add support to change bond_xmit_hash_policy on linux bond devices

PVE/API2/Network.pm

@@ -81,6 +81,12 @@ my $confdesc = {
 	optional => 1,
 	type => 'string', enum => $bond_mode_enum,
     },
+    bond_xmit_hash_policy => {
+	description => "Selects the transmit hash policy to use for slave selection in balance-xor and 802.3ad modes.",
+	optional => 1,
+	type => 'string', 
+	enum => ['layer2', 'layer2+3', 'layer3+4' ],
+    },
     gateway => {
 	description => 'Default gateway address.',
 	type => 'string', format => 'ipv4',

www/manager/form/BondModeSelector.js

@@ -20,7 +20,7 @@ Ext.define('PVE.form.BondModeSelector', {
 		['active-backup', 'active-backup'], 
 		['balance-xor', 'balance-xor'], 
 		['broadcast', 'broadcast'], 
-		['802.3ad', 'LACP (layer2)'], 
+		['802.3ad', 'LACP (802.3ad)'], 
 		['balance-tlb', 'balance-tlb'], 
 		['balance-alb', 'balance-alb']
 	    ];
@@ -29,3 +29,20 @@ Ext.define('PVE.form.BondModeSelector', {
 	me.callParent();
     }
 });
+
+Ext.define('PVE.form.BondPolicySelector', {
+    extend: 'PVE.form.KVComboBox',
+    alias: ['widget.bondPolicySelector'],
+
+    initComponent: function() {
+	var me = this;
+        me.data = [
+	    ['layer2', 'layer2'],
+	    ['layer2+3', 'layer2+3'], 
+	    ['layer3+4', 'layer3+4']
+	];
+ 
+	me.callParent();
+    }
+});
+

www/manager/node/NetworkEdit.js

@@ -90,13 +90,35 @@ Ext.define('PVE.node.NetworkEdit', {
 		fieldLabel: gettext('Slaves'),
 		name: 'slaves'
 	    });
+
+	    var policySelector = Ext.createWidget('bondPolicySelector', {
+		fieldLabel: gettext('Hash policy'),
+		name: 'bond_xmit_hash_policy',
+		deleteEmpty: !me.create,
+		disabled: true
+	    });
+
 	    column2.push({
 		xtype: 'bondModeSelector',
 		fieldLabel: gettext('Mode'),
 		name: 'bond_mode',
 		value: me.create ? 'balance-rr' : undefined,
+		listeners: {
+		    change: function(f, value) {
+			if (value === 'balance-xor' ||
+			    value === '802.3ad') {
+			    policySelector.setDisabled(false);
+			} else {
+			    policySelector.setDisabled(true);
+			    policySelector.setValue('');
+			}
+		    }
+		},
 		allowBlank: false
 	    });
+
+	    column2.push(policySelector);
+
 	} else if (me.iftype === 'OVSBond') {
 	    column2.push({
 		xtype: me.create ? 'PVE.form.BridgeSelector' : 'displayfield',