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/* * 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, see <http://www.gnu.org/licenses/>. * * Authors: * Haiyang Zhang <haiyangz@microsoft.com> * Hank Janssen <hjanssen@microsoft.com> */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/init.h> #include <linux/atomic.h> #include <linux/module.h> #include <linux/highmem.h> #include <linux/device.h> #include <linux/io.h> #include <linux/delay.h> #include <linux/netdevice.h> #include <linux/inetdevice.h> #include <linux/etherdevice.h> #include <linux/skbuff.h> #include <linux/if_vlan.h> #include <linux/in.h> #include <linux/slab.h> #include <net/arp.h> #include <net/route.h> #include <net/sock.h> #include <net/pkt_sched.h> #include "hyperv_net.h" struct net_device_context { /* point back to our device context */ struct hv_device *device_ctx; struct delayed_work dwork; struct work_struct work; }; #define RING_SIZE_MIN 64 static int ring_size = 128; module_param(ring_size, int, S_IRUGO); MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)"); static void do_set_multicast(struct work_struct *w) { struct net_device_context *ndevctx = container_of(w, struct net_device_context, work); struct netvsc_device *nvdev; struct rndis_device *rdev; nvdev = hv_get_drvdata(ndevctx->device_ctx); if (nvdev == NULL || nvdev->ndev == NULL) return; rdev = nvdev->extension; if (rdev == NULL) return; if (nvdev->ndev->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); } static void netvsc_set_multicast_list(struct net_device *net) { struct net_device_context *net_device_ctx = netdev_priv(net); schedule_work(&net_device_ctx->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; struct netvsc_device *nvdev; struct rndis_device *rdev; int ret = 0; netif_carrier_off(net); /* 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); nvdev = hv_get_drvdata(device_obj); rdev = nvdev->extension; if (!rdev->link_state) netif_carrier_on(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); /* Make sure netvsc_set_multicast_list doesn't re-enable filter! */ cancel_work_sync(&net_device_ctx->work); ret = rndis_filter_close(device_obj); if (ret != 0) netdev_err(net, "unable to close device (ret %d).\n", ret); return ret; } static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size, int pkt_type) { struct rndis_packet *rndis_pkt; struct rndis_per_packet_info *ppi; rndis_pkt = &msg->msg.pkt; rndis_pkt->data_offset += ppi_size; ppi = (struct rndis_per_packet_info *)((void *)rndis_pkt + rndis_pkt->per_pkt_info_offset + rndis_pkt->per_pkt_info_len); ppi->size = ppi_size; ppi->type = pkt_type; ppi->ppi_offset = sizeof(struct rndis_per_packet_info); rndis_pkt->per_pkt_info_len += ppi_size; return ppi; } 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 u32 fill_pg_buf(struct page *page, u32 offset, u32 len, struct hv_page_buffer *pb) { int j = 0; /* Deal with compund pages by ignoring unused part * of the page. */ page += (offset >> PAGE_SHIFT); offset &= ~PAGE_MASK; while (len > 0) { unsigned long bytes; bytes = PAGE_SIZE - offset; if (bytes > len) bytes = len; pb[j].pfn = page_to_pfn(page); pb[j].offset = offset; pb[j].len = bytes; offset += bytes; len -= bytes; if (offset == PAGE_SIZE && len) { page++; offset = 0; j++; } } return j + 1; } static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb, struct hv_page_buffer *pb) { u32 slots_used = 0; char *data = skb->data; int frags = skb_shinfo(skb)->nr_frags; int i; /* The packet is laid out thus: * 1. hdr * 2. skb linear data * 3. skb fragment data */ if (hdr != NULL) slots_used += fill_pg_buf(virt_to_page(hdr), offset_in_page(hdr), len, &pb[slots_used]); slots_used += fill_pg_buf(virt_to_page(data), offset_in_page(data), skb_headlen(skb), &pb[slots_used]); for (i = 0; i < frags; i++) { skb_frag_t *frag = skb_shinfo(skb)->frags + i; slots_used += fill_pg_buf(skb_frag_page(frag), frag->page_offset, skb_frag_size(frag), &pb[slots_used]); } return slots_used; } static int count_skb_frag_slots(struct sk_buff *skb) { int i, frags = skb_shinfo(skb)->nr_frags; int pages = 0; for (i = 0; i < frags; i++) { skb_frag_t *frag = skb_shinfo(skb)->frags + i; unsigned long size = skb_frag_size(frag); unsigned long offset = frag->page_offset; /* Skip unused frames from start of page */ offset &= ~PAGE_MASK; pages += PFN_UP(offset + size); } return pages; } static int netvsc_get_slots(struct sk_buff *skb) { char *data = skb->data; unsigned int offset = offset_in_page(data); unsigned int len = skb_headlen(skb); int slots; int frag_slots; slots = DIV_ROUND_UP(offset + len, PAGE_SIZE); frag_slots = count_skb_frag_slots(skb); return slots + frag_slots; } static u32 get_net_transport_info(struct sk_buff *skb, u32 *trans_off) { u32 ret_val = TRANSPORT_INFO_NOT_IP; if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) && (eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) { goto not_ip; } *trans_off = skb_transport_offset(skb); if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) { struct iphdr *iphdr = ip_hdr(skb); if (iphdr->protocol == IPPROTO_TCP) ret_val = TRANSPORT_INFO_IPV4_TCP; else if (iphdr->protocol == IPPROTO_UDP) ret_val = TRANSPORT_INFO_IPV4_UDP; } else { if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP) ret_val = TRANSPORT_INFO_IPV6_TCP; else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP) ret_val = TRANSPORT_INFO_IPV6_UDP; } not_ip: return ret_val; } 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 num_data_pgs; struct rndis_message *rndis_msg; struct rndis_packet *rndis_pkt; u32 rndis_msg_size; bool isvlan; struct rndis_per_packet_info *ppi; struct ndis_tcp_ip_checksum_info *csum_info; int hdr_offset; u32 net_trans_info; /* We will atmost need two pages to describe the rndis * header. We can only transmit MAX_PAGE_BUFFER_COUNT number * of pages in a single packet. */ num_data_pgs = netvsc_get_slots(skb) + 2; if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) { netdev_err(net, "Packet too big: %u\n", skb->len); dev_kfree_skb(skb); net->stats.tx_dropped++; return NETDEV_TX_OK; } /* Allocate a netvsc packet based on # of frags. */ packet = kzalloc(sizeof(struct hv_netvsc_packet) + (num_data_pgs * sizeof(struct hv_page_buffer)) + sizeof(struct rndis_message) + NDIS_VLAN_PPI_SIZE, 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_OK; } packet->vlan_tci = skb->vlan_tci; packet->is_data_pkt = true; packet->total_data_buflen = skb->len; packet->rndis_msg = (struct rndis_message *)((unsigned long)packet + sizeof(struct hv_netvsc_packet) + (num_data_pgs * sizeof(struct hv_page_buffer))); /* 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; isvlan = packet->vlan_tci & VLAN_TAG_PRESENT; /* Add the rndis header */ rndis_msg = packet->rndis_msg; rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET; rndis_msg->msg_len = packet->total_data_buflen; rndis_pkt = &rndis_msg->msg.pkt; rndis_pkt->data_offset = sizeof(struct rndis_packet); rndis_pkt->data_len = packet->total_data_buflen; rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet); rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet); if (isvlan) { struct ndis_pkt_8021q_info *vlan; rndis_msg_size += NDIS_VLAN_PPI_SIZE; ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE, IEEE_8021Q_INFO); vlan = (struct ndis_pkt_8021q_info *)((void *)ppi + ppi->ppi_offset); vlan->vlanid = packet->vlan_tci & VLAN_VID_MASK; vlan->pri = (packet->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT; } net_trans_info = get_net_transport_info(skb, &hdr_offset); if (net_trans_info == TRANSPORT_INFO_NOT_IP) goto do_send; /* * Setup the sendside checksum offload only if this is not a * GSO packet. */ if (skb_is_gso(skb)) goto do_send; rndis_msg_size += NDIS_CSUM_PPI_SIZE; ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE, TCPIP_CHKSUM_PKTINFO); csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi + ppi->ppi_offset); if (net_trans_info & (INFO_IPV4 << 16)) csum_info->transmit.is_ipv4 = 1; else csum_info->transmit.is_ipv6 = 1; if (net_trans_info & INFO_TCP) { csum_info->transmit.tcp_checksum = 1; csum_info->transmit.tcp_header_offset = hdr_offset; } else if (net_trans_info & INFO_UDP) { csum_info->transmit.udp_checksum = 1; } do_send: /* Start filling in the page buffers with the rndis hdr */ rndis_msg->msg_len += rndis_msg_size; packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size, skb, &packet->page_buf[0]); ret = netvsc_send(net_device_ctx->device_ctx, packet); if (ret == 0) { net->stats.tx_bytes += skb->len; net->stats.tx_packets++; } else { kfree(packet); if (ret != -EAGAIN) { dev_kfree_skb_any(skb); net->stats.tx_dropped++; } } return (ret == -EAGAIN) ? 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; struct rndis_device *rdev; net_device = hv_get_drvdata(device_obj); rdev = net_device->extension; rdev->link_state = status != 1; net = net_device->ndev; if (!net || net->reg_state != NETREG_REGISTERED) return; ndev_ctx = netdev_priv(net); if (status == 1) { schedule_delayed_work(&ndev_ctx->dwork, 0); schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20)); } else { schedule_delayed_work(&ndev_ctx->dwork, 0); } } /* * 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 ndis_tcp_ip_checksum_info *csum_info) { struct net_device *net; struct sk_buff *skb; net = ((struct netvsc_device *)hv_get_drvdata(device_obj))->ndev; if (!net || net->reg_state != NETREG_REGISTERED) { packet->status = NVSP_STAT_FAIL; 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; packet->status = NVSP_STAT_FAIL; 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); if (csum_info) { /* We only look at the IP checksum here. * Should we be dropping the packet if checksum * failed? How do we deal with other checksums - TCP/UDP? */ if (csum_info->receive.ip_checksum_succeeded) skb->ip_summed = CHECKSUM_UNNECESSARY; else skb->ip_summed = CHECKSUM_NONE; } if (packet->vlan_tci & VLAN_TAG_PRESENT) __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), packet->vlan_tci); 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) { strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); } 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_work_sync(&ndevctx->work); 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 int netvsc_set_mac_addr(struct net_device *ndev, void *p) { struct net_device_context *ndevctx = netdev_priv(ndev); struct hv_device *hdev = ndevctx->device_ctx; struct sockaddr *addr = p; char save_adr[ETH_ALEN]; unsigned char save_aatype; int err; memcpy(save_adr, ndev->dev_addr, ETH_ALEN); save_aatype = ndev->addr_assign_type; err = eth_mac_addr(ndev, p); if (err != 0) return err; err = rndis_filter_set_device_mac(hdev, addr->sa_data); if (err != 0) { /* roll back to saved MAC */ memcpy(ndev->dev_addr, save_adr, ETH_ALEN); ndev->addr_assign_type = save_aatype; } return err; } 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 = netvsc_set_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. * Also, we update the carrier status here. */ static void netvsc_link_change(struct work_struct *w) { struct net_device_context *ndev_ctx; struct net_device *net; struct netvsc_device *net_device; struct rndis_device *rdev; bool notify; rtnl_lock(); ndev_ctx = container_of(w, struct net_device_context, dwork.work); net_device = hv_get_drvdata(ndev_ctx->device_ctx); rdev = net_device->extension; net = net_device->ndev; if (rdev->link_state) { netif_carrier_off(net); notify = false; } else { netif_carrier_on(net); notify = true; } rtnl_unlock(); if (notify) netdev_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; 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_link_change); INIT_WORK(&net_device_ctx->work, do_set_multicast); net->netdev_ops = &device_ops; /* TODO: Add GSO and Checksum offload */ net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM; net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM | NETIF_F_IP_CSUM; SET_ETHTOOL_OPS(net, ðtool_ops); SET_NETDEV_DEV(net, &dev->device); /* 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); free_netdev(net); hv_set_drvdata(dev, NULL); return ret; } memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN); ret = register_netdev(net); if (ret != 0) { pr_err("Unable to register netdev.\n"); rndis_filter_device_remove(dev); free_netdev(net); } 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); cancel_work_sync(&ndev_ctx->work); /* 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 */ { HV_NIC_GUID, }, { }, }; MODULE_DEVICE_TABLE(vmbus, id_table); /* The one and only one */ static struct hv_driver netvsc_drv = { .name = KBUILD_MODNAME, .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) { if (ring_size < RING_SIZE_MIN) { ring_size = RING_SIZE_MIN; pr_info("Increased ring_size to %d (min allowed)\n", ring_size); } return vmbus_driver_register(&netvsc_drv); } MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Microsoft Hyper-V network driver"); module_init(netvsc_drv_init); module_exit(netvsc_drv_exit);
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