[PATCH net-next 4/5] eth: fbnic: report software Tx queue stats

[Jakub Kicinski <kuba@kernel.org>]

Gather and report software Tx queue stats - checksum stats
and queue stop / start.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/ethernet/meta/fbnic/fbnic_txrx.h  |  3 +++
 .../net/ethernet/meta/fbnic/fbnic_netdev.c    | 10 ++++++++
 drivers/net/ethernet/meta/fbnic/fbnic_txrx.c  | 23 +++++++++++++++----
 3 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_txrx.h b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.h
index 3fe4d1b6baad..57ae95a6cbfa 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_txrx.h
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.h
@@ -59,8 +59,11 @@ struct fbnic_queue_stats {
 	u64 dropped;
 	union {
 		struct {
+			u64 csum_partial;
 			u64 ts_packets;
 			u64 ts_lost;
+			u64 stop;
+			u64 wake;
 		} twq;
 		struct {
 			u64 alloc_failed;
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c b/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c
index ceb6d1de9bcf..b12672d1607e 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c
@@ -517,6 +517,7 @@ static void fbnic_get_queue_stats_tx(struct net_device *dev, int idx,
 	struct fbnic_net *fbn = netdev_priv(dev);
 	struct fbnic_ring *txr = fbn->tx[idx];
 	struct fbnic_queue_stats *stats;
+	u64 stop, wake, csum;
 	unsigned int start;
 	u64 bytes, packets;
 
@@ -528,10 +529,16 @@ static void fbnic_get_queue_stats_tx(struct net_device *dev, int idx,
 		start = u64_stats_fetch_begin(&stats->syncp);
 		bytes = stats->bytes;
 		packets = stats->packets;
+		csum = stats->twq.csum_partial;
+		stop = stats->twq.stop;
+		wake = stats->twq.wake;
 	} while (u64_stats_fetch_retry(&stats->syncp, start));
 
 	tx->bytes = bytes;
 	tx->packets = packets;
+	tx->needs_csum = csum;
+	tx->stop = stop;
+	tx->wake = wake;
 }
 
 static void fbnic_get_base_stats(struct net_device *dev,
@@ -542,6 +549,9 @@ static void fbnic_get_base_stats(struct net_device *dev,
 
 	tx->bytes = fbn->tx_stats.bytes;
 	tx->packets = fbn->tx_stats.packets;
+	tx->needs_csum = fbn->tx_stats.twq.csum_partial;
+	tx->stop = fbn->tx_stats.twq.stop;
+	tx->wake = fbn->tx_stats.twq.wake;
 
 	rx->bytes = fbn->rx_stats.bytes;
 	rx->packets = fbn->rx_stats.packets;
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c
index 66ba36fd3c08..24d2b528b66c 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c
@@ -113,6 +113,11 @@ static int fbnic_maybe_stop_tx(const struct net_device *dev,
 
 	res = netif_txq_maybe_stop(txq, fbnic_desc_unused(ring), size,
 				   FBNIC_TX_DESC_WAKEUP);
+	if (!res) {
+		u64_stats_update_begin(&ring->stats.syncp);
+		ring->stats.twq.stop++;
+		u64_stats_update_end(&ring->stats.syncp);
+	}
 
 	return !res;
 }
@@ -191,6 +196,9 @@ fbnic_tx_offloads(struct fbnic_ring *ring, struct sk_buff *skb, __le64 *meta)
 					skb->csum_offset / 2));
 
 	*meta |= cpu_to_le64(FBNIC_TWD_FLAG_REQ_CSO);
+	u64_stats_update_begin(&ring->stats.syncp);
+	ring->stats.twq.csum_partial++;
+	u64_stats_update_end(&ring->stats.syncp);
 
 	*meta |= cpu_to_le64(FIELD_PREP(FBNIC_TWD_L2_HLEN_MASK, l2len / 2) |
 			     FIELD_PREP(FBNIC_TWD_L3_IHLEN_MASK, i3len / 2));
@@ -460,9 +468,13 @@ static void fbnic_clean_twq0(struct fbnic_napi_vector *nv, int napi_budget,
 	ring->stats.packets += total_packets;
 	u64_stats_update_end(&ring->stats.syncp);
 
-	netif_txq_completed_wake(txq, total_packets, total_bytes,
-				 fbnic_desc_unused(ring),
-				 FBNIC_TX_DESC_WAKEUP);
+	if (!netif_txq_completed_wake(txq, total_packets, total_bytes,
+				      fbnic_desc_unused(ring),
+				      FBNIC_TX_DESC_WAKEUP)) {
+		u64_stats_update_begin(&ring->stats.syncp);
+		ring->stats.twq.wake++;
+		u64_stats_update_end(&ring->stats.syncp);
+	}
 }
 
 static void fbnic_clean_tsq(struct fbnic_napi_vector *nv,
@@ -1092,10 +1104,13 @@ void fbnic_aggregate_ring_tx_counters(struct fbnic_net *fbn,
 	fbn->tx_stats.bytes += stats->bytes;
 	fbn->tx_stats.packets += stats->packets;
 	fbn->tx_stats.dropped += stats->dropped;
+	fbn->tx_stats.twq.csum_partial += stats->twq.csum_partial;
 	fbn->tx_stats.twq.ts_lost += stats->twq.ts_lost;
 	fbn->tx_stats.twq.ts_packets += stats->twq.ts_packets;
+	fbn->tx_stats.twq.stop += stats->twq.stop;
+	fbn->tx_stats.twq.wake += stats->twq.wake;
 	/* Remember to add new stats here */
-	BUILD_BUG_ON(sizeof(fbn->tx_stats.twq) / 8 != 2);
+	BUILD_BUG_ON(sizeof(fbn->tx_stats.twq) / 8 != 5);
 }
 
 static void fbnic_remove_tx_ring(struct fbnic_net *fbn,
-- 
2.48.1