[libvirt] [PATCHv4 2/3] openvswitch: Add utility functions for getting and setting Open vSwitch per-port data

From: Kyle Mestery <kmestery(a)cisco.com&gt; Add utility functions for Open vSwitch to both save per-port data before a live migration, and restore the per-port data after a live migration. Signed-off-by: Kyle Mestery <kmestery(a)cisco.com&gt; --- src/libvirt_private.syms | 2 ++ src/util/virnetdevopenvswitch.c | 70 +++++++++++++++++++++++++++++++++++++++++ src/util/virnetdevopenvswitch.h | 6 ++++ 3 files changed, 78 insertions(+) diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index 60f9c7f..699c9a3 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -1500,7 +1500,9 @@ virNetDevMacVLanVPortProfileRegisterCallback; # virnetdevopenvswitch.h virNetDevOpenvswitchAddPort; +virNetDevOpenvswitchGetMigrateData; virNetDevOpenvswitchRemovePort; +virNetDevOpenvswitchSetMigrateData; # virnetdevtap.h diff --git a/src/util/virnetdevopenvswitch.c b/src/util/virnetdevopenvswitch.c index a6993b6..841f693 100644 --- a/src/util/virnetdevopenvswitch.c +++ b/src/util/virnetdevopenvswitch.c @@ -179,3 +179,73 @@ int virNetDevOpenvswitchRemovePort(const char *brname ATTRIBUTE_UNUSED, const ch virCommandFree(cmd); return ret; } + +/** + * virNetDevOpenvswitchGetMigrateData: + * @migrate: a pointer to store the data into, allocated by this function + * @ifname: name of the interface for which data is being migrated + * + * Allocates data to be migrated specific to Open vSwitch + * + * Returns 0 in case of success or -1 in case of failure + */ +int virNetDevOpenvswitchGetMigrateData(char **migrate, const char *ifname) +{ + virCommandPtr cmd = NULL; + int ret = 0; + + cmd = virCommandNewArgList(OVSVSCTL, "--timeout=5", "get", "Interface", + ifname, "external_ids:PortData", NULL); + + virCommandSetOutputBuffer(cmd, migrate); + + /* Run the command */ + if (virCommandRun(cmd, NULL) < 0) { + virReportSystemError(VIR_ERR_INTERNAL_ERROR, + _("Unable to run command to get OVS port data for " + "interface %s"), ifname); + ret = -1; + goto error; + } + + /* Wipeout the newline */ + (*migrate)[strlen(*migrate) - 1] = '\0'; + +error: + return ret; +} + +/** + * virNetDevOpenvswitchSetMigrateData: + * @migrate: the data which was transferred during migration + * @ifname: the name of the interface the data is associated with + * + * Repopulates OVS per-port data on destination host + * + * Returns 0 in case of success or -1 in case of failure + */ +int virNetDevOpenvswitchSetMigrateData(char *migrate, const char *ifname) +{ + virCommandPtr cmd = NULL; + int ret = 0; + virBufferPtr buf; + + if (VIR_ALLOC(buf) < 0) { + ret = -1; + goto error; + } + + virBufferAsprintf(buf, "external_ids:PortData=%s", migrate); + + cmd = virCommandNewArgList(OVSVSCTL, "--timeout=5", "set", "Interface", ifname, + virBufferCurrentContent(buf), NULL); + /* Run the command */ + if ((ret = virCommandRun(cmd, NULL)) < 0) { + virReportSystemError(VIR_ERR_INTERNAL_ERROR, + _("Unable to run command to set OVS port data for " + "interface %s"), ifname); + } + +error: + return ret; +} diff --git a/src/util/virnetdevopenvswitch.h b/src/util/virnetdevopenvswitch.h index 7e5b618..147cd6f 100644 --- a/src/util/virnetdevopenvswitch.h +++ b/src/util/virnetdevopenvswitch.h @@ -42,4 +42,10 @@ int virNetDevOpenvswitchAddPort(const char *brname, int virNetDevOpenvswitchRemovePort(const char *brname, const char *ifname) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK; +int virNetDevOpenvswitchGetMigrateData(char **migrate, const char *ifname) + ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK; + +int virNetDevOpenvswitchSetMigrateData(char *migrate, const char *ifname) + ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK; + #endif /* __VIR_NETDEV_OPENVSWITCH_H__ */ -- 1.7.11.7