Message-Id: <20230906113018.2856-21-aaptel@nvidia.com>
Date: Wed,  6 Sep 2023 11:30:18 +0000
From: Aurelien Aptel <aaptel@...dia.com>
To: linux-nvme@...ts.infradead.org,
	netdev@...r.kernel.org,
	sagi@...mberg.me,
	hch@....de,
	kbusch@...nel.org,
	axboe@...com,
	chaitanyak@...dia.com,
	davem@...emloft.net,
	kuba@...nel.org
Cc: Aurelien Aptel <aaptel@...dia.com>,
	aurelien.aptel@...il.com,
	smalin@...dia.com,
	malin1024@...il.com,
	ogerlitz@...dia.com,
	yorayz@...dia.com,
	borisp@...dia.com,
	galshalom@...dia.com,
	mgurtovoy@...dia.com
Subject: [PATCH v14 20/20] net/mlx5e: NVMEoTCP, statistics

NVMEoTCP offload statistics include both control and data path
statistic: counters for the netdev ddp ops, offloaded packets/bytes,
resync and dropped packets.

Expose the statistics using ulp_ddp_ops->get_stats()
instead of the regular statistics flow.

Signed-off-by: Ben Ben-Ishay <benishay@...dia.com>
Signed-off-by: Boris Pismenny <borisp@...dia.com>
Signed-off-by: Or Gerlitz <ogerlitz@...dia.com>
Signed-off-by: Yoray Zack <yorayz@...dia.com>
Signed-off-by: Shai Malin <smalin@...dia.com>
Signed-off-by: Aurelien Aptel <aaptel@...dia.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
---
 .../net/ethernet/mellanox/mlx5/core/Makefile  |  3 +-
 .../mellanox/mlx5/core/en_accel/nvmeotcp.c    | 54 ++++++++++++---
 .../mellanox/mlx5/core/en_accel/nvmeotcp.h    | 16 +++++
 .../mlx5/core/en_accel/nvmeotcp_rxtx.c        | 11 +++-
 .../mlx5/core/en_accel/nvmeotcp_stats.c       | 66 +++++++++++++++++++
 .../ethernet/mellanox/mlx5/core/en_stats.h    |  8 +++
 6 files changed, 146 insertions(+), 12 deletions(-)
 create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp_stats.c

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Makefile b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
index a2f22c29dea8..708f9c84435c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/Makefile
+++ b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
@@ -109,7 +109,8 @@ mlx5_core-$(CONFIG_MLX5_EN_TLS) += en_accel/ktls_stats.o \
 				   en_accel/fs_tcp.o en_accel/ktls.o en_accel/ktls_txrx.o \
 				   en_accel/ktls_tx.o en_accel/ktls_rx.o
 
-mlx5_core-$(CONFIG_MLX5_EN_NVMEOTCP) += en_accel/fs_tcp.o en_accel/nvmeotcp.o en_accel/nvmeotcp_rxtx.o
+mlx5_core-$(CONFIG_MLX5_EN_NVMEOTCP) += en_accel/fs_tcp.o en_accel/nvmeotcp.o \
+					en_accel/nvmeotcp_rxtx.o en_accel/nvmeotcp_stats.o
 
 mlx5_core-$(CONFIG_MLX5_SW_STEERING) += steering/dr_domain.o steering/dr_table.o \
 					steering/dr_matcher.o steering/dr_rule.o \
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.c
index c5bfc1578ddf..62bec2c8f9ca 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.c
@@ -615,9 +615,15 @@ mlx5e_nvmeotcp_queue_init(struct net_device *netdev,
 {
 	struct nvme_tcp_ddp_config *config = &tconfig->nvmeotcp;
 	struct mlx5e_priv *priv = netdev_priv(netdev);
+	struct mlx5e_nvmeotcp_sw_stats *sw_stats;
 	struct mlx5_core_dev *mdev = priv->mdev;
 	struct mlx5e_nvmeotcp_queue *queue;
 	int queue_id, err;
+	u32 channel_ix;
+
+	channel_ix = mlx5e_get_channel_ix_from_io_cpu(&priv->channels.params,
+						      config->io_cpu);
+	sw_stats = &priv->nvmeotcp->sw_stats;
 
 	if (tconfig->type != ULP_DDP_NVME) {
 		err = -EOPNOTSUPP;
@@ -644,11 +650,11 @@ mlx5e_nvmeotcp_queue_init(struct net_device *netdev,
 	queue->id = queue_id;
 	queue->dgst = config->dgst;
 	queue->pda = config->cpda;
-	queue->channel_ix = mlx5e_get_channel_ix_from_io_cpu(&priv->channels.params,
-							     config->io_cpu);
+	queue->channel_ix = channel_ix;
 	queue->size = config->queue_size;
 	queue->max_klms_per_wqe = MLX5E_MAX_KLM_PER_WQE(mdev);
 	queue->priv = priv;
+	queue->sw_stats = sw_stats;
 	init_completion(&queue->static_params_done);
 
 	err = mlx5e_nvmeotcp_queue_rx_init(queue, config, netdev);
@@ -660,6 +666,7 @@ mlx5e_nvmeotcp_queue_init(struct net_device *netdev,
 	if (err)
 		goto destroy_rx;
 
+	atomic64_inc(&sw_stats->rx_nvmeotcp_sk_add);
 	write_lock_bh(&sk->sk_callback_lock);
 	ulp_ddp_set_ctx(sk, queue);
 	write_unlock_bh(&sk->sk_callback_lock);
@@ -673,6 +680,7 @@ mlx5e_nvmeotcp_queue_init(struct net_device *netdev,
 free_queue:
 	kfree(queue);
 out:
+	atomic64_inc(&sw_stats->rx_nvmeotcp_sk_add_fail);
 	return err;
 }
 
@@ -686,6 +694,8 @@ mlx5e_nvmeotcp_queue_teardown(struct net_device *netdev,
 
 	queue = container_of(ulp_ddp_get_ctx(sk), struct mlx5e_nvmeotcp_queue, ulp_ddp_ctx);
 
+	atomic64_inc(&queue->sw_stats->rx_nvmeotcp_sk_del);
+
 	WARN_ON(refcount_read(&queue->ref_count) != 1);
 	mlx5e_nvmeotcp_destroy_rx(priv, queue, mdev);
 
@@ -817,25 +827,34 @@ mlx5e_nvmeotcp_ddp_setup(struct net_device *netdev,
 			 struct ulp_ddp_io *ddp)
 {
 	struct scatterlist *sg = ddp->sg_table.sgl;
+	struct mlx5e_nvmeotcp_sw_stats *sw_stats;
 	struct mlx5e_nvmeotcp_queue_entry *nvqt;
 	struct mlx5e_nvmeotcp_queue *queue;
 	struct mlx5_core_dev *mdev;
 	int i, size = 0, count = 0;
+	int ret = 0;
 
 	queue = container_of(ulp_ddp_get_ctx(sk),
 			     struct mlx5e_nvmeotcp_queue, ulp_ddp_ctx);
+	sw_stats = queue->sw_stats;
 	mdev = queue->priv->mdev;
 	count = dma_map_sg(mdev->device, ddp->sg_table.sgl, ddp->nents,
 			   DMA_FROM_DEVICE);
 
-	if (count <= 0)
-		return -EINVAL;
+	if (count <= 0) {
+		ret = -EINVAL;
+		goto ddp_setup_fail;
+	}
 
-	if (WARN_ON(count > mlx5e_get_max_sgl(mdev)))
-		return -ENOSPC;
+	if (WARN_ON(count > mlx5e_get_max_sgl(mdev))) {
+		ret = -ENOSPC;
+		goto ddp_setup_fail;
+	}
 
-	if (!mlx5e_nvmeotcp_validate_sgl(sg, count, READ_ONCE(netdev->mtu)))
-		return -EOPNOTSUPP;
+	if (!mlx5e_nvmeotcp_validate_sgl(sg, count, READ_ONCE(netdev->mtu))) {
+		ret = -EOPNOTSUPP;
+		goto ddp_setup_fail;
+	}
 
 	for (i = 0; i < count; i++)
 		size += sg_dma_len(&sg[i]);
@@ -847,8 +866,13 @@ mlx5e_nvmeotcp_ddp_setup(struct net_device *netdev,
 	nvqt->ccid_gen++;
 	nvqt->sgl_length = count;
 	mlx5e_nvmeotcp_post_klm_wqe(queue, KLM_UMR, ddp->command_id, count);
-
+	atomic64_inc(&sw_stats->rx_nvmeotcp_ddp_setup);
 	return 0;
+
+ddp_setup_fail:
+	dma_unmap_sg(mdev->device, ddp->sg_table.sgl, count, DMA_FROM_DEVICE);
+	atomic64_inc(&sw_stats->rx_nvmeotcp_ddp_setup_fail);
+	return ret;
 }
 
 void mlx5e_nvmeotcp_ctx_complete(struct mlx5e_icosq_wqe_info *wi)
@@ -895,6 +919,7 @@ mlx5e_nvmeotcp_ddp_teardown(struct net_device *netdev,
 	q_entry->queue = queue;
 
 	mlx5e_nvmeotcp_post_klm_wqe(queue, KLM_INV_UMR, ddp->command_id, 0);
+	atomic64_inc(&queue->sw_stats->rx_nvmeotcp_ddp_teardown);
 }
 
 static void
@@ -928,13 +953,21 @@ void mlx5e_nvmeotcp_put_queue(struct mlx5e_nvmeotcp_queue *queue)
 	}
 }
 
+static int mlx5e_ulp_ddp_get_stats(struct net_device *dev,
+				   struct netlink_ulp_ddp_stats *stats)
+{
+	struct mlx5e_priv *priv = netdev_priv(dev);
+
+	return mlx5e_nvmeotcp_get_stats(priv, stats);
+}
+
 int set_ulp_ddp_nvme_tcp(struct net_device *netdev, bool enable)
 {
 	struct mlx5e_priv *priv = netdev_priv(netdev);
 	struct mlx5e_params new_params;
 	int err = 0;
 
-	/* There may be offloaded queues when an ethtool callback to disable the feature is made.
+	/* There may be offloaded queues when an netlink callback to disable the feature is made.
 	 * Hence, we can't destroy the tcp flow-table since it may be referenced by the offload
 	 * related flows and we'll keep the 128B CQEs on the channel RQs. Also, since we don't
 	 * deref/destroy the fs tcp table when the feature is disabled, we don't ref it again
@@ -1016,6 +1049,7 @@ const struct ulp_ddp_dev_ops mlx5e_nvmeotcp_ops = {
 	.teardown = mlx5e_nvmeotcp_ddp_teardown,
 	.resync = mlx5e_nvmeotcp_ddp_resync,
 	.set_caps = mlx5e_ulp_ddp_set_caps,
+	.get_stats = mlx5e_ulp_ddp_get_stats,
 };
 
 void mlx5e_nvmeotcp_build_netdev(struct mlx5e_priv *priv)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.h b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.h
index a5cfd9e31be7..527f2a33e343 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.h
@@ -9,6 +9,15 @@
 #include "en.h"
 #include "en/params.h"
 
+struct mlx5e_nvmeotcp_sw_stats {
+	atomic64_t rx_nvmeotcp_sk_add;
+	atomic64_t rx_nvmeotcp_sk_add_fail;
+	atomic64_t rx_nvmeotcp_sk_del;
+	atomic64_t rx_nvmeotcp_ddp_setup;
+	atomic64_t rx_nvmeotcp_ddp_setup_fail;
+	atomic64_t rx_nvmeotcp_ddp_teardown;
+};
+
 struct mlx5e_nvmeotcp_queue_entry {
 	struct mlx5e_nvmeotcp_queue *queue;
 	u32 sgl_length;
@@ -52,6 +61,7 @@ struct mlx5e_nvmeotcp_queue_handler {
  *	@sk: The socket used by the NVMe-TCP queue
  *	@crc_rx: CRC Rx offload indication for this queue
  *	@priv: mlx5e netdev priv
+ *	@sw_stats: Global software statistics for nvmeotcp offload
  *	@static_params_done: Async completion structure for the initial umr mapping
  *	synchronization
  *	@sq_lock: Spin lock for the icosq
@@ -88,6 +98,7 @@ struct mlx5e_nvmeotcp_queue {
 	u8 crc_rx:1;
 	/* for ddp invalidate flow */
 	struct mlx5e_priv *priv;
+	struct mlx5e_nvmeotcp_sw_stats *sw_stats;
 	/* end of data-path section */
 
 	struct completion static_params_done;
@@ -97,6 +108,7 @@ struct mlx5e_nvmeotcp_queue {
 };
 
 struct mlx5e_nvmeotcp {
+	struct mlx5e_nvmeotcp_sw_stats sw_stats;
 	struct ida queue_ids;
 	struct rhashtable queue_hash;
 	bool enabled;
@@ -113,6 +125,7 @@ void mlx5e_nvmeotcp_ddp_inv_done(struct mlx5e_icosq_wqe_info *wi);
 void mlx5e_nvmeotcp_ctx_complete(struct mlx5e_icosq_wqe_info *wi);
 static inline void mlx5e_nvmeotcp_init_rx(struct mlx5e_priv *priv) {}
 void mlx5e_nvmeotcp_cleanup_rx(struct mlx5e_priv *priv);
+int mlx5e_nvmeotcp_get_stats(struct mlx5e_priv *priv, struct netlink_ulp_ddp_stats *stats);
 extern const struct ulp_ddp_dev_ops mlx5e_nvmeotcp_ops;
 #else
 
@@ -122,5 +135,8 @@ static inline void mlx5e_nvmeotcp_cleanup(struct mlx5e_priv *priv) {}
 static inline int set_ulp_ddp_nvme_tcp(struct net_device *dev, bool en) { return -EOPNOTSUPP; }
 static inline void mlx5e_nvmeotcp_init_rx(struct mlx5e_priv *priv) {}
 static inline void mlx5e_nvmeotcp_cleanup_rx(struct mlx5e_priv *priv) {}
+static inline int mlx5e_nvmeotcp_get_stats(struct mlx5e_priv *priv,
+					   struct netlink_ulp_ddp_stats *stats)
+{ return 0; }
 #endif
 #endif /* __MLX5E_NVMEOTCP_H__ */
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp_rxtx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp_rxtx.c
index 53a67ec72f0f..5c146de89905 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp_rxtx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp_rxtx.c
@@ -140,6 +140,7 @@ mlx5e_nvmeotcp_rebuild_rx_skb_nonlinear(struct mlx5e_rq *rq, struct sk_buff *skb
 	int ccoff, cclen, hlen, ccid, remaining, fragsz, to_copy = 0;
 	struct net_device *netdev = rq->netdev;
 	struct mlx5e_priv *priv = netdev_priv(netdev);
+	struct mlx5e_rq_stats *stats = rq->stats;
 	struct mlx5e_nvmeotcp_queue_entry *nqe;
 	skb_frag_t org_frags[MAX_SKB_FRAGS];
 	struct mlx5e_nvmeotcp_queue *queue;
@@ -151,12 +152,14 @@ mlx5e_nvmeotcp_rebuild_rx_skb_nonlinear(struct mlx5e_rq *rq, struct sk_buff *skb
 	queue = mlx5e_nvmeotcp_get_queue(priv->nvmeotcp, queue_id);
 	if (unlikely(!queue)) {
 		dev_kfree_skb_any(skb);
+		stats->nvmeotcp_drop++;
 		return false;
 	}
 
 	cqe128 = container_of(cqe, struct mlx5e_cqe128, cqe64);
 	if (cqe_is_nvmeotcp_resync(cqe)) {
 		nvmeotcp_update_resync(queue, cqe128);
+		stats->nvmeotcp_resync++;
 		mlx5e_nvmeotcp_put_queue(queue);
 		return true;
 	}
@@ -230,7 +233,8 @@ mlx5e_nvmeotcp_rebuild_rx_skb_nonlinear(struct mlx5e_rq *rq, struct sk_buff *skb
 						 org_nr_frags,
 						 frag_index);
 	}
-
+	stats->nvmeotcp_packets++;
+	stats->nvmeotcp_bytes += cclen;
 	mlx5e_nvmeotcp_put_queue(queue);
 	return true;
 }
@@ -242,6 +246,7 @@ mlx5e_nvmeotcp_rebuild_rx_skb_linear(struct mlx5e_rq *rq, struct sk_buff *skb,
 	int ccoff, cclen, hlen, ccid, remaining, fragsz, to_copy = 0;
 	struct net_device *netdev = rq->netdev;
 	struct mlx5e_priv *priv = netdev_priv(netdev);
+	struct mlx5e_rq_stats *stats = rq->stats;
 	struct mlx5e_nvmeotcp_queue_entry *nqe;
 	struct mlx5e_nvmeotcp_queue *queue;
 	struct mlx5e_cqe128 *cqe128;
@@ -251,12 +256,14 @@ mlx5e_nvmeotcp_rebuild_rx_skb_linear(struct mlx5e_rq *rq, struct sk_buff *skb,
 	queue = mlx5e_nvmeotcp_get_queue(priv->nvmeotcp, queue_id);
 	if (unlikely(!queue)) {
 		dev_kfree_skb_any(skb);
+		stats->nvmeotcp_drop++;
 		return false;
 	}
 
 	cqe128 = container_of(cqe, struct mlx5e_cqe128, cqe64);
 	if (cqe_is_nvmeotcp_resync(cqe)) {
 		nvmeotcp_update_resync(queue, cqe128);
+		stats->nvmeotcp_resync++;
 		mlx5e_nvmeotcp_put_queue(queue);
 		return true;
 	}
@@ -330,6 +337,8 @@ mlx5e_nvmeotcp_rebuild_rx_skb_linear(struct mlx5e_rq *rq, struct sk_buff *skb,
 				       hlen + cclen, remaining);
 	}
 
+	stats->nvmeotcp_packets++;
+	stats->nvmeotcp_bytes += cclen;
 	mlx5e_nvmeotcp_put_queue(queue);
 	return true;
 }
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp_stats.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp_stats.c
new file mode 100644
index 000000000000..a5f921447aab
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp_stats.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+// Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES.
+
+#include "en_accel/nvmeotcp.h"
+
+struct netlink_counter_map {
+	size_t eth_offset;
+	size_t mlx_offset;
+};
+
+#define DECLARE_ULP_SW_STAT(fld) \
+	{ offsetof(struct netlink_ulp_ddp_stats, fld), \
+	  offsetof(struct mlx5e_nvmeotcp_sw_stats, fld) }
+
+#define DECLARE_ULP_RQ_STAT(fld) \
+	{ offsetof(struct netlink_ulp_ddp_stats, rx_ ## fld), \
+	  offsetof(struct mlx5e_rq_stats, fld) }
+
+#define READ_CTR_ATOMIC64(ptr, dsc, i) \
+	atomic64_read((atomic64_t *)((char *)(ptr) + (dsc)[i].mlx_offset))
+
+#define READ_CTR(ptr, desc, i) \
+	(*((u64 *)((char *)(ptr) + (desc)[i].mlx_offset)))
+
+#define SET_ULP_STAT(ptr, desc, i, val) \
+	(*(u64 *)((char *)(ptr) + (desc)[i].eth_offset) = (val))
+
+/* Global counters */
+static const struct netlink_counter_map sw_stats_desc[] = {
+	DECLARE_ULP_SW_STAT(rx_nvmeotcp_sk_add),
+	DECLARE_ULP_SW_STAT(rx_nvmeotcp_sk_del),
+	DECLARE_ULP_SW_STAT(rx_nvmeotcp_ddp_setup),
+	DECLARE_ULP_SW_STAT(rx_nvmeotcp_ddp_setup_fail),
+	DECLARE_ULP_SW_STAT(rx_nvmeotcp_ddp_teardown),
+};
+
+/* Per-rx-queue counters */
+static const struct netlink_counter_map rq_stats_desc[] = {
+	DECLARE_ULP_RQ_STAT(nvmeotcp_drop),
+	DECLARE_ULP_RQ_STAT(nvmeotcp_resync),
+	DECLARE_ULP_RQ_STAT(nvmeotcp_packets),
+	DECLARE_ULP_RQ_STAT(nvmeotcp_bytes),
+};
+
+int mlx5e_nvmeotcp_get_stats(struct mlx5e_priv *priv, struct netlink_ulp_ddp_stats *stats)
+{
+	unsigned int i, ch, n = 0;
+
+	if (!priv->nvmeotcp)
+		return 0;
+
+	for (i = 0; i < ARRAY_SIZE(sw_stats_desc); i++, n++)
+		SET_ULP_STAT(stats, sw_stats_desc, i,
+			     READ_CTR_ATOMIC64(&priv->nvmeotcp->sw_stats, sw_stats_desc, i));
+
+	for (i = 0; i < ARRAY_SIZE(rq_stats_desc); i++, n++) {
+		u64 sum = 0;
+
+		for (ch = 0; ch < priv->stats_nch; ch++)
+			sum += READ_CTR(&priv->channel_stats[ch]->rq, rq_stats_desc, i);
+
+		SET_ULP_STAT(stats, rq_stats_desc, i, sum);
+	}
+
+	return n;
+}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h
index 176fa5976259..b8e0a36b382c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h
@@ -128,6 +128,8 @@ void mlx5e_stats_rmon_get(struct mlx5e_priv *priv,
 			  const struct ethtool_rmon_hist_range **ranges);
 void mlx5e_get_link_ext_stats(struct net_device *dev,
 			      struct ethtool_link_ext_stats *stats);
+struct netlink_ulp_ddp_stats;
+void mlx5e_stats_ulp_ddp_get(struct mlx5e_priv *priv, struct netlink_ulp_ddp_stats *stats);
 
 /* Concrete NIC Stats */
 
@@ -396,6 +398,12 @@ struct mlx5e_rq_stats {
 	u64 tls_resync_res_skip;
 	u64 tls_err;
 #endif
+#ifdef CONFIG_MLX5_EN_NVMEOTCP
+	u64 nvmeotcp_drop;
+	u64 nvmeotcp_resync;
+	u64 nvmeotcp_packets;
+	u64 nvmeotcp_bytes;
+#endif
 };
 
 struct mlx5e_sq_stats {
-- 
2.34.1

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