mlx4_en: Added self diagnostics test implementation

The selftest includes 5 features:
1. Interrupt test: Executing commands and receiving command completion
   on all our interrupt vectors.
2. Link test: Verifying we are connected to valid link partner.
3. Speed test: Check that we negotiated link speed correctly.
4. Registers test: Activate HW health check command.
5. Loopback test: Send a packet on loopback interface and catch it on RX side.

Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 44 insertions, 0 deletions

diff --git a/drivers/net/mlx4/eq.c b/drivers/net/mlx4/eq.c
index 6d7b2bf210c..552d0fce6f6 100644
--- a/drivers/net/mlx4/eq.c
+++ b/drivers/net/mlx4/eq.c
@@ -699,3 +699,47 @@ void mlx4_cleanup_eq_table(struct mlx4_dev *dev)
 
         kfree(priv->eq_table.uar_map);
 }
+
+/* A test that verifies that we can accept interrupts on all
+ * the irq vectors of the device.
+ * Interrupts are checked using the NOP command.
+ */
+int mlx4_test_interrupts(struct mlx4_dev *dev)
+{
+        struct mlx4_priv *priv = mlx4_priv(dev);
+        int i;
+        int err;
+
+        err = mlx4_NOP(dev);
+        /* When not in MSI_X, there is only one irq to check */
+        if (!(dev->flags & MLX4_FLAG_MSI_X))
+                return err;
+
+        /* A loop over all completion vectors, for each vector we will check
+         * whether it works by mapping command completions to that vector
+         * and performing a NOP command
+         */
+        for(i = 0; !err && (i < dev->caps.num_comp_vectors); ++i) {
+                /* Temporary use polling for command completions */
+                mlx4_cmd_use_polling(dev);
+
+                /* Map the new eq to handle all asyncronous events */
+                err = mlx4_MAP_EQ(dev, MLX4_ASYNC_EVENT_MASK, 0,
+                                  priv->eq_table.eq[i].eqn);
+                if (err) {
+                        mlx4_warn(dev, "Failed mapping eq for interrupt test\n");
+                        mlx4_cmd_use_events(dev);
+                        break;
+                }
+
+                /* Go back to using events */
+                mlx4_cmd_use_events(dev);
+                err = mlx4_NOP(dev);
+        }
+
+        /* Return to default */
+        mlx4_MAP_EQ(dev, MLX4_ASYNC_EVENT_MASK, 0,
+                    priv->eq_table.eq[dev->caps.num_comp_vectors].eqn);
+        return err;
+}
+EXPORT_SYMBOL(mlx4_test_interrupts);