netdev - [PATCH] sky2: Account for VLAN tag in tx_le

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Date:	Sat, 12 Sep 2009 12:17:29 +0900
From:	Mike McCormack <mikem@...g3k.org>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
CC:	netdev@...r.kernel.org
Subject: [PATCH] sky2: Account for VLAN tag in tx_le_req

With VLAN enabled, tx_le_req would return on less list elements than required,
 leading to a potential wrap around of the transmit ring buffer.

Signed-off-by: Mike McCormack <mikem@...g3k.org>
---
 drivers/net/sky2.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 00bc65a..018aa58 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -66,7 +66,7 @@
 
 /* This is the worst case number of transmit list elements for a single skb:
    VLAN + TSO + CKSUM + Data + skb_frags * DMA */
-#define MAX_SKB_TX_LE	(4 + (sizeof(dma_addr_t)/sizeof(u32))*MAX_SKB_FRAGS)
+#define MAX_SKB_TX_LE	(5 + (sizeof(dma_addr_t)/sizeof(u32))*MAX_SKB_FRAGS)
 #define TX_MIN_PENDING		(MAX_SKB_TX_LE+1)
 #define TX_MAX_PENDING		4096
 #define TX_DEF_PENDING		127
@@ -1576,6 +1576,11 @@ static unsigned tx_le_req(const struct sk_buff *skb)
 	if (skb->ip_summed == CHECKSUM_PARTIAL)
 		++count;
 
+#ifdef SKY2_VLAN_TAG_USED
+	if (vlan_tx_tag_present(skb))
+		++count;
+#endif
+
 	return count;
 }
 
-- 
1.5.6.5


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