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net/smc: sockopts TCP_NODELAY and TCP_CORK

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Setting sockopt TCP_NODELAY or resetting sockopt TCP_CORK
triggers data transfer.

For a corked SMC socket RDMA writes are deferred, if there is
still sufficient send buffer space 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 17:18:22 +02:00 committed by David S. Miller
parent ee9dfbef02
commit 01d2f7e2cd
2 changed files with 40 additions and 4 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

20
net/smc/af_smc.c
View file

@ -1291,7 +1291,7 @@ static int smc_setsockopt(struct socket *sock, int level, int optname,
{
struct sock *sk = sock->sk;
struct smc_sock *smc;
int rc;
int val, rc;
smc = smc_sk(sk);
@ -1307,6 +1307,10 @@ static int smc_setsockopt(struct socket *sock, int level, int optname,
if (rc)
return rc;
if (optlen < sizeof(int))
return rc;
get_user(val, (int __user *)optval);
lock_sock(sk);
switch (optname) {
case TCP_ULP:
@ -1322,6 +1326,20 @@ static int smc_setsockopt(struct socket *sock, int level, int optname,
rc = -EINVAL;
}
break;
case TCP_NODELAY:
if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) {
if (val)
mod_delayed_work(system_wq, &smc->conn.tx_work,
0);
}
break;
case TCP_CORK:
if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) {
if (!val)
mod_delayed_work(system_wq, &smc->conn.tx_work,
0);
}
break;
default:
break;
}

24
net/smc/smc_tx.c
View file

@ -19,6 +19,7 @@
#include <linux/sched/signal.h>
#include <net/sock.h>
#include <net/tcp.h>
#include "smc.h"
#include "smc_wr.h"
@ -26,6 +27,7 @@
#include "smc_tx.h"
#define SMC_TX_WORK_DELAY HZ
#define SMC_TX_CORK_DELAY (HZ >> 2) /* 250 ms */
/***************************** sndbuf producer *******************************/
@ -115,6 +117,13 @@ static int smc_tx_wait_memory(struct smc_sock *smc, int flags)
return rc;
}
static bool smc_tx_is_corked(struct smc_sock *smc)
{
struct tcp_sock *tp = tcp_sk(smc->clcsock->sk);
return (tp->nonagle & TCP_NAGLE_CORK) ? true : false;
}
/* sndbuf producer: main API called by socket layer.
* called under sock lock.
*/
@ -209,7 +218,16 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len)
/* since we just produced more new data into sndbuf,
* trigger sndbuf consumer: RDMA write into peer RMBE and CDC
*/
smc_tx_sndbuf_nonempty(conn);
if ((msg->msg_flags & MSG_MORE || smc_tx_is_corked(smc)) &&
(atomic_read(&conn->sndbuf_space) >
(conn->sndbuf_size >> 1)))
/* for a corked socket defer the RDMA writes if there
* is still sufficient sndbuf_space available
*/
schedule_delayed_work(&conn->tx_work,
SMC_TX_CORK_DELAY);
else
smc_tx_sndbuf_nonempty(conn);
} /* while (msg_data_left(msg)) */
return send_done;
@ -409,8 +427,8 @@ int smc_tx_sndbuf_nonempty(struct smc_connection *conn)
}
rc = 0;
if (conn->alert_token_local) /* connection healthy */
schedule_delayed_work(&conn->tx_work,
SMC_TX_WORK_DELAY);
mod_delayed_work(system_wq, &conn->tx_work,
SMC_TX_WORK_DELAY);
}
goto out_unlock;
}