From: Maxim Mikityanskiy Date: Wed, 26 Jun 2019 14:35:30 +0000 (+0300) Subject: net/mlx5e: Calculate linear RX frag size considering XSK X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=a069e977d6d8f26c90a5d9374135729dc41c3a0d;p=openwrt%2Fstaging%2Fblogic.git net/mlx5e: Calculate linear RX frag size considering XSK Additional conditions introduced: - XSK implies XDP. - Headroom includes the XSK headroom if it exists. - No space is reserved for struct shared_skb_info in XSK mode. - Fragment size smaller than the XSK chunk size is not allowed. A new auxiliary function mlx5e_get_linear_rq_headroom with the support for XSK is introduced. Use this function in the implementation of mlx5e_get_rq_headroom. Change headroom to u32 to match the headroom field in struct xdp_umem. Signed-off-by: Maxim Mikityanskiy Signed-off-by: Tariq Toukan Acked-by: Saeed Mahameed Signed-off-by: Daniel Borkmann --- diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c index d3744bffbae3..50a458dc3836 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c @@ -3,33 +3,62 @@ #include "en/params.h" -u32 mlx5e_rx_get_linear_frag_sz(struct mlx5e_params *params) +static inline bool mlx5e_rx_is_xdp(struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk) { - u16 hw_mtu = MLX5E_SW2HW_MTU(params, params->sw_mtu); - u16 linear_rq_headroom = params->xdp_prog ? - XDP_PACKET_HEADROOM : MLX5_RX_HEADROOM; - u32 frag_sz; + return params->xdp_prog || xsk; +} + +static inline u16 mlx5e_get_linear_rq_headroom(struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk) +{ + u16 headroom = NET_IP_ALIGN; + + if (mlx5e_rx_is_xdp(params, xsk)) { + headroom += XDP_PACKET_HEADROOM; + if (xsk) + headroom += xsk->headroom; + } else { + headroom += MLX5_RX_HEADROOM; + } + + return headroom; +} + +u32 mlx5e_rx_get_linear_frag_sz(struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk) +{ + u32 hw_mtu = MLX5E_SW2HW_MTU(params, params->sw_mtu); + u16 linear_rq_headroom = mlx5e_get_linear_rq_headroom(params, xsk); + u32 frag_sz = linear_rq_headroom + hw_mtu; - linear_rq_headroom += NET_IP_ALIGN; + /* AF_XDP doesn't build SKBs in place. */ + if (!xsk) + frag_sz = MLX5_SKB_FRAG_SZ(frag_sz); - frag_sz = MLX5_SKB_FRAG_SZ(linear_rq_headroom + hw_mtu); + /* XDP in mlx5e doesn't support multiple packets per page. */ + if (mlx5e_rx_is_xdp(params, xsk)) + frag_sz = max_t(u32, frag_sz, PAGE_SIZE); - if (params->xdp_prog && frag_sz < PAGE_SIZE) - frag_sz = PAGE_SIZE; + /* Even if we can go with a smaller fragment size, we must not put + * multiple packets into a single frame. + */ + if (xsk) + frag_sz = max_t(u32, frag_sz, xsk->chunk_size); return frag_sz; } u8 mlx5e_mpwqe_log_pkts_per_wqe(struct mlx5e_params *params) { - u32 linear_frag_sz = mlx5e_rx_get_linear_frag_sz(params); + u32 linear_frag_sz = mlx5e_rx_get_linear_frag_sz(params, NULL); return MLX5_MPWRQ_LOG_WQE_SZ - order_base_2(linear_frag_sz); } bool mlx5e_rx_is_linear_skb(struct mlx5e_params *params) { - u32 frag_sz = mlx5e_rx_get_linear_frag_sz(params); + u32 frag_sz = mlx5e_rx_get_linear_frag_sz(params, NULL); return !params->lro_en && frag_sz <= PAGE_SIZE; } @@ -39,7 +68,7 @@ bool mlx5e_rx_is_linear_skb(struct mlx5e_params *params) bool mlx5e_rx_mpwqe_is_linear_skb(struct mlx5_core_dev *mdev, struct mlx5e_params *params) { - u32 frag_sz = mlx5e_rx_get_linear_frag_sz(params); + u32 frag_sz = mlx5e_rx_get_linear_frag_sz(params, NULL); s8 signed_log_num_strides_param; u8 log_num_strides; @@ -75,7 +104,7 @@ u8 mlx5e_mpwqe_get_log_stride_size(struct mlx5_core_dev *mdev, struct mlx5e_params *params) { if (mlx5e_rx_mpwqe_is_linear_skb(mdev, params)) - return order_base_2(mlx5e_rx_get_linear_frag_sz(params)); + return order_base_2(mlx5e_rx_get_linear_frag_sz(params, NULL)); return MLX5_MPWRQ_DEF_LOG_STRIDE_SZ(mdev); } @@ -90,15 +119,9 @@ u8 mlx5e_mpwqe_get_log_num_strides(struct mlx5_core_dev *mdev, u16 mlx5e_get_rq_headroom(struct mlx5_core_dev *mdev, struct mlx5e_params *params) { - u16 linear_rq_headroom = params->xdp_prog ? - XDP_PACKET_HEADROOM : MLX5_RX_HEADROOM; - bool is_linear_skb; - - linear_rq_headroom += NET_IP_ALIGN; - - is_linear_skb = (params->rq_wq_type == MLX5_WQ_TYPE_CYCLIC) ? + bool is_linear_skb = (params->rq_wq_type == MLX5_WQ_TYPE_CYCLIC) ? mlx5e_rx_is_linear_skb(params) : mlx5e_rx_mpwqe_is_linear_skb(mdev, params); - return is_linear_skb ? linear_rq_headroom : 0; + return is_linear_skb ? mlx5e_get_linear_rq_headroom(params, NULL) : 0; } diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/params.h b/drivers/net/ethernet/mellanox/mlx5/core/en/params.h index b106a0236f36..ed420f3efe52 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en/params.h +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/params.h @@ -6,7 +6,13 @@ #include "en.h" -u32 mlx5e_rx_get_linear_frag_sz(struct mlx5e_params *params); +struct mlx5e_xsk_param { + u16 headroom; + u16 chunk_size; +}; + +u32 mlx5e_rx_get_linear_frag_sz(struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk); u8 mlx5e_mpwqe_log_pkts_per_wqe(struct mlx5e_params *params); bool mlx5e_rx_is_linear_skb(struct mlx5e_params *params); bool mlx5e_rx_mpwqe_is_linear_skb(struct mlx5_core_dev *mdev, diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c index 1b427d7fab42..837a973b3507 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c @@ -1954,7 +1954,7 @@ static void mlx5e_build_rq_frags_info(struct mlx5_core_dev *mdev, if (mlx5e_rx_is_linear_skb(params)) { int frag_stride; - frag_stride = mlx5e_rx_get_linear_frag_sz(params); + frag_stride = mlx5e_rx_get_linear_frag_sz(params, NULL); frag_stride = roundup_pow_of_two(frag_stride); info->arr[0].frag_size = byte_count;