netdev - [RFC net-next 11/13] virtio_net: xsk: tx: handle the transmitted xsk buffer

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Message-Id: <20240716064628.1950-12-xuanzhuo@linux.alibaba.com>
Date: Tue, 16 Jul 2024 14:46:26 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: netdev@...r.kernel.org
Cc: "Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	virtualization@...ts.linux.dev,
	bpf@...r.kernel.org
Subject: [RFC net-next 11/13] virtio_net: xsk: tx: handle the transmitted xsk buffer

virtnet_free_old_xmit distinguishes three type ptr(skb, xdp frame, xsk
buffer) by the last bits of the pointer.

Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 drivers/net/virtio_net.c | 85 ++++++++++++++++++++++++++++------------
 1 file changed, 59 insertions(+), 26 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index ce8ac9239158..700d080d8c5b 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -85,6 +85,7 @@ struct virtnet_sq_free_stats {
 	u64 bytes;
 	u64 napi_packets;
 	u64 napi_bytes;
+	u64 xsk;
 };
 
 struct virtnet_sq_stats {
@@ -511,6 +512,7 @@ static struct sk_buff *virtnet_skb_append_frag(struct sk_buff *head_skb,
 					       struct sk_buff *curr_skb,
 					       struct page *page, void *buf,
 					       int len, int truesize);
+static void virtnet_xsk_completed(struct send_queue *sq, int num);
 
 enum virtnet_xmit_type {
 	VIRTNET_XMIT_TYPE_SKB,
@@ -595,12 +597,24 @@ static void __free_old_xmit(struct send_queue *sq, struct netdev_queue *txq,
 
 		case VIRTNET_XMIT_TYPE_XSK:
 			stats->bytes += virtnet_ptr_to_xsk(ptr);
+			stats->xsk++;
 			break;
 		}
 	}
 	netdev_tx_completed_queue(txq, stats->napi_packets, stats->napi_bytes);
 }
 
+static void virtnet_free_old_xmit(struct send_queue *sq,
+				  struct netdev_queue *txq,
+				  bool in_napi,
+				  struct virtnet_sq_free_stats *stats)
+{
+	__free_old_xmit(sq, txq, in_napi, stats);
+
+	if (stats->xsk)
+		virtnet_xsk_completed(sq, stats->xsk);
+}
+
 /* Converting between virtqueue no. and kernel tx/rx queue no.
  * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
  */
@@ -1021,7 +1035,7 @@ static void free_old_xmit(struct send_queue *sq, struct netdev_queue *txq,
 {
 	struct virtnet_sq_free_stats stats = {0};
 
-	__free_old_xmit(sq, txq, in_napi, &stats);
+	virtnet_free_old_xmit(sq, txq, in_napi, &stats);
 
 	/* Avoid overhead when no packets have been processed
 	 * happens when called speculatively from start_xmit.
@@ -1382,29 +1396,6 @@ static int virtnet_add_recvbuf_xsk(struct virtnet_info *vi, struct receive_queue
 	return err;
 }
 
-static int virtnet_xsk_wakeup(struct net_device *dev, u32 qid, u32 flag)
-{
-	struct virtnet_info *vi = netdev_priv(dev);
-	struct send_queue *sq;
-
-	if (!netif_running(dev))
-		return -ENETDOWN;
-
-	if (qid >= vi->curr_queue_pairs)
-		return -EINVAL;
-
-	sq = &vi->sq[qid];
-
-	if (napi_if_scheduled_mark_missed(&sq->napi))
-		return 0;
-
-	local_bh_disable();
-	virtqueue_napi_schedule(&sq->napi, sq->vq);
-	local_bh_enable();
-
-	return 0;
-}
-
 static void *virtnet_xsk_to_ptr(u32 len)
 {
 	unsigned long p;
@@ -1476,8 +1467,12 @@ static bool virtnet_xsk_xmit(struct send_queue *sq, struct xsk_buff_pool *pool,
 	u64 kicks = 0;
 	int sent;
 
+	/* Avoid to wakeup napi meanless, so call __free_old_xmit. */
 	__free_old_xmit(sq, netdev_get_tx_queue(dev, sq - vi->sq), true, &stats);
 
+	if (stats.xsk)
+		xsk_tx_completed(sq->xsk_pool, stats.xsk);
+
 	sent = virtnet_xsk_xmit_batch(sq, pool, budget, &kicks);
 
 	if (!is_xdp_raw_buffer_queue(vi, sq - vi->sq))
@@ -1496,6 +1491,44 @@ static bool virtnet_xsk_xmit(struct send_queue *sq, struct xsk_buff_pool *pool,
 	return sent == budget;
 }
 
+static void xsk_wakeup(struct send_queue *sq)
+{
+	if (napi_if_scheduled_mark_missed(&sq->napi))
+		return;
+
+	local_bh_disable();
+	virtqueue_napi_schedule(&sq->napi, sq->vq);
+	local_bh_enable();
+}
+
+static int virtnet_xsk_wakeup(struct net_device *dev, u32 qid, u32 flag)
+{
+	struct virtnet_info *vi = netdev_priv(dev);
+	struct send_queue *sq;
+
+	if (!netif_running(dev))
+		return -ENETDOWN;
+
+	if (qid >= vi->curr_queue_pairs)
+		return -EINVAL;
+
+	sq = &vi->sq[qid];
+
+	xsk_wakeup(sq);
+	return 0;
+}
+
+static void virtnet_xsk_completed(struct send_queue *sq, int num)
+{
+	xsk_tx_completed(sq->xsk_pool, num);
+
+	/* If this is called by rx poll, start_xmit and xdp xmit we should
+	 * wakeup the tx napi to consume the xsk tx queue, because the tx
+	 * interrupt may not be triggered.
+	 */
+	xsk_wakeup(sq);
+}
+
 static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
 				   struct send_queue *sq,
 				   struct xdp_frame *xdpf)
@@ -1609,8 +1642,8 @@ static int virtnet_xdp_xmit(struct net_device *dev,
 	}
 
 	/* Free up any pending old buffers before queueing new ones. */
-	__free_old_xmit(sq, netdev_get_tx_queue(dev, sq - vi->sq),
-			false, &stats);
+	virtnet_free_old_xmit(sq, netdev_get_tx_queue(dev, sq - vi->sq),
+			      false, &stats);
 
 	for (i = 0; i < n; i++) {
 		struct xdp_frame *xdpf = frames[i];
-- 
2.32.0.3.g01195cf9f