netdev - Re: [PATCH v4 net-next 08/19] inet: frags: use rhashtables for reassembly units

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Date:   Mon, 16 Apr 2018 14:54:49 +0200
From:   Stefan Schmidt <stefan@....samsung.com>
To:     Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Alexander Aring <aring@...atatu.com>
Subject: Re: [PATCH v4 net-next 08/19] inet: frags: use rhashtables for
 reassembly units

Hello Eric.


On 03/31/2018 09:58 PM, Eric Dumazet wrote:
> Some applications still rely on IP fragmentation, and to be fair linux
> reassembly unit is not working under any serious load.

[...]

> ---
>  Documentation/networking/ip-sysctl.txt  |   7 +-
>  include/net/inet_frag.h                 |  81 +++---
>  include/net/ipv6.h                      |  16 +-
>  net/ieee802154/6lowpan/6lowpan_i.h      |  26 +-
>  net/ieee802154/6lowpan/reassembly.c     |  93 +++----
>  net/ipv4/inet_fragment.c                | 354 +++++-------------------
>  net/ipv4/ip_fragment.c                  | 112 ++++----
>  net/ipv6/netfilter/nf_conntrack_reasm.c |  51 +---
>  net/ipv6/reassembly.c                   | 110 ++++----
>  9 files changed, 271 insertions(+), 579 deletions(-)
>

Just a heads up to let you know that this patch broke the 6LoWPAN fragmentation/reassembly
for 802.15.4

Simply initiating a ssh session will fail. After a 1.5 days git bisect session it pointed me to this
commit. :-) After reverting it (and some other patches of this series due to inter dependencies)
it started working again.

No further debugging on this from my side yet, as I just found it and wanted to let you know in
case you have an idea what's going on.

I will try to make some room this week to help with debugging and fixing.

regards
Stefan Schmidt