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From: Parav Pandit <parav@nvidia.com>
To: <mst@redhat.com>, <jasowang@redhat.com>, <davem@davemloft.net>,
	<kuba@kernel.org>, <netdev@vger.kernel.org>
Cc: <edumazet@google.com>, <pabeni@redhat.com>, <ast@kernel.org>,
	<daniel@iogearbox.net>, <hawk@kernel.org>,
	<john.fastabend@gmail.com>,
	<virtualization@lists.linux-foundation.org>,
	<bpf@vger.kernel.org>, "Parav Pandit" <parav@nvidia.com>,
	Jiri Pirko <jiri@nvidia.com>
Subject: [PATCH net] virtio-net: Keep stop() to follow mirror sequence of open()
Date: Thu, 2 Feb 2023 18:35:16 +0200	[thread overview]
Message-ID: <20230202163516.12559-1-parav@nvidia.com> (raw)

Cited commit in fixes tag frees rxq xdp info while RQ NAPI is
still enabled and packet processing may be ongoing.

Follow the mirror sequence of open() in the stop() callback.
This ensures that when rxq info is unregistered, no rx
packet processing is ongoing.

Fixes: 754b8a21a96d ("virtio_net: setup xdp_rxq_info")
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Parav Pandit <parav@nvidia.com>
---
 drivers/net/virtio_net.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 7e1a98430190..b7d0b54c3bb0 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2279,8 +2279,8 @@ static int virtnet_close(struct net_device *dev)
 	cancel_delayed_work_sync(&vi->refill);
 
 	for (i = 0; i < vi->max_queue_pairs; i++) {
-		xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
 		napi_disable(&vi->rq[i].napi);
+		xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
 		virtnet_napi_tx_disable(&vi->sq[i].napi);
 	}
 
-- 
2.26.2


WARNING: multiple messages have this Message-ID (diff)
From: Parav Pandit via Virtualization <virtualization@lists.linux-foundation.org>
To: <mst@redhat.com>, <jasowang@redhat.com>, <davem@davemloft.net>,
	<kuba@kernel.org>, <netdev@vger.kernel.org>
Cc: hawk@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com,
	ast@kernel.org, virtualization@lists.linux-foundation.org,
	edumazet@google.com, Jiri Pirko <jiri@nvidia.com>,
	bpf@vger.kernel.org, pabeni@redhat.com
Subject: [PATCH net] virtio-net: Keep stop() to follow mirror sequence of open()
Date: Thu, 2 Feb 2023 18:35:16 +0200	[thread overview]
Message-ID: <20230202163516.12559-1-parav@nvidia.com> (raw)

Cited commit in fixes tag frees rxq xdp info while RQ NAPI is
still enabled and packet processing may be ongoing.

Follow the mirror sequence of open() in the stop() callback.
This ensures that when rxq info is unregistered, no rx
packet processing is ongoing.

Fixes: 754b8a21a96d ("virtio_net: setup xdp_rxq_info")
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Parav Pandit <parav@nvidia.com>
---
 drivers/net/virtio_net.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 7e1a98430190..b7d0b54c3bb0 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2279,8 +2279,8 @@ static int virtnet_close(struct net_device *dev)
 	cancel_delayed_work_sync(&vi->refill);
 
 	for (i = 0; i < vi->max_queue_pairs; i++) {
-		xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
 		napi_disable(&vi->rq[i].napi);
+		xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
 		virtnet_napi_tx_disable(&vi->sq[i].napi);
 	}
 
-- 
2.26.2

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Virtualization@lists.linux-foundation.org
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             reply	other threads:[~2023-02-02 16:35 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-02 16:35 Parav Pandit [this message]
2023-02-02 16:35 ` [PATCH net] virtio-net: Keep stop() to follow mirror sequence of open() Parav Pandit via Virtualization
2023-02-02 18:40 ` patchwork-bot+netdevbpf

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