[PATCH mlx5-next 05/12] net/mlx5: Rate limit errors in command interface

[Leon Romanovsky]

From: Leon Romanovsky <leo...@mellanox.com>

Any error status returned by FW will trigger similar
to the following error message in the dmesg.

[   55.884355] mlx5_core 0000:00:04.0: mlx5_cmd_check:712:(pid 555):
ALLOC_UAR(0x802) op_mod(0x0) failed, status limits exceeded(0x8),
syndrome (0x0)

Those prints are extremely valuable to diagnose issues with running
system and it is important to keep them. However, not-so-careful user
can trigger endless number of such prints by depleting HW resources
and will spam dmesg.

Rate limiting of such messages solves this issue.

Signed-off-by: Leon Romanovsky <leo...@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/cmd.c       | 11 ++++-------
 drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h |  6 ++++++
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c 
b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
index 9d03a202abb1..7dd878b00196 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
@@ -717,13 +717,10 @@ static int mlx5_cmd_check(struct mlx5_core_dev *dev, void 
*in, void *out)
        uid    = MLX5_GET(mbox_in, in, uid);
 
        if (!uid && opcode != MLX5_CMD_OP_DESTROY_MKEY)
-               mlx5_core_err(dev,
-                     "%s(0x%x) op_mod(0x%x) failed, status %s(0x%x), syndrome 
(0x%x)\n",
-                     mlx5_command_str(opcode),
-                     opcode, op_mod,
-                     cmd_status_str(status),
-                     status,
-                     syndrome);
+               mlx5_core_err_rl(dev,
+                       "%s(0x%x) op_mod(0x%x) failed, status %s(0x%x), 
syndrome (0x%x)\n",
+                       mlx5_command_str(opcode), opcode, op_mod,
+                       cmd_status_str(status), status, syndrome);
        else
                mlx5_core_dbg(dev,
                      "%s(0x%x) op_mod(0x%x) failed, status %s(0x%x), syndrome 
(0x%x)\n",
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h 
b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
index 023882d9a22e..49955117ae36 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
@@ -66,6 +66,12 @@ do {                                                         
        \
                __func__, __LINE__, current->pid,       \
               ##__VA_ARGS__)
 
+#define mlx5_core_err_rl(__dev, format, ...)                           \
+       dev_err_ratelimited(&(__dev)->pdev->dev,                        \
+                          "%s:%d:(pid %d): " format,                   \
+                          __func__, __LINE__, current->pid,            \
+                          ##__VA_ARGS__)
+
 #define mlx5_core_warn(__dev, format, ...)                             \
        dev_warn(&(__dev)->pdev->dev, "%s:%d:(pid %d): " format,        \
                 __func__, __LINE__, current->pid,                      \
-- 
2.14.4