diff options
| -rw-r--r-- | drivers/net/virtio_net.c | 473 | ||||
| -rw-r--r-- | include/uapi/linux/virtio_net.h | 27 |
2 files changed, 402 insertions, 98 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 02a7102..c083048 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -58,6 +58,9 @@ struct send_queue { /* TX: fragments + linear part + virtio header */ struct scatterlist sg[MAX_SKB_FRAGS + 2]; + + /* Name of the send queue: output.$index */ + char name[40]; }; /* Internal representation of a receive virtqueue */ @@ -75,22 +78,34 @@ struct receive_queue { /* RX: fragments + linear part + virtio header */ struct scatterlist sg[MAX_SKB_FRAGS + 2]; + + /* Name of this receive queue: input.$index */ + char name[40]; }; struct virtnet_info { struct virtio_device *vdev; struct virtqueue *cvq; struct net_device *dev; - struct send_queue sq; - struct receive_queue rq; + struct send_queue *sq; + struct receive_queue *rq; unsigned int status; + /* Max # of queue pairs supported by the device */ + u16 max_queue_pairs; + + /* # of queue pairs currently used by the driver */ + u16 curr_queue_pairs; + /* I like... big packets and I cannot lie! */ bool big_packets; /* Host will merge rx buffers for big packets (shake it! shake it!) */ bool mergeable_rx_bufs; + /* Has control virtqueue */ + bool has_cvq; + /* enable config space updates */ bool config_enable; @@ -105,6 +120,9 @@ struct virtnet_info { /* Lock for config space updates */ struct mutex config_lock; + + /* Does the affinity hint is set for virtqueues? */ + bool affinity_hint_set; }; struct skb_vnet_hdr { @@ -125,6 +143,29 @@ struct padded_vnet_hdr { char padding[6]; }; +/* Converting between virtqueue no. and kernel tx/rx queue no. + * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq + */ +static int vq2txq(struct virtqueue *vq) +{ + return (virtqueue_get_queue_index(vq) - 1) / 2; +} + +static int txq2vq(int txq) +{ + return txq * 2 + 1; +} + +static int vq2rxq(struct virtqueue *vq) +{ + return virtqueue_get_queue_index(vq) / 2; +} + +static int rxq2vq(int rxq) +{ + return rxq * 2; +} + static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) { return (struct skb_vnet_hdr *)skb->cb; @@ -165,7 +206,7 @@ static void skb_xmit_done(struct virtqueue *vq) virtqueue_disable_cb(vq); /* We were probably waiting for more output buffers. */ - netif_wake_queue(vi->dev); + netif_wake_subqueue(vi->dev, vq2txq(vq)); } static void set_skb_frag(struct sk_buff *skb, struct page *page, @@ -502,7 +543,7 @@ static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp) static void skb_recv_done(struct virtqueue *rvq) { struct virtnet_info *vi = rvq->vdev->priv; - struct receive_queue *rq = &vi->rq; + struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; /* Schedule NAPI, Suppress further interrupts if successful. */ if (napi_schedule_prep(&rq->napi)) { @@ -532,15 +573,21 @@ static void refill_work(struct work_struct *work) struct virtnet_info *vi = container_of(work, struct virtnet_info, refill.work); bool still_empty; + int i; + + for (i = 0; i < vi->max_queue_pairs; i++) { + struct receive_queue *rq = &vi->rq[i]; - napi_disable(&vi->rq.napi); - still_empty = !try_fill_recv(&vi->rq, GFP_KERNEL); - virtnet_napi_enable(&vi->rq); + napi_disable(&rq->napi); + still_empty = !try_fill_recv(rq, GFP_KERNEL); + virtnet_napi_enable(rq); - /* In theory, this can happen: if we don't get any buffers in - * we will *never* try to fill again. */ - if (still_empty) - schedule_delayed_work(&vi->refill, HZ/2); + /* In theory, this can happen: if we don't get any buffers in + * we will *never* try to fill again. + */ + if (still_empty) + schedule_delayed_work(&vi->refill, HZ/2); + } } static int virtnet_poll(struct napi_struct *napi, int budget) @@ -578,6 +625,21 @@ again: return received; } +static int virtnet_open(struct net_device *dev) +{ + struct virtnet_info *vi = netdev_priv(dev); + int i; + + for (i = 0; i < vi->max_queue_pairs; i++) { + /* Make sure we have some buffers: if oom use wq. */ + if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) + schedule_delayed_work(&vi->refill, 0); + virtnet_napi_enable(&vi->rq[i]); + } + + return 0; +} + static unsigned int free_old_xmit_skbs(struct send_queue *sq) { struct sk_buff *skb; @@ -650,7 +712,8 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) { struct virtnet_info *vi = netdev_priv(dev); - struct send_queue *sq = &vi->sq; + int qnum = skb_get_queue_mapping(skb); + struct send_queue *sq = &vi->sq[qnum]; int capacity; /* Free up any pending old buffers before queueing new ones. */ @@ -664,13 +727,14 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) if (likely(capacity == -ENOMEM)) { if (net_ratelimit()) dev_warn(&dev->dev, - "TX queue failure: out of memory\n"); + "TXQ (%d) failure: out of memory\n", + qnum); } else { dev->stats.tx_fifo_errors++; if (net_ratelimit()) dev_warn(&dev->dev, - "Unexpected TX queue failure: %d\n", - capacity); + "Unexpected TXQ (%d) failure: %d\n", + qnum, capacity); } dev->stats.tx_dropped++; kfree_skb(skb); @@ -685,12 +749,12 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) /* Apparently nice girls don't return TX_BUSY; stop the queue * before it gets out of hand. Naturally, this wastes entries. */ if (capacity < 2+MAX_SKB_FRAGS) { - netif_stop_queue(dev); + netif_stop_subqueue(dev, qnum); if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { /* More just got used, free them then recheck. */ capacity += free_old_xmit_skbs(sq); if (capacity >= 2+MAX_SKB_FRAGS) { - netif_start_queue(dev); + netif_start_subqueue(dev, qnum); virtqueue_disable_cb(sq->vq); } } @@ -758,23 +822,13 @@ static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, static void virtnet_netpoll(struct net_device *dev) { struct virtnet_info *vi = netdev_priv(dev); + int i; - napi_schedule(&vi->rq.napi); + for (i = 0; i < vi->curr_queue_pairs; i++) + napi_schedule(&vi->rq[i].napi); } #endif -static int virtnet_open(struct net_device *dev) -{ - struct virtnet_info *vi = netdev_priv(dev); - - /* Make sure we have some buffers: if oom use wq. */ - if (!try_fill_recv(&vi->rq, GFP_KERNEL)) - schedule_delayed_work(&vi->refill, 0); - - virtnet_napi_enable(&vi->rq); - return 0; -} - /* * Send command via the control virtqueue and check status. Commands * supported by the hypervisor, as indicated by feature bits, should @@ -830,13 +884,39 @@ static void virtnet_ack_link_announce(struct virtnet_info *vi) rtnl_unlock(); } +static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) +{ + struct scatterlist sg; + struct virtio_net_ctrl_mq s; + struct net_device *dev = vi->dev; + + if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) + return 0; + + s.virtqueue_pairs = queue_pairs; + sg_init_one(&sg, &s, sizeof(s)); + + if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, + VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg, 1, 0)){ + dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", + queue_pairs); + return -EINVAL; + } else + vi->curr_queue_pairs = queue_pairs; + + return 0; +} + static int virtnet_close(struct net_device *dev) { struct virtnet_info *vi = netdev_priv(dev); + int i; /* Make sure refill_work doesn't re-enable napi! */ cancel_delayed_work_sync(&vi->refill); - napi_disable(&vi->rq.napi); + + for (i = 0; i < vi->max_queue_pairs; i++) + napi_disable(&vi->rq[i].napi); return 0; } @@ -943,13 +1023,41 @@ 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) +{ + int i; + + /* 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 + * 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 + 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) + vi->affinity_hint_set = true; + else + vi->affinity_hint_set = false; +} + static void virtnet_get_ringparam(struct net_device *dev, struct ethtool_ringparam *ring) { struct virtnet_info *vi = netdev_priv(dev); - ring->rx_max_pending = virtqueue_get_vring_size(vi->rq.vq); - ring->tx_max_pending = virtqueue_get_vring_size(vi->sq.vq); + ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); + ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); ring->rx_pending = ring->rx_max_pending; ring->tx_pending = ring->tx_max_pending; } @@ -984,6 +1092,21 @@ 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. + * 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(); + + 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, @@ -995,6 +1118,7 @@ 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 @@ -1030,10 +1154,10 @@ static void virtnet_config_changed_work(struct work_struct *work) if (vi->status & VIRTIO_NET_S_LINK_UP) { netif_carrier_on(vi->dev); - netif_wake_queue(vi->dev); + netif_tx_wake_all_queues(vi->dev); } else { netif_carrier_off(vi->dev); - netif_stop_queue(vi->dev); + netif_tx_stop_all_queues(vi->dev); } done: mutex_unlock(&vi->config_lock); @@ -1046,48 +1170,203 @@ static void virtnet_config_changed(struct virtio_device *vdev) schedule_work(&vi->config_work); } +static void virtnet_free_queues(struct virtnet_info *vi) +{ + kfree(vi->rq); + kfree(vi->sq); +} + +static void free_receive_bufs(struct virtnet_info *vi) +{ + int i; + + for (i = 0; i < vi->max_queue_pairs; i++) { + while (vi->rq[i].pages) + __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); + } +} + +static void free_unused_bufs(struct virtnet_info *vi) +{ + void *buf; + int i; + + for (i = 0; i < vi->max_queue_pairs; i++) { + struct virtqueue *vq = vi->sq[i].vq; + while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) + dev_kfree_skb(buf); + } + + for (i = 0; i < vi->max_queue_pairs; i++) { + struct virtqueue *vq = vi->rq[i].vq; + + while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { + if (vi->mergeable_rx_bufs || vi->big_packets) + give_pages(&vi->rq[i], buf); + else + dev_kfree_skb(buf); + --vi->rq[i].num; + } + BUG_ON(vi->rq[i].num != 0); + } +} + static void virtnet_del_vqs(struct virtnet_info *vi) { struct virtio_device *vdev = vi->vdev; + virtnet_set_affinity(vi, false); + vdev->config->del_vqs(vdev); + + virtnet_free_queues(vi); } -static int init_vqs(struct virtnet_info *vi) +static int virtnet_find_vqs(struct virtnet_info *vi) { - struct virtqueue *vqs[3]; - vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL}; - const char *names[] = { "input", "output", "control" }; - int nvqs, err; - - /* We expect two virtqueues, receive then send, - * and optionally control. */ - nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2; - - err = vi->vdev->config->find_vqs(vi->vdev, nvqs, vqs, callbacks, names); - if (err) - return err; + vq_callback_t **callbacks; + struct virtqueue **vqs; + int ret = -ENOMEM; + int i, total_vqs; + const char **names; + + /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by + * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by + * possible control vq. + */ + total_vqs = vi->max_queue_pairs * 2 + + virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); + + /* Allocate space for find_vqs parameters */ + vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); + if (!vqs) + goto err_vq; + callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); + if (!callbacks) + goto err_callback; + names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); + if (!names) + goto err_names; + + /* Parameters for control virtqueue, if any */ + if (vi->has_cvq) { + callbacks[total_vqs - 1] = NULL; + names[total_vqs - 1] = "control"; + } - vi->rq.vq = vqs[0]; - vi->sq.vq = vqs[1]; + /* Allocate/initialize parameters for send/receive virtqueues */ + for (i = 0; i < vi->max_queue_pairs; i++) { + callbacks[rxq2vq(i)] = skb_recv_done; + callbacks[txq2vq(i)] = skb_xmit_done; + sprintf(vi->rq[i].name, "input.%d", i); + sprintf(vi->sq[i].name, "output.%d", i); + names[rxq2vq(i)] = vi->rq[i].name; + names[txq2vq(i)] = vi->sq[i].name; + } - if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) { - vi->cvq = vqs[2]; + ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, + names); + if (ret) + goto err_find; + if (vi->has_cvq) { + vi->cvq = vqs[total_vqs - 1]; if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) vi->dev->features |= NETIF_F_HW_VLAN_FILTER; } + + for (i = 0; i < vi->max_queue_pairs; i++) { + vi->rq[i].vq = vqs[rxq2vq(i)]; + vi->sq[i].vq = vqs[txq2vq(i)]; + } + + kfree(names); + kfree(callbacks); + kfree(vqs); + return 0; + +err_find: + kfree(names); +err_names: + kfree(callbacks); +err_callback: + kfree(vqs); +err_vq: + return ret; +} + +static int virtnet_alloc_queues(struct virtnet_info *vi) +{ + int i; + + vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); + if (!vi->sq) + goto err_sq; + vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); + if (!vi->sq) + goto err_rq; + + INIT_DELAYED_WORK(&vi->refill, refill_work); + for (i = 0; i < vi->max_queue_pairs; i++) { + vi->rq[i].pages = NULL; + netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, + napi_weight); + + sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); + sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); + } + + return 0; + +err_rq: + kfree(vi->sq); +err_sq: + return -ENOMEM; +} + +static int init_vqs(struct virtnet_info *vi) +{ + int ret; + + /* Allocate send & receive queues */ + ret = virtnet_alloc_queues(vi); + if (ret) + goto err; + + ret = virtnet_find_vqs(vi); + if (ret) + goto err_free; + + virtnet_set_affinity(vi, true); + return 0; + +err_free: + virtnet_free_queues(vi); +err: + return ret; } static int virtnet_probe(struct virtio_device *vdev) { - int err; + int i, err; struct net_device *dev; struct virtnet_info *vi; + u16 max_queue_pairs; + + /* Find if host supports multiqueue virtio_net device */ + err = virtio_config_val(vdev, VIRTIO_NET_F_MQ, + offsetof(struct virtio_net_config, + max_virtqueue_pairs), &max_queue_pairs); + + /* We need at least 2 queue's */ + if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || + max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || + !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) + max_queue_pairs = 1; /* Allocate ourselves a network device with room for our info */ - dev = alloc_etherdev(sizeof(struct virtnet_info)); + dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); if (!dev) return -ENOMEM; @@ -1133,22 +1412,17 @@ static int virtnet_probe(struct virtio_device *vdev) /* Set up our device-specific information */ vi = netdev_priv(dev); - netif_napi_add(dev, &vi->rq.napi, virtnet_poll, napi_weight); vi->dev = dev; vi->vdev = vdev; vdev->priv = vi; - vi->rq.pages = NULL; vi->stats = alloc_percpu(struct virtnet_stats); err = -ENOMEM; if (vi->stats == NULL) goto free; - INIT_DELAYED_WORK(&vi->refill, refill_work); mutex_init(&vi->config_lock); vi->config_enable = true; INIT_WORK(&vi->config_work, virtnet_config_changed_work); - sg_init_table(vi->rq.sg, ARRAY_SIZE(vi->rq.sg)); - sg_init_table(vi->sq.sg, ARRAY_SIZE(vi->sq.sg)); /* If we can receive ANY GSO packets, we must allocate large ones. */ if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || @@ -1159,10 +1433,21 @@ static int virtnet_probe(struct virtio_device *vdev) if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) vi->mergeable_rx_bufs = true; + if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) + vi->has_cvq = true; + + /* Use single tx/rx queue pair as default */ + vi->curr_queue_pairs = 1; + vi->max_queue_pairs = max_queue_pairs; + + /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ err = init_vqs(vi); if (err) goto free_stats; + netif_set_real_num_tx_queues(dev, 1); + netif_set_real_num_rx_queues(dev, 1); + err = register_netdev(dev); if (err) { pr_debug("virtio_net: registering device failed\n"); @@ -1170,12 +1455,15 @@ static int virtnet_probe(struct virtio_device *vdev) } /* Last of all, set up some receive buffers. */ - try_fill_recv(&vi->rq, GFP_KERNEL); - - /* If we didn't even get one input buffer, we're useless. */ - if (vi->rq.num == 0) { - err = -ENOMEM; - goto unregister; + for (i = 0; i < vi->max_queue_pairs; i++) { + try_fill_recv(&vi->rq[i], GFP_KERNEL); + + /* If we didn't even get one input buffer, we're useless. */ + if (vi->rq[i].num == 0) { + free_unused_bufs(vi); + err = -ENOMEM; + goto free_recv_bufs; + } } /* Assume link up if device can't report link status, @@ -1188,12 +1476,16 @@ static int virtnet_probe(struct virtio_device *vdev) netif_carrier_on(dev); } - pr_debug("virtnet: registered device %s\n", dev->name); + pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", + dev->name, max_queue_pairs); + return 0; -unregister: +free_recv_bufs: + free_receive_bufs(vi); unregister_netdev(dev); free_vqs: + cancel_delayed_work_sync(&vi->refill); virtnet_del_vqs(vi); free_stats: free_percpu(vi->stats); @@ -1202,28 +1494,6 @@ free: return err; } -static void free_unused_bufs(struct virtnet_info *vi) -{ - void *buf; - while (1) { - buf = virtqueue_detach_unused_buf(vi->sq.vq); - if (!buf) - break; - dev_kfree_skb(buf); - } - while (1) { - buf = virtqueue_detach_unused_buf(vi->rq.vq); - if (!buf) - break; - if (vi->mergeable_rx_bufs || vi->big_packets) - give_pages(&vi->rq, buf); - else - dev_kfree_skb(buf); - --vi->rq.num; - } - BUG_ON(vi->rq.num != 0); -} - static void remove_vq_common(struct virtnet_info *vi) { vi->vdev->config->reset(vi->vdev); @@ -1231,10 +1501,9 @@ static void remove_vq_common(struct virtnet_info *vi) /* Free unused buffers in both send and recv, if any. */ free_unused_bufs(vi); - virtnet_del_vqs(vi); + free_receive_bufs(vi); - while (vi->rq.pages) - __free_pages(get_a_page(&vi->rq, GFP_KERNEL), 0); + virtnet_del_vqs(vi); } static void virtnet_remove(struct virtio_device *vdev) @@ -1260,6 +1529,7 @@ static void virtnet_remove(struct virtio_device *vdev) static int virtnet_freeze(struct virtio_device *vdev) { struct virtnet_info *vi = vdev->priv; + int i; /* Prevent config work handler from accessing the device */ mutex_lock(&vi->config_lock); @@ -1270,7 +1540,10 @@ static int virtnet_freeze(struct virtio_device *vdev) cancel_delayed_work_sync(&vi->refill); if (netif_running(vi->dev)) - napi_disable(&vi->rq.napi); + for (i = 0; i < vi->max_queue_pairs; i++) { + napi_disable(&vi->rq[i].napi); + netif_napi_del(&vi->rq[i].napi); + } remove_vq_common(vi); @@ -1282,24 +1555,28 @@ static int virtnet_freeze(struct virtio_device *vdev) static int virtnet_restore(struct virtio_device *vdev) { struct virtnet_info *vi = vdev->priv; - int err; + int err, i; err = init_vqs(vi); if (err) return err; if (netif_running(vi->dev)) - virtnet_napi_enable(&vi->rq); + for (i = 0; i < vi->max_queue_pairs; i++) + virtnet_napi_enable(&vi->rq[i]); netif_device_attach(vi->dev); - if (!try_fill_recv(&vi->rq, GFP_KERNEL)) - schedule_delayed_work(&vi->refill, 0); + for (i = 0; i < vi->max_queue_pairs; i++) + if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) + schedule_delayed_work(&vi->refill, 0); mutex_lock(&vi->config_lock); vi->config_enable = true; mutex_unlock(&vi->config_lock); + virtnet_set_queues(vi, vi->curr_queue_pairs); + return 0; } #endif @@ -1317,7 +1594,7 @@ static unsigned int features[] = { VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, - VIRTIO_NET_F_GUEST_ANNOUNCE, + VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, }; static struct virtio_driver virtio_net_driver = { diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h index 2470f54..848e358 100644 --- a/include/uapi/linux/virtio_net.h +++ b/include/uapi/linux/virtio_net.h @@ -51,6 +51,8 @@ #define VIRTIO_NET_F_CTRL_RX_EXTRA 20 /* Extra RX mode control support */ #define VIRTIO_NET_F_GUEST_ANNOUNCE 21 /* Guest can announce device on the * network */ +#define VIRTIO_NET_F_MQ 22 /* Device supports Receive Flow + * Steering */ #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */ #define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */ @@ -60,6 +62,11 @@ struct virtio_net_config { __u8 mac[6]; /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */ __u16 status; + /* Maximum number of each of transmit and receive queues; + * see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ. + * Legal values are between 1 and 0x8000 + */ + __u16 max_virtqueue_pairs; } __attribute__((packed)); /* This is the first element of the scatter-gather list. If you don't @@ -166,4 +173,24 @@ struct virtio_net_ctrl_mac { #define VIRTIO_NET_CTRL_ANNOUNCE 3 #define VIRTIO_NET_CTRL_ANNOUNCE_ACK 0 +/* + * Control Receive Flow Steering + * + * The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET + * enables Receive Flow Steering, specifying the number of the transmit and + * receive queues that will be used. After the command is consumed and acked by + * the device, the device will not steer new packets on receive virtqueues + * other than specified nor read from transmit virtqueues other than specified. + * Accordingly, driver should not transmit new packets on virtqueues other than + * specified. + */ +struct virtio_net_ctrl_mq { + u16 virtqueue_pairs; +}; + +#define VIRTIO_NET_CTRL_MQ 4 + #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0 + #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1 + #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000 + #endif /* _LINUX_VIRTIO_NET_H */ |