net/mlx4_core: Use sink counter for the VF default as fallback

Some old PF drivers don't let VFs allocate counters, in that case, use
the sink counter so the VF can load and operate properly.

Fixes: 6de5f7f6a1fa ('net/mlx4_core: Allocate default counter per port')
Reported-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index 12fbfcb44d8acdedf08fef880a12e53145f8836e..29c2a017a450277657a5d5e9ad4a4878575cbb2c 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -2273,6 +2273,11 @@ static int mlx4_allocate_default_counters(struct mlx4_dev *dev)
                } else if (err == -ENOENT) {
                        err = 0;
                        continue;
+               } else if (mlx4_is_slave(dev) && err == -EINVAL) {
+                       priv->def_counter[port] = MLX4_SINK_COUNTER_INDEX(dev);
+                       mlx4_warn(dev, "can't allocate counter from old PF driver, using index %d\n",
+                                 MLX4_SINK_COUNTER_INDEX(dev));
+                       err = 0;
                } else {
                        mlx4_err(dev, "%s: failed to allocate default counter port %d err %d\n",
                                 __func__, port + 1, err);