tipc: add link stat reset to new netlink api

Add TIPC_NL_LINK_RESET_STATS command to the new netlink API.

This command resets the link statistics for a particular link.

Netlink logical layout of link reset message:
-> link
    -> name

Signed-off-by: Richard Alpe <richard.alpe@ericsson.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 49 insertions, 0 deletions

diff --git a/net/tipc/link.c b/net/tipc/link.c
index 6785dcfd2d23..629e8cf393bf 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -2783,3 +2783,52 @@ err_out:
 
         return err;
 }
+
+int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info)
+{
+        int err;
+        char *link_name;
+        unsigned int bearer_id;
+        struct tipc_link *link;
+        struct tipc_node *node;
+        struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
+
+        if (!info->attrs[TIPC_NLA_LINK])
+                return -EINVAL;
+
+        err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
+                               info->attrs[TIPC_NLA_LINK],
+                               tipc_nl_link_policy);
+        if (err)
+                return err;
+
+        if (!attrs[TIPC_NLA_LINK_NAME])
+                return -EINVAL;
+
+        link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
+
+        if (strcmp(link_name, tipc_bclink_name) == 0) {
+                err = tipc_bclink_reset_stats();
+                if (err)
+                        return err;
+                return 0;
+        }
+
+        node = tipc_link_find_owner(link_name, &bearer_id);
+        if (!node)
+                return -EINVAL;
+
+        tipc_node_lock(node);
+
+        link = node->links[bearer_id];
+        if (!link) {
+                tipc_node_unlock(node);
+                return -EINVAL;
+        }
+
+        link_reset_statistics(link);
+
+        tipc_node_unlock(node);
+
+        return 0;
+}