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net/mlx5e: FPGA, fix Innova IPsec TX offload data path performance

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At Innova IPsec TX offload data path a special software parser metadata
is used to pass some packet attributes to the hardware, this metadata
is passed using the Ethernet control segment of a WQE (a HW descriptor)
header.

The cited commit might nullify this header, hence the metadata is lost,
this caused a significant performance drop during hw offloading
operation.

Fix by restoring the metadata at the Ethernet control segment in case
it was nullified.

Fixes: 37fdffb217a4 ("net/mlx5: WQ, fixes for fragmented WQ buffers API")
Signed-off-by: Raed Salem <raeds@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Raed Salem 2018-12-17 11:40:06 +02:00 committed by Saeed Mahameed
parent f09bef61f1
commit 82eaa1fa04
1 changed files with 6 additions and 0 deletions
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6
drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
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@ -387,8 +387,14 @@ netdev_tx_t mlx5e_sq_xmit(struct mlx5e_txqsq *sq, struct sk_buff *skb,
num_wqebbs = DIV_ROUND_UP(ds_cnt, MLX5_SEND_WQEBB_NUM_DS);
contig_wqebbs_room = mlx5_wq_cyc_get_contig_wqebbs(wq, pi);
if (unlikely(contig_wqebbs_room < num_wqebbs)) {
#ifdef CONFIG_MLX5_EN_IPSEC
struct mlx5_wqe_eth_seg cur_eth = wqe->eth;
#endif
mlx5e_fill_sq_frag_edge(sq, wq, pi, contig_wqebbs_room);
mlx5e_sq_fetch_wqe(sq, &wqe, &pi);
#ifdef CONFIG_MLX5_EN_IPSEC
wqe->eth = cur_eth;
#endif
}
/* fill wqe */