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authorEd Cashin <ecashin@coraid.com>2012-12-17 16:04:11 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-17 17:15:25 -0800
commit71114ec45f09eb6ef6f9d41c98d4ab6455086e58 (patch)
tree3f25f6e70364656b06387955764cd61e08148d3f /drivers/block/aoe/aoecmd.c
parente52a29326462badd9ceec90a9eb2ac2a8550e02e (diff)
downloadop-kernel-dev-71114ec45f09eb6ef6f9d41c98d4ab6455086e58.zip
op-kernel-dev-71114ec45f09eb6ef6f9d41c98d4ab6455086e58.tar.gz
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 <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>
Diffstat (limited to 'drivers/block/aoe/aoecmd.c')
-rw-r--r--drivers/block/aoe/aoecmd.c50
1 files changed, 35 insertions, 15 deletions
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 000f7fb..da360f9 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);
}
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