netdev - [PATCH net-next 3/9] net/mlx4_en: Pad ethernet packets smaller than 17 bytes

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Date:	Thu, 27 Feb 2014 14:27:00 +0200
From:	Amir Vadai <amirv@...lanox.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, Yevgeny Petrilin <yevgenyp@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Eugenia Emantayev <eugenia@...lanox.com>,
	Amir Vadai <amirv@...lanox.com>
Subject: [PATCH net-next 3/9] net/mlx4_en: Pad ethernet packets smaller than 17 bytes

From: Eugenia Emantayev <eugenia@...lanox.com>

Hardware can't accept packets smaller than 17 bytes. Therefore need to pad with
zeros.


Signed-off-by: Amir Vadai <amirv@...lanox.com>
Signed-off-by: Eugenia Emantayev <eugenia@...lanox.com>
Signed-off-by: Amir Vadai <amirv@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx4/en_tx.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index 8dc7637..268cc4a 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -585,12 +585,19 @@ static void build_inline_wqe(struct mlx4_en_tx_desc *tx_desc, struct sk_buff *sk
 	int spc = MLX4_INLINE_ALIGN - CTRL_SIZE - sizeof *inl;
 
 	if (skb->len <= spc) {
-		inl->byte_count = cpu_to_be32(1 << 31 | skb->len);
+		inl->byte_count = cpu_to_be32(1 << 31 |
+					      max_t(typeof(skb->len),
+						    skb->len,
+						    MIN_PKT_LEN));
 		skb_copy_from_linear_data(skb, inl + 1, skb_headlen(skb));
 		if (skb_shinfo(skb)->nr_frags)
 			memcpy(((void *)(inl + 1)) + skb_headlen(skb), fragptr,
 			       skb_frag_size(&skb_shinfo(skb)->frags[0]));
 
+		if (skb->len < MIN_PKT_LEN)
+			memset(((void *)(inl + 1)) + skb->len, 0,
+			       MIN_PKT_LEN - skb->len);
+
 	} else {
 		inl->byte_count = cpu_to_be32(1 << 31 | spc);
 		if (skb_headlen(skb) <= spc) {
-- 
1.8.3.4

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