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util: combine bools in virNetDevTapCreateInBridgePort into flags

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With an additional new bool added to determine whether or not to
discourage the use of the supplied MAC address by the bridge itself,
virNetDevTapCreateInBridgePort had three booleans (well, 2 bools and
an int used as a bool) in the arg list, which made it increasingly
difficult to follow what was going on. This patch combines those three
into a single flags arg, which not only shortens the arg list, but
makes it more self-documenting.
This commit is contained in:
Laine Stump 2012-03-01 15:35:30 -05:00
parent c1b164d70c
commit d1c310231d
5 changed files with 54 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
src/network/bridge_driver.c
View File

@ -1766,7 +1766,8 @@ networkStartNetworkVirtual(struct network_driver *driver,
}
if (virNetDevTapCreateInBridgePort(network->def->bridge,
&macTapIfName, network->def->mac,
false, 0, false, NULL, NULL) < 0) {
NULL, NULL,
VIR_NETDEV_TAP_CREATE_USE_MAC_FOR_BRIDGE) < 0) {
VIR_FREE(macTapIfName);
goto err0;
}

13
src/qemu/qemu_command.c
View File

@ -178,7 +178,7 @@ qemuNetworkIfaceConnect(virDomainDefPtr def,
char *brname = NULL;
int err;
int tapfd = -1;
int vnet_hdr = 0;
unsigned int tap_create_flags = VIR_NETDEV_TAP_CREATE_IFUP;
bool template_ifname = false;
int actualType = virDomainNetGetActualType(net);
@ -240,12 +240,13 @@ qemuNetworkIfaceConnect(virDomainDefPtr def,
}
if (qemuCapsGet(qemuCaps, QEMU_CAPS_VNET_HDR) &&
net->model && STREQ(net->model, "virtio"))
vnet_hdr = 1;
net->model && STREQ(net->model, "virtio")) {
tap_create_flags |= VIR_NETDEV_TAP_CREATE_VNET_HDR;
}
err = virNetDevTapCreateInBridgePort(brname, &net->ifname, net->mac, true,
vnet_hdr, true, &tapfd,
virDomainNetGetActualVirtPortProfile(net));
err = virNetDevTapCreateInBridgePort(brname, &net->ifname, net->mac, &tapfd,
virDomainNetGetActualVirtPortProfile(net),
tap_create_flags);
virDomainAuditNetDevice(def, net, "/dev/net/tun", tapfd >= 0);
if (err < 0) {
if (template_ifname)

8
src/uml/uml_conf.c
View File

@ -1,7 +1,7 @@
/*
* uml_conf.c: UML driver configuration
*
* Copyright (C) 2006-2011 Red Hat, Inc.
* Copyright (C) 2006-2012 Red Hat, Inc.
* Copyright (C) 2006 Daniel P. Berrange
*
* This library is free software; you can redistribute it and/or
@ -138,9 +138,9 @@ umlConnectTapDevice(virConnectPtr conn,
template_ifname = true;
}
if (virNetDevTapCreateInBridgePort(bridge, &net->ifname, net->mac, true,
0, true, NULL,
virDomainNetGetActualVirtPortProfile(net)) < 0) {
if (virNetDevTapCreateInBridgePort(bridge, &net->ifname, net->mac, NULL,
virDomainNetGetActualVirtPortProfile(net),
VIR_NETDEV_TAP_CREATE_IFUP) < 0) {
if (template_ifname)
VIR_FREE(net->ifname);
goto error;

46
src/util/virnetdevtap.c
View File

@ -107,22 +107,25 @@ virNetDevProbeVnetHdr(int tapfd)
#ifdef TUNSETIFF
/**
* brCreateTap:
* virNetDevTapCreate:
* @ifname: the interface name
* @vnet_hr: whether to try enabling IFF_VNET_HDR
* @tapfd: file descriptor return value for the new tap device
* @flags: OR of virNetDevTapCreateFlags. Only one flag is recognized:
*
* VIR_NETDEV_TAP_CREATE_VNET_HDR
* - Enable IFF_VNET_HDR on the tap device
*
* Creates a tap interface.
* If the @tapfd parameter is supplied, the open tap device file
* descriptor will be returned, otherwise the TAP device will be made
* persistent and closed. The caller must use brDeleteTap to remove
* a persistent TAP devices when it is no longer needed.
* persistent and closed. The caller must use virNetDevTapDelete to
* remove a persistent TAP devices when it is no longer needed.
*
* Returns 0 in case of success or an errno code in case of failure.
*/
int virNetDevTapCreate(char **ifname,
int vnet_hdr ATTRIBUTE_UNUSED,
int *tapfd)
int *tapfd,
unsigned int flags ATTRIBUTE_UNUSED)
{
int fd;
struct ifreq ifr;
@ -139,7 +142,8 @@ int virNetDevTapCreate(char **ifname,
ifr.ifr_flags = IFF_TAP|IFF_NO_PI;
# ifdef IFF_VNET_HDR
if (vnet_hdr && virNetDevProbeVnetHdr(fd))
if ((flags & VIR_NETDEV_TAP_CREATE_VNET_HDR) &&
virNetDevProbeVnetHdr(fd))
ifr.ifr_flags |= IFF_VNET_HDR;
# endif
@ -228,8 +232,8 @@ cleanup:
}
#else /* ! TUNSETIFF */
int virNetDevTapCreate(char **ifname ATTRIBUTE_UNUSED,
int vnet_hdr ATTRIBUTE_UNUSED,
int *tapfd ATTRIBUTE_UNUSED)
int *tapfd ATTRIBUTE_UNUSED,
unsigned int flags ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Unable to create TAP devices on this platform"));
@ -249,17 +253,23 @@ int virNetDevTapDelete(const char *ifname ATTRIBUTE_UNUSED)
* @brname: the bridge name
* @ifname: the interface name (or name template)
* @macaddr: desired MAC address (VIR_MAC_BUFLEN long)
* @discourage: whether bridge should be discouraged from using macaddr
* @vnet_hdr: whether to try enabling IFF_VNET_HDR
* @tapfd: file descriptor return value for the new tap device
* @virtPortProfile: bridge/port specific configuration
* @flags: OR of virNetDevTapCreateFlags:
* VIR_NETDEV_TAP_CREATE_IFUP
* - Bring the interface up
* VIR_NETDEV_TAP_CREATE_VNET_HDR
* - Enable IFF_VNET_HDR on the tap device
* VIR_NETDEV_TAP_CREATE_USE_MAC_FOR_BRIDGE
* - Set this interface's MAC as the bridge's MAC address
*
* This function creates a new tap device on a bridge. @ifname can be either
* a fixed name or a name template with '%d' for dynamic name allocation.
* in either case the final name for the bridge will be stored in @ifname.
* If the @tapfd parameter is supplied, the open tap device file
* descriptor will be returned, otherwise the TAP device will be made
* persistent and closed. The caller must use brDeleteTap to remove
* persistent and closed. The caller must use virNetDevTapDelete to remove
* a persistent TAP devices when it is no longer needed.
*
* Returns 0 in case of success or -1 on failure
@ -267,15 +277,13 @@ int virNetDevTapDelete(const char *ifname ATTRIBUTE_UNUSED)
int virNetDevTapCreateInBridgePort(const char *brname,
char **ifname,
const unsigned char *macaddr,
bool discourage,
int vnet_hdr,
bool up,
int *tapfd,
virNetDevVPortProfilePtr virtPortProfile)
virNetDevVPortProfilePtr virtPortProfile,
unsigned int flags)
{
unsigned char tapmac[VIR_MAC_BUFLEN];
if (virNetDevTapCreate(ifname, vnet_hdr, tapfd) < 0)
if (virNetDevTapCreate(ifname, tapfd, flags) < 0)
return -1;
/* We need to set the interface MAC before adding it
@ -285,7 +293,7 @@ int virNetDevTapCreateInBridgePort(const char *brname,
* device before we set our static MAC.
*/
memcpy(tapmac, macaddr, VIR_MAC_BUFLEN);
if (discourage)
if (!(flags & VIR_NETDEV_TAP_CREATE_USE_MAC_FOR_BRIDGE))
tapmac[0] = 0xFE; /* Discourage bridge from using TAP dev MAC */
if (virNetDevSetMAC(*ifname, tapmac) < 0)
@ -308,7 +316,7 @@ int virNetDevTapCreateInBridgePort(const char *brname,
goto error;
}
if (virNetDevSetOnline(*ifname, up) < 0)
if (virNetDevSetOnline(*ifname, !!(flags & VIR_NETDEV_TAP_CREATE_IFUP)) < 0)
goto error;
return 0;

20
src/util/virnetdevtap.h
View File

@ -27,21 +27,29 @@
# include "virnetdevvportprofile.h"
int virNetDevTapCreate(char **ifname,
int vnet_hdr,
int *tapfd)
int *tapfd,
unsigned int flags)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevTapDelete(const char *ifname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
typedef enum {
VIR_NETDEV_TAP_CREATE_NONE = 0,
/* Bring the interface up */
VIR_NETDEV_TAP_CREATE_IFUP = 1 << 0,
/* Enable IFF_VNET_HDR on the tap device */
VIR_NETDEV_TAP_CREATE_VNET_HDR = 1 << 1,
/* Set this interface's MAC as the bridge's MAC address */
VIR_NETDEV_TAP_CREATE_USE_MAC_FOR_BRIDGE = 1 << 2,
} virNetDevTapCreateFlags;
int virNetDevTapCreateInBridgePort(const char *brname,
char **ifname,
const unsigned char *macaddr,
bool discourage,
int vnet_hdr,
bool up,
int *tapfd,
virNetDevVPortProfilePtr virtPortProfile)
virNetDevVPortProfilePtr virtPortProfile,
unsigned int flags)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3)
ATTRIBUTE_RETURN_CHECK;