HWSIM_ATTR_SIGNAL
!info->attrs[HWSIM_ATTR_SIGNAL] ||
txi->status.ack_signal = nla_get_u32(info->attrs[HWSIM_ATTR_SIGNAL]);
!info->attrs[HWSIM_ATTR_SIGNAL])
rx_status.signal = nla_get_u32(info->attrs[HWSIM_ATTR_SIGNAL]);
[HWSIM_ATTR_SIGNAL] = { .type = NLA_U32 },