net/mlx5e: Add vnic devlink health reporter to representors

Create a new devlink health reporter for representor interface, which
reports the values of representor vnic diagnostic counters when diagnosed.

This patch will allow admins to monitor VF diagnostic counters through
the representor-interface vnic reporter.

Example of usage:
$ devlink health diagnose pci/0000:08:00.0/65537 reporter vnic
  vNIC env counters:
    total_error_queues: 0 send_queue_priority_update_flow: 0
    comp_eq_overrun: 0 async_eq_overrun: 0 cq_overrun: 0
    invalid_command: 0 quota_exceeded_command: 0
    nic_receive_steering_discard: 0
Signed-off-by: Maher Sanalla <msanalla@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

Documentation/networking/device_drivers/ethernet/mellanox/mlx5/devlink.rst

@@ -285,5 +285,8 @@ steering but were discarded due to a mismatch in flow table.
 User commands examples:
 - Diagnose PF/VF vnic counters
         $ devlink health diagnose pci/0000:82:00.1 reporter vnic
+- Diagnose representor vnic counters (performed by supplying devlink port of the
+  representor, which can be obtained via devlink port command)
+        $ devlink health diagnose pci/0000:82:00.1/65537 reporter vnic
 
-NOTE: This command can run only on PF/VF ports.
+NOTE: This command can run over all interfaces such as PF/VF and representor ports.

drivers/net/ethernet/mellanox/mlx5/core/en_rep.c

@@ -53,6 +53,7 @@
 #include "lib/vxlan.h"
 #define CREATE_TRACE_POINTS
 #include "diag/en_rep_tracepoint.h"
+#include "diag/reporter_vnic.h"
 #include "en_accel/ipsec.h"
 #include "en/tc/int_port.h"
 #include "en/ptp.h"
@@ -1294,6 +1295,50 @@ static unsigned int mlx5e_ul_rep_stats_grps_num(struct mlx5e_priv *priv)
 	return ARRAY_SIZE(mlx5e_ul_rep_stats_grps);
 }
 
+static int
+mlx5e_rep_vnic_reporter_diagnose(struct devlink_health_reporter *reporter,
+				 struct devlink_fmsg *fmsg,
+				 struct netlink_ext_ack *extack)
+{
+	struct mlx5e_rep_priv *rpriv = devlink_health_reporter_priv(reporter);
+	struct mlx5_eswitch_rep *rep = rpriv->rep;
+
+	return mlx5_reporter_vnic_diagnose_counters(rep->esw->dev, fmsg,
+						    rep->vport, true);
+}
+
+static const struct devlink_health_reporter_ops mlx5_rep_vnic_reporter_ops = {
+	.name = "vnic",
+	.diagnose = mlx5e_rep_vnic_reporter_diagnose,
+};
+
+static void mlx5e_rep_vnic_reporter_create(struct mlx5e_priv *priv,
+					   struct devlink_port *dl_port)
+{
+	struct mlx5e_rep_priv *rpriv = priv->ppriv;
+	struct devlink_health_reporter *reporter;
+
+	reporter = devl_port_health_reporter_create(dl_port,
+						    &mlx5_rep_vnic_reporter_ops,
+						    0, rpriv);
+	if (IS_ERR(reporter)) {
+		mlx5_core_err(priv->mdev,
+			      "Failed to create representor vnic reporter, err = %ld\n",
+			      PTR_ERR(reporter));
+		return;
+	}
+
+	rpriv->rep_vnic_reporter = reporter;
+}
+
+static void mlx5e_rep_vnic_reporter_destroy(struct mlx5e_priv *priv)
+{
+	struct mlx5e_rep_priv *rpriv = priv->ppriv;
+
+	if (!IS_ERR_OR_NULL(rpriv->rep_vnic_reporter))
+		devl_health_reporter_destroy(rpriv->rep_vnic_reporter);
+}
+
 static const struct mlx5e_profile mlx5e_rep_profile = {
 	.init			= mlx5e_init_rep,
 	.cleanup		= mlx5e_cleanup_rep,
@@ -1394,8 +1439,10 @@ mlx5e_vport_vf_rep_load(struct mlx5_core_dev *dev, struct mlx5_eswitch_rep *rep)
 
 	dl_port = mlx5_esw_offloads_devlink_port(dev->priv.eswitch,
 						 rpriv->rep->vport);
-	if (dl_port)
+	if (dl_port) {
 		SET_NETDEV_DEVLINK_PORT(netdev, dl_port);
+		mlx5e_rep_vnic_reporter_create(priv, dl_port);
+	}
 
 	err = register_netdev(netdev);
 	if (err) {
@@ -1408,8 +1455,8 @@ mlx5e_vport_vf_rep_load(struct mlx5_core_dev *dev, struct mlx5_eswitch_rep *rep)
 	return 0;
 
 err_detach_netdev:
+	mlx5e_rep_vnic_reporter_destroy(priv);
 	mlx5e_detach_netdev(netdev_priv(netdev));
-
 err_cleanup_profile:
 	priv->profile->cleanup(priv);
 
@@ -1458,6 +1505,7 @@ mlx5e_vport_rep_unload(struct mlx5_eswitch_rep *rep)
 	}
 
 	unregister_netdev(netdev);
+	mlx5e_rep_vnic_reporter_destroy(priv);
 	mlx5e_detach_netdev(priv);
 	priv->profile->cleanup(priv);
 	mlx5e_destroy_netdev(priv);

drivers/net/ethernet/mellanox/mlx5/core/en_rep.h

@@ -118,6 +118,7 @@ struct mlx5e_rep_priv {
 	struct rtnl_link_stats64 prev_vf_vport_stats;
 	struct mlx5_flow_handle *send_to_vport_meta_rule;
 	struct rhashtable tc_ht;
+	struct devlink_health_reporter *rep_vnic_reporter;
 };
 
 static inline