2 * Shared Memory Communications over RDMA (SMC-R) and RoCE
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
9 * Initial restrictions:
10 * - support for alternate links postponed
12 * Copyright IBM Corp. 2016, 2018
14 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
15 * based on prototype from Frank Blaschka
18 #define KMSG_COMPONENT "smc"
19 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
21 #include <linux/module.h>
22 #include <linux/socket.h>
23 #include <linux/workqueue.h>
25 #include <linux/sched/signal.h>
26 #include <linux/if_vlan.h>
31 #include <asm/ioctls.h>
43 #include "smc_close.h"
45 static DEFINE_MUTEX(smc_create_lgr_pending); /* serialize link group
49 static void smc_tcp_listen_work(struct work_struct *);
50 static void smc_connect_work(struct work_struct *);
52 static void smc_set_keepalive(struct sock *sk, int val)
54 struct smc_sock *smc = smc_sk(sk);
56 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
59 static struct smc_hashinfo smc_v4_hashinfo = {
60 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
63 static struct smc_hashinfo smc_v6_hashinfo = {
64 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
67 int smc_hash_sk(struct sock *sk)
69 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
70 struct hlist_head *head;
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);
81 EXPORT_SYMBOL_GPL(smc_hash_sk);
83 void smc_unhash_sk(struct sock *sk)
85 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
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);
92 EXPORT_SYMBOL_GPL(smc_unhash_sk);
94 struct proto smc_proto = {
97 .keepalive = smc_set_keepalive,
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,
104 EXPORT_SYMBOL_GPL(smc_proto);
106 struct proto smc_proto6 = {
108 .owner = THIS_MODULE,
109 .keepalive = smc_set_keepalive,
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,
116 EXPORT_SYMBOL_GPL(smc_proto6);
118 static int smc_release(struct socket *sock)
120 struct sock *sk = sock->sk;
121 struct smc_sock *smc;
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;
136 if (sk->sk_state == SMC_LISTEN)
137 /* smc_close_non_accepted() is called and acquires
138 * sock lock for child sockets again
140 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
144 if (!smc->use_fallback) {
145 rc = smc_close_active(smc);
146 sock_set_flag(sk, SOCK_DEAD);
147 sk->sk_shutdown |= SHUTDOWN_MASK;
150 if (smc->use_fallback && sk->sk_state == SMC_LISTEN) {
151 /* wake up clcsock accept */
152 rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
154 mutex_lock(&smc->clcsock_release_lock);
155 sock_release(smc->clcsock);
157 mutex_unlock(&smc->clcsock_release_lock);
159 if (smc->use_fallback) {
160 if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT)
161 sock_put(sk); /* passive closing */
162 sk->sk_state = SMC_CLOSED;
163 sk->sk_state_change(sk);
169 if (!smc->use_fallback && sk->sk_state == SMC_CLOSED)
170 smc_conn_free(&smc->conn);
173 sk->sk_prot->unhash(sk);
174 sock_put(sk); /* final sock_put */
179 static void smc_destruct(struct sock *sk)
181 if (sk->sk_state != SMC_CLOSED)
183 if (!sock_flag(sk, SOCK_DEAD))
186 sk_refcnt_debug_dec(sk);
189 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
192 struct smc_sock *smc;
196 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
197 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
201 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
202 sk->sk_state = SMC_INIT;
203 sk->sk_destruct = smc_destruct;
204 sk->sk_protocol = protocol;
206 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
207 INIT_WORK(&smc->connect_work, smc_connect_work);
208 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
209 INIT_LIST_HEAD(&smc->accept_q);
210 spin_lock_init(&smc->accept_q_lock);
211 spin_lock_init(&smc->conn.send_lock);
212 sk->sk_prot->hash(sk);
213 sk_refcnt_debug_inc(sk);
214 mutex_init(&smc->clcsock_release_lock);
219 static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
222 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
223 struct sock *sk = sock->sk;
224 struct smc_sock *smc;
229 /* replicate tests from inet_bind(), to be safe wrt. future changes */
231 if (addr_len < sizeof(struct sockaddr_in))
235 if (addr->sin_family != AF_INET &&
236 addr->sin_family != AF_INET6 &&
237 addr->sin_family != AF_UNSPEC)
239 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
240 if (addr->sin_family == AF_UNSPEC &&
241 addr->sin_addr.s_addr != htonl(INADDR_ANY))
246 /* Check if socket is already active */
248 if (sk->sk_state != SMC_INIT)
251 smc->clcsock->sk->sk_reuse = sk->sk_reuse;
252 rc = kernel_bind(smc->clcsock, uaddr, addr_len);
260 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
263 /* options we don't get control via setsockopt for */
264 nsk->sk_type = osk->sk_type;
265 nsk->sk_sndbuf = osk->sk_sndbuf;
266 nsk->sk_rcvbuf = osk->sk_rcvbuf;
267 nsk->sk_sndtimeo = osk->sk_sndtimeo;
268 nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
269 nsk->sk_mark = osk->sk_mark;
270 nsk->sk_priority = osk->sk_priority;
271 nsk->sk_rcvlowat = osk->sk_rcvlowat;
272 nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
273 nsk->sk_err = osk->sk_err;
275 nsk->sk_flags &= ~mask;
276 nsk->sk_flags |= osk->sk_flags & mask;
279 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
280 (1UL << SOCK_KEEPOPEN) | \
281 (1UL << SOCK_LINGER) | \
282 (1UL << SOCK_BROADCAST) | \
283 (1UL << SOCK_TIMESTAMP) | \
284 (1UL << SOCK_DBG) | \
285 (1UL << SOCK_RCVTSTAMP) | \
286 (1UL << SOCK_RCVTSTAMPNS) | \
287 (1UL << SOCK_LOCALROUTE) | \
288 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
289 (1UL << SOCK_RXQ_OVFL) | \
290 (1UL << SOCK_WIFI_STATUS) | \
291 (1UL << SOCK_NOFCS) | \
292 (1UL << SOCK_FILTER_LOCKED))
293 /* copy only relevant settings and flags of SOL_SOCKET level from smc to
294 * clc socket (since smc is not called for these options from net/core)
296 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
298 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
301 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
302 (1UL << SOCK_KEEPOPEN) | \
303 (1UL << SOCK_LINGER) | \
305 /* copy only settings and flags relevant for smc from clc to smc socket */
306 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
308 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
311 /* register a new rmb, optionally send confirm_rkey msg to register with peer */
312 static int smc_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc,
315 /* register memory region for new rmb */
316 if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) {
317 rmb_desc->regerr = 1;
322 /* exchange confirm_rkey msg with peer */
323 if (smc_llc_do_confirm_rkey(link, rmb_desc)) {
324 rmb_desc->regerr = 1;
330 static int smc_clnt_conf_first_link(struct smc_sock *smc)
332 struct net *net = sock_net(smc->clcsock->sk);
333 struct smc_link_group *lgr = smc->conn.lgr;
334 struct smc_link *link;
338 link = &lgr->lnk[SMC_SINGLE_LINK];
339 /* receive CONFIRM LINK request from server over RoCE fabric */
340 rest = wait_for_completion_interruptible_timeout(
342 SMC_LLC_WAIT_FIRST_TIME);
344 struct smc_clc_msg_decline dclc;
346 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
351 if (link->llc_confirm_rc)
352 return SMC_CLC_DECL_RMBE_EC;
354 rc = smc_ib_modify_qp_rts(link);
356 return SMC_CLC_DECL_ERR_RDYLNK;
358 smc_wr_remember_qp_attr(link);
360 if (smc_reg_rmb(link, smc->conn.rmb_desc, false))
361 return SMC_CLC_DECL_ERR_REGRMB;
363 /* send CONFIRM LINK response over RoCE fabric */
364 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
366 return SMC_CLC_DECL_TIMEOUT_CL;
368 /* receive ADD LINK request from server over RoCE fabric */
369 rest = wait_for_completion_interruptible_timeout(&link->llc_add,
372 struct smc_clc_msg_decline dclc;
374 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
379 /* send add link reject message, only one link supported for now */
380 rc = smc_llc_send_add_link(link,
381 link->smcibdev->mac[link->ibport - 1],
382 link->gid, SMC_LLC_RESP);
384 return SMC_CLC_DECL_TIMEOUT_AL;
386 smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time);
391 static void smcr_conn_save_peer_info(struct smc_sock *smc,
392 struct smc_clc_msg_accept_confirm *clc)
394 int bufsize = smc_uncompress_bufsize(clc->rmbe_size);
396 smc->conn.peer_rmbe_idx = clc->rmbe_idx;
397 smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token);
398 smc->conn.peer_rmbe_size = bufsize;
399 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
400 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
403 static void smcd_conn_save_peer_info(struct smc_sock *smc,
404 struct smc_clc_msg_accept_confirm *clc)
406 int bufsize = smc_uncompress_bufsize(clc->dmbe_size);
408 smc->conn.peer_rmbe_idx = clc->dmbe_idx;
409 smc->conn.peer_token = clc->token;
410 /* msg header takes up space in the buffer */
411 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
412 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
413 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
416 static void smc_conn_save_peer_info(struct smc_sock *smc,
417 struct smc_clc_msg_accept_confirm *clc)
419 if (smc->conn.lgr->is_smcd)
420 smcd_conn_save_peer_info(smc, clc);
422 smcr_conn_save_peer_info(smc, clc);
425 static void smc_link_save_peer_info(struct smc_link *link,
426 struct smc_clc_msg_accept_confirm *clc)
428 link->peer_qpn = ntoh24(clc->qpn);
429 memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE);
430 memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac));
431 link->peer_psn = ntoh24(clc->psn);
432 link->peer_mtu = clc->qp_mtu;
435 /* fall back during connect */
436 static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
438 smc->use_fallback = true;
439 smc->fallback_rsn = reason_code;
440 smc_copy_sock_settings_to_clc(smc);
441 if (smc->sk.sk_state == SMC_INIT)
442 smc->sk.sk_state = SMC_ACTIVE;
446 /* decline and fall back during connect */
447 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code)
451 if (reason_code < 0) { /* error, fallback is not possible */
452 if (smc->sk.sk_state == SMC_INIT)
453 sock_put(&smc->sk); /* passive closing */
456 if (reason_code != SMC_CLC_DECL_PEERDECL) {
457 rc = smc_clc_send_decline(smc, reason_code);
459 if (smc->sk.sk_state == SMC_INIT)
460 sock_put(&smc->sk); /* passive closing */
464 return smc_connect_fallback(smc, reason_code);
467 /* abort connecting */
468 static int smc_connect_abort(struct smc_sock *smc, int reason_code,
471 if (local_contact == SMC_FIRST_CONTACT)
472 smc_lgr_forget(smc->conn.lgr);
473 mutex_unlock(&smc_create_lgr_pending);
474 smc_conn_free(&smc->conn);
478 /* check if there is a rdma device available for this connection. */
479 /* called for connect and listen */
480 static int smc_check_rdma(struct smc_sock *smc, struct smc_ib_device **ibdev,
481 u8 *ibport, unsigned short vlan_id, u8 gid[])
485 /* PNET table look up: search active ib_device and port
486 * within same PNETID that also contains the ethernet device
487 * used for the internal TCP socket
489 smc_pnet_find_roce_resource(smc->clcsock->sk, ibdev, ibport, vlan_id,
492 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
497 /* check if there is an ISM device available for this connection. */
498 /* called for connect and listen */
499 static int smc_check_ism(struct smc_sock *smc, struct smcd_dev **ismdev)
501 /* Find ISM device with same PNETID as connecting interface */
502 smc_pnet_find_ism_resource(smc->clcsock->sk, ismdev);
504 return SMC_CLC_DECL_CNFERR; /* configuration error */
508 /* Check for VLAN ID and register it on ISM device just for CLC handshake */
509 static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
510 struct smcd_dev *ismdev,
511 unsigned short vlan_id)
513 if (vlan_id && smc_ism_get_vlan(ismdev, vlan_id))
514 return SMC_CLC_DECL_CNFERR;
518 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
519 * used, the VLAN ID will be registered again during the connection setup.
521 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, bool is_smcd,
522 struct smcd_dev *ismdev,
523 unsigned short vlan_id)
527 if (vlan_id && smc_ism_put_vlan(ismdev, vlan_id))
528 return SMC_CLC_DECL_CNFERR;
532 /* CLC handshake during connect */
533 static int smc_connect_clc(struct smc_sock *smc, int smc_type,
534 struct smc_clc_msg_accept_confirm *aclc,
535 struct smc_ib_device *ibdev, u8 ibport,
536 u8 gid[], struct smcd_dev *ismdev)
540 /* do inband token exchange */
541 rc = smc_clc_send_proposal(smc, smc_type, ibdev, ibport, gid, ismdev);
544 /* receive SMC Accept CLC message */
545 return smc_clc_wait_msg(smc, aclc, sizeof(*aclc), SMC_CLC_ACCEPT);
548 /* setup for RDMA connection of client */
549 static int smc_connect_rdma(struct smc_sock *smc,
550 struct smc_clc_msg_accept_confirm *aclc,
551 struct smc_ib_device *ibdev, u8 ibport)
553 int local_contact = SMC_FIRST_CONTACT;
554 struct smc_link *link;
557 mutex_lock(&smc_create_lgr_pending);
558 local_contact = smc_conn_create(smc, false, aclc->hdr.flag, ibdev,
559 ibport, ntoh24(aclc->qpn), &aclc->lcl,
561 if (local_contact < 0) {
562 if (local_contact == -ENOMEM)
563 reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
564 else if (local_contact == -ENOLINK)
565 reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */
567 reason_code = SMC_CLC_DECL_INTERR; /* other error */
568 return smc_connect_abort(smc, reason_code, 0);
570 link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK];
572 smc_conn_save_peer_info(smc, aclc);
574 /* create send buffer and rmb */
575 if (smc_buf_create(smc, false))
576 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact);
578 if (local_contact == SMC_FIRST_CONTACT)
579 smc_link_save_peer_info(link, aclc);
581 if (smc_rmb_rtoken_handling(&smc->conn, aclc))
582 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RTOK,
588 if (local_contact == SMC_FIRST_CONTACT) {
589 if (smc_ib_ready_link(link))
590 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RDYLNK,
593 if (!smc->conn.rmb_desc->reused &&
594 smc_reg_rmb(link, smc->conn.rmb_desc, true))
595 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_REGRMB,
598 smc_rmb_sync_sg_for_device(&smc->conn);
600 reason_code = smc_clc_send_confirm(smc);
602 return smc_connect_abort(smc, reason_code, local_contact);
606 if (local_contact == SMC_FIRST_CONTACT) {
607 /* QP confirmation over RoCE fabric */
608 reason_code = smc_clnt_conf_first_link(smc);
610 return smc_connect_abort(smc, reason_code,
613 mutex_unlock(&smc_create_lgr_pending);
615 smc_copy_sock_settings_to_clc(smc);
616 if (smc->sk.sk_state == SMC_INIT)
617 smc->sk.sk_state = SMC_ACTIVE;
622 /* setup for ISM connection of client */
623 static int smc_connect_ism(struct smc_sock *smc,
624 struct smc_clc_msg_accept_confirm *aclc,
625 struct smcd_dev *ismdev)
627 int local_contact = SMC_FIRST_CONTACT;
630 mutex_lock(&smc_create_lgr_pending);
631 local_contact = smc_conn_create(smc, true, aclc->hdr.flag, NULL, 0, 0,
632 NULL, ismdev, aclc->gid);
633 if (local_contact < 0)
634 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, 0);
636 /* Create send and receive buffers */
637 if (smc_buf_create(smc, true))
638 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact);
640 smc_conn_save_peer_info(smc, aclc);
645 rc = smc_clc_send_confirm(smc);
647 return smc_connect_abort(smc, rc, local_contact);
648 mutex_unlock(&smc_create_lgr_pending);
650 smc_copy_sock_settings_to_clc(smc);
651 if (smc->sk.sk_state == SMC_INIT)
652 smc->sk.sk_state = SMC_ACTIVE;
657 /* perform steps before actually connecting */
658 static int __smc_connect(struct smc_sock *smc)
660 bool ism_supported = false, rdma_supported = false;
661 struct smc_clc_msg_accept_confirm aclc;
662 struct smc_ib_device *ibdev;
663 struct smcd_dev *ismdev;
664 u8 gid[SMC_GID_SIZE];
670 sock_hold(&smc->sk); /* sock put in passive closing */
672 if (smc->use_fallback)
673 return smc_connect_fallback(smc, smc->fallback_rsn);
675 /* if peer has not signalled SMC-capability, fall back */
676 if (!tcp_sk(smc->clcsock->sk)->syn_smc)
677 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
679 /* IPSec connections opt out of SMC-R optimizations */
680 if (using_ipsec(smc))
681 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC);
683 /* check for VLAN ID */
684 if (smc_vlan_by_tcpsk(smc->clcsock, &vlan))
685 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_CNFERR);
687 /* check if there is an ism device available */
688 if (!smc_check_ism(smc, &ismdev) &&
689 !smc_connect_ism_vlan_setup(smc, ismdev, vlan)) {
690 /* ISM is supported for this connection */
691 ism_supported = true;
692 smc_type = SMC_TYPE_D;
695 /* check if there is a rdma device available */
696 if (!smc_check_rdma(smc, &ibdev, &ibport, vlan, gid)) {
697 /* RDMA is supported for this connection */
698 rdma_supported = true;
700 smc_type = SMC_TYPE_B; /* both */
702 smc_type = SMC_TYPE_R; /* only RDMA */
705 /* if neither ISM nor RDMA are supported, fallback */
706 if (!rdma_supported && !ism_supported)
707 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_NOSMCDEV);
709 /* perform CLC handshake */
710 rc = smc_connect_clc(smc, smc_type, &aclc, ibdev, ibport, gid, ismdev);
712 smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan);
713 return smc_connect_decline_fallback(smc, rc);
716 /* depending on previous steps, connect using rdma or ism */
717 if (rdma_supported && aclc.hdr.path == SMC_TYPE_R)
718 rc = smc_connect_rdma(smc, &aclc, ibdev, ibport);
719 else if (ism_supported && aclc.hdr.path == SMC_TYPE_D)
720 rc = smc_connect_ism(smc, &aclc, ismdev);
722 rc = SMC_CLC_DECL_MODEUNSUPP;
724 smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan);
725 return smc_connect_decline_fallback(smc, rc);
728 smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan);
732 static void smc_connect_work(struct work_struct *work)
734 struct smc_sock *smc = container_of(work, struct smc_sock,
739 rc = kernel_connect(smc->clcsock, &smc->connect_info->addr,
740 smc->connect_info->alen, smc->connect_info->flags);
741 if (smc->clcsock->sk->sk_err) {
742 smc->sk.sk_err = smc->clcsock->sk->sk_err;
746 smc->sk.sk_err = -rc;
750 rc = __smc_connect(smc);
752 smc->sk.sk_err = -rc;
756 smc->sk.sk_state_change(&smc->sk);
758 smc->sk.sk_write_space(&smc->sk);
759 kfree(smc->connect_info);
760 smc->connect_info = NULL;
761 release_sock(&smc->sk);
764 static int smc_connect(struct socket *sock, struct sockaddr *addr,
767 struct sock *sk = sock->sk;
768 struct smc_sock *smc;
773 /* separate smc parameter checking to be safe */
774 if (alen < sizeof(addr->sa_family))
776 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
780 switch (sk->sk_state) {
791 smc_copy_sock_settings_to_clc(smc);
792 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
793 if (flags & O_NONBLOCK) {
794 if (smc->connect_info) {
798 smc->connect_info = kzalloc(alen + 2 * sizeof(int), GFP_KERNEL);
799 if (!smc->connect_info) {
803 smc->connect_info->alen = alen;
804 smc->connect_info->flags = flags ^ O_NONBLOCK;
805 memcpy(&smc->connect_info->addr, addr, alen);
806 schedule_work(&smc->connect_work);
809 rc = kernel_connect(smc->clcsock, addr, alen, flags);
813 rc = __smc_connect(smc);
817 rc = 0; /* success cases including fallback */
826 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
828 struct socket *new_clcsock = NULL;
829 struct sock *lsk = &lsmc->sk;
834 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
837 lsk->sk_err = ENOMEM;
842 *new_smc = smc_sk(new_sk);
844 mutex_lock(&lsmc->clcsock_release_lock);
846 rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0);
847 mutex_unlock(&lsmc->clcsock_release_lock);
851 if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
853 sock_release(new_clcsock);
854 new_sk->sk_state = SMC_CLOSED;
855 sock_set_flag(new_sk, SOCK_DEAD);
856 new_sk->sk_prot->unhash(new_sk);
857 sock_put(new_sk); /* final */
862 (*new_smc)->clcsock = new_clcsock;
867 /* add a just created sock to the accept queue of the listen sock as
868 * candidate for a following socket accept call from user space
870 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
872 struct smc_sock *par = smc_sk(parent);
874 sock_hold(sk); /* sock_put in smc_accept_unlink () */
875 spin_lock(&par->accept_q_lock);
876 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
877 spin_unlock(&par->accept_q_lock);
878 sk_acceptq_added(parent);
881 /* remove a socket from the accept queue of its parental listening socket */
882 static void smc_accept_unlink(struct sock *sk)
884 struct smc_sock *par = smc_sk(sk)->listen_smc;
886 spin_lock(&par->accept_q_lock);
887 list_del_init(&smc_sk(sk)->accept_q);
888 spin_unlock(&par->accept_q_lock);
889 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
890 sock_put(sk); /* sock_hold in smc_accept_enqueue */
893 /* remove a sock from the accept queue to bind it to a new socket created
894 * for a socket accept call from user space
896 struct sock *smc_accept_dequeue(struct sock *parent,
897 struct socket *new_sock)
899 struct smc_sock *isk, *n;
902 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
903 new_sk = (struct sock *)isk;
905 smc_accept_unlink(new_sk);
906 if (new_sk->sk_state == SMC_CLOSED) {
908 sock_release(isk->clcsock);
911 new_sk->sk_prot->unhash(new_sk);
912 sock_put(new_sk); /* final */
916 sock_graft(new_sk, new_sock);
922 /* clean up for a created but never accepted sock */
923 void smc_close_non_accepted(struct sock *sk)
925 struct smc_sock *smc = smc_sk(sk);
928 if (!sk->sk_lingertime)
929 /* wait for peer closing */
930 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
931 if (!smc->use_fallback) {
932 smc_close_active(smc);
933 sock_set_flag(sk, SOCK_DEAD);
934 sk->sk_shutdown |= SHUTDOWN_MASK;
943 if (smc->use_fallback) {
944 sock_put(sk); /* passive closing */
945 sk->sk_state = SMC_CLOSED;
947 if (sk->sk_state == SMC_CLOSED)
948 smc_conn_free(&smc->conn);
951 sk->sk_prot->unhash(sk);
952 sock_put(sk); /* final sock_put */
955 static int smc_serv_conf_first_link(struct smc_sock *smc)
957 struct net *net = sock_net(smc->clcsock->sk);
958 struct smc_link_group *lgr = smc->conn.lgr;
959 struct smc_link *link;
963 link = &lgr->lnk[SMC_SINGLE_LINK];
965 if (smc_reg_rmb(link, smc->conn.rmb_desc, false))
966 return SMC_CLC_DECL_ERR_REGRMB;
968 /* send CONFIRM LINK request to client over the RoCE fabric */
969 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
971 return SMC_CLC_DECL_TIMEOUT_CL;
973 /* receive CONFIRM LINK response from client over the RoCE fabric */
974 rest = wait_for_completion_interruptible_timeout(
975 &link->llc_confirm_resp,
976 SMC_LLC_WAIT_FIRST_TIME);
978 struct smc_clc_msg_decline dclc;
980 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
985 if (link->llc_confirm_resp_rc)
986 return SMC_CLC_DECL_RMBE_EC;
988 /* send ADD LINK request to client over the RoCE fabric */
989 rc = smc_llc_send_add_link(link,
990 link->smcibdev->mac[link->ibport - 1],
991 link->gid, SMC_LLC_REQ);
993 return SMC_CLC_DECL_TIMEOUT_AL;
995 /* receive ADD LINK response from client over the RoCE fabric */
996 rest = wait_for_completion_interruptible_timeout(&link->llc_add_resp,
999 struct smc_clc_msg_decline dclc;
1001 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1006 smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time);
1011 /* listen worker: finish */
1012 static void smc_listen_out(struct smc_sock *new_smc)
1014 struct smc_sock *lsmc = new_smc->listen_smc;
1015 struct sock *newsmcsk = &new_smc->sk;
1017 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
1018 if (lsmc->sk.sk_state == SMC_LISTEN) {
1019 smc_accept_enqueue(&lsmc->sk, newsmcsk);
1020 } else { /* no longer listening */
1021 smc_close_non_accepted(newsmcsk);
1023 release_sock(&lsmc->sk);
1025 /* Wake up accept */
1026 lsmc->sk.sk_data_ready(&lsmc->sk);
1027 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1030 /* listen worker: finish in state connected */
1031 static void smc_listen_out_connected(struct smc_sock *new_smc)
1033 struct sock *newsmcsk = &new_smc->sk;
1035 sk_refcnt_debug_inc(newsmcsk);
1036 if (newsmcsk->sk_state == SMC_INIT)
1037 newsmcsk->sk_state = SMC_ACTIVE;
1039 smc_listen_out(new_smc);
1042 /* listen worker: finish in error state */
1043 static void smc_listen_out_err(struct smc_sock *new_smc)
1045 struct sock *newsmcsk = &new_smc->sk;
1047 if (newsmcsk->sk_state == SMC_INIT)
1048 sock_put(&new_smc->sk); /* passive closing */
1049 newsmcsk->sk_state = SMC_CLOSED;
1050 smc_conn_free(&new_smc->conn);
1052 smc_listen_out(new_smc);
1055 /* listen worker: decline and fall back if possible */
1056 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
1059 /* RDMA setup failed, switch back to TCP */
1060 if (local_contact == SMC_FIRST_CONTACT)
1061 smc_lgr_forget(new_smc->conn.lgr);
1062 if (reason_code < 0) { /* error, no fallback possible */
1063 smc_listen_out_err(new_smc);
1066 smc_conn_free(&new_smc->conn);
1067 new_smc->use_fallback = true;
1068 new_smc->fallback_rsn = reason_code;
1069 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
1070 if (smc_clc_send_decline(new_smc, reason_code) < 0) {
1071 smc_listen_out_err(new_smc);
1075 smc_listen_out_connected(new_smc);
1078 /* listen worker: check prefixes */
1079 static int smc_listen_rdma_check(struct smc_sock *new_smc,
1080 struct smc_clc_msg_proposal *pclc)
1082 struct smc_clc_msg_proposal_prefix *pclc_prfx;
1083 struct socket *newclcsock = new_smc->clcsock;
1085 pclc_prfx = smc_clc_proposal_get_prefix(pclc);
1086 if (smc_clc_prfx_match(newclcsock, pclc_prfx))
1087 return SMC_CLC_DECL_CNFERR;
1092 /* listen worker: initialize connection and buffers */
1093 static int smc_listen_rdma_init(struct smc_sock *new_smc,
1094 struct smc_clc_msg_proposal *pclc,
1095 struct smc_ib_device *ibdev, u8 ibport,
1098 /* allocate connection / link group */
1099 *local_contact = smc_conn_create(new_smc, false, 0, ibdev, ibport, 0,
1100 &pclc->lcl, NULL, 0);
1101 if (*local_contact < 0) {
1102 if (*local_contact == -ENOMEM)
1103 return SMC_CLC_DECL_MEM;/* insufficient memory*/
1104 return SMC_CLC_DECL_INTERR; /* other error */
1107 /* create send buffer and rmb */
1108 if (smc_buf_create(new_smc, false))
1109 return SMC_CLC_DECL_MEM;
1114 /* listen worker: initialize connection and buffers for SMC-D */
1115 static int smc_listen_ism_init(struct smc_sock *new_smc,
1116 struct smc_clc_msg_proposal *pclc,
1117 struct smcd_dev *ismdev,
1120 struct smc_clc_msg_smcd *pclc_smcd;
1122 pclc_smcd = smc_get_clc_msg_smcd(pclc);
1123 *local_contact = smc_conn_create(new_smc, true, 0, NULL, 0, 0, NULL,
1124 ismdev, pclc_smcd->gid);
1125 if (*local_contact < 0) {
1126 if (*local_contact == -ENOMEM)
1127 return SMC_CLC_DECL_MEM;/* insufficient memory*/
1128 return SMC_CLC_DECL_INTERR; /* other error */
1131 /* Check if peer can be reached via ISM device */
1132 if (smc_ism_cantalk(new_smc->conn.lgr->peer_gid,
1133 new_smc->conn.lgr->vlan_id,
1134 new_smc->conn.lgr->smcd)) {
1135 if (*local_contact == SMC_FIRST_CONTACT)
1136 smc_lgr_forget(new_smc->conn.lgr);
1137 smc_conn_free(&new_smc->conn);
1138 return SMC_CLC_DECL_CNFERR;
1141 /* Create send and receive buffers */
1142 if (smc_buf_create(new_smc, true)) {
1143 if (*local_contact == SMC_FIRST_CONTACT)
1144 smc_lgr_forget(new_smc->conn.lgr);
1145 smc_conn_free(&new_smc->conn);
1146 return SMC_CLC_DECL_MEM;
1152 /* listen worker: register buffers */
1153 static int smc_listen_rdma_reg(struct smc_sock *new_smc, int local_contact)
1155 struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
1157 if (local_contact != SMC_FIRST_CONTACT) {
1158 if (!new_smc->conn.rmb_desc->reused) {
1159 if (smc_reg_rmb(link, new_smc->conn.rmb_desc, true))
1160 return SMC_CLC_DECL_ERR_REGRMB;
1163 smc_rmb_sync_sg_for_device(&new_smc->conn);
1168 /* listen worker: finish RDMA setup */
1169 static int smc_listen_rdma_finish(struct smc_sock *new_smc,
1170 struct smc_clc_msg_accept_confirm *cclc,
1173 struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
1174 int reason_code = 0;
1176 if (local_contact == SMC_FIRST_CONTACT)
1177 smc_link_save_peer_info(link, cclc);
1179 if (smc_rmb_rtoken_handling(&new_smc->conn, cclc)) {
1180 reason_code = SMC_CLC_DECL_ERR_RTOK;
1184 if (local_contact == SMC_FIRST_CONTACT) {
1185 if (smc_ib_ready_link(link)) {
1186 reason_code = SMC_CLC_DECL_ERR_RDYLNK;
1189 /* QP confirmation over RoCE fabric */
1190 reason_code = smc_serv_conf_first_link(new_smc);
1197 mutex_unlock(&smc_create_lgr_pending);
1198 smc_listen_decline(new_smc, reason_code, local_contact);
1202 /* setup for RDMA connection of server */
1203 static void smc_listen_work(struct work_struct *work)
1205 struct smc_sock *new_smc = container_of(work, struct smc_sock,
1207 struct socket *newclcsock = new_smc->clcsock;
1208 struct smc_clc_msg_accept_confirm cclc;
1209 struct smc_clc_msg_proposal *pclc;
1210 struct smc_ib_device *ibdev;
1211 bool ism_supported = false;
1212 struct smcd_dev *ismdev;
1213 u8 buf[SMC_CLC_MAX_LEN];
1214 int local_contact = 0;
1215 unsigned short vlan;
1216 int reason_code = 0;
1220 if (new_smc->use_fallback) {
1221 smc_listen_out_connected(new_smc);
1225 /* check if peer is smc capable */
1226 if (!tcp_sk(newclcsock->sk)->syn_smc) {
1227 new_smc->use_fallback = true;
1228 new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC;
1229 smc_listen_out_connected(new_smc);
1233 /* do inband token exchange -
1234 * wait for and receive SMC Proposal CLC message
1236 pclc = (struct smc_clc_msg_proposal *)&buf;
1237 reason_code = smc_clc_wait_msg(new_smc, pclc, SMC_CLC_MAX_LEN,
1240 smc_listen_decline(new_smc, reason_code, 0);
1244 /* IPSec connections opt out of SMC-R optimizations */
1245 if (using_ipsec(new_smc)) {
1246 smc_listen_decline(new_smc, SMC_CLC_DECL_IPSEC, 0);
1250 mutex_lock(&smc_create_lgr_pending);
1251 smc_close_init(new_smc);
1252 smc_rx_init(new_smc);
1253 smc_tx_init(new_smc);
1255 /* check if ISM is available */
1256 if ((pclc->hdr.path == SMC_TYPE_D || pclc->hdr.path == SMC_TYPE_B) &&
1257 !smc_check_ism(new_smc, &ismdev) &&
1258 !smc_listen_ism_init(new_smc, pclc, ismdev, &local_contact)) {
1259 ism_supported = true;
1262 /* check if RDMA is available */
1263 if (!ism_supported &&
1264 ((pclc->hdr.path != SMC_TYPE_R && pclc->hdr.path != SMC_TYPE_B) ||
1265 smc_vlan_by_tcpsk(new_smc->clcsock, &vlan) ||
1266 smc_check_rdma(new_smc, &ibdev, &ibport, vlan, NULL) ||
1267 smc_listen_rdma_check(new_smc, pclc) ||
1268 smc_listen_rdma_init(new_smc, pclc, ibdev, ibport,
1270 smc_listen_rdma_reg(new_smc, local_contact))) {
1271 /* SMC not supported, decline */
1272 mutex_unlock(&smc_create_lgr_pending);
1273 smc_listen_decline(new_smc, SMC_CLC_DECL_MODEUNSUPP,
1278 /* send SMC Accept CLC message */
1279 rc = smc_clc_send_accept(new_smc, local_contact);
1281 mutex_unlock(&smc_create_lgr_pending);
1282 smc_listen_decline(new_smc, rc, local_contact);
1286 /* receive SMC Confirm CLC message */
1287 reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
1290 mutex_unlock(&smc_create_lgr_pending);
1291 smc_listen_decline(new_smc, reason_code, local_contact);
1296 if (!ism_supported) {
1297 if (smc_listen_rdma_finish(new_smc, &cclc, local_contact))
1300 smc_conn_save_peer_info(new_smc, &cclc);
1301 mutex_unlock(&smc_create_lgr_pending);
1302 smc_listen_out_connected(new_smc);
1305 static void smc_tcp_listen_work(struct work_struct *work)
1307 struct smc_sock *lsmc = container_of(work, struct smc_sock,
1309 struct sock *lsk = &lsmc->sk;
1310 struct smc_sock *new_smc;
1314 while (lsk->sk_state == SMC_LISTEN) {
1315 rc = smc_clcsock_accept(lsmc, &new_smc);
1321 new_smc->listen_smc = lsmc;
1322 new_smc->use_fallback = lsmc->use_fallback;
1323 new_smc->fallback_rsn = lsmc->fallback_rsn;
1324 sock_hold(lsk); /* sock_put in smc_listen_work */
1325 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
1326 smc_copy_sock_settings_to_smc(new_smc);
1327 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf;
1328 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf;
1329 sock_hold(&new_smc->sk); /* sock_put in passive closing */
1330 if (!schedule_work(&new_smc->smc_listen_work))
1331 sock_put(&new_smc->sk);
1336 sock_put(&lsmc->sk); /* sock_hold in smc_listen */
1339 static int smc_listen(struct socket *sock, int backlog)
1341 struct sock *sk = sock->sk;
1342 struct smc_sock *smc;
1349 if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN))
1353 if (sk->sk_state == SMC_LISTEN) {
1354 sk->sk_max_ack_backlog = backlog;
1357 /* some socket options are handled in core, so we could not apply
1358 * them to the clc socket -- copy smc socket options to clc socket
1360 smc_copy_sock_settings_to_clc(smc);
1361 if (!smc->use_fallback)
1362 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1364 rc = kernel_listen(smc->clcsock, backlog);
1367 sk->sk_max_ack_backlog = backlog;
1368 sk->sk_ack_backlog = 0;
1369 sk->sk_state = SMC_LISTEN;
1370 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
1371 sock_hold(sk); /* sock_hold in tcp_listen_worker */
1372 if (!schedule_work(&smc->tcp_listen_work))
1380 static int smc_accept(struct socket *sock, struct socket *new_sock,
1381 int flags, bool kern)
1383 struct sock *sk = sock->sk, *nsk;
1384 DECLARE_WAITQUEUE(wait, current);
1385 struct smc_sock *lsmc;
1390 sock_hold(sk); /* sock_put below */
1393 if (lsmc->sk.sk_state != SMC_LISTEN) {
1399 /* Wait for an incoming connection */
1400 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1401 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1402 while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
1403 set_current_state(TASK_INTERRUPTIBLE);
1409 timeo = schedule_timeout(timeo);
1410 /* wakeup by sk_data_ready in smc_listen_work() */
1411 sched_annotate_sleep();
1413 if (signal_pending(current)) {
1414 rc = sock_intr_errno(timeo);
1418 set_current_state(TASK_RUNNING);
1419 remove_wait_queue(sk_sleep(sk), &wait);
1422 rc = sock_error(nsk);
1427 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
1428 /* wait till data arrives on the socket */
1429 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
1431 if (smc_sk(nsk)->use_fallback) {
1432 struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
1435 if (skb_queue_empty(&clcsk->sk_receive_queue))
1436 sk_wait_data(clcsk, &timeo, NULL);
1437 release_sock(clcsk);
1438 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
1440 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
1446 sock_put(sk); /* sock_hold above */
1450 static int smc_getname(struct socket *sock, struct sockaddr *addr,
1453 struct smc_sock *smc;
1455 if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
1456 (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
1459 smc = smc_sk(sock->sk);
1461 return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
1464 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1466 struct sock *sk = sock->sk;
1467 struct smc_sock *smc;
1472 if ((sk->sk_state != SMC_ACTIVE) &&
1473 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1474 (sk->sk_state != SMC_INIT))
1477 if (msg->msg_flags & MSG_FASTOPEN) {
1478 if (sk->sk_state == SMC_INIT) {
1479 smc->use_fallback = true;
1480 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
1487 if (smc->use_fallback)
1488 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
1490 rc = smc_tx_sendmsg(smc, msg, len);
1496 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1499 struct sock *sk = sock->sk;
1500 struct smc_sock *smc;
1505 if ((sk->sk_state == SMC_INIT) ||
1506 (sk->sk_state == SMC_LISTEN) ||
1507 (sk->sk_state == SMC_CLOSED))
1510 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1515 if (smc->use_fallback) {
1516 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
1518 msg->msg_namelen = 0;
1519 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
1527 static __poll_t smc_accept_poll(struct sock *parent)
1529 struct smc_sock *isk = smc_sk(parent);
1532 spin_lock(&isk->accept_q_lock);
1533 if (!list_empty(&isk->accept_q))
1534 mask = EPOLLIN | EPOLLRDNORM;
1535 spin_unlock(&isk->accept_q_lock);
1540 static __poll_t smc_poll(struct file *file, struct socket *sock,
1543 struct sock *sk = sock->sk;
1545 struct smc_sock *smc;
1550 smc = smc_sk(sock->sk);
1551 if (smc->use_fallback) {
1552 /* delegate to CLC child sock */
1553 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
1554 sk->sk_err = smc->clcsock->sk->sk_err;
1558 if (sk->sk_state != SMC_CLOSED)
1559 sock_poll_wait(file, sock, wait);
1562 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
1563 (sk->sk_state == SMC_CLOSED))
1565 if (sk->sk_state == SMC_LISTEN) {
1566 /* woken up by sk_data_ready in smc_listen_work() */
1567 mask = smc_accept_poll(sk);
1569 if (atomic_read(&smc->conn.sndbuf_space) ||
1570 sk->sk_shutdown & SEND_SHUTDOWN) {
1571 mask |= EPOLLOUT | EPOLLWRNORM;
1573 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1574 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1576 if (atomic_read(&smc->conn.bytes_to_rcv))
1577 mask |= EPOLLIN | EPOLLRDNORM;
1578 if (sk->sk_shutdown & RCV_SHUTDOWN)
1579 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
1580 if (sk->sk_state == SMC_APPCLOSEWAIT1)
1582 if (smc->conn.urg_state == SMC_URG_VALID)
1590 static int smc_shutdown(struct socket *sock, int how)
1592 struct sock *sk = sock->sk;
1593 struct smc_sock *smc;
1599 if ((how < SHUT_RD) || (how > SHUT_RDWR))
1605 if ((sk->sk_state != SMC_ACTIVE) &&
1606 (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
1607 (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
1608 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1609 (sk->sk_state != SMC_APPCLOSEWAIT2) &&
1610 (sk->sk_state != SMC_APPFINCLOSEWAIT))
1612 if (smc->use_fallback) {
1613 rc = kernel_sock_shutdown(smc->clcsock, how);
1614 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
1615 if (sk->sk_shutdown == SHUTDOWN_MASK)
1616 sk->sk_state = SMC_CLOSED;
1620 case SHUT_RDWR: /* shutdown in both directions */
1621 rc = smc_close_active(smc);
1624 rc = smc_close_shutdown_write(smc);
1628 /* nothing more to do because peer is not involved */
1632 rc1 = kernel_sock_shutdown(smc->clcsock, how);
1633 /* map sock_shutdown_cmd constants to sk_shutdown value range */
1634 sk->sk_shutdown |= how + 1;
1638 return rc ? rc : rc1;
1641 static int smc_setsockopt(struct socket *sock, int level, int optname,
1642 char __user *optval, unsigned int optlen)
1644 struct sock *sk = sock->sk;
1645 struct smc_sock *smc;
1650 /* generic setsockopts reaching us here always apply to the
1653 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
1655 if (smc->clcsock->sk->sk_err) {
1656 sk->sk_err = smc->clcsock->sk->sk_err;
1657 sk->sk_error_report(sk);
1662 if (optlen < sizeof(int))
1664 if (get_user(val, (int __user *)optval))
1671 case TCP_FASTOPEN_CONNECT:
1672 case TCP_FASTOPEN_KEY:
1673 case TCP_FASTOPEN_NO_COOKIE:
1674 /* option not supported by SMC */
1675 if (sk->sk_state == SMC_INIT) {
1676 smc->use_fallback = true;
1677 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
1679 if (!smc->use_fallback)
1684 if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) {
1685 if (val && !smc->use_fallback)
1686 mod_delayed_work(system_wq, &smc->conn.tx_work,
1691 if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) {
1692 if (!val && !smc->use_fallback)
1693 mod_delayed_work(system_wq, &smc->conn.tx_work,
1697 case TCP_DEFER_ACCEPT:
1698 smc->sockopt_defer_accept = val;
1708 static int smc_getsockopt(struct socket *sock, int level, int optname,
1709 char __user *optval, int __user *optlen)
1711 struct smc_sock *smc;
1713 smc = smc_sk(sock->sk);
1714 /* socket options apply to the CLC socket */
1715 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
1719 static int smc_ioctl(struct socket *sock, unsigned int cmd,
1722 union smc_host_cursor cons, urg;
1723 struct smc_connection *conn;
1724 struct smc_sock *smc;
1727 smc = smc_sk(sock->sk);
1729 lock_sock(&smc->sk);
1730 if (smc->use_fallback) {
1731 if (!smc->clcsock) {
1732 release_sock(&smc->sk);
1735 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
1736 release_sock(&smc->sk);
1740 case SIOCINQ: /* same as FIONREAD */
1741 if (smc->sk.sk_state == SMC_LISTEN) {
1742 release_sock(&smc->sk);
1745 if (smc->sk.sk_state == SMC_INIT ||
1746 smc->sk.sk_state == SMC_CLOSED)
1749 answ = atomic_read(&smc->conn.bytes_to_rcv);
1752 /* output queue size (not send + not acked) */
1753 if (smc->sk.sk_state == SMC_LISTEN) {
1754 release_sock(&smc->sk);
1757 if (smc->sk.sk_state == SMC_INIT ||
1758 smc->sk.sk_state == SMC_CLOSED)
1761 answ = smc->conn.sndbuf_desc->len -
1762 atomic_read(&smc->conn.sndbuf_space);
1765 /* output queue size (not send only) */
1766 if (smc->sk.sk_state == SMC_LISTEN) {
1767 release_sock(&smc->sk);
1770 if (smc->sk.sk_state == SMC_INIT ||
1771 smc->sk.sk_state == SMC_CLOSED)
1774 answ = smc_tx_prepared_sends(&smc->conn);
1777 if (smc->sk.sk_state == SMC_LISTEN) {
1778 release_sock(&smc->sk);
1781 if (smc->sk.sk_state == SMC_INIT ||
1782 smc->sk.sk_state == SMC_CLOSED) {
1785 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
1786 smc_curs_copy(&urg, &conn->urg_curs, conn);
1787 answ = smc_curs_diff(conn->rmb_desc->len,
1792 release_sock(&smc->sk);
1793 return -ENOIOCTLCMD;
1795 release_sock(&smc->sk);
1797 return put_user(answ, (int __user *)arg);
1800 static ssize_t smc_sendpage(struct socket *sock, struct page *page,
1801 int offset, size_t size, int flags)
1803 struct sock *sk = sock->sk;
1804 struct smc_sock *smc;
1809 if (sk->sk_state != SMC_ACTIVE) {
1814 if (smc->use_fallback)
1815 rc = kernel_sendpage(smc->clcsock, page, offset,
1818 rc = sock_no_sendpage(sock, page, offset, size, flags);
1824 /* Map the affected portions of the rmbe into an spd, note the number of bytes
1825 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
1826 * updates till whenever a respective page has been fully processed.
1827 * Note that subsequent recv() calls have to wait till all splice() processing
1830 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
1831 struct pipe_inode_info *pipe, size_t len,
1834 struct sock *sk = sock->sk;
1835 struct smc_sock *smc;
1841 if (sk->sk_state == SMC_INIT ||
1842 sk->sk_state == SMC_LISTEN ||
1843 sk->sk_state == SMC_CLOSED)
1846 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1851 if (smc->use_fallback) {
1852 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
1859 if (flags & SPLICE_F_NONBLOCK)
1860 flags = MSG_DONTWAIT;
1863 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
1871 /* must look like tcp */
1872 static const struct proto_ops smc_sock_ops = {
1874 .owner = THIS_MODULE,
1875 .release = smc_release,
1877 .connect = smc_connect,
1878 .socketpair = sock_no_socketpair,
1879 .accept = smc_accept,
1880 .getname = smc_getname,
1883 .listen = smc_listen,
1884 .shutdown = smc_shutdown,
1885 .setsockopt = smc_setsockopt,
1886 .getsockopt = smc_getsockopt,
1887 .sendmsg = smc_sendmsg,
1888 .recvmsg = smc_recvmsg,
1889 .mmap = sock_no_mmap,
1890 .sendpage = smc_sendpage,
1891 .splice_read = smc_splice_read,
1894 static int smc_create(struct net *net, struct socket *sock, int protocol,
1897 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
1898 struct smc_sock *smc;
1902 rc = -ESOCKTNOSUPPORT;
1903 if (sock->type != SOCK_STREAM)
1906 rc = -EPROTONOSUPPORT;
1907 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
1911 sock->ops = &smc_sock_ops;
1912 sk = smc_sock_alloc(net, sock, protocol);
1916 /* create internal TCP socket for CLC handshake and fallback */
1918 smc->use_fallback = false; /* assume rdma capability first */
1919 smc->fallback_rsn = 0;
1920 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
1923 sk_common_release(sk);
1926 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
1927 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
1933 static const struct net_proto_family smc_sock_family_ops = {
1935 .owner = THIS_MODULE,
1936 .create = smc_create,
1939 static int __init smc_init(void)
1943 rc = smc_pnet_init();
1947 rc = smc_llc_init();
1949 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
1953 rc = smc_cdc_init();
1955 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
1959 rc = proto_register(&smc_proto, 1);
1961 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
1965 rc = proto_register(&smc_proto6, 1);
1967 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
1971 rc = sock_register(&smc_sock_family_ops);
1973 pr_err("%s: sock_register fails with %d\n", __func__, rc);
1976 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
1977 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
1979 rc = smc_ib_register_client();
1981 pr_err("%s: ib_register fails with %d\n", __func__, rc);
1985 static_branch_enable(&tcp_have_smc);
1989 sock_unregister(PF_SMC);
1991 proto_unregister(&smc_proto6);
1993 proto_unregister(&smc_proto);
1999 static void __exit smc_exit(void)
2002 static_branch_disable(&tcp_have_smc);
2003 smc_ib_unregister_client();
2004 sock_unregister(PF_SMC);
2005 proto_unregister(&smc_proto6);
2006 proto_unregister(&smc_proto);
2010 module_init(smc_init);
2011 module_exit(smc_exit);
2013 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
2014 MODULE_DESCRIPTION("smc socket address family");
2015 MODULE_LICENSE("GPL");
2016 MODULE_ALIAS_NETPROTO(PF_SMC);