Commit 133bbb18 authored Jan 17, 2019 by Willem de Bruijn Committed by David S. Miller Jan 19, 2019

virtio-net: per-queue RPS config



On multiqueue network devices, RPS maps are configured independently
for each receive queue through /sys/class/net/$DEV/queues/rx-*.

On virtio-net currently all packets use the map from rx-0, because the
real rx queue is not known at time of map lookup by get_rps_cpu.

Call skb_record_rx_queue in the driver rx path to make lookup work.

Recording the receive queue has ramifications beyond RPS, such as in
sticky load balancing decisions for sockets (skb_tx_hash) and XPS.

Reported-by: Mark Hlady <mhlady@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 5f2939d9

drivers/net/virtio_net.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -1035,6 +1035,7 @@ static void receive_buf(struct virtnet_info vi, struct receive_queue rq,
		goto frame_err;
		}

		skb_record_rx_queue(skb, vq2rxq(rq->vq));
		skb->protocol = eth_type_trans(skb, dev);
		pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
		ntohs(skb->protocol), skb->len, skb->pkt_type);

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