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conf: support configuring mtu size in a virtual network

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Example:

  <network>
     ...
     <mtu size='9000'/>
     ...

If mtu is unset, it's assumed that we want the default for whatever is
the underlying transport (usually this is 1500).

This setting isn't yet wired in, so it will have no effect.

This partially resolves: https://bugzilla.redhat.com/1224348
This commit is contained in:
Laine Stump 2017-01-22 21:23:48 -05:00
parent dd8ac030fb
commit 68a42bf6f7
8 changed files with 83 additions and 5 deletions
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21
docs/formatnetwork.html.in
View File

@ -93,6 +93,7 @@
<pre>
...
&lt;bridge name="virbr0" stp="on" delay="5" macTableManager="libvirt"/&gt;
&lt;mtu size="9000"/&gt;
&lt;domain name="example.com" localOnly="no"/&gt;
&lt;forward mode="nat" dev="eth0"/&gt;
...</pre>
@ -151,9 +152,25 @@
<span class="since">Since 1.2.11, requires kernel 3.17 or
newer</span>
</p>
</dd>
<dt><code>mtu</code></dt>
<dd>
The <code>size</code> attribute of the <code>mtu></code>
element specifies the Maximum Transmission Unit (MTU) for the
network. <span class="since">Since 3.1.0</span>. In the case
of a libvirt-managed network (one with forward mode
of <code>nat</code>, <code>route</code>, <code>open</code>, or
no <code>forward</code> element (i.e. an isolated network),
this will be the MTU assigned to the bridge device when
libvirt creates it, and thereafter also assigned to all tap
devices created to connect guest interfaces. Network types not
specifically mentioned here don't support having an MTU set in
the libvirt network config. If mtu size is unspecified, the
default setting for the type of device being used is assumed
(usually 1500).
</dd>
<dt><code>domain</code></dt>
<dd>
The <code>name</code> attribute on the <code>domain</code>

5
docs/news.xml
View File

@ -36,10 +36,11 @@
</change>
<change>
<summary>
Introduce MTU to domain &lt;interface/&gt;
Introduce MTU to domain &lt;interface/&gt; and &lt;network&gt;
</summary>
<description>
Allow setting MTU size for some types of domain interface.
Allow setting MTU size for some types of domain interface
and network.
</description>
</change>
</section>

5
docs/schemas/network.rng
View File

@ -79,6 +79,11 @@
</element>
</optional>
<!-- <mtu> element -->
<optional>
<ref name="mtu"/>
</optional>
<!-- <mac> element -->
<optional>
<element name="mac">

31
src/conf/network_conf.c
View File

@ -2242,6 +2242,17 @@ virNetworkDefParseXML(xmlXPathContextPtr ctxt)
def->mac_specified = true;
}
tmp = virXPathString("string(./mtu/@size)", ctxt);
if (tmp) {
if (virStrToLong_ui(tmp, NULL, 10, &def->mtu) < 0) {
virReportError(VIR_ERR_XML_ERROR,
_("Invalid mtu size '%s' in network '%s'"),
tmp, def->name);
goto error;
}
}
VIR_FREE(tmp);
dnsNode = virXPathNode("./dns", ctxt);
if (dnsNode != NULL &&
virNetworkDNSDefParseXML(def->name, dnsNode, ctxt, &def->dns) < 0) {
@ -2435,7 +2446,9 @@ virNetworkDefParseXML(xmlXPathContextPtr ctxt)
case VIR_NETWORK_FORWARD_BRIDGE:
if (def->delay || stp) {
virReportError(VIR_ERR_XML_ERROR,
_("bridge delay/stp options only allowed in route, nat, and isolated mode, not in %s (network '%s')"),
_("bridge delay/stp options only allowed in "
"route, nat, and isolated mode, not in %s "
"(network '%s')"),
virNetworkForwardTypeToString(def->forward.type),
def->name);
goto error;
@ -2454,6 +2467,19 @@ virNetworkDefParseXML(xmlXPathContextPtr ctxt)
VIR_FREE(stp);
if (def->mtu &&
(def->forward.type != VIR_NETWORK_FORWARD_NONE &&
def->forward.type != VIR_NETWORK_FORWARD_NAT &&
def->forward.type != VIR_NETWORK_FORWARD_ROUTE &&
def->forward.type != VIR_NETWORK_FORWARD_OPEN)) {
virReportError(VIR_ERR_XML_ERROR,
_("mtu size only allowed in open, route, nat, "
"and isolated mode, not in %s (network '%s')"),
virNetworkForwardTypeToString(def->forward.type),
def->name);
goto error;
}
/* Extract custom metadata */
if ((metadataNode = virXPathNode("./metadata[1]", ctxt)) != NULL) {
def->metadata = xmlCopyNode(metadataNode, 1);
@ -2964,6 +2990,9 @@ virNetworkDefFormatBuf(virBufferPtr buf,
virBufferAddLit(buf, "/>\n");
}
if (def->mtu)
virBufferAsprintf(buf, "<mtu size='%u'/>\n", def->mtu);
if (def->mac_specified) {
char macaddr[VIR_MAC_STRING_BUFLEN];
virMacAddrFormat(&def->mac, macaddr);

1
src/conf/network_conf.h
View File

@ -240,6 +240,7 @@ struct _virNetworkDef {
int domainLocalOnly; /* enum virTristateBool: yes disables dns forwarding */
unsigned long delay; /* Bridge forward delay (ms) */
bool stp; /* Spanning tree protocol */
unsigned int mtu; /* MTU for bridge, 0 means "default" i.e. unset in config */
virMacAddr mac; /* mac address of bridge device */
bool mac_specified;

12
tests/networkxml2xmlin/set-mtu.xml Normal file
View File

@ -0,0 +1,12 @@
<network ipv6='no'>
<name>private</name>
<uuid>81ff0d90-c91e-6742-64da-4a736edb9a9b</uuid>
<bridge name='virbr2'/>
<mtu size='9000'/>
<mac address='52:54:00:17:3F:37'/>
<ip address="192.168.152.1" netmask="255.255.255.0">
<dhcp>
<range start="192.168.152.2" end="192.168.152.254"/>
</dhcp>
</ip>
</network>

12
tests/networkxml2xmlout/set-mtu.xml Normal file
View File

@ -0,0 +1,12 @@
<network>
<name>private</name>
<uuid>81ff0d90-c91e-6742-64da-4a736edb9a9b</uuid>
<bridge name='virbr2' stp='on' delay='0'/>
<mtu size='9000'/>
<mac address='52:54:00:17:3f:37'/>
<ip address='192.168.152.1' netmask='255.255.255.0'>
<dhcp>
<range start='192.168.152.2' end='192.168.152.254'/>
</dhcp>
</ip>
</network>

1
tests/networkxml2xmltest.c
View File

@ -158,6 +158,7 @@ mymain(void)
DO_TEST_PARSE_ERROR("hostdev-duplicate");
DO_TEST_PARSE_ERROR("passthrough-duplicate");
DO_TEST("metadata");
DO_TEST("set-mtu");
return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}