diff options
| author | Matthieu Baerts (NGI0) <matttbe@kernel.org> | 2024-08-12 17:30:53 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-08-14 13:59:03 +0200 |
| commit | 9a4a4c0b8eebf57c3e6d37121198d5366d076f57 (patch) | |
| tree | dd98c899cb50edc5d34d70be5a0d2893391c85e2 | |
| parent | 432535f52e7ce4b7c63f749570825fb851cf7537 (diff) | |
| download | linux-9a4a4c0b8eebf57c3e6d37121198d5366d076f57.tar.gz linux-9a4a4c0b8eebf57c3e6d37121198d5366d076f57.tar.bz2 linux-9a4a4c0b8eebf57c3e6d37121198d5366d076f57.zip | |
mptcp: pm: don't try to create sf if alloc failed
commit cd7c957f936f8cb80d03e5152f4013aae65bd986 upstream.
It sounds better to avoid wasting cycles and / or put extreme memory
pressure on the system by trying to create new subflows if it was not
possible to add a new item in the announce list.
While at it, a warning is now printed if the entry was already in the
list as it should not happen with the in-kernel path-manager. With this
PM, mptcp_pm_alloc_anno_list() should only fail in case of memory
pressure.
Fixes: b6c08380860b ("mptcp: remove addr and subflow in PM netlink")
Cc: stable@vger.kernel.org
Suggested-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20240731-upstream-net-20240731-mptcp-endp-subflow-signal-v1-4-c8a9b036493b@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/mptcp/pm_netlink.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c index 6d5c75a40bc6..83210485cde8 100644 --- a/net/mptcp/pm_netlink.c +++ b/net/mptcp/pm_netlink.c @@ -353,7 +353,7 @@ bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, add_entry = mptcp_lookup_anno_list_by_saddr(msk, addr); if (add_entry) { - if (mptcp_pm_is_kernel(msk)) + if (WARN_ON_ONCE(mptcp_pm_is_kernel(msk))) return false; sk_reset_timer(sk, &add_entry->add_timer, @@ -563,8 +563,6 @@ static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk) /* check first for announce */ if (msk->pm.add_addr_signaled < add_addr_signal_max) { - local = select_signal_address(pernet, msk); - /* due to racing events on both ends we can reach here while * previous add address is still running: if we invoke now * mptcp_pm_announce_addr(), that will fail and the @@ -575,11 +573,15 @@ static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk) if (msk->pm.addr_signal & BIT(MPTCP_ADD_ADDR_SIGNAL)) return; + local = select_signal_address(pernet, msk); if (!local) goto subflow; + /* If the alloc fails, we are on memory pressure, not worth + * continuing, and trying to create subflows. + */ if (!mptcp_pm_alloc_anno_list(msk, &local->addr)) - goto subflow; + return; __clear_bit(local->addr.id, msk->pm.id_avail_bitmap); msk->pm.add_addr_signaled++; |