Merge the pping_kern_tc.c, pping_kern_xdp.c and pping_helpers.h into
the single file pping_kern.c. Do not change any of the BPF code,
except renaming the map ts_start to packet_ts.
To handle both BPF programs kept in single ELF-file, change loading
mechanism to extract and attach both tc and XDP programs from it. Also
refactor main-method into several smaller functions to reduce its
size.
Finally, added the --force (-f) and --cleanup-interval (-c) options to
the argument parsing, and improved the parsing of the
--rate-limit (-r) option.
NOTE: The verifier rejects program in it's current state as too
large (over 1 million instructions). Setting the TCP_MAX_OPTIONS in
pping_kern.c to 5 (or less) solves this. Unsure at the moment what
causes the verifier to think the program is so large, as the code in
pping_kern.c is identical to the one from the three files it was
merged from.
Signed-off-by: Simon Sundberg <simon.sundberg@kau.se>
Load and pin the tc-bpf program in pping.c using libbpf, and only
attach the pinned program using iproute. That way, can use features
that are not supported by the old iproute loader, even if iproute does
not have libbpf support.
To support this change, extend bpf_egress_loader with option to load
pinned program. Additionally, remove configure script and parts of
Makefile that are no longer needed. Furthermore, remove multiple
definitions of ts_start map, and place singular definition in
pping_helpers.h which is included by both BPF programs.
Also, some minor fixes based on Toke's review.
Signed-off-by: Simon Sundberg <simon.sundberg@kau.se>
Perform various fixes and tweaks:
- Rename several defines to make them more informative
- Remove unrolling of loop in BPF programs
- Reuse defines for program sections between userspace and kernel
space programs
- Perform fork+exec to run bpf_egress_loader script instead of
system()
- Add comment to copied scripts indicating I've modified them
- Add pping.h and pping_helpers.h as dependencies in Makefile
Also, add a brief description of what PPing is and how it works to
README
Signed-off-by: Simon Sundberg <simon.sundberg@kau.se>
Copy setup from traffic-pacing-edt to use BTF-defined map if configure
detects that iproute2 has libbpf support, otherwise fall back on
bpf_elf_map. Also fix a minor bug with setting default value for SEC
in bpf_egress_loader.sh.
Signed-off-by: Simon Sundberg <simon.sundberg@kau.se>
Split and rename files so there is one userspace program (pping) and
two kernel-space ones (one for XDP and one for TC-BPF).
Copy the shell script for loading the TC-BPF program from
traffic-pacing-edt folder, but add support for loading a specific
section.
The XDP and TC-BPF programs do not share the ts_start map, so program
does not work.
Signed-off-by: Simon Sundberg <simon.sundberg@kau.se>
The XDP program pushes the calculated RTTs to userspace through the
perf-buffer and the userspace program polls it to print them out
Signed-off-by: Simon Sundberg <simon.sundberg@kau.se>
