[patch net-next v2 6/9] net: sched: cls_flower: propagate chain teplate creation and destruction to drivers

[Jiri Pirko]

From: Jiri Pirko <j...@mellanox.com>

Introduce a couple of flower offload commands in order to propagate
template creation/destruction events down to device drivers.
Drivers may use this information to prepare HW in an optimal way
for future filter insertions.

Signed-off-by: Jiri Pirko <j...@mellanox.com>
---
v1->v2:
- remove leftover extack arg in fl_hw_create_tmplt()
---
 include/net/pkt_cls.h  |  2 ++
 net/sched/cls_flower.c | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index a3c1a2c47cd4..e83968cf9a70 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -715,6 +715,8 @@ enum tc_fl_command {
        TC_CLSFLOWER_REPLACE,
        TC_CLSFLOWER_DESTROY,
        TC_CLSFLOWER_STATS,
+       TC_CLSFLOWER_TMPLT_CREATE,
+       TC_CLSFLOWER_TMPLT_DESTROY,
 };
 
 struct tc_cls_flower_offload {
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index d64d43843a3a..614dd558d5f1 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -1120,6 +1120,42 @@ static void fl_walk(struct tcf_proto *tp, struct 
tcf_walker *arg)
        }
 }
 
+static void fl_hw_create_tmplt(struct tcf_chain *chain,
+                              struct fl_flow_tmplt *tmplt)
+{
+       struct tc_cls_flower_offload cls_flower = {};
+       struct tcf_block *block = chain->block;
+       struct tcf_exts dummy_exts = { 0, };
+
+       cls_flower.common.chain_index = chain->index;
+       cls_flower.command = TC_CLSFLOWER_TMPLT_CREATE;
+       cls_flower.cookie = (unsigned long) tmplt;
+       cls_flower.dissector = &tmplt->dissector;
+       cls_flower.mask = &tmplt->mask;
+       cls_flower.key = &tmplt->dummy_key;
+       cls_flower.exts = &dummy_exts;
+
+       /* We don't care if driver (any of them) fails to handle this
+        * call. It serves just as a hint for it.
+        */
+       tc_setup_cb_call(block, NULL, TC_SETUP_CLSFLOWER,
+                        &cls_flower, false);
+}
+
+static void fl_hw_destroy_tmplt(struct tcf_chain *chain,
+                               struct fl_flow_tmplt *tmplt)
+{
+       struct tc_cls_flower_offload cls_flower = {};
+       struct tcf_block *block = chain->block;
+
+       cls_flower.common.chain_index = chain->index;
+       cls_flower.command = TC_CLSFLOWER_TMPLT_DESTROY;
+       cls_flower.cookie = (unsigned long) tmplt;
+
+       tc_setup_cb_call(block, NULL, TC_SETUP_CLSFLOWER,
+                        &cls_flower, false);
+}
+
 static void *fl_tmplt_create(struct net *net, struct tcf_chain *chain,
                             struct nlattr **tca,
                             struct netlink_ext_ack *extack)
@@ -1150,6 +1186,8 @@ static void *fl_tmplt_create(struct net *net, struct 
tcf_chain *chain,
 
        fl_init_dissector(&tmplt->dissector, &tmplt->mask);
 
+       fl_hw_create_tmplt(chain, tmplt);
+
        return tmplt;
 
 errout_tmplt:
@@ -1163,6 +1201,7 @@ static void fl_tmplt_destroy(void *tmplt_priv)
 {
        struct fl_flow_tmplt *tmplt = tmplt_priv;
 
+       fl_hw_destroy_tmplt(tmplt->chain, tmplt);
        kfree(tmplt);
 }
 
-- 
2.14.4