diff options
| author | Paolo Abeni <pabeni@redhat.com> | 2023-08-11 18:57:26 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-08-14 09:06:14 +0300 |
| commit | 39880bd808ad2ddfb9b7fee129568c3b814f0609 (patch) | |
| tree | e339a4f8ccbea0530ebe7ae3a9b7bee5f8ca87c3 /net/mptcp/protocol.h | |
| parent | 3f326a821b99812edb6d3c24bcb78377cae6e432 (diff) | |
| download | linux-39880bd808ad2ddfb9b7fee129568c3b814f0609.tar.xz | |
mptcp: get rid of msk->subflow
Such field is now unused just as a flag to control the first subflow
deletion at close() time. Introduce a new bit flag for that and finally
drop the mentioned field.
As an intended side effect, now the first subflow sock is not freed
before close() even for passive sockets. The msk has no open/active
subflows if the first one is closed and the subflow list is singular,
update accordingly the state check in mptcp_stream_accept().
Among other benefits, the subflow removal, reduces the amount of memory
used on the client side for each mptcp connection, allows passive sockets
to go through successful accept()/disconnect()/connect() and makes return
error code consistent for failing both passive and active sockets.
Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/290
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mptcp/protocol.h')
| -rw-r--r-- | net/mptcp/protocol.h | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index dccc96dc2d6b..38c7ea013361 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -299,7 +299,8 @@ struct mptcp_sock { cork:1, nodelay:1, fastopening:1, - in_accept_queue:1; + in_accept_queue:1, + free_first:1; struct work_struct work; struct sk_buff *ooo_last_skb; struct rb_root out_of_order_queue; @@ -308,12 +309,10 @@ struct mptcp_sock { struct list_head rtx_queue; struct mptcp_data_frag *first_pending; struct list_head join_list; - struct socket *subflow; /* outgoing connect/listener/!mp_capable - * The mptcp ops can safely dereference, using suitable - * ONCE annotation, the subflow outside the socket - * lock as such sock is freed after close(). - */ - struct sock *first; + struct sock *first; /* The mptcp ops can safely dereference, using suitable + * ONCE annotation, the subflow outside the socket + * lock as such sock is freed after close(). + */ struct mptcp_pm_data pm; struct { u32 space; /* bytes copied in last measurement window */ |