net/mlx5e: Add per-channel counters infrastructure, use it upon TX timeout

Add per-channel counter ch#_eq_rearm to monitor how many lost interrupt
recovery actions happened upon TX timeouts.

Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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

@@ -561,6 +561,7 @@ struct mlx5e_channel {
 
 	/* data path - accessed per napi poll */
 	struct irq_desc *irq_desc;
+	struct mlx5e_ch_stats      stats;
 
 	/* control */
 	struct mlx5e_priv         *priv;

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

@@ -178,6 +178,7 @@ static void mlx5e_update_sw_counters(struct mlx5e_priv *priv)
 	struct mlx5e_sw_stats temp, *s = &temp;
 	struct mlx5e_rq_stats *rq_stats;
 	struct mlx5e_sq_stats *sq_stats;
+	struct mlx5e_ch_stats *ch_stats;
 	int i, j;
 
 	memset(s, 0, sizeof(*s));
@@ -185,6 +186,7 @@ static void mlx5e_update_sw_counters(struct mlx5e_priv *priv)
 		struct mlx5e_channel *c = priv->channels.c[i];
 
 		rq_stats = &c->rq.stats;
+		ch_stats = &c->stats;
 
 		s->rx_packets	+= rq_stats->packets;
 		s->rx_bytes	+= rq_stats->bytes;
@@ -209,6 +211,7 @@ static void mlx5e_update_sw_counters(struct mlx5e_priv *priv)
 		s->rx_cache_empty += rq_stats->cache_empty;
 		s->rx_cache_busy  += rq_stats->cache_busy;
 		s->rx_cache_waive += rq_stats->cache_waive;
+		s->ch_eq_rearm += ch_stats->eq_rearm;
 
 		for (j = 0; j < priv->channels.params.num_tc; j++) {
 			sq_stats = &c->sq[j].stats;
@@ -3781,6 +3784,7 @@ static bool mlx5e_tx_timeout_eq_recover(struct net_device *dev,
 		return false;
 
 	netdev_err(dev, "Recover %d eqes on EQ 0x%x\n", eqe_count, eq->eqn);
+	sq->channel->stats.eq_rearm++;
 	return true;
 }
 

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

@@ -71,6 +71,7 @@ static const struct counter_desc sw_stats_desc[] = {
 	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_cache_empty) },
 	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_cache_busy) },
 	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_cache_waive) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, ch_eq_rearm) },
 	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, link_down_events_phy) },
 };
 
@@ -767,12 +768,18 @@ static const struct counter_desc sq_stats_desc[] = {
 	{ MLX5E_DECLARE_TX_STAT(struct mlx5e_sq_stats, xmit_more) },
 };
 
+static const struct counter_desc ch_stats_desc[] = {
+	{ MLX5E_DECLARE_CH_STAT(struct mlx5e_ch_stats, eq_rearm) },
+};
+
 #define NUM_RQ_STATS			ARRAY_SIZE(rq_stats_desc)
 #define NUM_SQ_STATS			ARRAY_SIZE(sq_stats_desc)
+#define NUM_CH_STATS			ARRAY_SIZE(ch_stats_desc)
 
 static int mlx5e_grp_channels_get_num_stats(struct mlx5e_priv *priv)
 {
 	return (NUM_RQ_STATS * priv->channels.num) +
+		(NUM_CH_STATS * priv->channels.num) +
 		(NUM_SQ_STATS * priv->channels.num * priv->channels.params.num_tc);
 }
 
@@ -784,6 +791,11 @@ static int mlx5e_grp_channels_fill_strings(struct mlx5e_priv *priv, u8 *data,
 	if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
 		return idx;
 
+	for (i = 0; i < priv->channels.num; i++)
+		for (j = 0; j < NUM_CH_STATS; j++)
+			sprintf(data + (idx++) * ETH_GSTRING_LEN,
+				ch_stats_desc[j].format, i);
+
 	for (i = 0; i < priv->channels.num; i++)
 		for (j = 0; j < NUM_RQ_STATS; j++)
 			sprintf(data + (idx++) * ETH_GSTRING_LEN, rq_stats_desc[j].format, i);
@@ -807,6 +819,12 @@ static int mlx5e_grp_channels_fill_stats(struct mlx5e_priv *priv, u64 *data,
 	if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
 		return idx;
 
+	for (i = 0; i < channels->num; i++)
+		for (j = 0; j < NUM_CH_STATS; j++)
+			data[idx++] =
+				MLX5E_READ_CTR64_CPU(&channels->c[i]->stats,
+						     ch_stats_desc, j);
+
 	for (i = 0; i < channels->num; i++)
 		for (j = 0; j < NUM_RQ_STATS; j++)
 			data[idx++] =

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

@@ -44,6 +44,7 @@
 #define MLX5E_DECLARE_STAT(type, fld) #fld, offsetof(type, fld)
 #define MLX5E_DECLARE_RX_STAT(type, fld) "rx%d_"#fld, offsetof(type, fld)
 #define MLX5E_DECLARE_TX_STAT(type, fld) "tx%d_"#fld, offsetof(type, fld)
+#define MLX5E_DECLARE_CH_STAT(type, fld) "ch%d_"#fld, offsetof(type, fld)
 
 struct counter_desc {
 	char		format[ETH_GSTRING_LEN];
@@ -88,6 +89,7 @@ struct mlx5e_sw_stats {
 	u64 rx_cache_empty;
 	u64 rx_cache_busy;
 	u64 rx_cache_waive;
+	u64 ch_eq_rearm;
 
 	/* Special handling counters */
 	u64 link_down_events_phy;
@@ -192,6 +194,10 @@ struct mlx5e_sq_stats {
 	u64 dropped;
 };
 
+struct mlx5e_ch_stats {
+	u64 eq_rearm;
+};
+
 struct mlx5e_stats {
 	struct mlx5e_sw_stats sw;
 	struct mlx5e_qcounter_stats qcnt;