netdev - Re: [PATCH 10/10] sfc: Support for byte queue limits

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Message-ID: <1322657043.2403.18.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
Date:	Wed, 30 Nov 2011 13:44:03 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	Ben Hutchings <bhutchings@...arflare.com>
Subject: Re: [PATCH 10/10] sfc: Support for byte queue limits

Le lundi 28 novembre 2011 à 18:33 -0800, Tom Herbert a écrit :
> Changes to sfc to use byte queue limits.
> 
> Signed-off-by: Tom Herbert <therbert@...gle.com>
> ---

>  void efx_fini_tx_queue(struct efx_tx_queue *tx_queue)
> @@ -1163,6 +1176,8 @@ static int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue,
>  	/* Pass off to hardware */
>  	efx_nic_push_buffers(tx_queue);
>  
> +	netdev_tx_sent_queue(tx_queue->core_txq, skb->len);
> +
>  	tx_queue->tso_bursts++;
>  	return NETDEV_TX_OK;
>  

Small fix here :

[PATCH net-next] sfc: fix race in efx_enqueue_skb_tso()

As soon as skb is pushed to hardware, it can be completed and freed, so
we should not dereference skb anymore.

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
CC: Tom Herbert <therbert@...gle.com>
CC: Ben Hutchings <bhutchings@...arflare.com>
---
 drivers/net/ethernet/sfc/tx.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c
index ab4c635..e0e00b3 100644
--- a/drivers/net/ethernet/sfc/tx.c
+++ b/drivers/net/ethernet/sfc/tx.c
@@ -1173,11 +1173,11 @@ static int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue,
 			goto mem_err;
 	}
 
+	netdev_tx_sent_queue(tx_queue->core_txq, skb->len);
+
 	/* Pass off to hardware */
 	efx_nic_push_buffers(tx_queue);
 
-	netdev_tx_sent_queue(tx_queue->core_txq, skb->len);
-
 	tx_queue->tso_bursts++;
 	return NETDEV_TX_OK;
 


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