[PATCH] aoe 12/12: send outgoing packets in order
I can't use list.h, since sk_buff doesn't have a list_head but instead
has two struct sk_buff pointers, and I want to avoid any extra memory
allocation.
send outgoing packets in order
Signed-off-by: Ed L. Cashin <ecashin@coraid.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h
index 2e92cfb..aa8b547 100644
--- a/drivers/block/aoe/aoe.h
+++ b/drivers/block/aoe/aoe.h
@@ -131,7 +131,8 @@
struct timer_list timer;
spinlock_t lock;
struct net_device *ifp; /* interface ed is attached to */
- struct sk_buff *skblist;/* packets needing to be sent */
+ struct sk_buff *sendq_hd; /* packets needing to be sent, list head */
+ struct sk_buff *sendq_tl;
mempool_t *bufpool; /* for deadlock-free Buf allocation */
struct list_head bufq; /* queue of bios to work on */
struct buf *inprocess; /* the one we're currently working on */
diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index a2735d9..4780f79 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -147,8 +147,8 @@
list_add_tail(&buf->bufs, &d->bufq);
aoecmd_work(d);
- sl = d->skblist;
- d->skblist = NULL;
+ sl = d->sendq_hd;
+ d->sendq_hd = d->sendq_tl = NULL;
spin_unlock_irqrestore(&d->lock, flags);
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 60beb8d..b5be4b7 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -178,8 +178,12 @@
skb = skb_prepare(d, f);
if (skb) {
- skb->next = d->skblist;
- d->skblist = skb;
+ skb->next = NULL;
+ if (d->sendq_hd)
+ d->sendq_tl->next = skb;
+ else
+ d->sendq_hd = skb;
+ d->sendq_tl = skb;
}
}
@@ -227,8 +231,12 @@
skb = skb_prepare(d, f);
if (skb) {
- skb->next = d->skblist;
- d->skblist = skb;
+ skb->next = NULL;
+ if (d->sendq_hd)
+ d->sendq_tl->next = skb;
+ else
+ d->sendq_hd = skb;
+ d->sendq_tl = skb;
}
}
@@ -280,8 +288,8 @@
}
}
- sl = d->skblist;
- d->skblist = NULL;
+ sl = d->sendq_hd;
+ d->sendq_hd = d->sendq_tl = NULL;
if (sl) {
n = d->rttavg <<= 1;
if (n > MAXTIMER)
@@ -481,8 +489,8 @@
aoecmd_work(d);
- sl = d->skblist;
- d->skblist = NULL;
+ sl = d->sendq_hd;
+ d->sendq_hd = d->sendq_tl = NULL;
spin_unlock_irqrestore(&d->lock, flags);
@@ -531,7 +539,7 @@
/*
* Since we only call this in one place (and it only prepares one frame)
- * we just return the skb. Usually we'd chain it up to the d->skblist.
+ * we just return the skb. Usually we'd chain it up to the aoedev sendq.
*/
static struct sk_buff *
aoecmd_ata_id(struct aoedev *d)
