Jason Wang <jasowang@xxxxxxxxxx> writes:
> This addes multiqueue support to virtio_net driver. There's two mode supported:
> single queue pair mode and multiple queue pairs mode. An obvious
> difference compared with a physical mq card is that virtio-net reserve
> first two virtqueues when it is working in multiqueue mode, this is
> used for implementing adaptive mode switching in the future. The
> virtqueues that were in both mq and sq mode were initialized and only
> one queue pair (single queue mode) were used at default. User could
> use ethtool -L to switch to multiqueue mode withe the next patch.
Hi Jason,
This first patch looks good, but conflates three things
together:
(1) Separate per-queue structures from struct virtnet_info to allow
multiple queues. This is the mechanical part of the patch.
(2) An annotation bugfix, see below.
(3) Enabling mq using a new feature and negotiation.
> @@ -700,7 +767,8 @@ static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
> unsigned int start;
>
> for_each_possible_cpu(cpu) {
> - struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
> + struct virtnet_stats __percpu *stats
> + = per_cpu_ptr(vi->stats, cpu);
> u64 tpackets, tbytes, rpackets, rbytes;
>
> do {
Cheers,
Rusty.
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