net/mlx4_core: Add explicit error message when rule doesn't meet configuration

When a given flow steering rule is invalid in respect to the current
steering configuration, print the correct error message to the system log.

Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 3 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/mcg.c b/drivers/net/ethernet/mellanox/mlx4/mcg.c
index 872843179f44..a3867e7ef885 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mcg.c
+++ b/drivers/net/ethernet/mellanox/mlx4/mcg.c
@@ -999,12 +999,27 @@ int mlx4_flow_attach(struct mlx4_dev *dev,
         }
 
         ret = mlx4_QP_FLOW_STEERING_ATTACH(dev, mailbox, size >> 2, reg_id);
-        if (ret == -ENOMEM)
+        if (ret == -ENOMEM) {
                 mlx4_err_rule(dev,
                               "mcg table is full. Fail to register network rule\n",
                               rule);
-        else if (ret)
-                mlx4_err_rule(dev, "Fail to register network rule\n", rule);
+        } else if (ret) {
+                if (ret == -ENXIO) {
+                        if (dev->caps.steering_mode != MLX4_STEERING_MODE_DEVICE_MANAGED)
+                                mlx4_err_rule(dev,
+                                              "DMFS is not enabled, "
+                                              "failed to register network rule.\n",
+                                              rule);
+                        else
+                                mlx4_err_rule(dev,
+                                              "Rule exceeds the dmfs_high_rate_mode limitations, "
+                                              "failed to register network rule.\n",
+                                              rule);
+
+                } else {
+                        mlx4_err_rule(dev, "Fail to register network rule.\n", rule);
+                }
+        }
 
         mlx4_free_cmd_mailbox(dev, mailbox);