[PATCH 6.19 467/781] IB/mlx5: Fix port speed query for representors

Greg Kroah-Hartman
2026-02-25T01:35:38Z

From: Or Har-Toov <ohartoov@nvidia.com>

[ Upstream commit 18ea78e2ae83d1d86a72d21d9511927e57e2c0e1 ]

When querying speed information for a representor in switchdev mode,
the code previously used the first device in the eswitch, which may not
match the device that actually owns the representor. In setups such as
multi-port eswitch or LAG, this led to incorrect port attributes being
reported.

Fix this by retrieving the correct core device from the representor's
eswitch before querying its port attributes.

Fixes: 27f9e0ccb6da ("net/mlx5: Lag, Add single RDMA device in multiport mode")
Signed-off-by: Or Har-Toov <ohartoov@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Edward Srouji <edwards@nvidia.com>
Link: https://patch.msgid.link/20260115-port-speed-query-fix-v2-1-3bde6a3c78e7@nvidia.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/infiniband/hw/mlx5/main.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index 3485a9a3d75e0..9997479410005 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -561,12 +561,20 @@ static int mlx5_query_port_roce(struct ib_device *device, u32 port_num,
* of an error it will still be zeroed out.
* Use native port in case of reps
*/
- if (dev->is_rep)
- err = mlx5_query_port_ptys(mdev, out, sizeof(out), MLX5_PTYS_EN,
- 1, 0);
- else
- err = mlx5_query_port_ptys(mdev, out, sizeof(out), MLX5_PTYS_EN,
- mdev_port_num, 0);
+ if (dev->is_rep) {
+ struct mlx5_eswitch_rep *rep;
+
+ rep = dev->port[port_num - 1].rep;
+ if (rep) {
+ mdev = mlx5_eswitch_get_core_dev(rep->esw);
+ WARN_ON(!mdev);
+ }
+ mdev_port_num = 1;
+ }
+
+ err = mlx5_query_port_ptys(mdev, out, sizeof(out), MLX5_PTYS_EN,
+ mdev_port_num, 0);
+
if (err)
goto out;
ext = !!MLX5_GET_ETH_PROTO(ptys_reg, out, true, eth_proto_capability);
--
2.51.0