From: Xuan Zhuo Date: Mon, 1 Aug 2022 06:39:00 +0000 (+0800) Subject: virtio_net: support rx queue resize X-Git-Tag: v6.6.17~6796^2~38 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6a4763e268030362340bc3286560d44be15a7421;p=platform%2Fkernel%2Flinux-rpi.git virtio_net: support rx queue resize This patch implements the resize function of the rx queues. Based on this function, it is possible to modify the ring num of the queue. Includes fixup: virtio_net: fix for stuck when change rx ring size with dev down When dev is set to DOWN state, napi has been disabled, if we modify the ring size at this time, we should not call napi_disable() again, which will cause stuck. And all operations are under the protection of rtnl_lock, so there is no need to consider concurrency issues. Message-Id: <20220801063902.129329-41-xuanzhuo@linux.alibaba.com> Acked-by: Jason Wang Message-Id: <20220811080258.79398-2-xuanzhuo@linux.alibaba.com> Reported-by: Kangjie Xu Signed-off-by: Xuan Zhuo Signed-off-by: Michael S. Tsirkin --- diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 8cad913..4cf278d 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -284,6 +284,8 @@ struct padded_vnet_hdr { char padding[12]; }; +static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf); + static bool is_xdp_frame(void *ptr) { return (unsigned long)ptr & VIRTIO_XDP_FLAG; @@ -1872,6 +1874,29 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) return NETDEV_TX_OK; } +static int virtnet_rx_resize(struct virtnet_info *vi, + struct receive_queue *rq, u32 ring_num) +{ + bool running = netif_running(vi->dev); + int err, qindex; + + qindex = rq - vi->rq; + + if (running) + napi_disable(&rq->napi); + + err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_free_unused_buf); + if (err) + netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err); + + if (!try_fill_recv(vi, rq, GFP_KERNEL)) + schedule_delayed_work(&vi->refill, 0); + + if (running) + virtnet_napi_enable(rq->vq, &rq->napi); + return err; +} + /* * Send command via the control virtqueue and check status. Commands * supported by the hypervisor, as indicated by feature bits, should