From 71114ec45f09eb6ef6f9d41c98d4ab6455086e58 Mon Sep 17 00:00:00 2001 From: Ed Cashin Date: Mon, 17 Dec 2012 16:04:11 -0800 Subject: aoe: use dynamic number of remote ports for AoE storage target Many AoE targets have four or fewer network ports, but some existing storage devices have many, and the AoE protocol sets no limit. This patch allows the use of more than eight remote MAC addresses per AoE target, while reducing the amount of memory used by the aoe driver in cases where there are many AoE targets with fewer than eight MAC addresses each. Signed-off-by: Ed Cashin Cc: Jens Axboe Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/block/aoe/aoe.h | 6 +++--- drivers/block/aoe/aoeblk.c | 2 +- drivers/block/aoe/aoecmd.c | 50 ++++++++++++++++++++++++++++++++-------------- drivers/block/aoe/aoedev.c | 12 +++++++++-- 4 files changed, 49 insertions(+), 21 deletions(-) diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h index d50e9455b937..0f478dcfc199 100644 --- a/drivers/block/aoe/aoe.h +++ b/drivers/block/aoe/aoe.h @@ -84,7 +84,7 @@ enum { enum { DEFAULTBCNT = 2 * 512, /* 2 sectors */ MIN_BUFS = 16, - NTARGETS = 8, + NTARGETS = 4, NAOEIFS = 8, NSKBPOOLMAX = 256, NFACTIVE = 61, @@ -185,9 +185,9 @@ struct aoedev { ulong maxbcnt; struct list_head factive[NFACTIVE]; /* hash of active frames */ struct list_head rexmitq; /* deferred retransmissions */ - struct aoetgt *targets[NTARGETS]; + struct aoetgt **targets; + ulong ntargets; /* number of allocated aoetgt pointers */ struct aoetgt **tgt; /* target in use when working */ - ulong ntargets; ulong kicked; char ident[512]; }; diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c index 6b5b7876ecf3..a129f8c8073d 100644 --- a/drivers/block/aoe/aoeblk.c +++ b/drivers/block/aoe/aoeblk.c @@ -67,7 +67,7 @@ static ssize_t aoedisk_show_netif(struct device *dev, nd = nds; ne = nd + ARRAY_SIZE(nds); t = d->targets; - te = t + NTARGETS; + te = t + d->ntargets; for (; t < te && *t; t++) { ifp = (*t)->ifs; e = ifp + NAOEIFS; diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c index 000f7fb48841..da360f95c8ea 100644 --- a/drivers/block/aoe/aoecmd.c +++ b/drivers/block/aoe/aoecmd.c @@ -242,14 +242,14 @@ newframe(struct aoedev *d) int use_tainted; int has_untainted; - if (d->targets[0] == NULL) { /* shouldn't happen, but I'm paranoid */ + if (!d->targets || !d->targets[0]) { printk(KERN_ERR "aoe: NULL TARGETS!\n"); return NULL; } tt = d->tgt; /* last used target */ for (use_tainted = 0, has_untainted = 0;;) { tt++; - if (tt >= &d->targets[NTARGETS] || !*tt) + if (tt >= &d->targets[d->ntargets] || !*tt) tt = d->targets; t = *tt; if (!t->taint) { @@ -1104,7 +1104,7 @@ gettgt(struct aoedev *d, char *addr) struct aoetgt **t, **e; t = d->targets; - e = t + NTARGETS; + e = t + d->ntargets; for (; t < e && *t; t++) if (memcmp((*t)->addr, addr, sizeof((*t)->addr)) == 0) return *t; @@ -1479,28 +1479,44 @@ aoecmd_ata_id(struct aoedev *d) return skb; } +static struct aoetgt ** +grow_targets(struct aoedev *d) +{ + ulong oldn, newn; + struct aoetgt **tt; + + oldn = d->ntargets; + newn = oldn * 2; + tt = kcalloc(newn, sizeof(*d->targets), GFP_ATOMIC); + if (!tt) + return NULL; + memmove(tt, d->targets, sizeof(*d->targets) * oldn); + d->tgt = tt + (d->tgt - d->targets); + kfree(d->targets); + d->targets = tt; + d->ntargets = newn; + + return &d->targets[oldn]; +} + static struct aoetgt * addtgt(struct aoedev *d, char *addr, ulong nframes) { struct aoetgt *t, **tt, **te; tt = d->targets; - te = tt + NTARGETS; + te = tt + d->ntargets; for (; tt < te && *tt; tt++) ; if (tt == te) { - printk(KERN_INFO - "aoe: device addtgt failure; too many targets\n"); - return NULL; + tt = grow_targets(d); + if (!tt) + goto nomem; } t = kzalloc(sizeof(*t), GFP_ATOMIC); - if (!t) { - printk(KERN_INFO "aoe: cannot allocate memory to add target\n"); - return NULL; - } - - d->ntargets++; + if (!t) + goto nomem; t->nframes = nframes; t->d = d; memcpy(t->addr, addr, sizeof t->addr); @@ -1509,6 +1525,10 @@ addtgt(struct aoedev *d, char *addr, ulong nframes) t->maxout = t->nframes / 2; INIT_LIST_HEAD(&t->ffree); return *tt = t; + + nomem: + pr_info("aoe: cannot allocate memory to add target\n"); + return NULL; } static void @@ -1518,7 +1538,7 @@ setdbcnt(struct aoedev *d) int bcnt = 0; t = d->targets; - e = t + NTARGETS; + e = t + d->ntargets; for (; t < e && *t; t++) if (bcnt == 0 || bcnt > (*t)->minbcnt) bcnt = (*t)->minbcnt; @@ -1662,7 +1682,7 @@ aoecmd_cleanslate(struct aoedev *d) d->maxbcnt = 0; t = d->targets; - te = t + NTARGETS; + te = t + d->ntargets; for (; t < te && *t; t++) aoecmd_wreset(*t); } diff --git a/drivers/block/aoe/aoedev.c b/drivers/block/aoe/aoedev.c index 3776715eb255..e66ccbf41a50 100644 --- a/drivers/block/aoe/aoedev.c +++ b/drivers/block/aoe/aoedev.c @@ -214,7 +214,7 @@ aoedev_downdev(struct aoedev *d) /* reset window dressings */ tt = d->targets; - te = tt + NTARGETS; + te = tt + d->ntargets; for (; tt < te && (t = *tt); tt++) { aoecmd_wreset(t); t->nout = 0; @@ -284,7 +284,7 @@ freedev(struct aoedev *d) blk_cleanup_queue(d->blkq); } t = d->targets; - e = t + NTARGETS; + e = t + d->ntargets; for (; t < e && *t; t++) freetgt(d, *t); if (d->bufpool) @@ -376,6 +376,8 @@ restart: dd = &d->next; } spin_unlock(&d->lock); + if (doomed) + kfree(doomed->targets); kfree(doomed); } spin_unlock_irqrestore(&devlist_lock, flags); @@ -456,6 +458,12 @@ aoedev_by_aoeaddr(ulong maj, int min, int do_alloc) d = kcalloc(1, sizeof *d, GFP_ATOMIC); if (!d) goto out; + d->targets = kcalloc(NTARGETS, sizeof(*d->targets), GFP_ATOMIC); + if (!d->targets) { + kfree(d); + goto out; + } + d->ntargets = NTARGETS; INIT_WORK(&d->work, aoecmd_sleepwork); spin_lock_init(&d->lock); skb_queue_head_init(&d->skbpool); -- cgit v1.2.3