On Mon, 4 Jul 2022 11:44:12 +0800, Jason Wang <jasowang at redhat.com>
wrote:>
> ? 2022/6/29 14:56, Xuan Zhuo ??:
> > 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 at 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 9fe222a3663a..6ab16fd193e5 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);
>
>
> Do we need to cancel the refill work here?
I think no, napi_disable is mutually exclusive, which ensures that there will be
no conflicts between them.
Thanks.
>
> 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
>