Martin KaFai Lau 17bedab272
bpf: xdp: Allow head adjustment in XDP prog ...
This patch allows XDP prog to extend/remove the packet
data at the head (like adding or removing header). It is
done by adding a new XDP helper bpf_xdp_adjust_head().
It also renames bpf_helper_changes_skb_data() to
bpf_helper_changes_pkt_data() to better reflect
that XDP prog does not work on skb.
This patch adds one "xdp_adjust_head" bit to bpf_prog for the
XDP-capable driver to check if the XDP prog requires
bpf_xdp_adjust_head() support. The driver can then decide
to error out during XDP_SETUP_PROG.
Signed-off-by: Martin KaFai Lau <kafai@fb.com >
Acked-by: Daniel Borkmann <daniel@iogearbox.net >
Acked-by: Alexei Starovoitov <ast@kernel.org >
Acked-by: John Fastabend <john.r.fastabend@intel.com >
Signed-off-by: David S. Miller <davem@davemloft.net >
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