net/mlx5e: Optimize XDP frame xmit

Browse source

XDP SQ has a fixed size WQE (MLX5E_XDP_TX_WQEBBS = 1) and only posts
one kind of WQE (MLX5_OPCODE_SEND),

Also we initialize SQ descriptors static fields once on open_xdpsq,
rather than every time on critical path.

Optimize the code in light of those facts and add a prefetch of the TX
descriptor first thing in the xdp xmit function.

Performance improvement:
System: Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz

Test case              Before     Now        improvement
---------------------------------------------------------------
XDP TX   (1 core)      13Mpps    13.7Mpps       5%

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Saeed Mahameed 2017-03-25 00:52:10 +03:00 • committed by David S. Miller

parent 39e12351a3

commit 2239185ccd

3 changed files with 47 additions and 42 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

5

drivers/net/ethernet/mellanox/mlx5/core/en.h

View file

43

drivers/net/ethernet/mellanox/mlx5/core/en_main.c

View file

41

drivers/net/ethernet/mellanox/mlx5/core/en_rx.c

View file