From 622121719934f60378279eb440d3cec2fc3176d2 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Sat, 25 Feb 2012 00:51:05 +0000
Subject: [PATCH] mlx4_en: dont change mac_header on xmit
A driver xmit function is not allowed to change skb without special
care.
mlx4_en_xmit() should not call skb_reset_mac_header() and instead should
use skb->data to access ethernet header.
This removes a dumb test : if (ethh && ethh->h_dest)
Also remove this slow mlx4_en_mac_to_u64() call, we can use
get_unaligned() to get faster code.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/ethernet/mellanox/mlx4/en_tx.c | 15 +++------------
include/linux/mlx4/qp.h | 5 ++++-
2 files changed, 7 insertions(+), 13 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index ff3250586584..2fd51405a509 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -601,8 +601,6 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
struct skb_frag_struct *frag;
struct mlx4_en_tx_info *tx_info;
struct ethhdr *ethh;
- u64 mac;
- u32 mac_l, mac_h;
int tx_ind = 0;
int nr_txbb;
int desc_size;
@@ -687,16 +685,9 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
}
/* Copy dst mac address to wqe */
- skb_reset_mac_header(skb);
- ethh = eth_hdr(skb);
- if (ethh && ethh->h_dest) {
- mac = mlx4_en_mac_to_u64(ethh->h_dest);
- mac_h = (u32) ((mac & 0xffff00000000ULL) >> 16);
- mac_l = (u32) (mac & 0xffffffff);
- tx_desc->ctrl.srcrb_flags |= cpu_to_be32(mac_h);
- tx_desc->ctrl.imm = cpu_to_be32(mac_l);
- }
-
+ ethh = (struct ethhdr *)skb->data;
+ tx_desc->ctrl.srcrb_flags16[0] = get_unaligned((u16 *)ethh->h_dest);
+ tx_desc->ctrl.imm = get_unaligned((u32 *)(ethh->h_dest + 2));
/* Handle LSO (TSO) packets */
if (lso_header_size) {
/* Mark opcode as LSO */
diff --git a/include/linux/mlx4/qp.h b/include/linux/mlx4/qp.h
index bee8fa231276..091f9e7dc8b9 100644
--- a/include/linux/mlx4/qp.h
+++ b/include/linux/mlx4/qp.h
@@ -212,7 +212,10 @@ struct mlx4_wqe_ctrl_seg {
* [1] SE (solicited event)
* [0] FL (force loopback)
*/
- __be32 srcrb_flags;
+ union {
+ __be32 srcrb_flags;
+ __be16 srcrb_flags16[2];
+ };
/*
* imm is immediate data for send/RDMA write w/ immediate;
* also invalidation key for send with invalidate; input
--
2.34.1