[libvirt] [PATCH v2 6/8] bandwidth: Create network bandwidth (un)plug functions
Michal Privoznik
mprivozn at redhat.com
Tue Dec 4 19:19:00 UTC 2012
Network should be notified if we plug in or unplug an
interface, so it can perform some action, e.g. set/unset
network part of QoS. However, we are doing this in very
early stage, so iface->ifname isn't filled in yet. So
whenever we want to report an error, we must use a different
identifier, e.g. the MAC address.
---
src/Makefile.am | 7 +-
src/conf/domain_conf.h | 1 +
src/conf/network_conf.c | 21 ++++
src/conf/network_conf.h | 4 +
src/libvirt_network.syms | 13 +++
src/libvirt_private.syms | 8 --
src/network/bridge_driver.c | 223 ++++++++++++++++++++++++++++++++++++++++++-
7 files changed, 266 insertions(+), 11 deletions(-)
create mode 100644 src/libvirt_network.syms
diff --git a/src/Makefile.am b/src/Makefile.am
index 01cb995..04378d1 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1373,6 +1373,10 @@ if WITH_ATOMIC_OPS_PTHREAD
USED_SYM_FILES += libvirt_atomic.syms
endif
+if WITH_NETWORK
+USED_SYM_FILES += libvirt_network.syms
+endif
+
EXTRA_DIST += \
libvirt_public.syms \
libvirt_private.syms \
@@ -1386,7 +1390,8 @@ EXTRA_DIST += \
libvirt_sasl.syms \
libvirt_vmx.syms \
libvirt_xenxs.syms \
- libvirt_libssh2.syms
+ libvirt_libssh2.syms \
+ libvirt_network.syms
GENERATED_SYM_FILES = libvirt.syms libvirt.def libvirt_qemu.def
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 4ab15e9..b4d149b 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -807,6 +807,7 @@ struct _virDomainActualNetDef {
virNetDevVPortProfilePtr virtPortProfile;
virNetDevBandwidthPtr bandwidth;
virNetDevVlan vlan;
+ unsigned int class_id; /* class ID for bandwidth 'floor' */
};
/* Stores the virtual network interface configuration */
diff --git a/src/conf/network_conf.c b/src/conf/network_conf.c
index 2cb9e81..441ccdc 100644
--- a/src/conf/network_conf.c
+++ b/src/conf/network_conf.c
@@ -47,6 +47,9 @@
#define MAX_BRIDGE_ID 256
#define VIR_FROM_THIS VIR_FROM_NETWORK
+#define NEXT_FREE_CLASS_ID 3
+/* currently, /sbin/tc implementation allows up 16 bits for minor class size */
+#define CLASS_ID_BITMAP_SIZE (1<<16)
VIR_ENUM_IMPL(virNetworkForward,
VIR_NETWORK_FORWARD_LAST,
@@ -319,10 +322,28 @@ virNetworkAssignDef(virNetworkObjListPtr nets,
virNetworkObjLock(network);
network->def = def;
+ if (!(network->class_id = virBitmapNew(CLASS_ID_BITMAP_SIZE))) {
+ virReportOOMError();
+ goto error;
+ }
+
+ if (virBitmapSetBit(network->class_id, 0) < 0 ||
+ virBitmapSetBit(network->class_id, 1) < 0 ||
+ virBitmapSetBit(network->class_id, 2) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("unable to initialize class id bitmap"));
+ goto error;
+ }
+
+ network->def = def;
nets->objs[nets->count] = network;
nets->count++;
return network;
+error:
+ virNetworkObjUnlock(network);
+ virNetworkObjFree(network);
+ return NULL;
}
diff --git a/src/conf/network_conf.h b/src/conf/network_conf.h
index 3e46304..20f8a51 100644
--- a/src/conf/network_conf.h
+++ b/src/conf/network_conf.h
@@ -38,6 +38,7 @@
# include "virnetdevvlan.h"
# include "virmacaddr.h"
# include "device_conf.h"
+# include "bitmap.h"
enum virNetworkForwardType {
VIR_NETWORK_FORWARD_NONE = 0,
@@ -221,6 +222,9 @@ struct _virNetworkObj {
virNetworkDefPtr def; /* The current definition */
virNetworkDefPtr newDef; /* New definition to activate at shutdown */
+
+ virBitmapPtr class_id; /* bitmap of class IDs for QoS */
+ unsigned long long floor_sum; /* sum of all 'floor'-s of attached NICs */
};
typedef struct _virNetworkObjList virNetworkObjList;
diff --git a/src/libvirt_network.syms b/src/libvirt_network.syms
new file mode 100644
index 0000000..fc8d415
--- /dev/null
+++ b/src/libvirt_network.syms
@@ -0,0 +1,13 @@
+#
+# Network-specific symbols
+#
+
+# virnetdevbandwidth.h
+virNetDevBandwidthClear;
+virNetDevBandwidthCopy;
+virNetDevBandwidthEqual;
+virNetDevBandwidthFree;
+virNetDevBandwidthSet;
+virNetDevBandwidthPlug;
+virNetDevBandwidthUnplug;
+virNetDevBandwidthUpdateRate;
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 41e2629..f5648a0 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1497,14 +1497,6 @@ virNetDevSetOnline;
virNetDevValidateConfig;
-# virnetdevbandwidth.h
-virNetDevBandwidthClear;
-virNetDevBandwidthCopy;
-virNetDevBandwidthEqual;
-virNetDevBandwidthFree;
-virNetDevBandwidthSet;
-
-
# virnetdevbridge.h
virNetDevBridgeAddPort;
virNetDevBridgeCreate;
diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index 63be5e2..15cbc87 100644
--- a/src/network/bridge_driver.c
+++ b/src/network/bridge_driver.c
@@ -121,6 +121,11 @@ static int networkShutdownNetworkExternal(struct network_driver *driver,
static void networkReloadIptablesRules(struct network_driver *driver);
static void networkRefreshDaemons(struct network_driver *driver);
+static int networkPlugBandwidth(virNetworkObjPtr net,
+ virDomainNetDefPtr iface);
+static int networkUnplugBandwidth(virNetworkObjPtr net,
+ virDomainNetDefPtr iface);
+
static struct network_driver *driverState = NULL;
static char *
@@ -3469,6 +3474,7 @@ networkAllocateActualDevice(virDomainNetDefPtr iface)
enum virDomainNetType actualType = iface->type;
virNetworkObjPtr network = NULL;
virNetworkDefPtr netdef = NULL;
+ virNetDevBandwidthPtr bandwidth = NULL;
virPortGroupDefPtr portgroup = NULL;
virNetDevVPortProfilePtr virtport = iface->virtPortProfile;
virNetDevVlanPtr vlan = NULL;
@@ -3507,7 +3513,13 @@ networkAllocateActualDevice(virDomainNetDefPtr iface)
* (already in NetDef). Otherwise, if there is bandwidth info in
* the portgroup, fill that into the ActualDef.
*/
- if (portgroup && !iface->bandwidth) {
+
+ if (iface->bandwidth)
+ bandwidth = iface->bandwidth;
+ else if (portgroup && portgroup->bandwidth)
+ bandwidth = portgroup->bandwidth;
+
+ if (bandwidth) {
if (!iface->data.network.actual
&& (VIR_ALLOC(iface->data.network.actual) < 0)) {
virReportOOMError();
@@ -3515,7 +3527,7 @@ networkAllocateActualDevice(virDomainNetDefPtr iface)
}
if (virNetDevBandwidthCopy(&iface->data.network.actual->bandwidth,
- portgroup->bandwidth) < 0)
+ bandwidth) < 0)
goto error;
}
@@ -3528,6 +3540,10 @@ networkAllocateActualDevice(virDomainNetDefPtr iface)
*/
if (iface->data.network.actual)
iface->data.network.actual->type = VIR_DOMAIN_NET_TYPE_NETWORK;
+
+ if (networkPlugBandwidth(network, iface) < 0)
+ goto error;
+
} else if ((netdef->forwardType == VIR_NETWORK_FORWARD_BRIDGE) &&
netdef->bridge) {
@@ -4039,6 +4055,12 @@ networkReleaseActualDevice(virDomainNetDefPtr iface)
}
netdef = network->def;
+ if ((netdef->forwardType == VIR_NETWORK_FORWARD_NONE ||
+ netdef->forwardType == VIR_NETWORK_FORWARD_NAT ||
+ netdef->forwardType == VIR_NETWORK_FORWARD_ROUTE) &&
+ networkUnplugBandwidth(network, iface) < 0)
+ goto error;
+
if ((!iface->data.network.actual) ||
((actualType != VIR_DOMAIN_NET_TYPE_DIRECT) &&
(actualType != VIR_DOMAIN_NET_TYPE_HOSTDEV))) {
@@ -4242,3 +4264,200 @@ cleanup:
error:
goto cleanup;
}
+
+/**
+ * networkCheckBandwidth:
+ * @net: network QoS
+ * @iface: interface QoS
+ * @new_rate: new rate for non guaranteed class
+ *
+ * Returns: -1 if plugging would overcommit network QoS
+ * 0 if plugging is safe (@new_rate updated)
+ * 1 if no QoS is set (@new_rate untouched)
+ */
+static int
+networkCheckBandwidth(virNetworkObjPtr net,
+ virDomainNetDefPtr iface,
+ unsigned long long *new_rate)
+{
+ int ret = -1;
+ virNetDevBandwidthPtr netBand = net->def->bandwidth;
+ virNetDevBandwidthPtr ifaceBand = iface->bandwidth;
+ unsigned long long tmp_floor_sum = net->floor_sum;
+ unsigned long long tmp_new_rate = 0;
+ char ifmac[VIR_MAC_STRING_BUFLEN];
+
+ if (!ifaceBand || !ifaceBand->in || !ifaceBand->in->floor ||
+ !netBand || !netBand->in)
+ return 1;
+
+ virMacAddrFormat(&iface->mac, ifmac);
+
+ tmp_new_rate = netBand->in->average;
+ tmp_floor_sum += ifaceBand->in->floor;
+
+ /* check against peak */
+ if (netBand->in->peak) {
+ tmp_new_rate = netBand->in->peak;
+ if (tmp_floor_sum > netBand->in->peak) {
+ virReportError(VIR_ERR_OPERATION_INVALID,
+ _("Cannot plug '%s' interface into '%s' because it "
+ "would overcommit 'peak' on network '%s'"),
+ ifmac,
+ net->def->bridge,
+ net->def->name);
+ goto cleanup;
+ }
+ } else if (tmp_floor_sum > netBand->in->average) {
+ /* tmp_floor_sum can be between 'average' and 'peak' iff 'peak' is set.
+ * Otherwise, tmp_floor_sum must be below 'average'. */
+ virReportError(VIR_ERR_OPERATION_INVALID,
+ _("Cannot plug '%s' interface into '%s' because it "
+ "would overcommit 'average' on network '%s'"),
+ ifmac,
+ net->def->bridge,
+ net->def->name);
+ goto cleanup;
+ }
+
+ *new_rate = tmp_new_rate;
+ ret = 0;
+
+cleanup:
+ return ret;
+}
+
+/**
+ * networkNextClassID:
+ * @net: network object
+ *
+ * Find next free class ID. @net is supposed
+ * to be locked already. If there is a free ID,
+ * it is marked as used and returned.
+ *
+ * Returns next free class ID or -1 if none is available.
+ */
+static ssize_t
+networkNextClassID(virNetworkObjPtr net)
+{
+ size_t ret = 0;
+ bool is_set = false;
+
+ while (virBitmapGetBit(net->class_id, ret, &is_set) == 0 && is_set)
+ ret++;
+
+ if (is_set || virBitmapSetBit(net->class_id, ret) < 0)
+ return -1;
+
+ return ret;
+}
+
+static int
+networkPlugBandwidth(virNetworkObjPtr net,
+ virDomainNetDefPtr iface)
+{
+ int ret = -1;
+ int plug_ret;
+ unsigned long long new_rate = 0;
+ ssize_t class_id = 0;
+ char ifmac[VIR_MAC_STRING_BUFLEN];
+
+ /* XXX iface->ifname is not filled in, it gets allocated later,
+ * but not in this function. Use MAC in error messages instead */
+ if ((plug_ret = networkCheckBandwidth(net, iface, &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;
+ }
+
+ /* generate new class_id */
+ if ((class_id = networkNextClassID(net)) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Could not generate next class ID"));
+ goto cleanup;
+ }
+
+ plug_ret = virNetDevBandwidthPlug(net->def->bridge,
+ net->def->bandwidth,
+ &iface->mac,
+ iface->bandwidth,
+ class_id);
+ if (plug_ret < 0) {
+ ignore_value(virNetDevBandwidthUnplug(net->def->bridge, class_id));
+ goto cleanup;
+ }
+
+ if (plug_ret > 0) {
+ /* Well, this is embarrassing. The networkCheckBandwidth helper
+ * says we need to set a QoS, but virNetDevBandwidthPlug says
+ * we don't need to. It's almost certainly a bug then. */
+ VIR_WARN("Something strange happened. You may want to upgrade libvirt");
+ ret = 0;
+ goto cleanup;
+ }
+
+ /* QoS was set, generate new class ID */
+ iface->data.network.actual->class_id = class_id;
+ /* update sum of 'floor'-s of attached NICs */
+ net->floor_sum += iface->bandwidth->in->floor;
+ /* update rate for non guaranteed NICs */
+ new_rate -= net->floor_sum;
+ if (virNetDevBandwidthUpdateRate(net->def->bridge, "1:2",
+ net->def->bandwidth, new_rate) < 0)
+ VIR_WARN("Unable to update rate for 1:2 class on %s bridge",
+ net->def->bridge);
+
+ ret = 0;
+
+cleanup:
+ return ret;
+}
+
+static int
+networkUnplugBandwidth(virNetworkObjPtr net,
+ virDomainNetDefPtr iface)
+{
+ int ret = 0;
+ unsigned long long new_rate;
+
+ if (iface->data.network.actual &&
+ iface->data.network.actual->class_id) {
+ /* we must remove class from bridge */
+ new_rate = net->def->bandwidth->in->average;
+
+ if (net->def->bandwidth->in->peak > 0)
+ new_rate = net->def->bandwidth->in->peak;
+
+ ret = virNetDevBandwidthUnplug(net->def->bridge,
+ iface->data.network.actual->class_id);
+ if (ret < 0)
+ goto cleanup;
+ /* update sum of 'floor'-s of attached NICs */
+ net->floor_sum -= iface->bandwidth->in->floor;
+ /* update rate for non guaranteed NICs */
+ new_rate -= net->floor_sum;
+ if (virNetDevBandwidthUpdateRate(net->def->bridge, "1:2",
+ net->def->bandwidth, new_rate) < 0)
+ VIR_WARN("Unable to update rate for 1:2 class on %s bridge",
+ net->def->bridge);
+ /* no class is associated any longer */
+ iface->data.network.actual->class_id = 0;
+ }
+
+cleanup:
+ return ret;
+}
--
1.7.8.6
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