netdev - [PATCH net 1/2] cxgb4: Fix tx flit calculation

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Message-Id: <1441709740-7533-2-git-send-email-hariprasad@chelsio.com>
Date:	Tue,  8 Sep 2015 16:25:39 +0530
From:	Hariprasad Shenai <hariprasad@...lsio.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, leedom@...lsio.com, nirranjan@...lsio.com,
	Hariprasad Shenai <hariprasad@...lsio.com>
Subject: [PATCH net 1/2] cxgb4: Fix tx flit calculation

In commit 0aac3f56d4a63f04 ("cxgb4: Add comment for calculate tx flits
and sge length code") introduced a regression where tx flit calculation
is going wrong, which can lead to data corruption, hang, stall and
write-combining failure. Fixing it.

Signed-off-by: Hariprasad Shenai <hariprasad@...lsio.com>
---
 drivers/net/ethernet/chelsio/cxgb4/sge.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/sge.c b/drivers/net/ethernet/chelsio/cxgb4/sge.c
index 78f446c..9162746 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/sge.c
@@ -807,7 +807,7 @@ static inline unsigned int calc_tx_flits(const struct sk_buff *skb)
 	 * message or, if we're doing a Large Send Offload, an LSO CPL message
 	 * with an embedded TX Packet Write CPL message.
 	 */
-	flits = sgl_len(skb_shinfo(skb)->nr_frags + 1) + 4;
+	flits = sgl_len(skb_shinfo(skb)->nr_frags + 1);
 	if (skb_shinfo(skb)->gso_size)
 		flits += (sizeof(struct fw_eth_tx_pkt_wr) +
 			  sizeof(struct cpl_tx_pkt_lso_core) +
-- 
2.3.4

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