From patchwork Fri Mar 13 16:47:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pengcheng Yang X-Patchwork-Id: 222545 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 67299C10DCE for ; Fri, 13 Mar 2020 17:07:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 43E792076C for ; Fri, 13 Mar 2020 17:07:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726726AbgCMRHd (ORCPT ); Fri, 13 Mar 2020 13:07:33 -0400 Received: from aliyun-cloud.icoremail.net ([47.90.73.12]:25355 "HELO aliyun-sdnproxy-4.icoremail.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with SMTP id S1726721AbgCMRHd (ORCPT ); Fri, 13 Mar 2020 13:07:33 -0400 X-Greylist: delayed 717 seconds by postgrey-1.27 at vger.kernel.org; Fri, 13 Mar 2020 13:07:32 EDT Received: from 137.localdomain (unknown [218.107.205.216]) by app2 (Coremail) with SMTP id 4zNnewDnSNZEuWtesuYaAA--.224S4; Sat, 14 Mar 2020 00:48:13 +0800 (CST) From: Pengcheng Yang To: edumazet@google.com, davem@davemloft.net, ncardwell@google.com Cc: netdev@vger.kernel.org, Pengcheng Yang Subject: [PATCH net-next 3/5] tcp: stretch ACK fixes in Veno prep Date: Sat, 14 Mar 2020 00:47:22 +0800 Message-Id: <1584118044-9798-3-git-send-email-yangpc@wangsu.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1584118044-9798-1-git-send-email-yangpc@wangsu.com> References: <1584118044-9798-1-git-send-email-yangpc@wangsu.com> X-CM-TRANSID: 4zNnewDnSNZEuWtesuYaAA--.224S4 X-Coremail-Antispam: 1UD129KBjvJXoW7uw1kAF13urWDGFyxKryrtFb_yoW8Ww47pa 43Wrs3KF1aqFs7KrZxAFWUJw45G3Z7KayUJ3y7CF1fXw4avr1a9FyDXr4YvrWUGrWxt3Wa vr4Uur1fKFn7ArDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUgI1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s1l8cAvFVAK 0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3wA2z4 x0Y4vE2Ix0cI8IcVCY1x0267AKxVWxJr0_GcWl84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2 z4x0Y4vEx4A2jsIEc7CjxVAFwI0_GcCE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4 xG64xvF2IEw4CE5I8CrVC2j2WlYx0E74AGY7Cv6cx26r48McvjeVCFs4IE7xkEbVWUJVW8 JwACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lc2xSY4AK67AK6r1l42 xK82IYc2Ij64vIr41l42xK82IY6x8ErcxFaVAv8VW8GwCFx2IqxVCFs4IE7xkEbVWUJVW8 JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1V AFwI0_JF0_Jw1lIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xII jxv20xvEc7CjxVAFwI0_Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4 A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU 0xZFpf9x0JjeNtxUUUUU= X-CM-SenderInfo: p1dqw1nf6zt0xjvxhudrp/ Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org No code logic has been changed in this patch. Signed-off-by: Pengcheng Yang --- net/ipv4/tcp_veno.c | 44 +++++++++++++++++++++++--------------------- 1 file changed, 23 insertions(+), 21 deletions(-) diff --git a/net/ipv4/tcp_veno.c b/net/ipv4/tcp_veno.c index 3b36bb1..857491c 100644 --- a/net/ipv4/tcp_veno.c +++ b/net/ipv4/tcp_veno.c @@ -153,31 +153,33 @@ static void tcp_veno_cong_avoid(struct sock *sk, u32 ack, u32 acked) veno->diff = (tp->snd_cwnd << V_PARAM_SHIFT) - target_cwnd; if (tcp_in_slow_start(tp)) { - /* Slow start. */ + /* Slow start. */ tcp_slow_start(tp, acked); + goto done; + } + + /* Congestion avoidance. */ + if (veno->diff < beta) { + /* In the "non-congestive state", increase cwnd + * every rtt. + */ + tcp_cong_avoid_ai(tp, tp->snd_cwnd, 1); } else { - /* Congestion avoidance. */ - if (veno->diff < beta) { - /* In the "non-congestive state", increase cwnd - * every rtt. - */ - tcp_cong_avoid_ai(tp, tp->snd_cwnd, 1); - } else { - /* In the "congestive state", increase cwnd - * every other rtt. - */ - if (tp->snd_cwnd_cnt >= tp->snd_cwnd) { - if (veno->inc && - tp->snd_cwnd < tp->snd_cwnd_clamp) { - tp->snd_cwnd++; - veno->inc = 0; - } else - veno->inc = 1; - tp->snd_cwnd_cnt = 0; + /* In the "congestive state", increase cwnd + * every other rtt. + */ + if (tp->snd_cwnd_cnt >= tp->snd_cwnd) { + if (veno->inc && + tp->snd_cwnd < tp->snd_cwnd_clamp) { + tp->snd_cwnd++; + veno->inc = 0; } else - tp->snd_cwnd_cnt++; - } + veno->inc = 1; + tp->snd_cwnd_cnt = 0; + } else + tp->snd_cwnd_cnt++; } +done: if (tp->snd_cwnd < 2) tp->snd_cwnd = 2; else if (tp->snd_cwnd > tp->snd_cwnd_clamp)