From patchwork Wed Aug 22 21:43:13 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kevin(Yudong) Yang" X-Patchwork-Id: 961078 Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.b="VylM1z2W"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 41wgym6gQZz9s47 for ; Thu, 23 Aug 2018 07:43:28 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727841AbeHWBKC (ORCPT ); Wed, 22 Aug 2018 21:10:02 -0400 Received: from mail-qk0-f201.google.com ([209.85.220.201]:40891 "EHLO mail-qk0-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727007AbeHWBKC (ORCPT ); Wed, 22 Aug 2018 21:10:02 -0400 Received: by mail-qk0-f201.google.com with SMTP id 93-v6so2838568qkq.7 for ; Wed, 22 Aug 2018 14:43:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=fC2CM39WuQGsojIVmuEAmtlKKvfJ0vN0UHEQa64kHmI=; b=VylM1z2WQYY4ph10FoNKCD4mF+QVGxnAbO7ptO4S3/mWIGQm9z1t1VC9zoa8VsFrvi mmr4gQsC55qYB27DREdLU67Xm/Y65AUT66PxbuIi5qJ9Tn+PhcKzWBLsF7iyHZZDnxlH 1LxgGxGrAZCIil3xr0oOdA8EsDxgfi343ueLQUEftpt2jDWF7P1z5cr/NITR/Yip/g7q zOZybfJH8UMunTxymIpqIU4gOWIEW/sRIRwpwd8CHtReg3IJOOJKlTG5mgPRcK39WaDO 349wuXhuYCiwDH/30CfsTB4yvfodzD3Unn7oji3K6WWaSk0PM32pqXu35ci4xA+kAXC0 7pTA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=fC2CM39WuQGsojIVmuEAmtlKKvfJ0vN0UHEQa64kHmI=; b=eoSTWb/iz41M5N3VLIjzN1fWyFxufAVwlnwKLTWd3tSPCYe5Bpav2NCk/ap/pA37YF q6FxDKuZfoMHYQzM8dwSCCKUvAvHl/46t2ydaIGQyHdWpg6z62+O7qSComj59UGF8gzz oBnrRLeN7Iu6aFt8OY76140j2faPIUpce/hIjcUz5UO9OjRJNVCb2LM/eYzKAvNAla9e e1YjeldsWyQsLzP7b3oiz7/+cfEFjm5YQI/Wz3Y1Mtqz1rqh0DbFsnG+UVoJ+Ni0TjmK OD9GFt/ecbqOsteA3qkDTBNM5qXiLIVOQ9wtpdGC7Uc6y+LiFSBsuh3tMGDzLuwG4l1s E1QQ== X-Gm-Message-State: AOUpUlGSXFPjGtH8m8So+jGY/WAKhBpPb2bEzw1NTXL//tQnJ19pKQNQ sbr5tA9azqjpUf/o+agh1luMpPE= X-Google-Smtp-Source: AA+uWPz7YFrzZR8Vegp/dCZzsJIdUFkg+3SldMbLuinAkY9C/YBhLw2YQwBatvyMFdVaV8A/KzMVZfo= X-Received: by 2002:ac8:3276:: with SMTP id y51-v6mr15212583qta.48.1534974205971; Wed, 22 Aug 2018 14:43:25 -0700 (PDT) Date: Wed, 22 Aug 2018 17:43:13 -0400 Message-Id: <20180822214316.174161-1-yyd@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.18.0.1017.ga543ac7ca45-goog Subject: [PATCH net 0/3] tcp_bbr: PROBE_RTT minor bug fixes From: Kevin Yang To: David Miller Cc: netdev@vger.kernel.org, "Kevin(Yudong) Yang" Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: "Kevin(Yudong) Yang" This series includes two minor bug fixes for the TCP BBR PROBE_RTT mechanism, and one preparatory patch: (1) A preparatory patch to reorganize the PROBE_RTT logic by refactoring (into its own function) the code to exit PROBE_RTT, since the next patch will be using that code in a new context. (2) Fix: When BBR restarts from idle and if BBR is in PROBE_RTT mode, BBR should check if it's time to exit PROBE_RTT. If yes, then BBR should exit PROBE_RTT mode and restore the cwnd to its full value. (3) Fix: Apply the PROBE_RTT cwnd cap even if the count of fully-ACKed packets is 0. Kevin Yang (3): tcp_bbr: add bbr_check_probe_rtt_done() helper tcp_bbr: in restart from idle, see if we should exit PROBE_RTT tcp_bbr: apply PROBE_RTT cwnd cap even if acked==0 net/ipv4/tcp_bbr.c | 42 ++++++++++++++++++++++++------------------ 1 file changed, 24 insertions(+), 18 deletions(-)