linux-kernel - [PATCH net-next 6/6] net/mlx5e: Support XDP target xmit with dummy program

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Message-ID: <1762939749-1165658-7-git-send-email-tariqt@nvidia.com>
Date: Wed, 12 Nov 2025 11:29:09 +0200
From: Tariq Toukan <tariqt@...dia.com>
To: Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David
 S. Miller" <davem@...emloft.net>
CC: Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
	Tariq Toukan <tariqt@...dia.com>, Mark Bloch <mbloch@...dia.com>, "Alexei
 Starovoitov" <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
	"Jesper Dangaard Brouer" <hawk@...nel.org>, John Fastabend
	<john.fastabend@...il.com>, <netdev@...r.kernel.org>,
	<linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<bpf@...r.kernel.org>, Gal Pressman <gal@...dia.com>, Leon Romanovsky
	<leonro@...dia.com>, Moshe Shemesh <moshe@...dia.com>, William Tu
	<witu@...dia.com>, Dragos Tatulea <dtatulea@...dia.com>, Nimrod Oren
	<noren@...dia.com>, Alex Lazar <alazar@...dia.com>
Subject: [PATCH net-next 6/6] net/mlx5e: Support XDP target xmit with dummy program

Save per-channel resources in default.

As no better API exist, make the XDP-redirect-target SQ available by
loading a dummy XDP program.

This improves the latency of interface up/down operations when feature
is disabled.

Perf numbers:
NIC: Connect-X7.
Setup: 248 channels.

Interface up + down:
Before: 2.246 secs
After:  1.798 secs (1.25x faster)

Signed-off-by: Tariq Toukan <tariqt@...dia.com>
Reviewed-by: Dragos Tatulea <dtatulea@...dia.com>
Reviewed-by: William Tu <witu@...dia.com>
---
 .../net/ethernet/mellanox/mlx5/core/en_main.c | 23 +++++++++----------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 078fd591c540..23a0b50b9dbd 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -2652,7 +2652,7 @@ static int mlx5e_open_queues(struct mlx5e_channel *c,
 	if (err)
 		goto err_close_icosq_cq;
 
-	if (netdev_ops->ndo_xdp_xmit) {
+	if (netdev_ops->ndo_xdp_xmit && c->xdp) {
 		c->xdpsq = mlx5e_open_xdpredirect_sq(c, params, cparam, &ccp);
 		if (IS_ERR(c->xdpsq)) {
 			err = PTR_ERR(c->xdpsq);
@@ -4467,19 +4467,18 @@ void mlx5e_set_xdp_feature(struct mlx5e_priv *priv)
 {
 	struct mlx5e_params *params = &priv->channels.params;
 	struct net_device *netdev = priv->netdev;
-	xdp_features_t val;
+	xdp_features_t val = 0;
 
-	if (!netdev->netdev_ops->ndo_bpf ||
-	    params->packet_merge.type != MLX5E_PACKET_MERGE_NONE) {
-		xdp_set_features_flag_locked(netdev, 0);
-		return;
-	}
+	if (netdev->netdev_ops->ndo_bpf &&
+	    params->packet_merge.type == MLX5E_PACKET_MERGE_NONE)
+		val = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
+		      NETDEV_XDP_ACT_XSK_ZEROCOPY |
+		      NETDEV_XDP_ACT_RX_SG;
+
+	if (netdev->netdev_ops->ndo_xdp_xmit && params->xdp_prog)
+		val |= NETDEV_XDP_ACT_NDO_XMIT |
+			NETDEV_XDP_ACT_NDO_XMIT_SG;
 
-	val = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
-	      NETDEV_XDP_ACT_XSK_ZEROCOPY |
-	      NETDEV_XDP_ACT_RX_SG |
-	      NETDEV_XDP_ACT_NDO_XMIT |
-	      NETDEV_XDP_ACT_NDO_XMIT_SG;
 	xdp_set_features_flag_locked(netdev, val);
 }
 
-- 
2.31.1