netdev - Re: [RFC PATCH iwl-next 2/6] ip_tunnel: convert _

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Date: Fri, 2 Jun 2023 15:19:52 +0200
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: Marcin Szycik <marcin.szycik@...ux.intel.com>
CC: <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>,
	<wojciech.drewek@...el.com>, <michal.swiatkowski@...ux.intel.com>,
	<alexandr.lobakin@...el.com>, <davem@...emloft.net>, <kuba@...nel.org>,
	<jiri@...nulli.us>, <pabeni@...hat.com>, <jesse.brandeburg@...el.com>,
	<simon.horman@...igine.com>, <idosch@...dia.com>
Subject: Re: [RFC PATCH iwl-next 2/6] ip_tunnel: convert __be16 tunnel flags
 to bitmaps

From: Marcin Szycik <marcin.szycik@...ux.intel.com>
Date: Thu, 1 Jun 2023 15:19:25 +0200

> From: Alexander Lobakin <alexandr.lobakin@...el.com>
> 
> Historically, tunnel flags like TUNNEL_CSUM or TUNNEL_ERSPAN_OPT
> have been defined as __be16. Now all of those 16 bits are occupied
> and there's no more free space for new flags.
> It can't be simply switched to a bigger container with no
> adjustments to the values, since it's an explicit Endian storage,
> and on LE systems (__be16)0x0001 equals to
> (__be64)0x0001000000000000.
[...]

Little comment on this: yes, I'm planning to extend UAPI to be able to
use more bits, but using Netlink bigint, which I posted last autumn,
then switched to another project, now I'm a little (a ton) busy with
urgent another one... Hopefully I'll send v3 in 2 weeks or so.
PFCP doesn't depend on it anyway, so this can be done separately.

Thanks,
Olek