The patch titled
Subject: aoe: failover remote interface based on aoe_deadsecs parameter
has been added to the -mm tree. Its filename is
aoe-failover-remote-interface-based-on-aoe_deadsecs-parameter.patch
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------------------------------------------------------
From: Ed Cashin <ecashin@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/aoe/aoe.h | 1 -
drivers/block/aoe/aoecmd.c | 8 +++-----
2 files changed, 3 insertions(+), 6 deletions(-)
diff -puN drivers/block/aoe/aoe.h~aoe-failover-remote-interface-based-on-aoe_deadsecs-parameter drivers/block/aoe/aoe.h
--- a/drivers/block/aoe/aoe.h~aoe-failover-remote-interface-based-on-aoe_deadsecs-parameter
+++ a/drivers/block/aoe/aoe.h
@@ -96,7 +96,6 @@ enum {
TIMERTICK = HZ / 10,
MINTIMER = HZ >> 2,
MAXTIMER = HZ << 1,
- HELPWAIT = 20,
};
struct buf {
diff -puN drivers/block/aoe/aoecmd.c~aoe-failover-remote-interface-based-on-aoe_deadsecs-parameter drivers/block/aoe/aoecmd.c
--- a/drivers/block/aoe/aoecmd.c~aoe-failover-remote-interface-based-on-aoe_deadsecs-parameter
+++ a/drivers/block/aoe/aoecmd.c
@@ -632,11 +632,9 @@ 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--;
_
Patches currently in -mm which might be from ecashin@xxxxxxxxxx are
aoe-for-performance-support-larger-packet-payloads.patch
aoe-kernel-thread-handles-i-o-completions-for-simple-locking.patch
aoe-become-i-o-request-queue-handler-for-increased-user-control.patch
aoe-use-a-kernel-thread-for-transmissions.patch
aoe-use-packets-that-work-with-the-smallest-mtu-local-interface.patch
aoe-failover-remote-interface-based-on-aoe_deadsecs-parameter.patch
aoe-do-revalidation-steps-in-order.patch
aoe-disallow-unsupported-aoe-minor-addresses.patch
aoe-associate-frames-with-the-aoe-storage-target.patch
aoe-increase-net_device-reference-count-while-using-it.patch
aoe-remove-unused-code-and-add-cosmetic-improvements.patch
aoe-update-internal-version-number-to-49.patch
aoe-update-copyright-year-in-touched-files.patch
aoe-update-documentation-with-new-url-and-vm-settings-reference.patch
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