net/mlx4_en: Optimized single ring steering
authorSaeed Mahameed <saeedm@mellanox.com>
Thu, 15 Jun 2017 11:35:32 +0000 (14:35 +0300)
committerDavid S. Miller <davem@davemloft.net>
Fri, 16 Jun 2017 02:53:22 +0000 (22:53 -0400)
commit4931c6ef04b4eb6f726def76f845c10d1bb7057d
tree98cbf8b933e86828cceabfad8f3f5479e0cefd29
parentcf97050d547281edc5b813b501d5888c60f23bb2
net/mlx4_en: Optimized single ring steering

Avoid touching RX QP RSS context when loading with only
one RX ring, to allow optimized A0 RX steering.

Enable by:
- loading mlx4_core with module param: log_num_mgm_entry_size = -6.
- then: ethtool -L <interface> rx 1

Performance tests:
Tested on ConnectX3Pro, Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz

XDP_DROP packet rate:
-------------------------------------
     | Before    | After     | Gain |
IPv4 | 20.5 Mpps | 28.1 Mpps |  37% |
IPv6 | 18.4 Mpps | 28.1 Mpps |  53% |
-------------------------------------

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Cc: kernel-team@fb.com
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/mellanox/mlx4/en_main.c
drivers/net/ethernet/mellanox/mlx4/en_netdev.c
drivers/net/ethernet/mellanox/mlx4/en_rx.c
drivers/net/ethernet/mellanox/mlx4/main.c
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h