netdev - Re: [PATCH net-next v2] ethtool: add netlink based get rxfh support

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Date:   Thu, 10 Nov 2022 17:24:15 -0600
From:   "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     "Mogilappagari, Sudheer" <sudheer.mogilappagari@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "mkubecek@...e.cz" <mkubecek@...e.cz>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "corbet@....net" <corbet@....net>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>
Subject: Re: [PATCH net-next v2] ethtool: add netlink based get rxfh support

On 11/10/2022 4:34 PM, Jakub Kicinski wrote:
> On Thu, 10 Nov 2022 16:08:04 -0600 Samudrala, Sridhar wrote:
>> Can we use QGRP as a prefix to indicate that these are per-queue group parameters
>> and not restricted to RSS related parameters?
>>
>>     QGRP_CONTEXT
>>     QGRP_RSS_HFUNC
>>     QGRP_RSS_KEY
>>     QGRP_RSS_INDIR_TABLE
>>
>> In future, we would like to add per-queue group parameters like
>>     QGRP_INLINE_FLOW_STEERING (Round robin flow steering of TCP flows)
> The RSS context thing is a pretty shallow abstraction, I don't think we
> should be extending it into "queue groups" or whatnot. We'll probably
> need some devlink objects at some point (rate configuration?) and
> locking order is devlink > rtnl, so spawning things from within ethtool
> will be a pain :S

We are going this path of extending ethtool rss context interface to support
per queue-group parameters based on this feedback.
   https://lore.kernel.org/netdev/20220314131114.635d5acb@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com/

Per queue-group rate can already be configured when creating queue groups via
tc-mpqrio interface using bw_rlimit parameters.