diff options
Diffstat (limited to 'drivers/net/virtio_net.c')
-rw-r--r-- | drivers/net/virtio_net.c | 245 |
1 files changed, 234 insertions, 11 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index c68808336c8..a6f1e19159d 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -37,12 +37,15 @@ module_param(gso, bool, 0444); #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) #define GOOD_COPY_LEN 128 +#define VIRTNET_SEND_COMMAND_SG_MAX 2 + struct virtnet_info { struct virtio_device *vdev; - struct virtqueue *rvq, *svq; + struct virtqueue *rvq, *svq, *cvq; struct net_device *dev; struct napi_struct napi; + unsigned int status; /* The skb we couldn't send because buffers were full. */ struct sk_buff *last_xmit_skb; @@ -375,9 +378,9 @@ static void skb_recv_done(struct virtqueue *rvq) { struct virtnet_info *vi = rvq->vdev->priv; /* Schedule NAPI, Suppress further interrupts if successful. */ - if (netif_rx_schedule_prep(&vi->napi)) { + if (napi_schedule_prep(&vi->napi)) { rvq->vq_ops->disable_cb(rvq); - __netif_rx_schedule(&vi->napi); + __napi_schedule(&vi->napi); } } @@ -403,11 +406,11 @@ again: /* Out of packets? */ if (received < budget) { - netif_rx_complete(napi); + napi_complete(napi); if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq)) && napi_schedule_prep(napi)) { vi->rvq->vq_ops->disable_cb(vi->rvq); - __netif_rx_schedule(napi); + __napi_schedule(napi); goto again; } } @@ -562,6 +565,22 @@ stop_queue: goto done; } +static int virtnet_set_mac_address(struct net_device *dev, void *p) +{ + struct virtnet_info *vi = netdev_priv(dev); + struct virtio_device *vdev = vi->vdev; + int ret; + + ret = eth_mac_addr(dev, p); + if (ret) + return ret; + + vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), + dev->dev_addr, dev->addr_len); + + return 0; +} + #ifdef CONFIG_NET_POLL_CONTROLLER static void virtnet_netpoll(struct net_device *dev) { @@ -581,13 +600,60 @@ static int virtnet_open(struct net_device *dev) * won't get another interrupt, so process any outstanding packets * now. virtnet_poll wants re-enable the queue, so we disable here. * We synchronize against interrupts via NAPI_STATE_SCHED */ - if (netif_rx_schedule_prep(&vi->napi)) { + if (napi_schedule_prep(&vi->napi)) { vi->rvq->vq_ops->disable_cb(vi->rvq); - __netif_rx_schedule(&vi->napi); + __napi_schedule(&vi->napi); } return 0; } +/* + * Send command via the control virtqueue and check status. Commands + * supported by the hypervisor, as indicated by feature bits, should + * never fail unless improperly formated. + */ +static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, + struct scatterlist *data, int out, int in) +{ + struct scatterlist sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; + struct virtio_net_ctrl_hdr ctrl; + virtio_net_ctrl_ack status = ~0; + unsigned int tmp; + + if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) { + BUG(); /* Caller should know better */ + return false; + } + + BUG_ON(out + in > VIRTNET_SEND_COMMAND_SG_MAX); + + out++; /* Add header */ + in++; /* Add return status */ + + ctrl.class = class; + ctrl.cmd = cmd; + + sg_init_table(sg, out + in); + + sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); + memcpy(&sg[1], data, sizeof(struct scatterlist) * (out + in - 2)); + sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); + + if (vi->cvq->vq_ops->add_buf(vi->cvq, sg, out, in, vi) != 0) + BUG(); + + vi->cvq->vq_ops->kick(vi->cvq); + + /* + * Spin for a response, the kick causes an ioport write, trapping + * into the hypervisor, so the request should be handled immediately. + */ + while (!vi->cvq->vq_ops->get_buf(vi->cvq, &tmp)) + cpu_relax(); + + return status == VIRTIO_NET_OK; +} + static int virtnet_close(struct net_device *dev) { struct virtnet_info *vi = netdev_priv(dev); @@ -608,10 +674,104 @@ static int virtnet_set_tx_csum(struct net_device *dev, u32 data) return ethtool_op_set_tx_hw_csum(dev, data); } +static void virtnet_set_rx_mode(struct net_device *dev) +{ + struct virtnet_info *vi = netdev_priv(dev); + struct scatterlist sg[2]; + u8 promisc, allmulti; + struct virtio_net_ctrl_mac *mac_data; + struct dev_addr_list *addr; + void *buf; + int i; + + /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ + if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) + return; + + promisc = ((dev->flags & IFF_PROMISC) != 0); + allmulti = ((dev->flags & IFF_ALLMULTI) != 0); + + sg_set_buf(sg, &promisc, sizeof(promisc)); + + if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, + VIRTIO_NET_CTRL_RX_PROMISC, + sg, 1, 0)) + dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", + promisc ? "en" : "dis"); + + sg_set_buf(sg, &allmulti, sizeof(allmulti)); + + if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, + VIRTIO_NET_CTRL_RX_ALLMULTI, + sg, 1, 0)) + dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", + allmulti ? "en" : "dis"); + + /* MAC filter - use one buffer for both lists */ + mac_data = buf = kzalloc(((dev->uc_count + dev->mc_count) * ETH_ALEN) + + (2 * sizeof(mac_data->entries)), GFP_ATOMIC); + if (!buf) { + dev_warn(&dev->dev, "No memory for MAC address buffer\n"); + return; + } + + /* Store the unicast list and count in the front of the buffer */ + mac_data->entries = dev->uc_count; + addr = dev->uc_list; + for (i = 0; i < dev->uc_count; i++, addr = addr->next) + memcpy(&mac_data->macs[i][0], addr->da_addr, ETH_ALEN); + + sg_set_buf(&sg[0], mac_data, + sizeof(mac_data->entries) + (dev->uc_count * ETH_ALEN)); + + /* multicast list and count fill the end */ + mac_data = (void *)&mac_data->macs[dev->uc_count][0]; + + mac_data->entries = dev->mc_count; + addr = dev->mc_list; + for (i = 0; i < dev->mc_count; i++, addr = addr->next) + memcpy(&mac_data->macs[i][0], addr->da_addr, ETH_ALEN); + + sg_set_buf(&sg[1], mac_data, + sizeof(mac_data->entries) + (dev->mc_count * ETH_ALEN)); + + if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, + VIRTIO_NET_CTRL_MAC_TABLE_SET, + sg, 2, 0)) + dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); + + kfree(buf); +} + +static void virnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) +{ + struct virtnet_info *vi = netdev_priv(dev); + struct scatterlist sg; + + sg_set_buf(&sg, &vid, sizeof(vid)); + + if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, + VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) + dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); +} + +static void virnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) +{ + struct virtnet_info *vi = netdev_priv(dev); + struct scatterlist sg; + + sg_set_buf(&sg, &vid, sizeof(vid)); + + if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, + VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0)) + dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); +} + static struct ethtool_ops virtnet_ethtool_ops = { .set_tx_csum = virtnet_set_tx_csum, .set_sg = ethtool_op_set_sg, .set_tso = ethtool_op_set_tso, + .get_link = ethtool_op_get_link, }; #define MIN_MTU 68 @@ -630,13 +790,51 @@ static const struct net_device_ops virtnet_netdev = { .ndo_stop = virtnet_close, .ndo_start_xmit = start_xmit, .ndo_validate_addr = eth_validate_addr, - .ndo_set_mac_address = eth_mac_addr, + .ndo_set_mac_address = virtnet_set_mac_address, + .ndo_set_rx_mode = virtnet_set_rx_mode, .ndo_change_mtu = virtnet_change_mtu, + .ndo_vlan_rx_add_vid = virnet_vlan_rx_add_vid, + .ndo_vlan_rx_kill_vid = virnet_vlan_rx_kill_vid, #ifdef CONFIG_NET_POLL_CONTROLLER .ndo_poll_controller = virtnet_netpoll, #endif }; +static void virtnet_update_status(struct virtnet_info *vi) +{ + u16 v; + + if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) + return; + + vi->vdev->config->get(vi->vdev, + offsetof(struct virtio_net_config, status), + &v, sizeof(v)); + + /* Ignore unknown (future) status bits */ + v &= VIRTIO_NET_S_LINK_UP; + + if (vi->status == v) + return; + + vi->status = v; + + if (vi->status & VIRTIO_NET_S_LINK_UP) { + netif_carrier_on(vi->dev); + netif_wake_queue(vi->dev); + } else { + netif_carrier_off(vi->dev); + netif_stop_queue(vi->dev); + } +} + +static void virtnet_config_changed(struct virtio_device *vdev) +{ + struct virtnet_info *vi = vdev->priv; + + virtnet_update_status(vi); +} + static int virtnet_probe(struct virtio_device *vdev) { int err; @@ -678,8 +876,11 @@ static int virtnet_probe(struct virtio_device *vdev) vdev->config->get(vdev, offsetof(struct virtio_net_config, mac), dev->dev_addr, dev->addr_len); - } else + } else { random_ether_addr(dev->dev_addr); + vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), + dev->dev_addr, dev->addr_len); + } /* Set up our device-specific information */ vi = netdev_priv(dev); @@ -715,6 +916,17 @@ static int virtnet_probe(struct virtio_device *vdev) goto free_recv; } + if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) { + vi->cvq = vdev->config->find_vq(vdev, 2, NULL); + if (IS_ERR(vi->cvq)) { + err = PTR_ERR(vi->svq); + goto free_send; + } + + if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) + dev->features |= NETIF_F_HW_VLAN_FILTER; + } + /* Initialize our empty receive and send queues. */ skb_queue_head_init(&vi->recv); skb_queue_head_init(&vi->send); @@ -727,7 +939,7 @@ static int virtnet_probe(struct virtio_device *vdev) err = register_netdev(dev); if (err) { pr_debug("virtio_net: registering device failed\n"); - goto free_send; + goto free_ctrl; } /* Last of all, set up some receive buffers. */ @@ -739,11 +951,18 @@ static int virtnet_probe(struct virtio_device *vdev) goto unregister; } + vi->status = VIRTIO_NET_S_LINK_UP; + virtnet_update_status(vi); + netif_carrier_on(dev); + pr_debug("virtnet: registered device %s\n", dev->name); return 0; unregister: unregister_netdev(dev); +free_ctrl: + if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) + vdev->config->del_vq(vi->cvq); free_send: vdev->config->del_vq(vi->svq); free_recv: @@ -775,6 +994,8 @@ static void virtnet_remove(struct virtio_device *vdev) vdev->config->del_vq(vi->svq); vdev->config->del_vq(vi->rvq); + if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) + vdev->config->del_vq(vi->cvq); unregister_netdev(vi->dev); while (vi->pages) @@ -794,7 +1015,8 @@ static unsigned int features[] = { VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, VIRTIO_NET_F_GUEST_ECN, /* We don't yet handle UFO input. */ - VIRTIO_NET_F_MRG_RXBUF, + 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_F_NOTIFY_ON_EMPTY, }; @@ -806,6 +1028,7 @@ static struct virtio_driver virtio_net = { .id_table = id_table, .probe = virtnet_probe, .remove = __devexit_p(virtnet_remove), + .config_changed = virtnet_config_changed, }; static int __init init(void) |