[PATCH net-next 3/9] net: dsa: add ds and index to dsa_port

[Vivien Didelot]

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.dide...@savoirfairelinux.com>
---
 include/net/dsa.h | 2 ++
 net/dsa/dsa2.c    | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 24e1d935ae68..6bd1f8b05dbd 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -140,6 +140,8 @@ struct dsa_switch_tree {
 };
 
 struct dsa_port {
+       struct dsa_switch       *ds;
+       unsigned int            index;
        struct net_device       *netdev;
        struct device_node      *dn;
        unsigned int            ageing_time;
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);
-- 
2.11.0