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bandwidth: Create network bandwidth (un)plug functions

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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.
This commit is contained in:
Michal Privoznik 2012-11-16 14:29:01 +01:00
parent b697411ca0
commit 07d1b6b5b1
5 changed files with 236 additions and 2 deletions
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1
src/conf/domain_conf.h
View File

@ -809,6 +809,7 @@ struct _virDomainActualNetDef {
virNetDevVPortProfilePtr virtPortProfile;
virNetDevBandwidthPtr bandwidth;
virNetDevVlan vlan;
unsigned int class_id; /* class ID for bandwidth 'floor' */
};
/* Stores the virtual network interface configuration */

18
src/conf/network_conf.c
View File

@ -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 to 16 bits for minor class size */
#define CLASS_ID_BITMAP_SIZE (1<<16)
VIR_ENUM_IMPL(virNetworkForward,
VIR_NETWORK_FORWARD_LAST,
@ -340,10 +343,25 @@ virNetworkAssignDef(virNetworkObjListPtr nets,
virNetworkObjLock(network);
network->def = def;
if (!(network->class_id = virBitmapNew(CLASS_ID_BITMAP_SIZE))) {
virReportOOMError();
goto error;
}
/* The first three class IDs are already taken */
ignore_value(virBitmapSetBit(network->class_id, 0));
ignore_value(virBitmapSetBit(network->class_id, 1));
ignore_value(virBitmapSetBit(network->class_id, 2));
network->def = def;
nets->objs[nets->count] = network;
nets->count++;
return network;
error:
virNetworkObjUnlock(network);
virNetworkObjFree(network);
return NULL;
}

4
src/conf/network_conf.h
View File

@ -38,6 +38,7 @@
# include "virnetdevvlan.h"
# include "virmacaddr.h"
# include "device_conf.h"
# include "bitmap.h"
enum virNetworkForwardType {
VIR_NETWORK_FORWARD_NONE = 0,
@ -232,6 +233,9 @@ 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;

3
src/libvirt_private.syms
View File

@ -1508,7 +1508,10 @@ virNetDevBandwidthClear;
virNetDevBandwidthCopy;
virNetDevBandwidthEqual;
virNetDevBandwidthFree;
virNetDevBandwidthPlug;
virNetDevBandwidthSet;
virNetDevBandwidthUnplug;
virNetDevBandwidthUpdateRate;
# virnetdevbridge.h

212
src/network/bridge_driver.c
View File

@ -122,6 +122,11 @@ 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 *
@ -3683,6 +3688,7 @@ 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;
@ -3721,7 +3727,13 @@ 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();
@ -3729,7 +3741,7 @@ networkAllocateActualDevice(virDomainNetDefPtr iface)
}
if (virNetDevBandwidthCopy(&iface->data.network.actual->bandwidth,
portgroup->bandwidth) < 0)
bandwidth) < 0)
goto error;
}
@ -3742,6 +3754,10 @@ 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->forward.type == VIR_NETWORK_FORWARD_BRIDGE) &&
netdef->bridge) {
@ -4253,6 +4269,12 @@ networkReleaseActualDevice(virDomainNetDefPtr iface)
}
netdef = network->def;
if ((netdef->forward.type == VIR_NETWORK_FORWARD_NONE ||
netdef->forward.type == VIR_NETWORK_FORWARD_NAT ||
netdef->forward.type == 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))) {
@ -4456,3 +4478,189 @@ 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];
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;
}
/* 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;
}