From patchwork Wed May 17 12:41:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Menglong Dong X-Patchwork-Id: 13244844 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 14C7D1549B for ; Wed, 17 May 2023 12:42:14 +0000 (UTC) Received: from mail-pf1-x444.google.com (mail-pf1-x444.google.com [IPv6:2607:f8b0:4864:20::444]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9E462E7A; Wed, 17 May 2023 05:42:11 -0700 (PDT) Received: by mail-pf1-x444.google.com with SMTP id d2e1a72fcca58-643ac91c51fso534320b3a.1; Wed, 17 May 2023 05:42:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1684327331; x=1686919331; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=EPpBzc8U46icZRxTtg/C9J0WiKkv45MAA53fWrbYIQ0=; b=O60dhM/uIO2RqpUb7HUDbbNgTo94TW9EJxg6BGTAGlyvmhisydQeE0inp1u2RKYPvi bKCqR1opFS9yNdG42a5ozgD7QJ/s9VklocbsMdwNxDdiezOfaPBLGMoX0bcfofKwqhQQ sjR5ZG3PcopHSV41gHDVuwymYhNagQZQSRUpQ5aZhZiw7uLApDsO4jLVAOPQUKcz+OIh wrdaAxT22GLsKMoI9KTUG6yGNMdNWaYmsMH7lyrBu37rNkyhGm52tonO4O6B7ZRFDK/g IMRe9rJjQaJtjU+KXocNduhoNq9W/+hjKeyc0Ek52dkdRgAc7hwrHdn6aD8lq0U8gxkP qmPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684327331; x=1686919331; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=EPpBzc8U46icZRxTtg/C9J0WiKkv45MAA53fWrbYIQ0=; b=N5w7bQeZ0Vqr332K8n7XifxCNg5PECj5OZGaq8HKFtb4YxpcsJ4nzlvCzsE1NsKZ1/ vHt7LuareLtI34gS1losRss44+5LiCvvDFj42ueIsUlvhSEQbl/A5tJqCkDxzEWd73JF rOOLaHDoh6meP/rDiKw3vvOv9SWayNJAQfIxLfjhRfsxtb7x+S88NJ5bOzPkrmHyTjJn wXRWQA2NjiQYu9C02NlzOZnshDQutnu+kIVyqokyMvzY0zKxEMen8dOOo/o1imwdinGH KLgBoalzpDsb/InyhivC7EC4NOPA1tI2PBb+KdWLYbiOVesGcfFwQZLMbmeYvlho2avf wP0A== X-Gm-Message-State: AC+VfDy0fudbE9CEsyNNUDobSMRB1OH5Hop8/WVAnVVZVKwz4twqMlNm TXsdjBbgJEsLKleoqXS26H4= X-Google-Smtp-Source: ACHHUZ5JkhPKg6y+ftOY75hoFRteYiVtRue48NakVXk5fALEe9HQFGwyEqQxmvlxq5iRTDd2mP8uwQ== X-Received: by 2002:a05:6a21:6da4:b0:100:8258:169e with SMTP id wl36-20020a056a216da400b001008258169emr45051800pzb.24.1684327331107; Wed, 17 May 2023 05:42:11 -0700 (PDT) Received: from localhost.localdomain ([81.70.217.19]) by smtp.gmail.com with ESMTPSA id u23-20020aa78497000000b0064aea45b040sm9244224pfn.168.2023.05.17.05.42.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 May 2023 05:42:10 -0700 (PDT) From: menglong8.dong@gmail.com X-Google-Original-From: imagedong@tencent.com To: kuba@kernel.org Cc: davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, dsahern@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Menglong Dong Subject: [PATCH net-next 1/3] net: tcp: add sysctl for controling tcp window shrink Date: Wed, 17 May 2023 20:41:59 +0800 Message-Id: <20230517124201.441634-2-imagedong@tencent.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230517124201.441634-1-imagedong@tencent.com> References: <20230517124201.441634-1-imagedong@tencent.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org From: Menglong Dong Introduce the sysctl 'tcp_wnd_shrink', which will be used in the following patches. Signed-off-by: Menglong Dong --- include/net/tcp.h | 1 + net/ipv4/sysctl_net_ipv4.c | 9 +++++++++ net/ipv4/tcp.c | 3 +++ 3 files changed, 13 insertions(+) diff --git a/include/net/tcp.h b/include/net/tcp.h index a0a91a988272..a6cf6d823e34 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -247,6 +247,7 @@ void tcp_time_wait(struct sock *sk, int state, int timeo); /* sysctl variables for tcp */ extern int sysctl_tcp_max_orphans; extern long sysctl_tcp_mem[3]; +extern int sysctl_tcp_wnd_shrink; #define TCP_RACK_LOSS_DETECTION 0x1 /* Use RACK to detect losses */ #define TCP_RACK_STATIC_REO_WND 0x2 /* Use static RACK reo wnd */ diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c index 0d0cc4ef2b85..fd6cb5a5c2b9 100644 --- a/net/ipv4/sysctl_net_ipv4.c +++ b/net/ipv4/sysctl_net_ipv4.c @@ -577,6 +577,15 @@ static struct ctl_table ipv4_table[] = { .extra1 = &sysctl_fib_sync_mem_min, .extra2 = &sysctl_fib_sync_mem_max, }, + { + .procname = "tcp_wnd_shrink", + .data = &sysctl_tcp_wnd_shrink, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = SYSCTL_ZERO, + .extra2 = SYSCTL_ONE + }, { } }; diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index fd68d49490f2..db0483b2159f 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -297,6 +297,9 @@ EXPORT_SYMBOL(tcp_memory_allocated); DEFINE_PER_CPU(int, tcp_memory_per_cpu_fw_alloc); EXPORT_PER_CPU_SYMBOL_GPL(tcp_memory_per_cpu_fw_alloc); +int sysctl_tcp_wnd_shrink __read_mostly; +EXPORT_SYMBOL(sysctl_tcp_wnd_shrink); + #if IS_ENABLED(CONFIG_SMC) DEFINE_STATIC_KEY_FALSE(tcp_have_smc); EXPORT_SYMBOL(tcp_have_smc);