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Linux/net/smc/af_smc.c

Version: ~ [ linux-5.10-rc5 ] ~ [ linux-5.9.10 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.79 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.159 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.208 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.245 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.245 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  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  *    - non-blocking connect postponed
 11  *    - IPv6 support postponed
 12  *    - support for alternate links postponed
 13  *    - partial support for non-blocking sockets only
 14  *    - support for urgent data postponed
 15  *
 16  *  Copyright IBM Corp. 2016
 17  *
 18  *  Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
 19  *              based on prototype from Frank Blaschka
 20  */
 21 
 22 #define KMSG_COMPONENT "smc"
 23 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 24 
 25 #include <linux/module.h>
 26 #include <linux/socket.h>
 27 #include <linux/inetdevice.h>
 28 #include <linux/workqueue.h>
 29 #include <linux/in.h>
 30 #include <linux/sched/signal.h>
 31 
 32 #include <net/sock.h>
 33 #include <net/tcp.h>
 34 #include <net/smc.h>
 35 
 36 #include "smc.h"
 37 #include "smc_clc.h"
 38 #include "smc_llc.h"
 39 #include "smc_cdc.h"
 40 #include "smc_core.h"
 41 #include "smc_ib.h"
 42 #include "smc_pnet.h"
 43 #include "smc_tx.h"
 44 #include "smc_rx.h"
 45 #include "smc_close.h"
 46 
 47 static DEFINE_MUTEX(smc_create_lgr_pending);    /* serialize link group
 48                                                  * creation
 49                                                  */
 50 
 51 struct smc_lgr_list smc_lgr_list = {            /* established link groups */
 52         .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
 53         .list = LIST_HEAD_INIT(smc_lgr_list.list),
 54 };
 55 
 56 static void smc_tcp_listen_work(struct work_struct *);
 57 
 58 static void smc_set_keepalive(struct sock *sk, int val)
 59 {
 60         struct smc_sock *smc = smc_sk(sk);
 61 
 62         smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
 63 }
 64 
 65 static struct smc_hashinfo smc_v4_hashinfo = {
 66         .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
 67 };
 68 
 69 int smc_hash_sk(struct sock *sk)
 70 {
 71         struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
 72         struct hlist_head *head;
 73 
 74         head = &h->ht;
 75 
 76         write_lock_bh(&h->lock);
 77         sk_add_node(sk, head);
 78         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 79         write_unlock_bh(&h->lock);
 80 
 81         return 0;
 82 }
 83 EXPORT_SYMBOL_GPL(smc_hash_sk);
 84 
 85 void smc_unhash_sk(struct sock *sk)
 86 {
 87         struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
 88 
 89         write_lock_bh(&h->lock);
 90         if (sk_del_node_init(sk))
 91                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 92         write_unlock_bh(&h->lock);
 93 }
 94 EXPORT_SYMBOL_GPL(smc_unhash_sk);
 95 
 96 struct proto smc_proto = {
 97         .name           = "SMC",
 98         .owner          = THIS_MODULE,
 99         .keepalive      = smc_set_keepalive,
100         .hash           = smc_hash_sk,
101         .unhash         = smc_unhash_sk,
102         .obj_size       = sizeof(struct smc_sock),
103         .h.smc_hash     = &smc_v4_hashinfo,
104         .slab_flags     = SLAB_TYPESAFE_BY_RCU,
105 };
106 EXPORT_SYMBOL_GPL(smc_proto);
107 
108 static int smc_release(struct socket *sock)
109 {
110         struct sock *sk = sock->sk;
111         struct smc_sock *smc;
112         int rc = 0;
113 
114         if (!sk)
115                 goto out;
116 
117         smc = smc_sk(sk);
118         sock_hold(sk);
119         if (sk->sk_state == SMC_LISTEN)
120                 /* smc_close_non_accepted() is called and acquires
121                  * sock lock for child sockets again
122                  */
123                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
124         else
125                 lock_sock(sk);
126 
127         if (smc->use_fallback) {
128                 sk->sk_state = SMC_CLOSED;
129                 sk->sk_state_change(sk);
130         } else {
131                 rc = smc_close_active(smc);
132                 sock_set_flag(sk, SOCK_DEAD);
133                 sk->sk_shutdown |= SHUTDOWN_MASK;
134         }
135         if (smc->clcsock) {
136                 sock_release(smc->clcsock);
137                 smc->clcsock = NULL;
138         }
139 
140         /* detach socket */
141         sock_orphan(sk);
142         sock->sk = NULL;
143         if (smc->use_fallback) {
144                 schedule_delayed_work(&smc->sock_put_work, TCP_TIMEWAIT_LEN);
145         } else if (sk->sk_state == SMC_CLOSED) {
146                 smc_conn_free(&smc->conn);
147                 schedule_delayed_work(&smc->sock_put_work,
148                                       SMC_CLOSE_SOCK_PUT_DELAY);
149         }
150         release_sock(sk);
151 
152         sock_put(sk);
153 out:
154         return rc;
155 }
156 
157 static void smc_destruct(struct sock *sk)
158 {
159         if (sk->sk_state != SMC_CLOSED)
160                 return;
161         if (!sock_flag(sk, SOCK_DEAD))
162                 return;
163 
164         sk_refcnt_debug_dec(sk);
165 }
166 
167 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock)
168 {
169         struct smc_sock *smc;
170         struct sock *sk;
171 
172         sk = sk_alloc(net, PF_SMC, GFP_KERNEL, &smc_proto, 0);
173         if (!sk)
174                 return NULL;
175 
176         sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
177         sk->sk_state = SMC_INIT;
178         sk->sk_destruct = smc_destruct;
179         sk->sk_protocol = SMCPROTO_SMC;
180         smc = smc_sk(sk);
181         INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
182         INIT_LIST_HEAD(&smc->accept_q);
183         spin_lock_init(&smc->accept_q_lock);
184         INIT_DELAYED_WORK(&smc->sock_put_work, smc_close_sock_put_work);
185         sk->sk_prot->hash(sk);
186         sk_refcnt_debug_inc(sk);
187 
188         return sk;
189 }
190 
191 static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
192                     int addr_len)
193 {
194         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
195         struct sock *sk = sock->sk;
196         struct smc_sock *smc;
197         int rc;
198 
199         smc = smc_sk(sk);
200 
201         /* replicate tests from inet_bind(), to be safe wrt. future changes */
202         rc = -EINVAL;
203         if (addr_len < sizeof(struct sockaddr_in))
204                 goto out;
205 
206         rc = -EAFNOSUPPORT;
207         /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
208         if ((addr->sin_family != AF_INET) &&
209             ((addr->sin_family != AF_UNSPEC) ||
210              (addr->sin_addr.s_addr != htonl(INADDR_ANY))))
211                 goto out;
212 
213         lock_sock(sk);
214 
215         /* Check if socket is already active */
216         rc = -EINVAL;
217         if (sk->sk_state != SMC_INIT)
218                 goto out_rel;
219 
220         smc->clcsock->sk->sk_reuse = sk->sk_reuse;
221         rc = kernel_bind(smc->clcsock, uaddr, addr_len);
222 
223 out_rel:
224         release_sock(sk);
225 out:
226         return rc;
227 }
228 
229 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
230                                    unsigned long mask)
231 {
232         /* options we don't get control via setsockopt for */
233         nsk->sk_type = osk->sk_type;
234         nsk->sk_sndbuf = osk->sk_sndbuf;
235         nsk->sk_rcvbuf = osk->sk_rcvbuf;
236         nsk->sk_sndtimeo = osk->sk_sndtimeo;
237         nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
238         nsk->sk_mark = osk->sk_mark;
239         nsk->sk_priority = osk->sk_priority;
240         nsk->sk_rcvlowat = osk->sk_rcvlowat;
241         nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
242         nsk->sk_err = osk->sk_err;
243 
244         nsk->sk_flags &= ~mask;
245         nsk->sk_flags |= osk->sk_flags & mask;
246 }
247 
248 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
249                              (1UL << SOCK_KEEPOPEN) | \
250                              (1UL << SOCK_LINGER) | \
251                              (1UL << SOCK_BROADCAST) | \
252                              (1UL << SOCK_TIMESTAMP) | \
253                              (1UL << SOCK_DBG) | \
254                              (1UL << SOCK_RCVTSTAMP) | \
255                              (1UL << SOCK_RCVTSTAMPNS) | \
256                              (1UL << SOCK_LOCALROUTE) | \
257                              (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
258                              (1UL << SOCK_RXQ_OVFL) | \
259                              (1UL << SOCK_WIFI_STATUS) | \
260                              (1UL << SOCK_NOFCS) | \
261                              (1UL << SOCK_FILTER_LOCKED))
262 /* copy only relevant settings and flags of SOL_SOCKET level from smc to
263  * clc socket (since smc is not called for these options from net/core)
264  */
265 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
266 {
267         smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
268 }
269 
270 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
271                              (1UL << SOCK_KEEPOPEN) | \
272                              (1UL << SOCK_LINGER) | \
273                              (1UL << SOCK_DBG))
274 /* copy only settings and flags relevant for smc from clc to smc socket */
275 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
276 {
277         smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
278 }
279 
280 /* determine subnet and mask of internal TCP socket */
281 int smc_netinfo_by_tcpsk(struct socket *clcsock,
282                          __be32 *subnet, u8 *prefix_len)
283 {
284         struct dst_entry *dst = sk_dst_get(clcsock->sk);
285         struct sockaddr_in addr;
286         int rc = -ENOENT;
287         int len;
288 
289         if (!dst) {
290                 rc = -ENOTCONN;
291                 goto out;
292         }
293         if (!dst->dev) {
294                 rc = -ENODEV;
295                 goto out_rel;
296         }
297 
298         /* get address to which the internal TCP socket is bound */
299         kernel_getsockname(clcsock, (struct sockaddr *)&addr, &len);
300         /* analyze IPv4 specific data of net_device belonging to TCP socket */
301         for_ifa(dst->dev->ip_ptr) {
302                 if (ifa->ifa_address != addr.sin_addr.s_addr)
303                         continue;
304                 *prefix_len = inet_mask_len(ifa->ifa_mask);
305                 *subnet = ifa->ifa_address & ifa->ifa_mask;
306                 rc = 0;
307                 break;
308         } endfor_ifa(dst->dev->ip_ptr);
309 
310 out_rel:
311         dst_release(dst);
312 out:
313         return rc;
314 }
315 
316 static int smc_clnt_conf_first_link(struct smc_sock *smc, union ib_gid *gid)
317 {
318         struct smc_link_group *lgr = smc->conn.lgr;
319         struct smc_link *link;
320         int rest;
321         int rc;
322 
323         link = &lgr->lnk[SMC_SINGLE_LINK];
324         /* receive CONFIRM LINK request from server over RoCE fabric */
325         rest = wait_for_completion_interruptible_timeout(
326                 &link->llc_confirm,
327                 SMC_LLC_WAIT_FIRST_TIME);
328         if (rest <= 0) {
329                 struct smc_clc_msg_decline dclc;
330 
331                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
332                                       SMC_CLC_DECLINE);
333                 return rc;
334         }
335 
336         rc = smc_ib_modify_qp_rts(link);
337         if (rc)
338                 return SMC_CLC_DECL_INTERR;
339 
340         smc_wr_remember_qp_attr(link);
341         /* send CONFIRM LINK response over RoCE fabric */
342         rc = smc_llc_send_confirm_link(link,
343                                        link->smcibdev->mac[link->ibport - 1],
344                                        gid, SMC_LLC_RESP);
345         if (rc < 0)
346                 return SMC_CLC_DECL_TCL;
347 
348         return rc;
349 }
350 
351 static void smc_conn_save_peer_info(struct smc_sock *smc,
352                                     struct smc_clc_msg_accept_confirm *clc)
353 {
354         smc->conn.peer_conn_idx = clc->conn_idx;
355         smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token);
356         smc->conn.peer_rmbe_size = smc_uncompress_bufsize(clc->rmbe_size);
357         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
358 }
359 
360 static void smc_link_save_peer_info(struct smc_link *link,
361                                     struct smc_clc_msg_accept_confirm *clc)
362 {
363         link->peer_qpn = ntoh24(clc->qpn);
364         memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE);
365         memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac));
366         link->peer_psn = ntoh24(clc->psn);
367         link->peer_mtu = clc->qp_mtu;
368 }
369 
370 /* setup for RDMA connection of client */
371 static int smc_connect_rdma(struct smc_sock *smc)
372 {
373         struct sockaddr_in *inaddr = (struct sockaddr_in *)smc->addr;
374         struct smc_clc_msg_accept_confirm aclc;
375         int local_contact = SMC_FIRST_CONTACT;
376         struct smc_ib_device *smcibdev;
377         struct smc_link *link;
378         u8 srv_first_contact;
379         int reason_code = 0;
380         int rc = 0;
381         u8 ibport;
382 
383         /* IPSec connections opt out of SMC-R optimizations */
384         if (using_ipsec(smc)) {
385                 reason_code = SMC_CLC_DECL_IPSEC;
386                 goto decline_rdma;
387         }
388 
389         /* PNET table look up: search active ib_device and port
390          * within same PNETID that also contains the ethernet device
391          * used for the internal TCP socket
392          */
393         smc_pnet_find_roce_resource(smc->clcsock->sk, &smcibdev, &ibport);
394         if (!smcibdev) {
395                 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
396                 goto decline_rdma;
397         }
398 
399         /* do inband token exchange */
400         reason_code = smc_clc_send_proposal(smc, smcibdev, ibport);
401         if (reason_code < 0) {
402                 rc = reason_code;
403                 goto out_err;
404         }
405         if (reason_code > 0) /* configuration error */
406                 goto decline_rdma;
407         /* receive SMC Accept CLC message */
408         reason_code = smc_clc_wait_msg(smc, &aclc, sizeof(aclc),
409                                        SMC_CLC_ACCEPT);
410         if (reason_code < 0) {
411                 rc = reason_code;
412                 goto out_err;
413         }
414         if (reason_code > 0)
415                 goto decline_rdma;
416 
417         srv_first_contact = aclc.hdr.flag;
418         mutex_lock(&smc_create_lgr_pending);
419         local_contact = smc_conn_create(smc, inaddr->sin_addr.s_addr, smcibdev,
420                                         ibport, &aclc.lcl, srv_first_contact);
421         if (local_contact < 0) {
422                 rc = local_contact;
423                 if (rc == -ENOMEM)
424                         reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
425                 else if (rc == -ENOLINK)
426                         reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */
427                 goto decline_rdma_unlock;
428         }
429         link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK];
430 
431         smc_conn_save_peer_info(smc, &aclc);
432 
433         rc = smc_sndbuf_create(smc);
434         if (rc) {
435                 reason_code = SMC_CLC_DECL_MEM;
436                 goto decline_rdma_unlock;
437         }
438         rc = smc_rmb_create(smc);
439         if (rc) {
440                 reason_code = SMC_CLC_DECL_MEM;
441                 goto decline_rdma_unlock;
442         }
443 
444         if (local_contact == SMC_FIRST_CONTACT)
445                 smc_link_save_peer_info(link, &aclc);
446 
447         rc = smc_rmb_rtoken_handling(&smc->conn, &aclc);
448         if (rc) {
449                 reason_code = SMC_CLC_DECL_INTERR;
450                 goto decline_rdma_unlock;
451         }
452 
453         smc_close_init(smc);
454         smc_rx_init(smc);
455 
456         if (local_contact == SMC_FIRST_CONTACT) {
457                 rc = smc_ib_ready_link(link);
458                 if (rc) {
459                         reason_code = SMC_CLC_DECL_INTERR;
460                         goto decline_rdma_unlock;
461                 }
462         }
463 
464         rc = smc_clc_send_confirm(smc);
465         if (rc)
466                 goto out_err_unlock;
467 
468         if (local_contact == SMC_FIRST_CONTACT) {
469                 /* QP confirmation over RoCE fabric */
470                 reason_code = smc_clnt_conf_first_link(
471                         smc, &smcibdev->gid[ibport - 1]);
472                 if (reason_code < 0) {
473                         rc = reason_code;
474                         goto out_err_unlock;
475                 }
476                 if (reason_code > 0)
477                         goto decline_rdma_unlock;
478         }
479 
480         mutex_unlock(&smc_create_lgr_pending);
481         smc_tx_init(smc);
482 
483 out_connected:
484         smc_copy_sock_settings_to_clc(smc);
485         if (smc->sk.sk_state == SMC_INIT)
486                 smc->sk.sk_state = SMC_ACTIVE;
487 
488         return rc ? rc : local_contact;
489 
490 decline_rdma_unlock:
491         mutex_unlock(&smc_create_lgr_pending);
492         smc_conn_free(&smc->conn);
493 decline_rdma:
494         /* RDMA setup failed, switch back to TCP */
495         smc->use_fallback = true;
496         if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) {
497                 rc = smc_clc_send_decline(smc, reason_code, 0);
498                 if (rc < sizeof(struct smc_clc_msg_decline))
499                         goto out_err;
500         }
501         goto out_connected;
502 
503 out_err_unlock:
504         mutex_unlock(&smc_create_lgr_pending);
505         smc_conn_free(&smc->conn);
506 out_err:
507         return rc;
508 }
509 
510 static int smc_connect(struct socket *sock, struct sockaddr *addr,
511                        int alen, int flags)
512 {
513         struct sock *sk = sock->sk;
514         struct smc_sock *smc;
515         int rc = -EINVAL;
516 
517         smc = smc_sk(sk);
518 
519         /* separate smc parameter checking to be safe */
520         if (alen < sizeof(addr->sa_family))
521                 goto out_err;
522         if (addr->sa_family != AF_INET)
523                 goto out_err;
524         smc->addr = addr;       /* needed for nonblocking connect */
525 
526         lock_sock(sk);
527         switch (sk->sk_state) {
528         default:
529                 goto out;
530         case SMC_ACTIVE:
531                 rc = -EISCONN;
532                 goto out;
533         case SMC_INIT:
534                 rc = 0;
535                 break;
536         }
537 
538         smc_copy_sock_settings_to_clc(smc);
539         rc = kernel_connect(smc->clcsock, addr, alen, flags);
540         if (rc)
541                 goto out;
542 
543         /* setup RDMA connection */
544         rc = smc_connect_rdma(smc);
545         if (rc < 0)
546                 goto out;
547         else
548                 rc = 0; /* success cases including fallback */
549 
550 out:
551         release_sock(sk);
552 out_err:
553         return rc;
554 }
555 
556 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
557 {
558         struct sock *sk = &lsmc->sk;
559         struct socket *new_clcsock;
560         struct sock *new_sk;
561         int rc;
562 
563         release_sock(&lsmc->sk);
564         new_sk = smc_sock_alloc(sock_net(sk), NULL);
565         if (!new_sk) {
566                 rc = -ENOMEM;
567                 lsmc->sk.sk_err = ENOMEM;
568                 *new_smc = NULL;
569                 lock_sock(&lsmc->sk);
570                 goto out;
571         }
572         *new_smc = smc_sk(new_sk);
573 
574         rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0);
575         lock_sock(&lsmc->sk);
576         if  (rc < 0) {
577                 lsmc->sk.sk_err = -rc;
578                 new_sk->sk_state = SMC_CLOSED;
579                 sock_set_flag(new_sk, SOCK_DEAD);
580                 sk->sk_prot->unhash(new_sk);
581                 sock_put(new_sk);
582                 *new_smc = NULL;
583                 goto out;
584         }
585         if (lsmc->sk.sk_state == SMC_CLOSED) {
586                 if (new_clcsock)
587                         sock_release(new_clcsock);
588                 new_sk->sk_state = SMC_CLOSED;
589                 sock_set_flag(new_sk, SOCK_DEAD);
590                 sk->sk_prot->unhash(new_sk);
591                 sock_put(new_sk);
592                 *new_smc = NULL;
593                 goto out;
594         }
595 
596         (*new_smc)->clcsock = new_clcsock;
597 out:
598         return rc;
599 }
600 
601 /* add a just created sock to the accept queue of the listen sock as
602  * candidate for a following socket accept call from user space
603  */
604 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
605 {
606         struct smc_sock *par = smc_sk(parent);
607 
608         sock_hold(sk);
609         spin_lock(&par->accept_q_lock);
610         list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
611         spin_unlock(&par->accept_q_lock);
612         sk_acceptq_added(parent);
613 }
614 
615 /* remove a socket from the accept queue of its parental listening socket */
616 static void smc_accept_unlink(struct sock *sk)
617 {
618         struct smc_sock *par = smc_sk(sk)->listen_smc;
619 
620         spin_lock(&par->accept_q_lock);
621         list_del_init(&smc_sk(sk)->accept_q);
622         spin_unlock(&par->accept_q_lock);
623         sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
624         sock_put(sk);
625 }
626 
627 /* remove a sock from the accept queue to bind it to a new socket created
628  * for a socket accept call from user space
629  */
630 struct sock *smc_accept_dequeue(struct sock *parent,
631                                 struct socket *new_sock)
632 {
633         struct smc_sock *isk, *n;
634         struct sock *new_sk;
635 
636         list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
637                 new_sk = (struct sock *)isk;
638 
639                 smc_accept_unlink(new_sk);
640                 if (new_sk->sk_state == SMC_CLOSED) {
641                         new_sk->sk_prot->unhash(new_sk);
642                         sock_put(new_sk);
643                         continue;
644                 }
645                 if (new_sock)
646                         sock_graft(new_sk, new_sock);
647                 return new_sk;
648         }
649         return NULL;
650 }
651 
652 /* clean up for a created but never accepted sock */
653 void smc_close_non_accepted(struct sock *sk)
654 {
655         struct smc_sock *smc = smc_sk(sk);
656 
657         sock_hold(sk);
658         lock_sock(sk);
659         if (!sk->sk_lingertime)
660                 /* wait for peer closing */
661                 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
662         if (smc->use_fallback) {
663                 sk->sk_state = SMC_CLOSED;
664         } else {
665                 smc_close_active(smc);
666                 sock_set_flag(sk, SOCK_DEAD);
667                 sk->sk_shutdown |= SHUTDOWN_MASK;
668         }
669         if (smc->clcsock) {
670                 struct socket *tcp;
671 
672                 tcp = smc->clcsock;
673                 smc->clcsock = NULL;
674                 sock_release(tcp);
675         }
676         if (smc->use_fallback) {
677                 schedule_delayed_work(&smc->sock_put_work, TCP_TIMEWAIT_LEN);
678         } else if (sk->sk_state == SMC_CLOSED) {
679                 smc_conn_free(&smc->conn);
680                 schedule_delayed_work(&smc->sock_put_work,
681                                       SMC_CLOSE_SOCK_PUT_DELAY);
682         }
683         release_sock(sk);
684         sock_put(sk);
685 }
686 
687 static int smc_serv_conf_first_link(struct smc_sock *smc)
688 {
689         struct smc_link_group *lgr = smc->conn.lgr;
690         struct smc_link *link;
691         int rest;
692         int rc;
693 
694         link = &lgr->lnk[SMC_SINGLE_LINK];
695         /* send CONFIRM LINK request to client over the RoCE fabric */
696         rc = smc_llc_send_confirm_link(link,
697                                        link->smcibdev->mac[link->ibport - 1],
698                                        &link->smcibdev->gid[link->ibport - 1],
699                                        SMC_LLC_REQ);
700         if (rc < 0)
701                 return SMC_CLC_DECL_TCL;
702 
703         /* receive CONFIRM LINK response from client over the RoCE fabric */
704         rest = wait_for_completion_interruptible_timeout(
705                 &link->llc_confirm_resp,
706                 SMC_LLC_WAIT_FIRST_TIME);
707         if (rest <= 0) {
708                 struct smc_clc_msg_decline dclc;
709 
710                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
711                                       SMC_CLC_DECLINE);
712         }
713 
714         return rc;
715 }
716 
717 /* setup for RDMA connection of server */
718 static void smc_listen_work(struct work_struct *work)
719 {
720         struct smc_sock *new_smc = container_of(work, struct smc_sock,
721                                                 smc_listen_work);
722         struct socket *newclcsock = new_smc->clcsock;
723         struct smc_sock *lsmc = new_smc->listen_smc;
724         struct smc_clc_msg_accept_confirm cclc;
725         int local_contact = SMC_REUSE_CONTACT;
726         struct sock *newsmcsk = &new_smc->sk;
727         struct smc_clc_msg_proposal pclc;
728         struct smc_ib_device *smcibdev;
729         struct sockaddr_in peeraddr;
730         struct smc_link *link;
731         int reason_code = 0;
732         int rc = 0, len;
733         __be32 subnet;
734         u8 prefix_len;
735         u8 ibport;
736 
737         /* do inband token exchange -
738          *wait for and receive SMC Proposal CLC message
739          */
740         reason_code = smc_clc_wait_msg(new_smc, &pclc, sizeof(pclc),
741                                        SMC_CLC_PROPOSAL);
742         if (reason_code < 0)
743                 goto out_err;
744         if (reason_code > 0)
745                 goto decline_rdma;
746 
747         /* IPSec connections opt out of SMC-R optimizations */
748         if (using_ipsec(new_smc)) {
749                 reason_code = SMC_CLC_DECL_IPSEC;
750                 goto decline_rdma;
751         }
752 
753         /* PNET table look up: search active ib_device and port
754          * within same PNETID that also contains the ethernet device
755          * used for the internal TCP socket
756          */
757         smc_pnet_find_roce_resource(newclcsock->sk, &smcibdev, &ibport);
758         if (!smcibdev) {
759                 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
760                 goto decline_rdma;
761         }
762 
763         /* determine subnet and mask from internal TCP socket */
764         rc = smc_netinfo_by_tcpsk(newclcsock, &subnet, &prefix_len);
765         if (rc) {
766                 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
767                 goto decline_rdma;
768         }
769         if ((pclc.outgoing_subnet != subnet) ||
770             (pclc.prefix_len != prefix_len)) {
771                 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
772                 goto decline_rdma;
773         }
774 
775         /* get address of the peer connected to the internal TCP socket */
776         kernel_getpeername(newclcsock, (struct sockaddr *)&peeraddr, &len);
777 
778         /* allocate connection / link group */
779         mutex_lock(&smc_create_lgr_pending);
780         local_contact = smc_conn_create(new_smc, peeraddr.sin_addr.s_addr,
781                                         smcibdev, ibport, &pclc.lcl, 0);
782         if (local_contact == SMC_REUSE_CONTACT)
783                 /* lock no longer needed, free it due to following
784                  * smc_clc_wait_msg() call
785                  */
786                 mutex_unlock(&smc_create_lgr_pending);
787         if (local_contact < 0) {
788                 rc = local_contact;
789                 if (rc == -ENOMEM)
790                         reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
791                 else if (rc == -ENOLINK)
792                         reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */
793                 goto decline_rdma;
794         }
795         link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
796 
797         rc = smc_sndbuf_create(new_smc);
798         if (rc) {
799                 reason_code = SMC_CLC_DECL_MEM;
800                 goto decline_rdma;
801         }
802         rc = smc_rmb_create(new_smc);
803         if (rc) {
804                 reason_code = SMC_CLC_DECL_MEM;
805                 goto decline_rdma;
806         }
807 
808         smc_close_init(new_smc);
809         smc_rx_init(new_smc);
810 
811         rc = smc_clc_send_accept(new_smc, local_contact);
812         if (rc)
813                 goto out_err;
814 
815         /* receive SMC Confirm CLC message */
816         reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
817                                        SMC_CLC_CONFIRM);
818         if (reason_code < 0)
819                 goto out_err;
820         if (reason_code > 0)
821                 goto decline_rdma;
822         smc_conn_save_peer_info(new_smc, &cclc);
823         if (local_contact == SMC_FIRST_CONTACT)
824                 smc_link_save_peer_info(link, &cclc);
825 
826         rc = smc_rmb_rtoken_handling(&new_smc->conn, &cclc);
827         if (rc) {
828                 reason_code = SMC_CLC_DECL_INTERR;
829                 goto decline_rdma;
830         }
831 
832         if (local_contact == SMC_FIRST_CONTACT) {
833                 rc = smc_ib_ready_link(link);
834                 if (rc) {
835                         reason_code = SMC_CLC_DECL_INTERR;
836                         goto decline_rdma;
837                 }
838                 /* QP confirmation over RoCE fabric */
839                 reason_code = smc_serv_conf_first_link(new_smc);
840                 if (reason_code < 0) {
841                         /* peer is not aware of a problem */
842                         rc = reason_code;
843                         goto out_err;
844                 }
845                 if (reason_code > 0)
846                         goto decline_rdma;
847         }
848 
849         smc_tx_init(new_smc);
850 
851 out_connected:
852         sk_refcnt_debug_inc(newsmcsk);
853         if (newsmcsk->sk_state == SMC_INIT)
854                 newsmcsk->sk_state = SMC_ACTIVE;
855 enqueue:
856         if (local_contact == SMC_FIRST_CONTACT)
857                 mutex_unlock(&smc_create_lgr_pending);
858         lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
859         if (lsmc->sk.sk_state == SMC_LISTEN) {
860                 smc_accept_enqueue(&lsmc->sk, newsmcsk);
861         } else { /* no longer listening */
862                 smc_close_non_accepted(newsmcsk);
863         }
864         release_sock(&lsmc->sk);
865 
866         /* Wake up accept */
867         lsmc->sk.sk_data_ready(&lsmc->sk);
868         sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
869         return;
870 
871 decline_rdma:
872         /* RDMA setup failed, switch back to TCP */
873         smc_conn_free(&new_smc->conn);
874         new_smc->use_fallback = true;
875         if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) {
876                 rc = smc_clc_send_decline(new_smc, reason_code, 0);
877                 if (rc < sizeof(struct smc_clc_msg_decline))
878                         goto out_err;
879         }
880         goto out_connected;
881 
882 out_err:
883         newsmcsk->sk_state = SMC_CLOSED;
884         smc_conn_free(&new_smc->conn);
885         goto enqueue; /* queue new sock with sk_err set */
886 }
887 
888 static void smc_tcp_listen_work(struct work_struct *work)
889 {
890         struct smc_sock *lsmc = container_of(work, struct smc_sock,
891                                              tcp_listen_work);
892         struct smc_sock *new_smc;
893         int rc = 0;
894 
895         lock_sock(&lsmc->sk);
896         while (lsmc->sk.sk_state == SMC_LISTEN) {
897                 rc = smc_clcsock_accept(lsmc, &new_smc);
898                 if (rc)
899                         goto out;
900                 if (!new_smc)
901                         continue;
902 
903                 new_smc->listen_smc = lsmc;
904                 new_smc->use_fallback = false; /* assume rdma capability first*/
905                 sock_hold(&lsmc->sk); /* sock_put in smc_listen_work */
906                 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
907                 smc_copy_sock_settings_to_smc(new_smc);
908                 schedule_work(&new_smc->smc_listen_work);
909         }
910 
911 out:
912         release_sock(&lsmc->sk);
913         lsmc->sk.sk_data_ready(&lsmc->sk); /* no more listening, wake accept */
914 }
915 
916 static int smc_listen(struct socket *sock, int backlog)
917 {
918         struct sock *sk = sock->sk;
919         struct smc_sock *smc;
920         int rc;
921 
922         smc = smc_sk(sk);
923         lock_sock(sk);
924 
925         rc = -EINVAL;
926         if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN))
927                 goto out;
928 
929         rc = 0;
930         if (sk->sk_state == SMC_LISTEN) {
931                 sk->sk_max_ack_backlog = backlog;
932                 goto out;
933         }
934         /* some socket options are handled in core, so we could not apply
935          * them to the clc socket -- copy smc socket options to clc socket
936          */
937         smc_copy_sock_settings_to_clc(smc);
938 
939         rc = kernel_listen(smc->clcsock, backlog);
940         if (rc)
941                 goto out;
942         sk->sk_max_ack_backlog = backlog;
943         sk->sk_ack_backlog = 0;
944         sk->sk_state = SMC_LISTEN;
945         INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
946         schedule_work(&smc->tcp_listen_work);
947 
948 out:
949         release_sock(sk);
950         return rc;
951 }
952 
953 static int smc_accept(struct socket *sock, struct socket *new_sock,
954                       int flags, bool kern)
955 {
956         struct sock *sk = sock->sk, *nsk;
957         DECLARE_WAITQUEUE(wait, current);
958         struct smc_sock *lsmc;
959         long timeo;
960         int rc = 0;
961 
962         lsmc = smc_sk(sk);
963         lock_sock(sk);
964 
965         if (lsmc->sk.sk_state != SMC_LISTEN) {
966                 rc = -EINVAL;
967                 goto out;
968         }
969 
970         /* Wait for an incoming connection */
971         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
972         add_wait_queue_exclusive(sk_sleep(sk), &wait);
973         while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
974                 set_current_state(TASK_INTERRUPTIBLE);
975                 if (!timeo) {
976                         rc = -EAGAIN;
977                         break;
978                 }
979                 release_sock(sk);
980                 timeo = schedule_timeout(timeo);
981                 /* wakeup by sk_data_ready in smc_listen_work() */
982                 sched_annotate_sleep();
983                 lock_sock(sk);
984                 if (signal_pending(current)) {
985                         rc = sock_intr_errno(timeo);
986                         break;
987                 }
988         }
989         set_current_state(TASK_RUNNING);
990         remove_wait_queue(sk_sleep(sk), &wait);
991 
992         if (!rc)
993                 rc = sock_error(nsk);
994 
995 out:
996         release_sock(sk);
997         return rc;
998 }
999 
1000 static int smc_getname(struct socket *sock, struct sockaddr *addr,
1001                        int *len, int peer)
1002 {
1003         struct smc_sock *smc;
1004 
1005         if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
1006             (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
1007                 return -ENOTCONN;
1008 
1009         smc = smc_sk(sock->sk);
1010 
1011         return smc->clcsock->ops->getname(smc->clcsock, addr, len, peer);
1012 }
1013 
1014 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1015 {
1016         struct sock *sk = sock->sk;
1017         struct smc_sock *smc;
1018         int rc = -EPIPE;
1019 
1020         smc = smc_sk(sk);
1021         lock_sock(sk);
1022         if ((sk->sk_state != SMC_ACTIVE) &&
1023             (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1024             (sk->sk_state != SMC_INIT))
1025                 goto out;
1026         if (smc->use_fallback)
1027                 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
1028         else
1029                 rc = smc_tx_sendmsg(smc, msg, len);
1030 out:
1031         release_sock(sk);
1032         return rc;
1033 }
1034 
1035 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1036                        int flags)
1037 {
1038         struct sock *sk = sock->sk;
1039         struct smc_sock *smc;
1040         int rc = -ENOTCONN;
1041 
1042         smc = smc_sk(sk);
1043         lock_sock(sk);
1044         if ((sk->sk_state == SMC_INIT) ||
1045             (sk->sk_state == SMC_LISTEN) ||
1046             (sk->sk_state == SMC_CLOSED))
1047                 goto out;
1048 
1049         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1050                 rc = 0;
1051                 goto out;
1052         }
1053 
1054         if (smc->use_fallback)
1055                 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
1056         else
1057                 rc = smc_rx_recvmsg(smc, msg, len, flags);
1058 
1059 out:
1060         release_sock(sk);
1061         return rc;
1062 }
1063 
1064 static unsigned int smc_accept_poll(struct sock *parent)
1065 {
1066         struct smc_sock *isk;
1067         struct sock *sk;
1068 
1069         lock_sock(parent);
1070         list_for_each_entry(isk, &smc_sk(parent)->accept_q, accept_q) {
1071                 sk = (struct sock *)isk;
1072 
1073                 if (sk->sk_state == SMC_ACTIVE) {
1074                         release_sock(parent);
1075                         return POLLIN | POLLRDNORM;
1076                 }
1077         }
1078         release_sock(parent);
1079 
1080         return 0;
1081 }
1082 
1083 static unsigned int smc_poll(struct file *file, struct socket *sock,
1084                              poll_table *wait)
1085 {
1086         struct sock *sk = sock->sk;
1087         unsigned int mask = 0;
1088         struct smc_sock *smc;
1089         int rc;
1090 
1091         smc = smc_sk(sock->sk);
1092         if ((sk->sk_state == SMC_INIT) || smc->use_fallback) {
1093                 /* delegate to CLC child sock */
1094                 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
1095                 /* if non-blocking connect finished ... */
1096                 lock_sock(sk);
1097                 if ((sk->sk_state == SMC_INIT) && (mask & POLLOUT)) {
1098                         sk->sk_err = smc->clcsock->sk->sk_err;
1099                         if (sk->sk_err) {
1100                                 mask |= POLLERR;
1101                         } else {
1102                                 rc = smc_connect_rdma(smc);
1103                                 if (rc < 0)
1104                                         mask |= POLLERR;
1105                                 else
1106                                         /* success cases including fallback */
1107                                         mask |= POLLOUT | POLLWRNORM;
1108                         }
1109                 }
1110                 release_sock(sk);
1111         } else {
1112                 sock_poll_wait(file, sk_sleep(sk), wait);
1113                 if (sk->sk_state == SMC_LISTEN)
1114                         /* woken up by sk_data_ready in smc_listen_work() */
1115                         mask |= smc_accept_poll(sk);
1116                 if (sk->sk_err)
1117                         mask |= POLLERR;
1118                 if (atomic_read(&smc->conn.sndbuf_space) ||
1119                     (sk->sk_shutdown & SEND_SHUTDOWN)) {
1120                         mask |= POLLOUT | POLLWRNORM;
1121                 } else {
1122                         sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1123                         set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1124                 }
1125                 if (atomic_read(&smc->conn.bytes_to_rcv))
1126                         mask |= POLLIN | POLLRDNORM;
1127                 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
1128                     (sk->sk_state == SMC_CLOSED))
1129                         mask |= POLLHUP;
1130                 if (sk->sk_shutdown & RCV_SHUTDOWN)
1131                         mask |= POLLIN | POLLRDNORM | POLLRDHUP;
1132                 if (sk->sk_state == SMC_APPCLOSEWAIT1)
1133                         mask |= POLLIN;
1134 
1135         }
1136 
1137         return mask;
1138 }
1139 
1140 static int smc_shutdown(struct socket *sock, int how)
1141 {
1142         struct sock *sk = sock->sk;
1143         struct smc_sock *smc;
1144         int rc = -EINVAL;
1145         int rc1 = 0;
1146 
1147         smc = smc_sk(sk);
1148 
1149         if ((how < SHUT_RD) || (how > SHUT_RDWR))
1150                 return rc;
1151 
1152         lock_sock(sk);
1153 
1154         rc = -ENOTCONN;
1155         if ((sk->sk_state != SMC_LISTEN) &&
1156             (sk->sk_state != SMC_ACTIVE) &&
1157             (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
1158             (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
1159             (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1160             (sk->sk_state != SMC_APPCLOSEWAIT2) &&
1161             (sk->sk_state != SMC_APPFINCLOSEWAIT))
1162                 goto out;
1163         if (smc->use_fallback) {
1164                 rc = kernel_sock_shutdown(smc->clcsock, how);
1165                 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
1166                 if (sk->sk_shutdown == SHUTDOWN_MASK)
1167                         sk->sk_state = SMC_CLOSED;
1168                 goto out;
1169         }
1170         switch (how) {
1171         case SHUT_RDWR:         /* shutdown in both directions */
1172                 rc = smc_close_active(smc);
1173                 break;
1174         case SHUT_WR:
1175                 rc = smc_close_shutdown_write(smc);
1176                 break;
1177         case SHUT_RD:
1178                 if (sk->sk_state == SMC_LISTEN)
1179                         rc = smc_close_active(smc);
1180                 else
1181                         rc = 0;
1182                         /* nothing more to do because peer is not involved */
1183                 break;
1184         }
1185         rc1 = kernel_sock_shutdown(smc->clcsock, how);
1186         /* map sock_shutdown_cmd constants to sk_shutdown value range */
1187         sk->sk_shutdown |= how + 1;
1188 
1189 out:
1190         release_sock(sk);
1191         return rc ? rc : rc1;
1192 }
1193 
1194 static int smc_setsockopt(struct socket *sock, int level, int optname,
1195                           char __user *optval, unsigned int optlen)
1196 {
1197         struct sock *sk = sock->sk;
1198         struct smc_sock *smc;
1199 
1200         smc = smc_sk(sk);
1201 
1202         /* generic setsockopts reaching us here always apply to the
1203          * CLC socket
1204          */
1205         return smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
1206                                              optval, optlen);
1207 }
1208 
1209 static int smc_getsockopt(struct socket *sock, int level, int optname,
1210                           char __user *optval, int __user *optlen)
1211 {
1212         struct smc_sock *smc;
1213 
1214         smc = smc_sk(sock->sk);
1215         /* socket options apply to the CLC socket */
1216         return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
1217                                              optval, optlen);
1218 }
1219 
1220 static int smc_ioctl(struct socket *sock, unsigned int cmd,
1221                      unsigned long arg)
1222 {
1223         struct smc_sock *smc;
1224 
1225         smc = smc_sk(sock->sk);
1226         if (smc->use_fallback)
1227                 return smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
1228         else
1229                 return sock_no_ioctl(sock, cmd, arg);
1230 }
1231 
1232 static ssize_t smc_sendpage(struct socket *sock, struct page *page,
1233                             int offset, size_t size, int flags)
1234 {
1235         struct sock *sk = sock->sk;
1236         struct smc_sock *smc;
1237         int rc = -EPIPE;
1238 
1239         smc = smc_sk(sk);
1240         lock_sock(sk);
1241         if (sk->sk_state != SMC_ACTIVE)
1242                 goto out;
1243         if (smc->use_fallback)
1244                 rc = kernel_sendpage(smc->clcsock, page, offset,
1245                                      size, flags);
1246         else
1247                 rc = sock_no_sendpage(sock, page, offset, size, flags);
1248 
1249 out:
1250         release_sock(sk);
1251         return rc;
1252 }
1253 
1254 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
1255                                struct pipe_inode_info *pipe, size_t len,
1256                                     unsigned int flags)
1257 {
1258         struct sock *sk = sock->sk;
1259         struct smc_sock *smc;
1260         int rc = -ENOTCONN;
1261 
1262         smc = smc_sk(sk);
1263         lock_sock(sk);
1264         if ((sk->sk_state != SMC_ACTIVE) && (sk->sk_state != SMC_CLOSED))
1265                 goto out;
1266         if (smc->use_fallback) {
1267                 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
1268                                                     pipe, len, flags);
1269         } else {
1270                 rc = -EOPNOTSUPP;
1271         }
1272 out:
1273         release_sock(sk);
1274         return rc;
1275 }
1276 
1277 /* must look like tcp */
1278 static const struct proto_ops smc_sock_ops = {
1279         .family         = PF_SMC,
1280         .owner          = THIS_MODULE,
1281         .release        = smc_release,
1282         .bind           = smc_bind,
1283         .connect        = smc_connect,
1284         .socketpair     = sock_no_socketpair,
1285         .accept         = smc_accept,
1286         .getname        = smc_getname,
1287         .poll           = smc_poll,
1288         .ioctl          = smc_ioctl,
1289         .listen         = smc_listen,
1290         .shutdown       = smc_shutdown,
1291         .setsockopt     = smc_setsockopt,
1292         .getsockopt     = smc_getsockopt,
1293         .sendmsg        = smc_sendmsg,
1294         .recvmsg        = smc_recvmsg,
1295         .mmap           = sock_no_mmap,
1296         .sendpage       = smc_sendpage,
1297         .splice_read    = smc_splice_read,
1298 };
1299 
1300 static int smc_create(struct net *net, struct socket *sock, int protocol,
1301                       int kern)
1302 {
1303         struct smc_sock *smc;
1304         struct sock *sk;
1305         int rc;
1306 
1307         rc = -ESOCKTNOSUPPORT;
1308         if (sock->type != SOCK_STREAM)
1309                 goto out;
1310 
1311         rc = -EPROTONOSUPPORT;
1312         if ((protocol != IPPROTO_IP) && (protocol != IPPROTO_TCP))
1313                 goto out;
1314 
1315         rc = -ENOBUFS;
1316         sock->ops = &smc_sock_ops;
1317         sk = smc_sock_alloc(net, sock);
1318         if (!sk)
1319                 goto out;
1320 
1321         /* create internal TCP socket for CLC handshake and fallback */
1322         smc = smc_sk(sk);
1323         smc->use_fallback = false; /* assume rdma capability first */
1324         rc = sock_create_kern(net, PF_INET, SOCK_STREAM,
1325                               IPPROTO_TCP, &smc->clcsock);
1326         if (rc)
1327                 sk_common_release(sk);
1328         smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
1329         smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
1330 
1331 out:
1332         return rc;
1333 }
1334 
1335 static const struct net_proto_family smc_sock_family_ops = {
1336         .family = PF_SMC,
1337         .owner  = THIS_MODULE,
1338         .create = smc_create,
1339 };
1340 
1341 static int __init smc_init(void)
1342 {
1343         int rc;
1344 
1345         rc = smc_pnet_init();
1346         if (rc)
1347                 return rc;
1348 
1349         rc = smc_llc_init();
1350         if (rc) {
1351                 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
1352                 goto out_pnet;
1353         }
1354 
1355         rc = smc_cdc_init();
1356         if (rc) {
1357                 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
1358                 goto out_pnet;
1359         }
1360 
1361         rc = proto_register(&smc_proto, 1);
1362         if (rc) {
1363                 pr_err("%s: proto_register fails with %d\n", __func__, rc);
1364                 goto out_pnet;
1365         }
1366 
1367         rc = sock_register(&smc_sock_family_ops);
1368         if (rc) {
1369                 pr_err("%s: sock_register fails with %d\n", __func__, rc);
1370                 goto out_proto;
1371         }
1372         INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
1373 
1374         rc = smc_ib_register_client();
1375         if (rc) {
1376                 pr_err("%s: ib_register fails with %d\n", __func__, rc);
1377                 goto out_sock;
1378         }
1379 
1380         return 0;
1381 
1382 out_sock:
1383         sock_unregister(PF_SMC);
1384 out_proto:
1385         proto_unregister(&smc_proto);
1386 out_pnet:
1387         smc_pnet_exit();
1388         return rc;
1389 }
1390 
1391 static void __exit smc_exit(void)
1392 {
1393         struct smc_link_group *lgr, *lg;
1394         LIST_HEAD(lgr_freeing_list);
1395 
1396         spin_lock_bh(&smc_lgr_list.lock);
1397         if (!list_empty(&smc_lgr_list.list))
1398                 list_splice_init(&smc_lgr_list.list, &lgr_freeing_list);
1399         spin_unlock_bh(&smc_lgr_list.lock);
1400         list_for_each_entry_safe(lgr, lg, &lgr_freeing_list, list) {
1401                 list_del_init(&lgr->list);
1402                 smc_lgr_free(lgr); /* free link group */
1403         }
1404         smc_ib_unregister_client();
1405         sock_unregister(PF_SMC);
1406         proto_unregister(&smc_proto);
1407         smc_pnet_exit();
1408 }
1409 
1410 module_init(smc_init);
1411 module_exit(smc_exit);
1412 
1413 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
1414 MODULE_DESCRIPTION("smc socket address family");
1415 MODULE_LICENSE("GPL");
1416 MODULE_ALIAS_NETPROTO(PF_SMC);
1417 

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