netdev - Re: [PATCH net-next v12 2/4] ethtool: provide customized dim profile management

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Date: Wed, 8 May 2024 21:26:46 +0800
From: Heng Qi <hengqi@...ux.alibaba.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org,
 virtualization@...ts.linux.dev,
 "David S .  Miller" <davem@...emloft.net>,
 Paolo Abeni <pabeni@...hat.com>,
 Eric  Dumazet <edumazet@...gle.com>,
 Jason Wang <jasowang@...hat.com>,
 "Michael S  . Tsirkin" <mst@...hat.com>,
 Brett Creeley <bcreeley@....com>,
 Ratheesh  Kannoth <rkannoth@...vell.com>,
 Alexander Lobakin <aleksander.lobakin@...el.com>,
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
 Tal  Gilboa <talgi@...dia.com>,
 Jonathan Corbet <corbet@....net>,
 linux-doc@...r.kernel.org,
 Maxime Chevallier <maxime.chevallier@...tlin.com>,
 Jiri Pirko <jiri@...nulli.us>,
 Paul  Greenwalt <paul.greenwalt@...el.com>,
 Ahmed Zaki <ahmed.zaki@...el.com>,
 Vladimir Oltean <vladimir.oltean@....com>,
 Kory Maincent <kory.maincent@...tlin.com>,
 Andrew Lunn <andrew@...n.ch>,
 justinstitt@...gle.com,
 Simon Horman <horms@...nel.org>
Subject: Re: [PATCH net-next v12 2/4] ethtool: provide customized dim profile management

On Tue, 7 May 2024 19:57:52 -0700, Jakub Kicinski <kuba@...nel.org> wrote:
> On Sat,  4 May 2024 14:44:45 +0800 Heng Qi wrote:
> > @@ -1325,6 +1354,8 @@ operations:
> >              - tx-aggr-max-bytes
> >              - tx-aggr-max-frames
> >              - tx-aggr-time-usecs
> > +            - rx-profile
> > +            - tx-profil
> >        dump: *coalesce-get-op
> >      -
> >        name: coalesce-set
> 
> set probably needs to get the new attributes, too?

I looked at other similar use cases (such as wol, debug) and it doesn't
seem to be needed?

> 
> > +static int ethnl_update_profile(struct net_device *dev,
> > +				struct dim_cq_moder __rcu **dst,
> > +				const struct nlattr *nests,
> > +				struct netlink_ext_ack *extack)
> 
> > +	rcu_assign_pointer(*dst, new_profile);
> > +	kfree_rcu(old_profile, rcu);
> > +
> > +	return 0;
> 
> Don't we need to inform DIM somehow that profile has switched
> and it should restart itself?

When the profile is modified, dim itself is a dynamic adjustment mechanism
and will quickly adjust to the appropriate value according to the new profile.
This is also seen in practice.

Thanks!