[patch net-next v3 05/17] rtnl: expose physical switch id for particular device

Jiri Pirko
2014-11-25T10:56:43Z

The netdevice represents a port in a switch, it will expose
IFLA_PHYS_SWITCH_ID value via rtnl. Two netdevices with the same value
belong to one physical switch.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Reviewed-by: Thomas Graf <tgraf@suug.ch>
Acked-by: John Fastabend <john.r.fastabend@intel.com>
---
v2->v3:
-changed "sw" string to "switch" to avoid confusion
v1->v2:
-no change
---
include/uapi/linux/if_link.h | 1 +
net/core/rtnetlink.c | 26 +++++++++++++++++++++++++-
2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 7072d83..4163753 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -145,6 +145,7 @@ enum {
IFLA_CARRIER,
IFLA_PHYS_PORT_ID,
IFLA_CARRIER_CHANGES,
+ IFLA_PHYS_SWITCH_ID,
__IFLA_MAX
};

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 0fb3a68..bd5e783 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -44,6 +44,7 @@

#include <linux/inet.h>
#include <linux/netdevice.h>
+#include <net/switchdev.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <net/arp.h>
@@ -869,7 +870,8 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev,
+ rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
+ rtnl_link_get_size(dev) /* IFLA_LINKINFO */
+ rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */
- + nla_total_size(MAX_PHYS_ITEM_ID_LEN); /* IFLA_PHYS_PORT_ID */
+ + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
+ + nla_total_size(MAX_PHYS_ITEM_ID_LEN); /* IFLA_PHYS_SWITCH_ID */
}

static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
@@ -968,6 +970,24 @@ static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
return 0;
}

+static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
+{
+ int err;
+ struct netdev_phys_item_id psid;
+
+ err = netdev_switch_parent_id_get(dev, &psid);
+ if (err) {
+ if (err == -EOPNOTSUPP)
+ return 0;
+ return err;
+ }
+
+ if (nla_put(skb, IFLA_PHYS_SWITCH_ID, psid.id_len, psid.id))
+ return -EMSGSIZE;
+
+ return 0;
+}
+
static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
int type, u32 pid, u32 seq, u32 change,
unsigned int flags, u32 ext_filter_mask)
@@ -1040,6 +1060,9 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
if (rtnl_phys_port_id_fill(skb, dev))
goto nla_put_failure;

+ if (rtnl_phys_switch_id_fill(skb, dev))
+ goto nla_put_failure;
+
attr = nla_reserve(skb, IFLA_STATS,
sizeof(struct rtnl_link_stats));
if (attr == NULL)
@@ -1199,6 +1222,7 @@ static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
[IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
[IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
[IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */
+ [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
};

static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
--
1.9.3