netdev - Re: [Intel-wired-lan] [PATCH net-next v5] ethtool: ice: Support for RSS settings to GTP from ethtool

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Date: Wed, 31 Jan 2024 12:53:24 +0100
From: Marcin Szycik <marcin.szycik@...ux.intel.com>
To: Takeru Hayasaka <hayatake396@...il.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>
Cc: linux-doc@...r.kernel.org, vladimir.oltean@....com,
 linux-kernel@...r.kernel.org, laforge@...monks.org,
 intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
 mailhol.vincent@...adoo.fr
Subject: Re: [Intel-wired-lan] [PATCH net-next v5] ethtool: ice: Support for
 RSS settings to GTP from ethtool



On 31.01.2024 02:37, Takeru Hayasaka wrote:
> This is a patch that enables RSS functionality for GTP packets using ethtool.
> 
> A user can include TEID and make RSS work for GTP-U over IPv4 by doing the
> following:`ethtool -N ens3 rx-flow-hash gtpu4 sde`
> 
> In addition to gtpu(4|6), we now support gtpc(4|6),gtpc(4|6)t,gtpu(4|6)e,
> gtpu(4|6)u, and gtpu(4|6)d.
> 
> gtpc(4|6): Used for GTP-C in IPv4 and IPv6, where the GTP header format does
> not include a TEID.
> gtpc(4|6)t: Used for GTP-C in IPv4 and IPv6, with a GTP header format that
> includes a TEID.
> gtpu(4|6): Used for GTP-U in both IPv4 and IPv6 scenarios.
> gtpu(4|6)e: Used for GTP-U with extended headers in both IPv4 and IPv6.
> gtpu(4|6)u: Used when the PSC (PDU session container) in the GTP-U extended
> header includes Uplink, applicable to both IPv4 and IPv6.
> gtpu(4|6)d: Used when the PSC in the GTP-U extended header includes Downlink,
> for both IPv4 and IPv6.
> 
> GTP generates a flow that includes an ID called TEID to identify the tunnel.
> This tunnel is created for each UE (User Equipment).By performing RSS based on
> this flow, it is possible to apply RSS for each communication unit from the UE.
> Without this, RSS would only be effective within the range of IP addresses. For
> instance, the PGW can only perform RSS within the IP range of the SGW.
> Problematic from a load distribution perspective, especially if there's a bias
> in the terminals connected to a particular base station.This case can be
> solved by using this patch.

LGTM
Reviewed-by: Marcin Szycik <marcin.szycik@...ux.intel.com>

> Signed-off-by: Takeru Hayasaka <hayatake396@...il.com>
> ---
> v2->v3: Based on Harald-san's review, I added documentation and comments to 
> ethtool.h and ice.rst.
> v3->v4: Based on Marcin-san's review, I added the missing code for GTPC and 
> GTPC_TEID, and revised the documentation and comments.
> v4->v5: Based on Marcin-san's review, I fixed rename and wrong code regarding
> GTPC

[...]

>      f     Hash on bytes 0 and 1 of the Layer 4 header of the Rx packet.
>      n     Hash on bytes 2 and 3 of the Layer 4 header of the Rx packet.
> -

Still removing this line :c

> +    e     Hash on GTP Packet on TEID (4bytes) of the Rx packet.
>  
>  Accelerated Receive Flow Steering (aRFS)
>  ----------------------------------------

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