[PATCH v2 4/4] vdpa/mlx5: Add RX counters to debugfs
From: Eli Cohen
Date: Wed Oct 19 2022 - 09:04:20 EST
For each interface, either VLAN tagged or untagged, add two hardware
counters: one for unicast and another for multicast. The counters count
RX packets and bytes and can be read through debugfs:
$ cat /sys/kernel/debug/mlx5/mlx5_core.sf.1/vdpa-0/rx/untagged/mcast/packets
$ cat /sys/kernel/debug/mlx5/mlx5_core.sf.1/vdpa-0/rx/untagged/ucast/bytes
This feature is controlled via the config option
MLX5_VDPA_STEERING_DEBUG. It is off by default as it may have some
impact on performance.
Issue: 3214718
Change-Id: I0ca5ba189d526a09047e6ebd4ee7c5a42e4282c2
Signed-off-by: Eli Cohen <elic@xxxxxxxxxx>
---
drivers/vdpa/Kconfig | 12 ++++
drivers/vdpa/mlx5/net/debug.c | 86 ++++++++++++++++++++++
drivers/vdpa/mlx5/net/mlx5_vnet.c | 114 +++++++++++++++++++++++-------
drivers/vdpa/mlx5/net/mlx5_vnet.h | 30 ++++++++
4 files changed, 215 insertions(+), 27 deletions(-)
diff --git a/drivers/vdpa/Kconfig b/drivers/vdpa/Kconfig
index 50f45d037611..43b716ec2d18 100644
--- a/drivers/vdpa/Kconfig
+++ b/drivers/vdpa/Kconfig
@@ -71,6 +71,18 @@ config MLX5_VDPA_NET
be executed by the hardware. It also supports a variety of stateless
offloads depending on the actual device used and firmware version.
+config MLX5_VDPA_STEERING_DEBUG
+ bool "expose steering counters on debugfs"
+ select MLX5_VDPA
+ help
+ Expose RX steering counters in debugfs to aid in debugging. For each VLAN
+ or non VLAN interface, two hardware counters are added to the RX flow
+ table: one for unicast and one for multicast.
+ The counters counts the number of packets and bytes and exposes them in
+ debugfs. Once can read the counters using, e.g.:
+ cat /sys/kernel/debug/mlx5/mlx5_core.sf.1/vdpa-0/rx/untagged/ucast/packets
+ cat /sys/kernel/debug/mlx5/mlx5_core.sf.1/vdpa-0/rx/untagged/mcast/bytes
+
config VP_VDPA
tristate "Virtio PCI bridge vDPA driver"
select VIRTIO_PCI_LIB
diff --git a/drivers/vdpa/mlx5/net/debug.c b/drivers/vdpa/mlx5/net/debug.c
index 95e4801df211..60d6ac68cdc4 100644
--- a/drivers/vdpa/mlx5/net/debug.c
+++ b/drivers/vdpa/mlx5/net/debug.c
@@ -49,6 +49,92 @@ void mlx5_vdpa_add_rx_flow_table(struct mlx5_vdpa_net *ndev)
ndev, &rx_flow_table_fops);
}
+#if defined(CONFIG_MLX5_VDPA_STEERING_DEBUG)
+static int packets_show(struct seq_file *file, void *priv)
+{
+ struct mlx5_vdpa_counter *counter = file->private;
+ u64 packets;
+ u64 bytes;
+ int err;
+
+ err = mlx5_fc_query(counter->mdev, counter->counter, &packets, &bytes);
+ if (err)
+ return err;
+
+ seq_printf(file, "0x%llx\n", packets);
+ return 0;
+}
+
+static int bytes_show(struct seq_file *file, void *priv)
+{
+ struct mlx5_vdpa_counter *counter = file->private;
+ u64 packets;
+ u64 bytes;
+ int err;
+
+ err = mlx5_fc_query(counter->mdev, counter->counter, &packets, &bytes);
+ if (err)
+ return err;
+
+ seq_printf(file, "0x%llx\n", bytes);
+ return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(packets);
+DEFINE_SHOW_ATTRIBUTE(bytes);
+
+static void add_counter_node(struct mlx5_vdpa_counter *counter,
+ struct dentry *parent)
+{
+ debugfs_create_file("packets", 0444, parent, counter,
+ &packets_fops);
+ debugfs_create_file("bytes", 0444, parent, counter,
+ &bytes_fops);
+}
+
+void mlx5_vdpa_add_rx_counters(struct mlx5_vdpa_net *ndev,
+ struct macvlan_node *node)
+{
+ static const char *ut = "untagged";
+ char vidstr[9];
+ u16 vid;
+
+ node->ucast_counter.mdev = ndev->mvdev.mdev;
+ node->mcast_counter.mdev = ndev->mvdev.mdev;
+ if (node->tagged) {
+ vid = key2vid(node->macvlan);
+ snprintf(vidstr, sizeof(vidstr), "0x%x", vid);
+ } else {
+ strcpy(vidstr, ut);
+ }
+
+ node->dent = debugfs_create_dir(vidstr, ndev->rx_dent);
+ if (IS_ERR(node->dent)) {
+ node->dent = NULL;
+ return;
+ }
+
+ node->ucast_counter.dent = debugfs_create_dir("ucast", node->dent);
+ if (IS_ERR(node->ucast_counter.dent))
+ return;
+
+ add_counter_node(&node->ucast_counter, node->ucast_counter.dent);
+
+ node->mcast_counter.dent = debugfs_create_dir("mcast", node->dent);
+ if (IS_ERR(node->mcast_counter.dent))
+ return;
+
+ add_counter_node(&node->mcast_counter, node->mcast_counter.dent);
+}
+
+void mlx5_vdpa_remove_rx_counters(struct mlx5_vdpa_net *ndev,
+ struct macvlan_node *node)
+{
+ if (node->dent && ndev->debugfs)
+ debugfs_remove_recursive(node->dent);
+}
+#endif
+
void mlx5_vdpa_add_debugfs(struct mlx5_vdpa_net *ndev)
{
struct mlx5_core_dev *mdev;
diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index b9353c642b85..4cc674a84c3c 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1404,12 +1404,56 @@ static void destroy_tir(struct mlx5_vdpa_net *ndev)
#define MAX_STEERING_ENT 0x8000
#define MAX_STEERING_GROUPS 2
+#if defined(CONFIG_MLX5_VDPA_STEERING_DEBUG)
+ #define NUM_DESTS 2
+#else
+ #define NUM_DESTS 1
+#endif
+
+static int add_steering_counters(struct mlx5_vdpa_net *ndev,
+ struct macvlan_node *node,
+ struct mlx5_flow_act *flow_act,
+ struct mlx5_flow_destination *dests)
+{
+#if defined(CONFIG_MLX5_VDPA_STEERING_DEBUG)
+ int err;
+
+ node->ucast_counter.counter = mlx5_fc_create(ndev->mvdev.mdev, false);
+ if (IS_ERR(node->ucast_counter.counter))
+ return PTR_ERR(node->ucast_counter.counter);
+
+ node->mcast_counter.counter = mlx5_fc_create(ndev->mvdev.mdev, false);
+ if (IS_ERR(node->mcast_counter.counter)) {
+ err = PTR_ERR(node->mcast_counter.counter);
+ goto err_mcast_counter;
+ }
+
+ dests[1].type = MLX5_FLOW_DESTINATION_TYPE_COUNTER;
+ dests[1].counter_id = mlx5_fc_id(node->ucast_counter.counter);
+ flow_act->action |= MLX5_FLOW_CONTEXT_ACTION_COUNT;
+ return 0;
+
+err_mcast_counter:
+ mlx5_fc_destroy(ndev->mvdev.mdev, node->ucast_counter.counter);
+ return err;
+#else
+ return 0;
+#endif
+}
+
+static void remove_steering_counters(struct mlx5_vdpa_net *ndev,
+ struct macvlan_node *node)
+{
+#if defined(CONFIG_MLX5_VDPA_STEERING_DEBUG)
+ mlx5_fc_destroy(ndev->mvdev.mdev, node->mcast_counter.counter);
+ mlx5_fc_destroy(ndev->mvdev.mdev, node->ucast_counter.counter);
+#endif
+}
+
static int mlx5_vdpa_add_mac_vlan_rules(struct mlx5_vdpa_net *ndev, u8 *mac,
- u16 vid, bool tagged,
- struct mlx5_flow_handle **ucast,
- struct mlx5_flow_handle **mcast)
+ struct macvlan_node *node)
{
- struct mlx5_flow_destination dest = {};
+ struct mlx5_flow_destination dests[NUM_DESTS] = {};
struct mlx5_flow_act flow_act = {};
struct mlx5_flow_handle *rule;
struct mlx5_flow_spec *spec;
@@ -1418,11 +1462,13 @@ static int mlx5_vdpa_add_mac_vlan_rules(struct mlx5_vdpa_net *ndev, u8 *mac,
u8 *dmac_c;
u8 *dmac_v;
int err;
+ u16 vid;
spec = kvzalloc(sizeof(*spec), GFP_KERNEL);
if (!spec)
return -ENOMEM;
+ vid = key2vid(node->macvlan);
spec->match_criteria_enable = MLX5_MATCH_OUTER_HEADERS;
headers_c = MLX5_ADDR_OF(fte_match_param, spec->match_criteria, outer_headers);
headers_v = MLX5_ADDR_OF(fte_match_param, spec->match_value, outer_headers);
@@ -1434,44 +1480,55 @@ static int mlx5_vdpa_add_mac_vlan_rules(struct mlx5_vdpa_net *ndev, u8 *mac,
MLX5_SET(fte_match_set_lyr_2_4, headers_c, cvlan_tag, 1);
MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, headers_c, first_vid);
}
- if (tagged) {
+ if (node->tagged) {
MLX5_SET(fte_match_set_lyr_2_4, headers_v, cvlan_tag, 1);
MLX5_SET(fte_match_set_lyr_2_4, headers_v, first_vid, vid);
}
flow_act.action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
- dest.type = MLX5_FLOW_DESTINATION_TYPE_TIR;
- dest.tir_num = ndev->res.tirn;
- rule = mlx5_add_flow_rules(ndev->rxft, spec, &flow_act, &dest, 1);
- if (IS_ERR(rule))
- return PTR_ERR(rule);
+ dests[0].type = MLX5_FLOW_DESTINATION_TYPE_TIR;
+ dests[0].tir_num = ndev->res.tirn;
+ err = add_steering_counters(ndev, node, &flow_act, dests);
+ if (err)
+ goto out_free;
+
+ node->ucast_rule = mlx5_add_flow_rules(ndev->rxft, spec, &flow_act, dests, NUM_DESTS);
+ if (IS_ERR(rule)) {
+ err = PTR_ERR(rule);
+ goto err_ucast;
+ }
- *ucast = rule;
+#if defined(CONFIG_MLX5_VDPA_STEERING_DEBUG)
+ dests[1].counter_id = mlx5_fc_id(node->mcast_counter.counter);
+#endif
memset(dmac_c, 0, ETH_ALEN);
memset(dmac_v, 0, ETH_ALEN);
dmac_c[0] = 1;
dmac_v[0] = 1;
- rule = mlx5_add_flow_rules(ndev->rxft, spec, &flow_act, &dest, 1);
- kvfree(spec);
+ node->mcast_rule = mlx5_add_flow_rules(ndev->rxft, spec, &flow_act, dests, NUM_DESTS);
if (IS_ERR(rule)) {
err = PTR_ERR(rule);
goto err_mcast;
}
-
- *mcast = rule;
+ kvfree(spec);
+ mlx5_vdpa_add_rx_counters(ndev, node);
return 0;
err_mcast:
- mlx5_del_flow_rules(*ucast);
+ mlx5_del_flow_rules(node->ucast_rule);
+err_ucast:
+ remove_steering_counters(ndev, node);
+out_free:
+ kvfree(spec);
return err;
}
static void mlx5_vdpa_del_mac_vlan_rules(struct mlx5_vdpa_net *ndev,
- struct mlx5_flow_handle *ucast,
- struct mlx5_flow_handle *mcast)
+ struct macvlan_node *node)
{
- mlx5_del_flow_rules(ucast);
- mlx5_del_flow_rules(mcast);
+ mlx5_vdpa_remove_rx_counters(ndev, node);
+ mlx5_del_flow_rules(node->ucast_rule);
+ mlx5_del_flow_rules(node->mcast_rule);
}
static u64 search_val(u8 *mac, u16 vlan, bool tagged)
@@ -1505,14 +1562,14 @@ static struct macvlan_node *mac_vlan_lookup(struct mlx5_vdpa_net *ndev, u64 valu
return NULL;
}
-static int mac_vlan_add(struct mlx5_vdpa_net *ndev, u8 *mac, u16 vlan, bool tagged) // vlan -> vid
+static int mac_vlan_add(struct mlx5_vdpa_net *ndev, u8 *mac, u16 vid, bool tagged)
{
struct macvlan_node *ptr;
u64 val;
u32 idx;
int err;
- val = search_val(mac, vlan, tagged);
+ val = search_val(mac, vid, tagged);
if (mac_vlan_lookup(ndev, val))
return -EEXIST;
@@ -1520,12 +1577,13 @@ static int mac_vlan_add(struct mlx5_vdpa_net *ndev, u8 *mac, u16 vlan, bool tagg
if (!ptr)
return -ENOMEM;
- err = mlx5_vdpa_add_mac_vlan_rules(ndev, ndev->config.mac, vlan, tagged,
- &ptr->ucast_rule, &ptr->mcast_rule);
+ ptr->tagged = tagged;
+ ptr->macvlan = val;
+ ptr->ndev = ndev;
+ err = mlx5_vdpa_add_mac_vlan_rules(ndev, ndev->config.mac, ptr);
if (err)
goto err_add;
- ptr->macvlan = val;
idx = hash_64(val, 8);
hlist_add_head(&ptr->hlist, &ndev->macvlan_hash[idx]);
return 0;
@@ -1544,7 +1602,8 @@ static void mac_vlan_del(struct mlx5_vdpa_net *ndev, u8 *mac, u16 vlan, bool tag
return;
hlist_del(&ptr->hlist);
- mlx5_vdpa_del_mac_vlan_rules(ndev, ptr->ucast_rule, ptr->mcast_rule);
+ mlx5_vdpa_del_mac_vlan_rules(ndev, ptr);
+ remove_steering_counters(ndev, ptr);
kfree(ptr);
}
@@ -1557,7 +1616,8 @@ static void clear_mac_vlan_table(struct mlx5_vdpa_net *ndev)
for (i = 0; i < MLX5V_MACVLAN_SIZE; i++) {
hlist_for_each_entry_safe(pos, n, &ndev->macvlan_hash[i], hlist) {
hlist_del(&pos->hlist);
- mlx5_vdpa_del_mac_vlan_rules(ndev, pos->ucast_rule, pos->mcast_rule);
+ mlx5_vdpa_del_mac_vlan_rules(ndev, pos);
+ remove_steering_counters(ndev, pos);
kfree(pos);
}
}
diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.h b/drivers/vdpa/mlx5/net/mlx5_vnet.h
index f2cef3925e5b..706c83016b71 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.h
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.h
@@ -21,6 +21,11 @@ struct mlx5_vdpa_net_resources {
#define MLX5V_MACVLAN_SIZE 256
+static inline u16 key2vid(u64 key)
+{
+ return (u16)(key >> 48);
+}
+
struct mlx5_vdpa_net {
struct mlx5_vdpa_dev mvdev;
struct mlx5_vdpa_net_resources res;
@@ -47,11 +52,24 @@ struct mlx5_vdpa_net {
struct dentry *debugfs;
};
+struct mlx5_vdpa_counter {
+ struct mlx5_fc *counter;
+ struct dentry *dent;
+ struct mlx5_core_dev *mdev;
+};
+
struct macvlan_node {
struct hlist_node hlist;
struct mlx5_flow_handle *ucast_rule;
struct mlx5_flow_handle *mcast_rule;
u64 macvlan;
+ struct mlx5_vdpa_net *ndev;
+ bool tagged;
+#if defined(CONFIG_MLX5_VDPA_STEERING_DEBUG)
+ struct dentry *dent;
+ struct mlx5_vdpa_counter ucast_counter;
+ struct mlx5_vdpa_counter mcast_counter;
+#endif
};
void mlx5_vdpa_add_debugfs(struct mlx5_vdpa_net *ndev);
@@ -60,5 +78,17 @@ void mlx5_vdpa_add_rx_flow_table(struct mlx5_vdpa_net *ndev);
void mlx5_vdpa_remove_rx_flow_table(struct mlx5_vdpa_net *ndev);
void mlx5_vdpa_add_tirn(struct mlx5_vdpa_net *ndev);
void mlx5_vdpa_remove_tirn(struct mlx5_vdpa_net *ndev);
+#if defined(CONFIG_MLX5_VDPA_STEERING_DEBUG)
+void mlx5_vdpa_add_rx_counters(struct mlx5_vdpa_net *ndev,
+ struct macvlan_node *node);
+void mlx5_vdpa_remove_rx_counters(struct mlx5_vdpa_net *ndev,
+ struct macvlan_node *node);
+#else
+static inline void mlx5_vdpa_add_rx_counters(struct mlx5_vdpa_net *ndev,
+ struct macvlan_node *node) {}
+static inline void mlx5_vdpa_remove_rx_counters(struct mlx5_vdpa_net *ndev,
+ struct macvlan_node *node) {}
+#endif
+
#endif /* __MLX5_VNET_H__ */
--
2.35.1