diff mbox series

[net-next,V3,14/15] net/mlx5e: XSK, Exclude tailroom from non-linear SKBs memory calculations

Message ID 20240202190854.1308089-15-saeed@kernel.org (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series [net-next,V3,01/15] xfrm: generalize xdo_dev_state_update_curlft to allow statistics update | expand

Checks

Context Check Description
netdev/series_format success Pull request is its own cover letter
netdev/tree_selection success Clearly marked for net-next, async
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1048 this patch: 1048
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 0 of 0 maintainers
netdev/build_clang success Errors and warnings before: 1065 this patch: 1065
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1065 this patch: 1065
netdev/checkpatch warning WARNING: line length of 83 exceeds 80 columns WARNING: line length of 90 exceeds 80 columns WARNING: line length of 91 exceeds 80 columns
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest success net-next-2024-02-04--21-00 (tests: 721)

Commit Message

Saeed Mahameed Feb. 2, 2024, 7:08 p.m. UTC 
From: Carolina Jubran <cjubran@nvidia.com>

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 <cjubran@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
---
 .../net/ethernet/mellanox/mlx5/core/en/params.c   | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)
diff mbox series

Patch

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)