net: dsa: assign default CPU port to all ports

The current code only assigns the default cpu_dp to all user ports of
the switch to which the CPU port belongs. The user ports of the other
switches of the fabric thus don't have a default CPU port.

This patch fixes this by assigning the cpu_dp of all user ports of all
switches of the fabric when the tree is fully parsed.

Fixes: a29342e73911 ("net: dsa: Associate slave network device with CPU port")
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 11 deletions

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 52af8401af07..56e46090526b 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -490,8 +490,6 @@ static int dsa_cpu_parse(struct dsa_port *port, u32 index,
         enum dsa_tag_protocol tag_protocol;
         struct net_device *ethernet_dev;
         struct device_node *ethernet;
-        struct dsa_port *p;
-        unsigned int i;
 
         if (port->dn) {
                 ethernet = of_parse_phandle(port->dn, "ethernet", 0);
@@ -509,15 +507,6 @@ static int dsa_cpu_parse(struct dsa_port *port, u32 index,
         if (!dst->cpu_dp) {
                 dst->cpu_dp = port;
                 dst->cpu_dp->netdev = ethernet_dev;
-
-                for (i = 0; i < ds->num_ports; i++) {
-                        p = &ds->ports[i];
-                        if (!dsa_port_is_valid(p) ||
-                            i == index)
-                                continue;
-
-                        p->cpu_dp = port;
-                }
         }
 
         tag_protocol = ds->ops->get_tag_protocol(ds);
@@ -572,7 +561,9 @@ static int dsa_ds_parse(struct dsa_switch_tree *dst, struct dsa_switch *ds)
 static int dsa_dst_parse(struct dsa_switch_tree *dst)
 {
         struct dsa_switch *ds;
+        struct dsa_port *dp;
         u32 index;
+        int port;
         int err;
 
         for (index = 0; index < DSA_MAX_SWITCHES; index++) {
@@ -590,6 +581,23 @@ static int dsa_dst_parse(struct dsa_switch_tree *dst)
                 return -EINVAL;
         }
 
+        /* Assign the default CPU port to all ports of the fabric */
+        for (index = 0; index < DSA_MAX_SWITCHES; index++) {
+                ds = dst->ds[index];
+                if (!ds)
+                        continue;
+
+                for (port = 0; port < ds->num_ports; port++) {
+                        dp = &ds->ports[port];
+                        if (!dsa_port_is_valid(dp) ||
+                            dsa_port_is_dsa(dp) ||
+                            dsa_port_is_cpu(dp))
+                                continue;
+
+                        dp->cpu_dp = dst->cpu_dp;
+                }
+        }
+
         pr_info("DSA: tree %d parsed\n", dst->tree);
 
         return 0;