| // 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; |
| } |
| |
| 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_close_init(smc); |
| 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_close_init(smc); |
| 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); |
| |
| 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 (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); |
| |
| 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)) |
| 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_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; |
| |
| 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_close_init(new_smc); |
| 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 (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; |
| |