net/mlx5e: Add mlx5e HV VHCA stats agent

HV VHCA stats agent is responsible on running a preiodic rx/tx
packets/bytes stats update. Currently the supported format is version
MLX5_HV_VHCA_STATS_VERSION. Block ID 1 is dedicated for statistics data
transfer from the VF to the PF.

The reporter fetch the statistics data from all opened channels, fill it
in a buffer and send it to mlx5_hv_vhca_write_agent.

As the stats layer should include some metadata per block (sequence and
offset), the HV VHCA layer shall modify the buffer before actually send it
over block 1.

Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx5/core/Makefile

@@ -36,6 +36,7 @@ mlx5_core-$(CONFIG_MLX5_CORE_EN_DCB) += en_dcbnl.o en/port_buffer.o
 mlx5_core-$(CONFIG_MLX5_ESWITCH)     += en_rep.o en_tc.o en/tc_tun.o lib/port_tun.o lag_mp.o \
 					lib/geneve.o en/tc_tun_vxlan.o en/tc_tun_gre.o \
 					en/tc_tun_geneve.o diag/en_tc_tracepoint.o
+mlx5_core-$(CONFIG_PCI_HYPERV_INTERFACE) += en/hv_vhca_stats.o
 
 #
 # Core extra

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

@@ -54,6 +54,7 @@
 #include "mlx5_core.h"
 #include "en_stats.h"
 #include "en/fs.h"
+#include "lib/hv_vhca.h"
 
 extern const struct net_device_ops mlx5e_netdev_ops;
 struct page_pool;
@@ -782,6 +783,15 @@ struct mlx5e_modify_sq_param {
 	int rl_index;
 };
 
+#if IS_ENABLED(CONFIG_PCI_HYPERV_INTERFACE)
+struct mlx5e_hv_vhca_stats_agent {
+	struct mlx5_hv_vhca_agent *agent;
+	struct delayed_work        work;
+	u16                        delay;
+	void                      *buf;
+};
+#endif
+
 struct mlx5e_xsk {
 	/* UMEMs are stored separately from channels, because we don't want to
 	 * lose them when channels are recreated. The kernel also stores UMEMs,
@@ -853,6 +863,9 @@ struct mlx5e_priv {
 	struct devlink_health_reporter *tx_reporter;
 	struct devlink_health_reporter *rx_reporter;
 	struct mlx5e_xsk           xsk;
+#if IS_ENABLED(CONFIG_PCI_HYPERV_INTERFACE)
+	struct mlx5e_hv_vhca_stats_agent stats_agent;
+#endif
 };
 
 struct mlx5e_profile {

drivers/net/ethernet/mellanox/mlx5/core/en/hv_vhca_stats.c

@@ -0,0 +1,162 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+// Copyright (c) 2018 Mellanox Technologies
+
+#include "en.h"
+#include "en/hv_vhca_stats.h"
+#include "lib/hv_vhca.h"
+#include "lib/hv.h"
+
+struct mlx5e_hv_vhca_per_ring_stats {
+	u64     rx_packets;
+	u64     rx_bytes;
+	u64     tx_packets;
+	u64     tx_bytes;
+};
+
+static void
+mlx5e_hv_vhca_fill_ring_stats(struct mlx5e_priv *priv, int ch,
+			      struct mlx5e_hv_vhca_per_ring_stats *data)
+{
+	struct mlx5e_channel_stats *stats;
+	int tc;
+
+	stats = &priv->channel_stats[ch];
+	data->rx_packets = stats->rq.packets;
+	data->rx_bytes   = stats->rq.bytes;
+
+	for (tc = 0; tc < priv->max_opened_tc; tc++) {
+		data->tx_packets += stats->sq[tc].packets;
+		data->tx_bytes   += stats->sq[tc].bytes;
+	}
+}
+
+static void mlx5e_hv_vhca_fill_stats(struct mlx5e_priv *priv, u64 *data,
+				     int buf_len)
+{
+	int ch, i = 0;
+
+	for (ch = 0; ch < priv->max_nch; ch++) {
+		u64 *buf = data + i;
+
+		if (WARN_ON_ONCE(buf +
+				 sizeof(struct mlx5e_hv_vhca_per_ring_stats) >
+				 data + buf_len))
+			return;
+
+		mlx5e_hv_vhca_fill_ring_stats(priv, ch,
+					      (struct mlx5e_hv_vhca_per_ring_stats *)buf);
+		i += sizeof(struct mlx5e_hv_vhca_per_ring_stats) / sizeof(u64);
+	}
+}
+
+static int mlx5e_hv_vhca_stats_buf_size(struct mlx5e_priv *priv)
+{
+	return (sizeof(struct mlx5e_hv_vhca_per_ring_stats) *
+		priv->max_nch);
+}
+
+static void mlx5e_hv_vhca_stats_work(struct work_struct *work)
+{
+	struct mlx5e_hv_vhca_stats_agent *sagent;
+	struct mlx5_hv_vhca_agent *agent;
+	struct delayed_work *dwork;
+	struct mlx5e_priv *priv;
+	int buf_len, rc;
+	void *buf;
+
+	dwork = to_delayed_work(work);
+	sagent = container_of(dwork, struct mlx5e_hv_vhca_stats_agent, work);
+	priv = container_of(sagent, struct mlx5e_priv, stats_agent);
+	buf_len = mlx5e_hv_vhca_stats_buf_size(priv);
+	agent = sagent->agent;
+	buf = sagent->buf;
+
+	memset(buf, 0, buf_len);
+	mlx5e_hv_vhca_fill_stats(priv, buf, buf_len);
+
+	rc = mlx5_hv_vhca_agent_write(agent, buf, buf_len);
+	if (rc) {
+		mlx5_core_err(priv->mdev,
+			      "%s: Failed to write stats, err = %d\n",
+			      __func__, rc);
+		return;
+	}
+
+	if (sagent->delay)
+		queue_delayed_work(priv->wq, &sagent->work, sagent->delay);
+}
+
+enum {
+	MLX5_HV_VHCA_STATS_VERSION     = 1,
+	MLX5_HV_VHCA_STATS_UPDATE_ONCE = 0xFFFF,
+};
+
+static void mlx5e_hv_vhca_stats_control(struct mlx5_hv_vhca_agent *agent,
+					struct mlx5_hv_vhca_control_block *block)
+{
+	struct mlx5e_hv_vhca_stats_agent *sagent;
+	struct mlx5e_priv *priv;
+
+	priv = mlx5_hv_vhca_agent_priv(agent);
+	sagent = &priv->stats_agent;
+
+	block->version = MLX5_HV_VHCA_STATS_VERSION;
+	block->rings   = priv->max_nch;
+
+	if (!block->command) {
+		cancel_delayed_work_sync(&priv->stats_agent.work);
+		return;
+	}
+
+	sagent->delay = block->command == MLX5_HV_VHCA_STATS_UPDATE_ONCE ? 0 :
+			msecs_to_jiffies(block->command * 100);
+
+	queue_delayed_work(priv->wq, &sagent->work, sagent->delay);
+}
+
+static void mlx5e_hv_vhca_stats_cleanup(struct mlx5_hv_vhca_agent *agent)
+{
+	struct mlx5e_priv *priv = mlx5_hv_vhca_agent_priv(agent);
+
+	cancel_delayed_work_sync(&priv->stats_agent.work);
+}
+
+int mlx5e_hv_vhca_stats_create(struct mlx5e_priv *priv)
+{
+	int buf_len = mlx5e_hv_vhca_stats_buf_size(priv);
+	struct mlx5_hv_vhca_agent *agent;
+
+	priv->stats_agent.buf = kvzalloc(buf_len, GFP_KERNEL);
+	if (!priv->stats_agent.buf)
+		return -ENOMEM;
+
+	agent = mlx5_hv_vhca_agent_create(priv->mdev->hv_vhca,
+					  MLX5_HV_VHCA_AGENT_STATS,
+					  mlx5e_hv_vhca_stats_control, NULL,
+					  mlx5e_hv_vhca_stats_cleanup,
+					  priv);
+
+	if (IS_ERR_OR_NULL(agent)) {
+		if (IS_ERR(agent))
+			netdev_warn(priv->netdev,
+				    "Failed to create hv vhca stats agent, err = %ld\n",
+				    PTR_ERR(agent));
+
+		kfree(priv->stats_agent.buf);
+		return IS_ERR_OR_NULL(agent);
+	}
+
+	priv->stats_agent.agent = agent;
+	INIT_DELAYED_WORK(&priv->stats_agent.work, mlx5e_hv_vhca_stats_work);
+
+	return 0;
+}
+
+void mlx5e_hv_vhca_stats_destroy(struct mlx5e_priv *priv)
+{
+	if (IS_ERR_OR_NULL(priv->stats_agent.agent))
+		return;
+
+	mlx5_hv_vhca_agent_destroy(priv->stats_agent.agent);
+	kfree(priv->stats_agent.buf);
+}

drivers/net/ethernet/mellanox/mlx5/core/en/hv_vhca_stats.h

@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/* Copyright (c) 2019 Mellanox Technologies. */
+
+#ifndef __MLX5_EN_STATS_VHCA_H__
+#define __MLX5_EN_STATS_VHCA_H__
+#include "en.h"
+
+#if IS_ENABLED(CONFIG_PCI_HYPERV_INTERFACE)
+
+int mlx5e_hv_vhca_stats_create(struct mlx5e_priv *priv);
+void mlx5e_hv_vhca_stats_destroy(struct mlx5e_priv *priv);
+
+#else
+
+static inline int mlx5e_hv_vhca_stats_create(struct mlx5e_priv *priv)
+{
+	return 0;
+}
+
+static inline void mlx5e_hv_vhca_stats_destroy(struct mlx5e_priv *priv)
+{
+}
+#endif
+
+#endif /* __MLX5_EN_STATS_VHCA_H__ */

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

@@ -62,6 +62,7 @@
 #include "en/xsk/setup.h"
 #include "en/xsk/rx.h"
 #include "en/xsk/tx.h"
+#include "en/hv_vhca_stats.h"
 
 
 bool mlx5e_check_fragmented_striding_rq_cap(struct mlx5_core_dev *mdev)
@@ -5109,6 +5110,7 @@ static void mlx5e_nic_enable(struct mlx5e_priv *priv)
 	if (mlx5e_monitor_counter_supported(priv))
 		mlx5e_monitor_counter_init(priv);
 
+	mlx5e_hv_vhca_stats_create(priv);
 	if (netdev->reg_state != NETREG_REGISTERED)
 		return;
 #ifdef CONFIG_MLX5_CORE_EN_DCB
@@ -5141,6 +5143,7 @@ static void mlx5e_nic_disable(struct mlx5e_priv *priv)
 
 	queue_work(priv->wq, &priv->set_rx_mode_work);
 
+	mlx5e_hv_vhca_stats_destroy(priv);
 	if (mlx5e_monitor_counter_supported(priv))
 		mlx5e_monitor_counter_cleanup(priv);
 

drivers/net/ethernet/mellanox/mlx5/core/lib/hv_vhca.h

@@ -13,6 +13,7 @@ struct mlx5_hv_vhca_control_block;
 
 enum mlx5_hv_vhca_agent_type {
 	MLX5_HV_VHCA_AGENT_CONTROL = 0,
+	MLX5_HV_VHCA_AGENT_STATS   = 1,
 	MLX5_HV_VHCA_AGENT_MAX = 32,
 };