From patchwork Mon Nov 16 09:48:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Abeni X-Patchwork-Id: 325146 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=-9.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS 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 20054C4742C for ; Mon, 16 Nov 2020 10:30:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C2D972223C for ; Mon, 16 Nov 2020 10:30:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="ZCuOIOIp" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728730AbgKPJsy (ORCPT ); Mon, 16 Nov 2020 04:48:54 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:49336 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728682AbgKPJsx (ORCPT ); Mon, 16 Nov 2020 04:48:53 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1605520132; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=bBjs+eItgvmlH/fD6oswebhIMYYLw1+545fJPhiMVHI=; b=ZCuOIOIp/C6ZTUkw/Ohm/mtn3uc1KeBzOQ927QqmFTP6sCu/hX/aWHVwG2ZrukF72zgwpp rTH8dSedoVShGv3ji1DRtQqEKx07BgMGxa1Uxdm4oN9OcKc9d5f6m8OscWfSXb05fZ6cQl hQHAkQt6mOM38EkOz4S3aNGCMS7qczs= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-50-2OXAO0ghObWZJxQhC-Wi-g-1; Mon, 16 Nov 2020 04:48:50 -0500 X-MC-Unique: 2OXAO0ghObWZJxQhC-Wi-g-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 8A5431018729; Mon, 16 Nov 2020 09:48:49 +0000 (UTC) Received: from gerbillo.redhat.com (ovpn-114-64.ams2.redhat.com [10.36.114.64]) by smtp.corp.redhat.com (Postfix) with ESMTP id 63B751002C18; Mon, 16 Nov 2020 09:48:48 +0000 (UTC) From: Paolo Abeni To: netdev@vger.kernel.org Cc: Eric Dumazet , mptcp@lists.01.org, Jakub Kicinski Subject: [PATCH net-next v3 13/13] mptcp: send explicit ack on delayed ack_seq incr Date: Mon, 16 Nov 2020 10:48:14 +0100 Message-Id: <1ccf235121023b2383eeabf452ce044f648e3f76.1605458224.git.pabeni@redhat.com> In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org When the worker moves some bytes from the OoO queue into the receive queue, the msk->ask_seq is updated, the MPTCP-level ack carrying that value needs to wait the next ingress packet, possibly slowing down or hanging the peer Signed-off-by: Paolo Abeni --- net/mptcp/protocol.c | 34 +++++++++++++++++++++------------- 1 file changed, 21 insertions(+), 13 deletions(-) diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 5a92b9239909..8df013daea88 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -407,13 +407,27 @@ static void mptcp_set_timeout(const struct sock *sk, const struct sock *ssk) mptcp_sk(sk)->timer_ival = tout > 0 ? tout : TCP_RTO_MIN; } -static void mptcp_check_data_fin(struct sock *sk) +static void mptcp_send_ack(struct mptcp_sock *msk) +{ + struct mptcp_subflow_context *subflow; + + mptcp_for_each_subflow(msk, subflow) { + struct sock *ssk = mptcp_subflow_tcp_sock(subflow); + + lock_sock(ssk); + tcp_send_ack(ssk); + release_sock(ssk); + } +} + +static bool mptcp_check_data_fin(struct sock *sk) { struct mptcp_sock *msk = mptcp_sk(sk); u64 rcv_data_fin_seq; + bool ret = false; if (__mptcp_check_fallback(msk) || !msk->first) - return; + return ret; /* Need to ack a DATA_FIN received from a peer while this side * of the connection is in ESTABLISHED, FIN_WAIT1, or FIN_WAIT2. @@ -429,8 +443,6 @@ static void mptcp_check_data_fin(struct sock *sk) */ if (mptcp_pending_data_fin(sk, &rcv_data_fin_seq)) { - struct mptcp_subflow_context *subflow; - WRITE_ONCE(msk->ack_seq, msk->ack_seq + 1); WRITE_ONCE(msk->rcv_data_fin, 0); @@ -454,17 +466,12 @@ static void mptcp_check_data_fin(struct sock *sk) break; } + ret = true; mptcp_set_timeout(sk, NULL); - mptcp_for_each_subflow(msk, subflow) { - struct sock *ssk = mptcp_subflow_tcp_sock(subflow); - - lock_sock(ssk); - tcp_send_ack(ssk); - release_sock(ssk); - } - + mptcp_send_ack(msk); mptcp_close_wake_up(sk); } + return ret; } static bool __mptcp_move_skbs_from_subflow(struct mptcp_sock *msk, @@ -1547,7 +1554,8 @@ static bool __mptcp_move_skbs(struct mptcp_sock *msk) } while (!done); if (mptcp_ofo_queue(msk) || moved > 0) { - mptcp_check_data_fin((struct sock *)msk); + if (!mptcp_check_data_fin((struct sock *)msk)) + mptcp_send_ack(msk); return true; } return false;