From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Wolfgang Bumiller <w.bumiller@proxmox.com>
Date: Mon, 6 Apr 2020 12:16:37 +0200
Subject: [PATCH] PVE: [Up] qmp: add get_link_status

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
[FE: add get_link_status to command name exceptions]
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
---
 net/net.c        | 27 +++++++++++++++++++++++++++
 qapi/net.json    | 15 +++++++++++++++
 qapi/pragma.json |  2 ++
 3 files changed, 44 insertions(+)

diff --git a/net/net.c b/net/net.c
index 6492ad530e..33e901cba8 100644
--- a/net/net.c
+++ b/net/net.c
@@ -1397,6 +1397,33 @@ RxFilterInfoList *qmp_query_rx_filter(const char *name, Error **errp)
     return filter_list;
 }
 
+int64_t qmp_get_link_status(const char *name, Error **errp)
+{
+    NetClientState *ncs[MAX_QUEUE_NUM];
+    NetClientState *nc;
+    int queues;
+    bool ret;
+
+    queues = qemu_find_net_clients_except(name, ncs,
+                                          NET_CLIENT_DRIVER__MAX,
+                                          MAX_QUEUE_NUM);
+
+    if (queues == 0) {
+        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+                  "Device '%s' not found", name);
+        return (int64_t) -1;
+    }
+
+    nc = ncs[0];
+    ret = ncs[0]->link_down;
+
+    if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
+      ret = ncs[0]->peer->link_down;
+    }
+
+    return (int64_t) ret ? 0 : 1;
+}
+
 void colo_notify_filters_event(int event, Error **errp)
 {
     NetClientState *nc;
diff --git a/qapi/net.json b/qapi/net.json
index d6eb30008b..4fe71b149d 100644
--- a/qapi/net.json
+++ b/qapi/net.json
@@ -36,6 +36,21 @@
 ##
 { 'command': 'set_link', 'data': {'name': 'str', 'up': 'bool'} }
 
+##
+# @get_link_status:
+#
+# Get the current link state of the nics or nic.
+#
+# @name: name of the nic you get the state of
+#
+# Return: If link is up 1
+#         If link is down 0
+#         If an error occure an empty string.
+#
+# Notes: this is an Proxmox VE extension and not offical part of Qemu.
+##
+{ 'command': 'get_link_status', 'data': {'name': 'str'} , 'returns': 'int' }
+
 ##
 # @netdev_add:
 #
diff --git a/qapi/pragma.json b/qapi/pragma.json
index 7f810b0e97..29233db825 100644
--- a/qapi/pragma.json
+++ b/qapi/pragma.json
@@ -15,6 +15,7 @@
         'device_add',
         'device_del',
         'expire_password',
+        'get_link_status',
         'migrate_cancel',
         'netdev_add',
         'netdev_del',
@@ -26,6 +27,7 @@
         'system_wakeup' ],
     # Commands allowed to return a non-dictionary
     'command-returns-exceptions': [
+        'get_link_status',
         'human-monitor-command',
         'qom-get',
         'query-tpm-models',
