net/smc: use queue pair number when matching link group
[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         if (smc->connect_info && sk->sk_state == SMC_INIT)
131                 tcp_abort(smc->clcsock->sk, ECONNABORTED);
132         flush_work(&smc->connect_work);
133         kfree(smc->connect_info);
134         smc->connect_info = NULL;
135
136         if (sk->sk_state == SMC_LISTEN)
137                 /* smc_close_non_accepted() is called and acquires
138                  * sock lock for child sockets again
139                  */
140                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
141         else
142                 lock_sock(sk);
143
144         if (!smc->use_fallback) {
145                 rc = smc_close_active(smc);
146                 sock_set_flag(sk, SOCK_DEAD);
147                 sk->sk_shutdown |= SHUTDOWN_MASK;
148         }
149         if (smc->clcsock) {
150                 sock_release(smc->clcsock);
151                 smc->clcsock = NULL;
152         }
153         if (smc->use_fallback) {
154                 if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT)
155                         sock_put(sk); /* passive closing */
156                 sk->sk_state = SMC_CLOSED;
157                 sk->sk_state_change(sk);
158         }
159
160         /* detach socket */
161         sock_orphan(sk);
162         sock->sk = NULL;
163         if (!smc->use_fallback && sk->sk_state == SMC_CLOSED)
164                 smc_conn_free(&smc->conn);
165         release_sock(sk);
166
167         sk->sk_prot->unhash(sk);
168         sock_put(sk); /* final sock_put */
169 out:
170         return rc;
171 }
172
173 static void smc_destruct(struct sock *sk)
174 {
175         if (sk->sk_state != SMC_CLOSED)
176                 return;
177         if (!sock_flag(sk, SOCK_DEAD))
178                 return;
179
180         sk_refcnt_debug_dec(sk);
181 }
182
183 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
184                                    int protocol)
185 {
186         struct smc_sock *smc;
187         struct proto *prot;
188         struct sock *sk;
189
190         prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
191         sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
192         if (!sk)
193                 return NULL;
194
195         sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
196         sk->sk_state = SMC_INIT;
197         sk->sk_destruct = smc_destruct;
198         sk->sk_protocol = protocol;
199         smc = smc_sk(sk);
200         INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
201         INIT_WORK(&smc->connect_work, smc_connect_work);
202         INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
203         INIT_LIST_HEAD(&smc->accept_q);
204         spin_lock_init(&smc->accept_q_lock);
205         spin_lock_init(&smc->conn.send_lock);
206         sk->sk_prot->hash(sk);
207         sk_refcnt_debug_inc(sk);
208
209         return sk;
210 }
211
212 static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
213                     int addr_len)
214 {
215         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
216         struct sock *sk = sock->sk;
217         struct smc_sock *smc;
218         int rc;
219
220         smc = smc_sk(sk);
221
222         /* replicate tests from inet_bind(), to be safe wrt. future changes */
223         rc = -EINVAL;
224         if (addr_len < sizeof(struct sockaddr_in))
225                 goto out;
226
227         rc = -EAFNOSUPPORT;
228         if (addr->sin_family != AF_INET &&
229             addr->sin_family != AF_INET6 &&
230             addr->sin_family != AF_UNSPEC)
231                 goto out;
232         /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
233         if (addr->sin_family == AF_UNSPEC &&
234             addr->sin_addr.s_addr != htonl(INADDR_ANY))
235                 goto out;
236
237         lock_sock(sk);
238
239         /* Check if socket is already active */
240         rc = -EINVAL;
241         if (sk->sk_state != SMC_INIT)
242                 goto out_rel;
243
244         smc->clcsock->sk->sk_reuse = sk->sk_reuse;
245         rc = kernel_bind(smc->clcsock, uaddr, addr_len);
246
247 out_rel:
248         release_sock(sk);
249 out:
250         return rc;
251 }
252
253 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
254                                    unsigned long mask)
255 {
256         /* options we don't get control via setsockopt for */
257         nsk->sk_type = osk->sk_type;
258         nsk->sk_sndbuf = osk->sk_sndbuf;
259         nsk->sk_rcvbuf = osk->sk_rcvbuf;
260         nsk->sk_sndtimeo = osk->sk_sndtimeo;
261         nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
262         nsk->sk_mark = osk->sk_mark;
263         nsk->sk_priority = osk->sk_priority;
264         nsk->sk_rcvlowat = osk->sk_rcvlowat;
265         nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
266         nsk->sk_err = osk->sk_err;
267
268         nsk->sk_flags &= ~mask;
269         nsk->sk_flags |= osk->sk_flags & mask;
270 }
271
272 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
273                              (1UL << SOCK_KEEPOPEN) | \
274                              (1UL << SOCK_LINGER) | \
275                              (1UL << SOCK_BROADCAST) | \
276                              (1UL << SOCK_TIMESTAMP) | \
277                              (1UL << SOCK_DBG) | \
278                              (1UL << SOCK_RCVTSTAMP) | \
279                              (1UL << SOCK_RCVTSTAMPNS) | \
280                              (1UL << SOCK_LOCALROUTE) | \
281                              (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
282                              (1UL << SOCK_RXQ_OVFL) | \
283                              (1UL << SOCK_WIFI_STATUS) | \
284                              (1UL << SOCK_NOFCS) | \
285                              (1UL << SOCK_FILTER_LOCKED))
286 /* copy only relevant settings and flags of SOL_SOCKET level from smc to
287  * clc socket (since smc is not called for these options from net/core)
288  */
289 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
290 {
291         smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
292 }
293
294 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
295                              (1UL << SOCK_KEEPOPEN) | \
296                              (1UL << SOCK_LINGER) | \
297                              (1UL << SOCK_DBG))
298 /* copy only settings and flags relevant for smc from clc to smc socket */
299 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
300 {
301         smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
302 }
303
304 /* register a new rmb, optionally send confirm_rkey msg to register with peer */
305 static int smc_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc,
306                        bool conf_rkey)
307 {
308         /* register memory region for new rmb */
309         if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) {
310                 rmb_desc->regerr = 1;
311                 return -EFAULT;
312         }
313         if (!conf_rkey)
314                 return 0;
315         /* exchange confirm_rkey msg with peer */
316         if (smc_llc_do_confirm_rkey(link, rmb_desc)) {
317                 rmb_desc->regerr = 1;
318                 return -EFAULT;
319         }
320         return 0;
321 }
322
323 static int smc_clnt_conf_first_link(struct smc_sock *smc)
324 {
325         struct net *net = sock_net(smc->clcsock->sk);
326         struct smc_link_group *lgr = smc->conn.lgr;
327         struct smc_link *link;
328         int rest;
329         int rc;
330
331         link = &lgr->lnk[SMC_SINGLE_LINK];
332         /* receive CONFIRM LINK request from server over RoCE fabric */
333         rest = wait_for_completion_interruptible_timeout(
334                 &link->llc_confirm,
335                 SMC_LLC_WAIT_FIRST_TIME);
336         if (rest <= 0) {
337                 struct smc_clc_msg_decline dclc;
338
339                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
340                                       SMC_CLC_DECLINE);
341                 return rc;
342         }
343
344         if (link->llc_confirm_rc)
345                 return SMC_CLC_DECL_RMBE_EC;
346
347         rc = smc_ib_modify_qp_rts(link);
348         if (rc)
349                 return SMC_CLC_DECL_ERR_RDYLNK;
350
351         smc_wr_remember_qp_attr(link);
352
353         if (smc_reg_rmb(link, smc->conn.rmb_desc, false))
354                 return SMC_CLC_DECL_ERR_REGRMB;
355
356         /* send CONFIRM LINK response over RoCE fabric */
357         rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
358         if (rc < 0)
359                 return SMC_CLC_DECL_TIMEOUT_CL;
360
361         /* receive ADD LINK request from server over RoCE fabric */
362         rest = wait_for_completion_interruptible_timeout(&link->llc_add,
363                                                          SMC_LLC_WAIT_TIME);
364         if (rest <= 0) {
365                 struct smc_clc_msg_decline dclc;
366
367                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
368                                       SMC_CLC_DECLINE);
369                 return rc;
370         }
371
372         /* send add link reject message, only one link supported for now */
373         rc = smc_llc_send_add_link(link,
374                                    link->smcibdev->mac[link->ibport - 1],
375                                    link->gid, SMC_LLC_RESP);
376         if (rc < 0)
377                 return SMC_CLC_DECL_TIMEOUT_AL;
378
379         smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time);
380
381         return 0;
382 }
383
384 static void smcr_conn_save_peer_info(struct smc_sock *smc,
385                                      struct smc_clc_msg_accept_confirm *clc)
386 {
387         int bufsize = smc_uncompress_bufsize(clc->rmbe_size);
388
389         smc->conn.peer_rmbe_idx = clc->rmbe_idx;
390         smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token);
391         smc->conn.peer_rmbe_size = bufsize;
392         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
393         smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
394 }
395
396 static void smcd_conn_save_peer_info(struct smc_sock *smc,
397                                      struct smc_clc_msg_accept_confirm *clc)
398 {
399         int bufsize = smc_uncompress_bufsize(clc->dmbe_size);
400
401         smc->conn.peer_rmbe_idx = clc->dmbe_idx;
402         smc->conn.peer_token = clc->token;
403         /* msg header takes up space in the buffer */
404         smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
405         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
406         smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
407 }
408
409 static void smc_conn_save_peer_info(struct smc_sock *smc,
410                                     struct smc_clc_msg_accept_confirm *clc)
411 {
412         if (smc->conn.lgr->is_smcd)
413                 smcd_conn_save_peer_info(smc, clc);
414         else
415                 smcr_conn_save_peer_info(smc, clc);
416 }
417
418 static void smc_link_save_peer_info(struct smc_link *link,
419                                     struct smc_clc_msg_accept_confirm *clc)
420 {
421         link->peer_qpn = ntoh24(clc->qpn);
422         memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE);
423         memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac));
424         link->peer_psn = ntoh24(clc->psn);
425         link->peer_mtu = clc->qp_mtu;
426 }
427
428 /* fall back during connect */
429 static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
430 {
431         smc->use_fallback = true;
432         smc->fallback_rsn = reason_code;
433         smc_copy_sock_settings_to_clc(smc);
434         if (smc->sk.sk_state == SMC_INIT)
435                 smc->sk.sk_state = SMC_ACTIVE;
436         return 0;
437 }
438
439 /* decline and fall back during connect */
440 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code)
441 {
442         int rc;
443
444         if (reason_code < 0) { /* error, fallback is not possible */
445                 if (smc->sk.sk_state == SMC_INIT)
446                         sock_put(&smc->sk); /* passive closing */
447                 return reason_code;
448         }
449         if (reason_code != SMC_CLC_DECL_PEERDECL) {
450                 rc = smc_clc_send_decline(smc, reason_code);
451                 if (rc < 0) {
452                         if (smc->sk.sk_state == SMC_INIT)
453                                 sock_put(&smc->sk); /* passive closing */
454                         return rc;
455                 }
456         }
457         return smc_connect_fallback(smc, reason_code);
458 }
459
460 /* abort connecting */
461 static int smc_connect_abort(struct smc_sock *smc, int reason_code,
462                              int local_contact)
463 {
464         if (local_contact == SMC_FIRST_CONTACT)
465                 smc_lgr_forget(smc->conn.lgr);
466         mutex_unlock(&smc_create_lgr_pending);
467         smc_conn_free(&smc->conn);
468         return reason_code;
469 }
470
471 /* check if there is a rdma device available for this connection. */
472 /* called for connect and listen */
473 static int smc_check_rdma(struct smc_sock *smc, struct smc_ib_device **ibdev,
474                           u8 *ibport, unsigned short vlan_id, u8 gid[])
475 {
476         int reason_code = 0;
477
478         /* PNET table look up: search active ib_device and port
479          * within same PNETID that also contains the ethernet device
480          * used for the internal TCP socket
481          */
482         smc_pnet_find_roce_resource(smc->clcsock->sk, ibdev, ibport, vlan_id,
483                                     gid);
484         if (!(*ibdev))
485                 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
486
487         return reason_code;
488 }
489
490 /* check if there is an ISM device available for this connection. */
491 /* called for connect and listen */
492 static int smc_check_ism(struct smc_sock *smc, struct smcd_dev **ismdev)
493 {
494         /* Find ISM device with same PNETID as connecting interface  */
495         smc_pnet_find_ism_resource(smc->clcsock->sk, ismdev);
496         if (!(*ismdev))
497                 return SMC_CLC_DECL_CNFERR; /* configuration error */
498         return 0;
499 }
500
501 /* Check for VLAN ID and register it on ISM device just for CLC handshake */
502 static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
503                                       struct smcd_dev *ismdev,
504                                       unsigned short vlan_id)
505 {
506         if (vlan_id && smc_ism_get_vlan(ismdev, vlan_id))
507                 return SMC_CLC_DECL_CNFERR;
508         return 0;
509 }
510
511 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
512  * used, the VLAN ID will be registered again during the connection setup.
513  */
514 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, bool is_smcd,
515                                         struct smcd_dev *ismdev,
516                                         unsigned short vlan_id)
517 {
518         if (!is_smcd)
519                 return 0;
520         if (vlan_id && smc_ism_put_vlan(ismdev, vlan_id))
521                 return SMC_CLC_DECL_CNFERR;
522         return 0;
523 }
524
525 /* CLC handshake during connect */
526 static int smc_connect_clc(struct smc_sock *smc, int smc_type,
527                            struct smc_clc_msg_accept_confirm *aclc,
528                            struct smc_ib_device *ibdev, u8 ibport,
529                            u8 gid[], struct smcd_dev *ismdev)
530 {
531         int rc = 0;
532
533         /* do inband token exchange */
534         rc = smc_clc_send_proposal(smc, smc_type, ibdev, ibport, gid, ismdev);
535         if (rc)
536                 return rc;
537         /* receive SMC Accept CLC message */
538         return smc_clc_wait_msg(smc, aclc, sizeof(*aclc), SMC_CLC_ACCEPT);
539 }
540
541 /* setup for RDMA connection of client */
542 static int smc_connect_rdma(struct smc_sock *smc,
543                             struct smc_clc_msg_accept_confirm *aclc,
544                             struct smc_ib_device *ibdev, u8 ibport)
545 {
546         int local_contact = SMC_FIRST_CONTACT;
547         struct smc_link *link;
548         int reason_code = 0;
549
550         mutex_lock(&smc_create_lgr_pending);
551         local_contact = smc_conn_create(smc, false, aclc->hdr.flag, ibdev,
552                                         ibport, ntoh24(aclc->qpn), &aclc->lcl,
553                                         NULL, 0);
554         if (local_contact < 0) {
555                 if (local_contact == -ENOMEM)
556                         reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
557                 else if (local_contact == -ENOLINK)
558                         reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */
559                 else
560                         reason_code = SMC_CLC_DECL_INTERR; /* other error */
561                 return smc_connect_abort(smc, reason_code, 0);
562         }
563         link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK];
564
565         smc_conn_save_peer_info(smc, aclc);
566
567         /* create send buffer and rmb */
568         if (smc_buf_create(smc, false))
569                 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact);
570
571         if (local_contact == SMC_FIRST_CONTACT)
572                 smc_link_save_peer_info(link, aclc);
573
574         if (smc_rmb_rtoken_handling(&smc->conn, aclc))
575                 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RTOK,
576                                          local_contact);
577
578         smc_close_init(smc);
579         smc_rx_init(smc);
580
581         if (local_contact == SMC_FIRST_CONTACT) {
582                 if (smc_ib_ready_link(link))
583                         return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RDYLNK,
584                                                  local_contact);
585         } else {
586                 if (!smc->conn.rmb_desc->reused &&
587                     smc_reg_rmb(link, smc->conn.rmb_desc, true))
588                         return smc_connect_abort(smc, SMC_CLC_DECL_ERR_REGRMB,
589                                                  local_contact);
590         }
591         smc_rmb_sync_sg_for_device(&smc->conn);
592
593         reason_code = smc_clc_send_confirm(smc);
594         if (reason_code)
595                 return smc_connect_abort(smc, reason_code, local_contact);
596
597         smc_tx_init(smc);
598
599         if (local_contact == SMC_FIRST_CONTACT) {
600                 /* QP confirmation over RoCE fabric */
601                 reason_code = smc_clnt_conf_first_link(smc);
602                 if (reason_code)
603                         return smc_connect_abort(smc, reason_code,
604                                                  local_contact);
605         }
606         mutex_unlock(&smc_create_lgr_pending);
607
608         smc_copy_sock_settings_to_clc(smc);
609         if (smc->sk.sk_state == SMC_INIT)
610                 smc->sk.sk_state = SMC_ACTIVE;
611
612         return 0;
613 }
614
615 /* setup for ISM connection of client */
616 static int smc_connect_ism(struct smc_sock *smc,
617                            struct smc_clc_msg_accept_confirm *aclc,
618                            struct smcd_dev *ismdev)
619 {
620         int local_contact = SMC_FIRST_CONTACT;
621         int rc = 0;
622
623         mutex_lock(&smc_create_lgr_pending);
624         local_contact = smc_conn_create(smc, true, aclc->hdr.flag, NULL, 0, 0,
625                                         NULL, ismdev, aclc->gid);
626         if (local_contact < 0)
627                 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, 0);
628
629         /* Create send and receive buffers */
630         if (smc_buf_create(smc, true))
631                 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact);
632
633         smc_conn_save_peer_info(smc, aclc);
634         smc_close_init(smc);
635         smc_rx_init(smc);
636         smc_tx_init(smc);
637
638         rc = smc_clc_send_confirm(smc);
639         if (rc)
640                 return smc_connect_abort(smc, rc, local_contact);
641         mutex_unlock(&smc_create_lgr_pending);
642
643         smc_copy_sock_settings_to_clc(smc);
644         if (smc->sk.sk_state == SMC_INIT)
645                 smc->sk.sk_state = SMC_ACTIVE;
646
647         return 0;
648 }
649
650 /* perform steps before actually connecting */
651 static int __smc_connect(struct smc_sock *smc)
652 {
653         bool ism_supported = false, rdma_supported = false;
654         struct smc_clc_msg_accept_confirm aclc;
655         struct smc_ib_device *ibdev;
656         struct smcd_dev *ismdev;
657         u8 gid[SMC_GID_SIZE];
658         unsigned short vlan;
659         int smc_type;
660         int rc = 0;
661         u8 ibport;
662
663         sock_hold(&smc->sk); /* sock put in passive closing */
664
665         if (smc->use_fallback)
666                 return smc_connect_fallback(smc, smc->fallback_rsn);
667
668         /* if peer has not signalled SMC-capability, fall back */
669         if (!tcp_sk(smc->clcsock->sk)->syn_smc)
670                 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
671
672         /* IPSec connections opt out of SMC-R optimizations */
673         if (using_ipsec(smc))
674                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC);
675
676         /* check for VLAN ID */
677         if (smc_vlan_by_tcpsk(smc->clcsock, &vlan))
678                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_CNFERR);
679
680         /* check if there is an ism device available */
681         if (!smc_check_ism(smc, &ismdev) &&
682             !smc_connect_ism_vlan_setup(smc, ismdev, vlan)) {
683                 /* ISM is supported for this connection */
684                 ism_supported = true;
685                 smc_type = SMC_TYPE_D;
686         }
687
688         /* check if there is a rdma device available */
689         if (!smc_check_rdma(smc, &ibdev, &ibport, vlan, gid)) {
690                 /* RDMA is supported for this connection */
691                 rdma_supported = true;
692                 if (ism_supported)
693                         smc_type = SMC_TYPE_B; /* both */
694                 else
695                         smc_type = SMC_TYPE_R; /* only RDMA */
696         }
697
698         /* if neither ISM nor RDMA are supported, fallback */
699         if (!rdma_supported && !ism_supported)
700                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_NOSMCDEV);
701
702         /* perform CLC handshake */
703         rc = smc_connect_clc(smc, smc_type, &aclc, ibdev, ibport, gid, ismdev);
704         if (rc) {
705                 smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan);
706                 return smc_connect_decline_fallback(smc, rc);
707         }
708
709         /* depending on previous steps, connect using rdma or ism */
710         if (rdma_supported && aclc.hdr.path == SMC_TYPE_R)
711                 rc = smc_connect_rdma(smc, &aclc, ibdev, ibport);
712         else if (ism_supported && aclc.hdr.path == SMC_TYPE_D)
713                 rc = smc_connect_ism(smc, &aclc, ismdev);
714         else
715                 rc = SMC_CLC_DECL_MODEUNSUPP;
716         if (rc) {
717                 smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan);
718                 return smc_connect_decline_fallback(smc, rc);
719         }
720
721         smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan);
722         return 0;
723 }
724
725 static void smc_connect_work(struct work_struct *work)
726 {
727         struct smc_sock *smc = container_of(work, struct smc_sock,
728                                             connect_work);
729         int rc;
730
731         lock_sock(&smc->sk);
732         rc = kernel_connect(smc->clcsock, &smc->connect_info->addr,
733                             smc->connect_info->alen, smc->connect_info->flags);
734         if (smc->clcsock->sk->sk_err) {
735                 smc->sk.sk_err = smc->clcsock->sk->sk_err;
736                 goto out;
737         }
738         if (rc < 0) {
739                 smc->sk.sk_err = -rc;
740                 goto out;
741         }
742
743         rc = __smc_connect(smc);
744         if (rc < 0)
745                 smc->sk.sk_err = -rc;
746
747 out:
748         if (smc->sk.sk_err)
749                 smc->sk.sk_state_change(&smc->sk);
750         else
751                 smc->sk.sk_write_space(&smc->sk);
752         kfree(smc->connect_info);
753         smc->connect_info = NULL;
754         release_sock(&smc->sk);
755 }
756
757 static int smc_connect(struct socket *sock, struct sockaddr *addr,
758                        int alen, int flags)
759 {
760         struct sock *sk = sock->sk;
761         struct smc_sock *smc;
762         int rc = -EINVAL;
763
764         smc = smc_sk(sk);
765
766         /* separate smc parameter checking to be safe */
767         if (alen < sizeof(addr->sa_family))
768                 goto out_err;
769         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
770                 goto out_err;
771
772         lock_sock(sk);
773         switch (sk->sk_state) {
774         default:
775                 goto out;
776         case SMC_ACTIVE:
777                 rc = -EISCONN;
778                 goto out;
779         case SMC_INIT:
780                 rc = 0;
781                 break;
782         }
783
784         smc_copy_sock_settings_to_clc(smc);
785         tcp_sk(smc->clcsock->sk)->syn_smc = 1;
786         if (flags & O_NONBLOCK) {
787                 if (smc->connect_info) {
788                         rc = -EALREADY;
789                         goto out;
790                 }
791                 smc->connect_info = kzalloc(alen + 2 * sizeof(int), GFP_KERNEL);
792                 if (!smc->connect_info) {
793                         rc = -ENOMEM;
794                         goto out;
795                 }
796                 smc->connect_info->alen = alen;
797                 smc->connect_info->flags = flags ^ O_NONBLOCK;
798                 memcpy(&smc->connect_info->addr, addr, alen);
799                 schedule_work(&smc->connect_work);
800                 rc = -EINPROGRESS;
801         } else {
802                 rc = kernel_connect(smc->clcsock, addr, alen, flags);
803                 if (rc)
804                         goto out;
805
806                 rc = __smc_connect(smc);
807                 if (rc < 0)
808                         goto out;
809                 else
810                         rc = 0; /* success cases including fallback */
811         }
812
813 out:
814         release_sock(sk);
815 out_err:
816         return rc;
817 }
818
819 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
820 {
821         struct socket *new_clcsock = NULL;
822         struct sock *lsk = &lsmc->sk;
823         struct sock *new_sk;
824         int rc;
825
826         release_sock(lsk);
827         new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
828         if (!new_sk) {
829                 rc = -ENOMEM;
830                 lsk->sk_err = ENOMEM;
831                 *new_smc = NULL;
832                 lock_sock(lsk);
833                 goto out;
834         }
835         *new_smc = smc_sk(new_sk);
836
837         rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0);
838         lock_sock(lsk);
839         if  (rc < 0)
840                 lsk->sk_err = -rc;
841         if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
842                 if (new_clcsock)
843                         sock_release(new_clcsock);
844                 new_sk->sk_state = SMC_CLOSED;
845                 sock_set_flag(new_sk, SOCK_DEAD);
846                 new_sk->sk_prot->unhash(new_sk);
847                 sock_put(new_sk); /* final */
848                 *new_smc = NULL;
849                 goto out;
850         }
851
852         (*new_smc)->clcsock = new_clcsock;
853 out:
854         return rc;
855 }
856
857 /* add a just created sock to the accept queue of the listen sock as
858  * candidate for a following socket accept call from user space
859  */
860 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
861 {
862         struct smc_sock *par = smc_sk(parent);
863
864         sock_hold(sk); /* sock_put in smc_accept_unlink () */
865         spin_lock(&par->accept_q_lock);
866         list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
867         spin_unlock(&par->accept_q_lock);
868         sk_acceptq_added(parent);
869 }
870
871 /* remove a socket from the accept queue of its parental listening socket */
872 static void smc_accept_unlink(struct sock *sk)
873 {
874         struct smc_sock *par = smc_sk(sk)->listen_smc;
875
876         spin_lock(&par->accept_q_lock);
877         list_del_init(&smc_sk(sk)->accept_q);
878         spin_unlock(&par->accept_q_lock);
879         sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
880         sock_put(sk); /* sock_hold in smc_accept_enqueue */
881 }
882
883 /* remove a sock from the accept queue to bind it to a new socket created
884  * for a socket accept call from user space
885  */
886 struct sock *smc_accept_dequeue(struct sock *parent,
887                                 struct socket *new_sock)
888 {
889         struct smc_sock *isk, *n;
890         struct sock *new_sk;
891
892         list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
893                 new_sk = (struct sock *)isk;
894
895                 smc_accept_unlink(new_sk);
896                 if (new_sk->sk_state == SMC_CLOSED) {
897                         if (isk->clcsock) {
898                                 sock_release(isk->clcsock);
899                                 isk->clcsock = NULL;
900                         }
901                         new_sk->sk_prot->unhash(new_sk);
902                         sock_put(new_sk); /* final */
903                         continue;
904                 }
905                 if (new_sock)
906                         sock_graft(new_sk, new_sock);
907                 return new_sk;
908         }
909         return NULL;
910 }
911
912 /* clean up for a created but never accepted sock */
913 void smc_close_non_accepted(struct sock *sk)
914 {
915         struct smc_sock *smc = smc_sk(sk);
916
917         lock_sock(sk);
918         if (!sk->sk_lingertime)
919                 /* wait for peer closing */
920                 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
921         if (!smc->use_fallback) {
922                 smc_close_active(smc);
923                 sock_set_flag(sk, SOCK_DEAD);
924                 sk->sk_shutdown |= SHUTDOWN_MASK;
925         }
926         if (smc->clcsock) {
927                 struct socket *tcp;
928
929                 tcp = smc->clcsock;
930                 smc->clcsock = NULL;
931                 sock_release(tcp);
932         }
933         if (smc->use_fallback) {
934                 sock_put(sk); /* passive closing */
935                 sk->sk_state = SMC_CLOSED;
936         } else {
937                 if (sk->sk_state == SMC_CLOSED)
938                         smc_conn_free(&smc->conn);
939         }
940         release_sock(sk);
941         sk->sk_prot->unhash(sk);
942         sock_put(sk); /* final sock_put */
943 }
944
945 static int smc_serv_conf_first_link(struct smc_sock *smc)
946 {
947         struct net *net = sock_net(smc->clcsock->sk);
948         struct smc_link_group *lgr = smc->conn.lgr;
949         struct smc_link *link;
950         int rest;
951         int rc;
952
953         link = &lgr->lnk[SMC_SINGLE_LINK];
954
955         if (smc_reg_rmb(link, smc->conn.rmb_desc, false))
956                 return SMC_CLC_DECL_ERR_REGRMB;
957
958         /* send CONFIRM LINK request to client over the RoCE fabric */
959         rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
960         if (rc < 0)
961                 return SMC_CLC_DECL_TIMEOUT_CL;
962
963         /* receive CONFIRM LINK response from client over the RoCE fabric */
964         rest = wait_for_completion_interruptible_timeout(
965                 &link->llc_confirm_resp,
966                 SMC_LLC_WAIT_FIRST_TIME);
967         if (rest <= 0) {
968                 struct smc_clc_msg_decline dclc;
969
970                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
971                                       SMC_CLC_DECLINE);
972                 return rc;
973         }
974
975         if (link->llc_confirm_resp_rc)
976                 return SMC_CLC_DECL_RMBE_EC;
977
978         /* send ADD LINK request to client over the RoCE fabric */
979         rc = smc_llc_send_add_link(link,
980                                    link->smcibdev->mac[link->ibport - 1],
981                                    link->gid, SMC_LLC_REQ);
982         if (rc < 0)
983                 return SMC_CLC_DECL_TIMEOUT_AL;
984
985         /* receive ADD LINK response from client over the RoCE fabric */
986         rest = wait_for_completion_interruptible_timeout(&link->llc_add_resp,
987                                                          SMC_LLC_WAIT_TIME);
988         if (rest <= 0) {
989                 struct smc_clc_msg_decline dclc;
990
991                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
992                                       SMC_CLC_DECLINE);
993                 return rc;
994         }
995
996         smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time);
997
998         return 0;
999 }
1000
1001 /* listen worker: finish */
1002 static void smc_listen_out(struct smc_sock *new_smc)
1003 {
1004         struct smc_sock *lsmc = new_smc->listen_smc;
1005         struct sock *newsmcsk = &new_smc->sk;
1006
1007         lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
1008         if (lsmc->sk.sk_state == SMC_LISTEN) {
1009                 smc_accept_enqueue(&lsmc->sk, newsmcsk);
1010         } else { /* no longer listening */
1011                 smc_close_non_accepted(newsmcsk);
1012         }
1013         release_sock(&lsmc->sk);
1014
1015         /* Wake up accept */
1016         lsmc->sk.sk_data_ready(&lsmc->sk);
1017         sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1018 }
1019
1020 /* listen worker: finish in state connected */
1021 static void smc_listen_out_connected(struct smc_sock *new_smc)
1022 {
1023         struct sock *newsmcsk = &new_smc->sk;
1024
1025         sk_refcnt_debug_inc(newsmcsk);
1026         if (newsmcsk->sk_state == SMC_INIT)
1027                 newsmcsk->sk_state = SMC_ACTIVE;
1028
1029         smc_listen_out(new_smc);
1030 }
1031
1032 /* listen worker: finish in error state */
1033 static void smc_listen_out_err(struct smc_sock *new_smc)
1034 {
1035         struct sock *newsmcsk = &new_smc->sk;
1036
1037         if (newsmcsk->sk_state == SMC_INIT)
1038                 sock_put(&new_smc->sk); /* passive closing */
1039         newsmcsk->sk_state = SMC_CLOSED;
1040         smc_conn_free(&new_smc->conn);
1041
1042         smc_listen_out(new_smc);
1043 }
1044
1045 /* listen worker: decline and fall back if possible */
1046 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
1047                                int local_contact)
1048 {
1049         /* RDMA setup failed, switch back to TCP */
1050         if (local_contact == SMC_FIRST_CONTACT)
1051                 smc_lgr_forget(new_smc->conn.lgr);
1052         if (reason_code < 0) { /* error, no fallback possible */
1053                 smc_listen_out_err(new_smc);
1054                 return;
1055         }
1056         smc_conn_free(&new_smc->conn);
1057         new_smc->use_fallback = true;
1058         new_smc->fallback_rsn = reason_code;
1059         if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
1060                 if (smc_clc_send_decline(new_smc, reason_code) < 0) {
1061                         smc_listen_out_err(new_smc);
1062                         return;
1063                 }
1064         }
1065         smc_listen_out_connected(new_smc);
1066 }
1067
1068 /* listen worker: check prefixes */
1069 static int smc_listen_rdma_check(struct smc_sock *new_smc,
1070                                  struct smc_clc_msg_proposal *pclc)
1071 {
1072         struct smc_clc_msg_proposal_prefix *pclc_prfx;
1073         struct socket *newclcsock = new_smc->clcsock;
1074
1075         pclc_prfx = smc_clc_proposal_get_prefix(pclc);
1076         if (smc_clc_prfx_match(newclcsock, pclc_prfx))
1077                 return SMC_CLC_DECL_CNFERR;
1078
1079         return 0;
1080 }
1081
1082 /* listen worker: initialize connection and buffers */
1083 static int smc_listen_rdma_init(struct smc_sock *new_smc,
1084                                 struct smc_clc_msg_proposal *pclc,
1085                                 struct smc_ib_device *ibdev, u8 ibport,
1086                                 int *local_contact)
1087 {
1088         /* allocate connection / link group */
1089         *local_contact = smc_conn_create(new_smc, false, 0, ibdev, ibport, 0,
1090                                          &pclc->lcl, NULL, 0);
1091         if (*local_contact < 0) {
1092                 if (*local_contact == -ENOMEM)
1093                         return SMC_CLC_DECL_MEM;/* insufficient memory*/
1094                 return SMC_CLC_DECL_INTERR; /* other error */
1095         }
1096
1097         /* create send buffer and rmb */
1098         if (smc_buf_create(new_smc, false))
1099                 return SMC_CLC_DECL_MEM;
1100
1101         return 0;
1102 }
1103
1104 /* listen worker: initialize connection and buffers for SMC-D */
1105 static int smc_listen_ism_init(struct smc_sock *new_smc,
1106                                struct smc_clc_msg_proposal *pclc,
1107                                struct smcd_dev *ismdev,
1108                                int *local_contact)
1109 {
1110         struct smc_clc_msg_smcd *pclc_smcd;
1111
1112         pclc_smcd = smc_get_clc_msg_smcd(pclc);
1113         *local_contact = smc_conn_create(new_smc, true, 0, NULL, 0, 0, NULL,
1114                                          ismdev, pclc_smcd->gid);
1115         if (*local_contact < 0) {
1116                 if (*local_contact == -ENOMEM)
1117                         return SMC_CLC_DECL_MEM;/* insufficient memory*/
1118                 return SMC_CLC_DECL_INTERR; /* other error */
1119         }
1120
1121         /* Check if peer can be reached via ISM device */
1122         if (smc_ism_cantalk(new_smc->conn.lgr->peer_gid,
1123                             new_smc->conn.lgr->vlan_id,
1124                             new_smc->conn.lgr->smcd)) {
1125                 if (*local_contact == SMC_FIRST_CONTACT)
1126                         smc_lgr_forget(new_smc->conn.lgr);
1127                 smc_conn_free(&new_smc->conn);
1128                 return SMC_CLC_DECL_CNFERR;
1129         }
1130
1131         /* Create send and receive buffers */
1132         if (smc_buf_create(new_smc, true)) {
1133                 if (*local_contact == SMC_FIRST_CONTACT)
1134                         smc_lgr_forget(new_smc->conn.lgr);
1135                 smc_conn_free(&new_smc->conn);
1136                 return SMC_CLC_DECL_MEM;
1137         }
1138
1139         return 0;
1140 }
1141
1142 /* listen worker: register buffers */
1143 static int smc_listen_rdma_reg(struct smc_sock *new_smc, int local_contact)
1144 {
1145         struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
1146
1147         if (local_contact != SMC_FIRST_CONTACT) {
1148                 if (!new_smc->conn.rmb_desc->reused) {
1149                         if (smc_reg_rmb(link, new_smc->conn.rmb_desc, true))
1150                                 return SMC_CLC_DECL_ERR_REGRMB;
1151                 }
1152         }
1153         smc_rmb_sync_sg_for_device(&new_smc->conn);
1154
1155         return 0;
1156 }
1157
1158 /* listen worker: finish RDMA setup */
1159 static int smc_listen_rdma_finish(struct smc_sock *new_smc,
1160                                   struct smc_clc_msg_accept_confirm *cclc,
1161                                   int local_contact)
1162 {
1163         struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
1164         int reason_code = 0;
1165
1166         if (local_contact == SMC_FIRST_CONTACT)
1167                 smc_link_save_peer_info(link, cclc);
1168
1169         if (smc_rmb_rtoken_handling(&new_smc->conn, cclc)) {
1170                 reason_code = SMC_CLC_DECL_ERR_RTOK;
1171                 goto decline;
1172         }
1173
1174         if (local_contact == SMC_FIRST_CONTACT) {
1175                 if (smc_ib_ready_link(link)) {
1176                         reason_code = SMC_CLC_DECL_ERR_RDYLNK;
1177                         goto decline;
1178                 }
1179                 /* QP confirmation over RoCE fabric */
1180                 reason_code = smc_serv_conf_first_link(new_smc);
1181                 if (reason_code)
1182                         goto decline;
1183         }
1184         return 0;
1185
1186 decline:
1187         mutex_unlock(&smc_create_lgr_pending);
1188         smc_listen_decline(new_smc, reason_code, local_contact);
1189         return reason_code;
1190 }
1191
1192 /* setup for RDMA connection of server */
1193 static void smc_listen_work(struct work_struct *work)
1194 {
1195         struct smc_sock *new_smc = container_of(work, struct smc_sock,
1196                                                 smc_listen_work);
1197         struct socket *newclcsock = new_smc->clcsock;
1198         struct smc_clc_msg_accept_confirm cclc;
1199         struct smc_clc_msg_proposal *pclc;
1200         struct smc_ib_device *ibdev;
1201         bool ism_supported = false;
1202         struct smcd_dev *ismdev;
1203         u8 buf[SMC_CLC_MAX_LEN];
1204         int local_contact = 0;
1205         unsigned short vlan;
1206         int reason_code = 0;
1207         int rc = 0;
1208         u8 ibport;
1209
1210         if (new_smc->use_fallback) {
1211                 smc_listen_out_connected(new_smc);
1212                 return;
1213         }
1214
1215         /* check if peer is smc capable */
1216         if (!tcp_sk(newclcsock->sk)->syn_smc) {
1217                 new_smc->use_fallback = true;
1218                 new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC;
1219                 smc_listen_out_connected(new_smc);
1220                 return;
1221         }
1222
1223         /* do inband token exchange -
1224          * wait for and receive SMC Proposal CLC message
1225          */
1226         pclc = (struct smc_clc_msg_proposal *)&buf;
1227         reason_code = smc_clc_wait_msg(new_smc, pclc, SMC_CLC_MAX_LEN,
1228                                        SMC_CLC_PROPOSAL);
1229         if (reason_code) {
1230                 smc_listen_decline(new_smc, reason_code, 0);
1231                 return;
1232         }
1233
1234         /* IPSec connections opt out of SMC-R optimizations */
1235         if (using_ipsec(new_smc)) {
1236                 smc_listen_decline(new_smc, SMC_CLC_DECL_IPSEC, 0);
1237                 return;
1238         }
1239
1240         mutex_lock(&smc_create_lgr_pending);
1241         smc_close_init(new_smc);
1242         smc_rx_init(new_smc);
1243         smc_tx_init(new_smc);
1244
1245         /* check if ISM is available */
1246         if ((pclc->hdr.path == SMC_TYPE_D || pclc->hdr.path == SMC_TYPE_B) &&
1247             !smc_check_ism(new_smc, &ismdev) &&
1248             !smc_listen_ism_init(new_smc, pclc, ismdev, &local_contact)) {
1249                 ism_supported = true;
1250         }
1251
1252         /* check if RDMA is available */
1253         if (!ism_supported &&
1254             ((pclc->hdr.path != SMC_TYPE_R && pclc->hdr.path != SMC_TYPE_B) ||
1255              smc_vlan_by_tcpsk(new_smc->clcsock, &vlan) ||
1256              smc_check_rdma(new_smc, &ibdev, &ibport, vlan, NULL) ||
1257              smc_listen_rdma_check(new_smc, pclc) ||
1258              smc_listen_rdma_init(new_smc, pclc, ibdev, ibport,
1259                                   &local_contact) ||
1260              smc_listen_rdma_reg(new_smc, local_contact))) {
1261                 /* SMC not supported, decline */
1262                 mutex_unlock(&smc_create_lgr_pending);
1263                 smc_listen_decline(new_smc, SMC_CLC_DECL_MODEUNSUPP,
1264                                    local_contact);
1265                 return;
1266         }
1267
1268         /* send SMC Accept CLC message */
1269         rc = smc_clc_send_accept(new_smc, local_contact);
1270         if (rc) {
1271                 mutex_unlock(&smc_create_lgr_pending);
1272                 smc_listen_decline(new_smc, rc, local_contact);
1273                 return;
1274         }
1275
1276         /* receive SMC Confirm CLC message */
1277         reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
1278                                        SMC_CLC_CONFIRM);
1279         if (reason_code) {
1280                 mutex_unlock(&smc_create_lgr_pending);
1281                 smc_listen_decline(new_smc, reason_code, local_contact);
1282                 return;
1283         }
1284
1285         /* finish worker */
1286         if (!ism_supported) {
1287                 if (smc_listen_rdma_finish(new_smc, &cclc, local_contact))
1288                         return;
1289         }
1290         smc_conn_save_peer_info(new_smc, &cclc);
1291         mutex_unlock(&smc_create_lgr_pending);
1292         smc_listen_out_connected(new_smc);
1293 }
1294
1295 static void smc_tcp_listen_work(struct work_struct *work)
1296 {
1297         struct smc_sock *lsmc = container_of(work, struct smc_sock,
1298                                              tcp_listen_work);
1299         struct sock *lsk = &lsmc->sk;
1300         struct smc_sock *new_smc;
1301         int rc = 0;
1302
1303         lock_sock(lsk);
1304         while (lsk->sk_state == SMC_LISTEN) {
1305                 rc = smc_clcsock_accept(lsmc, &new_smc);
1306                 if (rc)
1307                         goto out;
1308                 if (!new_smc)
1309                         continue;
1310
1311                 new_smc->listen_smc = lsmc;
1312                 new_smc->use_fallback = lsmc->use_fallback;
1313                 new_smc->fallback_rsn = lsmc->fallback_rsn;
1314                 sock_hold(lsk); /* sock_put in smc_listen_work */
1315                 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
1316                 smc_copy_sock_settings_to_smc(new_smc);
1317                 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf;
1318                 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf;
1319                 sock_hold(&new_smc->sk); /* sock_put in passive closing */
1320                 if (!schedule_work(&new_smc->smc_listen_work))
1321                         sock_put(&new_smc->sk);
1322         }
1323
1324 out:
1325         release_sock(lsk);
1326         sock_put(&lsmc->sk); /* sock_hold in smc_listen */
1327 }
1328
1329 static int smc_listen(struct socket *sock, int backlog)
1330 {
1331         struct sock *sk = sock->sk;
1332         struct smc_sock *smc;
1333         int rc;
1334
1335         smc = smc_sk(sk);
1336         lock_sock(sk);
1337
1338         rc = -EINVAL;
1339         if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN))
1340                 goto out;
1341
1342         rc = 0;
1343         if (sk->sk_state == SMC_LISTEN) {
1344                 sk->sk_max_ack_backlog = backlog;
1345                 goto out;
1346         }
1347         /* some socket options are handled in core, so we could not apply
1348          * them to the clc socket -- copy smc socket options to clc socket
1349          */
1350         smc_copy_sock_settings_to_clc(smc);
1351         if (!smc->use_fallback)
1352                 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1353
1354         rc = kernel_listen(smc->clcsock, backlog);
1355         if (rc)
1356                 goto out;
1357         sk->sk_max_ack_backlog = backlog;
1358         sk->sk_ack_backlog = 0;
1359         sk->sk_state = SMC_LISTEN;
1360         INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
1361         sock_hold(sk); /* sock_hold in tcp_listen_worker */
1362         if (!schedule_work(&smc->tcp_listen_work))
1363                 sock_put(sk);
1364
1365 out:
1366         release_sock(sk);
1367         return rc;
1368 }
1369
1370 static int smc_accept(struct socket *sock, struct socket *new_sock,
1371                       int flags, bool kern)
1372 {
1373         struct sock *sk = sock->sk, *nsk;
1374         DECLARE_WAITQUEUE(wait, current);
1375         struct smc_sock *lsmc;
1376         long timeo;
1377         int rc = 0;
1378
1379         lsmc = smc_sk(sk);
1380         sock_hold(sk); /* sock_put below */
1381         lock_sock(sk);
1382
1383         if (lsmc->sk.sk_state != SMC_LISTEN) {
1384                 rc = -EINVAL;
1385                 release_sock(sk);
1386                 goto out;
1387         }
1388
1389         /* Wait for an incoming connection */
1390         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1391         add_wait_queue_exclusive(sk_sleep(sk), &wait);
1392         while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
1393                 set_current_state(TASK_INTERRUPTIBLE);
1394                 if (!timeo) {
1395                         rc = -EAGAIN;
1396                         break;
1397                 }
1398                 release_sock(sk);
1399                 timeo = schedule_timeout(timeo);
1400                 /* wakeup by sk_data_ready in smc_listen_work() */
1401                 sched_annotate_sleep();
1402                 lock_sock(sk);
1403                 if (signal_pending(current)) {
1404                         rc = sock_intr_errno(timeo);
1405                         break;
1406                 }
1407         }
1408         set_current_state(TASK_RUNNING);
1409         remove_wait_queue(sk_sleep(sk), &wait);
1410
1411         if (!rc)
1412                 rc = sock_error(nsk);
1413         release_sock(sk);
1414         if (rc)
1415                 goto out;
1416
1417         if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
1418                 /* wait till data arrives on the socket */
1419                 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
1420                                                                 MSEC_PER_SEC);
1421                 if (smc_sk(nsk)->use_fallback) {
1422                         struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
1423
1424                         lock_sock(clcsk);
1425                         if (skb_queue_empty(&clcsk->sk_receive_queue))
1426                                 sk_wait_data(clcsk, &timeo, NULL);
1427                         release_sock(clcsk);
1428                 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
1429                         lock_sock(nsk);
1430                         smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
1431                         release_sock(nsk);
1432                 }
1433         }
1434
1435 out:
1436         sock_put(sk); /* sock_hold above */
1437         return rc;
1438 }
1439
1440 static int smc_getname(struct socket *sock, struct sockaddr *addr,
1441                        int peer)
1442 {
1443         struct smc_sock *smc;
1444
1445         if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
1446             (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
1447                 return -ENOTCONN;
1448
1449         smc = smc_sk(sock->sk);
1450
1451         return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
1452 }
1453
1454 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1455 {
1456         struct sock *sk = sock->sk;
1457         struct smc_sock *smc;
1458         int rc = -EPIPE;
1459
1460         smc = smc_sk(sk);
1461         lock_sock(sk);
1462         if ((sk->sk_state != SMC_ACTIVE) &&
1463             (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1464             (sk->sk_state != SMC_INIT))
1465                 goto out;
1466
1467         if (msg->msg_flags & MSG_FASTOPEN) {
1468                 if (sk->sk_state == SMC_INIT) {
1469                         smc->use_fallback = true;
1470                         smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
1471                 } else {
1472                         rc = -EINVAL;
1473                         goto out;
1474                 }
1475         }
1476
1477         if (smc->use_fallback)
1478                 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
1479         else
1480                 rc = smc_tx_sendmsg(smc, msg, len);
1481 out:
1482         release_sock(sk);
1483         return rc;
1484 }
1485
1486 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1487                        int flags)
1488 {
1489         struct sock *sk = sock->sk;
1490         struct smc_sock *smc;
1491         int rc = -ENOTCONN;
1492
1493         smc = smc_sk(sk);
1494         lock_sock(sk);
1495         if ((sk->sk_state == SMC_INIT) ||
1496             (sk->sk_state == SMC_LISTEN) ||
1497             (sk->sk_state == SMC_CLOSED))
1498                 goto out;
1499
1500         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1501                 rc = 0;
1502                 goto out;
1503         }
1504
1505         if (smc->use_fallback) {
1506                 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
1507         } else {
1508                 msg->msg_namelen = 0;
1509                 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
1510         }
1511
1512 out:
1513         release_sock(sk);
1514         return rc;
1515 }
1516
1517 static __poll_t smc_accept_poll(struct sock *parent)
1518 {
1519         struct smc_sock *isk = smc_sk(parent);
1520         __poll_t mask = 0;
1521
1522         spin_lock(&isk->accept_q_lock);
1523         if (!list_empty(&isk->accept_q))
1524                 mask = EPOLLIN | EPOLLRDNORM;
1525         spin_unlock(&isk->accept_q_lock);
1526
1527         return mask;
1528 }
1529
1530 static __poll_t smc_poll(struct file *file, struct socket *sock,
1531                              poll_table *wait)
1532 {
1533         struct sock *sk = sock->sk;
1534         __poll_t mask = 0;
1535         struct smc_sock *smc;
1536
1537         if (!sk)
1538                 return EPOLLNVAL;
1539
1540         smc = smc_sk(sock->sk);
1541         if (smc->use_fallback) {
1542                 /* delegate to CLC child sock */
1543                 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
1544                 sk->sk_err = smc->clcsock->sk->sk_err;
1545                 if (sk->sk_err)
1546                         mask |= EPOLLERR;
1547         } else {
1548                 if (sk->sk_state != SMC_CLOSED)
1549                         sock_poll_wait(file, sock, wait);
1550                 if (sk->sk_err)
1551                         mask |= EPOLLERR;
1552                 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
1553                     (sk->sk_state == SMC_CLOSED))
1554                         mask |= EPOLLHUP;
1555                 if (sk->sk_state == SMC_LISTEN) {
1556                         /* woken up by sk_data_ready in smc_listen_work() */
1557                         mask = smc_accept_poll(sk);
1558                 } else {
1559                         if (atomic_read(&smc->conn.sndbuf_space) ||
1560                             sk->sk_shutdown & SEND_SHUTDOWN) {
1561                                 mask |= EPOLLOUT | EPOLLWRNORM;
1562                         } else {
1563                                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1564                                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1565                         }
1566                         if (atomic_read(&smc->conn.bytes_to_rcv))
1567                                 mask |= EPOLLIN | EPOLLRDNORM;
1568                         if (sk->sk_shutdown & RCV_SHUTDOWN)
1569                                 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
1570                         if (sk->sk_state == SMC_APPCLOSEWAIT1)
1571                                 mask |= EPOLLIN;
1572                         if (smc->conn.urg_state == SMC_URG_VALID)
1573                                 mask |= EPOLLPRI;
1574                 }
1575         }
1576
1577         return mask;
1578 }
1579
1580 static int smc_shutdown(struct socket *sock, int how)
1581 {
1582         struct sock *sk = sock->sk;
1583         struct smc_sock *smc;
1584         int rc = -EINVAL;
1585         int rc1 = 0;
1586
1587         smc = smc_sk(sk);
1588
1589         if ((how < SHUT_RD) || (how > SHUT_RDWR))
1590                 return rc;
1591
1592         lock_sock(sk);
1593
1594         rc = -ENOTCONN;
1595         if ((sk->sk_state != SMC_ACTIVE) &&
1596             (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
1597             (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
1598             (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1599             (sk->sk_state != SMC_APPCLOSEWAIT2) &&
1600             (sk->sk_state != SMC_APPFINCLOSEWAIT))
1601                 goto out;
1602         if (smc->use_fallback) {
1603                 rc = kernel_sock_shutdown(smc->clcsock, how);
1604                 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
1605                 if (sk->sk_shutdown == SHUTDOWN_MASK)
1606                         sk->sk_state = SMC_CLOSED;
1607                 goto out;
1608         }
1609         switch (how) {
1610         case SHUT_RDWR:         /* shutdown in both directions */
1611                 rc = smc_close_active(smc);
1612                 break;
1613         case SHUT_WR:
1614                 rc = smc_close_shutdown_write(smc);
1615                 break;
1616         case SHUT_RD:
1617                 rc = 0;
1618                 /* nothing more to do because peer is not involved */
1619                 break;
1620         }
1621         if (smc->clcsock)
1622                 rc1 = kernel_sock_shutdown(smc->clcsock, how);
1623         /* map sock_shutdown_cmd constants to sk_shutdown value range */
1624         sk->sk_shutdown |= how + 1;
1625
1626 out:
1627         release_sock(sk);
1628         return rc ? rc : rc1;
1629 }
1630
1631 static int smc_setsockopt(struct socket *sock, int level, int optname,
1632                           char __user *optval, unsigned int optlen)
1633 {
1634         struct sock *sk = sock->sk;
1635         struct smc_sock *smc;
1636         int val, rc;
1637
1638         smc = smc_sk(sk);
1639
1640         /* generic setsockopts reaching us here always apply to the
1641          * CLC socket
1642          */
1643         rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
1644                                            optval, optlen);
1645         if (smc->clcsock->sk->sk_err) {
1646                 sk->sk_err = smc->clcsock->sk->sk_err;
1647                 sk->sk_error_report(sk);
1648         }
1649         if (rc)
1650                 return rc;
1651
1652         if (optlen < sizeof(int))
1653                 return -EINVAL;
1654         if (get_user(val, (int __user *)optval))
1655                 return -EFAULT;
1656
1657         lock_sock(sk);
1658         switch (optname) {
1659         case TCP_ULP:
1660         case TCP_FASTOPEN:
1661         case TCP_FASTOPEN_CONNECT:
1662         case TCP_FASTOPEN_KEY:
1663         case TCP_FASTOPEN_NO_COOKIE:
1664                 /* option not supported by SMC */
1665                 if (sk->sk_state == SMC_INIT) {
1666                         smc->use_fallback = true;
1667                         smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
1668                 } else {
1669                         if (!smc->use_fallback)
1670                                 rc = -EINVAL;
1671                 }
1672                 break;
1673         case TCP_NODELAY:
1674                 if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) {
1675                         if (val && !smc->use_fallback)
1676                                 mod_delayed_work(system_wq, &smc->conn.tx_work,
1677                                                  0);
1678                 }
1679                 break;
1680         case TCP_CORK:
1681                 if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) {
1682                         if (!val && !smc->use_fallback)
1683                                 mod_delayed_work(system_wq, &smc->conn.tx_work,
1684                                                  0);
1685                 }
1686                 break;
1687         case TCP_DEFER_ACCEPT:
1688                 smc->sockopt_defer_accept = val;
1689                 break;
1690         default:
1691                 break;
1692         }
1693         release_sock(sk);
1694
1695         return rc;
1696 }
1697
1698 static int smc_getsockopt(struct socket *sock, int level, int optname,
1699                           char __user *optval, int __user *optlen)
1700 {
1701         struct smc_sock *smc;
1702
1703         smc = smc_sk(sock->sk);
1704         /* socket options apply to the CLC socket */
1705         return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
1706                                              optval, optlen);
1707 }
1708
1709 static int smc_ioctl(struct socket *sock, unsigned int cmd,
1710                      unsigned long arg)
1711 {
1712         union smc_host_cursor cons, urg;
1713         struct smc_connection *conn;
1714         struct smc_sock *smc;
1715         int answ;
1716
1717         smc = smc_sk(sock->sk);
1718         conn = &smc->conn;
1719         lock_sock(&smc->sk);
1720         if (smc->use_fallback) {
1721                 if (!smc->clcsock) {
1722                         release_sock(&smc->sk);
1723                         return -EBADF;
1724                 }
1725                 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
1726                 release_sock(&smc->sk);
1727                 return answ;
1728         }
1729         switch (cmd) {
1730         case SIOCINQ: /* same as FIONREAD */
1731                 if (smc->sk.sk_state == SMC_LISTEN) {
1732                         release_sock(&smc->sk);
1733                         return -EINVAL;
1734                 }
1735                 if (smc->sk.sk_state == SMC_INIT ||
1736                     smc->sk.sk_state == SMC_CLOSED)
1737                         answ = 0;
1738                 else
1739                         answ = atomic_read(&smc->conn.bytes_to_rcv);
1740                 break;
1741         case SIOCOUTQ:
1742                 /* output queue size (not send + not acked) */
1743                 if (smc->sk.sk_state == SMC_LISTEN) {
1744                         release_sock(&smc->sk);
1745                         return -EINVAL;
1746                 }
1747                 if (smc->sk.sk_state == SMC_INIT ||
1748                     smc->sk.sk_state == SMC_CLOSED)
1749                         answ = 0;
1750                 else
1751                         answ = smc->conn.sndbuf_desc->len -
1752                                         atomic_read(&smc->conn.sndbuf_space);
1753                 break;
1754         case SIOCOUTQNSD:
1755                 /* output queue size (not send only) */
1756                 if (smc->sk.sk_state == SMC_LISTEN) {
1757                         release_sock(&smc->sk);
1758                         return -EINVAL;
1759                 }
1760                 if (smc->sk.sk_state == SMC_INIT ||
1761                     smc->sk.sk_state == SMC_CLOSED)
1762                         answ = 0;
1763                 else
1764                         answ = smc_tx_prepared_sends(&smc->conn);
1765                 break;
1766         case SIOCATMARK:
1767                 if (smc->sk.sk_state == SMC_LISTEN) {
1768                         release_sock(&smc->sk);
1769                         return -EINVAL;
1770                 }
1771                 if (smc->sk.sk_state == SMC_INIT ||
1772                     smc->sk.sk_state == SMC_CLOSED) {
1773                         answ = 0;
1774                 } else {
1775                         smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
1776                         smc_curs_copy(&urg, &conn->urg_curs, conn);
1777                         answ = smc_curs_diff(conn->rmb_desc->len,
1778                                              &cons, &urg) == 1;
1779                 }
1780                 break;
1781         default:
1782                 release_sock(&smc->sk);
1783                 return -ENOIOCTLCMD;
1784         }
1785         release_sock(&smc->sk);
1786
1787         return put_user(answ, (int __user *)arg);
1788 }
1789
1790 static ssize_t smc_sendpage(struct socket *sock, struct page *page,
1791                             int offset, size_t size, int flags)
1792 {
1793         struct sock *sk = sock->sk;
1794         struct smc_sock *smc;
1795         int rc = -EPIPE;
1796
1797         smc = smc_sk(sk);
1798         lock_sock(sk);
1799         if (sk->sk_state != SMC_ACTIVE) {
1800                 release_sock(sk);
1801                 goto out;
1802         }
1803         release_sock(sk);
1804         if (smc->use_fallback)
1805                 rc = kernel_sendpage(smc->clcsock, page, offset,
1806                                      size, flags);
1807         else
1808                 rc = sock_no_sendpage(sock, page, offset, size, flags);
1809
1810 out:
1811         return rc;
1812 }
1813
1814 /* Map the affected portions of the rmbe into an spd, note the number of bytes
1815  * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
1816  * updates till whenever a respective page has been fully processed.
1817  * Note that subsequent recv() calls have to wait till all splice() processing
1818  * completed.
1819  */
1820 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
1821                                struct pipe_inode_info *pipe, size_t len,
1822                                unsigned int flags)
1823 {
1824         struct sock *sk = sock->sk;
1825         struct smc_sock *smc;
1826         int rc = -ENOTCONN;
1827
1828         smc = smc_sk(sk);
1829         lock_sock(sk);
1830
1831         if (sk->sk_state == SMC_INIT ||
1832             sk->sk_state == SMC_LISTEN ||
1833             sk->sk_state == SMC_CLOSED)
1834                 goto out;
1835
1836         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1837                 rc = 0;
1838                 goto out;
1839         }
1840
1841         if (smc->use_fallback) {
1842                 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
1843                                                     pipe, len, flags);
1844         } else {
1845                 if (*ppos) {
1846                         rc = -ESPIPE;
1847                         goto out;
1848                 }
1849                 if (flags & SPLICE_F_NONBLOCK)
1850                         flags = MSG_DONTWAIT;
1851                 else
1852                         flags = 0;
1853                 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
1854         }
1855 out:
1856         release_sock(sk);
1857
1858         return rc;
1859 }
1860
1861 /* must look like tcp */
1862 static const struct proto_ops smc_sock_ops = {
1863         .family         = PF_SMC,
1864         .owner          = THIS_MODULE,
1865         .release        = smc_release,
1866         .bind           = smc_bind,
1867         .connect        = smc_connect,
1868         .socketpair     = sock_no_socketpair,
1869         .accept         = smc_accept,
1870         .getname        = smc_getname,
1871         .poll           = smc_poll,
1872         .ioctl          = smc_ioctl,
1873         .listen         = smc_listen,
1874         .shutdown       = smc_shutdown,
1875         .setsockopt     = smc_setsockopt,
1876         .getsockopt     = smc_getsockopt,
1877         .sendmsg        = smc_sendmsg,
1878         .recvmsg        = smc_recvmsg,
1879         .mmap           = sock_no_mmap,
1880         .sendpage       = smc_sendpage,
1881         .splice_read    = smc_splice_read,
1882 };
1883
1884 static int smc_create(struct net *net, struct socket *sock, int protocol,
1885                       int kern)
1886 {
1887         int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
1888         struct smc_sock *smc;
1889         struct sock *sk;
1890         int rc;
1891
1892         rc = -ESOCKTNOSUPPORT;
1893         if (sock->type != SOCK_STREAM)
1894                 goto out;
1895
1896         rc = -EPROTONOSUPPORT;
1897         if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
1898                 goto out;
1899
1900         rc = -ENOBUFS;
1901         sock->ops = &smc_sock_ops;
1902         sk = smc_sock_alloc(net, sock, protocol);
1903         if (!sk)
1904                 goto out;
1905
1906         /* create internal TCP socket for CLC handshake and fallback */
1907         smc = smc_sk(sk);
1908         smc->use_fallback = false; /* assume rdma capability first */
1909         smc->fallback_rsn = 0;
1910         rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
1911                               &smc->clcsock);
1912         if (rc) {
1913                 sk_common_release(sk);
1914                 goto out;
1915         }
1916         smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
1917         smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
1918
1919 out:
1920         return rc;
1921 }
1922
1923 static const struct net_proto_family smc_sock_family_ops = {
1924         .family = PF_SMC,
1925         .owner  = THIS_MODULE,
1926         .create = smc_create,
1927 };
1928
1929 static int __init smc_init(void)
1930 {
1931         int rc;
1932
1933         rc = smc_pnet_init();
1934         if (rc)
1935                 return rc;
1936
1937         rc = smc_llc_init();
1938         if (rc) {
1939                 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
1940                 goto out_pnet;
1941         }
1942
1943         rc = smc_cdc_init();
1944         if (rc) {
1945                 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
1946                 goto out_pnet;
1947         }
1948
1949         rc = proto_register(&smc_proto, 1);
1950         if (rc) {
1951                 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
1952                 goto out_pnet;
1953         }
1954
1955         rc = proto_register(&smc_proto6, 1);
1956         if (rc) {
1957                 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
1958                 goto out_proto;
1959         }
1960
1961         rc = sock_register(&smc_sock_family_ops);
1962         if (rc) {
1963                 pr_err("%s: sock_register fails with %d\n", __func__, rc);
1964                 goto out_proto6;
1965         }
1966         INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
1967         INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
1968
1969         rc = smc_ib_register_client();
1970         if (rc) {
1971                 pr_err("%s: ib_register fails with %d\n", __func__, rc);
1972                 goto out_sock;
1973         }
1974
1975         static_branch_enable(&tcp_have_smc);
1976         return 0;
1977
1978 out_sock:
1979         sock_unregister(PF_SMC);
1980 out_proto6:
1981         proto_unregister(&smc_proto6);
1982 out_proto:
1983         proto_unregister(&smc_proto);
1984 out_pnet:
1985         smc_pnet_exit();
1986         return rc;
1987 }
1988
1989 static void __exit smc_exit(void)
1990 {
1991         smc_core_exit();
1992         static_branch_disable(&tcp_have_smc);
1993         smc_ib_unregister_client();
1994         sock_unregister(PF_SMC);
1995         proto_unregister(&smc_proto6);
1996         proto_unregister(&smc_proto);
1997         smc_pnet_exit();
1998 }
1999
2000 module_init(smc_init);
2001 module_exit(smc_exit);
2002
2003 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
2004 MODULE_DESCRIPTION("smc socket address family");
2005 MODULE_LICENSE("GPL");
2006 MODULE_ALIAS_NETPROTO(PF_SMC);