[libvirt] [PATCH 4/9] bridge_driver: Introduce networkBandwidthUpdate
Michal Privoznik
mprivozn at redhat.com
Mon Aug 3 06:39:34 UTC 2015
So, if a domain vNIC's bandwidth has been successfully set, it's
possible that because @floor is set on network's bridge, this
part may need updating too. And that's exactly what this function
does. While the previous commit introduced a function to check if
@floor can be satisfied, this does all the hard work. In general,
there may be three, well four possibilities:
1) No change in @floor value (either it remain unset, or its
value hasn't changed)
2) The @floor value has changed from a non-zero to a non-zero
value
3) New @floor is to be set
4) Old @floor must be cleared out
The difference between 2), 3) and 4) is, that while in 2) the QoS
tree on the network's bridge already has a special class for the
vNIC, in 3) the class must be created from scratch. In 4) it must
be removed. Fortunately, we have helpers for all three
interesting cases.
Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
src/network/bridge_driver.c | 160 ++++++++++++++++++++++++++++++++++++--------
src/network/bridge_driver.h | 10 +++
2 files changed, 142 insertions(+), 28 deletions(-)
diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index fa60ba4..5fad015 100644
--- a/src/network/bridge_driver.c
+++ b/src/network/bridge_driver.c
@@ -4792,38 +4792,17 @@ networkNextClassID(virNetworkObjPtr net)
return ret;
}
+
static int
-networkPlugBandwidth(virNetworkObjPtr net,
- virDomainNetDefPtr iface)
+networkPlugBandwidthImpl(virNetworkObjPtr net,
+ virDomainNetDefPtr iface,
+ virNetDevBandwidthPtr ifaceBand,
+ unsigned long long new_rate)
{
virNetworkDriverStatePtr driver = networkGetDriver();
- int ret = -1;
- int plug_ret;
- unsigned long long new_rate = 0;
ssize_t class_id = 0;
- char ifmac[VIR_MAC_STRING_BUFLEN];
- virNetDevBandwidthPtr ifaceBand = virDomainNetGetActualBandwidth(iface);
-
- if ((plug_ret = networkCheckBandwidth(net, ifaceBand, NULL,
- iface->mac, &new_rate)) < 0) {
- /* helper reported error */
- goto cleanup;
- }
-
- if (plug_ret > 0) {
- /* no QoS needs to be set; claim success */
- ret = 0;
- goto cleanup;
- }
-
- virMacAddrFormat(&iface->mac, ifmac);
- if (iface->type != VIR_DOMAIN_NET_TYPE_NETWORK ||
- !iface->data.network.actual) {
- virReportError(VIR_ERR_INTERNAL_ERROR,
- _("Cannot set bandwidth on interface '%s' of type %d"),
- ifmac, iface->type);
- goto cleanup;
- }
+ int plug_ret;
+ int ret = -1;
/* generate new class_id */
if ((class_id = networkNextClassID(net)) < 0) {
@@ -4859,6 +4838,46 @@ networkPlugBandwidth(virNetworkObjPtr net,
net->def->bridge);
ret = 0;
+ cleanup:
+ return ret;
+}
+
+
+static int
+networkPlugBandwidth(virNetworkObjPtr net,
+ virDomainNetDefPtr iface)
+{
+ int ret = -1;
+ int plug_ret;
+ unsigned long long new_rate = 0;
+ char ifmac[VIR_MAC_STRING_BUFLEN];
+ virNetDevBandwidthPtr ifaceBand = virDomainNetGetActualBandwidth(iface);
+
+ if ((plug_ret = networkCheckBandwidth(net, ifaceBand, NULL,
+ iface->mac, &new_rate)) < 0) {
+ /* helper reported error */
+ goto cleanup;
+ }
+
+ if (plug_ret > 0) {
+ /* no QoS needs to be set; claim success */
+ ret = 0;
+ goto cleanup;
+ }
+
+ virMacAddrFormat(&iface->mac, ifmac);
+ if (iface->type != VIR_DOMAIN_NET_TYPE_NETWORK ||
+ !iface->data.network.actual) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Cannot set bandwidth on interface '%s' of type %d"),
+ ifmac, iface->type);
+ goto cleanup;
+ }
+
+ if (networkPlugBandwidthImpl(net, iface, ifaceBand, new_rate) < 0)
+ goto cleanup;
+
+ ret = 0;
cleanup:
return ret;
@@ -4939,6 +4958,9 @@ networkBandwidthGenericChecks(virDomainNetDefPtr iface,
virNetDevBandwidthPtr ifaceBand = virDomainNetGetActualBandwidth(iface);
unsigned long long old_floor, new_floor;
+ if (!iface && !newBandwidth)
+ return false;
+
if (virDomainNetGetActualType(iface) != VIR_DOMAIN_NET_TYPE_NETWORK) {
/* This is not an interface that's plugged into a network.
* We don't care. Thus from our POV bandwidth change is allowed. */
@@ -4985,3 +5007,85 @@ networkBandwidthChangeAllowed(virDomainNetDefPtr iface,
virNetworkObjEndAPI(&network);
return ret;
}
+
+
+int
+networkBandwidthUpdate(virDomainNetDefPtr iface,
+ virNetDevBandwidthPtr newBandwidth)
+{
+ virNetworkDriverStatePtr driver = networkGetDriver();
+ virNetworkObjPtr network = NULL;
+ virNetDevBandwidthPtr ifaceBand = virDomainNetGetActualBandwidth(iface);
+ unsigned long long new_rate = 0;
+ int plug_ret;
+ int ret = -1;
+
+ if (!networkBandwidthGenericChecks(iface, newBandwidth))
+ return 0;
+
+ network = virNetworkObjFindByName(driver->networks, iface->data.network.name);
+ if (!network) {
+ virReportError(VIR_ERR_NO_NETWORK,
+ _("no network with matching name '%s'"),
+ iface->data.network.name);
+ return ret;
+ }
+
+ if ((plug_ret = networkCheckBandwidth(network, ifaceBand, NULL,
+ iface->mac, &new_rate)) < 0) {
+ /* helper reported error */
+ goto cleanup;
+ }
+
+ if (plug_ret > 0) {
+ /* no QoS needs to be set; claim success */
+ ret = 0;
+ goto cleanup;
+ }
+
+ /* Okay, there are three possible scenarios: */
+
+ if (ifaceBand->in && ifaceBand->in->floor &&
+ newBandwidth->in && newBandwidth->in->floor) {
+ /* Either we just need to update @floor .. */
+
+ if (virNetDevBandwidthUpdateRate(network->def->bridge,
+ iface->data.network.actual->class_id,
+ network->def->bandwidth,
+ newBandwidth->in->floor) < 0)
+ goto cleanup;
+
+ network->floor_sum -= ifaceBand->in->floor;
+ network->floor_sum += newBandwidth->in->floor;
+ new_rate -= network->floor_sum;
+
+ if (virNetDevBandwidthUpdateRate(network->def->bridge, 2,
+ network->def->bandwidth, new_rate) < 0 ||
+ virNetworkSaveStatus(driver->stateDir, network) < 0) {
+ /* Ouch, rollback */
+ network->floor_sum -= newBandwidth->in->floor;
+ network->floor_sum += ifaceBand->in->floor;
+
+ ignore_value(virNetDevBandwidthUpdateRate(network->def->bridge,
+ iface->data.network.actual->class_id,
+ network->def->bandwidth,
+ ifaceBand->in->floor));
+ goto cleanup;
+ }
+ } else if (newBandwidth->in && newBandwidth->in->floor) {
+ /* .. or we need to plug in new .. */
+
+ if (networkPlugBandwidthImpl(network, iface, newBandwidth, new_rate) < 0)
+ goto cleanup;
+ } else {
+ /* .. or unplug old. */
+
+ if (networkUnplugBandwidth(network, iface) < 0)
+ goto cleanup;
+ }
+
+ ret = 0;
+ cleanup:
+ virNetworkObjEndAPI(&network);
+ return ret;
+}
diff --git a/src/network/bridge_driver.h b/src/network/bridge_driver.h
index cce9237..3a9f22d 100644
--- a/src/network/bridge_driver.h
+++ b/src/network/bridge_driver.h
@@ -57,6 +57,9 @@ bool networkBandwidthChangeAllowed(virDomainNetDefPtr iface,
virNetDevBandwidthPtr newBandwidth)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
+int networkBandwidthUpdate(virDomainNetDefPtr iface,
+ virNetDevBandwidthPtr newBandwidth);
+
# else
/* Define no-op replacements that don't drag in any link dependencies. */
# define networkAllocateActualDevice(dom, iface) 0
@@ -85,6 +88,13 @@ networkBandwidthChangeAllowed(virDomainNetDefPtr iface ATTRIBUTE_UNUSED,
return true;
}
+static inline int
+networkBandwidthUpdate(virDomainNetDefPtr iface ATTRIBUTE_UNUSED,
+ virNetDevBandwidthPtr newBandwidth ATTRIBUTE_UNUSED)
+{
+ return 0;
+}
+
# endif
typedef char *(*networkDnsmasqLeaseFileNameFunc)(const char *netname);
--
2.4.6
More information about the libvir-list
mailing list