/* * Copyright (c) 2009, Microsoft Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., 59 Temple * Place - Suite 330, Boston, MA 02111-1307 USA. * * Authors: * Haiyang Zhang * Hank Janssen */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "hyperv_net.h" struct net_device_context { /* point back to our device context */ struct hv_device *device_ctx; struct delayed_work dwork; }; static int ring_size = 128; module_param(ring_size, int, S_IRUGO); MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)"); struct set_multicast_work { struct work_struct work; struct net_device *net; }; static void do_set_multicast(struct work_struct *w) { struct set_multicast_work *swk = container_of(w, struct set_multicast_work, work); struct net_device *net = swk->net; struct net_device_context *ndevctx = netdev_priv(net); struct netvsc_device *nvdev; struct rndis_device *rdev; nvdev = hv_get_drvdata(ndevctx->device_ctx); if (nvdev == NULL) goto out; rdev = nvdev->extension; if (rdev == NULL) goto out; if (net->flags & IFF_PROMISC) rndis_filter_set_packet_filter(rdev, NDIS_PACKET_TYPE_PROMISCUOUS); else rndis_filter_set_packet_filter(rdev, NDIS_PACKET_TYPE_BROADCAST | NDIS_PACKET_TYPE_ALL_MULTICAST | NDIS_PACKET_TYPE_DIRECTED); out: kfree(w); } static void netvsc_set_multicast_list(struct net_device *net) { struct set_multicast_work *swk = kmalloc(sizeof(struct set_multicast_work), GFP_ATOMIC); if (swk == NULL) return; swk->net = net; INIT_WORK(&swk->work, do_set_multicast); schedule_work(&swk->work); } static int netvsc_open(struct net_device *net) { struct net_device_context *net_device_ctx = netdev_priv(net); struct hv_device *device_obj = net_device_ctx->device_ctx; int ret = 0; /* Open up the device */ ret = rndis_filter_open(device_obj); if (ret != 0) { netdev_err(net, "unable to open device (ret %d).\n", ret); return ret; } netif_start_queue(net); return ret; } static int netvsc_close(struct net_device *net) { struct net_device_context *net_device_ctx = netdev_priv(net); struct hv_device *device_obj = net_device_ctx->device_ctx; int ret; netif_tx_disable(net); ret = rndis_filter_close(device_obj); if (ret != 0) netdev_err(net, "unable to close device (ret %d).\n", ret); return ret; } static void netvsc_xmit_completion(void *context) { struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)context; struct sk_buff *skb = (struct sk_buff *) (unsigned long)packet->completion.send.send_completion_tid; kfree(packet); if (skb) dev_kfree_skb_any(skb); } static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net) { struct net_device_context *net_device_ctx = netdev_priv(net); struct hv_netvsc_packet *packet; int ret; unsigned int i, num_pages, npg_data; /* Add multipage for skb->data and additional one for RNDIS */ npg_data = (((unsigned long)skb->data + skb_headlen(skb) - 1) >> PAGE_SHIFT) - ((unsigned long)skb->data >> PAGE_SHIFT) + 1; num_pages = skb_shinfo(skb)->nr_frags + npg_data + 1; /* Allocate a netvsc packet based on # of frags. */ packet = kzalloc(sizeof(struct hv_netvsc_packet) + (num_pages * sizeof(struct hv_page_buffer)) + sizeof(struct rndis_filter_packet), GFP_ATOMIC); if (!packet) { /* out of memory, drop packet */ netdev_err(net, "unable to allocate hv_netvsc_packet\n"); dev_kfree_skb(skb); net->stats.tx_dropped++; return NETDEV_TX_BUSY; } packet->extension = (void *)(unsigned long)packet + sizeof(struct hv_netvsc_packet) + (num_pages * sizeof(struct hv_page_buffer)); /* Setup the rndis header */ packet->page_buf_cnt = num_pages; /* Initialize it from the skb */ packet->total_data_buflen = skb->len; /* Start filling in the page buffers starting after RNDIS buffer. */ packet->page_buf[1].pfn = virt_to_phys(skb->data) >> PAGE_SHIFT; packet->page_buf[1].offset = (unsigned long)skb->data & (PAGE_SIZE - 1); if (npg_data == 1) packet->page_buf[1].len = skb_headlen(skb); else packet->page_buf[1].len = PAGE_SIZE - packet->page_buf[1].offset; for (i = 2; i <= npg_data; i++) { packet->page_buf[i].pfn = virt_to_phys(skb->data + PAGE_SIZE * (i-1)) >> PAGE_SHIFT; packet->page_buf[i].offset = 0; packet->page_buf[i].len = PAGE_SIZE; } if (npg_data > 1) packet->page_buf[npg_data].len = (((unsigned long)skb->data + skb_headlen(skb) - 1) & (PAGE_SIZE - 1)) + 1; /* Additional fragments are after SKB data */ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { const skb_frag_t *f = &skb_shinfo(skb)->frags[i]; packet->page_buf[i+npg_data+1].pfn = page_to_pfn(skb_frag_page(f)); packet->page_buf[i+npg_data+1].offset = f->page_offset; packet->page_buf[i+npg_data+1].len = skb_frag_size(f); } /* Set the completion routine */ packet->completion.send.send_completion = netvsc_xmit_completion; packet->completion.send.send_completion_ctx = packet; packet->completion.send.send_completion_tid = (unsigned long)skb; ret = rndis_filter_send(net_device_ctx->device_ctx, packet); if (ret == 0) { net->stats.tx_bytes += skb->len; net->stats.tx_packets++; } else { /* we are shutting down or bus overloaded, just drop packet */ net->stats.tx_dropped++; kfree(packet); dev_kfree_skb_any(skb); } return ret ? NETDEV_TX_BUSY : NETDEV_TX_OK; } /* * netvsc_linkstatus_callback - Link up/down notification */ void netvsc_linkstatus_callback(struct hv_device *device_obj, unsigned int status) { struct net_device *net; struct net_device_context *ndev_ctx; struct netvsc_device *net_device; net_device = hv_get_drvdata(device_obj); net = net_device->ndev; if (!net) { netdev_err(net, "got link status but net device " "not initialized yet\n"); return; } if (status == 1) { netif_carrier_on(net); netif_wake_queue(net); ndev_ctx = netdev_priv(net); schedule_delayed_work(&ndev_ctx->dwork, 0); schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20)); } else { netif_carrier_off(net); netif_tx_disable(net); } } /* * netvsc_recv_callback - Callback when we receive a packet from the * "wire" on the specified device. */ int netvsc_recv_callback(struct hv_device *device_obj, struct hv_netvsc_packet *packet) { struct net_device *net = dev_get_drvdata(&device_obj->device); struct sk_buff *skb; struct netvsc_device *net_device; net_device = hv_get_drvdata(device_obj); net = net_device->ndev; if (!net) { netdev_err(net, "got receive callback but net device" " not initialized yet\n"); return 0; } /* Allocate a skb - TODO direct I/O to pages? */ skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen); if (unlikely(!skb)) { ++net->stats.rx_dropped; return 0; } /* * Copy to skb. This copy is needed here since the memory pointed by * hv_netvsc_packet cannot be deallocated */ memcpy(skb_put(skb, packet->total_data_buflen), packet->data, packet->total_data_buflen); skb->protocol = eth_type_trans(skb, net); skb->ip_summed = CHECKSUM_NONE; net->stats.rx_packets++; net->stats.rx_bytes += packet->total_data_buflen; /* * Pass the skb back up. Network stack will deallocate the skb when it * is done. * TODO - use NAPI? */ netif_rx(skb); return 0; } static void netvsc_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info) { strcpy(info->driver, "hv_netvsc"); strcpy(info->version, HV_DRV_VERSION); strcpy(info->fw_version, "N/A"); } static int netvsc_change_mtu(struct net_device *ndev, int mtu) { struct net_device_context *ndevctx = netdev_priv(ndev); struct hv_device *hdev = ndevctx->device_ctx; struct netvsc_device *nvdev = hv_get_drvdata(hdev); struct netvsc_device_info device_info; int limit = ETH_DATA_LEN; if (nvdev == NULL || nvdev->destroy) return -ENODEV; if (nvdev->nvsp_version == NVSP_PROTOCOL_VERSION_2) limit = NETVSC_MTU; if (mtu < 68 || mtu > limit) return -EINVAL; nvdev->start_remove = true; cancel_delayed_work_sync(&ndevctx->dwork); netif_tx_disable(ndev); rndis_filter_device_remove(hdev); ndev->mtu = mtu; ndevctx->device_ctx = hdev; hv_set_drvdata(hdev, ndev); device_info.ring_size = ring_size; rndis_filter_device_add(hdev, &device_info); netif_wake_queue(ndev); return 0; } static const struct ethtool_ops ethtool_ops = { .get_drvinfo = netvsc_get_drvinfo, .get_link = ethtool_op_get_link, }; static const struct net_device_ops device_ops = { .ndo_open = netvsc_open, .ndo_stop = netvsc_close, .ndo_start_xmit = netvsc_start_xmit, .ndo_set_rx_mode = netvsc_set_multicast_list, .ndo_change_mtu = netvsc_change_mtu, .ndo_validate_addr = eth_validate_addr, .ndo_set_mac_address = eth_mac_addr, }; /* * Send GARP packet to network peers after migrations. * After Quick Migration, the network is not immediately operational in the * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add * another netif_notify_peers() into a delayed work, otherwise GARP packet * will not be sent after quick migration, and cause network disconnection. */ static void netvsc_send_garp(struct work_struct *w) { struct net_device_context *ndev_ctx; struct net_device *net; struct netvsc_device *net_device; ndev_ctx = container_of(w, struct net_device_context, dwork.work); net_device = hv_get_drvdata(ndev_ctx->device_ctx); net = net_device->ndev; netif_notify_peers(net); } static int netvsc_probe(struct hv_device *dev, const struct hv_vmbus_device_id *dev_id) { struct net_device *net = NULL; struct net_device_context *net_device_ctx; struct netvsc_device_info device_info; int ret; net = alloc_etherdev(sizeof(struct net_device_context)); if (!net) return -ENOMEM; /* Set initial state */ netif_carrier_off(net); net_device_ctx = netdev_priv(net); net_device_ctx->device_ctx = dev; hv_set_drvdata(dev, net); INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_send_garp); net->netdev_ops = &device_ops; /* TODO: Add GSO and Checksum offload */ net->hw_features = NETIF_F_SG; net->features = NETIF_F_SG; SET_ETHTOOL_OPS(net, ðtool_ops); SET_NETDEV_DEV(net, &dev->device); ret = register_netdev(net); if (ret != 0) { pr_err("Unable to register netdev.\n"); free_netdev(net); goto out; } /* Notify the netvsc driver of the new device */ device_info.ring_size = ring_size; ret = rndis_filter_device_add(dev, &device_info); if (ret != 0) { netdev_err(net, "unable to add netvsc device (ret %d)\n", ret); unregister_netdev(net); free_netdev(net); hv_set_drvdata(dev, NULL); return ret; } memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN); netif_carrier_on(net); out: return ret; } static int netvsc_remove(struct hv_device *dev) { struct net_device *net; struct net_device_context *ndev_ctx; struct netvsc_device *net_device; net_device = hv_get_drvdata(dev); net = net_device->ndev; if (net == NULL) { dev_err(&dev->device, "No net device to remove\n"); return 0; } net_device->start_remove = true; ndev_ctx = netdev_priv(net); cancel_delayed_work_sync(&ndev_ctx->dwork); /* Stop outbound asap */ netif_tx_disable(net); unregister_netdev(net); /* * Call to the vsc driver to let it know that the device is being * removed */ rndis_filter_device_remove(dev); free_netdev(net); return 0; } static const struct hv_vmbus_device_id id_table[] = { /* Network guid */ { VMBUS_DEVICE(0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46, 0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E) }, { }, }; MODULE_DEVICE_TABLE(vmbus, id_table); /* The one and only one */ static struct hv_driver netvsc_drv = { .name = "netvsc", .id_table = id_table, .probe = netvsc_probe, .remove = netvsc_remove, }; static void __exit netvsc_drv_exit(void) { vmbus_driver_unregister(&netvsc_drv); } static int __init netvsc_drv_init(void) { return vmbus_driver_register(&netvsc_drv); } MODULE_LICENSE("GPL"); MODULE_VERSION(HV_DRV_VERSION); MODULE_DESCRIPTION("Microsoft Hyper-V network driver"); module_init(netvsc_drv_init); module_exit(netvsc_drv_exit);