From: Jason Wang <jasow...@redhat.com> Date: Mon, 30 Sep 2013 15:37:17 +0800
> We used to use a percpu structure vq_index to record the cpu to queue > mapping, this is suboptimal since it duplicates the work of XPS and > loses all other XPS functionality such as allowing use to configure > their own transmission steering strategy. > > So this patch switches to use XPS and suggest a default mapping when > the number of cpus is equal to the number of queues. With XPS support, > there's no need for keeping per-cpu vq_index and .ndo_select_queue(), > so they were removed also. > > Cc: Rusty Russell <ru...@rustcorp.com.au> > Cc: Michael S. Tsirkin <m...@redhat.com> > Signed-off-by: Jason Wang <jasow...@redhat.com> > --- > Changes from V1: > - use cpumask_of() instead of allocate dynamically This generates build warnings: drivers/net/virtio_net.c: In function ‘virtnet_set_affinity’: drivers/net/virtio_net.c:1093:3: warning: passing argument 2 of ‘netif_set_xps_queue’ discards ‘const’ qualifier from pointer target type [enabled by default] In file included from drivers/net/virtio_net.c:20:0: include/linux/netdevice.h:2275:5: note: expected ‘struct cpumask *’ but argument is of type ‘const struct cpumask *’
