net/sched: cls_api: Expose tc block to the datapath

vbnogueira · davem330 · commit a7042cf8f231 · 2023-12-26T21:20:08.000Z
The datapath can now find the block of the port in which the packet arrived
at.

In the next patch we show a possible usage of this patch in a new
version of mirred that multicasts to all ports except for the port in
which the packet arrived on.

Co-developed-by: Jamal Hadi Salim &lt;jhs@mojatatu.com&gt;
Signed-off-by: Jamal Hadi Salim &lt;jhs@mojatatu.com&gt;
Co-developed-by: Pedro Tammela &lt;pctammela@mojatatu.com&gt;
Signed-off-by: Pedro Tammela &lt;pctammela@mojatatu.com&gt;
Signed-off-by: Victor Nogueira &lt;victor@mojatatu.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
@@ -484,6 +484,8 @@ 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
@@ -1011,12 +1011,13 @@ 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)
 {

Original file line number	Diff line number	Diff line change
`@@ -484,6 +484,8 @@ struct tcf_block {`
`484`	`484`	`struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */`
`485`	`485`	`};`
`486`	`486`
	`487`	`+struct tcf_block tcf_block_lookup(struct net net, u32 block_index);`
	`488`	`+`
`487`	`489`	`static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)`
`488`	`490`	`{`
`489`	`491`	`return lockdep_is_held(&chain->filter_chain_lock);`
Original file line number	Diff line number	Diff line change
`@@ -1011,12 +1011,13 @@ static struct tcf_block tcf_block_create(struct net net, struct Qdisc *q,`
`1011`	`1011`	`return block;`
`1012`	`1012`	`}`
`1013`	`1013`
`1014`		`-static struct tcf_block tcf_block_lookup(struct net net, u32 block_index)`
	`1014`	`+struct tcf_block tcf_block_lookup(struct net net, u32 block_index)`
`1015`	`1015`	`{`
`1016`	`1016`	`struct tcf_net *tn = net_generic(net, tcf_net_id);`
`1017`	`1017`
`1018`	`1018`	`return idr_find(&tn->idr, block_index);`
`1019`	`1019`	`}`
	`1020`	`+EXPORT_SYMBOL(tcf_block_lookup);`
`1020`	`1021`
`1021`	`1022`	`static struct tcf_block tcf_block_refcnt_get(struct net net, u32 block_index)`
`1022`	`1023`	`{`