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net/mlx5: fix legacy non-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 12:33:12 +00:00 committed by Thomas Monjalon
parent a0865f6f07
commit 57725162f0
2 changed files with 5 additions and 1 deletions
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2
drivers/net/mlx5/mlx5_prm.h
View File

@ -99,6 +99,8 @@
* in tx burst routine at the moment of freeing multiple mbufs.
*/
#define MLX5_EMPW_MAX_PACKETS MLX5_TX_COMP_THRESH
#define MLX5_MPW_MAX_PACKETS 6
/*
* Default packet length threshold to be inlined with
* ordinary SEND. Inlining saves the MR key search

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

@ -3888,7 +3888,9 @@ mlx5_tx_burst_empw_simple(struct mlx5_txq_data *restrict txq,
next_empw:
assert(NB_SEGS(loc->mbuf) == 1);
part = RTE_MIN(pkts_n, MLX5_EMPW_MAX_PACKETS);
part = RTE_MIN(pkts_n, MLX5_TXOFF_CONFIG(MPW) ?
MLX5_MPW_MAX_PACKETS :
MLX5_EMPW_MAX_PACKETS);
if (unlikely(loc->elts_free < part)) {
/* We have no enough elts to save all mbufs. */
if (unlikely(loc->elts_free < MLX5_EMPW_MIN_PACKETS))