how to compile xdp-loader in mips arch? about xdp-tools HOT 6 OPEN

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bofengxiaoshuai @.***> writes:
hello，I want to know how to compile xdp-loader in mips arch? I mean I want to run xdp-loader program in cpu with mips arch，thanks a lot
Well, theoretically, the same way you would compile any other program for that arch. I have no idea if there's anything that will break for such a compile, but if there is, patches are very welcome. However, I'm not sure how useful xdp-loader actually is on MIPS; the kernel support for BPF on that arch is quite limited. Haven't played with it myself, though, so YMMV.

Thank you very much for your answers.
I try to fix it，it's all steps I do，hope you can give me some advise, thanks!

1、I see lines 60-71 of the configure script file:

: ${PKG_CONFIG:=pkg-config}
: ${CC=gcc}
: ${LD=ld}
: ${OBJCOPY=objcopy}
: ${CLANG=clang}
: ${LLC=llc}
: ${M4=m4}
: ${EMACS=emacs}
: ${BPFTOOL=bpftool}
: ${READELF=readelf}
: ${ARCH_INCLUDES=}
: ${ARCH_NAME=}

2、then I modify it to：

: ${PKG_CONFIG:=pkg-config}	
: ${CC=mips64el-linux-gcc}
: ${LD=mips64el-linux-ld}
: ${OBJCOPY=mips64el-linux-objcopy}
: ${CLANG=clang}
: ${LLC=llc}
: ${M4=m4}
: ${EMACS=emacs}
: ${BPFTOOL=bpftool}

3、then ./configure，below is output：

root@ubuntu：~/xdp-tools# ./configure
Found clang binary 'clang' with version 19 (from 'Ubuntu clang version 19.0.0 (++20240222053038+26d71d9ed56c-1~exp1~20240222173217.940)')
/usr/sbin/bpftool
using /usr/lib/linux-tools/5.15.0-67-generic/bpftool v5.15.85
libbpf support： submodule v1.2.0
  perf_buffer__consume support： yes (submodule)
  btf__load_from_kernel_by_id support： yes (submodule)
  btf__type_cnt support： yes (submodule)
  bpf_object__next_map support： yes (submodule)
  bpf_object__next_program support： yes (submodule)
  bpf_program__insn_cnt support： yes (submodule)
  bpf_program__type support： yes (submodule)
  bpf_program__flags support： yes (submodule)
  bpf_program__expected_attach_type support： yes (submodule)
  bpf_map_create support： yes (submodule)
  perf_buffer__new_raw support： yes (submodule)
  bpf_xdp_attach support： yes (submodule)
  bpf_map__set_autocreate support： yes (submodule)
  bpf_prog_test_run_opts support： yes (submodule)
  bpf_xdp_query support： yes (submodule)
zlib support： yes
ELF support： yes
pcap support： yes
secure_getenv support： yes
cap-ng support： no
root@ubuntu:~/xdp-tools# 

4、then I make

root@ubuntu:~/xdp-tools/xdp-loader# make
	CC       xdp-loader
In file included from ../lib/libbpf/src/root/usr/include/bpf/bpf.h：26：0,
				 from xdp-loader.c：11：
../lib/../headers/linux/bpf.h：12：30： fatal error： linux/bpf_common.h： No such file or directory
 #include <linux/bpf_common.h>
							  ^
compilation terminated.
make： *** [../lib/common.mk：107：xdp-loader] 错误 1
root@ubuntu:~/xdp-tools/xdp-loader# 

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You don't need to edit the file, you can just set these when running configure: CC=mips64el-linux-gcc LD=mips64el-linux-ld OBJCOPY=mips64el-linux-objcopy READELF=mips64el-linux-readelf ARCH_NAME=mips ./configure (or export all of them before running configure).

thank you so much for your answer，thanks you for telling me the way to assign the MACRO.
Now I have a question：

 : ${PKG_CONFIG:=pkg-config}
 : ${CC=mips64el-linux-gcc}
 : ${LD=mips64el-linux-ld}
 : ${OBJCOPY=mips64el-linux-objcopy}
 : ${CLANG=clang}
 : ${LLC=llc}
 : ${M4=m4}
 : ${EMACS=emacs}
 : ${BPFTOOL=bpftool}
 : ${READELF=mips64el-linux-readelf}
 : ${ARCH_INCLUDES=}
 : ${ARCH_NAME=mips}`

I want to know which parameter need to assign，
now I have already assigned 4，I don’t know whether it‘s enough.
and if I want to build for mips arch,
what value should assigned for INCLUDES and ARCH_NAME ?

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bofengxiaoshuai @.***> writes:

You don't need to edit the file, you can just set these when running configure: CC=mips64el-linux-gcc LD=mips64el-linux-ld OBJCOPY=mips64el-linux-objcopy READELF=mips64el-linux-readelf ARCH_NAME=mips ./configure (or export all of them before running configure). ------------------------------------------------------------------------------------------------------------ thank you so much for your answer，thanks you for telling me the way to assign the MACRO. Now I have a question： : ${PKG_CONFIG:=pkg-config} : ${CC=mips64el-linux-gcc} : ${LD=mips64el-linux-ld} : ${OBJCOPY=mips64el-linux-objcopy} : ${CLANG=clang} : ${LLC=llc} : ${M4=m4} : ${EMACS=emacs} : ${BPFTOOL=bpftool} : ${READELF=mips64el-linux-readelf} : ${ARCH_INCLUDES=} : ${ARCH_NAME=mips}` I want to know which parameter need to assign， now I have already assigned 4，I don’t know whether it‘s enough. and if I want to build for mips arch, what value should assigned for INCLUDES and ARCH_NAME ?
No idea. I don't actually have much experience cross-compiling for MIPS, so I'm afraid you'll have to find an actual expert to answer this :)

OK，I see， Thank you so much for answer my questions！

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