netdev - Re: [Intel-wired-lan] [PATCH net-next RESENT v3] ethtool: ice: Support for RSS settings to GTP from ethtool

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Date: Wed, 31 Jan 2024 12:15:41 +0900
From: takeru hayasaka <hayatake396@...il.com>
To: Harald Welte <laforge@...monks.org>
Cc: Marcin Szycik <marcin.szycik@...ux.intel.com>, 
	Jesse Brandeburg <jesse.brandeburg@...el.com>, Tony Nguyen <anthony.l.nguyen@...el.com>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Jonathan Corbet <corbet@....net>, 
	linux-doc@...r.kernel.org, vladimir.oltean@....com, 
	linux-kernel@...r.kernel.org, intel-wired-lan@...ts.osuosl.org, 
	netdev@...r.kernel.org, mailhol.vincent@...adoo.fr
Subject: Re: [Intel-wired-lan] [PATCH net-next RESENT v3] ethtool: ice:
 Support for RSS settings to GTP from ethtool

Hi Harald-san

I apologize for the delay in making further progress on this
patch.(I'm three months late...

> There are many different GTPv2C messages

Thank you for your assistance in explaining GTPC:)

Thanks,
Takeru

2024年1月30日(火) 19:15 Harald Welte <laforge@...monks.org>:
>
> hi Marcin,
>
> Disclaimer: I have no understanding of the proposed implementation here, just commenting
> on this from a 3GPP protocol architecture point of view.
>
> On Tue, Jan 30, 2024 at 10:59:40AM +0100, Marcin Szycik wrote:
> > >> gtpc(4|6) doesn't include TEID, so what is its purpose?
> > > In GTPC communication, there is no TEID in the CSR (Create Session Request).
> > > Therefore, there are cases of GTPC that do not include TEID.
> >
> > The way I understand it now, this patch (and the ethtool one) adds hashing on
> > TEID field in GTP* headers. So I wanted to ask why do we have a case (gtpc(4|6))
> > that doesn't include TEID? Do we hash on other fields in this header?
>
> There are many differen GTPv2C messages, most of which contain a TEID.  So it does
> in general still make sense to be able to use RSS for all those other messages.
>
> The CSR (Create Session Request) will not be able to benfit from it, but
> it's just the first message initiating a dialogue between two elements
> (think of it like a TCP SYN).  All the follow-up messages in that
> dialogue contain TEIDs and hence can benefit from RSS.
>
> --
> - Harald Welte <laforge@...monks.org>          https://laforge.gnumonks.org/
> ============================================================================
> "Privacy in residential applications is a desirable marketing option."
>                                                   (ETSI EN 300 175-7 Ch. A6)