500 строки
12 KiB
C
500 строки
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* Socket Closing - normal and abnormal
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
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*/
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#include <linux/workqueue.h>
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#include <linux/sched/signal.h>
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#include <net/sock.h>
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#include <net/tcp.h>
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#include "smc.h"
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#include "smc_tx.h"
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#include "smc_cdc.h"
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#include "smc_close.h"
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/* release the clcsock that is assigned to the smc_sock */
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void smc_clcsock_release(struct smc_sock *smc)
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{
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struct socket *tcp;
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if (smc->listen_smc && current_work() != &smc->smc_listen_work)
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cancel_work_sync(&smc->smc_listen_work);
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mutex_lock(&smc->clcsock_release_lock);
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if (smc->clcsock) {
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tcp = smc->clcsock;
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smc->clcsock = NULL;
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sock_release(tcp);
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}
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mutex_unlock(&smc->clcsock_release_lock);
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}
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static void smc_close_cleanup_listen(struct sock *parent)
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{
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struct sock *sk;
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/* Close non-accepted connections */
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while ((sk = smc_accept_dequeue(parent, NULL)))
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smc_close_non_accepted(sk);
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}
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/* wait for sndbuf data being transmitted */
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static void smc_close_stream_wait(struct smc_sock *smc, long timeout)
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{
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DEFINE_WAIT_FUNC(wait, woken_wake_function);
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struct sock *sk = &smc->sk;
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if (!timeout)
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return;
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if (!smc_tx_prepared_sends(&smc->conn))
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return;
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smc->wait_close_tx_prepared = 1;
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add_wait_queue(sk_sleep(sk), &wait);
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while (!signal_pending(current) && timeout) {
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int rc;
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rc = sk_wait_event(sk, &timeout,
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!smc_tx_prepared_sends(&smc->conn) ||
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sk->sk_err == ECONNABORTED ||
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sk->sk_err == ECONNRESET ||
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smc->conn.killed,
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&wait);
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if (rc)
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break;
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}
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remove_wait_queue(sk_sleep(sk), &wait);
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smc->wait_close_tx_prepared = 0;
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}
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void smc_close_wake_tx_prepared(struct smc_sock *smc)
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{
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if (smc->wait_close_tx_prepared)
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/* wake up socket closing */
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smc->sk.sk_state_change(&smc->sk);
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}
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static int smc_close_wr(struct smc_connection *conn)
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{
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conn->local_tx_ctrl.conn_state_flags.peer_done_writing = 1;
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return smc_cdc_get_slot_and_msg_send(conn);
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}
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static int smc_close_final(struct smc_connection *conn)
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{
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if (atomic_read(&conn->bytes_to_rcv))
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conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
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else
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conn->local_tx_ctrl.conn_state_flags.peer_conn_closed = 1;
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if (conn->killed)
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return -EPIPE;
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return smc_cdc_get_slot_and_msg_send(conn);
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}
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int smc_close_abort(struct smc_connection *conn)
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{
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conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
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return smc_cdc_get_slot_and_msg_send(conn);
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}
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static void smc_close_cancel_work(struct smc_sock *smc)
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{
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struct sock *sk = &smc->sk;
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release_sock(sk);
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cancel_work_sync(&smc->conn.close_work);
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cancel_delayed_work_sync(&smc->conn.tx_work);
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lock_sock(sk);
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}
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/* terminate smc socket abnormally - active abort
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* link group is terminated, i.e. RDMA communication no longer possible
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*/
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void smc_close_active_abort(struct smc_sock *smc)
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{
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struct sock *sk = &smc->sk;
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bool release_clcsock = false;
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if (sk->sk_state != SMC_INIT && smc->clcsock && smc->clcsock->sk) {
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sk->sk_err = ECONNABORTED;
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if (smc->clcsock && smc->clcsock->sk)
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tcp_abort(smc->clcsock->sk, ECONNABORTED);
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}
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switch (sk->sk_state) {
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case SMC_ACTIVE:
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case SMC_APPCLOSEWAIT1:
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case SMC_APPCLOSEWAIT2:
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sk->sk_state = SMC_PEERABORTWAIT;
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smc_close_cancel_work(smc);
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if (sk->sk_state != SMC_PEERABORTWAIT)
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break;
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sk->sk_state = SMC_CLOSED;
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sock_put(sk); /* (postponed) passive closing */
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break;
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case SMC_PEERCLOSEWAIT1:
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case SMC_PEERCLOSEWAIT2:
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case SMC_PEERFINCLOSEWAIT:
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sk->sk_state = SMC_PEERABORTWAIT;
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smc_close_cancel_work(smc);
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if (sk->sk_state != SMC_PEERABORTWAIT)
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break;
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sk->sk_state = SMC_CLOSED;
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smc_conn_free(&smc->conn);
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release_clcsock = true;
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sock_put(sk); /* passive closing */
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break;
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case SMC_PROCESSABORT:
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case SMC_APPFINCLOSEWAIT:
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sk->sk_state = SMC_PEERABORTWAIT;
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smc_close_cancel_work(smc);
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if (sk->sk_state != SMC_PEERABORTWAIT)
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break;
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sk->sk_state = SMC_CLOSED;
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smc_conn_free(&smc->conn);
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release_clcsock = true;
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break;
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case SMC_INIT:
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case SMC_PEERABORTWAIT:
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case SMC_CLOSED:
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break;
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}
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sock_set_flag(sk, SOCK_DEAD);
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sk->sk_state_change(sk);
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if (release_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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}
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static inline bool smc_close_sent_any_close(struct smc_connection *conn)
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{
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return conn->local_tx_ctrl.conn_state_flags.peer_conn_abort ||
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conn->local_tx_ctrl.conn_state_flags.peer_conn_closed;
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}
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int smc_close_active(struct smc_sock *smc)
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{
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struct smc_cdc_conn_state_flags *txflags =
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&smc->conn.local_tx_ctrl.conn_state_flags;
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struct smc_connection *conn = &smc->conn;
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struct sock *sk = &smc->sk;
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int old_state;
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long timeout;
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int rc = 0;
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int rc1 = 0;
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timeout = current->flags & PF_EXITING ?
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0 : sock_flag(sk, SOCK_LINGER) ?
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sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;
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old_state = sk->sk_state;
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again:
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switch (sk->sk_state) {
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case SMC_INIT:
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sk->sk_state = SMC_CLOSED;
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break;
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case SMC_LISTEN:
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sk->sk_state = SMC_CLOSED;
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sk->sk_state_change(sk); /* wake up accept */
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if (smc->clcsock && smc->clcsock->sk) {
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smc->clcsock->sk->sk_data_ready = smc->clcsk_data_ready;
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smc->clcsock->sk->sk_user_data = NULL;
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rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
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}
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smc_close_cleanup_listen(sk);
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release_sock(sk);
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flush_work(&smc->tcp_listen_work);
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lock_sock(sk);
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break;
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case SMC_ACTIVE:
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smc_close_stream_wait(smc, timeout);
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release_sock(sk);
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cancel_delayed_work_sync(&conn->tx_work);
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lock_sock(sk);
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if (sk->sk_state == SMC_ACTIVE) {
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/* send close request */
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rc = smc_close_final(conn);
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sk->sk_state = SMC_PEERCLOSEWAIT1;
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/* actively shutdown clcsock before peer close it,
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* prevent peer from entering TIME_WAIT state.
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*/
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if (smc->clcsock && smc->clcsock->sk) {
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rc1 = kernel_sock_shutdown(smc->clcsock,
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SHUT_RDWR);
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rc = rc ? rc : rc1;
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}
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} else {
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/* peer event has changed the state */
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goto again;
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}
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break;
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case SMC_APPFINCLOSEWAIT:
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/* socket already shutdown wr or both (active close) */
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if (txflags->peer_done_writing &&
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!smc_close_sent_any_close(conn)) {
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/* just shutdown wr done, send close request */
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rc = smc_close_final(conn);
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}
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sk->sk_state = SMC_CLOSED;
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break;
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case SMC_APPCLOSEWAIT1:
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case SMC_APPCLOSEWAIT2:
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if (!smc_cdc_rxed_any_close(conn))
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smc_close_stream_wait(smc, timeout);
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release_sock(sk);
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cancel_delayed_work_sync(&conn->tx_work);
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lock_sock(sk);
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if (sk->sk_state != SMC_APPCLOSEWAIT1 &&
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sk->sk_state != SMC_APPCLOSEWAIT2)
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goto again;
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/* confirm close from peer */
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rc = smc_close_final(conn);
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if (smc_cdc_rxed_any_close(conn)) {
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/* peer has closed the socket already */
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sk->sk_state = SMC_CLOSED;
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sock_put(sk); /* postponed passive closing */
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} else {
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/* peer has just issued a shutdown write */
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sk->sk_state = SMC_PEERFINCLOSEWAIT;
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}
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break;
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case SMC_PEERCLOSEWAIT1:
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case SMC_PEERCLOSEWAIT2:
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if (txflags->peer_done_writing &&
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!smc_close_sent_any_close(conn)) {
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/* just shutdown wr done, send close request */
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rc = smc_close_final(conn);
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}
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/* peer sending PeerConnectionClosed will cause transition */
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break;
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case SMC_PEERFINCLOSEWAIT:
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/* peer sending PeerConnectionClosed will cause transition */
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break;
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case SMC_PROCESSABORT:
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rc = smc_close_abort(conn);
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sk->sk_state = SMC_CLOSED;
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break;
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case SMC_PEERABORTWAIT:
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sk->sk_state = SMC_CLOSED;
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break;
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case SMC_CLOSED:
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/* nothing to do, add tracing in future patch */
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break;
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}
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if (old_state != sk->sk_state)
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sk->sk_state_change(sk);
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return rc;
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}
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static void smc_close_passive_abort_received(struct smc_sock *smc)
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{
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struct smc_cdc_conn_state_flags *txflags =
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&smc->conn.local_tx_ctrl.conn_state_flags;
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struct sock *sk = &smc->sk;
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switch (sk->sk_state) {
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case SMC_INIT:
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case SMC_ACTIVE:
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case SMC_APPCLOSEWAIT1:
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sk->sk_state = SMC_PROCESSABORT;
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sock_put(sk); /* passive closing */
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break;
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case SMC_APPFINCLOSEWAIT:
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sk->sk_state = SMC_PROCESSABORT;
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break;
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case SMC_PEERCLOSEWAIT1:
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case SMC_PEERCLOSEWAIT2:
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if (txflags->peer_done_writing &&
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!smc_close_sent_any_close(&smc->conn))
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/* just shutdown, but not yet closed locally */
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sk->sk_state = SMC_PROCESSABORT;
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else
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sk->sk_state = SMC_CLOSED;
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sock_put(sk); /* passive closing */
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break;
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case SMC_APPCLOSEWAIT2:
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case SMC_PEERFINCLOSEWAIT:
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sk->sk_state = SMC_CLOSED;
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sock_put(sk); /* passive closing */
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break;
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case SMC_PEERABORTWAIT:
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sk->sk_state = SMC_CLOSED;
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break;
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case SMC_PROCESSABORT:
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/* nothing to do, add tracing in future patch */
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break;
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}
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}
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/* Either some kind of closing has been received: peer_conn_closed,
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* peer_conn_abort, or peer_done_writing
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* or the link group of the connection terminates abnormally.
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*/
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static void smc_close_passive_work(struct work_struct *work)
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{
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struct smc_connection *conn = container_of(work,
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struct smc_connection,
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close_work);
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struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
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struct smc_cdc_conn_state_flags *rxflags;
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bool release_clcsock = false;
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struct sock *sk = &smc->sk;
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int old_state;
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lock_sock(sk);
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old_state = sk->sk_state;
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rxflags = &conn->local_rx_ctrl.conn_state_flags;
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if (rxflags->peer_conn_abort) {
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/* peer has not received all data */
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smc_close_passive_abort_received(smc);
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release_sock(sk);
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cancel_delayed_work_sync(&conn->tx_work);
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lock_sock(sk);
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goto wakeup;
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}
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switch (sk->sk_state) {
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case SMC_INIT:
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sk->sk_state = SMC_APPCLOSEWAIT1;
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break;
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case SMC_ACTIVE:
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sk->sk_state = SMC_APPCLOSEWAIT1;
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/* postpone sock_put() for passive closing to cover
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* received SEND_SHUTDOWN as well
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*/
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break;
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case SMC_PEERCLOSEWAIT1:
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if (rxflags->peer_done_writing)
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sk->sk_state = SMC_PEERCLOSEWAIT2;
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fallthrough;
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/* to check for closing */
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case SMC_PEERCLOSEWAIT2:
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if (!smc_cdc_rxed_any_close(conn))
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break;
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if (sock_flag(sk, SOCK_DEAD) &&
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smc_close_sent_any_close(conn)) {
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/* smc_release has already been called locally */
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sk->sk_state = SMC_CLOSED;
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} else {
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/* just shutdown, but not yet closed locally */
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sk->sk_state = SMC_APPFINCLOSEWAIT;
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}
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sock_put(sk); /* passive closing */
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break;
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case SMC_PEERFINCLOSEWAIT:
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if (smc_cdc_rxed_any_close(conn)) {
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sk->sk_state = SMC_CLOSED;
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sock_put(sk); /* passive closing */
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}
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break;
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case SMC_APPCLOSEWAIT1:
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case SMC_APPCLOSEWAIT2:
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/* postpone sock_put() for passive closing to cover
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* received SEND_SHUTDOWN as well
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*/
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break;
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case SMC_APPFINCLOSEWAIT:
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case SMC_PEERABORTWAIT:
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case SMC_PROCESSABORT:
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case SMC_CLOSED:
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/* nothing to do, add tracing in future patch */
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break;
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}
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wakeup:
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sk->sk_data_ready(sk); /* wakeup blocked rcvbuf consumers */
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sk->sk_write_space(sk); /* wakeup blocked sndbuf producers */
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if (old_state != sk->sk_state) {
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sk->sk_state_change(sk);
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if ((sk->sk_state == SMC_CLOSED) &&
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(sock_flag(sk, SOCK_DEAD) || !sk->sk_socket)) {
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smc_conn_free(conn);
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if (smc->clcsock)
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release_clcsock = true;
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}
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}
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release_sock(sk);
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if (release_clcsock)
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smc_clcsock_release(smc);
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sock_put(sk); /* sock_hold done by schedulers of close_work */
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}
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int smc_close_shutdown_write(struct smc_sock *smc)
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{
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struct smc_connection *conn = &smc->conn;
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struct sock *sk = &smc->sk;
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int old_state;
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long timeout;
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int rc = 0;
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timeout = current->flags & PF_EXITING ?
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0 : sock_flag(sk, SOCK_LINGER) ?
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sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;
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old_state = sk->sk_state;
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again:
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switch (sk->sk_state) {
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case SMC_ACTIVE:
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smc_close_stream_wait(smc, timeout);
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release_sock(sk);
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cancel_delayed_work_sync(&conn->tx_work);
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lock_sock(sk);
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if (sk->sk_state != SMC_ACTIVE)
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goto again;
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/* send close wr request */
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rc = smc_close_wr(conn);
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sk->sk_state = SMC_PEERCLOSEWAIT1;
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break;
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case SMC_APPCLOSEWAIT1:
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/* passive close */
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if (!smc_cdc_rxed_any_close(conn))
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smc_close_stream_wait(smc, timeout);
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release_sock(sk);
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cancel_delayed_work_sync(&conn->tx_work);
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lock_sock(sk);
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if (sk->sk_state != SMC_APPCLOSEWAIT1)
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goto again;
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/* confirm close from peer */
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rc = smc_close_wr(conn);
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sk->sk_state = SMC_APPCLOSEWAIT2;
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break;
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case SMC_APPCLOSEWAIT2:
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case SMC_PEERFINCLOSEWAIT:
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case SMC_PEERCLOSEWAIT1:
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case SMC_PEERCLOSEWAIT2:
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case SMC_APPFINCLOSEWAIT:
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case SMC_PROCESSABORT:
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case SMC_PEERABORTWAIT:
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/* nothing to do, add tracing in future patch */
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break;
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}
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if (old_state != sk->sk_state)
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sk->sk_state_change(sk);
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return rc;
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}
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/* Initialize close properties on connection establishment. */
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void smc_close_init(struct smc_sock *smc)
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{
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INIT_WORK(&smc->conn.close_work, smc_close_passive_work);
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}
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