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([2001:ee0:4f0e:fb30:959f:bd4a:33b6:cab1]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b02a322117bsm1978174a12.64.2025.04.10.00.05.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 10 Apr 2025 00:06:04 -0700 (PDT) Message-ID: <4d3a1478-b6fc-47a3-8d77-7eca6a973a06@gmail.com> Date: Thu, 10 Apr 2025 14:05:57 +0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: [PATCH] virtio-net: hold netdev_lock when pausing rx From: Bui Quang Minh To: Jason Wang Cc: Xuan Zhuo , "Michael S . Tsirkin" , Andrew Lunn , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , =?UTF-8?Q?Eugenio_P=C3=A9rez?= , "David S . Miller" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, virtualization@lists.linux.dev References: <20250404093903.37416-1-minhquangbui99@gmail.com> <1743987836.9938157-1-xuanzhuo@linux.alibaba.com> <30419bd6-13b1-4426-9f93-b38b66ef7c3a@gmail.com> <4195db62-db43-4d61-88c3-7a7fbb164726@gmail.com> Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset="utf-8"; format="flowed" Content-Transfer-Encoding: quoted-printable When pausing rx (e.g. set up xdp, xsk pool, rx resize), we call napi_disable() on the receive queue's napi. In delayed refill_work, it also calls napi_disable() on the receive queue's napi. When napi_disable() is called on an already disabled napi, it will sleep in napi_disable_locked while still holding the netdev_lock. As a result, later napi_enable gets stuck too as it cannot acquire the netdev_lock. This leads to refill_work and the pause-then-resume tx are stuck altogether. This scenario can be reproducible by binding a XDP socket to virtio-net interface without setting up the fill ring. As a result, try_fill_recv will fail until the fill ring is set up and refill_work is scheduled. This commit makes the pausing rx path hold the netdev_lock until resuming, prevent any napi_disable() to be called on a temporarily disabled napi. Fixes: 413f0271f396 ("net: protect NAPI enablement with netdev_lock()") Signed-off-by: Bui Quang Minh --- =C2=A0drivers/net/virtio_net.c | 74 +++++++++++++++++++++++++-------------= -- =C2=A01 file changed, 47 insertions(+), 27 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 7e4617216a4b..74bd1065c586 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -2786,9 +2786,13 @@ static void skb_recv_done(struct virtqueue *rvq) =C2=A0} =C2=A0static void virtnet_napi_do_enable(struct virtqueue *vq, -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 struct napi_struct *napi) +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 struct napi_struct *napi, +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 bool netdev_locked) =C2=A0{ -=C2=A0=C2=A0=C2=A0 napi_enable(napi); +=C2=A0=C2=A0=C2=A0 if (netdev_locked) +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 napi_enable_locked(napi); +=C2=A0=C2=A0=C2=A0 else +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 napi_enable(napi); =C2=A0=C2=A0=C2=A0=C2=A0 /* If all buffers were filled by other side befor= e we napi_enabled, we =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * won't get another interrupt, so process a= ny outstanding packets=20 now. @@ -2799,16 +2803,16 @@ static void virtnet_napi_do_enable(struct=20 virtqueue *vq, =C2=A0=C2=A0=C2=A0=C2=A0 local_bh_enable(); =C2=A0} -static void virtnet_napi_enable(struct receive_queue *rq) +static void virtnet_napi_enable(struct receive_queue *rq, bool=20 netdev_locked) =C2=A0{ =C2=A0=C2=A0=C2=A0=C2=A0 struct virtnet_info *vi =3D rq->vq->vdev->priv; =C2=A0=C2=A0=C2=A0=C2=A0 int qidx =3D vq2rxq(rq->vq); -=C2=A0=C2=A0=C2=A0 virtnet_napi_do_enable(rq->vq, &rq->napi); +=C2=A0=C2=A0=C2=A0 virtnet_napi_do_enable(rq->vq, &rq->napi, netdev_locked= ); =C2=A0=C2=A0=C2=A0=C2=A0 netif_queue_set_napi(vi->dev, qidx, NETDEV_QUEUE_= TYPE_RX, &rq->napi); =C2=A0} -static void virtnet_napi_tx_enable(struct send_queue *sq) +static void virtnet_napi_tx_enable(struct send_queue *sq, bool=20 netdev_locked) =C2=A0{ =C2=A0=C2=A0=C2=A0=C2=A0 struct virtnet_info *vi =3D sq->vq->vdev->priv; =C2=A0=C2=A0=C2=A0=C2=A0 struct napi_struct *napi =3D &sq->napi; @@ -2825,11 +2829,11 @@ static void virtnet_napi_tx_enable(struct=20 send_queue *sq) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return; =C2=A0=C2=A0=C2=A0=C2=A0 } -=C2=A0=C2=A0=C2=A0 virtnet_napi_do_enable(sq->vq, napi); +=C2=A0=C2=A0=C2=A0 virtnet_napi_do_enable(sq->vq, napi, netdev_locked); =C2=A0=C2=A0=C2=A0=C2=A0 netif_queue_set_napi(vi->dev, qidx, NETDEV_QUEUE_= TYPE_TX, napi); =C2=A0} -static void virtnet_napi_tx_disable(struct send_queue *sq) +static void virtnet_napi_tx_disable(struct send_queue *sq, bool=20 netdev_locked) =C2=A0{ =C2=A0=C2=A0=C2=A0=C2=A0 struct virtnet_info *vi =3D sq->vq->vdev->priv; =C2=A0=C2=A0=C2=A0=C2=A0 struct napi_struct *napi =3D &sq->napi; @@ -2837,18 +2841,24 @@ static void virtnet_napi_tx_disable(struct=20 send_queue *sq) =C2=A0=C2=A0=C2=A0=C2=A0 if (napi->weight) { =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 netif_queue_set_napi(vi->= dev, qidx, NETDEV_QUEUE_TYPE_TX, NULL); -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 napi_disable(napi); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (netdev_locked) +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 napi_di= sable_locked(napi); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 else +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 napi_di= sable(napi); =C2=A0=C2=A0=C2=A0=C2=A0 } =C2=A0} -static void virtnet_napi_disable(struct receive_queue *rq) +static void virtnet_napi_disable(struct receive_queue *rq, bool=20 netdev_locked) =C2=A0{ =C2=A0=C2=A0=C2=A0=C2=A0 struct virtnet_info *vi =3D rq->vq->vdev->priv; =C2=A0=C2=A0=C2=A0=C2=A0 struct napi_struct *napi =3D &rq->napi; =C2=A0=C2=A0=C2=A0=C2=A0 int qidx =3D vq2rxq(rq->vq); =C2=A0=C2=A0=C2=A0=C2=A0 netif_queue_set_napi(vi->dev, qidx, NETDEV_QUEUE_= TYPE_RX, NULL); -=C2=A0=C2=A0=C2=A0 napi_disable(napi); +=C2=A0=C2=A0=C2=A0 if (netdev_locked) +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 napi_disable_locked(napi); +=C2=A0=C2=A0=C2=A0 else +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 napi_disable(napi); =C2=A0} =C2=A0static void refill_work(struct work_struct *work) @@ -2875,9 +2885,11 @@ static void refill_work(struct work_struct *work) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 *=C2=A0=C2=A0=C2=A0= =C2=A0 instance lock) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 *=C2=A0=C2=A0 - che= ck netif_running() and return early to avoid a race =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 */ -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 napi_disable(&rq->napi); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 netdev_lock(vi->dev); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 napi_disable_locked(&rq->napi); =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 still_empty =3D !try_fill= _recv(vi, rq, GFP_KERNEL); -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet_napi_do_enable(rq->vq, = &rq->napi); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet_napi_do_enable(rq->vq, = &rq->napi, true); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 netdev_unlock(vi->dev); =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* In theory, this can ha= ppen: if we don't get any buffers in =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * we will *never* t= ry to fill again. @@ -3074,8 +3086,8 @@ static int virtnet_poll(struct napi_struct *napi,=20 int budget) =C2=A0static void virtnet_disable_queue_pair(struct virtnet_info *vi, int=20 qp_index) =C2=A0{ -=C2=A0=C2=A0=C2=A0 virtnet_napi_tx_disable(&vi->sq[qp_index]); -=C2=A0=C2=A0=C2=A0 virtnet_napi_disable(&vi->rq[qp_index]); +=C2=A0=C2=A0=C2=A0 virtnet_napi_tx_disable(&vi->sq[qp_index], false); +=C2=A0=C2=A0=C2=A0 virtnet_napi_disable(&vi->rq[qp_index], false); =C2=A0=C2=A0=C2=A0=C2=A0 xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq); =C2=A0} @@ -3094,8 +3106,8 @@ static int virtnet_enable_queue_pair(struct=20 virtnet_info *vi, int qp_index) =C2=A0=C2=A0=C2=A0=C2=A0 if (err < 0) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 goto err_xdp_reg_mem_mode= l; -=C2=A0=C2=A0=C2=A0 virtnet_napi_enable(&vi->rq[qp_index]); -=C2=A0=C2=A0=C2=A0 virtnet_napi_tx_enable(&vi->sq[qp_index]); +=C2=A0=C2=A0=C2=A0 virtnet_napi_enable(&vi->rq[qp_index], false); +=C2=A0=C2=A0=C2=A0 virtnet_napi_tx_enable(&vi->sq[qp_index], false); =C2=A0=C2=A0=C2=A0=C2=A0 return 0; @@ -3347,7 +3359,8 @@ static void virtnet_rx_pause(struct virtnet_info=20 *vi, struct receive_queue *rq) =C2=A0=C2=A0=C2=A0=C2=A0 bool running =3D netif_running(vi->dev); =C2=A0=C2=A0=C2=A0=C2=A0 if (running) { -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet_napi_disable(rq); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 netdev_lock(vi->dev); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet_napi_disable(rq, true); =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet_cancel_dim(vi, &r= q->dim); =C2=A0=C2=A0=C2=A0=C2=A0 } =C2=A0} @@ -3359,8 +3372,10 @@ static void virtnet_rx_resume(struct virtnet_info=20 *vi, struct receive_queue *rq) =C2=A0=C2=A0=C2=A0=C2=A0 if (!try_fill_recv(vi, rq, GFP_KERNEL)) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 schedule_delayed_work(&vi= ->refill, 0); -=C2=A0=C2=A0=C2=A0 if (running) -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet_napi_enable(rq); +=C2=A0=C2=A0=C2=A0 if (running) { +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet_napi_enable(rq, true); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 netdev_unlock(vi->dev); +=C2=A0=C2=A0=C2=A0 } =C2=A0} =C2=A0static int virtnet_rx_resize(struct virtnet_info *vi, @@ -3389,7 +3404,7 @@ static void virtnet_tx_pause(struct virtnet_info=20 *vi, struct send_queue *sq) =C2=A0=C2=A0=C2=A0=C2=A0 qindex =3D sq - vi->sq; =C2=A0=C2=A0=C2=A0=C2=A0 if (running) -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet_napi_tx_disable(sq); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet_napi_tx_disable(sq, fal= se); =C2=A0=C2=A0=C2=A0=C2=A0 txq =3D netdev_get_tx_queue(vi->dev, qindex); @@ -3423,7 +3438,7 @@ static void virtnet_tx_resume(struct virtnet_info=20 *vi, struct send_queue *sq) =C2=A0=C2=A0=C2=A0=C2=A0 __netif_tx_unlock_bh(txq); =C2=A0=C2=A0=C2=A0=C2=A0 if (running) -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet_napi_tx_enable(sq); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet_napi_tx_enable(sq, fals= e); =C2=A0} =C2=A0static int virtnet_tx_resize(struct virtnet_info *vi, struct=20 send_queue *sq, @@ -5961,9 +5976,10 @@ static int virtnet_xdp_set(struct net_device=20 *dev, struct bpf_prog *prog, =C2=A0=C2=A0=C2=A0=C2=A0 /* Make sure NAPI is not using any XDP TX queues = for RX. */ =C2=A0=C2=A0=C2=A0=C2=A0 if (netif_running(dev)) { +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 netdev_lock(dev); =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 for (i =3D 0; i < vi->max= _queue_pairs; i++) { -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet= _napi_disable(&vi->rq[i]); -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet= _napi_tx_disable(&vi->sq[i]); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet= _napi_disable(&vi->rq[i], true); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet= _napi_tx_disable(&vi->sq[i], true); =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } =C2=A0=C2=A0=C2=A0=C2=A0 } @@ -6000,11 +6016,14 @@ static int virtnet_xdp_set(struct net_device=20 *dev, struct bpf_prog *prog, =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (old_prog) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 b= pf_prog_put(old_prog); =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (netif_running(dev)) { -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet= _napi_enable(&vi->rq[i]); -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet= _napi_tx_enable(&vi->sq[i]); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet= _napi_enable(&vi->rq[i], true); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet= _napi_tx_enable(&vi->sq[i], true); =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } =C2=A0=C2=A0=C2=A0=C2=A0 } +=C2=A0=C2=A0=C2=A0 if (netif_running(dev)) +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 netdev_unlock(dev); + =C2=A0=C2=A0=C2=A0=C2=A0 return 0; =C2=A0err: @@ -6016,9 +6035,10 @@ static int virtnet_xdp_set(struct net_device=20 *dev, struct bpf_prog *prog, =C2=A0=C2=A0=C2=A0=C2=A0 if (netif_running(dev)) { =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 for (i =3D 0; i < vi->max= _queue_pairs; i++) { -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet= _napi_enable(&vi->rq[i]); -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet= _napi_tx_enable(&vi->sq[i]); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet= _napi_enable(&vi->rq[i], true); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 virtnet= _napi_tx_enable(&vi->sq[i], true); =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 netdev_unlock(dev); =C2=A0=C2=A0=C2=A0=C2=A0 } =C2=A0=C2=A0=C2=A0=C2=A0 if (prog) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 bpf_prog_sub(prog, vi->ma= x_queue_pairs - 1); --=20 2.43.0