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authorEd Cashin <ecashin@coraid.com>2012-12-17 16:03:29 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-17 17:15:23 -0800
commit1b8a1636ceea573b1d452a1cccf01c990d8d628a (patch)
tree6745e38d43bfbe5496a98af96358de3055fa898c /drivers/block
parent4e78dd144b865162626f811d1097b6d181ec6a31 (diff)
aoe: update cap on outstanding commands based on config query response
The ATA over Ethernet config query response contains a "buffer count" field reflecting the AoE target's capacity to buffer incoming AoE commands. By taking the current value of this field into accound, we increase performance throughput or avoid network congestion, when the value has increased or decreased, respectively. 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.h6
-rw-r--r--drivers/block/aoe/aoecmd.c6
2 files changed, 8 insertions, 4 deletions
diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h
index d2ed7f18d1a..52f75c09724 100644
--- a/drivers/block/aoe/aoe.h
+++ b/drivers/block/aoe/aoe.h
@@ -122,14 +122,14 @@ struct aoeif {
struct aoetgt {
unsigned char addr[6];
- ushort nframes;
+ ushort nframes; /* cap on frames to use */
struct aoedev *d; /* parent device I belong to */
struct list_head ffree; /* list of free frames */
struct aoeif ifs[NAOEIFS];
struct aoeif *ifp; /* current aoeif in use */
ushort nout;
- ushort maxout;
- ulong falloc;
+ ushort maxout; /* current value for max outstanding */
+ ulong falloc; /* number of allocated frames */
ulong lastwadj; /* last window adjustment */
int minbcnt;
int wpkts, rpkts;
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 9fe4f186555..a6e95e69296 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -1373,7 +1373,11 @@ aoecmd_cfg_rsp(struct sk_buff *skb)
spin_lock_irqsave(&d->lock, flags);
t = gettgt(d, h->src);
- if (!t) {
+ if (t) {
+ t->nframes = n;
+ if (n < t->maxout)
+ t->maxout = n;
+ } else {
t = addtgt(d, h->src, n);
if (!t)
goto bail;