Hi,
Cong Wang <xiyou.wangc...@gmail.com> writes:
> On Tue, Sep 26, 2017 at 4:39 PM, Vinicius Costa Gomes
> <vinicius.go...@intel.com> wrote:
>> +static int cbs_init(struct Qdisc *sch, struct nlattr *opt)
>> +{
>> + struct cbs_sched_data *q = qdisc_priv(sch);
>> + struct net_device *dev = qdisc_dev(sch);
>> +
>> + if (!opt)
>> + return -EINVAL;
>> +
>> + /* FIXME: this means that we can only install this qdisc
>> + * "under" mqprio. Do we need a more generic way to retrieve
>> + * the queue, or do we pass the netdev_queue to the driver?
>> + */
>> + q->queue = TC_H_MIN(sch->parent) - 1 - netdev_get_num_tc(dev);
>> +
>> + return cbs_change(sch, opt);
>> +}
>
> Yeah it is ugly to assume its parent is mqprio, at least you should
> error out if it is not the case.
Will add an error for this, for now.
>
> I am not sure how we can solve this elegantly, perhaps you should
> extend mqprio rather than add a new one?
Is the alternative hinted in the FIXME worse? Instead of passing the
index of the hardware queue to the driver we pass the pointer to a
netdev_queue to the driver and it "discovers" the HW queue from that.
Cheers,
--
Vinicius
