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2609 lines
65 KiB
2609 lines
65 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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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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* Initial restrictions: |
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* - support for alternate links postponed |
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* |
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* Copyright IBM Corp. 2016, 2018 |
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* |
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* Author(s): Ursula Braun <[email protected]> |
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* based on prototype from Frank Blaschka |
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*/ |
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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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|
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#include <linux/module.h> |
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#include <linux/socket.h> |
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#include <linux/workqueue.h> |
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#include <linux/in.h> |
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#include <linux/sched/signal.h> |
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#include <linux/if_vlan.h> |
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#include <linux/rcupdate_wait.h> |
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#include <linux/ctype.h> |
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|
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#include <net/sock.h> |
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#include <net/tcp.h> |
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#include <net/smc.h> |
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#include <asm/ioctls.h> |
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|
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#include <net/net_namespace.h> |
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#include <net/netns/generic.h> |
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#include "smc_netns.h" |
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|
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#include "smc.h" |
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#include "smc_clc.h" |
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#include "smc_llc.h" |
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#include "smc_cdc.h" |
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#include "smc_core.h" |
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#include "smc_ib.h" |
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#include "smc_ism.h" |
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#include "smc_pnet.h" |
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#include "smc_netlink.h" |
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#include "smc_tx.h" |
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#include "smc_rx.h" |
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#include "smc_close.h" |
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|
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static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group |
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* creation on server |
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*/ |
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static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group |
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* creation on client |
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*/ |
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|
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struct workqueue_struct *smc_hs_wq; /* wq for handshake work */ |
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struct workqueue_struct *smc_close_wq; /* wq for close work */ |
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|
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static void smc_tcp_listen_work(struct work_struct *); |
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static void smc_connect_work(struct work_struct *); |
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|
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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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|
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smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val); |
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} |
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|
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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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|
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static struct smc_hashinfo smc_v6_hashinfo = { |
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.lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock), |
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}; |
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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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|
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head = &h->ht; |
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|
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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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|
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(smc_hash_sk); |
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|
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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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|
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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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|
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struct proto smc_proto = { |
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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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.hash = smc_hash_sk, |
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.unhash = smc_unhash_sk, |
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.obj_size = sizeof(struct smc_sock), |
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.h.smc_hash = &smc_v4_hashinfo, |
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.slab_flags = SLAB_TYPESAFE_BY_RCU, |
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}; |
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EXPORT_SYMBOL_GPL(smc_proto); |
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|
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struct proto smc_proto6 = { |
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.name = "SMC6", |
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.owner = THIS_MODULE, |
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.keepalive = smc_set_keepalive, |
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.hash = smc_hash_sk, |
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.unhash = smc_unhash_sk, |
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.obj_size = sizeof(struct smc_sock), |
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.h.smc_hash = &smc_v6_hashinfo, |
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.slab_flags = SLAB_TYPESAFE_BY_RCU, |
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}; |
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EXPORT_SYMBOL_GPL(smc_proto6); |
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|
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static void smc_restore_fallback_changes(struct smc_sock *smc) |
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{ |
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if (smc->clcsock->file) { /* non-accepted sockets have no file yet */ |
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smc->clcsock->file->private_data = smc->sk.sk_socket; |
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smc->clcsock->file = NULL; |
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} |
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} |
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|
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static int __smc_release(struct smc_sock *smc) |
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{ |
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struct sock *sk = &smc->sk; |
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int rc = 0; |
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|
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if (!smc->use_fallback) { |
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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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} else { |
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if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT) |
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sock_put(sk); /* passive closing */ |
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if (sk->sk_state == SMC_LISTEN) { |
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/* wake up clcsock accept */ |
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rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR); |
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} |
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sk->sk_state = SMC_CLOSED; |
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sk->sk_state_change(sk); |
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smc_restore_fallback_changes(smc); |
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} |
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|
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sk->sk_prot->unhash(sk); |
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|
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if (sk->sk_state == SMC_CLOSED) { |
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if (smc->clcsock) { |
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release_sock(sk); |
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smc_clcsock_release(smc); |
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lock_sock(sk); |
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} |
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if (!smc->use_fallback) |
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smc_conn_free(&smc->conn); |
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} |
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|
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return rc; |
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} |
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|
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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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int rc = 0; |
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|
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if (!sk) |
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goto out; |
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|
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sock_hold(sk); /* sock_put below */ |
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smc = smc_sk(sk); |
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|
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/* cleanup for a dangling non-blocking connect */ |
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if (smc->connect_nonblock && sk->sk_state == SMC_INIT) |
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tcp_abort(smc->clcsock->sk, ECONNABORTED); |
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flush_work(&smc->connect_work); |
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|
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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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|
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rc = __smc_release(smc); |
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|
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/* detach socket */ |
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sock_orphan(sk); |
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sock->sk = NULL; |
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release_sock(sk); |
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|
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sock_put(sk); /* sock_hold above */ |
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sock_put(sk); /* final sock_put */ |
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out: |
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return rc; |
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} |
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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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|
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sk_refcnt_debug_dec(sk); |
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} |
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|
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static struct sock *smc_sock_alloc(struct net *net, struct socket *sock, |
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int protocol) |
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{ |
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struct smc_sock *smc; |
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struct proto *prot; |
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struct sock *sk; |
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|
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prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto; |
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sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0); |
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if (!sk) |
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return NULL; |
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|
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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 = protocol; |
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smc = smc_sk(sk); |
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INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); |
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INIT_WORK(&smc->connect_work, smc_connect_work); |
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INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_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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spin_lock_init(&smc->conn.send_lock); |
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sk->sk_prot->hash(sk); |
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sk_refcnt_debug_inc(sk); |
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mutex_init(&smc->clcsock_release_lock); |
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|
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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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|
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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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|
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rc = -EAFNOSUPPORT; |
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if (addr->sin_family != AF_INET && |
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addr->sin_family != AF_INET6 && |
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addr->sin_family != AF_UNSPEC) |
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goto out; |
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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_UNSPEC && |
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addr->sin_addr.s_addr != htonl(INADDR_ANY)) |
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goto out; |
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|
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lock_sock(sk); |
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|
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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 || smc->connect_nonblock) |
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goto out_rel; |
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|
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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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|
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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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|
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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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|
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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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|
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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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(1UL << SOCK_TSTAMP_NEW)) |
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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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smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC); |
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} |
|
|
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/* register the new rmb on all links */ |
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static int smcr_lgr_reg_rmbs(struct smc_link *link, |
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struct smc_buf_desc *rmb_desc) |
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{ |
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struct smc_link_group *lgr = link->lgr; |
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int i, rc = 0; |
|
|
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rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY); |
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if (rc) |
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return rc; |
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/* protect against parallel smc_llc_cli_rkey_exchange() and |
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* parallel smcr_link_reg_rmb() |
|
*/ |
|
mutex_lock(&lgr->llc_conf_mutex); |
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for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { |
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if (!smc_link_active(&lgr->lnk[i])) |
|
continue; |
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rc = smcr_link_reg_rmb(&lgr->lnk[i], rmb_desc); |
|
if (rc) |
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goto out; |
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} |
|
|
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/* exchange confirm_rkey msg with peer */ |
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rc = smc_llc_do_confirm_rkey(link, rmb_desc); |
|
if (rc) { |
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rc = -EFAULT; |
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goto out; |
|
} |
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rmb_desc->is_conf_rkey = true; |
|
out: |
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mutex_unlock(&lgr->llc_conf_mutex); |
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smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); |
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return rc; |
|
} |
|
|
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static int smcr_clnt_conf_first_link(struct smc_sock *smc) |
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{ |
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struct smc_link *link = smc->conn.lnk; |
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struct smc_llc_qentry *qentry; |
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int rc; |
|
|
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/* receive CONFIRM LINK request from server over RoCE fabric */ |
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qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME, |
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SMC_LLC_CONFIRM_LINK); |
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if (!qentry) { |
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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, CLC_WAIT_TIME_SHORT); |
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return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; |
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} |
|
smc_llc_save_peer_uid(qentry); |
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rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ); |
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smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); |
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if (rc) |
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return SMC_CLC_DECL_RMBE_EC; |
|
|
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rc = smc_ib_modify_qp_rts(link); |
|
if (rc) |
|
return SMC_CLC_DECL_ERR_RDYLNK; |
|
|
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smc_wr_remember_qp_attr(link); |
|
|
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if (smcr_link_reg_rmb(link, smc->conn.rmb_desc)) |
|
return SMC_CLC_DECL_ERR_REGRMB; |
|
|
|
/* confirm_rkey is implicit on 1st contact */ |
|
smc->conn.rmb_desc->is_conf_rkey = true; |
|
|
|
/* send CONFIRM LINK response over RoCE fabric */ |
|
rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP); |
|
if (rc < 0) |
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return SMC_CLC_DECL_TIMEOUT_CL; |
|
|
|
smc_llc_link_active(link); |
|
smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); |
|
|
|
/* optional 2nd link, receive ADD LINK request from server */ |
|
qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME, |
|
SMC_LLC_ADD_LINK); |
|
if (!qentry) { |
|
struct smc_clc_msg_decline dclc; |
|
|
|
rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), |
|
SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); |
|
if (rc == -EAGAIN) |
|
rc = 0; /* no DECLINE received, go with one link */ |
|
return rc; |
|
} |
|
smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl); |
|
smc_llc_cli_add_link(link, qentry); |
|
return 0; |
|
} |
|
|
|
static void smcr_conn_save_peer_info(struct smc_sock *smc, |
|
struct smc_clc_msg_accept_confirm *clc) |
|
{ |
|
int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size); |
|
|
|
smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx; |
|
smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token); |
|
smc->conn.peer_rmbe_size = bufsize; |
|
atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); |
|
smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1); |
|
} |
|
|
|
static bool smc_isascii(char *hostname) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++) |
|
if (!isascii(hostname[i])) |
|
return false; |
|
return true; |
|
} |
|
|
|
static void smcd_conn_save_peer_info(struct smc_sock *smc, |
|
struct smc_clc_msg_accept_confirm *clc) |
|
{ |
|
int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size); |
|
|
|
smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx; |
|
smc->conn.peer_token = clc->d0.token; |
|
/* msg header takes up space in the buffer */ |
|
smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg); |
|
atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); |
|
smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx; |
|
if (clc->hdr.version > SMC_V1 && |
|
(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) { |
|
struct smc_clc_msg_accept_confirm_v2 *clc_v2 = |
|
(struct smc_clc_msg_accept_confirm_v2 *)clc; |
|
struct smc_clc_first_contact_ext *fce = |
|
(struct smc_clc_first_contact_ext *) |
|
(((u8 *)clc_v2) + sizeof(*clc_v2)); |
|
|
|
memcpy(smc->conn.lgr->negotiated_eid, clc_v2->eid, |
|
SMC_MAX_EID_LEN); |
|
smc->conn.lgr->peer_os = fce->os_type; |
|
smc->conn.lgr->peer_smc_release = fce->release; |
|
if (smc_isascii(fce->hostname)) |
|
memcpy(smc->conn.lgr->peer_hostname, fce->hostname, |
|
SMC_MAX_HOSTNAME_LEN); |
|
} |
|
} |
|
|
|
static void 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->r0.qpn); |
|
memcpy(link->peer_gid, clc->r0.lcl.gid, SMC_GID_SIZE); |
|
memcpy(link->peer_mac, clc->r0.lcl.mac, sizeof(link->peer_mac)); |
|
link->peer_psn = ntoh24(clc->r0.psn); |
|
link->peer_mtu = clc->r0.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, |
|
u8 version) |
|
{ |
|
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, version); |
|
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); |
|
} |
|
|
|
static void smc_conn_abort(struct smc_sock *smc, int local_first) |
|
{ |
|
if (local_first) |
|
smc_lgr_cleanup_early(&smc->conn); |
|
else |
|
smc_conn_free(&smc->conn); |
|
} |
|
|
|
/* 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[0]) |
|
return SMC_CLC_DECL_NOSMCDDEV; |
|
else |
|
ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]); |
|
return 0; |
|
} |
|
|
|
/* is chid unique for the ism devices that are already determined? */ |
|
static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini, |
|
int cnt) |
|
{ |
|
int i = (!ini->ism_dev[0]) ? 1 : 0; |
|
|
|
for (; i < cnt; i++) |
|
if (ini->ism_chid[i] == chid) |
|
return false; |
|
return true; |
|
} |
|
|
|
/* determine possible V2 ISM devices (either without PNETID or with PNETID plus |
|
* PNETID matching net_device) |
|
*/ |
|
static int smc_find_ism_v2_device_clnt(struct smc_sock *smc, |
|
struct smc_init_info *ini) |
|
{ |
|
int rc = SMC_CLC_DECL_NOSMCDDEV; |
|
struct smcd_dev *smcd; |
|
int i = 1; |
|
u16 chid; |
|
|
|
if (smcd_indicated(ini->smc_type_v1)) |
|
rc = 0; /* already initialized for V1 */ |
|
mutex_lock(&smcd_dev_list.mutex); |
|
list_for_each_entry(smcd, &smcd_dev_list.list, list) { |
|
if (smcd->going_away || smcd == ini->ism_dev[0]) |
|
continue; |
|
chid = smc_ism_get_chid(smcd); |
|
if (!smc_find_ism_v2_is_unique_chid(chid, ini, i)) |
|
continue; |
|
if (!smc_pnet_is_pnetid_set(smcd->pnetid) || |
|
smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) { |
|
ini->ism_dev[i] = smcd; |
|
ini->ism_chid[i] = chid; |
|
ini->is_smcd = true; |
|
rc = 0; |
|
i++; |
|
if (i > SMC_MAX_ISM_DEVS) |
|
break; |
|
} |
|
} |
|
mutex_unlock(&smcd_dev_list.mutex); |
|
ini->ism_offered_cnt = i - 1; |
|
if (!ini->ism_dev[0] && !ini->ism_dev[1]) |
|
ini->smcd_version = 0; |
|
|
|
return rc; |
|
} |
|
|
|
/* Check for VLAN ID and register it on ISM device just for CLC handshake */ |
|
static int smc_connect_ism_vlan_setup(struct smc_sock *smc, |
|
struct smc_init_info *ini) |
|
{ |
|
if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id)) |
|
return SMC_CLC_DECL_ISMVLANERR; |
|
return 0; |
|
} |
|
|
|
static int smc_find_proposal_devices(struct smc_sock *smc, |
|
struct smc_init_info *ini) |
|
{ |
|
int rc = 0; |
|
|
|
/* check if there is an ism device available */ |
|
if (ini->smcd_version & SMC_V1) { |
|
if (smc_find_ism_device(smc, ini) || |
|
smc_connect_ism_vlan_setup(smc, ini)) { |
|
if (ini->smc_type_v1 == SMC_TYPE_B) |
|
ini->smc_type_v1 = SMC_TYPE_R; |
|
else |
|
ini->smc_type_v1 = SMC_TYPE_N; |
|
} /* else ISM V1 is supported for this connection */ |
|
if (smc_find_rdma_device(smc, ini)) { |
|
if (ini->smc_type_v1 == SMC_TYPE_B) |
|
ini->smc_type_v1 = SMC_TYPE_D; |
|
else |
|
ini->smc_type_v1 = SMC_TYPE_N; |
|
} /* else RDMA is supported for this connection */ |
|
} |
|
if (smc_ism_is_v2_capable() && smc_find_ism_v2_device_clnt(smc, ini)) |
|
ini->smc_type_v2 = SMC_TYPE_N; |
|
|
|
/* if neither ISM nor RDMA are supported, fallback */ |
|
if (!smcr_indicated(ini->smc_type_v1) && |
|
ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N) |
|
rc = SMC_CLC_DECL_NOSMCDEV; |
|
|
|
return rc; |
|
} |
|
|
|
/* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is |
|
* used, the VLAN ID will be registered again during the connection setup. |
|
*/ |
|
static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, |
|
struct smc_init_info *ini) |
|
{ |
|
if (!smcd_indicated(ini->smc_type_v1)) |
|
return 0; |
|
if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id)) |
|
return SMC_CLC_DECL_CNFERR; |
|
return 0; |
|
} |
|
|
|
#define SMC_CLC_MAX_ACCEPT_LEN \ |
|
(sizeof(struct smc_clc_msg_accept_confirm_v2) + \ |
|
sizeof(struct smc_clc_first_contact_ext) + \ |
|
sizeof(struct smc_clc_msg_trail)) |
|
|
|
/* CLC handshake during connect */ |
|
static int smc_connect_clc(struct smc_sock *smc, |
|
struct smc_clc_msg_accept_confirm_v2 *aclc2, |
|
struct smc_init_info *ini) |
|
{ |
|
int rc = 0; |
|
|
|
/* do inband token exchange */ |
|
rc = smc_clc_send_proposal(smc, ini); |
|
if (rc) |
|
return rc; |
|
/* receive SMC Accept CLC message */ |
|
return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN, |
|
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) |
|
{ |
|
int i, reason_code = 0; |
|
struct smc_link *link; |
|
|
|
ini->is_smcd = false; |
|
ini->ib_lcl = &aclc->r0.lcl; |
|
ini->ib_clcqpn = ntoh24(aclc->r0.qpn); |
|
ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; |
|
|
|
mutex_lock(&smc_client_lgr_pending); |
|
reason_code = smc_conn_create(smc, ini); |
|
if (reason_code) { |
|
mutex_unlock(&smc_client_lgr_pending); |
|
return reason_code; |
|
} |
|
|
|
smc_conn_save_peer_info(smc, aclc); |
|
|
|
if (ini->first_contact_local) { |
|
link = smc->conn.lnk; |
|
} else { |
|
/* set link that was assigned by server */ |
|
link = NULL; |
|
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { |
|
struct smc_link *l = &smc->conn.lgr->lnk[i]; |
|
|
|
if (l->peer_qpn == ntoh24(aclc->r0.qpn) && |
|
!memcmp(l->peer_gid, &aclc->r0.lcl.gid, |
|
SMC_GID_SIZE) && |
|
!memcmp(l->peer_mac, &aclc->r0.lcl.mac, |
|
sizeof(l->peer_mac))) { |
|
link = l; |
|
break; |
|
} |
|
} |
|
if (!link) { |
|
reason_code = SMC_CLC_DECL_NOSRVLINK; |
|
goto connect_abort; |
|
} |
|
smc->conn.lnk = link; |
|
} |
|
|
|
/* create send buffer and rmb */ |
|
if (smc_buf_create(smc, false)) { |
|
reason_code = SMC_CLC_DECL_MEM; |
|
goto connect_abort; |
|
} |
|
|
|
if (ini->first_contact_local) |
|
smc_link_save_peer_info(link, aclc); |
|
|
|
if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) { |
|
reason_code = SMC_CLC_DECL_ERR_RTOK; |
|
goto connect_abort; |
|
} |
|
|
|
smc_close_init(smc); |
|
smc_rx_init(smc); |
|
|
|
if (ini->first_contact_local) { |
|
if (smc_ib_ready_link(link)) { |
|
reason_code = SMC_CLC_DECL_ERR_RDYLNK; |
|
goto connect_abort; |
|
} |
|
} else { |
|
if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) { |
|
reason_code = SMC_CLC_DECL_ERR_REGRMB; |
|
goto connect_abort; |
|
} |
|
} |
|
smc_rmb_sync_sg_for_device(&smc->conn); |
|
|
|
reason_code = smc_clc_send_confirm(smc, ini->first_contact_local, |
|
SMC_V1); |
|
if (reason_code) |
|
goto connect_abort; |
|
|
|
smc_tx_init(smc); |
|
|
|
if (ini->first_contact_local) { |
|
/* QP confirmation over RoCE fabric */ |
|
smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); |
|
reason_code = smcr_clnt_conf_first_link(smc); |
|
smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); |
|
if (reason_code) |
|
goto connect_abort; |
|
} |
|
mutex_unlock(&smc_client_lgr_pending); |
|
|
|
smc_copy_sock_settings_to_clc(smc); |
|
smc->connect_nonblock = 0; |
|
if (smc->sk.sk_state == SMC_INIT) |
|
smc->sk.sk_state = SMC_ACTIVE; |
|
|
|
return 0; |
|
connect_abort: |
|
smc_conn_abort(smc, ini->first_contact_local); |
|
mutex_unlock(&smc_client_lgr_pending); |
|
smc->connect_nonblock = 0; |
|
|
|
return reason_code; |
|
} |
|
|
|
/* The server has chosen one of the proposed ISM devices for the communication. |
|
* Determine from the CHID of the received CLC ACCEPT the ISM device chosen. |
|
*/ |
|
static int |
|
smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc, |
|
struct smc_init_info *ini) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < ini->ism_offered_cnt + 1; i++) { |
|
if (ini->ism_chid[i] == ntohs(aclc->chid)) { |
|
ini->ism_selected = i; |
|
return 0; |
|
} |
|
} |
|
|
|
return -EPROTO; |
|
} |
|
|
|
/* setup for ISM connection of client */ |
|
static int smc_connect_ism(struct smc_sock *smc, |
|
struct smc_clc_msg_accept_confirm *aclc, |
|
struct smc_init_info *ini) |
|
{ |
|
int rc = 0; |
|
|
|
ini->is_smcd = true; |
|
ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; |
|
|
|
if (aclc->hdr.version == SMC_V2) { |
|
struct smc_clc_msg_accept_confirm_v2 *aclc_v2 = |
|
(struct smc_clc_msg_accept_confirm_v2 *)aclc; |
|
|
|
rc = smc_v2_determine_accepted_chid(aclc_v2, ini); |
|
if (rc) |
|
return rc; |
|
} |
|
ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid; |
|
|
|
/* there is only one lgr role for SMC-D; use server lock */ |
|
mutex_lock(&smc_server_lgr_pending); |
|
rc = smc_conn_create(smc, ini); |
|
if (rc) { |
|
mutex_unlock(&smc_server_lgr_pending); |
|
return rc; |
|
} |
|
|
|
/* Create send and receive buffers */ |
|
rc = smc_buf_create(smc, true); |
|
if (rc) { |
|
rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM; |
|
goto connect_abort; |
|
} |
|
|
|
smc_conn_save_peer_info(smc, aclc); |
|
smc_close_init(smc); |
|
smc_rx_init(smc); |
|
smc_tx_init(smc); |
|
|
|
rc = smc_clc_send_confirm(smc, ini->first_contact_local, |
|
aclc->hdr.version); |
|
if (rc) |
|
goto connect_abort; |
|
mutex_unlock(&smc_server_lgr_pending); |
|
|
|
smc_copy_sock_settings_to_clc(smc); |
|
smc->connect_nonblock = 0; |
|
if (smc->sk.sk_state == SMC_INIT) |
|
smc->sk.sk_state = SMC_ACTIVE; |
|
|
|
return 0; |
|
connect_abort: |
|
smc_conn_abort(smc, ini->first_contact_local); |
|
mutex_unlock(&smc_server_lgr_pending); |
|
smc->connect_nonblock = 0; |
|
|
|
return rc; |
|
} |
|
|
|
/* check if received accept type and version matches a proposed one */ |
|
static int smc_connect_check_aclc(struct smc_init_info *ini, |
|
struct smc_clc_msg_accept_confirm *aclc) |
|
{ |
|
if ((aclc->hdr.typev1 == SMC_TYPE_R && |
|
!smcr_indicated(ini->smc_type_v1)) || |
|
(aclc->hdr.typev1 == SMC_TYPE_D && |
|
((!smcd_indicated(ini->smc_type_v1) && |
|
!smcd_indicated(ini->smc_type_v2)) || |
|
(aclc->hdr.version == SMC_V1 && |
|
!smcd_indicated(ini->smc_type_v1)) || |
|
(aclc->hdr.version == SMC_V2 && |
|
!smcd_indicated(ini->smc_type_v2))))) |
|
return SMC_CLC_DECL_MODEUNSUPP; |
|
|
|
return 0; |
|
} |
|
|
|
/* perform steps before actually connecting */ |
|
static int __smc_connect(struct smc_sock *smc) |
|
{ |
|
u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1; |
|
struct smc_clc_msg_accept_confirm_v2 *aclc2; |
|
struct smc_clc_msg_accept_confirm *aclc; |
|
struct smc_init_info *ini = NULL; |
|
u8 *buf = NULL; |
|
int rc = 0; |
|
|
|
if (smc->use_fallback) |
|
return smc_connect_fallback(smc, smc->fallback_rsn); |
|
|
|
/* if peer has not signalled SMC-capability, fall back */ |
|
if (!tcp_sk(smc->clcsock->sk)->syn_smc) |
|
return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC); |
|
|
|
/* IPSec connections opt out of SMC optimizations */ |
|
if (using_ipsec(smc)) |
|
return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC, |
|
version); |
|
|
|
ini = kzalloc(sizeof(*ini), GFP_KERNEL); |
|
if (!ini) |
|
return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM, |
|
version); |
|
|
|
ini->smcd_version = SMC_V1; |
|
ini->smcd_version |= smc_ism_is_v2_capable() ? SMC_V2 : 0; |
|
ini->smc_type_v1 = SMC_TYPE_B; |
|
ini->smc_type_v2 = smc_ism_is_v2_capable() ? SMC_TYPE_D : SMC_TYPE_N; |
|
|
|
/* get vlan id from IP device */ |
|
if (smc_vlan_by_tcpsk(smc->clcsock, ini)) { |
|
ini->smcd_version &= ~SMC_V1; |
|
ini->smc_type_v1 = SMC_TYPE_N; |
|
if (!ini->smcd_version) { |
|
rc = SMC_CLC_DECL_GETVLANERR; |
|
goto fallback; |
|
} |
|
} |
|
|
|
rc = smc_find_proposal_devices(smc, ini); |
|
if (rc) |
|
goto fallback; |
|
|
|
buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL); |
|
if (!buf) { |
|
rc = SMC_CLC_DECL_MEM; |
|
goto fallback; |
|
} |
|
aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf; |
|
aclc = (struct smc_clc_msg_accept_confirm *)aclc2; |
|
|
|
/* perform CLC handshake */ |
|
rc = smc_connect_clc(smc, aclc2, ini); |
|
if (rc) |
|
goto vlan_cleanup; |
|
|
|
/* check if smc modes and versions of CLC proposal and accept match */ |
|
rc = smc_connect_check_aclc(ini, aclc); |
|
version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2; |
|
ini->smcd_version = version; |
|
if (rc) |
|
goto vlan_cleanup; |
|
|
|
/* depending on previous steps, connect using rdma or ism */ |
|
if (aclc->hdr.typev1 == SMC_TYPE_R) |
|
rc = smc_connect_rdma(smc, aclc, ini); |
|
else if (aclc->hdr.typev1 == SMC_TYPE_D) |
|
rc = smc_connect_ism(smc, aclc, ini); |
|
if (rc) |
|
goto vlan_cleanup; |
|
|
|
smc_connect_ism_vlan_cleanup(smc, ini); |
|
kfree(buf); |
|
kfree(ini); |
|
return 0; |
|
|
|
vlan_cleanup: |
|
smc_connect_ism_vlan_cleanup(smc, ini); |
|
kfree(buf); |
|
fallback: |
|
kfree(ini); |
|
return smc_connect_decline_fallback(smc, rc, version); |
|
} |
|
|
|
static void smc_connect_work(struct work_struct *work) |
|
{ |
|
struct smc_sock *smc = container_of(work, struct smc_sock, |
|
connect_work); |
|
long timeo = smc->sk.sk_sndtimeo; |
|
int rc = 0; |
|
|
|
if (!timeo) |
|
timeo = MAX_SCHEDULE_TIMEOUT; |
|
lock_sock(smc->clcsock->sk); |
|
if (smc->clcsock->sk->sk_err) { |
|
smc->sk.sk_err = smc->clcsock->sk->sk_err; |
|
} else if ((1 << smc->clcsock->sk->sk_state) & |
|
(TCPF_SYN_SENT | 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 (queue_work(smc_hs_wq, &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, SOCK_NONBLOCK); |
|
mutex_unlock(&lsmc->clcsock_release_lock); |
|
lock_sock(lsk); |
|
if (rc < 0 && rc != -EAGAIN) |
|
lsk->sk_err = -rc; |
|
if (rc < 0 || lsk->sk_state == SMC_CLOSED) { |
|
new_sk->sk_prot->unhash(new_sk); |
|
if (new_clcsock) |
|
sock_release(new_clcsock); |
|
new_sk->sk_state = SMC_CLOSED; |
|
sock_set_flag(new_sk, SOCK_DEAD); |
|
sock_put(new_sk); /* final */ |
|
*new_smc = NULL; |
|
goto out; |
|
} |
|
|
|
/* new clcsock has inherited the smc listen-specific sk_data_ready |
|
* function; switch it back to the original sk_data_ready function |
|
*/ |
|
new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready; |
|
(*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); |
|
|
|
sock_hold(sk); /* sock_put below */ |
|
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); /* sock_hold above */ |
|
sock_put(sk); /* final sock_put */ |
|
} |
|
|
|
static int smcr_serv_conf_first_link(struct smc_sock *smc) |
|
{ |
|
struct smc_link *link = smc->conn.lnk; |
|
struct smc_llc_qentry *qentry; |
|
int rc; |
|
|
|
if (smcr_link_reg_rmb(link, smc->conn.rmb_desc)) |
|
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 */ |
|
qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME, |
|
SMC_LLC_CONFIRM_LINK); |
|
if (!qentry) { |
|
struct smc_clc_msg_decline dclc; |
|
|
|
rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), |
|
SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); |
|
return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; |
|
} |
|
smc_llc_save_peer_uid(qentry); |
|
rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP); |
|
smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); |
|
if (rc) |
|
return SMC_CLC_DECL_RMBE_EC; |
|
|
|
/* confirm_rkey is implicit on 1st contact */ |
|
smc->conn.rmb_desc->is_conf_rkey = true; |
|
|
|
smc_llc_link_active(link); |
|
smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); |
|
|
|
/* initial contact - try to establish second link */ |
|
smc_llc_srv_add_link(link); |
|
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_listen_out(new_smc); |
|
} |
|
|
|
/* listen worker: decline and fall back if possible */ |
|
static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, |
|
int local_first, u8 version) |
|
{ |
|
/* RDMA setup failed, switch back to TCP */ |
|
smc_conn_abort(new_smc, local_first); |
|
if (reason_code < 0) { /* error, no fallback possible */ |
|
smc_listen_out_err(new_smc); |
|
return; |
|
} |
|
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, version) < 0) { |
|
smc_listen_out_err(new_smc); |
|
return; |
|
} |
|
} |
|
smc_listen_out_connected(new_smc); |
|
} |
|
|
|
/* listen worker: version checking */ |
|
static int smc_listen_v2_check(struct smc_sock *new_smc, |
|
struct smc_clc_msg_proposal *pclc, |
|
struct smc_init_info *ini) |
|
{ |
|
struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext; |
|
struct smc_clc_v2_extension *pclc_v2_ext; |
|
int rc = SMC_CLC_DECL_PEERNOSMC; |
|
|
|
ini->smc_type_v1 = pclc->hdr.typev1; |
|
ini->smc_type_v2 = pclc->hdr.typev2; |
|
ini->smcd_version = ini->smc_type_v1 != SMC_TYPE_N ? SMC_V1 : 0; |
|
if (pclc->hdr.version > SMC_V1) |
|
ini->smcd_version |= |
|
ini->smc_type_v2 != SMC_TYPE_N ? SMC_V2 : 0; |
|
if (!(ini->smcd_version & SMC_V2)) { |
|
rc = SMC_CLC_DECL_PEERNOSMC; |
|
goto out; |
|
} |
|
if (!smc_ism_is_v2_capable()) { |
|
ini->smcd_version &= ~SMC_V2; |
|
rc = SMC_CLC_DECL_NOISM2SUPP; |
|
goto out; |
|
} |
|
pclc_v2_ext = smc_get_clc_v2_ext(pclc); |
|
if (!pclc_v2_ext) { |
|
ini->smcd_version &= ~SMC_V2; |
|
rc = SMC_CLC_DECL_NOV2EXT; |
|
goto out; |
|
} |
|
pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext); |
|
if (!pclc_smcd_v2_ext) { |
|
ini->smcd_version &= ~SMC_V2; |
|
rc = SMC_CLC_DECL_NOV2DEXT; |
|
} |
|
|
|
out: |
|
if (!ini->smcd_version) |
|
return rc; |
|
|
|
return 0; |
|
} |
|
|
|
/* listen worker: check prefixes */ |
|
static int smc_listen_prfx_check(struct smc_sock *new_smc, |
|
struct smc_clc_msg_proposal *pclc) |
|
{ |
|
struct smc_clc_msg_proposal_prefix *pclc_prfx; |
|
struct socket *newclcsock = new_smc->clcsock; |
|
|
|
if (pclc->hdr.typev1 == SMC_TYPE_N) |
|
return 0; |
|
pclc_prfx = smc_clc_proposal_get_prefix(pclc); |
|
if (smc_clc_prfx_match(newclcsock, pclc_prfx)) |
|
return SMC_CLC_DECL_DIFFPREFIX; |
|
|
|
return 0; |
|
} |
|
|
|
/* listen worker: initialize connection and buffers */ |
|
static int smc_listen_rdma_init(struct smc_sock *new_smc, |
|
struct smc_init_info *ini) |
|
{ |
|
int rc; |
|
|
|
/* allocate connection / link group */ |
|
rc = smc_conn_create(new_smc, ini); |
|
if (rc) |
|
return rc; |
|
|
|
/* create send buffer and rmb */ |
|
if (smc_buf_create(new_smc, false)) |
|
return SMC_CLC_DECL_MEM; |
|
|
|
return 0; |
|
} |
|
|
|
/* listen worker: initialize connection and buffers for SMC-D */ |
|
static int smc_listen_ism_init(struct smc_sock *new_smc, |
|
struct smc_init_info *ini) |
|
{ |
|
int rc; |
|
|
|
rc = smc_conn_create(new_smc, ini); |
|
if (rc) |
|
return rc; |
|
|
|
/* Create send and receive buffers */ |
|
rc = smc_buf_create(new_smc, true); |
|
if (rc) { |
|
smc_conn_abort(new_smc, ini->first_contact_local); |
|
return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : |
|
SMC_CLC_DECL_MEM; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static bool smc_is_already_selected(struct smcd_dev *smcd, |
|
struct smc_init_info *ini, |
|
int matches) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < matches; i++) |
|
if (smcd == ini->ism_dev[i]) |
|
return true; |
|
|
|
return false; |
|
} |
|
|
|
/* check for ISM devices matching proposed ISM devices */ |
|
static void smc_check_ism_v2_match(struct smc_init_info *ini, |
|
u16 proposed_chid, u64 proposed_gid, |
|
unsigned int *matches) |
|
{ |
|
struct smcd_dev *smcd; |
|
|
|
list_for_each_entry(smcd, &smcd_dev_list.list, list) { |
|
if (smcd->going_away) |
|
continue; |
|
if (smc_is_already_selected(smcd, ini, *matches)) |
|
continue; |
|
if (smc_ism_get_chid(smcd) == proposed_chid && |
|
!smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) { |
|
ini->ism_peer_gid[*matches] = proposed_gid; |
|
ini->ism_dev[*matches] = smcd; |
|
(*matches)++; |
|
break; |
|
} |
|
} |
|
} |
|
|
|
static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini) |
|
{ |
|
if (!ini->rc) |
|
ini->rc = rc; |
|
} |
|
|
|
static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc, |
|
struct smc_clc_msg_proposal *pclc, |
|
struct smc_init_info *ini) |
|
{ |
|
struct smc_clc_smcd_v2_extension *smcd_v2_ext; |
|
struct smc_clc_v2_extension *smc_v2_ext; |
|
struct smc_clc_msg_smcd *pclc_smcd; |
|
unsigned int matches = 0; |
|
u8 smcd_version; |
|
u8 *eid = NULL; |
|
int i, rc; |
|
|
|
if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2)) |
|
goto not_found; |
|
|
|
pclc_smcd = smc_get_clc_msg_smcd(pclc); |
|
smc_v2_ext = smc_get_clc_v2_ext(pclc); |
|
smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext); |
|
if (!smcd_v2_ext || |
|
!smc_v2_ext->hdr.flag.seid) { /* no system EID support for SMCD */ |
|
smc_find_ism_store_rc(SMC_CLC_DECL_NOSEID, ini); |
|
goto not_found; |
|
} |
|
|
|
mutex_lock(&smcd_dev_list.mutex); |
|
if (pclc_smcd->ism.chid) |
|
/* check for ISM device matching proposed native ISM device */ |
|
smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid), |
|
ntohll(pclc_smcd->ism.gid), &matches); |
|
for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) { |
|
/* check for ISM devices matching proposed non-native ISM |
|
* devices |
|
*/ |
|
smc_check_ism_v2_match(ini, |
|
ntohs(smcd_v2_ext->gidchid[i - 1].chid), |
|
ntohll(smcd_v2_ext->gidchid[i - 1].gid), |
|
&matches); |
|
} |
|
mutex_unlock(&smcd_dev_list.mutex); |
|
|
|
if (ini->ism_dev[0]) { |
|
smc_ism_get_system_eid(ini->ism_dev[0], &eid); |
|
if (memcmp(eid, smcd_v2_ext->system_eid, SMC_MAX_EID_LEN)) |
|
goto not_found; |
|
} else { |
|
goto not_found; |
|
} |
|
|
|
/* separate - outside the smcd_dev_list.lock */ |
|
smcd_version = ini->smcd_version; |
|
for (i = 0; i < matches; i++) { |
|
ini->smcd_version = SMC_V2; |
|
ini->is_smcd = true; |
|
ini->ism_selected = i; |
|
rc = smc_listen_ism_init(new_smc, ini); |
|
if (rc) { |
|
smc_find_ism_store_rc(rc, ini); |
|
/* try next active ISM device */ |
|
continue; |
|
} |
|
return; /* matching and usable V2 ISM device found */ |
|
} |
|
/* no V2 ISM device could be initialized */ |
|
ini->smcd_version = smcd_version; /* restore original value */ |
|
|
|
not_found: |
|
ini->smcd_version &= ~SMC_V2; |
|
ini->ism_dev[0] = NULL; |
|
ini->is_smcd = false; |
|
} |
|
|
|
static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc, |
|
struct smc_clc_msg_proposal *pclc, |
|
struct smc_init_info *ini) |
|
{ |
|
struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc); |
|
int rc = 0; |
|
|
|
/* check if ISM V1 is available */ |
|
if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1)) |
|
goto not_found; |
|
ini->is_smcd = true; /* prepare ISM check */ |
|
ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid); |
|
rc = smc_find_ism_device(new_smc, ini); |
|
if (rc) |
|
goto not_found; |
|
ini->ism_selected = 0; |
|
rc = smc_listen_ism_init(new_smc, ini); |
|
if (!rc) |
|
return; /* V1 ISM device found */ |
|
|
|
not_found: |
|
smc_find_ism_store_rc(rc, ini); |
|
ini->ism_dev[0] = NULL; |
|
ini->is_smcd = false; |
|
} |
|
|
|
/* listen worker: register buffers */ |
|
static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first) |
|
{ |
|
struct smc_connection *conn = &new_smc->conn; |
|
|
|
if (!local_first) { |
|
if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc)) |
|
return SMC_CLC_DECL_ERR_REGRMB; |
|
} |
|
smc_rmb_sync_sg_for_device(&new_smc->conn); |
|
|
|
return 0; |
|
} |
|
|
|
static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc, |
|
struct smc_clc_msg_proposal *pclc, |
|
struct smc_init_info *ini) |
|
{ |
|
int rc; |
|
|
|
if (!smcr_indicated(ini->smc_type_v1)) |
|
return SMC_CLC_DECL_NOSMCDEV; |
|
|
|
/* prepare RDMA check */ |
|
ini->ib_lcl = &pclc->lcl; |
|
rc = smc_find_rdma_device(new_smc, ini); |
|
if (rc) { |
|
/* no RDMA device found */ |
|
if (ini->smc_type_v1 == SMC_TYPE_B) |
|
/* neither ISM nor RDMA device found */ |
|
rc = SMC_CLC_DECL_NOSMCDEV; |
|
return rc; |
|
} |
|
rc = smc_listen_rdma_init(new_smc, ini); |
|
if (rc) |
|
return rc; |
|
return smc_listen_rdma_reg(new_smc, ini->first_contact_local); |
|
} |
|
|
|
/* determine the local device matching to proposal */ |
|
static int smc_listen_find_device(struct smc_sock *new_smc, |
|
struct smc_clc_msg_proposal *pclc, |
|
struct smc_init_info *ini) |
|
{ |
|
int rc; |
|
|
|
/* check for ISM device matching V2 proposed device */ |
|
smc_find_ism_v2_device_serv(new_smc, pclc, ini); |
|
if (ini->ism_dev[0]) |
|
return 0; |
|
|
|
if (!(ini->smcd_version & SMC_V1)) |
|
return ini->rc ?: SMC_CLC_DECL_NOSMCD2DEV; |
|
|
|
/* check for matching IP prefix and subnet length */ |
|
rc = smc_listen_prfx_check(new_smc, pclc); |
|
if (rc) |
|
return ini->rc ?: rc; |
|
|
|
/* get vlan id from IP device */ |
|
if (smc_vlan_by_tcpsk(new_smc->clcsock, ini)) |
|
return ini->rc ?: SMC_CLC_DECL_GETVLANERR; |
|
|
|
/* check for ISM device matching V1 proposed device */ |
|
smc_find_ism_v1_device_serv(new_smc, pclc, ini); |
|
if (ini->ism_dev[0]) |
|
return 0; |
|
|
|
if (pclc->hdr.typev1 == SMC_TYPE_D) |
|
/* skip RDMA and decline */ |
|
return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV; |
|
|
|
/* check if RDMA is available */ |
|
rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini); |
|
smc_find_ism_store_rc(rc, ini); |
|
|
|
return (!rc) ? 0 : ini->rc; |
|
} |
|
|
|
/* listen worker: finish RDMA setup */ |
|
static int smc_listen_rdma_finish(struct smc_sock *new_smc, |
|
struct smc_clc_msg_accept_confirm *cclc, |
|
bool local_first) |
|
{ |
|
struct smc_link *link = new_smc->conn.lnk; |
|
int reason_code = 0; |
|
|
|
if (local_first) |
|
smc_link_save_peer_info(link, cclc); |
|
|
|
if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc)) |
|
return SMC_CLC_DECL_ERR_RTOK; |
|
|
|
if (local_first) { |
|
if (smc_ib_ready_link(link)) |
|
return SMC_CLC_DECL_ERR_RDYLNK; |
|
/* QP confirmation over RoCE fabric */ |
|
smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); |
|
reason_code = smcr_serv_conf_first_link(new_smc); |
|
smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); |
|
} |
|
return reason_code; |
|
} |
|
|
|
/* setup for connection of server */ |
|
static void smc_listen_work(struct work_struct *work) |
|
{ |
|
struct smc_sock *new_smc = container_of(work, struct smc_sock, |
|
smc_listen_work); |
|
u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1; |
|
struct socket *newclcsock = new_smc->clcsock; |
|
struct smc_clc_msg_accept_confirm *cclc; |
|
struct smc_clc_msg_proposal_area *buf; |
|
struct smc_clc_msg_proposal *pclc; |
|
struct smc_init_info *ini = NULL; |
|
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 |
|
*/ |
|
buf = kzalloc(sizeof(*buf), GFP_KERNEL); |
|
if (!buf) { |
|
rc = SMC_CLC_DECL_MEM; |
|
goto out_decl; |
|
} |
|
pclc = (struct smc_clc_msg_proposal *)buf; |
|
rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf), |
|
SMC_CLC_PROPOSAL, CLC_WAIT_TIME); |
|
if (rc) |
|
goto out_decl; |
|
version = pclc->hdr.version == SMC_V1 ? SMC_V1 : version; |
|
|
|
/* IPSec connections opt out of SMC optimizations */ |
|
if (using_ipsec(new_smc)) { |
|
rc = SMC_CLC_DECL_IPSEC; |
|
goto out_decl; |
|
} |
|
|
|
ini = kzalloc(sizeof(*ini), GFP_KERNEL); |
|
if (!ini) { |
|
rc = SMC_CLC_DECL_MEM; |
|
goto out_decl; |
|
} |
|
|
|
/* initial version checking */ |
|
rc = smc_listen_v2_check(new_smc, pclc, ini); |
|
if (rc) |
|
goto out_decl; |
|
|
|
mutex_lock(&smc_server_lgr_pending); |
|
smc_close_init(new_smc); |
|
smc_rx_init(new_smc); |
|
smc_tx_init(new_smc); |
|
|
|
/* determine ISM or RoCE device used for connection */ |
|
rc = smc_listen_find_device(new_smc, pclc, ini); |
|
if (rc) |
|
goto out_unlock; |
|
|
|
/* send SMC Accept CLC message */ |
|
rc = smc_clc_send_accept(new_smc, ini->first_contact_local, |
|
ini->smcd_version == SMC_V2 ? SMC_V2 : SMC_V1); |
|
if (rc) |
|
goto out_unlock; |
|
|
|
/* SMC-D does not need this lock any more */ |
|
if (ini->is_smcd) |
|
mutex_unlock(&smc_server_lgr_pending); |
|
|
|
/* receive SMC Confirm CLC message */ |
|
memset(buf, 0, sizeof(*buf)); |
|
cclc = (struct smc_clc_msg_accept_confirm *)buf; |
|
rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf), |
|
SMC_CLC_CONFIRM, CLC_WAIT_TIME); |
|
if (rc) { |
|
if (!ini->is_smcd) |
|
goto out_unlock; |
|
goto out_decl; |
|
} |
|
|
|
/* finish worker */ |
|
if (!ini->is_smcd) { |
|
rc = smc_listen_rdma_finish(new_smc, cclc, |
|
ini->first_contact_local); |
|
if (rc) |
|
goto out_unlock; |
|
mutex_unlock(&smc_server_lgr_pending); |
|
} |
|
smc_conn_save_peer_info(new_smc, cclc); |
|
smc_listen_out_connected(new_smc); |
|
goto out_free; |
|
|
|
out_unlock: |
|
mutex_unlock(&smc_server_lgr_pending); |
|
out_decl: |
|
smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0, |
|
version); |
|
out_free: |
|
kfree(ini); |
|
kfree(buf); |
|
} |
|
|
|
static void smc_tcp_listen_work(struct work_struct *work) |
|
{ |
|
struct smc_sock *lsmc = container_of(work, struct smc_sock, |
|
tcp_listen_work); |
|
struct sock *lsk = &lsmc->sk; |
|
struct smc_sock *new_smc; |
|
int rc = 0; |
|
|
|
lock_sock(lsk); |
|
while (lsk->sk_state == SMC_LISTEN) { |
|
rc = smc_clcsock_accept(lsmc, &new_smc); |
|
if (rc) /* clcsock accept queue empty or error */ |
|
goto out; |
|
if (!new_smc) |
|
continue; |
|
|
|
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 (!queue_work(smc_hs_wq, &new_smc->smc_listen_work)) |
|
sock_put(&new_smc->sk); |
|
} |
|
|
|
out: |
|
release_sock(lsk); |
|
sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */ |
|
} |
|
|
|
static void smc_clcsock_data_ready(struct sock *listen_clcsock) |
|
{ |
|
struct smc_sock *lsmc; |
|
|
|
lsmc = (struct smc_sock *) |
|
((uintptr_t)listen_clcsock->sk_user_data & ~SK_USER_DATA_NOCOPY); |
|
if (!lsmc) |
|
return; |
|
lsmc->clcsk_data_ready(listen_clcsock); |
|
if (lsmc->sk.sk_state == SMC_LISTEN) { |
|
sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */ |
|
if (!queue_work(smc_hs_wq, &lsmc->tcp_listen_work)) |
|
sock_put(&lsmc->sk); |
|
} |
|
} |
|
|
|
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; |
|
|
|
/* save original sk_data_ready function and establish |
|
* smc-specific sk_data_ready function |
|
*/ |
|
smc->clcsk_data_ready = smc->clcsock->sk->sk_data_ready; |
|
smc->clcsock->sk->sk_data_ready = smc_clcsock_data_ready; |
|
smc->clcsock->sk->sk_user_data = |
|
(void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); |
|
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; |
|
|
|
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, |
|
sockptr_t optval, unsigned int optlen) |
|
{ |
|
struct sock *sk = sock->sk; |
|
struct smc_sock *smc; |
|
int val, rc; |
|
|
|
if (level == SOL_TCP && optname == TCP_ULP) |
|
return -EOPNOTSUPP; |
|
|
|
smc = smc_sk(sk); |
|
|
|
/* generic setsockopts reaching us here always apply to the |
|
* CLC socket |
|
*/ |
|
if (unlikely(!smc->clcsock->ops->setsockopt)) |
|
rc = -EOPNOTSUPP; |
|
else |
|
rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, |
|
optval, optlen); |
|
if (smc->clcsock->sk->sk_err) { |
|
sk->sk_err = smc->clcsock->sk->sk_err; |
|
sk->sk_error_report(sk); |
|
} |
|
|
|
if (optlen < sizeof(int)) |
|
return -EINVAL; |
|
if (copy_from_sockptr(&val, optval, sizeof(int))) |
|
return -EFAULT; |
|
|
|
lock_sock(sk); |
|
if (rc || smc->use_fallback) |
|
goto out; |
|
switch (optname) { |
|
case TCP_FASTOPEN: |
|
case TCP_FASTOPEN_CONNECT: |
|
case TCP_FASTOPEN_KEY: |
|
case TCP_FASTOPEN_NO_COOKIE: |
|
/* option not supported by SMC */ |
|
if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { |
|
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(smc->conn.lgr->tx_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(smc->conn.lgr->tx_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 */ |
|
if (unlikely(!smc->clcsock->ops->getsockopt)) |
|
return -EOPNOTSUPP; |
|
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; |
|
|
|
smc_ism_init(); |
|
smc_clc_init(); |
|
|
|
rc = smc_nl_init(); |
|
if (rc) |
|
goto out_pernet_subsys; |
|
|
|
rc = smc_pnet_init(); |
|
if (rc) |
|
goto out_nl; |
|
|
|
rc = -ENOMEM; |
|
smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0); |
|
if (!smc_hs_wq) |
|
goto out_pnet; |
|
|
|
smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0); |
|
if (!smc_close_wq) |
|
goto out_alloc_hs_wq; |
|
|
|
rc = smc_core_init(); |
|
if (rc) { |
|
pr_err("%s: smc_core_init fails with %d\n", __func__, rc); |
|
goto out_alloc_wqs; |
|
} |
|
|
|
rc = smc_llc_init(); |
|
if (rc) { |
|
pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); |
|
goto out_core; |
|
} |
|
|
|
rc = smc_cdc_init(); |
|
if (rc) { |
|
pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); |
|
goto out_core; |
|
} |
|
|
|
rc = proto_register(&smc_proto, 1); |
|
if (rc) { |
|
pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); |
|
goto out_core; |
|
} |
|
|
|
rc = proto_register(&smc_proto6, 1); |
|
if (rc) { |
|
pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); |
|
goto out_proto; |
|
} |
|
|
|
rc = sock_register(&smc_sock_family_ops); |
|
if (rc) { |
|
pr_err("%s: sock_register fails with %d\n", __func__, rc); |
|
goto out_proto6; |
|
} |
|
INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); |
|
INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); |
|
|
|
rc = smc_ib_register_client(); |
|
if (rc) { |
|
pr_err("%s: ib_register fails with %d\n", __func__, rc); |
|
goto out_sock; |
|
} |
|
|
|
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_core: |
|
smc_core_exit(); |
|
out_alloc_wqs: |
|
destroy_workqueue(smc_close_wq); |
|
out_alloc_hs_wq: |
|
destroy_workqueue(smc_hs_wq); |
|
out_pnet: |
|
smc_pnet_exit(); |
|
out_nl: |
|
smc_nl_exit(); |
|
out_pernet_subsys: |
|
unregister_pernet_subsys(&smc_net_ops); |
|
|
|
return rc; |
|
} |
|
|
|
static void __exit smc_exit(void) |
|
{ |
|
static_branch_disable(&tcp_have_smc); |
|
sock_unregister(PF_SMC); |
|
smc_core_exit(); |
|
smc_ib_unregister_client(); |
|
destroy_workqueue(smc_close_wq); |
|
destroy_workqueue(smc_hs_wq); |
|
proto_unregister(&smc_proto6); |
|
proto_unregister(&smc_proto); |
|
smc_pnet_exit(); |
|
smc_nl_exit(); |
|
unregister_pernet_subsys(&smc_net_ops); |
|
rcu_barrier(); |
|
} |
|
|
|
module_init(smc_init); |
|
module_exit(smc_exit); |
|
|
|
MODULE_AUTHOR("Ursula Braun <[email protected]>"); |
|
MODULE_DESCRIPTION("smc socket address family"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS_NETPROTO(PF_SMC);
|
|
|