realtek: set up L2 table entries properly

Initialize the data structure using memset to avoid the possibility of
writing garbage values to the hardware.

Always set a valid entry type, which should fix writing unicast entries
on RTL930x.

For unicast entries, set the is_static flag to prevent the switch from
aging them out.

Also set the rvid field for unicast entries. This is not strictly
necessary, as the switch fills it in automatically from a non-zero vid.
However, this makes the code consistent with multicast entry setup.

While at it, reorder the statements and fix some style issues (double
space, comma instead of semicolon at end of statement). Also remove the
unneeded priv parameter and debug print for the multicast entry setup
function.

Fixes: cde31976e37 ("realtek: Add support for Layer 2 Multicast")
Signed-off-by: Jan Hoffmann <[email protected]>

target/linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/dsa.c

@@ -1537,23 +1537,32 @@ static int rtl83xx_vlan_del(struct dsa_switch *ds, int port,
 
 static void rtl83xx_setup_l2_uc_entry(struct rtl838x_l2_entry *e, int port, int vid, u64 mac)
 {
-	e->is_ip_mc = e->is_ipv6_mc  = false;
+	memset(e, 0, sizeof(*e));
+
+	e->type = L2_UNICAST;
 	e->valid = true;
+
 	e->age = 3;
-	e->port = port,
-	e->vid = vid;
+	e->is_static = true;
+
+	e->port = port;
+
+	e->rvid = e->vid = vid;
+	e->is_ip_mc = e->is_ipv6_mc = false;
 	u64_to_ether_addr(mac, e->mac);
 }
 
-static void rtl83xx_setup_l2_mc_entry(struct rtl838x_switch_priv *priv,
-				      struct rtl838x_l2_entry *e, int vid, u64 mac, int mc_group)
+static void rtl83xx_setup_l2_mc_entry(struct rtl838x_l2_entry *e, int vid, u64 mac, int mc_group)
 {
-	e->is_ip_mc = e->is_ipv6_mc  = false;
+	memset(e, 0, sizeof(*e));
+
+	e->type = L2_MULTICAST;
 	e->valid = true;
+
 	e->mc_portmask_index = mc_group;
-	e->type = L2_MULTICAST;
+
 	e->rvid = e->vid = vid;
-	pr_debug("%s: vid: %d, rvid: %d\n", __func__, e->vid, e->rvid);
+	e->is_ip_mc = e->is_ipv6_mc = false;
 	u64_to_ether_addr(mac, e->mac);
 }
 
@@ -1768,7 +1777,7 @@ static void rtl83xx_port_mdb_add(struct dsa_switch *ds, int port,
 				err = -ENOTSUPP;
 				goto out;
 			}
-			rtl83xx_setup_l2_mc_entry(priv, &e, vid, mac, mc_group);
+			rtl83xx_setup_l2_mc_entry(&e, vid, mac, mc_group);
 			priv->r->write_l2_entry_using_hash(idx >> 2, idx & 0x3, &e);
 		}
 		goto out;
@@ -1789,7 +1798,7 @@ static void rtl83xx_port_mdb_add(struct dsa_switch *ds, int port,
 				err = -ENOTSUPP;
 				goto out;
 			}
-			rtl83xx_setup_l2_mc_entry(priv, &e, vid, mac, mc_group);
+			rtl83xx_setup_l2_mc_entry(&e, vid, mac, mc_group);
 			priv->r->write_cam(idx, &e);
 		}
 		goto out;