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Tsirkin" , Andrew Melnychenko , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= Subject: [PATCH v2 0/7] Report fatal errors from failure with pre-opened eBPF RSS FDs Date: Thu, 5 Sep 2024 19:13:23 +0100 Message-ID: <20240905181330.3657590-1-berrange@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 11 X-Spam_score: 1.1 X-Spam_bar: + X-Spam_report: (1.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.142, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_SBL_CSS=3.335, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org 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. Changed in v2: - Split 'ebpf_error' probe into multiple probes Daniel P. Berrangé (7): hw/net: fix typo s/epbf/ebpf/ in virtio-net ebpf: drop redundant parameter checks in static methods ebpf: improve error trace events 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 hw/net: improve tracing of eBPF RSS setup ebpf/ebpf_rss.c | 118 ++++++++++++++++++++++++++++---------------- ebpf/ebpf_rss.h | 10 ++-- ebpf/trace-events | 8 ++- hw/net/trace-events | 8 +-- hw/net/virtio-net.c | 63 +++++++++++++++-------- 5 files changed, 137 insertions(+), 70 deletions(-) Reviewed-by: Michael S. Tsirkin