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net/mlx5e: RX, Recycle buffer of UMR WQEs 

Upon a new UMR post, check if the WQE buffer contains
a previous UMR WQE. If so, modify the dynamic fields
instead of a whole WQE overwrite. This saves a memcpy.

In current setting, after 2 WQ cycles (12 UMR posts),
this will always be the case.

No degradation sensed.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Tariq Toukan 2018-01-04 13:09:15 +02:00 committed by Saeed Mahameed
parent b8a98a4cf3
commit ab966d7e4f
1 changed files with 9 additions and 2 deletions
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11
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
View File

@ -365,6 +365,11 @@ static void mlx5e_post_rx_mpwqe(struct mlx5e_rq *rq)
mlx5_wq_ll_update_db_record(wq);
}
static inline u16 mlx5e_icosq_wrap_cnt(struct mlx5e_icosq *sq)
{
return sq->pc >> MLX5E_PARAMS_MINIMUM_LOG_SQ_SIZE;
}
static int mlx5e_alloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
{
struct mlx5e_mpw_info *wi = &rq->mpwqe.info[ix];
@ -372,7 +377,6 @@ static int mlx5e_alloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
struct mlx5e_icosq *sq = &rq->channel->icosq;
struct mlx5_wq_cyc *wq = &sq->wq;
struct mlx5e_umr_wqe *umr_wqe;
int cpy = offsetof(struct mlx5e_umr_wqe, inline_mtts);
u16 xlt_offset = ix << (MLX5E_LOG_ALIGNED_MPWQE_PPW - 1);
int err;
u16 pi;
@ -385,7 +389,10 @@ static int mlx5e_alloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
}
umr_wqe = mlx5_wq_cyc_get_wqe(wq, pi);
memcpy(umr_wqe, &rq->mpwqe.umr_wqe, cpy);
if (unlikely(mlx5e_icosq_wrap_cnt(sq) < 2))
memcpy(umr_wqe, &rq->mpwqe.umr_wqe,
offsetof(struct mlx5e_umr_wqe, inline_mtts));
for (i = 0; i < MLX5_MPWRQ_PAGES_PER_WQE; i++, dma_info++) {
err = mlx5e_page_alloc_mapped(rq, dma_info);
if (unlikely(err))