linux-kernel - [PATCH 4/7] aoe: allow user to disable target failure timeout

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Message-Id: <551d7117c59f82c9e176f333bee56c59f19c1fa9.1354501189.git.ecashin@coraid.com>
Date:	Mon, 3 Dec 2012 20:46:57 -0500
From:	Ed Cashin <ecashin@...aid.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, ecashin@...aid.com
Subject:  [PATCH 4/7] aoe: allow user to disable target failure timeout

With this change, the aoe driver treats the value zero as special
for the aoe_deadsecs module parameter.  Normally, this value
specifies the number of seconds during which the driver will
continue to attempt retransmits to an unresponsive AoE target.
After aoe_deadsecs has elapsed, the aoe driver marks the aoe
device as "down" and fails all I/O.

The new meaning of an aoe_deadsecs of zero is for the driver to
retransmit commands indefinitely.

Signed-off-by: Ed Cashin <ecashin@...aid.com>
---
 Documentation/aoe/aoe.txt  |    4 +++-
 drivers/block/aoe/aoecmd.c |    4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/Documentation/aoe/aoe.txt b/Documentation/aoe/aoe.txt
index bfc9cb1..c71487d 100644
--- a/Documentation/aoe/aoe.txt
+++ b/Documentation/aoe/aoe.txt
@@ -125,7 +125,9 @@ DRIVER OPTIONS
   The aoe_deadsecs module parameter determines the maximum number of
   seconds that the driver will wait for an AoE device to provide a
   response to an AoE command.  After aoe_deadsecs seconds have
-  elapsed, the AoE device will be marked as "down".
+  elapsed, the AoE device will be marked as "down".  A value of zero
+  is supported for testing purposes and makes the aoe driver keep
+  trying AoE commands forever.
 
   The aoe_maxout module parameter has a default of 128.  This is the
   maximum number of unresponded packets that will be sent to an AoE
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index da360f9..abf4ad2 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -812,7 +812,9 @@ rexmit_timer(ulong vp)
 		since = tsince_hr(f);
 		n = f->waited_total + since;
 		n /= USEC_PER_SEC;
-		if (n > aoe_deadsecs && !(f->flags & FFL_PROBE)) {
+		if (aoe_deadsecs
+		&& n > aoe_deadsecs
+		&& !(f->flags & FFL_PROBE)) {
 			/* Waited too long.  Device failure.
 			 * Hang all frames on first hash bucket for downdev
 			 * to clean up.
-- 
1.7.1

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