[PATCH net-next 07/13] net: sched: red: offload a graft notification

[Jakub Kicinski <jakub.kicinski@netronome.com>]

Drivers offloading Qdiscs should have reasonable certainty
the offloaded behaviour matches the SW path.  This is impossible
if the driver does not know about all Qdiscs or when Qdiscs move
and are reused.  Send a graft notification from RED.  The drivers
are expected to simply stop offloading the Qdisc, if a non-standard
child is ever grafted onto it.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: John Hurley <john.hurley@netronome.com>
---
 include/net/pkt_cls.h |  2 ++
 net/sched/sch_red.c   | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index fa31d034231d..01f2802b7aee 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -834,6 +834,7 @@ enum tc_red_command {
 	TC_RED_DESTROY,
 	TC_RED_STATS,
 	TC_RED_XSTATS,
+	TC_RED_GRAFT,
 };
 
 struct tc_red_qopt_offload_params {
@@ -853,6 +854,7 @@ struct tc_red_qopt_offload {
 		struct tc_red_qopt_offload_params set;
 		struct tc_qopt_offload_stats stats;
 		struct red_stats *xstats;
+		u32 child_handle;
 	};
 };
 
diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index a1d08bdd9357..4b5ca172ee2d 100644
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -367,6 +367,21 @@ static int red_dump_class(struct Qdisc *sch, unsigned long cl,
 	return 0;
 }
 
+static void red_graft_offload(struct Qdisc *sch,
+			      struct Qdisc *new, struct Qdisc *old,
+			      struct netlink_ext_ack *extack)
+{
+	struct tc_red_qopt_offload graft_offload = {
+		.handle		= sch->handle,
+		.parent		= sch->parent,
+		.child_handle	= new->handle,
+		.command	= TC_RED_GRAFT,
+	};
+
+	qdisc_offload_graft_helper(qdisc_dev(sch), sch, new, old,
+				   TC_SETUP_QDISC_RED, &graft_offload, extack);
+}
+
 static int red_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
 		     struct Qdisc **old, struct netlink_ext_ack *extack)
 {
@@ -376,6 +391,8 @@ static int red_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
 		new = &noop_qdisc;
 
 	*old = qdisc_replace(sch, new, &q->qdisc);
+
+	red_graft_offload(sch, new, *old, extack);
 	return 0;
 }
 
-- 
2.17.1