From patchwork Wed Mar 18 09:43:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Ilpo_J=C3=A4rvinen?= X-Patchwork-Id: 222312 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, 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 D9114C10DCE for ; Wed, 18 Mar 2020 09:44:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AB85720767 for ; Wed, 18 Mar 2020 09:44:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727609AbgCRJn4 (ORCPT ); Wed, 18 Mar 2020 05:43:56 -0400 Received: from smtp-rs2-vallila1.fe.helsinki.fi ([128.214.173.73]:51584 "EHLO smtp-rs2-vallila1.fe.helsinki.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727586AbgCRJnz (ORCPT ); Wed, 18 Mar 2020 05:43:55 -0400 Received: from whs-18.cs.helsinki.fi (whs-18.cs.helsinki.fi [128.214.166.46]) by smtp-rs2.it.helsinki.fi (8.14.7/8.14.7) with ESMTP id 02I9hoeq012845; Wed, 18 Mar 2020 11:43:50 +0200 Received: by whs-18.cs.helsinki.fi (Postfix, from userid 1070048) id C6600360F45; Wed, 18 Mar 2020 11:43:50 +0200 (EET) From: =?iso-8859-1?q?Ilpo_J=E4rvinen?= To: netdev@vger.kernel.org Cc: Yuchung Cheng , Neal Cardwell , Eric Dumazet , Olivier Tilmans Subject: [RFC PATCH 07/28] tcp: rework {__, }tcp_ecn_check_ce() -> tcp_data_ecn_check() Date: Wed, 18 Mar 2020 11:43:11 +0200 Message-Id: <1584524612-24470-8-git-send-email-ilpo.jarvinen@helsinki.fi> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1584524612-24470-1-git-send-email-ilpo.jarvinen@helsinki.fi> References: <1584524612-24470-1-git-send-email-ilpo.jarvinen@helsinki.fi> MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Ilpo Järvinen Rename tcp_ecn_check_ce to tcp_data_ecn_check as it is called only for data segments, not for ACKs (with AccECN, also ACKs may get ECN bits). The extra "layer" in tcp_ecn_check_ce() function just checks for ECN being enabled, that can be moved into tcp_ecn_field_check rather than having the __ variant. No functional changes. Signed-off-by: Ilpo Järvinen --- net/ipv4/tcp_input.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index e49a6f7ad5ce..2f0a9a2ee5c1 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -273,10 +273,13 @@ static void tcp_ecn_withdraw_cwr(struct tcp_sock *tp) tp->ecn_flags &= ~TCP_ECN_QUEUE_CWR; } -static void __tcp_ecn_check_ce(struct sock *sk, const struct sk_buff *skb) +static void tcp_data_ecn_check(struct sock *sk, const struct sk_buff *skb) { struct tcp_sock *tp = tcp_sk(sk); + if (!(tcp_sk(sk)->ecn_flags & TCP_ECN_OK)) + return; + switch (TCP_SKB_CB(skb)->ip_dsfield & INET_ECN_MASK) { case INET_ECN_NOT_ECT: /* Funny extension: if ECT is not set on a segment, @@ -305,12 +308,6 @@ static void __tcp_ecn_check_ce(struct sock *sk, const struct sk_buff *skb) } } -static void tcp_ecn_check_ce(struct sock *sk, const struct sk_buff *skb) -{ - if (tcp_sk(sk)->ecn_flags & TCP_ECN_OK) - __tcp_ecn_check_ce(sk, skb); -} - static void tcp_ecn_rcv_synack(struct tcp_sock *tp, const struct tcphdr *th) { if ((tp->ecn_flags & TCP_ECN_OK) && (!th->ece || th->cwr)) @@ -717,7 +714,7 @@ static void tcp_event_data_recv(struct sock *sk, struct sk_buff *skb) } icsk->icsk_ack.lrcvtime = now; - tcp_ecn_check_ce(sk, skb); + tcp_data_ecn_check(sk, skb); if (skb->len >= 128) tcp_grow_window(sk, skb); @@ -4578,7 +4575,7 @@ static void tcp_data_queue_ofo(struct sock *sk, struct sk_buff *skb) u32 seq, end_seq; bool fragstolen; - tcp_ecn_check_ce(sk, skb); + tcp_data_ecn_check(sk, skb); if (unlikely(tcp_try_rmem_schedule(sk, skb, skb->truesize))) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPOFODROP);