net: dsa: add ds and index to dsa_port

Add the physical switch instance and port index a DSA port belongs to to
the dsa_port structure.

That can be used later to retrieve information about a physical port
when configuring a switch fabric, or lighten up struct dsa_slave_priv.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 6e7b3e88b778..9f8cc26be9ea 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -670,6 +670,7 @@ struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n)
 {
         size_t size = sizeof(struct dsa_switch) + n * sizeof(struct dsa_port);
         struct dsa_switch *ds;
+        int i;
 
         ds = devm_kzalloc(dev, size, GFP_KERNEL);
         if (!ds)
@@ -678,6 +679,11 @@ struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n)
         ds->dev = dev;
         ds->num_ports = n;
 
+        for (i = 0; i < ds->num_ports; ++i) {
+                ds->ports[i].index = i;
+                ds->ports[i].ds = ds;
+        }
+
         return ds;
 }
 EXPORT_SYMBOL_GPL(dsa_switch_alloc);