[libvirt] [PATCH 3/4] Allow creation of plain macvlan devices
Daniel P. Berrange
berrange at redhat.com
Thu Nov 10 11:28:36 UTC 2011
From: "Daniel P. Berrange" <berrange at redhat.com>
Update virNetDevMacVLanCreateWithVPortProfile to allow creation
of plain macvlan devices, as well as macvtap devices. The former
is useful for LXC containers
* src/qemu/qemu_command.c: Explicitly request a macvtap device
* src/util/virnetdevmacvlan.c, src/util/virnetdevmacvlan.h: Add
new flag to allow switching between macvlan and macvtap
creation
---
src/qemu/qemu_command.c | 2 +-
src/util/virnetdevmacvlan.c | 41 ++++++++++++++++++++++++++++-------------
src/util/virnetdevmacvlan.h | 5 +++--
3 files changed, 32 insertions(+), 16 deletions(-)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 6df1f83..2f01436 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -154,7 +154,7 @@ qemuPhysIfaceConnect(virDomainDefPtr def,
net->ifname, net->mac,
virDomainNetGetActualDirectDev(net),
virDomainNetGetActualDirectMode(net),
- vnet_hdr, def->uuid,
+ true, vnet_hdr, def->uuid,
virDomainNetGetActualDirectVirtPortProfile(net),
&res_ifname,
vmop, driver->stateDir,
diff --git a/src/util/virnetdevmacvlan.c b/src/util/virnetdevmacvlan.c
index fe2f383..98b0f9a 100644
--- a/src/util/virnetdevmacvlan.c
+++ b/src/util/virnetdevmacvlan.c
@@ -72,11 +72,14 @@ VIR_ENUM_IMPL(virNetDevMacVLanMode, VIR_NETDEV_MACVLAN_MODE_LAST,
# define MACVTAP_NAME_PREFIX "macvtap"
# define MACVTAP_NAME_PATTERN "macvtap%d"
+# define MACVLAN_NAME_PREFIX "macvlan"
+# define MACVLAN_NAME_PATTERN "macvlan%d"
+
/**
* virNetDevMacVLanCreate:
*
* @ifname: The name the interface is supposed to have; optional parameter
- * @type: The type of device, i.e., "macvtap"
+ * @type: The type of device, i.e., "macvtap", "macvlan"
* @macaddress: The MAC address of the device
* @srcdev: The name of the 'link' device
* @macvlan_mode: The macvlan mode to use
@@ -458,14 +461,14 @@ static const uint32_t modeMap[VIR_NETDEV_MACVLAN_MODE_LAST] = {
* interface will be stored into if everything succeeded. It is up
* to the caller to free the string.
*
- * Returns file descriptor of the tap device in case of success,
- * negative value otherwise with error reported.
- *
+ * Returns file descriptor of the tap device in case of success with @withTap,
+ * otherwise returns 0; returns -1 on error.
*/
int virNetDevMacVLanCreateWithVPortProfile(const char *tgifname,
const unsigned char *macaddress,
const char *linkdev,
enum virNetDevMacVLanMode mode,
+ bool withTap,
int vnet_hdr,
const unsigned char *vmuuid,
virNetDevVPortProfilePtr virtPortProfile,
@@ -474,7 +477,9 @@ int virNetDevMacVLanCreateWithVPortProfile(const char *tgifname,
char *stateDir,
virNetDevBandwidthPtr bandwidth)
{
- const char *type = "macvtap";
+ const char *type = withTap ? "macvtap" : "macvlan";
+ const char *prefix = withTap ? MACVTAP_NAME_PREFIX : MACVLAN_NAME_PREFIX;
+ const char *pattern = withTap ? MACVTAP_NAME_PATTERN : MACVLAN_NAME_PATTERN;
int c, rc;
char ifname[IFNAMSIZ];
int retries, do_retry = 0;
@@ -505,8 +510,7 @@ int virNetDevMacVLanCreateWithVPortProfile(const char *tgifname,
return -1;
if (ret) {
- if (STRPREFIX(tgifname,
- MACVTAP_NAME_PREFIX)) {
+ if (STRPREFIX(tgifname, prefix)) {
goto create_name;
}
virReportSystemError(EEXIST,
@@ -522,7 +526,7 @@ int virNetDevMacVLanCreateWithVPortProfile(const char *tgifname,
create_name:
retries = 5;
for (c = 0; c < 8192; c++) {
- snprintf(ifname, sizeof(ifname), MACVTAP_NAME_PATTERN, c);
+ snprintf(ifname, sizeof(ifname), pattern, c);
if ((ret = virNetDevExists(ifname)) < 0)
return -1;
if (!ret) {
@@ -553,15 +557,26 @@ create_name:
goto disassociate_exit;
}
- rc = virNetDevMacVLanTapOpen(cr_ifname, 10);
- if (rc >= 0) {
+ if (withTap) {
+ if ((rc = virNetDevMacVLanTapOpen(cr_ifname, 10)) < 0)
+ goto disassociate_exit;
+
if (virNetDevMacVLanTapSetup(rc, vnet_hdr) < 0) {
VIR_FORCE_CLOSE(rc); /* sets rc to -1 */
goto disassociate_exit;
}
- *res_ifname = strdup(cr_ifname);
- } else
- goto disassociate_exit;
+ if (!(*res_ifname = strdup(cr_ifname))) {
+ VIR_FORCE_CLOSE(rc); /* sets rc to -1 */
+ virReportOOMError();
+ goto disassociate_exit;
+ }
+ } else {
+ if (!(*res_ifname = strdup(cr_ifname))) {
+ virReportOOMError();
+ goto disassociate_exit;
+ }
+ rc = 0;
+ }
if (virNetDevBandwidthSet(cr_ifname, bandwidth) < 0) {
virNetDevError(VIR_ERR_INTERNAL_ERROR,
diff --git a/src/util/virnetdevmacvlan.h b/src/util/virnetdevmacvlan.h
index 73918b8..130ecea 100644
--- a/src/util/virnetdevmacvlan.h
+++ b/src/util/virnetdevmacvlan.h
@@ -55,6 +55,7 @@ int virNetDevMacVLanCreateWithVPortProfile(const char *ifname,
const unsigned char *macaddress,
const char *linkdev,
enum virNetDevMacVLanMode mode,
+ bool withTap,
int vnet_hdr,
const unsigned char *vmuuid,
virNetDevVPortProfilePtr virtPortProfile,
@@ -62,8 +63,8 @@ int virNetDevMacVLanCreateWithVPortProfile(const char *ifname,
enum virNetDevVPortProfileOp vmop,
char *stateDir,
virNetDevBandwidthPtr bandwidth)
- ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(6)
- ATTRIBUTE_NONNULL(8) ATTRIBUTE_NONNULL(10) ATTRIBUTE_RETURN_CHECK;
+ ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(7)
+ ATTRIBUTE_NONNULL(9) ATTRIBUTE_NONNULL(11) ATTRIBUTE_RETURN_CHECK;
int virNetDevMacVLanDeleteWithVPortProfile(const char *ifname,
const unsigned char *macaddress,
--
1.7.6.4
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