On Saturday, 16 April 2022 16:21:19 CEST Andrew Lunn wrote:
> This is not an area of the kernel i'm very familiar with. But i'm
> wondering, is this a BATMAN specific problem, or a generic problem?
> Should the fix be in BATMAN, or the core?

I understand what you mean. But let me cite two places which required to 
operate on parts of the frag lists:

	/* If we need update frag list, we are in troubles.
	 * Certainly, it is possible to add an offset to skb data,
	 * but taking into account that pulling is expected to
	 * be very rare operation, it is worth to fight against
	 * further bloating skb head and crucify ourselves here instead.
	 * Pure masohism, indeed. 8)8)
	 */

	/* Misery. We are in troubles, going to mincer fragments... */


And since I cannot reproduce this here at the moment, I've decided not to 
start with that.

Kind regards,
	Sven