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net/mlx5e: IPoIB, handle RX packet correctly

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IPoIB packet contains the pseudo header area, we need to pull it prior
to reset_mac_header in order to let the GRO work well.

In more details:
GRO checks the mac address of the new coming packet, it does that by
comparing the hard_header_len size of the current packet to the previous
one in that session, the comparison is over hard_header_len size.
Now, the driver prepares that area in the skb by allocating area from the
reserved part and resetting the correct mac header to it.

Fixes: 9d6bd752c6 ("net/mlx5e: IPoIB, RX handler")
Signed-off-by: Erez Shitrit <erezsh@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Erez Shitrit 2017-04-27 17:59:00 +03:00 committed by Saeed Mahameed
parent e3ca4e0583
commit b57fe69196
1 changed files with 7 additions and 1 deletions
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8
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
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@ -1041,6 +1041,8 @@ void mlx5e_free_xdpsq_descs(struct mlx5e_xdpsq *sq)
#define MLX5_IB_GRH_BYTES 40
#define MLX5_IPOIB_ENCAP_LEN 4
#define MLX5_GID_SIZE 16
#define MLX5_IPOIB_PSEUDO_LEN 20
#define MLX5_IPOIB_HARD_LEN (MLX5_IPOIB_PSEUDO_LEN + MLX5_IPOIB_ENCAP_LEN)
static inline void mlx5i_complete_rx_cqe(struct mlx5e_rq *rq,
struct mlx5_cqe64 *cqe,
@ -1048,6 +1050,7 @@ static inline void mlx5i_complete_rx_cqe(struct mlx5e_rq *rq,
struct sk_buff *skb)
{
struct net_device *netdev = rq->netdev;
char *pseudo_header;
u8 *dgid;
u8 g;
@ -1076,8 +1079,11 @@ static inline void mlx5i_complete_rx_cqe(struct mlx5e_rq *rq,
if (likely(netdev->features & NETIF_F_RXHASH))
mlx5e_skb_set_hash(cqe, skb);
/* 20 bytes of ipoib header and 4 for encap existing */
pseudo_header = skb_push(skb, MLX5_IPOIB_PSEUDO_LEN);
memset(pseudo_header, 0, MLX5_IPOIB_PSEUDO_LEN);
skb_reset_mac_header(skb);
skb_pull(skb, MLX5_IPOIB_ENCAP_LEN);
skb_pull(skb, MLX5_IPOIB_HARD_LEN);
skb->dev = netdev;