[PATCH net 4/4] net: dsa: motorcomm: Delete the ACL rule of the port being unbound

[David Yang <mmyangfl@gmail.com>]

A flower filter on a block shared across ports is offloaded as one
hardware rule per port, all carrying the same classifier cookie.
Deletion looked a rule up by cookie alone and could take another
port's copy: with skip_sw, a filter silently stopped being enforced
on a still-bound port, while the detached port kept enforcing it.

Delete the rule matching the port being unbound instead.

Fixes: 8eb9e7520b17 ("net: dsa: yt921x: Add ACL support")
Signed-off-by: David Yang <mmyangfl@gmail.com>
---
 drivers/net/dsa/motorcomm/tc.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/net/dsa/motorcomm/tc.c b/drivers/net/dsa/motorcomm/tc.c
index 87c04f0dd736..235ecc1eedc9 100644
--- a/drivers/net/dsa/motorcomm/tc.c
+++ b/drivers/net/dsa/motorcomm/tc.c
@@ -1223,7 +1223,7 @@ static u16 yt921x_acl_activated_ports(const struct yt921x_priv *priv)
 
 static unsigned int
 yt921x_acl_find(const struct yt921x_priv *priv, enum tc_setup_type type,
-		unsigned long tag)
+		unsigned long tag, u16 ports_mask)
 {
 	for (unsigned int blkid = 0; blkid < YT921X_ACL_BLK_NUM; blkid++) {
 		const struct yt921x_acl_blk *aclblk = priv->acl_blks[blkid];
@@ -1233,7 +1233,10 @@ yt921x_acl_find(const struct yt921x_priv *priv, enum tc_setup_type type,
 
 		for (unsigned int i = 0; i < YT921X_ACL_ENT_PER_BLK; i++)
 			if (aclblk->rules[i] && aclblk->rules[i]->tag == tag &&
-			    aclblk->rules[i]->type == type)
+			    aclblk->rules[i]->type == type &&
+			    FIELD_GET(YT921X_ACL_KEYb_SPORTS_M,
+				      aclblk->rules[i]->entries[0].key[1]) ==
+			    ports_mask)
 				return YT921X_ACL_ENT_PER_BLK * blkid + i;
 	}
 
@@ -1361,7 +1364,7 @@ yt921x_acl_commit(struct yt921x_priv *priv, unsigned int entid, u8 entsmask)
 
 static int
 yt921x_acl_del(struct yt921x_priv *priv, enum tc_setup_type type,
-	       unsigned long tag)
+	       unsigned long tag, u16 ports_mask)
 {
 	struct yt921x_acl_rule *aclrule;
 	struct yt921x_acl_blk *aclblk;
@@ -1375,7 +1378,7 @@ yt921x_acl_del(struct yt921x_priv *priv, enum tc_setup_type type,
 	int res;
 	int ret;
 
-	entid = yt921x_acl_find(priv, type, tag);
+	entid = yt921x_acl_find(priv, type, tag, ports_mask);
 	if (entid == UINT_MAX)
 		return -ENOENT;
 
@@ -1550,7 +1553,7 @@ yt921x_dsa_cls_flower_del(struct dsa_switch *ds, int port,
 	int res;
 
 	mutex_lock(&priv->reg_lock);
-	res = yt921x_acl_del(priv, TC_SETUP_CLSFLOWER, cls->cookie);
+	res = yt921x_acl_del(priv, TC_SETUP_CLSFLOWER, cls->cookie, BIT(port));
 	mutex_unlock(&priv->reg_lock);
 
 	return res;
-- 
2.53.0