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-rw-r--r--lib/diameter/src/transport/diameter_sctp.erl30
1 files changed, 28 insertions, 2 deletions
diff --git a/lib/diameter/src/transport/diameter_sctp.erl b/lib/diameter/src/transport/diameter_sctp.erl
index 4f56475529..0d8fb37629 100644
--- a/lib/diameter/src/transport/diameter_sctp.erl
+++ b/lib/diameter/src/transport/diameter_sctp.erl
@@ -105,6 +105,7 @@
packet = true :: boolean() %% legacy transport_data?
| raw,
message_cb = false :: false | diameter:eval(),
+ unordered = false :: boolean() | 0 | 1, %% send unordered?
send = false :: pid() | boolean()}). %% sending process
%% Monitor process state.
@@ -677,7 +678,11 @@ send(#diameter_packet{transport_data = {outstream, SId}}
= S) ->
send(SId rem OS, Msg, S);
-%% ... or not: rotate through all streams.
+%% ... or not: send unordered on a lone stream ...
+send(Msg, #transport{unordered = true} = S) ->
+ send(0, Msg, S);
+
+%% ... or rotate through all.
send(Msg, #transport{streams = {_, OS},
os = N}
= S) ->
@@ -725,6 +730,7 @@ recv({_, #sctp_assoc_change{state = comm_up,
%% Deal with different association id after peeloff on Solaris by
%% taking the id from the first reception.
up(S#transport{assoc_id = T == accept orelse Id,
+ unordered = 1 == OS andalso 1,
streams = {IS, OS}});
%% ... or not: try the next address.
@@ -749,7 +755,7 @@ recv({[#sctp_sndrcvinfo{assoc_id = Id}], _Bin}
%% Inbound Diameter message.
recv({[#sctp_sndrcvinfo{}], Bin} = Msg, S)
when is_binary(Bin) ->
- message(recv, Msg, S);
+ message(recv, Msg, recv(S));
recv({_, #sctp_shutdown_event{}}, _) ->
stop;
@@ -769,6 +775,26 @@ recv({_, #sctp_paddr_change{}}, _) ->
recv({_, #sctp_pdapi_event{}}, _) ->
ok.
+%% recv/1
+%%
+%% Start sending unordered on a lone outbound stream after the second
+%% reception, so that an outgoing CER/CEA will arrive at the peer
+%% before another request.
+
+recv(#transport{unordered = B} = S)
+ when is_boolean(B) ->
+ S;
+
+recv(#transport{unordered = 0, socket = Sock} = S) ->
+ ok = inet:setopts(Sock, [{sctp_default_send_param,
+ #sctp_sndrcvinfo{flags = [unordered]}}]),
+ S#transport{unordered = true};
+
+recv(#transport{unordered = N} = S) ->
+ S#transport{unordered = N-1}.
+
+%% publish/4
+
publish(T, Ref, Id, Sock) ->
true = diameter_reg:add_new({?MODULE, T, {Ref, {Id, Sock}}}),
putr(?INFO_KEY, {gen_sctp, Sock}). %% for info/1