netdev - Re: [PATCH 2/5] rust: add support for ethernet operations

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Date: Thu, 15 Jun 2023 15:44:30 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Benno Lossin <benno.lossin@...ton.me>
Cc: FUJITA Tomonori <fujita.tomonori@...il.com>, netdev@...r.kernel.org,
	rust-for-linux@...r.kernel.org, aliceryhl@...gle.com,
	miguel.ojeda.sandonis@...il.com
Subject: Re: [PATCH 2/5] rust: add support for ethernet operations

> > +    /// Sets `ethtool_ops` of `net_device`.
> > +    pub fn set_ether_operations<U>(&mut self) -> Result
> > +    where
> > +        U: EtherOperations<D>,
> > +    {
> > +        if self.is_registered {
> > +            return Err(code::EINVAL);
> > +        }
> > +        EtherOperationsAdapter::<U, D>::new().set_ether_ops(&mut self.dev);
> > +        Ok(())
> > +    }
> 
> Is it really necessary for a device to be able to have multiple different
> `EtherOperations`? Couldnt you also just make `T` implement 
> `EtherOperations<D>`?

For 99% of drivers, netdev->ethtool_ops is set once before
register_netdev() is called and never changed.

There is one corner case i know of, and it is a hack:

https://elixir.bootlin.com/linux/v6.4-rc6/source/net/dsa/master.c#L223

Since this is a hack, you can probably skip it in rust. 

      Andrew