netdev - Re: [PATCH net-next v3 5/7] net: devmem: add ring parameter filtering

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Message-ID: <CAMArcTX7qP6B7Evjv96kVNq5DFinaDOK=xq7OYXYXbhE+CrdPQ@mail.gmail.com>
Date: Wed, 9 Oct 2024 23:35:19 +0900
From: Taehee Yoo <ap420073@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Mina Almasry <almasrymina@...gle.com>, Brett Creeley <bcreeley@....com>, davem@...emloft.net, 
	pabeni@...hat.com, edumazet@...gle.com, netdev@...r.kernel.org, 
	linux-doc@...r.kernel.org, donald.hunter@...il.com, corbet@....net, 
	michael.chan@...adcom.com, kory.maincent@...tlin.com, andrew@...n.ch, 
	maxime.chevallier@...tlin.com, danieller@...dia.com, hengqi@...ux.alibaba.com, 
	ecree.xilinx@...il.com, przemyslaw.kitszel@...el.com, hkallweit1@...il.com, 
	ahmed.zaki@...el.com, paul.greenwalt@...el.com, rrameshbabu@...dia.com, 
	idosch@...dia.com, asml.silence@...il.com, kaiyuanz@...gle.com, 
	willemb@...gle.com, aleksander.lobakin@...el.com, dw@...idwei.uk, 
	sridhar.samudrala@...el.com
Subject: Re: [PATCH net-next v3 5/7] net: devmem: add ring parameter filtering

On Wed, Oct 9, 2024 at 4:28 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Thu, 3 Oct 2024 11:49:50 -0700 Mina Almasry wrote:
> > > > +       dev->ethtool_ops->get_ringparam(dev, &ringparam,
> > > > +                                       &kernel_ringparam, extack);
> > > > +       if (kernel_ringparam.tcp_data_split != ETHTOOL_TCP_DATA_SPLIT_ENABLED ||
> > > > +           kernel_ringparam.tcp_data_split_thresh) {
> > > > +               NL_SET_ERR_MSG(extack,
> > > > +                              "tcp-header-data-split is disabled or threshold is not zero");
> > > > +               return -EINVAL;
> > > > +       }
> > > > +
> > > Maybe just my personal opinion, but IMHO these checks should be separate
> > > so the error message can be more concise/clear.
> > >
> >
> > Good point. The error message in itself is valuable.
>
> If you mean that the error message is more intuitive than debugging why
> PP_FLAG_ALLOW_UNREADABLE_NETMEM isn't set - I agree :)
>
> I vote to keep the patch, FWIW. Maybe add a comment that for now drivers
> should not set PP_FLAG_ALLOW_UNREADABLE_NETMEM, anyway, but this gives
> us better debuggability, and in the future we may find cases where
> doing a copy is cheaper than buffer circulation (and therefore may lift
> this check).

Okay, I will not drop this patch in v4 patch.
So, I just will fix what Brett and Mina pointed out.