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smc: socket closing and linkgroup cleanup 

smc_shutdown() and smc_release() handling
delayed linkgroup cleanup for linkgroups without connections

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun 2017-01-09 16:55:25 +01:00 committed by David S. Miller
parent 952310ccf2
commit b38d732477
11 changed files with 668 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
net/smc/Makefile
View File

@ -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

127
net/smc/af_smc.c
View File

@ -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,

18
net/smc/smc.h
View File

@ -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 */

23
net/smc/smc_cdc.c
View File

@ -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 */

1
net/smc/smc_cdc.h
View File

@ -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 */

441
net/smc/smc_close.c Normal file
View File

@ -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;
}

28
net/smc/smc_close.h Normal file
View File

@ -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 */

7
net/smc/smc_core.c
View File

@ -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.

8
net/smc/smc_tx.c
View File

@ -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);
}

47
net/smc/smc_wr.c
View File

@ -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 */

2
net/smc/smc_wr.h
View File

@ -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,