netdev - Re: [PATCH net-next v2 3/6] net: lan966x: add port module support

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Message-ID: <20211126091221.tzrqsgawavlzitp5@soft-dev3-1.localhost>
Date:   Fri, 26 Nov 2021 10:12:21 +0100
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     <davem@...emloft.net>, <kuba@...nel.org>, <robh+dt@...nel.org>,
        <UNGLinuxDriver@...rochip.com>, <p.zabel@...gutronix.de>,
        <linux@...linux.org.uk>, <netdev@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v2 3/6] net: lan966x: add port module support

The 11/25/2021 15:59, Andrew Lunn wrote:

Hi Andrew,

> 
> > If I undestood you correctly I have tried to do the following:
> >
> > struct lan966x_ifh {
> >     __be32 timestamp;
> >     __be32 bypass : 1;
> >     __be32 port : 3;
> >     ...
> > };
> >
> > But then I start to get errors from sparse:
> >
> > error: invalid bitfield specifier for type restricted __be32.
> 
> Maybe look at struct iphdr. It has bitfields for the header length and
> the IP version.

I think it would get pretty messy to add all these defines in the
lan966x_ifh struct. One reason is that the IFH contains 38 fields.

I have send another version(v4) where I think I have simplified it a little
bit more. If you think is still not clear enough, I will try again the
approach that you proposed.

> 
>     Andrew

-- 
/Horatiu