rdma/mlx5_dv: force RoCE IPv4 TOS 96 on RTR regardless of SL - #6
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Inferring traffic_class from ah_attr.sl was a no-op: mlx5_dv RTR AVs keep sl=0 while rdma_set_option only programs the SQ. Stamp TOS 96 / SL 3 (CS3) whenever IBV_QP_AV is present, and log the AV so a canary IM roll can prove the helper fired. Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
traffic_classfromah_attr.sl. mlx5_dv RTR AVs keep sl=0 whilerdma_set_option(TOS)only programs the SQ, so the helper was a no-op and switch Q3 stayed frozen.IBV_QP_AVis present, force TOS 96 / SL 3 (CS3 / DSCP 24), matchingdataEngineRdmaPriorityClass v2=3. Do not addIBV_QP_AVif the kernel did not already supply a full AV.is_globalso a canary IM roll can prove the helper fired.Test plan
v26.05.0+linkpool.5, pin dep-versions, build IMv1.13.0-reset.14RoCE RTR TOS 96xe-1/1/5Q3 increments with ma5-11 writes; if not, check uplinks /xe-1/1/7(EVPN VXLAN)Made with Cursor