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net: sch_tbf: Add a graft command 

As another qdisc is linked to the TBF, the latter should issue an event to
give drivers a chance to react to the grafting. In other qdiscs, this event
is called GRAFT, so follow suit with TBF as well.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata 2021-10-19 11:07:04 +03:00 committed by David S. Miller
parent aaa5570612
commit 6b3efbfa4e
2 changed files with 18 additions and 0 deletions
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2
include/net/pkt_cls.h
View File

@ -977,6 +977,7 @@ enum tc_tbf_command {
TC_TBF_REPLACE,
TC_TBF_DESTROY,
TC_TBF_STATS,
TC_TBF_GRAFT,
};
struct tc_tbf_qopt_offload_replace_params {
@ -992,6 +993,7 @@ struct tc_tbf_qopt_offload {
union {
struct tc_tbf_qopt_offload_replace_params replace_params;
struct tc_qopt_offload_stats stats;
u32 child_handle;
};
};

16
net/sched/sch_tbf.c
View File

@ -184,6 +184,20 @@ static int tbf_offload_dump(struct Qdisc *sch)
return qdisc_offload_dump_helper(sch, TC_SETUP_QDISC_TBF, &qopt);
}
static void tbf_offload_graft(struct Qdisc *sch, struct Qdisc *new,
struct Qdisc *old, struct netlink_ext_ack *extack)
{
struct tc_tbf_qopt_offload graft_offload = {
.handle = sch->handle,
.parent = sch->parent,
.child_handle = new->handle,
.command = TC_TBF_GRAFT,
};
qdisc_offload_graft_helper(qdisc_dev(sch), sch, new, old,
TC_SETUP_QDISC_TBF, &graft_offload, extack);
}
/* GSO packet is too big, segment it so that tbf can transmit
* each segment in time
*/
@ -547,6 +561,8 @@ static int tbf_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
new = &noop_qdisc;
*old = qdisc_replace(sch, new, &q->qdisc);
tbf_offload_graft(sch, new, *old, extack);
return 0;
}