2015-07-14 20:00 ` [PATCH v2 3/8] qla2xxx: delay plogi/prli ack until existing sessions are deleted Himanshu Madhani
2015-07-27 8:14 ` Hannes Reinecke
2015-07-14 20:00 ` [PATCH v2 4/8] qla2xxx: Abort stale cmds on qla_tgt_wq when plogi arrives Himanshu Madhani
2015-07-27 8:14 ` Hannes Reinecke
2015-07-14 20:00 ` [PATCH v2 5/8] qla2xxx: added sess generations to detect RSCN update races Himanshu Madhani
2015-07-27 8:16 ` Hannes Reinecke [this message]
2015-07-14 20:00 ` [PATCH v2 6/8] qla2xxx: disable scsi_transport_fc registration in target mode Himanshu Madhani
2015-07-27 8:17 ` Hannes Reinecke
2015-07-14 20:00 ` [PATCH v2 7/8] qla2xxx: drop cmds/tmrs arrived while session is being deleted Himanshu Madhani
2015-07-27 8:17 ` Hannes Reinecke
2015-07-14 20:00 ` [PATCH v2 8/8] qla2xxx: terminate exchange when command is aborted by LIO Himanshu Madhani
2015-07-27 8:18 ` Hannes Reinecke
2015-07-24 7:38 ` [PATCH v2 0/8] qla2xxx: Updates for Target Mode driver Nicholas A. Bellinger
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