net: mscc: ocelot: simplify tc-flower offload structures

The ocelot tc-flower offload binds a second flow block callback (apart
from the one for matchall) just because it uses a different block
private structure (ocelot_port_private for matchall, ocelot_port_block
for flower).

But ocelot_port_block just appears to be boilerplate, and doesn't help
with anything in particular at all, it's just useless glue between the
(global!) struct ocelot_acl_block *block pointer, and a per-netdevice
struct ocelot_port_private *priv.

So let's just simplify that, and make struct ocelot_port_private be the
private structure for the block offload. This makes us able to use the
same flow callback as in the case of matchall.

This also reveals that the struct ocelot_acl_block *block is used rather
strangely, as mentioned above: it is defined globally, allocated at
probe time, and freed at unbind time. So just move the structure to the
main ocelot structure, which gives further opportunity for
simplification.

Also get rid of backpointers from struct ocelot_acl_block and struct
ocelot_ace_rule back to struct ocelot, by reworking the function
prototypes, where necessary, to use a more DSA-friendly "struct ocelot
*ocelot, int port" format.

And finally, remove the debugging prints that were added during
development, since they provide no useful information at this point.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Tested-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Reviewed-by: Allan W. Nielsen <allan.nielsen@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 28 insertions, 127 deletions

diff --git a/drivers/net/ethernet/mscc/ocelot_flower.c b/drivers/net/ethernet/mscc/ocelot_flower.c
index ffd2bb50cfc3..b9673df6dbc5 100644
--- a/drivers/net/ethernet/mscc/ocelot_flower.c
+++ b/drivers/net/ethernet/mscc/ocelot_flower.c
@@ -8,11 +8,6 @@
 
 #include "ocelot_ace.h"
 
-struct ocelot_port_block {
-	struct ocelot_acl_block *block;
-	struct ocelot_port_private *priv;
-};
-
 static int ocelot_flower_parse_action(struct flow_cls_offload *f,
 				      struct ocelot_ace_rule *rule)
 {
@@ -168,8 +163,8 @@ finished_key_parsing:
 }
 
 static
-struct ocelot_ace_rule *ocelot_ace_rule_create(struct flow_cls_offload *f,
-					       struct ocelot_port_block *block)
+struct ocelot_ace_rule *ocelot_ace_rule_create(struct ocelot *ocelot, int port,
+					       struct flow_cls_offload *f)
 {
 	struct ocelot_ace_rule *rule;
 
@@ -177,18 +172,17 @@ struct ocelot_ace_rule *ocelot_ace_rule_create(struct flow_cls_offload *f,
 	if (!rule)
 		return NULL;
 
-	rule->ocelot = block->priv->port.ocelot;
-	rule->ingress_port_mask = BIT(block->priv->chip_port);
+	rule->ingress_port_mask = BIT(port);
 	return rule;
 }
 
-static int ocelot_flower_replace(struct flow_cls_offload *f,
-				 struct ocelot_port_block *port_block)
+int ocelot_cls_flower_replace(struct ocelot *ocelot, int port,
+			      struct flow_cls_offload *f, bool ingress)
 {
 	struct ocelot_ace_rule *rule;
 	int ret;
 
-	rule = ocelot_ace_rule_create(f, port_block);
+	rule = ocelot_ace_rule_create(ocelot, port, f);
 	if (!rule)
 		return -ENOMEM;
 
@@ -198,159 +192,66 @@ static int ocelot_flower_replace(struct flow_cls_offload *f,
 		return ret;
 	}
 
-	ret = ocelot_ace_rule_offload_add(rule);
+	ret = ocelot_ace_rule_offload_add(ocelot, rule);
 	if (ret)
 		return ret;
 
-	port_block->priv->tc.offload_cnt++;
 	return 0;
 }
+EXPORT_SYMBOL_GPL(ocelot_cls_flower_replace);
 
-static int ocelot_flower_destroy(struct flow_cls_offload *f,
-				 struct ocelot_port_block *port_block)
+int ocelot_cls_flower_destroy(struct ocelot *ocelot, int port,
+			      struct flow_cls_offload *f, bool ingress)
 {
 	struct ocelot_ace_rule rule;
 	int ret;
 
 	rule.prio = f->common.prio;
-	rule.ocelot = port_block->priv->port.ocelot;
 	rule.id = f->cookie;
 
-	ret = ocelot_ace_rule_offload_del(&rule);
+	ret = ocelot_ace_rule_offload_del(ocelot, &rule);
 	if (ret)
 		return ret;
 
-	port_block->priv->tc.offload_cnt--;
 	return 0;
 }
+EXPORT_SYMBOL_GPL(ocelot_cls_flower_destroy);
 
-static int ocelot_flower_stats_update(struct flow_cls_offload *f,
-				      struct ocelot_port_block *port_block)
+int ocelot_cls_flower_stats(struct ocelot *ocelot, int port,
+			    struct flow_cls_offload *f, bool ingress)
 {
 	struct ocelot_ace_rule rule;
 	int ret;
 
 	rule.prio = f->common.prio;
-	rule.ocelot = port_block->priv->port.ocelot;
 	rule.id = f->cookie;
-	ret = ocelot_ace_rule_stats_update(&rule);
+	ret = ocelot_ace_rule_stats_update(ocelot, &rule);
 	if (ret)
 		return ret;
 
 	flow_stats_update(&f->stats, 0x0, rule.stats.pkts, 0x0);
 	return 0;
 }
+EXPORT_SYMBOL_GPL(ocelot_cls_flower_stats);
 
-static int ocelot_setup_tc_cls_flower(struct flow_cls_offload *f,
-				      struct ocelot_port_block *port_block)
+int ocelot_setup_tc_cls_flower(struct ocelot_port_private *priv,
+			       struct flow_cls_offload *f,
+			       bool ingress)
 {
+	struct ocelot *ocelot = priv->port.ocelot;
+	int port = priv->chip_port;
+
+	if (!ingress)
+		return -EOPNOTSUPP;
+
 	switch (f->command) {
 	case FLOW_CLS_REPLACE:
-		return ocelot_flower_replace(f, port_block);
+		return ocelot_cls_flower_replace(ocelot, port, f, ingress);
 	case FLOW_CLS_DESTROY:
-		return ocelot_flower_destroy(f, port_block);
+		return ocelot_cls_flower_destroy(ocelot, port, f, ingress);
 	case FLOW_CLS_STATS:
-		return ocelot_flower_stats_update(f, port_block);
+		return ocelot_cls_flower_stats(ocelot, port, f, ingress);
 	default:
 		return -EOPNOTSUPP;
 	}
 }
-
-static int ocelot_setup_tc_block_cb_flower(enum tc_setup_type type,
-					   void *type_data, void *cb_priv)
-{
-	struct ocelot_port_block *port_block = cb_priv;
-
-	if (!tc_cls_can_offload_and_chain0(port_block->priv->dev, type_data))
-		return -EOPNOTSUPP;
-
-	switch (type) {
-	case TC_SETUP_CLSFLOWER:
-		return ocelot_setup_tc_cls_flower(type_data, cb_priv);
-	case TC_SETUP_CLSMATCHALL:
-		return 0;
-	default:
-		return -EOPNOTSUPP;
-	}
-}
-
-static struct ocelot_port_block*
-ocelot_port_block_create(struct ocelot_port_private *priv)
-{
-	struct ocelot_port_block *port_block;
-
-	port_block = kzalloc(sizeof(*port_block), GFP_KERNEL);
-	if (!port_block)
-		return NULL;
-
-	port_block->priv = priv;
-
-	return port_block;
-}
-
-static void ocelot_port_block_destroy(struct ocelot_port_block *block)
-{
-	kfree(block);
-}
-
-static void ocelot_tc_block_unbind(void *cb_priv)
-{
-	struct ocelot_port_block *port_block = cb_priv;
-
-	ocelot_port_block_destroy(port_block);
-}
-
-int ocelot_setup_tc_block_flower_bind(struct ocelot_port_private *priv,
-				      struct flow_block_offload *f)
-{
-	struct ocelot_port_block *port_block;
-	struct flow_block_cb *block_cb;
-	int ret;
-
-	if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
-		return -EOPNOTSUPP;
-
-	block_cb = flow_block_cb_lookup(f->block,
-					ocelot_setup_tc_block_cb_flower, priv);
-	if (!block_cb) {
-		port_block = ocelot_port_block_create(priv);
-		if (!port_block)
-			return -ENOMEM;
-
-		block_cb = flow_block_cb_alloc(ocelot_setup_tc_block_cb_flower,
-					       priv, port_block,
-					       ocelot_tc_block_unbind);
-		if (IS_ERR(block_cb)) {
-			ret = PTR_ERR(block_cb);
-			goto err_cb_register;
-		}
-		flow_block_cb_add(block_cb, f);
-		list_add_tail(&block_cb->driver_list, f->driver_block_list);
-	} else {
-		port_block = flow_block_cb_priv(block_cb);
-	}
-
-	flow_block_cb_incref(block_cb);
-	return 0;
-
-err_cb_register:
-	ocelot_port_block_destroy(port_block);
-
-	return ret;
-}
-
-void ocelot_setup_tc_block_flower_unbind(struct ocelot_port_private *priv,
-					 struct flow_block_offload *f)
-{
-	struct flow_block_cb *block_cb;
-
-	block_cb = flow_block_cb_lookup(f->block,
-					ocelot_setup_tc_block_cb_flower, priv);
-	if (!block_cb)
-		return;
-
-	if (!flow_block_cb_decref(block_cb)) {
-		flow_block_cb_remove(block_cb, f);
-		list_del(&block_cb->driver_list);
-	}
-}