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Date: Fri, 11 Feb 2011 16:21:26 +0100
From: Jiri Pirko <jpirko@...hat.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, shemminger@...ux-foundation.org,
kaber@...sh.net, fubar@...ibm.com
Subject: [patch net-next-2.6 1/4] net: extend netlink interface to handle
generic slave management
Drivers like bridge and bonding uses their own way to manipulate with
underlink devices. This is an attempt to introduce common interface using
netlink.
Signed-off-by: Jiri Pirko <jpirko@...hat.com>
---
include/linux/if_link.h | 13 +++++++
include/linux/netdevice.h | 22 ++++++++++++
net/core/rtnetlink.c | 81 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 116 insertions(+), 0 deletions(-)
diff --git a/include/linux/if_link.h b/include/linux/if_link.h
index f4a2e6b..48a5f95 100644
--- a/include/linux/if_link.h
+++ b/include/linux/if_link.h
@@ -136,6 +136,9 @@ enum {
IFLA_PORT_SELF,
IFLA_AF_SPEC,
IFLA_GROUP, /* Group the device belongs to */
+ IFLA_SLAVE_LIST,
+ IFLA_SLAVE_ADD,
+ IFLA_SLAVE_DEL,
__IFLA_MAX
};
@@ -379,4 +382,14 @@ struct ifla_port_vsi {
__u8 pad[3];
};
+/* Slave devices management section */
+
+enum {
+ IFLA_SLAVE_UNSPEC,
+ IFLA_SLAVE_DEV,
+ __IFLA_SLAVE_MAX,
+};
+
+#define IFLA_SLAVE_MAX (__IFLA_SLAVE_MAX - 1)
+
#endif /* _LINUX_IF_LINK_H */
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index c7d7074..844cb85 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -783,6 +783,21 @@ struct netdev_tc_txq {
* Set hardware filter for RFS. rxq_index is the target queue index;
* flow_id is a flow ID to be passed to rps_may_expire_flow() later.
* Return the filter ID on success, or a negative error code.
+ *
+ * Slave management functions (for bridge, bonding, etc). User should
+ * make sure that slave list doesn't change within rtnl_lock.
+ * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev);
+ * Called to make another netdev an underlink.
+ *
+ * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
+ * Called to release previously enslaved netdev.
+ *
+ * int (*ndo_get_slave_count)(const struct net_device *dev);
+ * Called to get number of enslaved devices.
+ *
+ * struct net_device * (*ndo_get_slave)(const struct net_device *dev,
+ * int slave_index);
+ * Called to get slave device by it's index.
*/
#define HAVE_NET_DEVICE_OPS
struct net_device_ops {
@@ -862,6 +877,13 @@ struct net_device_ops {
u16 rxq_index,
u32 flow_id);
#endif
+ int (*ndo_add_slave)(struct net_device *dev,
+ struct net_device *slave_dev);
+ int (*ndo_del_slave)(struct net_device *dev,
+ struct net_device *slave_dev);
+ int (*ndo_get_slave_count)(const struct net_device *dev);
+ struct net_device * (*ndo_get_slave)(const struct net_device *dev,
+ int slave_index);
};
/*
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index da0fe45..1402a3f 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -739,6 +739,20 @@ static size_t rtnl_port_size(const struct net_device *dev)
return port_self_size;
}
+static size_t rtnl_slave_list_size(const struct net_device *dev)
+{
+ size_t slave_size = nla_total_size(sizeof(struct nlattr)) +
+ nla_total_size(4);
+ size_t slave_list_size = nla_total_size(sizeof(struct nlattr));
+ int slave_count;
+
+ if (!dev->netdev_ops->ndo_get_slave_count ||
+ !dev->netdev_ops->ndo_get_slave)
+ return 0;
+ slave_count = dev->netdev_ops->ndo_get_slave_count(dev);
+ return slave_list_size + slave_count * slave_size;
+}
+
static noinline size_t if_nlmsg_size(const struct net_device *dev)
{
return NLMSG_ALIGN(sizeof(struct ifinfomsg))
@@ -760,6 +774,7 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev)
+ nla_total_size(4) /* IFLA_NUM_VF */
+ rtnl_vfinfo_size(dev) /* IFLA_VFINFO_LIST */
+ rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
+ + rtnl_slave_list_size(dev) /* IFLA_SLAVE_LIST */
+ rtnl_link_get_size(dev) /* IFLA_LINKINFO */
+ rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */
}
@@ -839,6 +854,39 @@ static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
return 0;
}
+static int rtnl_slave_list_fill(struct sk_buff *skb, struct net_device *dev)
+{
+ int slave_count;
+ int i;
+ struct nlattr *slave_list;
+
+ if (!dev->netdev_ops->ndo_get_slave_count ||
+ !dev->netdev_ops->ndo_get_slave)
+ return 0;
+ slave_count = dev->netdev_ops->ndo_get_slave_count(dev);
+ slave_list = nla_nest_start(skb, IFLA_SLAVE_LIST);
+ if (!slave_list)
+ return -EMSGSIZE;
+ for (i = 0; i < slave_count; i++) {
+ struct net_device *slave_dev;
+
+ slave_dev = dev->netdev_ops->ndo_get_slave(dev, i);
+ if (!slave_dev) {
+ nla_nest_cancel(skb, slave_list);
+ goto nla_put_failure;
+ }
+ NLA_PUT_U32(skb, IFLA_SLAVE_DEV, slave_dev->ifindex);
+ }
+ nla_nest_end(skb, slave_list);
+
+ return 0;
+
+nla_put_failure:
+ nla_nest_cancel(skb, slave_list);
+ return -EMSGSIZE;
+
+}
+
static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
int type, u32 pid, u32 seq, u32 change,
unsigned int flags)
@@ -953,6 +1001,9 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
if (rtnl_port_fill(skb, dev))
goto nla_put_failure;
+ if (rtnl_slave_list_fill(skb, dev))
+ goto nla_put_failure;
+
if (dev->rtnl_link_ops) {
if (rtnl_link_fill(skb, dev) < 0)
goto nla_put_failure;
@@ -1047,6 +1098,8 @@ const struct nla_policy ifla_policy[IFLA_MAX+1] = {
[IFLA_VF_PORTS] = { .type = NLA_NESTED },
[IFLA_PORT_SELF] = { .type = NLA_NESTED },
[IFLA_AF_SPEC] = { .type = NLA_NESTED },
+ [IFLA_SLAVE_ADD] = { .type = NLA_U32 },
+ [IFLA_SLAVE_DEL] = { .type = NLA_U32 },
};
EXPORT_SYMBOL(ifla_policy);
@@ -1392,6 +1445,34 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
modified = 1;
}
}
+
+ if (tb[IFLA_SLAVE_ADD]) {
+ int ifindex = nla_get_u32(tb[IFLA_SLAVE_ADD]);
+ struct net_device *slave_dev;
+
+ err = -EOPNOTSUPP;
+ if (ops->ndo_add_slave) {
+ slave_dev = __dev_get_by_index(dev_net(dev), ifindex);
+ err = ops->ndo_add_slave(dev, slave_dev);
+ }
+ if (err < 0)
+ goto errout;
+ modified = 1;
+ }
+
+ if (tb[IFLA_SLAVE_DEL]) {
+ int ifindex = nla_get_u32(tb[IFLA_SLAVE_DEL]);
+ struct net_device *slave_dev;
+
+ err = -EOPNOTSUPP;
+ if (ops->ndo_del_slave) {
+ slave_dev = __dev_get_by_index(dev_net(dev), ifindex);
+ err = ops->ndo_del_slave(dev, slave_dev);
+ }
+ if (err < 0)
+ goto errout;
+ modified = 1;
+ }
err = 0;
errout:
--
1.7.3.4
--
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