Re: [PATCHv2 3/5] netdevmacvlan: Use helper function to create unique macvlan/macvtap name

Simplify ReserveName/GenerateName for macvlan and macvtap by using common functions. Signed-off-by: Shi Lei <shi_lei(a)massclouds.com&gt; --- src/libvirt_private.syms | 1 - src/lxc/lxc_process.c | 2 +- src/qemu/qemu_process.c | 2 +- src/util/virnetdevmacvlan.c | 177 +++++------------------------------- src/util/virnetdevmacvlan.h | 14 +-- 5 files changed, 26 insertions(+), 170 deletions(-)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index 64ef01e1..4d6ae84b 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -2655,7 +2655,6 @@ virNetDevMacVLanDelete; virNetDevMacVLanDeleteWithVPortProfile; virNetDevMacVLanIsMacvtap; virNetDevMacVLanModeTypeFromString; -virNetDevMacVLanReserveName; virNetDevMacVLanRestartWithVPortProfile; virNetDevMacVLanTapOpen; virNetDevMacVLanTapSetup; diff --git a/src/lxc/lxc_process.c b/src/lxc/lxc_process.c index 0f818e2e..eb29431e 100644 --- a/src/lxc/lxc_process.c +++ b/src/lxc/lxc_process.c @@ -1641,7 +1641,7 @@ virLXCProcessReconnectNotifyNets(virDomainDefPtr def) * impolite. */ if (virDomainNetGetActualType(net) == VIR_DOMAIN_NET_TYPE_DIRECT) - virNetDevMacVLanReserveName(net->ifname); + virNetDevReserveName(net->ifname); if (net->type == VIR_DOMAIN_NET_TYPE_NETWORK) { if (!conn && !(conn = virGetConnectNetwork())) diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c index 1d54f201..6244ade4 100644 --- a/src/qemu/qemu_process.c +++ b/src/qemu/qemu_process.c @@ -3390,7 +3390,7 @@ qemuProcessNotifyNets(virDomainDefPtr def) */ switch (virDomainNetGetActualType(net)) { case VIR_DOMAIN_NET_TYPE_DIRECT: - virNetDevMacVLanReserveName(net->ifname); + virNetDevReserveName(net->ifname); break; case VIR_DOMAIN_NET_TYPE_BRIDGE: case VIR_DOMAIN_NET_TYPE_NETWORK: diff --git a/src/util/virnetdevmacvlan.c b/src/util/virnetdevmacvlan.c index 72f0d670..36b13133 100644 --- a/src/util/virnetdevmacvlan.c +++ b/src/util/virnetdevmacvlan.c @@ -45,7 +45,6 @@ VIR_ENUM_IMPL(virNetDevMacVLanMode, # include <net/if.h> # include <linux/if_tun.h> -# include <math.h> # include "viralloc.h" # include "virlog.h" @@ -59,129 +58,6 @@ VIR_ENUM_IMPL(virNetDevMacVLanMode, VIR_LOG_INIT("util.netdevmacvlan"); -# define VIR_NET_GENERATED_MACVTAP_PATTERN VIR_NET_GENERATED_MACVTAP_PREFIX "%d" -# define VIR_NET_GENERATED_MACVLAN_PATTERN VIR_NET_GENERATED_MACVLAN_PREFIX "%d" -# define VIR_NET_GENERATED_PREFIX \ - ((flags & VIR_NETDEV_MACVLAN_CREATE_WITH_TAP) ? \ - VIR_NET_GENERATED_MACVTAP_PREFIX : VIR_NET_GENERATED_MACVLAN_PREFIX) - - -virMutex virNetDevMacVLanCreateMutex = VIR_MUTEX_INITIALIZER; -static int virNetDevMacVTapLastID = -1; -static int virNetDevMacVLanLastID = -1; - - -static void -virNetDevMacVLanReserveNameInternal(const char *name) -{ - unsigned int id; - const char *idstr = NULL; - int *lastID = NULL; - int len; - - if (STRPREFIX(name, VIR_NET_GENERATED_MACVTAP_PREFIX)) { - lastID = &virNetDevMacVTapLastID; - len = strlen(VIR_NET_GENERATED_MACVTAP_PREFIX); - } else if (STRPREFIX(name, VIR_NET_GENERATED_MACVLAN_PREFIX)) { - lastID = &virNetDevMacVTapLastID; - len = strlen(VIR_NET_GENERATED_MACVLAN_PREFIX); - } else { - return; - } - - VIR_INFO("marking device in use: '%s'", name); - - idstr = name + len; - - if (virStrToLong_ui(idstr, NULL, 10, &id) >= 0) { - if (*lastID < (int)id) - *lastID = id; - } -} - - -/** - * virNetDevMacVLanReserveName: - * @name: name of an existing macvtap/macvlan device - * - * Set the value of virNetDevMacV(Lan|Tap)LastID to assure that any - * new device created with an autogenerated name will use a number - * higher than the number in the given device name. - * - * Returns nothing. - */ -void -virNetDevMacVLanReserveName(const char *name) -{ - virMutexLock(&virNetDevMacVLanCreateMutex); - virNetDevMacVLanReserveNameInternal(name); - virMutexUnlock(&virNetDevMacVLanCreateMutex); -} - - -/** - * virNetDevMacVLanGenerateName: - * @ifname: pointer to pointer to string containing template - * @lastID: counter to add to the template to form the name - * - * generate a new (currently unused) name for a new macvtap/macvlan - * device based on the template string in @ifname - replace %d with - * ++(*counter), and keep trying new values until one is found - * that doesn't already exist, or we've tried 10000 different - * names. Once a usable name is found, replace the template with the - * actual name. - * - * Returns 0 on success, -1 on failure. - */ -static int -virNetDevMacVLanGenerateName(char **ifname, unsigned int flags) -{ - const char *prefix; - const char *iftemplate; - int *lastID; - int id; - double maxIDd; - int maxID = INT_MAX; - int attempts = 0; - - if (flags & VIR_NETDEV_MACVLAN_CREATE_WITH_TAP) { - prefix = VIR_NET_GENERATED_MACVTAP_PREFIX; - iftemplate = VIR_NET_GENERATED_MACVTAP_PREFIX "%d"; - lastID = &virNetDevMacVTapLastID; - } else { - prefix = VIR_NET_GENERATED_MACVLAN_PREFIX; - iftemplate = VIR_NET_GENERATED_MACVLAN_PREFIX "%d"; - lastID = &virNetDevMacVLanLastID; - } - - maxIDd = pow(10, IFNAMSIZ - 1 - strlen(prefix)); - if (maxIDd <= (double)INT_MAX) - maxID = (int)maxIDd; - - do { - g_autofree char *try = NULL; - - id = ++(*lastID); - - /* reset before overflow */ - if (*lastID == maxID) - *lastID = -1; - - try = g_strdup_printf(iftemplate, id); - - if (!virNetDevExists(try)) { - g_free(*ifname); - *ifname = g_steal_pointer(&try); - return 0; - } - } while (++attempts < 10000); - - virReportError(VIR_ERR_INTERNAL_ERROR, - _("no unused %s names available"), - *ifname); - return -1; -} - /** * virNetDevMacVLanIsMacvtap: @@ -209,13 +85,10 @@ virNetDevMacVLanIsMacvtap(const char *ifname) * virNetDevMacVLanCreate: * * @ifname: The name the interface is supposed to have; optional parameter - * @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 - * @retry: Pointer to integer that will be '1' upon return if an interface - * with the same name already exists and it is worth to try - * again with a different name + * @flags: OR of virNetDevMacVLanCreateFlags. * * Create a macvtap device with the given properties. * @@ -223,19 +96,21 @@ virNetDevMacVLanIsMacvtap(const char *ifname) */ int virNetDevMacVLanCreate(const char *ifname, - const char *type, const virMacAddr *macaddress, const char *srcdev, - uint32_t macvlan_mode) + uint32_t macvlan_mode, + unsigned int flags) { int error = 0; int ifindex = 0; + const char *type = (flags & VIR_NETDEV_MACVLAN_CREATE_WITH_TAP) ? + VIR_NET_GENERATED_MACVTAP_PREFIX : + VIR_NET_GENERATED_MACVLAN_PREFIX; virNetlinkNewLinkData data = { .macvlan_mode = &macvlan_mode, .mac = macaddress, }; - if (virNetDevGetIndex(srcdev, &ifindex) < 0) return -1; @@ -795,7 +670,6 @@ virNetDevMacVLanCreateWithVPortProfile(const char *ifnameRequested, size_t tapfdSize, unsigned int flags) { - const char *type = VIR_NET_GENERATED_PREFIX; g_autofree char *ifname = NULL; uint32_t macvtapMode; int vf = -1; @@ -832,8 +706,6 @@ virNetDevMacVLanCreateWithVPortProfile(const char *ifnameRequested, return -1; } - virMutexLock(&virNetDevMacVLanCreateMutex); - if (ifnameRequested) { int rc; bool isAutoName > @@ -842,10 +714,8 @@ virNetDevMacVLanCreateWithVPortProfile(const

VIR_INFO("Requested macvtap device name: %s", ifnameRequested); - if ((rc = virNetDevExists(ifnameRequested)) < 0) { - virMutexUnlock(&virNetDevMacVLanCreateMutex); + if ((rc = virNetDevExists(ifnameRequested)) < 0) return -1; - } if (rc) { /* ifnameRequested is already being used */ @@ -854,17 +724,16 @@ virNetDevMacVLanCreateWithVPortProfile(const char *ifnameRequested, virReportSystemError(EEXIST, _("Unable to create device '%s'"), ifnameRequested); - virMutexUnlock(&virNetDevMacVLanCreateMutex); return -1; } } else { /* ifnameRequested is available. try to open it */ - virNetDevMacVLanReserveNameInternal(ifnameRequested); + virNetDevReserveName(ifnameRequested); - if (virNetDevMacVLanCreate(ifnameRequested, type, macaddress, - linkdev, macvtapMode) == 0) { + if (virNetDevMacVLanCreate(ifnameRequested, macaddress, + linkdev, macvtapMode, flags) == 0) { /* virNetDevMacVLanCreate() was successful - use this name */ ifname = g_strdup(ifnameRequested); @@ -874,7 +743,6 @@ virNetDevMacVLanCreateWithVPortProfile(const char *ifnameRequested, * autogenerated named, so there is nothing else to * try - fail and return. */ - virMutexUnlock(&virNetDevMacVLanCreateMutex); return -1; } } @@ -885,16 +753,19 @@ virNetDevMacVLanCreateWithVPortProfile(const char *ifnameRequested, * autogenerated name, so now we look for an unused * autogenerated name. */ - if (virNetDevMacVLanGenerateName(&ifname, flags) < 0 || - virNetDevMacVLanCreate(ifname, type, macaddress, - linkdev, macvtapMode) < 0) { - virMutexUnlock(&virNetDevMacVLanCreateMutex); + virNetDevGenNameType type; + if (flags & VIR_NETDEV_MACVLAN_CREATE_WITH_TAP) + type = VIR_NET_DEV_GEN_NAME_MACVTAP; + else + type = VIR_NET_DEV_GEN_NAME_MACVLAN; + + if (virNetDevGenerateName(&ifname, type) < 0 || + virNetDevMacVLanCreate(ifname, macaddress, + linkdev, macvtapMode, flags) < 0) return -1; - } } /* all done creating the device */ - virMutexUnlock(&virNetDevMacVLanCreateMutex); if (virNetDevVPortProfileAssociate(ifname, virtPortProfile, @@ -1050,10 +921,10 @@ bool virNetDevMacVLanIsMacvtap(const char *ifname G_GNUC_UNUSED) } int virNetDevMacVLanCreate(const char *ifname G_GNUC_UNUSED, - const char *type G_GNUC_UNUSED, const virMacAddr *macaddress G_GNUC_UNUSED, const char *srcdev G_GNUC_UNUSED, - uint32_t macvlan_mode G_GNUC_UNUSED) + uint32_t macvlan_mode G_GNUC_UNUSED, + unsigned int fflags G_GNUC_UNUSED) { virReportSystemError(ENOSYS, "%s", _("Cannot create macvlan devices on this platform")); @@ -1141,10 +1012,4 @@ int virNetDevMacVLanVPortProfileRegisterCallback(const char *ifname G_GNUC_UNUSE _("Cannot create macvlan devices on this platform")); return -1; } - -void virNetDevMacVLanReserveName(const char *name G_GNUC_UNUSED) -{ - virReportSystemError(ENOSYS, "%s", - _("Cannot create macvlan devices on this platform")); -} #endif /* ! WITH_LIBNL */ diff --git a/src/util/virnetdevmacvlan.h b/src/util/virnetdevmacvlan.h index 48800a8f..0a013fc2 100644 --- a/src/util/virnetdevmacvlan.h +++ b/src/util/virnetdevmacvlan.h @@ -48,23 +48,15 @@ typedef enum { VIR_NETDEV_MACVLAN_VNET_HDR = 1 << 2, } virNetDevMacVLanCreateFlags; -/* libvirt will start macvtap/macvlan interface names with one of - * these prefixes when it auto-generates the name - */ -#define VIR_NET_GENERATED_MACVTAP_PREFIX "macvtap" -#define VIR_NET_GENERATED_MACVLAN_PREFIX "macvlan" - -void virNetDevMacVLanReserveName(const char *name); - bool virNetDevMacVLanIsMacvtap(const char *ifname) ATTRIBUTE_NONNULL(1) G_GNUC_WARN_UNUSED_RESULT G_GNUC_NO_INLINE; int virNetDevMacVLanCreate(const char *ifname, - const char *type, const virMacAddr *macaddress, const char *srcdev, - uint32_t macvlan_mode) - ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4) + uint32_t macvlan_mode, + unsigned int flags) + ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) G_GNUC_WARN_UNUSED_RESULT; int virNetDevMacVLanDelete(const char *ifname)