netdev - [PATCH net-next RFC v5 3/4] net/sched: cls_api: Expose tc block to the datapath

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Date: Fri, 10 Nov 2023 18:46:17 -0300
From: Victor Nogueira <victor@...atatu.com>
To: jhs@...atatu.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	xiyou.wangcong@...il.com,
	jiri@...nulli.us
Cc: mleitner@...hat.com,
	vladbu@...dia.com,
	paulb@...dia.com,
	pctammela@...atatu.com,
	netdev@...r.kernel.org,
	kernel@...atatu.com
Subject: [PATCH net-next RFC v5 3/4] net/sched: cls_api: Expose tc block to the datapath

The datapath can now find the block of the port in which the packet arrived
at.

In the next patch we show a simple action(blockcast) that multicasts to all
ports except for the port in which the packet arrived on.

Co-developed-by: Jamal Hadi Salim <jhs@...atatu.com>
Signed-off-by: Jamal Hadi Salim <jhs@...atatu.com>
Co-developed-by: Pedro Tammela <pctammela@...atatu.com>
Signed-off-by: Pedro Tammela <pctammela@...atatu.com>
Signed-off-by: Victor Nogueira <victor@...atatu.com>
---
 include/net/sch_generic.h | 2 ++
 net/sched/cls_api.c       | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index cefca55dd4f9..479bc195bb0f 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -487,6 +487,8 @@ struct tcf_block {
 	struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
 };
 
+struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index);
+
 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
 {
 	return lockdep_is_held(&chain->filter_chain_lock);
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 42f760ab7e43..e7015c2dbbbb 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -1012,12 +1012,13 @@ static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
 	return block;
 }
 
-static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
+struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
 {
 	struct tcf_net *tn = net_generic(net, tcf_net_id);
 
 	return idr_find(&tn->idr, block_index);
 }
+EXPORT_SYMBOL(tcf_block_lookup);
 
 static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index)
 {
-- 
2.25.1