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Date: Tue, 10 Jan 2023 21:30:38 -0800
From: Saeed Mahameed <saeed@...nel.org>
To: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Eric Dumazet <edumazet@...gle.com>
Cc: Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
Tariq Toukan <tariqt@...dia.com>, Gal Pressman <gal@...dia.com>
Subject: [net-next 08/15] net/mlx5e: Add hairpin debugfs files
From: Gal Pressman <gal@...dia.com>
We refer to a TC NIC rule that involves forwarding as "hairpin".
Hairpin queues are mlx5 hardware specific implementation for hardware
forwarding of such packets.
For debug purposes, introduce debugfs files which:
* Expose the number of active hairpins
* Dump the hairpin table
* Allow control over the number and size of the hairpin queues instead
of the hard-coded values.
This allows us to get visibility of the feature in order to improve it
for next generation hardware.
Add debugfs files:
fs/tc/hairpin_num_active
fs/tc/hairpin_num_queues
fs/tc/hairpin_queue_size
fs/tc/hairpin_table_dump
Note that the new values will only take effect on the next queues
creation, it does not affect existing queues.
Signed-off-by: Gal Pressman <gal@...dia.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
.../net/ethernet/mellanox/mlx5/core/en_tc.c | 117 ++++++++++++++++++
1 file changed, 117 insertions(+)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 800442eaf9b4..99a7edb88661 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -100,6 +100,7 @@ struct mlx5e_tc_table {
struct mlx5_tc_ct_priv *ct;
struct mapping_ctx *mapping;
struct mlx5e_hairpin_params hairpin_params;
+ struct dentry *dfs_root;
};
struct mlx5e_tc_attr_to_reg_mapping mlx5e_tc_attr_to_reg_mappings[] = {
@@ -1023,6 +1024,118 @@ static int mlx5e_hairpin_get_prio(struct mlx5e_priv *priv,
return 0;
}
+static int debugfs_hairpin_queues_set(void *data, u64 val)
+{
+ struct mlx5e_hairpin_params *hp = data;
+
+ if (!val) {
+ mlx5_core_err(hp->mdev,
+ "Number of hairpin queues must be > 0\n");
+ return -EINVAL;
+ }
+
+ hp->num_queues = val;
+
+ return 0;
+}
+
+static int debugfs_hairpin_queues_get(void *data, u64 *val)
+{
+ struct mlx5e_hairpin_params *hp = data;
+
+ *val = hp->num_queues;
+
+ return 0;
+}
+DEFINE_DEBUGFS_ATTRIBUTE(fops_hairpin_queues, debugfs_hairpin_queues_get,
+ debugfs_hairpin_queues_set, "%llu\n");
+
+static int debugfs_hairpin_queue_size_set(void *data, u64 val)
+{
+ struct mlx5e_hairpin_params *hp = data;
+
+ if (val > BIT(MLX5_CAP_GEN(hp->mdev, log_max_hairpin_num_packets))) {
+ mlx5_core_err(hp->mdev,
+ "Invalid hairpin queue size, must be <= %lu\n",
+ BIT(MLX5_CAP_GEN(hp->mdev,
+ log_max_hairpin_num_packets)));
+ return -EINVAL;
+ }
+
+ hp->queue_size = roundup_pow_of_two(val);
+
+ return 0;
+}
+
+static int debugfs_hairpin_queue_size_get(void *data, u64 *val)
+{
+ struct mlx5e_hairpin_params *hp = data;
+
+ *val = hp->queue_size;
+
+ return 0;
+}
+DEFINE_DEBUGFS_ATTRIBUTE(fops_hairpin_queue_size,
+ debugfs_hairpin_queue_size_get,
+ debugfs_hairpin_queue_size_set, "%llu\n");
+
+static int debugfs_hairpin_num_active_get(void *data, u64 *val)
+{
+ struct mlx5e_tc_table *tc = data;
+ struct mlx5e_hairpin_entry *hpe;
+ u32 cnt = 0;
+ u32 bkt;
+
+ mutex_lock(&tc->hairpin_tbl_lock);
+ hash_for_each(tc->hairpin_tbl, bkt, hpe, hairpin_hlist)
+ cnt++;
+ mutex_unlock(&tc->hairpin_tbl_lock);
+
+ *val = cnt;
+
+ return 0;
+}
+DEFINE_DEBUGFS_ATTRIBUTE(fops_hairpin_num_active,
+ debugfs_hairpin_num_active_get, NULL, "%llu\n");
+
+static int debugfs_hairpin_table_dump_show(struct seq_file *file, void *priv)
+
+{
+ struct mlx5e_tc_table *tc = file->private;
+ struct mlx5e_hairpin_entry *hpe;
+ u32 bkt;
+
+ mutex_lock(&tc->hairpin_tbl_lock);
+ hash_for_each(tc->hairpin_tbl, bkt, hpe, hairpin_hlist)
+ seq_printf(file, "Hairpin peer_vhca_id %u prio %u refcnt %u\n",
+ hpe->peer_vhca_id, hpe->prio,
+ refcount_read(&hpe->refcnt));
+ mutex_unlock(&tc->hairpin_tbl_lock);
+
+ return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(debugfs_hairpin_table_dump);
+
+static void mlx5e_tc_debugfs_init(struct mlx5e_tc_table *tc,
+ struct dentry *dfs_root)
+{
+ if (IS_ERR_OR_NULL(dfs_root))
+ return;
+
+ tc->dfs_root = debugfs_create_dir("tc", dfs_root);
+ if (!tc->dfs_root)
+ return;
+
+ debugfs_create_file("hairpin_num_queues", 0644, tc->dfs_root,
+ &tc->hairpin_params, &fops_hairpin_queues);
+ debugfs_create_file("hairpin_queue_size", 0644, tc->dfs_root,
+ &tc->hairpin_params, &fops_hairpin_queue_size);
+ debugfs_create_file("hairpin_num_active", 0444, tc->dfs_root, tc,
+ &fops_hairpin_num_active);
+ debugfs_create_file("hairpin_table_dump", 0444, tc->dfs_root, tc,
+ &debugfs_hairpin_table_dump_fops);
+}
+
static void
mlx5e_hairpin_params_init(struct mlx5e_hairpin_params *hairpin_params,
struct mlx5_core_dev *mdev)
@@ -5249,6 +5362,8 @@ int mlx5e_tc_nic_init(struct mlx5e_priv *priv)
goto err_reg;
}
+ mlx5e_tc_debugfs_init(tc, mlx5e_fs_get_debugfs_root(priv->fs));
+
return 0;
err_reg:
@@ -5277,6 +5392,8 @@ void mlx5e_tc_nic_cleanup(struct mlx5e_priv *priv)
{
struct mlx5e_tc_table *tc = mlx5e_fs_get_tc(priv->fs);
+ debugfs_remove_recursive(tc->dfs_root);
+
if (tc->netdevice_nb.notifier_call)
unregister_netdevice_notifier_dev_net(priv->netdev,
&tc->netdevice_nb,
--
2.39.0
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