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Message-Id: <20161124150645.90881-15-ubraun@linux.vnet.ibm.com>
Date: Thu, 24 Nov 2016 16:06:44 +0100
From: Ursula Braun <ubraun@...ux.vnet.ibm.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, linux-s390@...r.kernel.org,
schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
utz.bacher@...ibm.com, ubraun@...ux.vnet.ibm.com
Subject: [PATCH V3 net-next 14/15] 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@...ux.vnet.ibm.com>
---
net/smc/Makefile | 2 +-
net/smc/af_smc.c | 127 ++++++++++++---
net/smc/smc.h | 20 ++-
net/smc/smc_cdc.c | 33 ++--
net/smc/smc_cdc.h | 1 +
net/smc/smc_close.c | 441 ++++++++++++++++++++++++++++++++++++++++++++++++++++
net/smc/smc_close.h | 28 ++++
net/smc/smc_core.c | 7 +-
net/smc/smc_tx.c | 8 +
net/smc/smc_wr.c | 47 ++++--
net/smc/smc_wr.h | 2 +
11 files changed, 669 insertions(+), 47 deletions(-)
create mode 100644 net/smc/smc_close.c
create mode 100644 net/smc/smc_close.h
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 5959c84..23f7d65 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)
@@ -127,6 +150,7 @@ 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);
return sk;
}
@@ -427,7 +451,8 @@ 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;
@@ -569,8 +594,8 @@ 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;
@@ -591,11 +616,17 @@ 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;
@@ -603,7 +634,16 @@ 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);
}
@@ -771,11 +811,12 @@ 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 */
@@ -801,6 +842,7 @@ static void smc_listen_work(struct work_struct *work)
out_err:
newsmcsk->sk_state = SMC_CLOSED;
+ smc_conn_free(&new_smc->conn);
goto enqueue; /* queue new sock with sk_err set */
}
@@ -921,7 +963,8 @@ 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);
@@ -937,7 +980,9 @@ 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);
@@ -957,13 +1002,21 @@ 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;
@@ -1023,7 +1076,8 @@ 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);
@@ -1031,7 +1085,14 @@ 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;
@@ -1042,31 +1103,53 @@ 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 e5e47fa..963b60f 100644
--- a/net/smc/smc.h
+++ b/net/smc/smc.h
@@ -27,6 +27,16 @@ 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;
@@ -161,8 +171,14 @@ 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 */
u8 use_fallback : 1, /* fallback to tcp */
- clc_started : 1;/* smc_connect_rdma ran */
+ clc_started : 1,/* smc_connect_rdma ran */
+ 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)
@@ -248,5 +264,7 @@ 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 47d6d96..c000c23 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)
@@ -201,21 +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;
- if (smc_cdc_rxed_any_close_or_senddone(conn)) {
- smc->sk.sk_shutdown |= RCV_SHUTDOWN;
- sock_set_flag(&smc->sk, SOCK_DONE);
-
- /* subsequent patch: terminate connection */
+ conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
}
+ if (smc_cdc_rxed_any_close_or_senddone(conn))
+ 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);
-
- /* subsequent patch: trigger socket release if connection closed */
+ /* trigger socket release if connection closed */
+ smc_close_wake_tx_prepared(smc);
+ }
/* socket connected but not accepted */
if (!smc->sk.sk_socket)
@@ -244,10 +255,6 @@ static inline void smc_cdc_msg_recv(struct smc_cdc_msg *cdc,
return;
}
smc = container_of(connection, struct smc_sock, conn);
- if (smc->sk.sk_state == SMC_CLOSED) {
- read_unlock_bh(&lgr->conns_lock);
- return;
- }
sock_hold(&smc->sk);
read_unlock_bh(&lgr->conns_lock);
bh_lock_sock(&smc->sk);
diff --git a/net/smc/smc_cdc.h b/net/smc/smc_cdc.h
index 8028489..dc32c26 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@...ux.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@...ux.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 8dbe42a..bc3c141 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)
@@ -293,6 +294,7 @@ 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);
@@ -309,11 +311,14 @@ 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,
--
2.8.4
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