From 22f4539881944a8acc9c6f5afa7aa7f028898002 Mon Sep 17 00:00:00 2001 From: Tariq Toukan Date: Wed, 7 Feb 2018 14:46:36 +0200 Subject: [PATCH] net/mlx5e: Support XDP over Striding RQ Add XDP support over Striding RQ. Now that linear SKB is supported over Striding RQ, we can support XDP by setting stride size to PAGE_SIZE and headroom to XDP_PACKET_HEADROOM. Upon a MPWQE free, do not release pages that are being XDP xmit, they will be released upon completions. Striding RQ is capable of a higher packet-rate than conventional RQ. A performance gain is expected for all cases that had a HW packet-rate bottleneck. This is the case whenever using many flows that distribute to many cores. Performance testing: ConnectX-5, 24 rings, default MTU. CQE compression ON (to reduce completions BW in PCI). XDP_DROP packet rate: -------------------------------------------------- | pkt size | XDP rate | 100GbE linerate | pct% | -------------------------------------------------- | 64byte | 126.2 Mpps | 148.0 Mpps | 85% | | 128byte | 80.0 Mpps | 84.8 Mpps | 94% | | 256byte | 42.7 Mpps | 42.7 Mpps | 100% | | 512byte | 23.4 Mpps | 23.4 Mpps | 100% | -------------------------------------------------- Signed-off-by: Tariq Toukan Signed-off-by: Saeed Mahameed --- drivers/net/ethernet/mellanox/mlx5/core/en.h | 1 + drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 3 ++- drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 30 +++++++++++++++++------ 3 files changed, 26 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h index a6ca543..7997d7c 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en.h +++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h @@ -457,6 +457,7 @@ struct mlx5e_mpw_info { struct mlx5e_umr_dma_info umr; u16 consumed_strides; u16 skbs_frags[MLX5_MPWRQ_PAGES_PER_WQE]; + DECLARE_BITMAP(xdp_xmit_bitmap, MLX5_MPWRQ_PAGES_PER_WQE); }; /* a single cache unit is capable to serve one napi call (for non-striding rq) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c index bba2fa0..b03a232 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c @@ -200,7 +200,8 @@ bool mlx5e_striding_rq_possible(struct mlx5_core_dev *mdev, struct mlx5e_params *params) { return mlx5e_check_fragmented_striding_rq_cap(mdev) && - !params->xdp_prog && !MLX5_IPSEC_DEV(mdev); + !MLX5_IPSEC_DEV(mdev) && + !(params->xdp_prog && !mlx5e_rx_mpwqe_is_linear_skb(mdev, params)); } void mlx5e_set_rq_type(struct mlx5_core_dev *mdev, struct mlx5e_params *params) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c index a827571..1da79ca 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c @@ -349,13 +349,16 @@ mlx5e_copy_skb_header_mpwqe(struct device *pdev, void mlx5e_free_rx_mpwqe(struct mlx5e_rq *rq, struct mlx5e_mpw_info *wi) { + const bool no_xdp_xmit = + bitmap_empty(wi->xdp_xmit_bitmap, MLX5_MPWRQ_PAGES_PER_WQE); int pg_strides = mlx5e_mpwqe_strides_per_page(rq); - struct mlx5e_dma_info *dma_info = &wi->umr.dma_info[0]; + struct mlx5e_dma_info *dma_info = wi->umr.dma_info; int i; - for (i = 0; i < MLX5_MPWRQ_PAGES_PER_WQE; i++, dma_info++) { - page_ref_sub(dma_info->page, pg_strides - wi->skbs_frags[i]); - mlx5e_page_release(rq, dma_info, true); + for (i = 0; i < MLX5_MPWRQ_PAGES_PER_WQE; i++) { + page_ref_sub(dma_info[i].page, pg_strides - wi->skbs_frags[i]); + if (no_xdp_xmit || !test_bit(i, wi->xdp_xmit_bitmap)) + mlx5e_page_release(rq, &dma_info[i], true); } } @@ -404,6 +407,7 @@ static int mlx5e_alloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix) } memset(wi->skbs_frags, 0, sizeof(*wi->skbs_frags) * MLX5_MPWRQ_PAGES_PER_WQE); + bitmap_zero(wi->xdp_xmit_bitmap, MLX5_MPWRQ_PAGES_PER_WQE); wi->consumed_strides = 0; rq->mpwqe.umr_in_progress = true; @@ -1028,18 +1032,30 @@ mlx5e_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq, struct mlx5e_mpw_info *wi, { struct mlx5e_dma_info *di = &wi->umr.dma_info[page_idx]; u16 rx_headroom = rq->buff.headroom; + u32 cqe_bcnt32 = cqe_bcnt; struct sk_buff *skb; void *va, *data; u32 frag_size; + bool consumed; va = page_address(di->page) + head_offset; data = va + rx_headroom; - frag_size = MLX5_SKB_FRAG_SZ(rx_headroom + cqe_bcnt); + frag_size = MLX5_SKB_FRAG_SZ(rx_headroom + cqe_bcnt32); dma_sync_single_range_for_cpu(rq->pdev, di->addr, head_offset, frag_size, DMA_FROM_DEVICE); prefetch(data); - skb = mlx5e_build_linear_skb(rq, va, frag_size, rx_headroom, cqe_bcnt); + + rcu_read_lock(); + consumed = mlx5e_xdp_handle(rq, di, va, &rx_headroom, &cqe_bcnt32); + rcu_read_unlock(); + if (consumed) { + if (__test_and_clear_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags)) + __set_bit(page_idx, wi->xdp_xmit_bitmap); /* non-atomic */ + return NULL; /* page/packet was consumed by XDP */ + } + + skb = mlx5e_build_linear_skb(rq, va, frag_size, rx_headroom, cqe_bcnt32); if (unlikely(!skb)) return NULL; @@ -1078,7 +1094,7 @@ void mlx5e_handle_rx_cqe_mpwrq(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe) skb = rq->mpwqe.skb_from_cqe_mpwrq(rq, wi, cqe_bcnt, head_offset, page_idx); - if (unlikely(!skb)) + if (!skb) goto mpwrq_cqe_out; mlx5e_complete_rx_cqe(rq, cqe, cqe_bcnt, skb); -- 2.7.4