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net/smc: handle sockopt TCP_DEFER_ACCEPT 

If sockopt TCP_DEFER_ACCEPT is set, the accept is delayed till
data is available.

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 2018-04-26 17:18:23 +02:00 committed by David S. Miller
parent 01d2f7e2cd
commit abb190f194
4 changed files with 31 additions and 2 deletions
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26
net/smc/af_smc.c
View File

@ -1044,6 +1044,7 @@ static int smc_accept(struct socket *sock, struct socket *new_sock,
if (lsmc->sk.sk_state != SMC_LISTEN) {
rc = -EINVAL;
release_sock(sk);
goto out;
}
@ -1071,9 +1072,29 @@ static int smc_accept(struct socket *sock, struct socket *new_sock,
if (!rc)
rc = sock_error(nsk);
release_sock(sk);
if (rc)
goto out;
if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
/* wait till data arrives on the socket */
timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
MSEC_PER_SEC);
if (smc_sk(nsk)->use_fallback) {
struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
lock_sock(clcsk);
if (skb_queue_empty(&clcsk->sk_receive_queue))
sk_wait_data(clcsk, &timeo, NULL);
release_sock(clcsk);
} else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
lock_sock(nsk);
smc_rx_wait_data(smc_sk(nsk), &timeo);
release_sock(nsk);
}
}
out:
release_sock(sk);
sock_put(sk); /* sock_hold above */
return rc;
}
@ -1340,6 +1361,9 @@ static int smc_setsockopt(struct socket *sock, int level, int optname,
0);
}
break;
case TCP_DEFER_ACCEPT:
smc->sockopt_defer_accept = val;
break;
default:
break;
}

4
net/smc/smc.h
View File

@ -180,6 +180,10 @@ struct smc_sock { /* smc sock container */
struct list_head accept_q; /* sockets to be accepted */
spinlock_t accept_q_lock; /* protects accept_q */
bool use_fallback; /* fallback to tcp */
int sockopt_defer_accept;
/* sockopt TCP_DEFER_ACCEPT
* value
*/
u8 wait_close_tx_prepared : 1;
/* shutdown wr or close
* started, waiting for unsent

2
net/smc/smc_rx.c
View File

@ -51,7 +51,7 @@ static void smc_rx_data_ready(struct sock *sk)
* 1 if at least 1 byte available in rcvbuf or if socket error/shutdown.
* 0 otherwise (nothing in rcvbuf nor timeout, e.g. interrupted).
*/
static int smc_rx_wait_data(struct smc_sock *smc, long *timeo)
int smc_rx_wait_data(struct smc_sock *smc, long *timeo)
{
DEFINE_WAIT_FUNC(wait, woken_wake_function);
struct smc_connection *conn = &smc->conn;

1
net/smc/smc_rx.h
View File

@ -20,5 +20,6 @@
void smc_rx_init(struct smc_sock *smc);
int smc_rx_recvmsg(struct smc_sock *smc, struct msghdr *msg, size_t len,
int flags);
int smc_rx_wait_data(struct smc_sock *smc, long *timeo);
#endif /* SMC_RX_H */