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mptcp: add net.mptcp.available_schedulers

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The sysctl lists the available schedulers that can be set using
net.mptcp.scheduler similarly to net.ipv4.tcp_available_congestion_control.

Signed-off-by: Gregory Detal <gregory.detal@gmail.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Tested-by: Geliang Tang <geliang@kernel.org>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Mat Martineau <martineau@kernel.org>
Link: https://lore.kernel.org/r/20240514011335.176158-5-martineau@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Gregory Detal 2024-05-13 18:13:28 -07:00 committed by Jakub Kicinski
parent ce5f6f71b0
commit 73c900aa36
4 changed files with 52 additions and 1 deletions
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3
include/net/mptcp.h
View File

@ -97,6 +97,9 @@ struct mptcp_out_options {
};
#define MPTCP_SCHED_NAME_MAX 16
#define MPTCP_SCHED_MAX 128
#define MPTCP_SCHED_BUF_MAX (MPTCP_SCHED_NAME_MAX * MPTCP_SCHED_MAX)
#define MPTCP_SUBFLOWS_MAX 8
struct mptcp_sched_data {

27
net/mptcp/ctrl.c
View File

@ -133,6 +133,24 @@ static int proc_scheduler(struct ctl_table *ctl, int write,
return ret;
}
static int proc_available_schedulers(struct ctl_table *ctl,
int write, void *buffer,
size_t *lenp, loff_t *ppos)
{
struct ctl_table tbl = { .maxlen = MPTCP_SCHED_BUF_MAX, };
int ret;
tbl.data = kmalloc(tbl.maxlen, GFP_USER);
if (!tbl.data)
return -ENOMEM;
mptcp_get_available_schedulers(tbl.data, MPTCP_SCHED_BUF_MAX);
ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
kfree(tbl.data);
return ret;
}
static struct ctl_table mptcp_sysctl_table[] = {
{
.procname = "enabled",
@ -187,6 +205,12 @@ static struct ctl_table mptcp_sysctl_table[] = {
.mode = 0644,
.proc_handler = proc_scheduler,
},
{
.procname = "available_schedulers",
.maxlen = MPTCP_SCHED_BUF_MAX,
.mode = 0644,
.proc_handler = proc_available_schedulers,
},
{
.procname = "close_timeout",
.maxlen = sizeof(unsigned int),
@ -214,7 +238,8 @@ static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
table[4].data = &pernet->stale_loss_cnt;
table[5].data = &pernet->pm_type;
table[6].data = &pernet->scheduler;
table[7].data = &pernet->close_timeout;
/* table[7] is for available_schedulers which is read-only info */
table[8].data = &pernet->close_timeout;
hdr = register_net_sysctl_sz(net, MPTCP_SYSCTL_PATH, table,
ARRAY_SIZE(mptcp_sysctl_table));

1
net/mptcp/protocol.h
View File

@ -686,6 +686,7 @@ unsigned int mptcp_stale_loss_cnt(const struct net *net);
unsigned int mptcp_close_timeout(const struct sock *sk);
int mptcp_get_pm_type(const struct net *net);
const char *mptcp_get_scheduler(const struct net *net);
void mptcp_get_available_schedulers(char *buf, size_t maxlen);
void __mptcp_subflow_fully_established(struct mptcp_sock *msk,
struct mptcp_subflow_context *subflow,
const struct mptcp_options_received *mp_opt);

22
net/mptcp/sched.c
View File

@ -51,6 +51,28 @@ struct mptcp_sched_ops *mptcp_sched_find(const char *name)
return ret;
}
/* Build string with list of available scheduler values.
* Similar to tcp_get_available_congestion_control()
*/
void mptcp_get_available_schedulers(char *buf, size_t maxlen)
{
struct mptcp_sched_ops *sched;
size_t offs = 0;
rcu_read_lock();
spin_lock(&mptcp_sched_list_lock);
list_for_each_entry_rcu(sched, &mptcp_sched_list, list) {
offs += snprintf(buf + offs, maxlen - offs,
"%s%s",
offs == 0 ? "" : " ", sched->name);
if (WARN_ON_ONCE(offs >= maxlen))
break;
}
spin_unlock(&mptcp_sched_list_lock);
rcu_read_unlock();
}
int mptcp_register_scheduler(struct mptcp_sched_ops *sched)
{
if (!sched->get_subflow)