80e2119f1c7010ead3c493c60c511c125d6c7149
[sfrench/cifs-2.6.git] / net / smc / af_smc.c
1 /*
2  *  Shared Memory Communications over RDMA (SMC-R) and RoCE
3  *
4  *  AF_SMC protocol family socket handler keeping the AF_INET sock address type
5  *  applies to SOCK_STREAM sockets only
6  *  offers an alternative communication option for TCP-protocol sockets
7  *  applicable with RoCE-cards only
8  *
9  *  Initial restrictions:
10  *    - support for alternate links postponed
11  *
12  *  Copyright IBM Corp. 2016, 2018
13  *
14  *  Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
15  *              based on prototype from Frank Blaschka
16  */
17
18 #define KMSG_COMPONENT "smc"
19 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
20
21 #include <linux/module.h>
22 #include <linux/socket.h>
23 #include <linux/workqueue.h>
24 #include <linux/in.h>
25 #include <linux/sched/signal.h>
26 #include <linux/if_vlan.h>
27
28 #include <net/sock.h>
29 #include <net/tcp.h>
30 #include <net/smc.h>
31 #include <asm/ioctls.h>
32
33 #include "smc.h"
34 #include "smc_clc.h"
35 #include "smc_llc.h"
36 #include "smc_cdc.h"
37 #include "smc_core.h"
38 #include "smc_ib.h"
39 #include "smc_ism.h"
40 #include "smc_pnet.h"
41 #include "smc_tx.h"
42 #include "smc_rx.h"
43 #include "smc_close.h"
44
45 static DEFINE_MUTEX(smc_create_lgr_pending);    /* serialize link group
46                                                  * creation
47                                                  */
48
49 static void smc_tcp_listen_work(struct work_struct *);
50 static void smc_connect_work(struct work_struct *);
51
52 static void smc_set_keepalive(struct sock *sk, int val)
53 {
54         struct smc_sock *smc = smc_sk(sk);
55
56         smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
57 }
58
59 static struct smc_hashinfo smc_v4_hashinfo = {
60         .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
61 };
62
63 static struct smc_hashinfo smc_v6_hashinfo = {
64         .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
65 };
66
67 int smc_hash_sk(struct sock *sk)
68 {
69         struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
70         struct hlist_head *head;
71
72         head = &h->ht;
73
74         write_lock_bh(&h->lock);
75         sk_add_node(sk, head);
76         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
77         write_unlock_bh(&h->lock);
78
79         return 0;
80 }
81 EXPORT_SYMBOL_GPL(smc_hash_sk);
82
83 void smc_unhash_sk(struct sock *sk)
84 {
85         struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
86
87         write_lock_bh(&h->lock);
88         if (sk_del_node_init(sk))
89                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
90         write_unlock_bh(&h->lock);
91 }
92 EXPORT_SYMBOL_GPL(smc_unhash_sk);
93
94 struct proto smc_proto = {
95         .name           = "SMC",
96         .owner          = THIS_MODULE,
97         .keepalive      = smc_set_keepalive,
98         .hash           = smc_hash_sk,
99         .unhash         = smc_unhash_sk,
100         .obj_size       = sizeof(struct smc_sock),
101         .h.smc_hash     = &smc_v4_hashinfo,
102         .slab_flags     = SLAB_TYPESAFE_BY_RCU,
103 };
104 EXPORT_SYMBOL_GPL(smc_proto);
105
106 struct proto smc_proto6 = {
107         .name           = "SMC6",
108         .owner          = THIS_MODULE,
109         .keepalive      = smc_set_keepalive,
110         .hash           = smc_hash_sk,
111         .unhash         = smc_unhash_sk,
112         .obj_size       = sizeof(struct smc_sock),
113         .h.smc_hash     = &smc_v6_hashinfo,
114         .slab_flags     = SLAB_TYPESAFE_BY_RCU,
115 };
116 EXPORT_SYMBOL_GPL(smc_proto6);
117
118 static int smc_release(struct socket *sock)
119 {
120         struct sock *sk = sock->sk;
121         struct smc_sock *smc;
122         int rc = 0;
123
124         if (!sk)
125                 goto out;
126
127         smc = smc_sk(sk);
128
129         /* cleanup for a dangling non-blocking connect */
130         flush_work(&smc->connect_work);
131         kfree(smc->connect_info);
132         smc->connect_info = NULL;
133
134         if (sk->sk_state == SMC_LISTEN)
135                 /* smc_close_non_accepted() is called and acquires
136                  * sock lock for child sockets again
137                  */
138                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
139         else
140                 lock_sock(sk);
141
142         if (!smc->use_fallback) {
143                 rc = smc_close_active(smc);
144                 sock_set_flag(sk, SOCK_DEAD);
145                 sk->sk_shutdown |= SHUTDOWN_MASK;
146         }
147         if (smc->clcsock) {
148                 sock_release(smc->clcsock);
149                 smc->clcsock = NULL;
150         }
151         if (smc->use_fallback) {
152                 if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT)
153                         sock_put(sk); /* passive closing */
154                 sk->sk_state = SMC_CLOSED;
155                 sk->sk_state_change(sk);
156         }
157
158         /* detach socket */
159         sock_orphan(sk);
160         sock->sk = NULL;
161         if (!smc->use_fallback && sk->sk_state == SMC_CLOSED)
162                 smc_conn_free(&smc->conn);
163         release_sock(sk);
164
165         sk->sk_prot->unhash(sk);
166         sock_put(sk); /* final sock_put */
167 out:
168         return rc;
169 }
170
171 static void smc_destruct(struct sock *sk)
172 {
173         if (sk->sk_state != SMC_CLOSED)
174                 return;
175         if (!sock_flag(sk, SOCK_DEAD))
176                 return;
177
178         sk_refcnt_debug_dec(sk);
179 }
180
181 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
182                                    int protocol)
183 {
184         struct smc_sock *smc;
185         struct proto *prot;
186         struct sock *sk;
187
188         prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
189         sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
190         if (!sk)
191                 return NULL;
192
193         sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
194         sk->sk_state = SMC_INIT;
195         sk->sk_destruct = smc_destruct;
196         sk->sk_protocol = protocol;
197         smc = smc_sk(sk);
198         INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
199         INIT_WORK(&smc->connect_work, smc_connect_work);
200         INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
201         INIT_LIST_HEAD(&smc->accept_q);
202         spin_lock_init(&smc->accept_q_lock);
203         spin_lock_init(&smc->conn.send_lock);
204         sk->sk_prot->hash(sk);
205         sk_refcnt_debug_inc(sk);
206
207         return sk;
208 }
209
210 static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
211                     int addr_len)
212 {
213         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
214         struct sock *sk = sock->sk;
215         struct smc_sock *smc;
216         int rc;
217
218         smc = smc_sk(sk);
219
220         /* replicate tests from inet_bind(), to be safe wrt. future changes */
221         rc = -EINVAL;
222         if (addr_len < sizeof(struct sockaddr_in))
223                 goto out;
224
225         rc = -EAFNOSUPPORT;
226         if (addr->sin_family != AF_INET &&
227             addr->sin_family != AF_INET6 &&
228             addr->sin_family != AF_UNSPEC)
229                 goto out;
230         /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
231         if (addr->sin_family == AF_UNSPEC &&
232             addr->sin_addr.s_addr != htonl(INADDR_ANY))
233                 goto out;
234
235         lock_sock(sk);
236
237         /* Check if socket is already active */
238         rc = -EINVAL;
239         if (sk->sk_state != SMC_INIT)
240                 goto out_rel;
241
242         smc->clcsock->sk->sk_reuse = sk->sk_reuse;
243         rc = kernel_bind(smc->clcsock, uaddr, addr_len);
244
245 out_rel:
246         release_sock(sk);
247 out:
248         return rc;
249 }
250
251 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
252                                    unsigned long mask)
253 {
254         /* options we don't get control via setsockopt for */
255         nsk->sk_type = osk->sk_type;
256         nsk->sk_sndbuf = osk->sk_sndbuf;
257         nsk->sk_rcvbuf = osk->sk_rcvbuf;
258         nsk->sk_sndtimeo = osk->sk_sndtimeo;
259         nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
260         nsk->sk_mark = osk->sk_mark;
261         nsk->sk_priority = osk->sk_priority;
262         nsk->sk_rcvlowat = osk->sk_rcvlowat;
263         nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
264         nsk->sk_err = osk->sk_err;
265
266         nsk->sk_flags &= ~mask;
267         nsk->sk_flags |= osk->sk_flags & mask;
268 }
269
270 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
271                              (1UL << SOCK_KEEPOPEN) | \
272                              (1UL << SOCK_LINGER) | \
273                              (1UL << SOCK_BROADCAST) | \
274                              (1UL << SOCK_TIMESTAMP) | \
275                              (1UL << SOCK_DBG) | \
276                              (1UL << SOCK_RCVTSTAMP) | \
277                              (1UL << SOCK_RCVTSTAMPNS) | \
278                              (1UL << SOCK_LOCALROUTE) | \
279                              (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
280                              (1UL << SOCK_RXQ_OVFL) | \
281                              (1UL << SOCK_WIFI_STATUS) | \
282                              (1UL << SOCK_NOFCS) | \
283                              (1UL << SOCK_FILTER_LOCKED))
284 /* copy only relevant settings and flags of SOL_SOCKET level from smc to
285  * clc socket (since smc is not called for these options from net/core)
286  */
287 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
288 {
289         smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
290 }
291
292 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
293                              (1UL << SOCK_KEEPOPEN) | \
294                              (1UL << SOCK_LINGER) | \
295                              (1UL << SOCK_DBG))
296 /* copy only settings and flags relevant for smc from clc to smc socket */
297 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
298 {
299         smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
300 }
301
302 /* register a new rmb, optionally send confirm_rkey msg to register with peer */
303 static int smc_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc,
304                        bool conf_rkey)
305 {
306         /* register memory region for new rmb */
307         if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) {
308                 rmb_desc->regerr = 1;
309                 return -EFAULT;
310         }
311         if (!conf_rkey)
312                 return 0;
313         /* exchange confirm_rkey msg with peer */
314         if (smc_llc_do_confirm_rkey(link, rmb_desc)) {
315                 rmb_desc->regerr = 1;
316                 return -EFAULT;
317         }
318         return 0;
319 }
320
321 static int smc_clnt_conf_first_link(struct smc_sock *smc)
322 {
323         struct net *net = sock_net(smc->clcsock->sk);
324         struct smc_link_group *lgr = smc->conn.lgr;
325         struct smc_link *link;
326         int rest;
327         int rc;
328
329         link = &lgr->lnk[SMC_SINGLE_LINK];
330         /* receive CONFIRM LINK request from server over RoCE fabric */
331         rest = wait_for_completion_interruptible_timeout(
332                 &link->llc_confirm,
333                 SMC_LLC_WAIT_FIRST_TIME);
334         if (rest <= 0) {
335                 struct smc_clc_msg_decline dclc;
336
337                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
338                                       SMC_CLC_DECLINE);
339                 return rc;
340         }
341
342         if (link->llc_confirm_rc)
343                 return SMC_CLC_DECL_RMBE_EC;
344
345         rc = smc_ib_modify_qp_rts(link);
346         if (rc)
347                 return SMC_CLC_DECL_ERR_RDYLNK;
348
349         smc_wr_remember_qp_attr(link);
350
351         if (smc_reg_rmb(link, smc->conn.rmb_desc, false))
352                 return SMC_CLC_DECL_ERR_REGRMB;
353
354         /* send CONFIRM LINK response over RoCE fabric */
355         rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
356         if (rc < 0)
357                 return SMC_CLC_DECL_TIMEOUT_CL;
358
359         /* receive ADD LINK request from server over RoCE fabric */
360         rest = wait_for_completion_interruptible_timeout(&link->llc_add,
361                                                          SMC_LLC_WAIT_TIME);
362         if (rest <= 0) {
363                 struct smc_clc_msg_decline dclc;
364
365                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
366                                       SMC_CLC_DECLINE);
367                 return rc;
368         }
369
370         /* send add link reject message, only one link supported for now */
371         rc = smc_llc_send_add_link(link,
372                                    link->smcibdev->mac[link->ibport - 1],
373                                    link->gid, SMC_LLC_RESP);
374         if (rc < 0)
375                 return SMC_CLC_DECL_TIMEOUT_AL;
376
377         smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time);
378
379         return 0;
380 }
381
382 static void smcr_conn_save_peer_info(struct smc_sock *smc,
383                                      struct smc_clc_msg_accept_confirm *clc)
384 {
385         int bufsize = smc_uncompress_bufsize(clc->rmbe_size);
386
387         smc->conn.peer_rmbe_idx = clc->rmbe_idx;
388         smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token);
389         smc->conn.peer_rmbe_size = bufsize;
390         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
391         smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
392 }
393
394 static void smcd_conn_save_peer_info(struct smc_sock *smc,
395                                      struct smc_clc_msg_accept_confirm *clc)
396 {
397         int bufsize = smc_uncompress_bufsize(clc->dmbe_size);
398
399         smc->conn.peer_rmbe_idx = clc->dmbe_idx;
400         smc->conn.peer_token = clc->token;
401         /* msg header takes up space in the buffer */
402         smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
403         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
404         smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
405 }
406
407 static void smc_conn_save_peer_info(struct smc_sock *smc,
408                                     struct smc_clc_msg_accept_confirm *clc)
409 {
410         if (smc->conn.lgr->is_smcd)
411                 smcd_conn_save_peer_info(smc, clc);
412         else
413                 smcr_conn_save_peer_info(smc, clc);
414 }
415
416 static void smc_link_save_peer_info(struct smc_link *link,
417                                     struct smc_clc_msg_accept_confirm *clc)
418 {
419         link->peer_qpn = ntoh24(clc->qpn);
420         memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE);
421         memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac));
422         link->peer_psn = ntoh24(clc->psn);
423         link->peer_mtu = clc->qp_mtu;
424 }
425
426 /* fall back during connect */
427 static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
428 {
429         smc->use_fallback = true;
430         smc->fallback_rsn = reason_code;
431         smc_copy_sock_settings_to_clc(smc);
432         if (smc->sk.sk_state == SMC_INIT)
433                 smc->sk.sk_state = SMC_ACTIVE;
434         return 0;
435 }
436
437 /* decline and fall back during connect */
438 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code)
439 {
440         int rc;
441
442         if (reason_code < 0) { /* error, fallback is not possible */
443                 if (smc->sk.sk_state == SMC_INIT)
444                         sock_put(&smc->sk); /* passive closing */
445                 return reason_code;
446         }
447         if (reason_code != SMC_CLC_DECL_PEERDECL) {
448                 rc = smc_clc_send_decline(smc, reason_code);
449                 if (rc < 0) {
450                         if (smc->sk.sk_state == SMC_INIT)
451                                 sock_put(&smc->sk); /* passive closing */
452                         return rc;
453                 }
454         }
455         return smc_connect_fallback(smc, reason_code);
456 }
457
458 /* abort connecting */
459 static int smc_connect_abort(struct smc_sock *smc, int reason_code,
460                              int local_contact)
461 {
462         if (local_contact == SMC_FIRST_CONTACT)
463                 smc_lgr_forget(smc->conn.lgr);
464         mutex_unlock(&smc_create_lgr_pending);
465         smc_conn_free(&smc->conn);
466         return reason_code;
467 }
468
469 /* check if there is a rdma device available for this connection. */
470 /* called for connect and listen */
471 static int smc_check_rdma(struct smc_sock *smc, struct smc_ib_device **ibdev,
472                           u8 *ibport, unsigned short vlan_id, u8 gid[])
473 {
474         int reason_code = 0;
475
476         /* PNET table look up: search active ib_device and port
477          * within same PNETID that also contains the ethernet device
478          * used for the internal TCP socket
479          */
480         smc_pnet_find_roce_resource(smc->clcsock->sk, ibdev, ibport, vlan_id,
481                                     gid);
482         if (!(*ibdev))
483                 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
484
485         return reason_code;
486 }
487
488 /* check if there is an ISM device available for this connection. */
489 /* called for connect and listen */
490 static int smc_check_ism(struct smc_sock *smc, struct smcd_dev **ismdev)
491 {
492         /* Find ISM device with same PNETID as connecting interface  */
493         smc_pnet_find_ism_resource(smc->clcsock->sk, ismdev);
494         if (!(*ismdev))
495                 return SMC_CLC_DECL_CNFERR; /* configuration error */
496         return 0;
497 }
498
499 /* Check for VLAN ID and register it on ISM device just for CLC handshake */
500 static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
501                                       struct smcd_dev *ismdev,
502                                       unsigned short vlan_id)
503 {
504         if (vlan_id && smc_ism_get_vlan(ismdev, vlan_id))
505                 return SMC_CLC_DECL_CNFERR;
506         return 0;
507 }
508
509 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
510  * used, the VLAN ID will be registered again during the connection setup.
511  */
512 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, bool is_smcd,
513                                         struct smcd_dev *ismdev,
514                                         unsigned short vlan_id)
515 {
516         if (!is_smcd)
517                 return 0;
518         if (vlan_id && smc_ism_put_vlan(ismdev, vlan_id))
519                 return SMC_CLC_DECL_CNFERR;
520         return 0;
521 }
522
523 /* CLC handshake during connect */
524 static int smc_connect_clc(struct smc_sock *smc, int smc_type,
525                            struct smc_clc_msg_accept_confirm *aclc,
526                            struct smc_ib_device *ibdev, u8 ibport,
527                            u8 gid[], struct smcd_dev *ismdev)
528 {
529         int rc = 0;
530
531         /* do inband token exchange */
532         rc = smc_clc_send_proposal(smc, smc_type, ibdev, ibport, gid, ismdev);
533         if (rc)
534                 return rc;
535         /* receive SMC Accept CLC message */
536         return smc_clc_wait_msg(smc, aclc, sizeof(*aclc), SMC_CLC_ACCEPT);
537 }
538
539 /* setup for RDMA connection of client */
540 static int smc_connect_rdma(struct smc_sock *smc,
541                             struct smc_clc_msg_accept_confirm *aclc,
542                             struct smc_ib_device *ibdev, u8 ibport)
543 {
544         int local_contact = SMC_FIRST_CONTACT;
545         struct smc_link *link;
546         int reason_code = 0;
547
548         mutex_lock(&smc_create_lgr_pending);
549         local_contact = smc_conn_create(smc, false, aclc->hdr.flag, ibdev,
550                                         ibport, &aclc->lcl, NULL, 0);
551         if (local_contact < 0) {
552                 if (local_contact == -ENOMEM)
553                         reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
554                 else if (local_contact == -ENOLINK)
555                         reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */
556                 else
557                         reason_code = SMC_CLC_DECL_INTERR; /* other error */
558                 return smc_connect_abort(smc, reason_code, 0);
559         }
560         link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK];
561
562         smc_conn_save_peer_info(smc, aclc);
563
564         /* create send buffer and rmb */
565         if (smc_buf_create(smc, false))
566                 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact);
567
568         if (local_contact == SMC_FIRST_CONTACT)
569                 smc_link_save_peer_info(link, aclc);
570
571         if (smc_rmb_rtoken_handling(&smc->conn, aclc))
572                 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RTOK,
573                                          local_contact);
574
575         smc_close_init(smc);
576         smc_rx_init(smc);
577
578         if (local_contact == SMC_FIRST_CONTACT) {
579                 if (smc_ib_ready_link(link))
580                         return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RDYLNK,
581                                                  local_contact);
582         } else {
583                 if (!smc->conn.rmb_desc->reused &&
584                     smc_reg_rmb(link, smc->conn.rmb_desc, true))
585                         return smc_connect_abort(smc, SMC_CLC_DECL_ERR_REGRMB,
586                                                  local_contact);
587         }
588         smc_rmb_sync_sg_for_device(&smc->conn);
589
590         reason_code = smc_clc_send_confirm(smc);
591         if (reason_code)
592                 return smc_connect_abort(smc, reason_code, local_contact);
593
594         smc_tx_init(smc);
595
596         if (local_contact == SMC_FIRST_CONTACT) {
597                 /* QP confirmation over RoCE fabric */
598                 reason_code = smc_clnt_conf_first_link(smc);
599                 if (reason_code)
600                         return smc_connect_abort(smc, reason_code,
601                                                  local_contact);
602         }
603         mutex_unlock(&smc_create_lgr_pending);
604
605         smc_copy_sock_settings_to_clc(smc);
606         if (smc->sk.sk_state == SMC_INIT)
607                 smc->sk.sk_state = SMC_ACTIVE;
608
609         return 0;
610 }
611
612 /* setup for ISM connection of client */
613 static int smc_connect_ism(struct smc_sock *smc,
614                            struct smc_clc_msg_accept_confirm *aclc,
615                            struct smcd_dev *ismdev)
616 {
617         int local_contact = SMC_FIRST_CONTACT;
618         int rc = 0;
619
620         mutex_lock(&smc_create_lgr_pending);
621         local_contact = smc_conn_create(smc, true, aclc->hdr.flag, NULL, 0,
622                                         NULL, ismdev, aclc->gid);
623         if (local_contact < 0)
624                 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, 0);
625
626         /* Create send and receive buffers */
627         if (smc_buf_create(smc, true))
628                 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact);
629
630         smc_conn_save_peer_info(smc, aclc);
631         smc_close_init(smc);
632         smc_rx_init(smc);
633         smc_tx_init(smc);
634
635         rc = smc_clc_send_confirm(smc);
636         if (rc)
637                 return smc_connect_abort(smc, rc, local_contact);
638         mutex_unlock(&smc_create_lgr_pending);
639
640         smc_copy_sock_settings_to_clc(smc);
641         if (smc->sk.sk_state == SMC_INIT)
642                 smc->sk.sk_state = SMC_ACTIVE;
643
644         return 0;
645 }
646
647 /* perform steps before actually connecting */
648 static int __smc_connect(struct smc_sock *smc)
649 {
650         bool ism_supported = false, rdma_supported = false;
651         struct smc_clc_msg_accept_confirm aclc;
652         struct smc_ib_device *ibdev;
653         struct smcd_dev *ismdev;
654         u8 gid[SMC_GID_SIZE];
655         unsigned short vlan;
656         int smc_type;
657         int rc = 0;
658         u8 ibport;
659
660         sock_hold(&smc->sk); /* sock put in passive closing */
661
662         if (smc->use_fallback)
663                 return smc_connect_fallback(smc, smc->fallback_rsn);
664
665         /* if peer has not signalled SMC-capability, fall back */
666         if (!tcp_sk(smc->clcsock->sk)->syn_smc)
667                 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
668
669         /* IPSec connections opt out of SMC-R optimizations */
670         if (using_ipsec(smc))
671                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC);
672
673         /* check for VLAN ID */
674         if (smc_vlan_by_tcpsk(smc->clcsock, &vlan))
675                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_CNFERR);
676
677         /* check if there is an ism device available */
678         if (!smc_check_ism(smc, &ismdev) &&
679             !smc_connect_ism_vlan_setup(smc, ismdev, vlan)) {
680                 /* ISM is supported for this connection */
681                 ism_supported = true;
682                 smc_type = SMC_TYPE_D;
683         }
684
685         /* check if there is a rdma device available */
686         if (!smc_check_rdma(smc, &ibdev, &ibport, vlan, gid)) {
687                 /* RDMA is supported for this connection */
688                 rdma_supported = true;
689                 if (ism_supported)
690                         smc_type = SMC_TYPE_B; /* both */
691                 else
692                         smc_type = SMC_TYPE_R; /* only RDMA */
693         }
694
695         /* if neither ISM nor RDMA are supported, fallback */
696         if (!rdma_supported && !ism_supported)
697                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_NOSMCDEV);
698
699         /* perform CLC handshake */
700         rc = smc_connect_clc(smc, smc_type, &aclc, ibdev, ibport, gid, ismdev);
701         if (rc) {
702                 smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan);
703                 return smc_connect_decline_fallback(smc, rc);
704         }
705
706         /* depending on previous steps, connect using rdma or ism */
707         if (rdma_supported && aclc.hdr.path == SMC_TYPE_R)
708                 rc = smc_connect_rdma(smc, &aclc, ibdev, ibport);
709         else if (ism_supported && aclc.hdr.path == SMC_TYPE_D)
710                 rc = smc_connect_ism(smc, &aclc, ismdev);
711         else
712                 rc = SMC_CLC_DECL_MODEUNSUPP;
713         if (rc) {
714                 smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan);
715                 return smc_connect_decline_fallback(smc, rc);
716         }
717
718         smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan);
719         return 0;
720 }
721
722 static void smc_connect_work(struct work_struct *work)
723 {
724         struct smc_sock *smc = container_of(work, struct smc_sock,
725                                             connect_work);
726         int rc;
727
728         lock_sock(&smc->sk);
729         rc = kernel_connect(smc->clcsock, &smc->connect_info->addr,
730                             smc->connect_info->alen, smc->connect_info->flags);
731         if (smc->clcsock->sk->sk_err) {
732                 smc->sk.sk_err = smc->clcsock->sk->sk_err;
733                 goto out;
734         }
735         if (rc < 0) {
736                 smc->sk.sk_err = -rc;
737                 goto out;
738         }
739
740         rc = __smc_connect(smc);
741         if (rc < 0)
742                 smc->sk.sk_err = -rc;
743
744 out:
745         if (smc->sk.sk_err)
746                 smc->sk.sk_state_change(&smc->sk);
747         else
748                 smc->sk.sk_write_space(&smc->sk);
749         kfree(smc->connect_info);
750         smc->connect_info = NULL;
751         release_sock(&smc->sk);
752 }
753
754 static int smc_connect(struct socket *sock, struct sockaddr *addr,
755                        int alen, int flags)
756 {
757         struct sock *sk = sock->sk;
758         struct smc_sock *smc;
759         int rc = -EINVAL;
760
761         smc = smc_sk(sk);
762
763         /* separate smc parameter checking to be safe */
764         if (alen < sizeof(addr->sa_family))
765                 goto out_err;
766         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
767                 goto out_err;
768
769         lock_sock(sk);
770         switch (sk->sk_state) {
771         default:
772                 goto out;
773         case SMC_ACTIVE:
774                 rc = -EISCONN;
775                 goto out;
776         case SMC_INIT:
777                 rc = 0;
778                 break;
779         }
780
781         smc_copy_sock_settings_to_clc(smc);
782         tcp_sk(smc->clcsock->sk)->syn_smc = 1;
783         if (flags & O_NONBLOCK) {
784                 if (smc->connect_info) {
785                         rc = -EALREADY;
786                         goto out;
787                 }
788                 smc->connect_info = kzalloc(alen + 2 * sizeof(int), GFP_KERNEL);
789                 if (!smc->connect_info) {
790                         rc = -ENOMEM;
791                         goto out;
792                 }
793                 smc->connect_info->alen = alen;
794                 smc->connect_info->flags = flags ^ O_NONBLOCK;
795                 memcpy(&smc->connect_info->addr, addr, alen);
796                 schedule_work(&smc->connect_work);
797                 rc = -EINPROGRESS;
798         } else {
799                 rc = kernel_connect(smc->clcsock, addr, alen, flags);
800                 if (rc)
801                         goto out;
802
803                 rc = __smc_connect(smc);
804                 if (rc < 0)
805                         goto out;
806                 else
807                         rc = 0; /* success cases including fallback */
808         }
809
810 out:
811         release_sock(sk);
812 out_err:
813         return rc;
814 }
815
816 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
817 {
818         struct socket *new_clcsock = NULL;
819         struct sock *lsk = &lsmc->sk;
820         struct sock *new_sk;
821         int rc;
822
823         release_sock(lsk);
824         new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
825         if (!new_sk) {
826                 rc = -ENOMEM;
827                 lsk->sk_err = ENOMEM;
828                 *new_smc = NULL;
829                 lock_sock(lsk);
830                 goto out;
831         }
832         *new_smc = smc_sk(new_sk);
833
834         rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0);
835         lock_sock(lsk);
836         if  (rc < 0)
837                 lsk->sk_err = -rc;
838         if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
839                 if (new_clcsock)
840                         sock_release(new_clcsock);
841                 new_sk->sk_state = SMC_CLOSED;
842                 sock_set_flag(new_sk, SOCK_DEAD);
843                 new_sk->sk_prot->unhash(new_sk);
844                 sock_put(new_sk); /* final */
845                 *new_smc = NULL;
846                 goto out;
847         }
848
849         (*new_smc)->clcsock = new_clcsock;
850 out:
851         return rc;
852 }
853
854 /* add a just created sock to the accept queue of the listen sock as
855  * candidate for a following socket accept call from user space
856  */
857 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
858 {
859         struct smc_sock *par = smc_sk(parent);
860
861         sock_hold(sk); /* sock_put in smc_accept_unlink () */
862         spin_lock(&par->accept_q_lock);
863         list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
864         spin_unlock(&par->accept_q_lock);
865         sk_acceptq_added(parent);
866 }
867
868 /* remove a socket from the accept queue of its parental listening socket */
869 static void smc_accept_unlink(struct sock *sk)
870 {
871         struct smc_sock *par = smc_sk(sk)->listen_smc;
872
873         spin_lock(&par->accept_q_lock);
874         list_del_init(&smc_sk(sk)->accept_q);
875         spin_unlock(&par->accept_q_lock);
876         sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
877         sock_put(sk); /* sock_hold in smc_accept_enqueue */
878 }
879
880 /* remove a sock from the accept queue to bind it to a new socket created
881  * for a socket accept call from user space
882  */
883 struct sock *smc_accept_dequeue(struct sock *parent,
884                                 struct socket *new_sock)
885 {
886         struct smc_sock *isk, *n;
887         struct sock *new_sk;
888
889         list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
890                 new_sk = (struct sock *)isk;
891
892                 smc_accept_unlink(new_sk);
893                 if (new_sk->sk_state == SMC_CLOSED) {
894                         if (isk->clcsock) {
895                                 sock_release(isk->clcsock);
896                                 isk->clcsock = NULL;
897                         }
898                         new_sk->sk_prot->unhash(new_sk);
899                         sock_put(new_sk); /* final */
900                         continue;
901                 }
902                 if (new_sock)
903                         sock_graft(new_sk, new_sock);
904                 return new_sk;
905         }
906         return NULL;
907 }
908
909 /* clean up for a created but never accepted sock */
910 void smc_close_non_accepted(struct sock *sk)
911 {
912         struct smc_sock *smc = smc_sk(sk);
913
914         lock_sock(sk);
915         if (!sk->sk_lingertime)
916                 /* wait for peer closing */
917                 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
918         if (!smc->use_fallback) {
919                 smc_close_active(smc);
920                 sock_set_flag(sk, SOCK_DEAD);
921                 sk->sk_shutdown |= SHUTDOWN_MASK;
922         }
923         if (smc->clcsock) {
924                 struct socket *tcp;
925
926                 tcp = smc->clcsock;
927                 smc->clcsock = NULL;
928                 sock_release(tcp);
929         }
930         if (smc->use_fallback) {
931                 sock_put(sk); /* passive closing */
932                 sk->sk_state = SMC_CLOSED;
933         } else {
934                 if (sk->sk_state == SMC_CLOSED)
935                         smc_conn_free(&smc->conn);
936         }
937         release_sock(sk);
938         sk->sk_prot->unhash(sk);
939         sock_put(sk); /* final sock_put */
940 }
941
942 static int smc_serv_conf_first_link(struct smc_sock *smc)
943 {
944         struct net *net = sock_net(smc->clcsock->sk);
945         struct smc_link_group *lgr = smc->conn.lgr;
946         struct smc_link *link;
947         int rest;
948         int rc;
949
950         link = &lgr->lnk[SMC_SINGLE_LINK];
951
952         if (smc_reg_rmb(link, smc->conn.rmb_desc, false))
953                 return SMC_CLC_DECL_ERR_REGRMB;
954
955         /* send CONFIRM LINK request to client over the RoCE fabric */
956         rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
957         if (rc < 0)
958                 return SMC_CLC_DECL_TIMEOUT_CL;
959
960         /* receive CONFIRM LINK response from client over the RoCE fabric */
961         rest = wait_for_completion_interruptible_timeout(
962                 &link->llc_confirm_resp,
963                 SMC_LLC_WAIT_FIRST_TIME);
964         if (rest <= 0) {
965                 struct smc_clc_msg_decline dclc;
966
967                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
968                                       SMC_CLC_DECLINE);
969                 return rc;
970         }
971
972         if (link->llc_confirm_resp_rc)
973                 return SMC_CLC_DECL_RMBE_EC;
974
975         /* send ADD LINK request to client over the RoCE fabric */
976         rc = smc_llc_send_add_link(link,
977                                    link->smcibdev->mac[link->ibport - 1],
978                                    link->gid, SMC_LLC_REQ);
979         if (rc < 0)
980                 return SMC_CLC_DECL_TIMEOUT_AL;
981
982         /* receive ADD LINK response from client over the RoCE fabric */
983         rest = wait_for_completion_interruptible_timeout(&link->llc_add_resp,
984                                                          SMC_LLC_WAIT_TIME);
985         if (rest <= 0) {
986                 struct smc_clc_msg_decline dclc;
987
988                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
989                                       SMC_CLC_DECLINE);
990                 return rc;
991         }
992
993         smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time);
994
995         return 0;
996 }
997
998 /* listen worker: finish */
999 static void smc_listen_out(struct smc_sock *new_smc)
1000 {
1001         struct smc_sock *lsmc = new_smc->listen_smc;
1002         struct sock *newsmcsk = &new_smc->sk;
1003
1004         lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
1005         if (lsmc->sk.sk_state == SMC_LISTEN) {
1006                 smc_accept_enqueue(&lsmc->sk, newsmcsk);
1007         } else { /* no longer listening */
1008                 smc_close_non_accepted(newsmcsk);
1009         }
1010         release_sock(&lsmc->sk);
1011
1012         /* Wake up accept */
1013         lsmc->sk.sk_data_ready(&lsmc->sk);
1014         sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1015 }
1016
1017 /* listen worker: finish in state connected */
1018 static void smc_listen_out_connected(struct smc_sock *new_smc)
1019 {
1020         struct sock *newsmcsk = &new_smc->sk;
1021
1022         sk_refcnt_debug_inc(newsmcsk);
1023         if (newsmcsk->sk_state == SMC_INIT)
1024                 newsmcsk->sk_state = SMC_ACTIVE;
1025
1026         smc_listen_out(new_smc);
1027 }
1028
1029 /* listen worker: finish in error state */
1030 static void smc_listen_out_err(struct smc_sock *new_smc)
1031 {
1032         struct sock *newsmcsk = &new_smc->sk;
1033
1034         if (newsmcsk->sk_state == SMC_INIT)
1035                 sock_put(&new_smc->sk); /* passive closing */
1036         newsmcsk->sk_state = SMC_CLOSED;
1037         smc_conn_free(&new_smc->conn);
1038
1039         smc_listen_out(new_smc);
1040 }
1041
1042 /* listen worker: decline and fall back if possible */
1043 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
1044                                int local_contact)
1045 {
1046         /* RDMA setup failed, switch back to TCP */
1047         if (local_contact == SMC_FIRST_CONTACT)
1048                 smc_lgr_forget(new_smc->conn.lgr);
1049         if (reason_code < 0) { /* error, no fallback possible */
1050                 smc_listen_out_err(new_smc);
1051                 return;
1052         }
1053         smc_conn_free(&new_smc->conn);
1054         new_smc->use_fallback = true;
1055         new_smc->fallback_rsn = reason_code;
1056         if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
1057                 if (smc_clc_send_decline(new_smc, reason_code) < 0) {
1058                         smc_listen_out_err(new_smc);
1059                         return;
1060                 }
1061         }
1062         smc_listen_out_connected(new_smc);
1063 }
1064
1065 /* listen worker: check prefixes */
1066 static int smc_listen_rdma_check(struct smc_sock *new_smc,
1067                                  struct smc_clc_msg_proposal *pclc)
1068 {
1069         struct smc_clc_msg_proposal_prefix *pclc_prfx;
1070         struct socket *newclcsock = new_smc->clcsock;
1071
1072         pclc_prfx = smc_clc_proposal_get_prefix(pclc);
1073         if (smc_clc_prfx_match(newclcsock, pclc_prfx))
1074                 return SMC_CLC_DECL_CNFERR;
1075
1076         return 0;
1077 }
1078
1079 /* listen worker: initialize connection and buffers */
1080 static int smc_listen_rdma_init(struct smc_sock *new_smc,
1081                                 struct smc_clc_msg_proposal *pclc,
1082                                 struct smc_ib_device *ibdev, u8 ibport,
1083                                 int *local_contact)
1084 {
1085         /* allocate connection / link group */
1086         *local_contact = smc_conn_create(new_smc, false, 0, ibdev, ibport,
1087                                          &pclc->lcl, NULL, 0);
1088         if (*local_contact < 0) {
1089                 if (*local_contact == -ENOMEM)
1090                         return SMC_CLC_DECL_MEM;/* insufficient memory*/
1091                 return SMC_CLC_DECL_INTERR; /* other error */
1092         }
1093
1094         /* create send buffer and rmb */
1095         if (smc_buf_create(new_smc, false))
1096                 return SMC_CLC_DECL_MEM;
1097
1098         return 0;
1099 }
1100
1101 /* listen worker: initialize connection and buffers for SMC-D */
1102 static int smc_listen_ism_init(struct smc_sock *new_smc,
1103                                struct smc_clc_msg_proposal *pclc,
1104                                struct smcd_dev *ismdev,
1105                                int *local_contact)
1106 {
1107         struct smc_clc_msg_smcd *pclc_smcd;
1108
1109         pclc_smcd = smc_get_clc_msg_smcd(pclc);
1110         *local_contact = smc_conn_create(new_smc, true, 0, NULL, 0, NULL,
1111                                          ismdev, pclc_smcd->gid);
1112         if (*local_contact < 0) {
1113                 if (*local_contact == -ENOMEM)
1114                         return SMC_CLC_DECL_MEM;/* insufficient memory*/
1115                 return SMC_CLC_DECL_INTERR; /* other error */
1116         }
1117
1118         /* Check if peer can be reached via ISM device */
1119         if (smc_ism_cantalk(new_smc->conn.lgr->peer_gid,
1120                             new_smc->conn.lgr->vlan_id,
1121                             new_smc->conn.lgr->smcd)) {
1122                 if (*local_contact == SMC_FIRST_CONTACT)
1123                         smc_lgr_forget(new_smc->conn.lgr);
1124                 smc_conn_free(&new_smc->conn);
1125                 return SMC_CLC_DECL_CNFERR;
1126         }
1127
1128         /* Create send and receive buffers */
1129         if (smc_buf_create(new_smc, true)) {
1130                 if (*local_contact == SMC_FIRST_CONTACT)
1131                         smc_lgr_forget(new_smc->conn.lgr);
1132                 smc_conn_free(&new_smc->conn);
1133                 return SMC_CLC_DECL_MEM;
1134         }
1135
1136         return 0;
1137 }
1138
1139 /* listen worker: register buffers */
1140 static int smc_listen_rdma_reg(struct smc_sock *new_smc, int local_contact)
1141 {
1142         struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
1143
1144         if (local_contact != SMC_FIRST_CONTACT) {
1145                 if (!new_smc->conn.rmb_desc->reused) {
1146                         if (smc_reg_rmb(link, new_smc->conn.rmb_desc, true))
1147                                 return SMC_CLC_DECL_ERR_REGRMB;
1148                 }
1149         }
1150         smc_rmb_sync_sg_for_device(&new_smc->conn);
1151
1152         return 0;
1153 }
1154
1155 /* listen worker: finish RDMA setup */
1156 static int smc_listen_rdma_finish(struct smc_sock *new_smc,
1157                                   struct smc_clc_msg_accept_confirm *cclc,
1158                                   int local_contact)
1159 {
1160         struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
1161         int reason_code = 0;
1162
1163         if (local_contact == SMC_FIRST_CONTACT)
1164                 smc_link_save_peer_info(link, cclc);
1165
1166         if (smc_rmb_rtoken_handling(&new_smc->conn, cclc)) {
1167                 reason_code = SMC_CLC_DECL_ERR_RTOK;
1168                 goto decline;
1169         }
1170
1171         if (local_contact == SMC_FIRST_CONTACT) {
1172                 if (smc_ib_ready_link(link)) {
1173                         reason_code = SMC_CLC_DECL_ERR_RDYLNK;
1174                         goto decline;
1175                 }
1176                 /* QP confirmation over RoCE fabric */
1177                 reason_code = smc_serv_conf_first_link(new_smc);
1178                 if (reason_code)
1179                         goto decline;
1180         }
1181         return 0;
1182
1183 decline:
1184         mutex_unlock(&smc_create_lgr_pending);
1185         smc_listen_decline(new_smc, reason_code, local_contact);
1186         return reason_code;
1187 }
1188
1189 /* setup for RDMA connection of server */
1190 static void smc_listen_work(struct work_struct *work)
1191 {
1192         struct smc_sock *new_smc = container_of(work, struct smc_sock,
1193                                                 smc_listen_work);
1194         struct socket *newclcsock = new_smc->clcsock;
1195         struct smc_clc_msg_accept_confirm cclc;
1196         struct smc_clc_msg_proposal *pclc;
1197         struct smc_ib_device *ibdev;
1198         bool ism_supported = false;
1199         struct smcd_dev *ismdev;
1200         u8 buf[SMC_CLC_MAX_LEN];
1201         int local_contact = 0;
1202         unsigned short vlan;
1203         int reason_code = 0;
1204         int rc = 0;
1205         u8 ibport;
1206
1207         if (new_smc->use_fallback) {
1208                 smc_listen_out_connected(new_smc);
1209                 return;
1210         }
1211
1212         /* check if peer is smc capable */
1213         if (!tcp_sk(newclcsock->sk)->syn_smc) {
1214                 new_smc->use_fallback = true;
1215                 new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC;
1216                 smc_listen_out_connected(new_smc);
1217                 return;
1218         }
1219
1220         /* do inband token exchange -
1221          * wait for and receive SMC Proposal CLC message
1222          */
1223         pclc = (struct smc_clc_msg_proposal *)&buf;
1224         reason_code = smc_clc_wait_msg(new_smc, pclc, SMC_CLC_MAX_LEN,
1225                                        SMC_CLC_PROPOSAL);
1226         if (reason_code) {
1227                 smc_listen_decline(new_smc, reason_code, 0);
1228                 return;
1229         }
1230
1231         /* IPSec connections opt out of SMC-R optimizations */
1232         if (using_ipsec(new_smc)) {
1233                 smc_listen_decline(new_smc, SMC_CLC_DECL_IPSEC, 0);
1234                 return;
1235         }
1236
1237         mutex_lock(&smc_create_lgr_pending);
1238         smc_close_init(new_smc);
1239         smc_rx_init(new_smc);
1240         smc_tx_init(new_smc);
1241
1242         /* check if ISM is available */
1243         if ((pclc->hdr.path == SMC_TYPE_D || pclc->hdr.path == SMC_TYPE_B) &&
1244             !smc_check_ism(new_smc, &ismdev) &&
1245             !smc_listen_ism_init(new_smc, pclc, ismdev, &local_contact)) {
1246                 ism_supported = true;
1247         }
1248
1249         /* check if RDMA is available */
1250         if (!ism_supported &&
1251             ((pclc->hdr.path != SMC_TYPE_R && pclc->hdr.path != SMC_TYPE_B) ||
1252              smc_vlan_by_tcpsk(new_smc->clcsock, &vlan) ||
1253              smc_check_rdma(new_smc, &ibdev, &ibport, vlan, NULL) ||
1254              smc_listen_rdma_check(new_smc, pclc) ||
1255              smc_listen_rdma_init(new_smc, pclc, ibdev, ibport,
1256                                   &local_contact) ||
1257              smc_listen_rdma_reg(new_smc, local_contact))) {
1258                 /* SMC not supported, decline */
1259                 mutex_unlock(&smc_create_lgr_pending);
1260                 smc_listen_decline(new_smc, SMC_CLC_DECL_MODEUNSUPP,
1261                                    local_contact);
1262                 return;
1263         }
1264
1265         /* send SMC Accept CLC message */
1266         rc = smc_clc_send_accept(new_smc, local_contact);
1267         if (rc) {
1268                 mutex_unlock(&smc_create_lgr_pending);
1269                 smc_listen_decline(new_smc, rc, local_contact);
1270                 return;
1271         }
1272
1273         /* receive SMC Confirm CLC message */
1274         reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
1275                                        SMC_CLC_CONFIRM);
1276         if (reason_code) {
1277                 mutex_unlock(&smc_create_lgr_pending);
1278                 smc_listen_decline(new_smc, reason_code, local_contact);
1279                 return;
1280         }
1281
1282         /* finish worker */
1283         if (!ism_supported) {
1284                 if (smc_listen_rdma_finish(new_smc, &cclc, local_contact))
1285                         return;
1286         }
1287         smc_conn_save_peer_info(new_smc, &cclc);
1288         mutex_unlock(&smc_create_lgr_pending);
1289         smc_listen_out_connected(new_smc);
1290 }
1291
1292 static void smc_tcp_listen_work(struct work_struct *work)
1293 {
1294         struct smc_sock *lsmc = container_of(work, struct smc_sock,
1295                                              tcp_listen_work);
1296         struct sock *lsk = &lsmc->sk;
1297         struct smc_sock *new_smc;
1298         int rc = 0;
1299
1300         lock_sock(lsk);
1301         while (lsk->sk_state == SMC_LISTEN) {
1302                 rc = smc_clcsock_accept(lsmc, &new_smc);
1303                 if (rc)
1304                         goto out;
1305                 if (!new_smc)
1306                         continue;
1307
1308                 new_smc->listen_smc = lsmc;
1309                 new_smc->use_fallback = lsmc->use_fallback;
1310                 new_smc->fallback_rsn = lsmc->fallback_rsn;
1311                 sock_hold(lsk); /* sock_put in smc_listen_work */
1312                 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
1313                 smc_copy_sock_settings_to_smc(new_smc);
1314                 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf;
1315                 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf;
1316                 sock_hold(&new_smc->sk); /* sock_put in passive closing */
1317                 if (!schedule_work(&new_smc->smc_listen_work))
1318                         sock_put(&new_smc->sk);
1319         }
1320
1321 out:
1322         release_sock(lsk);
1323         sock_put(&lsmc->sk); /* sock_hold in smc_listen */
1324 }
1325
1326 static int smc_listen(struct socket *sock, int backlog)
1327 {
1328         struct sock *sk = sock->sk;
1329         struct smc_sock *smc;
1330         int rc;
1331
1332         smc = smc_sk(sk);
1333         lock_sock(sk);
1334
1335         rc = -EINVAL;
1336         if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN))
1337                 goto out;
1338
1339         rc = 0;
1340         if (sk->sk_state == SMC_LISTEN) {
1341                 sk->sk_max_ack_backlog = backlog;
1342                 goto out;
1343         }
1344         /* some socket options are handled in core, so we could not apply
1345          * them to the clc socket -- copy smc socket options to clc socket
1346          */
1347         smc_copy_sock_settings_to_clc(smc);
1348         if (!smc->use_fallback)
1349                 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1350
1351         rc = kernel_listen(smc->clcsock, backlog);
1352         if (rc)
1353                 goto out;
1354         sk->sk_max_ack_backlog = backlog;
1355         sk->sk_ack_backlog = 0;
1356         sk->sk_state = SMC_LISTEN;
1357         INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
1358         sock_hold(sk); /* sock_hold in tcp_listen_worker */
1359         if (!schedule_work(&smc->tcp_listen_work))
1360                 sock_put(sk);
1361
1362 out:
1363         release_sock(sk);
1364         return rc;
1365 }
1366
1367 static int smc_accept(struct socket *sock, struct socket *new_sock,
1368                       int flags, bool kern)
1369 {
1370         struct sock *sk = sock->sk, *nsk;
1371         DECLARE_WAITQUEUE(wait, current);
1372         struct smc_sock *lsmc;
1373         long timeo;
1374         int rc = 0;
1375
1376         lsmc = smc_sk(sk);
1377         sock_hold(sk); /* sock_put below */
1378         lock_sock(sk);
1379
1380         if (lsmc->sk.sk_state != SMC_LISTEN) {
1381                 rc = -EINVAL;
1382                 release_sock(sk);
1383                 goto out;
1384         }
1385
1386         /* Wait for an incoming connection */
1387         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1388         add_wait_queue_exclusive(sk_sleep(sk), &wait);
1389         while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
1390                 set_current_state(TASK_INTERRUPTIBLE);
1391                 if (!timeo) {
1392                         rc = -EAGAIN;
1393                         break;
1394                 }
1395                 release_sock(sk);
1396                 timeo = schedule_timeout(timeo);
1397                 /* wakeup by sk_data_ready in smc_listen_work() */
1398                 sched_annotate_sleep();
1399                 lock_sock(sk);
1400                 if (signal_pending(current)) {
1401                         rc = sock_intr_errno(timeo);
1402                         break;
1403                 }
1404         }
1405         set_current_state(TASK_RUNNING);
1406         remove_wait_queue(sk_sleep(sk), &wait);
1407
1408         if (!rc)
1409                 rc = sock_error(nsk);
1410         release_sock(sk);
1411         if (rc)
1412                 goto out;
1413
1414         if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
1415                 /* wait till data arrives on the socket */
1416                 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
1417                                                                 MSEC_PER_SEC);
1418                 if (smc_sk(nsk)->use_fallback) {
1419                         struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
1420
1421                         lock_sock(clcsk);
1422                         if (skb_queue_empty(&clcsk->sk_receive_queue))
1423                                 sk_wait_data(clcsk, &timeo, NULL);
1424                         release_sock(clcsk);
1425                 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
1426                         lock_sock(nsk);
1427                         smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
1428                         release_sock(nsk);
1429                 }
1430         }
1431
1432 out:
1433         sock_put(sk); /* sock_hold above */
1434         return rc;
1435 }
1436
1437 static int smc_getname(struct socket *sock, struct sockaddr *addr,
1438                        int peer)
1439 {
1440         struct smc_sock *smc;
1441
1442         if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
1443             (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
1444                 return -ENOTCONN;
1445
1446         smc = smc_sk(sock->sk);
1447
1448         return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
1449 }
1450
1451 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1452 {
1453         struct sock *sk = sock->sk;
1454         struct smc_sock *smc;
1455         int rc = -EPIPE;
1456
1457         smc = smc_sk(sk);
1458         lock_sock(sk);
1459         if ((sk->sk_state != SMC_ACTIVE) &&
1460             (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1461             (sk->sk_state != SMC_INIT))
1462                 goto out;
1463
1464         if (msg->msg_flags & MSG_FASTOPEN) {
1465                 if (sk->sk_state == SMC_INIT) {
1466                         smc->use_fallback = true;
1467                         smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
1468                 } else {
1469                         rc = -EINVAL;
1470                         goto out;
1471                 }
1472         }
1473
1474         if (smc->use_fallback)
1475                 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
1476         else
1477                 rc = smc_tx_sendmsg(smc, msg, len);
1478 out:
1479         release_sock(sk);
1480         return rc;
1481 }
1482
1483 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1484                        int flags)
1485 {
1486         struct sock *sk = sock->sk;
1487         struct smc_sock *smc;
1488         int rc = -ENOTCONN;
1489
1490         smc = smc_sk(sk);
1491         lock_sock(sk);
1492         if ((sk->sk_state == SMC_INIT) ||
1493             (sk->sk_state == SMC_LISTEN) ||
1494             (sk->sk_state == SMC_CLOSED))
1495                 goto out;
1496
1497         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1498                 rc = 0;
1499                 goto out;
1500         }
1501
1502         if (smc->use_fallback) {
1503                 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
1504         } else {
1505                 msg->msg_namelen = 0;
1506                 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
1507         }
1508
1509 out:
1510         release_sock(sk);
1511         return rc;
1512 }
1513
1514 static __poll_t smc_accept_poll(struct sock *parent)
1515 {
1516         struct smc_sock *isk = smc_sk(parent);
1517         __poll_t mask = 0;
1518
1519         spin_lock(&isk->accept_q_lock);
1520         if (!list_empty(&isk->accept_q))
1521                 mask = EPOLLIN | EPOLLRDNORM;
1522         spin_unlock(&isk->accept_q_lock);
1523
1524         return mask;
1525 }
1526
1527 static __poll_t smc_poll(struct file *file, struct socket *sock,
1528                              poll_table *wait)
1529 {
1530         struct sock *sk = sock->sk;
1531         __poll_t mask = 0;
1532         struct smc_sock *smc;
1533
1534         if (!sk)
1535                 return EPOLLNVAL;
1536
1537         smc = smc_sk(sock->sk);
1538         if (smc->use_fallback) {
1539                 /* delegate to CLC child sock */
1540                 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
1541                 sk->sk_err = smc->clcsock->sk->sk_err;
1542                 if (sk->sk_err)
1543                         mask |= EPOLLERR;
1544         } else {
1545                 if (sk->sk_state != SMC_CLOSED)
1546                         sock_poll_wait(file, sock, wait);
1547                 if (sk->sk_err)
1548                         mask |= EPOLLERR;
1549                 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
1550                     (sk->sk_state == SMC_CLOSED))
1551                         mask |= EPOLLHUP;
1552                 if (sk->sk_state == SMC_LISTEN) {
1553                         /* woken up by sk_data_ready in smc_listen_work() */
1554                         mask = smc_accept_poll(sk);
1555                 } else {
1556                         if (atomic_read(&smc->conn.sndbuf_space) ||
1557                             sk->sk_shutdown & SEND_SHUTDOWN) {
1558                                 mask |= EPOLLOUT | EPOLLWRNORM;
1559                         } else {
1560                                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1561                                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1562                         }
1563                         if (atomic_read(&smc->conn.bytes_to_rcv))
1564                                 mask |= EPOLLIN | EPOLLRDNORM;
1565                         if (sk->sk_shutdown & RCV_SHUTDOWN)
1566                                 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
1567                         if (sk->sk_state == SMC_APPCLOSEWAIT1)
1568                                 mask |= EPOLLIN;
1569                         if (smc->conn.urg_state == SMC_URG_VALID)
1570                                 mask |= EPOLLPRI;
1571                 }
1572         }
1573
1574         return mask;
1575 }
1576
1577 static int smc_shutdown(struct socket *sock, int how)
1578 {
1579         struct sock *sk = sock->sk;
1580         struct smc_sock *smc;
1581         int rc = -EINVAL;
1582         int rc1 = 0;
1583
1584         smc = smc_sk(sk);
1585
1586         if ((how < SHUT_RD) || (how > SHUT_RDWR))
1587                 return rc;
1588
1589         lock_sock(sk);
1590
1591         rc = -ENOTCONN;
1592         if ((sk->sk_state != SMC_ACTIVE) &&
1593             (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
1594             (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
1595             (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1596             (sk->sk_state != SMC_APPCLOSEWAIT2) &&
1597             (sk->sk_state != SMC_APPFINCLOSEWAIT))
1598                 goto out;
1599         if (smc->use_fallback) {
1600                 rc = kernel_sock_shutdown(smc->clcsock, how);
1601                 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
1602                 if (sk->sk_shutdown == SHUTDOWN_MASK)
1603                         sk->sk_state = SMC_CLOSED;
1604                 goto out;
1605         }
1606         switch (how) {
1607         case SHUT_RDWR:         /* shutdown in both directions */
1608                 rc = smc_close_active(smc);
1609                 break;
1610         case SHUT_WR:
1611                 rc = smc_close_shutdown_write(smc);
1612                 break;
1613         case SHUT_RD:
1614                 rc = 0;
1615                 /* nothing more to do because peer is not involved */
1616                 break;
1617         }
1618         if (smc->clcsock)
1619                 rc1 = kernel_sock_shutdown(smc->clcsock, how);
1620         /* map sock_shutdown_cmd constants to sk_shutdown value range */
1621         sk->sk_shutdown |= how + 1;
1622
1623 out:
1624         release_sock(sk);
1625         return rc ? rc : rc1;
1626 }
1627
1628 static int smc_setsockopt(struct socket *sock, int level, int optname,
1629                           char __user *optval, unsigned int optlen)
1630 {
1631         struct sock *sk = sock->sk;
1632         struct smc_sock *smc;
1633         int val, rc;
1634
1635         smc = smc_sk(sk);
1636
1637         /* generic setsockopts reaching us here always apply to the
1638          * CLC socket
1639          */
1640         rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
1641                                            optval, optlen);
1642         if (smc->clcsock->sk->sk_err) {
1643                 sk->sk_err = smc->clcsock->sk->sk_err;
1644                 sk->sk_error_report(sk);
1645         }
1646         if (rc)
1647                 return rc;
1648
1649         if (optlen < sizeof(int))
1650                 return -EINVAL;
1651         if (get_user(val, (int __user *)optval))
1652                 return -EFAULT;
1653
1654         lock_sock(sk);
1655         switch (optname) {
1656         case TCP_ULP:
1657         case TCP_FASTOPEN:
1658         case TCP_FASTOPEN_CONNECT:
1659         case TCP_FASTOPEN_KEY:
1660         case TCP_FASTOPEN_NO_COOKIE:
1661                 /* option not supported by SMC */
1662                 if (sk->sk_state == SMC_INIT) {
1663                         smc->use_fallback = true;
1664                         smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
1665                 } else {
1666                         if (!smc->use_fallback)
1667                                 rc = -EINVAL;
1668                 }
1669                 break;
1670         case TCP_NODELAY:
1671                 if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) {
1672                         if (val && !smc->use_fallback)
1673                                 mod_delayed_work(system_wq, &smc->conn.tx_work,
1674                                                  0);
1675                 }
1676                 break;
1677         case TCP_CORK:
1678                 if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) {
1679                         if (!val && !smc->use_fallback)
1680                                 mod_delayed_work(system_wq, &smc->conn.tx_work,
1681                                                  0);
1682                 }
1683                 break;
1684         case TCP_DEFER_ACCEPT:
1685                 smc->sockopt_defer_accept = val;
1686                 break;
1687         default:
1688                 break;
1689         }
1690         release_sock(sk);
1691
1692         return rc;
1693 }
1694
1695 static int smc_getsockopt(struct socket *sock, int level, int optname,
1696                           char __user *optval, int __user *optlen)
1697 {
1698         struct smc_sock *smc;
1699
1700         smc = smc_sk(sock->sk);
1701         /* socket options apply to the CLC socket */
1702         return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
1703                                              optval, optlen);
1704 }
1705
1706 static int smc_ioctl(struct socket *sock, unsigned int cmd,
1707                      unsigned long arg)
1708 {
1709         union smc_host_cursor cons, urg;
1710         struct smc_connection *conn;
1711         struct smc_sock *smc;
1712         int answ;
1713
1714         smc = smc_sk(sock->sk);
1715         conn = &smc->conn;
1716         lock_sock(&smc->sk);
1717         if (smc->use_fallback) {
1718                 if (!smc->clcsock) {
1719                         release_sock(&smc->sk);
1720                         return -EBADF;
1721                 }
1722                 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
1723                 release_sock(&smc->sk);
1724                 return answ;
1725         }
1726         switch (cmd) {
1727         case SIOCINQ: /* same as FIONREAD */
1728                 if (smc->sk.sk_state == SMC_LISTEN) {
1729                         release_sock(&smc->sk);
1730                         return -EINVAL;
1731                 }
1732                 if (smc->sk.sk_state == SMC_INIT ||
1733                     smc->sk.sk_state == SMC_CLOSED)
1734                         answ = 0;
1735                 else
1736                         answ = atomic_read(&smc->conn.bytes_to_rcv);
1737                 break;
1738         case SIOCOUTQ:
1739                 /* output queue size (not send + not acked) */
1740                 if (smc->sk.sk_state == SMC_LISTEN) {
1741                         release_sock(&smc->sk);
1742                         return -EINVAL;
1743                 }
1744                 if (smc->sk.sk_state == SMC_INIT ||
1745                     smc->sk.sk_state == SMC_CLOSED)
1746                         answ = 0;
1747                 else
1748                         answ = smc->conn.sndbuf_desc->len -
1749                                         atomic_read(&smc->conn.sndbuf_space);
1750                 break;
1751         case SIOCOUTQNSD:
1752                 /* output queue size (not send only) */
1753                 if (smc->sk.sk_state == SMC_LISTEN) {
1754                         release_sock(&smc->sk);
1755                         return -EINVAL;
1756                 }
1757                 if (smc->sk.sk_state == SMC_INIT ||
1758                     smc->sk.sk_state == SMC_CLOSED)
1759                         answ = 0;
1760                 else
1761                         answ = smc_tx_prepared_sends(&smc->conn);
1762                 break;
1763         case SIOCATMARK:
1764                 if (smc->sk.sk_state == SMC_LISTEN) {
1765                         release_sock(&smc->sk);
1766                         return -EINVAL;
1767                 }
1768                 if (smc->sk.sk_state == SMC_INIT ||
1769                     smc->sk.sk_state == SMC_CLOSED) {
1770                         answ = 0;
1771                 } else {
1772                         smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
1773                         smc_curs_copy(&urg, &conn->urg_curs, conn);
1774                         answ = smc_curs_diff(conn->rmb_desc->len,
1775                                              &cons, &urg) == 1;
1776                 }
1777                 break;
1778         default:
1779                 release_sock(&smc->sk);
1780                 return -ENOIOCTLCMD;
1781         }
1782         release_sock(&smc->sk);
1783
1784         return put_user(answ, (int __user *)arg);
1785 }
1786
1787 static ssize_t smc_sendpage(struct socket *sock, struct page *page,
1788                             int offset, size_t size, int flags)
1789 {
1790         struct sock *sk = sock->sk;
1791         struct smc_sock *smc;
1792         int rc = -EPIPE;
1793
1794         smc = smc_sk(sk);
1795         lock_sock(sk);
1796         if (sk->sk_state != SMC_ACTIVE) {
1797                 release_sock(sk);
1798                 goto out;
1799         }
1800         release_sock(sk);
1801         if (smc->use_fallback)
1802                 rc = kernel_sendpage(smc->clcsock, page, offset,
1803                                      size, flags);
1804         else
1805                 rc = sock_no_sendpage(sock, page, offset, size, flags);
1806
1807 out:
1808         return rc;
1809 }
1810
1811 /* Map the affected portions of the rmbe into an spd, note the number of bytes
1812  * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
1813  * updates till whenever a respective page has been fully processed.
1814  * Note that subsequent recv() calls have to wait till all splice() processing
1815  * completed.
1816  */
1817 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
1818                                struct pipe_inode_info *pipe, size_t len,
1819                                unsigned int flags)
1820 {
1821         struct sock *sk = sock->sk;
1822         struct smc_sock *smc;
1823         int rc = -ENOTCONN;
1824
1825         smc = smc_sk(sk);
1826         lock_sock(sk);
1827
1828         if (sk->sk_state == SMC_INIT ||
1829             sk->sk_state == SMC_LISTEN ||
1830             sk->sk_state == SMC_CLOSED)
1831                 goto out;
1832
1833         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1834                 rc = 0;
1835                 goto out;
1836         }
1837
1838         if (smc->use_fallback) {
1839                 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
1840                                                     pipe, len, flags);
1841         } else {
1842                 if (*ppos) {
1843                         rc = -ESPIPE;
1844                         goto out;
1845                 }
1846                 if (flags & SPLICE_F_NONBLOCK)
1847                         flags = MSG_DONTWAIT;
1848                 else
1849                         flags = 0;
1850                 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
1851         }
1852 out:
1853         release_sock(sk);
1854
1855         return rc;
1856 }
1857
1858 /* must look like tcp */
1859 static const struct proto_ops smc_sock_ops = {
1860         .family         = PF_SMC,
1861         .owner          = THIS_MODULE,
1862         .release        = smc_release,
1863         .bind           = smc_bind,
1864         .connect        = smc_connect,
1865         .socketpair     = sock_no_socketpair,
1866         .accept         = smc_accept,
1867         .getname        = smc_getname,
1868         .poll           = smc_poll,
1869         .ioctl          = smc_ioctl,
1870         .listen         = smc_listen,
1871         .shutdown       = smc_shutdown,
1872         .setsockopt     = smc_setsockopt,
1873         .getsockopt     = smc_getsockopt,
1874         .sendmsg        = smc_sendmsg,
1875         .recvmsg        = smc_recvmsg,
1876         .mmap           = sock_no_mmap,
1877         .sendpage       = smc_sendpage,
1878         .splice_read    = smc_splice_read,
1879 };
1880
1881 static int smc_create(struct net *net, struct socket *sock, int protocol,
1882                       int kern)
1883 {
1884         int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
1885         struct smc_sock *smc;
1886         struct sock *sk;
1887         int rc;
1888
1889         rc = -ESOCKTNOSUPPORT;
1890         if (sock->type != SOCK_STREAM)
1891                 goto out;
1892
1893         rc = -EPROTONOSUPPORT;
1894         if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
1895                 goto out;
1896
1897         rc = -ENOBUFS;
1898         sock->ops = &smc_sock_ops;
1899         sk = smc_sock_alloc(net, sock, protocol);
1900         if (!sk)
1901                 goto out;
1902
1903         /* create internal TCP socket for CLC handshake and fallback */
1904         smc = smc_sk(sk);
1905         smc->use_fallback = false; /* assume rdma capability first */
1906         smc->fallback_rsn = 0;
1907         rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
1908                               &smc->clcsock);
1909         if (rc) {
1910                 sk_common_release(sk);
1911                 goto out;
1912         }
1913         smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
1914         smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
1915
1916 out:
1917         return rc;
1918 }
1919
1920 static const struct net_proto_family smc_sock_family_ops = {
1921         .family = PF_SMC,
1922         .owner  = THIS_MODULE,
1923         .create = smc_create,
1924 };
1925
1926 static int __init smc_init(void)
1927 {
1928         int rc;
1929
1930         rc = smc_pnet_init();
1931         if (rc)
1932                 return rc;
1933
1934         rc = smc_llc_init();
1935         if (rc) {
1936                 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
1937                 goto out_pnet;
1938         }
1939
1940         rc = smc_cdc_init();
1941         if (rc) {
1942                 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
1943                 goto out_pnet;
1944         }
1945
1946         rc = proto_register(&smc_proto, 1);
1947         if (rc) {
1948                 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
1949                 goto out_pnet;
1950         }
1951
1952         rc = proto_register(&smc_proto6, 1);
1953         if (rc) {
1954                 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
1955                 goto out_proto;
1956         }
1957
1958         rc = sock_register(&smc_sock_family_ops);
1959         if (rc) {
1960                 pr_err("%s: sock_register fails with %d\n", __func__, rc);
1961                 goto out_proto6;
1962         }
1963         INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
1964         INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
1965
1966         rc = smc_ib_register_client();
1967         if (rc) {
1968                 pr_err("%s: ib_register fails with %d\n", __func__, rc);
1969                 goto out_sock;
1970         }
1971
1972         static_branch_enable(&tcp_have_smc);
1973         return 0;
1974
1975 out_sock:
1976         sock_unregister(PF_SMC);
1977 out_proto6:
1978         proto_unregister(&smc_proto6);
1979 out_proto:
1980         proto_unregister(&smc_proto);
1981 out_pnet:
1982         smc_pnet_exit();
1983         return rc;
1984 }
1985
1986 static void __exit smc_exit(void)
1987 {
1988         smc_core_exit();
1989         static_branch_disable(&tcp_have_smc);
1990         smc_ib_unregister_client();
1991         sock_unregister(PF_SMC);
1992         proto_unregister(&smc_proto6);
1993         proto_unregister(&smc_proto);
1994         smc_pnet_exit();
1995 }
1996
1997 module_init(smc_init);
1998 module_exit(smc_exit);
1999
2000 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
2001 MODULE_DESCRIPTION("smc socket address family");
2002 MODULE_LICENSE("GPL");
2003 MODULE_ALIAS_NETPROTO(PF_SMC);