diff options
| author | Ed Cashin <ecashin@coraid.com> | 2012-10-05 02:16:25 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-05 20:05:25 +0200 |
| commit | eb086ec59667df5b07d58176e21a5f523ead1d66 (patch) | |
| tree | 85c0fa90b4791659f128518115ca0df4ece88586 /drivers/block/aoe/aoenet.c | |
| parent | aoe: become I/O request queue handler for increased user control (diff) | |
| download | linux-eb086ec59667df5b07d58176e21a5f523ead1d66.tar.xz linux-eb086ec59667df5b07d58176e21a5f523ead1d66.zip | |
aoe: use a kernel thread for transmissions
The dev_queue_xmit function needs to have interrupts enabled, so the most
simple way to get the locking right but still fulfill that requirement is
to use a process that can call dev_queue_xmit serially over queued
transmissions.
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/aoe/aoenet.c')
| -rw-r--r-- | drivers/block/aoe/aoenet.c | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/drivers/block/aoe/aoenet.c b/drivers/block/aoe/aoenet.c index 000eff2b53a8..5f43710601ab 100644 --- a/drivers/block/aoe/aoenet.c +++ b/drivers/block/aoe/aoenet.c @@ -33,6 +33,9 @@ static char aoe_iflist[IFLISTSZ]; module_param_string(aoe_iflist, aoe_iflist, IFLISTSZ, 0600); MODULE_PARM_DESC(aoe_iflist, "aoe_iflist=\"dev1 [dev2 ...]\""); +static wait_queue_head_t txwq; +static struct ktstate kts; + #ifndef MODULE static int __init aoe_iflist_setup(char *str) { @@ -44,6 +47,23 @@ static int __init aoe_iflist_setup(char *str) __setup("aoe_iflist=", aoe_iflist_setup); #endif +static spinlock_t txlock; +static struct sk_buff_head skbtxq; + +/* enters with txlock held */ +static int +tx(void) +{ + struct sk_buff *skb; + + while ((skb = skb_dequeue(&skbtxq))) { + spin_unlock_irq(&txlock); + dev_queue_xmit(skb); + spin_lock_irq(&txlock); + } + return 0; +} + int is_aoe_netif(struct net_device *ifp) { @@ -88,10 +108,14 @@ void aoenet_xmit(struct sk_buff_head *queue) { struct sk_buff *skb, *tmp; + ulong flags; skb_queue_walk_safe(queue, skb, tmp) { __skb_unlink(skb, queue); - dev_queue_xmit(skb); + spin_lock_irqsave(&txlock, flags); + skb_queue_tail(&skbtxq, skb); + spin_unlock_irqrestore(&txlock, flags); + wake_up(&txwq); } } @@ -169,6 +193,15 @@ static struct packet_type aoe_pt __read_mostly = { int __init aoenet_init(void) { + skb_queue_head_init(&skbtxq); + init_waitqueue_head(&txwq); + spin_lock_init(&txlock); + kts.lock = &txlock; + kts.fn = tx; + kts.waitq = &txwq; + kts.name = "aoe_tx"; + if (aoe_ktstart(&kts)) + return -EAGAIN; dev_add_pack(&aoe_pt); return 0; } @@ -176,6 +209,8 @@ aoenet_init(void) void aoenet_exit(void) { + aoe_ktstop(&kts); + skb_queue_purge(&skbtxq); dev_remove_pack(&aoe_pt); } |