/* * 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 #include #include "hyperv_net.h" #define RING_SIZE_MIN 64 #define LINKCHANGE_INT (2 * HZ) static int ring_size = 128; module_param(ring_size, int, S_IRUGO); MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)"); 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 netvsc_set_multicast_list(struct net_device *net) { struct net_device_context *net_device_ctx = netdev_priv(net); struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev); rndis_filter_update(nvdev); } static int netvsc_open(struct net_device *net) { struct net_device_context *ndev_ctx = netdev_priv(net); struct netvsc_device *nvdev = ndev_ctx->nvdev; 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 && !ndev_ctx->datapath) 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 = rtnl_dereference(net_device_ctx->nvdev); int ret; u32 aread, i, msec = 10, retry = 0, retry_max = 20; struct vmbus_channel *chn; netif_tx_disable(net); 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->chan_table[i].channel; if (!chn) continue; aread = hv_get_bytes_to_read(&chn->inbound); if (aread) break; aread = hv_get_bytes_to_read(&chn->outbound); 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; } /* Azure hosts don't support non-TCP port numbers in hashing yet. We compute * hash for non-TCP traffic with only IP numbers. */ static inline u32 netvsc_get_hash(struct sk_buff *skb, struct sock *sk) { struct flow_keys flow; u32 hash; static u32 hashrnd __read_mostly; net_get_random_once(&hashrnd, sizeof(hashrnd)); if (!skb_flow_dissect_flow_keys(skb, &flow, 0)) return 0; if (flow.basic.ip_proto == IPPROTO_TCP) { return skb_get_hash(skb); } else { if (flow.basic.n_proto == htons(ETH_P_IP)) hash = jhash2((u32 *)&flow.addrs.v4addrs, 2, hashrnd); else if (flow.basic.n_proto == htons(ETH_P_IPV6)) hash = jhash2((u32 *)&flow.addrs.v6addrs, 8, hashrnd); else hash = 0; skb_set_hash(skb, hash, PKT_HASH_TYPE_L3); } return hash; } static inline int netvsc_get_tx_queue(struct net_device *ndev, struct sk_buff *skb, int old_idx) { const struct net_device_context *ndc = netdev_priv(ndev); struct sock *sk = skb->sk; int q_idx; q_idx = ndc->tx_send_table[netvsc_get_hash(skb, sk) & (VRSS_SEND_TAB_SIZE - 1)]; /* If queue index changed record the new value */ if (q_idx != old_idx && sk && sk_fullsock(sk) && rcu_access_pointer(sk->sk_dst_cache)) sk_tx_queue_set(sk, q_idx); return q_idx; } /* * Select queue for transmit. * * If a valid queue has already been assigned, then use that. * Otherwise compute tx queue based on hash and the send table. * * This is basically similar to default (__netdev_pick_tx) with the added step * of using the host send_table when no other queue has been assigned. * * TODO support XPS - but get_xps_queue not exported */ static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb, void *accel_priv, select_queue_fallback_t fallback) { unsigned int num_tx_queues = ndev->real_num_tx_queues; int q_idx = sk_tx_queue_get(skb->sk); if (q_idx < 0 || skb->ooo_okay) { /* If forwarding a packet, we use the recorded queue when * available for better cache locality. */ if (skb_rx_queue_recorded(skb)) q_idx = skb_get_rx_queue(skb); else q_idx = netvsc_get_tx_queue(ndev, skb, q_idx); } while (unlikely(q_idx >= num_tx_queues)) q_idx -= num_tx_queues; 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; } /* Estimate number of page buffers neede to transmit * Need at most 2 for RNDIS header plus skb body and fragments. */ static unsigned int netvsc_get_slots(const struct sk_buff *skb) { return PFN_UP(offset_in_page(skb->data) + skb_headlen(skb)) + skb_shinfo(skb)->nr_frags + 2; } static u32 net_checksum_info(struct sk_buff *skb) { if (skb->protocol == htons(ETH_P_IP)) { struct iphdr *ip = ip_hdr(skb); if (ip->protocol == IPPROTO_TCP) return TRANSPORT_INFO_IPV4_TCP; else if (ip->protocol == IPPROTO_UDP) return TRANSPORT_INFO_IPV4_UDP; } else { struct ipv6hdr *ip6 = ipv6_hdr(skb); if (ip6->nexthdr == IPPROTO_TCP) return TRANSPORT_INFO_IPV6_TCP; else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP) return TRANSPORT_INFO_IPV6_UDP; } return TRANSPORT_INFO_NOT_IP; } 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; struct rndis_per_packet_info *ppi; u32 hash; struct hv_page_buffer page_buf[MAX_PAGE_BUFFER_COUNT]; struct hv_page_buffer *pb = page_buf; /* 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. */ num_data_pgs = netvsc_get_slots(skb); if (unlikely(num_data_pgs > MAX_PAGE_BUFFER_COUNT)) { ++net_device_ctx->eth_stats.tx_scattered; if (skb_linearize(skb)) goto no_memory; num_data_pgs = netvsc_get_slots(skb); if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) { ++net_device_ctx->eth_stats.tx_too_big; goto drop; } } /* * 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) goto no_memory; /* 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; packet->total_bytes = skb->len; packet->total_packets = 1; rndis_msg = (struct rndis_message *)skb->head; memset(rndis_msg, 0, RNDIS_AND_PPI_SIZE); /* 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 (skb_vlan_tag_present(skb)) { 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; } if (skb_is_gso(skb)) { struct ndis_tcp_lso_info *lso_info; 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 (skb->protocol == htons(ETH_P_IP)) { 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 = skb_transport_offset(skb); lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size; } else if (skb->ip_summed == CHECKSUM_PARTIAL) { if (net_checksum_info(skb) & net_device_ctx->tx_checksum_mask) { struct ndis_tcp_ip_checksum_info *csum_info; 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); csum_info->transmit.tcp_header_offset = skb_transport_offset(skb); if (skb->protocol == htons(ETH_P_IP)) { csum_info->transmit.is_ipv4 = 1; if (ip_hdr(skb)->protocol == IPPROTO_TCP) csum_info->transmit.tcp_checksum = 1; else csum_info->transmit.udp_checksum = 1; } else { csum_info->transmit.is_ipv6 = 1; if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP) csum_info->transmit.tcp_checksum = 1; else csum_info->transmit.udp_checksum = 1; } } else { /* Can't do offload of this type of checksum */ if (skb_checksum_help(skb)) goto drop; } } /* 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); if (likely(ret == 0)) return NETDEV_TX_OK; if (ret == -EAGAIN) { ++net_device_ctx->eth_stats.tx_busy; return NETDEV_TX_BUSY; } if (ret == -ENOSPC) ++net_device_ctx->eth_stats.tx_no_space; drop: dev_kfree_skb_any(skb); net->stats.tx_dropped++; return NETDEV_TX_OK; no_memory: ++net_device_ctx->eth_stats.tx_no_memory; goto drop; } /* * 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; net = hv_get_drvdata(device_obj); if (!net) return; ndev_ctx = netdev_priv(net); /* Update the physical link speed when changing to another vSwitch */ if (indicate->status == RNDIS_STATUS_LINK_SPEED_CHANGE) { u32 speed; speed = *(u32 *)((void *)indicate + indicate-> status_buf_offset) / 10000; ndev_ctx->speed = speed; return; } /* Handle these link change statuses below */ if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE && indicate->status != RNDIS_STATUS_MEDIA_CONNECT && indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT) return; if (net->reg_state != NETREG_REGISTERED) return; 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 napi_struct *napi, const struct ndis_tcp_ip_checksum_info *csum_info, const struct ndis_pkt_8021q_info *vlan, void *data, u32 buflen) { struct sk_buff *skb; skb = napi_alloc_skb(napi, buflen); if (!skb) return skb; /* * Copy to skb. This copy is needed here since the memory pointed by * hv_netvsc_packet cannot be deallocated */ skb_put_data(skb, data, buflen); skb->protocol = eth_type_trans(skb, net); /* skb is already created with CHECKSUM_NONE */ skb_checksum_none_assert(skb); /* * In Linux, the IP checksum is always checked. * Do L4 checksum offload if enabled and present. */ if (csum_info && (net->features & NETIF_F_RXCSUM)) { if (csum_info->receive.tcp_checksum_succeeded || csum_info->receive.udp_checksum_succeeded) skb->ip_summed = CHECKSUM_UNNECESSARY; } if (vlan) { u16 vlan_tci = vlan->vlanid | (vlan->pri << VLAN_PRIO_SHIFT); __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 net_device *net, struct vmbus_channel *channel, void *data, u32 len, const struct ndis_tcp_ip_checksum_info *csum_info, const struct ndis_pkt_8021q_info *vlan) { struct net_device_context *net_device_ctx = netdev_priv(net); struct netvsc_device *net_device; u16 q_idx = channel->offermsg.offer.sub_channel_index; struct netvsc_channel *nvchan; struct net_device *vf_netdev; struct sk_buff *skb; struct netvsc_stats *rx_stats; if (net->reg_state != NETREG_REGISTERED) return NVSP_STAT_FAIL; /* * If necessary, inject this packet into the VF interface. * On Hyper-V, multicast and brodcast packets are only delivered * to the synthetic interface (after subjecting these to * policy filters on the host). Deliver these via the VF * interface in the guest. */ rcu_read_lock(); net_device = rcu_dereference(net_device_ctx->nvdev); if (unlikely(!net_device)) goto drop; nvchan = &net_device->chan_table[q_idx]; vf_netdev = rcu_dereference(net_device_ctx->vf_netdev); if (vf_netdev && (vf_netdev->flags & IFF_UP)) net = vf_netdev; /* Allocate a skb - TODO direct I/O to pages? */ skb = netvsc_alloc_recv_skb(net, &nvchan->napi, csum_info, vlan, data, len); if (unlikely(!skb)) { drop: ++net->stats.rx_dropped; rcu_read_unlock(); return NVSP_STAT_FAIL; } if (net != vf_netdev) skb_record_rx_queue(skb, q_idx); /* * Even if injecting the packet, record the statistics * on the synthetic device because modifying the VF device * statistics will not work correctly. */ rx_stats = &nvchan->rx_stats; u64_stats_update_begin(&rx_stats->syncp); rx_stats->packets++; rx_stats->bytes += len; if (skb->pkt_type == PACKET_BROADCAST) ++rx_stats->broadcast; else if (skb->pkt_type == PACKET_MULTICAST) ++rx_stats->multicast; u64_stats_update_end(&rx_stats->syncp); napi_gro_receive(&nvchan->napi, skb); rcu_read_unlock(); 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 = rtnl_dereference(net_device_ctx->nvdev); if (nvdev) { channel->max_combined = nvdev->max_chn; channel->combined_count = nvdev->num_chn; } } static int netvsc_set_queues(struct net_device *net, struct hv_device *dev, u32 num_chn) { struct netvsc_device_info device_info; int ret; memset(&device_info, 0, sizeof(device_info)); device_info.num_chn = num_chn; device_info.ring_size = ring_size; device_info.max_num_vrss_chns = num_chn; ret = rndis_filter_device_add(dev, &device_info); if (ret) return ret; ret = netif_set_real_num_tx_queues(net, num_chn); if (ret) return ret; ret = netif_set_real_num_rx_queues(net, num_chn); return ret; } 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 = rtnl_dereference(net_device_ctx->nvdev); unsigned int count = channels->combined_count; bool was_running; int ret; /* We do not support separate count for rx, tx, or other */ if (count == 0 || channels->rx_count || channels->tx_count || channels->other_count) return -EINVAL; if (count > net->num_tx_queues || count > VRSS_CHANNEL_MAX) return -EINVAL; if (!nvdev || nvdev->destroy) return -ENODEV; if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5) return -EINVAL; if (count > nvdev->max_chn) return -EINVAL; was_running = netif_running(net); if (was_running) { ret = netvsc_close(net); if (ret) return ret; } rndis_filter_device_remove(dev, nvdev); ret = netvsc_set_queues(net, dev, count); if (ret == 0) nvdev->num_chn = count; else netvsc_set_queues(net, dev, nvdev->num_chn); if (was_running) ret = netvsc_open(net); /* We may have missed link change notifications */ schedule_delayed_work(&net_device_ctx->dwork, 0); return ret; } static bool netvsc_validate_ethtool_ss_cmd(const struct ethtool_link_ksettings *cmd) { struct ethtool_link_ksettings diff1 = *cmd; struct ethtool_link_ksettings diff2 = {}; diff1.base.speed = 0; diff1.base.duplex = 0; /* advertising and cmd are usually set */ ethtool_link_ksettings_zero_link_mode(&diff1, advertising); diff1.base.cmd = 0; /* We set port to PORT_OTHER */ diff2.base.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_FULL; } static int netvsc_get_link_ksettings(struct net_device *dev, struct ethtool_link_ksettings *cmd) { struct net_device_context *ndc = netdev_priv(dev); cmd->base.speed = ndc->speed; cmd->base.duplex = ndc->duplex; cmd->base.port = PORT_OTHER; return 0; } static int netvsc_set_link_ksettings(struct net_device *dev, const struct ethtool_link_ksettings *cmd) { struct net_device_context *ndc = netdev_priv(dev); u32 speed; speed = cmd->base.speed; if (!ethtool_validate_speed(speed) || !ethtool_validate_duplex(cmd->base.duplex) || !netvsc_validate_ethtool_ss_cmd(cmd)) return -EINVAL; ndc->speed = speed; ndc->duplex = cmd->base.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 = rtnl_dereference(ndevctx->nvdev); struct hv_device *hdev = ndevctx->device_ctx; struct netvsc_device_info device_info; bool was_running; int ret = 0; if (!nvdev || nvdev->destroy) return -ENODEV; was_running = netif_running(ndev); if (was_running) { ret = netvsc_close(ndev); if (ret) return ret; } memset(&device_info, 0, sizeof(device_info)); device_info.ring_size = ring_size; device_info.num_chn = nvdev->num_chn; device_info.max_num_vrss_chns = nvdev->num_chn; rndis_filter_device_remove(hdev, nvdev); /* 'nvdev' has been freed in rndis_filter_device_remove() -> * netvsc_device_remove () -> free_netvsc_device(). * We mustn't access it before it's re-created in * rndis_filter_device_add() -> netvsc_device_add(). */ ndev->mtu = mtu; rndis_filter_device_add(hdev, &device_info); if (was_running) ret = netvsc_open(ndev); /* We may have missed link change notifications */ schedule_delayed_work(&ndevctx->dwork, 0); return ret; } static void netvsc_get_stats64(struct net_device *net, struct rtnl_link_stats64 *t) { struct net_device_context *ndev_ctx = netdev_priv(net); struct netvsc_device *nvdev = rcu_dereference_rtnl(ndev_ctx->nvdev); int i; if (!nvdev) return; for (i = 0; i < nvdev->num_chn; i++) { const struct netvsc_channel *nvchan = &nvdev->chan_table[i]; const struct netvsc_stats *stats; u64 packets, bytes, multicast; unsigned int start; stats = &nvchan->tx_stats; do { start = u64_stats_fetch_begin_irq(&stats->syncp); packets = stats->packets; bytes = stats->bytes; } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); t->tx_bytes += bytes; t->tx_packets += packets; stats = &nvchan->rx_stats; do { start = u64_stats_fetch_begin_irq(&stats->syncp); packets = stats->packets; bytes = stats->bytes; multicast = stats->multicast + stats->broadcast; } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); t->rx_bytes += bytes; t->rx_packets += packets; t->multicast += multicast; } t->tx_dropped = net->stats.tx_dropped; t->tx_errors = net->stats.tx_errors; t->rx_dropped = net->stats.rx_dropped; t->rx_errors = net->stats.rx_errors; } 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; } static const struct { char name[ETH_GSTRING_LEN]; u16 offset; } netvsc_stats[] = { { "tx_scattered", offsetof(struct netvsc_ethtool_stats, tx_scattered) }, { "tx_no_memory", offsetof(struct netvsc_ethtool_stats, tx_no_memory) }, { "tx_no_space", offsetof(struct netvsc_ethtool_stats, tx_no_space) }, { "tx_too_big", offsetof(struct netvsc_ethtool_stats, tx_too_big) }, { "tx_busy", offsetof(struct netvsc_ethtool_stats, tx_busy) }, }; #define NETVSC_GLOBAL_STATS_LEN ARRAY_SIZE(netvsc_stats) /* 4 statistics per queue (rx/tx packets/bytes) */ #define NETVSC_QUEUE_STATS_LEN(dev) ((dev)->num_chn * 4) static int netvsc_get_sset_count(struct net_device *dev, int string_set) { struct net_device_context *ndc = netdev_priv(dev); struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev); if (!nvdev) return -ENODEV; switch (string_set) { case ETH_SS_STATS: return NETVSC_GLOBAL_STATS_LEN + NETVSC_QUEUE_STATS_LEN(nvdev); default: return -EINVAL; } } static void netvsc_get_ethtool_stats(struct net_device *dev, struct ethtool_stats *stats, u64 *data) { struct net_device_context *ndc = netdev_priv(dev); struct netvsc_device *nvdev = rcu_dereference(ndc->nvdev); const void *nds = &ndc->eth_stats; const struct netvsc_stats *qstats; unsigned int start; u64 packets, bytes; int i, j; if (!nvdev) return; for (i = 0; i < NETVSC_GLOBAL_STATS_LEN; i++) data[i] = *(unsigned long *)(nds + netvsc_stats[i].offset); for (j = 0; j < nvdev->num_chn; j++) { qstats = &nvdev->chan_table[j].tx_stats; do { start = u64_stats_fetch_begin_irq(&qstats->syncp); packets = qstats->packets; bytes = qstats->bytes; } while (u64_stats_fetch_retry_irq(&qstats->syncp, start)); data[i++] = packets; data[i++] = bytes; qstats = &nvdev->chan_table[j].rx_stats; do { start = u64_stats_fetch_begin_irq(&qstats->syncp); packets = qstats->packets; bytes = qstats->bytes; } while (u64_stats_fetch_retry_irq(&qstats->syncp, start)); data[i++] = packets; data[i++] = bytes; } } static void netvsc_get_strings(struct net_device *dev, u32 stringset, u8 *data) { struct net_device_context *ndc = netdev_priv(dev); struct netvsc_device *nvdev = rcu_dereference(ndc->nvdev); u8 *p = data; int i; if (!nvdev) return; switch (stringset) { case ETH_SS_STATS: for (i = 0; i < ARRAY_SIZE(netvsc_stats); i++) memcpy(p + i * ETH_GSTRING_LEN, netvsc_stats[i].name, ETH_GSTRING_LEN); p += i * ETH_GSTRING_LEN; for (i = 0; i < nvdev->num_chn; i++) { sprintf(p, "tx_queue_%u_packets", i); p += ETH_GSTRING_LEN; sprintf(p, "tx_queue_%u_bytes", i); p += ETH_GSTRING_LEN; sprintf(p, "rx_queue_%u_packets", i); p += ETH_GSTRING_LEN; sprintf(p, "rx_queue_%u_bytes", i); p += ETH_GSTRING_LEN; } break; } } static int netvsc_get_rss_hash_opts(struct netvsc_device *nvdev, struct ethtool_rxnfc *info) { info->data = RXH_IP_SRC | RXH_IP_DST; switch (info->flow_type) { case TCP_V4_FLOW: case TCP_V6_FLOW: info->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3; /* fallthrough */ case UDP_V4_FLOW: case UDP_V6_FLOW: case IPV4_FLOW: case IPV6_FLOW: break; default: info->data = 0; break; } return 0; } static int netvsc_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info, u32 *rules) { struct net_device_context *ndc = netdev_priv(dev); struct netvsc_device *nvdev = rcu_dereference(ndc->nvdev); if (!nvdev) return -ENODEV; switch (info->cmd) { case ETHTOOL_GRXRINGS: info->data = nvdev->num_chn; return 0; case ETHTOOL_GRXFH: return netvsc_get_rss_hash_opts(nvdev, info); } return -EOPNOTSUPP; } #ifdef CONFIG_NET_POLL_CONTROLLER static void netvsc_poll_controller(struct net_device *dev) { struct net_device_context *ndc = netdev_priv(dev); struct netvsc_device *ndev; int i; rcu_read_lock(); ndev = rcu_dereference(ndc->nvdev); if (ndev) { for (i = 0; i < ndev->num_chn; i++) { struct netvsc_channel *nvchan = &ndev->chan_table[i]; napi_schedule(&nvchan->napi); } } rcu_read_unlock(); } #endif static u32 netvsc_get_rxfh_key_size(struct net_device *dev) { return NETVSC_HASH_KEYLEN; } static u32 netvsc_rss_indir_size(struct net_device *dev) { return ITAB_NUM; } static int netvsc_get_rxfh(struct net_device *dev, u32 *indir, u8 *key, u8 *hfunc) { struct net_device_context *ndc = netdev_priv(dev); struct netvsc_device *ndev = rcu_dereference(ndc->nvdev); struct rndis_device *rndis_dev; int i; if (!ndev) return -ENODEV; if (hfunc) *hfunc = ETH_RSS_HASH_TOP; /* Toeplitz */ rndis_dev = ndev->extension; if (indir) { for (i = 0; i < ITAB_NUM; i++) indir[i] = rndis_dev->ind_table[i]; } if (key) memcpy(key, rndis_dev->rss_key, NETVSC_HASH_KEYLEN); return 0; } static int netvsc_set_rxfh(struct net_device *dev, const u32 *indir, const u8 *key, const u8 hfunc) { struct net_device_context *ndc = netdev_priv(dev); struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev); struct rndis_device *rndis_dev; int i; if (!ndev) return -ENODEV; if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP) return -EOPNOTSUPP; rndis_dev = ndev->extension; if (indir) { for (i = 0; i < ITAB_NUM; i++) if (indir[i] >= VRSS_CHANNEL_MAX) return -EINVAL; for (i = 0; i < ITAB_NUM; i++) rndis_dev->ind_table[i] = indir[i]; } if (!key) { if (!indir) return 0; key = rndis_dev->rss_key; } return rndis_filter_set_rss_param(rndis_dev, key, ndev->num_chn); } static const struct ethtool_ops ethtool_ops = { .get_drvinfo = netvsc_get_drvinfo, .get_link = ethtool_op_get_link, .get_ethtool_stats = netvsc_get_ethtool_stats, .get_sset_count = netvsc_get_sset_count, .get_strings = netvsc_get_strings, .get_channels = netvsc_get_channels, .set_channels = netvsc_set_channels, .get_ts_info = ethtool_op_get_ts_info, .get_rxnfc = netvsc_get_rxnfc, .get_rxfh_key_size = netvsc_get_rxfh_key_size, .get_rxfh_indir_size = netvsc_rss_indir_size, .get_rxfh = netvsc_get_rxfh, .set_rxfh = netvsc_set_rxfh, .get_link_ksettings = netvsc_get_link_ksettings, .set_link_ksettings = netvsc_set_link_ksettings, }; 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(); net_device = rtnl_dereference(ndev_ctx->nvdev); if (!net_device) goto out_unlock; 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; if (!ndev_ctx->datapath) 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 struct net_device *get_netvsc_bymac(const u8 *mac) { struct net_device *dev; ASSERT_RTNL(); for_each_netdev(&init_net, dev) { if (dev->netdev_ops != &device_ops) continue; /* not a netvsc device */ if (ether_addr_equal(mac, dev->perm_addr)) return dev; } return NULL; } static struct net_device *get_netvsc_byref(struct net_device *vf_netdev) { struct net_device *dev; ASSERT_RTNL(); for_each_netdev(&init_net, dev) { struct net_device_context *net_device_ctx; if (dev->netdev_ops != &device_ops) continue; /* not a netvsc device */ net_device_ctx = netdev_priv(dev); if (net_device_ctx->nvdev == NULL) continue; /* device is removed */ if (rtnl_dereference(net_device_ctx->vf_netdev) == vf_netdev) return dev; /* a match */ } return NULL; } 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; if (vf_netdev->addr_len != ETH_ALEN) 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_bymac(vf_netdev->perm_addr); if (!ndev) return NOTIFY_DONE; net_device_ctx = netdev_priv(ndev); netvsc_dev = rtnl_dereference(net_device_ctx->nvdev); if (!netvsc_dev || rtnl_dereference(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); dev_hold(vf_netdev); rcu_assign_pointer(net_device_ctx->vf_netdev, vf_netdev); return NOTIFY_OK; } static int netvsc_vf_up(struct net_device *vf_netdev) { struct net_device *ndev; struct netvsc_device *netvsc_dev; struct net_device_context *net_device_ctx; ndev = get_netvsc_byref(vf_netdev); if (!ndev) return NOTIFY_DONE; net_device_ctx = netdev_priv(ndev); netvsc_dev = rtnl_dereference(net_device_ctx->nvdev); netdev_info(ndev, "VF up: %s\n", vf_netdev->name); /* * 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; ndev = get_netvsc_byref(vf_netdev); if (!ndev) return NOTIFY_DONE; net_device_ctx = netdev_priv(ndev); netvsc_dev = rtnl_dereference(net_device_ctx->nvdev); netdev_info(ndev, "VF down: %s\n", vf_netdev->name); 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 net_device_context *net_device_ctx; ndev = get_netvsc_byref(vf_netdev); if (!ndev) return NOTIFY_DONE; net_device_ctx = netdev_priv(ndev); netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name); RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL); dev_put(vf_netdev); 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), VRSS_CHANNEL_MAX); if (!net) return -ENOMEM; netif_carrier_off(net); netvsc_init_settings(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); hv_set_drvdata(dev, net); INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change); spin_lock_init(&net_device_ctx->lock); INIT_LIST_HEAD(&net_device_ctx->reconfig_events); net->netdev_ops = &device_ops; 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.num_chn = VRSS_CHANNEL_DEFAULT; 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); /* hw_features computed in rndis_filter_device_add */ net->features = net->hw_features | NETIF_F_HIGHDMA | NETIF_F_SG | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX; net->vlan_features = net->features; /* RCU not necessary here, device not registered */ 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); /* MTU range: 68 - 1500 or 65521 */ net->min_mtu = NETVSC_MTU_MIN; if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2) net->max_mtu = NETVSC_MTU - ETH_HLEN; else net->max_mtu = ETH_DATA_LEN; ret = register_netdev(net); if (ret != 0) { pr_err("Unable to register netdev.\n"); rndis_filter_device_remove(dev, nvdev); free_netdev(net); } return ret; } static int netvsc_remove(struct hv_device *dev) { struct net_device *net; struct net_device_context *ndev_ctx; 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); netif_device_detach(net); cancel_delayed_work_sync(&ndev_ctx->dwork); /* * Call to the vsc driver to let it know that the device is being * removed. Also blocks mtu and channel changes. */ rtnl_lock(); rndis_filter_device_remove(dev, ndev_ctx->nvdev); rtnl_unlock(); unregister_netdev(net); hv_set_drvdata(dev, NULL); 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); /* Skip our own events */ if (event_dev->netdev_ops == &device_ops) return NOTIFY_DONE; /* Avoid non-Ethernet type devices */ if (event_dev->type != ARPHRD_ETHER) return NOTIFY_DONE; /* Avoid Vlan dev with same MAC registering as VF */ if (is_vlan_dev(event_dev)) 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);