rxe_net.c

  1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
  2/*
  3 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
  4 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
  5 */
  6
  7#include <linux/skbuff.h>
  8#include <linux/if_arp.h>
  9#include <linux/netdevice.h>
 10#include <linux/if.h>
 11#include <linux/if_vlan.h>
 12#include <net/udp_tunnel.h>
 13#include <net/sch_generic.h>
 14#include <linux/netfilter.h>
 15#include <rdma/ib_addr.h>
 16
 17#include "rxe.h"
 18#include "rxe_net.h"
 19#include "rxe_loc.h"
 20
 21static struct rxe_recv_sockets recv_sockets;
 22
 23#ifdef CONFIG_DEBUG_LOCK_ALLOC
 24/*
 25 * lockdep can detect false positive circular dependencies
 26 * when there are user-space socket API users or in kernel
 27 * users switching between a tcp and rdma transport.
 28 * Maybe also switching between siw and rxe may cause
 29 * problems as per default sockets are only classified
 30 * by family and not by ip protocol. And there might
 31 * be different locks used between the application
 32 * and the low level sockets.
 33 *
 34 * Problems were seen with ksmbd.ko and cifs.ko,
 35 * switching transports, use git blame to find
 36 * more details.
 37 */
 38static struct lock_class_key rxe_recv_sk_key[2];
 39static struct lock_class_key rxe_recv_slock_key[2];
 40#endif /* CONFIG_DEBUG_LOCK_ALLOC */
 41
 42static inline void rxe_reclassify_recv_socket(struct socket *sock)
 43{
 44#ifdef CONFIG_DEBUG_LOCK_ALLOC
 45	struct sock *sk = sock->sk;
 46
 47	if (WARN_ON_ONCE(!sock_allow_reclassification(sk)))
 48		return;
 49
 50	switch (sk->sk_family) {
 51	case AF_INET:
 52		sock_lock_init_class_and_name(sk,
 53					      "slock-AF_INET-RDMA-RXE-RECV",
 54					      &rxe_recv_slock_key[0],
 55					      "sk_lock-AF_INET-RDMA-RXE-RECV",
 56					      &rxe_recv_sk_key[0]);
 57		break;
 58	case AF_INET6:
 59		sock_lock_init_class_and_name(sk,
 60					      "slock-AF_INET6-RDMA-RXE-RECV",
 61					      &rxe_recv_slock_key[1],
 62					      "sk_lock-AF_INET6-RDMA-RXE-RECV",
 63					      &rxe_recv_sk_key[1]);
 64		break;
 65	default:
 66		WARN_ON_ONCE(1);
 67		return;
 68	}
 69	/*
 70	 * sock_lock_init_class_and_name() calls
 71	 * sk_owner_set(sk, THIS_MODULE); in order
 72	 * to make sure the referenced global
 73	 * variables rxe_recv_slock_key and
 74	 * rxe_recv_sk_key are not removed
 75	 * before the socket is closed.
 76	 *
 77	 * However this prevents rxe_net_exit()
 78	 * from being called and 'rmmod rdma_rxe'
 79	 * is refused because of the references.
 80	 *
 81	 * For the global sockets in recv_sockets,
 82	 * we are sure that rxe_net_exit() will call
 83	 * rxe_release_udp_tunnel -> udp_tunnel_sock_release.
 84	 *
 85	 * So we don't need the additional reference to
 86	 * our own (THIS_MODULE).
 87	 */
 88	sk_owner_put(sk);
 89	/*
 90	 * We also call sk_owner_clear() otherwise
 91	 * sk_owner_put(sk) in sk_prot_free will
 92	 * fail, which is called via
 93	 * sk_free -> __sk_free -> sk_destruct
 94	 * and sk_destruct calls __sk_destruct
 95	 * directly or via call_rcu()
 96	 * so sk_prot_free() might be called
 97	 * after rxe_net_exit().
 98	 */
 99	sk_owner_clear(sk);
100#endif /* CONFIG_DEBUG_LOCK_ALLOC */
101}
102
103static struct dst_entry *rxe_find_route4(struct rxe_qp *qp,
104					 struct net_device *ndev,
105					 struct in_addr *saddr,
106					 struct in_addr *daddr)
107{
108	struct rtable *rt;
109	struct flowi4 fl = { { 0 } };
110
111	memset(&fl, 0, sizeof(fl));
112	fl.flowi4_oif = ndev->ifindex;
113	memcpy(&fl.saddr, saddr, sizeof(*saddr));
114	memcpy(&fl.daddr, daddr, sizeof(*daddr));
115	fl.flowi4_proto = IPPROTO_UDP;
116
117	rt = ip_route_output_key(&init_net, &fl);
118	if (IS_ERR(rt)) {
119		rxe_dbg_qp(qp, "no route to %pI4\n", &daddr->s_addr);
120		return NULL;
121	}
122
123	return &rt->dst;
124}
125
126#if IS_ENABLED(CONFIG_IPV6)
127static struct dst_entry *rxe_find_route6(struct rxe_qp *qp,
128					 struct net_device *ndev,
129					 struct in6_addr *saddr,
130					 struct in6_addr *daddr)
131{
132	struct dst_entry *ndst;
133	struct flowi6 fl6 = { { 0 } };
134
135	memset(&fl6, 0, sizeof(fl6));
136	fl6.flowi6_oif = ndev->ifindex;
137	memcpy(&fl6.saddr, saddr, sizeof(*saddr));
138	memcpy(&fl6.daddr, daddr, sizeof(*daddr));
139	fl6.flowi6_proto = IPPROTO_UDP;
140
141	ndst = ipv6_stub->ipv6_dst_lookup_flow(sock_net(recv_sockets.sk6->sk),
142					       recv_sockets.sk6->sk, &fl6,
143					       NULL);
144	if (IS_ERR(ndst)) {
145		rxe_dbg_qp(qp, "no route to %pI6\n", daddr);
146		return NULL;
147	}
148
149	if (unlikely(ndst->error)) {
150		rxe_dbg_qp(qp, "no route to %pI6\n", daddr);
151		goto put;
152	}
153
154	return ndst;
155put:
156	dst_release(ndst);
157	return NULL;
158}
159
160#else
161
162static struct dst_entry *rxe_find_route6(struct rxe_qp *qp,
163					 struct net_device *ndev,
164					 struct in6_addr *saddr,
165					 struct in6_addr *daddr)
166{
167	return NULL;
168}
169
170#endif
171
172static struct dst_entry *rxe_find_route(struct net_device *ndev,
173					struct rxe_qp *qp,
174					struct rxe_av *av)
175{
176	struct dst_entry *dst = NULL;
177
178	if (qp_type(qp) == IB_QPT_RC)
179		dst = sk_dst_get(qp->sk->sk);
180
181	if (!dst || !dst_check(dst, qp->dst_cookie)) {
182		if (dst)
183			dst_release(dst);
184
185		if (av->network_type == RXE_NETWORK_TYPE_IPV4) {
186			struct in_addr *saddr;
187			struct in_addr *daddr;
188
189			saddr = &av->sgid_addr._sockaddr_in.sin_addr;
190			daddr = &av->dgid_addr._sockaddr_in.sin_addr;
191			dst = rxe_find_route4(qp, ndev, saddr, daddr);
192		} else if (av->network_type == RXE_NETWORK_TYPE_IPV6) {
193			struct in6_addr *saddr6;
194			struct in6_addr *daddr6;
195
196			saddr6 = &av->sgid_addr._sockaddr_in6.sin6_addr;
197			daddr6 = &av->dgid_addr._sockaddr_in6.sin6_addr;
198			dst = rxe_find_route6(qp, ndev, saddr6, daddr6);
199#if IS_ENABLED(CONFIG_IPV6)
200			if (dst)
201				qp->dst_cookie =
202					rt6_get_cookie((struct rt6_info *)dst);
203#endif
204		}
205
206		if (dst && (qp_type(qp) == IB_QPT_RC)) {
207			dst_hold(dst);
208			sk_dst_set(qp->sk->sk, dst);
209		}
210	}
211	return dst;
212}
213
214static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
215{
216	struct udphdr *udph;
217	struct rxe_dev *rxe;
218	struct net_device *ndev = skb->dev;
219	struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
220
221	/* takes a reference on rxe->ib_dev
222	 * drop when skb is freed
223	 */
224	rxe = rxe_get_dev_from_net(ndev);
225	if (!rxe && is_vlan_dev(ndev))
226		rxe = rxe_get_dev_from_net(vlan_dev_real_dev(ndev));
227	if (!rxe)
228		goto drop;
229
230	if (skb_linearize(skb)) {
231		ib_device_put(&rxe->ib_dev);
232		goto drop;
233	}
234
235	udph = udp_hdr(skb);
236	pkt->rxe = rxe;
237	pkt->port_num = 1;
238	pkt->hdr = (u8 *)(udph + 1);
239	pkt->mask = RXE_GRH_MASK;
240	pkt->paylen = be16_to_cpu(udph->len) - sizeof(*udph);
241
242	/* remove udp header */
243	skb_pull(skb, sizeof(struct udphdr));
244
245	rxe_rcv(skb);
246
247	return 0;
248drop:
249	kfree_skb(skb);
250
251	return 0;
252}
253
254static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port,
255					   bool ipv6)
256{
257	int err;
258	struct socket *sock;
259	struct udp_port_cfg udp_cfg = { };
260	struct udp_tunnel_sock_cfg tnl_cfg = { };
261
262	if (ipv6) {
263		udp_cfg.family = AF_INET6;
264		udp_cfg.ipv6_v6only = 1;
265	} else {
266		udp_cfg.family = AF_INET;
267	}
268
269	udp_cfg.local_udp_port = port;
270
271	/* Create UDP socket */
272	err = udp_sock_create(net, &udp_cfg, &sock);
273	if (err < 0)
274		return ERR_PTR(err);
275	rxe_reclassify_recv_socket(sock);
276
277	tnl_cfg.encap_type = 1;
278	tnl_cfg.encap_rcv = rxe_udp_encap_recv;
279
280	/* Setup UDP tunnel */
281	setup_udp_tunnel_sock(net, sock, &tnl_cfg);
282
283	return sock;
284}
285
286static void rxe_release_udp_tunnel(struct socket *sk)
287{
288	if (sk)
289		udp_tunnel_sock_release(sk);
290}
291
292static void prepare_udp_hdr(struct sk_buff *skb, __be16 src_port,
293			    __be16 dst_port)
294{
295	struct udphdr *udph;
296
297	__skb_push(skb, sizeof(*udph));
298	skb_reset_transport_header(skb);
299	udph = udp_hdr(skb);
300
301	udph->dest = dst_port;
302	udph->source = src_port;
303	udph->len = htons(skb->len);
304	udph->check = 0;
305}
306
307static void prepare_ipv4_hdr(struct dst_entry *dst, struct sk_buff *skb,
308			     __be32 saddr, __be32 daddr, __u8 proto,
309			     __u8 tos, __u8 ttl, __be16 df, bool xnet)
310{
311	struct iphdr *iph;
312
313	skb_scrub_packet(skb, xnet);
314
315	skb_clear_hash(skb);
316	skb_dst_set(skb, dst_clone(dst));
317	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
318
319	skb_push(skb, sizeof(struct iphdr));
320	skb_reset_network_header(skb);
321
322	iph = ip_hdr(skb);
323
324	iph->version	=	IPVERSION;
325	iph->ihl	=	sizeof(struct iphdr) >> 2;
326	iph->tot_len	=	htons(skb->len);
327	iph->frag_off	=	df;
328	iph->protocol	=	proto;
329	iph->tos	=	tos;
330	iph->daddr	=	daddr;
331	iph->saddr	=	saddr;
332	iph->ttl	=	ttl;
333	__ip_select_ident(dev_net(dst->dev), iph,
334			  skb_shinfo(skb)->gso_segs ?: 1);
335}
336
337static void prepare_ipv6_hdr(struct dst_entry *dst, struct sk_buff *skb,
338			     struct in6_addr *saddr, struct in6_addr *daddr,
339			     __u8 proto, __u8 prio, __u8 ttl)
340{
341	struct ipv6hdr *ip6h;
342
343	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
344	IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED
345			    | IPSKB_REROUTED);
346	skb_dst_set(skb, dst_clone(dst));
347
348	__skb_push(skb, sizeof(*ip6h));
349	skb_reset_network_header(skb);
350	ip6h		  = ipv6_hdr(skb);
351	ip6_flow_hdr(ip6h, prio, htonl(0));
352	ip6h->payload_len = htons(skb->len);
353	ip6h->nexthdr     = proto;
354	ip6h->hop_limit   = ttl;
355	ip6h->daddr	  = *daddr;
356	ip6h->saddr	  = *saddr;
357	ip6h->payload_len = htons(skb->len - sizeof(*ip6h));
358}
359
360static int prepare4(struct rxe_av *av, struct rxe_pkt_info *pkt,
361		    struct sk_buff *skb)
362{
363	struct rxe_qp *qp = pkt->qp;
364	struct dst_entry *dst;
365	bool xnet = false;
366	__be16 df = htons(IP_DF);
367	struct in_addr *saddr = &av->sgid_addr._sockaddr_in.sin_addr;
368	struct in_addr *daddr = &av->dgid_addr._sockaddr_in.sin_addr;
369
370	dst = rxe_find_route(skb->dev, qp, av);
371	if (!dst) {
372		rxe_dbg_qp(qp, "Host not reachable\n");
373		return -EHOSTUNREACH;
374	}
375
376	prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
377			cpu_to_be16(ROCE_V2_UDP_DPORT));
378
379	prepare_ipv4_hdr(dst, skb, saddr->s_addr, daddr->s_addr, IPPROTO_UDP,
380			 av->grh.traffic_class, av->grh.hop_limit, df, xnet);
381
382	dst_release(dst);
383	return 0;
384}
385
386static int prepare6(struct rxe_av *av, struct rxe_pkt_info *pkt,
387		    struct sk_buff *skb)
388{
389	struct rxe_qp *qp = pkt->qp;
390	struct dst_entry *dst;
391	struct in6_addr *saddr = &av->sgid_addr._sockaddr_in6.sin6_addr;
392	struct in6_addr *daddr = &av->dgid_addr._sockaddr_in6.sin6_addr;
393
394	dst = rxe_find_route(skb->dev, qp, av);
395	if (!dst) {
396		rxe_dbg_qp(qp, "Host not reachable\n");
397		return -EHOSTUNREACH;
398	}
399
400	prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
401			cpu_to_be16(ROCE_V2_UDP_DPORT));
402
403	prepare_ipv6_hdr(dst, skb, saddr, daddr, IPPROTO_UDP,
404			 av->grh.traffic_class,
405			 av->grh.hop_limit);
406
407	dst_release(dst);
408	return 0;
409}
410
411int rxe_prepare(struct rxe_av *av, struct rxe_pkt_info *pkt,
412		struct sk_buff *skb)
413{
414	int err = 0;
415
416	if (skb->protocol == htons(ETH_P_IP))
417		err = prepare4(av, pkt, skb);
418	else if (skb->protocol == htons(ETH_P_IPV6))
419		err = prepare6(av, pkt, skb);
420
421	if (ether_addr_equal(skb->dev->dev_addr, av->dmac))
422		pkt->mask |= RXE_LOOPBACK_MASK;
423
424	return err;
425}
426
427static void rxe_skb_tx_dtor(struct sk_buff *skb)
428{
429	struct rxe_qp *qp = skb->sk->sk_user_data;
430	int skb_out;
431
432	skb_out = atomic_dec_return(&qp->skb_out);
433	if (unlikely(qp->need_req_skb &&
434		skb_out < RXE_INFLIGHT_SKBS_PER_QP_LOW))
435		rxe_sched_task(&qp->send_task);
436
437	rxe_put(qp);
438	sock_put(skb->sk);
439}
440
441static int rxe_send(struct sk_buff *skb, struct rxe_pkt_info *pkt)
442{
443	int err;
444	struct sock *sk = pkt->qp->sk->sk;
445
446	sock_hold(sk);
447	skb->sk = sk;
448	skb->destructor = rxe_skb_tx_dtor;
449	rxe_get(pkt->qp);
450	atomic_inc(&pkt->qp->skb_out);
451
452	if (skb->protocol == htons(ETH_P_IP))
453		err = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
454	else
455		err = ip6_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
456
457	return err;
458}
459
460/* fix up a send packet to match the packets
461 * received from UDP before looping them back
462 */
463static int rxe_loopback(struct sk_buff *skb, struct rxe_pkt_info *pkt)
464{
465	struct sock *sk = pkt->qp->sk->sk;
466
467	memcpy(SKB_TO_PKT(skb), pkt, sizeof(*pkt));
468
469	sock_hold(sk);
470	skb->sk = sk;
471	skb->destructor = rxe_skb_tx_dtor;
472	rxe_get(pkt->qp);
473	atomic_inc(&pkt->qp->skb_out);
474
475	if (skb->protocol == htons(ETH_P_IP))
476		skb_pull(skb, sizeof(struct iphdr));
477	else
478		skb_pull(skb, sizeof(struct ipv6hdr));
479
480	if (WARN_ON(!ib_device_try_get(&pkt->rxe->ib_dev))) {
481		kfree_skb(skb);
482		return -EIO;
483	}
484
485	/* remove udp header */
486	skb_pull(skb, sizeof(struct udphdr));
487
488	rxe_rcv(skb);
489
490	return 0;
491}
492
493int rxe_xmit_packet(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
494		    struct sk_buff *skb)
495{
496	int err;
497	int is_request = pkt->mask & RXE_REQ_MASK;
498	struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
499	unsigned long flags;
500
501	spin_lock_irqsave(&qp->state_lock, flags);
502	if ((is_request && (qp_state(qp) < IB_QPS_RTS)) ||
503	    (!is_request && (qp_state(qp) < IB_QPS_RTR))) {
504		spin_unlock_irqrestore(&qp->state_lock, flags);
505		rxe_dbg_qp(qp, "Packet dropped. QP is not in ready state\n");
506		goto drop;
507	}
508	spin_unlock_irqrestore(&qp->state_lock, flags);
509
510	rxe_icrc_generate(skb, pkt);
511
512	if (pkt->mask & RXE_LOOPBACK_MASK)
513		err = rxe_loopback(skb, pkt);
514	else
515		err = rxe_send(skb, pkt);
516	if (err) {
517		rxe_counter_inc(rxe, RXE_CNT_SEND_ERR);
518		return err;
519	}
520
521	rxe_counter_inc(rxe, RXE_CNT_SENT_PKTS);
522	goto done;
523
524drop:
525	kfree_skb(skb);
526	err = 0;
527done:
528	return err;
529}
530
531struct sk_buff *rxe_init_packet(struct rxe_dev *rxe, struct rxe_av *av,
532				int paylen, struct rxe_pkt_info *pkt)
533{
534	unsigned int hdr_len;
535	struct sk_buff *skb = NULL;
536	struct net_device *ndev;
537	const struct ib_gid_attr *attr;
538	const int port_num = 1;
539
540	attr = rdma_get_gid_attr(&rxe->ib_dev, port_num, av->grh.sgid_index);
541	if (IS_ERR(attr))
542		return NULL;
543
544	if (av->network_type == RXE_NETWORK_TYPE_IPV4)
545		hdr_len = ETH_HLEN + sizeof(struct udphdr) +
546			sizeof(struct iphdr);
547	else
548		hdr_len = ETH_HLEN + sizeof(struct udphdr) +
549			sizeof(struct ipv6hdr);
550
551	rcu_read_lock();
552	ndev = rdma_read_gid_attr_ndev_rcu(attr);
553	if (IS_ERR(ndev)) {
554		rcu_read_unlock();
555		goto out;
556	}
557	skb = alloc_skb(paylen + hdr_len + LL_RESERVED_SPACE(ndev),
558			GFP_ATOMIC);
559
560	if (unlikely(!skb)) {
561		rcu_read_unlock();
562		goto out;
563	}
564
565	/* Add time stamp to skb. */
566	skb->tstamp = ktime_get();
567
568	skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(ndev));
569
570	/* FIXME: hold reference to this netdev until life of this skb. */
571	skb->dev	= ndev;
572	rcu_read_unlock();
573
574	if (av->network_type == RXE_NETWORK_TYPE_IPV4)
575		skb->protocol = htons(ETH_P_IP);
576	else
577		skb->protocol = htons(ETH_P_IPV6);
578
579	pkt->rxe	= rxe;
580	pkt->port_num	= port_num;
581	pkt->hdr	= skb_put(skb, paylen);
582	pkt->mask	|= RXE_GRH_MASK;
583
584out:
585	rdma_put_gid_attr(attr);
586	return skb;
587}
588
589/*
590 * this is required by rxe_cfg to match rxe devices in
591 * /sys/class/infiniband up with their underlying ethernet devices
592 */
593const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num)
594{
595	struct net_device *ndev;
596	char *ndev_name;
597
598	ndev = rxe_ib_device_get_netdev(&rxe->ib_dev);
599	if (!ndev)
600		return NULL;
601	ndev_name = ndev->name;
602	dev_put(ndev);
603
604	return ndev_name;
605}
606
607int rxe_net_add(const char *ibdev_name, struct net_device *ndev)
608{
609	int err;
610	struct rxe_dev *rxe = NULL;
611
612	rxe = ib_alloc_device(rxe_dev, ib_dev);
613	if (!rxe)
614		return -ENOMEM;
615
616	ib_mark_name_assigned_by_user(&rxe->ib_dev);
617
618	err = rxe_add(rxe, ndev->mtu, ibdev_name, ndev);
619	if (err) {
620		ib_dealloc_device(&rxe->ib_dev);
621		return err;
622	}
623
624	return 0;
625}
626
627static void rxe_port_event(struct rxe_dev *rxe,
628			   enum ib_event_type event)
629{
630	struct ib_event ev;
631
632	ev.device = &rxe->ib_dev;
633	ev.element.port_num = 1;
634	ev.event = event;
635
636	ib_dispatch_event(&ev);
637}
638
639/* Caller must hold net_info_lock */
640void rxe_port_up(struct rxe_dev *rxe)
641{
642	rxe_port_event(rxe, IB_EVENT_PORT_ACTIVE);
643	dev_info(&rxe->ib_dev.dev, "set active\n");
644}
645
646/* Caller must hold net_info_lock */
647void rxe_port_down(struct rxe_dev *rxe)
648{
649	rxe_port_event(rxe, IB_EVENT_PORT_ERR);
650	rxe_counter_inc(rxe, RXE_CNT_LINK_DOWNED);
651	dev_info(&rxe->ib_dev.dev, "set down\n");
652}
653
654void rxe_set_port_state(struct rxe_dev *rxe)
655{
656	struct net_device *ndev;
657
658	ndev = rxe_ib_device_get_netdev(&rxe->ib_dev);
659	if (!ndev)
660		return;
661
662	if (ib_get_curr_port_state(ndev) == IB_PORT_ACTIVE)
663		rxe_port_up(rxe);
664	else
665		rxe_port_down(rxe);
666
667	dev_put(ndev);
668}
669
670static int rxe_notify(struct notifier_block *not_blk,
671		      unsigned long event,
672		      void *arg)
673{
674	struct net_device *ndev = netdev_notifier_info_to_dev(arg);
675	struct rxe_dev *rxe = rxe_get_dev_from_net(ndev);
676
677	if (!rxe)
678		return NOTIFY_OK;
679
680	switch (event) {
681	case NETDEV_UNREGISTER:
682		ib_unregister_device_queued(&rxe->ib_dev);
683		break;
684	case NETDEV_CHANGEMTU:
685		rxe_dbg_dev(rxe, "%s changed mtu to %d\n", ndev->name, ndev->mtu);
686		rxe_set_mtu(rxe, ndev->mtu);
687		break;
688	case NETDEV_DOWN:
689	case NETDEV_CHANGE:
690		if (ib_get_curr_port_state(ndev) == IB_PORT_DOWN)
691			rxe_counter_inc(rxe, RXE_CNT_LINK_DOWNED);
692		break;
693	case NETDEV_REBOOT:
694	case NETDEV_GOING_DOWN:
695	case NETDEV_CHANGEADDR:
696	case NETDEV_CHANGENAME:
697	case NETDEV_FEAT_CHANGE:
698	default:
699		rxe_dbg_dev(rxe, "ignoring netdev event = %ld for %s\n",
700			event, ndev->name);
701		break;
702	}
703
704	ib_device_put(&rxe->ib_dev);
705	return NOTIFY_OK;
706}
707
708static struct notifier_block rxe_net_notifier = {
709	.notifier_call = rxe_notify,
710};
711
712static int rxe_net_ipv4_init(void)
713{
714	recv_sockets.sk4 = rxe_setup_udp_tunnel(&init_net,
715				htons(ROCE_V2_UDP_DPORT), false);
716	if (IS_ERR(recv_sockets.sk4)) {
717		recv_sockets.sk4 = NULL;
718		pr_err("Failed to create IPv4 UDP tunnel\n");
719		return -1;
720	}
721
722	return 0;
723}
724
725static int rxe_net_ipv6_init(void)
726{
727#if IS_ENABLED(CONFIG_IPV6)
728
729	recv_sockets.sk6 = rxe_setup_udp_tunnel(&init_net,
730						htons(ROCE_V2_UDP_DPORT), true);
731	if (PTR_ERR(recv_sockets.sk6) == -EAFNOSUPPORT) {
732		recv_sockets.sk6 = NULL;
733		pr_warn("IPv6 is not supported, can not create a UDPv6 socket\n");
734		return 0;
735	}
736
737	if (IS_ERR(recv_sockets.sk6)) {
738		recv_sockets.sk6 = NULL;
739		pr_err("Failed to create IPv6 UDP tunnel\n");
740		return -1;
741	}
742#endif
743	return 0;
744}
745
746void rxe_net_exit(void)
747{
748	rxe_release_udp_tunnel(recv_sockets.sk6);
749	rxe_release_udp_tunnel(recv_sockets.sk4);
750	unregister_netdevice_notifier(&rxe_net_notifier);
751}
752
753int rxe_net_init(void)
754{
755	int err;
756
757	recv_sockets.sk6 = NULL;
758
759	err = rxe_net_ipv4_init();
760	if (err)
761		return err;
762	err = rxe_net_ipv6_init();
763	if (err)
764		goto err_out;
765	err = register_netdevice_notifier(&rxe_net_notifier);
766	if (err) {
767		pr_err("Failed to register netdev notifier\n");
768		goto err_out;
769	}
770	return 0;
771err_out:
772	rxe_net_exit();
773	return err;
774}