From 9bb8ca86075f37d3c169b9c46f8e7c6d3165e18f Mon Sep 17 00:00:00 2001 From: Jason Wang Date: Tue, 5 Nov 2013 18:19:45 +0800 Subject: [PATCH] virtio-net: switch to use XPS to choose txq 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 user 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 Cc: Michael S. Tsirkin Acked-by: Rusty Russell Acked-by: Michael S. Tsirkin Signed-off-by: Jason Wang Signed-off-by: David S. Miller --- drivers/net/virtio_net.c | 48 ++-------------------------------------- 1 file changed, 2 insertions(+), 46 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index a7e9ad9b213a..01f4eb5c8b78 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -132,9 +132,6 @@ 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; - /* CPU hot plug notifier */ struct notifier_block nb; }; @@ -1114,7 +1111,6 @@ static int virtnet_vlan_rx_kill_vid(struct net_device *dev, 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++) { @@ -1124,16 +1120,6 @@ static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) 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) @@ -1155,7 +1141,7 @@ static void virtnet_set_affinity(struct virtnet_info *vi) 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; + netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); i++; } @@ -1269,28 +1255,6 @@ static int virtnet_change_mtu(struct net_device *dev, int new_mtu) return 0; } -/* To avoid contending a lock hold by a vcpu who would exit to host, select the - * txq based on the processor id. - */ -static u16 virtnet_select_queue(struct net_device *dev, struct sk_buff *skb) -{ - 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; - - return txq; -} - static const struct net_device_ops virtnet_netdev = { .ndo_open = virtnet_open, .ndo_stop = virtnet_close, @@ -1302,7 +1266,6 @@ static const struct net_device_ops virtnet_netdev = { .ndo_get_stats64 = virtnet_stats, .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, - .ndo_select_queue = virtnet_select_queue, #ifdef CONFIG_NET_POLL_CONTROLLER .ndo_poll_controller = virtnet_netpoll, #endif @@ -1613,10 +1576,6 @@ 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); @@ -1643,7 +1602,7 @@ 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_index; + goto free_stats; netif_set_real_num_tx_queues(dev, 1); netif_set_real_num_rx_queues(dev, 1); @@ -1696,8 +1655,6 @@ free_vqs: virtnet_del_vqs(vi); if (vi->alloc_frag.page) put_page(vi->alloc_frag.page); -free_index: - free_percpu(vi->vq_index); free_stats: free_percpu(vi->stats); free: @@ -1736,7 +1693,6 @@ 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); } -- 2.20.1