netdev - [PATCH net-next 07/15] net/mlx5e: XDP, Improve Striding RQ check with XDP

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Message-ID: <20230417121903.46218-8-tariqt@nvidia.com>
Date:   Mon, 17 Apr 2023 15:18:55 +0300
From:   Tariq Toukan <tariqt@...dia.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Toke Hoiland-Jorgensen <toke@...hat.com>,
        <netdev@...r.kernel.org>, Saeed Mahameed <saeedm@...dia.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Gal Pressman <gal@...dia.com>,
        Henning Fehrmann <henning.fehrmann@....mpg.de>,
        "Oliver Behnke" <oliver.behnke@....mpg.de>,
        Tariq Toukan <tariqt@...dia.com>
Subject: [PATCH net-next 07/15] net/mlx5e: XDP, Improve Striding RQ check with XDP

Non-linear mem scheme of Striding RQ does not yet support XDP at this
point. Take the check where it belongs, inside the params validation
function mlx5e_params_validate_xdp().

Reviewed-by: Gal Pressman <gal@...dia.com>
Reviewed-by: Saeed Mahameed <saeedm@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
 .../net/ethernet/mellanox/mlx5/core/en_main.c | 23 ++++++++-----------
 1 file changed, 9 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index ccf7bb136f50..faae443770bb 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -4261,8 +4261,16 @@ static bool mlx5e_params_validate_xdp(struct net_device *netdev,
 	/* No XSK params: AF_XDP can't be enabled yet at the point of setting
 	 * the XDP program.
 	 */
-	is_linear = mlx5e_rx_is_linear_skb(mdev, params, NULL);
+	is_linear = params->rq_wq_type == MLX5_WQ_TYPE_CYCLIC ?
+		mlx5e_rx_is_linear_skb(mdev, params, NULL) :
+		mlx5e_rx_mpwqe_is_linear_skb(mdev, params, NULL);
 
+	/* XDP affects striding RQ parameters. Block XDP if striding RQ won't be
+	 * supported with the new parameters: if PAGE_SIZE is bigger than
+	 * MLX5_MPWQE_LOG_STRIDE_SZ_MAX, striding RQ can't be used, even though
+	 * the MTU is small enough for the linear mode, because XDP uses strides
+	 * of PAGE_SIZE on regular RQs.
+	 */
 	if (!is_linear && params->rq_wq_type != MLX5_WQ_TYPE_CYCLIC) {
 		netdev_warn(netdev, "XDP is not allowed with striding RQ and MTU(%d) > %d\n",
 			    params->sw_mtu,
@@ -4817,19 +4825,6 @@ static int mlx5e_xdp_set(struct net_device *netdev, struct bpf_prog *prog)
 	new_params = priv->channels.params;
 	new_params.xdp_prog = prog;
 
-	/* XDP affects striding RQ parameters. Block XDP if striding RQ won't be
-	 * supported with the new parameters: if PAGE_SIZE is bigger than
-	 * MLX5_MPWQE_LOG_STRIDE_SZ_MAX, striding RQ can't be used, even though
-	 * the MTU is small enough for the linear mode, because XDP uses strides
-	 * of PAGE_SIZE on regular RQs.
-	 */
-	if (reset && MLX5E_GET_PFLAG(&new_params, MLX5E_PFLAG_RX_STRIDING_RQ)) {
-		/* Checking for regular RQs here; XSK RQs were checked on XSK bind. */
-		err = mlx5e_mpwrq_validate_regular(priv->mdev, &new_params);
-		if (err)
-			goto unlock;
-	}
-
 	old_prog = priv->channels.params.xdp_prog;
 
 	err = mlx5e_safe_switch_params(priv, &new_params, NULL, NULL, reset);
-- 
2.34.1