Re: [libvirt] [PATCH] qemu : support persistent add/delete network interface

>From 226239905ec9b01fd0bd0ce050de97d7f0d9e19c Mon Sep 17 00:00:00 2001 From: KAMEZAWA Hiroyuki <kamezawa.hiroyu(a)jp.fujitsu.com&gt; Date: Wed, 18 May 2011 15:14:28 +0900 Subject: [PATCH] qemu - support persistent add/delete network interface This patch allows to modify interfaces of domain(qemu). Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu(a)jp.fujitsu.com&gt; * src/conf/domain_conf.c: (virDomainNetInsert) : Insert a network device to domain definition. (virDomainNetIndexByMac/Ifname) : Returns an index of net device in array. (virDomainNetRemoveByMac): Remove a NIC of passed MAC address. * src/qemu/qemu_driver.c (qemuDomainAttachDeviceConfig): add codes for NIC. (qemuDomainDetachDeviceConfig): add codes for NIC. --- src/conf/domain_conf.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++ src/conf/domain_conf.h | 5 ++++ src/libvirt_private.syms | 4 +++ src/qemu/qemu_driver.c | 32 ++++++++++++++++++++++++++ 4 files changed, 96 insertions(+), 0 deletions(-) diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 498438a..de9abe9 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -5163,6 +5163,61 @@ int virDomainDiskRemoveByName(virDomainDefPtr def, const char *name) return 0; } +int virDomainNetInsert(virDomainDefPtr def, virDomainNetDefPtr net) +{ + if (VIR_REALLOC_N(def->nets, def->nnets) < 0)

+ return -1; + def->nets[def->nnets] = net; + def->nnets++; + return 0; +} + +int virDomainNetIndexByMac(virDomainDefPtr def, const unsigned char *mac) +{ + int i; + + for (i = 0; i < def->nnets; i++) + if (!memcmp(def->nets[i]->mac, mac, VIR_MAC_BUFLEN)) + return i; + return -1; +} + +int virDomainNetIndexByIfname(virDomainDefPtr def, const char *name) +{ + int i; + + for (i = 0; i < def->nnets; i++) + if (def->nets[i]->ifname && STREQ(def->nets[i]->ifname, name)) + return i; + return -1; +} + +static void virDomainNetRemove(virDomainDefPtr def, size_t i) +{ + if (def->nnets > 1) { + memmove(def->nets + i, + def->nets + i + 1, + sizeof(*def->nets) * (def->nnets - (i + 1))); + def->nnets--; + if (VIR_REALLOC_N(def->nets, def->nnets) < 0) { + /* ignore harmless */ + } + } else { + VIR_FREE(def->nets); + def->nnets = 0; + } +} + +int virDomainNetRemoveByMac(virDomainDefPtr def, const unsigned char *mac) +{ + int i = virDomainNetIndexByMac(def, mac); + + if (i < 0) + return -1; + virDomainNetRemove(def, i); + return 0; +} + int virDomainControllerInsert(virDomainDefPtr def, virDomainControllerDefPtr controller) diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h index fe42f21..274e22b 100644 --- a/src/conf/domain_conf.h +++ b/src/conf/domain_conf.h @@ -1359,6 +1359,11 @@ int virDomainDiskDefAssignAddress(virCapsPtr caps, virDomainDiskDefPtr def); void virDomainDiskRemove(virDomainDefPtr def, size_t i); int virDomainDiskRemoveByName(virDomainDefPtr def, const char *name); +int virDomainNetIndexByMac(virDomainDefPtr def, const unsigned char *mac); +int virDomainNetIndexByIfname(virDomainDefPtr def, const char *iface); +int virDomainNetInsert(virDomainDefPtr def, virDomainNetDefPtr net); +int virDomainNetRemoveByMac(virDomainDefPtr def, const unsigned char *mac); + int virDomainControllerInsert(virDomainDefPtr def, virDomainControllerDefPtr controller); void virDomainControllerInsertPreAlloced(virDomainDefPtr def, diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index 7b6151c..2695c2e 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -290,6 +290,10 @@ virDomainLoadAllConfigs; virDomainMemballoonModelTypeFromString; virDomainMemballoonModelTypeToString; virDomainNetDefFree; +virDomainNetIndexByIfname; +virDomainNetIndexByMac; +virDomainNetInsert; +virDomainNetRemoveByMac; virDomainNetTypeToString; virDomainObjAssignDef; virDomainObjCopyPersistentDef; diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index fdb3b30..0a547eb 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -4245,6 +4245,7 @@ qemuDomainAttachDeviceConfig(virDomainDefPtr vmdef, virDomainDeviceDefPtr dev) { virDomainDiskDefPtr disk; + virDomainNetDefPtr net; switch (dev->type) { case VIR_DOMAIN_DEVICE_DISK: @@ -4267,6 +4268,28 @@ qemuDomainAttachDeviceConfig(virDomainDefPtr vmdef, return -1; break; + case VIR_DOMAIN_DEVICE_NET: + net = dev->data.net; + if (net->ifname && virDomainNetIndexByIfname(vmdef, net->ifname)) {

+ qemuReportError(VIR_ERR_INVALID_ARG, + _("iface %s already exists"), net->ifname); + return -1; + } + if (virDomainNetIndexByMac(vmdef, net->mac) >= 0) { + char macbuf[VIR_MAC_STRING_BUFLEN]; + virFormatMacAddr(net->mac, macbuf); + qemuReportError(VIR_ERR_INVALID_ARG, + _("mac %s already exists"), macbuf); + return -1; + } + if (virDomainNetInsert(vmdef, net)) { + virReportOOMError(); + return -1; + } + dev->data.net = NULL; + if (qemuDomainAssignPCIAddresses(vmdef) < 0) + return -1; + break; default: qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s", _("persistent attach of device is not supported")); @@ -4281,6 +4304,7 @@ qemuDomainDetachDeviceConfig(virDomainDefPtr vmdef, virDomainDeviceDefPtr dev) { virDomainDiskDefPtr disk; + virDomainNetDefPtr net; switch (dev->type) { case VIR_DOMAIN_DEVICE_DISK: @@ -4291,6 +4315,14 @@ qemuDomainDetachDeviceConfig(virDomainDefPtr vmdef, return -1; } break; + case VIR_DOMAIN_DEVICE_NET: + net = dev->data.net; + if (virDomainNetRemoveByMac(vmdef, net->mac)) { + qemuReportError(VIR_ERR_INVALID_ARG, + _("no target device %s"), disk->dst);

+ return -1; + } + break; default: qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s", _("persistent detach of device is not supported"));