netdev - Re: [PATCH bpf RFC 1/4] xdp: rss hash types representation

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Date:   Wed, 29 Mar 2023 09:10:55 +0100
From:   Edward Cree <ecree.xilinx@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>, bpf@...r.kernel.org
Cc:     netdev@...r.kernel.org, Stanislav Fomichev <sdf@...gle.com>,
        martin.lau@...nel.org, ast@...nel.org, daniel@...earbox.net,
        alexandr.lobakin@...el.com, larysa.zaremba@...el.com,
        xdp-hints@...-project.net, anthony.l.nguyen@...el.com,
        yoong.siang.song@...el.com, boon.leong.ong@...el.com,
        intel-wired-lan@...ts.osuosl.org, pabeni@...hat.com,
        jesse.brandeburg@...el.com, kuba@...nel.org, edumazet@...gle.com,
        john.fastabend@...il.com, hawk@...nel.org, davem@...emloft.net
Subject: Re: [PATCH bpf RFC 1/4] xdp: rss hash types representation

On 28/03/2023 21:15, Jesper Dangaard Brouer wrote:
> Hardware RSS types are differently encoded for each hardware NIC. Most
> hardware represent RSS hash type as a number. Determining L3 vs L4 often
> requires a mapping table as there often isn't a pattern or sorting
> according to ISO layer.
> 
> The patch introduce a XDP RSS hash type (xdp_rss_hash_type) that can both
> be seen as a number that is ordered according by ISO layer, and can be bit
> masked to separate IPv4 and IPv6 types for L4 protocols. Room is available
> for extending later while keeping these properties. This maps and unifies
> difference to hardware specific hashes.

Would it be better to make use of the ETHTOOL_GRXFH defines (stuff
 like UDP_V6_FLOW, RXH_L4_B_0_1 etc.)?  Seems like that could allow
 for some code reuse in drivers.