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Tsirkin" , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , virtualization@lists.linux.dev (open list:VIRTIO CORE AND NET DRIVERS), linux-kernel@vger.kernel.org (open list) Subject: [RFC net-next v3 3/4] virtio_net: Map NAPIs to queues Date: Tue, 21 Jan 2025 19:10:43 +0000 Message-Id: <20250121191047.269844-4-jdamato@fastly.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250121191047.269844-1-jdamato@fastly.com> References: <20250121191047.269844-1-jdamato@fastly.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Use netif_queue_set_napi to map NAPIs to queue IDs so that the mapping can be accessed by user apps. $ ethtool -i ens4 | grep driver driver: virtio_net $ sudo ethtool -L ens4 combined 4 $ ./tools/net/ynl/pyynl/cli.py \ --spec Documentation/netlink/specs/netdev.yaml \ --dump queue-get --json=3D'{"ifindex": 2}' [{'id': 0, 'ifindex': 2, 'napi-id': 8289, 'type': 'rx'}, {'id': 1, 'ifindex': 2, 'napi-id': 8290, 'type': 'rx'}, {'id': 2, 'ifindex': 2, 'napi-id': 8291, 'type': 'rx'}, {'id': 3, 'ifindex': 2, 'napi-id': 8292, 'type': 'rx'}, {'id': 0, 'ifindex': 2, 'type': 'tx'}, {'id': 1, 'ifindex': 2, 'type': 'tx'}, {'id': 2, 'ifindex': 2, 'type': 'tx'}, {'id': 3, 'ifindex': 2, 'type': 'tx'}] Note that virtio_net has TX-only NAPIs which do not have NAPI IDs, so the lack of 'napi-id' in the above output is expected. Signed-off-by: Joe Damato Acked-by: Jason Wang Reviewed-by: Gerhard Engleder --- rfcv3: - Eliminated XDP checks; NAPIs will always be mapped to RX queues, as Gerhard Engleder suggested. v2: - Eliminate RTNL code paths using the API Jakub introduced in patch 1 of this v2. - Added virtnet_napi_disable to reduce code duplication as suggested by Jason Wang. drivers/net/virtio_net.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index cff18c66b54a..c120cb2106c0 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -2805,7 +2805,11 @@ static void virtnet_napi_do_enable(struct virtqueue = *vq, =20 static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *= napi) { + struct virtnet_info *vi =3D vq->vdev->priv; + virtnet_napi_do_enable(vq, napi); + + netif_queue_set_napi(vi->dev, vq2rxq(vq), NETDEV_QUEUE_TYPE_RX, napi); } =20 static void virtnet_napi_tx_enable(struct virtnet_info *vi, @@ -2826,6 +2830,16 @@ static void virtnet_napi_tx_enable(struct virtnet_in= fo *vi, virtnet_napi_do_enable(vq, napi); } =20 +static void virtnet_napi_disable(struct virtqueue *vq, + struct napi_struct *napi) +{ + struct virtnet_info *vi =3D vq->vdev->priv; + + netif_queue_set_napi(vi->dev, vq2rxq(vq), NETDEV_QUEUE_TYPE_RX, NULL); + + napi_disable(napi); +} + static void virtnet_napi_tx_disable(struct napi_struct *napi) { if (napi->weight) @@ -2842,7 +2856,8 @@ static void refill_work(struct work_struct *work) for (i =3D 0; i < vi->curr_queue_pairs; i++) { struct receive_queue *rq =3D &vi->rq[i]; =20 - napi_disable(&rq->napi); + virtnet_napi_disable(rq->vq, &rq->napi); + still_empty =3D !try_fill_recv(vi, rq, GFP_KERNEL); virtnet_napi_enable(rq->vq, &rq->napi); =20 @@ -3042,7 +3057,7 @@ static int virtnet_poll(struct napi_struct *napi, int= budget) static void virtnet_disable_queue_pair(struct virtnet_info *vi, int qp_ind= ex) { virtnet_napi_tx_disable(&vi->sq[qp_index].napi); - napi_disable(&vi->rq[qp_index].napi); + virtnet_napi_disable(vi->rq[qp_index].vq, &vi->rq[qp_index].napi); xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq); } =20 @@ -3313,7 +3328,7 @@ static void virtnet_rx_pause(struct virtnet_info *vi,= struct receive_queue *rq) bool running =3D netif_running(vi->dev); =20 if (running) { - napi_disable(&rq->napi); + virtnet_napi_disable(rq->vq, &rq->napi); virtnet_cancel_dim(vi, &rq->dim); } } @@ -5932,7 +5947,7 @@ static int virtnet_xdp_set(struct net_device *dev, st= ruct bpf_prog *prog, /* Make sure NAPI is not using any XDP TX queues for RX. */ if (netif_running(dev)) { for (i =3D 0; i < vi->max_queue_pairs; i++) { - napi_disable(&vi->rq[i].napi); + virtnet_napi_disable(vi->rq[i].vq, &vi->rq[i].napi); virtnet_napi_tx_disable(&vi->sq[i].napi); } } --=20 2.25.1