Ariane Keller wrote:
That sounds like it would also be possible using rtnetlink. You could
send out a notification whenever you switch the active buffer and have
userspace listen to these and replace the inactive one.
I guess using rtnetlink is possible. However I'm not sure about how to
implement it:
The first thought was to use RTM_NEWQDISC to send the data to the
netem_change() function (similar to tc_qdisc_modify() ).
That sounds reasonable.
But with this
we would need the tcm_handle, tcm_parent arguments etc. which are not
known in q_netem.c
Therefore we would have to change the parse_qopt() function prototype in
order to pass the whole "req" and not only the nlmsghdr.
I assume you mean netem_init, parse_qopt is userspace. But I don't
see how that is related, emptying the buffer happens during packet
processing, right?
I guess I would simply change the qdisc_notify function to not
require a struct nlmsghdr * (simply pass nlmsg_seq directly) and
use that to send notifications. The netem dump function would
add the buffer state. BTW, the parent class id is available in
sch->parent, the handle in sch->handle, but qdisc_notify should
take care of everything you need.
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