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hv_netvsc: defer queue selection to VF

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When VF is used for accelerated networking it will likely have
more queues (and different policy) than the synthetic NIC.
This patch defers the queue policy to the VF so that all the
queues can be used. This impacts workloads like local generate UDP.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2018-03-02 13:49:07 -08:00 committed by David S. Miller
parent 68633edaef
commit b3bf5666a5
1 changed files with 13 additions and 2 deletions
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15
drivers/net/hyperv/netvsc_drv.c
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@ -298,8 +298,19 @@ static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
rcu_read_lock();
vf_netdev = rcu_dereference(ndc->vf_netdev);
if (vf_netdev) {
txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
const struct net_device_ops *vf_ops = vf_netdev->netdev_ops;
if (vf_ops->ndo_select_queue)
txq = vf_ops->ndo_select_queue(vf_netdev, skb,
accel_priv, fallback);
else
txq = fallback(vf_netdev, skb);
/* Record the queue selected by VF so that it can be
* used for common case where VF has more queues than
* the synthetic device.
*/
qdisc_skb_cb(skb)->slave_dev_queue_mapping = txq;
} else {
txq = netvsc_pick_tx(ndev, skb);
}