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Date: Wed, 26 Jul 2017 17:35:31 +0800
From: kbuild test robot <lkp@...el.com>
To: Mao Wenan <maowenan@...wei.com>
Cc: kbuild-all@...org, netdev@...r.kernel.org, davem@...emloft.net,
weiyongjun1@...wei.com, chenweilong@...wei.com
Subject: Re: [PATCH net-next] TLP: Don't reschedule PTO when there's one
outstanding TLP retransmission.
Hi Mao,
[auto build test WARNING on net-next/master]
url: https://github.com/0day-ci/linux/commits/Mao-Wenan/TLP-Don-t-reschedule-PTO-when-there-s-one-outstanding-TLP-retransmission/20170726-172222
config: x86_64-randconfig-x000-201730 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
All warnings (new ones prefixed by >>):
net//ipv4/tcp_output.c: In function 'tcp_schedule_loss_probe':
>> net//ipv4/tcp_output.c:2430:3: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
s32 delta = rto_time_stamp - tcp_jiffies32;
^~~
vim +2430 net//ipv4/tcp_output.c
6ba8a3b1 Nandita Dukkipati 2013-03-11 2374
6ba8a3b1 Nandita Dukkipati 2013-03-11 2375 bool tcp_schedule_loss_probe(struct sock *sk)
6ba8a3b1 Nandita Dukkipati 2013-03-11 2376 {
6ba8a3b1 Nandita Dukkipati 2013-03-11 2377 struct inet_connection_sock *icsk = inet_csk(sk);
6ba8a3b1 Nandita Dukkipati 2013-03-11 2378 struct tcp_sock *tp = tcp_sk(sk);
6ba8a3b1 Nandita Dukkipati 2013-03-11 2379 u32 timeout, tlp_time_stamp, rto_time_stamp;
6ba8a3b1 Nandita Dukkipati 2013-03-11 2380
6ba8a3b1 Nandita Dukkipati 2013-03-11 2381 /* No consecutive loss probes. */
6ba8a3b1 Nandita Dukkipati 2013-03-11 2382 if (WARN_ON(icsk->icsk_pending == ICSK_TIME_LOSS_PROBE)) {
6ba8a3b1 Nandita Dukkipati 2013-03-11 2383 tcp_rearm_rto(sk);
6ba8a3b1 Nandita Dukkipati 2013-03-11 2384 return false;
6ba8a3b1 Nandita Dukkipati 2013-03-11 2385 }
6ba8a3b1 Nandita Dukkipati 2013-03-11 2386 /* Don't do any loss probe on a Fast Open connection before 3WHS
6ba8a3b1 Nandita Dukkipati 2013-03-11 2387 * finishes.
6ba8a3b1 Nandita Dukkipati 2013-03-11 2388 */
f9b99582 Yuchung Cheng 2015-09-18 2389 if (tp->fastopen_rsk)
6ba8a3b1 Nandita Dukkipati 2013-03-11 2390 return false;
6ba8a3b1 Nandita Dukkipati 2013-03-11 2391
6ba8a3b1 Nandita Dukkipati 2013-03-11 2392 /* TLP is only scheduled when next timer event is RTO. */
6ba8a3b1 Nandita Dukkipati 2013-03-11 2393 if (icsk->icsk_pending != ICSK_TIME_RETRANS)
6ba8a3b1 Nandita Dukkipati 2013-03-11 2394 return false;
6ba8a3b1 Nandita Dukkipati 2013-03-11 2395
6ba8a3b1 Nandita Dukkipati 2013-03-11 2396 /* Schedule a loss probe in 2*RTT for SACK capable connections
6ba8a3b1 Nandita Dukkipati 2013-03-11 2397 * in Open state, that are either limited by cwnd or application.
6ba8a3b1 Nandita Dukkipati 2013-03-11 2398 */
bec41a11 Yuchung Cheng 2017-01-12 2399 if ((sysctl_tcp_early_retrans != 3 && sysctl_tcp_early_retrans != 4) ||
bec41a11 Yuchung Cheng 2017-01-12 2400 !tp->packets_out || !tcp_is_sack(tp) ||
bec41a11 Yuchung Cheng 2017-01-12 2401 icsk->icsk_ca_state != TCP_CA_Open)
6ba8a3b1 Nandita Dukkipati 2013-03-11 2402 return false;
6ba8a3b1 Nandita Dukkipati 2013-03-11 2403
6ba8a3b1 Nandita Dukkipati 2013-03-11 2404 if ((tp->snd_cwnd > tcp_packets_in_flight(tp)) &&
6ba8a3b1 Nandita Dukkipati 2013-03-11 2405 tcp_send_head(sk))
6ba8a3b1 Nandita Dukkipati 2013-03-11 2406 return false;
6ba8a3b1 Nandita Dukkipati 2013-03-11 2407
bb4d991a Yuchung Cheng 2017-07-19 2408 /* Probe timeout is 2*rtt. Add minimum RTO to account
f9b99582 Yuchung Cheng 2015-09-18 2409 * for delayed ack when there's one outstanding packet. If no RTT
f9b99582 Yuchung Cheng 2015-09-18 2410 * sample is available then probe after TCP_TIMEOUT_INIT.
6ba8a3b1 Nandita Dukkipati 2013-03-11 2411 */
bb4d991a Yuchung Cheng 2017-07-19 2412 if (tp->srtt_us) {
bb4d991a Yuchung Cheng 2017-07-19 2413 timeout = usecs_to_jiffies(tp->srtt_us >> 2);
6ba8a3b1 Nandita Dukkipati 2013-03-11 2414 if (tp->packets_out == 1)
bb4d991a Yuchung Cheng 2017-07-19 2415 timeout += TCP_RTO_MIN;
bb4d991a Yuchung Cheng 2017-07-19 2416 else
bb4d991a Yuchung Cheng 2017-07-19 2417 timeout += TCP_TIMEOUT_MIN;
bb4d991a Yuchung Cheng 2017-07-19 2418 } else {
bb4d991a Yuchung Cheng 2017-07-19 2419 timeout = TCP_TIMEOUT_INIT;
bb4d991a Yuchung Cheng 2017-07-19 2420 }
6ba8a3b1 Nandita Dukkipati 2013-03-11 2421
6ba8a3b1 Nandita Dukkipati 2013-03-11 2422 /* If RTO is shorter, just schedule TLP in its place. */
ac9517fc Eric Dumazet 2017-05-16 2423 tlp_time_stamp = tcp_jiffies32 + timeout;
6ba8a3b1 Nandita Dukkipati 2013-03-11 2424 rto_time_stamp = (u32)inet_csk(sk)->icsk_timeout;
6ba8a3b1 Nandita Dukkipati 2013-03-11 2425 if ((s32)(tlp_time_stamp - rto_time_stamp) > 0) {
e41572cd Mao Wenan 2017-07-25 2426 /*It is no need to reschedule PTO when there is one outstanding TLP retransmission*/
e41572cd Mao Wenan 2017-07-25 2427 if (tp->tlp_high_seq) {
e41572cd Mao Wenan 2017-07-25 2428 return false;
e41572cd Mao Wenan 2017-07-25 2429 }
ac9517fc Eric Dumazet 2017-05-16 @2430 s32 delta = rto_time_stamp - tcp_jiffies32;
6ba8a3b1 Nandita Dukkipati 2013-03-11 2431 if (delta > 0)
6ba8a3b1 Nandita Dukkipati 2013-03-11 2432 timeout = delta;
6ba8a3b1 Nandita Dukkipati 2013-03-11 2433 }
6ba8a3b1 Nandita Dukkipati 2013-03-11 2434
6ba8a3b1 Nandita Dukkipati 2013-03-11 2435 inet_csk_reset_xmit_timer(sk, ICSK_TIME_LOSS_PROBE, timeout,
6ba8a3b1 Nandita Dukkipati 2013-03-11 2436 TCP_RTO_MAX);
6ba8a3b1 Nandita Dukkipati 2013-03-11 2437 return true;
6ba8a3b1 Nandita Dukkipati 2013-03-11 2438 }
6ba8a3b1 Nandita Dukkipati 2013-03-11 2439
:::::: The code at line 2430 was first introduced by commit
:::::: ac9517fcf310327fa3e3b0d8366e4b11236b1b4b tcp: replace misc tcp_time_stamp to tcp_jiffies32
:::::: TO: Eric Dumazet <edumazet@...gle.com>
:::::: CC: David S. Miller <davem@...emloft.net>
---
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