2 * Copyright (c) 2017 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <vnet/tcp/tcp.h>
19 newreno_congestion (tcp_connection_t * tc)
21 tc->prev_ssthresh = tc->ssthresh;
22 tc->ssthresh = clib_max (tcp_flight_size (tc) / 2, 2 * tc->snd_mss);
26 newreno_recovered (tcp_connection_t * tc)
28 tc->cwnd = tc->ssthresh;
32 newreno_rcv_ack (tcp_connection_t * tc)
34 if (tcp_in_slowstart (tc))
36 tc->cwnd += clib_min (tc->snd_mss, tc->bytes_acked);
40 /* Round up to 1 if needed */
41 tc->cwnd += clib_max ((tc->snd_mss * tc->snd_mss) / tc->cwnd, 1);
46 newreno_rcv_cong_ack (tcp_connection_t * tc, tcp_cc_ack_t ack_type)
48 if (ack_type == TCP_CC_DUPACK)
50 tc->cwnd += tc->snd_mss;
52 else if (ack_type == TCP_CC_PARTIALACK)
54 tc->cwnd -= tc->bytes_acked;
55 if (tc->bytes_acked > tc->snd_mss)
56 tc->bytes_acked += tc->snd_mss;
61 newreno_conn_init (tcp_connection_t * tc)
63 tc->ssthresh = tc->snd_wnd;
64 tc->cwnd = tcp_initial_cwnd (tc);
67 const static tcp_cc_algorithm_t tcp_newreno = {
68 .congestion = newreno_congestion,
69 .recovered = newreno_recovered,
70 .rcv_ack = newreno_rcv_ack,
71 .rcv_cong_ack = newreno_rcv_cong_ack,
72 .init = newreno_conn_init
76 newreno_init (vlib_main_t * vm)
78 clib_error_t *error = 0;
80 tcp_cc_algo_register (TCP_CC_NEWRENO, &tcp_newreno);
85 VLIB_INIT_FUNCTION (newreno_init);
88 * fd.io coding-style-patch-verification: ON
91 * eval: (c-set-style "gnu")