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Enable xdp-loader to attach multiple XDP programs to a single interface by backporting the BPF trampoline implementation from Linux kernel 6.17 to 6.12 for LoongArch64. The xdp-loader utility relies on libxdp, which in turn requires kernel support for BPF trampoline. While x86_64 and other architectures have this feature, LoongArch64 only gained it in kernel 6.17. Without this backport, xdp-loader fails on LoongArch64 systems running kernel 6.12. Changes backported include: - BPF trampoline infrastructure for LoongArch64 - Necessary JIT compiler updates - Related BPF subsystem changes This allows full compatibility with the xdp-tools ecosystem on LoongArch64 systems running older kernel versions. Reference: https://github.com/xdp-project/xdp-tools/tree/main/lib/libxdp Signed-off-by: Vincent Li <vincent.mc.li@gmail.com> Link: https://github.com/openwrt/openwrt/pull/21077 Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>