netdev - [PATCH net 1/2] net/mlx5e: XDP, Allow growing tail for XDP multi buffer

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Message-Id: <20230126191050.220610-2-maxtram95@gmail.com>
Date:   Thu, 26 Jan 2023 21:10:49 +0200
From:   Maxim Mikityanskiy <maxtram95@...il.com>
To:     netdev@...r.kernel.org, Saeed Mahameed <saeedm@...dia.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Gal Pressman <gal@...dia.com>,
        Tariq Toukan <tariqt@...dia.com>,
        Maxim Mikityanskiy <maxtram95@...il.com>
Subject: [PATCH net 1/2] net/mlx5e: XDP, Allow growing tail for XDP multi buffer

The cited commits missed passing frag_size to __xdp_rxq_info_reg, which
is required by bpf_xdp_adjust_tail to support growing the tail pointer
in fragmented packets. Pass the missing parameter when the current RQ
mode allows XDP multi buffer.

Fixes: ea5d49bdae8b ("net/mlx5e: Add XDP multi buffer support to the non-linear legacy RQ")
Fixes: 9cb9482ef10e ("net/mlx5e: Use fragments of the same size in non-linear legacy RQ with XDP")
Signed-off-by: Maxim Mikityanskiy <maxtram95@...il.com>
Cc: Tariq Toukan <tariqt@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index abcc614b6191..cdd1e47e18f9 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -576,9 +576,10 @@ static void mlx5e_free_mpwqe_rq_drop_page(struct mlx5e_rq *rq)
 }
 
 static int mlx5e_init_rxq_rq(struct mlx5e_channel *c, struct mlx5e_params *params,
-			     struct mlx5e_rq *rq)
+			     struct mlx5e_rq_param *rq_params, struct mlx5e_rq *rq)
 {
 	struct mlx5_core_dev *mdev = c->mdev;
+	u32 xdp_frag_size = 0;
 	int err;
 
 	rq->wq_type      = params->rq_wq_type;
@@ -599,7 +600,11 @@ static int mlx5e_init_rxq_rq(struct mlx5e_channel *c, struct mlx5e_params *param
 	if (err)
 		return err;
 
-	return xdp_rxq_info_reg(&rq->xdp_rxq, rq->netdev, rq->ix, c->napi.napi_id);
+	if (rq->wq_type == MLX5_WQ_TYPE_CYCLIC && rq_params->frags_info.num_frags > 1)
+		xdp_frag_size = rq_params->frags_info.arr[1].frag_stride;
+
+	return __xdp_rxq_info_reg(&rq->xdp_rxq, rq->netdev, rq->ix, c->napi.napi_id,
+				  xdp_frag_size);
 }
 
 static int mlx5_rq_shampo_alloc(struct mlx5_core_dev *mdev,
@@ -2214,7 +2219,7 @@ static int mlx5e_open_rxq_rq(struct mlx5e_channel *c, struct mlx5e_params *param
 {
 	int err;
 
-	err = mlx5e_init_rxq_rq(c, params, &c->rq);
+	err = mlx5e_init_rxq_rq(c, params, rq_params, &c->rq);
 	if (err)
 		return err;
 
-- 
2.39.1