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[TCP]: Allow choosing TCP congestion control via sockopt.

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Allow using setsockopt to set TCP congestion control to use on a per
socket basis.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2005-06-23 20:37:36 -07:00 • committed by David S. Miller
parent 51b0bdedb8
commit 5f8ef48d24
6 changed files with 79 additions and 6 deletions
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46
net/ipv4/tcp_cong.c
View file

@ -21,7 +21,7 @@ static struct tcp_congestion_ops *tcp_ca_find(const char *name)
{
struct tcp_congestion_ops *e;
list_for_each_entry(e, &tcp_cong_list, list) {
list_for_each_entry_rcu(e, &tcp_cong_list, list) {
if (strcmp(e->name, name) == 0)
return e;
}
@ -77,6 +77,9 @@ void tcp_init_congestion_control(struct tcp_sock *tp)
{
struct tcp_congestion_ops *ca;
if (tp->ca_ops != &tcp_init_congestion_ops)
return;
rcu_read_lock();
list_for_each_entry_rcu(ca, &tcp_cong_list, list) {
if (try_module_get(ca->owner)) {
@ -139,6 +142,34 @@ void tcp_get_default_congestion_control(char *name)
rcu_read_unlock();
}
/* Change congestion control for socket */
int tcp_set_congestion_control(struct tcp_sock *tp, const char *name)
{
struct tcp_congestion_ops *ca;
int err = 0;
rcu_read_lock();
ca = tcp_ca_find(name);
if (ca == tp->ca_ops)
goto out;
if (!ca)
err = -ENOENT;
else if (!try_module_get(ca->owner))
err = -EBUSY;
else {
tcp_cleanup_congestion_control(tp);
tp->ca_ops = ca;
if (tp->ca_ops->init)
tp->ca_ops->init(tp);
}
out:
rcu_read_unlock();
return err;
}
/*
* TCP Reno congestion control
* This is special case used for fallback as well.
@ -192,4 +223,15 @@ struct tcp_congestion_ops tcp_reno = {
.min_cwnd = tcp_reno_min_cwnd,
};
EXPORT_SYMBOL_GPL(tcp_reno);
/* Initial congestion control used (until SYN)
* really reno under another name so we can tell difference
* during tcp_set_default_congestion_control
*/
struct tcp_congestion_ops tcp_init_congestion_ops = {
.name = "",
.owner = THIS_MODULE,
.ssthresh = tcp_reno_ssthresh,
.cong_avoid = tcp_reno_cong_avoid,
.min_cwnd = tcp_reno_min_cwnd,
};
EXPORT_SYMBOL_GPL(tcp_init_congestion_ops);