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tcp: add tcp_sock_set_keepcnt 

Add a helper to directly set the TCP_KEEPCNT sockopt from kernel space
without going through a fake uaccess.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig 2020-05-28 07:12:25 +02:00 committed by David S. Miller
parent d41ecaac90
commit 480aeb9639
5 changed files with 18 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/tcp.h
View File

@ -498,6 +498,7 @@ int tcp_skb_shift(struct sk_buff *to, struct sk_buff *from, int pcount,
int shiftlen);
void tcp_sock_set_cork(struct sock *sk, bool on);
int tcp_sock_set_keepcnt(struct sock *sk, int val);
int tcp_sock_set_keepidle(struct sock *sk, int val);
int tcp_sock_set_keepintvl(struct sock *sk, int val);
void tcp_sock_set_nodelay(struct sock *sk);

12
net/ipv4/tcp.c
View File

@ -2946,6 +2946,18 @@ int tcp_sock_set_keepintvl(struct sock *sk, int val)
}
EXPORT_SYMBOL(tcp_sock_set_keepintvl);
int tcp_sock_set_keepcnt(struct sock *sk, int val)
{
if (val < 1 || val > MAX_TCP_KEEPCNT)
return -EINVAL;
lock_sock(sk);
tcp_sk(sk)->keepalive_probes = val;
release_sock(sk);
return 0;
}
EXPORT_SYMBOL(tcp_sock_set_keepcnt);
/*
* Socket option code for TCP.
*/

2
net/rds/tcp.h
View File

@ -70,7 +70,7 @@ struct socket *rds_tcp_listen_init(struct net *net, bool isv6);
void rds_tcp_listen_stop(struct socket *sock, struct work_struct *acceptor);
void rds_tcp_listen_data_ready(struct sock *sk);
int rds_tcp_accept_one(struct socket *sock);
int rds_tcp_keepalive(struct socket *sock);
void rds_tcp_keepalive(struct socket *sock);
void *rds_tcp_listen_sock_def_readable(struct net *net);
/* tcp_recv.c */

17
net/rds/tcp_listen.c
View File

@ -38,27 +38,19 @@
#include "rds.h"
#include "tcp.h"
int rds_tcp_keepalive(struct socket *sock)
void rds_tcp_keepalive(struct socket *sock)
{
/* values below based on xs_udp_default_timeout */
int keepidle = 5; /* send a probe 'keepidle' secs after last data */
int keepcnt = 5; /* number of unack'ed probes before declaring dead */
int ret = 0;
sock_set_keepalive(sock->sk);
ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_KEEPCNT,
(char *)&keepcnt, sizeof(keepcnt));
if (ret < 0)
goto bail;
tcp_sock_set_keepcnt(sock->sk, keepcnt);
tcp_sock_set_keepidle(sock->sk, keepidle);
/* KEEPINTVL is the interval between successive probes. We follow
* the model in xs_tcp_finish_connecting() and re-use keepidle.
*/
tcp_sock_set_keepintvl(sock->sk, keepidle);
bail:
return ret;
}
/* rds_tcp_accept_one_path(): if accepting on cp_index > 0, make sure the
@ -140,10 +132,7 @@ int rds_tcp_accept_one(struct socket *sock)
new_sock->ops = sock->ops;
__module_get(new_sock->ops->owner);
ret = rds_tcp_keepalive(new_sock);
if (ret < 0)
goto out;
rds_tcp_keepalive(new_sock);
rds_tcp_tune(new_sock);
inet = inet_sk(new_sock->sk);

3
net/sunrpc/xprtsock.c
View File

@ -2109,8 +2109,7 @@ static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
sock_set_keepalive(sock->sk);
tcp_sock_set_keepidle(sock->sk, keepidle);
tcp_sock_set_keepintvl(sock->sk, keepidle);
kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
(char *)&keepcnt, sizeof(keepcnt));
tcp_sock_set_keepcnt(sock->sk, keepcnt);
/* TCP user timeout (see RFC5482) */
tcp_sock_set_user_timeout(sock->sk, timeo);