Re: Porting RT net driver to dovetail

[Philippe Gerum <rpm@xenomai.org>]

François Legal <devel@thom.fr.eu.org> writes:

> Thanks for the clarification.
>
> I'm not sure I understand the sentence "ATM, we only have a real-time capable raw socket interface".

See https://source.denx.de/Xenomai/xenomai4/libevl/-/blob/master/tidbits/oob-net-icmp.c?ref_type=heads

> In my application, we only use RTNET for level 2 communication. Is this already available.
>
> And so, back to the original question, how do I transition from an RTNET/RTDM NIC to an EVL/??? one ?
>

When the upcoming EVL netstack is fully available (i.e. including the
driver<->evl interface along with the UDP layer), you will add
out-of-band support code to the vanilla driver directly. Typically, a
couple of handlers added to struct net_device_ops, such as:

#ifdef CONFIG_NET_OOB
	int			(*ndo_enable_oob)(struct net_device *dev);
	void			(*ndo_disable_oob)(struct net_device *dev);
	struct sk_buff *	(*ndo_alloc_tx_oob)(struct net_device *ndev);
#endif

The idea is to reuse the vanilla infrastructure as much as possible
instead of forking the driver code. There are a few techniques to have
in mind for doing so while preventing too many merge conflicts whenever
the upstream code changes, the netstack will come with the FEC driver
adapted that way as an illustration.

ETA: end of july.

-- 
Philippe.