/* * 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 . * * 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 #include "hyperv_net.h" #define RING_SIZE_MIN 64 #define LINKCHANGE_INT (2 * HZ) #define NETVSC_HW_FEATURES (NETIF_F_RXCSUM | \ NETIF_F_SG | \ NETIF_F_TSO | \ NETIF_F_TSO6 | \ NETIF_F_HW_CSUM) static int ring_size = 128; module_param(ring_size, int, S_IRUGO); MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)"); static int max_num_vrss_chns = 8; static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK | NETIF_MSG_IFUP | NETIF_MSG_IFDOWN | NETIF_MSG_RX_ERR | NETIF_MSG_TX_ERR; static int debug = -1; module_param(debug, int, S_IRUGO); MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)"); static void do_set_multicast(struct work_struct *w) { struct net_device_context *ndevctx = container_of(w, struct net_device_context, work); struct hv_device *device_obj = ndevctx->device_ctx; struct net_device *ndev = hv_get_drvdata(device_obj); struct netvsc_device *nvdev = ndevctx->nvdev; struct rndis_device *rdev; if (!nvdev) return; rdev = nvdev->extension; if (rdev == NULL) return; if (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 netvsc_device *nvdev = net_device_to_netvsc_device(net); struct rndis_device *rdev; int ret = 0; netif_carrier_off(net); /* Open up the device */ ret = rndis_filter_open(nvdev); if (ret != 0) { netdev_err(net, "unable to open device (ret %d).\n", ret); return ret; } netif_tx_wake_all_queues(net); 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 netvsc_device *nvdev = net_device_ctx->nvdev; int ret; u32 aread, awrite, i, msec = 10, retry = 0, retry_max = 20; struct vmbus_channel *chn; 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(nvdev); if (ret != 0) { netdev_err(net, "unable to close device (ret %d).\n", ret); return ret; } /* Ensure pending bytes in ring are read */ while (true) { aread = 0; for (i = 0; i < nvdev->num_chn; i++) { chn = nvdev->chn_table[i]; if (!chn) continue; hv_get_ringbuffer_availbytes(&chn->inbound, &aread, &awrite); if (aread) break; hv_get_ringbuffer_availbytes(&chn->outbound, &aread, &awrite); if (aread) break; } retry++; if (retry > retry_max || aread == 0) break; msleep(msec); if (msec < 1000) msec *= 2; } if (aread) { netdev_err(net, "Ring buffer not empty after closing rndis\n"); ret = -ETIMEDOUT; } 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 u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb, void *accel_priv, select_queue_fallback_t fallback) { struct net_device_context *net_device_ctx = netdev_priv(ndev); struct netvsc_device *nvsc_dev = net_device_ctx->nvdev; u32 hash; u16 q_idx = 0; if (nvsc_dev == NULL || ndev->real_num_tx_queues <= 1) return 0; hash = skb_get_hash(skb); q_idx = nvsc_dev->send_table[hash % VRSS_SEND_TAB_SIZE] % ndev->real_num_tx_queues; if (!nvsc_dev->chn_table[q_idx]) q_idx = 0; return q_idx; } 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_netvsc_packet *packet, struct hv_page_buffer **page_buf) { struct hv_page_buffer *pb = *page_buf; 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: RNDIS header and PPI * 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]); packet->rmsg_size = len; packet->rmsg_pgcnt = 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 = NULL; int ret; unsigned int num_data_pgs; struct rndis_message *rndis_msg; struct rndis_packet *rndis_pkt; u32 rndis_msg_size; bool isvlan; bool linear = false; struct rndis_per_packet_info *ppi; struct ndis_tcp_ip_checksum_info *csum_info; struct ndis_tcp_lso_info *lso_info; int hdr_offset; u32 net_trans_info; u32 hash; u32 skb_length; struct hv_page_buffer page_buf[MAX_PAGE_BUFFER_COUNT]; struct hv_page_buffer *pb = page_buf; struct netvsc_stats *tx_stats = this_cpu_ptr(net_device_ctx->tx_stats); /* 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. If skb is scattered around * more pages we try linearizing it. */ check_size: skb_length = skb->len; num_data_pgs = netvsc_get_slots(skb) + 2; if (num_data_pgs > MAX_PAGE_BUFFER_COUNT && linear) { net_alert_ratelimited("packet too big: %u pages (%u bytes)\n", num_data_pgs, skb->len); ret = -EFAULT; goto drop; } else if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) { if (skb_linearize(skb)) { net_alert_ratelimited("failed to linearize skb\n"); ret = -ENOMEM; goto drop; } linear = true; goto check_size; } /* * Place the rndis header in the skb head room and * the skb->cb will be used for hv_netvsc_packet * structure. */ ret = skb_cow_head(skb, RNDIS_AND_PPI_SIZE); if (ret) { netdev_err(net, "unable to alloc hv_netvsc_packet\n"); ret = -ENOMEM; goto drop; } /* Use the skb control buffer for building up the packet */ BUILD_BUG_ON(sizeof(struct hv_netvsc_packet) > FIELD_SIZEOF(struct sk_buff, cb)); packet = (struct hv_netvsc_packet *)skb->cb; packet->q_idx = skb_get_queue_mapping(skb); packet->total_data_buflen = skb->len; rndis_msg = (struct rndis_message *)skb->head; memset(rndis_msg, 0, RNDIS_AND_PPI_SIZE); isvlan = skb->vlan_tci & VLAN_TAG_PRESENT; /* Add the rndis header */ 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); hash = skb_get_hash_raw(skb); if (hash != 0 && net->real_num_tx_queues > 1) { rndis_msg_size += NDIS_HASH_PPI_SIZE; ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE, NBL_HASH_VALUE); *(u32 *)((void *)ppi + ppi->ppi_offset) = hash; } 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 = skb->vlan_tci & VLAN_VID_MASK; vlan->pri = (skb->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_lso; if ((skb->ip_summed == CHECKSUM_NONE) || (skb->ip_summed == CHECKSUM_UNNECESSARY)) 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) { /* UDP checksum offload is not supported on ws2008r2. * Furthermore, on ws2012 and ws2012r2, there are some * issues with udp checksum offload from Linux guests. * (these are host issues). * For now compute the checksum here. */ struct udphdr *uh; u16 udp_len; ret = skb_cow_head(skb, 0); if (ret) goto drop; uh = udp_hdr(skb); udp_len = ntohs(uh->len); uh->check = 0; uh->check = csum_tcpudp_magic(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, udp_len, IPPROTO_UDP, csum_partial(uh, udp_len, 0)); if (uh->check == 0) uh->check = CSUM_MANGLED_0; csum_info->transmit.udp_checksum = 0; } goto do_send; do_lso: rndis_msg_size += NDIS_LSO_PPI_SIZE; ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE, TCP_LARGESEND_PKTINFO); lso_info = (struct ndis_tcp_lso_info *)((void *)ppi + ppi->ppi_offset); lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE; if (net_trans_info & (INFO_IPV4 << 16)) { lso_info->lso_v2_transmit.ip_version = NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4; ip_hdr(skb)->tot_len = 0; ip_hdr(skb)->check = 0; tcp_hdr(skb)->check = ~csum_tcpudp_magic(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0); } else { lso_info->lso_v2_transmit.ip_version = NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6; ipv6_hdr(skb)->payload_len = 0; tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0); } lso_info->lso_v2_transmit.tcp_header_offset = hdr_offset; lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size; do_send: /* Start filling in the page buffers with the rndis hdr */ rndis_msg->msg_len += rndis_msg_size; packet->total_data_buflen = rndis_msg->msg_len; packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size, skb, packet, &pb); /* timestamp packet in software */ skb_tx_timestamp(skb); ret = netvsc_send(net_device_ctx->device_ctx, packet, rndis_msg, &pb, skb); drop: if (ret == 0) { u64_stats_update_begin(&tx_stats->syncp); tx_stats->packets++; tx_stats->bytes += skb_length; u64_stats_update_end(&tx_stats->syncp); } else { 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, struct rndis_message *resp) { struct rndis_indicate_status *indicate = &resp->msg.indicate_status; struct net_device *net; struct net_device_context *ndev_ctx; struct netvsc_reconfig *event; unsigned long flags; /* Handle link change statuses only */ if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE && indicate->status != RNDIS_STATUS_MEDIA_CONNECT && indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT) return; net = hv_get_drvdata(device_obj); if (!net || net->reg_state != NETREG_REGISTERED) return; ndev_ctx = netdev_priv(net); event = kzalloc(sizeof(*event), GFP_ATOMIC); if (!event) return; event->event = indicate->status; spin_lock_irqsave(&ndev_ctx->lock, flags); list_add_tail(&event->list, &ndev_ctx->reconfig_events); spin_unlock_irqrestore(&ndev_ctx->lock, flags); schedule_delayed_work(&ndev_ctx->dwork, 0); } static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net, struct hv_netvsc_packet *packet, struct ndis_tcp_ip_checksum_info *csum_info, void *data, u16 vlan_tci) { struct sk_buff *skb; skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen); if (!skb) return skb; /* * 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), 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 (vlan_tci & VLAN_TAG_PRESENT) __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci); return skb; } /* * 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, void **data, struct ndis_tcp_ip_checksum_info *csum_info, struct vmbus_channel *channel, u16 vlan_tci) { struct net_device *net = hv_get_drvdata(device_obj); struct net_device_context *net_device_ctx = netdev_priv(net); struct sk_buff *skb; struct sk_buff *vf_skb; struct netvsc_stats *rx_stats; u32 bytes_recvd = packet->total_data_buflen; int ret = 0; if (!net || net->reg_state != NETREG_REGISTERED) return NVSP_STAT_FAIL; if (READ_ONCE(net_device_ctx->vf_inject)) { atomic_inc(&net_device_ctx->vf_use_cnt); if (!READ_ONCE(net_device_ctx->vf_inject)) { /* * We raced; just move on. */ atomic_dec(&net_device_ctx->vf_use_cnt); goto vf_injection_done; } /* * Inject this packet into the VF inerface. * On Hyper-V, multicast and brodcast packets * are only delivered on the synthetic interface * (after subjecting these to policy filters on * the host). Deliver these via the VF interface * in the guest. */ vf_skb = netvsc_alloc_recv_skb(net_device_ctx->vf_netdev, packet, csum_info, *data, vlan_tci); if (vf_skb != NULL) { ++net_device_ctx->vf_netdev->stats.rx_packets; net_device_ctx->vf_netdev->stats.rx_bytes += bytes_recvd; netif_receive_skb(vf_skb); } else { ++net->stats.rx_dropped; ret = NVSP_STAT_FAIL; } atomic_dec(&net_device_ctx->vf_use_cnt); return ret; } vf_injection_done: rx_stats = this_cpu_ptr(net_device_ctx->rx_stats); /* Allocate a skb - TODO direct I/O to pages? */ skb = netvsc_alloc_recv_skb(net, packet, csum_info, *data, vlan_tci); if (unlikely(!skb)) { ++net->stats.rx_dropped; return NVSP_STAT_FAIL; } skb_record_rx_queue(skb, channel-> offermsg.offer.sub_channel_index); u64_stats_update_begin(&rx_stats->syncp); rx_stats->packets++; rx_stats->bytes += packet->total_data_buflen; u64_stats_update_end(&rx_stats->syncp); /* * 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 void netvsc_get_channels(struct net_device *net, struct ethtool_channels *channel) { struct net_device_context *net_device_ctx = netdev_priv(net); struct netvsc_device *nvdev = net_device_ctx->nvdev; if (nvdev) { channel->max_combined = nvdev->max_chn; channel->combined_count = nvdev->num_chn; } } static int netvsc_set_channels(struct net_device *net, struct ethtool_channels *channels) { struct net_device_context *net_device_ctx = netdev_priv(net); struct hv_device *dev = net_device_ctx->device_ctx; struct netvsc_device *nvdev = net_device_ctx->nvdev; struct netvsc_device_info device_info; u32 num_chn; u32 max_chn; int ret = 0; bool recovering = false; if (net_device_ctx->start_remove || !nvdev || nvdev->destroy) return -ENODEV; num_chn = nvdev->num_chn; max_chn = min_t(u32, nvdev->max_chn, num_online_cpus()); if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5) { pr_info("vRSS unsupported before NVSP Version 5\n"); return -EINVAL; } /* We do not support rx, tx, or other */ if (!channels || channels->rx_count || channels->tx_count || channels->other_count || (channels->combined_count < 1)) return -EINVAL; if (channels->combined_count > max_chn) { pr_info("combined channels too high, using %d\n", max_chn); channels->combined_count = max_chn; } ret = netvsc_close(net); if (ret) goto out; do_set: net_device_ctx->start_remove = true; rndis_filter_device_remove(dev); nvdev->num_chn = channels->combined_count; memset(&device_info, 0, sizeof(device_info)); device_info.num_chn = nvdev->num_chn; /* passed to RNDIS */ device_info.ring_size = ring_size; device_info.max_num_vrss_chns = max_num_vrss_chns; ret = rndis_filter_device_add(dev, &device_info); if (ret) { if (recovering) { netdev_err(net, "unable to add netvsc device (ret %d)\n", ret); return ret; } goto recover; } nvdev = net_device_ctx->nvdev; ret = netif_set_real_num_tx_queues(net, nvdev->num_chn); if (ret) { if (recovering) { netdev_err(net, "could not set tx queue count (ret %d)\n", ret); return ret; } goto recover; } ret = netif_set_real_num_rx_queues(net, nvdev->num_chn); if (ret) { if (recovering) { netdev_err(net, "could not set rx queue count (ret %d)\n", ret); return ret; } goto recover; } out: netvsc_open(net); net_device_ctx->start_remove = false; /* We may have missed link change notifications */ schedule_delayed_work(&net_device_ctx->dwork, 0); return ret; recover: /* If the above failed, we attempt to recover through the same * process but with the original number of channels. */ netdev_err(net, "could not set channels, recovering\n"); recovering = true; channels->combined_count = num_chn; goto do_set; } static bool netvsc_validate_ethtool_ss_cmd(const struct ethtool_cmd *cmd) { struct ethtool_cmd diff1 = *cmd; struct ethtool_cmd diff2 = {}; ethtool_cmd_speed_set(&diff1, 0); diff1.duplex = 0; /* advertising and cmd are usually set */ diff1.advertising = 0; diff1.cmd = 0; /* We set port to PORT_OTHER */ diff2.port = PORT_OTHER; return !memcmp(&diff1, &diff2, sizeof(diff1)); } static void netvsc_init_settings(struct net_device *dev) { struct net_device_context *ndc = netdev_priv(dev); ndc->speed = SPEED_UNKNOWN; ndc->duplex = DUPLEX_UNKNOWN; } static int netvsc_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) { struct net_device_context *ndc = netdev_priv(dev); ethtool_cmd_speed_set(cmd, ndc->speed); cmd->duplex = ndc->duplex; cmd->port = PORT_OTHER; return 0; } static int netvsc_set_settings(struct net_device *dev, struct ethtool_cmd *cmd) { struct net_device_context *ndc = netdev_priv(dev); u32 speed; speed = ethtool_cmd_speed(cmd); if (!ethtool_validate_speed(speed) || !ethtool_validate_duplex(cmd->duplex) || !netvsc_validate_ethtool_ss_cmd(cmd)) return -EINVAL; ndc->speed = speed; ndc->duplex = cmd->duplex; return 0; } static int netvsc_change_mtu(struct net_device *ndev, int mtu) { struct net_device_context *ndevctx = netdev_priv(ndev); struct netvsc_device *nvdev = ndevctx->nvdev; struct hv_device *hdev = ndevctx->device_ctx; struct netvsc_device_info device_info; int limit = ETH_DATA_LEN; u32 num_chn; int ret = 0; if (ndevctx->start_remove || !nvdev || nvdev->destroy) return -ENODEV; if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2) limit = NETVSC_MTU - ETH_HLEN; if (mtu < NETVSC_MTU_MIN || mtu > limit) return -EINVAL; ret = netvsc_close(ndev); if (ret) goto out; num_chn = nvdev->num_chn; ndevctx->start_remove = true; rndis_filter_device_remove(hdev); ndev->mtu = mtu; memset(&device_info, 0, sizeof(device_info)); device_info.ring_size = ring_size; device_info.num_chn = num_chn; device_info.max_num_vrss_chns = max_num_vrss_chns; rndis_filter_device_add(hdev, &device_info); out: netvsc_open(ndev); ndevctx->start_remove = false; /* We may have missed link change notifications */ schedule_delayed_work(&ndevctx->dwork, 0); return ret; } static struct rtnl_link_stats64 *netvsc_get_stats64(struct net_device *net, struct rtnl_link_stats64 *t) { struct net_device_context *ndev_ctx = netdev_priv(net); int cpu; for_each_possible_cpu(cpu) { struct netvsc_stats *tx_stats = per_cpu_ptr(ndev_ctx->tx_stats, cpu); struct netvsc_stats *rx_stats = per_cpu_ptr(ndev_ctx->rx_stats, cpu); u64 tx_packets, tx_bytes, rx_packets, rx_bytes; unsigned int start; do { start = u64_stats_fetch_begin_irq(&tx_stats->syncp); tx_packets = tx_stats->packets; tx_bytes = tx_stats->bytes; } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start)); do { start = u64_stats_fetch_begin_irq(&rx_stats->syncp); rx_packets = rx_stats->packets; rx_bytes = rx_stats->bytes; } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start)); t->tx_bytes += tx_bytes; t->tx_packets += tx_packets; t->rx_bytes += rx_bytes; t->rx_packets += rx_packets; } t->tx_dropped = net->stats.tx_dropped; t->tx_errors = net->stats.tx_dropped; t->rx_dropped = net->stats.rx_dropped; t->rx_errors = net->stats.rx_errors; return t; } static int netvsc_set_mac_addr(struct net_device *ndev, void *p) { 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(ndev, 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; } #ifdef CONFIG_NET_POLL_CONTROLLER static void netvsc_poll_controller(struct net_device *net) { /* As netvsc_start_xmit() works synchronous we don't have to * trigger anything here. */ } #endif static const struct ethtool_ops ethtool_ops = { .get_drvinfo = netvsc_get_drvinfo, .get_link = ethtool_op_get_link, .get_channels = netvsc_get_channels, .set_channels = netvsc_set_channels, .get_ts_info = ethtool_op_get_ts_info, .get_settings = netvsc_get_settings, .set_settings = netvsc_set_settings, }; 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, .ndo_select_queue = netvsc_select_queue, .ndo_get_stats64 = netvsc_get_stats64, #ifdef CONFIG_NET_POLL_CONTROLLER .ndo_poll_controller = netvsc_poll_controller, #endif }; /* * Handle link status changes. For RNDIS_STATUS_NETWORK_CHANGE emulate link * down/up sequence. In case of RNDIS_STATUS_MEDIA_CONNECT when carrier is * present send GARP packet to network peers with netif_notify_peers(). */ static void netvsc_link_change(struct work_struct *w) { struct net_device_context *ndev_ctx = container_of(w, struct net_device_context, dwork.work); struct hv_device *device_obj = ndev_ctx->device_ctx; struct net_device *net = hv_get_drvdata(device_obj); struct netvsc_device *net_device; struct rndis_device *rdev; struct netvsc_reconfig *event = NULL; bool notify = false, reschedule = false; unsigned long flags, next_reconfig, delay; rtnl_lock(); if (ndev_ctx->start_remove) goto out_unlock; net_device = ndev_ctx->nvdev; rdev = net_device->extension; next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT; if (time_is_after_jiffies(next_reconfig)) { /* link_watch only sends one notification with current state * per second, avoid doing reconfig more frequently. Handle * wrap around. */ delay = next_reconfig - jiffies; delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT; schedule_delayed_work(&ndev_ctx->dwork, delay); goto out_unlock; } ndev_ctx->last_reconfig = jiffies; spin_lock_irqsave(&ndev_ctx->lock, flags); if (!list_empty(&ndev_ctx->reconfig_events)) { event = list_first_entry(&ndev_ctx->reconfig_events, struct netvsc_reconfig, list); list_del(&event->list); reschedule = !list_empty(&ndev_ctx->reconfig_events); } spin_unlock_irqrestore(&ndev_ctx->lock, flags); if (!event) goto out_unlock; switch (event->event) { /* Only the following events are possible due to the check in * netvsc_linkstatus_callback() */ case RNDIS_STATUS_MEDIA_CONNECT: if (rdev->link_state) { rdev->link_state = false; netif_carrier_on(net); netif_tx_wake_all_queues(net); } else { notify = true; } kfree(event); break; case RNDIS_STATUS_MEDIA_DISCONNECT: if (!rdev->link_state) { rdev->link_state = true; netif_carrier_off(net); netif_tx_stop_all_queues(net); } kfree(event); break; case RNDIS_STATUS_NETWORK_CHANGE: /* Only makes sense if carrier is present */ if (!rdev->link_state) { rdev->link_state = true; netif_carrier_off(net); netif_tx_stop_all_queues(net); event->event = RNDIS_STATUS_MEDIA_CONNECT; spin_lock_irqsave(&ndev_ctx->lock, flags); list_add(&event->list, &ndev_ctx->reconfig_events); spin_unlock_irqrestore(&ndev_ctx->lock, flags); reschedule = true; } break; } rtnl_unlock(); if (notify) netdev_notify_peers(net); /* link_watch only sends one notification with current state per * second, handle next reconfig event in 2 seconds. */ if (reschedule) schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT); return; out_unlock: rtnl_unlock(); } static void netvsc_free_netdev(struct net_device *netdev) { struct net_device_context *net_device_ctx = netdev_priv(netdev); free_percpu(net_device_ctx->tx_stats); free_percpu(net_device_ctx->rx_stats); free_netdev(netdev); } static struct net_device *get_netvsc_net_device(char *mac) { struct net_device *dev, *found = NULL; int rtnl_locked; rtnl_locked = rtnl_trylock(); for_each_netdev(&init_net, dev) { if (memcmp(dev->dev_addr, mac, ETH_ALEN) == 0) { if (dev->netdev_ops != &device_ops) continue; found = dev; break; } } if (rtnl_locked) rtnl_unlock(); return found; } static int netvsc_register_vf(struct net_device *vf_netdev) { struct net_device *ndev; struct net_device_context *net_device_ctx; struct netvsc_device *netvsc_dev; const struct ethtool_ops *eth_ops = vf_netdev->ethtool_ops; if (eth_ops == NULL || eth_ops == ðtool_ops) return NOTIFY_DONE; /* * We will use the MAC address to locate the synthetic interface to * associate with the VF interface. If we don't find a matching * synthetic interface, move on. */ ndev = get_netvsc_net_device(vf_netdev->dev_addr); if (!ndev) return NOTIFY_DONE; net_device_ctx = netdev_priv(ndev); netvsc_dev = net_device_ctx->nvdev; if (!netvsc_dev || net_device_ctx->vf_netdev) return NOTIFY_DONE; netdev_info(ndev, "VF registering: %s\n", vf_netdev->name); /* * Take a reference on the module. */ try_module_get(THIS_MODULE); net_device_ctx->vf_netdev = vf_netdev; return NOTIFY_OK; } static void netvsc_inject_enable(struct net_device_context *net_device_ctx) { net_device_ctx->vf_inject = true; } static void netvsc_inject_disable(struct net_device_context *net_device_ctx) { net_device_ctx->vf_inject = false; /* Wait for currently active users to drain out. */ while (atomic_read(&net_device_ctx->vf_use_cnt) != 0) udelay(50); } static int netvsc_vf_up(struct net_device *vf_netdev) { struct net_device *ndev; struct netvsc_device *netvsc_dev; const struct ethtool_ops *eth_ops = vf_netdev->ethtool_ops; struct net_device_context *net_device_ctx; if (eth_ops == ðtool_ops) return NOTIFY_DONE; ndev = get_netvsc_net_device(vf_netdev->dev_addr); if (!ndev) return NOTIFY_DONE; net_device_ctx = netdev_priv(ndev); netvsc_dev = net_device_ctx->nvdev; if (!netvsc_dev || !net_device_ctx->vf_netdev) return NOTIFY_DONE; netdev_info(ndev, "VF up: %s\n", vf_netdev->name); netvsc_inject_enable(net_device_ctx); /* * Open the device before switching data path. */ rndis_filter_open(netvsc_dev); /* * notify the host to switch the data path. */ netvsc_switch_datapath(ndev, true); netdev_info(ndev, "Data path switched to VF: %s\n", vf_netdev->name); netif_carrier_off(ndev); /* Now notify peers through VF device. */ call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, vf_netdev); return NOTIFY_OK; } static int netvsc_vf_down(struct net_device *vf_netdev) { struct net_device *ndev; struct netvsc_device *netvsc_dev; struct net_device_context *net_device_ctx; const struct ethtool_ops *eth_ops = vf_netdev->ethtool_ops; if (eth_ops == ðtool_ops) return NOTIFY_DONE; ndev = get_netvsc_net_device(vf_netdev->dev_addr); if (!ndev) return NOTIFY_DONE; net_device_ctx = netdev_priv(ndev); netvsc_dev = net_device_ctx->nvdev; if (!netvsc_dev || !net_device_ctx->vf_netdev) return NOTIFY_DONE; netdev_info(ndev, "VF down: %s\n", vf_netdev->name); netvsc_inject_disable(net_device_ctx); netvsc_switch_datapath(ndev, false); netdev_info(ndev, "Data path switched from VF: %s\n", vf_netdev->name); rndis_filter_close(netvsc_dev); netif_carrier_on(ndev); /* Now notify peers through netvsc device. */ call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, ndev); return NOTIFY_OK; } static int netvsc_unregister_vf(struct net_device *vf_netdev) { struct net_device *ndev; struct netvsc_device *netvsc_dev; const struct ethtool_ops *eth_ops = vf_netdev->ethtool_ops; struct net_device_context *net_device_ctx; if (eth_ops == ðtool_ops) return NOTIFY_DONE; ndev = get_netvsc_net_device(vf_netdev->dev_addr); if (!ndev) return NOTIFY_DONE; net_device_ctx = netdev_priv(ndev); netvsc_dev = net_device_ctx->nvdev; if (!netvsc_dev || !net_device_ctx->vf_netdev) return NOTIFY_DONE; netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name); netvsc_inject_disable(net_device_ctx); net_device_ctx->vf_netdev = NULL; module_put(THIS_MODULE); return NOTIFY_OK; } 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; struct netvsc_device *nvdev; int ret; net = alloc_etherdev_mq(sizeof(struct net_device_context), num_online_cpus()); if (!net) return -ENOMEM; netif_carrier_off(net); net_device_ctx = netdev_priv(net); net_device_ctx->device_ctx = dev; net_device_ctx->msg_enable = netif_msg_init(debug, default_msg); if (netif_msg_probe(net_device_ctx)) netdev_dbg(net, "netvsc msg_enable: %d\n", net_device_ctx->msg_enable); net_device_ctx->tx_stats = netdev_alloc_pcpu_stats(struct netvsc_stats); if (!net_device_ctx->tx_stats) { free_netdev(net); return -ENOMEM; } net_device_ctx->rx_stats = netdev_alloc_pcpu_stats(struct netvsc_stats); if (!net_device_ctx->rx_stats) { free_percpu(net_device_ctx->tx_stats); free_netdev(net); return -ENOMEM; } hv_set_drvdata(dev, net); net_device_ctx->start_remove = false; INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change); INIT_WORK(&net_device_ctx->work, do_set_multicast); spin_lock_init(&net_device_ctx->lock); INIT_LIST_HEAD(&net_device_ctx->reconfig_events); atomic_set(&net_device_ctx->vf_use_cnt, 0); net_device_ctx->vf_netdev = NULL; net_device_ctx->vf_inject = false; net->netdev_ops = &device_ops; net->hw_features = NETVSC_HW_FEATURES; net->features = NETVSC_HW_FEATURES | NETIF_F_HW_VLAN_CTAG_TX; net->ethtool_ops = ðtool_ops; SET_NETDEV_DEV(net, &dev->device); /* We always need headroom for rndis header */ net->needed_headroom = RNDIS_AND_PPI_SIZE; /* Notify the netvsc driver of the new device */ memset(&device_info, 0, sizeof(device_info)); device_info.ring_size = ring_size; device_info.max_num_vrss_chns = max_num_vrss_chns; ret = rndis_filter_device_add(dev, &device_info); if (ret != 0) { netdev_err(net, "unable to add netvsc device (ret %d)\n", ret); netvsc_free_netdev(net); hv_set_drvdata(dev, NULL); return ret; } memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN); nvdev = net_device_ctx->nvdev; netif_set_real_num_tx_queues(net, nvdev->num_chn); netif_set_real_num_rx_queues(net, nvdev->num_chn); netvsc_init_settings(net); ret = register_netdev(net); if (ret != 0) { pr_err("Unable to register netdev.\n"); rndis_filter_device_remove(dev); netvsc_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 = hv_get_drvdata(dev); if (net == NULL) { dev_err(&dev->device, "No net device to remove\n"); return 0; } ndev_ctx = netdev_priv(net); net_device = ndev_ctx->nvdev; /* Avoid racing with netvsc_change_mtu()/netvsc_set_channels() * removing the device. */ rtnl_lock(); ndev_ctx->start_remove = true; rtnl_unlock(); 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); hv_set_drvdata(dev, NULL); netvsc_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, }; /* * On Hyper-V, every VF interface is matched with a corresponding * synthetic interface. The synthetic interface is presented first * to the guest. When the corresponding VF instance is registered, * we will take care of switching the data path. */ static int netvsc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) { struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); /* Avoid Vlan dev with same MAC registering as VF */ if (event_dev->priv_flags & IFF_802_1Q_VLAN) return NOTIFY_DONE; /* Avoid Bonding master dev with same MAC registering as VF */ if (event_dev->priv_flags & IFF_BONDING && event_dev->flags & IFF_MASTER) return NOTIFY_DONE; switch (event) { case NETDEV_REGISTER: return netvsc_register_vf(event_dev); case NETDEV_UNREGISTER: return netvsc_unregister_vf(event_dev); case NETDEV_UP: return netvsc_vf_up(event_dev); case NETDEV_DOWN: return netvsc_vf_down(event_dev); default: return NOTIFY_DONE; } } static struct notifier_block netvsc_netdev_notifier = { .notifier_call = netvsc_netdev_event, }; static void __exit netvsc_drv_exit(void) { unregister_netdevice_notifier(&netvsc_netdev_notifier); vmbus_driver_unregister(&netvsc_drv); } static int __init netvsc_drv_init(void) { int ret; if (ring_size < RING_SIZE_MIN) { ring_size = RING_SIZE_MIN; pr_info("Increased ring_size to %d (min allowed)\n", ring_size); } ret = vmbus_driver_register(&netvsc_drv); if (ret) return ret; register_netdevice_notifier(&netvsc_netdev_notifier); return 0; } MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Microsoft Hyper-V network driver"); module_init(netvsc_drv_init); module_exit(netvsc_drv_exit);