Commit d54d35ac authored Oct 04, 2012 by Ed Cashin Committed by Linus Torvalds Oct 06, 2012

aoe: failover remote interface based on aoe_deadsecs parameter



The aoe_deadsecs module parameter allows the user to specify a hard limit
on the number of seconds an AoE command can be retransmitted before the
AoE block device is considered to have failed.

Using aoe_deadsecs to determine the time we try using a different remote
interface helps to ensure that the hard limit is not reached before we've
tried to recover by sending to a different remote port.

As a data storage target, the AoE target is unambiguously identified by
its {major, minor} AoE address tuple, and an AoE target can have multiple
MAC addresses.  However, note that "target" in the driver code and
comments means a {major, minor, MAC address} tuple, as in "somewhere to
send packets".

Signed-off-by: Ed Cashin <ecashin@coraid.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 3f0f0133

drivers/block/aoe/aoe.h

+0 −1

Original line number	Diff line number	Diff line
		@@ -96,7 +96,6 @@ enum {
		TIMERTICK = HZ / 10,
		MINTIMER = HZ >> 2,
		MAXTIMER = HZ << 1,
		HELPWAIT = 20,
		};

		struct buf {

drivers/block/aoe/aoecmd.c

+3 −5

Original line number	Diff line number	Diff line
		@@ -633,11 +633,9 @@ rexmit_timer(ulong vp)
		list_del(pos);

		t = f->t;
		if (n > HELPWAIT) {
		/* see if another target can help */
		if (d->ntargets > 1)
		d->htgt = t;
		}
		if (n > aoe_deadsecs/2)
		d->htgt = t; /* see if another target can help */

		if (t->nout == t->maxout) {
		if (t->maxout > 1)
		t->maxout--;

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