| // 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 <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_tx.h" |
| #include "smc_rx.h" |
| #include "smc_close.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 void smc_tcp_listen_work(struct work_struct *); |
| static void smc_connect_work(struct work_struct *); |
| |
| 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 smc_hashinfo smc_v4_hashinfo = { |
| .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock), |
| }; |
| |
| static 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); |
| sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
| write_unlock_bh(&h->lock); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(smc_hash_sk); |
| |
| 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); |
| } |
| EXPORT_SYMBOL_GPL(smc_unhash_sk); |
| |
| struct proto smc_proto = { |
| .name = "SMC", |
| .owner = THIS_MODULE, |
| .keepalive = smc_set_keepalive, |
| .hash = smc_hash_sk, |
| .unhash = smc_unhash_sk, |
| .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, |
| .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_restore_fallback_changes(struct smc_sock *smc) |
| { |
| smc->clcsock->file->private_data = smc->sk.sk_socket; |
| smc->clcsock->file = NULL; |
| } |
| |
| 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); |
| sock_set_flag(sk, SOCK_DEAD); |
| sk->sk_shutdown |= SHUTDOWN_MASK; |
| } else { |
| 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; |
| } |
| |
| static int smc_release(struct socket *sock) |
| { |
| struct sock *sk = sock->sk; |
| struct smc_sock *smc; |
| int rc = 0; |
| |
| if (!sk) |
| goto out; |
| |
| smc = smc_sk(sk); |
| |
| /* cleanup for a dangling non-blocking connect */ |
| if (smc->connect_nonblock && sk->sk_state == SMC_INIT) |
| tcp_abort(smc->clcsock->sk, ECONNABORTED); |
| flush_work(&smc->connect_work); |
| |
| 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); |
| |
| rc = __smc_release(smc); |
| |
| /* detach socket */ |
| sock_orphan(sk); |
| sock->sk = NULL; |
| release_sock(sk); |
| |
| 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; |
| |
| sk_refcnt_debug_dec(sk); |
| } |
| |
| static struct sock *smc_sock_alloc(struct net *net, struct socket *sock, |
| int protocol) |
| { |
| struct smc_sock *smc; |
| 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 */ |
| sk->sk_state = SMC_INIT; |
| sk->sk_destruct = smc_destruct; |
| sk->sk_protocol = protocol; |
| smc = smc_sk(sk); |
| 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); |
| sk_refcnt_debug_inc(sk); |
| mutex_init(&smc->clcsock_release_lock); |
| |
| return sk; |
| } |
| |
| static 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; |
| rc = kernel_bind(smc->clcsock, uaddr, addr_len); |
| |
| out_rel: |
| release_sock(sk); |
| out: |
| return rc; |
| } |
| |
| 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_sndbuf = osk->sk_sndbuf; |
| nsk->sk_rcvbuf = osk->sk_rcvbuf; |
| nsk->sk_sndtimeo = osk->sk_sndtimeo; |
| nsk->sk_rcvtimeo = osk->sk_rcvtimeo; |
| nsk->sk_mark = osk->sk_mark; |
| nsk->sk_priority = 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; |
| } |
| |
| #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)) |
| /* 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) |
| */ |
| 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 a new rmb, send confirm_rkey msg to register with peer */ |
| static int smc_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc, |
| bool conf_rkey) |
| { |
| if (!rmb_desc->wr_reg) { |
| /* register memory region for new rmb */ |
| if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) { |
| rmb_desc->regerr = 1; |
| return -EFAULT; |
| } |
| rmb_desc->wr_reg = 1; |
| } |
| if (!conf_rkey) |
| return 0; |
| /* exchange confirm_rkey msg with peer */ |
| if (smc_llc_do_confirm_rkey(link, rmb_desc)) { |
| rmb_desc->regerr = 1; |
| return -EFAULT; |
| } |
| return 0; |
| } |
| |
| static int smc_clnt_conf_first_link(struct smc_sock *smc) |
| { |
| struct net *net = sock_net(smc->clcsock->sk); |
| struct smc_link_group *lgr = smc->conn.lgr; |
| struct smc_link *link; |
| int rest; |
| int rc; |
| |
| link = &lgr->lnk[SMC_SINGLE_LINK]; |
| /* receive CONFIRM LINK request from server over RoCE fabric */ |
| rest = wait_for_completion_interruptible_timeout( |
| &link->llc_confirm, |
| SMC_LLC_WAIT_FIRST_TIME); |
| if (rest <= 0) { |
| 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; |
| } |
| |
| if (link->llc_confirm_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); |
| |
| if (smc_reg_rmb(link, smc->conn.rmb_desc, false)) |
| return SMC_CLC_DECL_ERR_REGRMB; |
| |
| /* 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; |
| |
| /* receive ADD LINK request from server over RoCE fabric */ |
| rest = wait_for_completion_interruptible_timeout(&link->llc_add, |
| SMC_LLC_WAIT_TIME); |
| if (rest <= 0) { |
| 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_AL : rc; |
| } |
| |
| /* send add link reject message, only one link supported for now */ |
| rc = smc_llc_send_add_link(link, |
| link->smcibdev->mac[link->ibport - 1], |
| link->gid, SMC_LLC_RESP); |
| if (rc < 0) |
| return SMC_CLC_DECL_TIMEOUT_AL; |
| |
| smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time); |
| |
| return 0; |
| } |
| |
| static void smcr_conn_save_peer_info(struct smc_sock *smc, |
| struct smc_clc_msg_accept_confirm *clc) |
| { |
| int bufsize = smc_uncompress_bufsize(clc->rmbe_size); |
| |
| smc->conn.peer_rmbe_idx = clc->rmbe_idx; |
| smc->conn.local_tx_ctrl.token = ntohl(clc->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->dmbe_size); |
| |
| smc->conn.peer_rmbe_idx = clc->dmbe_idx; |
| smc->conn.peer_token = clc->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); |
| } |
| |
| static void smc_link_save_peer_info(struct smc_link *link, |
| struct smc_clc_msg_accept_confirm *clc) |
| { |
| link->peer_qpn = ntoh24(clc->qpn); |
| memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE); |
| memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac)); |
| link->peer_psn = ntoh24(clc->psn); |
| link->peer_mtu = clc->qp_mtu; |
| } |
| |
| static void smc_switch_to_fallback(struct smc_sock *smc) |
| { |
| smc->use_fallback = true; |
| 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; |
| } |
| } |
| |
| /* fall back during connect */ |
| static int smc_connect_fallback(struct smc_sock *smc, int reason_code) |
| { |
| smc_switch_to_fallback(smc); |
| smc->fallback_rsn = reason_code; |
| 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) |
| { |
| int rc; |
| |
| if (reason_code < 0) { /* error, fallback is not possible */ |
| 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); |
| if (rc < 0) { |
| if (smc->sk.sk_state == SMC_INIT) |
| sock_put(&smc->sk); /* passive closing */ |
| return rc; |
| } |
| } |
| return smc_connect_fallback(smc, reason_code); |
| } |
| |
| /* abort connecting */ |
| static int smc_connect_abort(struct smc_sock *smc, int reason_code, |
| int local_contact) |
| { |
| if (local_contact == SMC_FIRST_CONTACT) |
| smc_lgr_forget(smc->conn.lgr); |
| if (smc->conn.lgr->is_smcd) |
| /* there is only one lgr role for SMC-D; use server lock */ |
| mutex_unlock(&smc_server_lgr_pending); |
| else |
| mutex_unlock(&smc_client_lgr_pending); |
| |
| smc_conn_free(&smc->conn); |
| smc->connect_nonblock = 0; |
| return reason_code; |
| } |
| |
| /* 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->ib_dev) |
| 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) |
| return SMC_CLC_DECL_NOSMCDDEV; |
| return 0; |
| } |
| |
| /* 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, ini->vlan_id)) |
| return SMC_CLC_DECL_ISMVLANERR; |
| return 0; |
| } |
| |
| /* 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, bool is_smcd, |
| struct smc_init_info *ini) |
| { |
| if (!is_smcd) |
| return 0; |
| if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev, ini->vlan_id)) |
| return SMC_CLC_DECL_CNFERR; |
| return 0; |
| } |
| |
| /* CLC handshake during connect */ |
| static int smc_connect_clc(struct smc_sock *smc, int smc_type, |
| 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, smc_type, ini); |
| if (rc) |
| return rc; |
| /* receive SMC Accept CLC message */ |
| return smc_clc_wait_msg(smc, aclc, sizeof(*aclc), SMC_CLC_ACCEPT, |
| CLC_WAIT_TIME); |
| } |
| |
| /* 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) |
| { |
| struct smc_link *link; |
| int reason_code = 0; |
| |
| ini->is_smcd = false; |
| ini->ib_lcl = &aclc->lcl; |
| ini->ib_clcqpn = ntoh24(aclc->qpn); |
| ini->srv_first_contact = aclc->hdr.flag; |
| |
| 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; |
| } |
| link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK]; |
| |
| smc_conn_save_peer_info(smc, aclc); |
| |
| /* create send buffer and rmb */ |
| if (smc_buf_create(smc, false)) |
| return smc_connect_abort(smc, SMC_CLC_DECL_MEM, |
| ini->cln_first_contact); |
| |
| if (ini->cln_first_contact == SMC_FIRST_CONTACT) |
| smc_link_save_peer_info(link, aclc); |
| |
| if (smc_rmb_rtoken_handling(&smc->conn, aclc)) |
| return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RTOK, |
| ini->cln_first_contact); |
| |
| smc_close_init(smc); |
| smc_rx_init(smc); |
| |
| if (ini->cln_first_contact == SMC_FIRST_CONTACT) { |
| if (smc_ib_ready_link(link)) |
| return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RDYLNK, |
| ini->cln_first_contact); |
| } else { |
| if (smc_reg_rmb(link, smc->conn.rmb_desc, true)) |
| return smc_connect_abort(smc, SMC_CLC_DECL_ERR_REGRMB, |
| ini->cln_first_contact); |
| } |
| smc_rmb_sync_sg_for_device(&smc->conn); |
| |
| reason_code = smc_clc_send_confirm(smc); |
| if (reason_code) |
| return smc_connect_abort(smc, reason_code, |
| ini->cln_first_contact); |
| |
| smc_tx_init(smc); |
| |
| if (ini->cln_first_contact == SMC_FIRST_CONTACT) { |
| /* QP confirmation over RoCE fabric */ |
| reason_code = smc_clnt_conf_first_link(smc); |
| if (reason_code) |
| return smc_connect_abort(smc, reason_code, |
| ini->cln_first_contact); |
| } |
| 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; |
| } |
| |
| /* 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) |
| { |
| int rc = 0; |
| |
| ini->is_smcd = true; |
| ini->ism_gid = aclc->gid; |
| ini->srv_first_contact = aclc->hdr.flag; |
| |
| /* 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 */ |
| if (smc_buf_create(smc, true)) |
| return smc_connect_abort(smc, SMC_CLC_DECL_MEM, |
| ini->cln_first_contact); |
| |
| smc_conn_save_peer_info(smc, aclc); |
| smc_close_init(smc); |
| smc_rx_init(smc); |
| smc_tx_init(smc); |
| |
| rc = smc_clc_send_confirm(smc); |
| if (rc) |
| return smc_connect_abort(smc, rc, ini->cln_first_contact); |
| 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; |
| } |
| |
| /* perform steps before actually connecting */ |
| static int __smc_connect(struct smc_sock *smc) |
| { |
| bool ism_supported = false, rdma_supported = false; |
| struct smc_clc_msg_accept_confirm aclc; |
| struct smc_init_info ini = {0}; |
| int smc_type; |
| 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-R optimizations */ |
| if (using_ipsec(smc)) |
| return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC); |
| |
| /* get vlan id from IP device */ |
| if (smc_vlan_by_tcpsk(smc->clcsock, &ini)) |
| return smc_connect_decline_fallback(smc, |
| SMC_CLC_DECL_GETVLANERR); |
| |
| /* check if there is an ism device available */ |
| if (!smc_find_ism_device(smc, &ini) && |
| !smc_connect_ism_vlan_setup(smc, &ini)) { |
| /* ISM is supported for this connection */ |
| ism_supported = true; |
| smc_type = SMC_TYPE_D; |
| } |
| |
| /* check if there is a rdma device available */ |
| if (!smc_find_rdma_device(smc, &ini)) { |
| /* RDMA is supported for this connection */ |
| rdma_supported = true; |
| if (ism_supported) |
| smc_type = SMC_TYPE_B; /* both */ |
| else |
| smc_type = SMC_TYPE_R; /* only RDMA */ |
| } |
| |
| /* if neither ISM nor RDMA are supported, fallback */ |
| if (!rdma_supported && !ism_supported) |
| return smc_connect_decline_fallback(smc, SMC_CLC_DECL_NOSMCDEV); |
| |
| /* perform CLC handshake */ |
| rc = smc_connect_clc(smc, smc_type, &aclc, &ini); |
| if (rc) { |
| smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini); |
| return smc_connect_decline_fallback(smc, rc); |
| } |
| |
| /* depending on previous steps, connect using rdma or ism */ |
| if (rdma_supported && aclc.hdr.path == SMC_TYPE_R) |
| rc = smc_connect_rdma(smc, &aclc, &ini); |
| else if (ism_supported && aclc.hdr.path == SMC_TYPE_D) |
| rc = smc_connect_ism(smc, &aclc, &ini); |
| else |
| rc = SMC_CLC_DECL_MODEUNSUPP; |
| if (rc) { |
| smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini); |
| return smc_connect_decline_fallback(smc, rc); |
| } |
| |
| smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini); |
| return 0; |
| } |
| |
| 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 | TCP_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 (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); |
| } |
| |
| static 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 (sk->sk_state) { |
| default: |
| goto out; |
| case SMC_ACTIVE: |
| rc = -EISCONN; |
| goto out; |
| case SMC_INIT: |
| rc = 0; |
| 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; |
| |
| sock_hold(&smc->sk); /* sock put in passive closing */ |
| if (smc->use_fallback) |
| goto out; |
| if (flags & O_NONBLOCK) { |
| if (schedule_work(&smc->connect_work)) |
| smc->connect_nonblock = 1; |
| rc = -EINPROGRESS; |
| } else { |
| rc = __smc_connect(smc); |
| if (rc < 0) |
| goto out; |
| else |
| rc = 0; /* success cases including fallback */ |
| } |
| |
| 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, 0); |
| mutex_unlock(&lsmc->clcsock_release_lock); |
| lock_sock(lsk); |
| if (rc < 0) |
| 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; |
| sock_set_flag(new_sk, SOCK_DEAD); |
| sock_put(new_sk); /* final */ |
| *new_smc = NULL; |
| goto out; |
| } |
| |
| (*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); |
| 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); |
| |
| lock_sock(sk); |
| if (!sk->sk_lingertime) |
| /* wait for peer closing */ |
| sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT; |
| __smc_release(smc); |
| release_sock(sk); |
| sock_put(sk); /* final sock_put */ |
| } |
| |
| static int smc_serv_conf_first_link(struct smc_sock *smc) |
| { |
| struct net *net = sock_net(smc->clcsock->sk); |
| struct smc_link_group *lgr = smc->conn.lgr; |
| struct smc_link *link; |
| int rest; |
| int rc; |
| |
| link = &lgr->lnk[SMC_SINGLE_LINK]; |
| |
| if (smc_reg_rmb(link, smc->conn.rmb_desc, false)) |
| return SMC_CLC_DECL_ERR_REGRMB; |
| |
| /* 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 */ |
| rest = wait_for_completion_interruptible_timeout( |
| &link->llc_confirm_resp, |
| SMC_LLC_WAIT_FIRST_TIME); |
| if (rest <= 0) { |
| 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; |
| } |
| |
| if (link->llc_confirm_resp_rc) |
| return SMC_CLC_DECL_RMBE_EC; |
| |
| /* send ADD LINK request to client over the RoCE fabric */ |
| rc = smc_llc_send_add_link(link, |
| link->smcibdev->mac[link->ibport - 1], |
| link->gid, SMC_LLC_REQ); |
| if (rc < 0) |
| return SMC_CLC_DECL_TIMEOUT_AL; |
| |
| /* receive ADD LINK response from client over the RoCE fabric */ |
| rest = wait_for_completion_interruptible_timeout(&link->llc_add_resp, |
| SMC_LLC_WAIT_TIME); |
| if (rest <= 0) { |
| 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_AL : rc; |
| } |
| |
| smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time); |
| |
| 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 (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; |
| |
| sk_refcnt_debug_inc(newsmcsk); |
| 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; |
| |
| if (newsmcsk->sk_state == SMC_INIT) |
| sock_put(&new_smc->sk); /* passive closing */ |
| newsmcsk->sk_state = SMC_CLOSED; |
| smc_conn_free(&new_smc->conn); |
| |
| 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_contact) |
| { |
| /* RDMA setup failed, switch back to TCP */ |
| if (local_contact == SMC_FIRST_CONTACT) |
| smc_lgr_forget(new_smc->conn.lgr); |
| if (reason_code < 0) { /* error, no fallback possible */ |
| smc_listen_out_err(new_smc); |
| return; |
| } |
| smc_conn_free(&new_smc->conn); |
| smc_switch_to_fallback(new_smc); |
| new_smc->fallback_rsn = reason_code; |
| if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { |
| if (smc_clc_send_decline(new_smc, reason_code) < 0) { |
| smc_listen_out_err(new_smc); |
| return; |
| } |
| } |
| smc_listen_out_connected(new_smc); |
| } |
| |
| /* 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; |
| |
| 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)) |
| 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_clc_msg_proposal *pclc, |
| struct smc_init_info *ini) |
| { |
| struct smc_clc_msg_smcd *pclc_smcd; |
| int rc; |
| |
| pclc_smcd = smc_get_clc_msg_smcd(pclc); |
| ini->ism_gid = pclc_smcd->gid; |
| rc = smc_conn_create(new_smc, ini); |
| if (rc) |
| return rc; |
| |
| /* Check if peer can be reached via ISM device */ |
| if (smc_ism_cantalk(new_smc->conn.lgr->peer_gid, |
| new_smc->conn.lgr->vlan_id, |
| new_smc->conn.lgr->smcd)) { |
| if (ini->cln_first_contact == SMC_FIRST_CONTACT) |
| smc_lgr_forget(new_smc->conn.lgr); |
| smc_conn_free(&new_smc->conn); |
| return SMC_CLC_DECL_SMCDNOTALK; |
| } |
| |
| /* Create send and receive buffers */ |
| if (smc_buf_create(new_smc, true)) { |
| if (ini->cln_first_contact == SMC_FIRST_CONTACT) |
| smc_lgr_forget(new_smc->conn.lgr); |
| smc_conn_free(&new_smc->conn); |
| return SMC_CLC_DECL_MEM; |
| } |
| |
| return 0; |
| } |
| |
| /* listen worker: register buffers */ |
| static int smc_listen_rdma_reg(struct smc_sock *new_smc, int local_contact) |
| { |
| struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK]; |
| |
| if (local_contact != SMC_FIRST_CONTACT) { |
| if (smc_reg_rmb(link, new_smc->conn.rmb_desc, true)) |
| return SMC_CLC_DECL_ERR_REGRMB; |
| } |
| smc_rmb_sync_sg_for_device(&new_smc->conn); |
| |
| return 0; |
| } |
| |
| /* listen worker: finish RDMA setup */ |
| static int smc_listen_rdma_finish(struct smc_sock *new_smc, |
| struct smc_clc_msg_accept_confirm *cclc, |
| int local_contact) |
| { |
| struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK]; |
| int reason_code = 0; |
| |
| if (local_contact == SMC_FIRST_CONTACT) |
| smc_link_save_peer_info(link, cclc); |
| |
| if (smc_rmb_rtoken_handling(&new_smc->conn, cclc)) { |
| reason_code = SMC_CLC_DECL_ERR_RTOK; |
| goto decline; |
| } |
| |
| if (local_contact == SMC_FIRST_CONTACT) { |
| if (smc_ib_ready_link(link)) { |
| reason_code = SMC_CLC_DECL_ERR_RDYLNK; |
| goto decline; |
| } |
| /* QP confirmation over RoCE fabric */ |
| reason_code = smc_serv_conf_first_link(new_smc); |
| if (reason_code) |
| goto decline; |
| } |
| return 0; |
| |
| decline: |
| smc_listen_decline(new_smc, reason_code, local_contact); |
| return reason_code; |
| } |
| |
| /* setup for RDMA 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 *pclc; |
| struct smc_init_info ini = {0}; |
| bool ism_supported = false; |
| u8 buf[SMC_CLC_MAX_LEN]; |
| 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) { |
| smc_switch_to_fallback(new_smc); |
| new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC; |
| smc_listen_out_connected(new_smc); |
| return; |
| } |
| |
| /* do inband token exchange - |
| * wait for and receive SMC Proposal CLC message |
| */ |
| pclc = (struct smc_clc_msg_proposal *)&buf; |
| rc = smc_clc_wait_msg(new_smc, pclc, SMC_CLC_MAX_LEN, |
| SMC_CLC_PROPOSAL, CLC_WAIT_TIME); |
| if (rc) |
| goto out_decl; |
| |
| /* IPSec connections opt out of SMC-R optimizations */ |
| if (using_ipsec(new_smc)) { |
| rc = SMC_CLC_DECL_IPSEC; |
| goto out_decl; |
| } |
| |
| /* check for matching IP prefix and subnet length */ |
| rc = smc_listen_prfx_check(new_smc, pclc); |
| if (rc) |
| goto out_decl; |
| |
| /* get vlan id from IP device */ |
| if (smc_vlan_by_tcpsk(new_smc->clcsock, &ini)) { |
| rc = SMC_CLC_DECL_GETVLANERR; |
| goto out_decl; |
| } |
| |
| mutex_lock(&smc_server_lgr_pending); |
| smc_close_init(new_smc); |
| smc_rx_init(new_smc); |
| smc_tx_init(new_smc); |
| |
| /* check if ISM is available */ |
| if (pclc->hdr.path == SMC_TYPE_D || pclc->hdr.path == SMC_TYPE_B) { |
| ini.is_smcd = true; /* prepare ISM check */ |
| rc = smc_find_ism_device(new_smc, &ini); |
| if (!rc) |
| rc = smc_listen_ism_init(new_smc, pclc, &ini); |
| if (!rc) |
| ism_supported = true; |
| else if (pclc->hdr.path == SMC_TYPE_D) |
| goto out_unlock; /* skip RDMA and decline */ |
| } |
| |
| /* check if RDMA is available */ |
| if (!ism_supported) { /* SMC_TYPE_R or SMC_TYPE_B */ |
| /* prepare RDMA check */ |
| ini.is_smcd = false; |
| ini.ism_dev = NULL; |
| ini.ib_lcl = &pclc->lcl; |
| rc = smc_find_rdma_device(new_smc, &ini); |
| if (rc) { |
| /* no RDMA device found */ |
| if (pclc->hdr.path == SMC_TYPE_B) |
| /* neither ISM nor RDMA device found */ |
| rc = SMC_CLC_DECL_NOSMCDEV; |
| goto out_unlock; |
| } |
| rc = smc_listen_rdma_init(new_smc, &ini); |
| if (rc) |
| goto out_unlock; |
| rc = smc_listen_rdma_reg(new_smc, ini.cln_first_contact); |
| if (rc) |
| goto out_unlock; |
| } |
| |
| /* send SMC Accept CLC message */ |
| rc = smc_clc_send_accept(new_smc, ini.cln_first_contact); |
| if (rc) |
| goto out_unlock; |
| |
| /* SMC-D does not need this lock any more */ |
| if (ism_supported) |
| mutex_unlock(&smc_server_lgr_pending); |
| |
| /* receive SMC Confirm CLC message */ |
| rc = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc), |
| SMC_CLC_CONFIRM, CLC_WAIT_TIME); |
| if (rc) { |
| if (!ism_supported) |
| goto out_unlock; |
| goto out_decl; |
| } |
| |
| /* finish worker */ |
| if (!ism_supported) { |
| rc = smc_listen_rdma_finish(new_smc, &cclc, |
| ini.cln_first_contact); |
| mutex_unlock(&smc_server_lgr_pending); |
| if (rc) |
| return; |
| } |
| smc_conn_save_peer_info(new_smc, &cclc); |
| smc_listen_out_connected(new_smc); |
| return; |
| |
| out_unlock: |
| mutex_unlock(&smc_server_lgr_pending); |
| out_decl: |
| smc_listen_decline(new_smc, rc, ini.cln_first_contact); |
| } |
| |
| 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) |
| goto out; |
| if (!new_smc) |
| continue; |
| |
| 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); |
| new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf; |
| new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf; |
| sock_hold(&new_smc->sk); /* sock_put in passive closing */ |
| if (!schedule_work(&new_smc->smc_listen_work)) |
| sock_put(&new_smc->sk); |
| } |
| |
| out: |
| release_sock(lsk); |
| sock_put(&lsmc->sk); /* sock_hold in smc_listen */ |
| } |
| |
| static 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) |
| 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; |
| |
| rc = kernel_listen(smc->clcsock, backlog); |
| if (rc) |
| goto out; |
| sk->sk_max_ack_backlog = backlog; |
| sk->sk_ack_backlog = 0; |
| sk->sk_state = SMC_LISTEN; |
| sock_hold(sk); /* sock_hold in tcp_listen_worker */ |
| if (!schedule_work(&smc->tcp_listen_work)) |
| sock_put(sk); |
| |
| out: |
| release_sock(sk); |
| return rc; |
| } |
| |
| static int smc_accept(struct socket *sock, struct socket *new_sock, |
| int flags, bool kern) |
| { |
| 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, 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 && !(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; |
| } |
| |
| static 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); |
| } |
| |
| static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
| { |
| struct sock *sk = sock->sk; |
| struct smc_sock *smc; |
| int rc = -EPIPE; |
| |
| smc = smc_sk(sk); |
| lock_sock(sk); |
| if ((sk->sk_state != SMC_ACTIVE) && |
| (sk->sk_state != SMC_APPCLOSEWAIT1) && |
| (sk->sk_state != SMC_INIT)) |
| goto out; |
| |
| if (msg->msg_flags & MSG_FASTOPEN) { |
| if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { |
| smc_switch_to_fallback(smc); |
| smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP; |
| } else { |
| rc = -EINVAL; |
| goto out; |
| } |
| } |
| |
| if (smc->use_fallback) |
| rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); |
| else |
| rc = smc_tx_sendmsg(smc, msg, len); |
| out: |
| release_sock(sk); |
| return rc; |
| } |
| |
| static 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); |
| } |
| |
| 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; |
| } |
| |
| static __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; |
| } |
| |
| static int smc_shutdown(struct socket *sock, int how) |
| { |
| struct sock *sk = sock->sk; |
| struct smc_sock *smc; |
| int rc = -EINVAL; |
| int rc1 = 0; |
| |
| smc = smc_sk(sk); |
| |
| if ((how < SHUT_RD) || (how > SHUT_RDWR)) |
| return rc; |
| |
| lock_sock(sk); |
| |
| 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; |
| goto out; |
| } |
| switch (how) { |
| case SHUT_RDWR: /* shutdown in both directions */ |
| rc = smc_close_active(smc); |
| 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 (smc->clcsock) |
| rc1 = kernel_sock_shutdown(smc->clcsock, how); |
| /* map sock_shutdown_cmd constants to sk_shutdown value range */ |
| sk->sk_shutdown |= how + 1; |
| |
| out: |
| release_sock(sk); |
| return rc ? rc : rc1; |
| } |
| |
| static int smc_setsockopt(struct socket *sock, int level, int optname, |
| char __user *optval, unsigned int optlen) |
| { |
| struct sock *sk = sock->sk; |
| struct smc_sock *smc; |
| int val, rc; |
| |
| smc = smc_sk(sk); |
| |
| /* generic setsockopts reaching us here always apply to the |
| * CLC socket |
| */ |
| 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->sk_error_report(sk); |
| } |
| |
| if (optlen < sizeof(int)) |
| return -EINVAL; |
| if (get_user(val, (int __user *)optval)) |
| return -EFAULT; |
| |
| lock_sock(sk); |
| if (rc || smc->use_fallback) |
| goto out; |
| switch (optname) { |
| case TCP_ULP: |
| 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) { |
| smc_switch_to_fallback(smc); |
| smc->fallback_rsn = 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) |
| mod_delayed_work(system_wq, &smc->conn.tx_work, |
| 0); |
| } |
| break; |
| case TCP_CORK: |
| if (sk->sk_state != SMC_INIT && |
| sk->sk_state != SMC_LISTEN && |
| sk->sk_state != SMC_CLOSED) { |
| if (!val) |
| mod_delayed_work(system_wq, &smc->conn.tx_work, |
| 0); |
| } |
| break; |
| case TCP_DEFER_ACCEPT: |
| smc->sockopt_defer_accept = val; |
| break; |
| default: |
| break; |
| } |
| out: |
| release_sock(sk); |
| |
| return rc; |
| } |
| |
| static int smc_getsockopt(struct socket *sock, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| struct smc_sock *smc; |
| |
| smc = smc_sk(sock->sk); |
| /* socket options apply to the CLC socket */ |
| return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, |
| optval, optlen); |
| } |
| |
| static 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); |
| } |
| |
| static ssize_t smc_sendpage(struct socket *sock, struct page *page, |
| int offset, size_t size, int flags) |
| { |
| struct sock *sk = sock->sk; |
| struct smc_sock *smc; |
| int rc = -EPIPE; |
| |
| smc = smc_sk(sk); |
| lock_sock(sk); |
| if (sk->sk_state != SMC_ACTIVE) { |
| release_sock(sk); |
| goto out; |
| } |
| release_sock(sk); |
| if (smc->use_fallback) |
| rc = kernel_sendpage(smc->clcsock, page, offset, |
| size, flags); |
| else |
| rc = sock_no_sendpage(sock, page, offset, size, flags); |
| |
| out: |
| return rc; |
| } |
| |
| /* 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. |
| */ |
| static 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; |
| 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, |
| .sendpage = smc_sendpage, |
| .splice_read = smc_splice_read, |
| }; |
| |
| static int smc_create(struct net *net, struct socket *sock, int protocol, |
| int kern) |
| { |
| 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; |
| sk = smc_sock_alloc(net, sock, protocol); |
| if (!sk) |
| goto out; |
| |
| /* create internal TCP socket for CLC handshake and fallback */ |
| smc = smc_sk(sk); |
| smc->use_fallback = false; /* assume rdma capability first */ |
| smc->fallback_rsn = 0; |
| rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, |
| &smc->clcsock); |
| if (rc) { |
| sk_common_release(sk); |
| goto out; |
| } |
| smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE); |
| smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE); |
| |
| out: |
| return rc; |
| } |
| |
| static const struct net_proto_family smc_sock_family_ops = { |
| .family = PF_SMC, |
| .owner = THIS_MODULE, |
| .create = smc_create, |
| }; |
| |
| unsigned int smc_net_id; |
| |
| static __net_init int smc_net_init(struct net *net) |
| { |
| return smc_pnet_net_init(net); |
| } |
| |
| static void __net_exit smc_net_exit(struct net *net) |
| { |
| smc_pnet_net_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 int __init smc_init(void) |
| { |
| int rc; |
| |
| rc = register_pernet_subsys(&smc_net_ops); |
| if (rc) |
| return rc; |
| |
| rc = smc_pnet_init(); |
| if (rc) |
| goto out_pernet_subsys; |
| |
| rc = smc_llc_init(); |
| if (rc) { |
| pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); |
| goto out_pnet; |
| } |
| |
| rc = smc_cdc_init(); |
| if (rc) { |
| pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); |
| goto out_pnet; |
| } |
| |
| rc = proto_register(&smc_proto, 1); |
| if (rc) { |
| pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); |
| goto out_pnet; |
| } |
| |
| 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; |
| } |
| |
| static_branch_enable(&tcp_have_smc); |
| return 0; |
| |
| out_sock: |
| sock_unregister(PF_SMC); |
| out_proto6: |
| proto_unregister(&smc_proto6); |
| out_proto: |
| proto_unregister(&smc_proto); |
| out_pnet: |
| smc_pnet_exit(); |
| out_pernet_subsys: |
| unregister_pernet_subsys(&smc_net_ops); |
| |
| return rc; |
| } |
| |
| static void __exit smc_exit(void) |
| { |
| smc_core_exit(); |
| static_branch_disable(&tcp_have_smc); |
| smc_ib_unregister_client(); |
| sock_unregister(PF_SMC); |
| proto_unregister(&smc_proto6); |
| proto_unregister(&smc_proto); |
| smc_pnet_exit(); |
| unregister_pernet_subsys(&smc_net_ops); |
| } |
| |
| 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); |