[RFC PATCH net-next v2 1/1] net: Support for switch port configuration

Varlese, Marco
2014-12-18T11:29:33Z

From: Marco Varlese <marco.varlese@intel.com>

Switch hardware offers a list of attributes that are configurable
on a per port basis.
This patch provides a mechanism to configure switch ports by adding
an NDO for setting specific values to specific attributes.
There will be a separate patch that adds the "get" functionality via
another NDO and another patch that extends iproute2 to call the two
new NDOs.

Signed-off-by: Marco Varlese <marco.varlese@intel.com>
---
include/linux/netdevice.h | 5 ++++
include/uapi/linux/if_link.h | 15 ++++++++++++
net/core/rtnetlink.c | 54 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 74 insertions(+)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index c31f74d..4881c7b 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1027,6 +1027,9 @@ typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
* int (*ndo_switch_port_stp_update)(struct net_device *dev, u8 state);
* Called to notify switch device port of bridge port STP
* state change.
+ * int (*ndo_switch_port_set_cfg)(struct net_device *dev,
+ * u32 attr, u64 value);
+ * Called to set specific switch ports attributes.
*/
struct net_device_ops {
int (*ndo_init)(struct net_device *dev);
@@ -1185,6 +1188,8 @@ struct net_device_ops {
struct netdev_phys_item_id *psid);
int (*ndo_switch_port_stp_update)(struct net_device *dev,
u8 state);
+ int (*ndo_switch_port_set_cfg)(struct net_device *dev,
+ u32 attr, u64 value);
#endif
};

diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index f7d0d2d..19cb51a 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -146,6 +146,7 @@ enum {
IFLA_PHYS_PORT_ID,
IFLA_CARRIER_CHANGES,
IFLA_PHYS_SWITCH_ID,
+ IFLA_SWITCH_PORT_CFG,
__IFLA_MAX
};

@@ -603,4 +604,18 @@ enum {

#define IFLA_HSR_MAX (__IFLA_HSR_MAX - 1)

+/* Switch Port Attributes section */
+
+enum {
+ IFLA_ATTR_UNSPEC,
+ IFLA_ATTR_LEARNING,
+ IFLA_ATTR_LOOPBACK,
+ IFLA_ATTR_BCAST_FLOODING,
+ IFLA_ATTR_UCAST_FLOODING,
+ IFLA_ATTR_MCAST_FLOODING,
+ __IFLA_ATTR_MAX
+};
+
+#define IFLA_ATTR_MAX (__IFLA_ATTR_MAX - 1)
+
#endif /* _UAPI_LINUX_IF_LINK_H */
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index eaa057f..c0d1c45 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1389,6 +1389,46 @@ static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
return 0;
}

+#ifdef CONFIG_NET_SWITCHDEV
+static int do_setswcfg(struct net_device *dev, struct nlattr *attr)
+{
+ int rem, err = -EINVAL;
+ struct nlattr *v;
+ const struct net_device_ops *ops = dev->netdev_ops;
+
+ nla_for_each_nested(v, attr, rem) {
+ u32 op = nla_type(v);
+ u64 value = 0;
+
+ switch (op) {
+ case IFLA_ATTR_LEARNING:
+ case IFLA_ATTR_LOOPBACK:
+ case IFLA_ATTR_BCAST_FLOODING:
+ case IFLA_ATTR_UCAST_FLOODING:
+ case IFLA_ATTR_MCAST_FLOODING: {
+ if (nla_len(v) < sizeof(value)) {
+ err = -EINVAL;
+ break;
+ }
+
+ value = nla_get_u64(v);
+ err = ops->ndo_switch_port_set_cfg(dev,
+ op,
+ value);
+ break;
+ }
+ default:
+ err = -EINVAL;
+ break;
+ }
+ if (err)
+ break;
+ }
+ return err;
+}
+
+#endif
+
static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
{
int rem, err = -EINVAL;
@@ -1740,6 +1780,20 @@ static int do_setlink(const struct sk_buff *skb,
status |= DO_SETLINK_NOTIFY;
}
}
+#ifdef CONFIG_NET_SWITCHDEV
+ if (tb[IFLA_SWITCH_PORT_CFG]) {
+ err = -EOPNOTSUPP;
+ if (!ops->ndo_switch_port_set_cfg)
+ goto errout;
+ if (!ops->ndo_switch_parent_id_get)
+ goto errout;
+ err = do_setswcfg(dev, tb[IFLA_SWITCH_PORT_CFG]);
+ if (err < 0)
+ goto errout;
+
+ status |= DO_SETLINK_NOTIFY;
+ }
+#endif
err = 0;

errout:
--
1.8.5.3