linux-kernel - Re: [PATCH 4/4] drivers: net: mediatek: initial implementation of ccmni

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Date:   Thu, 24 Jun 2021 23:55:02 +0800
From:   Rocco Yue <rocco.yue@...iatek.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>, <netdev@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <bpf@...r.kernel.org>,
        <wsd_upstream@...iatek.com>, <chao.song@...iatek.com>,
        <kuohong.wang@...iatek.com>, Rocco Yue <rocco.yue@...iatek.com>
Subject: Re: [PATCH 4/4] drivers: net: mediatek: initial implementation of ccmni

On Thu, 2021-06-24 at 14:23 +0200, Greg KH wrote:
On Thu, Jun 24, 2021 at 07:53:49PM +0800, Rocco Yue wrote:
>> 
>> without MTK ap ccci driver (modem driver), ccmni_rx_push() and
>> ccmni_hif_hook() are not be used.
>> 
>> Both of them are exported as symbols because MTK ap ccci driver
>> will be compiled to the ccci.ko file.
> 
> But I do not see any code in this series that use these symbols.  We can

will delete these symbols.

> not have exports that no one uses.  Please add the driver to this patch
> series when you resend it.
> 

I've just took a look at what the Linux staging tree is. It looks like
a good choice for the current ccmni driver.

honstly, If I simply upload the relevant driver code B that calls
A (e.g. ccmni_rx_push), there is still a lack of code to call B.
This seems to be a continuty problem, unless all drivers codes are
uploaded (e.g. power on modem, get hardware status, complete tx/rx flow).

>> In addition, the code of MTK's modem driver is a bit complicated,
>> because this part has more than 30,000 lines of code and contains
>> more than 10 modules. We are completeing the upload of this huge
>> code step by step. Our original intention was to upload the ccmni
>> driver that directly interacts with the kernel first, and then
>> complete the code from ccmni to the bottom layer one by one from
>> top to bottom. We expect the completion period to be about 1 year.
> 
> Again, we can not add code to the kernel that is not used, sorry.  That
> would not make any sense, would you want to maintain such a thing?
> 
> And 30k of code seems a bit excesive for a modem driver.   Vendors find
> that when they submit code for inclusion in the kernel tree, in the end,
> they end up 1/3 the original size, so 10k is reasonable.
> 
> I can also take any drivers today into the drivers/staging/ tree, and
> you can do the cleanups there as well as getting help from others.
> 
> 1 year seems like a long time to do "cleanup", good luck!
> 

Thanks~

Can I resend patch set as follows:
(1) supplement the details of pureip for patch 1/4;
(2) the document of ccmni.rst still live in the Documentation/...
(3) modify ccmni and move it into the drivers/staging/...

>>> +++ b/drivers/net/ethernet/mediatek/ccmni/ccmni.h
>>> 
>>> Why do you have a .h file for a single .c file?  that shouldn't be
>>> needed.
>> 
>> I add a .h file to facilitate subsequent code expansion. If it's
>> not appropriate to do this here, I can add the content of .h into
>> .c file.
> 
> If nothing other than a single .c file needs it, put it into that .c
> file please.

will do.

Thanks,
Rocco