From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=91.218.175.80 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793234335; b=z7kc4ItAb8IRsoFYmVV9F8VweU8+yADqldzE/J6AlVUxEys4tOVxeGs7ylQZH+aKQgfR 5HQycWaVINmbKMfr9upubCvMmrgvHErKTy8No2lyc6hkOcLJH5jwXrxFWHQTH7obl7xuL euC0fbXBpBHtbm7Q75GhDF/nr2uyZCAXIWNPbSOB5lxSmJ6LovL2nF4nt8LiZj8/m4Vli sejQuwZsW+Db3bVQ/UvLB+Rxm9RbFQyoLNmHb3PhKmSdUL86W/lZ9PCV7YoECQwtJPZee AxD67VRocBZGbUS0ia9k4SnKQJj6n1SlA7++/zScW+BnwxShBUrLqDgd7rxk+5IDjnQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793234335; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:Date:From:To:Cc:Subject:Message-ID: References:MIME-Version:Content-Type:Content-Disposition:In-Reply-To; bh=LGUbBch1/OYdHnTxkjCH2wbrptcygGBhOyaO0PaTRYo=; b=qgzIJLKiGMb6OFkEXzz264nBquUU6brqVvDw6HP2N2vNq/oHBNdTxRIBS1G++eEouxIH PPqJeA47T9BJcBAZG9LhtG5KohwqLYk05cafXbNk4M7CtIQsnBQxFy59rftC7iKJFP804 C+Kbns9/LNWhD9PAvXTs9rTBMdisLMl/YvcIZqNb+8aCThuWOkTb1/jjCVGc6DgvXnsld wMlARdxv+VbF/svugxeKBRqqfsQHc+WZdgmzpIb3BRC1VtC4o4hBqkTpbQcRPs8Jaf55k 0DwDCFWYVRy3kyOP6w1l+/1fPp2IUzoju/uxBklJMAEVAfoZNG9+NG5EtcGFuzmx3Dg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b="A/Eks8PX"; arc=none smtp.remote-ip=91.218.175.80 Received: from mta0.migadu.com (out-80.mta0.migadu.com [91.218.175.80]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B2EE4606A31A for ; Thu, 29 Oct 2026 00:38:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org B2EE4606A31A Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=A/Eks8PX X-Envelope-To: netdev@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=tmMY9UeHWouXSyJW7uvlBsehOpe1njzsUfCIaw1Ok5Q=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1793234330; v=1; x=1793839130; b=A/Eks8PXc7FJckhaxUn8SyM1BRDX9urOaWjFyjZ0PVkxId2TUF3fDEofy/tNUC8tWxU9tOGp CkecdiMyfk2J6u56gUFscfMci24BqlNgix3fCfGy5d8pVESriT01AeE2+RYWpcZ9DmVBiULSXqC qZx+Of8cixvjNA3MS2HOmrR4= X-Envelope-To: netdev@vger.kernel.org Received: by mta11.migadu.com with ESMTPS id 435ee883788e7d0a; Thu, 29 Oct 2026 00:38:50 +0000 X-Mizu-Trace-ID: 435ee883788e7d0a X-Migadu-Flow: FLOW_OUT Date: Thu, 29 Oct 2026 08:38:42 +0800 From: Hangbin Liu To: Jakub Kicinski Cc: David Ahern , Ido Schimmel , "David S. Miller" , Eric Dumazet , Paolo Abeni , Simon Horman , Justin Iurman , Shuah Khan , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, Hangbin Liu Subject: Re: [PATCH 0/3] net: ioam6: makes IOAM insertion transparent to IPv6 ECMP Message-ID: References: <20261028-ipv6_ioam_ecmp-v1-0-9b6715b6f4c0@kylinos.cn> <20261028165812.1b40d1d4@kernel.org> X-Mailing-List: netdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261028165812.1b40d1d4@kernel.org> Hi Jakub, On Wed, Oct 28, 2026 at 04:58:12PM -0700, Jakub Kicinski wrote: > On Wed, 28 Oct 2026 16:01:13 +0800 Hangbin Liu wrote: > > On Wed, Oct 28, 2026 at 01:45:28PM +0800, Hangbin Liu wrote: > > > This series makes IOAM insertion transparent to IPv6 ECMP, as required > > > by RFC 9486 (C2): a packet carrying IOAM options must be forwarded > > > along the same path as the identical packet without them. > > > > Sorry, forgot to add target repo "net". I will add it in next version. > > CI bot says: > > The new selftest added alongside this series (tools/testing/selftests/net/ioam6_ecmp.sh) > is failing in our CI on the "Transit input ECMP with/without IOAM" scenario: > > TEST: Transit input ECMP with/without IOAM (diverged on seed 1: without IOAM via > link A, with IOAM via link B) [FAIL] > TEST: Transit input ECMP with/without IOAM (seed 2..12) [ OK ] > TEST: Encapsulating node re-lookup ECMP with/without IOAM (seed 1..12) [ OK ] > > 11 of the 12 "transit input" seeds pass, and the whole "encapsulating node re-lookup" > scenario passes on all seeds, so this looks like an edge case in the Hop-by-Hop > nexthdr-recovery logic used for the policy-0 multipath hash, rather than a test > infra/flake issue. Could you take a look at whether the recovered "virtual" nexthdr > (or the padding/option-length walk used to compute it) is correct for all IOAM option > layouts/trace sizes, since one specific packet still ends up hashed to a different ECMP > sibling than the equivalent packet without IOAM? Thanks for the report. I run it locally multi times and didn't got this issue. I will try reproduce it first and check the reason. Thanks Hangbin