netdev - [PATCH 27/33] virtio_net: virtnet_rq_free_unused

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Date:   Thu,  2 Feb 2023 19:00:52 +0800
From:   Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To:     netdev@...r.kernel.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>,
        Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Menglong Dong <imagedong@...cent.com>,
        Kuniyuki Iwashima <kuniyu@...zon.com>,
        Petr Machata <petrm@...dia.com>,
        virtualization@...ts.linux-foundation.org, bpf@...r.kernel.org
Subject: [PATCH 27/33] virtio_net: 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 ced9a37f706b..43249c78484a 100644
--- a/drivers/net/virtio/main.c
+++ b/drivers/net/virtio/main.c
@@ -3296,8 +3296,21 @@ static 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