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
23static struct dst_entry *rxe_find_route4(struct rxe_qp *qp,
24 struct net_device *ndev,
25 struct in_addr *saddr,
26 struct in_addr *daddr)
27{
28 struct rtable *rt;
29 struct flowi4 fl = { { 0 } };
30
31 memset(&fl, 0, sizeof(fl));
32 fl.flowi4_oif = ndev->ifindex;
33 memcpy(&fl.saddr, saddr, sizeof(*saddr));
34 memcpy(&fl.daddr, daddr, sizeof(*daddr));
35 fl.flowi4_proto = IPPROTO_UDP;
36
37 rt = ip_route_output_key(net: &init_net, flp: &fl);
38 if (IS_ERR(ptr: rt)) {
39 rxe_dbg_qp(qp, "no route to %pI4\n", &daddr->s_addr);
40 return NULL;
41 }
42
43 return &rt->dst;
44}
45
46#if IS_ENABLED(CONFIG_IPV6)
47static struct dst_entry *rxe_find_route6(struct rxe_qp *qp,
48 struct net_device *ndev,
49 struct in6_addr *saddr,
50 struct in6_addr *daddr)
51{
52 struct dst_entry *ndst;
53 struct flowi6 fl6 = { { 0 } };
54
55 memset(&fl6, 0, sizeof(fl6));
56 fl6.flowi6_oif = ndev->ifindex;
57 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
58 memcpy(&fl6.daddr, daddr, sizeof(*daddr));
59 fl6.flowi6_proto = IPPROTO_UDP;
60
61 ndst = ipv6_stub->ipv6_dst_lookup_flow(sock_net(sk: recv_sockets.sk6->sk),
62 recv_sockets.sk6->sk, &fl6,
63 NULL);
64 if (IS_ERR(ptr: ndst)) {
65 rxe_dbg_qp(qp, "no route to %pI6\n", daddr);
66 return NULL;
67 }
68
69 if (unlikely(ndst->error)) {
70 rxe_dbg_qp(qp, "no route to %pI6\n", daddr);
71 goto put;
72 }
73
74 return ndst;
75put:
76 dst_release(dst: ndst);
77 return NULL;
78}
79
80#else
81
82static struct dst_entry *rxe_find_route6(struct rxe_qp *qp,
83 struct net_device *ndev,
84 struct in6_addr *saddr,
85 struct in6_addr *daddr)
86{
87 return NULL;
88}
89
90#endif
91
92static struct dst_entry *rxe_find_route(struct net_device *ndev,
93 struct rxe_qp *qp,
94 struct rxe_av *av)
95{
96 struct dst_entry *dst = NULL;
97
98 if (qp_type(qp) == IB_QPT_RC)
99 dst = sk_dst_get(sk: qp->sk->sk);
100
101 if (!dst || !dst_check(dst, cookie: qp->dst_cookie)) {
102 if (dst)
103 dst_release(dst);
104
105 if (av->network_type == RXE_NETWORK_TYPE_IPV4) {
106 struct in_addr *saddr;
107 struct in_addr *daddr;
108
109 saddr = &av->sgid_addr._sockaddr_in.sin_addr;
110 daddr = &av->dgid_addr._sockaddr_in.sin_addr;
111 dst = rxe_find_route4(qp, ndev, saddr, daddr);
112 } else if (av->network_type == RXE_NETWORK_TYPE_IPV6) {
113 struct in6_addr *saddr6;
114 struct in6_addr *daddr6;
115
116 saddr6 = &av->sgid_addr._sockaddr_in6.sin6_addr;
117 daddr6 = &av->dgid_addr._sockaddr_in6.sin6_addr;
118 dst = rxe_find_route6(qp, ndev, saddr: saddr6, daddr: daddr6);
119#if IS_ENABLED(CONFIG_IPV6)
120 if (dst)
121 qp->dst_cookie =
122 rt6_get_cookie(rt: (struct rt6_info *)dst);
123#endif
124 }
125
126 if (dst && (qp_type(qp) == IB_QPT_RC)) {
127 dst_hold(dst);
128 sk_dst_set(sk: qp->sk->sk, dst);
129 }
130 }
131 return dst;
132}
133
134static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
135{
136 struct udphdr *udph;
137 struct rxe_dev *rxe;
138 struct net_device *ndev = skb->dev;
139 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
140
141 /* takes a reference on rxe->ib_dev
142 * drop when skb is freed
143 */
144 rxe = rxe_get_dev_from_net(ndev);
145 if (!rxe && is_vlan_dev(dev: ndev))
146 rxe = rxe_get_dev_from_net(ndev: vlan_dev_real_dev(dev: ndev));
147 if (!rxe)
148 goto drop;
149
150 if (skb_linearize(skb)) {
151 ib_device_put(device: &rxe->ib_dev);
152 goto drop;
153 }
154
155 udph = udp_hdr(skb);
156 pkt->rxe = rxe;
157 pkt->port_num = 1;
158 pkt->hdr = (u8 *)(udph + 1);
159 pkt->mask = RXE_GRH_MASK;
160 pkt->paylen = be16_to_cpu(udph->len) - sizeof(*udph);
161
162 /* remove udp header */
163 skb_pull(skb, len: sizeof(struct udphdr));
164
165 rxe_rcv(skb);
166
167 return 0;
168drop:
169 kfree_skb(skb);
170
171 return 0;
172}
173
174static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port,
175 bool ipv6)
176{
177 int err;
178 struct socket *sock;
179 struct udp_port_cfg udp_cfg = { };
180 struct udp_tunnel_sock_cfg tnl_cfg = { };
181
182 if (ipv6) {
183 udp_cfg.family = AF_INET6;
184 udp_cfg.ipv6_v6only = 1;
185 } else {
186 udp_cfg.family = AF_INET;
187 }
188
189 udp_cfg.local_udp_port = port;
190
191 /* Create UDP socket */
192 err = udp_sock_create(net, cfg: &udp_cfg, sockp: &sock);
193 if (err < 0)
194 return ERR_PTR(error: err);
195
196 tnl_cfg.encap_type = 1;
197 tnl_cfg.encap_rcv = rxe_udp_encap_recv;
198
199 /* Setup UDP tunnel */
200 setup_udp_tunnel_sock(net, sock, sock_cfg: &tnl_cfg);
201
202 return sock;
203}
204
205static void rxe_release_udp_tunnel(struct socket *sk)
206{
207 if (sk)
208 udp_tunnel_sock_release(sock: sk);
209}
210
211static void prepare_udp_hdr(struct sk_buff *skb, __be16 src_port,
212 __be16 dst_port)
213{
214 struct udphdr *udph;
215
216 __skb_push(skb, len: sizeof(*udph));
217 skb_reset_transport_header(skb);
218 udph = udp_hdr(skb);
219
220 udph->dest = dst_port;
221 udph->source = src_port;
222 udph->len = htons(skb->len);
223 udph->check = 0;
224}
225
226static void prepare_ipv4_hdr(struct dst_entry *dst, struct sk_buff *skb,
227 __be32 saddr, __be32 daddr, __u8 proto,
228 __u8 tos, __u8 ttl, __be16 df, bool xnet)
229{
230 struct iphdr *iph;
231
232 skb_scrub_packet(skb, xnet);
233
234 skb_clear_hash(skb);
235 skb_dst_set(skb, dst: dst_clone(dst));
236 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
237
238 skb_push(skb, len: sizeof(struct iphdr));
239 skb_reset_network_header(skb);
240
241 iph = ip_hdr(skb);
242
243 iph->version = IPVERSION;
244 iph->ihl = sizeof(struct iphdr) >> 2;
245 iph->tot_len = htons(skb->len);
246 iph->frag_off = df;
247 iph->protocol = proto;
248 iph->tos = tos;
249 iph->daddr = daddr;
250 iph->saddr = saddr;
251 iph->ttl = ttl;
252 __ip_select_ident(net: dev_net(dev: dst->dev), iph,
253 skb_shinfo(skb)->gso_segs ?: 1);
254}
255
256static void prepare_ipv6_hdr(struct dst_entry *dst, struct sk_buff *skb,
257 struct in6_addr *saddr, struct in6_addr *daddr,
258 __u8 proto, __u8 prio, __u8 ttl)
259{
260 struct ipv6hdr *ip6h;
261
262 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
263 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED
264 | IPSKB_REROUTED);
265 skb_dst_set(skb, dst: dst_clone(dst));
266
267 __skb_push(skb, len: sizeof(*ip6h));
268 skb_reset_network_header(skb);
269 ip6h = ipv6_hdr(skb);
270 ip6_flow_hdr(hdr: ip6h, tclass: prio, htonl(0));
271 ip6h->payload_len = htons(skb->len);
272 ip6h->nexthdr = proto;
273 ip6h->hop_limit = ttl;
274 ip6h->daddr = *daddr;
275 ip6h->saddr = *saddr;
276 ip6h->payload_len = htons(skb->len - sizeof(*ip6h));
277}
278
279static int prepare4(struct rxe_av *av, struct rxe_pkt_info *pkt,
280 struct sk_buff *skb)
281{
282 struct rxe_qp *qp = pkt->qp;
283 struct dst_entry *dst;
284 bool xnet = false;
285 __be16 df = htons(IP_DF);
286 struct in_addr *saddr = &av->sgid_addr._sockaddr_in.sin_addr;
287 struct in_addr *daddr = &av->dgid_addr._sockaddr_in.sin_addr;
288
289 dst = rxe_find_route(ndev: skb->dev, qp, av);
290 if (!dst) {
291 rxe_dbg_qp(qp, "Host not reachable\n");
292 return -EHOSTUNREACH;
293 }
294
295 prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
296 cpu_to_be16(ROCE_V2_UDP_DPORT));
297
298 prepare_ipv4_hdr(dst, skb, saddr: saddr->s_addr, daddr: daddr->s_addr, IPPROTO_UDP,
299 tos: av->grh.traffic_class, ttl: av->grh.hop_limit, df, xnet);
300
301 dst_release(dst);
302 return 0;
303}
304
305static int prepare6(struct rxe_av *av, struct rxe_pkt_info *pkt,
306 struct sk_buff *skb)
307{
308 struct rxe_qp *qp = pkt->qp;
309 struct dst_entry *dst;
310 struct in6_addr *saddr = &av->sgid_addr._sockaddr_in6.sin6_addr;
311 struct in6_addr *daddr = &av->dgid_addr._sockaddr_in6.sin6_addr;
312
313 dst = rxe_find_route(ndev: skb->dev, qp, av);
314 if (!dst) {
315 rxe_dbg_qp(qp, "Host not reachable\n");
316 return -EHOSTUNREACH;
317 }
318
319 prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
320 cpu_to_be16(ROCE_V2_UDP_DPORT));
321
322 prepare_ipv6_hdr(dst, skb, saddr, daddr, IPPROTO_UDP,
323 prio: av->grh.traffic_class,
324 ttl: av->grh.hop_limit);
325
326 dst_release(dst);
327 return 0;
328}
329
330int rxe_prepare(struct rxe_av *av, struct rxe_pkt_info *pkt,
331 struct sk_buff *skb)
332{
333 int err = 0;
334
335 if (skb->protocol == htons(ETH_P_IP))
336 err = prepare4(av, pkt, skb);
337 else if (skb->protocol == htons(ETH_P_IPV6))
338 err = prepare6(av, pkt, skb);
339
340 if (ether_addr_equal(addr1: skb->dev->dev_addr, addr2: av->dmac))
341 pkt->mask |= RXE_LOOPBACK_MASK;
342
343 return err;
344}
345
346static void rxe_skb_tx_dtor(struct sk_buff *skb)
347{
348 struct sock *sk = skb->sk;
349 struct rxe_qp *qp = sk->sk_user_data;
350 int skb_out = atomic_dec_return(v: &qp->skb_out);
351
352 if (unlikely(qp->need_req_skb &&
353 skb_out < RXE_INFLIGHT_SKBS_PER_QP_LOW))
354 rxe_sched_task(task: &qp->req.task);
355
356 rxe_put(qp);
357}
358
359static int rxe_send(struct sk_buff *skb, struct rxe_pkt_info *pkt)
360{
361 int err;
362
363 skb->destructor = rxe_skb_tx_dtor;
364 skb->sk = pkt->qp->sk->sk;
365
366 rxe_get(pkt->qp);
367 atomic_inc(v: &pkt->qp->skb_out);
368
369 if (skb->protocol == htons(ETH_P_IP)) {
370 err = ip_local_out(net: dev_net(dev: skb_dst(skb)->dev), sk: skb->sk, skb);
371 } else if (skb->protocol == htons(ETH_P_IPV6)) {
372 err = ip6_local_out(net: dev_net(dev: skb_dst(skb)->dev), sk: skb->sk, skb);
373 } else {
374 rxe_dbg_qp(pkt->qp, "Unknown layer 3 protocol: %d\n",
375 skb->protocol);
376 atomic_dec(v: &pkt->qp->skb_out);
377 rxe_put(pkt->qp);
378 kfree_skb(skb);
379 return -EINVAL;
380 }
381
382 if (unlikely(net_xmit_eval(err))) {
383 rxe_dbg_qp(pkt->qp, "error sending packet: %d\n", err);
384 return -EAGAIN;
385 }
386
387 return 0;
388}
389
390/* fix up a send packet to match the packets
391 * received from UDP before looping them back
392 */
393static int rxe_loopback(struct sk_buff *skb, struct rxe_pkt_info *pkt)
394{
395 memcpy(SKB_TO_PKT(skb), pkt, sizeof(*pkt));
396
397 if (skb->protocol == htons(ETH_P_IP))
398 skb_pull(skb, len: sizeof(struct iphdr));
399 else
400 skb_pull(skb, len: sizeof(struct ipv6hdr));
401
402 if (WARN_ON(!ib_device_try_get(&pkt->rxe->ib_dev))) {
403 kfree_skb(skb);
404 return -EIO;
405 }
406
407 /* remove udp header */
408 skb_pull(skb, len: sizeof(struct udphdr));
409
410 rxe_rcv(skb);
411
412 return 0;
413}
414
415int rxe_xmit_packet(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
416 struct sk_buff *skb)
417{
418 int err;
419 int is_request = pkt->mask & RXE_REQ_MASK;
420 struct rxe_dev *rxe = to_rdev(dev: qp->ibqp.device);
421 unsigned long flags;
422
423 spin_lock_irqsave(&qp->state_lock, flags);
424 if ((is_request && (qp_state(qp) < IB_QPS_RTS)) ||
425 (!is_request && (qp_state(qp) < IB_QPS_RTR))) {
426 spin_unlock_irqrestore(lock: &qp->state_lock, flags);
427 rxe_dbg_qp(qp, "Packet dropped. QP is not in ready state\n");
428 goto drop;
429 }
430 spin_unlock_irqrestore(lock: &qp->state_lock, flags);
431
432 rxe_icrc_generate(skb, pkt);
433
434 if (pkt->mask & RXE_LOOPBACK_MASK)
435 err = rxe_loopback(skb, pkt);
436 else
437 err = rxe_send(skb, pkt);
438 if (err) {
439 rxe_counter_inc(rxe, index: RXE_CNT_SEND_ERR);
440 return err;
441 }
442
443 if ((qp_type(qp) != IB_QPT_RC) &&
444 (pkt->mask & RXE_END_MASK)) {
445 pkt->wqe->state = wqe_state_done;
446 rxe_sched_task(task: &qp->comp.task);
447 }
448
449 rxe_counter_inc(rxe, index: RXE_CNT_SENT_PKTS);
450 goto done;
451
452drop:
453 kfree_skb(skb);
454 err = 0;
455done:
456 return err;
457}
458
459struct sk_buff *rxe_init_packet(struct rxe_dev *rxe, struct rxe_av *av,
460 int paylen, struct rxe_pkt_info *pkt)
461{
462 unsigned int hdr_len;
463 struct sk_buff *skb = NULL;
464 struct net_device *ndev;
465 const struct ib_gid_attr *attr;
466 const int port_num = 1;
467
468 attr = rdma_get_gid_attr(device: &rxe->ib_dev, port_num, index: av->grh.sgid_index);
469 if (IS_ERR(ptr: attr))
470 return NULL;
471
472 if (av->network_type == RXE_NETWORK_TYPE_IPV4)
473 hdr_len = ETH_HLEN + sizeof(struct udphdr) +
474 sizeof(struct iphdr);
475 else
476 hdr_len = ETH_HLEN + sizeof(struct udphdr) +
477 sizeof(struct ipv6hdr);
478
479 rcu_read_lock();
480 ndev = rdma_read_gid_attr_ndev_rcu(attr);
481 if (IS_ERR(ptr: ndev)) {
482 rcu_read_unlock();
483 goto out;
484 }
485 skb = alloc_skb(size: paylen + hdr_len + LL_RESERVED_SPACE(ndev),
486 GFP_ATOMIC);
487
488 if (unlikely(!skb)) {
489 rcu_read_unlock();
490 goto out;
491 }
492
493 skb_reserve(skb, len: hdr_len + LL_RESERVED_SPACE(ndev));
494
495 /* FIXME: hold reference to this netdev until life of this skb. */
496 skb->dev = ndev;
497 rcu_read_unlock();
498
499 if (av->network_type == RXE_NETWORK_TYPE_IPV4)
500 skb->protocol = htons(ETH_P_IP);
501 else
502 skb->protocol = htons(ETH_P_IPV6);
503
504 pkt->rxe = rxe;
505 pkt->port_num = port_num;
506 pkt->hdr = skb_put(skb, len: paylen);
507 pkt->mask |= RXE_GRH_MASK;
508
509out:
510 rdma_put_gid_attr(attr);
511 return skb;
512}
513
514/*
515 * this is required by rxe_cfg to match rxe devices in
516 * /sys/class/infiniband up with their underlying ethernet devices
517 */
518const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num)
519{
520 return rxe->ndev->name;
521}
522
523int rxe_net_add(const char *ibdev_name, struct net_device *ndev)
524{
525 int err;
526 struct rxe_dev *rxe = NULL;
527
528 rxe = ib_alloc_device(rxe_dev, ib_dev);
529 if (!rxe)
530 return -ENOMEM;
531
532 rxe->ndev = ndev;
533
534 err = rxe_add(rxe, mtu: ndev->mtu, ibdev_name);
535 if (err) {
536 ib_dealloc_device(device: &rxe->ib_dev);
537 return err;
538 }
539
540 return 0;
541}
542
543static void rxe_port_event(struct rxe_dev *rxe,
544 enum ib_event_type event)
545{
546 struct ib_event ev;
547
548 ev.device = &rxe->ib_dev;
549 ev.element.port_num = 1;
550 ev.event = event;
551
552 ib_dispatch_event(event: &ev);
553}
554
555/* Caller must hold net_info_lock */
556void rxe_port_up(struct rxe_dev *rxe)
557{
558 struct rxe_port *port;
559
560 port = &rxe->port;
561 port->attr.state = IB_PORT_ACTIVE;
562
563 rxe_port_event(rxe, event: IB_EVENT_PORT_ACTIVE);
564 dev_info(&rxe->ib_dev.dev, "set active\n");
565}
566
567/* Caller must hold net_info_lock */
568void rxe_port_down(struct rxe_dev *rxe)
569{
570 struct rxe_port *port;
571
572 port = &rxe->port;
573 port->attr.state = IB_PORT_DOWN;
574
575 rxe_port_event(rxe, event: IB_EVENT_PORT_ERR);
576 rxe_counter_inc(rxe, index: RXE_CNT_LINK_DOWNED);
577 dev_info(&rxe->ib_dev.dev, "set down\n");
578}
579
580void rxe_set_port_state(struct rxe_dev *rxe)
581{
582 if (netif_running(dev: rxe->ndev) && netif_carrier_ok(dev: rxe->ndev))
583 rxe_port_up(rxe);
584 else
585 rxe_port_down(rxe);
586}
587
588static int rxe_notify(struct notifier_block *not_blk,
589 unsigned long event,
590 void *arg)
591{
592 struct net_device *ndev = netdev_notifier_info_to_dev(info: arg);
593 struct rxe_dev *rxe = rxe_get_dev_from_net(ndev);
594
595 if (!rxe)
596 return NOTIFY_OK;
597
598 switch (event) {
599 case NETDEV_UNREGISTER:
600 ib_unregister_device_queued(ib_dev: &rxe->ib_dev);
601 break;
602 case NETDEV_UP:
603 rxe_port_up(rxe);
604 break;
605 case NETDEV_DOWN:
606 rxe_port_down(rxe);
607 break;
608 case NETDEV_CHANGEMTU:
609 rxe_dbg_dev(rxe, "%s changed mtu to %d\n", ndev->name, ndev->mtu);
610 rxe_set_mtu(rxe, dev_mtu: ndev->mtu);
611 break;
612 case NETDEV_CHANGE:
613 rxe_set_port_state(rxe);
614 break;
615 case NETDEV_REBOOT:
616 case NETDEV_GOING_DOWN:
617 case NETDEV_CHANGEADDR:
618 case NETDEV_CHANGENAME:
619 case NETDEV_FEAT_CHANGE:
620 default:
621 rxe_dbg_dev(rxe, "ignoring netdev event = %ld for %s\n",
622 event, ndev->name);
623 break;
624 }
625
626 ib_device_put(device: &rxe->ib_dev);
627 return NOTIFY_OK;
628}
629
630static struct notifier_block rxe_net_notifier = {
631 .notifier_call = rxe_notify,
632};
633
634static int rxe_net_ipv4_init(void)
635{
636 recv_sockets.sk4 = rxe_setup_udp_tunnel(net: &init_net,
637 htons(ROCE_V2_UDP_DPORT), ipv6: false);
638 if (IS_ERR(ptr: recv_sockets.sk4)) {
639 recv_sockets.sk4 = NULL;
640 pr_err("Failed to create IPv4 UDP tunnel\n");
641 return -1;
642 }
643
644 return 0;
645}
646
647static int rxe_net_ipv6_init(void)
648{
649#if IS_ENABLED(CONFIG_IPV6)
650
651 recv_sockets.sk6 = rxe_setup_udp_tunnel(net: &init_net,
652 htons(ROCE_V2_UDP_DPORT), ipv6: true);
653 if (PTR_ERR(ptr: recv_sockets.sk6) == -EAFNOSUPPORT) {
654 recv_sockets.sk6 = NULL;
655 pr_warn("IPv6 is not supported, can not create a UDPv6 socket\n");
656 return 0;
657 }
658
659 if (IS_ERR(ptr: recv_sockets.sk6)) {
660 recv_sockets.sk6 = NULL;
661 pr_err("Failed to create IPv6 UDP tunnel\n");
662 return -1;
663 }
664#endif
665 return 0;
666}
667
668void rxe_net_exit(void)
669{
670 rxe_release_udp_tunnel(sk: recv_sockets.sk6);
671 rxe_release_udp_tunnel(sk: recv_sockets.sk4);
672 unregister_netdevice_notifier(nb: &rxe_net_notifier);
673}
674
675int rxe_net_init(void)
676{
677 int err;
678
679 recv_sockets.sk6 = NULL;
680
681 err = rxe_net_ipv4_init();
682 if (err)
683 return err;
684 err = rxe_net_ipv6_init();
685 if (err)
686 goto err_out;
687 err = register_netdevice_notifier(nb: &rxe_net_notifier);
688 if (err) {
689 pr_err("Failed to register netdev notifier\n");
690 goto err_out;
691 }
692 return 0;
693err_out:
694 rxe_net_exit();
695 return err;
696}
697

source code of linux/drivers/infiniband/sw/rxe/rxe_net.c