netdev - [PATCH net-next 5/6] sfc: implement per-queue TSO (hw

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Message-ID: <35782d70ad89c72d5dc819f9a12b2e5b4e742141.1724852597.git.ecree.xilinx@gmail.com>
Date: Wed, 28 Aug 2024 14:45:14 +0100
From: <edward.cree@....com>
To: <linux-net-drivers@....com>, <davem@...emloft.net>, <kuba@...nel.org>,
	<edumazet@...gle.com>, <pabeni@...hat.com>
CC: Edward Cree <ecree.xilinx@...il.com>, <netdev@...r.kernel.org>
Subject: [PATCH net-next 5/6] sfc: implement per-queue TSO (hw_gso) stats

From: Edward Cree <ecree.xilinx@...il.com>

Signed-off-by: Edward Cree <ecree.xilinx@...il.com>
---
 drivers/net/ethernet/sfc/efx.c        | 20 +++++++++++++++++---
 drivers/net/ethernet/sfc/net_driver.h |  4 ++++
 drivers/net/ethernet/sfc/tx_common.c  |  2 ++
 3 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c
index 8b46d143b6c7..bf06fbcdcbff 100644
--- a/drivers/net/ethernet/sfc/efx.c
+++ b/drivers/net/ethernet/sfc/efx.c
@@ -653,14 +653,21 @@ static void efx_get_queue_stats_tx(struct net_device *net_dev, int idx,
 
 	channel = efx_get_tx_channel(efx, idx);
 	stats->packets = 0;
+	stats->hw_gso_packets = 0;
+	stats->hw_gso_wire_packets = 0;
 	/* If a TX channel has XDP TXQs, the stats for these will be counted
 	 * under the channel rather than in base stats.  Unclear whether this
 	 * is correct behaviour, but we can't reliably exclude XDP TXes from
 	 * these stats anyway because in EFX_XDP_TX_QUEUES_BORROWED we use
 	 * the same TXQ as the core.
 	 */
-	efx_for_each_channel_tx_queue(tx_queue, channel)
+	efx_for_each_channel_tx_queue(tx_queue, channel) {
 		stats->packets += tx_queue->tx_packets - tx_queue->old_tx_packets;
+		stats->hw_gso_packets += tx_queue->tso_bursts -
+					 tx_queue->old_tso_bursts;
+		stats->hw_gso_wire_packets += tx_queue->tso_packets -
+					      tx_queue->old_tso_packets;
+	}
 }
 
 static void efx_get_base_stats(struct net_device *net_dev,
@@ -676,6 +683,8 @@ static void efx_get_base_stats(struct net_device *net_dev,
 	rx->hw_drops = 0;
 	rx->hw_drop_overruns = 0;
 	tx->packets = 0;
+	tx->hw_gso_packets = 0;
+	tx->hw_gso_wire_packets = 0;
 
 	/* Count all packets on non-core queues, and packets before last
 	 * datapath start on core queues.
@@ -694,10 +703,15 @@ static void efx_get_base_stats(struct net_device *net_dev,
 		efx_for_each_channel_tx_queue(tx_queue, channel) {
 			if (channel->channel < efx->tx_channel_offset ||
 			    channel->channel >= efx->tx_channel_offset +
-						net_dev->real_num_tx_queues)
+						net_dev->real_num_tx_queues) {
 				tx->packets += tx_queue->tx_packets;
-			else
+				tx->hw_gso_packets += tx_queue->tso_bursts;
+				tx->hw_gso_wire_packets += tx_queue->tso_packets;
+			} else {
 				tx->packets += tx_queue->old_tx_packets;
+				tx->hw_gso_packets += tx_queue->old_tso_bursts;
+				tx->hw_gso_wire_packets += tx_queue->old_tso_packets;
+			}
 		}
 	}
 }
diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index 25701f37aa40..2cf2935a713c 100644
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -234,6 +234,8 @@ struct efx_tx_buffer {
  * @notify_count: Count of notified descriptors to the NIC
  * @tx_packets: Number of packets sent since this struct was created
  * @old_tx_packets: Value of @tx_packets as of last efx_init_tx_queue()
+ * @old_tso_bursts: Value of @tso_bursts as of last efx_init_tx_queue()
+ * @old_tso_packets: Value of @tso_packets as of last efx_init_tx_queue()
  * @empty_read_count: If the completion path has seen the queue as empty
  *	and the transmission path has not yet checked this, the value of
  *	@read_count bitwise-added to %EFX_EMPTY_COUNT_VALID; otherwise 0.
@@ -284,6 +286,8 @@ struct efx_tx_queue {
 	/* Statistics to supplement MAC stats */
 	unsigned long tx_packets;
 	unsigned long old_tx_packets;
+	unsigned int old_tso_bursts;
+	unsigned int old_tso_packets;
 
 	/* Members shared between paths and sometimes updated */
 	unsigned int empty_read_count ____cacheline_aligned_in_smp;
diff --git a/drivers/net/ethernet/sfc/tx_common.c b/drivers/net/ethernet/sfc/tx_common.c
index f1694900e0f0..cd0857131aa8 100644
--- a/drivers/net/ethernet/sfc/tx_common.c
+++ b/drivers/net/ethernet/sfc/tx_common.c
@@ -87,6 +87,8 @@ void efx_init_tx_queue(struct efx_tx_queue *tx_queue)
 	tx_queue->completed_timestamp_minor = 0;
 
 	tx_queue->old_tx_packets = tx_queue->tx_packets;
+	tx_queue->old_tso_bursts = tx_queue->tso_bursts;
+	tx_queue->old_tso_packets = tx_queue->tso_packets;
 
 	tx_queue->xdp_tx = efx_channel_is_xdp_tx(tx_queue->channel);
 	tx_queue->tso_version = 0;