netdev - [PATCH vhost 20/22] virtio_net: xsk: rx: virtnet_rq_free_unused

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Message-Id: <20231011092728.105904-21-xuanzhuo@linux.alibaba.com>
Date: Wed, 11 Oct 2023 17:27:26 +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 20/22] virtio_net: xsk: rx: virtnet_rq_free_unused_buf() check xsk buffer

Since this will be called in other circumstances(freeze), we must check
whether it is xsk's buffer in this function. It cannot be judged outside
this function.

Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 drivers/net/virtio/main.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c
index 61be5a353ff3..60b5bd21fcc6 100644
--- a/drivers/net/virtio/main.c
+++ b/drivers/net/virtio/main.c
@@ -3910,8 +3910,21 @@ void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf)
 void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf)
 {
 	struct virtnet_info *vi = vq->vdev->priv;
+	struct xsk_buff_pool *pool;
 	int i = vq2rxq(vq);
 
+	rcu_read_lock();
+	pool = rcu_dereference(vi->rq[i].xsk.pool);
+	if (pool) {
+		struct xdp_buff *xdp;
+
+		xdp = (struct xdp_buff *)buf;
+		xsk_buff_free(xdp);
+		rcu_read_unlock();
+		return;
+	}
+	rcu_read_unlock();
+
 	if (vi->mergeable_rx_bufs)
 		put_page(virt_to_head_page(buf));
 	else if (vi->big_packets)
-- 
2.32.0.3.g01195cf9f