netdev - Re: [PATCH] net: ipv4: Cache pmtu for all packet paths if multipath enabled

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Message-ID: <59b0acc7-196c-4ab8-9033-336136a47212@kernel.org>
Date: Mon, 4 Nov 2024 20:52:36 -0700
From: David Ahern <dsahern@...nel.org>
To: Vladimir Vdovin <deliran@...dict.gg>, Ido Schimmel <idosch@...sch.org>
Cc: netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH] net: ipv4: Cache pmtu for all packet paths if multipath
 enabled

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?