From fb3bfdfcd10609c90911307a545864d2996d951f Mon Sep 17 00:00:00 2001 From: Carolina Jubran Date: Mon, 18 Dec 2023 13:58:27 +0200 Subject: net/mlx5e: XSK, Exclude tailroom from non-linear SKBs memory calculations Packet data buffers lack reserved headroom or tailroom, and SKBs are allocated on a side memory when needed. Exclude the tailroom from the SKB size calculations. Signed-off-by: Carolina Jubran Reviewed-by: Tariq Toukan Signed-off-by: Saeed Mahameed --- drivers/net/ethernet/mellanox/mlx5/core/en/params.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) (limited to 'drivers/net/ethernet') diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c index 5d213a9886f1..b9d39ef8053c 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c @@ -240,11 +240,14 @@ static u32 mlx5e_rx_get_linear_sz_xsk(struct mlx5e_params *params, return xsk->headroom + hw_mtu; } -static u32 mlx5e_rx_get_linear_sz_skb(struct mlx5e_params *params, bool xsk) +static u32 mlx5e_rx_get_linear_sz_skb(struct mlx5e_params *params, bool no_head_tail_room) { - /* SKBs built on XDP_PASS on XSK RQs don't have headroom. */ - u16 headroom = xsk ? 0 : mlx5e_get_linear_rq_headroom(params, NULL); u32 hw_mtu = MLX5E_SW2HW_MTU(params, params->sw_mtu); + u16 headroom; + + if (no_head_tail_room) + return SKB_DATA_ALIGN(hw_mtu); + headroom = mlx5e_get_linear_rq_headroom(params, NULL); return MLX5_SKB_FRAG_SZ(headroom + hw_mtu); } @@ -289,7 +292,11 @@ bool mlx5e_rx_is_linear_skb(struct mlx5_core_dev *mdev, if (params->packet_merge.type != MLX5E_PACKET_MERGE_NONE) return false; - /* Both XSK and non-XSK cases allocate an SKB on XDP_PASS. Packet data + /* Call mlx5e_rx_get_linear_sz_skb with the no_head_tail_room parameter set + * to exclude headroom and tailroom from calculations. + * no_head_tail_room is true when SKB is built on XDP_PASS on XSK RQs + * since packet data buffers don't have headroom and tailroom resreved for the SKB. + * Both XSK and non-XSK cases allocate an SKB on XDP_PASS. Packet data * must fit into a CPU page. */ if (mlx5e_rx_get_linear_sz_skb(params, xsk) > PAGE_SIZE) -- cgit v1.2.3