Add ability to specify a network interface used to resolve XDP hints
kfuncs when loading program through bpftool.
Usage:
bpftool prog load [...] xdpmeta_dev <ifname>
Writing just 'dev <ifname>' instead of 'xdpmeta_dev' is a very probable
mistake that results in not very descriptive errors,
so 'bpftool prog load [...] dev <ifname>' syntax becomes deprecated,
followed by 'bpftool map create [...] dev <ifname>' for consistency.
Now, to offload program, execute:
bpftool prog load [...] offload_dev <ifname>
To offload map:
bpftool map create [...] offload_dev <ifname>
'dev <ifname>' still performs offloading in the commands above, but now
triggers a warning and is excluded from bash completion.
'xdpmeta_dev' and 'offload_dev' are mutually exclusive options, because
'xdpmeta_dev' basically makes a program device-bound without loading it
onto the said device. For now, offloaded programs cannot use XDP hints [0],
but if this changes, using 'offload_dev <ifname>' should cover this case.
[0] https://lore.kernel.org/bpf/a5a636cc-5b03-686f-4be0-000383b05cfc@linux.dev
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20230517160103.1088185-1-larysa.zaremba@intel.com
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