diff options
Diffstat (limited to 'drivers/net/hyperv/netvsc_drv.c')
-rw-r--r-- | drivers/net/hyperv/netvsc_drv.c | 2823 |
1 files changed, 2823 insertions, 0 deletions
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c new file mode 100644 index 000000000..c1aac6ceb --- /dev/null +++ b/drivers/net/hyperv/netvsc_drv.c @@ -0,0 +1,2823 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2009, Microsoft Corporation. + * + * Authors: + * Haiyang Zhang <haiyangz@microsoft.com> + * Hank Janssen <hjanssen@microsoft.com> + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/init.h> +#include <linux/atomic.h> +#include <linux/ethtool.h> +#include <linux/module.h> +#include <linux/highmem.h> +#include <linux/device.h> +#include <linux/io.h> +#include <linux/delay.h> +#include <linux/netdevice.h> +#include <linux/inetdevice.h> +#include <linux/etherdevice.h> +#include <linux/pci.h> +#include <linux/skbuff.h> +#include <linux/if_vlan.h> +#include <linux/in.h> +#include <linux/slab.h> +#include <linux/rtnetlink.h> +#include <linux/netpoll.h> +#include <linux/bpf.h> + +#include <net/arp.h> +#include <net/route.h> +#include <net/sock.h> +#include <net/pkt_sched.h> +#include <net/checksum.h> +#include <net/ip6_checksum.h> + +#include "hyperv_net.h" + +#define RING_SIZE_MIN 64 + +#define LINKCHANGE_INT (2 * HZ) +#define VF_TAKEOVER_INT (HZ / 10) + +static unsigned int ring_size __ro_after_init = 128; +module_param(ring_size, uint, 0444); +MODULE_PARM_DESC(ring_size, "Ring buffer size (# of 4K pages)"); +unsigned int netvsc_ring_bytes __ro_after_init; + +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, 0444); +MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)"); + +static LIST_HEAD(netvsc_dev_list); + +static void netvsc_change_rx_flags(struct net_device *net, int change) +{ + struct net_device_context *ndev_ctx = netdev_priv(net); + struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev); + int inc; + + if (!vf_netdev) + return; + + if (change & IFF_PROMISC) { + inc = (net->flags & IFF_PROMISC) ? 1 : -1; + dev_set_promiscuity(vf_netdev, inc); + } + + if (change & IFF_ALLMULTI) { + inc = (net->flags & IFF_ALLMULTI) ? 1 : -1; + dev_set_allmulti(vf_netdev, inc); + } +} + +static void netvsc_set_rx_mode(struct net_device *net) +{ + struct net_device_context *ndev_ctx = netdev_priv(net); + struct net_device *vf_netdev; + struct netvsc_device *nvdev; + + rcu_read_lock(); + vf_netdev = rcu_dereference(ndev_ctx->vf_netdev); + if (vf_netdev) { + dev_uc_sync(vf_netdev, net); + dev_mc_sync(vf_netdev, net); + } + + nvdev = rcu_dereference(ndev_ctx->nvdev); + if (nvdev) + rndis_filter_update(nvdev); + rcu_read_unlock(); +} + +static void netvsc_tx_enable(struct netvsc_device *nvscdev, + struct net_device *ndev) +{ + nvscdev->tx_disable = false; + virt_wmb(); /* ensure queue wake up mechanism is on */ + + netif_tx_wake_all_queues(ndev); +} + +static int netvsc_open(struct net_device *net) +{ + struct net_device_context *ndev_ctx = netdev_priv(net); + struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev); + struct netvsc_device *nvdev = rtnl_dereference(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; + } + + rdev = nvdev->extension; + if (!rdev->link_state) { + netif_carrier_on(net); + netvsc_tx_enable(nvdev, net); + } + + if (vf_netdev) { + /* Setting synthetic device up transparently sets + * slave as up. If open fails, then slave will be + * still be offline (and not used). + */ + ret = dev_open(vf_netdev, NULL); + if (ret) + netdev_warn(net, + "unable to open slave: %s: %d\n", + vf_netdev->name, ret); + } + return 0; +} + +static int netvsc_wait_until_empty(struct netvsc_device *nvdev) +{ + unsigned int retry = 0; + int i; + + /* Ensure pending bytes in ring are read */ + for (;;) { + u32 aread = 0; + + for (i = 0; i < nvdev->num_chn; i++) { + struct vmbus_channel *chn + = nvdev->chan_table[i].channel; + + if (!chn) + continue; + + /* make sure receive not running now */ + napi_synchronize(&nvdev->chan_table[i].napi); + + aread = hv_get_bytes_to_read(&chn->inbound); + if (aread) + break; + + aread = hv_get_bytes_to_read(&chn->outbound); + if (aread) + break; + } + + if (aread == 0) + return 0; + + if (++retry > RETRY_MAX) + return -ETIMEDOUT; + + usleep_range(RETRY_US_LO, RETRY_US_HI); + } +} + +static void netvsc_tx_disable(struct netvsc_device *nvscdev, + struct net_device *ndev) +{ + if (nvscdev) { + nvscdev->tx_disable = true; + virt_wmb(); /* ensure txq will not wake up after stop */ + } + + netif_tx_disable(ndev); +} + +static int netvsc_close(struct net_device *net) +{ + struct net_device_context *net_device_ctx = netdev_priv(net); + struct net_device *vf_netdev + = rtnl_dereference(net_device_ctx->vf_netdev); + struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev); + int ret; + + netvsc_tx_disable(nvdev, net); + + /* No need to close rndis filter if it is removed already */ + if (!nvdev) + return 0; + + ret = rndis_filter_close(nvdev); + if (ret != 0) { + netdev_err(net, "unable to close device (ret %d).\n", ret); + return ret; + } + + ret = netvsc_wait_until_empty(nvdev); + if (ret) + netdev_err(net, "Ring buffer not empty after closing rndis\n"); + + if (vf_netdev) + dev_close(vf_netdev); + + return ret; +} + +static inline void *init_ppi_data(struct rndis_message *msg, + u32 ppi_size, u32 pkt_type) +{ + struct rndis_packet *rndis_pkt = &msg->msg.pkt; + struct rndis_per_packet_info *ppi; + + rndis_pkt->data_offset += ppi_size; + ppi = (void *)rndis_pkt + rndis_pkt->per_pkt_info_offset + + rndis_pkt->per_pkt_info_len; + + ppi->size = ppi_size; + ppi->type = pkt_type; + ppi->internal = 0; + ppi->ppi_offset = sizeof(struct rndis_per_packet_info); + + rndis_pkt->per_pkt_info_len += ppi_size; + + return ppi + 1; +} + +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_table[netvsc_get_hash(skb, ndc) & + (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_pick_tx(struct net_device *ndev, struct sk_buff *skb) +{ + int q_idx = sk_tx_queue_get(skb->sk); + + if (q_idx < 0 || skb->ooo_okay || q_idx >= ndev->real_num_tx_queues) { + /* 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); + } + + return q_idx; +} + +static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb, + struct net_device *sb_dev) +{ + struct net_device_context *ndc = netdev_priv(ndev); + struct net_device *vf_netdev; + u16 txq; + + rcu_read_lock(); + vf_netdev = rcu_dereference(ndc->vf_netdev); + if (vf_netdev) { + const struct net_device_ops *vf_ops = vf_netdev->netdev_ops; + + if (vf_ops->ndo_select_queue) + txq = vf_ops->ndo_select_queue(vf_netdev, skb, sb_dev); + else + txq = netdev_pick_tx(vf_netdev, skb, NULL); + + /* Record the queue selected by VF so that it can be + * used for common case where VF has more queues than + * the synthetic device. + */ + qdisc_skb_cb(skb)->slave_dev_queue_mapping = txq; + } else { + txq = netvsc_pick_tx(ndev, skb); + } + rcu_read_unlock(); + + while (txq >= ndev->real_num_tx_queues) + txq -= ndev->real_num_tx_queues; + + return txq; +} + +static u32 fill_pg_buf(unsigned long hvpfn, u32 offset, u32 len, + struct hv_page_buffer *pb) +{ + int j = 0; + + hvpfn += offset >> HV_HYP_PAGE_SHIFT; + offset = offset & ~HV_HYP_PAGE_MASK; + + while (len > 0) { + unsigned long bytes; + + bytes = HV_HYP_PAGE_SIZE - offset; + if (bytes > len) + bytes = len; + pb[j].pfn = hvpfn; + pb[j].offset = offset; + pb[j].len = bytes; + + offset += bytes; + len -= bytes; + + if (offset == HV_HYP_PAGE_SIZE && len) { + hvpfn++; + 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) +{ + 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 + */ + slots_used += fill_pg_buf(virt_to_hvpfn(hdr), + offset_in_hvpage(hdr), + len, + &pb[slots_used]); + + packet->rmsg_size = len; + packet->rmsg_pgcnt = slots_used; + + slots_used += fill_pg_buf(virt_to_hvpfn(data), + offset_in_hvpage(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(page_to_hvpfn(skb_frag_page(frag)), + skb_frag_off(frag), + 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 = skb_frag_off(frag); + + /* Skip unused frames from start of page */ + offset &= ~HV_HYP_PAGE_MASK; + pages += HVPFN_UP(offset + size); + } + return pages; +} + +static int netvsc_get_slots(struct sk_buff *skb) +{ + char *data = skb->data; + unsigned int offset = offset_in_hvpage(data); + unsigned int len = skb_headlen(skb); + int slots; + int frag_slots; + + slots = DIV_ROUND_UP(offset + len, HV_HYP_PAGE_SIZE); + frag_slots = count_skb_frag_slots(skb); + return slots + frag_slots; +} + +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 (ip6->nexthdr == IPPROTO_UDP) + return TRANSPORT_INFO_IPV6_UDP; + } + + return TRANSPORT_INFO_NOT_IP; +} + +/* Send skb on the slave VF device. */ +static int netvsc_vf_xmit(struct net_device *net, struct net_device *vf_netdev, + struct sk_buff *skb) +{ + struct net_device_context *ndev_ctx = netdev_priv(net); + unsigned int len = skb->len; + int rc; + + skb->dev = vf_netdev; + skb_record_rx_queue(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping); + + rc = dev_queue_xmit(skb); + if (likely(rc == NET_XMIT_SUCCESS || rc == NET_XMIT_CN)) { + struct netvsc_vf_pcpu_stats *pcpu_stats + = this_cpu_ptr(ndev_ctx->vf_stats); + + u64_stats_update_begin(&pcpu_stats->syncp); + pcpu_stats->tx_packets++; + pcpu_stats->tx_bytes += len; + u64_stats_update_end(&pcpu_stats->syncp); + } else { + this_cpu_inc(ndev_ctx->vf_stats->tx_dropped); + } + + return rc; +} + +static int netvsc_xmit(struct sk_buff *skb, struct net_device *net, bool xdp_tx) +{ + 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 net_device *vf_netdev; + u32 rndis_msg_size; + u32 hash; + struct hv_page_buffer pb[MAX_PAGE_BUFFER_COUNT]; + + /* If VF is present and up then redirect packets to it. + * Skip the VF if it is marked down or has no carrier. + * If netpoll is in uses, then VF can not be used either. + */ + vf_netdev = rcu_dereference_bh(net_device_ctx->vf_netdev); + if (vf_netdev && netif_running(vf_netdev) && + netif_carrier_ok(vf_netdev) && !netpoll_tx_running(net) && + net_device_ctx->data_path_is_vf) + return netvsc_vf_xmit(net, vf_netdev, skb); + + /* 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. + */ + + num_data_pgs = netvsc_get_slots(skb) + 2; + + 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) + 2; + 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) > + sizeof_field(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; + + /* Add the rndis header */ + rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET; + rndis_msg->msg_len = packet->total_data_buflen; + + rndis_msg->msg.pkt = (struct rndis_packet) { + .data_offset = sizeof(struct rndis_packet), + .data_len = packet->total_data_buflen, + .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) { + u32 *hash_info; + + rndis_msg_size += NDIS_HASH_PPI_SIZE; + hash_info = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE, + NBL_HASH_VALUE); + *hash_info = hash; + } + + /* When using AF_PACKET we need to drop VLAN header from + * the frame and update the SKB to allow the HOST OS + * to transmit the 802.1Q packet + */ + if (skb->protocol == htons(ETH_P_8021Q)) { + u16 vlan_tci; + + skb_reset_mac_header(skb); + if (eth_type_vlan(eth_hdr(skb)->h_proto)) { + if (unlikely(__skb_vlan_pop(skb, &vlan_tci) != 0)) { + ++net_device_ctx->eth_stats.vlan_error; + goto drop; + } + + __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci); + /* Update the NDIS header pkt lengths */ + packet->total_data_buflen -= VLAN_HLEN; + packet->total_bytes -= VLAN_HLEN; + rndis_msg->msg_len = packet->total_data_buflen; + rndis_msg->msg.pkt.data_len = packet->total_data_buflen; + } + } + + if (skb_vlan_tag_present(skb)) { + struct ndis_pkt_8021q_info *vlan; + + rndis_msg_size += NDIS_VLAN_PPI_SIZE; + vlan = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE, + IEEE_8021Q_INFO); + + vlan->value = 0; + vlan->vlanid = skb_vlan_tag_get_id(skb); + vlan->cfi = skb_vlan_tag_get_cfi(skb); + vlan->pri = skb_vlan_tag_get_prio(skb); + } + + if (skb_is_gso(skb)) { + struct ndis_tcp_lso_info *lso_info; + + rndis_msg_size += NDIS_LSO_PPI_SIZE; + lso_info = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE, + TCP_LARGESEND_PKTINFO); + + lso_info->value = 0; + 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; + tcp_v6_gso_csum_prep(skb); + } + 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; + csum_info = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE, + TCPIP_CHKSUM_PKTINFO); + + csum_info->value = 0; + 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, packet, rndis_msg, pb, skb, xdp_tx); + 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; +} + +static netdev_tx_t netvsc_start_xmit(struct sk_buff *skb, + struct net_device *ndev) +{ + return netvsc_xmit(skb, ndev, false); +} + +/* + * netvsc_linkstatus_callback - Link up/down notification + */ +void netvsc_linkstatus_callback(struct net_device *net, + struct rndis_message *resp, + void *data, u32 data_buflen) +{ + struct rndis_indicate_status *indicate = &resp->msg.indicate_status; + struct net_device_context *ndev_ctx = netdev_priv(net); + struct netvsc_reconfig *event; + unsigned long flags; + + /* Ensure the packet is big enough to access its fields */ + if (resp->msg_len - RNDIS_HEADER_SIZE < sizeof(struct rndis_indicate_status)) { + netdev_err(net, "invalid rndis_indicate_status packet, len: %u\n", + resp->msg_len); + return; + } + + /* Copy the RNDIS indicate status into nvchan->recv_buf */ + memcpy(indicate, data + RNDIS_HEADER_SIZE, sizeof(*indicate)); + + /* Update the physical link speed when changing to another vSwitch */ + if (indicate->status == RNDIS_STATUS_LINK_SPEED_CHANGE) { + u32 speed; + + /* Validate status_buf_offset and status_buflen. + * + * Certain (pre-Fe) implementations of Hyper-V's vSwitch didn't account + * for the status buffer field in resp->msg_len; perform the validation + * using data_buflen (>= resp->msg_len). + */ + if (indicate->status_buflen < sizeof(speed) || + indicate->status_buf_offset < sizeof(*indicate) || + data_buflen - RNDIS_HEADER_SIZE < indicate->status_buf_offset || + data_buflen - RNDIS_HEADER_SIZE - indicate->status_buf_offset + < indicate->status_buflen) { + netdev_err(net, "invalid rndis_indicate_status packet\n"); + return; + } + + speed = *(u32 *)(data + RNDIS_HEADER_SIZE + 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); +} + +/* This function should only be called after skb_record_rx_queue() */ +void netvsc_xdp_xmit(struct sk_buff *skb, struct net_device *ndev) +{ + int rc; + + skb->queue_mapping = skb_get_rx_queue(skb); + __skb_push(skb, ETH_HLEN); + + rc = netvsc_xmit(skb, ndev, true); + + if (dev_xmit_complete(rc)) + return; + + dev_kfree_skb_any(skb); + ndev->stats.tx_dropped++; +} + +static void netvsc_comp_ipcsum(struct sk_buff *skb) +{ + struct iphdr *iph = (struct iphdr *)skb->data; + + iph->check = 0; + iph->check = ip_fast_csum(iph, iph->ihl); +} + +static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net, + struct netvsc_channel *nvchan, + struct xdp_buff *xdp) +{ + struct napi_struct *napi = &nvchan->napi; + const struct ndis_pkt_8021q_info *vlan = &nvchan->rsc.vlan; + const struct ndis_tcp_ip_checksum_info *csum_info = + &nvchan->rsc.csum_info; + const u32 *hash_info = &nvchan->rsc.hash_info; + u8 ppi_flags = nvchan->rsc.ppi_flags; + struct sk_buff *skb; + void *xbuf = xdp->data_hard_start; + int i; + + if (xbuf) { + unsigned int hdroom = xdp->data - xdp->data_hard_start; + unsigned int xlen = xdp->data_end - xdp->data; + unsigned int frag_size = xdp->frame_sz; + + skb = build_skb(xbuf, frag_size); + + if (!skb) { + __free_page(virt_to_page(xbuf)); + return NULL; + } + + skb_reserve(skb, hdroom); + skb_put(skb, xlen); + skb->dev = napi->dev; + } else { + skb = napi_alloc_skb(napi, nvchan->rsc.pktlen); + + if (!skb) + return NULL; + + /* Copy to skb. This copy is needed here since the memory + * pointed by hv_netvsc_packet cannot be deallocated. + */ + for (i = 0; i < nvchan->rsc.cnt; i++) + skb_put_data(skb, nvchan->rsc.data[i], + nvchan->rsc.len[i]); + } + + skb->protocol = eth_type_trans(skb, net); + + /* skb is already created with CHECKSUM_NONE */ + skb_checksum_none_assert(skb); + + /* Incoming packets may have IP header checksum verified by the host. + * They may not have IP header checksum computed after coalescing. + * We compute it here if the flags are set, because on Linux, the IP + * checksum is always checked. + */ + if ((ppi_flags & NVSC_RSC_CSUM_INFO) && csum_info->receive.ip_checksum_value_invalid && + csum_info->receive.ip_checksum_succeeded && + skb->protocol == htons(ETH_P_IP)) { + /* Check that there is enough space to hold the IP header. */ + if (skb_headlen(skb) < sizeof(struct iphdr)) { + kfree_skb(skb); + return NULL; + } + netvsc_comp_ipcsum(skb); + } + + /* Do L4 checksum offload if enabled and present. */ + if ((ppi_flags & NVSC_RSC_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 ((ppi_flags & NVSC_RSC_HASH_INFO) && (net->features & NETIF_F_RXHASH)) + skb_set_hash(skb, *hash_info, PKT_HASH_TYPE_L4); + + if (ppi_flags & NVSC_RSC_VLAN) { + u16 vlan_tci = vlan->vlanid | (vlan->pri << VLAN_PRIO_SHIFT) | + (vlan->cfi ? VLAN_CFI_MASK : 0); + + __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 netvsc_device *net_device, + struct netvsc_channel *nvchan) +{ + struct net_device_context *net_device_ctx = netdev_priv(net); + struct vmbus_channel *channel = nvchan->channel; + u16 q_idx = channel->offermsg.offer.sub_channel_index; + struct sk_buff *skb; + struct netvsc_stats_rx *rx_stats = &nvchan->rx_stats; + struct xdp_buff xdp; + u32 act; + + if (net->reg_state != NETREG_REGISTERED) + return NVSP_STAT_FAIL; + + act = netvsc_run_xdp(net, nvchan, &xdp); + + if (act == XDP_REDIRECT) + return NVSP_STAT_SUCCESS; + + if (act != XDP_PASS && act != XDP_TX) { + u64_stats_update_begin(&rx_stats->syncp); + rx_stats->xdp_drop++; + u64_stats_update_end(&rx_stats->syncp); + + return NVSP_STAT_SUCCESS; /* consumed by XDP */ + } + + /* Allocate a skb - TODO direct I/O to pages? */ + skb = netvsc_alloc_recv_skb(net, nvchan, &xdp); + + if (unlikely(!skb)) { + ++net_device_ctx->eth_stats.rx_no_memory; + return NVSP_STAT_FAIL; + } + + 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. + */ + u64_stats_update_begin(&rx_stats->syncp); + if (act == XDP_TX) + rx_stats->xdp_tx++; + + rx_stats->packets++; + rx_stats->bytes += nvchan->rsc.pktlen; + + 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); + + if (act == XDP_TX) { + netvsc_xdp_xmit(skb, net); + return NVSP_STAT_SUCCESS; + } + + napi_gro_receive(&nvchan->napi, skb); + return NVSP_STAT_SUCCESS; +} + +static void netvsc_get_drvinfo(struct net_device *net, + struct ethtool_drvinfo *info) +{ + strscpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); + strscpy(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; + } +} + +/* Alloc struct netvsc_device_info, and initialize it from either existing + * struct netvsc_device, or from default values. + */ +static +struct netvsc_device_info *netvsc_devinfo_get(struct netvsc_device *nvdev) +{ + struct netvsc_device_info *dev_info; + struct bpf_prog *prog; + + dev_info = kzalloc(sizeof(*dev_info), GFP_ATOMIC); + + if (!dev_info) + return NULL; + + if (nvdev) { + ASSERT_RTNL(); + + dev_info->num_chn = nvdev->num_chn; + dev_info->send_sections = nvdev->send_section_cnt; + dev_info->send_section_size = nvdev->send_section_size; + dev_info->recv_sections = nvdev->recv_section_cnt; + dev_info->recv_section_size = nvdev->recv_section_size; + + memcpy(dev_info->rss_key, nvdev->extension->rss_key, + NETVSC_HASH_KEYLEN); + + prog = netvsc_xdp_get(nvdev); + if (prog) { + bpf_prog_inc(prog); + dev_info->bprog = prog; + } + } else { + dev_info->num_chn = VRSS_CHANNEL_DEFAULT; + dev_info->send_sections = NETVSC_DEFAULT_TX; + dev_info->send_section_size = NETVSC_SEND_SECTION_SIZE; + dev_info->recv_sections = NETVSC_DEFAULT_RX; + dev_info->recv_section_size = NETVSC_RECV_SECTION_SIZE; + } + + return dev_info; +} + +/* Free struct netvsc_device_info */ +static void netvsc_devinfo_put(struct netvsc_device_info *dev_info) +{ + if (dev_info->bprog) { + ASSERT_RTNL(); + bpf_prog_put(dev_info->bprog); + } + + kfree(dev_info); +} + +static int netvsc_detach(struct net_device *ndev, + struct netvsc_device *nvdev) +{ + struct net_device_context *ndev_ctx = netdev_priv(ndev); + struct hv_device *hdev = ndev_ctx->device_ctx; + int ret; + + /* Don't try continuing to try and setup sub channels */ + if (cancel_work_sync(&nvdev->subchan_work)) + nvdev->num_chn = 1; + + netvsc_xdp_set(ndev, NULL, NULL, nvdev); + + /* If device was up (receiving) then shutdown */ + if (netif_running(ndev)) { + netvsc_tx_disable(nvdev, ndev); + + ret = rndis_filter_close(nvdev); + if (ret) { + netdev_err(ndev, + "unable to close device (ret %d).\n", ret); + return ret; + } + + ret = netvsc_wait_until_empty(nvdev); + if (ret) { + netdev_err(ndev, + "Ring buffer not empty after closing rndis\n"); + return ret; + } + } + + netif_device_detach(ndev); + + rndis_filter_device_remove(hdev, nvdev); + + return 0; +} + +static int netvsc_attach(struct net_device *ndev, + struct netvsc_device_info *dev_info) +{ + struct net_device_context *ndev_ctx = netdev_priv(ndev); + struct hv_device *hdev = ndev_ctx->device_ctx; + struct netvsc_device *nvdev; + struct rndis_device *rdev; + struct bpf_prog *prog; + int ret = 0; + + nvdev = rndis_filter_device_add(hdev, dev_info); + if (IS_ERR(nvdev)) + return PTR_ERR(nvdev); + + if (nvdev->num_chn > 1) { + ret = rndis_set_subchannel(ndev, nvdev, dev_info); + + /* if unavailable, just proceed with one queue */ + if (ret) { + nvdev->max_chn = 1; + nvdev->num_chn = 1; + } + } + + prog = dev_info->bprog; + if (prog) { + bpf_prog_inc(prog); + ret = netvsc_xdp_set(ndev, prog, NULL, nvdev); + if (ret) { + bpf_prog_put(prog); + goto err1; + } + } + + /* In any case device is now ready */ + nvdev->tx_disable = false; + netif_device_attach(ndev); + + /* Note: enable and attach happen when sub-channels setup */ + netif_carrier_off(ndev); + + if (netif_running(ndev)) { + ret = rndis_filter_open(nvdev); + if (ret) + goto err2; + + rdev = nvdev->extension; + if (!rdev->link_state) + netif_carrier_on(ndev); + } + + return 0; + +err2: + netif_device_detach(ndev); + +err1: + rndis_filter_device_remove(hdev, nvdev); + + 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 netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev); + unsigned int orig, count = channels->combined_count; + struct netvsc_device_info *device_info; + 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 (!nvdev || nvdev->destroy) + return -ENODEV; + + if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5) + return -EINVAL; + + if (count > nvdev->max_chn) + return -EINVAL; + + orig = nvdev->num_chn; + + device_info = netvsc_devinfo_get(nvdev); + + if (!device_info) + return -ENOMEM; + + device_info->num_chn = count; + + ret = netvsc_detach(net, nvdev); + if (ret) + goto out; + + ret = netvsc_attach(net, device_info); + if (ret) { + device_info->num_chn = orig; + if (netvsc_attach(net, device_info)) + netdev_err(net, "restoring channel setting failed\n"); + } + +out: + netvsc_devinfo_put(device_info); + return ret; +} + +static void netvsc_init_settings(struct net_device *dev) +{ + struct net_device_context *ndc = netdev_priv(dev); + + ndc->l4_hash = HV_DEFAULT_L4HASH; + + ndc->speed = SPEED_UNKNOWN; + ndc->duplex = DUPLEX_FULL; + + dev->features = NETIF_F_LRO; +} + +static int netvsc_get_link_ksettings(struct net_device *dev, + struct ethtool_link_ksettings *cmd) +{ + struct net_device_context *ndc = netdev_priv(dev); + struct net_device *vf_netdev; + + vf_netdev = rtnl_dereference(ndc->vf_netdev); + + if (vf_netdev) + return __ethtool_get_link_ksettings(vf_netdev, cmd); + + 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); + struct net_device *vf_netdev = rtnl_dereference(ndc->vf_netdev); + + if (vf_netdev) { + if (!vf_netdev->ethtool_ops->set_link_ksettings) + return -EOPNOTSUPP; + + return vf_netdev->ethtool_ops->set_link_ksettings(vf_netdev, + cmd); + } + + return ethtool_virtdev_set_link_ksettings(dev, cmd, + &ndc->speed, &ndc->duplex); +} + +static int netvsc_change_mtu(struct net_device *ndev, int mtu) +{ + struct net_device_context *ndevctx = netdev_priv(ndev); + struct net_device *vf_netdev = rtnl_dereference(ndevctx->vf_netdev); + struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev); + int orig_mtu = ndev->mtu; + struct netvsc_device_info *device_info; + int ret = 0; + + if (!nvdev || nvdev->destroy) + return -ENODEV; + + device_info = netvsc_devinfo_get(nvdev); + + if (!device_info) + return -ENOMEM; + + /* Change MTU of underlying VF netdev first. */ + if (vf_netdev) { + ret = dev_set_mtu(vf_netdev, mtu); + if (ret) + goto out; + } + + ret = netvsc_detach(ndev, nvdev); + if (ret) + goto rollback_vf; + + ndev->mtu = mtu; + + ret = netvsc_attach(ndev, device_info); + if (!ret) + goto out; + + /* Attempt rollback to original MTU */ + ndev->mtu = orig_mtu; + + if (netvsc_attach(ndev, device_info)) + netdev_err(ndev, "restoring mtu failed\n"); +rollback_vf: + if (vf_netdev) + dev_set_mtu(vf_netdev, orig_mtu); + +out: + netvsc_devinfo_put(device_info); + return ret; +} + +static void netvsc_get_vf_stats(struct net_device *net, + struct netvsc_vf_pcpu_stats *tot) +{ + struct net_device_context *ndev_ctx = netdev_priv(net); + int i; + + memset(tot, 0, sizeof(*tot)); + + for_each_possible_cpu(i) { + const struct netvsc_vf_pcpu_stats *stats + = per_cpu_ptr(ndev_ctx->vf_stats, i); + u64 rx_packets, rx_bytes, tx_packets, tx_bytes; + unsigned int start; + + do { + start = u64_stats_fetch_begin_irq(&stats->syncp); + rx_packets = stats->rx_packets; + tx_packets = stats->tx_packets; + rx_bytes = stats->rx_bytes; + tx_bytes = stats->tx_bytes; + } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); + + tot->rx_packets += rx_packets; + tot->tx_packets += tx_packets; + tot->rx_bytes += rx_bytes; + tot->tx_bytes += tx_bytes; + tot->tx_dropped += stats->tx_dropped; + } +} + +static void netvsc_get_pcpu_stats(struct net_device *net, + struct netvsc_ethtool_pcpu_stats *pcpu_tot) +{ + struct net_device_context *ndev_ctx = netdev_priv(net); + struct netvsc_device *nvdev = rcu_dereference_rtnl(ndev_ctx->nvdev); + int i; + + /* fetch percpu stats of vf */ + for_each_possible_cpu(i) { + const struct netvsc_vf_pcpu_stats *stats = + per_cpu_ptr(ndev_ctx->vf_stats, i); + struct netvsc_ethtool_pcpu_stats *this_tot = &pcpu_tot[i]; + unsigned int start; + + do { + start = u64_stats_fetch_begin_irq(&stats->syncp); + this_tot->vf_rx_packets = stats->rx_packets; + this_tot->vf_tx_packets = stats->tx_packets; + this_tot->vf_rx_bytes = stats->rx_bytes; + this_tot->vf_tx_bytes = stats->tx_bytes; + } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); + this_tot->rx_packets = this_tot->vf_rx_packets; + this_tot->tx_packets = this_tot->vf_tx_packets; + this_tot->rx_bytes = this_tot->vf_rx_bytes; + this_tot->tx_bytes = this_tot->vf_tx_bytes; + } + + /* fetch percpu stats of netvsc */ + for (i = 0; i < nvdev->num_chn; i++) { + const struct netvsc_channel *nvchan = &nvdev->chan_table[i]; + const struct netvsc_stats_tx *tx_stats; + const struct netvsc_stats_rx *rx_stats; + struct netvsc_ethtool_pcpu_stats *this_tot = + &pcpu_tot[nvchan->channel->target_cpu]; + u64 packets, bytes; + unsigned int start; + + tx_stats = &nvchan->tx_stats; + do { + start = u64_stats_fetch_begin_irq(&tx_stats->syncp); + packets = tx_stats->packets; + bytes = tx_stats->bytes; + } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start)); + + this_tot->tx_bytes += bytes; + this_tot->tx_packets += packets; + + rx_stats = &nvchan->rx_stats; + do { + start = u64_stats_fetch_begin_irq(&rx_stats->syncp); + packets = rx_stats->packets; + bytes = rx_stats->bytes; + } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start)); + + this_tot->rx_bytes += bytes; + this_tot->rx_packets += packets; + } +} + +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; + struct netvsc_vf_pcpu_stats vf_tot; + int i; + + rcu_read_lock(); + + nvdev = rcu_dereference(ndev_ctx->nvdev); + if (!nvdev) + goto out; + + netdev_stats_to_stats64(t, &net->stats); + + netvsc_get_vf_stats(net, &vf_tot); + t->rx_packets += vf_tot.rx_packets; + t->tx_packets += vf_tot.tx_packets; + t->rx_bytes += vf_tot.rx_bytes; + t->tx_bytes += vf_tot.tx_bytes; + t->tx_dropped += vf_tot.tx_dropped; + + for (i = 0; i < nvdev->num_chn; i++) { + const struct netvsc_channel *nvchan = &nvdev->chan_table[i]; + const struct netvsc_stats_tx *tx_stats; + const struct netvsc_stats_rx *rx_stats; + u64 packets, bytes, multicast; + unsigned int start; + + tx_stats = &nvchan->tx_stats; + do { + start = u64_stats_fetch_begin_irq(&tx_stats->syncp); + packets = tx_stats->packets; + bytes = tx_stats->bytes; + } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start)); + + t->tx_bytes += bytes; + t->tx_packets += packets; + + rx_stats = &nvchan->rx_stats; + do { + start = u64_stats_fetch_begin_irq(&rx_stats->syncp); + packets = rx_stats->packets; + bytes = rx_stats->bytes; + multicast = rx_stats->multicast + rx_stats->broadcast; + } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start)); + + t->rx_bytes += bytes; + t->rx_packets += packets; + t->multicast += multicast; + } +out: + rcu_read_unlock(); +} + +static int netvsc_set_mac_addr(struct net_device *ndev, void *p) +{ + struct net_device_context *ndc = netdev_priv(ndev); + struct net_device *vf_netdev = rtnl_dereference(ndc->vf_netdev); + struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev); + struct sockaddr *addr = p; + int err; + + err = eth_prepare_mac_addr_change(ndev, p); + if (err) + return err; + + if (!nvdev) + return -ENODEV; + + if (vf_netdev) { + err = dev_set_mac_address(vf_netdev, addr, NULL); + if (err) + return err; + } + + err = rndis_filter_set_device_mac(nvdev, addr->sa_data); + if (!err) { + eth_commit_mac_addr_change(ndev, p); + } else if (vf_netdev) { + /* rollback change on VF */ + memcpy(addr->sa_data, ndev->dev_addr, ETH_ALEN); + dev_set_mac_address(vf_netdev, addr, NULL); + } + + 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) }, + { "tx_send_full", offsetof(struct netvsc_ethtool_stats, tx_send_full) }, + { "rx_comp_busy", offsetof(struct netvsc_ethtool_stats, rx_comp_busy) }, + { "rx_no_memory", offsetof(struct netvsc_ethtool_stats, rx_no_memory) }, + { "stop_queue", offsetof(struct netvsc_ethtool_stats, stop_queue) }, + { "wake_queue", offsetof(struct netvsc_ethtool_stats, wake_queue) }, + { "vlan_error", offsetof(struct netvsc_ethtool_stats, vlan_error) }, +}, pcpu_stats[] = { + { "cpu%u_rx_packets", + offsetof(struct netvsc_ethtool_pcpu_stats, rx_packets) }, + { "cpu%u_rx_bytes", + offsetof(struct netvsc_ethtool_pcpu_stats, rx_bytes) }, + { "cpu%u_tx_packets", + offsetof(struct netvsc_ethtool_pcpu_stats, tx_packets) }, + { "cpu%u_tx_bytes", + offsetof(struct netvsc_ethtool_pcpu_stats, tx_bytes) }, + { "cpu%u_vf_rx_packets", + offsetof(struct netvsc_ethtool_pcpu_stats, vf_rx_packets) }, + { "cpu%u_vf_rx_bytes", + offsetof(struct netvsc_ethtool_pcpu_stats, vf_rx_bytes) }, + { "cpu%u_vf_tx_packets", + offsetof(struct netvsc_ethtool_pcpu_stats, vf_tx_packets) }, + { "cpu%u_vf_tx_bytes", + offsetof(struct netvsc_ethtool_pcpu_stats, vf_tx_bytes) }, +}, vf_stats[] = { + { "vf_rx_packets", offsetof(struct netvsc_vf_pcpu_stats, rx_packets) }, + { "vf_rx_bytes", offsetof(struct netvsc_vf_pcpu_stats, rx_bytes) }, + { "vf_tx_packets", offsetof(struct netvsc_vf_pcpu_stats, tx_packets) }, + { "vf_tx_bytes", offsetof(struct netvsc_vf_pcpu_stats, tx_bytes) }, + { "vf_tx_dropped", offsetof(struct netvsc_vf_pcpu_stats, tx_dropped) }, +}; + +#define NETVSC_GLOBAL_STATS_LEN ARRAY_SIZE(netvsc_stats) +#define NETVSC_VF_STATS_LEN ARRAY_SIZE(vf_stats) + +/* statistics per queue (rx/tx packets/bytes) */ +#define NETVSC_PCPU_STATS_LEN (num_present_cpus() * ARRAY_SIZE(pcpu_stats)) + +/* 8 statistics per queue (rx/tx packets/bytes, XDP actions) */ +#define NETVSC_QUEUE_STATS_LEN(dev) ((dev)->num_chn * 8) + +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_VF_STATS_LEN + + NETVSC_QUEUE_STATS_LEN(nvdev) + + NETVSC_PCPU_STATS_LEN; + 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 = rtnl_dereference(ndc->nvdev); + const void *nds = &ndc->eth_stats; + const struct netvsc_stats_tx *tx_stats; + const struct netvsc_stats_rx *rx_stats; + struct netvsc_vf_pcpu_stats sum; + struct netvsc_ethtool_pcpu_stats *pcpu_sum; + unsigned int start; + u64 packets, bytes; + u64 xdp_drop; + u64 xdp_redirect; + u64 xdp_tx; + u64 xdp_xmit; + int i, j, cpu; + + if (!nvdev) + return; + + for (i = 0; i < NETVSC_GLOBAL_STATS_LEN; i++) + data[i] = *(unsigned long *)(nds + netvsc_stats[i].offset); + + netvsc_get_vf_stats(dev, &sum); + for (j = 0; j < NETVSC_VF_STATS_LEN; j++) + data[i++] = *(u64 *)((void *)&sum + vf_stats[j].offset); + + for (j = 0; j < nvdev->num_chn; j++) { + tx_stats = &nvdev->chan_table[j].tx_stats; + + do { + start = u64_stats_fetch_begin_irq(&tx_stats->syncp); + packets = tx_stats->packets; + bytes = tx_stats->bytes; + xdp_xmit = tx_stats->xdp_xmit; + } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start)); + data[i++] = packets; + data[i++] = bytes; + data[i++] = xdp_xmit; + + rx_stats = &nvdev->chan_table[j].rx_stats; + do { + start = u64_stats_fetch_begin_irq(&rx_stats->syncp); + packets = rx_stats->packets; + bytes = rx_stats->bytes; + xdp_drop = rx_stats->xdp_drop; + xdp_redirect = rx_stats->xdp_redirect; + xdp_tx = rx_stats->xdp_tx; + } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start)); + data[i++] = packets; + data[i++] = bytes; + data[i++] = xdp_drop; + data[i++] = xdp_redirect; + data[i++] = xdp_tx; + } + + pcpu_sum = kvmalloc_array(num_possible_cpus(), + sizeof(struct netvsc_ethtool_pcpu_stats), + GFP_KERNEL); + if (!pcpu_sum) + return; + + netvsc_get_pcpu_stats(dev, pcpu_sum); + for_each_present_cpu(cpu) { + struct netvsc_ethtool_pcpu_stats *this_sum = &pcpu_sum[cpu]; + + for (j = 0; j < ARRAY_SIZE(pcpu_stats); j++) + data[i++] = *(u64 *)((void *)this_sum + + pcpu_stats[j].offset); + } + kvfree(pcpu_sum); +} + +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 = rtnl_dereference(ndc->nvdev); + u8 *p = data; + int i, cpu; + + if (!nvdev) + return; + + switch (stringset) { + case ETH_SS_STATS: + for (i = 0; i < ARRAY_SIZE(netvsc_stats); i++) + ethtool_sprintf(&p, netvsc_stats[i].name); + + for (i = 0; i < ARRAY_SIZE(vf_stats); i++) + ethtool_sprintf(&p, vf_stats[i].name); + + for (i = 0; i < nvdev->num_chn; i++) { + ethtool_sprintf(&p, "tx_queue_%u_packets", i); + ethtool_sprintf(&p, "tx_queue_%u_bytes", i); + ethtool_sprintf(&p, "tx_queue_%u_xdp_xmit", i); + ethtool_sprintf(&p, "rx_queue_%u_packets", i); + ethtool_sprintf(&p, "rx_queue_%u_bytes", i); + ethtool_sprintf(&p, "rx_queue_%u_xdp_drop", i); + ethtool_sprintf(&p, "rx_queue_%u_xdp_redirect", i); + ethtool_sprintf(&p, "rx_queue_%u_xdp_tx", i); + } + + for_each_present_cpu(cpu) { + for (i = 0; i < ARRAY_SIZE(pcpu_stats); i++) + ethtool_sprintf(&p, pcpu_stats[i].name, cpu); + } + + break; + } +} + +static int +netvsc_get_rss_hash_opts(struct net_device_context *ndc, + struct ethtool_rxnfc *info) +{ + const u32 l4_flag = RXH_L4_B_0_1 | RXH_L4_B_2_3; + + info->data = RXH_IP_SRC | RXH_IP_DST; + + switch (info->flow_type) { + case TCP_V4_FLOW: + if (ndc->l4_hash & HV_TCP4_L4HASH) + info->data |= l4_flag; + + break; + + case TCP_V6_FLOW: + if (ndc->l4_hash & HV_TCP6_L4HASH) + info->data |= l4_flag; + + break; + + case UDP_V4_FLOW: + if (ndc->l4_hash & HV_UDP4_L4HASH) + info->data |= l4_flag; + + break; + + case UDP_V6_FLOW: + if (ndc->l4_hash & HV_UDP6_L4HASH) + info->data |= l4_flag; + + break; + + 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 = rtnl_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(ndc, info); + } + return -EOPNOTSUPP; +} + +static int netvsc_set_rss_hash_opts(struct net_device_context *ndc, + struct ethtool_rxnfc *info) +{ + if (info->data == (RXH_IP_SRC | RXH_IP_DST | + RXH_L4_B_0_1 | RXH_L4_B_2_3)) { + switch (info->flow_type) { + case TCP_V4_FLOW: + ndc->l4_hash |= HV_TCP4_L4HASH; + break; + + case TCP_V6_FLOW: + ndc->l4_hash |= HV_TCP6_L4HASH; + break; + + case UDP_V4_FLOW: + ndc->l4_hash |= HV_UDP4_L4HASH; + break; + + case UDP_V6_FLOW: + ndc->l4_hash |= HV_UDP6_L4HASH; + break; + + default: + return -EOPNOTSUPP; + } + + return 0; + } + + if (info->data == (RXH_IP_SRC | RXH_IP_DST)) { + switch (info->flow_type) { + case TCP_V4_FLOW: + ndc->l4_hash &= ~HV_TCP4_L4HASH; + break; + + case TCP_V6_FLOW: + ndc->l4_hash &= ~HV_TCP6_L4HASH; + break; + + case UDP_V4_FLOW: + ndc->l4_hash &= ~HV_UDP4_L4HASH; + break; + + case UDP_V6_FLOW: + ndc->l4_hash &= ~HV_UDP6_L4HASH; + break; + + default: + return -EOPNOTSUPP; + } + + return 0; + } + + return -EOPNOTSUPP; +} + +static int +netvsc_set_rxnfc(struct net_device *ndev, struct ethtool_rxnfc *info) +{ + struct net_device_context *ndc = netdev_priv(ndev); + + if (info->cmd == ETHTOOL_SRXFH) + return netvsc_set_rss_hash_opts(ndc, info); + + return -EOPNOTSUPP; +} + +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 = rtnl_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] = ndc->rx_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] >= ndev->num_chn) + return -EINVAL; + + for (i = 0; i < ITAB_NUM; i++) + ndc->rx_table[i] = indir[i]; + } + + if (!key) { + if (!indir) + return 0; + + key = rndis_dev->rss_key; + } + + return rndis_filter_set_rss_param(rndis_dev, key); +} + +/* Hyper-V RNDIS protocol does not have ring in the HW sense. + * It does have pre-allocated receive area which is divided into sections. + */ +static void __netvsc_get_ringparam(struct netvsc_device *nvdev, + struct ethtool_ringparam *ring) +{ + u32 max_buf_size; + + ring->rx_pending = nvdev->recv_section_cnt; + ring->tx_pending = nvdev->send_section_cnt; + + if (nvdev->nvsp_version <= NVSP_PROTOCOL_VERSION_2) + max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY; + else + max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; + + ring->rx_max_pending = max_buf_size / nvdev->recv_section_size; + ring->tx_max_pending = NETVSC_SEND_BUFFER_SIZE + / nvdev->send_section_size; +} + +static void netvsc_get_ringparam(struct net_device *ndev, + struct ethtool_ringparam *ring, + struct kernel_ethtool_ringparam *kernel_ring, + struct netlink_ext_ack *extack) +{ + struct net_device_context *ndevctx = netdev_priv(ndev); + struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev); + + if (!nvdev) + return; + + __netvsc_get_ringparam(nvdev, ring); +} + +static int netvsc_set_ringparam(struct net_device *ndev, + struct ethtool_ringparam *ring, + struct kernel_ethtool_ringparam *kernel_ring, + struct netlink_ext_ack *extack) +{ + struct net_device_context *ndevctx = netdev_priv(ndev); + struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev); + struct netvsc_device_info *device_info; + struct ethtool_ringparam orig; + u32 new_tx, new_rx; + int ret = 0; + + if (!nvdev || nvdev->destroy) + return -ENODEV; + + memset(&orig, 0, sizeof(orig)); + __netvsc_get_ringparam(nvdev, &orig); + + new_tx = clamp_t(u32, ring->tx_pending, + NETVSC_MIN_TX_SECTIONS, orig.tx_max_pending); + new_rx = clamp_t(u32, ring->rx_pending, + NETVSC_MIN_RX_SECTIONS, orig.rx_max_pending); + + if (new_tx == orig.tx_pending && + new_rx == orig.rx_pending) + return 0; /* no change */ + + device_info = netvsc_devinfo_get(nvdev); + + if (!device_info) + return -ENOMEM; + + device_info->send_sections = new_tx; + device_info->recv_sections = new_rx; + + ret = netvsc_detach(ndev, nvdev); + if (ret) + goto out; + + ret = netvsc_attach(ndev, device_info); + if (ret) { + device_info->send_sections = orig.tx_pending; + device_info->recv_sections = orig.rx_pending; + + if (netvsc_attach(ndev, device_info)) + netdev_err(ndev, "restoring ringparam failed"); + } + +out: + netvsc_devinfo_put(device_info); + return ret; +} + +static netdev_features_t netvsc_fix_features(struct net_device *ndev, + netdev_features_t features) +{ + struct net_device_context *ndevctx = netdev_priv(ndev); + struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev); + + if (!nvdev || nvdev->destroy) + return features; + + if ((features & NETIF_F_LRO) && netvsc_xdp_get(nvdev)) { + features ^= NETIF_F_LRO; + netdev_info(ndev, "Skip LRO - unsupported with XDP\n"); + } + + return features; +} + +static int netvsc_set_features(struct net_device *ndev, + netdev_features_t features) +{ + netdev_features_t change = features ^ ndev->features; + struct net_device_context *ndevctx = netdev_priv(ndev); + struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev); + struct net_device *vf_netdev = rtnl_dereference(ndevctx->vf_netdev); + struct ndis_offload_params offloads; + int ret = 0; + + if (!nvdev || nvdev->destroy) + return -ENODEV; + + if (!(change & NETIF_F_LRO)) + goto syncvf; + + memset(&offloads, 0, sizeof(struct ndis_offload_params)); + + if (features & NETIF_F_LRO) { + offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED; + offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED; + } else { + offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED; + offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED; + } + + ret = rndis_filter_set_offload_params(ndev, nvdev, &offloads); + + if (ret) { + features ^= NETIF_F_LRO; + ndev->features = features; + } + +syncvf: + if (!vf_netdev) + return ret; + + vf_netdev->wanted_features = features; + netdev_update_features(vf_netdev); + + return ret; +} + +static int netvsc_get_regs_len(struct net_device *netdev) +{ + return VRSS_SEND_TAB_SIZE * sizeof(u32); +} + +static void netvsc_get_regs(struct net_device *netdev, + struct ethtool_regs *regs, void *p) +{ + struct net_device_context *ndc = netdev_priv(netdev); + u32 *regs_buff = p; + + /* increase the version, if buffer format is changed. */ + regs->version = 1; + + memcpy(regs_buff, ndc->tx_table, VRSS_SEND_TAB_SIZE * sizeof(u32)); +} + +static u32 netvsc_get_msglevel(struct net_device *ndev) +{ + struct net_device_context *ndev_ctx = netdev_priv(ndev); + + return ndev_ctx->msg_enable; +} + +static void netvsc_set_msglevel(struct net_device *ndev, u32 val) +{ + struct net_device_context *ndev_ctx = netdev_priv(ndev); + + ndev_ctx->msg_enable = val; +} + +static const struct ethtool_ops ethtool_ops = { + .get_drvinfo = netvsc_get_drvinfo, + .get_regs_len = netvsc_get_regs_len, + .get_regs = netvsc_get_regs, + .get_msglevel = netvsc_get_msglevel, + .set_msglevel = netvsc_set_msglevel, + .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, + .set_rxnfc = netvsc_set_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, + .get_ringparam = netvsc_get_ringparam, + .set_ringparam = netvsc_set_ringparam, +}; + +static const struct net_device_ops device_ops = { + .ndo_open = netvsc_open, + .ndo_stop = netvsc_close, + .ndo_start_xmit = netvsc_start_xmit, + .ndo_change_rx_flags = netvsc_change_rx_flags, + .ndo_set_rx_mode = netvsc_set_rx_mode, + .ndo_fix_features = netvsc_fix_features, + .ndo_set_features = netvsc_set_features, + .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, + .ndo_bpf = netvsc_bpf, + .ndo_xdp_xmit = netvsc_ndoxdp_xmit, +}; + +/* + * 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); + unsigned long flags, next_reconfig, delay; + struct netvsc_reconfig *event = NULL; + struct netvsc_device *net_device; + struct rndis_device *rdev; + bool reschedule = false; + + /* if changes are happening, comeback later */ + if (!rtnl_trylock()) { + schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT); + return; + } + + 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; + netif_carrier_on(net); + netvsc_tx_enable(net_device, net); + } else { + __netdev_notify_peers(net); + } + kfree(event); + break; + case RNDIS_STATUS_MEDIA_DISCONNECT: + if (!rdev->link_state) { + rdev->link_state = true; + netif_carrier_off(net); + netvsc_tx_disable(net_device, 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); + netvsc_tx_disable(net_device, 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(); + + /* 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_byref(struct net_device *vf_netdev) +{ + struct net_device_context *net_device_ctx; + struct net_device *dev; + + dev = netdev_master_upper_dev_get(vf_netdev); + if (!dev || dev->netdev_ops != &device_ops) + return NULL; /* not a netvsc device */ + + net_device_ctx = netdev_priv(dev); + if (!rtnl_dereference(net_device_ctx->nvdev)) + return NULL; /* device is removed */ + + return dev; +} + +/* Called when VF is injecting data into network stack. + * Change the associated network device from VF to netvsc. + * note: already called with rcu_read_lock + */ +static rx_handler_result_t netvsc_vf_handle_frame(struct sk_buff **pskb) +{ + struct sk_buff *skb = *pskb; + struct net_device *ndev = rcu_dereference(skb->dev->rx_handler_data); + struct net_device_context *ndev_ctx = netdev_priv(ndev); + struct netvsc_vf_pcpu_stats *pcpu_stats + = this_cpu_ptr(ndev_ctx->vf_stats); + + skb = skb_share_check(skb, GFP_ATOMIC); + if (unlikely(!skb)) + return RX_HANDLER_CONSUMED; + + *pskb = skb; + + skb->dev = ndev; + + u64_stats_update_begin(&pcpu_stats->syncp); + pcpu_stats->rx_packets++; + pcpu_stats->rx_bytes += skb->len; + u64_stats_update_end(&pcpu_stats->syncp); + + return RX_HANDLER_ANOTHER; +} + +static int netvsc_vf_join(struct net_device *vf_netdev, + struct net_device *ndev) +{ + struct net_device_context *ndev_ctx = netdev_priv(ndev); + int ret; + + ret = netdev_rx_handler_register(vf_netdev, + netvsc_vf_handle_frame, ndev); + if (ret != 0) { + netdev_err(vf_netdev, + "can not register netvsc VF receive handler (err = %d)\n", + ret); + goto rx_handler_failed; + } + + ret = netdev_master_upper_dev_link(vf_netdev, ndev, + NULL, NULL, NULL); + if (ret != 0) { + netdev_err(vf_netdev, + "can not set master device %s (err = %d)\n", + ndev->name, ret); + goto upper_link_failed; + } + + schedule_delayed_work(&ndev_ctx->vf_takeover, VF_TAKEOVER_INT); + + call_netdevice_notifiers(NETDEV_JOIN, vf_netdev); + + netdev_info(vf_netdev, "joined to %s\n", ndev->name); + return 0; + +upper_link_failed: + netdev_rx_handler_unregister(vf_netdev); +rx_handler_failed: + return ret; +} + +static void __netvsc_vf_setup(struct net_device *ndev, + struct net_device *vf_netdev) +{ + int ret; + + /* Align MTU of VF with master */ + ret = dev_set_mtu(vf_netdev, ndev->mtu); + if (ret) + netdev_warn(vf_netdev, + "unable to change mtu to %u\n", ndev->mtu); + + /* set multicast etc flags on VF */ + dev_change_flags(vf_netdev, ndev->flags | IFF_SLAVE, NULL); + + /* sync address list from ndev to VF */ + netif_addr_lock_bh(ndev); + dev_uc_sync(vf_netdev, ndev); + dev_mc_sync(vf_netdev, ndev); + netif_addr_unlock_bh(ndev); + + if (netif_running(ndev)) { + ret = dev_open(vf_netdev, NULL); + if (ret) + netdev_warn(vf_netdev, + "unable to open: %d\n", ret); + } +} + +/* Setup VF as slave of the synthetic device. + * Runs in workqueue to avoid recursion in netlink callbacks. + */ +static void netvsc_vf_setup(struct work_struct *w) +{ + struct net_device_context *ndev_ctx + = container_of(w, struct net_device_context, vf_takeover.work); + struct net_device *ndev = hv_get_drvdata(ndev_ctx->device_ctx); + struct net_device *vf_netdev; + + if (!rtnl_trylock()) { + schedule_delayed_work(&ndev_ctx->vf_takeover, 0); + return; + } + + vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev); + if (vf_netdev) + __netvsc_vf_setup(ndev, vf_netdev); + + rtnl_unlock(); +} + +/* Find netvsc by VF serial number. + * The PCI hyperv controller records the serial number as the slot kobj name. + */ +static struct net_device *get_netvsc_byslot(const struct net_device *vf_netdev) +{ + struct device *parent = vf_netdev->dev.parent; + struct net_device_context *ndev_ctx; + struct net_device *ndev; + struct pci_dev *pdev; + u32 serial; + + if (!parent || !dev_is_pci(parent)) + return NULL; /* not a PCI device */ + + pdev = to_pci_dev(parent); + if (!pdev->slot) { + netdev_notice(vf_netdev, "no PCI slot information\n"); + return NULL; + } + + if (kstrtou32(pci_slot_name(pdev->slot), 10, &serial)) { + netdev_notice(vf_netdev, "Invalid vf serial:%s\n", + pci_slot_name(pdev->slot)); + return NULL; + } + + list_for_each_entry(ndev_ctx, &netvsc_dev_list, list) { + if (!ndev_ctx->vf_alloc) + continue; + + if (ndev_ctx->vf_serial != serial) + continue; + + ndev = hv_get_drvdata(ndev_ctx->device_ctx); + if (ndev->addr_len != vf_netdev->addr_len || + memcmp(ndev->perm_addr, vf_netdev->perm_addr, + ndev->addr_len) != 0) + continue; + + return ndev; + + } + + /* Fallback path to check synthetic vf with help of mac addr. + * Because this function can be called before vf_netdev is + * initialized (NETDEV_POST_INIT) when its perm_addr has not been copied + * from dev_addr, also try to match to its dev_addr. + * Note: On Hyper-V and Azure, it's not possible to set a MAC address + * on a VF that matches to the MAC of a unrelated NETVSC device. + */ + list_for_each_entry(ndev_ctx, &netvsc_dev_list, list) { + ndev = hv_get_drvdata(ndev_ctx->device_ctx); + if (ether_addr_equal(vf_netdev->perm_addr, ndev->perm_addr) || + ether_addr_equal(vf_netdev->dev_addr, ndev->perm_addr)) + return ndev; + } + + netdev_notice(vf_netdev, + "no netdev found for vf serial:%u\n", serial); + return NULL; +} + +static int netvsc_prepare_bonding(struct net_device *vf_netdev) +{ + struct net_device *ndev; + + ndev = get_netvsc_byslot(vf_netdev); + if (!ndev) + return NOTIFY_DONE; + + /* set slave flag before open to prevent IPv6 addrconf */ + vf_netdev->flags |= IFF_SLAVE; + return NOTIFY_DONE; +} + +static int netvsc_register_vf(struct net_device *vf_netdev) +{ + struct net_device_context *net_device_ctx; + struct netvsc_device *netvsc_dev; + struct bpf_prog *prog; + struct net_device *ndev; + int ret; + + if (vf_netdev->addr_len != ETH_ALEN) + return NOTIFY_DONE; + + ndev = get_netvsc_byslot(vf_netdev); + 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; + + /* if synthetic interface is a different namespace, + * then move the VF to that namespace; join will be + * done again in that context. + */ + if (!net_eq(dev_net(ndev), dev_net(vf_netdev))) { + ret = dev_change_net_namespace(vf_netdev, + dev_net(ndev), "eth%d"); + if (ret) + netdev_err(vf_netdev, + "could not move to same namespace as %s: %d\n", + ndev->name, ret); + else + netdev_info(vf_netdev, + "VF moved to namespace with: %s\n", + ndev->name); + return NOTIFY_DONE; + } + + netdev_info(ndev, "VF registering: %s\n", vf_netdev->name); + + if (netvsc_vf_join(vf_netdev, ndev) != 0) + return NOTIFY_DONE; + + dev_hold(vf_netdev); + rcu_assign_pointer(net_device_ctx->vf_netdev, vf_netdev); + + if (ndev->needed_headroom < vf_netdev->needed_headroom) + ndev->needed_headroom = vf_netdev->needed_headroom; + + vf_netdev->wanted_features = ndev->features; + netdev_update_features(vf_netdev); + + prog = netvsc_xdp_get(netvsc_dev); + netvsc_vf_setxdp(vf_netdev, prog); + + return NOTIFY_OK; +} + +/* Change the data path when VF UP/DOWN/CHANGE are detected. + * + * Typically a UP or DOWN event is followed by a CHANGE event, so + * net_device_ctx->data_path_is_vf is used to cache the current data path + * to avoid the duplicate call of netvsc_switch_datapath() and the duplicate + * message. + * + * During hibernation, if a VF NIC driver (e.g. mlx5) preserves the network + * interface, there is only the CHANGE event and no UP or DOWN event. + */ +static int netvsc_vf_changed(struct net_device *vf_netdev, unsigned long event) +{ + struct net_device_context *net_device_ctx; + struct netvsc_device *netvsc_dev; + struct net_device *ndev; + bool vf_is_up = false; + int ret; + + if (event != NETDEV_GOING_DOWN) + vf_is_up = netif_running(vf_netdev); + + 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); + if (!netvsc_dev) + return NOTIFY_DONE; + + if (net_device_ctx->data_path_is_vf == vf_is_up) + return NOTIFY_OK; + + if (vf_is_up && !net_device_ctx->vf_alloc) { + netdev_info(ndev, "Waiting for the VF association from host\n"); + wait_for_completion(&net_device_ctx->vf_add); + } + + ret = netvsc_switch_datapath(ndev, vf_is_up); + + if (ret) { + netdev_err(ndev, + "Data path failed to switch %s VF: %s, err: %d\n", + vf_is_up ? "to" : "from", vf_netdev->name, ret); + return NOTIFY_DONE; + } else { + netdev_info(ndev, "Data path switched %s VF: %s\n", + vf_is_up ? "to" : "from", vf_netdev->name); + } + + 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); + cancel_delayed_work_sync(&net_device_ctx->vf_takeover); + + netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name); + + netvsc_vf_setxdp(vf_netdev, NULL); + + reinit_completion(&net_device_ctx->vf_add); + netdev_rx_handler_unregister(vf_netdev); + netdev_upper_dev_unlink(vf_netdev, ndev); + RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL); + dev_put(vf_netdev); + + ndev->needed_headroom = RNDIS_AND_PPI_SIZE; + + 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 = NULL; + struct netvsc_device *nvdev; + int ret = -ENOMEM; + + net = alloc_etherdev_mq(sizeof(struct net_device_context), + VRSS_CHANNEL_MAX); + if (!net) + goto no_net; + + 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); + + init_completion(&net_device_ctx->vf_add); + spin_lock_init(&net_device_ctx->lock); + INIT_LIST_HEAD(&net_device_ctx->reconfig_events); + INIT_DELAYED_WORK(&net_device_ctx->vf_takeover, netvsc_vf_setup); + + net_device_ctx->vf_stats + = netdev_alloc_pcpu_stats(struct netvsc_vf_pcpu_stats); + if (!net_device_ctx->vf_stats) + goto no_stats; + + net->netdev_ops = &device_ops; + net->ethtool_ops = ðtool_ops; + SET_NETDEV_DEV(net, &dev->device); + dma_set_min_align_mask(&dev->device, HV_HYP_PAGE_SIZE - 1); + + /* We always need headroom for rndis header */ + net->needed_headroom = RNDIS_AND_PPI_SIZE; + + /* Initialize the number of queues to be 1, we may change it if more + * channels are offered later. + */ + netif_set_real_num_tx_queues(net, 1); + netif_set_real_num_rx_queues(net, 1); + + /* Notify the netvsc driver of the new device */ + device_info = netvsc_devinfo_get(NULL); + + if (!device_info) { + ret = -ENOMEM; + goto devinfo_failed; + } + + /* We must get rtnl lock before scheduling nvdev->subchan_work, + * otherwise netvsc_subchan_work() can get rtnl lock first and wait + * all subchannels to show up, but that may not happen because + * netvsc_probe() can't get rtnl lock and as a result vmbus_onoffer() + * -> ... -> device_add() -> ... -> __device_attach() can't get + * the device lock, so all the subchannels can't be processed -- + * finally netvsc_subchan_work() hangs forever. + * + * The rtnl lock also needs to be held before rndis_filter_device_add() + * which advertises nvsp_2_vsc_capability / sriov bit, and triggers + * VF NIC offering and registering. If VF NIC finished register_netdev() + * earlier it may cause name based config failure. + */ + rtnl_lock(); + + nvdev = rndis_filter_device_add(dev, device_info); + if (IS_ERR(nvdev)) { + ret = PTR_ERR(nvdev); + netdev_err(net, "unable to add netvsc device (ret %d)\n", ret); + goto rndis_failed; + } + + eth_hw_addr_set(net, device_info->mac_adr); + + if (nvdev->num_chn > 1) + schedule_work(&nvdev->subchan_work); + + /* hw_features computed in rndis_netdev_set_hwcaps() */ + net->features = net->hw_features | + NETIF_F_HIGHDMA | NETIF_F_HW_VLAN_CTAG_TX | + NETIF_F_HW_VLAN_CTAG_RX; + net->vlan_features = net->features; + + netdev_lockdep_set_classes(net); + + /* 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; + + nvdev->tx_disable = false; + + ret = register_netdevice(net); + if (ret != 0) { + pr_err("Unable to register netdev.\n"); + goto register_failed; + } + + list_add(&net_device_ctx->list, &netvsc_dev_list); + rtnl_unlock(); + + netvsc_devinfo_put(device_info); + return 0; + +register_failed: + rndis_filter_device_remove(dev, nvdev); +rndis_failed: + rtnl_unlock(); + netvsc_devinfo_put(device_info); +devinfo_failed: + free_percpu(net_device_ctx->vf_stats); +no_stats: + hv_set_drvdata(dev, NULL); + free_netdev(net); +no_net: + return ret; +} + +static int netvsc_remove(struct hv_device *dev) +{ + struct net_device_context *ndev_ctx; + struct net_device *vf_netdev, *net; + struct netvsc_device *nvdev; + + 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); + + cancel_delayed_work_sync(&ndev_ctx->dwork); + + rtnl_lock(); + nvdev = rtnl_dereference(ndev_ctx->nvdev); + if (nvdev) { + cancel_work_sync(&nvdev->subchan_work); + netvsc_xdp_set(net, NULL, NULL, nvdev); + } + + /* + * Call to the vsc driver to let it know that the device is being + * removed. Also blocks mtu and channel changes. + */ + vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev); + if (vf_netdev) + netvsc_unregister_vf(vf_netdev); + + if (nvdev) + rndis_filter_device_remove(dev, nvdev); + + unregister_netdevice(net); + list_del(&ndev_ctx->list); + + rtnl_unlock(); + + hv_set_drvdata(dev, NULL); + + free_percpu(ndev_ctx->vf_stats); + free_netdev(net); + return 0; +} + +static int netvsc_suspend(struct hv_device *dev) +{ + struct net_device_context *ndev_ctx; + struct netvsc_device *nvdev; + struct net_device *net; + int ret; + + net = hv_get_drvdata(dev); + + ndev_ctx = netdev_priv(net); + cancel_delayed_work_sync(&ndev_ctx->dwork); + + rtnl_lock(); + + nvdev = rtnl_dereference(ndev_ctx->nvdev); + if (nvdev == NULL) { + ret = -ENODEV; + goto out; + } + + /* Save the current config info */ + ndev_ctx->saved_netvsc_dev_info = netvsc_devinfo_get(nvdev); + if (!ndev_ctx->saved_netvsc_dev_info) { + ret = -ENOMEM; + goto out; + } + ret = netvsc_detach(net, nvdev); +out: + rtnl_unlock(); + + return ret; +} + +static int netvsc_resume(struct hv_device *dev) +{ + struct net_device *net = hv_get_drvdata(dev); + struct net_device_context *net_device_ctx; + struct netvsc_device_info *device_info; + int ret; + + rtnl_lock(); + + net_device_ctx = netdev_priv(net); + + /* Reset the data path to the netvsc NIC before re-opening the vmbus + * channel. Later netvsc_netdev_event() will switch the data path to + * the VF upon the UP or CHANGE event. + */ + net_device_ctx->data_path_is_vf = false; + device_info = net_device_ctx->saved_netvsc_dev_info; + + ret = netvsc_attach(net, device_info); + + netvsc_devinfo_put(device_info); + net_device_ctx->saved_netvsc_dev_info = NULL; + + rtnl_unlock(); + + return ret; +} +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, + .suspend = netvsc_suspend, + .resume = netvsc_resume, + .driver = { + .probe_type = PROBE_FORCE_SYNCHRONOUS, + }, +}; + +/* + * 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 (netif_is_bond_master(event_dev)) + return NOTIFY_DONE; + + switch (event) { + case NETDEV_POST_INIT: + return netvsc_prepare_bonding(event_dev); + case NETDEV_REGISTER: + return netvsc_register_vf(event_dev); + case NETDEV_UNREGISTER: + return netvsc_unregister_vf(event_dev); + case NETDEV_UP: + case NETDEV_DOWN: + case NETDEV_CHANGE: + case NETDEV_GOING_DOWN: + return netvsc_vf_changed(event_dev, event); + 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 %u (min allowed)\n", + ring_size); + } + netvsc_ring_bytes = VMBUS_RING_SIZE(ring_size * 4096); + + register_netdevice_notifier(&netvsc_netdev_notifier); + + ret = vmbus_driver_register(&netvsc_drv); + if (ret) + goto err_vmbus_reg; + + return 0; + +err_vmbus_reg: + unregister_netdevice_notifier(&netvsc_netdev_notifier); + return ret; +} + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Microsoft Hyper-V network driver"); + +module_init(netvsc_drv_init); +module_exit(netvsc_drv_exit); |