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GenerateTraffic was added to spin up long-running iperf3 load, mainly to drive high PPS background traffic. It was never meant to provide stable throughput numbers, and trying to repurpose it for measurement does not make sense. Introduce Iperf3Runner to allow tests to split out server/client configuration, control start/stop, and collect JSON output for analysis. This makes it possible to measure bandwidth directly when validating egress shaping. GenerateTraffic stays as the background load generator, reusing the common iperf3 helpers under the hood. Signed-off-by: Carolina Jubran <cjubran@nvidia.com> Reviewed-by: Cosmin Ratiu <cratiu@nvidia.com> Reviewed-by: Nimrod Oren <noren@nvidia.com> Link: https://patch.msgid.link/20251130091938.4109055-3-cjubran@nvidia.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>