netdev - [PATCH] chelsio: add headroom in RX path

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Message-ID: <1363797199.3333.18.camel@edumazet-glaptop>
Date:	Wed, 20 Mar 2013 09:33:19 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>
Subject: [PATCH] chelsio: add headroom in RX path

From: Eric Dumazet <edumazet@...gle.com>

Drivers should reserve some headroom in skb used in receive path,
to avoid future head reallocation.

One possible way to do that is to use dev_alloc_skb() instead
of alloc_skb(), so that NET_SKB_PAD bytes are reserved.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 drivers/net/ethernet/chelsio/cxgb/sge.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb/sge.c b/drivers/net/ethernet/chelsio/cxgb/sge.c
index 4829769..89bef50 100644
--- a/drivers/net/ethernet/chelsio/cxgb/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb/sge.c
@@ -835,7 +835,7 @@ static void refill_free_list(struct sge *sge, struct freelQ *q)
 		struct sk_buff *skb;
 		dma_addr_t mapping;
 
-		skb = alloc_skb(q->rx_buffer_size, GFP_ATOMIC);
+		skb = dev_alloc_skb(q->rx_buffer_size);
 		if (!skb)
 			break;
 


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