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mptcp: add sched in mptcp_sock 

This patch adds a new struct member sched in struct mptcp_sock.
And two helpers mptcp_init_sched() and mptcp_release_sched() to
init and release it.

Init it with the sysctl scheduler in mptcp_init_sock(), copy the
scheduler from the parent in mptcp_sk_clone(), and release it in
__mptcp_destroy_sock().

Acked-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Mat Martineau <martineau@kernel.org>
Link: https://lore.kernel.org/r/20230821-upstream-net-next-20230818-v1-5-0c860fb256a8@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Geliang Tang 2023-08-21 15:25:16 -07:00 committed by Jakub Kicinski
parent e3b2870b6d
commit 1730b2b2c5
3 changed files with 45 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
net/mptcp/protocol.c
View File

@ -2697,6 +2697,7 @@ static void mptcp_ca_reset(struct sock *sk)
static int mptcp_init_sock(struct sock *sk)
{
struct net *net = sock_net(sk);
int ret;
__mptcp_init_sock(sk);
@ -2706,6 +2707,11 @@ static int mptcp_init_sock(struct sock *sk)
if (unlikely(!net->mib.mptcp_statistics) && !mptcp_mib_alloc(net))
return -ENOMEM;
ret = mptcp_init_sched(mptcp_sk(sk),
mptcp_sched_find(mptcp_get_scheduler(net)));
if (ret)
return ret;
set_bit(SOCK_CUSTOM_SOCKOPT, &sk->sk_socket->flags);
/* fetch the ca name; do it outside __mptcp_init_sock(), so that clone will
@ -2851,6 +2857,7 @@ static void __mptcp_destroy_sock(struct sock *sk)
mptcp_stop_timer(sk);
sk_stop_timer(sk, &sk->sk_timer);
msk->pm.status = 0;
mptcp_release_sched(msk);
sk->sk_prot->destroy(sk);
@ -3105,6 +3112,7 @@ struct sock *mptcp_sk_clone_init(const struct sock *sk,
msk->snd_una = msk->write_seq;
msk->wnd_end = msk->snd_nxt + req->rsk_rcv_wnd;
msk->setsockopt_seq = mptcp_sk(sk)->setsockopt_seq;
mptcp_init_sched(msk, mptcp_sk(sk)->sched);
/* passive msk is created after the first/MPC subflow */
msk->subflow_id = 2;

4
net/mptcp/protocol.h
View File

@ -312,6 +312,7 @@ struct mptcp_sock {
* lock as such sock is freed after close().
*/
struct mptcp_pm_data pm;
struct mptcp_sched_ops *sched;
struct {
u32 space; /* bytes copied in last measurement window */
u32 copied; /* bytes copied in this measurement window */
@ -659,6 +660,9 @@ void mptcp_info2sockaddr(const struct mptcp_addr_info *info,
struct mptcp_sched_ops *mptcp_sched_find(const char *name);
int mptcp_register_scheduler(struct mptcp_sched_ops *sched);
void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched);
int mptcp_init_sched(struct mptcp_sock *msk,
struct mptcp_sched_ops *sched);
void mptcp_release_sched(struct mptcp_sock *msk);
static inline bool __tcp_can_send(const struct sock *ssk)
{

33
net/mptcp/sched.c
View File

@ -54,3 +54,36 @@ void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched)
list_del_rcu(&sched->list);
spin_unlock(&mptcp_sched_list_lock);
}
int mptcp_init_sched(struct mptcp_sock *msk,
struct mptcp_sched_ops *sched)
{
if (!sched)
goto out;
if (!bpf_try_module_get(sched, sched->owner))
return -EBUSY;
msk->sched = sched;
if (msk->sched->init)
msk->sched->init(msk);
pr_debug("sched=%s", msk->sched->name);
out:
return 0;
}
void mptcp_release_sched(struct mptcp_sock *msk)
{
struct mptcp_sched_ops *sched = msk->sched;
if (!sched)
return;
msk->sched = NULL;
if (sched->release)
sched->release(msk);
bpf_module_put(sched, sched->owner);
}