netdev - [PATCH net] net/mlx5: Not returning mlx5_link

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Message-ID: <20250908085313.18768-1-litian@redhat.com>
Date: Mon,  8 Sep 2025 16:53:13 +0800
From: Li Tian <litian@...hat.com>
To: netdev@...r.kernel.org,
	linux-hyperv@...r.kernel.org
Cc: Saeed Mahameed <saeedm@...dia.com>,
	Tariq Toukan <tariqt@...dia.com>,
	Mark Bloch <mbloch@...dia.com>,
	Leon Romanovsky <leon@...nel.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Benjamin Poirier <bpoirier@...hat.com>,
	Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: [PATCH net] net/mlx5: Not returning mlx5_link_info table when speed is unknown

Because mlx5e_link_mode is sparse e.g. Azure mlx5 reports PTYS 19.
Do not return it when speed unless retrieved successfully.

Fixes: 65a5d35571849 ("net/mlx5: Refactor link speed handling with mlx5_link_info struct")
Suggested-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Signed-off-by: Li Tian <litian@...hat.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/port.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/port.c b/drivers/net/ethernet/mellanox/mlx5/core/port.c
index 2d7adf7444ba..a69c83da2542 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/port.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/port.c
@@ -1170,7 +1170,11 @@ const struct mlx5_link_info *mlx5_port_ptys2info(struct mlx5_core_dev *mdev,
 	mlx5e_port_get_link_mode_info_arr(mdev, &table, &max_size,
 					  force_legacy);
 	i = find_first_bit(&temp, max_size);
-	if (i < max_size)
+	/*
+	 * mlx5e_link_mode is sparse. Check speed
+	 * is non-zero as indication of a hole.
+	 */
+	if (i < max_size && table[i].speed)
 		return &table[i];
 
 	return NULL;
-- 
2.50.0