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370608b4c7
This patch creates two bitmaps, one for macvlan device names and one for macvtap. The bitmap position is used to indicate that libvirt is currently using a device with the name macvtap%d/macvlan%d, where %d is the position in the bitmap. When requested to create a new macvtap/macvlan device, libvirt will now look for the first clear bit in the appropriate bitmap and derive the device name from that rather than just starting at 0 and counting up until one works. When libvirtd is restarted, the qemu driver code that reattaches to active domains calls the appropriate function to "re-reserve" the device names as it is scanning the status of running domains. Note that it may seem strange that the retry counter now starts at 8191 instead of 5. This is because we now don't do a "pre-check" for the existence of a device once we've reserved it in the bitmap - we move straight to creating it; although very unlikely, it's possible that someone has a running system where they have a large number of network devices *created outside libvirt* named "macvtap%d" or "macvlan%d" - such a setup would still allow creating more devices with the old code, while a low retry max in the new code would cause a failure. Since the objective of the retry max is just to prevent an infinite loop, and it's highly unlikely to do more than 1 iteration anyway, having a high max is a reasonable concession in order to prevent lots of new failures.
110 lines
4.7 KiB
C
110 lines
4.7 KiB
C
/*
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* Copyright (C) 2011, 2013, 2016 Red Hat, Inc.
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* Copyright (C) 2010 IBM Corporation
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Authors:
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* Stefan Berger <stefanb@us.ibm.com>
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*/
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#ifndef __UTIL_MACVTAP_H__
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# define __UTIL_MACVTAP_H__
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# include "internal.h"
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# include "virmacaddr.h"
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# include "virsocketaddr.h"
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# include "virnetdevbandwidth.h"
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# include "virnetdevvportprofile.h"
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/* the mode type for macvtap devices */
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typedef enum {
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VIR_NETDEV_MACVLAN_MODE_VEPA,
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VIR_NETDEV_MACVLAN_MODE_PRIVATE,
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VIR_NETDEV_MACVLAN_MODE_BRIDGE,
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VIR_NETDEV_MACVLAN_MODE_PASSTHRU,
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VIR_NETDEV_MACVLAN_MODE_LAST,
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} virNetDevMacVLanMode;
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VIR_ENUM_DECL(virNetDevMacVLanMode)
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typedef enum {
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VIR_NETDEV_MACVLAN_CREATE_NONE = 0,
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/* Create with a tap device */
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VIR_NETDEV_MACVLAN_CREATE_WITH_TAP = 1 << 0,
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/* Bring the interface up */
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VIR_NETDEV_MACVLAN_CREATE_IFUP = 1 << 1,
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/* Enable VNET_HDR */
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VIR_NETDEV_MACVLAN_VNET_HDR = 1 << 2,
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} virNetDevMacVLanCreateFlags;
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int virNetDevMacVLanReserveName(const char *name, bool quietfail);
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int virNetDevMacVLanReleaseName(const char *name);
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int virNetDevMacVLanCreate(const char *ifname,
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const char *type,
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const virMacAddr *macaddress,
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const char *srcdev,
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uint32_t macvlan_mode,
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int *retry)
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ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4)
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ATTRIBUTE_RETURN_CHECK;
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int virNetDevMacVLanDelete(const char *ifname)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
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int virNetDevMacVLanCreateWithVPortProfile(const char *ifname,
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const virMacAddr *macaddress,
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const char *linkdev,
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virNetDevMacVLanMode mode,
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const unsigned char *vmuuid,
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virNetDevVPortProfilePtr virtPortProfile,
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char **res_ifname,
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virNetDevVPortProfileOp vmop,
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char *stateDir,
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int *tapfd,
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size_t tapfdSize,
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unsigned int flags)
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ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(5)
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ATTRIBUTE_NONNULL(7) ATTRIBUTE_NONNULL(9) ATTRIBUTE_RETURN_CHECK;
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int virNetDevMacVLanDeleteWithVPortProfile(const char *ifname,
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const virMacAddr *macaddress,
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const char *linkdev,
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int mode,
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virNetDevVPortProfilePtr virtPortProfile,
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char *stateDir)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3)
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ATTRIBUTE_NONNULL(6) ATTRIBUTE_RETURN_CHECK;
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int virNetDevMacVLanRestartWithVPortProfile(const char *cr_ifname,
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const virMacAddr *macaddress,
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const char *linkdev,
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const unsigned char *vmuuid,
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virNetDevVPortProfilePtr virtPortProfile,
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virNetDevVPortProfileOp vmOp)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3)
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ATTRIBUTE_NONNULL(4) ATTRIBUTE_RETURN_CHECK;
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int virNetDevMacVLanVPortProfileRegisterCallback(const char *ifname,
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const virMacAddr *macaddress,
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const char *linkdev,
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const unsigned char *vmuuid,
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virNetDevVPortProfilePtr virtPortProfile,
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virNetDevVPortProfileOp vmOp)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3)
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ATTRIBUTE_NONNULL(4) ATTRIBUTE_RETURN_CHECK;
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#endif /* __UTIL_MACVTAP_H__ */
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