From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 24B9BC742A7 for ; Fri, 10 Mar 2023 16:51:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230309AbjCJQv0 (ORCPT ); Fri, 10 Mar 2023 11:51:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40334 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231429AbjCJQuh (ORCPT ); Fri, 10 Mar 2023 11:50:37 -0500 Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4D834111694 for ; Fri, 10 Mar 2023 08:47:53 -0800 (PST) Received: by mail-pj1-x1035.google.com with SMTP id u3-20020a17090a450300b00239db6d7d47so5718533pjg.4 for ; Fri, 10 Mar 2023 08:47:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=networkplumber-org.20210112.gappssmtp.com; s=20210112; t=1678466873; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=UOq3+9hhBwKi8YAI1z5pWNSeEpaondyeR0mS3XKyWRY=; b=Q6rCUM9FtS9KAQBZ+MORtxJfGK7ZyAS6xKFO6c0qd8N8/MDS7S84NClUoWxENsjHlM musI+Zp9WmVbnuMrFYfbsgVumbO3n/MADHyKsNNZejszs++T3wknF3KjmV/R2ibTBFMO 1koO+R9pfzVlbN1yk2jJ1TCKWlJsnuA0DaBL2eNtn8yc6VQtEkT9own78qLnO/ddBd1B bpUkXaE0fZzniUZBqyvTzufDCgZAhTe/+BflMKrQ0LyYvZqwg2YdZ6o/DYi4w7WxkLIx ysggd9pSIq+FQKguKysj0dJilwQF44aGZywPvxm1LU1ICU8WKsSX9wtsIKAMYL508ME0 HpvQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678466873; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=UOq3+9hhBwKi8YAI1z5pWNSeEpaondyeR0mS3XKyWRY=; b=dFn0/RmVtQpgMyArwdBz5kw1RzGY/MXVv3/cpStgJC2GRt956jgGICf8Kimqno1cH+ zXMSlpf/RdrSjit2vaoJUDOspHnF0aKaITo70OzaUCLlRYiPMTsbOoneUSsYzpk7Lk44 ol2sXmV4AXgwfs9L9jA9yqt5pnht9bACaFtq7Vp8I4YdLTwIojrUa37G3uZzKe0Z+k33 R3D1AXylb7F76iWftluKbH8bkl3+Et/FnPfZV3X43vZhmkayhuaIYTnlcu2OOGwNkIgm xtWuZ1iAlMQTr1rn4wONvr/sfQhc/XTOcMnKOSkd8yZq1gXRauPq+fWUzWDfcnktXnq2 k9ow== X-Gm-Message-State: AO0yUKXKdeXbC5AkOOh/aGlUJyyqXwZifiBdyBDzijIIW2y7ptw3Mp3N iPv9iBhGSdM3GbsPkmDjM9msqA== X-Google-Smtp-Source: AK7set84KeoRRQtWag/SgYIwQfVfzAYFqVwC7ZtcpaO6AVmM4Exa37I4oTpkg7netGGhyU7YN3LG9A== X-Received: by 2002:a05:6a20:6d04:b0:cd:929d:280a with SMTP id fv4-20020a056a206d0400b000cd929d280amr21362288pzb.18.1678466872708; Fri, 10 Mar 2023 08:47:52 -0800 (PST) Received: from hermes.local (204-195-120-218.wavecable.com. [204.195.120.218]) by smtp.gmail.com with ESMTPSA id j9-20020aa78d09000000b005a8c60ce93bsm42686pfe.149.2023.03.10.08.47.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Mar 2023 08:47:52 -0800 (PST) Date: Fri, 10 Mar 2023 08:47:50 -0800 From: Stephen Hemminger To: Kui-Feng Lee Cc: , , , , , , , Subject: Re: [PATCH bpf-next v6 2/8] net: Update an existing TCP congestion control algorithm. Message-ID: <20230310084750.482e633e@hermes.local> In-Reply-To: <20230310043812.3087672-3-kuifeng@meta.com> References: <20230310043812.3087672-1-kuifeng@meta.com> <20230310043812.3087672-3-kuifeng@meta.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Thu, 9 Mar 2023 20:38:07 -0800 Kui-Feng Lee wrote: > This feature lets you immediately transition to another congestion > control algorithm or implementation with the same name. Once a name > is updated, new connections will apply this new algorithm. > > Signed-off-by: Kui-Feng Lee What is the use case and userspace API for this? The congestion control algorithm normally doesn't allow this because algorithm specific variables (current state of connection) may not work with another algorithm. Seems like you are opening Pandora's box here.