ib_flow_spec_ib
ib_spec.size = sizeof(struct ib_flow_spec_ib);
struct ib_flow_spec_ib *ib_spec;
sizeof(struct ib_flow_spec_ib);
ib_spec = (struct ib_flow_spec_ib *)(flow + 1);
ib_spec->size = sizeof(struct ib_flow_spec_ib);
struct ib_flow_spec_ib ib;