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mptcp: do not block subflows creation on errors

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If the MPTCP configuration allows for multiple subflows
creation, and the first additional subflows never reach
the fully established status - e.g. due to packets drop or
reset - the in kernel path manager do not move to the
next subflow.

This patch introduces a new PM helper to cope with MPJ
subflow creation failure and delay and hook it where appropriate.

Such helper triggers additional subflow creation, as needed
and updates the PM subflow counter, if the current one is
closing.

Additionally start all the needed additional subflows
as soon as the MPTCP socket is fully established, so we don't
have to cope with slow MPJ handshake blocking the next subflow
creation.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2022-01-06 16:20:23 -08:00 • committed by David S. Miller
parent 86e39e0448
commit a88c9e4969
4 changed files with 72 additions and 32 deletions
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23
net/mptcp/pm.c
View file

@ -172,9 +172,28 @@ void mptcp_pm_subflow_established(struct mptcp_sock *msk)
spin_unlock_bh(&pm->lock);
}
void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id)
void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, const struct sock *ssk,
const struct mptcp_subflow_context *subflow)
{
pr_debug("msk=%p", msk);
struct mptcp_pm_data *pm = &msk->pm;
bool update_subflows;
update_subflows = (ssk->sk_state == TCP_CLOSE) &&
(subflow->request_join || subflow->mp_join);
if (!READ_ONCE(pm->work_pending) && !update_subflows)
return;
spin_lock_bh(&pm->lock);
if (update_subflows)
pm->subflows--;
/* Even if this subflow is not really established, tell the PM to try
* to pick the next ones, if possible.
*/
if (mptcp_pm_nl_check_work_pending(msk))
mptcp_pm_schedule_work(msk, MPTCP_PM_SUBFLOW_ESTABLISHED);
spin_unlock_bh(&pm->lock);
}
void mptcp_pm_add_addr_received(struct mptcp_sock *msk,