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authorWanlong Gao <gaowanlong@cn.fujitsu.com>2013-01-24 23:51:29 +0000
committerDavid S. Miller <davem@davemloft.net>2013-01-27 01:22:51 -0500
commit47be24796c13e7d9f087005c2bedc68ee0709f7b (patch)
treed1f4e4c652876e1121f97cb8f5ccf4e1ef1946bf /drivers
parentee50e135aeb048b90fab662e661c58b67341830b (diff)
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virtio-net: fix the set affinity bug when CPU IDs are not consecutive
As Michael mentioned, set affinity and select queue will not work very well when CPU IDs are not consecutive, this can happen with hot unplug. Fix this bug by traversal the online CPUs, and create a per cpu variable to find the mapping from CPU to the preferable virtual-queue. 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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/virtio_net.c67
1 files changed, 54 insertions, 13 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index a6fcf15adc4..fda214a5426 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -123,6 +123,9 @@ struct virtnet_info {
/* Does the affinity hint is set for virtqueues? */
bool affinity_hint_set;
+
+ /* Per-cpu variable to show the mapping from CPU to virtqueue */
+ int __percpu *vq_index;
};
struct skb_vnet_hdr {
@@ -1016,6 +1019,7 @@ static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
static void virtnet_set_affinity(struct virtnet_info *vi, bool set)
{
int i;
+ int cpu;
/* In multiqueue mode, when the number of cpu is equal to the number of
* queue pairs, we let the queue pairs to be private to one cpu by
@@ -1023,22 +1027,40 @@ static void virtnet_set_affinity(struct virtnet_info *vi, bool set)
*/
if ((vi->curr_queue_pairs == 1 ||
vi->max_queue_pairs != num_online_cpus()) && set) {
- if (vi->affinity_hint_set)
+ if (vi->affinity_hint_set) {
set = false;
- else
+ } else {
+ i = 0;
+ for_each_online_cpu(cpu)
+ *per_cpu_ptr(vi->vq_index, cpu) =
+ ++i % vi->curr_queue_pairs;
return;
+ }
}
- for (i = 0; i < vi->max_queue_pairs; i++) {
- int cpu = set ? i : -1;
- virtqueue_set_affinity(vi->rq[i].vq, cpu);
- virtqueue_set_affinity(vi->sq[i].vq, cpu);
- }
+ 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++;
+ }
- if (set)
vi->affinity_hint_set = true;
- else
+ } 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;
+ }
}
static void virtnet_get_ringparam(struct net_device *dev,
@@ -1082,6 +1104,7 @@ static int virtnet_set_channels(struct net_device *dev,
if (queue_pairs > vi->max_queue_pairs)
return -EINVAL;
+ get_online_cpus();
err = virtnet_set_queues(vi, queue_pairs);
if (!err) {
netif_set_real_num_tx_queues(dev, queue_pairs);
@@ -1089,6 +1112,7 @@ static int virtnet_set_channels(struct net_device *dev,
virtnet_set_affinity(vi, true);
}
+ put_online_cpus();
return err;
}
@@ -1127,12 +1151,19 @@ static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
/* To avoid contending a lock hold by a vcpu who would exit to host, select the
* txq based on the processor id.
- * TODO: handle cpu hotplug.
*/
static u16 virtnet_select_queue(struct net_device *dev, struct sk_buff *skb)
{
- int txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) :
- smp_processor_id();
+ int txq;
+ struct virtnet_info *vi = netdev_priv(dev);
+
+ if (skb_rx_queue_recorded(skb)) {
+ txq = skb_get_rx_queue(skb);
+ } else {
+ txq = *__this_cpu_ptr(vi->vq_index);
+ if (txq == -1)
+ txq = 0;
+ }
while (unlikely(txq >= dev->real_num_tx_queues))
txq -= dev->real_num_tx_queues;
@@ -1371,7 +1402,10 @@ static int init_vqs(struct virtnet_info *vi)
if (ret)
goto err_free;
+ get_online_cpus();
virtnet_set_affinity(vi, true);
+ put_online_cpus();
+
return 0;
err_free:
@@ -1453,6 +1487,10 @@ static int virtnet_probe(struct virtio_device *vdev)
if (vi->stats == NULL)
goto free;
+ vi->vq_index = alloc_percpu(int);
+ if (vi->vq_index == NULL)
+ goto free_stats;
+
mutex_init(&vi->config_lock);
vi->config_enable = true;
INIT_WORK(&vi->config_work, virtnet_config_changed_work);
@@ -1476,7 +1514,7 @@ static int virtnet_probe(struct virtio_device *vdev)
/* Allocate/initialize the rx/tx queues, and invoke find_vqs */
err = init_vqs(vi);
if (err)
- goto free_stats;
+ goto free_index;
netif_set_real_num_tx_queues(dev, 1);
netif_set_real_num_rx_queues(dev, 1);
@@ -1520,6 +1558,8 @@ free_recv_bufs:
free_vqs:
cancel_delayed_work_sync(&vi->refill);
virtnet_del_vqs(vi);
+free_index:
+ free_percpu(vi->vq_index);
free_stats:
free_percpu(vi->stats);
free:
@@ -1554,6 +1594,7 @@ static void virtnet_remove(struct virtio_device *vdev)
flush_work(&vi->config_work);
+ free_percpu(vi->vq_index);
free_percpu(vi->stats);
free_netdev(vi->dev);
}