Re: [net-next PATCH 3/7] net: sched: add cls_u32 offload hooks for netdevs

This patch allows netdev drivers to consume cls_u32 offloads via
the ndo_setup_tc ndo op.

This works aligns with how network drivers have been doing qdisc
offloads for mqprio.

Signed-off-by: John Fastabend <redacted>
---
 include/linux/netdevice.h |    6 +++-
 include/net/pkt_cls.h     |   33 ++++++++++++++++++++
 net/sched/cls_u32.c       |   73 ++++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 109 insertions(+), 3 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 9090ff7..861ce67 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h

@@ -778,17 +778,21 @@ static inline bool netdev_phys_item_id_same(struct netdev_phys_item_id *a,
 typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
 				       struct sk_buff *skb);
 
-/* This structure holds attributes of qdisc and classifiers
+/* These structures hold the attributes of qdisc and classifiers
  * that are being passed to the netdevice through the setup_tc op.
  */
 enum {
 	TC_SETUP_MQPRIO,
+	TC_SETUP_CLSU32,
 };
 
+struct tc_cls_u32_offload;
+
 struct tc_to_netdev {
 	unsigned int type;
 	union {
 		u8 tc;
+		struct tc_cls_u32_offload *cls_u32;
 	};
 };
 

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index bc49967..0bd12cd 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h

@@ -358,4 +358,37 @@ tcf_match_indev(struct sk_buff *skb, int ifindex)
 }
 #endif /* CONFIG_NET_CLS_IND */
 
+struct tc_cls_u32_knode {
+	struct tcf_exts *exts;
+	u8 fshift;
+	u32 handle;
+	u32 val;
+	u32 mask;
+	u32 link_handle;
+	struct tc_u32_sel *sel;
+};
+
+struct tc_cls_u32_hnode {
+	u32 handle;
+	u32 prio;
+	unsigned int divisor;
+};
+
+enum {
+	TC_CLSU32_NEW_KNODE,