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net/mlx5e: NAPI busy-poll when UMR post is in progress 

If a UMR post is in progress, it means that there's a missing
WQE in RQ, and that a completion will be shortly available in
ICO SQ completion queue. Prefer busy-poll to handle it as soon
as possible.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Tariq Toukan 2017-06-19 18:36:30 +03:00 committed by Saeed Mahameed
parent 4c2af5cc2b
commit 4cbb755801
1 changed files with 4 additions and 5 deletions
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9
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
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@ -456,17 +456,16 @@ void mlx5e_dealloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
mlx5e_free_rx_mpwqe(rq, wi);
}
#define RQ_CANNOT_POST(rq) \
(!test_bit(MLX5E_RQ_STATE_ENABLED, &rq->state) || \
test_bit(MLX5E_RQ_STATE_UMR_WQE_IN_PROGRESS, &rq->state))
bool mlx5e_post_rx_wqes(struct mlx5e_rq *rq)
{
struct mlx5_wq_ll *wq = &rq->wq;
if (unlikely(RQ_CANNOT_POST(rq)))
if (unlikely(!test_bit(MLX5E_RQ_STATE_ENABLED, &rq->state)))
return false;
if (test_bit(MLX5E_RQ_STATE_UMR_WQE_IN_PROGRESS, &rq->state))
return true;
while (!mlx5_wq_ll_is_full(wq)) {
struct mlx5e_rx_wqe *wqe = mlx5_wq_ll_get_wqe(wq, wq->head);
int err;