442 lines
11 KiB
C
442 lines
11 KiB
C
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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 <net/sock.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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#define SMC_CLOSE_WAIT_TX_PENDS_TIME (5 * HZ)
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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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static void smc_close_wait_tx_pends(struct smc_sock *smc)
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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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signed long timeout;
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timeout = SMC_CLOSE_WAIT_TX_PENDS_TIME;
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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_cdc_tx_has_pending(&smc->conn),
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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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}
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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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&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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return smc_cdc_get_slot_and_msg_send(conn);
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}
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static 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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/* terminate smc socket abnormally - active abort
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* 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 smc_cdc_conn_state_flags *txflags =
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&smc->conn.local_tx_ctrl.conn_state_flags;
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bh_lock_sock(&smc->sk);
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smc->sk.sk_err = ECONNABORTED;
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if (smc->clcsock && smc->clcsock->sk) {
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smc->clcsock->sk->sk_err = ECONNABORTED;
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smc->clcsock->sk->sk_state_change(smc->clcsock->sk);
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}
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switch (smc->sk.sk_state) {
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case SMC_INIT:
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smc->sk.sk_state = SMC_PEERABORTWAIT;
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break;
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case SMC_APPCLOSEWAIT1:
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case SMC_APPCLOSEWAIT2:
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txflags->peer_conn_abort = 1;
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sock_release(smc->clcsock);
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if (!smc_cdc_rxed_any_close(&smc->conn))
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smc->sk.sk_state = SMC_PEERABORTWAIT;
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else
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smc->sk.sk_state = SMC_CLOSED;
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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_conn_closed) {
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smc->sk.sk_state = SMC_PEERABORTWAIT;
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txflags->peer_conn_abort = 1;
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sock_release(smc->clcsock);
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} else {
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smc->sk.sk_state = SMC_CLOSED;
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}
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break;
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case SMC_PROCESSABORT:
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case SMC_APPFINCLOSEWAIT:
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if (!txflags->peer_conn_closed) {
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txflags->peer_conn_abort = 1;
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sock_release(smc->clcsock);
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}
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smc->sk.sk_state = SMC_CLOSED;
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break;
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case SMC_PEERFINCLOSEWAIT:
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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(&smc->sk, SOCK_DEAD);
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bh_unlock_sock(&smc->sk);
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smc->sk.sk_state_change(&smc->sk);
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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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long timeout = SMC_MAX_STREAM_WAIT_TIMEOUT;
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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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int rc = 0;
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if (sock_flag(sk, SOCK_LINGER) &&
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!(current->flags & PF_EXITING))
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timeout = sk->sk_lingertime;
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again:
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old_state = sk->sk_state;
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switch (old_state) {
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case SMC_INIT:
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sk->sk_state = SMC_CLOSED;
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if (smc->smc_listen_work.func)
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flush_work(&smc->smc_listen_work);
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sock_put(sk);
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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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rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
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/* wake up kernel_accept of smc_tcp_listen_worker */
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smc->clcsock->sk->sk_data_ready(smc->clcsock->sk);
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}
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release_sock(sk);
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smc_close_cleanup_listen(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_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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} 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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!txflags->peer_conn_closed) {
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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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smc_close_wait_tx_pends(smc);
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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_work_sync(&conn->tx_work);
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lock_sock(sk);
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if (sk->sk_err != ECONNABORTED) {
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/* confirm close from peer */
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rc = smc_close_final(conn);
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if (rc)
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break;
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}
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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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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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smc_close_wait_tx_pends(smc);
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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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/* peer sending PeerConnectionClosed will cause transition */
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break;
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case SMC_PROCESSABORT:
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cancel_work_sync(&conn->tx_work);
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smc_close_abort(conn);
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sk->sk_state = SMC_CLOSED;
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smc_close_wait_tx_pends(smc);
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break;
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case SMC_PEERABORTWAIT:
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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(&smc->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_ACTIVE:
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case SMC_APPFINCLOSEWAIT:
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case SMC_APPCLOSEWAIT1:
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case SMC_APPCLOSEWAIT2:
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smc_close_abort(&smc->conn);
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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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!txflags->peer_conn_closed) {
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/* just shutdown, but not yet closed locally */
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smc_close_abort(&smc->conn);
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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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}
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break;
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case SMC_PEERFINCLOSEWAIT:
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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_INIT:
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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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/* Some kind of closing has been received: peer_conn_closed, peer_conn_abort,
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* or peer_done_writing.
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* Called under tasklet context.
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*/
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void smc_close_passive_received(struct smc_sock *smc)
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{
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struct smc_cdc_conn_state_flags *rxflags =
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&smc->conn.local_rx_ctrl.conn_state_flags;
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struct sock *sk = &smc->sk;
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int old_state;
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sk->sk_shutdown |= RCV_SHUTDOWN;
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if (smc->clcsock && smc->clcsock->sk)
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smc->clcsock->sk->sk_shutdown |= RCV_SHUTDOWN;
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sock_set_flag(&smc->sk, SOCK_DONE);
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old_state = sk->sk_state;
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if (rxflags->peer_conn_abort) {
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smc_close_passive_abort_received(smc);
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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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if (atomic_read(&smc->conn.bytes_to_rcv) ||
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(rxflags->peer_done_writing &&
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!rxflags->peer_conn_closed))
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sk->sk_state = SMC_APPCLOSEWAIT1;
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else
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sk->sk_state = SMC_CLOSED;
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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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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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/* fall through to check for closing */
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case SMC_PEERCLOSEWAIT2:
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case SMC_PEERFINCLOSEWAIT:
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if (!smc_cdc_rxed_any_close(&smc->conn))
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break;
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if (sock_flag(sk, SOCK_DEAD) &&
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(sk->sk_shutdown == SHUTDOWN_MASK)) {
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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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break;
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case SMC_APPCLOSEWAIT1:
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case SMC_APPCLOSEWAIT2:
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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 */
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
wakeup:
|
||
|
|
if (old_state != sk->sk_state)
|
||
|
|
sk->sk_state_change(sk);
|
||
|
|
sk->sk_data_ready(sk); /* wakeup blocked rcvbuf consumers */
|
||
|
|
sk->sk_write_space(sk); /* wakeup blocked sndbuf producers */
|
||
|
|
|
||
|
|
if ((sk->sk_state == SMC_CLOSED) &&
|
||
|
|
(sock_flag(sk, SOCK_DEAD) || (old_state == SMC_INIT))) {
|
||
|
|
smc_conn_free(&smc->conn);
|
||
|
|
schedule_delayed_work(&smc->sock_put_work,
|
||
|
|
SMC_CLOSE_SOCK_PUT_DELAY);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void smc_close_sock_put_work(struct work_struct *work)
|
||
|
|
{
|
||
|
|
struct smc_sock *smc = container_of(to_delayed_work(work),
|
||
|
|
struct smc_sock,
|
||
|
|
sock_put_work);
|
||
|
|
|
||
|
|
sock_put(&smc->sk);
|
||
|
|
}
|
||
|
|
|
||
|
|
int smc_close_shutdown_write(struct smc_sock *smc)
|
||
|
|
{
|
||
|
|
struct smc_connection *conn = &smc->conn;
|
||
|
|
long timeout = SMC_MAX_STREAM_WAIT_TIMEOUT;
|
||
|
|
struct sock *sk = &smc->sk;
|
||
|
|
int old_state;
|
||
|
|
int rc = 0;
|
||
|
|
|
||
|
|
if (sock_flag(sk, SOCK_LINGER))
|
||
|
|
timeout = sk->sk_lingertime;
|
||
|
|
|
||
|
|
again:
|
||
|
|
old_state = sk->sk_state;
|
||
|
|
switch (old_state) {
|
||
|
|
case SMC_ACTIVE:
|
||
|
|
smc_close_stream_wait(smc, timeout);
|
||
|
|
release_sock(sk);
|
||
|
|
cancel_work_sync(&conn->tx_work);
|
||
|
|
lock_sock(sk);
|
||
|
|
/* send close wr request */
|
||
|
|
rc = smc_close_wr(conn);
|
||
|
|
if (sk->sk_state == SMC_ACTIVE)
|
||
|
|
sk->sk_state = SMC_PEERCLOSEWAIT1;
|
||
|
|
else
|
||
|
|
goto again;
|
||
|
|
break;
|
||
|
|
case SMC_APPCLOSEWAIT1:
|
||
|
|
/* passive close */
|
||
|
|
if (!smc_cdc_rxed_any_close(conn))
|
||
|
|
smc_close_stream_wait(smc, timeout);
|
||
|
|
release_sock(sk);
|
||
|
|
cancel_work_sync(&conn->tx_work);
|
||
|
|
lock_sock(sk);
|
||
|
|
/* confirm close from peer */
|
||
|
|
rc = smc_close_wr(conn);
|
||
|
|
sk->sk_state = SMC_APPCLOSEWAIT2;
|
||
|
|
break;
|
||
|
|
case SMC_APPCLOSEWAIT2:
|
||
|
|
case SMC_PEERFINCLOSEWAIT:
|
||
|
|
case SMC_PEERCLOSEWAIT1:
|
||
|
|
case SMC_PEERCLOSEWAIT2:
|
||
|
|
case SMC_APPFINCLOSEWAIT:
|
||
|
|
case SMC_PROCESSABORT:
|
||
|
|
case SMC_PEERABORTWAIT:
|
||
|
|
/* nothing to do, add tracing in future patch */
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (old_state != sk->sk_state)
|
||
|
|
sk->sk_state_change(&smc->sk);
|
||
|
|
return rc;
|
||
|
|
}
|