1 /*
2  * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
3  * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
4  *
5  * This software is available to you under a choice of one of two
6  * licenses.  You may choose to be licensed under the terms of the GNU
7  * General Public License (GPL) Version 2, available from the file
8  * COPYING in the main directory of this source tree, or the
9  * OpenIB.org BSD license below:
10  *
11  *     Redistribution and use in source and binary forms, with or
12  *     without modification, are permitted provided that the following
13  *     conditions are met:
14  *
15  *	- Redistributions of source code must retain the above
16  *	  copyright notice, this list of conditions and the following
17  *	  disclaimer.
18  *
19  *	- Redistributions in binary form must reproduce the above
20  *	  copyright notice, this list of conditions and the following
21  *	  disclaimer in the documentation and/or other materials
22  *	  provided with the distribution.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31  * SOFTWARE.
32  */
33 
34 #include <linux/skbuff.h>
35 #include <linux/if_arp.h>
36 #include <linux/netdevice.h>
37 #include <linux/if.h>
38 #include <linux/if_vlan.h>
39 #include <net/udp_tunnel.h>
40 #include <net/sch_generic.h>
41 #include <linux/netfilter.h>
42 #include <rdma/ib_addr.h>
43 
44 #include "rxe.h"
45 #include "rxe_net.h"
46 #include "rxe_loc.h"
47 
48 static LIST_HEAD(rxe_dev_list);
49 static DEFINE_SPINLOCK(dev_list_lock); /* spinlock for device list */
50 
51 struct rxe_dev *net_to_rxe(struct net_device *ndev)
52 {
53 	struct rxe_dev *rxe;
54 	struct rxe_dev *found = NULL;
55 
56 	spin_lock_bh(&dev_list_lock);
57 	list_for_each_entry(rxe, &rxe_dev_list, list) {
58 		if (rxe->ndev == ndev) {
59 			found = rxe;
60 			break;
61 		}
62 	}
63 	spin_unlock_bh(&dev_list_lock);
64 
65 	return found;
66 }
67 
68 struct rxe_dev *get_rxe_by_name(const char *name)
69 {
70 	struct rxe_dev *rxe;
71 	struct rxe_dev *found = NULL;
72 
73 	spin_lock_bh(&dev_list_lock);
74 	list_for_each_entry(rxe, &rxe_dev_list, list) {
75 		if (!strcmp(name, rxe->ib_dev.name)) {
76 			found = rxe;
77 			break;
78 		}
79 	}
80 	spin_unlock_bh(&dev_list_lock);
81 	return found;
82 }
83 
84 
85 struct rxe_recv_sockets recv_sockets;
86 
87 static __be64 rxe_mac_to_eui64(struct net_device *ndev)
88 {
89 	unsigned char *mac_addr = ndev->dev_addr;
90 	__be64 eui64;
91 	unsigned char *dst = (unsigned char *)&eui64;
92 
93 	dst[0] = mac_addr[0] ^ 2;
94 	dst[1] = mac_addr[1];
95 	dst[2] = mac_addr[2];
96 	dst[3] = 0xff;
97 	dst[4] = 0xfe;
98 	dst[5] = mac_addr[3];
99 	dst[6] = mac_addr[4];
100 	dst[7] = mac_addr[5];
101 
102 	return eui64;
103 }
104 
105 __be64 rxe_node_guid(struct rxe_dev *rxe)
106 {
107 	return rxe_mac_to_eui64(rxe->ndev);
108 }
109 
110 __be64 rxe_port_guid(struct rxe_dev *rxe)
111 {
112 	return rxe_mac_to_eui64(rxe->ndev);
113 }
114 
115 struct device *rxe_dma_device(struct rxe_dev *rxe)
116 {
117 	struct net_device *ndev;
118 
119 	ndev = rxe->ndev;
120 
121 	if (is_vlan_dev(ndev))
122 		ndev = vlan_dev_real_dev(ndev);
123 
124 	return ndev->dev.parent;
125 }
126 
127 int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid)
128 {
129 	int err;
130 	unsigned char ll_addr[ETH_ALEN];
131 
132 	ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr);
133 	err = dev_mc_add(rxe->ndev, ll_addr);
134 
135 	return err;
136 }
137 
138 int rxe_mcast_delete(struct rxe_dev *rxe, union ib_gid *mgid)
139 {
140 	int err;
141 	unsigned char ll_addr[ETH_ALEN];
142 
143 	ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr);
144 	err = dev_mc_del(rxe->ndev, ll_addr);
145 
146 	return err;
147 }
148 
149 static struct dst_entry *rxe_find_route4(struct net_device *ndev,
150 				  struct in_addr *saddr,
151 				  struct in_addr *daddr)
152 {
153 	struct rtable *rt;
154 	struct flowi4 fl = { { 0 } };
155 
156 	memset(&fl, 0, sizeof(fl));
157 	fl.flowi4_oif = ndev->ifindex;
158 	memcpy(&fl.saddr, saddr, sizeof(*saddr));
159 	memcpy(&fl.daddr, daddr, sizeof(*daddr));
160 	fl.flowi4_proto = IPPROTO_UDP;
161 
162 	rt = ip_route_output_key(&init_net, &fl);
163 	if (IS_ERR(rt)) {
164 		pr_err_ratelimited("no route to %pI4\n", &daddr->s_addr);
165 		return NULL;
166 	}
167 
168 	return &rt->dst;
169 }
170 
171 #if IS_ENABLED(CONFIG_IPV6)
172 static struct dst_entry *rxe_find_route6(struct net_device *ndev,
173 					 struct in6_addr *saddr,
174 					 struct in6_addr *daddr)
175 {
176 	struct dst_entry *ndst;
177 	struct flowi6 fl6 = { { 0 } };
178 
179 	memset(&fl6, 0, sizeof(fl6));
180 	fl6.flowi6_oif = ndev->ifindex;
181 	memcpy(&fl6.saddr, saddr, sizeof(*saddr));
182 	memcpy(&fl6.daddr, daddr, sizeof(*daddr));
183 	fl6.flowi6_proto = IPPROTO_UDP;
184 
185 	if (unlikely(ipv6_stub->ipv6_dst_lookup(sock_net(recv_sockets.sk6->sk),
186 						recv_sockets.sk6->sk, &ndst, &fl6))) {
187 		pr_err_ratelimited("no route to %pI6\n", daddr);
188 		goto put;
189 	}
190 
191 	if (unlikely(ndst->error)) {
192 		pr_err("no route to %pI6\n", daddr);
193 		goto put;
194 	}
195 
196 	return ndst;
197 put:
198 	dst_release(ndst);
199 	return NULL;
200 }
201 
202 #else
203 
204 static struct dst_entry *rxe_find_route6(struct net_device *ndev,
205 					 struct in6_addr *saddr,
206 					 struct in6_addr *daddr)
207 {
208 	return NULL;
209 }
210 
211 #endif
212 
213 static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
214 {
215 	struct udphdr *udph;
216 	struct net_device *ndev = skb->dev;
217 	struct rxe_dev *rxe = net_to_rxe(ndev);
218 	struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
219 
220 	if (!rxe)
221 		goto drop;
222 
223 	if (skb_linearize(skb)) {
224 		pr_err("skb_linearize failed\n");
225 		goto drop;
226 	}
227 
228 	udph = udp_hdr(skb);
229 	pkt->rxe = rxe;
230 	pkt->port_num = 1;
231 	pkt->hdr = (u8 *)(udph + 1);
232 	pkt->mask = RXE_GRH_MASK;
233 	pkt->paylen = be16_to_cpu(udph->len) - sizeof(*udph);
234 
235 	return rxe_rcv(skb);
236 drop:
237 	kfree_skb(skb);
238 	return 0;
239 }
240 
241 static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port,
242 					   bool ipv6)
243 {
244 	int err;
245 	struct socket *sock;
246 	struct udp_port_cfg udp_cfg = { };
247 	struct udp_tunnel_sock_cfg tnl_cfg = { };
248 
249 	if (ipv6) {
250 		udp_cfg.family = AF_INET6;
251 		udp_cfg.ipv6_v6only = 1;
252 	} else {
253 		udp_cfg.family = AF_INET;
254 	}
255 
256 	udp_cfg.local_udp_port = port;
257 
258 	/* Create UDP socket */
259 	err = udp_sock_create(net, &udp_cfg, &sock);
260 	if (err < 0) {
261 		pr_err("failed to create udp socket. err = %d\n", err);
262 		return ERR_PTR(err);
263 	}
264 
265 	tnl_cfg.encap_type = 1;
266 	tnl_cfg.encap_rcv = rxe_udp_encap_recv;
267 
268 	/* Setup UDP tunnel */
269 	setup_udp_tunnel_sock(net, sock, &tnl_cfg);
270 
271 	return sock;
272 }
273 
274 void rxe_release_udp_tunnel(struct socket *sk)
275 {
276 	if (sk)
277 		udp_tunnel_sock_release(sk);
278 }
279 
280 static void prepare_udp_hdr(struct sk_buff *skb, __be16 src_port,
281 			    __be16 dst_port)
282 {
283 	struct udphdr *udph;
284 
285 	__skb_push(skb, sizeof(*udph));
286 	skb_reset_transport_header(skb);
287 	udph = udp_hdr(skb);
288 
289 	udph->dest = dst_port;
290 	udph->source = src_port;
291 	udph->len = htons(skb->len);
292 	udph->check = 0;
293 }
294 
295 static void prepare_ipv4_hdr(struct dst_entry *dst, struct sk_buff *skb,
296 			     __be32 saddr, __be32 daddr, __u8 proto,
297 			     __u8 tos, __u8 ttl, __be16 df, bool xnet)
298 {
299 	struct iphdr *iph;
300 
301 	skb_scrub_packet(skb, xnet);
302 
303 	skb_clear_hash(skb);
304 	skb_dst_set(skb, dst);
305 	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
306 
307 	skb_push(skb, sizeof(struct iphdr));
308 	skb_reset_network_header(skb);
309 
310 	iph = ip_hdr(skb);
311 
312 	iph->version	=	IPVERSION;
313 	iph->ihl	=	sizeof(struct iphdr) >> 2;
314 	iph->frag_off	=	df;
315 	iph->protocol	=	proto;
316 	iph->tos	=	tos;
317 	iph->daddr	=	daddr;
318 	iph->saddr	=	saddr;
319 	iph->ttl	=	ttl;
320 	__ip_select_ident(dev_net(dst->dev), iph,
321 			  skb_shinfo(skb)->gso_segs ?: 1);
322 	iph->tot_len = htons(skb->len);
323 	ip_send_check(iph);
324 }
325 
326 static void prepare_ipv6_hdr(struct dst_entry *dst, struct sk_buff *skb,
327 			     struct in6_addr *saddr, struct in6_addr *daddr,
328 			     __u8 proto, __u8 prio, __u8 ttl)
329 {
330 	struct ipv6hdr *ip6h;
331 
332 	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
333 	IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED
334 			    | IPSKB_REROUTED);
335 	skb_dst_set(skb, dst);
336 
337 	__skb_push(skb, sizeof(*ip6h));
338 	skb_reset_network_header(skb);
339 	ip6h		  = ipv6_hdr(skb);
340 	ip6_flow_hdr(ip6h, prio, htonl(0));
341 	ip6h->payload_len = htons(skb->len);
342 	ip6h->nexthdr     = proto;
343 	ip6h->hop_limit   = ttl;
344 	ip6h->daddr	  = *daddr;
345 	ip6h->saddr	  = *saddr;
346 	ip6h->payload_len = htons(skb->len - sizeof(*ip6h));
347 }
348 
349 static int prepare4(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
350 		    struct sk_buff *skb, struct rxe_av *av)
351 {
352 	struct dst_entry *dst;
353 	bool xnet = false;
354 	__be16 df = htons(IP_DF);
355 	struct in_addr *saddr = &av->sgid_addr._sockaddr_in.sin_addr;
356 	struct in_addr *daddr = &av->dgid_addr._sockaddr_in.sin_addr;
357 
358 	dst = rxe_find_route4(rxe->ndev, saddr, daddr);
359 	if (!dst) {
360 		pr_err("Host not reachable\n");
361 		return -EHOSTUNREACH;
362 	}
363 
364 	if (!memcmp(saddr, daddr, sizeof(*daddr)))
365 		pkt->mask |= RXE_LOOPBACK_MASK;
366 
367 	prepare_udp_hdr(skb, htons(RXE_ROCE_V2_SPORT),
368 			htons(ROCE_V2_UDP_DPORT));
369 
370 	prepare_ipv4_hdr(dst, skb, saddr->s_addr, daddr->s_addr, IPPROTO_UDP,
371 			 av->grh.traffic_class, av->grh.hop_limit, df, xnet);
372 	return 0;
373 }
374 
375 static int prepare6(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
376 		    struct sk_buff *skb, struct rxe_av *av)
377 {
378 	struct dst_entry *dst;
379 	struct in6_addr *saddr = &av->sgid_addr._sockaddr_in6.sin6_addr;
380 	struct in6_addr *daddr = &av->dgid_addr._sockaddr_in6.sin6_addr;
381 
382 	dst = rxe_find_route6(rxe->ndev, saddr, daddr);
383 	if (!dst) {
384 		pr_err("Host not reachable\n");
385 		return -EHOSTUNREACH;
386 	}
387 
388 	if (!memcmp(saddr, daddr, sizeof(*daddr)))
389 		pkt->mask |= RXE_LOOPBACK_MASK;
390 
391 	prepare_udp_hdr(skb, htons(RXE_ROCE_V2_SPORT),
392 			htons(ROCE_V2_UDP_DPORT));
393 
394 	prepare_ipv6_hdr(dst, skb, saddr, daddr, IPPROTO_UDP,
395 			 av->grh.traffic_class,
396 			 av->grh.hop_limit);
397 	return 0;
398 }
399 
400 int rxe_prepare(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
401 		struct sk_buff *skb, u32 *crc)
402 {
403 	int err = 0;
404 	struct rxe_av *av = rxe_get_av(pkt);
405 
406 	if (av->network_type == RDMA_NETWORK_IPV4)
407 		err = prepare4(rxe, pkt, skb, av);
408 	else if (av->network_type == RDMA_NETWORK_IPV6)
409 		err = prepare6(rxe, pkt, skb, av);
410 
411 	*crc = rxe_icrc_hdr(pkt, skb);
412 
413 	return err;
414 }
415 
416 static void rxe_skb_tx_dtor(struct sk_buff *skb)
417 {
418 	struct sock *sk = skb->sk;
419 	struct rxe_qp *qp = sk->sk_user_data;
420 	int skb_out = atomic_dec_return(&qp->skb_out);
421 
422 	if (unlikely(qp->need_req_skb &&
423 		     skb_out < RXE_INFLIGHT_SKBS_PER_QP_LOW))
424 		rxe_run_task(&qp->req.task, 1);
425 }
426 
427 int rxe_send(struct rxe_dev *rxe, struct rxe_pkt_info *pkt, struct sk_buff *skb)
428 {
429 	struct sk_buff *nskb;
430 	struct rxe_av *av;
431 	int err;
432 
433 	av = rxe_get_av(pkt);
434 
435 	nskb = skb_clone(skb, GFP_ATOMIC);
436 	if (!nskb)
437 		return -ENOMEM;
438 
439 	nskb->destructor = rxe_skb_tx_dtor;
440 	nskb->sk = pkt->qp->sk->sk;
441 
442 	if (av->network_type == RDMA_NETWORK_IPV4) {
443 		err = ip_local_out(dev_net(skb_dst(skb)->dev), nskb->sk, nskb);
444 	} else if (av->network_type == RDMA_NETWORK_IPV6) {
445 		err = ip6_local_out(dev_net(skb_dst(skb)->dev), nskb->sk, nskb);
446 	} else {
447 		pr_err("Unknown layer 3 protocol: %d\n", av->network_type);
448 		kfree_skb(nskb);
449 		return -EINVAL;
450 	}
451 
452 	if (unlikely(net_xmit_eval(err))) {
453 		pr_debug("error sending packet: %d\n", err);
454 		return -EAGAIN;
455 	}
456 
457 	atomic_inc(&pkt->qp->skb_out);
458 	kfree_skb(skb);
459 
460 	return 0;
461 }
462 
463 int rxe_loopback(struct sk_buff *skb)
464 {
465 	return rxe_rcv(skb);
466 }
467 
468 static inline int addr_same(struct rxe_dev *rxe, struct rxe_av *av)
469 {
470 	return rxe->port.port_guid == av->grh.dgid.global.interface_id;
471 }
472 
473 struct sk_buff *rxe_init_packet(struct rxe_dev *rxe, struct rxe_av *av,
474 				int paylen, struct rxe_pkt_info *pkt)
475 {
476 	unsigned int hdr_len;
477 	struct sk_buff *skb;
478 
479 	if (av->network_type == RDMA_NETWORK_IPV4)
480 		hdr_len = ETH_HLEN + sizeof(struct udphdr) +
481 			sizeof(struct iphdr);
482 	else
483 		hdr_len = ETH_HLEN + sizeof(struct udphdr) +
484 			sizeof(struct ipv6hdr);
485 
486 	skb = alloc_skb(paylen + hdr_len + LL_RESERVED_SPACE(rxe->ndev),
487 			GFP_ATOMIC);
488 	if (unlikely(!skb))
489 		return NULL;
490 
491 	skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(rxe->ndev));
492 
493 	skb->dev	= rxe->ndev;
494 	if (av->network_type == RDMA_NETWORK_IPV4)
495 		skb->protocol = htons(ETH_P_IP);
496 	else
497 		skb->protocol = htons(ETH_P_IPV6);
498 
499 	pkt->rxe	= rxe;
500 	pkt->port_num	= 1;
501 	pkt->hdr	= skb_put(skb, paylen);
502 	pkt->mask	|= RXE_GRH_MASK;
503 
504 	memset(pkt->hdr, 0, paylen);
505 
506 	return skb;
507 }
508 
509 /*
510  * this is required by rxe_cfg to match rxe devices in
511  * /sys/class/infiniband up with their underlying ethernet devices
512  */
513 const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num)
514 {
515 	return rxe->ndev->name;
516 }
517 
518 enum rdma_link_layer rxe_link_layer(struct rxe_dev *rxe, unsigned int port_num)
519 {
520 	return IB_LINK_LAYER_ETHERNET;
521 }
522 
523 struct rxe_dev *rxe_net_add(struct net_device *ndev)
524 {
525 	int err;
526 	struct rxe_dev *rxe = NULL;
527 
528 	rxe = (struct rxe_dev *)ib_alloc_device(sizeof(*rxe));
529 	if (!rxe)
530 		return NULL;
531 
532 	rxe->ndev = ndev;
533 
534 	err = rxe_add(rxe, ndev->mtu);
535 	if (err) {
536 		ib_dealloc_device(&rxe->ib_dev);
537 		return NULL;
538 	}
539 
540 	spin_lock_bh(&dev_list_lock);
541 	list_add_tail(&rxe->list, &rxe_dev_list);
542 	spin_unlock_bh(&dev_list_lock);
543 	return rxe;
544 }
545 
546 void rxe_remove_all(void)
547 {
548 	spin_lock_bh(&dev_list_lock);
549 	while (!list_empty(&rxe_dev_list)) {
550 		struct rxe_dev *rxe =
551 			list_first_entry(&rxe_dev_list, struct rxe_dev, list);
552 
553 		list_del(&rxe->list);
554 		spin_unlock_bh(&dev_list_lock);
555 		rxe_remove(rxe);
556 		spin_lock_bh(&dev_list_lock);
557 	}
558 	spin_unlock_bh(&dev_list_lock);
559 }
560 EXPORT_SYMBOL(rxe_remove_all);
561 
562 static void rxe_port_event(struct rxe_dev *rxe,
563 			   enum ib_event_type event)
564 {
565 	struct ib_event ev;
566 
567 	ev.device = &rxe->ib_dev;
568 	ev.element.port_num = 1;
569 	ev.event = event;
570 
571 	ib_dispatch_event(&ev);
572 }
573 
574 /* Caller must hold net_info_lock */
575 void rxe_port_up(struct rxe_dev *rxe)
576 {
577 	struct rxe_port *port;
578 
579 	port = &rxe->port;
580 	port->attr.state = IB_PORT_ACTIVE;
581 	port->attr.phys_state = IB_PHYS_STATE_LINK_UP;
582 
583 	rxe_port_event(rxe, IB_EVENT_PORT_ACTIVE);
584 	pr_info("set %s active\n", rxe->ib_dev.name);
585 }
586 
587 /* Caller must hold net_info_lock */
588 void rxe_port_down(struct rxe_dev *rxe)
589 {
590 	struct rxe_port *port;
591 
592 	port = &rxe->port;
593 	port->attr.state = IB_PORT_DOWN;
594 	port->attr.phys_state = IB_PHYS_STATE_LINK_DOWN;
595 
596 	rxe_port_event(rxe, IB_EVENT_PORT_ERR);
597 	pr_info("set %s down\n", rxe->ib_dev.name);
598 }
599 
600 static int rxe_notify(struct notifier_block *not_blk,
601 		      unsigned long event,
602 		      void *arg)
603 {
604 	struct net_device *ndev = netdev_notifier_info_to_dev(arg);
605 	struct rxe_dev *rxe = net_to_rxe(ndev);
606 
607 	if (!rxe)
608 		goto out;
609 
610 	switch (event) {
611 	case NETDEV_UNREGISTER:
612 		list_del(&rxe->list);
613 		rxe_remove(rxe);
614 		break;
615 	case NETDEV_UP:
616 		rxe_port_up(rxe);
617 		break;
618 	case NETDEV_DOWN:
619 		rxe_port_down(rxe);
620 		break;
621 	case NETDEV_CHANGEMTU:
622 		pr_info("%s changed mtu to %d\n", ndev->name, ndev->mtu);
623 		rxe_set_mtu(rxe, ndev->mtu);
624 		break;
625 	case NETDEV_REBOOT:
626 	case NETDEV_CHANGE:
627 	case NETDEV_GOING_DOWN:
628 	case NETDEV_CHANGEADDR:
629 	case NETDEV_CHANGENAME:
630 	case NETDEV_FEAT_CHANGE:
631 	default:
632 		pr_info("ignoring netdev event = %ld for %s\n",
633 			event, ndev->name);
634 		break;
635 	}
636 out:
637 	return NOTIFY_OK;
638 }
639 
640 struct notifier_block rxe_net_notifier = {
641 	.notifier_call = rxe_notify,
642 };
643 
644 static int rxe_net_ipv4_init(void)
645 {
646 	recv_sockets.sk4 = rxe_setup_udp_tunnel(&init_net,
647 				htons(ROCE_V2_UDP_DPORT), false);
648 	if (IS_ERR(recv_sockets.sk4)) {
649 		recv_sockets.sk4 = NULL;
650 		pr_err("Failed to create IPv4 UDP tunnel\n");
651 		return -1;
652 	}
653 
654 	return 0;
655 }
656 
657 static int rxe_net_ipv6_init(void)
658 {
659 #if IS_ENABLED(CONFIG_IPV6)
660 
661 	recv_sockets.sk6 = rxe_setup_udp_tunnel(&init_net,
662 						htons(ROCE_V2_UDP_DPORT), true);
663 	if (IS_ERR(recv_sockets.sk6)) {
664 		recv_sockets.sk6 = NULL;
665 		pr_err("Failed to create IPv6 UDP tunnel\n");
666 		return -1;
667 	}
668 #endif
669 	return 0;
670 }
671 
672 void rxe_net_exit(void)
673 {
674 	rxe_release_udp_tunnel(recv_sockets.sk6);
675 	rxe_release_udp_tunnel(recv_sockets.sk4);
676 	unregister_netdevice_notifier(&rxe_net_notifier);
677 }
678 
679 int rxe_net_init(void)
680 {
681 	int err;
682 
683 	recv_sockets.sk6 = NULL;
684 
685 	err = rxe_net_ipv4_init();
686 	if (err)
687 		return err;
688 	err = rxe_net_ipv6_init();
689 	if (err)
690 		goto err_out;
691 	err = register_netdevice_notifier(&rxe_net_notifier);
692 	if (err) {
693 		pr_err("Failed to register netdev notifier\n");
694 		goto err_out;
695 	}
696 	return 0;
697 err_out:
698 	rxe_net_exit();
699 	return err;
700 }
701