HWSIM_ATTR_CHANNELS
ret = nla_put_u32(skb, HWSIM_ATTR_CHANNELS, param->channels);
if (info->attrs[HWSIM_ATTR_CHANNELS])
param.channels = nla_get_u32(info->attrs[HWSIM_ATTR_CHANNELS]);
[HWSIM_ATTR_CHANNELS] = { .type = NLA_U32 },