bpf: Support specifying ingress via xdp_md context in BPF_PROG_TEST_RUN

Support specifying the ingress_ifindex and rx_queue_index of xdp_md
contexts for BPF_PROG_TEST_RUN.

The intended use case is to allow testing XDP programs that make decisions
based on the ingress interface or RX queue.

If ingress_ifindex is specified, look up the device by the provided index
in the current namespace and use its xdp_rxq for the xdp_buff. If the
rx_queue_index is out of range, or is non-zero when the ingress_ifindex is
0, return -EINVAL.

Co-developed-by: Cody Haas <[email protected]>
Co-developed-by: Lisa Watanabe <[email protected]>
Signed-off-by: Cody Haas <[email protected]>
Signed-off-by: Lisa Watanabe <[email protected]>
Signed-off-by: Zvi Effron <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Acked-by: Yonghong Song <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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