From: Tariq Toukan <tariqt@nvidia.com>
Date: Wed, 8 Jun 2022 07:52:31 +0300
Subject: net/mlx5: debugfs, Add num of in-use FW command interface slots
Patch-mainline: v6.0-rc1
Git-commit: e723f8662de7dd1750c876ee94da4900ab0d0277
References: jsc#PED-1549
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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/mellanox/mlx5/core/debugfs.c | 24 ++++++++++++++++++++++
1 file changed, 24 insertions(+)
--- a/drivers/net/ethernet/mellanox/mlx5/core/debugfs.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/debugfs.c
@@ -166,6 +166,28 @@ static const struct file_operations stat
.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
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);