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virtio-net: split out clean affinity function 

Split out the clean affinity function to virtnet_clean_affinity().

Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Eric Dumazet <erdnetdev@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: virtualization@lists.linux-foundation.org
Cc: netdev@vger.kernel.org
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wanlong Gao 2013-01-24 23:51:30 +00:00 committed by David S. Miller
parent 47be24796c
commit 8898c21cf3
1 changed files with 41 additions and 37 deletions
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78
drivers/net/virtio_net.c
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@ -1016,7 +1016,32 @@ static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
return 0;
}
static void virtnet_set_affinity(struct virtnet_info *vi, bool set)
static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu)
{
int i;
int cpu;
if (vi->affinity_hint_set) {
for (i = 0; i < vi->max_queue_pairs; i++) {
virtqueue_set_affinity(vi->rq[i].vq, -1);
virtqueue_set_affinity(vi->sq[i].vq, -1);
}
vi->affinity_hint_set = false;
}
i = 0;
for_each_online_cpu(cpu) {
if (cpu == hcpu) {
*per_cpu_ptr(vi->vq_index, cpu) = -1;
} else {
*per_cpu_ptr(vi->vq_index, cpu) =
++i % vi->curr_queue_pairs;
}
}
}
static void virtnet_set_affinity(struct virtnet_info *vi)
{
int i;
int cpu;
@ -1025,42 +1050,21 @@ static void virtnet_set_affinity(struct virtnet_info *vi, bool set)
* queue pairs, we let the queue pairs to be private to one cpu by
* setting the affinity hint to eliminate the contention.
*/
if ((vi->curr_queue_pairs == 1 ||
vi->max_queue_pairs != num_online_cpus()) && set) {
if (vi->affinity_hint_set) {
set = false;
} else {
i = 0;
for_each_online_cpu(cpu)
*per_cpu_ptr(vi->vq_index, cpu) =
++i % vi->curr_queue_pairs;
return;
}
if (vi->curr_queue_pairs == 1 ||
vi->max_queue_pairs != num_online_cpus()) {
virtnet_clean_affinity(vi, -1);
return;
}
if (set) {
i = 0;
for_each_online_cpu(cpu) {
virtqueue_set_affinity(vi->rq[i].vq, cpu);
virtqueue_set_affinity(vi->sq[i].vq, cpu);
*per_cpu_ptr(vi->vq_index, cpu) = i;
i++;
}
vi->affinity_hint_set = true;
} else {
for(i = 0; i < vi->max_queue_pairs; i++) {
virtqueue_set_affinity(vi->rq[i].vq, -1);
virtqueue_set_affinity(vi->sq[i].vq, -1);
}
i = 0;
for_each_online_cpu(cpu)
*per_cpu_ptr(vi->vq_index, cpu) =
++i % vi->curr_queue_pairs;
vi->affinity_hint_set = false;
i = 0;
for_each_online_cpu(cpu) {
virtqueue_set_affinity(vi->rq[i].vq, cpu);
virtqueue_set_affinity(vi->sq[i].vq, cpu);
*per_cpu_ptr(vi->vq_index, cpu) = i;
i++;
}
vi->affinity_hint_set = true;
}
static void virtnet_get_ringparam(struct net_device *dev,
@ -1110,7 +1114,7 @@ static int virtnet_set_channels(struct net_device *dev,
netif_set_real_num_tx_queues(dev, queue_pairs);
netif_set_real_num_rx_queues(dev, queue_pairs);
virtnet_set_affinity(vi, true);
virtnet_set_affinity(vi);
}
put_online_cpus();
@ -1279,7 +1283,7 @@ static void virtnet_del_vqs(struct virtnet_info *vi)
{
struct virtio_device *vdev = vi->vdev;
virtnet_set_affinity(vi, false);
virtnet_clean_affinity(vi, -1);
vdev->config->del_vqs(vdev);
@ -1403,7 +1407,7 @@ static int init_vqs(struct virtnet_info *vi)
goto err_free;
get_online_cpus();
virtnet_set_affinity(vi, true);
virtnet_set_affinity(vi);
put_online_cpus();
return 0;