| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Ursula Braun-Krahl | 8316 | 46.26% | 80 | 27.68% |
| Karsten Graul | 3179 | 17.69% | 59 | 20.42% |
| Wen Gu | 1674 | 9.31% | 19 | 6.57% |
| Hans Wippel | 1337 | 7.44% | 14 | 4.84% |
| D. Wythe | 1234 | 6.87% | 17 | 5.88% |
| Tony Lu | 486 | 2.70% | 8 | 2.77% |
| Guangguan Wang | 468 | 2.60% | 10 | 3.46% |
| Guvenc Gulce | 385 | 2.14% | 5 | 1.73% |
| Stefan Raspl | 188 | 1.05% | 8 | 2.77% |
| Linus Torvalds (pre-git) | 120 | 0.67% | 11 | 3.81% |
| Dust Li | 87 | 0.48% | 6 | 2.08% |
| liu yacan | 62 | 0.34% | 5 | 1.73% |
| Gerd Bayer | 62 | 0.34% | 2 | 0.69% |
| Myungho Jung | 60 | 0.33% | 1 | 0.35% |
| Linus Torvalds | 45 | 0.25% | 4 | 1.38% |
| Christoph Hellwig | 41 | 0.23% | 2 | 0.69% |
| Thomas Richter | 39 | 0.22% | 1 | 0.35% |
| Eric Dumazet | 23 | 0.13% | 5 | 1.73% |
| Américo Wang | 21 | 0.12% | 2 | 0.69% |
| Pavel Emelyanov | 14 | 0.08% | 2 | 0.69% |
| Guo DaXing | 13 | 0.07% | 1 | 0.35% |
| Dmitry Antipov | 12 | 0.07% | 1 | 0.35% |
| Dan Carpenter | 12 | 0.07% | 1 | 0.35% |
| Yue haibing | 11 | 0.06% | 1 | 0.35% |
| Kuniyuki Iwashima | 11 | 0.06% | 1 | 0.35% |
| Eric W. Biedermann | 11 | 0.06% | 2 | 0.69% |
| Arnaldo Carvalho de Melo | 10 | 0.06% | 4 | 1.38% |
| Jens Axboe | 8 | 0.04% | 1 | 0.35% |
| Ingo Molnar | 8 | 0.04% | 2 | 0.69% |
| huangjie.albert | 8 | 0.04% | 1 | 0.35% |
| Chen Zhongjin | 6 | 0.03% | 1 | 0.35% |
| Jakub Kiciński | 5 | 0.03% | 2 | 0.69% |
| Chas Williams | 5 | 0.03% | 1 | 0.35% |
| Al Viro | 3 | 0.02% | 2 | 0.69% |
| James Morris | 2 | 0.01% | 1 | 0.35% |
| David S. Miller | 2 | 0.01% | 1 | 0.35% |
| Wei Yongjun | 2 | 0.01% | 1 | 0.35% |
| Paul E. McKenney | 2 | 0.01% | 1 | 0.35% |
| Thomas Gleixner | 1 | 0.01% | 1 | 0.35% |
| Rusty Russell | 1 | 0.01% | 1 | 0.35% |
| Deepa Dinamani | 1 | 0.01% | 1 | 0.35% |
| Total | 17975 | 289 |
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// SPDX-License-Identifier: GPL-2.0-only /* * Shared Memory Communications over RDMA (SMC-R) and RoCE * * AF_SMC protocol family socket handler keeping the AF_INET sock address type * applies to SOCK_STREAM sockets only * offers an alternative communication option for TCP-protocol sockets * applicable with RoCE-cards only * * Initial restrictions: * - support for alternate links postponed * * Copyright IBM Corp. 2016, 2018 * * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> * based on prototype from Frank Blaschka */ #define KMSG_COMPONENT "smc" #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt #include <linux/module.h> #include <linux/socket.h> #include <linux/workqueue.h> #include <linux/in.h> #include <linux/sched/signal.h> #include <linux/if_vlan.h> #include <linux/rcupdate_wait.h> #include <linux/ctype.h> #include <linux/splice.h> #include <net/sock.h> #include <net/tcp.h> #include <net/smc.h> #include <asm/ioctls.h> #include <net/net_namespace.h> #include <net/netns/generic.h> #include "smc_netns.h" #include "smc.h" #include "smc_clc.h" #include "smc_llc.h" #include "smc_cdc.h" #include "smc_core.h" #include "smc_ib.h" #include "smc_ism.h" #include "smc_pnet.h" #include "smc_netlink.h" #include "smc_tx.h" #include "smc_rx.h" #include "smc_close.h" #include "smc_stats.h" #include "smc_tracepoint.h" #include "smc_sysctl.h" #include "smc_loopback.h" #include "smc_inet.h" static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group * creation on server */ static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group * creation on client */ static struct workqueue_struct *smc_tcp_ls_wq; /* wq for tcp listen work */ struct workqueue_struct *smc_hs_wq; /* wq for handshake work */ struct workqueue_struct *smc_close_wq; /* wq for close work */ static void smc_tcp_listen_work(struct work_struct *); static void smc_connect_work(struct work_struct *); int smc_nl_dump_hs_limitation(struct sk_buff *skb, struct netlink_callback *cb) { struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); void *hdr; if (cb_ctx->pos[0]) goto out; hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, &smc_gen_nl_family, NLM_F_MULTI, SMC_NETLINK_DUMP_HS_LIMITATION); if (!hdr) return -ENOMEM; if (nla_put_u8(skb, SMC_NLA_HS_LIMITATION_ENABLED, sock_net(skb->sk)->smc.limit_smc_hs)) goto err; genlmsg_end(skb, hdr); cb_ctx->pos[0] = 1; out: return skb->len; err: genlmsg_cancel(skb, hdr); return -EMSGSIZE; } int smc_nl_enable_hs_limitation(struct sk_buff *skb, struct genl_info *info) { sock_net(skb->sk)->smc.limit_smc_hs = true; return 0; } int smc_nl_disable_hs_limitation(struct sk_buff *skb, struct genl_info *info) { sock_net(skb->sk)->smc.limit_smc_hs = false; return 0; } static void smc_set_keepalive(struct sock *sk, int val) { struct smc_sock *smc = smc_sk(sk); smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val); } static struct sock *smc_tcp_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, struct request_sock *req, struct dst_entry *dst, struct request_sock *req_unhash, bool *own_req) { struct smc_sock *smc; struct sock *child; smc = smc_clcsock_user_data(sk); if (READ_ONCE(sk->sk_ack_backlog) + atomic_read(&smc->queued_smc_hs) > sk->sk_max_ack_backlog) goto drop; if (sk_acceptq_is_full(&smc->sk)) { NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); goto drop; } /* passthrough to original syn recv sock fct */ child = smc->ori_af_ops->syn_recv_sock(sk, skb, req, dst, req_unhash, own_req); /* child must not inherit smc or its ops */ if (child) { rcu_assign_sk_user_data(child, NULL); /* v4-mapped sockets don't inherit parent ops. Don't restore. */ if (inet_csk(child)->icsk_af_ops == inet_csk(sk)->icsk_af_ops) inet_csk(child)->icsk_af_ops = smc->ori_af_ops; } return child; drop: dst_release(dst); tcp_listendrop(sk); return NULL; } static bool smc_hs_congested(const struct sock *sk) { const struct smc_sock *smc; smc = smc_clcsock_user_data(sk); if (!smc) return true; if (workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq)) return true; return false; } struct smc_hashinfo smc_v4_hashinfo = { .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock), }; struct smc_hashinfo smc_v6_hashinfo = { .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock), }; int smc_hash_sk(struct sock *sk) { struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; struct hlist_head *head; head = &h->ht; write_lock_bh(&h->lock); sk_add_node(sk, head); write_unlock_bh(&h->lock); sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); return 0; } void smc_unhash_sk(struct sock *sk) { struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; write_lock_bh(&h->lock); if (sk_del_node_init(sk)) sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); write_unlock_bh(&h->lock); } /* This will be called before user really release sock_lock. So do the * work which we didn't do because of user hold the sock_lock in the * BH context */ void smc_release_cb(struct sock *sk) { struct smc_sock *smc = smc_sk(sk); if (smc->conn.tx_in_release_sock) { smc_tx_pending(&smc->conn); smc->conn.tx_in_release_sock = false; } } struct proto smc_proto = { .name = "SMC", .owner = THIS_MODULE, .keepalive = smc_set_keepalive, .hash = smc_hash_sk, .unhash = smc_unhash_sk, .release_cb = smc_release_cb, .obj_size = sizeof(struct smc_sock), .h.smc_hash = &smc_v4_hashinfo, .slab_flags = SLAB_TYPESAFE_BY_RCU, }; EXPORT_SYMBOL_GPL(smc_proto); struct proto smc_proto6 = { .name = "SMC6", .owner = THIS_MODULE, .keepalive = smc_set_keepalive, .hash = smc_hash_sk, .unhash = smc_unhash_sk, .release_cb = smc_release_cb, .obj_size = sizeof(struct smc_sock), .h.smc_hash = &smc_v6_hashinfo, .slab_flags = SLAB_TYPESAFE_BY_RCU, }; EXPORT_SYMBOL_GPL(smc_proto6); static void smc_fback_restore_callbacks(struct smc_sock *smc) { struct sock *clcsk = smc->clcsock->sk; write_lock_bh(&clcsk->sk_callback_lock); clcsk->sk_user_data = NULL; smc_clcsock_restore_cb(&clcsk->sk_state_change, &smc->clcsk_state_change); smc_clcsock_restore_cb(&clcsk->sk_data_ready, &smc->clcsk_data_ready); smc_clcsock_restore_cb(&clcsk->sk_write_space, &smc->clcsk_write_space); smc_clcsock_restore_cb(&clcsk->sk_error_report, &smc->clcsk_error_report); write_unlock_bh(&clcsk->sk_callback_lock); } static void smc_restore_fallback_changes(struct smc_sock *smc) { if (smc->clcsock->file) { /* non-accepted sockets have no file yet */ smc->clcsock->file->private_data = smc->sk.sk_socket; smc->clcsock->file = NULL; smc_fback_restore_callbacks(smc); } } static int __smc_release(struct smc_sock *smc) { struct sock *sk = &smc->sk; int rc = 0; if (!smc->use_fallback) { rc = smc_close_active(smc); smc_sock_set_flag(sk, SOCK_DEAD); sk->sk_shutdown |= SHUTDOWN_MASK; } else { if (sk->sk_state != SMC_CLOSED) { if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT) sock_put(sk); /* passive closing */ if (sk->sk_state == SMC_LISTEN) { /* wake up clcsock accept */ rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR); } sk->sk_state = SMC_CLOSED; sk->sk_state_change(sk); } smc_restore_fallback_changes(smc); } sk->sk_prot->unhash(sk); if (sk->sk_state == SMC_CLOSED) { if (smc->clcsock) { release_sock(sk); smc_clcsock_release(smc); lock_sock(sk); } if (!smc->use_fallback) smc_conn_free(&smc->conn); } return rc; } int smc_release(struct socket *sock) { struct sock *sk = sock->sk; struct smc_sock *smc; int old_state, rc = 0; if (!sk) goto out; sock_hold(sk); /* sock_put below */ smc = smc_sk(sk); old_state = sk->sk_state; /* cleanup for a dangling non-blocking connect */ if (smc->connect_nonblock && old_state == SMC_INIT) tcp_abort(smc->clcsock->sk, ECONNABORTED); if (cancel_work_sync(&smc->connect_work)) sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */ if (sk->sk_state == SMC_LISTEN) /* smc_close_non_accepted() is called and acquires * sock lock for child sockets again */ lock_sock_nested(sk, SINGLE_DEPTH_NESTING); else lock_sock(sk); if (old_state == SMC_INIT && sk->sk_state == SMC_ACTIVE && !smc->use_fallback) smc_close_active_abort(smc); rc = __smc_release(smc); /* detach socket */ sock_orphan(sk); sock->sk = NULL; release_sock(sk); sock_put(sk); /* sock_hold above */ sock_put(sk); /* final sock_put */ out: return rc; } static void smc_destruct(struct sock *sk) { if (sk->sk_state != SMC_CLOSED) return; if (!sock_flag(sk, SOCK_DEAD)) return; } void smc_sk_init(struct net *net, struct sock *sk, int protocol) { struct smc_sock *smc = smc_sk(sk); sk->sk_state = SMC_INIT; sk->sk_destruct = smc_destruct; sk->sk_protocol = protocol; WRITE_ONCE(sk->sk_sndbuf, 2 * READ_ONCE(net->smc.sysctl_wmem)); WRITE_ONCE(sk->sk_rcvbuf, 2 * READ_ONCE(net->smc.sysctl_rmem)); INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); INIT_WORK(&smc->connect_work, smc_connect_work); INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work); INIT_LIST_HEAD(&smc->accept_q); spin_lock_init(&smc->accept_q_lock); spin_lock_init(&smc->conn.send_lock); sk->sk_prot->hash(sk); mutex_init(&smc->clcsock_release_lock); smc_init_saved_callbacks(smc); smc->limit_smc_hs = net->smc.limit_smc_hs; smc->use_fallback = false; /* assume rdma capability first */ smc->fallback_rsn = 0; smc_close_init(smc); } static struct sock *smc_sock_alloc(struct net *net, struct socket *sock, int protocol) { struct proto *prot; struct sock *sk; prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto; sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0); if (!sk) return NULL; sock_init_data(sock, sk); /* sets sk_refcnt to 1 */ smc_sk_init(net, sk, protocol); return sk; } int smc_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) { struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; struct sock *sk = sock->sk; struct smc_sock *smc; int rc; smc = smc_sk(sk); /* replicate tests from inet_bind(), to be safe wrt. future changes */ rc = -EINVAL; if (addr_len < sizeof(struct sockaddr_in)) goto out; rc = -EAFNOSUPPORT; if (addr->sin_family != AF_INET && addr->sin_family != AF_INET6 && addr->sin_family != AF_UNSPEC) goto out; /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */ if (addr->sin_family == AF_UNSPEC && addr->sin_addr.s_addr != htonl(INADDR_ANY)) goto out; lock_sock(sk); /* Check if socket is already active */ rc = -EINVAL; if (sk->sk_state != SMC_INIT || smc->connect_nonblock) goto out_rel; smc->clcsock->sk->sk_reuse = sk->sk_reuse; smc->clcsock->sk->sk_reuseport = sk->sk_reuseport; rc = kernel_bind(smc->clcsock, uaddr, addr_len); out_rel: release_sock(sk); out: return rc; } /* copy only relevant settings and flags of SOL_SOCKET level from smc to * clc socket (since smc is not called for these options from net/core) */ #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \ (1UL << SOCK_KEEPOPEN) | \ (1UL << SOCK_LINGER) | \ (1UL << SOCK_BROADCAST) | \ (1UL << SOCK_TIMESTAMP) | \ (1UL << SOCK_DBG) | \ (1UL << SOCK_RCVTSTAMP) | \ (1UL << SOCK_RCVTSTAMPNS) | \ (1UL << SOCK_LOCALROUTE) | \ (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ (1UL << SOCK_RXQ_OVFL) | \ (1UL << SOCK_WIFI_STATUS) | \ (1UL << SOCK_NOFCS) | \ (1UL << SOCK_FILTER_LOCKED) | \ (1UL << SOCK_TSTAMP_NEW)) /* if set, use value set by setsockopt() - else use IPv4 or SMC sysctl value */ static void smc_adjust_sock_bufsizes(struct sock *nsk, struct sock *osk, unsigned long mask) { nsk->sk_userlocks = osk->sk_userlocks; if (osk->sk_userlocks & SOCK_SNDBUF_LOCK) nsk->sk_sndbuf = osk->sk_sndbuf; if (osk->sk_userlocks & SOCK_RCVBUF_LOCK) nsk->sk_rcvbuf = osk->sk_rcvbuf; } static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk, unsigned long mask) { /* options we don't get control via setsockopt for */ nsk->sk_type = osk->sk_type; nsk->sk_sndtimeo = osk->sk_sndtimeo; nsk->sk_rcvtimeo = osk->sk_rcvtimeo; nsk->sk_mark = READ_ONCE(osk->sk_mark); nsk->sk_priority = READ_ONCE(osk->sk_priority); nsk->sk_rcvlowat = osk->sk_rcvlowat; nsk->sk_bound_dev_if = osk->sk_bound_dev_if; nsk->sk_err = osk->sk_err; nsk->sk_flags &= ~mask; nsk->sk_flags |= osk->sk_flags & mask; smc_adjust_sock_bufsizes(nsk, osk, mask); } static void smc_copy_sock_settings_to_clc(struct smc_sock *smc) { smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC); } #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \ (1UL << SOCK_KEEPOPEN) | \ (1UL << SOCK_LINGER) | \ (1UL << SOCK_DBG)) /* copy only settings and flags relevant for smc from clc to smc socket */ static void smc_copy_sock_settings_to_smc(struct smc_sock *smc) { smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC); } /* register the new vzalloced sndbuf on all links */ static int smcr_lgr_reg_sndbufs(struct smc_link *link, struct smc_buf_desc *snd_desc) { struct smc_link_group *lgr = link->lgr; int i, rc = 0; if (!snd_desc->is_vm) return -EINVAL; /* protect against parallel smcr_link_reg_buf() */ down_write(&lgr->llc_conf_mutex); for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { if (!smc_link_active(&lgr->lnk[i])) continue; rc = smcr_link_reg_buf(&lgr->lnk[i], snd_desc); if (rc) break; } up_write(&lgr->llc_conf_mutex); return rc; } /* register the new rmb on all links */ static int smcr_lgr_reg_rmbs(struct smc_link *link, struct smc_buf_desc *rmb_desc) { struct smc_link_group *lgr = link->lgr; bool do_slow = false; int i, rc = 0; rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY); if (rc) return rc; down_read(&lgr->llc_conf_mutex); for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { if (!smc_link_active(&lgr->lnk[i])) continue; if (!rmb_desc->is_reg_mr[link->link_idx]) { up_read(&lgr->llc_conf_mutex); goto slow_path; } } /* mr register already */ goto fast_path; slow_path: do_slow = true; /* protect against parallel smc_llc_cli_rkey_exchange() and * parallel smcr_link_reg_buf() */ down_write(&lgr->llc_conf_mutex); for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { if (!smc_link_active(&lgr->lnk[i])) continue; rc = smcr_link_reg_buf(&lgr->lnk[i], rmb_desc); if (rc) goto out; } fast_path: /* exchange confirm_rkey msg with peer */ rc = smc_llc_do_confirm_rkey(link, rmb_desc); if (rc) { rc = -EFAULT; goto out; } rmb_desc->is_conf_rkey = true; out: do_slow ? up_write(&lgr->llc_conf_mutex) : up_read(&lgr->llc_conf_mutex); smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); return rc; } static int smcr_clnt_conf_first_link(struct smc_sock *smc) { struct smc_link *link = smc->conn.lnk; struct smc_llc_qentry *qentry; int rc; /* Receive CONFIRM LINK request from server over RoCE fabric. * Increasing the client's timeout by twice as much as the server's * timeout by default can temporarily avoid decline messages of * both sides crossing or colliding */ qentry = smc_llc_wait(link->lgr, NULL, 2 * SMC_LLC_WAIT_TIME, SMC_LLC_CONFIRM_LINK); if (!qentry) { struct smc_clc_msg_decline dclc; rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; } smc_llc_save_peer_uid(qentry); rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ); smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); if (rc) return SMC_CLC_DECL_RMBE_EC; rc = smc_ib_modify_qp_rts(link); if (rc) return SMC_CLC_DECL_ERR_RDYLNK; smc_wr_remember_qp_attr(link); /* reg the sndbuf if it was vzalloced */ if (smc->conn.sndbuf_desc->is_vm) { if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc)) return SMC_CLC_DECL_ERR_REGBUF; } /* reg the rmb */ if (smcr_link_reg_buf(link, smc->conn.rmb_desc)) return SMC_CLC_DECL_ERR_REGBUF; /* confirm_rkey is implicit on 1st contact */ smc->conn.rmb_desc->is_conf_rkey = true; /* send CONFIRM LINK response over RoCE fabric */ rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP); if (rc < 0) return SMC_CLC_DECL_TIMEOUT_CL; smc_llc_link_active(link); smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); if (link->lgr->max_links > 1) { /* optional 2nd link, receive ADD LINK request from server */ qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME, SMC_LLC_ADD_LINK); if (!qentry) { struct smc_clc_msg_decline dclc; rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); if (rc == -EAGAIN) rc = 0; /* no DECLINE received, go with one link */ return rc; } smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl); smc_llc_cli_add_link(link, qentry); } return 0; } static bool smc_isascii(char *hostname) { int i; for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++) if (!isascii(hostname[i])) return false; return true; } static void smc_conn_save_peer_info_fce(struct smc_sock *smc, struct smc_clc_msg_accept_confirm *clc) { struct smc_clc_first_contact_ext *fce; int clc_v2_len; if (clc->hdr.version == SMC_V1 || !(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) return; if (smc->conn.lgr->is_smcd) { memcpy(smc->conn.lgr->negotiated_eid, clc->d1.eid, SMC_MAX_EID_LEN); clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm, d1); } else { memcpy(smc->conn.lgr->negotiated_eid, clc->r1.eid, SMC_MAX_EID_LEN); clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm, r1); } fce = (struct smc_clc_first_contact_ext *)(((u8 *)clc) + clc_v2_len); smc->conn.lgr->peer_os = fce->os_type; smc->conn.lgr->peer_smc_release = fce->release; if (smc_isascii(fce->hostname)) memcpy(smc->conn.lgr->peer_hostname, fce->hostname, SMC_MAX_HOSTNAME_LEN); } static void smcr_conn_save_peer_info(struct smc_sock *smc, struct smc_clc_msg_accept_confirm *clc) { int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size); smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx; smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token); smc->conn.peer_rmbe_size = bufsize; atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1); } static void smcd_conn_save_peer_info(struct smc_sock *smc, struct smc_clc_msg_accept_confirm *clc) { int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size); smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx; smc->conn.peer_token = ntohll(clc->d0.token); /* msg header takes up space in the buffer */ smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg); atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx; } static void smc_conn_save_peer_info(struct smc_sock *smc, struct smc_clc_msg_accept_confirm *clc) { if (smc->conn.lgr->is_smcd) smcd_conn_save_peer_info(smc, clc); else smcr_conn_save_peer_info(smc, clc); smc_conn_save_peer_info_fce(smc, clc); } static void smc_link_save_peer_info(struct smc_link *link, struct smc_clc_msg_accept_confirm *clc, struct smc_init_info *ini) { link->peer_qpn = ntoh24(clc->r0.qpn); memcpy(link->peer_gid, ini->peer_gid, SMC_GID_SIZE); memcpy(link->peer_mac, ini->peer_mac, sizeof(link->peer_mac)); link->peer_psn = ntoh24(clc->r0.psn); link->peer_mtu = clc->r0.qp_mtu; } static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc, struct smc_stats_fback *fback_arr) { int cnt; for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) { if (fback_arr[cnt].fback_code == smc->fallback_rsn) { fback_arr[cnt].count++; break; } if (!fback_arr[cnt].fback_code) { fback_arr[cnt].fback_code = smc->fallback_rsn; fback_arr[cnt].count++; break; } } } static void smc_stat_fallback(struct smc_sock *smc) { struct net *net = sock_net(&smc->sk); mutex_lock(&net->smc.mutex_fback_rsn); if (smc->listen_smc) { smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv); net->smc.fback_rsn->srv_fback_cnt++; } else { smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt); net->smc.fback_rsn->clnt_fback_cnt++; } mutex_unlock(&net->smc.mutex_fback_rsn); } /* must be called under rcu read lock */ static void smc_fback_wakeup_waitqueue(struct smc_sock *smc, void *key) { struct socket_wq *wq; __poll_t flags; wq = rcu_dereference(smc->sk.sk_wq); if (!skwq_has_sleeper(wq)) return; /* wake up smc sk->sk_wq */ if (!key) { /* sk_state_change */ wake_up_interruptible_all(&wq->wait); } else { flags = key_to_poll(key); if (flags & (EPOLLIN | EPOLLOUT)) /* sk_data_ready or sk_write_space */ wake_up_interruptible_sync_poll(&wq->wait, flags); else if (flags & EPOLLERR) /* sk_error_report */ wake_up_interruptible_poll(&wq->wait, flags); } } static int smc_fback_mark_woken(wait_queue_entry_t *wait, unsigned int mode, int sync, void *key) { struct smc_mark_woken *mark = container_of(wait, struct smc_mark_woken, wait_entry); mark->woken = true; mark->key = key; return 0; } static void smc_fback_forward_wakeup(struct smc_sock *smc, struct sock *clcsk, void (*clcsock_callback)(struct sock *sk)) { struct smc_mark_woken mark = { .woken = false }; struct socket_wq *wq; init_waitqueue_func_entry(&mark.wait_entry, smc_fback_mark_woken); rcu_read_lock(); wq = rcu_dereference(clcsk->sk_wq); if (!wq) goto out; add_wait_queue(sk_sleep(clcsk), &mark.wait_entry); clcsock_callback(clcsk); remove_wait_queue(sk_sleep(clcsk), &mark.wait_entry); if (mark.woken) smc_fback_wakeup_waitqueue(smc, mark.key); out: rcu_read_unlock(); } static void smc_fback_state_change(struct sock *clcsk) { struct smc_sock *smc; read_lock_bh(&clcsk->sk_callback_lock); smc = smc_clcsock_user_data(clcsk); if (smc) smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_state_change); read_unlock_bh(&clcsk->sk_callback_lock); } static void smc_fback_data_ready(struct sock *clcsk) { struct smc_sock *smc; read_lock_bh(&clcsk->sk_callback_lock); smc = smc_clcsock_user_data(clcsk); if (smc) smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_data_ready); read_unlock_bh(&clcsk->sk_callback_lock); } static void smc_fback_write_space(struct sock *clcsk) { struct smc_sock *smc; read_lock_bh(&clcsk->sk_callback_lock); smc = smc_clcsock_user_data(clcsk); if (smc) smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_write_space); read_unlock_bh(&clcsk->sk_callback_lock); } static void smc_fback_error_report(struct sock *clcsk) { struct smc_sock *smc; read_lock_bh(&clcsk->sk_callback_lock); smc = smc_clcsock_user_data(clcsk); if (smc) smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_error_report); read_unlock_bh(&clcsk->sk_callback_lock); } static void smc_fback_replace_callbacks(struct smc_sock *smc) { struct sock *clcsk = smc->clcsock->sk; write_lock_bh(&clcsk->sk_callback_lock); clcsk->sk_user_data = (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); smc_clcsock_replace_cb(&clcsk->sk_state_change, smc_fback_state_change, &smc->clcsk_state_change); smc_clcsock_replace_cb(&clcsk->sk_data_ready, smc_fback_data_ready, &smc->clcsk_data_ready); smc_clcsock_replace_cb(&clcsk->sk_write_space, smc_fback_write_space, &smc->clcsk_write_space); smc_clcsock_replace_cb(&clcsk->sk_error_report, smc_fback_error_report, &smc->clcsk_error_report); write_unlock_bh(&clcsk->sk_callback_lock); } static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code) { int rc = 0; mutex_lock(&smc->clcsock_release_lock); if (!smc->clcsock) { rc = -EBADF; goto out; } smc->use_fallback = true; smc->fallback_rsn = reason_code; smc_stat_fallback(smc); trace_smc_switch_to_fallback(smc, reason_code); if (smc->sk.sk_socket && smc->sk.sk_socket->file) { smc->clcsock->file = smc->sk.sk_socket->file; smc->clcsock->file->private_data = smc->clcsock; smc->clcsock->wq.fasync_list = smc->sk.sk_socket->wq.fasync_list; smc->sk.sk_socket->wq.fasync_list = NULL; /* There might be some wait entries remaining * in smc sk->sk_wq and they should be woken up * as clcsock's wait queue is woken up. */ smc_fback_replace_callbacks(smc); } out: mutex_unlock(&smc->clcsock_release_lock); return rc; } /* fall back during connect */ static int smc_connect_fallback(struct smc_sock *smc, int reason_code) { struct net *net = sock_net(&smc->sk); int rc = 0; rc = smc_switch_to_fallback(smc, reason_code); if (rc) { /* fallback fails */ this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); if (smc->sk.sk_state == SMC_INIT) sock_put(&smc->sk); /* passive closing */ return rc; } smc_copy_sock_settings_to_clc(smc); smc->connect_nonblock = 0; if (smc->sk.sk_state == SMC_INIT) smc->sk.sk_state = SMC_ACTIVE; return 0; } /* decline and fall back during connect */ static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code, u8 version) { struct net *net = sock_net(&smc->sk); int rc; if (reason_code < 0) { /* error, fallback is not possible */ this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); if (smc->sk.sk_state == SMC_INIT) sock_put(&smc->sk); /* passive closing */ return reason_code; } if (reason_code != SMC_CLC_DECL_PEERDECL) { rc = smc_clc_send_decline(smc, reason_code, version); if (rc < 0) { this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); if (smc->sk.sk_state == SMC_INIT) sock_put(&smc->sk); /* passive closing */ return rc; } } return smc_connect_fallback(smc, reason_code); } static void smc_conn_abort(struct smc_sock *smc, int local_first) { struct smc_connection *conn = &smc->conn; struct smc_link_group *lgr = conn->lgr; bool lgr_valid = false; if (smc_conn_lgr_valid(conn)) lgr_valid = true; smc_conn_free(conn); if (local_first && lgr_valid) smc_lgr_cleanup_early(lgr); } /* check if there is a rdma device available for this connection. */ /* called for connect and listen */ static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini) { /* PNET table look up: search active ib_device and port * within same PNETID that also contains the ethernet device * used for the internal TCP socket */ smc_pnet_find_roce_resource(smc->clcsock->sk, ini); if (!ini->check_smcrv2 && !ini->ib_dev) return SMC_CLC_DECL_NOSMCRDEV; if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2) return SMC_CLC_DECL_NOSMCRDEV; return 0; } /* check if there is an ISM device available for this connection. */ /* called for connect and listen */ static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini) { /* Find ISM device with same PNETID as connecting interface */ smc_pnet_find_ism_resource(smc->clcsock->sk, ini); if (!ini->ism_dev[0]) return SMC_CLC_DECL_NOSMCDDEV; else ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]); return 0; } /* is chid unique for the ism devices that are already determined? */ static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini, int cnt) { int i = (!ini->ism_dev[0]) ? 1 : 0; for (; i < cnt; i++) if (ini->ism_chid[i] == chid) return false; return true; } /* determine possible V2 ISM devices (either without PNETID or with PNETID plus * PNETID matching net_device) */ static int smc_find_ism_v2_device_clnt(struct smc_sock *smc, struct smc_init_info *ini) { int rc = SMC_CLC_DECL_NOSMCDDEV; struct smcd_dev *smcd; int i = 1, entry = 1; bool is_emulated; u16 chid; if (smcd_indicated(ini->smc_type_v1)) rc = 0; /* already initialized for V1 */ mutex_lock(&smcd_dev_list.mutex); list_for_each_entry(smcd, &smcd_dev_list.list, list) { if (smcd->going_away || smcd == ini->ism_dev[0]) continue; chid = smc_ism_get_chid(smcd); if (!smc_find_ism_v2_is_unique_chid(chid, ini, i)) continue; is_emulated = __smc_ism_is_emulated(chid); if (!smc_pnet_is_pnetid_set(smcd->pnetid) || smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) { if (is_emulated && entry == SMCD_CLC_MAX_V2_GID_ENTRIES) /* It's the last GID-CHID entry left in CLC * Proposal SMC-Dv2 extension, but an Emulated- * ISM device will take two entries. So give * up it and try the next potential ISM device. */ continue; ini->ism_dev[i] = smcd; ini->ism_chid[i] = chid; ini->is_smcd = true; rc = 0; i++; entry = is_emulated ? entry + 2 : entry + 1; if (entry > SMCD_CLC_MAX_V2_GID_ENTRIES) break; } } mutex_unlock(&smcd_dev_list.mutex); ini->ism_offered_cnt = i - 1; if (!ini->ism_dev[0] && !ini->ism_dev[1]) ini->smcd_version = 0; return rc; } /* Check for VLAN ID and register it on ISM device just for CLC handshake */ static int smc_connect_ism_vlan_setup(struct smc_sock *smc, struct smc_init_info *ini) { if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id)) return SMC_CLC_DECL_ISMVLANERR; return 0; } static int smc_find_proposal_devices(struct smc_sock *smc, struct smc_init_info *ini) { int rc = 0; /* check if there is an ism device available */ if (!(ini->smcd_version & SMC_V1) || smc_find_ism_device(smc, ini) || smc_connect_ism_vlan_setup(smc, ini)) ini->smcd_version &= ~SMC_V1; /* else ISM V1 is supported for this connection */ /* check if there is an rdma device available */ if (!(ini->smcr_version & SMC_V1) || smc_find_rdma_device(smc, ini)) ini->smcr_version &= ~SMC_V1; /* else RDMA is supported for this connection */ ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1, ini->smcr_version & SMC_V1); /* check if there is an ism v2 device available */ if (!(ini->smcd_version & SMC_V2) || !smc_ism_is_v2_capable() || smc_find_ism_v2_device_clnt(smc, ini)) ini->smcd_version &= ~SMC_V2; /* check if there is an rdma v2 device available */ ini->check_smcrv2 = true; ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr; if (!(ini->smcr_version & SMC_V2) || smc->clcsock->sk->sk_family != AF_INET || !smc_clc_ueid_count() || smc_find_rdma_device(smc, ini)) ini->smcr_version &= ~SMC_V2; ini->check_smcrv2 = false; ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2, ini->smcr_version & SMC_V2); /* if neither ISM nor RDMA are supported, fallback */ if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N) rc = SMC_CLC_DECL_NOSMCDEV; return rc; } /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is * used, the VLAN ID will be registered again during the connection setup. */ static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, struct smc_init_info *ini) { if (!smcd_indicated(ini->smc_type_v1)) return 0; if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id)) return SMC_CLC_DECL_CNFERR; return 0; } #define SMC_CLC_MAX_ACCEPT_LEN \ (sizeof(struct smc_clc_msg_accept_confirm) + \ sizeof(struct smc_clc_first_contact_ext_v2x) + \ sizeof(struct smc_clc_msg_trail)) /* CLC handshake during connect */ static int smc_connect_clc(struct smc_sock *smc, struct smc_clc_msg_accept_confirm *aclc, struct smc_init_info *ini) { int rc = 0; /* do inband token exchange */ rc = smc_clc_send_proposal(smc, ini); if (rc) return rc; /* receive SMC Accept CLC message */ return smc_clc_wait_msg(smc, aclc, SMC_CLC_MAX_ACCEPT_LEN, SMC_CLC_ACCEPT, CLC_WAIT_TIME); } void smc_fill_gid_list(struct smc_link_group *lgr, struct smc_gidlist *gidlist, struct smc_ib_device *known_dev, u8 *known_gid) { struct smc_init_info *alt_ini = NULL; memset(gidlist, 0, sizeof(*gidlist)); memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE); alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL); if (!alt_ini) goto out; alt_ini->vlan_id = lgr->vlan_id; alt_ini->check_smcrv2 = true; alt_ini->smcrv2.saddr = lgr->saddr; smc_pnet_find_alt_roce(lgr, alt_ini, known_dev); if (!alt_ini->smcrv2.ib_dev_v2) goto out; memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2, SMC_GID_SIZE); out: kfree(alt_ini); } static int smc_connect_rdma_v2_prepare(struct smc_sock *smc, struct smc_clc_msg_accept_confirm *aclc, struct smc_init_info *ini) { struct smc_clc_first_contact_ext *fce = smc_get_clc_first_contact_ext(aclc, false); struct net *net = sock_net(&smc->sk); int rc; if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1) return 0; if (fce->v2_direct) { memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN); ini->smcrv2.uses_gateway = false; } else { if (smc_ib_find_route(net, smc->clcsock->sk->sk_rcv_saddr, smc_ib_gid_to_ipv4(aclc->r0.lcl.gid), ini->smcrv2.nexthop_mac, &ini->smcrv2.uses_gateway)) return SMC_CLC_DECL_NOROUTE; if (!ini->smcrv2.uses_gateway) { /* mismatch: peer claims indirect, but its direct */ return SMC_CLC_DECL_NOINDIRECT; } } ini->release_nr = fce->release; rc = smc_clc_clnt_v2x_features_validate(fce, ini); if (rc) return rc; return 0; } /* setup for RDMA connection of client */ static int smc_connect_rdma(struct smc_sock *smc, struct smc_clc_msg_accept_confirm *aclc, struct smc_init_info *ini) { int i, reason_code = 0; struct smc_link *link; u8 *eid = NULL; ini->is_smcd = false; ini->ib_clcqpn = ntoh24(aclc->r0.qpn); ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN); memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE); memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN); ini->max_conns = SMC_CONN_PER_LGR_MAX; ini->max_links = SMC_LINKS_ADD_LNK_MAX; reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini); if (reason_code) return reason_code; mutex_lock(&smc_client_lgr_pending); reason_code = smc_conn_create(smc, ini); if (reason_code) { mutex_unlock(&smc_client_lgr_pending); return reason_code; } smc_conn_save_peer_info(smc, aclc); if (ini->first_contact_local) { link = smc->conn.lnk; } else { /* set link that was assigned by server */ link = NULL; for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { struct smc_link *l = &smc->conn.lgr->lnk[i]; if (l->peer_qpn == ntoh24(aclc->r0.qpn) && !memcmp(l->peer_gid, &aclc->r0.lcl.gid, SMC_GID_SIZE) && (aclc->hdr.version > SMC_V1 || !memcmp(l->peer_mac, &aclc->r0.lcl.mac, sizeof(l->peer_mac)))) { link = l; break; } } if (!link) { reason_code = SMC_CLC_DECL_NOSRVLINK; goto connect_abort; } smc_switch_link_and_count(&smc->conn, link); } /* create send buffer and rmb */ if (smc_buf_create(smc, false)) { reason_code = SMC_CLC_DECL_MEM; goto connect_abort; } if (ini->first_contact_local) smc_link_save_peer_info(link, aclc, ini); if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) { reason_code = SMC_CLC_DECL_ERR_RTOK; goto connect_abort; } smc_rx_init(smc); if (ini->first_contact_local) { if (smc_ib_ready_link(link)) { reason_code = SMC_CLC_DECL_ERR_RDYLNK; goto connect_abort; } } else { /* reg sendbufs if they were vzalloced */ if (smc->conn.sndbuf_desc->is_vm) { if (smcr_lgr_reg_sndbufs(link, smc->conn.sndbuf_desc)) { reason_code = SMC_CLC_DECL_ERR_REGBUF; goto connect_abort; } } if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) { reason_code = SMC_CLC_DECL_ERR_REGBUF; goto connect_abort; } } if (aclc->hdr.version > SMC_V1) { eid = aclc->r1.eid; if (ini->first_contact_local) smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist, link->smcibdev, link->gid); } reason_code = smc_clc_send_confirm(smc, ini->first_contact_local, aclc->hdr.version, eid, ini); if (reason_code) goto connect_abort; smc_tx_init(smc); if (ini->first_contact_local) { /* QP confirmation over RoCE fabric */ smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); reason_code = smcr_clnt_conf_first_link(smc); smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); if (reason_code) goto connect_abort; } mutex_unlock(&smc_client_lgr_pending); smc_copy_sock_settings_to_clc(smc); smc->connect_nonblock = 0; if (smc->sk.sk_state == SMC_INIT) smc->sk.sk_state = SMC_ACTIVE; return 0; connect_abort: smc_conn_abort(smc, ini->first_contact_local); mutex_unlock(&smc_client_lgr_pending); smc->connect_nonblock = 0; return reason_code; } /* The server has chosen one of the proposed ISM devices for the communication. * Determine from the CHID of the received CLC ACCEPT the ISM device chosen. */ static int smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm *aclc, struct smc_init_info *ini) { int i; for (i = 0; i < ini->ism_offered_cnt + 1; i++) { if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) { ini->ism_selected = i; return 0; } } return -EPROTO; } /* setup for ISM connection of client */ static int smc_connect_ism(struct smc_sock *smc, struct smc_clc_msg_accept_confirm *aclc, struct smc_init_info *ini) { u8 *eid = NULL; int rc = 0; ini->is_smcd = true; ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; if (aclc->hdr.version == SMC_V2) { if (ini->first_contact_peer) { struct smc_clc_first_contact_ext *fce = smc_get_clc_first_contact_ext(aclc, true); ini->release_nr = fce->release; rc = smc_clc_clnt_v2x_features_validate(fce, ini); if (rc) return rc; } rc = smc_v2_determine_accepted_chid(aclc, ini); if (rc) return rc; if (__smc_ism_is_emulated(ini->ism_chid[ini->ism_selected])) ini->ism_peer_gid[ini->ism_selected].gid_ext = ntohll(aclc->d1.gid_ext); /* for non-Emulated-ISM devices, peer gid_ext remains 0. */ } ini->ism_peer_gid[ini->ism_selected].gid = ntohll(aclc->d0.gid); /* there is only one lgr role for SMC-D; use server lock */ mutex_lock(&smc_server_lgr_pending); rc = smc_conn_create(smc, ini); if (rc) { mutex_unlock(&smc_server_lgr_pending); return rc; } /* Create send and receive buffers */ rc = smc_buf_create(smc, true); if (rc) { rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM; goto connect_abort; } smc_conn_save_peer_info(smc, aclc); if (smc_ism_support_dmb_nocopy(smc->conn.lgr->smcd)) { rc = smcd_buf_attach(smc); if (rc) { rc = SMC_CLC_DECL_MEM; /* try to fallback */ goto connect_abort; } } smc_rx_init(smc); smc_tx_init(smc); if (aclc->hdr.version > SMC_V1) eid = aclc->d1.eid; rc = smc_clc_send_confirm(smc, ini->first_contact_local, aclc->hdr.version, eid, ini); if (rc) goto connect_abort; mutex_unlock(&smc_server_lgr_pending); smc_copy_sock_settings_to_clc(smc); smc->connect_nonblock = 0; if (smc->sk.sk_state == SMC_INIT) smc->sk.sk_state = SMC_ACTIVE; return 0; connect_abort: smc_conn_abort(smc, ini->first_contact_local); mutex_unlock(&smc_server_lgr_pending); smc->connect_nonblock = 0; return rc; } /* check if received accept type and version matches a proposed one */ static int smc_connect_check_aclc(struct smc_init_info *ini, struct smc_clc_msg_accept_confirm *aclc) { if (aclc->hdr.version >= SMC_V2) { if ((aclc->hdr.typev1 == SMC_TYPE_R && !smcr_indicated(ini->smc_type_v2)) || (aclc->hdr.typev1 == SMC_TYPE_D && !smcd_indicated(ini->smc_type_v2))) return SMC_CLC_DECL_MODEUNSUPP; } else { if ((aclc->hdr.typev1 == SMC_TYPE_R && !smcr_indicated(ini->smc_type_v1)) || (aclc->hdr.typev1 == SMC_TYPE_D && !smcd_indicated(ini->smc_type_v1))) return SMC_CLC_DECL_MODEUNSUPP; } return 0; } /* perform steps before actually connecting */ static int __smc_connect(struct smc_sock *smc) { u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1; struct smc_clc_msg_accept_confirm *aclc; struct smc_init_info *ini = NULL; u8 *buf = NULL; int rc = 0; if (smc->use_fallback) return smc_connect_fallback(smc, smc->fallback_rsn); /* if peer has not signalled SMC-capability, fall back */ if (!tcp_sk(smc->clcsock->sk)->syn_smc) return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC); /* IPSec connections opt out of SMC optimizations */ if (using_ipsec(smc)) return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC, version); ini = kzalloc(sizeof(*ini), GFP_KERNEL); if (!ini) return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM, version); ini->smcd_version = SMC_V1 | SMC_V2; ini->smcr_version = SMC_V1 | SMC_V2; ini->smc_type_v1 = SMC_TYPE_B; ini->smc_type_v2 = SMC_TYPE_B; /* get vlan id from IP device */ if (smc_vlan_by_tcpsk(smc->clcsock, ini)) { ini->smcd_version &= ~SMC_V1; ini->smcr_version = 0; ini->smc_type_v1 = SMC_TYPE_N; } rc = smc_find_proposal_devices(smc, ini); if (rc) goto fallback; buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL); if (!buf) { rc = SMC_CLC_DECL_MEM; goto fallback; } aclc = (struct smc_clc_msg_accept_confirm *)buf; /* perform CLC handshake */ rc = smc_connect_clc(smc, aclc, ini); if (rc) { /* -EAGAIN on timeout, see tcp_recvmsg() */ if (rc == -EAGAIN) { rc = -ETIMEDOUT; smc->sk.sk_err = ETIMEDOUT; } goto vlan_cleanup; } /* check if smc modes and versions of CLC proposal and accept match */ rc = smc_connect_check_aclc(ini, aclc); version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2; if (rc) goto vlan_cleanup; /* depending on previous steps, connect using rdma or ism */ if (aclc->hdr.typev1 == SMC_TYPE_R) { ini->smcr_version = version; rc = smc_connect_rdma(smc, aclc, ini); } else if (aclc->hdr.typev1 == SMC_TYPE_D) { ini->smcd_version = version; rc = smc_connect_ism(smc, aclc, ini); } if (rc) goto vlan_cleanup; SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc); smc_connect_ism_vlan_cleanup(smc, ini); kfree(buf); kfree(ini); return 0; vlan_cleanup: smc_connect_ism_vlan_cleanup(smc, ini); kfree(buf); fallback: kfree(ini); return smc_connect_decline_fallback(smc, rc, version); } static void smc_connect_work(struct work_struct *work) { struct smc_sock *smc = container_of(work, struct smc_sock, connect_work); long timeo = smc->sk.sk_sndtimeo; int rc = 0; if (!timeo) timeo = MAX_SCHEDULE_TIMEOUT; lock_sock(smc->clcsock->sk); if (smc->clcsock->sk->sk_err) { smc->sk.sk_err = smc->clcsock->sk->sk_err; } else if ((1 << smc->clcsock->sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo); if ((rc == -EPIPE) && ((1 << smc->clcsock->sk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))) rc = 0; } release_sock(smc->clcsock->sk); lock_sock(&smc->sk); if (rc != 0 || smc->sk.sk_err) { smc->sk.sk_state = SMC_CLOSED; if (rc == -EPIPE || rc == -EAGAIN) smc->sk.sk_err = EPIPE; else if (rc == -ECONNREFUSED) smc->sk.sk_err = ECONNREFUSED; else if (signal_pending(current)) smc->sk.sk_err = -sock_intr_errno(timeo); sock_put(&smc->sk); /* passive closing */ goto out; } rc = __smc_connect(smc); if (rc < 0) smc->sk.sk_err = -rc; out: if (!sock_flag(&smc->sk, SOCK_DEAD)) { if (smc->sk.sk_err) { smc->sk.sk_state_change(&smc->sk); } else { /* allow polling before and after fallback decision */ smc->clcsock->sk->sk_write_space(smc->clcsock->sk); smc->sk.sk_write_space(&smc->sk); } } release_sock(&smc->sk); } int smc_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) { struct sock *sk = sock->sk; struct smc_sock *smc; int rc = -EINVAL; smc = smc_sk(sk); /* separate smc parameter checking to be safe */ if (alen < sizeof(addr->sa_family)) goto out_err; if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) goto out_err; lock_sock(sk); switch (sock->state) { default: rc = -EINVAL; goto out; case SS_CONNECTED: rc = sk->sk_state == SMC_ACTIVE ? -EISCONN : -EINVAL; goto out; case SS_CONNECTING: if (sk->sk_state == SMC_ACTIVE) goto connected; break; case SS_UNCONNECTED: sock->state = SS_CONNECTING; break; } switch (sk->sk_state) { default: goto out; case SMC_CLOSED: rc = sock_error(sk) ? : -ECONNABORTED; sock->state = SS_UNCONNECTED; goto out; case SMC_ACTIVE: rc = -EISCONN; goto out; case SMC_INIT: break; } smc_copy_sock_settings_to_clc(smc); tcp_sk(smc->clcsock->sk)->syn_smc = 1; if (smc->connect_nonblock) { rc = -EALREADY; goto out; } rc = kernel_connect(smc->clcsock, addr, alen, flags); if (rc && rc != -EINPROGRESS) goto out; if (smc->use_fallback) { sock->state = rc ? SS_CONNECTING : SS_CONNECTED; goto out; } sock_hold(&smc->sk); /* sock put in passive closing */ if (flags & O_NONBLOCK) { if (queue_work(smc_hs_wq, &smc->connect_work)) smc->connect_nonblock = 1; rc = -EINPROGRESS; goto out; } else { rc = __smc_connect(smc); if (rc < 0) goto out; } connected: rc = 0; sock->state = SS_CONNECTED; out: release_sock(sk); out_err: return rc; } static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) { struct socket *new_clcsock = NULL; struct sock *lsk = &lsmc->sk; struct sock *new_sk; int rc = -EINVAL; release_sock(lsk); new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); if (!new_sk) { rc = -ENOMEM; lsk->sk_err = ENOMEM; *new_smc = NULL; lock_sock(lsk); goto out; } *new_smc = smc_sk(new_sk); mutex_lock(&lsmc->clcsock_release_lock); if (lsmc->clcsock) rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK); mutex_unlock(&lsmc->clcsock_release_lock); lock_sock(lsk); if (rc < 0 && rc != -EAGAIN) lsk->sk_err = -rc; if (rc < 0 || lsk->sk_state == SMC_CLOSED) { new_sk->sk_prot->unhash(new_sk); if (new_clcsock) sock_release(new_clcsock); new_sk->sk_state = SMC_CLOSED; smc_sock_set_flag(new_sk, SOCK_DEAD); sock_put(new_sk); /* final */ *new_smc = NULL; goto out; } /* new clcsock has inherited the smc listen-specific sk_data_ready * function; switch it back to the original sk_data_ready function */ new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready; /* if new clcsock has also inherited the fallback-specific callback * functions, switch them back to the original ones. */ if (lsmc->use_fallback) { if (lsmc->clcsk_state_change) new_clcsock->sk->sk_state_change = lsmc->clcsk_state_change; if (lsmc->clcsk_write_space) new_clcsock->sk->sk_write_space = lsmc->clcsk_write_space; if (lsmc->clcsk_error_report) new_clcsock->sk->sk_error_report = lsmc->clcsk_error_report; } (*new_smc)->clcsock = new_clcsock; out: return rc; } /* add a just created sock to the accept queue of the listen sock as * candidate for a following socket accept call from user space */ static void smc_accept_enqueue(struct sock *parent, struct sock *sk) { struct smc_sock *par = smc_sk(parent); sock_hold(sk); /* sock_put in smc_accept_unlink () */ spin_lock(&par->accept_q_lock); list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); spin_unlock(&par->accept_q_lock); sk_acceptq_added(parent); } /* remove a socket from the accept queue of its parental listening socket */ static void smc_accept_unlink(struct sock *sk) { struct smc_sock *par = smc_sk(sk)->listen_smc; spin_lock(&par->accept_q_lock); list_del_init(&smc_sk(sk)->accept_q); spin_unlock(&par->accept_q_lock); sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); sock_put(sk); /* sock_hold in smc_accept_enqueue */ } /* remove a sock from the accept queue to bind it to a new socket created * for a socket accept call from user space */ struct sock *smc_accept_dequeue(struct sock *parent, struct socket *new_sock) { struct smc_sock *isk, *n; struct sock *new_sk; list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { new_sk = (struct sock *)isk; smc_accept_unlink(new_sk); if (new_sk->sk_state == SMC_CLOSED) { new_sk->sk_prot->unhash(new_sk); if (isk->clcsock) { sock_release(isk->clcsock); isk->clcsock = NULL; } sock_put(new_sk); /* final */ continue; } if (new_sock) { sock_graft(new_sk, new_sock); new_sock->state = SS_CONNECTED; if (isk->use_fallback) { smc_sk(new_sk)->clcsock->file = new_sock->file; isk->clcsock->file->private_data = isk->clcsock; } } return new_sk; } return NULL; } /* clean up for a created but never accepted sock */ void smc_close_non_accepted(struct sock *sk) { struct smc_sock *smc = smc_sk(sk); sock_hold(sk); /* sock_put below */ lock_sock(sk); if (!sk->sk_lingertime) /* wait for peer closing */ WRITE_ONCE(sk->sk_lingertime, SMC_MAX_STREAM_WAIT_TIMEOUT); __smc_release(smc); release_sock(sk); sock_put(sk); /* sock_hold above */ sock_put(sk); /* final sock_put */ } static int smcr_serv_conf_first_link(struct smc_sock *smc) { struct smc_link *link = smc->conn.lnk; struct smc_llc_qentry *qentry; int rc; /* reg the sndbuf if it was vzalloced*/ if (smc->conn.sndbuf_desc->is_vm) { if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc)) return SMC_CLC_DECL_ERR_REGBUF; } /* reg the rmb */ if (smcr_link_reg_buf(link, smc->conn.rmb_desc)) return SMC_CLC_DECL_ERR_REGBUF; /* send CONFIRM LINK request to client over the RoCE fabric */ rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ); if (rc < 0) return SMC_CLC_DECL_TIMEOUT_CL; /* receive CONFIRM LINK response from client over the RoCE fabric */ qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME, SMC_LLC_CONFIRM_LINK); if (!qentry) { struct smc_clc_msg_decline dclc; rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; } smc_llc_save_peer_uid(qentry); rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP); smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); if (rc) return SMC_CLC_DECL_RMBE_EC; /* confirm_rkey is implicit on 1st contact */ smc->conn.rmb_desc->is_conf_rkey = true; smc_llc_link_active(link); smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); if (link->lgr->max_links > 1) { down_write(&link->lgr->llc_conf_mutex); /* initial contact - try to establish second link */ smc_llc_srv_add_link(link, NULL); up_write(&link->lgr->llc_conf_mutex); } return 0; } /* listen worker: finish */ static void smc_listen_out(struct smc_sock *new_smc) { struct smc_sock *lsmc = new_smc->listen_smc; struct sock *newsmcsk = &new_smc->sk; if (tcp_sk(new_smc->clcsock->sk)->syn_smc) atomic_dec(&lsmc->queued_smc_hs); release_sock(newsmcsk); /* lock in smc_listen_work() */ if (lsmc->sk.sk_state == SMC_LISTEN) { lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); smc_accept_enqueue(&lsmc->sk, newsmcsk); release_sock(&lsmc->sk); } else { /* no longer listening */ smc_close_non_accepted(newsmcsk); } /* Wake up accept */ lsmc->sk.sk_data_ready(&lsmc->sk); sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ } /* listen worker: finish in state connected */ static void smc_listen_out_connected(struct smc_sock *new_smc) { struct sock *newsmcsk = &new_smc->sk; if (newsmcsk->sk_state == SMC_INIT) newsmcsk->sk_state = SMC_ACTIVE; smc_listen_out(new_smc); } /* listen worker: finish in error state */ static void smc_listen_out_err(struct smc_sock *new_smc) { struct sock *newsmcsk = &new_smc->sk; struct net *net = sock_net(newsmcsk); this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt); if (newsmcsk->sk_state == SMC_INIT) sock_put(&new_smc->sk); /* passive closing */ newsmcsk->sk_state = SMC_CLOSED; smc_listen_out(new_smc); } /* listen worker: decline and fall back if possible */ static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, int local_first, u8 version) { /* RDMA setup failed, switch back to TCP */ smc_conn_abort(new_smc, local_first); if (reason_code < 0 || smc_switch_to_fallback(new_smc, reason_code)) { /* error, no fallback possible */ smc_listen_out_err(new_smc); return; } if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { if (smc_clc_send_decline(new_smc, reason_code, version) < 0) { smc_listen_out_err(new_smc); return; } } smc_listen_out_connected(new_smc); } /* listen worker: version checking */ static int smc_listen_v2_check(struct smc_sock *new_smc, struct smc_clc_msg_proposal *pclc, struct smc_init_info *ini) { struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext; struct smc_clc_v2_extension *pclc_v2_ext; int rc = SMC_CLC_DECL_PEERNOSMC; ini->smc_type_v1 = pclc->hdr.typev1; ini->smc_type_v2 = pclc->hdr.typev2; ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0; ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0; if (pclc->hdr.version > SMC_V1) { if (smcd_indicated(ini->smc_type_v2)) ini->smcd_version |= SMC_V2; if (smcr_indicated(ini->smc_type_v2)) ini->smcr_version |= SMC_V2; } if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) { rc = SMC_CLC_DECL_PEERNOSMC; goto out; } pclc_v2_ext = smc_get_clc_v2_ext(pclc); if (!pclc_v2_ext) { ini->smcd_version &= ~SMC_V2; ini->smcr_version &= ~SMC_V2; rc = SMC_CLC_DECL_NOV2EXT; goto out; } pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext); if (ini->smcd_version & SMC_V2) { if (!smc_ism_is_v2_capable()) { ini->smcd_version &= ~SMC_V2; rc = SMC_CLC_DECL_NOISM2SUPP; } else if (!pclc_smcd_v2_ext) { ini->smcd_version &= ~SMC_V2; rc = SMC_CLC_DECL_NOV2DEXT; } else if (!pclc_v2_ext->hdr.eid_cnt && !pclc_v2_ext->hdr.flag.seid) { ini->smcd_version &= ~SMC_V2; rc = SMC_CLC_DECL_NOUEID; } } if (ini->smcr_version & SMC_V2) { if (!pclc_v2_ext->hdr.eid_cnt) { ini->smcr_version &= ~SMC_V2; rc = SMC_CLC_DECL_NOUEID; } } ini->release_nr = pclc_v2_ext->hdr.flag.release; if (pclc_v2_ext->hdr.flag.release > SMC_RELEASE) ini->release_nr = SMC_RELEASE; out: if (!ini->smcd_version && !ini->smcr_version) return rc; return 0; } /* listen worker: check prefixes */ static int smc_listen_prfx_check(struct smc_sock *new_smc, struct smc_clc_msg_proposal *pclc) { struct smc_clc_msg_proposal_prefix *pclc_prfx; struct socket *newclcsock = new_smc->clcsock; if (pclc->hdr.typev1 == SMC_TYPE_N) return 0; pclc_prfx = smc_clc_proposal_get_prefix(pclc); if (!pclc_prfx) return -EPROTO; if (smc_clc_prfx_match(newclcsock, pclc_prfx)) return SMC_CLC_DECL_DIFFPREFIX; return 0; } /* listen worker: initialize connection and buffers */ static int smc_listen_rdma_init(struct smc_sock *new_smc, struct smc_init_info *ini) { int rc; /* allocate connection / link group */ rc = smc_conn_create(new_smc, ini); if (rc) return rc; /* create send buffer and rmb */ if (smc_buf_create(new_smc, false)) { smc_conn_abort(new_smc, ini->first_contact_local); return SMC_CLC_DECL_MEM; } return 0; } /* listen worker: initialize connection and buffers for SMC-D */ static int smc_listen_ism_init(struct smc_sock *new_smc, struct smc_init_info *ini) { int rc; rc = smc_conn_create(new_smc, ini); if (rc) return rc; /* Create send and receive buffers */ rc = smc_buf_create(new_smc, true); if (rc) { smc_conn_abort(new_smc, ini->first_contact_local); return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM; } return 0; } static bool smc_is_already_selected(struct smcd_dev *smcd, struct smc_init_info *ini, int matches) { int i; for (i = 0; i < matches; i++) if (smcd == ini->ism_dev[i]) return true; return false; } /* check for ISM devices matching proposed ISM devices */ static void smc_check_ism_v2_match(struct smc_init_info *ini, u16 proposed_chid, struct smcd_gid *proposed_gid, unsigned int *matches) { struct smcd_dev *smcd; list_for_each_entry(smcd, &smcd_dev_list.list, list) { if (smcd->going_away) continue; if (smc_is_already_selected(smcd, ini, *matches)) continue; if (smc_ism_get_chid(smcd) == proposed_chid && !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) { ini->ism_peer_gid[*matches].gid = proposed_gid->gid; if (__smc_ism_is_emulated(proposed_chid)) ini->ism_peer_gid[*matches].gid_ext = proposed_gid->gid_ext; /* non-Emulated-ISM's peer gid_ext remains 0. */ ini->ism_dev[*matches] = smcd; (*matches)++; break; } } } static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini) { if (!ini->rc) ini->rc = rc; } static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc, struct smc_clc_msg_proposal *pclc, struct smc_init_info *ini) { struct smc_clc_smcd_v2_extension *smcd_v2_ext; struct smc_clc_v2_extension *smc_v2_ext; struct smc_clc_msg_smcd *pclc_smcd; unsigned int matches = 0; struct smcd_gid smcd_gid; u8 smcd_version; u8 *eid = NULL; int i, rc; u16 chid; if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2)) goto not_found; pclc_smcd = smc_get_clc_msg_smcd(pclc); smc_v2_ext = smc_get_clc_v2_ext(pclc); smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext); if (!pclc_smcd || !smc_v2_ext || !smcd_v2_ext) goto not_found; mutex_lock(&smcd_dev_list.mutex); if (pclc_smcd->ism.chid) { /* check for ISM device matching proposed native ISM device */ smcd_gid.gid = ntohll(pclc_smcd->ism.gid); smcd_gid.gid_ext = 0; smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid), &smcd_gid, &matches); } for (i = 0; i < smc_v2_ext->hdr.ism_gid_cnt; i++) { /* check for ISM devices matching proposed non-native ISM * devices */ smcd_gid.gid = ntohll(smcd_v2_ext->gidchid[i].gid); smcd_gid.gid_ext = 0; chid = ntohs(smcd_v2_ext->gidchid[i].chid); if (__smc_ism_is_emulated(chid)) { if ((i + 1) == smc_v2_ext->hdr.ism_gid_cnt || chid != ntohs(smcd_v2_ext->gidchid[i + 1].chid)) /* each Emulated-ISM device takes two GID-CHID * entries and CHID of the second entry repeats * that of the first entry. * * So check if the next GID-CHID entry exists * and both two entries' CHIDs are the same. */ continue; smcd_gid.gid_ext = ntohll(smcd_v2_ext->gidchid[++i].gid); } smc_check_ism_v2_match(ini, chid, &smcd_gid, &matches); } mutex_unlock(&smcd_dev_list.mutex); if (!ini->ism_dev[0]) { smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini); goto not_found; } smc_ism_get_system_eid(&eid); if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, smcd_v2_ext->system_eid, eid)) goto not_found; /* separate - outside the smcd_dev_list.lock */ smcd_version = ini->smcd_version; for (i = 0; i < matches; i++) { ini->smcd_version = SMC_V2; ini->is_smcd = true; ini->ism_selected = i; rc = smc_listen_ism_init(new_smc, ini); if (rc) { smc_find_ism_store_rc(rc, ini); /* try next active ISM device */ continue; } return; /* matching and usable V2 ISM device found */ } /* no V2 ISM device could be initialized */ ini->smcd_version = smcd_version; /* restore original value */ ini->negotiated_eid[0] = 0; not_found: ini->smcd_version &= ~SMC_V2; ini->ism_dev[0] = NULL; ini->is_smcd = false; } static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc, struct smc_clc_msg_proposal *pclc, struct smc_init_info *ini) { struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc); int rc = 0; /* check if ISM V1 is available */ if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1) || !pclc_smcd) goto not_found; ini->is_smcd = true; /* prepare ISM check */ ini->ism_peer_gid[0].gid = ntohll(pclc_smcd->ism.gid); ini->ism_peer_gid[0].gid_ext = 0; rc = smc_find_ism_device(new_smc, ini); if (rc) goto not_found; ini->ism_selected = 0; rc = smc_listen_ism_init(new_smc, ini); if (!rc) return; /* V1 ISM device found */ not_found: smc_find_ism_store_rc(rc, ini); ini->smcd_version &= ~SMC_V1; ini->ism_dev[0] = NULL; ini->is_smcd = false; } /* listen worker: register buffers */ static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first) { struct smc_connection *conn = &new_smc->conn; if (!local_first) { /* reg sendbufs if they were vzalloced */ if (conn->sndbuf_desc->is_vm) { if (smcr_lgr_reg_sndbufs(conn->lnk, conn->sndbuf_desc)) return SMC_CLC_DECL_ERR_REGBUF; } if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc)) return SMC_CLC_DECL_ERR_REGBUF; } return 0; } static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc, struct smc_clc_msg_proposal *pclc, struct smc_init_info *ini) { struct smc_clc_v2_extension *smc_v2_ext; u8 smcr_version; int rc; if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2)) goto not_found; smc_v2_ext = smc_get_clc_v2_ext(pclc); if (!smc_v2_ext || !smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL)) goto not_found; /* prepare RDMA check */ memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE); memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); ini->check_smcrv2 = true; ini->smcrv2.clc_sk = new_smc->clcsock->sk; ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr; ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce); rc = smc_find_rdma_device(new_smc, ini); if (rc) { smc_find_ism_store_rc(rc, ini); goto not_found; } if (!ini->smcrv2.uses_gateway) memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN); smcr_version = ini->smcr_version; ini->smcr_version = SMC_V2; rc = smc_listen_rdma_init(new_smc, ini); if (!rc) { rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local); if (rc) smc_conn_abort(new_smc, ini->first_contact_local); } if (!rc) return; ini->smcr_version = smcr_version; smc_find_ism_store_rc(rc, ini); not_found: ini->smcr_version &= ~SMC_V2; ini->smcrv2.ib_dev_v2 = NULL; ini->check_smcrv2 = false; } static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc, struct smc_clc_msg_proposal *pclc, struct smc_init_info *ini) { int rc; if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1)) return SMC_CLC_DECL_NOSMCDEV; /* prepare RDMA check */ memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE); memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); rc = smc_find_rdma_device(new_smc, ini); if (rc) { /* no RDMA device found */ return SMC_CLC_DECL_NOSMCDEV; } rc = smc_listen_rdma_init(new_smc, ini); if (rc) return rc; return smc_listen_rdma_reg(new_smc, ini->first_contact_local); } /* determine the local device matching to proposal */ static int smc_listen_find_device(struct smc_sock *new_smc, struct smc_clc_msg_proposal *pclc, struct smc_init_info *ini) { int prfx_rc; /* check for ISM device matching V2 proposed device */ smc_find_ism_v2_device_serv(new_smc, pclc, ini); if (ini->ism_dev[0]) return 0; /* check for matching IP prefix and subnet length (V1) */ prfx_rc = smc_listen_prfx_check(new_smc, pclc); if (prfx_rc) smc_find_ism_store_rc(prfx_rc, ini); /* get vlan id from IP device */ if (smc_vlan_by_tcpsk(new_smc->clcsock, ini)) return ini->rc ?: SMC_CLC_DECL_GETVLANERR; /* check for ISM device matching V1 proposed device */ if (!prfx_rc) smc_find_ism_v1_device_serv(new_smc, pclc, ini); if (ini->ism_dev[0]) return 0; if (!smcr_indicated(pclc->hdr.typev1) && !smcr_indicated(pclc->hdr.typev2)) /* skip RDMA and decline */ return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV; /* check if RDMA V2 is available */ smc_find_rdma_v2_device_serv(new_smc, pclc, ini); if (ini->smcrv2.ib_dev_v2) return 0; /* check if RDMA V1 is available */ if (!prfx_rc) { int rc; rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini); smc_find_ism_store_rc(rc, ini); return (!rc) ? 0 : ini->rc; } return prfx_rc; } /* listen worker: finish RDMA setup */ static int smc_listen_rdma_finish(struct smc_sock *new_smc, struct smc_clc_msg_accept_confirm *cclc, bool local_first, struct smc_init_info *ini) { struct smc_link *link = new_smc->conn.lnk; int reason_code = 0; if (local_first) smc_link_save_peer_info(link, cclc, ini); if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc)) return SMC_CLC_DECL_ERR_RTOK; if (local_first) { if (smc_ib_ready_link(link)) return SMC_CLC_DECL_ERR_RDYLNK; /* QP confirmation over RoCE fabric */ smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); reason_code = smcr_serv_conf_first_link(new_smc); smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); } return reason_code; } /* setup for connection of server */ static void smc_listen_work(struct work_struct *work) { struct smc_sock *new_smc = container_of(work, struct smc_sock, smc_listen_work); struct socket *newclcsock = new_smc->clcsock; struct smc_clc_msg_accept_confirm *cclc; struct smc_clc_msg_proposal_area *buf; struct smc_clc_msg_proposal *pclc; struct smc_init_info *ini = NULL; u8 proposal_version = SMC_V1; u8 accept_version; int rc = 0; lock_sock(&new_smc->sk); /* release in smc_listen_out() */ if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN) return smc_listen_out_err(new_smc); if (new_smc->use_fallback) { smc_listen_out_connected(new_smc); return; } /* check if peer is smc capable */ if (!tcp_sk(newclcsock->sk)->syn_smc) { rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC); if (rc) smc_listen_out_err(new_smc); else smc_listen_out_connected(new_smc); return; } /* do inband token exchange - * wait for and receive SMC Proposal CLC message */ buf = kzalloc(sizeof(*buf), GFP_KERNEL); if (!buf) { rc = SMC_CLC_DECL_MEM; goto out_decl; } pclc = (struct smc_clc_msg_proposal *)buf; rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf), SMC_CLC_PROPOSAL, CLC_WAIT_TIME); if (rc) goto out_decl; if (pclc->hdr.version > SMC_V1) proposal_version = SMC_V2; /* IPSec connections opt out of SMC optimizations */ if (using_ipsec(new_smc)) { rc = SMC_CLC_DECL_IPSEC; goto out_decl; } ini = kzalloc(sizeof(*ini), GFP_KERNEL); if (!ini) { rc = SMC_CLC_DECL_MEM; goto out_decl; } /* initial version checking */ rc = smc_listen_v2_check(new_smc, pclc, ini); if (rc) goto out_decl; rc = smc_clc_srv_v2x_features_validate(new_smc, pclc, ini); if (rc) goto out_decl; mutex_lock(&smc_server_lgr_pending); smc_rx_init(new_smc); smc_tx_init(new_smc); /* determine ISM or RoCE device used for connection */ rc = smc_listen_find_device(new_smc, pclc, ini); if (rc) goto out_unlock; /* send SMC Accept CLC message */ accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version; rc = smc_clc_send_accept(new_smc, ini->first_contact_local, accept_version, ini->negotiated_eid, ini); if (rc) goto out_unlock; /* SMC-D does not need this lock any more */ if (ini->is_smcd) mutex_unlock(&smc_server_lgr_pending); /* receive SMC Confirm CLC message */ memset(buf, 0, sizeof(*buf)); cclc = (struct smc_clc_msg_accept_confirm *)buf; rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf), SMC_CLC_CONFIRM, CLC_WAIT_TIME); if (rc) { if (!ini->is_smcd) goto out_unlock; goto out_decl; } rc = smc_clc_v2x_features_confirm_check(cclc, ini); if (rc) { if (!ini->is_smcd) goto out_unlock; goto out_decl; } /* fce smc release version is needed in smc_listen_rdma_finish, * so save fce info here. */ smc_conn_save_peer_info_fce(new_smc, cclc); /* finish worker */ if (!ini->is_smcd) { rc = smc_listen_rdma_finish(new_smc, cclc, ini->first_contact_local, ini); if (rc) goto out_unlock; mutex_unlock(&smc_server_lgr_pending); } smc_conn_save_peer_info(new_smc, cclc); if (ini->is_smcd && smc_ism_support_dmb_nocopy(new_smc->conn.lgr->smcd)) { rc = smcd_buf_attach(new_smc); if (rc) goto out_decl; } smc_listen_out_connected(new_smc); SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini); goto out_free; out_unlock: mutex_unlock(&smc_server_lgr_pending); out_decl: smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0, proposal_version); out_free: kfree(ini); kfree(buf); } static void smc_tcp_listen_work(struct work_struct *work) { struct smc_sock *lsmc = container_of(work, struct smc_sock, tcp_listen_work); struct sock *lsk = &lsmc->sk; struct smc_sock *new_smc; int rc = 0; lock_sock(lsk); while (lsk->sk_state == SMC_LISTEN) { rc = smc_clcsock_accept(lsmc, &new_smc); if (rc) /* clcsock accept queue empty or error */ goto out; if (!new_smc) continue; if (tcp_sk(new_smc->clcsock->sk)->syn_smc) atomic_inc(&lsmc->queued_smc_hs); new_smc->listen_smc = lsmc; new_smc->use_fallback = lsmc->use_fallback; new_smc->fallback_rsn = lsmc->fallback_rsn; sock_hold(lsk); /* sock_put in smc_listen_work */ INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); smc_copy_sock_settings_to_smc(new_smc); sock_hold(&new_smc->sk); /* sock_put in passive closing */ if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work)) sock_put(&new_smc->sk); } out: release_sock(lsk); sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */ } static void smc_clcsock_data_ready(struct sock *listen_clcsock) { struct smc_sock *lsmc; read_lock_bh(&listen_clcsock->sk_callback_lock); lsmc = smc_clcsock_user_data(listen_clcsock); if (!lsmc) goto out; lsmc->clcsk_data_ready(listen_clcsock); if (lsmc->sk.sk_state == SMC_LISTEN) { sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */ if (!queue_work(smc_tcp_ls_wq, &lsmc->tcp_listen_work)) sock_put(&lsmc->sk); } out: read_unlock_bh(&listen_clcsock->sk_callback_lock); } int smc_listen(struct socket *sock, int backlog) { struct sock *sk = sock->sk; struct smc_sock *smc; int rc; smc = smc_sk(sk); lock_sock(sk); rc = -EINVAL; if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) || smc->connect_nonblock || sock->state != SS_UNCONNECTED) goto out; rc = 0; if (sk->sk_state == SMC_LISTEN) { sk->sk_max_ack_backlog = backlog; goto out; } /* some socket options are handled in core, so we could not apply * them to the clc socket -- copy smc socket options to clc socket */ smc_copy_sock_settings_to_clc(smc); if (!smc->use_fallback) tcp_sk(smc->clcsock->sk)->syn_smc = 1; /* save original sk_data_ready function and establish * smc-specific sk_data_ready function */ write_lock_bh(&smc->clcsock->sk->sk_callback_lock); smc->clcsock->sk->sk_user_data = (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); smc_clcsock_replace_cb(&smc->clcsock->sk->sk_data_ready, smc_clcsock_data_ready, &smc->clcsk_data_ready); write_unlock_bh(&smc->clcsock->sk->sk_callback_lock); /* save original ops */ smc->ori_af_ops = inet_csk(smc->clcsock->sk)->icsk_af_ops; smc->af_ops = *smc->ori_af_ops; smc->af_ops.syn_recv_sock = smc_tcp_syn_recv_sock; inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops; if (smc->limit_smc_hs) tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested; rc = kernel_listen(smc->clcsock, backlog); if (rc) { write_lock_bh(&smc->clcsock->sk->sk_callback_lock); smc_clcsock_restore_cb(&smc->clcsock->sk->sk_data_ready, &smc->clcsk_data_ready); smc->clcsock->sk->sk_user_data = NULL; write_unlock_bh(&smc->clcsock->sk->sk_callback_lock); goto out; } sk->sk_max_ack_backlog = backlog; sk->sk_ack_backlog = 0; sk->sk_state = SMC_LISTEN; out: release_sock(sk); return rc; } int smc_accept(struct socket *sock, struct socket *new_sock, struct proto_accept_arg *arg) { struct sock *sk = sock->sk, *nsk; DECLARE_WAITQUEUE(wait, current); struct smc_sock *lsmc; long timeo; int rc = 0; lsmc = smc_sk(sk); sock_hold(sk); /* sock_put below */ lock_sock(sk); if (lsmc->sk.sk_state != SMC_LISTEN) { rc = -EINVAL; release_sock(sk); goto out; } /* Wait for an incoming connection */ timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK); add_wait_queue_exclusive(sk_sleep(sk), &wait); while (!(nsk = smc_accept_dequeue(sk, new_sock))) { set_current_state(TASK_INTERRUPTIBLE); if (!timeo) { rc = -EAGAIN; break; } release_sock(sk); timeo = schedule_timeout(timeo); /* wakeup by sk_data_ready in smc_listen_work() */ sched_annotate_sleep(); lock_sock(sk); if (signal_pending(current)) { rc = sock_intr_errno(timeo); break; } } set_current_state(TASK_RUNNING); remove_wait_queue(sk_sleep(sk), &wait); if (!rc) rc = sock_error(nsk); release_sock(sk); if (rc) goto out; if (lsmc->sockopt_defer_accept && !(arg->flags & O_NONBLOCK)) { /* wait till data arrives on the socket */ timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept * MSEC_PER_SEC); if (smc_sk(nsk)->use_fallback) { struct sock *clcsk = smc_sk(nsk)->clcsock->sk; lock_sock(clcsk); if (skb_queue_empty(&clcsk->sk_receive_queue)) sk_wait_data(clcsk, &timeo, NULL); release_sock(clcsk); } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { lock_sock(nsk); smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available); release_sock(nsk); } } out: sock_put(sk); /* sock_hold above */ return rc; } int smc_getname(struct socket *sock, struct sockaddr *addr, int peer) { struct smc_sock *smc; if (peer && (sock->sk->sk_state != SMC_ACTIVE) && (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) return -ENOTCONN; smc = smc_sk(sock->sk); return smc->clcsock->ops->getname(smc->clcsock, addr, peer); } int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) { struct sock *sk = sock->sk; struct smc_sock *smc; int rc; smc = smc_sk(sk); lock_sock(sk); /* SMC does not support connect with fastopen */ if (msg->msg_flags & MSG_FASTOPEN) { /* not connected yet, fallback */ if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); if (rc) goto out; } else { rc = -EINVAL; goto out; } } else if ((sk->sk_state != SMC_ACTIVE) && (sk->sk_state != SMC_APPCLOSEWAIT1) && (sk->sk_state != SMC_INIT)) { rc = -EPIPE; goto out; } if (smc->use_fallback) { rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); } else { rc = smc_tx_sendmsg(smc, msg, len); SMC_STAT_TX_PAYLOAD(smc, len, rc); } out: release_sock(sk); return rc; } int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, int flags) { struct sock *sk = sock->sk; struct smc_sock *smc; int rc = -ENOTCONN; smc = smc_sk(sk); lock_sock(sk); if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { /* socket was connected before, no more data to read */ rc = 0; goto out; } if ((sk->sk_state == SMC_INIT) || (sk->sk_state == SMC_LISTEN) || (sk->sk_state == SMC_CLOSED)) goto out; if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { rc = 0; goto out; } if (smc->use_fallback) { rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); } else { msg->msg_namelen = 0; rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); SMC_STAT_RX_PAYLOAD(smc, rc, rc); } out: release_sock(sk); return rc; } static __poll_t smc_accept_poll(struct sock *parent) { struct smc_sock *isk = smc_sk(parent); __poll_t mask = 0; spin_lock(&isk->accept_q_lock); if (!list_empty(&isk->accept_q)) mask = EPOLLIN | EPOLLRDNORM; spin_unlock(&isk->accept_q_lock); return mask; } __poll_t smc_poll(struct file *file, struct socket *sock, poll_table *wait) { struct sock *sk = sock->sk; struct smc_sock *smc; __poll_t mask = 0; if (!sk) return EPOLLNVAL; smc = smc_sk(sock->sk); if (smc->use_fallback) { /* delegate to CLC child sock */ mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); sk->sk_err = smc->clcsock->sk->sk_err; } else { if (sk->sk_state != SMC_CLOSED) sock_poll_wait(file, sock, wait); if (sk->sk_err) mask |= EPOLLERR; if ((sk->sk_shutdown == SHUTDOWN_MASK) || (sk->sk_state == SMC_CLOSED)) mask |= EPOLLHUP; if (sk->sk_state == SMC_LISTEN) { /* woken up by sk_data_ready in smc_listen_work() */ mask |= smc_accept_poll(sk); } else if (smc->use_fallback) { /* as result of connect_work()*/ mask |= smc->clcsock->ops->poll(file, smc->clcsock, wait); sk->sk_err = smc->clcsock->sk->sk_err; } else { if ((sk->sk_state != SMC_INIT && atomic_read(&smc->conn.sndbuf_space)) || sk->sk_shutdown & SEND_SHUTDOWN) { mask |= EPOLLOUT | EPOLLWRNORM; } else { sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); if (sk->sk_state != SMC_INIT) { /* Race breaker the same way as tcp_poll(). */ smp_mb__after_atomic(); if (atomic_read(&smc->conn.sndbuf_space)) mask |= EPOLLOUT | EPOLLWRNORM; } } if (atomic_read(&smc->conn.bytes_to_rcv)) mask |= EPOLLIN | EPOLLRDNORM; if (sk->sk_shutdown & RCV_SHUTDOWN) mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; if (sk->sk_state == SMC_APPCLOSEWAIT1) mask |= EPOLLIN; if (smc->conn.urg_state == SMC_URG_VALID) mask |= EPOLLPRI; } } return mask; } int smc_shutdown(struct socket *sock, int how) { struct sock *sk = sock->sk; bool do_shutdown = true; struct smc_sock *smc; int rc = -EINVAL; int old_state; int rc1 = 0; smc = smc_sk(sk); if ((how < SHUT_RD) || (how > SHUT_RDWR)) return rc; lock_sock(sk); if (sock->state == SS_CONNECTING) { if (sk->sk_state == SMC_ACTIVE) sock->state = SS_CONNECTED; else if (sk->sk_state == SMC_PEERCLOSEWAIT1 || sk->sk_state == SMC_PEERCLOSEWAIT2 || sk->sk_state == SMC_APPCLOSEWAIT1 || sk->sk_state == SMC_APPCLOSEWAIT2 || sk->sk_state == SMC_APPFINCLOSEWAIT) sock->state = SS_DISCONNECTING; } rc = -ENOTCONN; if ((sk->sk_state != SMC_ACTIVE) && (sk->sk_state != SMC_PEERCLOSEWAIT1) && (sk->sk_state != SMC_PEERCLOSEWAIT2) && (sk->sk_state != SMC_APPCLOSEWAIT1) && (sk->sk_state != SMC_APPCLOSEWAIT2) && (sk->sk_state != SMC_APPFINCLOSEWAIT)) goto out; if (smc->use_fallback) { rc = kernel_sock_shutdown(smc->clcsock, how); sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; if (sk->sk_shutdown == SHUTDOWN_MASK) { sk->sk_state = SMC_CLOSED; sk->sk_socket->state = SS_UNCONNECTED; sock_put(sk); } goto out; } switch (how) { case SHUT_RDWR: /* shutdown in both directions */ old_state = sk->sk_state; rc = smc_close_active(smc); if (old_state == SMC_ACTIVE && sk->sk_state == SMC_PEERCLOSEWAIT1) do_shutdown = false; break; case SHUT_WR: rc = smc_close_shutdown_write(smc); break; case SHUT_RD: rc = 0; /* nothing more to do because peer is not involved */ break; } if (do_shutdown && smc->clcsock) rc1 = kernel_sock_shutdown(smc->clcsock, how); /* map sock_shutdown_cmd constants to sk_shutdown value range */ sk->sk_shutdown |= how + 1; if (sk->sk_state == SMC_CLOSED) sock->state = SS_UNCONNECTED; else sock->state = SS_DISCONNECTING; out: release_sock(sk); return rc ? rc : rc1; } static int __smc_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) { struct smc_sock *smc; int val, len; smc = smc_sk(sock->sk); if (get_user(len, optlen)) return -EFAULT; len = min_t(int, len, sizeof(int)); if (len < 0) return -EINVAL; switch (optname) { case SMC_LIMIT_HS: val = smc->limit_smc_hs; break; default: return -EOPNOTSUPP; } if (put_user(len, optlen)) return -EFAULT; if (copy_to_user(optval, &val, len)) return -EFAULT; return 0; } static int __smc_setsockopt(struct socket *sock, int level, int optname, sockptr_t optval, unsigned int optlen) { struct sock *sk = sock->sk; struct smc_sock *smc; int val, rc; smc = smc_sk(sk); lock_sock(sk); switch (optname) { case SMC_LIMIT_HS: if (optlen < sizeof(int)) { rc = -EINVAL; break; } if (copy_from_sockptr(&val, optval, sizeof(int))) { rc = -EFAULT; break; } smc->limit_smc_hs = !!val; rc = 0; break; default: rc = -EOPNOTSUPP; break; } release_sock(sk); return rc; } int smc_setsockopt(struct socket *sock, int level, int optname, sockptr_t optval, unsigned int optlen) { struct sock *sk = sock->sk; struct smc_sock *smc; int val, rc; if (level == SOL_TCP && optname == TCP_ULP) return -EOPNOTSUPP; else if (level == SOL_SMC) return __smc_setsockopt(sock, level, optname, optval, optlen); smc = smc_sk(sk); /* generic setsockopts reaching us here always apply to the * CLC socket */ mutex_lock(&smc->clcsock_release_lock); if (!smc->clcsock) { mutex_unlock(&smc->clcsock_release_lock); return -EBADF; } if (unlikely(!smc->clcsock->ops->setsockopt)) rc = -EOPNOTSUPP; else rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, optval, optlen); if (smc->clcsock->sk->sk_err) { sk->sk_err = smc->clcsock->sk->sk_err; sk_error_report(sk); } mutex_unlock(&smc->clcsock_release_lock); if (optlen < sizeof(int)) return -EINVAL; if (copy_from_sockptr(&val, optval, sizeof(int))) return -EFAULT; lock_sock(sk); if (rc || smc->use_fallback) goto out; switch (optname) { case TCP_FASTOPEN: case TCP_FASTOPEN_CONNECT: case TCP_FASTOPEN_KEY: case TCP_FASTOPEN_NO_COOKIE: /* option not supported by SMC */ if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); } else { rc = -EINVAL; } break; case TCP_NODELAY: if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_CLOSED) { if (val) { SMC_STAT_INC(smc, ndly_cnt); smc_tx_pending(&smc->conn); cancel_delayed_work(&smc->conn.tx_work); } } break; case TCP_CORK: if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_CLOSED) { if (!val) { SMC_STAT_INC(smc, cork_cnt); smc_tx_pending(&smc->conn); cancel_delayed_work(&smc->conn.tx_work); } } break; case TCP_DEFER_ACCEPT: smc->sockopt_defer_accept = val; break; default: break; } out: release_sock(sk); return rc; } int smc_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) { struct smc_sock *smc; int rc; if (level == SOL_SMC) return __smc_getsockopt(sock, level, optname, optval, optlen); smc = smc_sk(sock->sk); mutex_lock(&smc->clcsock_release_lock); if (!smc->clcsock) { mutex_unlock(&smc->clcsock_release_lock); return -EBADF; } /* socket options apply to the CLC socket */ if (unlikely(!smc->clcsock->ops->getsockopt)) { mutex_unlock(&smc->clcsock_release_lock); return -EOPNOTSUPP; } rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, optval, optlen); mutex_unlock(&smc->clcsock_release_lock); return rc; } int smc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) { union smc_host_cursor cons, urg; struct smc_connection *conn; struct smc_sock *smc; int answ; smc = smc_sk(sock->sk); conn = &smc->conn; lock_sock(&smc->sk); if (smc->use_fallback) { if (!smc->clcsock) { release_sock(&smc->sk); return -EBADF; } answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); release_sock(&smc->sk); return answ; } switch (cmd) { case SIOCINQ: /* same as FIONREAD */ if (smc->sk.sk_state == SMC_LISTEN) { release_sock(&smc->sk); return -EINVAL; } if (smc->sk.sk_state == SMC_INIT || smc->sk.sk_state == SMC_CLOSED) answ = 0; else answ = atomic_read(&smc->conn.bytes_to_rcv); break; case SIOCOUTQ: /* output queue size (not send + not acked) */ if (smc->sk.sk_state == SMC_LISTEN) { release_sock(&smc->sk); return -EINVAL; } if (smc->sk.sk_state == SMC_INIT || smc->sk.sk_state == SMC_CLOSED) answ = 0; else answ = smc->conn.sndbuf_desc->len - atomic_read(&smc->conn.sndbuf_space); break; case SIOCOUTQNSD: /* output queue size (not send only) */ if (smc->sk.sk_state == SMC_LISTEN) { release_sock(&smc->sk); return -EINVAL; } if (smc->sk.sk_state == SMC_INIT || smc->sk.sk_state == SMC_CLOSED) answ = 0; else answ = smc_tx_prepared_sends(&smc->conn); break; case SIOCATMARK: if (smc->sk.sk_state == SMC_LISTEN) { release_sock(&smc->sk); return -EINVAL; } if (smc->sk.sk_state == SMC_INIT || smc->sk.sk_state == SMC_CLOSED) { answ = 0; } else { smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); smc_curs_copy(&urg, &conn->urg_curs, conn); answ = smc_curs_diff(conn->rmb_desc->len, &cons, &urg) == 1; } break; default: release_sock(&smc->sk); return -ENOIOCTLCMD; } release_sock(&smc->sk); return put_user(answ, (int __user *)arg); } /* Map the affected portions of the rmbe into an spd, note the number of bytes * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor * updates till whenever a respective page has been fully processed. * Note that subsequent recv() calls have to wait till all splice() processing * completed. */ ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, unsigned int flags) { struct sock *sk = sock->sk; struct smc_sock *smc; int rc = -ENOTCONN; smc = smc_sk(sk); lock_sock(sk); if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { /* socket was connected before, no more data to read */ rc = 0; goto out; } if (sk->sk_state == SMC_INIT || sk->sk_state == SMC_LISTEN || sk->sk_state == SMC_CLOSED) goto out; if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { rc = 0; goto out; } if (smc->use_fallback) { rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, pipe, len, flags); } else { if (*ppos) { rc = -ESPIPE; goto out; } if (flags & SPLICE_F_NONBLOCK) flags = MSG_DONTWAIT; else flags = 0; SMC_STAT_INC(smc, splice_cnt); rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); } out: release_sock(sk); return rc; } /* must look like tcp */ static const struct proto_ops smc_sock_ops = { .family = PF_SMC, .owner = THIS_MODULE, .release = smc_release, .bind = smc_bind, .connect = smc_connect, .socketpair = sock_no_socketpair, .accept = smc_accept, .getname = smc_getname, .poll = smc_poll, .ioctl = smc_ioctl, .listen = smc_listen, .shutdown = smc_shutdown, .setsockopt = smc_setsockopt, .getsockopt = smc_getsockopt, .sendmsg = smc_sendmsg, .recvmsg = smc_recvmsg, .mmap = sock_no_mmap, .splice_read = smc_splice_read, }; int smc_create_clcsk(struct net *net, struct sock *sk, int family) { struct smc_sock *smc = smc_sk(sk); int rc; rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, &smc->clcsock); if (rc) return rc; /* smc_clcsock_release() does not wait smc->clcsock->sk's * destruction; its sk_state might not be TCP_CLOSE after * smc->sk is close()d, and TCP timers can be fired later, * which need net ref. */ sk = smc->clcsock->sk; __netns_tracker_free(net, &sk->ns_tracker, false); sk->sk_net_refcnt = 1; get_net_track(net, &sk->ns_tracker, GFP_KERNEL); sock_inuse_add(net, 1); return 0; } static int __smc_create(struct net *net, struct socket *sock, int protocol, int kern, struct socket *clcsock) { int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; struct smc_sock *smc; struct sock *sk; int rc; rc = -ESOCKTNOSUPPORT; if (sock->type != SOCK_STREAM) goto out; rc = -EPROTONOSUPPORT; if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) goto out; rc = -ENOBUFS; sock->ops = &smc_sock_ops; sock->state = SS_UNCONNECTED; sk = smc_sock_alloc(net, sock, protocol); if (!sk) goto out; /* create internal TCP socket for CLC handshake and fallback */ smc = smc_sk(sk); rc = 0; if (clcsock) smc->clcsock = clcsock; else rc = smc_create_clcsk(net, sk, family); if (rc) { sk_common_release(sk); sock->sk = NULL; } out: return rc; } static int smc_create(struct net *net, struct socket *sock, int protocol, int kern) { return __smc_create(net, sock, protocol, kern, NULL); } static const struct net_proto_family smc_sock_family_ops = { .family = PF_SMC, .owner = THIS_MODULE, .create = smc_create, }; static int smc_ulp_init(struct sock *sk) { struct socket *tcp = sk->sk_socket; struct net *net = sock_net(sk); struct socket *smcsock; int protocol, ret; /* only TCP can be replaced */ if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP || (sk->sk_family != AF_INET && sk->sk_family != AF_INET6)) return -ESOCKTNOSUPPORT; /* don't handle wq now */ if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list) return -ENOTCONN; if (sk->sk_family == AF_INET) protocol = SMCPROTO_SMC; else protocol = SMCPROTO_SMC6; smcsock = sock_alloc(); if (!smcsock) return -ENFILE; smcsock->type = SOCK_STREAM; __module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */ ret = __smc_create(net, smcsock, protocol, 1, tcp); if (ret) { sock_release(smcsock); /* module_put() which ops won't be NULL */ return ret; } /* replace tcp socket to smc */ smcsock->file = tcp->file; smcsock->file->private_data = smcsock; smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */ smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */ tcp->file = NULL; return ret; } static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk, const gfp_t priority) { struct inet_connection_sock *icsk = inet_csk(newsk); /* don't inherit ulp ops to child when listen */ icsk->icsk_ulp_ops = NULL; } static struct tcp_ulp_ops smc_ulp_ops __read_mostly = { .name = "smc", .owner = THIS_MODULE, .init = smc_ulp_init, .clone = smc_ulp_clone, }; unsigned int smc_net_id; static __net_init int smc_net_init(struct net *net) { int rc; rc = smc_sysctl_net_init(net); if (rc) return rc; return smc_pnet_net_init(net); } static void __net_exit smc_net_exit(struct net *net) { smc_sysctl_net_exit(net); smc_pnet_net_exit(net); } static __net_init int smc_net_stat_init(struct net *net) { return smc_stats_init(net); } static void __net_exit smc_net_stat_exit(struct net *net) { smc_stats_exit(net); } static struct pernet_operations smc_net_ops = { .init = smc_net_init, .exit = smc_net_exit, .id = &smc_net_id, .size = sizeof(struct smc_net), }; static struct pernet_operations smc_net_stat_ops = { .init = smc_net_stat_init, .exit = smc_net_stat_exit, }; static int __init smc_init(void) { int rc; rc = register_pernet_subsys(&smc_net_ops); if (rc) return rc; rc = register_pernet_subsys(&smc_net_stat_ops); if (rc) goto out_pernet_subsys; rc = smc_ism_init(); if (rc) goto out_pernet_subsys_stat; smc_clc_init(); rc = smc_nl_init(); if (rc) goto out_ism; rc = smc_pnet_init(); if (rc) goto out_nl; rc = -ENOMEM; smc_tcp_ls_wq = alloc_workqueue("smc_tcp_ls_wq", 0, 0); if (!smc_tcp_ls_wq) goto out_pnet; smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0); if (!smc_hs_wq) goto out_alloc_tcp_ls_wq; smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0); if (!smc_close_wq) goto out_alloc_hs_wq; rc = smc_core_init(); if (rc) { pr_err("%s: smc_core_init fails with %d\n", __func__, rc); goto out_alloc_wqs; } rc = smc_llc_init(); if (rc) { pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); goto out_core; } rc = smc_cdc_init(); if (rc) { pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); goto out_core; } rc = proto_register(&smc_proto, 1); if (rc) { pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); goto out_core; } rc = proto_register(&smc_proto6, 1); if (rc) { pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); goto out_proto; } rc = sock_register(&smc_sock_family_ops); if (rc) { pr_err("%s: sock_register fails with %d\n", __func__, rc); goto out_proto6; } INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); rc = smc_ib_register_client(); if (rc) { pr_err("%s: ib_register fails with %d\n", __func__, rc); goto out_sock; } rc = smc_loopback_init(); if (rc) { pr_err("%s: smc_loopback_init fails with %d\n", __func__, rc); goto out_ib; } rc = tcp_register_ulp(&smc_ulp_ops); if (rc) { pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc); goto out_lo; } rc = smc_inet_init(); if (rc) { pr_err("%s: smc_inet_init fails with %d\n", __func__, rc); goto out_ulp; } static_branch_enable(&tcp_have_smc); return 0; out_ulp: tcp_unregister_ulp(&smc_ulp_ops); out_lo: smc_loopback_exit(); out_ib: smc_ib_unregister_client(); out_sock: sock_unregister(PF_SMC); out_proto6: proto_unregister(&smc_proto6); out_proto: proto_unregister(&smc_proto); out_core: smc_core_exit(); out_alloc_wqs: destroy_workqueue(smc_close_wq); out_alloc_hs_wq: destroy_workqueue(smc_hs_wq); out_alloc_tcp_ls_wq: destroy_workqueue(smc_tcp_ls_wq); out_pnet: smc_pnet_exit(); out_nl: smc_nl_exit(); out_ism: smc_clc_exit(); smc_ism_exit(); out_pernet_subsys_stat: unregister_pernet_subsys(&smc_net_stat_ops); out_pernet_subsys: unregister_pernet_subsys(&smc_net_ops); return rc; } static void __exit smc_exit(void) { static_branch_disable(&tcp_have_smc); smc_inet_exit(); tcp_unregister_ulp(&smc_ulp_ops); sock_unregister(PF_SMC); smc_core_exit(); smc_loopback_exit(); smc_ib_unregister_client(); smc_ism_exit(); destroy_workqueue(smc_close_wq); destroy_workqueue(smc_tcp_ls_wq); destroy_workqueue(smc_hs_wq); proto_unregister(&smc_proto6); proto_unregister(&smc_proto); smc_pnet_exit(); smc_nl_exit(); smc_clc_exit(); unregister_pernet_subsys(&smc_net_stat_ops); unregister_pernet_subsys(&smc_net_ops); rcu_barrier(); } module_init(smc_init); module_exit(smc_exit); MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); MODULE_DESCRIPTION("smc socket address family"); MODULE_LICENSE("GPL"); MODULE_ALIAS_NETPROTO(PF_SMC); MODULE_ALIAS_TCP_ULP("smc"); /* 256 for IPPROTO_SMC and 1 for SOCK_STREAM */ MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 256, 1); #if IS_ENABLED(CONFIG_IPV6) MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 256, 1); #endif /* CONFIG_IPV6 */ MODULE_ALIAS_GENL_FAMILY(SMC_GENL_FAMILY_NAME);
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