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authorEd Cashin <ecashin@coraid.com>2012-12-17 16:03:51 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-17 17:15:24 -0800
commit3fc9b032489d365957ce531d32e225b2d0b3ed11 (patch)
tree4e3ba6f0c3e89d98cede84bec580230b410cd0e1 /drivers/block
parent5f0c9c48e7265039c3f945aaf44a1c6ae8adbd01 (diff)
downloadlinaro-lsk-3fc9b032489d365957ce531d32e225b2d0b3ed11.tar.gz
aoe: commands in retransmit queue use new destination on failure
When one remote MAC address isn't working as a destination for AoE commands, the frames used to track information associated with the AoE commands are moved to a new aoetgt (defined by the tuple of {AoE major, AoE minor, target MAC address}). This patch makes sure that the frames on the queue for retransmits that need to be done are updated to use the new destination, so that retransmits will be sent through a working network path. Without this change, packets on the retransmit queue will be needlessly retransmitted to the unresponsive destination MAC, possibly causing premature target failure before there's time for the retransmit timer to run again, decide to retransmit again, and finally update the destination to a working MAC address on the AoE target. 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>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/aoe/aoe.h1
-rw-r--r--drivers/block/aoe/aoecmd.c75
-rw-r--r--drivers/block/aoe/aoedev.c32
3 files changed, 75 insertions, 33 deletions
diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h
index 9fb68fc3b28..c253cca4985 100644
--- a/drivers/block/aoe/aoe.h
+++ b/drivers/block/aoe/aoe.h
@@ -108,6 +108,7 @@ struct frame {
struct timeval sent; /* high-res time packet was sent */
u32 sent_jiffs; /* low-res jiffies-based sent time */
ulong waited;
+ ulong waited_total;
struct aoetgt *t; /* parent target I belong to */
sector_t lba;
struct sk_buff *skb; /* command skb freed on module exit */
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index a99220ad626..d9bc6ff56f4 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -352,6 +352,7 @@ aoecmd_ata_rw(struct aoedev *d)
fhash(f);
t->nout++;
f->waited = 0;
+ f->waited_total = 0;
f->buf = buf;
f->bcnt = bcnt;
f->lba = buf->sector;
@@ -556,46 +557,69 @@ ejectif(struct aoetgt *t, struct aoeif *ifp)
dev_put(nd);
}
+static struct frame *
+reassign_frame(struct list_head *pos)
+{
+ struct frame *f;
+ struct frame *nf;
+ struct sk_buff *skb;
+
+ f = list_entry(pos, struct frame, head);
+ nf = newframe(f->t->d);
+ if (!nf)
+ return NULL;
+
+ list_del(pos);
+
+ skb = nf->skb;
+ nf->skb = f->skb;
+ nf->buf = f->buf;
+ nf->bcnt = f->bcnt;
+ nf->lba = f->lba;
+ nf->bv = f->bv;
+ nf->bv_off = f->bv_off;
+ nf->waited = 0;
+ nf->waited_total = f->waited_total;
+ nf->sent = f->sent;
+ f->skb = skb;
+ aoe_freetframe(f);
+ f->t->nout--;
+ nf->t->nout++;
+
+ return nf;
+}
+
static int
sthtith(struct aoedev *d)
{
struct frame *f, *nf;
struct list_head *nx, *pos, *head;
- struct sk_buff *skb;
struct aoetgt *ht = d->htgt;
int i;
+ /* look through the active and pending retransmit frames */
for (i = 0; i < NFACTIVE; i++) {
head = &d->factive[i];
list_for_each_safe(pos, nx, head) {
f = list_entry(pos, struct frame, head);
if (f->t != ht)
continue;
-
- nf = newframe(d);
+ nf = reassign_frame(pos);
if (!nf)
return 0;
-
- /* remove frame from active list */
- list_del(pos);
-
- /* reassign all pertinent bits to new outbound frame */
- skb = nf->skb;
- nf->skb = f->skb;
- nf->buf = f->buf;
- nf->bcnt = f->bcnt;
- nf->lba = f->lba;
- nf->bv = f->bv;
- nf->bv_off = f->bv_off;
- nf->waited = 0;
- nf->sent_jiffs = f->sent_jiffs;
- f->skb = skb;
- aoe_freetframe(f);
- ht->nout--;
- nf->t->nout++;
resend(d, nf);
}
}
+ head = &d->rexmitq;
+ list_for_each_safe(pos, nx, head) {
+ f = list_entry(pos, struct frame, head);
+ if (f->t != ht)
+ continue;
+ nf = reassign_frame(pos);
+ if (!nf)
+ return 0;
+ resend(d, nf);
+ }
/* We've cleaned up the outstanding so take away his
* interfaces so he won't be used. We should remove him from
* the target array here, but cleaning up a target is
@@ -612,6 +636,7 @@ rexmit_deferred(struct aoedev *d)
struct aoetgt *t;
struct frame *f;
struct list_head *pos, *nx, *head;
+ int since;
head = &d->rexmitq;
list_for_each_safe(pos, nx, head) {
@@ -621,6 +646,9 @@ rexmit_deferred(struct aoedev *d)
continue;
list_del(pos);
t->nout++;
+ since = tsince_hr(f);
+ f->waited += since;
+ f->waited_total += since;
resend(d, f);
}
}
@@ -637,6 +665,7 @@ rexmit_timer(ulong vp)
register long timeout;
ulong flags, n;
int i;
+ int since;
d = (struct aoedev *) vp;
@@ -669,7 +698,8 @@ rexmit_timer(ulong vp)
while (!list_empty(&flist)) {
pos = flist.next;
f = list_entry(pos, struct frame, head);
- n = f->waited += tsince_hr(f);
+ since = tsince_hr(f);
+ n = f->waited_total + since;
n /= USEC_PER_SEC;
if (n > aoe_deadsecs) {
/* Waited too long. Device failure.
@@ -1301,6 +1331,7 @@ aoecmd_ata_id(struct aoedev *d)
fhash(f);
t->nout++;
f->waited = 0;
+ f->waited_total = 0;
/* set up ata header */
ah->scnt = 1;
diff --git a/drivers/block/aoe/aoedev.c b/drivers/block/aoe/aoedev.c
index 3c3aef20810..91f7c99eb2a 100644
--- a/drivers/block/aoe/aoedev.c
+++ b/drivers/block/aoe/aoedev.c
@@ -170,30 +170,40 @@ aoe_failip(struct aoedev *d)
aoe_end_request(d, rq, 0);
}
+static void
+downdev_frame(struct list_head *pos)
+{
+ struct frame *f;
+
+ f = list_entry(pos, struct frame, head);
+ list_del(pos);
+ if (f->buf) {
+ f->buf->nframesout--;
+ aoe_failbuf(f->t->d, f->buf);
+ }
+ aoe_freetframe(f);
+}
+
void
aoedev_downdev(struct aoedev *d)
{
struct aoetgt *t, **tt, **te;
- struct frame *f;
struct list_head *head, *pos, *nx;
struct request *rq;
int i;
d->flags &= ~DEVFL_UP;
- /* clean out active buffers */
+ /* clean out active and to-be-retransmitted buffers */
for (i = 0; i < NFACTIVE; i++) {
head = &d->factive[i];
- list_for_each_safe(pos, nx, head) {
- f = list_entry(pos, struct frame, head);
- list_del(pos);
- if (f->buf) {
- f->buf->nframesout--;
- aoe_failbuf(d, f->buf);
- }
- aoe_freetframe(f);
- }
+ list_for_each_safe(pos, nx, head)
+ downdev_frame(pos);
}
+ head = &d->rexmitq;
+ list_for_each_safe(pos, nx, head)
+ downdev_frame(pos);
+
/* reset window dressings */
tt = d->targets;
te = tt + NTARGETS;