[PATCH v14 40/42] virtio_net: support rx queue resize
From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Date: 2022-08-01 06:43:06
Also in:
bpf, kvm, linux-remoteproc, linux-s390, linux-um, platform-driver-x86, virtualization
Subsystem:
networking drivers, the rest, virtio net driver · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, "Michael S. Tsirkin", Jason Wang
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> Acked-by: Jason Wang <jasowang@redhat.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); + + 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
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2.31.0