On Wed, 21 Nov 2018 11:01:45 +0100
Pavel Popa <pashinho1990@xxxxxxxxx> wrote:
> For what I see, the only way to return -EFAULT is in this case
> https://elixir.bootlin.com/linux/v4.18.10/source/net/core/filter.c#L3259.
> This may explain the "to_ifindex=0" thing, as 'fwd' is initialized
> NULL. But I don't understand the meaning of the
> "xdp_map_invalid(xdp_prog, map_owner)" condition. So, if that's really
> the case, what can be inferred from this?
Are you using BPF-tail calls?
Well that code got removed in kernel 4.19:
Commit f6069b9aa993 ("bpf: fix redirect to map under tail calls")
https://git.kernel.org/torvalds/c/f6069b9aa993
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer
$ git describe --contains f6069b9aa993
v4.19-rc1~86^2~6^2
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