net/mlx5: Add last command failure syndrome to debugfs

Add syndrome of last command failure per command type to debugfs to ease
debugging of such failure.
last_failed_syndrome - last command failed syndrome returned by FW.

Signed-off-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
index 26ba94c..0377392 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
@@ -1887,7 +1887,8 @@ out_in:
        return err;
 }
 
-static void cmd_status_log(struct mlx5_core_dev *dev, u16 opcode, u8 status, int err)
+static void cmd_status_log(struct mlx5_core_dev *dev, u16 opcode, u8 status,
+                          u32 syndrome, int err)
 {
        struct mlx5_cmd_stats *stats;
 
@@ -1902,6 +1903,7 @@ static void cmd_status_log(struct mlx5_core_dev *dev, u16 opcode, u8 status, int
        if (err == -EREMOTEIO) {
                stats->failed_mbox_status++;
                stats->last_failed_mbox_status = status;
+               stats->last_failed_syndrome = syndrome;
        }
        spin_unlock_irq(&stats->lock);
 }
@@ -1909,6 +1911,7 @@ static void cmd_status_log(struct mlx5_core_dev *dev, u16 opcode, u8 status, int
 /* preserve -EREMOTEIO for outbox.status != OK, otherwise return err as is */
 static int cmd_status_err(struct mlx5_core_dev *dev, int err, u16 opcode, void *out)
 {
+       u32 syndrome = MLX5_GET(mbox_out, out, syndrome);
        u8 status = MLX5_GET(mbox_out, out, status);
 
        if (err == -EREMOTEIO) /* -EREMOTEIO is preserved */
@@ -1917,7 +1920,7 @@ static int cmd_status_err(struct mlx5_core_dev *dev, int err, u16 opcode, void *
        if (!err && status != MLX5_CMD_STAT_OK)
                err = -EREMOTEIO;
 
-       cmd_status_log(dev, opcode, status, err);
+       cmd_status_log(dev, opcode, status, syndrome, err);
        return err;
 }
 

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/debugfs.c b/drivers/net/ethernet/mellanox/mlx5/core/debugfs.c
index 3d3e55a..9caa1b5 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/debugfs.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/debugfs.c
@@ -192,6 +192,8 @@ void mlx5_cmdif_debugfs_init(struct mlx5_core_dev *dev)
                                           &stats->last_failed_errno);
                        debugfs_create_u8("last_failed_mbox_status", 0400, stats->root,
                                          &stats->last_failed_mbox_status);
+                       debugfs_create_x32("last_failed_syndrome", 0400, stats->root,
+                                          &stats->last_failed_syndrome);
                }
        }
 }

diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index d6bac39..74c8cfb 100644 (file)
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -272,6 +272,8 @@ struct mlx5_cmd_stats {
        u32             last_failed_errno;
        /* last bad status returned by FW */
        u8              last_failed_mbox_status;
+       /* last command failed syndrome returned by FW */
+       u32             last_failed_syndrome;
        struct dentry  *root;
        /* protect command average calculations */
        spinlock_t      lock;