netdev - [PATCH vhost 16/22] virtio_net: xsk: tx: virtnet_free_old

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Message-Id: <20231011092728.105904-17-xuanzhuo@linux.alibaba.com>
Date: Wed, 11 Oct 2023 17:27:22 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: virtualization@...ts.linux-foundation.org
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	netdev@...r.kernel.org,
	bpf@...r.kernel.org
Subject: [PATCH vhost 16/22] virtio_net: xsk: tx: virtnet_free_old_xmit() distinguishes xsk buffer

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

Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 drivers/net/virtio/virtio_net.h | 16 ++++++++++++++--
 drivers/net/virtio/xsk.h        |  5 +++++
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/net/virtio/virtio_net.h b/drivers/net/virtio/virtio_net.h
index 3e114360cc8a..54f954ea62fb 100644
--- a/drivers/net/virtio/virtio_net.h
+++ b/drivers/net/virtio/virtio_net.h
@@ -243,6 +243,11 @@ struct virtnet_info {
 
 #include "xsk.h"
 
+static inline bool virtnet_is_skb_ptr(void *ptr)
+{
+	return !((unsigned long)ptr & VIRTIO_XMIT_DATA_MASK);
+}
+
 static inline bool virtnet_is_xdp_frame(void *ptr)
 {
 	return (unsigned long)ptr & VIRTIO_XDP_FLAG;
@@ -278,11 +283,12 @@ static inline void *virtnet_sq_unmap(struct virtnet_sq *sq, void *data)
 static inline void virtnet_free_old_xmit(struct virtnet_sq *sq, bool in_napi,
 					 struct virtnet_sq_stats *stats)
 {
+	unsigned int xsknum = 0;
 	unsigned int len;
 	void *ptr;
 
 	while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
-		if (!virtnet_is_xdp_frame(ptr)) {
+		if (virtnet_is_skb_ptr(ptr)) {
 			struct sk_buff *skb;
 
 			if (sq->do_dma)
@@ -294,7 +300,7 @@ static inline void virtnet_free_old_xmit(struct virtnet_sq *sq, bool in_napi,
 
 			stats->bytes += skb->len;
 			napi_consume_skb(skb, in_napi);
-		} else {
+		} else if (virtnet_is_xdp_frame(ptr)) {
 			struct xdp_frame *frame;
 
 			if (sq->do_dma)
@@ -304,9 +310,15 @@ static inline void virtnet_free_old_xmit(struct virtnet_sq *sq, bool in_napi,
 
 			stats->bytes += xdp_get_frame_len(frame);
 			xdp_return_frame(frame);
+		} else {
+			stats->bytes += virtnet_ptr_to_xsk(ptr);
+			++xsknum;
 		}
 		stats->packets++;
 	}
+
+	if (xsknum)
+		xsk_tx_completed(sq->xsk.pool, xsknum);
 }
 
 static inline void virtnet_vq_napi_schedule(struct napi_struct *napi,
diff --git a/drivers/net/virtio/xsk.h b/drivers/net/virtio/xsk.h
index 1bd19dcda649..7ebc9bda7aee 100644
--- a/drivers/net/virtio/xsk.h
+++ b/drivers/net/virtio/xsk.h
@@ -14,6 +14,11 @@ static inline void *virtnet_xsk_to_ptr(u32 len)
 	return (void *)(p | VIRTIO_XSK_FLAG);
 }
 
+static inline u32 virtnet_ptr_to_xsk(void *ptr)
+{
+	return ((unsigned long)ptr) >> VIRTIO_XSK_FLAG_OFFSET;
+}
+
 int virtnet_xsk_pool_setup(struct net_device *dev, struct netdev_bpf *xdp);
 bool virtnet_xsk_xmit(struct virtnet_sq *sq, struct xsk_buff_pool *pool,
 		      int budget);
-- 
2.32.0.3.g01195cf9f