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net/mlx5: fix legacy inline multi-packet performance

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The legacy multi-packet write is the feature allowing to
put multiple packets into one transmitting descriptor,
this feature is supported by only NIC ConnectX-4LX.
The number of packets should be limited to provide
optimal size descriptor and better performance.

Fixes: 18a1c20044 ("net/mlx5: implement Tx burst template")
Cc: stable@dpdk.org

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>
This commit is contained in:
Viacheslav Ovsiienko 2019-11-27 13:06:16 +00:00 committed by Thomas Monjalon
parent 57725162f0
commit c8a1a172ae
2 changed files with 4 additions and 1 deletions
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1
drivers/net/mlx5/mlx5_prm.h
View File

@ -100,6 +100,7 @@
*/
#define MLX5_EMPW_MAX_PACKETS MLX5_TX_COMP_THRESH
#define MLX5_MPW_MAX_PACKETS 6
#define MLX5_MPW_INLINE_MAX_PACKETS 2
/*
* Default packet length threshold to be inlined with

4
drivers/net/mlx5/mlx5_rxtx.c
View File

@ -4059,7 +4059,9 @@ mlx5_tx_burst_empw_inline(struct mlx5_txq_data *restrict txq,
* Limits the amount of packets in one WQE
* to improve CQE latency generation.
*/
nlim = RTE_MIN(pkts_n, MLX5_EMPW_MAX_PACKETS);
nlim = RTE_MIN(pkts_n, MLX5_TXOFF_CONFIG(MPW) ?
MLX5_MPW_INLINE_MAX_PACKETS :
MLX5_EMPW_MAX_PACKETS);
/* Check whether we have minimal amount WQEs */
if (unlikely(loc->wqe_free <
((2 + MLX5_EMPW_MIN_PACKETS + 3) / 4)))