From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Fabian=20Silva=20Delgado?= Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/net/hyperv/netvsc_drv.c | 1004 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 1004 insertions(+) create mode 100644 drivers/net/hyperv/netvsc_drv.c (limited to 'drivers/net/hyperv/netvsc_drv.c') diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c new file mode 100644 index 000000000..5993c7e2d --- /dev/null +++ b/drivers/net/hyperv/netvsc_drv.c @@ -0,0 +1,1004 @@ +/* + * 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 +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 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_tx_start_all_queues(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; +} + +union sub_key { + u64 k; + struct { + u8 pad[3]; + u8 kb; + u32 ka; + }; +}; + +/* Toeplitz hash function + * data: network byte order + * return: host byte order + */ +static u32 comp_hash(u8 *key, int klen, void *data, int dlen) +{ + union sub_key subk; + int k_next = 4; + u8 dt; + int i, j; + u32 ret = 0; + + subk.k = 0; + subk.ka = ntohl(*(u32 *)key); + + for (i = 0; i < dlen; i++) { + subk.kb = key[k_next]; + k_next = (k_next + 1) % klen; + dt = ((u8 *)data)[i]; + for (j = 0; j < 8; j++) { + if (dt & 0x80) + ret ^= subk.ka; + dt <<= 1; + subk.k <<= 1; + } + } + + return ret; +} + +static bool netvsc_set_hash(u32 *hash, struct sk_buff *skb) +{ + struct flow_keys flow; + int data_len; + + if (!skb_flow_dissect(skb, &flow) || + !(flow.n_proto == htons(ETH_P_IP) || + flow.n_proto == htons(ETH_P_IPV6))) + return false; + + if (flow.ip_proto == IPPROTO_TCP) + data_len = 12; + else + data_len = 8; + + *hash = comp_hash(netvsc_hash_key, HASH_KEYLEN, &flow, data_len); + + return true; +} + +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 hv_device *hdev = net_device_ctx->device_ctx; + struct netvsc_device *nvsc_dev = hv_get_drvdata(hdev); + u32 hash; + u16 q_idx = 0; + + if (nvsc_dev == NULL || ndev->real_num_tx_queues <= 1) + return 0; + + if (netvsc_set_hash(&hash, skb)) { + q_idx = nvsc_dev->send_table[hash % VRSS_SEND_TAB_SIZE] % + ndev->real_num_tx_queues; + skb_set_hash(skb, hash, PKT_HASH_TYPE_L3); + } + + return q_idx; +} + +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->send_completion_tid; + + 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_netvsc_packet *packet) +{ + struct hv_page_buffer *pb = packet->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; + u32 pkt_sz; + struct hv_page_buffer page_buf[MAX_PAGE_BUFFER_COUNT]; + + + /* 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; + } + + pkt_sz = sizeof(struct hv_netvsc_packet) + RNDIS_AND_PPI_SIZE; + + ret = skb_cow_head(skb, pkt_sz); + if (ret) { + netdev_err(net, "unable to alloc hv_netvsc_packet\n"); + ret = -ENOMEM; + goto drop; + } + /* Use the headroom for building up the packet */ + packet = (struct hv_netvsc_packet *)skb->head; + + packet->status = 0; + packet->xmit_more = skb->xmit_more; + + packet->vlan_tci = skb->vlan_tci; + packet->page_buf = page_buf; + + packet->q_idx = skb_get_queue_mapping(skb); + + 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)); + + memset(packet->rndis_msg, 0, RNDIS_AND_PPI_SIZE); + + /* Set the completion routine */ + packet->send_completion = netvsc_xmit_completion; + packet->send_completion_ctx = packet; + packet->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); + + 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 = 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_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); + + ret = netvsc_send(net_device_ctx->device_ctx, packet); + +drop: + if (ret == 0) { + net->stats.tx_bytes += skb_length; + net->stats.tx_packets++; + } 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_device *net_device; + struct rndis_device *rdev; + + net_device = hv_get_drvdata(device_obj); + rdev = net_device->extension; + + switch (indicate->status) { + case RNDIS_STATUS_MEDIA_CONNECT: + rdev->link_state = false; + break; + case RNDIS_STATUS_MEDIA_DISCONNECT: + rdev->link_state = true; + break; + case RNDIS_STATUS_NETWORK_CHANGE: + rdev->link_change = true; + break; + default: + return; + } + + net = net_device->ndev; + + if (!net || net->reg_state != NETREG_REGISTERED) + return; + + ndev_ctx = netdev_priv(net); + if (!rdev->link_state) { + 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); + + skb_record_rx_queue(skb, packet->channel-> + offermsg.offer.sub_channel_index); + + 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 void netvsc_get_channels(struct net_device *net, + struct ethtool_channels *channel) +{ + struct net_device_context *net_device_ctx = netdev_priv(net); + struct hv_device *dev = net_device_ctx->device_ctx; + struct netvsc_device *nvdev = hv_get_drvdata(dev); + + if (nvdev) { + channel->max_combined = nvdev->max_chn; + channel->combined_count = nvdev->num_chn; + } +} + +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 - ETH_HLEN; + + /* Hyper-V hosts don't support MTU < ETH_DATA_LEN (1500) */ + if (mtu < ETH_DATA_LEN || 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_tx_wake_all_queues(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; +} + +#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, +}; + +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, +#ifdef CONFIG_NET_POLL_CONTROLLER + .ndo_poll_controller = netvsc_poll_controller, +#endif +}; + +/* + * 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, refresh = false; + char *argv[] = { "/etc/init.d/network", "restart", NULL }; + char *envp[] = { "HOME=/", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL }; + + 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; + if (rdev->link_change) { + rdev->link_change = false; + refresh = true; + } + } + + rtnl_unlock(); + + if (refresh) + call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC); + + 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; + struct netvsc_device *nvdev; + int ret; + u32 max_needed_headroom; + + net = alloc_etherdev_mq(sizeof(struct net_device_context), + num_online_cpus()); + if (!net) + return -ENOMEM; + + max_needed_headroom = sizeof(struct hv_netvsc_packet) + + RNDIS_AND_PPI_SIZE; + + 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); + + 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; + + net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM | + NETIF_F_TSO; + net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM | + NETIF_F_IP_CSUM | NETIF_F_TSO; + + net->ethtool_ops = ðtool_ops; + SET_NETDEV_DEV(net, &dev->device); + + /* + * Request additional head room in the skb. + * We will use this space to build the rndis + * heaser and other state we need to maintain. + */ + net->needed_headroom = max_needed_headroom; + + /* 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); + + nvdev = hv_get_drvdata(dev); + netif_set_real_num_tx_queues(net, nvdev->num_chn); + netif_set_real_num_rx_queues(net, nvdev->num_chn); + + ret = register_netdev(net); + if (ret != 0) { + pr_err("Unable to register netdev.\n"); + rndis_filter_device_remove(dev); + free_netdev(net); + } else { + schedule_delayed_work(&net_device_ctx->dwork, 0); + } + + 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); -- cgit v1.2.3