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[TCP]: Add tcp_available_congestion_control sysctl.

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Create /proc/sys/net/ipv4/tcp_available_congestion_control
that reflects currently available TCP choices.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2006-11-09 16:32:06 -08:00 committed by David S. Miller
parent b68dbcab1d
commit 3ff825b28d
5 changed files with 51 additions and 0 deletions
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6
Documentation/networking/ip-sysctl.txt
View File

@ -351,10 +351,16 @@ tcp_frto - BOOLEAN
where packet loss is typically due to random radio interference
rather than intermediate router congestion.
tcp_available_congestion_control - STRING
Shows the available congestion control choices that are registered.
More congestion control algorithms may be available as modules,
but not loaded.
tcp_congestion_control - STRING
Set the congestion control algorithm to be used for new
connections. The algorithm "reno" is always available, but
additional choices may be available based on kernel configuration.
Default is set as part of kernel configuration.
somaxconn - INTEGER
Limit of socket listen() backlog, known in userspace as SOMAXCONN.

1
include/linux/sysctl.h
View File

@ -426,6 +426,7 @@ enum
NET_CIPSOV4_CACHE_BUCKET_SIZE=119,
NET_CIPSOV4_RBM_OPTFMT=120,
NET_CIPSOV4_RBM_STRICTVALID=121,
NET_TCP_AVAIL_CONG_CONTROL=122,
};
enum {

4
include/net/tcp.h
View File

@ -620,6 +620,9 @@ enum tcp_ca_event {
* Interface for adding new TCP congestion control handlers
*/
#define TCP_CA_NAME_MAX 16
#define TCP_CA_MAX 128
#define TCP_CA_BUF_MAX (TCP_CA_NAME_MAX*TCP_CA_MAX)
struct tcp_congestion_ops {
struct list_head list;
@ -659,6 +662,7 @@ extern void tcp_init_congestion_control(struct sock *sk);
extern void tcp_cleanup_congestion_control(struct sock *sk);
extern int tcp_set_default_congestion_control(const char *name);
extern void tcp_get_default_congestion_control(char *name);
extern void tcp_get_available_congestion_control(char *buf, size_t len);
extern int tcp_set_congestion_control(struct sock *sk, const char *name);
extern void tcp_slow_start(struct tcp_sock *tp);

24
net/ipv4/sysctl_net_ipv4.c
View File

@ -129,6 +129,23 @@ static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
return ret;
}
static int proc_tcp_available_congestion_control(ctl_table *ctl,
int write, struct file * filp,
void __user *buffer, size_t *lenp,
loff_t *ppos)
{
ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
int ret;
tbl.data = kmalloc(tbl.maxlen, GFP_USER);
if (!tbl.data)
return -ENOMEM;
tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
kfree(tbl.data);
return ret;
}
ctl_table ipv4_table[] = {
{
.ctl_name = NET_IPV4_TCP_TIMESTAMPS,
@ -731,6 +748,13 @@ ctl_table ipv4_table[] = {
.proc_handler = &proc_dointvec,
},
#endif /* CONFIG_NETLABEL */
{
.ctl_name = NET_TCP_AVAIL_CONG_CONTROL,
.procname = "tcp_available_congestion_control",
.maxlen = TCP_CA_BUF_MAX,
.mode = 0444,
.proc_handler = &proc_tcp_available_congestion_control,
},
{ .ctl_name = 0 }
};

16
net/ipv4/tcp_cong.c
View File

@ -139,6 +139,22 @@ static int __init tcp_congestion_default(void)
late_initcall(tcp_congestion_default);
/* Build string with list of available congestion control values */
void tcp_get_available_congestion_control(char *buf, size_t maxlen)
{
struct tcp_congestion_ops *ca;
size_t offs = 0;
rcu_read_lock();
list_for_each_entry_rcu(ca, &tcp_cong_list, list) {
offs += snprintf(buf + offs, maxlen - offs,
"%s%s",
offs == 0 ? "" : " ", ca->name);
}
rcu_read_unlock();
}
/* Get current default congestion control */
void tcp_get_default_congestion_control(char *name)
{