openSUSE package xdp dependency

[ManickaP]

OS: openSUSE Leap 15.6
libmsquic-2.4.16 requires libxdp >= 1.4.0,
openSUSE Leap 15.6 only provides libxdp1 version 1.3.1.

Context: dotnet/dotnet-buildtools-prereqs-docker#1536

[guhetier]

@mtfriesen Do you know if MsQuic needs libxdp >= 1.4.0 or if the dependency required is too strong?

[mtfriesen]

I don't think MsQuic needs (or at least, should need) libxdp at all. It should be an optional acceleration; I'm also not sure XDP support is even included in the MsQuic official builds.

However, my experience is limited to XDP on Windows.

Let me dig around a bit.

[mtfriesen]

It looks like official 24.04 builds do link to libxdp on x64. From the import table, I think the effective dependency is >= 1.2?

Separately, IMO MsQuic should not require XDP at all - just try runtime loading the libxdp.so file.

nm -gD /lib/x86_64-linux-gnu/libmsquic.so.2 | grep LIBXDP
                 U libxdp_get_error@LIBXDP_1.0.0
                 U libxdp_set_print@LIBXDP_1.0.0
                 U libxdp_strerror@LIBXDP_1.0.0
                 U xdp_multiprog__close@LIBXDP_1.0.0
                 U xdp_multiprog__detach@LIBXDP_1.0.0
                 U xdp_multiprog__get_from_ifindex@LIBXDP_1.0.0
                 U xdp_program__attach@LIBXDP_1.0.0
                 U xdp_program__bpf_obj@LIBXDP_1.0.0
                 U xdp_program__close@LIBXDP_1.0.0
                 U xdp_program__open_file@LIBXDP_1.0.0
                 U xsk_socket__create@LIBXDP_1.2.0
                 U xsk_socket__delete@LIBXDP_1.2.0
                 U xsk_socket__fd@LIBXDP_1.2.0
                 U xsk_socket__update_xskmap@LIBXDP_1.2.0
                 U xsk_umem__create@LIBXDP_1.2.0
                 U xsk_umem__delete@LIBXDP_1.2.0

[guhetier]

Unless we can identify a need, we should remove XDP support from the Linux package.

• XDP support on Linux is a recent addition that wasn't part of older packages
• There is no clearly identified need for it as of now

A longer-term solution would be to load libxdp.so at runtime as mentioned above, which can be done if/when there is a need.