Re: [PATCH v12 38/40] virtio_net: support rx queue resize
From: Jason Wang <jasowang@redhat.com>
Date: 2022-07-21 09:26:24
Also in:
bpf, kvm, linux-remoteproc, linux-s390, linux-um, platform-driver-x86, virtualization
在 2022/7/20 11:04, Xuan Zhuo 写道:
quoted hunk ↗ jump to hunk
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. Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> --- drivers/net/virtio_net.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index fe4dc43c05a1..1115a8b59a08 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c@@ -278,6 +278,8 @@ 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;@@ -1846,6 +1848,26 @@ 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) +{ + int err, qindex; + + qindex = rq - vi->rq; + + napi_disable(&rq->napi);
We need to disable refill work as well. So this series might need rebasing on top of https://lore.kernel.org/netdev/20220704074859.16912-1-jasowang@redhat.com/ (local) I will send a new version (probably tomorrow). Thanks
+ + 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); + + 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