From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 3C3D5137C37 for ; Tue, 5 Nov 2024 03:52:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730778758; cv=none; b=cg5yETWES5O1yFHwgkLSR1pS4d6grqKDIwNznR6FjLco/xU7W7pjNsk4YfrAM4Sm70UbVbUbLuPOBVtApR6y23vBlFkU0mFe8e3Yb98GJNaC+XGLy5f45zvj8wsQvluN6cbJMFXm4OqTMaibwq+sZKztL3AAojdkQxefpJkHBW0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730778758; c=relaxed/simple; bh=pfVeG4MFFA34k6P9C8PtJGC8cWiDsHokC/HdvI0BwJY=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Ng9+kLncT3eKURdEEjXnTnHJD7pA33gNy+bnAhAUmWPVJyIkM3JeJd1OZY/6JXuZcQtwcbY/qiju80JlAc9Md7arZ1TM1VEzYF8zXyswYuIMyQ9z/Vh7AcSZGc58L9D6n+SbEaMVHqjkePq2+V4CqcqLNJa+kLuyz9ZUis6UDiA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=b8U6Z00o; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="b8U6Z00o" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 96EE9C4CECF; Tue, 5 Nov 2024 03:52:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730778757; bh=pfVeG4MFFA34k6P9C8PtJGC8cWiDsHokC/HdvI0BwJY=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=b8U6Z00osUo0u6ITHuyrvJnwD+d0rugVrrM5UZJ/t7g9rZFGi29i9ynPZb3G7odGz b/LtWfxLDsqGI/7Rd013djn67FItCz97Qb54FXpmJ7UnTXxxoJGV4wDFs5FLYguVy7 lS8+MXmuv/ih9xLCOL/6LfPphEeiru7CaG/0pnKVDHf+9+HO0F7yyFAYpUiYfc0HP9 CT8rzXqM6Zw4sSJ9w8ety8SsE3i3N7JSwVb5yELgxiHdH0+o4/TdjR0jMp8pqYnipx 9ohiu6a4P7iEW74h5ukYsfL5mu9u2tJfnbbYd3fmSyb6jFsYCIe0mDYuDY8QhUohSU 7pQls+lDKLp8w== Message-ID: <59b0acc7-196c-4ab8-9033-336136a47212@kernel.org> Date: Mon, 4 Nov 2024 20:52:36 -0700 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] net: ipv4: Cache pmtu for all packet paths if multipath enabled Content-Language: en-US To: Vladimir Vdovin , Ido Schimmel Cc: netdev@vger.kernel.org, davem@davemloft.net References: <20241029152206.303004-1-deliran@verdict.gg> <736cdd43-4c4b-4341-bd77-c9a365dec2e5@kernel.org> From: David Ahern In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/2/24 10:20 AM, Vladimir Vdovin wrote: >> >> Doesn't IPv6 suffer from a similar problem? I believe the answer is yes, but do not have time to find a reproducer right now. > > I am not very familiar with ipv6, > but I tried to reproduce same problem with my tests with same topology. > > ip netns exec ns_a-AHtoRb ip -6 r g fc00:1001::2:2 sport 30003 dport 443 > fc00:1001::2:2 via fc00:2::2 dev veth_A-R2 src fc00:1000::1:1 metric 1024 expires 495sec mtu 1500 pref medium > > ip netns exec ns_a-AHtoRb ip -6 r g fc00:1001::2:2 sport 30013 dport 443 > fc00:1001::2:2 via fc00:1::2 dev veth_A-R1 src fc00:1000::1:1 metric 1024 expires 484sec mtu 1500 pref medium > > It seems that there are no problems with ipv6. We have nhce entries for both paths. Does rt6_cache_allowed_for_pmtu return true or false for this test?