From: Ed Cashin Date: Fri, 9 Nov 2012 03:05:16 +0000 (+1100) Subject: aoe: commands in retransmit queue use new destination on failure X-Git-Tag: next-20121112~5^2~9 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f3b8e07af7744cbb;p=karo-tx-linux.git 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. Signed-off-by: Ed Cashin Signed-off-by: Andrew Morton --- diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h index 9fb68fc3b280..c253cca4985b 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 a99220ad6262..d9bc6ff56f49 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 3c3aef208106..91f7c99eb2a9 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;