forked from luck/tmp_suning_uos_patched
net/smc: nonblocking connect rework
For nonblocking sockets move the kernel_connect() from the connect worker into the initial smc_connect part to return kernel_connect() errors other than -EINPROGRESS to user space. Reviewed-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun
David S. Miller
parent
6dc400af21
commit
50717a37db
|
|
@ -134,11 +134,9 @@ static int smc_release(struct socket *sock)
|
|||
smc = smc_sk(sk);
|
||||
|
||||
/* cleanup for a dangling non-blocking connect */
|
||||
if (smc->connect_info && sk->sk_state == SMC_INIT)
|
||||
if (smc->connect_nonblock && sk->sk_state == SMC_INIT)
|
||||
tcp_abort(smc->clcsock->sk, ECONNABORTED);
|
||||
flush_work(&smc->connect_work);
|
||||
kfree(smc->connect_info);
|
||||
smc->connect_info = NULL;
|
||||
|
||||
if (sk->sk_state == SMC_LISTEN)
|
||||
/* smc_close_non_accepted() is called and acquires
|
||||
|
|
@ -452,6 +450,7 @@ static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
|
|||
smc->use_fallback = true;
|
||||
smc->fallback_rsn = reason_code;
|
||||
smc_copy_sock_settings_to_clc(smc);
|
||||
smc->connect_nonblock = 0;
|
||||
if (smc->sk.sk_state == SMC_INIT)
|
||||
smc->sk.sk_state = SMC_ACTIVE;
|
||||
return 0;
|
||||
|
|
@ -491,6 +490,7 @@ static int smc_connect_abort(struct smc_sock *smc, int reason_code,
|
|||
mutex_unlock(&smc_client_lgr_pending);
|
||||
|
||||
smc_conn_free(&smc->conn);
|
||||
smc->connect_nonblock = 0;
|
||||
return reason_code;
|
||||
}
|
||||
|
||||
|
|
@ -633,6 +633,7 @@ static int smc_connect_rdma(struct smc_sock *smc,
|
|||
mutex_unlock(&smc_client_lgr_pending);
|
||||
|
||||
smc_copy_sock_settings_to_clc(smc);
|
||||
smc->connect_nonblock = 0;
|
||||
if (smc->sk.sk_state == SMC_INIT)
|
||||
smc->sk.sk_state = SMC_ACTIVE;
|
||||
|
||||
|
|
@ -671,6 +672,7 @@ static int smc_connect_ism(struct smc_sock *smc,
|
|||
mutex_unlock(&smc_server_lgr_pending);
|
||||
|
||||
smc_copy_sock_settings_to_clc(smc);
|
||||
smc->connect_nonblock = 0;
|
||||
if (smc->sk.sk_state == SMC_INIT)
|
||||
smc->sk.sk_state = SMC_ACTIVE;
|
||||
|
||||
|
|
@ -756,17 +758,30 @@ static void smc_connect_work(struct work_struct *work)
|
|||
{
|
||||
struct smc_sock *smc = container_of(work, struct smc_sock,
|
||||
connect_work);
|
||||
int rc;
|
||||
long timeo = smc->sk.sk_sndtimeo;
|
||||
int rc = 0;
|
||||
|
||||
lock_sock(&smc->sk);
|
||||
rc = kernel_connect(smc->clcsock, &smc->connect_info->addr,
|
||||
smc->connect_info->alen, smc->connect_info->flags);
|
||||
if (!timeo)
|
||||
timeo = MAX_SCHEDULE_TIMEOUT;
|
||||
lock_sock(smc->clcsock->sk);
|
||||
if (smc->clcsock->sk->sk_err) {
|
||||
smc->sk.sk_err = smc->clcsock->sk->sk_err;
|
||||
goto out;
|
||||
} else if ((1 << smc->clcsock->sk->sk_state) &
|
||||
(TCPF_SYN_SENT | TCP_SYN_RECV)) {
|
||||
rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
|
||||
if ((rc == -EPIPE) &&
|
||||
((1 << smc->clcsock->sk->sk_state) &
|
||||
(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
|
||||
rc = 0;
|
||||
}
|
||||
if (rc < 0) {
|
||||
smc->sk.sk_err = -rc;
|
||||
release_sock(smc->clcsock->sk);
|
||||
lock_sock(&smc->sk);
|
||||
if (rc != 0 || smc->sk.sk_err) {
|
||||
smc->sk.sk_state = SMC_CLOSED;
|
||||
if (rc == -EPIPE || rc == -EAGAIN)
|
||||
smc->sk.sk_err = EPIPE;
|
||||
else if (signal_pending(current))
|
||||
smc->sk.sk_err = -sock_intr_errno(timeo);
|
||||
goto out;
|
||||
}
|
||||
|
||||
|
|
@ -779,8 +794,6 @@ static void smc_connect_work(struct work_struct *work)
|
|||
smc->sk.sk_state_change(&smc->sk);
|
||||
else
|
||||
smc->sk.sk_write_space(&smc->sk);
|
||||
kfree(smc->connect_info);
|
||||
smc->connect_info = NULL;
|
||||
release_sock(&smc->sk);
|
||||
}
|
||||
|
||||
|
|
@ -813,26 +826,18 @@ static int smc_connect(struct socket *sock, struct sockaddr *addr,
|
|||
|
||||
smc_copy_sock_settings_to_clc(smc);
|
||||
tcp_sk(smc->clcsock->sk)->syn_smc = 1;
|
||||
if (flags & O_NONBLOCK) {
|
||||
if (smc->connect_info) {
|
||||
if (smc->connect_nonblock) {
|
||||
rc = -EALREADY;
|
||||
goto out;
|
||||
}
|
||||
smc->connect_info = kzalloc(alen + 2 * sizeof(int), GFP_KERNEL);
|
||||
if (!smc->connect_info) {
|
||||
rc = -ENOMEM;
|
||||
rc = kernel_connect(smc->clcsock, addr, alen, flags);
|
||||
if (rc && rc != -EINPROGRESS)
|
||||
goto out;
|
||||
}
|
||||
smc->connect_info->alen = alen;
|
||||
smc->connect_info->flags = flags ^ O_NONBLOCK;
|
||||
memcpy(&smc->connect_info->addr, addr, alen);
|
||||
schedule_work(&smc->connect_work);
|
||||
if (flags & O_NONBLOCK) {
|
||||
if (schedule_work(&smc->connect_work))
|
||||
smc->connect_nonblock = 1;
|
||||
rc = -EINPROGRESS;
|
||||
} else {
|
||||
rc = kernel_connect(smc->clcsock, addr, alen, flags);
|
||||
if (rc)
|
||||
goto out;
|
||||
|
||||
rc = __smc_connect(smc);
|
||||
if (rc < 0)
|
||||
goto out;
|
||||
|
|
@ -1571,8 +1576,8 @@ static __poll_t smc_poll(struct file *file, struct socket *sock,
|
|||
poll_table *wait)
|
||||
{
|
||||
struct sock *sk = sock->sk;
|
||||
__poll_t mask = 0;
|
||||
struct smc_sock *smc;
|
||||
__poll_t mask = 0;
|
||||
|
||||
if (!sk)
|
||||
return EPOLLNVAL;
|
||||
|
|
@ -1582,8 +1587,6 @@ static __poll_t smc_poll(struct file *file, struct socket *sock,
|
|||
/* delegate to CLC child sock */
|
||||
mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
|
||||
sk->sk_err = smc->clcsock->sk->sk_err;
|
||||
if (sk->sk_err)
|
||||
mask |= EPOLLERR;
|
||||
} else {
|
||||
if (sk->sk_state != SMC_CLOSED)
|
||||
sock_poll_wait(file, sock, wait);
|
||||
|
|
@ -1594,9 +1597,14 @@ static __poll_t smc_poll(struct file *file, struct socket *sock,
|
|||
mask |= EPOLLHUP;
|
||||
if (sk->sk_state == SMC_LISTEN) {
|
||||
/* woken up by sk_data_ready in smc_listen_work() */
|
||||
mask = smc_accept_poll(sk);
|
||||
mask |= smc_accept_poll(sk);
|
||||
} else if (smc->use_fallback) { /* as result of connect_work()*/
|
||||
mask |= smc->clcsock->ops->poll(file, smc->clcsock,
|
||||
wait);
|
||||
sk->sk_err = smc->clcsock->sk->sk_err;
|
||||
} else {
|
||||
if (atomic_read(&smc->conn.sndbuf_space) ||
|
||||
if ((sk->sk_state != SMC_INIT &&
|
||||
atomic_read(&smc->conn.sndbuf_space)) ||
|
||||
sk->sk_shutdown & SEND_SHUTDOWN) {
|
||||
mask |= EPOLLOUT | EPOLLWRNORM;
|
||||
} else {
|
||||
|
|
|
|||
|
|
@ -190,18 +190,11 @@ struct smc_connection {
|
|||
u64 peer_token; /* SMC-D token of peer */
|
||||
};
|
||||
|
||||
struct smc_connect_info {
|
||||
int flags;
|
||||
int alen;
|
||||
struct sockaddr addr;
|
||||
};
|
||||
|
||||
struct smc_sock { /* smc sock container */
|
||||
struct sock sk;
|
||||
struct socket *clcsock; /* internal tcp socket */
|
||||
struct smc_connection conn; /* smc connection */
|
||||
struct smc_sock *listen_smc; /* listen parent */
|
||||
struct smc_connect_info *connect_info; /* connect address & flags */
|
||||
struct work_struct connect_work; /* handle non-blocking connect*/
|
||||
struct work_struct tcp_listen_work;/* handle tcp socket accepts */
|
||||
struct work_struct smc_listen_work;/* prepare new accept socket */
|
||||
|
|
@ -219,6 +212,10 @@ struct smc_sock { /* smc sock container */
|
|||
* started, waiting for unsent
|
||||
* data to be sent
|
||||
*/
|
||||
u8 connect_nonblock : 1;
|
||||
/* non-blocking connect in
|
||||
* flight
|
||||
*/
|
||||
struct mutex clcsock_release_lock;
|
||||
/* protects clcsock of a listen
|
||||
* socket
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user