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505 lines
13 KiB
505 lines
13 KiB
// 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 <[email protected]> |
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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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/* Send out corked data remaining in sndbuf */ |
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smc_tx_pending(&smc->conn); |
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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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write_lock_bh(&smc->clcsock->sk->sk_callback_lock); |
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smc_clcsock_restore_cb(&smc->clcsock->sk->sk_data_ready, |
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&smc->clcsk_data_ready); |
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smc->clcsock->sk->sk_user_data = NULL; |
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write_unlock_bh(&smc->clcsock->sk->sk_callback_lock); |
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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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