2017-01-09 08:55:13 -07:00
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* AF_SMC protocol family socket handler keeping the AF_INET sock address type
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* applies to SOCK_STREAM sockets only
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* offers an alternative communication option for TCP-protocol sockets
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* applicable with RoCE-cards only
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*
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2017-01-09 08:55:16 -07:00
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* Initial restrictions:
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* - IPv6 support postponed
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* - support for alternate links postponed
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* - partial support for non-blocking sockets only
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* - support for urgent data postponed
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*
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2017-01-09 08:55:13 -07:00
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* Copyright IBM Corp. 2016
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*
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* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
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* based on prototype from Frank Blaschka
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*/
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#define KMSG_COMPONENT "smc"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/socket.h>
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2017-01-09 08:55:16 -07:00
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#include <linux/workqueue.h>
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2017-01-09 08:55:22 -07:00
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#include <linux/in.h>
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2017-02-02 00:35:14 -07:00
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#include <linux/sched/signal.h>
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2017-01-09 08:55:13 -07:00
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#include <net/sock.h>
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2017-01-09 08:55:16 -07:00
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#include <net/tcp.h>
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2017-01-09 08:55:26 -07:00
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#include <net/smc.h>
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2017-01-09 08:55:13 -07:00
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#include "smc.h"
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2017-01-09 08:55:16 -07:00
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#include "smc_clc.h"
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2017-01-09 08:55:21 -07:00
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#include "smc_llc.h"
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2017-01-09 08:55:22 -07:00
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#include "smc_cdc.h"
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2017-01-09 08:55:17 -07:00
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#include "smc_core.h"
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2017-01-09 08:55:14 -07:00
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#include "smc_ib.h"
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2017-01-09 08:55:15 -07:00
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#include "smc_pnet.h"
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2017-01-09 08:55:23 -07:00
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#include "smc_tx.h"
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2017-01-09 08:55:24 -07:00
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#include "smc_rx.h"
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2017-01-09 08:55:25 -07:00
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#include "smc_close.h"
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2017-01-09 08:55:13 -07:00
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2017-01-09 08:55:17 -07:00
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static DEFINE_MUTEX(smc_create_lgr_pending); /* serialize link group
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* creation
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*/
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struct smc_lgr_list smc_lgr_list = { /* established link groups */
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.lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
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.list = LIST_HEAD_INIT(smc_lgr_list.list),
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};
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2017-01-09 08:55:16 -07:00
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static void smc_tcp_listen_work(struct work_struct *);
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2017-01-09 08:55:13 -07:00
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static void smc_set_keepalive(struct sock *sk, int val)
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{
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struct smc_sock *smc = smc_sk(sk);
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smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
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}
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2017-01-09 08:55:26 -07:00
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static struct smc_hashinfo smc_v4_hashinfo = {
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.lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
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};
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int smc_hash_sk(struct sock *sk)
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{
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struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
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struct hlist_head *head;
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head = &h->ht;
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write_lock_bh(&h->lock);
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sk_add_node(sk, head);
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
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write_unlock_bh(&h->lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(smc_hash_sk);
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void smc_unhash_sk(struct sock *sk)
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{
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struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
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write_lock_bh(&h->lock);
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if (sk_del_node_init(sk))
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
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write_unlock_bh(&h->lock);
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}
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EXPORT_SYMBOL_GPL(smc_unhash_sk);
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struct proto smc_proto = {
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2017-01-09 08:55:13 -07:00
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.name = "SMC",
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.owner = THIS_MODULE,
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.keepalive = smc_set_keepalive,
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2017-01-09 08:55:26 -07:00
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.hash = smc_hash_sk,
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.unhash = smc_unhash_sk,
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2017-01-09 08:55:13 -07:00
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.obj_size = sizeof(struct smc_sock),
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2017-01-09 08:55:26 -07:00
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.h.smc_hash = &smc_v4_hashinfo,
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2017-01-18 03:53:44 -07:00
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.slab_flags = SLAB_TYPESAFE_BY_RCU,
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2017-01-09 08:55:13 -07:00
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};
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2017-01-09 08:55:26 -07:00
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EXPORT_SYMBOL_GPL(smc_proto);
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2017-01-09 08:55:13 -07:00
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static int smc_release(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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struct smc_sock *smc;
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2017-01-09 08:55:25 -07:00
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int rc = 0;
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2017-01-09 08:55:13 -07:00
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if (!sk)
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goto out;
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smc = smc_sk(sk);
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2017-01-09 08:55:25 -07:00
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if (sk->sk_state == SMC_LISTEN)
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/* smc_close_non_accepted() is called and acquires
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* sock lock for child sockets again
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*/
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lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
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else
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lock_sock(sk);
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2017-01-09 08:55:13 -07:00
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2018-01-26 01:28:48 -07:00
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if (!smc->use_fallback) {
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2017-01-09 08:55:25 -07:00
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rc = smc_close_active(smc);
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sock_set_flag(sk, SOCK_DEAD);
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sk->sk_shutdown |= SHUTDOWN_MASK;
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}
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2017-01-09 08:55:13 -07:00
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if (smc->clcsock) {
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sock_release(smc->clcsock);
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smc->clcsock = NULL;
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}
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2018-01-26 01:28:48 -07:00
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if (smc->use_fallback) {
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sock_put(sk); /* passive closing */
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sk->sk_state = SMC_CLOSED;
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sk->sk_state_change(sk);
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}
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2017-01-09 08:55:13 -07:00
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/* detach socket */
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sock_orphan(sk);
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sock->sk = NULL;
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2018-01-26 01:28:48 -07:00
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if (!smc->use_fallback && sk->sk_state == SMC_CLOSED)
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2017-01-09 08:55:25 -07:00
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smc_conn_free(&smc->conn);
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2017-01-09 08:55:13 -07:00
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release_sock(sk);
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2018-01-26 01:28:48 -07:00
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sk->sk_prot->unhash(sk);
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sock_put(sk); /* final sock_put */
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2017-01-09 08:55:13 -07:00
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out:
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2017-01-09 08:55:25 -07:00
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return rc;
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2017-01-09 08:55:13 -07:00
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}
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static void smc_destruct(struct sock *sk)
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{
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if (sk->sk_state != SMC_CLOSED)
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return;
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if (!sock_flag(sk, SOCK_DEAD))
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return;
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sk_refcnt_debug_dec(sk);
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}
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static struct sock *smc_sock_alloc(struct net *net, struct socket *sock)
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{
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struct smc_sock *smc;
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struct sock *sk;
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sk = sk_alloc(net, PF_SMC, GFP_KERNEL, &smc_proto, 0);
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if (!sk)
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return NULL;
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sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
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sk->sk_state = SMC_INIT;
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sk->sk_destruct = smc_destruct;
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sk->sk_protocol = SMCPROTO_SMC;
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smc = smc_sk(sk);
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2017-01-09 08:55:16 -07:00
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INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
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INIT_LIST_HEAD(&smc->accept_q);
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spin_lock_init(&smc->accept_q_lock);
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2017-01-09 08:55:26 -07:00
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sk->sk_prot->hash(sk);
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2017-01-09 08:55:16 -07:00
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sk_refcnt_debug_inc(sk);
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2017-01-09 08:55:13 -07:00
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return sk;
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}
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static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
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int addr_len)
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{
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struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
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struct sock *sk = sock->sk;
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struct smc_sock *smc;
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int rc;
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smc = smc_sk(sk);
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/* replicate tests from inet_bind(), to be safe wrt. future changes */
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rc = -EINVAL;
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if (addr_len < sizeof(struct sockaddr_in))
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goto out;
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rc = -EAFNOSUPPORT;
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/* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
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if ((addr->sin_family != AF_INET) &&
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((addr->sin_family != AF_UNSPEC) ||
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(addr->sin_addr.s_addr != htonl(INADDR_ANY))))
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goto out;
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lock_sock(sk);
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/* Check if socket is already active */
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rc = -EINVAL;
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if (sk->sk_state != SMC_INIT)
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goto out_rel;
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smc->clcsock->sk->sk_reuse = sk->sk_reuse;
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rc = kernel_bind(smc->clcsock, uaddr, addr_len);
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out_rel:
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release_sock(sk);
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out:
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return rc;
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}
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static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
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unsigned long mask)
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{
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/* options we don't get control via setsockopt for */
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nsk->sk_type = osk->sk_type;
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nsk->sk_sndbuf = osk->sk_sndbuf;
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nsk->sk_rcvbuf = osk->sk_rcvbuf;
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nsk->sk_sndtimeo = osk->sk_sndtimeo;
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nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
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nsk->sk_mark = osk->sk_mark;
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nsk->sk_priority = osk->sk_priority;
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nsk->sk_rcvlowat = osk->sk_rcvlowat;
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nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
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nsk->sk_err = osk->sk_err;
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nsk->sk_flags &= ~mask;
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nsk->sk_flags |= osk->sk_flags & mask;
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}
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#define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
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(1UL << SOCK_KEEPOPEN) | \
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(1UL << SOCK_LINGER) | \
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(1UL << SOCK_BROADCAST) | \
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(1UL << SOCK_TIMESTAMP) | \
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(1UL << SOCK_DBG) | \
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(1UL << SOCK_RCVTSTAMP) | \
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(1UL << SOCK_RCVTSTAMPNS) | \
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(1UL << SOCK_LOCALROUTE) | \
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(1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
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(1UL << SOCK_RXQ_OVFL) | \
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(1UL << SOCK_WIFI_STATUS) | \
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(1UL << SOCK_NOFCS) | \
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(1UL << SOCK_FILTER_LOCKED))
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/* copy only relevant settings and flags of SOL_SOCKET level from smc to
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* clc socket (since smc is not called for these options from net/core)
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*/
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static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
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{
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smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
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}
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#define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
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(1UL << SOCK_KEEPOPEN) | \
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(1UL << SOCK_LINGER) | \
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(1UL << SOCK_DBG))
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/* copy only settings and flags relevant for smc from clc to smc socket */
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static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
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{
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smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
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}
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2018-03-01 05:51:26 -07:00
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static int smc_clnt_conf_first_link(struct smc_sock *smc)
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2017-01-09 08:55:21 -07:00
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{
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struct smc_link_group *lgr = smc->conn.lgr;
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struct smc_link *link;
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int rest;
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int rc;
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link = &lgr->lnk[SMC_SINGLE_LINK];
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/* receive CONFIRM LINK request from server over RoCE fabric */
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rest = wait_for_completion_interruptible_timeout(
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&link->llc_confirm,
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SMC_LLC_WAIT_FIRST_TIME);
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if (rest <= 0) {
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struct smc_clc_msg_decline dclc;
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rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
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SMC_CLC_DECLINE);
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return rc;
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}
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rc = smc_ib_modify_qp_rts(link);
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if (rc)
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return SMC_CLC_DECL_INTERR;
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smc_wr_remember_qp_attr(link);
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2017-07-28 05:56:17 -06:00
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rc = smc_wr_reg_send(link,
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smc->conn.rmb_desc->mr_rx[SMC_SINGLE_LINK]);
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if (rc)
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return SMC_CLC_DECL_INTERR;
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2017-01-09 08:55:21 -07:00
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/* send CONFIRM LINK response over RoCE fabric */
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rc = smc_llc_send_confirm_link(link,
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link->smcibdev->mac[link->ibport - 1],
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2018-03-01 05:51:26 -07:00
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&link->smcibdev->gid[link->ibport - 1],
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SMC_LLC_RESP);
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2017-01-09 08:55:21 -07:00
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if (rc < 0)
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return SMC_CLC_DECL_TCL;
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return rc;
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}
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2017-01-09 08:55:17 -07:00
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static void smc_conn_save_peer_info(struct smc_sock *smc,
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struct smc_clc_msg_accept_confirm *clc)
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{
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|
|
|
smc->conn.peer_conn_idx = clc->conn_idx;
|
2017-01-09 08:55:22 -07:00
|
|
|
smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token);
|
2017-01-09 08:55:18 -07:00
|
|
|
smc->conn.peer_rmbe_size = smc_uncompress_bufsize(clc->rmbe_size);
|
|
|
|
atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
|
2017-01-09 08:55:17 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2018-01-25 03:15:34 -07:00
|
|
|
static void smc_lgr_forget(struct smc_link_group *lgr)
|
|
|
|
{
|
|
|
|
spin_lock_bh(&smc_lgr_list.lock);
|
|
|
|
/* do not use this link group for new connections */
|
|
|
|
if (!list_empty(&lgr->list))
|
|
|
|
list_del_init(&lgr->list);
|
|
|
|
spin_unlock_bh(&smc_lgr_list.lock);
|
|
|
|
}
|
|
|
|
|
2017-01-09 08:55:16 -07:00
|
|
|
/* setup for RDMA connection of client */
|
|
|
|
static int smc_connect_rdma(struct smc_sock *smc)
|
|
|
|
{
|
|
|
|
struct smc_clc_msg_accept_confirm aclc;
|
2017-01-09 08:55:17 -07:00
|
|
|
int local_contact = SMC_FIRST_CONTACT;
|
2017-01-09 08:55:16 -07:00
|
|
|
struct smc_ib_device *smcibdev;
|
2017-01-09 08:55:17 -07:00
|
|
|
struct smc_link *link;
|
|
|
|
u8 srv_first_contact;
|
2017-01-09 08:55:16 -07:00
|
|
|
int reason_code = 0;
|
|
|
|
int rc = 0;
|
|
|
|
u8 ibport;
|
|
|
|
|
2018-01-26 01:28:48 -07:00
|
|
|
sock_hold(&smc->sk); /* sock put in passive closing */
|
|
|
|
|
2017-10-25 03:01:46 -06:00
|
|
|
if (!tcp_sk(smc->clcsock->sk)->syn_smc) {
|
|
|
|
/* peer has not signalled SMC-capability */
|
|
|
|
smc->use_fallback = true;
|
|
|
|
goto out_connected;
|
|
|
|
}
|
|
|
|
|
2017-01-09 08:55:16 -07:00
|
|
|
/* IPSec connections opt out of SMC-R optimizations */
|
|
|
|
if (using_ipsec(smc)) {
|
|
|
|
reason_code = SMC_CLC_DECL_IPSEC;
|
|
|
|
goto decline_rdma;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* 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, &smcibdev, &ibport);
|
|
|
|
if (!smcibdev) {
|
|
|
|
reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
|
|
|
|
goto decline_rdma;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* do inband token exchange */
|
|
|
|
reason_code = smc_clc_send_proposal(smc, smcibdev, ibport);
|
|
|
|
if (reason_code < 0) {
|
|
|
|
rc = reason_code;
|
|
|
|
goto out_err;
|
|
|
|
}
|
|
|
|
if (reason_code > 0) /* configuration error */
|
|
|
|
goto decline_rdma;
|
|
|
|
/* receive SMC Accept CLC message */
|
|
|
|
reason_code = smc_clc_wait_msg(smc, &aclc, sizeof(aclc),
|
|
|
|
SMC_CLC_ACCEPT);
|
|
|
|
if (reason_code < 0) {
|
|
|
|
rc = reason_code;
|
|
|
|
goto out_err;
|
|
|
|
}
|
|
|
|
if (reason_code > 0)
|
|
|
|
goto decline_rdma;
|
|
|
|
|
2017-01-09 08:55:17 -07:00
|
|
|
srv_first_contact = aclc.hdr.flag;
|
|
|
|
mutex_lock(&smc_create_lgr_pending);
|
2018-03-01 05:51:28 -07:00
|
|
|
local_contact = smc_conn_create(smc, smcibdev, ibport, &aclc.lcl,
|
|
|
|
srv_first_contact);
|
2017-01-09 08:55:17 -07:00
|
|
|
if (local_contact < 0) {
|
|
|
|
rc = local_contact;
|
|
|
|
if (rc == -ENOMEM)
|
|
|
|
reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
|
|
|
|
else if (rc == -ENOLINK)
|
|
|
|
reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */
|
|
|
|
goto decline_rdma_unlock;
|
|
|
|
}
|
|
|
|
link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK];
|
2017-01-09 08:55:16 -07:00
|
|
|
|
2017-01-09 08:55:17 -07:00
|
|
|
smc_conn_save_peer_info(smc, &aclc);
|
2017-01-09 08:55:18 -07:00
|
|
|
|
2017-07-28 05:56:20 -06:00
|
|
|
/* create send buffer and rmb */
|
|
|
|
rc = smc_buf_create(smc);
|
2017-01-09 08:55:18 -07:00
|
|
|
if (rc) {
|
|
|
|
reason_code = SMC_CLC_DECL_MEM;
|
|
|
|
goto decline_rdma_unlock;
|
|
|
|
}
|
|
|
|
|
2017-01-09 08:55:17 -07:00
|
|
|
if (local_contact == SMC_FIRST_CONTACT)
|
|
|
|
smc_link_save_peer_info(link, &aclc);
|
2017-01-09 08:55:20 -07:00
|
|
|
|
|
|
|
rc = smc_rmb_rtoken_handling(&smc->conn, &aclc);
|
|
|
|
if (rc) {
|
|
|
|
reason_code = SMC_CLC_DECL_INTERR;
|
|
|
|
goto decline_rdma_unlock;
|
|
|
|
}
|
|
|
|
|
2017-04-10 06:58:01 -06:00
|
|
|
smc_close_init(smc);
|
|
|
|
smc_rx_init(smc);
|
|
|
|
|
2017-01-09 08:55:20 -07:00
|
|
|
if (local_contact == SMC_FIRST_CONTACT) {
|
|
|
|
rc = smc_ib_ready_link(link);
|
|
|
|
if (rc) {
|
|
|
|
reason_code = SMC_CLC_DECL_INTERR;
|
|
|
|
goto decline_rdma_unlock;
|
|
|
|
}
|
2017-07-28 05:56:17 -06:00
|
|
|
} else {
|
|
|
|
struct smc_buf_desc *buf_desc = smc->conn.rmb_desc;
|
|
|
|
|
|
|
|
if (!buf_desc->reused) {
|
|
|
|
/* register memory region for new rmb */
|
|
|
|
rc = smc_wr_reg_send(link,
|
|
|
|
buf_desc->mr_rx[SMC_SINGLE_LINK]);
|
|
|
|
if (rc) {
|
|
|
|
reason_code = SMC_CLC_DECL_INTERR;
|
|
|
|
goto decline_rdma_unlock;
|
|
|
|
}
|
|
|
|
}
|
2017-01-09 08:55:20 -07:00
|
|
|
}
|
2017-07-28 05:56:22 -06:00
|
|
|
smc_rmb_sync_sg_for_device(&smc->conn);
|
2017-01-09 08:55:16 -07:00
|
|
|
|
|
|
|
rc = smc_clc_send_confirm(smc);
|
|
|
|
if (rc)
|
2017-01-09 08:55:17 -07:00
|
|
|
goto out_err_unlock;
|
2017-01-09 08:55:16 -07:00
|
|
|
|
2017-01-09 08:55:21 -07:00
|
|
|
if (local_contact == SMC_FIRST_CONTACT) {
|
|
|
|
/* QP confirmation over RoCE fabric */
|
2018-03-01 05:51:26 -07:00
|
|
|
reason_code = smc_clnt_conf_first_link(smc);
|
2017-01-09 08:55:21 -07:00
|
|
|
if (reason_code < 0) {
|
|
|
|
rc = reason_code;
|
|
|
|
goto out_err_unlock;
|
|
|
|
}
|
|
|
|
if (reason_code > 0)
|
|
|
|
goto decline_rdma_unlock;
|
|
|
|
}
|
2017-01-09 08:55:16 -07:00
|
|
|
|
2017-01-09 08:55:17 -07:00
|
|
|
mutex_unlock(&smc_create_lgr_pending);
|
2017-01-09 08:55:23 -07:00
|
|
|
smc_tx_init(smc);
|
|
|
|
|
2017-01-09 08:55:16 -07:00
|
|
|
out_connected:
|
|
|
|
smc_copy_sock_settings_to_clc(smc);
|
2017-01-09 08:55:25 -07:00
|
|
|
if (smc->sk.sk_state == SMC_INIT)
|
|
|
|
smc->sk.sk_state = SMC_ACTIVE;
|
2017-01-09 08:55:16 -07:00
|
|
|
|
2017-01-09 08:55:17 -07:00
|
|
|
return rc ? rc : local_contact;
|
2017-01-09 08:55:16 -07:00
|
|
|
|
2017-01-09 08:55:17 -07:00
|
|
|
decline_rdma_unlock:
|
2018-01-25 03:15:34 -07:00
|
|
|
if (local_contact == SMC_FIRST_CONTACT)
|
|
|
|
smc_lgr_forget(smc->conn.lgr);
|
2017-01-09 08:55:17 -07:00
|
|
|
mutex_unlock(&smc_create_lgr_pending);
|
|
|
|
smc_conn_free(&smc->conn);
|
2017-01-09 08:55:16 -07:00
|
|
|
decline_rdma:
|
|
|
|
/* RDMA setup failed, switch back to TCP */
|
|
|
|
smc->use_fallback = true;
|
|
|
|
if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) {
|
2017-09-21 01:16:32 -06:00
|
|
|
rc = smc_clc_send_decline(smc, reason_code);
|
2017-12-07 05:38:45 -07:00
|
|
|
if (rc < 0)
|
2017-01-09 08:55:16 -07:00
|
|
|
goto out_err;
|
|
|
|
}
|
|
|
|
goto out_connected;
|
|
|
|
|
2017-01-09 08:55:17 -07:00
|
|
|
out_err_unlock:
|
2018-01-25 03:15:34 -07:00
|
|
|
if (local_contact == SMC_FIRST_CONTACT)
|
|
|
|
smc_lgr_forget(smc->conn.lgr);
|
2017-01-09 08:55:17 -07:00
|
|
|
mutex_unlock(&smc_create_lgr_pending);
|
|
|
|
smc_conn_free(&smc->conn);
|
2017-01-09 08:55:16 -07:00
|
|
|
out_err:
|
2018-01-26 01:28:48 -07:00
|
|
|
if (smc->sk.sk_state == SMC_INIT)
|
|
|
|
sock_put(&smc->sk); /* passive closing */
|
2017-01-09 08:55:16 -07:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2017-01-09 08:55:13 -07:00
|
|
|
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)
|
|
|
|
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);
|
2017-10-25 03:01:46 -06:00
|
|
|
tcp_sk(smc->clcsock->sk)->syn_smc = 1;
|
2017-01-09 08:55:13 -07:00
|
|
|
rc = kernel_connect(smc->clcsock, addr, alen, flags);
|
|
|
|
if (rc)
|
|
|
|
goto out;
|
|
|
|
|
2017-01-09 08:55:16 -07:00
|
|
|
/* setup RDMA connection */
|
|
|
|
rc = smc_connect_rdma(smc);
|
|
|
|
if (rc < 0)
|
|
|
|
goto out;
|
|
|
|
else
|
|
|
|
rc = 0; /* success cases including fallback */
|
2017-01-09 08:55:13 -07:00
|
|
|
|
|
|
|
out:
|
|
|
|
release_sock(sk);
|
|
|
|
out_err:
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
|
|
|
|
{
|
2018-01-24 02:28:12 -07:00
|
|
|
struct socket *new_clcsock = NULL;
|
|
|
|
struct sock *lsk = &lsmc->sk;
|
2017-01-09 08:55:13 -07:00
|
|
|
struct sock *new_sk;
|
|
|
|
int rc;
|
|
|
|
|
2018-01-24 02:28:12 -07:00
|
|
|
release_sock(lsk);
|
|
|
|
new_sk = smc_sock_alloc(sock_net(lsk), NULL);
|
2017-01-09 08:55:13 -07:00
|
|
|
if (!new_sk) {
|
|
|
|
rc = -ENOMEM;
|
2018-01-24 02:28:12 -07:00
|
|
|
lsk->sk_err = ENOMEM;
|
2017-01-09 08:55:13 -07:00
|
|
|
*new_smc = NULL;
|
2018-01-24 02:28:12 -07:00
|
|
|
lock_sock(lsk);
|
2017-01-09 08:55:13 -07:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
*new_smc = smc_sk(new_sk);
|
|
|
|
|
|
|
|
rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0);
|
2018-01-24 02:28:12 -07:00
|
|
|
lock_sock(lsk);
|
2018-01-24 02:28:13 -07:00
|
|
|
if (rc < 0)
|
2018-01-24 02:28:12 -07:00
|
|
|
lsk->sk_err = -rc;
|
2018-01-24 02:28:13 -07:00
|
|
|
if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
|
2017-01-09 08:55:16 -07:00
|
|
|
if (new_clcsock)
|
|
|
|
sock_release(new_clcsock);
|
|
|
|
new_sk->sk_state = SMC_CLOSED;
|
|
|
|
sock_set_flag(new_sk, SOCK_DEAD);
|
2018-01-24 02:28:12 -07:00
|
|
|
new_sk->sk_prot->unhash(new_sk);
|
2018-01-26 01:28:48 -07:00
|
|
|
sock_put(new_sk); /* final */
|
2017-01-09 08:55:13 -07:00
|
|
|
*new_smc = NULL;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
(*new_smc)->clcsock = new_clcsock;
|
|
|
|
out:
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2017-01-09 08:55:16 -07:00
|
|
|
/* 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);
|
|
|
|
|
2018-01-26 01:28:48 -07:00
|
|
|
sock_hold(sk); /* sock_put in smc_accept_unlink () */
|
2017-01-09 08:55:16 -07:00
|
|
|
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);
|
2018-01-26 01:28:48 -07:00
|
|
|
sock_put(sk); /* sock_hold in smc_accept_enqueue */
|
2017-01-09 08:55:16 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
/* remove a sock from the accept queue to bind it to a new socket created
|
|
|
|
* for a socket accept call from user space
|
|
|
|
*/
|
2017-01-09 08:55:25 -07:00
|
|
|
struct sock *smc_accept_dequeue(struct sock *parent,
|
|
|
|
struct socket *new_sock)
|
2017-01-09 08:55:16 -07:00
|
|
|
{
|
|
|
|
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) {
|
2018-01-26 01:28:49 -07:00
|
|
|
if (isk->clcsock) {
|
|
|
|
sock_release(isk->clcsock);
|
|
|
|
isk->clcsock = NULL;
|
|
|
|
}
|
2017-04-10 06:58:04 -06:00
|
|
|
new_sk->sk_prot->unhash(new_sk);
|
2018-01-26 01:28:48 -07:00
|
|
|
sock_put(new_sk); /* final */
|
2017-01-09 08:55:16 -07:00
|
|
|
continue;
|
|
|
|
}
|
|
|
|
if (new_sock)
|
|
|
|
sock_graft(new_sk, new_sock);
|
|
|
|
return new_sk;
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* clean up for a created but never accepted sock */
|
2017-01-09 08:55:25 -07:00
|
|
|
void smc_close_non_accepted(struct sock *sk)
|
2017-01-09 08:55:16 -07:00
|
|
|
{
|
|
|
|
struct smc_sock *smc = smc_sk(sk);
|
|
|
|
|
2017-01-09 08:55:25 -07:00
|
|
|
lock_sock(sk);
|
|
|
|
if (!sk->sk_lingertime)
|
|
|
|
/* wait for peer closing */
|
|
|
|
sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
|
2018-01-26 01:28:48 -07:00
|
|
|
if (!smc->use_fallback) {
|
2017-01-09 08:55:25 -07:00
|
|
|
smc_close_active(smc);
|
2017-04-10 06:58:04 -06:00
|
|
|
sock_set_flag(sk, SOCK_DEAD);
|
|
|
|
sk->sk_shutdown |= SHUTDOWN_MASK;
|
|
|
|
}
|
2017-01-09 08:55:16 -07:00
|
|
|
if (smc->clcsock) {
|
|
|
|
struct socket *tcp;
|
|
|
|
|
|
|
|
tcp = smc->clcsock;
|
|
|
|
smc->clcsock = NULL;
|
|
|
|
sock_release(tcp);
|
|
|
|
}
|
2017-01-09 08:55:25 -07:00
|
|
|
if (smc->use_fallback) {
|
2018-01-26 01:28:48 -07:00
|
|
|
sock_put(sk); /* passive closing */
|
|
|
|
sk->sk_state = SMC_CLOSED;
|
|
|
|
} else {
|
|
|
|
if (sk->sk_state == SMC_CLOSED)
|
|
|
|
smc_conn_free(&smc->conn);
|
2017-01-09 08:55:25 -07:00
|
|
|
}
|
|
|
|
release_sock(sk);
|
2018-01-26 01:28:48 -07:00
|
|
|
sk->sk_prot->unhash(sk);
|
|
|
|
sock_put(sk); /* final sock_put */
|
2017-01-09 08:55:16 -07:00
|
|
|
}
|
|
|
|
|
2017-01-09 08:55:21 -07:00
|
|
|
static int smc_serv_conf_first_link(struct smc_sock *smc)
|
|
|
|
{
|
|
|
|
struct smc_link_group *lgr = smc->conn.lgr;
|
|
|
|
struct smc_link *link;
|
|
|
|
int rest;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
link = &lgr->lnk[SMC_SINGLE_LINK];
|
2017-07-28 05:56:17 -06:00
|
|
|
|
|
|
|
rc = smc_wr_reg_send(link,
|
|
|
|
smc->conn.rmb_desc->mr_rx[SMC_SINGLE_LINK]);
|
|
|
|
if (rc)
|
|
|
|
return SMC_CLC_DECL_INTERR;
|
|
|
|
|
2017-01-09 08:55:21 -07:00
|
|
|
/* send CONFIRM LINK request to client over the RoCE fabric */
|
|
|
|
rc = smc_llc_send_confirm_link(link,
|
|
|
|
link->smcibdev->mac[link->ibport - 1],
|
|
|
|
&link->smcibdev->gid[link->ibport - 1],
|
|
|
|
SMC_LLC_REQ);
|
|
|
|
if (rc < 0)
|
|
|
|
return SMC_CLC_DECL_TCL;
|
|
|
|
|
|
|
|
/* 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);
|
|
|
|
}
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2017-01-09 08:55:16 -07:00
|
|
|
/* 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);
|
2017-12-07 05:38:49 -07:00
|
|
|
struct smc_clc_msg_proposal_prefix *pclc_prfx;
|
2017-01-09 08:55:16 -07:00
|
|
|
struct socket *newclcsock = new_smc->clcsock;
|
|
|
|
struct smc_sock *lsmc = new_smc->listen_smc;
|
|
|
|
struct smc_clc_msg_accept_confirm cclc;
|
2017-01-09 08:55:17 -07:00
|
|
|
int local_contact = SMC_REUSE_CONTACT;
|
2017-01-09 08:55:16 -07:00
|
|
|
struct sock *newsmcsk = &new_smc->sk;
|
2017-12-07 05:38:49 -07:00
|
|
|
struct smc_clc_msg_proposal *pclc;
|
2017-01-09 08:55:16 -07:00
|
|
|
struct smc_ib_device *smcibdev;
|
2017-12-07 05:38:49 -07:00
|
|
|
u8 buf[SMC_CLC_MAX_LEN];
|
2017-01-09 08:55:17 -07:00
|
|
|
struct smc_link *link;
|
2017-01-09 08:55:16 -07:00
|
|
|
int reason_code = 0;
|
2018-02-12 12:00:20 -07:00
|
|
|
int rc = 0;
|
2017-01-09 08:55:16 -07:00
|
|
|
__be32 subnet;
|
|
|
|
u8 prefix_len;
|
|
|
|
u8 ibport;
|
|
|
|
|
2017-10-25 03:01:46 -06:00
|
|
|
/* check if peer is smc capable */
|
|
|
|
if (!tcp_sk(newclcsock->sk)->syn_smc) {
|
|
|
|
new_smc->use_fallback = true;
|
|
|
|
goto out_connected;
|
|
|
|
}
|
|
|
|
|
2017-01-09 08:55:16 -07:00
|
|
|
/* do inband token exchange -
|
|
|
|
*wait for and receive SMC Proposal CLC message
|
|
|
|
*/
|
2017-12-07 05:38:49 -07:00
|
|
|
reason_code = smc_clc_wait_msg(new_smc, &buf, sizeof(buf),
|
2017-01-09 08:55:16 -07:00
|
|
|
SMC_CLC_PROPOSAL);
|
|
|
|
if (reason_code < 0)
|
|
|
|
goto out_err;
|
|
|
|
if (reason_code > 0)
|
|
|
|
goto decline_rdma;
|
|
|
|
|
|
|
|
/* IPSec connections opt out of SMC-R optimizations */
|
|
|
|
if (using_ipsec(new_smc)) {
|
|
|
|
reason_code = SMC_CLC_DECL_IPSEC;
|
|
|
|
goto decline_rdma;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* 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(newclcsock->sk, &smcibdev, &ibport);
|
|
|
|
if (!smcibdev) {
|
|
|
|
reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
|
|
|
|
goto decline_rdma;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* determine subnet and mask from internal TCP socket */
|
2018-03-01 05:51:27 -07:00
|
|
|
rc = smc_clc_netinfo_by_tcpsk(newclcsock, &subnet, &prefix_len);
|
2017-01-09 08:55:16 -07:00
|
|
|
if (rc) {
|
|
|
|
reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
|
|
|
|
goto decline_rdma;
|
|
|
|
}
|
2017-12-07 05:38:49 -07:00
|
|
|
|
|
|
|
pclc = (struct smc_clc_msg_proposal *)&buf;
|
|
|
|
pclc_prfx = smc_clc_proposal_get_prefix(pclc);
|
|
|
|
if (pclc_prfx->outgoing_subnet != subnet ||
|
|
|
|
pclc_prfx->prefix_len != prefix_len) {
|
2017-01-09 08:55:16 -07:00
|
|
|
reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
|
|
|
|
goto decline_rdma;
|
|
|
|
}
|
|
|
|
|
2017-01-09 08:55:17 -07:00
|
|
|
/* allocate connection / link group */
|
|
|
|
mutex_lock(&smc_create_lgr_pending);
|
2018-03-01 05:51:28 -07:00
|
|
|
local_contact = smc_conn_create(new_smc, smcibdev, ibport, &pclc->lcl,
|
|
|
|
0);
|
2017-01-09 08:55:17 -07:00
|
|
|
if (local_contact < 0) {
|
|
|
|
rc = local_contact;
|
|
|
|
if (rc == -ENOMEM)
|
|
|
|
reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
|
2017-10-25 03:01:44 -06:00
|
|
|
goto decline_rdma_unlock;
|
2017-01-09 08:55:17 -07:00
|
|
|
}
|
|
|
|
link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
|
2017-01-09 08:55:16 -07:00
|
|
|
|
2017-07-28 05:56:20 -06:00
|
|
|
/* create send buffer and rmb */
|
|
|
|
rc = smc_buf_create(new_smc);
|
2017-01-09 08:55:18 -07:00
|
|
|
if (rc) {
|
|
|
|
reason_code = SMC_CLC_DECL_MEM;
|
2017-10-25 03:01:44 -06:00
|
|
|
goto decline_rdma_unlock;
|
2017-01-09 08:55:18 -07:00
|
|
|
}
|
2017-01-09 08:55:16 -07:00
|
|
|
|
2017-04-10 06:58:01 -06:00
|
|
|
smc_close_init(new_smc);
|
|
|
|
smc_rx_init(new_smc);
|
|
|
|
|
2017-07-28 05:56:17 -06:00
|
|
|
if (local_contact != SMC_FIRST_CONTACT) {
|
|
|
|
struct smc_buf_desc *buf_desc = new_smc->conn.rmb_desc;
|
|
|
|
|
|
|
|
if (!buf_desc->reused) {
|
|
|
|
/* register memory region for new rmb */
|
|
|
|
rc = smc_wr_reg_send(link,
|
|
|
|
buf_desc->mr_rx[SMC_SINGLE_LINK]);
|
|
|
|
if (rc) {
|
|
|
|
reason_code = SMC_CLC_DECL_INTERR;
|
2017-10-25 03:01:44 -06:00
|
|
|
goto decline_rdma_unlock;
|
2017-07-28 05:56:17 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2017-07-28 05:56:22 -06:00
|
|
|
smc_rmb_sync_sg_for_device(&new_smc->conn);
|
2017-07-28 05:56:17 -06:00
|
|
|
|
2017-01-09 08:55:17 -07:00
|
|
|
rc = smc_clc_send_accept(new_smc, local_contact);
|
2017-01-09 08:55:16 -07:00
|
|
|
if (rc)
|
2017-10-25 03:01:44 -06:00
|
|
|
goto out_err_unlock;
|
2017-01-09 08:55:16 -07:00
|
|
|
|
|
|
|
/* receive SMC Confirm CLC message */
|
|
|
|
reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
|
|
|
|
SMC_CLC_CONFIRM);
|
|
|
|
if (reason_code < 0)
|
2017-10-25 03:01:44 -06:00
|
|
|
goto out_err_unlock;
|
2017-01-09 08:55:16 -07:00
|
|
|
if (reason_code > 0)
|
2017-10-25 03:01:44 -06:00
|
|
|
goto decline_rdma_unlock;
|
2017-01-09 08:55:17 -07:00
|
|
|
smc_conn_save_peer_info(new_smc, &cclc);
|
|
|
|
if (local_contact == SMC_FIRST_CONTACT)
|
|
|
|
smc_link_save_peer_info(link, &cclc);
|
2017-01-09 08:55:16 -07:00
|
|
|
|
2017-01-09 08:55:20 -07:00
|
|
|
rc = smc_rmb_rtoken_handling(&new_smc->conn, &cclc);
|
|
|
|
if (rc) {
|
|
|
|
reason_code = SMC_CLC_DECL_INTERR;
|
2017-10-25 03:01:44 -06:00
|
|
|
goto decline_rdma_unlock;
|
2017-01-09 08:55:20 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
if (local_contact == SMC_FIRST_CONTACT) {
|
|
|
|
rc = smc_ib_ready_link(link);
|
|
|
|
if (rc) {
|
|
|
|
reason_code = SMC_CLC_DECL_INTERR;
|
2017-10-25 03:01:44 -06:00
|
|
|
goto decline_rdma_unlock;
|
2017-01-09 08:55:20 -07:00
|
|
|
}
|
2017-01-09 08:55:21 -07:00
|
|
|
/* QP confirmation over RoCE fabric */
|
|
|
|
reason_code = smc_serv_conf_first_link(new_smc);
|
2017-12-07 05:38:45 -07:00
|
|
|
if (reason_code < 0)
|
2017-01-09 08:55:21 -07:00
|
|
|
/* peer is not aware of a problem */
|
2017-10-25 03:01:44 -06:00
|
|
|
goto out_err_unlock;
|
2017-01-09 08:55:21 -07:00
|
|
|
if (reason_code > 0)
|
2017-10-25 03:01:44 -06:00
|
|
|
goto decline_rdma_unlock;
|
2017-01-09 08:55:20 -07:00
|
|
|
}
|
2017-01-09 08:55:16 -07:00
|
|
|
|
2017-01-09 08:55:23 -07:00
|
|
|
smc_tx_init(new_smc);
|
2017-10-25 03:01:44 -06:00
|
|
|
mutex_unlock(&smc_create_lgr_pending);
|
2017-01-09 08:55:23 -07:00
|
|
|
|
2017-01-09 08:55:16 -07:00
|
|
|
out_connected:
|
|
|
|
sk_refcnt_debug_inc(newsmcsk);
|
2017-01-09 08:55:25 -07:00
|
|
|
if (newsmcsk->sk_state == SMC_INIT)
|
|
|
|
newsmcsk->sk_state = SMC_ACTIVE;
|
2017-01-09 08:55:16 -07:00
|
|
|
enqueue:
|
2017-01-09 08:55:25 -07:00
|
|
|
lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
|
2017-01-09 08:55:16 -07:00
|
|
|
if (lsmc->sk.sk_state == SMC_LISTEN) {
|
|
|
|
smc_accept_enqueue(&lsmc->sk, newsmcsk);
|
|
|
|
} else { /* no longer listening */
|
|
|
|
smc_close_non_accepted(newsmcsk);
|
|
|
|
}
|
|
|
|
release_sock(&lsmc->sk);
|
|
|
|
|
|
|
|
/* Wake up accept */
|
|
|
|
lsmc->sk.sk_data_ready(&lsmc->sk);
|
|
|
|
sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
|
|
|
|
return;
|
|
|
|
|
2017-10-25 03:01:44 -06:00
|
|
|
decline_rdma_unlock:
|
2018-01-25 03:15:34 -07:00
|
|
|
if (local_contact == SMC_FIRST_CONTACT)
|
|
|
|
smc_lgr_forget(new_smc->conn.lgr);
|
2017-10-25 03:01:44 -06:00
|
|
|
mutex_unlock(&smc_create_lgr_pending);
|
2017-01-09 08:55:16 -07:00
|
|
|
decline_rdma:
|
|
|
|
/* RDMA setup failed, switch back to TCP */
|
2017-01-09 08:55:17 -07:00
|
|
|
smc_conn_free(&new_smc->conn);
|
2017-01-09 08:55:16 -07:00
|
|
|
new_smc->use_fallback = true;
|
|
|
|
if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) {
|
2017-12-07 05:38:45 -07:00
|
|
|
if (smc_clc_send_decline(new_smc, reason_code) < 0)
|
2017-01-09 08:55:16 -07:00
|
|
|
goto out_err;
|
|
|
|
}
|
|
|
|
goto out_connected;
|
|
|
|
|
2017-10-25 03:01:44 -06:00
|
|
|
out_err_unlock:
|
2018-01-25 03:15:34 -07:00
|
|
|
if (local_contact == SMC_FIRST_CONTACT)
|
|
|
|
smc_lgr_forget(new_smc->conn.lgr);
|
2017-10-25 03:01:44 -06:00
|
|
|
mutex_unlock(&smc_create_lgr_pending);
|
2017-01-09 08:55:16 -07:00
|
|
|
out_err:
|
2018-01-26 01:28:48 -07:00
|
|
|
if (newsmcsk->sk_state == SMC_INIT)
|
|
|
|
sock_put(&new_smc->sk); /* passive closing */
|
2017-01-09 08:55:16 -07:00
|
|
|
newsmcsk->sk_state = SMC_CLOSED;
|
2017-01-09 08:55:25 -07:00
|
|
|
smc_conn_free(&new_smc->conn);
|
2017-01-09 08:55:16 -07:00
|
|
|
goto enqueue; /* queue new sock with sk_err set */
|
|
|
|
}
|
|
|
|
|
|
|
|
static void smc_tcp_listen_work(struct work_struct *work)
|
|
|
|
{
|
|
|
|
struct smc_sock *lsmc = container_of(work, struct smc_sock,
|
|
|
|
tcp_listen_work);
|
2018-01-24 02:28:12 -07:00
|
|
|
struct sock *lsk = &lsmc->sk;
|
2017-01-09 08:55:16 -07:00
|
|
|
struct smc_sock *new_smc;
|
|
|
|
int rc = 0;
|
|
|
|
|
2018-01-24 02:28:12 -07:00
|
|
|
lock_sock(lsk);
|
|
|
|
while (lsk->sk_state == SMC_LISTEN) {
|
2017-01-09 08:55:16 -07:00
|
|
|
rc = smc_clcsock_accept(lsmc, &new_smc);
|
|
|
|
if (rc)
|
|
|
|
goto out;
|
|
|
|
if (!new_smc)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
new_smc->listen_smc = lsmc;
|
|
|
|
new_smc->use_fallback = false; /* assume rdma capability first*/
|
2018-01-24 02:28:12 -07:00
|
|
|
sock_hold(lsk); /* sock_put in smc_listen_work */
|
2017-01-09 08:55:16 -07:00
|
|
|
INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
|
|
|
|
smc_copy_sock_settings_to_smc(new_smc);
|
2018-01-26 01:28:48 -07:00
|
|
|
sock_hold(&new_smc->sk); /* sock_put in passive closing */
|
|
|
|
if (!schedule_work(&new_smc->smc_listen_work))
|
|
|
|
sock_put(&new_smc->sk);
|
2017-01-09 08:55:16 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
2018-01-26 01:28:49 -07:00
|
|
|
if (lsmc->clcsock) {
|
|
|
|
sock_release(lsmc->clcsock);
|
|
|
|
lsmc->clcsock = NULL;
|
|
|
|
}
|
2018-01-24 02:28:12 -07:00
|
|
|
release_sock(lsk);
|
2018-01-26 01:28:49 -07:00
|
|
|
/* no more listening, wake up smc_close_wait_listen_clcsock and
|
|
|
|
* accept
|
|
|
|
*/
|
|
|
|
lsk->sk_state_change(lsk);
|
2018-01-26 01:28:48 -07:00
|
|
|
sock_put(&lsmc->sk); /* sock_hold in smc_listen */
|
2017-01-09 08:55:16 -07:00
|
|
|
}
|
|
|
|
|
2017-01-09 08:55:13 -07:00
|
|
|
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))
|
|
|
|
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);
|
2017-10-25 03:01:46 -06:00
|
|
|
tcp_sk(smc->clcsock->sk)->syn_smc = 1;
|
2017-01-09 08:55:13 -07:00
|
|
|
|
|
|
|
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;
|
2017-01-09 08:55:16 -07:00
|
|
|
INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
|
2018-01-26 01:28:48 -07:00
|
|
|
sock_hold(sk); /* sock_hold in tcp_listen_worker */
|
|
|
|
if (!schedule_work(&smc->tcp_listen_work))
|
|
|
|
sock_put(sk);
|
2017-01-09 08:55:13 -07:00
|
|
|
|
|
|
|
out:
|
|
|
|
release_sock(sk);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int smc_accept(struct socket *sock, struct socket *new_sock,
|
2017-03-09 01:09:05 -07:00
|
|
|
int flags, bool kern)
|
2017-01-09 08:55:13 -07:00
|
|
|
{
|
2017-01-09 08:55:16 -07:00
|
|
|
struct sock *sk = sock->sk, *nsk;
|
|
|
|
DECLARE_WAITQUEUE(wait, current);
|
2017-01-09 08:55:13 -07:00
|
|
|
struct smc_sock *lsmc;
|
2017-01-09 08:55:16 -07:00
|
|
|
long timeo;
|
|
|
|
int rc = 0;
|
2017-01-09 08:55:13 -07:00
|
|
|
|
|
|
|
lsmc = smc_sk(sk);
|
2018-01-26 01:28:48 -07:00
|
|
|
sock_hold(sk); /* sock_put below */
|
2017-01-09 08:55:13 -07:00
|
|
|
lock_sock(sk);
|
|
|
|
|
|
|
|
if (lsmc->sk.sk_state != SMC_LISTEN) {
|
|
|
|
rc = -EINVAL;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2017-01-09 08:55:16 -07:00
|
|
|
/* 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);
|
2017-01-09 08:55:13 -07:00
|
|
|
|
2017-01-09 08:55:16 -07:00
|
|
|
if (!rc)
|
|
|
|
rc = sock_error(nsk);
|
2017-01-09 08:55:13 -07:00
|
|
|
|
|
|
|
out:
|
|
|
|
release_sock(sk);
|
2018-01-26 01:28:48 -07:00
|
|
|
sock_put(sk); /* sock_hold above */
|
2017-01-09 08:55:13 -07:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int smc_getname(struct socket *sock, struct sockaddr *addr,
|
2018-02-12 12:00:20 -07:00
|
|
|
int peer)
|
2017-01-09 08:55:13 -07:00
|
|
|
{
|
|
|
|
struct smc_sock *smc;
|
|
|
|
|
2017-01-09 08:55:25 -07:00
|
|
|
if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
|
|
|
|
(sock->sk->sk_state != SMC_APPCLOSEWAIT1))
|
2017-01-09 08:55:13 -07:00
|
|
|
return -ENOTCONN;
|
|
|
|
|
|
|
|
smc = smc_sk(sock->sk);
|
|
|
|
|
2018-02-12 12:00:20 -07:00
|
|
|
return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
|
2017-01-09 08:55:13 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
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);
|
2017-01-09 08:55:25 -07:00
|
|
|
if ((sk->sk_state != SMC_ACTIVE) &&
|
|
|
|
(sk->sk_state != SMC_APPCLOSEWAIT1) &&
|
|
|
|
(sk->sk_state != SMC_INIT))
|
2017-01-09 08:55:13 -07:00
|
|
|
goto out;
|
|
|
|
if (smc->use_fallback)
|
|
|
|
rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
|
|
|
|
else
|
2017-01-09 08:55:23 -07:00
|
|
|
rc = smc_tx_sendmsg(smc, msg, len);
|
2017-01-09 08:55:13 -07:00
|
|
|
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);
|
2017-01-09 08:55:25 -07:00
|
|
|
if ((sk->sk_state == SMC_INIT) ||
|
|
|
|
(sk->sk_state == SMC_LISTEN) ||
|
|
|
|
(sk->sk_state == SMC_CLOSED))
|
2017-01-09 08:55:13 -07:00
|
|
|
goto out;
|
|
|
|
|
2017-01-09 08:55:25 -07:00
|
|
|
if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
|
|
|
|
rc = 0;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2017-01-09 08:55:13 -07:00
|
|
|
if (smc->use_fallback)
|
|
|
|
rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
|
|
|
|
else
|
2017-01-09 08:55:24 -07:00
|
|
|
rc = smc_rx_recvmsg(smc, msg, len, flags);
|
2017-01-09 08:55:25 -07:00
|
|
|
|
2017-01-09 08:55:13 -07:00
|
|
|
out:
|
|
|
|
release_sock(sk);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2017-07-02 22:01:49 -06:00
|
|
|
static __poll_t smc_accept_poll(struct sock *parent)
|
2017-01-09 08:55:16 -07:00
|
|
|
{
|
2018-01-26 01:28:47 -07:00
|
|
|
struct smc_sock *isk = smc_sk(parent);
|
2018-02-01 08:02:53 -07:00
|
|
|
__poll_t mask = 0;
|
2017-01-09 08:55:16 -07:00
|
|
|
|
2018-01-26 01:28:47 -07:00
|
|
|
spin_lock(&isk->accept_q_lock);
|
|
|
|
if (!list_empty(&isk->accept_q))
|
2018-02-11 15:34:03 -07:00
|
|
|
mask = EPOLLIN | EPOLLRDNORM;
|
2018-01-26 01:28:47 -07:00
|
|
|
spin_unlock(&isk->accept_q_lock);
|
2017-01-09 08:55:16 -07:00
|
|
|
|
2018-01-26 01:28:47 -07:00
|
|
|
return mask;
|
2017-01-09 08:55:16 -07:00
|
|
|
}
|
|
|
|
|
2017-07-02 22:01:49 -06:00
|
|
|
static __poll_t smc_poll(struct file *file, struct socket *sock,
|
2017-01-09 08:55:13 -07:00
|
|
|
poll_table *wait)
|
|
|
|
{
|
|
|
|
struct sock *sk = sock->sk;
|
2017-07-03 20:25:56 -06:00
|
|
|
__poll_t mask = 0;
|
2017-01-09 08:55:13 -07:00
|
|
|
struct smc_sock *smc;
|
2017-01-09 08:55:16 -07:00
|
|
|
int rc;
|
2017-01-09 08:55:13 -07:00
|
|
|
|
2018-01-26 01:28:47 -07:00
|
|
|
if (!sk)
|
2018-02-11 15:34:03 -07:00
|
|
|
return EPOLLNVAL;
|
2018-01-26 01:28:47 -07:00
|
|
|
|
2017-01-09 08:55:13 -07:00
|
|
|
smc = smc_sk(sock->sk);
|
2018-01-26 01:28:47 -07:00
|
|
|
sock_hold(sk);
|
|
|
|
lock_sock(sk);
|
2017-01-09 08:55:16 -07:00
|
|
|
if ((sk->sk_state == SMC_INIT) || smc->use_fallback) {
|
|
|
|
/* delegate to CLC child sock */
|
2018-01-26 01:28:47 -07:00
|
|
|
release_sock(sk);
|
2017-01-09 08:55:13 -07:00
|
|
|
mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
|
|
|
|
/* if non-blocking connect finished ... */
|
|
|
|
lock_sock(sk);
|
2018-02-11 15:34:03 -07:00
|
|
|
if ((sk->sk_state == SMC_INIT) && (mask & EPOLLOUT)) {
|
2017-01-09 08:55:16 -07:00
|
|
|
sk->sk_err = smc->clcsock->sk->sk_err;
|
|
|
|
if (sk->sk_err) {
|
2018-02-11 15:34:03 -07:00
|
|
|
mask |= EPOLLERR;
|
2017-01-09 08:55:16 -07:00
|
|
|
} else {
|
|
|
|
rc = smc_connect_rdma(smc);
|
|
|
|
if (rc < 0)
|
2018-02-11 15:34:03 -07:00
|
|
|
mask |= EPOLLERR;
|
2018-01-26 01:28:47 -07:00
|
|
|
/* success cases including fallback */
|
2018-02-11 15:34:03 -07:00
|
|
|
mask |= EPOLLOUT | EPOLLWRNORM;
|
2017-01-09 08:55:16 -07:00
|
|
|
}
|
2017-01-09 08:55:13 -07:00
|
|
|
}
|
|
|
|
} else {
|
2018-01-26 01:28:47 -07:00
|
|
|
if (sk->sk_state != SMC_CLOSED) {
|
|
|
|
release_sock(sk);
|
|
|
|
sock_poll_wait(file, sk_sleep(sk), wait);
|
|
|
|
lock_sock(sk);
|
|
|
|
}
|
2017-01-09 08:55:16 -07:00
|
|
|
if (sk->sk_err)
|
2018-02-11 15:34:03 -07:00
|
|
|
mask |= EPOLLERR;
|
2017-01-09 08:55:25 -07:00
|
|
|
if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
|
|
|
|
(sk->sk_state == SMC_CLOSED))
|
2018-02-11 15:34:03 -07:00
|
|
|
mask |= EPOLLHUP;
|
2018-01-26 01:28:47 -07:00
|
|
|
if (sk->sk_state == SMC_LISTEN) {
|
|
|
|
/* woken up by sk_data_ready in smc_listen_work() */
|
|
|
|
mask = smc_accept_poll(sk);
|
|
|
|
} else {
|
|
|
|
if (atomic_read(&smc->conn.sndbuf_space) ||
|
|
|
|
sk->sk_shutdown & SEND_SHUTDOWN) {
|
2018-02-11 15:34:03 -07:00
|
|
|
mask |= EPOLLOUT | EPOLLWRNORM;
|
2018-01-26 01:28:47 -07:00
|
|
|
} else {
|
|
|
|
sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
|
|
|
|
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
|
|
|
|
}
|
|
|
|
if (atomic_read(&smc->conn.bytes_to_rcv))
|
2018-02-11 15:34:03 -07:00
|
|
|
mask |= EPOLLIN | EPOLLRDNORM;
|
2018-01-26 01:28:47 -07:00
|
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
2018-02-11 15:34:03 -07:00
|
|
|
mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
|
2018-01-26 01:28:47 -07:00
|
|
|
if (sk->sk_state == SMC_APPCLOSEWAIT1)
|
2018-02-11 15:34:03 -07:00
|
|
|
mask |= EPOLLIN;
|
2018-01-26 01:28:47 -07:00
|
|
|
}
|
2017-01-09 08:55:25 -07:00
|
|
|
|
2017-01-09 08:55:13 -07:00
|
|
|
}
|
2018-01-26 01:28:47 -07:00
|
|
|
release_sock(sk);
|
|
|
|
sock_put(sk);
|
2017-01-09 08:55:13 -07:00
|
|
|
|
|
|
|
return mask;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int smc_shutdown(struct socket *sock, int how)
|
|
|
|
{
|
|
|
|
struct sock *sk = sock->sk;
|
|
|
|
struct smc_sock *smc;
|
|
|
|
int rc = -EINVAL;
|
2017-01-09 08:55:25 -07:00
|
|
|
int rc1 = 0;
|
2017-01-09 08:55:13 -07:00
|
|
|
|
|
|
|
smc = smc_sk(sk);
|
|
|
|
|
|
|
|
if ((how < SHUT_RD) || (how > SHUT_RDWR))
|
2017-01-09 08:55:25 -07:00
|
|
|
return rc;
|
2017-01-09 08:55:13 -07:00
|
|
|
|
|
|
|
lock_sock(sk);
|
|
|
|
|
|
|
|
rc = -ENOTCONN;
|
2017-01-09 08:55:25 -07:00
|
|
|
if ((sk->sk_state != SMC_LISTEN) &&
|
|
|
|
(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))
|
2017-01-09 08:55:13 -07:00
|
|
|
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;
|
2017-01-09 08:55:25 -07:00
|
|
|
goto out;
|
2017-01-09 08:55:13 -07:00
|
|
|
}
|
2017-01-09 08:55:25 -07:00
|
|
|
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:
|
|
|
|
if (sk->sk_state == SMC_LISTEN)
|
|
|
|
rc = smc_close_active(smc);
|
|
|
|
else
|
|
|
|
rc = 0;
|
|
|
|
/* nothing more to do because peer is not involved */
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
rc1 = kernel_sock_shutdown(smc->clcsock, how);
|
|
|
|
/* map sock_shutdown_cmd constants to sk_shutdown value range */
|
|
|
|
sk->sk_shutdown |= how + 1;
|
2017-01-09 08:55:13 -07:00
|
|
|
|
|
|
|
out:
|
|
|
|
release_sock(sk);
|
2017-01-09 08:55:25 -07:00
|
|
|
return rc ? rc : rc1;
|
2017-01-09 08:55:13 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
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;
|
|
|
|
|
|
|
|
smc = smc_sk(sk);
|
|
|
|
|
|
|
|
/* generic setsockopts reaching us here always apply to the
|
|
|
|
* CLC socket
|
|
|
|
*/
|
|
|
|
return smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
|
|
|
|
optval, optlen);
|
|
|
|
}
|
|
|
|
|
|
|
|
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)
|
|
|
|
{
|
|
|
|
struct smc_sock *smc;
|
|
|
|
|
|
|
|
smc = smc_sk(sock->sk);
|
|
|
|
if (smc->use_fallback)
|
|
|
|
return smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
|
|
|
|
else
|
|
|
|
return sock_no_ioctl(sock, cmd, 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)
|
|
|
|
goto out;
|
|
|
|
if (smc->use_fallback)
|
|
|
|
rc = kernel_sendpage(smc->clcsock, page, offset,
|
|
|
|
size, flags);
|
|
|
|
else
|
|
|
|
rc = sock_no_sendpage(sock, page, offset, size, flags);
|
|
|
|
|
|
|
|
out:
|
|
|
|
release_sock(sk);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
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_ACTIVE) && (sk->sk_state != SMC_CLOSED))
|
|
|
|
goto out;
|
|
|
|
if (smc->use_fallback) {
|
|
|
|
rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
|
|
|
|
pipe, len, flags);
|
|
|
|
} else {
|
|
|
|
rc = -EOPNOTSUPP;
|
|
|
|
}
|
|
|
|
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)
|
|
|
|
{
|
|
|
|
struct smc_sock *smc;
|
|
|
|
struct sock *sk;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
rc = -ESOCKTNOSUPPORT;
|
|
|
|
if (sock->type != SOCK_STREAM)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
rc = -EPROTONOSUPPORT;
|
|
|
|
if ((protocol != IPPROTO_IP) && (protocol != IPPROTO_TCP))
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
rc = -ENOBUFS;
|
|
|
|
sock->ops = &smc_sock_ops;
|
|
|
|
sk = smc_sock_alloc(net, sock);
|
|
|
|
if (!sk)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
/* create internal TCP socket for CLC handshake and fallback */
|
|
|
|
smc = smc_sk(sk);
|
2017-01-09 08:55:16 -07:00
|
|
|
smc->use_fallback = false; /* assume rdma capability first */
|
2017-01-09 08:55:13 -07:00
|
|
|
rc = sock_create_kern(net, PF_INET, SOCK_STREAM,
|
|
|
|
IPPROTO_TCP, &smc->clcsock);
|
|
|
|
if (rc)
|
|
|
|
sk_common_release(sk);
|
2017-01-09 08:55:18 -07:00
|
|
|
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);
|
2017-01-09 08:55:13 -07:00
|
|
|
|
|
|
|
out:
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct net_proto_family smc_sock_family_ops = {
|
|
|
|
.family = PF_SMC,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.create = smc_create,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init smc_init(void)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
|
2017-01-09 08:55:15 -07:00
|
|
|
rc = smc_pnet_init();
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
|
2017-01-09 08:55:21 -07:00
|
|
|
rc = smc_llc_init();
|
|
|
|
if (rc) {
|
|
|
|
pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
|
|
|
|
goto out_pnet;
|
|
|
|
}
|
|
|
|
|
2017-01-09 08:55:22 -07:00
|
|
|
rc = smc_cdc_init();
|
|
|
|
if (rc) {
|
|
|
|
pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
|
|
|
|
goto out_pnet;
|
|
|
|
}
|
|
|
|
|
2017-01-09 08:55:13 -07:00
|
|
|
rc = proto_register(&smc_proto, 1);
|
|
|
|
if (rc) {
|
|
|
|
pr_err("%s: proto_register fails with %d\n", __func__, rc);
|
2017-01-09 08:55:15 -07:00
|
|
|
goto out_pnet;
|
2017-01-09 08:55:13 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
rc = sock_register(&smc_sock_family_ops);
|
|
|
|
if (rc) {
|
|
|
|
pr_err("%s: sock_register fails with %d\n", __func__, rc);
|
|
|
|
goto out_proto;
|
|
|
|
}
|
2017-01-09 08:55:26 -07:00
|
|
|
INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
|
2017-01-09 08:55:13 -07:00
|
|
|
|
2017-01-09 08:55:14 -07:00
|
|
|
rc = smc_ib_register_client();
|
|
|
|
if (rc) {
|
|
|
|
pr_err("%s: ib_register fails with %d\n", __func__, rc);
|
|
|
|
goto out_sock;
|
|
|
|
}
|
|
|
|
|
2017-10-25 03:01:46 -06:00
|
|
|
static_branch_enable(&tcp_have_smc);
|
2017-01-09 08:55:13 -07:00
|
|
|
return 0;
|
|
|
|
|
2017-01-09 08:55:14 -07:00
|
|
|
out_sock:
|
|
|
|
sock_unregister(PF_SMC);
|
2017-01-09 08:55:13 -07:00
|
|
|
out_proto:
|
|
|
|
proto_unregister(&smc_proto);
|
2017-01-09 08:55:15 -07:00
|
|
|
out_pnet:
|
|
|
|
smc_pnet_exit();
|
2017-01-09 08:55:13 -07:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit smc_exit(void)
|
|
|
|
{
|
2017-01-09 08:55:17 -07:00
|
|
|
struct smc_link_group *lgr, *lg;
|
|
|
|
LIST_HEAD(lgr_freeing_list);
|
|
|
|
|
|
|
|
spin_lock_bh(&smc_lgr_list.lock);
|
|
|
|
if (!list_empty(&smc_lgr_list.list))
|
|
|
|
list_splice_init(&smc_lgr_list.list, &lgr_freeing_list);
|
|
|
|
spin_unlock_bh(&smc_lgr_list.lock);
|
|
|
|
list_for_each_entry_safe(lgr, lg, &lgr_freeing_list, list) {
|
|
|
|
list_del_init(&lgr->list);
|
|
|
|
smc_lgr_free(lgr); /* free link group */
|
|
|
|
}
|
2017-10-25 03:01:46 -06:00
|
|
|
static_branch_disable(&tcp_have_smc);
|
2017-01-09 08:55:14 -07:00
|
|
|
smc_ib_unregister_client();
|
2017-01-09 08:55:13 -07:00
|
|
|
sock_unregister(PF_SMC);
|
|
|
|
proto_unregister(&smc_proto);
|
2017-01-09 08:55:15 -07:00
|
|
|
smc_pnet_exit();
|
2017-01-09 08:55:13 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
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);
|