1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
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
48static struct rxe_recv_sockets recv_sockets;
49
50struct device *rxe_dma_device(struct rxe_dev *rxe)
51{
52 struct net_device *ndev;
53
54 ndev = rxe->ndev;
55
56 if (is_vlan_dev(ndev))
57 ndev = vlan_dev_real_dev(ndev);
58
59 return ndev->dev.parent;
60}
61
62int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid)
63{
64 int err;
65 unsigned char ll_addr[ETH_ALEN];
66
67 ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr);
68 err = dev_mc_add(rxe->ndev, ll_addr);
69
70 return err;
71}
72
73int rxe_mcast_delete(struct rxe_dev *rxe, union ib_gid *mgid)
74{
75 int err;
76 unsigned char ll_addr[ETH_ALEN];
77
78 ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr);
79 err = dev_mc_del(rxe->ndev, ll_addr);
80
81 return err;
82}
83
84static struct dst_entry *rxe_find_route4(struct net_device *ndev,
85 struct in_addr *saddr,
86 struct in_addr *daddr)
87{
88 struct rtable *rt;
89 struct flowi4 fl = { { 0 } };
90
91 memset(&fl, 0, sizeof(fl));
92 fl.flowi4_oif = ndev->ifindex;
93 memcpy(&fl.saddr, saddr, sizeof(*saddr));
94 memcpy(&fl.daddr, daddr, sizeof(*daddr));
95 fl.flowi4_proto = IPPROTO_UDP;
96
97 rt = ip_route_output_key(&init_net, &fl);
98 if (IS_ERR(rt)) {
99 pr_err_ratelimited("no route to %pI4\n", &daddr->s_addr);
100 return NULL;
101 }
102
103 return &rt->dst;
104}
105
106#if IS_ENABLED(CONFIG_IPV6)
107static struct dst_entry *rxe_find_route6(struct net_device *ndev,
108 struct in6_addr *saddr,
109 struct in6_addr *daddr)
110{
111 struct dst_entry *ndst;
112 struct flowi6 fl6 = { { 0 } };
113
114 memset(&fl6, 0, sizeof(fl6));
115 fl6.flowi6_oif = ndev->ifindex;
116 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
117 memcpy(&fl6.daddr, daddr, sizeof(*daddr));
118 fl6.flowi6_proto = IPPROTO_UDP;
119
120 ndst = ipv6_stub->ipv6_dst_lookup_flow(sock_net(recv_sockets.sk6->sk),
121 recv_sockets.sk6->sk, &fl6,
122 NULL);
123 if (unlikely(IS_ERR(ndst))) {
124 pr_err_ratelimited("no route to %pI6\n", daddr);
125 return NULL;
126 }
127
128 if (unlikely(ndst->error)) {
129 pr_err("no route to %pI6\n", daddr);
130 goto put;
131 }
132
133 return ndst;
134put:
135 dst_release(ndst);
136 return NULL;
137}
138
139#else
140
141static struct dst_entry *rxe_find_route6(struct net_device *ndev,
142 struct in6_addr *saddr,
143 struct in6_addr *daddr)
144{
145 return NULL;
146}
147
148#endif
149
150static struct dst_entry *rxe_find_route(struct net_device *ndev,
151 struct rxe_qp *qp,
152 struct rxe_av *av)
153{
154 struct dst_entry *dst = NULL;
155
156 if (qp_type(qp) == IB_QPT_RC)
157 dst = sk_dst_get(qp->sk->sk);
158
159 if (!dst || !dst_check(dst, qp->dst_cookie)) {
160 if (dst)
161 dst_release(dst);
162
163 if (av->network_type == RDMA_NETWORK_IPV4) {
164 struct in_addr *saddr;
165 struct in_addr *daddr;
166
167 saddr = &av->sgid_addr._sockaddr_in.sin_addr;
168 daddr = &av->dgid_addr._sockaddr_in.sin_addr;
169 dst = rxe_find_route4(ndev, saddr, daddr);
170 } else if (av->network_type == RDMA_NETWORK_IPV6) {
171 struct in6_addr *saddr6;
172 struct in6_addr *daddr6;
173
174 saddr6 = &av->sgid_addr._sockaddr_in6.sin6_addr;
175 daddr6 = &av->dgid_addr._sockaddr_in6.sin6_addr;
176 dst = rxe_find_route6(ndev, saddr6, daddr6);
177#if IS_ENABLED(CONFIG_IPV6)
178 if (dst)
179 qp->dst_cookie =
180 rt6_get_cookie((struct rt6_info *)dst);
181#endif
182 }
183
184 if (dst && (qp_type(qp) == IB_QPT_RC)) {
185 dst_hold(dst);
186 sk_dst_set(qp->sk->sk, dst);
187 }
188 }
189 return dst;
190}
191
192static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
193{
194 struct udphdr *udph;
195 struct net_device *ndev = skb->dev;
196 struct net_device *rdev = ndev;
197 struct rxe_dev *rxe = rxe_get_dev_from_net(ndev);
198 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
199
200 if (!rxe && is_vlan_dev(rdev)) {
201 rdev = vlan_dev_real_dev(ndev);
202 rxe = rxe_get_dev_from_net(rdev);
203 }
204 if (!rxe)
205 goto drop;
206
207 if (skb_linearize(skb)) {
208 pr_err("skb_linearize failed\n");
209 ib_device_put(&rxe->ib_dev);
210 goto drop;
211 }
212
213 udph = udp_hdr(skb);
214 pkt->rxe = rxe;
215 pkt->port_num = 1;
216 pkt->hdr = (u8 *)(udph + 1);
217 pkt->mask = RXE_GRH_MASK;
218 pkt->paylen = be16_to_cpu(udph->len) - sizeof(*udph);
219
220 rxe_rcv(skb);
221
222
223
224
225
226 ib_device_put(&rxe->ib_dev);
227
228 return 0;
229drop:
230 kfree_skb(skb);
231
232 return 0;
233}
234
235static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port,
236 bool ipv6)
237{
238 int err;
239 struct socket *sock;
240 struct udp_port_cfg udp_cfg = { };
241 struct udp_tunnel_sock_cfg tnl_cfg = { };
242
243 if (ipv6) {
244 udp_cfg.family = AF_INET6;
245 udp_cfg.ipv6_v6only = 1;
246 } else {
247 udp_cfg.family = AF_INET;
248 }
249
250 udp_cfg.local_udp_port = port;
251
252
253 err = udp_sock_create(net, &udp_cfg, &sock);
254 if (err < 0) {
255 pr_err("failed to create udp socket. err = %d\n", err);
256 return ERR_PTR(err);
257 }
258
259 tnl_cfg.encap_type = 1;
260 tnl_cfg.encap_rcv = rxe_udp_encap_recv;
261
262
263 setup_udp_tunnel_sock(net, sock, &tnl_cfg);
264
265 return sock;
266}
267
268static void rxe_release_udp_tunnel(struct socket *sk)
269{
270 if (sk)
271 udp_tunnel_sock_release(sk);
272}
273
274static void prepare_udp_hdr(struct sk_buff *skb, __be16 src_port,
275 __be16 dst_port)
276{
277 struct udphdr *udph;
278
279 __skb_push(skb, sizeof(*udph));
280 skb_reset_transport_header(skb);
281 udph = udp_hdr(skb);
282
283 udph->dest = dst_port;
284 udph->source = src_port;
285 udph->len = htons(skb->len);
286 udph->check = 0;
287}
288
289static void prepare_ipv4_hdr(struct dst_entry *dst, struct sk_buff *skb,
290 __be32 saddr, __be32 daddr, __u8 proto,
291 __u8 tos, __u8 ttl, __be16 df, bool xnet)
292{
293 struct iphdr *iph;
294
295 skb_scrub_packet(skb, xnet);
296
297 skb_clear_hash(skb);
298 skb_dst_set(skb, dst_clone(dst));
299 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
300
301 skb_push(skb, sizeof(struct iphdr));
302 skb_reset_network_header(skb);
303
304 iph = ip_hdr(skb);
305
306 iph->version = IPVERSION;
307 iph->ihl = sizeof(struct iphdr) >> 2;
308 iph->frag_off = df;
309 iph->protocol = proto;
310 iph->tos = tos;
311 iph->daddr = daddr;
312 iph->saddr = saddr;
313 iph->ttl = ttl;
314 __ip_select_ident(dev_net(dst->dev), iph,
315 skb_shinfo(skb)->gso_segs ?: 1);
316 iph->tot_len = htons(skb->len);
317 ip_send_check(iph);
318}
319
320static void prepare_ipv6_hdr(struct dst_entry *dst, struct sk_buff *skb,
321 struct in6_addr *saddr, struct in6_addr *daddr,
322 __u8 proto, __u8 prio, __u8 ttl)
323{
324 struct ipv6hdr *ip6h;
325
326 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
327 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED
328 | IPSKB_REROUTED);
329 skb_dst_set(skb, dst_clone(dst));
330
331 __skb_push(skb, sizeof(*ip6h));
332 skb_reset_network_header(skb);
333 ip6h = ipv6_hdr(skb);
334 ip6_flow_hdr(ip6h, prio, htonl(0));
335 ip6h->payload_len = htons(skb->len);
336 ip6h->nexthdr = proto;
337 ip6h->hop_limit = ttl;
338 ip6h->daddr = *daddr;
339 ip6h->saddr = *saddr;
340 ip6h->payload_len = htons(skb->len - sizeof(*ip6h));
341}
342
343static int prepare4(struct rxe_pkt_info *pkt, struct sk_buff *skb)
344{
345 struct rxe_qp *qp = pkt->qp;
346 struct dst_entry *dst;
347 bool xnet = false;
348 __be16 df = htons(IP_DF);
349 struct rxe_av *av = rxe_get_av(pkt);
350 struct in_addr *saddr = &av->sgid_addr._sockaddr_in.sin_addr;
351 struct in_addr *daddr = &av->dgid_addr._sockaddr_in.sin_addr;
352
353 dst = rxe_find_route(skb->dev, qp, av);
354 if (!dst) {
355 pr_err("Host not reachable\n");
356 return -EHOSTUNREACH;
357 }
358
359 prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
360 cpu_to_be16(ROCE_V2_UDP_DPORT));
361
362 prepare_ipv4_hdr(dst, skb, saddr->s_addr, daddr->s_addr, IPPROTO_UDP,
363 av->grh.traffic_class, av->grh.hop_limit, df, xnet);
364
365 dst_release(dst);
366 return 0;
367}
368
369static int prepare6(struct rxe_pkt_info *pkt, struct sk_buff *skb)
370{
371 struct rxe_qp *qp = pkt->qp;
372 struct dst_entry *dst;
373 struct rxe_av *av = rxe_get_av(pkt);
374 struct in6_addr *saddr = &av->sgid_addr._sockaddr_in6.sin6_addr;
375 struct in6_addr *daddr = &av->dgid_addr._sockaddr_in6.sin6_addr;
376
377 dst = rxe_find_route(skb->dev, qp, av);
378 if (!dst) {
379 pr_err("Host not reachable\n");
380 return -EHOSTUNREACH;
381 }
382
383 prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
384 cpu_to_be16(ROCE_V2_UDP_DPORT));
385
386 prepare_ipv6_hdr(dst, skb, saddr, daddr, IPPROTO_UDP,
387 av->grh.traffic_class,
388 av->grh.hop_limit);
389
390 dst_release(dst);
391 return 0;
392}
393
394int rxe_prepare(struct rxe_pkt_info *pkt, struct sk_buff *skb, u32 *crc)
395{
396 int err = 0;
397
398 if (skb->protocol == htons(ETH_P_IP))
399 err = prepare4(pkt, skb);
400 else if (skb->protocol == htons(ETH_P_IPV6))
401 err = prepare6(pkt, skb);
402
403 *crc = rxe_icrc_hdr(pkt, skb);
404
405 if (ether_addr_equal(skb->dev->dev_addr, rxe_get_av(pkt)->dmac))
406 pkt->mask |= RXE_LOOPBACK_MASK;
407
408 return err;
409}
410
411static void rxe_skb_tx_dtor(struct sk_buff *skb)
412{
413 struct sock *sk = skb->sk;
414 struct rxe_qp *qp = sk->sk_user_data;
415 int skb_out = atomic_dec_return(&qp->skb_out);
416
417 if (unlikely(qp->need_req_skb &&
418 skb_out < RXE_INFLIGHT_SKBS_PER_QP_LOW))
419 rxe_run_task(&qp->req.task, 1);
420
421 rxe_drop_ref(qp);
422}
423
424int rxe_send(struct rxe_pkt_info *pkt, struct sk_buff *skb)
425{
426 int err;
427
428 skb->destructor = rxe_skb_tx_dtor;
429 skb->sk = pkt->qp->sk->sk;
430
431 rxe_add_ref(pkt->qp);
432 atomic_inc(&pkt->qp->skb_out);
433
434 if (skb->protocol == htons(ETH_P_IP)) {
435 err = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
436 } else if (skb->protocol == htons(ETH_P_IPV6)) {
437 err = ip6_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
438 } else {
439 pr_err("Unknown layer 3 protocol: %d\n", skb->protocol);
440 atomic_dec(&pkt->qp->skb_out);
441 rxe_drop_ref(pkt->qp);
442 kfree_skb(skb);
443 return -EINVAL;
444 }
445
446 if (unlikely(net_xmit_eval(err))) {
447 pr_debug("error sending packet: %d\n", err);
448 return -EAGAIN;
449 }
450
451 return 0;
452}
453
454void rxe_loopback(struct sk_buff *skb)
455{
456 rxe_rcv(skb);
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(&rxe->ib_dev, port_num, av->grh.sgid_index);
469 if (IS_ERR(attr))
470 return NULL;
471
472 if (av->network_type == RDMA_NETWORK_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(ndev)) {
482 rcu_read_unlock();
483 goto out;
484 }
485 skb = alloc_skb(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, hdr_len + LL_RESERVED_SPACE(ndev));
494
495
496 skb->dev = ndev;
497 rcu_read_unlock();
498
499 if (av->network_type == RDMA_NETWORK_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_zero(skb, paylen);
507 pkt->mask |= RXE_GRH_MASK;
508
509out:
510 rdma_put_gid_attr(attr);
511 return skb;
512}
513
514
515
516
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, ndev->mtu, ibdev_name);
535 if (err) {
536 ib_dealloc_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(&ev);
553}
554
555
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, IB_EVENT_PORT_ACTIVE);
564 dev_info(&rxe->ib_dev.dev, "set active\n");
565}
566
567
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, IB_EVENT_PORT_ERR);
576 rxe_counter_inc(rxe, 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(rxe->ndev) && netif_carrier_ok(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(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(&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 pr_info("%s changed mtu to %d\n", ndev->name, ndev->mtu);
610 rxe_set_mtu(rxe, 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 pr_info("ignoring netdev event = %ld for %s\n",
622 event, ndev->name);
623 break;
624 }
625
626 ib_device_put(&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(&init_net,
637 htons(ROCE_V2_UDP_DPORT), false);
638 if (IS_ERR(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(&init_net,
652 htons(ROCE_V2_UDP_DPORT), true);
653 if (IS_ERR(recv_sockets.sk6)) {
654 recv_sockets.sk6 = NULL;
655 pr_err("Failed to create IPv6 UDP tunnel\n");
656 return -1;
657 }
658#endif
659 return 0;
660}
661
662void rxe_net_exit(void)
663{
664 rxe_release_udp_tunnel(recv_sockets.sk6);
665 rxe_release_udp_tunnel(recv_sockets.sk4);
666 unregister_netdevice_notifier(&rxe_net_notifier);
667}
668
669int rxe_net_init(void)
670{
671 int err;
672
673 recv_sockets.sk6 = NULL;
674
675 err = rxe_net_ipv4_init();
676 if (err)
677 return err;
678 err = rxe_net_ipv6_init();
679 if (err)
680 goto err_out;
681 err = register_netdevice_notifier(&rxe_net_notifier);
682 if (err) {
683 pr_err("Failed to register netdev notifier\n");
684 goto err_out;
685 }
686 return 0;
687err_out:
688 rxe_net_exit();
689 return err;
690}
691
