netdev - [RFC PATCH v3 net-next 6/7] sfc: implement per-queue TSO (hw

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Message-ID: <7f2ec1130f96c77785424565d8068e172f88eaa6.1726593633.git.ecree.xilinx@gmail.com>
Date: Wed, 18 Sep 2024 17:14:28 +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>,
	<habetsm.xilinx@...il.com>, <jacob.e.keller@...el.com>
Subject: [RFC PATCH v3 net-next 6/7] sfc: implement per-queue TSO (hw_gso) stats

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

Use our existing TSO stats, which count enqueued TSO TXes.
Users may expect them to count completions, as tx-packets and
 tx-bytes do; however, these are the counters we have, and the
 qstats documentation doesn't actually specify.

Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>
Signed-off-by: Edward Cree <ecree.xilinx@...il.com>
---
 drivers/net/ethernet/sfc/efx.c        | 16 ++++++++++++++++
 drivers/net/ethernet/sfc/net_driver.h |  4 ++++
 drivers/net/ethernet/sfc/tx_common.c  |  2 ++
 3 files changed, 22 insertions(+)

diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c
index b0ea4ca82cd8..68ddb28d3141 100644
--- a/drivers/net/ethernet/sfc/efx.c
+++ b/drivers/net/ethernet/sfc/efx.c
@@ -654,11 +654,21 @@ 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->bytes = 0;
+	stats->hw_gso_packets = 0;
+	stats->hw_gso_wire_packets = 0;
 	efx_for_each_channel_tx_queue(tx_queue, channel) {
 		stats->packets += tx_queue->complete_packets -
 				  tx_queue->old_complete_packets;
 		stats->bytes += tx_queue->complete_bytes -
 				tx_queue->old_complete_bytes;
+		/* Note that, unlike stats->packets and stats->bytes,
+		 * these count TXes enqueued, rather than completed,
+		 * which may not be what users expect.
+		 */
+		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;
 	}
 }
 
@@ -676,6 +686,8 @@ static void efx_get_base_stats(struct net_device *net_dev,
 	rx->hw_drop_overruns = 0;
 	tx->packets = 0;
 	tx->bytes = 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.
@@ -697,9 +709,13 @@ static void efx_get_base_stats(struct net_device *net_dev,
 						net_dev->real_num_tx_queues) {
 				tx->packets += tx_queue->complete_packets;
 				tx->bytes += tx_queue->complete_bytes;
+				tx->hw_gso_packets += tx_queue->tso_bursts;
+				tx->hw_gso_wire_packets += tx_queue->tso_packets;
 			} else {
 				tx->packets += tx_queue->old_complete_packets;
 				tx->bytes += tx_queue->old_complete_bytes;
+				tx->hw_gso_packets += tx_queue->old_tso_bursts;
+				tx->hw_gso_wire_packets += tx_queue->old_tso_packets;
 			}
 			/* Include XDP TX in device-wide stats */
 			tx->packets += tx_queue->complete_xdp_packets;
diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index f6632f8185b2..4ca48db3e168 100644
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -197,6 +197,8 @@ struct efx_tx_buffer {
  *	efx_init_tx_queue()
  * @old_complete_bytes: Value of @complete_bytes 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()
  * @read_count: Current read pointer.
  *	This is the number of buffers that have been removed from both rings.
  * @old_write_count: The value of @write_count when last checked.
@@ -276,6 +278,8 @@ struct efx_tx_queue {
 	bool xdp_tx;
 	unsigned long old_complete_packets;
 	unsigned long old_complete_bytes;
+	unsigned int old_tso_bursts;
+	unsigned int old_tso_packets;
 
 	/* Members used mainly on the completion path */
 	unsigned int 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 2013a609f9be..a22a0d634ffc 100644
--- a/drivers/net/ethernet/sfc/tx_common.c
+++ b/drivers/net/ethernet/sfc/tx_common.c
@@ -88,6 +88,8 @@ void efx_init_tx_queue(struct efx_tx_queue *tx_queue)
 
 	tx_queue->old_complete_packets = tx_queue->complete_packets;
 	tx_queue->old_complete_bytes = tx_queue->complete_bytes;
+	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;