net/mlx5: pagealloc: Fix reclaim race during command interface teardown

The reclaim_pages_cmd() function sends a command to the firmware to
reclaim pages if the command interface is active.

A race condition can occur if the command interface goes down (e.g., due
to a PCI error) while the mlx5_cmd_do() call is in flight. In this
case, mlx5_cmd_do() will return an error. The original code would
propagate this error immediately, bypassing the software-based page
reclamation logic that is supposed to run when the command interface is
down.

Fix this by checking whether mlx5_cmd_do() returns -ENXIO, which mark
that command interface is down. If this is the case, fall through to
the software reclamation path. If the command failed for any another
reason, or finished successfully, return as before.

Fixes: b898ce7 ("net/mlx5: cmdif, Avoid skipping reclaim pages if FW is not accessible")
Signed-off-by: Shay Drory <[email protected]>
Reviewed-by: Moshe Shemesh <[email protected]>
Signed-off-by: Tariq Toukan <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>

Author: shayshyi

drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c

@@ -489,9 +489,12 @@ static int reclaim_pages_cmd(struct mlx5_core_dev *dev,
 	u32 func_id;
 	u32 npages;
 	u32 i = 0;
+	int err;
 
-	if (!mlx5_cmd_is_down(dev))
-		return mlx5_cmd_do(dev, in, in_size, out, out_size);
+	err = mlx5_cmd_do(dev, in, in_size, out, out_size);
+	/* If FW is gone (-ENXIO), proceed to forceful reclaim */
+	if (err != -ENXIO)
+		return err;
 
 	/* No hard feelings, we want our pages back! */
 	npages = MLX5_GET(manage_pages_in, in, input_num_entries);