This is an RFC for an alternative way to capture packets from a DPDK application. I did brief demo of similar mechanism at DPDK summit but this is more complete. Capture runs in the primary process and is driven entirely over telemetry; no secondary process is involved.
A client asks the application to start capturing and passes it a file descriptor to write to. The application writes pcapng to that descriptor. A Wireshark extcap script is the intended front end, but the control path is just telemetry and the output is just a pipe, so other front ends are possible. 1/4 telemetry: let a command receive file descriptors from the client 2/4 capture: the library 3/4 test: functional test 4/4 app: the Wireshark extcap script and its documentation Setup and usage are in doc/guides/tools/wireshark_extcap.rst. Primary process only for now; secondary-process capture is possible as follow-on. Posting as RFC to get feedback on the approach. The extcap script is dual licensed (BSD-3-Clause OR GPL-2.0-or-later) as it may be more useful in the Wireshark tree. Stephen Hemminger (4): telemetry: allow commands to receive file descriptors capture: infrastructure wireshark packet capture test: add test for capture hooks usertools/dpdk-wireshark-extcap.py: script for external capture MAINTAINERS | 4 + app/test/meson.build | 1 + app/test/test_capture.c | 365 +++++++++++ doc/guides/rel_notes/release_26_07.rst | 12 + doc/guides/tools/index.rst | 1 + doc/guides/tools/wireshark_extcap.rst | 155 +++++ lib/capture/capture.c | 821 +++++++++++++++++++++++++ lib/capture/capture_impl.h | 56 ++ lib/capture/filter.c | 108 ++++ lib/capture/meson.build | 19 + lib/meson.build | 1 + lib/telemetry/rte_telemetry.h | 66 ++ lib/telemetry/telemetry.c | 115 +++- usertools/dpdk-wireshark-extcap.py | 274 +++++++++ 14 files changed, 1986 insertions(+), 12 deletions(-) create mode 100644 app/test/test_capture.c create mode 100644 doc/guides/tools/wireshark_extcap.rst create mode 100644 lib/capture/capture.c create mode 100644 lib/capture/capture_impl.h create mode 100644 lib/capture/filter.c create mode 100644 lib/capture/meson.build create mode 100755 usertools/dpdk-wireshark-extcap.py -- 2.53.0
