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| author |   Liu, Changcheng <jerrliu@nvidia.com> | 2022-09-07 16:36:26 -0700 |
|---|---|---|
| committer |   Saeed Mahameed <saeedm@nvidia.com> | 2022-09-27 12:50:27 -0700 |
| commit | a83bb5df2ac604ab418fbe0a8720f55de46652eb (patch) | |
| tree | 33308b93f47884b42dc1961cd1a08e2a6795ee82 /drivers/infiniband | |
| parent | net/mlx5: add IFC bits for bypassing port select flow table (diff) | |
| download | linux-dev-a83bb5df2ac604ab418fbe0a8720f55de46652eb.tar.xz linux-dev-a83bb5df2ac604ab418fbe0a8720f55de46652eb.zip | |
RDMA/mlx5: Don't set tx affinity when lag is in hash mode
In hash mode, without setting tx affinity explicitly, the port select
flow table decides which port is used for the traffic.
If port_select_flow_table_bypass capability is supported and tx affinity
is set explicitly for QP/TIS, they will be added into the explicit affinity
table in FW to check which port is used for the traffic.
1. The overloaded explicit affinity table may affect performance.
To avoid this, do not set tx affinity explicitly by default.
2. The packets of the same flow need to be transmitted on the same port.
Because the packets of the same flow use different QPs in slow & fast
path, it shouldn't set tx affinity explicitly for these QPs.
Signed-off-by: Liu, Changcheng <jerrliu@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Reviewed-by: Vlad Buslov <vladbu@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Diffstat (limited to 'drivers/infiniband')
| -rw-r--r-- | drivers/infiniband/hw/mlx5/mlx5_ib.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h index 2e2ad3918385..c3e014283c41 100644 --- a/drivers/infiniband/hw/mlx5/mlx5_ib.h +++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h @@ -1540,6 +1540,18 @@ int mlx5_ib_test_wc(struct mlx5_ib_dev *dev); static inline bool mlx5_ib_lag_should_assign_affinity(struct mlx5_ib_dev *dev) { + /* + * If the driver is in hash mode and the port_select_flow_table_bypass cap + * is supported, it means that the driver no longer needs to assign the port + * affinity by default. If a user wants to set the port affinity explicitly, + * the user has a dedicated API to do that, so there is no need to assign + * the port affinity by default. + */ + if (dev->lag_active && + mlx5_lag_mode_is_hash(dev->mdev) && + MLX5_CAP_PORT_SELECTION(dev->mdev, port_select_flow_table_bypass)) + return 0; + return dev->lag_active || (MLX5_CAP_GEN(dev->mdev, num_lag_ports) > 1 && MLX5_CAP_GEN(dev->mdev, lag_tx_port_affinity)); |