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aoe: use dynamic number of remote ports for AoE storage target

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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 <ecashin@coraid.com>
Cc: Jens Axboe <axboe@kernel.dk>
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 2012-12-17 16:04:11 -08:00 committed by Linus Torvalds
parent e52a293264
commit 71114ec45f
4 changed files with 49 additions and 21 deletions
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6
drivers/block/aoe/aoe.h
View File

@ -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];
};

2
drivers/block/aoe/aoeblk.c
View File

@ -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;

50
drivers/block/aoe/aoecmd.c
View File

@ -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);
}

12
drivers/block/aoe/aoedev.c
View File

@ -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 @@ flush(const char __user *str, size_t cnt, int exiting)
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);