[PATCH] net: dsa: add FIB support

From: John Crispin
Date: Mon Sep 12 2016 - 06:14:44 EST


Add SWITCHDEV_OBJ_ID_IPV4_FIB support to the DSA layer.

Signed-off-by: John Crispin <john@xxxxxxxxxxx>
---
Documentation/networking/dsa/dsa.txt | 18 +++++++++++++++
include/net/dsa.h | 13 +++++++++++
net/dsa/slave.c | 41 ++++++++++++++++++++++++++++++++++
3 files changed, 72 insertions(+)

diff --git a/Documentation/networking/dsa/dsa.txt b/Documentation/networking/dsa/dsa.txt
index 6d6c07c..6cd5831 100644
--- a/Documentation/networking/dsa/dsa.txt
+++ b/Documentation/networking/dsa/dsa.txt
@@ -607,6 +607,24 @@ of DSA, would be the its port-based VLAN, used by the associated bridge device.
function that the driver has to call for each MAC address known to be behind
the given port. A switchdev object is used to carry the VID and MDB info.

+Route offloading
+----------------
+
+- ipv4_fib_prepare: routing layer function invoked to prepare the installation
+ of an ipv4 route into the switches routing database. If the operation is not
+ supported this function should return -EOPNOTSUPP. No hardware setup must be
+ done in this function. See ipv4_fib_add for this and details.
+
+- ipv4_fib_add: routing layer function invoked when a new ipv4 route should be
+ installed into the routing database of the switch, it should be programmed
+ with the route for the specified VLAN ID of the device that the route applies
+ to.
+
+- ipv4_fib_del: routing layer function invoked when an ipv4 route should be
+ removed from the routing database, the switch hardware should be programmed
+ to delete the specified MAC address of the nexthop from the specified VLAN ID
+ if it was mapped into the forwarding database.
+
TODO
====

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 7556646..7fdd63e 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -237,6 +237,7 @@ struct switchdev_obj;
struct switchdev_obj_port_fdb;
struct switchdev_obj_port_mdb;
struct switchdev_obj_port_vlan;
+struct switchdev_obj_ipv4_fib;

struct dsa_switch_ops {
struct list_head list;
@@ -386,6 +387,18 @@ struct dsa_switch_ops {
int (*port_mdb_dump)(struct dsa_switch *ds, int port,
struct switchdev_obj_port_mdb *mdb,
int (*cb)(struct switchdev_obj *obj));
+
+ /*
+ * IPV4 routing
+ */
+ int (*ipv4_fib_prepare)(struct dsa_switch *ds, int port,
+ const struct switchdev_obj_ipv4_fib *fib4,
+ struct switchdev_trans *trans);
+ int (*ipv4_fib_add)(struct dsa_switch *ds, int port,
+ const struct switchdev_obj_ipv4_fib *fib4,
+ struct switchdev_trans *trans);
+ int (*ipv4_fib_del)(struct dsa_switch *ds, int port,
+ const struct switchdev_obj_ipv4_fib *fib4);
};

void register_switch_driver(struct dsa_switch_ops *type);
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 9ecbe78..9e6ceb2 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -334,6 +334,38 @@ static int dsa_slave_port_mdb_dump(struct net_device *dev,
return -EOPNOTSUPP;
}

+static int dsa_slave_ipv4_fib_add(struct net_device *dev,
+ const struct switchdev_obj_ipv4_fib *fib4,
+ struct switchdev_trans *trans)
+{
+ struct dsa_slave_priv *p = netdev_priv(dev);
+ struct dsa_switch *ds = p->parent;
+ int ret;
+
+ if (!ds->drv->ipv4_fib_prepare || !ds->drv->ipv4_fib_add)
+ return -EOPNOTSUPP;
+
+ if (switchdev_trans_ph_prepare(trans))
+ ret = ds->drv->ipv4_fib_prepare(ds, p->port, fib4, trans);
+ else
+ ret = ds->drv->ipv4_fib_add(ds, p->port, fib4, trans);
+
+ return ret;
+}
+
+static int dsa_slave_ipv4_fib_del(struct net_device *dev,
+ const struct switchdev_obj_ipv4_fib *fib4)
+{
+ struct dsa_slave_priv *p = netdev_priv(dev);
+ struct dsa_switch *ds = p->parent;
+ int ret = -EOPNOTSUPP;
+
+ if (ds->drv->ipv4_fib_del)
+ ret = ds->drv->ipv4_fib_del(ds, p->port, fib4);
+
+ return ret;
+}
+
static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
struct dsa_slave_priv *p = netdev_priv(dev);
@@ -465,6 +497,11 @@ static int dsa_slave_port_obj_add(struct net_device *dev,
SWITCHDEV_OBJ_PORT_VLAN(obj),
trans);
break;
+ case SWITCHDEV_OBJ_ID_IPV4_FIB:
+ err = dsa_slave_ipv4_fib_add(dev,
+ SWITCHDEV_OBJ_IPV4_FIB(obj),
+ trans);
+ break;
default:
err = -EOPNOTSUPP;
break;
@@ -490,6 +527,10 @@ static int dsa_slave_port_obj_del(struct net_device *dev,
err = dsa_slave_port_vlan_del(dev,
SWITCHDEV_OBJ_PORT_VLAN(obj));
break;
+ case SWITCHDEV_OBJ_ID_IPV4_FIB:
+ err = dsa_slave_ipv4_fib_del(dev,
+ SWITCHDEV_OBJ_IPV4_FIB(obj));
+ break;
default:
err = -EOPNOTSUPP;
break;
--
1.7.10.4