diff options
author | Michael Chan <mchan@broadcom.com> | 2006-08-08 04:46:02 (GMT) |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2006-08-08 04:46:02 (GMT) |
commit | 1b2a720506ccf7c30baaeda5d990c29b31e21726 (patch) | |
tree | 5990f56e364077c83563566ed64beae95b855a9f /drivers/net/tg3.h | |
parent | bd37a088596ccdb2b2dd3299e25e333bca7a9a34 (diff) | |
download | linux-1b2a720506ccf7c30baaeda5d990c29b31e21726.tar.xz |
[TG3]: Fix tx race condition
Fix a subtle race condition between tg3_start_xmit() and tg3_tx()
discovered by Herbert Xu <herbert@gondor.apana.org.au>:
CPU0 CPU1
tg3_start_xmit()
if (tx_ring_full) {
tx_lock
tg3_tx()
if (!netif_queue_stopped)
netif_stop_queue()
if (!tx_ring_full)
update_tx_ring
netif_wake_queue()
tx_unlock
}
Even though tx_ring is updated before the if statement in tg3_tx() in
program order, it can be re-ordered by the CPU as shown above. This
scenario can cause the tx queue to be stopped forever if tg3_tx() has
just freed up the entire tx_ring. The possibility of this happening
should be very rare though.
The following changes are made:
1. Add memory barrier to fix the above race condition.
2. Eliminate the private tx_lock altogether and rely solely on
netif_tx_lock. This eliminates one spinlock in tg3_start_xmit()
when the ring is full.
3. Because of 2, use netif_tx_lock in tg3_tx() before calling
netif_wake_queue().
4. Change TX_BUFFS_AVAIL to an inline function with a memory barrier.
Herbert and David suggested using the memory barrier instead of
volatile.
5. Check for the full wake queue condition before getting
netif_tx_lock in tg3_tx(). This reduces the number of unnecessary
spinlocks when the tx ring is full in a steady-state condition.
6. Update version to 3.65.
Signed-off-by: Michael Chan <mchan@broadcom.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/tg3.h')
-rw-r--r-- | drivers/net/tg3.h | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h index ba2c987..3ecf356 100644 --- a/drivers/net/tg3.h +++ b/drivers/net/tg3.h @@ -2079,9 +2079,9 @@ struct tg3 { * lock: Held during reset, PHY access, timer, and when * updating tg3_flags and tg3_flags2. * - * tx_lock: Held during tg3_start_xmit and tg3_tx only - * when calling netif_[start|stop]_queue. - * tg3_start_xmit is protected by netif_tx_lock. + * netif_tx_lock: Held during tg3_start_xmit. tg3_tx holds + * netif_tx_lock when it needs to call + * netif_wake_queue. * * Both of these locks are to be held with BH safety. * @@ -2118,8 +2118,6 @@ struct tg3 { u32 tx_cons; u32 tx_pending; - spinlock_t tx_lock; - struct tg3_tx_buffer_desc *tx_ring; struct tx_ring_info *tx_buffers; dma_addr_t tx_desc_mapping; |