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| author |   Tariq Toukan <tariqt@nvidia.com> | 2022-01-19 18:35:42 +0200 |
|---|---|---|
| committer |   Saeed Mahameed <saeedm@nvidia.com> | 2022-02-16 23:55:14 -0800 |
| commit | 4b5fba4a3ac790ad79bb4d36e7a4398702429b4d (patch) | |
| tree | a397802ed3fbd80ce43a5b6f03479baf5a6b5ae6 /drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | |
| parent | net/mlx5e: Default to Striding RQ when not conflicting with CQE compression (diff) | |
| download | wireguard-linux-4b5fba4a3ac790ad79bb4d36e7a4398702429b4d.tar.xz wireguard-linux-4b5fba4a3ac790ad79bb4d36e7a4398702429b4d.zip | |
net/mlx5e: RX, Restrict bulk size for small Striding RQs
In RQs of type multi-packet WQE (Striding RQ), each WQE is relatively
large (typically 256KB) but their number is relatively small (8 in
default).
Re-mapping the descriptors' buffers before re-posting them is done via
UMR (User-Mode Memory Registration) operations.
On the one hand, posting UMR WQEs in bulks reduces communication overhead
with the HW and better utilizes its processing units.
On the other hand, delaying the WQE repost operations for a small RQ
(say, of 4 WQEs) might drastically hit its performance, causing packet
drops due to no receive buffer, for high or bursty incoming packets rate.
Here we restrict the bulk size for too small RQs. Effectively, with the current
constants, RQ of size 4 (minimum allowed) would have no bulking, while larger
RQs will continue working with bulks of 2.
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx5/core/en_rx.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c index 3fe4f06f3e71..4cb7c7135b6a 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c @@ -960,8 +960,7 @@ INDIRECT_CALLABLE_SCOPE bool mlx5e_post_rx_mpwqes(struct mlx5e_rq *rq) if (unlikely(rq->mpwqe.umr_in_progress > rq->mpwqe.umr_last_bulk)) rq->stats->congst_umr++; -#define UMR_WQE_BULK (2) - if (likely(missing < UMR_WQE_BULK)) + if (likely(missing < rq->mpwqe.min_wqe_bulk)) return false; if (rq->page_pool) |