[0/5] Report fatal errors from failure with pre-opened eBPF RSS FDs

Message

Daniel P. Berrangé Aug. 6, 2024, 2:56 p.m. UTC

The virtio-net code for eBPF RSS is still ignoring errors when
failing to load the eBPF RSS program passed in by the mgmt app
via pre-opened FDs.

This series re-factors the eBPF common code so that it actually
reports using "Error" objects. Then it makes virtio-net treat
a failure to load pre-opened FDs as a fatal problem. When doing
speculative opening of eBPF FDs, QEMU merely prints a warning,
and allows the software fallback to continue.

Trace event coverage is significantly expanded to make this all
much more debuggable too.

Daniel P. Berrangé (5):
  hw/net: fix typo s/epbf/ebpf/ in virtio-net
  ebpf: drop redundant parameter checks in static methods
  ebpf: add formal error reporting to all APIs
  hw/net: report errors from failing to use eBPF RSS FDs
  ebpf: improve trace event coverage to all key operations

 ebpf/ebpf_rss.c     | 118 ++++++++++++++++++++++++++++----------------
 ebpf/ebpf_rss.h     |  10 ++--
 ebpf/trace-events   |   6 ++-
 hw/net/virtio-net.c |  53 +++++++++++++-------
 4 files changed, 123 insertions(+), 64 deletions(-)