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net/mlx5: debugfs, Add num of in-use FW command interface slots

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Expose the number of busy / in-use slots in the FW command interface via
a read-only debugfs entry. This improves observability and helps in the
performance bottleneck analysis.

Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
This commit is contained in:
Tariq Toukan
2022-06-08 07:52:31 +03:00
committed by Saeed Mahameed
parent 606e6a72e2
commit e723f8662d
1 changed files with 24 additions and 0 deletions
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24
drivers/net/ethernet/mellanox/mlx5/core/debugfs.c
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@@ -166,6 +166,28 @@ static const struct file_operations stats_fops = {
.write = average_write,
};
static ssize_t slots_read(struct file *filp, char __user *buf, size_t count,
loff_t *pos)
{
struct mlx5_cmd *cmd;
char tbuf[6];
int weight;
int field;
int ret;
cmd = filp->private_data;
weight = bitmap_weight(&cmd->bitmask, cmd->max_reg_cmds);
field = cmd->max_reg_cmds - weight;
ret = snprintf(tbuf, sizeof(tbuf), "%d\n", field);
return simple_read_from_buffer(buf, count, pos, tbuf, ret);
}
static const struct file_operations slots_fops = {
.owner = THIS_MODULE,
.open = simple_open,
.read = slots_read,
};
void mlx5_cmdif_debugfs_init(struct mlx5_core_dev *dev)
{
struct mlx5_cmd_stats *stats;
@@ -176,6 +198,8 @@ void mlx5_cmdif_debugfs_init(struct mlx5_core_dev *dev)
cmd = &dev->priv.dbg.cmdif_debugfs;
*cmd = debugfs_create_dir("commands", dev->priv.dbg.dbg_root);
debugfs_create_file("slots_inuse", 0400, *cmd, &dev->cmd, &slots_fops);
for (i = 0; i < MLX5_CMD_OP_MAX; i++) {
stats = &dev->cmd.stats[i];
namep = mlx5_command_str(i);