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aoe: failover remote interface based on aoe_deadsecs parameter

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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>
This commit is contained in:
Ed Cashin 2012-10-04 17:16:29 -07:00 committed by Linus Torvalds
parent 3f0f013374
commit d54d35ac66
2 changed files with 3 additions and 6 deletions
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1
drivers/block/aoe/aoe.h
View file

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

8
drivers/block/aoe/aoecmd.c
View file

@ -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--;