From mboxrd@z Thu Jan 1 00:00:00 1970 From: Saeed Mahameed Subject: [net-next 15/15] net/mlx5e: RX, Recycle buffer of UMR WQEs Date: Fri, 30 Mar 2018 17:02:52 -0700 Message-ID: <20180331000252.30480-16-saeedm@mellanox.com> References: <20180331000252.30480-1-saeedm@mellanox.com> Cc: netdev@vger.kernel.org, Tariq Toukan , Jesper Dangaard Brouer , Saeed Mahameed To: "David S. Miller" Return-path: Received: from mail-il-dmz.mellanox.com ([193.47.165.129]:33595 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752846AbeCaA1b (ORCPT ); Fri, 30 Mar 2018 20:27:31 -0400 In-Reply-To: <20180331000252.30480-1-saeedm@mellanox.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Tariq Toukan 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 Signed-off-by: Saeed Mahameed --- drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 11 +++++++++-- 1 file changed, 9 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 682f9ff9da34..176645762e49 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c @@ -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)) -- 2.14.3