brintos / linux-shallow public Read only

1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2009, Microsoft Corporation.4 *5 * Authors:6 *   Haiyang Zhang <haiyangz@microsoft.com>7 *   Hank Janssen  <hjanssen@microsoft.com>8 */9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt10 11#include <linux/init.h>12#include <linux/atomic.h>13#include <linux/ethtool.h>14#include <linux/module.h>15#include <linux/highmem.h>16#include <linux/device.h>17#include <linux/io.h>18#include <linux/delay.h>19#include <linux/netdevice.h>20#include <linux/inetdevice.h>21#include <linux/etherdevice.h>22#include <linux/pci.h>23#include <linux/skbuff.h>24#include <linux/if_vlan.h>25#include <linux/in.h>26#include <linux/slab.h>27#include <linux/rtnetlink.h>28#include <linux/netpoll.h>29#include <linux/bpf.h>30 31#include <net/arp.h>32#include <net/route.h>33#include <net/sock.h>34#include <net/pkt_sched.h>35#include <net/checksum.h>36#include <net/ip6_checksum.h>37 38#include "hyperv_net.h"39 40#define RING_SIZE_MIN	6441 42#define LINKCHANGE_INT (2 * HZ)43#define VF_TAKEOVER_INT (HZ / 10)44 45/* Macros to define the context of vf registration */46#define VF_REG_IN_PROBE		147#define VF_REG_IN_NOTIFIER	248 49static unsigned int ring_size __ro_after_init = 128;50module_param(ring_size, uint, 0444);51MODULE_PARM_DESC(ring_size, "Ring buffer size (# of 4K pages)");52unsigned int netvsc_ring_bytes __ro_after_init;53 54static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |55				NETIF_MSG_LINK | NETIF_MSG_IFUP |56				NETIF_MSG_IFDOWN | NETIF_MSG_RX_ERR |57				NETIF_MSG_TX_ERR;58 59static int debug = -1;60module_param(debug, int, 0444);61MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");62 63static LIST_HEAD(netvsc_dev_list);64 65static void netvsc_change_rx_flags(struct net_device *net, int change)66{67	struct net_device_context *ndev_ctx = netdev_priv(net);68	struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);69	int inc;70 71	if (!vf_netdev)72		return;73 74	if (change & IFF_PROMISC) {75		inc = (net->flags & IFF_PROMISC) ? 1 : -1;76		dev_set_promiscuity(vf_netdev, inc);77	}78 79	if (change & IFF_ALLMULTI) {80		inc = (net->flags & IFF_ALLMULTI) ? 1 : -1;81		dev_set_allmulti(vf_netdev, inc);82	}83}84 85static void netvsc_set_rx_mode(struct net_device *net)86{87	struct net_device_context *ndev_ctx = netdev_priv(net);88	struct net_device *vf_netdev;89	struct netvsc_device *nvdev;90 91	rcu_read_lock();92	vf_netdev = rcu_dereference(ndev_ctx->vf_netdev);93	if (vf_netdev) {94		dev_uc_sync(vf_netdev, net);95		dev_mc_sync(vf_netdev, net);96	}97 98	nvdev = rcu_dereference(ndev_ctx->nvdev);99	if (nvdev)100		rndis_filter_update(nvdev);101	rcu_read_unlock();102}103 104static void netvsc_tx_enable(struct netvsc_device *nvscdev,105			     struct net_device *ndev)106{107	nvscdev->tx_disable = false;108	virt_wmb(); /* ensure queue wake up mechanism is on */109 110	netif_tx_wake_all_queues(ndev);111}112 113static int netvsc_open(struct net_device *net)114{115	struct net_device_context *ndev_ctx = netdev_priv(net);116	struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);117	struct netvsc_device *nvdev = rtnl_dereference(ndev_ctx->nvdev);118	struct rndis_device *rdev;119	int ret = 0;120 121	netif_carrier_off(net);122 123	/* Open up the device */124	ret = rndis_filter_open(nvdev);125	if (ret != 0) {126		netdev_err(net, "unable to open device (ret %d).\n", ret);127		return ret;128	}129 130	rdev = nvdev->extension;131	if (!rdev->link_state) {132		netif_carrier_on(net);133		netvsc_tx_enable(nvdev, net);134	}135 136	if (vf_netdev) {137		/* Setting synthetic device up transparently sets138		 * slave as up. If open fails, then slave will be139		 * still be offline (and not used).140		 */141		ret = dev_open(vf_netdev, NULL);142		if (ret)143			netdev_warn(net,144				    "unable to open slave: %s: %d\n",145				    vf_netdev->name, ret);146	}147	return 0;148}149 150static int netvsc_wait_until_empty(struct netvsc_device *nvdev)151{152	unsigned int retry = 0;153	int i;154 155	/* Ensure pending bytes in ring are read */156	for (;;) {157		u32 aread = 0;158 159		for (i = 0; i < nvdev->num_chn; i++) {160			struct vmbus_channel *chn161				= nvdev->chan_table[i].channel;162 163			if (!chn)164				continue;165 166			/* make sure receive not running now */167			napi_synchronize(&nvdev->chan_table[i].napi);168 169			aread = hv_get_bytes_to_read(&chn->inbound);170			if (aread)171				break;172 173			aread = hv_get_bytes_to_read(&chn->outbound);174			if (aread)175				break;176		}177 178		if (aread == 0)179			return 0;180 181		if (++retry > RETRY_MAX)182			return -ETIMEDOUT;183 184		usleep_range(RETRY_US_LO, RETRY_US_HI);185	}186}187 188static void netvsc_tx_disable(struct netvsc_device *nvscdev,189			      struct net_device *ndev)190{191	if (nvscdev) {192		nvscdev->tx_disable = true;193		virt_wmb(); /* ensure txq will not wake up after stop */194	}195 196	netif_tx_disable(ndev);197}198 199static int netvsc_close(struct net_device *net)200{201	struct net_device_context *net_device_ctx = netdev_priv(net);202	struct net_device *vf_netdev203		= rtnl_dereference(net_device_ctx->vf_netdev);204	struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);205	int ret;206 207	netvsc_tx_disable(nvdev, net);208 209	/* No need to close rndis filter if it is removed already */210	if (!nvdev)211		return 0;212 213	ret = rndis_filter_close(nvdev);214	if (ret != 0) {215		netdev_err(net, "unable to close device (ret %d).\n", ret);216		return ret;217	}218 219	ret = netvsc_wait_until_empty(nvdev);220	if (ret)221		netdev_err(net, "Ring buffer not empty after closing rndis\n");222 223	if (vf_netdev)224		dev_close(vf_netdev);225 226	return ret;227}228 229static inline void *init_ppi_data(struct rndis_message *msg,230				  u32 ppi_size, u32 pkt_type)231{232	struct rndis_packet *rndis_pkt = &msg->msg.pkt;233	struct rndis_per_packet_info *ppi;234 235	rndis_pkt->data_offset += ppi_size;236	ppi = (void *)rndis_pkt + rndis_pkt->per_pkt_info_offset237		+ rndis_pkt->per_pkt_info_len;238 239	ppi->size = ppi_size;240	ppi->type = pkt_type;241	ppi->internal = 0;242	ppi->ppi_offset = sizeof(struct rndis_per_packet_info);243 244	rndis_pkt->per_pkt_info_len += ppi_size;245 246	return ppi + 1;247}248 249static inline int netvsc_get_tx_queue(struct net_device *ndev,250				      struct sk_buff *skb, int old_idx)251{252	const struct net_device_context *ndc = netdev_priv(ndev);253	struct sock *sk = skb->sk;254	int q_idx;255 256	q_idx = ndc->tx_table[netvsc_get_hash(skb, ndc) &257			      (VRSS_SEND_TAB_SIZE - 1)];258 259	/* If queue index changed record the new value */260	if (q_idx != old_idx &&261	    sk && sk_fullsock(sk) && rcu_access_pointer(sk->sk_dst_cache))262		sk_tx_queue_set(sk, q_idx);263 264	return q_idx;265}266 267/*268 * Select queue for transmit.269 *270 * If a valid queue has already been assigned, then use that.271 * Otherwise compute tx queue based on hash and the send table.272 *273 * This is basically similar to default (netdev_pick_tx) with the added step274 * of using the host send_table when no other queue has been assigned.275 *276 * TODO support XPS - but get_xps_queue not exported277 */278static u16 netvsc_pick_tx(struct net_device *ndev, struct sk_buff *skb)279{280	int q_idx = sk_tx_queue_get(skb->sk);281 282	if (q_idx < 0 || skb->ooo_okay || q_idx >= ndev->real_num_tx_queues) {283		/* If forwarding a packet, we use the recorded queue when284		 * available for better cache locality.285		 */286		if (skb_rx_queue_recorded(skb))287			q_idx = skb_get_rx_queue(skb);288		else289			q_idx = netvsc_get_tx_queue(ndev, skb, q_idx);290	}291 292	return q_idx;293}294 295static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,296			       struct net_device *sb_dev)297{298	struct net_device_context *ndc = netdev_priv(ndev);299	struct net_device *vf_netdev;300	u16 txq;301 302	rcu_read_lock();303	vf_netdev = rcu_dereference(ndc->vf_netdev);304	if (vf_netdev) {305		const struct net_device_ops *vf_ops = vf_netdev->netdev_ops;306 307		if (vf_ops->ndo_select_queue)308			txq = vf_ops->ndo_select_queue(vf_netdev, skb, sb_dev);309		else310			txq = netdev_pick_tx(vf_netdev, skb, NULL);311 312		/* Record the queue selected by VF so that it can be313		 * used for common case where VF has more queues than314		 * the synthetic device.315		 */316		qdisc_skb_cb(skb)->slave_dev_queue_mapping = txq;317	} else {318		txq = netvsc_pick_tx(ndev, skb);319	}320	rcu_read_unlock();321 322	while (txq >= ndev->real_num_tx_queues)323		txq -= ndev->real_num_tx_queues;324 325	return txq;326}327 328static u32 fill_pg_buf(unsigned long hvpfn, u32 offset, u32 len,329		       struct hv_page_buffer *pb)330{331	int j = 0;332 333	hvpfn += offset >> HV_HYP_PAGE_SHIFT;334	offset = offset & ~HV_HYP_PAGE_MASK;335 336	while (len > 0) {337		unsigned long bytes;338 339		bytes = HV_HYP_PAGE_SIZE - offset;340		if (bytes > len)341			bytes = len;342		pb[j].pfn = hvpfn;343		pb[j].offset = offset;344		pb[j].len = bytes;345 346		offset += bytes;347		len -= bytes;348 349		if (offset == HV_HYP_PAGE_SIZE && len) {350			hvpfn++;351			offset = 0;352			j++;353		}354	}355 356	return j + 1;357}358 359static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,360			   struct hv_netvsc_packet *packet,361			   struct hv_page_buffer *pb)362{363	u32 slots_used = 0;364	char *data = skb->data;365	int frags = skb_shinfo(skb)->nr_frags;366	int i;367 368	/* The packet is laid out thus:369	 * 1. hdr: RNDIS header and PPI370	 * 2. skb linear data371	 * 3. skb fragment data372	 */373	slots_used += fill_pg_buf(virt_to_hvpfn(hdr),374				  offset_in_hvpage(hdr),375				  len,376				  &pb[slots_used]);377 378	packet->rmsg_size = len;379	packet->rmsg_pgcnt = slots_used;380 381	slots_used += fill_pg_buf(virt_to_hvpfn(data),382				  offset_in_hvpage(data),383				  skb_headlen(skb),384				  &pb[slots_used]);385 386	for (i = 0; i < frags; i++) {387		skb_frag_t *frag = skb_shinfo(skb)->frags + i;388 389		slots_used += fill_pg_buf(page_to_hvpfn(skb_frag_page(frag)),390					  skb_frag_off(frag),391					  skb_frag_size(frag),392					  &pb[slots_used]);393	}394	return slots_used;395}396 397static int count_skb_frag_slots(struct sk_buff *skb)398{399	int i, frags = skb_shinfo(skb)->nr_frags;400	int pages = 0;401 402	for (i = 0; i < frags; i++) {403		skb_frag_t *frag = skb_shinfo(skb)->frags + i;404		unsigned long size = skb_frag_size(frag);405		unsigned long offset = skb_frag_off(frag);406 407		/* Skip unused frames from start of page */408		offset &= ~HV_HYP_PAGE_MASK;409		pages += HVPFN_UP(offset + size);410	}411	return pages;412}413 414static int netvsc_get_slots(struct sk_buff *skb)415{416	char *data = skb->data;417	unsigned int offset = offset_in_hvpage(data);418	unsigned int len = skb_headlen(skb);419	int slots;420	int frag_slots;421 422	slots = DIV_ROUND_UP(offset + len, HV_HYP_PAGE_SIZE);423	frag_slots = count_skb_frag_slots(skb);424	return slots + frag_slots;425}426 427static u32 net_checksum_info(struct sk_buff *skb)428{429	if (skb->protocol == htons(ETH_P_IP)) {430		struct iphdr *ip = ip_hdr(skb);431 432		if (ip->protocol == IPPROTO_TCP)433			return TRANSPORT_INFO_IPV4_TCP;434		else if (ip->protocol == IPPROTO_UDP)435			return TRANSPORT_INFO_IPV4_UDP;436	} else {437		struct ipv6hdr *ip6 = ipv6_hdr(skb);438 439		if (ip6->nexthdr == IPPROTO_TCP)440			return TRANSPORT_INFO_IPV6_TCP;441		else if (ip6->nexthdr == IPPROTO_UDP)442			return TRANSPORT_INFO_IPV6_UDP;443	}444 445	return TRANSPORT_INFO_NOT_IP;446}447 448/* Send skb on the slave VF device. */449static int netvsc_vf_xmit(struct net_device *net, struct net_device *vf_netdev,450			  struct sk_buff *skb)451{452	struct net_device_context *ndev_ctx = netdev_priv(net);453	unsigned int len = skb->len;454	int rc;455 456	skb->dev = vf_netdev;457	skb_record_rx_queue(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);458 459	rc = dev_queue_xmit(skb);460	if (likely(rc == NET_XMIT_SUCCESS || rc == NET_XMIT_CN)) {461		struct netvsc_vf_pcpu_stats *pcpu_stats462			= this_cpu_ptr(ndev_ctx->vf_stats);463 464		u64_stats_update_begin(&pcpu_stats->syncp);465		pcpu_stats->tx_packets++;466		pcpu_stats->tx_bytes += len;467		u64_stats_update_end(&pcpu_stats->syncp);468	} else {469		this_cpu_inc(ndev_ctx->vf_stats->tx_dropped);470	}471 472	return rc;473}474 475static int netvsc_xmit(struct sk_buff *skb, struct net_device *net, bool xdp_tx)476{477	struct net_device_context *net_device_ctx = netdev_priv(net);478	struct hv_netvsc_packet *packet = NULL;479	int ret;480	unsigned int num_data_pgs;481	struct rndis_message *rndis_msg;482	struct net_device *vf_netdev;483	u32 rndis_msg_size;484	u32 hash;485	struct hv_page_buffer pb[MAX_PAGE_BUFFER_COUNT];486 487	/* If VF is present and up then redirect packets to it.488	 * Skip the VF if it is marked down or has no carrier.489	 * If netpoll is in uses, then VF can not be used either.490	 */491	vf_netdev = rcu_dereference_bh(net_device_ctx->vf_netdev);492	if (vf_netdev && netif_running(vf_netdev) &&493	    netif_carrier_ok(vf_netdev) && !netpoll_tx_running(net) &&494	    net_device_ctx->data_path_is_vf)495		return netvsc_vf_xmit(net, vf_netdev, skb);496 497	/* We will atmost need two pages to describe the rndis498	 * header. We can only transmit MAX_PAGE_BUFFER_COUNT number499	 * of pages in a single packet. If skb is scattered around500	 * more pages we try linearizing it.501	 */502 503	num_data_pgs = netvsc_get_slots(skb) + 2;504 505	if (unlikely(num_data_pgs > MAX_PAGE_BUFFER_COUNT)) {506		++net_device_ctx->eth_stats.tx_scattered;507 508		if (skb_linearize(skb))509			goto no_memory;510 511		num_data_pgs = netvsc_get_slots(skb) + 2;512		if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {513			++net_device_ctx->eth_stats.tx_too_big;514			goto drop;515		}516	}517 518	/*519	 * Place the rndis header in the skb head room and520	 * the skb->cb will be used for hv_netvsc_packet521	 * structure.522	 */523	ret = skb_cow_head(skb, RNDIS_AND_PPI_SIZE);524	if (ret)525		goto no_memory;526 527	/* Use the skb control buffer for building up the packet */528	BUILD_BUG_ON(sizeof(struct hv_netvsc_packet) >529			sizeof_field(struct sk_buff, cb));530	packet = (struct hv_netvsc_packet *)skb->cb;531 532	packet->q_idx = skb_get_queue_mapping(skb);533 534	packet->total_data_buflen = skb->len;535	packet->total_bytes = skb->len;536	packet->total_packets = 1;537 538	rndis_msg = (struct rndis_message *)skb->head;539 540	/* Add the rndis header */541	rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;542	rndis_msg->msg_len = packet->total_data_buflen;543 544	rndis_msg->msg.pkt = (struct rndis_packet) {545		.data_offset = sizeof(struct rndis_packet),546		.data_len = packet->total_data_buflen,547		.per_pkt_info_offset = sizeof(struct rndis_packet),548	};549 550	rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);551 552	hash = skb_get_hash_raw(skb);553	if (hash != 0 && net->real_num_tx_queues > 1) {554		u32 *hash_info;555 556		rndis_msg_size += NDIS_HASH_PPI_SIZE;557		hash_info = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,558					  NBL_HASH_VALUE);559		*hash_info = hash;560	}561 562	/* When using AF_PACKET we need to drop VLAN header from563	 * the frame and update the SKB to allow the HOST OS564	 * to transmit the 802.1Q packet565	 */566	if (skb->protocol == htons(ETH_P_8021Q)) {567		u16 vlan_tci;568 569		skb_reset_mac_header(skb);570		if (eth_type_vlan(eth_hdr(skb)->h_proto)) {571			if (unlikely(__skb_vlan_pop(skb, &vlan_tci) != 0)) {572				++net_device_ctx->eth_stats.vlan_error;573				goto drop;574			}575 576			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci);577			/* Update the NDIS header pkt lengths */578			packet->total_data_buflen -= VLAN_HLEN;579			packet->total_bytes -= VLAN_HLEN;580			rndis_msg->msg_len = packet->total_data_buflen;581			rndis_msg->msg.pkt.data_len = packet->total_data_buflen;582		}583	}584 585	if (skb_vlan_tag_present(skb)) {586		struct ndis_pkt_8021q_info *vlan;587 588		rndis_msg_size += NDIS_VLAN_PPI_SIZE;589		vlan = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,590				     IEEE_8021Q_INFO);591 592		vlan->value = 0;593		vlan->vlanid = skb_vlan_tag_get_id(skb);594		vlan->cfi = skb_vlan_tag_get_cfi(skb);595		vlan->pri = skb_vlan_tag_get_prio(skb);596	}597 598	if (skb_is_gso(skb)) {599		struct ndis_tcp_lso_info *lso_info;600 601		rndis_msg_size += NDIS_LSO_PPI_SIZE;602		lso_info = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,603					 TCP_LARGESEND_PKTINFO);604 605		lso_info->value = 0;606		lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;607		if (skb->protocol == htons(ETH_P_IP)) {608			lso_info->lso_v2_transmit.ip_version =609				NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;610			ip_hdr(skb)->tot_len = 0;611			ip_hdr(skb)->check = 0;612			tcp_hdr(skb)->check =613				~csum_tcpudp_magic(ip_hdr(skb)->saddr,614						   ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);615		} else {616			lso_info->lso_v2_transmit.ip_version =617				NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;618			tcp_v6_gso_csum_prep(skb);619		}620		lso_info->lso_v2_transmit.tcp_header_offset = skb_transport_offset(skb);621		lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;622	} else if (skb->ip_summed == CHECKSUM_PARTIAL) {623		if (net_checksum_info(skb) & net_device_ctx->tx_checksum_mask) {624			struct ndis_tcp_ip_checksum_info *csum_info;625 626			rndis_msg_size += NDIS_CSUM_PPI_SIZE;627			csum_info = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,628						  TCPIP_CHKSUM_PKTINFO);629 630			csum_info->value = 0;631			csum_info->transmit.tcp_header_offset = skb_transport_offset(skb);632 633			if (skb->protocol == htons(ETH_P_IP)) {634				csum_info->transmit.is_ipv4 = 1;635 636				if (ip_hdr(skb)->protocol == IPPROTO_TCP)637					csum_info->transmit.tcp_checksum = 1;638				else639					csum_info->transmit.udp_checksum = 1;640			} else {641				csum_info->transmit.is_ipv6 = 1;642 643				if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)644					csum_info->transmit.tcp_checksum = 1;645				else646					csum_info->transmit.udp_checksum = 1;647			}648		} else {649			/* Can't do offload of this type of checksum */650			if (skb_checksum_help(skb))651				goto drop;652		}653	}654 655	/* Start filling in the page buffers with the rndis hdr */656	rndis_msg->msg_len += rndis_msg_size;657	packet->total_data_buflen = rndis_msg->msg_len;658	packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,659					       skb, packet, pb);660 661	/* timestamp packet in software */662	skb_tx_timestamp(skb);663 664	ret = netvsc_send(net, packet, rndis_msg, pb, skb, xdp_tx);665	if (likely(ret == 0))666		return NETDEV_TX_OK;667 668	if (ret == -EAGAIN) {669		++net_device_ctx->eth_stats.tx_busy;670		return NETDEV_TX_BUSY;671	}672 673	if (ret == -ENOSPC)674		++net_device_ctx->eth_stats.tx_no_space;675 676drop:677	dev_kfree_skb_any(skb);678	net->stats.tx_dropped++;679 680	return NETDEV_TX_OK;681 682no_memory:683	++net_device_ctx->eth_stats.tx_no_memory;684	goto drop;685}686 687static netdev_tx_t netvsc_start_xmit(struct sk_buff *skb,688				     struct net_device *ndev)689{690	return netvsc_xmit(skb, ndev, false);691}692 693/*694 * netvsc_linkstatus_callback - Link up/down notification695 */696void netvsc_linkstatus_callback(struct net_device *net,697				struct rndis_message *resp,698				void *data, u32 data_buflen)699{700	struct rndis_indicate_status *indicate = &resp->msg.indicate_status;701	struct net_device_context *ndev_ctx = netdev_priv(net);702	struct netvsc_reconfig *event;703	unsigned long flags;704 705	/* Ensure the packet is big enough to access its fields */706	if (resp->msg_len - RNDIS_HEADER_SIZE < sizeof(struct rndis_indicate_status)) {707		netdev_err(net, "invalid rndis_indicate_status packet, len: %u\n",708			   resp->msg_len);709		return;710	}711 712	/* Copy the RNDIS indicate status into nvchan->recv_buf */713	memcpy(indicate, data + RNDIS_HEADER_SIZE, sizeof(*indicate));714 715	/* Update the physical link speed when changing to another vSwitch */716	if (indicate->status == RNDIS_STATUS_LINK_SPEED_CHANGE) {717		u32 speed;718 719		/* Validate status_buf_offset and status_buflen.720		 *721		 * Certain (pre-Fe) implementations of Hyper-V's vSwitch didn't account722		 * for the status buffer field in resp->msg_len; perform the validation723		 * using data_buflen (>= resp->msg_len).724		 */725		if (indicate->status_buflen < sizeof(speed) ||726		    indicate->status_buf_offset < sizeof(*indicate) ||727		    data_buflen - RNDIS_HEADER_SIZE < indicate->status_buf_offset ||728		    data_buflen - RNDIS_HEADER_SIZE - indicate->status_buf_offset729				< indicate->status_buflen) {730			netdev_err(net, "invalid rndis_indicate_status packet\n");731			return;732		}733 734		speed = *(u32 *)(data + RNDIS_HEADER_SIZE + indicate->status_buf_offset) / 10000;735		ndev_ctx->speed = speed;736		return;737	}738 739	/* Handle these link change statuses below */740	if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE &&741	    indicate->status != RNDIS_STATUS_MEDIA_CONNECT &&742	    indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT)743		return;744 745	if (net->reg_state != NETREG_REGISTERED)746		return;747 748	event = kzalloc(sizeof(*event), GFP_ATOMIC);749	if (!event)750		return;751	event->event = indicate->status;752 753	spin_lock_irqsave(&ndev_ctx->lock, flags);754	list_add_tail(&event->list, &ndev_ctx->reconfig_events);755	spin_unlock_irqrestore(&ndev_ctx->lock, flags);756 757	schedule_delayed_work(&ndev_ctx->dwork, 0);758}759 760/* This function should only be called after skb_record_rx_queue() */761void netvsc_xdp_xmit(struct sk_buff *skb, struct net_device *ndev)762{763	int rc;764 765	skb->queue_mapping = skb_get_rx_queue(skb);766	__skb_push(skb, ETH_HLEN);767 768	rc = netvsc_xmit(skb, ndev, true);769 770	if (dev_xmit_complete(rc))771		return;772 773	dev_kfree_skb_any(skb);774	ndev->stats.tx_dropped++;775}776 777static void netvsc_comp_ipcsum(struct sk_buff *skb)778{779	struct iphdr *iph = (struct iphdr *)skb->data;780 781	iph->check = 0;782	iph->check = ip_fast_csum(iph, iph->ihl);783}784 785static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,786					     struct netvsc_channel *nvchan,787					     struct xdp_buff *xdp)788{789	struct napi_struct *napi = &nvchan->napi;790	const struct ndis_pkt_8021q_info *vlan = &nvchan->rsc.vlan;791	const struct ndis_tcp_ip_checksum_info *csum_info =792						&nvchan->rsc.csum_info;793	const u32 *hash_info = &nvchan->rsc.hash_info;794	u8 ppi_flags = nvchan->rsc.ppi_flags;795	struct sk_buff *skb;796	void *xbuf = xdp->data_hard_start;797	int i;798 799	if (xbuf) {800		unsigned int hdroom = xdp->data - xdp->data_hard_start;801		unsigned int xlen = xdp->data_end - xdp->data;802		unsigned int frag_size = xdp->frame_sz;803 804		skb = build_skb(xbuf, frag_size);805 806		if (!skb) {807			__free_page(virt_to_page(xbuf));808			return NULL;809		}810 811		skb_reserve(skb, hdroom);812		skb_put(skb, xlen);813		skb->dev = napi->dev;814	} else {815		skb = napi_alloc_skb(napi, nvchan->rsc.pktlen);816 817		if (!skb)818			return NULL;819 820		/* Copy to skb. This copy is needed here since the memory821		 * pointed by hv_netvsc_packet cannot be deallocated.822		 */823		for (i = 0; i < nvchan->rsc.cnt; i++)824			skb_put_data(skb, nvchan->rsc.data[i],825				     nvchan->rsc.len[i]);826	}827 828	skb->protocol = eth_type_trans(skb, net);829 830	/* skb is already created with CHECKSUM_NONE */831	skb_checksum_none_assert(skb);832 833	/* Incoming packets may have IP header checksum verified by the host.834	 * They may not have IP header checksum computed after coalescing.835	 * We compute it here if the flags are set, because on Linux, the IP836	 * checksum is always checked.837	 */838	if ((ppi_flags & NVSC_RSC_CSUM_INFO) && csum_info->receive.ip_checksum_value_invalid &&839	    csum_info->receive.ip_checksum_succeeded &&840	    skb->protocol == htons(ETH_P_IP)) {841		/* Check that there is enough space to hold the IP header. */842		if (skb_headlen(skb) < sizeof(struct iphdr)) {843			kfree_skb(skb);844			return NULL;845		}846		netvsc_comp_ipcsum(skb);847	}848 849	/* Do L4 checksum offload if enabled and present. */850	if ((ppi_flags & NVSC_RSC_CSUM_INFO) && (net->features & NETIF_F_RXCSUM)) {851		if (csum_info->receive.tcp_checksum_succeeded ||852		    csum_info->receive.udp_checksum_succeeded)853			skb->ip_summed = CHECKSUM_UNNECESSARY;854	}855 856	if ((ppi_flags & NVSC_RSC_HASH_INFO) && (net->features & NETIF_F_RXHASH))857		skb_set_hash(skb, *hash_info, PKT_HASH_TYPE_L4);858 859	if (ppi_flags & NVSC_RSC_VLAN) {860		u16 vlan_tci = vlan->vlanid | (vlan->pri << VLAN_PRIO_SHIFT) |861			(vlan->cfi ? VLAN_CFI_MASK : 0);862 863		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),864				       vlan_tci);865	}866 867	return skb;868}869 870/*871 * netvsc_recv_callback -  Callback when we receive a packet from the872 * "wire" on the specified device.873 */874int netvsc_recv_callback(struct net_device *net,875			 struct netvsc_device *net_device,876			 struct netvsc_channel *nvchan)877{878	struct net_device_context *net_device_ctx = netdev_priv(net);879	struct vmbus_channel *channel = nvchan->channel;880	u16 q_idx = channel->offermsg.offer.sub_channel_index;881	struct sk_buff *skb;882	struct netvsc_stats_rx *rx_stats = &nvchan->rx_stats;883	struct xdp_buff xdp;884	u32 act;885 886	if (net->reg_state != NETREG_REGISTERED)887		return NVSP_STAT_FAIL;888 889	act = netvsc_run_xdp(net, nvchan, &xdp);890 891	if (act == XDP_REDIRECT)892		return NVSP_STAT_SUCCESS;893 894	if (act != XDP_PASS && act != XDP_TX) {895		u64_stats_update_begin(&rx_stats->syncp);896		rx_stats->xdp_drop++;897		u64_stats_update_end(&rx_stats->syncp);898 899		return NVSP_STAT_SUCCESS; /* consumed by XDP */900	}901 902	/* Allocate a skb - TODO direct I/O to pages? */903	skb = netvsc_alloc_recv_skb(net, nvchan, &xdp);904 905	if (unlikely(!skb)) {906		++net_device_ctx->eth_stats.rx_no_memory;907		return NVSP_STAT_FAIL;908	}909 910	skb_record_rx_queue(skb, q_idx);911 912	/*913	 * Even if injecting the packet, record the statistics914	 * on the synthetic device because modifying the VF device915	 * statistics will not work correctly.916	 */917	u64_stats_update_begin(&rx_stats->syncp);918	if (act == XDP_TX)919		rx_stats->xdp_tx++;920 921	rx_stats->packets++;922	rx_stats->bytes += nvchan->rsc.pktlen;923 924	if (skb->pkt_type == PACKET_BROADCAST)925		++rx_stats->broadcast;926	else if (skb->pkt_type == PACKET_MULTICAST)927		++rx_stats->multicast;928	u64_stats_update_end(&rx_stats->syncp);929 930	if (act == XDP_TX) {931		netvsc_xdp_xmit(skb, net);932		return NVSP_STAT_SUCCESS;933	}934 935	napi_gro_receive(&nvchan->napi, skb);936	return NVSP_STAT_SUCCESS;937}938 939static void netvsc_get_drvinfo(struct net_device *net,940			       struct ethtool_drvinfo *info)941{942	strscpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));943	strscpy(info->fw_version, "N/A", sizeof(info->fw_version));944}945 946static void netvsc_get_channels(struct net_device *net,947				struct ethtool_channels *channel)948{949	struct net_device_context *net_device_ctx = netdev_priv(net);950	struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);951 952	if (nvdev) {953		channel->max_combined	= nvdev->max_chn;954		channel->combined_count = nvdev->num_chn;955	}956}957 958/* Alloc struct netvsc_device_info, and initialize it from either existing959 * struct netvsc_device, or from default values.960 */961static962struct netvsc_device_info *netvsc_devinfo_get(struct netvsc_device *nvdev)963{964	struct netvsc_device_info *dev_info;965	struct bpf_prog *prog;966 967	dev_info = kzalloc(sizeof(*dev_info), GFP_ATOMIC);968 969	if (!dev_info)970		return NULL;971 972	if (nvdev) {973		ASSERT_RTNL();974 975		dev_info->num_chn = nvdev->num_chn;976		dev_info->send_sections = nvdev->send_section_cnt;977		dev_info->send_section_size = nvdev->send_section_size;978		dev_info->recv_sections = nvdev->recv_section_cnt;979		dev_info->recv_section_size = nvdev->recv_section_size;980 981		memcpy(dev_info->rss_key, nvdev->extension->rss_key,982		       NETVSC_HASH_KEYLEN);983 984		prog = netvsc_xdp_get(nvdev);985		if (prog) {986			bpf_prog_inc(prog);987			dev_info->bprog = prog;988		}989	} else {990		dev_info->num_chn = max(VRSS_CHANNEL_DEFAULT,991					netif_get_num_default_rss_queues());992		dev_info->send_sections = NETVSC_DEFAULT_TX;993		dev_info->send_section_size = NETVSC_SEND_SECTION_SIZE;994		dev_info->recv_sections = NETVSC_DEFAULT_RX;995		dev_info->recv_section_size = NETVSC_RECV_SECTION_SIZE;996	}997 998	return dev_info;999}1000 1001/* Free struct netvsc_device_info */1002static void netvsc_devinfo_put(struct netvsc_device_info *dev_info)1003{1004	if (dev_info->bprog) {1005		ASSERT_RTNL();1006		bpf_prog_put(dev_info->bprog);1007	}1008 1009	kfree(dev_info);1010}1011 1012static int netvsc_detach(struct net_device *ndev,1013			 struct netvsc_device *nvdev)1014{1015	struct net_device_context *ndev_ctx = netdev_priv(ndev);1016	struct hv_device *hdev = ndev_ctx->device_ctx;1017	int ret;1018 1019	/* Don't try continuing to try and setup sub channels */1020	if (cancel_work_sync(&nvdev->subchan_work))1021		nvdev->num_chn = 1;1022 1023	netvsc_xdp_set(ndev, NULL, NULL, nvdev);1024 1025	/* If device was up (receiving) then shutdown */1026	if (netif_running(ndev)) {1027		netvsc_tx_disable(nvdev, ndev);1028 1029		ret = rndis_filter_close(nvdev);1030		if (ret) {1031			netdev_err(ndev,1032				   "unable to close device (ret %d).\n", ret);1033			return ret;1034		}1035 1036		ret = netvsc_wait_until_empty(nvdev);1037		if (ret) {1038			netdev_err(ndev,1039				   "Ring buffer not empty after closing rndis\n");1040			return ret;1041		}1042	}1043 1044	netif_device_detach(ndev);1045 1046	rndis_filter_device_remove(hdev, nvdev);1047 1048	return 0;1049}1050 1051static int netvsc_attach(struct net_device *ndev,1052			 struct netvsc_device_info *dev_info)1053{1054	struct net_device_context *ndev_ctx = netdev_priv(ndev);1055	struct hv_device *hdev = ndev_ctx->device_ctx;1056	struct netvsc_device *nvdev;1057	struct rndis_device *rdev;1058	struct bpf_prog *prog;1059	int ret = 0;1060 1061	nvdev = rndis_filter_device_add(hdev, dev_info);1062	if (IS_ERR(nvdev))1063		return PTR_ERR(nvdev);1064 1065	if (nvdev->num_chn > 1) {1066		ret = rndis_set_subchannel(ndev, nvdev, dev_info);1067 1068		/* if unavailable, just proceed with one queue */1069		if (ret) {1070			nvdev->max_chn = 1;1071			nvdev->num_chn = 1;1072		}1073	}1074 1075	prog = dev_info->bprog;1076	if (prog) {1077		bpf_prog_inc(prog);1078		ret = netvsc_xdp_set(ndev, prog, NULL, nvdev);1079		if (ret) {1080			bpf_prog_put(prog);1081			goto err1;1082		}1083	}1084 1085	/* In any case device is now ready */1086	nvdev->tx_disable = false;1087	netif_device_attach(ndev);1088 1089	/* Note: enable and attach happen when sub-channels setup */1090	netif_carrier_off(ndev);1091 1092	if (netif_running(ndev)) {1093		ret = rndis_filter_open(nvdev);1094		if (ret)1095			goto err2;1096 1097		rdev = nvdev->extension;1098		if (!rdev->link_state)1099			netif_carrier_on(ndev);1100	}1101 1102	return 0;1103 1104err2:1105	netif_device_detach(ndev);1106 1107err1:1108	rndis_filter_device_remove(hdev, nvdev);1109 1110	return ret;1111}1112 1113static int netvsc_set_channels(struct net_device *net,1114			       struct ethtool_channels *channels)1115{1116	struct net_device_context *net_device_ctx = netdev_priv(net);1117	struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);1118	unsigned int orig, count = channels->combined_count;1119	struct netvsc_device_info *device_info;1120	int ret;1121 1122	/* We do not support separate count for rx, tx, or other */1123	if (count == 0 ||1124	    channels->rx_count || channels->tx_count || channels->other_count)1125		return -EINVAL;1126 1127	if (!nvdev || nvdev->destroy)1128		return -ENODEV;1129 1130	if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5)1131		return -EINVAL;1132 1133	if (count > nvdev->max_chn)1134		return -EINVAL;1135 1136	orig = nvdev->num_chn;1137 1138	device_info = netvsc_devinfo_get(nvdev);1139 1140	if (!device_info)1141		return -ENOMEM;1142 1143	device_info->num_chn = count;1144 1145	ret = netvsc_detach(net, nvdev);1146	if (ret)1147		goto out;1148 1149	ret = netvsc_attach(net, device_info);1150	if (ret) {1151		device_info->num_chn = orig;1152		if (netvsc_attach(net, device_info))1153			netdev_err(net, "restoring channel setting failed\n");1154	}1155 1156out:1157	netvsc_devinfo_put(device_info);1158	return ret;1159}1160 1161static void netvsc_init_settings(struct net_device *dev)1162{1163	struct net_device_context *ndc = netdev_priv(dev);1164 1165	ndc->l4_hash = HV_DEFAULT_L4HASH;1166 1167	ndc->speed = SPEED_UNKNOWN;1168	ndc->duplex = DUPLEX_FULL;1169 1170	dev->features = NETIF_F_LRO;1171}1172 1173static int netvsc_get_link_ksettings(struct net_device *dev,1174				     struct ethtool_link_ksettings *cmd)1175{1176	struct net_device_context *ndc = netdev_priv(dev);1177	struct net_device *vf_netdev;1178 1179	vf_netdev = rtnl_dereference(ndc->vf_netdev);1180 1181	if (vf_netdev)1182		return __ethtool_get_link_ksettings(vf_netdev, cmd);1183 1184	cmd->base.speed = ndc->speed;1185	cmd->base.duplex = ndc->duplex;1186	cmd->base.port = PORT_OTHER;1187 1188	return 0;1189}1190 1191static int netvsc_set_link_ksettings(struct net_device *dev,1192				     const struct ethtool_link_ksettings *cmd)1193{1194	struct net_device_context *ndc = netdev_priv(dev);1195	struct net_device *vf_netdev = rtnl_dereference(ndc->vf_netdev);1196 1197	if (vf_netdev) {1198		if (!vf_netdev->ethtool_ops->set_link_ksettings)1199			return -EOPNOTSUPP;1200 1201		return vf_netdev->ethtool_ops->set_link_ksettings(vf_netdev,1202								  cmd);1203	}1204 1205	return ethtool_virtdev_set_link_ksettings(dev, cmd,1206						  &ndc->speed, &ndc->duplex);1207}1208 1209static int netvsc_change_mtu(struct net_device *ndev, int mtu)1210{1211	struct net_device_context *ndevctx = netdev_priv(ndev);1212	struct net_device *vf_netdev = rtnl_dereference(ndevctx->vf_netdev);1213	struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);1214	int orig_mtu = ndev->mtu;1215	struct netvsc_device_info *device_info;1216	int ret = 0;1217 1218	if (!nvdev || nvdev->destroy)1219		return -ENODEV;1220 1221	device_info = netvsc_devinfo_get(nvdev);1222 1223	if (!device_info)1224		return -ENOMEM;1225 1226	/* Change MTU of underlying VF netdev first. */1227	if (vf_netdev) {1228		ret = dev_set_mtu(vf_netdev, mtu);1229		if (ret)1230			goto out;1231	}1232 1233	ret = netvsc_detach(ndev, nvdev);1234	if (ret)1235		goto rollback_vf;1236 1237	WRITE_ONCE(ndev->mtu, mtu);1238 1239	ret = netvsc_attach(ndev, device_info);1240	if (!ret)1241		goto out;1242 1243	/* Attempt rollback to original MTU */1244	WRITE_ONCE(ndev->mtu, orig_mtu);1245 1246	if (netvsc_attach(ndev, device_info))1247		netdev_err(ndev, "restoring mtu failed\n");1248rollback_vf:1249	if (vf_netdev)1250		dev_set_mtu(vf_netdev, orig_mtu);1251 1252out:1253	netvsc_devinfo_put(device_info);1254	return ret;1255}1256 1257static void netvsc_get_vf_stats(struct net_device *net,1258				struct netvsc_vf_pcpu_stats *tot)1259{1260	struct net_device_context *ndev_ctx = netdev_priv(net);1261	int i;1262 1263	memset(tot, 0, sizeof(*tot));1264 1265	for_each_possible_cpu(i) {1266		const struct netvsc_vf_pcpu_stats *stats1267			= per_cpu_ptr(ndev_ctx->vf_stats, i);1268		u64 rx_packets, rx_bytes, tx_packets, tx_bytes;1269		unsigned int start;1270 1271		do {1272			start = u64_stats_fetch_begin(&stats->syncp);1273			rx_packets = stats->rx_packets;1274			tx_packets = stats->tx_packets;1275			rx_bytes = stats->rx_bytes;1276			tx_bytes = stats->tx_bytes;1277		} while (u64_stats_fetch_retry(&stats->syncp, start));1278 1279		tot->rx_packets += rx_packets;1280		tot->tx_packets += tx_packets;1281		tot->rx_bytes   += rx_bytes;1282		tot->tx_bytes   += tx_bytes;1283		tot->tx_dropped += stats->tx_dropped;1284	}1285}1286 1287static void netvsc_get_pcpu_stats(struct net_device *net,1288				  struct netvsc_ethtool_pcpu_stats *pcpu_tot)1289{1290	struct net_device_context *ndev_ctx = netdev_priv(net);1291	struct netvsc_device *nvdev = rcu_dereference_rtnl(ndev_ctx->nvdev);1292	int i;1293 1294	/* fetch percpu stats of vf */1295	for_each_possible_cpu(i) {1296		const struct netvsc_vf_pcpu_stats *stats =1297			per_cpu_ptr(ndev_ctx->vf_stats, i);1298		struct netvsc_ethtool_pcpu_stats *this_tot = &pcpu_tot[i];1299		unsigned int start;1300 1301		do {1302			start = u64_stats_fetch_begin(&stats->syncp);1303			this_tot->vf_rx_packets = stats->rx_packets;1304			this_tot->vf_tx_packets = stats->tx_packets;1305			this_tot->vf_rx_bytes = stats->rx_bytes;1306			this_tot->vf_tx_bytes = stats->tx_bytes;1307		} while (u64_stats_fetch_retry(&stats->syncp, start));1308		this_tot->rx_packets = this_tot->vf_rx_packets;1309		this_tot->tx_packets = this_tot->vf_tx_packets;1310		this_tot->rx_bytes   = this_tot->vf_rx_bytes;1311		this_tot->tx_bytes   = this_tot->vf_tx_bytes;1312	}1313 1314	/* fetch percpu stats of netvsc */1315	for (i = 0; i < nvdev->num_chn; i++) {1316		const struct netvsc_channel *nvchan = &nvdev->chan_table[i];1317		const struct netvsc_stats_tx *tx_stats;1318		const struct netvsc_stats_rx *rx_stats;1319		struct netvsc_ethtool_pcpu_stats *this_tot =1320			&pcpu_tot[nvchan->channel->target_cpu];1321		u64 packets, bytes;1322		unsigned int start;1323 1324		tx_stats = &nvchan->tx_stats;1325		do {1326			start = u64_stats_fetch_begin(&tx_stats->syncp);1327			packets = tx_stats->packets;1328			bytes = tx_stats->bytes;1329		} while (u64_stats_fetch_retry(&tx_stats->syncp, start));1330 1331		this_tot->tx_bytes	+= bytes;1332		this_tot->tx_packets	+= packets;1333 1334		rx_stats = &nvchan->rx_stats;1335		do {1336			start = u64_stats_fetch_begin(&rx_stats->syncp);1337			packets = rx_stats->packets;1338			bytes = rx_stats->bytes;1339		} while (u64_stats_fetch_retry(&rx_stats->syncp, start));1340 1341		this_tot->rx_bytes	+= bytes;1342		this_tot->rx_packets	+= packets;1343	}1344}1345 1346static void netvsc_get_stats64(struct net_device *net,1347			       struct rtnl_link_stats64 *t)1348{1349	struct net_device_context *ndev_ctx = netdev_priv(net);1350	struct netvsc_device *nvdev;1351	struct netvsc_vf_pcpu_stats vf_tot;1352	int i;1353 1354	rcu_read_lock();1355 1356	nvdev = rcu_dereference(ndev_ctx->nvdev);1357	if (!nvdev)1358		goto out;1359 1360	netdev_stats_to_stats64(t, &net->stats);1361 1362	netvsc_get_vf_stats(net, &vf_tot);1363	t->rx_packets += vf_tot.rx_packets;1364	t->tx_packets += vf_tot.tx_packets;1365	t->rx_bytes   += vf_tot.rx_bytes;1366	t->tx_bytes   += vf_tot.tx_bytes;1367	t->tx_dropped += vf_tot.tx_dropped;1368 1369	for (i = 0; i < nvdev->num_chn; i++) {1370		const struct netvsc_channel *nvchan = &nvdev->chan_table[i];1371		const struct netvsc_stats_tx *tx_stats;1372		const struct netvsc_stats_rx *rx_stats;1373		u64 packets, bytes, multicast;1374		unsigned int start;1375 1376		tx_stats = &nvchan->tx_stats;1377		do {1378			start = u64_stats_fetch_begin(&tx_stats->syncp);1379			packets = tx_stats->packets;1380			bytes = tx_stats->bytes;1381		} while (u64_stats_fetch_retry(&tx_stats->syncp, start));1382 1383		t->tx_bytes	+= bytes;1384		t->tx_packets	+= packets;1385 1386		rx_stats = &nvchan->rx_stats;1387		do {1388			start = u64_stats_fetch_begin(&rx_stats->syncp);1389			packets = rx_stats->packets;1390			bytes = rx_stats->bytes;1391			multicast = rx_stats->multicast + rx_stats->broadcast;1392		} while (u64_stats_fetch_retry(&rx_stats->syncp, start));1393 1394		t->rx_bytes	+= bytes;1395		t->rx_packets	+= packets;1396		t->multicast	+= multicast;1397	}1398out:1399	rcu_read_unlock();1400}1401 1402static int netvsc_set_mac_addr(struct net_device *ndev, void *p)1403{1404	struct net_device_context *ndc = netdev_priv(ndev);1405	struct net_device *vf_netdev = rtnl_dereference(ndc->vf_netdev);1406	struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);1407	struct sockaddr *addr = p;1408	int err;1409 1410	err = eth_prepare_mac_addr_change(ndev, p);1411	if (err)1412		return err;1413 1414	if (!nvdev)1415		return -ENODEV;1416 1417	if (vf_netdev) {1418		err = dev_set_mac_address(vf_netdev, addr, NULL);1419		if (err)1420			return err;1421	}1422 1423	err = rndis_filter_set_device_mac(nvdev, addr->sa_data);1424	if (!err) {1425		eth_commit_mac_addr_change(ndev, p);1426	} else if (vf_netdev) {1427		/* rollback change on VF */1428		memcpy(addr->sa_data, ndev->dev_addr, ETH_ALEN);1429		dev_set_mac_address(vf_netdev, addr, NULL);1430	}1431 1432	return err;1433}1434 1435static const struct {1436	char name[ETH_GSTRING_LEN];1437	u16 offset;1438} netvsc_stats[] = {1439	{ "tx_scattered", offsetof(struct netvsc_ethtool_stats, tx_scattered) },1440	{ "tx_no_memory", offsetof(struct netvsc_ethtool_stats, tx_no_memory) },1441	{ "tx_no_space",  offsetof(struct netvsc_ethtool_stats, tx_no_space) },1442	{ "tx_too_big",	  offsetof(struct netvsc_ethtool_stats, tx_too_big) },1443	{ "tx_busy",	  offsetof(struct netvsc_ethtool_stats, tx_busy) },1444	{ "tx_send_full", offsetof(struct netvsc_ethtool_stats, tx_send_full) },1445	{ "rx_comp_busy", offsetof(struct netvsc_ethtool_stats, rx_comp_busy) },1446	{ "rx_no_memory", offsetof(struct netvsc_ethtool_stats, rx_no_memory) },1447	{ "stop_queue", offsetof(struct netvsc_ethtool_stats, stop_queue) },1448	{ "wake_queue", offsetof(struct netvsc_ethtool_stats, wake_queue) },1449	{ "vlan_error", offsetof(struct netvsc_ethtool_stats, vlan_error) },1450}, pcpu_stats[] = {1451	{ "cpu%u_rx_packets",1452		offsetof(struct netvsc_ethtool_pcpu_stats, rx_packets) },1453	{ "cpu%u_rx_bytes",1454		offsetof(struct netvsc_ethtool_pcpu_stats, rx_bytes) },1455	{ "cpu%u_tx_packets",1456		offsetof(struct netvsc_ethtool_pcpu_stats, tx_packets) },1457	{ "cpu%u_tx_bytes",1458		offsetof(struct netvsc_ethtool_pcpu_stats, tx_bytes) },1459	{ "cpu%u_vf_rx_packets",1460		offsetof(struct netvsc_ethtool_pcpu_stats, vf_rx_packets) },1461	{ "cpu%u_vf_rx_bytes",1462		offsetof(struct netvsc_ethtool_pcpu_stats, vf_rx_bytes) },1463	{ "cpu%u_vf_tx_packets",1464		offsetof(struct netvsc_ethtool_pcpu_stats, vf_tx_packets) },1465	{ "cpu%u_vf_tx_bytes",1466		offsetof(struct netvsc_ethtool_pcpu_stats, vf_tx_bytes) },1467}, vf_stats[] = {1468	{ "vf_rx_packets", offsetof(struct netvsc_vf_pcpu_stats, rx_packets) },1469	{ "vf_rx_bytes",   offsetof(struct netvsc_vf_pcpu_stats, rx_bytes) },1470	{ "vf_tx_packets", offsetof(struct netvsc_vf_pcpu_stats, tx_packets) },1471	{ "vf_tx_bytes",   offsetof(struct netvsc_vf_pcpu_stats, tx_bytes) },1472	{ "vf_tx_dropped", offsetof(struct netvsc_vf_pcpu_stats, tx_dropped) },1473};1474 1475#define NETVSC_GLOBAL_STATS_LEN	ARRAY_SIZE(netvsc_stats)1476#define NETVSC_VF_STATS_LEN	ARRAY_SIZE(vf_stats)1477 1478/* statistics per queue (rx/tx packets/bytes) */1479#define NETVSC_PCPU_STATS_LEN (num_present_cpus() * ARRAY_SIZE(pcpu_stats))1480 1481/* 8 statistics per queue (rx/tx packets/bytes, XDP actions) */1482#define NETVSC_QUEUE_STATS_LEN(dev) ((dev)->num_chn * 8)1483 1484static int netvsc_get_sset_count(struct net_device *dev, int string_set)1485{1486	struct net_device_context *ndc = netdev_priv(dev);1487	struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);1488 1489	if (!nvdev)1490		return -ENODEV;1491 1492	switch (string_set) {1493	case ETH_SS_STATS:1494		return NETVSC_GLOBAL_STATS_LEN1495			+ NETVSC_VF_STATS_LEN1496			+ NETVSC_QUEUE_STATS_LEN(nvdev)1497			+ NETVSC_PCPU_STATS_LEN;1498	default:1499		return -EINVAL;1500	}1501}1502 1503static void netvsc_get_ethtool_stats(struct net_device *dev,1504				     struct ethtool_stats *stats, u64 *data)1505{1506	struct net_device_context *ndc = netdev_priv(dev);1507	struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);1508	const void *nds = &ndc->eth_stats;1509	const struct netvsc_stats_tx *tx_stats;1510	const struct netvsc_stats_rx *rx_stats;1511	struct netvsc_vf_pcpu_stats sum;1512	struct netvsc_ethtool_pcpu_stats *pcpu_sum;1513	unsigned int start;1514	u64 packets, bytes;1515	u64 xdp_drop;1516	u64 xdp_redirect;1517	u64 xdp_tx;1518	u64 xdp_xmit;1519	int i, j, cpu;1520 1521	if (!nvdev)1522		return;1523 1524	for (i = 0; i < NETVSC_GLOBAL_STATS_LEN; i++)1525		data[i] = *(unsigned long *)(nds + netvsc_stats[i].offset);1526 1527	netvsc_get_vf_stats(dev, &sum);1528	for (j = 0; j < NETVSC_VF_STATS_LEN; j++)1529		data[i++] = *(u64 *)((void *)&sum + vf_stats[j].offset);1530 1531	for (j = 0; j < nvdev->num_chn; j++) {1532		tx_stats = &nvdev->chan_table[j].tx_stats;1533 1534		do {1535			start = u64_stats_fetch_begin(&tx_stats->syncp);1536			packets = tx_stats->packets;1537			bytes = tx_stats->bytes;1538			xdp_xmit = tx_stats->xdp_xmit;1539		} while (u64_stats_fetch_retry(&tx_stats->syncp, start));1540		data[i++] = packets;1541		data[i++] = bytes;1542		data[i++] = xdp_xmit;1543 1544		rx_stats = &nvdev->chan_table[j].rx_stats;1545		do {1546			start = u64_stats_fetch_begin(&rx_stats->syncp);1547			packets = rx_stats->packets;1548			bytes = rx_stats->bytes;1549			xdp_drop = rx_stats->xdp_drop;1550			xdp_redirect = rx_stats->xdp_redirect;1551			xdp_tx = rx_stats->xdp_tx;1552		} while (u64_stats_fetch_retry(&rx_stats->syncp, start));1553		data[i++] = packets;1554		data[i++] = bytes;1555		data[i++] = xdp_drop;1556		data[i++] = xdp_redirect;1557		data[i++] = xdp_tx;1558	}1559 1560	pcpu_sum = kvmalloc_array(num_possible_cpus(),1561				  sizeof(struct netvsc_ethtool_pcpu_stats),1562				  GFP_KERNEL);1563	if (!pcpu_sum)1564		return;1565 1566	netvsc_get_pcpu_stats(dev, pcpu_sum);1567	for_each_present_cpu(cpu) {1568		struct netvsc_ethtool_pcpu_stats *this_sum = &pcpu_sum[cpu];1569 1570		for (j = 0; j < ARRAY_SIZE(pcpu_stats); j++)1571			data[i++] = *(u64 *)((void *)this_sum1572					     + pcpu_stats[j].offset);1573	}1574	kvfree(pcpu_sum);1575}1576 1577static void netvsc_get_strings(struct net_device *dev, u32 stringset, u8 *data)1578{1579	struct net_device_context *ndc = netdev_priv(dev);1580	struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);1581	u8 *p = data;1582	int i, cpu;1583 1584	if (!nvdev)1585		return;1586 1587	switch (stringset) {1588	case ETH_SS_STATS:1589		for (i = 0; i < ARRAY_SIZE(netvsc_stats); i++)1590			ethtool_puts(&p, netvsc_stats[i].name);1591 1592		for (i = 0; i < ARRAY_SIZE(vf_stats); i++)1593			ethtool_puts(&p, vf_stats[i].name);1594 1595		for (i = 0; i < nvdev->num_chn; i++) {1596			ethtool_sprintf(&p, "tx_queue_%u_packets", i);1597			ethtool_sprintf(&p, "tx_queue_%u_bytes", i);1598			ethtool_sprintf(&p, "tx_queue_%u_xdp_xmit", i);1599			ethtool_sprintf(&p, "rx_queue_%u_packets", i);1600			ethtool_sprintf(&p, "rx_queue_%u_bytes", i);1601			ethtool_sprintf(&p, "rx_queue_%u_xdp_drop", i);1602			ethtool_sprintf(&p, "rx_queue_%u_xdp_redirect", i);1603			ethtool_sprintf(&p, "rx_queue_%u_xdp_tx", i);1604		}1605 1606		for_each_present_cpu(cpu) {1607			for (i = 0; i < ARRAY_SIZE(pcpu_stats); i++)1608				ethtool_sprintf(&p, pcpu_stats[i].name, cpu);1609		}1610 1611		break;1612	}1613}1614 1615static int1616netvsc_get_rss_hash_opts(struct net_device_context *ndc,1617			 struct ethtool_rxnfc *info)1618{1619	const u32 l4_flag = RXH_L4_B_0_1 | RXH_L4_B_2_3;1620 1621	info->data = RXH_IP_SRC | RXH_IP_DST;1622 1623	switch (info->flow_type) {1624	case TCP_V4_FLOW:1625		if (ndc->l4_hash & HV_TCP4_L4HASH)1626			info->data |= l4_flag;1627 1628		break;1629 1630	case TCP_V6_FLOW:1631		if (ndc->l4_hash & HV_TCP6_L4HASH)1632			info->data |= l4_flag;1633 1634		break;1635 1636	case UDP_V4_FLOW:1637		if (ndc->l4_hash & HV_UDP4_L4HASH)1638			info->data |= l4_flag;1639 1640		break;1641 1642	case UDP_V6_FLOW:1643		if (ndc->l4_hash & HV_UDP6_L4HASH)1644			info->data |= l4_flag;1645 1646		break;1647 1648	case IPV4_FLOW:1649	case IPV6_FLOW:1650		break;1651	default:1652		info->data = 0;1653		break;1654	}1655 1656	return 0;1657}1658 1659static int1660netvsc_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info,1661		 u32 *rules)1662{1663	struct net_device_context *ndc = netdev_priv(dev);1664	struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);1665 1666	if (!nvdev)1667		return -ENODEV;1668 1669	switch (info->cmd) {1670	case ETHTOOL_GRXRINGS:1671		info->data = nvdev->num_chn;1672		return 0;1673 1674	case ETHTOOL_GRXFH:1675		return netvsc_get_rss_hash_opts(ndc, info);1676	}1677	return -EOPNOTSUPP;1678}1679 1680static int netvsc_set_rss_hash_opts(struct net_device_context *ndc,1681				    struct ethtool_rxnfc *info)1682{1683	if (info->data == (RXH_IP_SRC | RXH_IP_DST |1684			   RXH_L4_B_0_1 | RXH_L4_B_2_3)) {1685		switch (info->flow_type) {1686		case TCP_V4_FLOW:1687			ndc->l4_hash |= HV_TCP4_L4HASH;1688			break;1689 1690		case TCP_V6_FLOW:1691			ndc->l4_hash |= HV_TCP6_L4HASH;1692			break;1693 1694		case UDP_V4_FLOW:1695			ndc->l4_hash |= HV_UDP4_L4HASH;1696			break;1697 1698		case UDP_V6_FLOW:1699			ndc->l4_hash |= HV_UDP6_L4HASH;1700			break;1701 1702		default:1703			return -EOPNOTSUPP;1704		}1705 1706		return 0;1707	}1708 1709	if (info->data == (RXH_IP_SRC | RXH_IP_DST)) {1710		switch (info->flow_type) {1711		case TCP_V4_FLOW:1712			ndc->l4_hash &= ~HV_TCP4_L4HASH;1713			break;1714 1715		case TCP_V6_FLOW:1716			ndc->l4_hash &= ~HV_TCP6_L4HASH;1717			break;1718 1719		case UDP_V4_FLOW:1720			ndc->l4_hash &= ~HV_UDP4_L4HASH;1721			break;1722 1723		case UDP_V6_FLOW:1724			ndc->l4_hash &= ~HV_UDP6_L4HASH;1725			break;1726 1727		default:1728			return -EOPNOTSUPP;1729		}1730 1731		return 0;1732	}1733 1734	return -EOPNOTSUPP;1735}1736 1737static int1738netvsc_set_rxnfc(struct net_device *ndev, struct ethtool_rxnfc *info)1739{1740	struct net_device_context *ndc = netdev_priv(ndev);1741 1742	if (info->cmd == ETHTOOL_SRXFH)1743		return netvsc_set_rss_hash_opts(ndc, info);1744 1745	return -EOPNOTSUPP;1746}1747 1748static u32 netvsc_get_rxfh_key_size(struct net_device *dev)1749{1750	return NETVSC_HASH_KEYLEN;1751}1752 1753static u32 netvsc_rss_indir_size(struct net_device *dev)1754{1755	struct net_device_context *ndc = netdev_priv(dev);1756 1757	return ndc->rx_table_sz;1758}1759 1760static int netvsc_get_rxfh(struct net_device *dev,1761			   struct ethtool_rxfh_param *rxfh)1762{1763	struct net_device_context *ndc = netdev_priv(dev);1764	struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);1765	struct rndis_device *rndis_dev;1766	int i;1767 1768	if (!ndev)1769		return -ENODEV;1770 1771	rxfh->hfunc = ETH_RSS_HASH_TOP;	/* Toeplitz */1772 1773	rndis_dev = ndev->extension;1774	if (rxfh->indir) {1775		for (i = 0; i < ndc->rx_table_sz; i++)1776			rxfh->indir[i] = ndc->rx_table[i];1777	}1778 1779	if (rxfh->key)1780		memcpy(rxfh->key, rndis_dev->rss_key, NETVSC_HASH_KEYLEN);1781 1782	return 0;1783}1784 1785static int netvsc_set_rxfh(struct net_device *dev,1786			   struct ethtool_rxfh_param *rxfh,1787			   struct netlink_ext_ack *extack)1788{1789	struct net_device_context *ndc = netdev_priv(dev);1790	struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);1791	struct rndis_device *rndis_dev;1792	u8 *key = rxfh->key;1793	int i;1794 1795	if (!ndev)1796		return -ENODEV;1797 1798	if (rxfh->hfunc != ETH_RSS_HASH_NO_CHANGE &&1799	    rxfh->hfunc != ETH_RSS_HASH_TOP)1800		return -EOPNOTSUPP;1801 1802	rndis_dev = ndev->extension;1803	if (rxfh->indir) {1804		for (i = 0; i < ndc->rx_table_sz; i++)1805			if (rxfh->indir[i] >= ndev->num_chn)1806				return -EINVAL;1807 1808		for (i = 0; i < ndc->rx_table_sz; i++)1809			ndc->rx_table[i] = rxfh->indir[i];1810	}1811 1812	if (!key) {1813		if (!rxfh->indir)1814			return 0;1815 1816		key = rndis_dev->rss_key;1817	}1818 1819	return rndis_filter_set_rss_param(rndis_dev, key);1820}1821 1822/* Hyper-V RNDIS protocol does not have ring in the HW sense.1823 * It does have pre-allocated receive area which is divided into sections.1824 */1825static void __netvsc_get_ringparam(struct netvsc_device *nvdev,1826				   struct ethtool_ringparam *ring)1827{1828	u32 max_buf_size;1829 1830	ring->rx_pending = nvdev->recv_section_cnt;1831	ring->tx_pending = nvdev->send_section_cnt;1832 1833	if (nvdev->nvsp_version <= NVSP_PROTOCOL_VERSION_2)1834		max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;1835	else1836		max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;1837 1838	ring->rx_max_pending = max_buf_size / nvdev->recv_section_size;1839	ring->tx_max_pending = NETVSC_SEND_BUFFER_SIZE1840		/ nvdev->send_section_size;1841}1842 1843static void netvsc_get_ringparam(struct net_device *ndev,1844				 struct ethtool_ringparam *ring,1845				 struct kernel_ethtool_ringparam *kernel_ring,1846				 struct netlink_ext_ack *extack)1847{1848	struct net_device_context *ndevctx = netdev_priv(ndev);1849	struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);1850 1851	if (!nvdev)1852		return;1853 1854	__netvsc_get_ringparam(nvdev, ring);1855}1856 1857static int netvsc_set_ringparam(struct net_device *ndev,1858				struct ethtool_ringparam *ring,1859				struct kernel_ethtool_ringparam *kernel_ring,1860				struct netlink_ext_ack *extack)1861{1862	struct net_device_context *ndevctx = netdev_priv(ndev);1863	struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);1864	struct netvsc_device_info *device_info;1865	struct ethtool_ringparam orig;1866	u32 new_tx, new_rx;1867	int ret = 0;1868 1869	if (!nvdev || nvdev->destroy)1870		return -ENODEV;1871 1872	memset(&orig, 0, sizeof(orig));1873	__netvsc_get_ringparam(nvdev, &orig);1874 1875	new_tx = clamp_t(u32, ring->tx_pending,1876			 NETVSC_MIN_TX_SECTIONS, orig.tx_max_pending);1877	new_rx = clamp_t(u32, ring->rx_pending,1878			 NETVSC_MIN_RX_SECTIONS, orig.rx_max_pending);1879 1880	if (new_tx == orig.tx_pending &&1881	    new_rx == orig.rx_pending)1882		return 0;	 /* no change */1883 1884	device_info = netvsc_devinfo_get(nvdev);1885 1886	if (!device_info)1887		return -ENOMEM;1888 1889	device_info->send_sections = new_tx;1890	device_info->recv_sections = new_rx;1891 1892	ret = netvsc_detach(ndev, nvdev);1893	if (ret)1894		goto out;1895 1896	ret = netvsc_attach(ndev, device_info);1897	if (ret) {1898		device_info->send_sections = orig.tx_pending;1899		device_info->recv_sections = orig.rx_pending;1900 1901		if (netvsc_attach(ndev, device_info))1902			netdev_err(ndev, "restoring ringparam failed");1903	}1904 1905out:1906	netvsc_devinfo_put(device_info);1907	return ret;1908}1909 1910static netdev_features_t netvsc_fix_features(struct net_device *ndev,1911					     netdev_features_t features)1912{1913	struct net_device_context *ndevctx = netdev_priv(ndev);1914	struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);1915 1916	if (!nvdev || nvdev->destroy)1917		return features;1918 1919	if ((features & NETIF_F_LRO) && netvsc_xdp_get(nvdev)) {1920		features ^= NETIF_F_LRO;1921		netdev_info(ndev, "Skip LRO - unsupported with XDP\n");1922	}1923 1924	return features;1925}1926 1927static int netvsc_set_features(struct net_device *ndev,1928			       netdev_features_t features)1929{1930	netdev_features_t change = features ^ ndev->features;1931	struct net_device_context *ndevctx = netdev_priv(ndev);1932	struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);1933	struct net_device *vf_netdev = rtnl_dereference(ndevctx->vf_netdev);1934	struct ndis_offload_params offloads;1935	int ret = 0;1936 1937	if (!nvdev || nvdev->destroy)1938		return -ENODEV;1939 1940	if (!(change & NETIF_F_LRO))1941		goto syncvf;1942 1943	memset(&offloads, 0, sizeof(struct ndis_offload_params));1944 1945	if (features & NETIF_F_LRO) {1946		offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;1947		offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;1948	} else {1949		offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;1950		offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;1951	}1952 1953	ret = rndis_filter_set_offload_params(ndev, nvdev, &offloads);1954 1955	if (ret) {1956		features ^= NETIF_F_LRO;1957		ndev->features = features;1958	}1959 1960syncvf:1961	if (!vf_netdev)1962		return ret;1963 1964	vf_netdev->wanted_features = features;1965	netdev_update_features(vf_netdev);1966 1967	return ret;1968}1969 1970static int netvsc_get_regs_len(struct net_device *netdev)1971{1972	return VRSS_SEND_TAB_SIZE * sizeof(u32);1973}1974 1975static void netvsc_get_regs(struct net_device *netdev,1976			    struct ethtool_regs *regs, void *p)1977{1978	struct net_device_context *ndc = netdev_priv(netdev);1979	u32 *regs_buff = p;1980 1981	/* increase the version, if buffer format is changed. */1982	regs->version = 1;1983 1984	memcpy(regs_buff, ndc->tx_table, VRSS_SEND_TAB_SIZE * sizeof(u32));1985}1986 1987static u32 netvsc_get_msglevel(struct net_device *ndev)1988{1989	struct net_device_context *ndev_ctx = netdev_priv(ndev);1990 1991	return ndev_ctx->msg_enable;1992}1993 1994static void netvsc_set_msglevel(struct net_device *ndev, u32 val)1995{1996	struct net_device_context *ndev_ctx = netdev_priv(ndev);1997 1998	ndev_ctx->msg_enable = val;1999}2000 2001static const struct ethtool_ops ethtool_ops = {2002	.get_drvinfo	= netvsc_get_drvinfo,2003	.get_regs_len	= netvsc_get_regs_len,2004	.get_regs	= netvsc_get_regs,2005	.get_msglevel	= netvsc_get_msglevel,2006	.set_msglevel	= netvsc_set_msglevel,2007	.get_link	= ethtool_op_get_link,2008	.get_ethtool_stats = netvsc_get_ethtool_stats,2009	.get_sset_count = netvsc_get_sset_count,2010	.get_strings	= netvsc_get_strings,2011	.get_channels   = netvsc_get_channels,2012	.set_channels   = netvsc_set_channels,2013	.get_ts_info	= ethtool_op_get_ts_info,2014	.get_rxnfc	= netvsc_get_rxnfc,2015	.set_rxnfc	= netvsc_set_rxnfc,2016	.get_rxfh_key_size = netvsc_get_rxfh_key_size,2017	.get_rxfh_indir_size = netvsc_rss_indir_size,2018	.get_rxfh	= netvsc_get_rxfh,2019	.set_rxfh	= netvsc_set_rxfh,2020	.get_link_ksettings = netvsc_get_link_ksettings,2021	.set_link_ksettings = netvsc_set_link_ksettings,2022	.get_ringparam	= netvsc_get_ringparam,2023	.set_ringparam	= netvsc_set_ringparam,2024};2025 2026static const struct net_device_ops device_ops = {2027	.ndo_open =			netvsc_open,2028	.ndo_stop =			netvsc_close,2029	.ndo_start_xmit =		netvsc_start_xmit,2030	.ndo_change_rx_flags =		netvsc_change_rx_flags,2031	.ndo_set_rx_mode =		netvsc_set_rx_mode,2032	.ndo_fix_features =		netvsc_fix_features,2033	.ndo_set_features =		netvsc_set_features,2034	.ndo_change_mtu =		netvsc_change_mtu,2035	.ndo_validate_addr =		eth_validate_addr,2036	.ndo_set_mac_address =		netvsc_set_mac_addr,2037	.ndo_select_queue =		netvsc_select_queue,2038	.ndo_get_stats64 =		netvsc_get_stats64,2039	.ndo_bpf =			netvsc_bpf,2040	.ndo_xdp_xmit =			netvsc_ndoxdp_xmit,2041};2042 2043/*2044 * Handle link status changes. For RNDIS_STATUS_NETWORK_CHANGE emulate link2045 * down/up sequence. In case of RNDIS_STATUS_MEDIA_CONNECT when carrier is2046 * present send GARP packet to network peers with netif_notify_peers().2047 */2048static void netvsc_link_change(struct work_struct *w)2049{2050	struct net_device_context *ndev_ctx =2051		container_of(w, struct net_device_context, dwork.work);2052	struct hv_device *device_obj = ndev_ctx->device_ctx;2053	struct net_device *net = hv_get_drvdata(device_obj);2054	unsigned long flags, next_reconfig, delay;2055	struct netvsc_reconfig *event = NULL;2056	struct netvsc_device *net_device;2057	struct rndis_device *rdev;2058	bool reschedule = false;2059 2060	/* if changes are happening, comeback later */2061	if (!rtnl_trylock()) {2062		schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);2063		return;2064	}2065 2066	net_device = rtnl_dereference(ndev_ctx->nvdev);2067	if (!net_device)2068		goto out_unlock;2069 2070	rdev = net_device->extension;2071 2072	next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT;2073	if (time_is_after_jiffies(next_reconfig)) {2074		/* link_watch only sends one notification with current state2075		 * per second, avoid doing reconfig more frequently. Handle2076		 * wrap around.2077		 */2078		delay = next_reconfig - jiffies;2079		delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT;2080		schedule_delayed_work(&ndev_ctx->dwork, delay);2081		goto out_unlock;2082	}2083	ndev_ctx->last_reconfig = jiffies;2084 2085	spin_lock_irqsave(&ndev_ctx->lock, flags);2086	if (!list_empty(&ndev_ctx->reconfig_events)) {2087		event = list_first_entry(&ndev_ctx->reconfig_events,2088					 struct netvsc_reconfig, list);2089		list_del(&event->list);2090		reschedule = !list_empty(&ndev_ctx->reconfig_events);2091	}2092	spin_unlock_irqrestore(&ndev_ctx->lock, flags);2093 2094	if (!event)2095		goto out_unlock;2096 2097	switch (event->event) {2098		/* Only the following events are possible due to the check in2099		 * netvsc_linkstatus_callback()2100		 */2101	case RNDIS_STATUS_MEDIA_CONNECT:2102		if (rdev->link_state) {2103			rdev->link_state = false;2104			netif_carrier_on(net);2105			netvsc_tx_enable(net_device, net);2106		} else {2107			__netdev_notify_peers(net);2108		}2109		kfree(event);2110		break;2111	case RNDIS_STATUS_MEDIA_DISCONNECT:2112		if (!rdev->link_state) {2113			rdev->link_state = true;2114			netif_carrier_off(net);2115			netvsc_tx_disable(net_device, net);2116		}2117		kfree(event);2118		break;2119	case RNDIS_STATUS_NETWORK_CHANGE:2120		/* Only makes sense if carrier is present */2121		if (!rdev->link_state) {2122			rdev->link_state = true;2123			netif_carrier_off(net);2124			netvsc_tx_disable(net_device, net);2125			event->event = RNDIS_STATUS_MEDIA_CONNECT;2126			spin_lock_irqsave(&ndev_ctx->lock, flags);2127			list_add(&event->list, &ndev_ctx->reconfig_events);2128			spin_unlock_irqrestore(&ndev_ctx->lock, flags);2129			reschedule = true;2130		}2131		break;2132	}2133 2134	rtnl_unlock();2135 2136	/* link_watch only sends one notification with current state per2137	 * second, handle next reconfig event in 2 seconds.2138	 */2139	if (reschedule)2140		schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);2141 2142	return;2143 2144out_unlock:2145	rtnl_unlock();2146}2147 2148static struct net_device *get_netvsc_byref(struct net_device *vf_netdev)2149{2150	struct net_device_context *net_device_ctx;2151	struct net_device *dev;2152 2153	dev = netdev_master_upper_dev_get(vf_netdev);2154	if (!dev || dev->netdev_ops != &device_ops)2155		return NULL;	/* not a netvsc device */2156 2157	net_device_ctx = netdev_priv(dev);2158	if (!rtnl_dereference(net_device_ctx->nvdev))2159		return NULL;	/* device is removed */2160 2161	return dev;2162}2163 2164/* Called when VF is injecting data into network stack.2165 * Change the associated network device from VF to netvsc.2166 * note: already called with rcu_read_lock2167 */2168static rx_handler_result_t netvsc_vf_handle_frame(struct sk_buff **pskb)2169{2170	struct sk_buff *skb = *pskb;2171	struct net_device *ndev = rcu_dereference(skb->dev->rx_handler_data);2172	struct net_device_context *ndev_ctx = netdev_priv(ndev);2173	struct netvsc_vf_pcpu_stats *pcpu_stats2174		 = this_cpu_ptr(ndev_ctx->vf_stats);2175 2176	skb = skb_share_check(skb, GFP_ATOMIC);2177	if (unlikely(!skb))2178		return RX_HANDLER_CONSUMED;2179 2180	*pskb = skb;2181 2182	skb->dev = ndev;2183 2184	u64_stats_update_begin(&pcpu_stats->syncp);2185	pcpu_stats->rx_packets++;2186	pcpu_stats->rx_bytes += skb->len;2187	u64_stats_update_end(&pcpu_stats->syncp);2188 2189	return RX_HANDLER_ANOTHER;2190}2191 2192static int netvsc_vf_join(struct net_device *vf_netdev,2193			  struct net_device *ndev, int context)2194{2195	struct net_device_context *ndev_ctx = netdev_priv(ndev);2196	int ret;2197 2198	ret = netdev_rx_handler_register(vf_netdev,2199					 netvsc_vf_handle_frame, ndev);2200	if (ret != 0) {2201		netdev_err(vf_netdev,2202			   "can not register netvsc VF receive handler (err = %d)\n",2203			   ret);2204		goto rx_handler_failed;2205	}2206 2207	ret = netdev_master_upper_dev_link(vf_netdev, ndev,2208					   NULL, NULL, NULL);2209	if (ret != 0) {2210		netdev_err(vf_netdev,2211			   "can not set master device %s (err = %d)\n",2212			   ndev->name, ret);2213		goto upper_link_failed;2214	}2215 2216	/* If this registration is called from probe context vf_takeover2217	 * is taken care of later in probe itself.2218	 */2219	if (context == VF_REG_IN_NOTIFIER)2220		schedule_delayed_work(&ndev_ctx->vf_takeover, VF_TAKEOVER_INT);2221 2222	call_netdevice_notifiers(NETDEV_JOIN, vf_netdev);2223 2224	netdev_info(vf_netdev, "joined to %s\n", ndev->name);2225	return 0;2226 2227upper_link_failed:2228	netdev_rx_handler_unregister(vf_netdev);2229rx_handler_failed:2230	return ret;2231}2232 2233static void __netvsc_vf_setup(struct net_device *ndev,2234			      struct net_device *vf_netdev)2235{2236	int ret;2237 2238	/* Align MTU of VF with master */2239	ret = dev_set_mtu(vf_netdev, ndev->mtu);2240	if (ret)2241		netdev_warn(vf_netdev,2242			    "unable to change mtu to %u\n", ndev->mtu);2243 2244	/* set multicast etc flags on VF */2245	dev_change_flags(vf_netdev, ndev->flags | IFF_SLAVE, NULL);2246 2247	/* sync address list from ndev to VF */2248	netif_addr_lock_bh(ndev);2249	dev_uc_sync(vf_netdev, ndev);2250	dev_mc_sync(vf_netdev, ndev);2251	netif_addr_unlock_bh(ndev);2252 2253	if (netif_running(ndev)) {2254		ret = dev_open(vf_netdev, NULL);2255		if (ret)2256			netdev_warn(vf_netdev,2257				    "unable to open: %d\n", ret);2258	}2259}2260 2261/* Setup VF as slave of the synthetic device.2262 * Runs in workqueue to avoid recursion in netlink callbacks.2263 */2264static void netvsc_vf_setup(struct work_struct *w)2265{2266	struct net_device_context *ndev_ctx2267		= container_of(w, struct net_device_context, vf_takeover.work);2268	struct net_device *ndev = hv_get_drvdata(ndev_ctx->device_ctx);2269	struct net_device *vf_netdev;2270 2271	if (!rtnl_trylock()) {2272		schedule_delayed_work(&ndev_ctx->vf_takeover, 0);2273		return;2274	}2275 2276	vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);2277	if (vf_netdev)2278		__netvsc_vf_setup(ndev, vf_netdev);2279 2280	rtnl_unlock();2281}2282 2283/* Find netvsc by VF serial number.2284 * The PCI hyperv controller records the serial number as the slot kobj name.2285 */2286static struct net_device *get_netvsc_byslot(const struct net_device *vf_netdev)2287{2288	struct device *parent = vf_netdev->dev.parent;2289	struct net_device_context *ndev_ctx;2290	struct net_device *ndev;2291	struct pci_dev *pdev;2292	u32 serial;2293 2294	if (!parent || !dev_is_pci(parent))2295		return NULL; /* not a PCI device */2296 2297	pdev = to_pci_dev(parent);2298	if (!pdev->slot) {2299		netdev_notice(vf_netdev, "no PCI slot information\n");2300		return NULL;2301	}2302 2303	if (kstrtou32(pci_slot_name(pdev->slot), 10, &serial)) {2304		netdev_notice(vf_netdev, "Invalid vf serial:%s\n",2305			      pci_slot_name(pdev->slot));2306		return NULL;2307	}2308 2309	list_for_each_entry(ndev_ctx, &netvsc_dev_list, list) {2310		if (!ndev_ctx->vf_alloc)2311			continue;2312 2313		if (ndev_ctx->vf_serial != serial)2314			continue;2315 2316		ndev = hv_get_drvdata(ndev_ctx->device_ctx);2317		if (ndev->addr_len != vf_netdev->addr_len ||2318		    memcmp(ndev->perm_addr, vf_netdev->perm_addr,2319			   ndev->addr_len) != 0)2320			continue;2321 2322		return ndev;2323 2324	}2325 2326	/* Fallback path to check synthetic vf with help of mac addr.2327	 * Because this function can be called before vf_netdev is2328	 * initialized (NETDEV_POST_INIT) when its perm_addr has not been copied2329	 * from dev_addr, also try to match to its dev_addr.2330	 * Note: On Hyper-V and Azure, it's not possible to set a MAC address2331	 * on a VF that matches to the MAC of a unrelated NETVSC device.2332	 */2333	list_for_each_entry(ndev_ctx, &netvsc_dev_list, list) {2334		ndev = hv_get_drvdata(ndev_ctx->device_ctx);2335		if (ether_addr_equal(vf_netdev->perm_addr, ndev->perm_addr) ||2336		    ether_addr_equal(vf_netdev->dev_addr, ndev->perm_addr))2337			return ndev;2338	}2339 2340	netdev_notice(vf_netdev,2341		      "no netdev found for vf serial:%u\n", serial);2342	return NULL;2343}2344 2345static int netvsc_prepare_bonding(struct net_device *vf_netdev)2346{2347	struct net_device *ndev;2348 2349	ndev = get_netvsc_byslot(vf_netdev);2350	if (!ndev)2351		return NOTIFY_DONE;2352 2353	/* set slave flag before open to prevent IPv6 addrconf */2354	vf_netdev->flags |= IFF_SLAVE;2355	return NOTIFY_DONE;2356}2357 2358static int netvsc_register_vf(struct net_device *vf_netdev, int context)2359{2360	struct net_device_context *net_device_ctx;2361	struct netvsc_device *netvsc_dev;2362	struct bpf_prog *prog;2363	struct net_device *ndev;2364	int ret;2365 2366	if (vf_netdev->addr_len != ETH_ALEN)2367		return NOTIFY_DONE;2368 2369	ndev = get_netvsc_byslot(vf_netdev);2370	if (!ndev)2371		return NOTIFY_DONE;2372 2373	net_device_ctx = netdev_priv(ndev);2374	netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);2375	if (!netvsc_dev || rtnl_dereference(net_device_ctx->vf_netdev))2376		return NOTIFY_DONE;2377 2378	/* if synthetic interface is a different namespace,2379	 * then move the VF to that namespace; join will be2380	 * done again in that context.2381	 */2382	if (!net_eq(dev_net(ndev), dev_net(vf_netdev))) {2383		ret = dev_change_net_namespace(vf_netdev,2384					       dev_net(ndev), "eth%d");2385		if (ret)2386			netdev_err(vf_netdev,2387				   "could not move to same namespace as %s: %d\n",2388				   ndev->name, ret);2389		else2390			netdev_info(vf_netdev,2391				    "VF moved to namespace with: %s\n",2392				    ndev->name);2393		return NOTIFY_DONE;2394	}2395 2396	netdev_info(ndev, "VF registering: %s\n", vf_netdev->name);2397 2398	if (netvsc_vf_join(vf_netdev, ndev, context) != 0)2399		return NOTIFY_DONE;2400 2401	dev_hold(vf_netdev);2402	rcu_assign_pointer(net_device_ctx->vf_netdev, vf_netdev);2403 2404	if (ndev->needed_headroom < vf_netdev->needed_headroom)2405		ndev->needed_headroom = vf_netdev->needed_headroom;2406 2407	vf_netdev->wanted_features = ndev->features;2408	netdev_update_features(vf_netdev);2409 2410	prog = netvsc_xdp_get(netvsc_dev);2411	netvsc_vf_setxdp(vf_netdev, prog);2412 2413	return NOTIFY_OK;2414}2415 2416/* Change the data path when VF UP/DOWN/CHANGE are detected.2417 *2418 * Typically a UP or DOWN event is followed by a CHANGE event, so2419 * net_device_ctx->data_path_is_vf is used to cache the current data path2420 * to avoid the duplicate call of netvsc_switch_datapath() and the duplicate2421 * message.2422 *2423 * During hibernation, if a VF NIC driver (e.g. mlx5) preserves the network2424 * interface, there is only the CHANGE event and no UP or DOWN event.2425 */2426static int netvsc_vf_changed(struct net_device *vf_netdev, unsigned long event)2427{2428	struct net_device_context *net_device_ctx;2429	struct netvsc_device *netvsc_dev;2430	struct net_device *ndev;2431	bool vf_is_up = false;2432	int ret;2433 2434	if (event != NETDEV_GOING_DOWN)2435		vf_is_up = netif_running(vf_netdev);2436 2437	ndev = get_netvsc_byref(vf_netdev);2438	if (!ndev)2439		return NOTIFY_DONE;2440 2441	net_device_ctx = netdev_priv(ndev);2442	netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);2443	if (!netvsc_dev)2444		return NOTIFY_DONE;2445 2446	if (net_device_ctx->data_path_is_vf == vf_is_up)2447		return NOTIFY_OK;2448 2449	if (vf_is_up && !net_device_ctx->vf_alloc) {2450		netdev_info(ndev, "Waiting for the VF association from host\n");2451		wait_for_completion(&net_device_ctx->vf_add);2452	}2453 2454	ret = netvsc_switch_datapath(ndev, vf_is_up);2455 2456	if (ret) {2457		netdev_err(ndev,2458			   "Data path failed to switch %s VF: %s, err: %d\n",2459			   vf_is_up ? "to" : "from", vf_netdev->name, ret);2460		return NOTIFY_DONE;2461	} else {2462		netdev_info(ndev, "Data path switched %s VF: %s\n",2463			    vf_is_up ? "to" : "from", vf_netdev->name);2464	}2465 2466	return NOTIFY_OK;2467}2468 2469static int netvsc_unregister_vf(struct net_device *vf_netdev)2470{2471	struct net_device *ndev;2472	struct net_device_context *net_device_ctx;2473 2474	ndev = get_netvsc_byref(vf_netdev);2475	if (!ndev)2476		return NOTIFY_DONE;2477 2478	net_device_ctx = netdev_priv(ndev);2479	cancel_delayed_work_sync(&net_device_ctx->vf_takeover);2480 2481	netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);2482 2483	netvsc_vf_setxdp(vf_netdev, NULL);2484 2485	reinit_completion(&net_device_ctx->vf_add);2486	netdev_rx_handler_unregister(vf_netdev);2487	netdev_upper_dev_unlink(vf_netdev, ndev);2488	RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL);2489	dev_put(vf_netdev);2490 2491	ndev->needed_headroom = RNDIS_AND_PPI_SIZE;2492 2493	return NOTIFY_OK;2494}2495 2496static int check_dev_is_matching_vf(struct net_device *event_ndev)2497{2498	/* Skip NetVSC interfaces */2499	if (event_ndev->netdev_ops == &device_ops)2500		return -ENODEV;2501 2502	/* Avoid non-Ethernet type devices */2503	if (event_ndev->type != ARPHRD_ETHER)2504		return -ENODEV;2505 2506	/* Avoid Vlan dev with same MAC registering as VF */2507	if (is_vlan_dev(event_ndev))2508		return -ENODEV;2509 2510	/* Avoid Bonding master dev with same MAC registering as VF */2511	if (netif_is_bond_master(event_ndev))2512		return -ENODEV;2513 2514	return 0;2515}2516 2517static int netvsc_probe(struct hv_device *dev,2518			const struct hv_vmbus_device_id *dev_id)2519{2520	struct net_device *net = NULL, *vf_netdev;2521	struct net_device_context *net_device_ctx;2522	struct netvsc_device_info *device_info = NULL;2523	struct netvsc_device *nvdev;2524	int ret = -ENOMEM;2525 2526	net = alloc_etherdev_mq(sizeof(struct net_device_context),2527				VRSS_CHANNEL_MAX);2528	if (!net)2529		goto no_net;2530 2531	netif_carrier_off(net);2532 2533	netvsc_init_settings(net);2534 2535	net_device_ctx = netdev_priv(net);2536	net_device_ctx->device_ctx = dev;2537	net_device_ctx->msg_enable = netif_msg_init(debug, default_msg);2538	if (netif_msg_probe(net_device_ctx))2539		netdev_dbg(net, "netvsc msg_enable: %d\n",2540			   net_device_ctx->msg_enable);2541 2542	hv_set_drvdata(dev, net);2543 2544	INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);2545 2546	init_completion(&net_device_ctx->vf_add);2547	spin_lock_init(&net_device_ctx->lock);2548	INIT_LIST_HEAD(&net_device_ctx->reconfig_events);2549	INIT_DELAYED_WORK(&net_device_ctx->vf_takeover, netvsc_vf_setup);2550 2551	net_device_ctx->vf_stats2552		= netdev_alloc_pcpu_stats(struct netvsc_vf_pcpu_stats);2553	if (!net_device_ctx->vf_stats)2554		goto no_stats;2555 2556	net->netdev_ops = &device_ops;2557	net->ethtool_ops = &ethtool_ops;2558	SET_NETDEV_DEV(net, &dev->device);2559	dma_set_min_align_mask(&dev->device, HV_HYP_PAGE_SIZE - 1);2560 2561	/* We always need headroom for rndis header */2562	net->needed_headroom = RNDIS_AND_PPI_SIZE;2563 2564	/* Initialize the number of queues to be 1, we may change it if more2565	 * channels are offered later.2566	 */2567	netif_set_real_num_tx_queues(net, 1);2568	netif_set_real_num_rx_queues(net, 1);2569 2570	/* Notify the netvsc driver of the new device */2571	device_info = netvsc_devinfo_get(NULL);2572 2573	if (!device_info) {2574		ret = -ENOMEM;2575		goto devinfo_failed;2576	}2577 2578	/* We must get rtnl lock before scheduling nvdev->subchan_work,2579	 * otherwise netvsc_subchan_work() can get rtnl lock first and wait2580	 * all subchannels to show up, but that may not happen because2581	 * netvsc_probe() can't get rtnl lock and as a result vmbus_onoffer()2582	 * -> ... -> device_add() -> ... -> __device_attach() can't get2583	 * the device lock, so all the subchannels can't be processed --2584	 * finally netvsc_subchan_work() hangs forever.2585	 *2586	 * The rtnl lock also needs to be held before rndis_filter_device_add()2587	 * which advertises nvsp_2_vsc_capability / sriov bit, and triggers2588	 * VF NIC offering and registering. If VF NIC finished register_netdev()2589	 * earlier it may cause name based config failure.2590	 */2591	rtnl_lock();2592 2593	nvdev = rndis_filter_device_add(dev, device_info);2594	if (IS_ERR(nvdev)) {2595		ret = PTR_ERR(nvdev);2596		netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);2597		goto rndis_failed;2598	}2599 2600	eth_hw_addr_set(net, device_info->mac_adr);2601 2602	if (nvdev->num_chn > 1)2603		schedule_work(&nvdev->subchan_work);2604 2605	/* hw_features computed in rndis_netdev_set_hwcaps() */2606	net->features = net->hw_features |2607		NETIF_F_HIGHDMA | NETIF_F_HW_VLAN_CTAG_TX |2608		NETIF_F_HW_VLAN_CTAG_RX;2609	net->vlan_features = net->features;2610 2611	netdev_lockdep_set_classes(net);2612 2613	net->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |2614			    NETDEV_XDP_ACT_NDO_XMIT;2615 2616	/* MTU range: 68 - 1500 or 65521 */2617	net->min_mtu = NETVSC_MTU_MIN;2618	if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)2619		net->max_mtu = NETVSC_MTU - ETH_HLEN;2620	else2621		net->max_mtu = ETH_DATA_LEN;2622 2623	nvdev->tx_disable = false;2624 2625	ret = register_netdevice(net);2626	if (ret != 0) {2627		pr_err("Unable to register netdev.\n");2628		goto register_failed;2629	}2630 2631	list_add(&net_device_ctx->list, &netvsc_dev_list);2632 2633	/* When the hv_netvsc driver is unloaded and reloaded, the2634	 * NET_DEVICE_REGISTER for the vf device is replayed before probe2635	 * is complete. This is because register_netdevice_notifier() gets2636	 * registered before vmbus_driver_register() so that callback func2637	 * is set before probe and we don't miss events like NETDEV_POST_INIT2638	 * So, in this section we try to register the matching vf device that2639	 * is present as a netdevice, knowing that its register call is not2640	 * processed in the netvsc_netdev_notifier(as probing is progress and2641	 * get_netvsc_byslot fails).2642	 */2643	for_each_netdev(dev_net(net), vf_netdev) {2644		ret = check_dev_is_matching_vf(vf_netdev);2645		if (ret != 0)2646			continue;2647 2648		if (net != get_netvsc_byslot(vf_netdev))2649			continue;2650 2651		netvsc_prepare_bonding(vf_netdev);2652		netvsc_register_vf(vf_netdev, VF_REG_IN_PROBE);2653		__netvsc_vf_setup(net, vf_netdev);2654		break;2655	}2656	rtnl_unlock();2657 2658	netvsc_devinfo_put(device_info);2659	return 0;2660 2661register_failed:2662	rndis_filter_device_remove(dev, nvdev);2663rndis_failed:2664	rtnl_unlock();2665	netvsc_devinfo_put(device_info);2666devinfo_failed:2667	free_percpu(net_device_ctx->vf_stats);2668no_stats:2669	hv_set_drvdata(dev, NULL);2670	free_netdev(net);2671no_net:2672	return ret;2673}2674 2675static void netvsc_remove(struct hv_device *dev)2676{2677	struct net_device_context *ndev_ctx;2678	struct net_device *vf_netdev, *net;2679	struct netvsc_device *nvdev;2680 2681	net = hv_get_drvdata(dev);2682	if (net == NULL) {2683		dev_err(&dev->device, "No net device to remove\n");2684		return;2685	}2686 2687	ndev_ctx = netdev_priv(net);2688 2689	cancel_delayed_work_sync(&ndev_ctx->dwork);2690 2691	rtnl_lock();2692	nvdev = rtnl_dereference(ndev_ctx->nvdev);2693	if (nvdev) {2694		cancel_work_sync(&nvdev->subchan_work);2695		netvsc_xdp_set(net, NULL, NULL, nvdev);2696	}2697 2698	/*2699	 * Call to the vsc driver to let it know that the device is being2700	 * removed. Also blocks mtu and channel changes.2701	 */2702	vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);2703	if (vf_netdev)2704		netvsc_unregister_vf(vf_netdev);2705 2706	if (nvdev)2707		rndis_filter_device_remove(dev, nvdev);2708 2709	unregister_netdevice(net);2710	list_del(&ndev_ctx->list);2711 2712	rtnl_unlock();2713 2714	hv_set_drvdata(dev, NULL);2715 2716	free_percpu(ndev_ctx->vf_stats);2717	free_netdev(net);2718}2719 2720static int netvsc_suspend(struct hv_device *dev)2721{2722	struct net_device_context *ndev_ctx;2723	struct netvsc_device *nvdev;2724	struct net_device *net;2725	int ret;2726 2727	net = hv_get_drvdata(dev);2728 2729	ndev_ctx = netdev_priv(net);2730	cancel_delayed_work_sync(&ndev_ctx->dwork);2731 2732	rtnl_lock();2733 2734	nvdev = rtnl_dereference(ndev_ctx->nvdev);2735	if (nvdev == NULL) {2736		ret = -ENODEV;2737		goto out;2738	}2739 2740	/* Save the current config info */2741	ndev_ctx->saved_netvsc_dev_info = netvsc_devinfo_get(nvdev);2742	if (!ndev_ctx->saved_netvsc_dev_info) {2743		ret = -ENOMEM;2744		goto out;2745	}2746	ret = netvsc_detach(net, nvdev);2747out:2748	rtnl_unlock();2749 2750	return ret;2751}2752 2753static int netvsc_resume(struct hv_device *dev)2754{2755	struct net_device *net = hv_get_drvdata(dev);2756	struct net_device_context *net_device_ctx;2757	struct netvsc_device_info *device_info;2758	int ret;2759 2760	rtnl_lock();2761 2762	net_device_ctx = netdev_priv(net);2763 2764	/* Reset the data path to the netvsc NIC before re-opening the vmbus2765	 * channel. Later netvsc_netdev_event() will switch the data path to2766	 * the VF upon the UP or CHANGE event.2767	 */2768	net_device_ctx->data_path_is_vf = false;2769	device_info = net_device_ctx->saved_netvsc_dev_info;2770 2771	ret = netvsc_attach(net, device_info);2772 2773	netvsc_devinfo_put(device_info);2774	net_device_ctx->saved_netvsc_dev_info = NULL;2775 2776	rtnl_unlock();2777 2778	return ret;2779}2780static const struct hv_vmbus_device_id id_table[] = {2781	/* Network guid */2782	{ HV_NIC_GUID, },2783	{ },2784};2785 2786MODULE_DEVICE_TABLE(vmbus, id_table);2787 2788/* The one and only one */2789static struct  hv_driver netvsc_drv = {2790	.name = KBUILD_MODNAME,2791	.id_table = id_table,2792	.probe = netvsc_probe,2793	.remove = netvsc_remove,2794	.suspend = netvsc_suspend,2795	.resume = netvsc_resume,2796	.driver = {2797		.probe_type = PROBE_FORCE_SYNCHRONOUS,2798	},2799};2800 2801/* Set VF's namespace same as the synthetic NIC */2802static void netvsc_event_set_vf_ns(struct net_device *ndev)2803{2804	struct net_device_context *ndev_ctx = netdev_priv(ndev);2805	struct net_device *vf_netdev;2806	int ret;2807 2808	vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);2809	if (!vf_netdev)2810		return;2811 2812	if (!net_eq(dev_net(ndev), dev_net(vf_netdev))) {2813		ret = dev_change_net_namespace(vf_netdev, dev_net(ndev),2814					       "eth%d");2815		if (ret)2816			netdev_err(vf_netdev,2817				   "Cannot move to same namespace as %s: %d\n",2818				   ndev->name, ret);2819		else2820			netdev_info(vf_netdev,2821				    "Moved VF to namespace with: %s\n",2822				    ndev->name);2823	}2824}2825 2826/*2827 * On Hyper-V, every VF interface is matched with a corresponding2828 * synthetic interface. The synthetic interface is presented first2829 * to the guest. When the corresponding VF instance is registered,2830 * we will take care of switching the data path.2831 */2832static int netvsc_netdev_event(struct notifier_block *this,2833			       unsigned long event, void *ptr)2834{2835	struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);2836	int ret = 0;2837 2838	if (event_dev->netdev_ops == &device_ops && event == NETDEV_REGISTER) {2839		netvsc_event_set_vf_ns(event_dev);2840		return NOTIFY_DONE;2841	}2842 2843	ret = check_dev_is_matching_vf(event_dev);2844	if (ret != 0)2845		return NOTIFY_DONE;2846 2847	switch (event) {2848	case NETDEV_POST_INIT:2849		return netvsc_prepare_bonding(event_dev);2850	case NETDEV_REGISTER:2851		return netvsc_register_vf(event_dev, VF_REG_IN_NOTIFIER);2852	case NETDEV_UNREGISTER:2853		return netvsc_unregister_vf(event_dev);2854	case NETDEV_UP:2855	case NETDEV_DOWN:2856	case NETDEV_CHANGE:2857	case NETDEV_GOING_DOWN:2858		return netvsc_vf_changed(event_dev, event);2859	default:2860		return NOTIFY_DONE;2861	}2862}2863 2864static struct notifier_block netvsc_netdev_notifier = {2865	.notifier_call = netvsc_netdev_event,2866};2867 2868static void __exit netvsc_drv_exit(void)2869{2870	unregister_netdevice_notifier(&netvsc_netdev_notifier);2871	vmbus_driver_unregister(&netvsc_drv);2872}2873 2874static int __init netvsc_drv_init(void)2875{2876	int ret;2877 2878	if (ring_size < RING_SIZE_MIN) {2879		ring_size = RING_SIZE_MIN;2880		pr_info("Increased ring_size to %u (min allowed)\n",2881			ring_size);2882	}2883	netvsc_ring_bytes = VMBUS_RING_SIZE(ring_size * 4096);2884 2885	register_netdevice_notifier(&netvsc_netdev_notifier);2886 2887	ret = vmbus_driver_register(&netvsc_drv);2888	if (ret)2889		goto err_vmbus_reg;2890 2891	return 0;2892 2893err_vmbus_reg:2894	unregister_netdevice_notifier(&netvsc_netdev_notifier);2895	return ret;2896}2897 2898MODULE_LICENSE("GPL");2899MODULE_DESCRIPTION("Microsoft Hyper-V network driver");2900 2901module_init(netvsc_drv_init);2902module_exit(netvsc_drv_exit);2903