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AF_XDP functions was deprecated in libbpf 0.7 and moved to libxdp.
Functions bpf_get/set_link_xdp_id() was deprecated in libbpf 0.8
and replaced with bpf_xdp_query_id() and bpf_xdp_attach/detach().
Updating configuration and source code to accommodate above changes
and allow building OVS with AF_XDP support on newer systems:
- Checking the version of libbpf by detecting availability
of bpf_xdp_detach.
- Checking availability of the libxdp in a system by looking
for a library providing libxdp_strerror(), if libbpf is
newer than 0.6. And checking for xsk.h header provided by
libxdp-dev[el].
- Use xsk.h from libbpf if it is older than 0.7 and not linking
with libxdp in this case as there are known incompatible
versions of libxdp in distributions.
- Check for the NEED_WAKEUP feature replaced with direct checking
in the source code if XDP_USE_NEED_WAKEUP is defined.
- Checking availability of bpf_xdp_query_id and bpf_xdp_detach
and using them instead of deprecated APIs. Fall back to old
functions if not found.
- Dropped LIBBPF_LDADD variable as it makes library and function
detection much harder without providing any actual benefits.
AC_SEARCH_LIBS is used instead and it allows use of AC_CHECK_FUNCS.
- Header includes moved around to files where they are actually used.
- Removed libelf dependency as it is not really used.
With these changes it should be possible to build OVS with either:
- libbpf built from the kernel sources (5.19 or older).
- libbpf < 0.7 provided in distributions.
- libxdp and libbpf >= 0.7 provided in newer distributions.
While it is technically possible to build with libbpf 0.7+ without
libxdp at the moment we're not allowing that for a few reasons.
First, required functions in libbpf are deprecated and can be removed
in future releases. Second, support for all these combinations makes
the detection code fairly complex.
AFAIK, most of the distributions packaging libbpf 0.7+ do package
libxdp as well.
libxdp added as a build dependency for Fedora build since all
supported versions of Fedora are packaging this library.
Acked-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
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The patch introduces experimental AF_XDP support for OVS netdev.
AF_XDP, the Address Family of the eXpress Data Path, is a new Linux socket
type built upon the eBPF and XDP technology. It is aims to have comparable
performance to DPDK but cooperate better with existing kernel's networking
stack. An AF_XDP socket receives and sends packets from an eBPF/XDP program
attached to the netdev, by-passing a couple of Linux kernel's subsystems
As a result, AF_XDP socket shows much better performance than AF_PACKET
For more details about AF_XDP, please see linux kernel's
Documentation/networking/af_xdp.rst. Note that by default, this feature is
not compiled in.
Signed-off-by: William Tu <u9012063@gmail.com>
Signed-off-by: Ilya Maximets <i.maximets@samsung.com>
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