diff options
Diffstat (limited to 'net')
| -rw-r--r-- | net/smc/Makefile | 2 | ||||
| -rw-r--r-- | net/smc/af_smc.c | 127 | ||||
| -rw-r--r-- | net/smc/smc.h | 18 | ||||
| -rw-r--r-- | net/smc/smc_cdc.c | 23 | ||||
| -rw-r--r-- | net/smc/smc_cdc.h | 1 | ||||
| -rw-r--r-- | net/smc/smc_close.c | 441 | ||||
| -rw-r--r-- | net/smc/smc_close.h | 28 | ||||
| -rw-r--r-- | net/smc/smc_core.c | 7 | ||||
| -rw-r--r-- | net/smc/smc_tx.c | 8 | ||||
| -rw-r--r-- | net/smc/smc_wr.c | 47 | ||||
| -rw-r--r-- | net/smc/smc_wr.h | 2 |
11 files changed, 668 insertions, 36 deletions
diff --git a/net/smc/Makefile b/net/smc/Makefile index 6255e29..5cf0caf 100644 --- a/net/smc/Makefile +++ b/net/smc/Makefile @@ -1,3 +1,3 @@ obj-$(CONFIG_SMC) += smc.o smc-y := af_smc.o smc_pnet.o smc_ib.o smc_clc.o smc_core.o smc_wr.o smc_llc.o -smc-y += smc_cdc.o smc_tx.o smc_rx.o +smc-y += smc_cdc.o smc_tx.o smc_rx.o smc_close.o diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index fc9c51c..3f543d5 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -39,6 +39,7 @@ #include "smc_pnet.h" #include "smc_tx.h" #include "smc_rx.h" +#include "smc_close.h" static DEFINE_MUTEX(smc_create_lgr_pending); /* serialize link group * creation @@ -70,14 +71,29 @@ static int smc_release(struct socket *sock) { struct sock *sk = sock->sk; struct smc_sock *smc; + int rc = 0; if (!sk) goto out; smc = smc_sk(sk); - lock_sock(sk); + sock_hold(sk); + if (sk->sk_state == SMC_LISTEN) + /* smc_close_non_accepted() is called and acquires + * sock lock for child sockets again + */ + lock_sock_nested(sk, SINGLE_DEPTH_NESTING); + else + lock_sock(sk); - sk->sk_state = SMC_CLOSED; + if (smc->use_fallback) { + sk->sk_state = SMC_CLOSED; + sk->sk_state_change(sk); + } else { + rc = smc_close_active(smc); + sock_set_flag(sk, SOCK_DEAD); + sk->sk_shutdown |= SHUTDOWN_MASK; + } if (smc->clcsock) { sock_release(smc->clcsock); smc->clcsock = NULL; @@ -86,11 +102,18 @@ static int smc_release(struct socket *sock) /* detach socket */ sock_orphan(sk); sock->sk = NULL; + if (smc->use_fallback) { + schedule_delayed_work(&smc->sock_put_work, TCP_TIMEWAIT_LEN); + } else if (sk->sk_state == SMC_CLOSED) { + smc_conn_free(&smc->conn); + schedule_delayed_work(&smc->sock_put_work, + SMC_CLOSE_SOCK_PUT_DELAY); + } release_sock(sk); sock_put(sk); out: - return 0; + return rc; } static void smc_destruct(struct sock *sk) @@ -120,6 +143,7 @@ static struct sock *smc_sock_alloc(struct net *net, struct socket *sock) INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); INIT_LIST_HEAD(&smc->accept_q); spin_lock_init(&smc->accept_q_lock); + INIT_DELAYED_WORK(&smc->sock_put_work, smc_close_sock_put_work); sk_refcnt_debug_inc(sk); return sk; @@ -417,7 +441,8 @@ static int smc_connect_rdma(struct smc_sock *smc) out_connected: smc_copy_sock_settings_to_clc(smc); - smc->sk.sk_state = SMC_ACTIVE; + if (smc->sk.sk_state == SMC_INIT) + smc->sk.sk_state = SMC_ACTIVE; return rc ? rc : local_contact; @@ -559,8 +584,8 @@ static void smc_accept_unlink(struct sock *sk) /* remove a sock from the accept queue to bind it to a new socket created * for a socket accept call from user space */ -static struct sock *smc_accept_dequeue(struct sock *parent, - struct socket *new_sock) +struct sock *smc_accept_dequeue(struct sock *parent, + struct socket *new_sock) { struct smc_sock *isk, *n; struct sock *new_sk; @@ -581,11 +606,17 @@ static struct sock *smc_accept_dequeue(struct sock *parent, } /* clean up for a created but never accepted sock */ -static void smc_close_non_accepted(struct sock *sk) +void smc_close_non_accepted(struct sock *sk) { struct smc_sock *smc = smc_sk(sk); sock_hold(sk); + lock_sock(sk); + if (!sk->sk_lingertime) + /* wait for peer closing */ + sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT; + if (!smc->use_fallback) + smc_close_active(smc); if (smc->clcsock) { struct socket *tcp; @@ -593,7 +624,16 @@ static void smc_close_non_accepted(struct sock *sk) smc->clcsock = NULL; sock_release(tcp); } - /* more closing stuff to be added with socket closing patch */ + sock_set_flag(sk, SOCK_DEAD); + sk->sk_shutdown |= SHUTDOWN_MASK; + if (smc->use_fallback) { + schedule_delayed_work(&smc->sock_put_work, TCP_TIMEWAIT_LEN); + } else { + smc_conn_free(&smc->conn); + schedule_delayed_work(&smc->sock_put_work, + SMC_CLOSE_SOCK_PUT_DELAY); + } + release_sock(sk); sock_put(sk); } @@ -761,11 +801,12 @@ static void smc_listen_work(struct work_struct *work) out_connected: sk_refcnt_debug_inc(newsmcsk); - newsmcsk->sk_state = SMC_ACTIVE; + if (newsmcsk->sk_state == SMC_INIT) + newsmcsk->sk_state = SMC_ACTIVE; enqueue: if (local_contact == SMC_FIRST_CONTACT) mutex_unlock(&smc_create_lgr_pending); - lock_sock(&lsmc->sk); + lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); if (lsmc->sk.sk_state == SMC_LISTEN) { smc_accept_enqueue(&lsmc->sk, newsmcsk); } else { /* no longer listening */ @@ -791,6 +832,7 @@ decline_rdma: out_err: newsmcsk->sk_state = SMC_CLOSED; + smc_conn_free(&new_smc->conn); goto enqueue; /* queue new sock with sk_err set */ } @@ -911,7 +953,8 @@ static int smc_getname(struct socket *sock, struct sockaddr *addr, { struct smc_sock *smc; - if (peer && (sock->sk->sk_state != SMC_ACTIVE)) + if (peer && (sock->sk->sk_state != SMC_ACTIVE) && + (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) return -ENOTCONN; smc = smc_sk(sock->sk); @@ -927,7 +970,9 @@ static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) smc = smc_sk(sk); lock_sock(sk); - if (sk->sk_state != SMC_ACTIVE) + if ((sk->sk_state != SMC_ACTIVE) && + (sk->sk_state != SMC_APPCLOSEWAIT1) && + (sk->sk_state != SMC_INIT)) goto out; if (smc->use_fallback) rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); @@ -947,13 +992,21 @@ static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, smc = smc_sk(sk); lock_sock(sk); - if ((sk->sk_state != SMC_ACTIVE) && (sk->sk_state != SMC_CLOSED)) + if ((sk->sk_state == SMC_INIT) || + (sk->sk_state == SMC_LISTEN) || + (sk->sk_state == SMC_CLOSED)) + goto out; + + if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { + rc = 0; goto out; + } if (smc->use_fallback) rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); else rc = smc_rx_recvmsg(smc, msg, len, flags); + out: release_sock(sk); return rc; @@ -1013,7 +1066,8 @@ static unsigned int smc_poll(struct file *file, struct socket *sock, mask |= smc_accept_poll(sk); if (sk->sk_err) mask |= POLLERR; - if (atomic_read(&smc->conn.sndbuf_space)) { + if (atomic_read(&smc->conn.sndbuf_space) || + (sk->sk_shutdown & SEND_SHUTDOWN)) { mask |= POLLOUT | POLLWRNORM; } else { sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); @@ -1021,7 +1075,14 @@ static unsigned int smc_poll(struct file *file, struct socket *sock, } if (atomic_read(&smc->conn.bytes_to_rcv)) mask |= POLLIN | POLLRDNORM; - /* for now - to be enhanced in follow-on patch */ + if ((sk->sk_shutdown == SHUTDOWN_MASK) || + (sk->sk_state == SMC_CLOSED)) + mask |= POLLHUP; + if (sk->sk_shutdown & RCV_SHUTDOWN) + mask |= POLLIN | POLLRDNORM | POLLRDHUP; + if (sk->sk_state == SMC_APPCLOSEWAIT1) + mask |= POLLIN; + } return mask; @@ -1032,31 +1093,53 @@ static int smc_shutdown(struct socket *sock, int how) struct sock *sk = sock->sk; struct smc_sock *smc; int rc = -EINVAL; + int rc1 = 0; smc = smc_sk(sk); if ((how < SHUT_RD) || (how > SHUT_RDWR)) - goto out_err; + return rc; lock_sock(sk); rc = -ENOTCONN; - if (sk->sk_state == SMC_CLOSED) + if ((sk->sk_state != SMC_LISTEN) && + (sk->sk_state != SMC_ACTIVE) && + (sk->sk_state != SMC_PEERCLOSEWAIT1) && + (sk->sk_state != SMC_PEERCLOSEWAIT2) && + (sk->sk_state != SMC_APPCLOSEWAIT1) && + (sk->sk_state != SMC_APPCLOSEWAIT2) && + (sk->sk_state != SMC_APPFINCLOSEWAIT)) goto out; if (smc->use_fallback) { rc = kernel_sock_shutdown(smc->clcsock, how); sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; if (sk->sk_shutdown == SHUTDOWN_MASK) sk->sk_state = SMC_CLOSED; - } else { - rc = sock_no_shutdown(sock, how); + goto out; + } + switch (how) { + case SHUT_RDWR: /* shutdown in both directions */ + rc = smc_close_active(smc); + break; + case SHUT_WR: + rc = smc_close_shutdown_write(smc); + break; + case SHUT_RD: + if (sk->sk_state == SMC_LISTEN) + rc = smc_close_active(smc); + else + rc = 0; + /* nothing more to do because peer is not involved */ + break; } + rc1 = kernel_sock_shutdown(smc->clcsock, how); + /* map sock_shutdown_cmd constants to sk_shutdown value range */ + sk->sk_shutdown |= how + 1; out: release_sock(sk); - -out_err: - return rc; + return rc ? rc : rc1; } static int smc_setsockopt(struct socket *sock, int level, int optname, diff --git a/net/smc/smc.h b/net/smc/smc.h index 2bb1540..959a5d2 100644 --- a/net/smc/smc.h +++ b/net/smc/smc.h @@ -30,6 +30,16 @@ enum smc_state { /* possible states of an SMC socket */ SMC_INIT = 2, SMC_CLOSED = 7, SMC_LISTEN = 10, + /* normal close */ + SMC_PEERCLOSEWAIT1 = 20, + SMC_PEERCLOSEWAIT2 = 21, + SMC_APPFINCLOSEWAIT = 24, + SMC_APPCLOSEWAIT1 = 22, + SMC_APPCLOSEWAIT2 = 23, + SMC_PEERFINCLOSEWAIT = 25, + /* abnormal close */ + SMC_PEERABORTWAIT = 26, + SMC_PROCESSABORT = 27, }; struct smc_link_group; @@ -164,7 +174,13 @@ struct smc_sock { /* smc sock container */ struct work_struct smc_listen_work;/* prepare new accept socket */ struct list_head accept_q; /* sockets to be accepted */ spinlock_t accept_q_lock; /* protects accept_q */ + struct delayed_work sock_put_work; /* final socket freeing */ bool use_fallback; /* fallback to tcp */ + u8 wait_close_tx_prepared : 1; + /* shutdown wr or close + * started, waiting for unsent + * data to be sent + */ }; static inline struct smc_sock *smc_sk(const struct sock *sk) @@ -250,5 +266,7 @@ void smc_conn_free(struct smc_connection *conn); int smc_conn_create(struct smc_sock *smc, __be32 peer_in_addr, struct smc_ib_device *smcibdev, u8 ibport, struct smc_clc_msg_local *lcl, int srv_first_contact); +struct sock *smc_accept_dequeue(struct sock *parent, struct socket *new_sock); +void smc_close_non_accepted(struct sock *sk); #endif /* __SMC_H */ diff --git a/net/smc/smc_cdc.c b/net/smc/smc_cdc.c index c0a6930..5a33949 100644 --- a/net/smc/smc_cdc.c +++ b/net/smc/smc_cdc.c @@ -16,6 +16,7 @@ #include "smc_cdc.h" #include "smc_tx.h" #include "smc_rx.h" +#include "smc_close.h" /********************************** send *************************************/ @@ -55,6 +56,9 @@ static void smc_cdc_tx_handler(struct smc_wr_tx_pend_priv *pnd_snd, cdcpend->conn); } smc_tx_sndbuf_nonfull(smc); + if (smc->sk.sk_state != SMC_ACTIVE) + /* wake up smc_close_wait_tx_pends() */ + smc->sk.sk_state_change(&smc->sk); bh_unlock_sock(&smc->sk); } @@ -149,6 +153,14 @@ void smc_cdc_tx_dismiss_slots(struct smc_connection *conn) (unsigned long)conn); } +bool smc_cdc_tx_has_pending(struct smc_connection *conn) +{ + struct smc_link *link = &conn->lgr->lnk[SMC_SINGLE_LINK]; + + return smc_wr_tx_has_pending(link, SMC_CDC_MSG_TYPE, + smc_cdc_tx_filter, (unsigned long)conn); +} + /********************************* receive ***********************************/ static inline bool smc_cdc_before(u16 seq1, u16 seq2) @@ -201,15 +213,20 @@ static void smc_cdc_msg_recv_action(struct smc_sock *smc, smc->sk.sk_data_ready(&smc->sk); } - if (conn->local_rx_ctrl.conn_state_flags.peer_conn_abort) + if (conn->local_rx_ctrl.conn_state_flags.peer_conn_abort) { smc->sk.sk_err = ECONNRESET; + conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1; + } if (smc_cdc_rxed_any_close_or_senddone(conn)) - /* subsequent patch: terminate connection */ + smc_close_passive_received(smc); /* piggy backed tx info */ /* trigger sndbuf consumer: RDMA write into peer RMBE and CDC */ - if (diff_cons && smc_tx_prepared_sends(conn)) + if (diff_cons && smc_tx_prepared_sends(conn)) { smc_tx_sndbuf_nonempty(conn); + /* trigger socket release if connection closed */ + smc_close_wake_tx_prepared(smc); + } /* subsequent patch: trigger socket release if connection closed */ diff --git a/net/smc/smc_cdc.h b/net/smc/smc_cdc.h index 135f613..8e1d76f 100644 --- a/net/smc/smc_cdc.h +++ b/net/smc/smc_cdc.h @@ -212,6 +212,7 @@ void smc_cdc_tx_dismiss_slots(struct smc_connection *conn); int smc_cdc_msg_send(struct smc_connection *conn, struct smc_wr_buf *wr_buf, struct smc_cdc_tx_pend *pend); int smc_cdc_get_slot_and_msg_send(struct smc_connection *conn); +bool smc_cdc_tx_has_pending(struct smc_connection *conn); int smc_cdc_init(void) __init; #endif /* SMC_CDC_H */ diff --git a/net/smc/smc_close.c b/net/smc/smc_close.c new file mode 100644 index 0000000..d70c05b --- /dev/null +++ b/net/smc/smc_close.c @@ -0,0 +1,441 @@ +/* + * Shared Memory Communications over RDMA (SMC-R) and RoCE + * + * Socket Closing - normal and abnormal + * + * Copyright IBM Corp. 2016 + * + * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> + */ + +#include <linux/workqueue.h> +#include <net/sock.h> + +#include "smc.h" +#include "smc_tx.h" +#include "smc_cdc.h" +#include "smc_close.h" + +#define SMC_CLOSE_WAIT_TX_PENDS_TIME (5 * HZ) + +static void smc_close_cleanup_listen(struct sock *parent) +{ + struct sock *sk; + + /* Close non-accepted connections */ + while ((sk = smc_accept_dequeue(parent, NULL))) + smc_close_non_accepted(sk); +} + +static void smc_close_wait_tx_pends(struct smc_sock *smc) +{ + DEFINE_WAIT_FUNC(wait, woken_wake_function); + struct sock *sk = &smc->sk; + signed long timeout; + + timeout = SMC_CLOSE_WAIT_TX_PENDS_TIME; + add_wait_queue(sk_sleep(sk), &wait); + while (!signal_pending(current) && timeout) { + int rc; + + rc = sk_wait_event(sk, &timeout, + !smc_cdc_tx_has_pending(&smc->conn), + &wait); + if (rc) + break; + } + remove_wait_queue(sk_sleep(sk), &wait); +} + +/* wait for sndbuf data being transmitted */ +static void smc_close_stream_wait(struct smc_sock *smc, long timeout) +{ + DEFINE_WAIT_FUNC(wait, woken_wake_function); + struct sock *sk = &smc->sk; + + if (!timeout) + return; + + if (!smc_tx_prepared_sends(&smc->conn)) + return; + + smc->wait_close_tx_prepared = 1; + add_wait_queue(sk_sleep(sk), &wait); + while (!signal_pending(current) && timeout) { + int rc; + + rc = sk_wait_event(sk, &timeout, + !smc_tx_prepared_sends(&smc->conn) || + (sk->sk_err == ECONNABORTED) || + (sk->sk_err == ECONNRESET), + &wait); + if (rc) + break; + } + remove_wait_queue(sk_sleep(sk), &wait); + smc->wait_close_tx_prepared = 0; +} + +void smc_close_wake_tx_prepared(struct smc_sock *smc) +{ + if (smc->wait_close_tx_prepared) + /* wake up socket closing */ + smc->sk.sk_state_change(&smc->sk); +} + +static int smc_close_wr(struct smc_connection *conn) +{ + conn->local_tx_ctrl.conn_state_flags.peer_done_writing = 1; + + return smc_cdc_get_slot_and_msg_send(conn); +} + +static int smc_close_final(struct smc_connection *conn) +{ + if (atomic_read(&conn->bytes_to_rcv)) + conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1; + else + conn->local_tx_ctrl.conn_state_flags.peer_conn_closed = 1; + + return smc_cdc_get_slot_and_msg_send(conn); +} + +static int smc_close_abort(struct smc_connection *conn) +{ + conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1; + + return smc_cdc_get_slot_and_msg_send(conn); +} + +/* terminate smc socket abnormally - active abort + * RDMA communication no longer possible + */ +void smc_close_active_abort(struct smc_sock *smc) +{ + struct smc_cdc_conn_state_flags *txflags = + &smc->conn.local_tx_ctrl.conn_state_flags; + + bh_lock_sock(&smc->sk); + smc->sk.sk_err = ECONNABORTED; + if (smc->clcsock && smc->clcsock->sk) { + smc->clcsock->sk->sk_err = ECONNABORTED; + smc->clcsock->sk->sk_state_change(smc->clcsock->sk); + } + switch (smc->sk.sk_state) { + case SMC_INIT: + smc->sk.sk_state = SMC_PEERABORTWAIT; + break; + case SMC_APPCLOSEWAIT1: + case SMC_APPCLOSEWAIT2: + txflags->peer_conn_abort = 1; + sock_release(smc->clcsock); + if (!smc_cdc_rxed_any_close(&smc->conn)) + smc->sk.sk_state = SMC_PEERABORTWAIT; + else + smc->sk.sk_state = SMC_CLOSED; + break; + case SMC_PEERCLOSEWAIT1: + case SMC_PEERCLOSEWAIT2: + if (!txflags->peer_conn_closed) { + smc->sk.sk_state = SMC_PEERABORTWAIT; + txflags->peer_conn_abort = 1; + sock_release(smc->clcsock); + } else { + smc->sk.sk_state = SMC_CLOSED; + } + break; + case SMC_PROCESSABORT: + case SMC_APPFINCLOSEWAIT: + if (!txflags->peer_conn_closed) { + txflags->peer_conn_abort = 1; + sock_release(smc->clcsock); + } + smc->sk.sk_state = SMC_CLOSED; + break; + case SMC_PEERFINCLOSEWAIT: + case SMC_PEERABORTWAIT: + case SMC_CLOSED: + break; + } + + sock_set_flag(&smc->sk, SOCK_DEAD); + bh_unlock_sock(&smc->sk); + smc->sk.sk_state_change(&smc->sk); +} + +int smc_close_active(struct smc_sock *smc) +{ + struct smc_cdc_conn_state_flags *txflags = + &smc->conn.local_tx_ctrl.conn_state_flags; + long timeout = SMC_MAX_STREAM_WAIT_TIMEOUT; + struct smc_connection *conn = &smc->conn; + struct sock *sk = &smc->sk; + int old_state; + int rc = 0; + + if (sock_flag(sk, SOCK_LINGER) && + !(current->flags & PF_EXITING)) + timeout = sk->sk_lingertime; + +again: + old_state = sk->sk_state; + switch (old_state) { + case SMC_INIT: + sk->sk_state = SMC_CLOSED; + if (smc->smc_listen_work.func) + flush_work(&smc->smc_listen_work); + sock_put(sk); + break; + case SMC_LISTEN: + sk->sk_state = SMC_CLOSED; + sk->sk_state_change(sk); /* wake up accept */ + if (smc->clcsock && smc->clcsock->sk) { + rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR); + /* wake up kernel_accept of smc_tcp_listen_worker */ + smc->clcsock->sk->sk_data_ready(smc->clcsock->sk); + } + release_sock(sk); + smc_close_cleanup_listen(sk); + flush_work(&smc->tcp_listen_work); + lock_sock(sk); + break; + case SMC_ACTIVE: + smc_close_stream_wait(smc, timeout); + release_sock(sk); + cancel_work_sync(&conn->tx_work); + lock_sock(sk); + if (sk->sk_state == SMC_ACTIVE) { + /* send close request */ + rc = smc_close_final(conn); + sk->sk_state = SMC_PEERCLOSEWAIT1; + } else { + /* peer event has changed the state */ + goto again; + } + break; + case SMC_APPFINCLOSEWAIT: + /* socket already shutdown wr or both (active close) */ + if (txflags->peer_done_writing && + !txflags->peer_conn_closed) { + /* just shutdown wr done, send close request */ + rc = smc_close_final(conn); + } + sk->sk_state = SMC_CLOSED; + smc_close_wait_tx_pends(smc); + break; + case SMC_APPCLOSEWAIT1: + case SMC_APPCLOSEWAIT2: + 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); + if (sk->sk_err != ECONNABORTED) { + /* confirm close from peer */ + rc = smc_close_final(conn); + if (rc) + break; + } + if (smc_cdc_rxed_any_close(conn)) + /* peer has closed the socket already */ + sk->sk_state = SMC_CLOSED; + else + /* peer has just issued a shutdown write */ + sk->sk_state = SMC_PEERFINCLOSEWAIT; + smc_close_wait_tx_pends(smc); + break; + case SMC_PEERCLOSEWAIT1: + case SMC_PEERCLOSEWAIT2: + case SMC_PEERFINCLOSEWAIT: + /* peer sending PeerConnectionClosed will cause transition */ + break; + case SMC_PROCESSABORT: + cancel_work_sync(&conn->tx_work); + smc_close_abort(conn); + sk->sk_state = SMC_CLOSED; + smc_close_wait_tx_pends(smc); + break; + case SMC_PEERABORTWAIT: + case SMC_CLOSED: + /* nothing to do, add tracing in future patch */ + break; + } + + if (old_state != sk->sk_state) + sk->sk_state_change(&smc->sk); + return rc; +} + +static void smc_close_passive_abort_received(struct smc_sock *smc) +{ + struct smc_cdc_conn_state_flags *txflags = + &smc->conn.local_tx_ctrl.conn_state_flags; + struct sock *sk = &smc->sk; + + switch (sk->sk_state) { + case SMC_ACTIVE: + case SMC_APPFINCLOSEWAIT: + case SMC_APPCLOSEWAIT1: + case SMC_APPCLOSEWAIT2: + smc_close_abort(&smc->conn); + sk->sk_state = SMC_PROCESSABORT; + break; + case SMC_PEERCLOSEWAIT1: + case SMC_PEERCLOSEWAIT2: + if (txflags->peer_done_writing && + !txflags->peer_conn_closed) { + /* just shutdown, but not yet closed locally */ + smc_close_abort(&smc->conn); + sk->sk_state = SMC_PROCESSABORT; + } else { + sk->sk_state = SMC_CLOSED; + } + break; + case SMC_PEERFINCLOSEWAIT: + case SMC_PEERABORTWAIT: + sk->sk_state = SMC_CLOSED; + break; + case SMC_INIT: + case SMC_PROCESSABORT: + /* nothing to do, add tracing in future patch */ + break; + } +} + +/* Some kind of closing has been received: peer_conn_closed, peer_conn_abort, + * or peer_done_writing. + * Called under tasklet context. + */ +void smc_close_passive_received(struct smc_sock *smc) +{ + struct smc_cdc_conn_state_flags *rxflags = + &smc->conn.local_rx_ctrl.conn_state_flags; + struct sock *sk = &smc->sk; + int old_state; + + sk->sk_shutdown |= RCV_SHUTDOWN; + if (smc->clcsock && smc->clcsock->sk) + smc->clcsock->sk->sk_shutdown |= RCV_SHUTDOWN; + sock_set_flag(&smc->sk, SOCK_DONE); + + old_state = sk->sk_state; + + if (rxflags->peer_conn_abort) { + smc_close_passive_abort_received(smc); + goto wakeup; + } + + switch (sk->sk_state) { + case SMC_INIT: + if (atomic_read(&smc->conn.bytes_to_rcv) || + (rxflags->peer_done_writing && + !rxflags->peer_conn_closed)) + sk->sk_state = SMC_APPCLOSEWAIT1; + else + sk->sk_state = SMC_CLOSED; + break; + case SMC_ACTIVE: + sk->sk_state = SMC_APPCLOSEWAIT1; + break; + case SMC_PEERCLOSEWAIT1: + if (rxflags->peer_done_writing) + sk->sk_state = SMC_PEERCLOSEWAIT2; + /* fall through to check for closing */ + case SMC_PEERCLOSEWAIT2: + case SMC_PEERFINCLOSEWAIT: + if (!smc_cdc_rxed_any_close(&smc->conn)) + break; + if (sock_flag(sk, SOCK_DEAD) && + (sk->sk_shutdown == SHUTDOWN_MASK)) { + /* smc_release has already been called locally */ + sk->sk_state = SMC_CLOSED; + } else { + /* just shutdown, but not yet closed locally */ + sk->sk_state = SMC_APPFINCLOSEWAIT; + } + break; + case SMC_APPCLOSEWAIT1: + case SMC_APPCLOSEWAIT2: + case SMC_APPFINCLOSEWAIT: + case SMC_PEERABORTWAIT: + case SMC_PROCESSABORT: + case SMC_CLOSED: + /* 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; +} diff --git a/net/smc/smc_close.h b/net/smc/smc_close.h new file mode 100644 index 0000000..bc9a2df --- /dev/null +++ b/net/smc/smc_close.h @@ -0,0 +1,28 @@ +/* + * Shared Memory Communications over RDMA (SMC-R) and RoCE + * + * Socket Closing + * + * Copyright IBM Corp. 2016 + * + * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> + */ + +#ifndef SMC_CLOSE_H +#define SMC_CLOSE_H + +#include <linux/workqueue.h> + +#include "smc.h" + +#define SMC_MAX_STREAM_WAIT_TIMEOUT (2 * HZ) +#define SMC_CLOSE_SOCK_PUT_DELAY HZ + +void smc_close_wake_tx_prepared(struct smc_sock *smc); +void smc_close_active_abort(struct smc_sock *smc); +int smc_close_active(struct smc_sock *smc); +void smc_close_passive_received(struct smc_sock *smc); +void smc_close_sock_put_work(struct work_struct *work); +int smc_close_shutdown_write(struct smc_sock *smc); + +#endif /* SMC_CLOSE_H */ diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c index e5c6395..8b1d343 100644 --- a/net/smc/smc_core.c +++ b/net/smc/smc_core.c @@ -23,6 +23,7 @@ #include "smc_wr.h" #include "smc_llc.h" #include "smc_cdc.h" +#include "smc_close.h" #define SMC_LGR_NUM_INCR 256 #define SMC_LGR_FREE_DELAY (600 * HZ) @@ -295,6 +296,7 @@ void smc_lgr_free(struct smc_link_group *lgr) void smc_lgr_terminate(struct smc_link_group *lgr) { struct smc_connection *conn; + struct smc_sock *smc; struct rb_node *node; spin_lock_bh(&smc_lgr_list.lock); @@ -311,11 +313,14 @@ void smc_lgr_terminate(struct smc_link_group *lgr) node = rb_first(&lgr->conns_all); while (node) { conn = rb_entry(node, struct smc_connection, alert_node); + smc = container_of(conn, struct smc_sock, conn); + sock_hold(&smc->sk); __smc_lgr_unregister_conn(conn); + smc_close_active_abort(smc); + sock_put(&smc->sk); node = rb_first(&lgr->conns_all); } write_unlock_bh(&lgr->conns_lock); - schedule_delayed_work(&lgr->free_work, SMC_LGR_FREE_DELAY); } /* Determine vlan of internal TCP socket. diff --git a/net/smc/smc_tx.c b/net/smc/smc_tx.c index 7e8799f..6e73b28 100644 --- a/net/smc/smc_tx.c +++ b/net/smc/smc_tx.c @@ -139,6 +139,7 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len) if (sk->sk_state == SMC_INIT) return -ENOTCONN; if (smc->sk.sk_shutdown & SEND_SHUTDOWN || + (smc->sk.sk_err == ECONNABORTED) || conn->local_tx_ctrl.conn_state_flags.peer_conn_abort) return -EPIPE; if (smc_cdc_rxed_any_close(conn)) @@ -392,6 +393,13 @@ int smc_tx_sndbuf_nonempty(struct smc_connection *conn) &pend); if (rc < 0) { if (rc == -EBUSY) { + struct smc_sock *smc = + container_of(conn, struct smc_sock, conn); + + if (smc->sk.sk_err == ECONNABORTED) { + rc = sock_error(&smc->sk); + goto out_unlock; + } rc = 0; schedule_work(&conn->tx_work); } diff --git a/net/smc/smc_wr.c b/net/smc/smc_wr.c index 14f3f3f..eadf157 100644 --- a/net/smc/smc_wr.c +++ b/net/smc/smc_wr.c @@ -81,6 +81,8 @@ static inline void smc_wr_tx_process_cqe(struct ib_wc *wc) if (!test_and_clear_bit(pnd_snd_idx, link->wr_tx_mask)) return; if (wc->status) { + struct smc_link_group *lgr; + for_each_set_bit(i, link->wr_tx_mask, link->wr_tx_cnt) { /* clear full struct smc_wr_tx_pend including .priv */ memset(&link->wr_tx_pends[i], 0, @@ -89,9 +91,10 @@ static inline void smc_wr_tx_process_cqe(struct ib_wc *wc) sizeof(link->wr_tx_bufs[i])); clear_bit(i, link->wr_tx_mask); } - /* tbd in future patch: terminate connections of this link - * group abnormally - */ + /* terminate connections of this link group abnormally */ + lgr = container_of(link, struct smc_link_group, + lnk[SMC_SINGLE_LINK]); + smc_lgr_terminate(lgr); } if (pnd_snd.handler) pnd_snd.handler(&pnd_snd.priv, link, wc->status); @@ -176,9 +179,12 @@ int smc_wr_tx_get_free_slot(struct smc_link *link, (smc_wr_tx_get_free_slot_index(link, &idx) != -EBUSY), SMC_WR_TX_WAIT_FREE_SLOT_TIME); if (!rc) { - /* tbd in future patch: timeout - terminate connections - * of this link group abnormally - */ + /* timeout - terminate connections */ + struct smc_link_group *lgr; + + lgr = container_of(link, struct smc_link_group, + lnk[SMC_SINGLE_LINK]); + smc_lgr_terminate(lgr); return -EPIPE; } if (rc == -ERESTARTSYS) @@ -256,6 +262,24 @@ void smc_wr_tx_dismiss_slots(struct smc_link *link, u8 wr_rx_hdr_type, } } +bool smc_wr_tx_has_pending(struct smc_link *link, u8 wr_rx_hdr_type, + smc_wr_tx_filter filter, unsigned long data) +{ + struct smc_wr_tx_pend_priv *tx_pend; + struct smc_wr_rx_hdr *wr_rx; + int i; + + for_each_set_bit(i, link->wr_tx_mask, link->wr_tx_cnt) { + wr_rx = (struct smc_wr_rx_hdr *)&link->wr_rx_bufs[i]; + if (wr_rx->type != wr_rx_hdr_type) + continue; + tx_pend = &link->wr_tx_pends[i].priv; + if (filter(tx_pend, data)) + return true; + } + return false; +} + /****************************** receive queue ********************************/ int smc_wr_rx_register_handler(struct smc_wr_rx_handler *handler) @@ -310,14 +334,19 @@ static inline void smc_wr_rx_process_cqes(struct ib_wc wc[], int num) smc_wr_rx_demultiplex(&wc[i]); smc_wr_rx_post(link); /* refill WR RX */ } else { + struct smc_link_group *lgr; + /* handle status errors */ switch (wc[i].status) { case IB_WC_RETRY_EXC_ERR: case IB_WC_RNR_RETRY_EXC_ERR: case IB_WC_WR_FLUSH_ERR: - /* tbd in future patch: terminate connections of this - * link group abnormally - */ + /* terminate connections of this link group + * abnormally + */ + lgr = container_of(link, struct smc_link_group, + lnk[SMC_SINGLE_LINK]); + smc_lgr_terminate(lgr); break; default: smc_wr_rx_post(link); /* refill WR RX */ diff --git a/net/smc/smc_wr.h b/net/smc/smc_wr.h index 124f857..0b9beed 100644 --- a/net/smc/smc_wr.h +++ b/net/smc/smc_wr.h @@ -92,6 +92,8 @@ int smc_wr_tx_put_slot(struct smc_link *link, int smc_wr_tx_send(struct smc_link *link, struct smc_wr_tx_pend_priv *wr_pend_priv); void smc_wr_tx_cq_handler(struct ib_cq *ib_cq, void *cq_context); +bool smc_wr_tx_has_pending(struct smc_link *link, u8 wr_rx_hdr_type, + smc_wr_tx_filter filter, unsigned long data); void smc_wr_tx_dismiss_slots(struct smc_link *lnk, u8 wr_rx_hdr_type, smc_wr_tx_filter filter, smc_wr_tx_dismisser dismisser, |
