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RDMA/mlx5: Support TX port affinity for VF drivers in LAG mode

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The mlx5 VF driver doesn't set QP tx port affinity because it doesn't know
if the lag is active or not, since the "lag_active" works only for PF
interfaces. In this case for VF interfaces only one lag is used which
brings performance issue.

Add a lag_tx_port_affinity CAP bit; When it is enabled and
"num_lag_ports > 1", then driver always set QP tx affinity, regardless
of lag state.

Link: https://lore.kernel.org/r/20200527055014.355093-1-leon@kernel.org
Signed-off-by: Mark Zhang <markz@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Mark Zhang 2020-05-27 08:50:14 +03:00 committed by Jason Gunthorpe
parent e0cca8b456
commit 802dcc7fc5
3 changed files with 10 additions and 2 deletions
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2
drivers/infiniband/hw/mlx5/main.c
View file

@ -1972,7 +1972,7 @@ static int mlx5_ib_alloc_ucontext(struct ib_ucontext *uctx,
context->lib_caps = req.lib_caps;
print_lib_caps(dev, context->lib_caps);
if (dev->lag_active) {
if (mlx5_ib_lag_should_assign_affinity(dev)) {
u8 port = mlx5_core_native_port_num(dev->mdev) - 1;
atomic_set(&context->tx_port_affinity,

7
drivers/infiniband/hw/mlx5/mlx5_ib.h
View file

@ -1550,4 +1550,11 @@ static inline bool mlx5_ib_can_use_umr(struct mlx5_ib_dev *dev,
int mlx5_ib_enable_driver(struct ib_device *dev);
int mlx5_ib_test_wc(struct mlx5_ib_dev *dev);
static inline bool mlx5_ib_lag_should_assign_affinity(struct mlx5_ib_dev *dev)
{
return dev->lag_active ||
(MLX5_CAP_GEN(dev->mdev, num_lag_ports) > 1 &&
MLX5_CAP_GEN(dev->mdev, lag_tx_port_affinity));
}
#endif /* MLX5_IB_H */

3
drivers/infiniband/hw/mlx5/qp.c
View file

@ -3653,7 +3653,8 @@ static unsigned int get_tx_affinity(struct ib_qp *qp,
struct mlx5_ib_qp_base *qp_base;
unsigned int tx_affinity;
if (!(dev->lag_active && qp_supports_affinity(qp)))
if (!(mlx5_ib_lag_should_assign_affinity(dev) &&
qp_supports_affinity(qp)))
return 0;
if (mqp->flags & MLX5_IB_QP_CREATE_SQPN_QP1)