[libvirt] [PATCH 04/14] Factor qemuBuildHostNetStr() out from qemuBuildCommandLine()
Mark McLoughlin
markmc at redhat.com
Mon Jul 20 11:51:14 UTC 2009
Re-factor this code so that it can be used for NIC hotplug
too. The awkward prefix and type_sep arguments are needed to
allow us to do "host_net_add tap vlan=..."
* src/qemu_conf.c: factor the net backend string formatting
code into its own function
---
src/qemu_conf.c | 233 +++++++++++++++++++++++++++++--------------------------
1 files changed, 122 insertions(+), 111 deletions(-)
diff --git a/src/qemu_conf.c b/src/qemu_conf.c
index 679dac3..ba99652 100644
--- a/src/qemu_conf.c
+++ b/src/qemu_conf.c
@@ -740,40 +740,34 @@ int qemudExtractVersion(virConnectPtr conn,
}
-static char *
+static int
qemudNetworkIfaceConnect(virConnectPtr conn,
struct qemud_driver *driver,
- int **tapfds,
- int *ntapfds,
virDomainNetDefPtr net,
- int vlan,
int vnet_hdr)
{
char *brname;
- char tapfdstr[4+3+32+7];
- char *retval = NULL;
int err;
int tapfd = -1;
if (net->type == VIR_DOMAIN_NET_TYPE_NETWORK) {
virNetworkPtr network = virNetworkLookupByName(conn,
net->data.network.name);
- if (!network) {
- goto error;
- }
+ if (!network)
+ return -1;
+
brname = virNetworkGetBridgeName(network);
virNetworkFree(network);
- if (brname == NULL) {
- goto error;
- }
+ if (brname == NULL)
+ return -1;
} else if (net->type == VIR_DOMAIN_NET_TYPE_BRIDGE) {
brname = net->data.bridge.brname;
} else {
qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
_("Network type %d is not supported"), net->type);
- goto error;
+ return -1;
}
if (!net->ifname ||
@@ -782,7 +776,7 @@ qemudNetworkIfaceConnect(virConnectPtr conn,
VIR_FREE(net->ifname);
if (!(net->ifname = strdup("vnet%d"))) {
virReportOOMError(conn);
- goto error;
+ return -1;
}
}
@@ -791,7 +785,7 @@ qemudNetworkIfaceConnect(virConnectPtr conn,
qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
_("cannot initialize bridge support: %s"),
virStrerror(err, ebuf, sizeof ebuf));
- goto error;
+ return -1;
}
if ((err = brAddTap(driver->brctl, brname,
@@ -807,30 +801,10 @@ qemudNetworkIfaceConnect(virConnectPtr conn,
"to bridge '%s' : %s"),
net->ifname, brname, virStrerror(err, ebuf, sizeof ebuf));
}
- goto error;
+ return -1;
}
- snprintf(tapfdstr, sizeof(tapfdstr),
- "tap,fd=%d,vlan=%d",
- tapfd, vlan);
-
- if (!(retval = strdup(tapfdstr)))
- goto no_memory;
-
- if (VIR_REALLOC_N(*tapfds, (*ntapfds)+1) < 0)
- goto no_memory;
-
- (*tapfds)[(*ntapfds)++] = tapfd;
-
- return retval;
-
- no_memory:
- virReportOOMError(conn);
- error:
- VIR_FREE(retval);
- if (tapfd != -1)
- close(tapfd);
- return NULL;
+ return tapfd;
}
static int
@@ -858,6 +832,96 @@ qemuBuildNicStr(virConnectPtr conn,
return 0;
}
+static int
+qemuBuildHostNetStr(virConnectPtr conn,
+ virDomainNetDefPtr net,
+ const char *prefix,
+ char type_sep,
+ int vlan,
+ int tapfd,
+ char **str)
+{
+ switch (net->type) {
+ case VIR_DOMAIN_NET_TYPE_NETWORK:
+ case VIR_DOMAIN_NET_TYPE_BRIDGE:
+ if (virAsprintf(str, "%stap%cfd=%d,vlan=%d",
+ prefix ? prefix : "",
+ type_sep, tapfd, vlan) < 0) {
+ virReportOOMError(conn);
+ return -1;
+ }
+ break;
+
+ case VIR_DOMAIN_NET_TYPE_ETHERNET:
+ {
+ virBuffer buf = VIR_BUFFER_INITIALIZER;
+
+ if (prefix)
+ virBufferAdd(&buf, prefix, strlen(prefix));
+ virBufferAddLit(&buf, "tap");
+ if (net->ifname) {
+ virBufferVSprintf(&buf, "%cifname=%s", type_sep, net->ifname);
+ type_sep = ',';
+ }
+ if (net->data.ethernet.script) {
+ virBufferVSprintf(&buf, "%cscript=%s", type_sep,
+ net->data.ethernet.script);
+ type_sep = ',';
+ }
+ virBufferVSprintf(&buf, "%cvlan=%d", type_sep, vlan);
+ if (virBufferError(&buf)) {
+ virReportOOMError(conn);
+ return -1;
+ }
+
+ *str = virBufferContentAndReset(&buf);
+ }
+ break;
+
+ case VIR_DOMAIN_NET_TYPE_CLIENT:
+ case VIR_DOMAIN_NET_TYPE_SERVER:
+ case VIR_DOMAIN_NET_TYPE_MCAST:
+ {
+ const char *mode = NULL;
+
+ switch (net->type) {
+ case VIR_DOMAIN_NET_TYPE_CLIENT:
+ mode = "connect";
+ break;
+ case VIR_DOMAIN_NET_TYPE_SERVER:
+ mode = "listen";
+ break;
+ case VIR_DOMAIN_NET_TYPE_MCAST:
+ mode = "mcast";
+ break;
+ }
+
+ if (virAsprintf(str, "%ssocket%c%s=%s:%d,vlan=%d",
+ prefix ? prefix : "",
+ type_sep, mode,
+ net->data.socket.address,
+ net->data.socket.port,
+ vlan) < 0) {
+ virReportOOMError(conn);
+ return -1;
+ }
+ }
+ break;
+
+ case VIR_DOMAIN_NET_TYPE_USER:
+ default:
+ if (virAsprintf(str, "%suser%cvlan=%d",
+ prefix ? prefix : "",
+ type_sep, vlan) < 0) {
+ virReportOOMError(conn);
+ return -1;
+ }
+ break;
+ }
+
+ return 0;
+}
+
static int qemudBuildCommandLineChrDevStr(virDomainChrDefPtr dev,
char *buf,
int buflen)
@@ -1388,95 +1452,42 @@ int qemudBuildCommandLine(virConnectPtr conn,
ADD_ARG_LIT("-net");
ADD_ARG_LIT("none");
} else {
- int vlan = 0;
for (i = 0 ; i < def->nnets ; i++) {
virDomainNetDefPtr net = def->nets[i];
- char *nic;
+ char *nic, *host;
+ int tapfd = -1;
- if (qemuBuildNicStr(conn, net, NULL, ',', vlan, &nic) < 0)
+ if (qemuBuildNicStr(conn, net, NULL, ',', i, &nic) < 0)
goto error;
ADD_ARG_LIT("-net");
ADD_ARG(nic);
- ADD_ARG_LIT("-net");
- switch (net->type) {
- case VIR_DOMAIN_NET_TYPE_NETWORK:
- case VIR_DOMAIN_NET_TYPE_BRIDGE:
- {
- char *tap;
- int vnet_hdr = 0;
-
- if (qemuCmdFlags & QEMUD_CMD_FLAG_VNET_HDR &&
- net->model && STREQ(net->model, "virtio"))
- vnet_hdr = 1;
-
- tap = qemudNetworkIfaceConnect(conn, driver,
- tapfds, ntapfds,
- net, vlan, vnet_hdr);
- if (tap == NULL)
- goto error;
- ADD_ARG(tap);
- break;
- }
+ if (net->type == VIR_DOMAIN_NET_TYPE_NETWORK ||
+ net->type == VIR_DOMAIN_NET_TYPE_BRIDGE) {
+ int vnet_hdr = 0;
- case VIR_DOMAIN_NET_TYPE_ETHERNET:
- {
- virBuffer buf = VIR_BUFFER_INITIALIZER;
+ if (qemuCmdFlags & QEMUD_CMD_FLAG_VNET_HDR &&
+ net->model && STREQ(net->model, "virtio"))
+ vnet_hdr = 1;
- virBufferAddLit(&buf, "tap");
- if (net->ifname)
- virBufferVSprintf(&buf, ",ifname=%s", net->ifname);
- if (net->data.ethernet.script)
- virBufferVSprintf(&buf, ",script=%s", net->data.ethernet.script);
- virBufferVSprintf(&buf, ",vlan=%d", vlan);
- if (virBufferError(&buf))
- goto error;
-
- ADD_ARG(virBufferContentAndReset(&buf));
- }
- break;
+ tapfd = qemudNetworkIfaceConnect(conn, driver, net, vnet_hdr);
+ if (tapfd < 0)
+ goto error;
- case VIR_DOMAIN_NET_TYPE_CLIENT:
- case VIR_DOMAIN_NET_TYPE_SERVER:
- case VIR_DOMAIN_NET_TYPE_MCAST:
- {
- char arg[PATH_MAX];
- const char *mode = NULL;
- switch (net->type) {
- case VIR_DOMAIN_NET_TYPE_CLIENT:
- mode = "connect";
- break;
- case VIR_DOMAIN_NET_TYPE_SERVER:
- mode = "listen";
- break;
- case VIR_DOMAIN_NET_TYPE_MCAST:
- mode = "mcast";
- break;
- }
- if (snprintf(arg, PATH_MAX-1, "socket,%s=%s:%d,vlan=%d",
- mode,
- net->data.socket.address,
- net->data.socket.port,
- vlan) >= (PATH_MAX-1))
- goto error;
-
- ADD_ARG_LIT(arg);
+ if (VIR_REALLOC_N(*tapfds, (*ntapfds)+1) < 0) {
+ close(tapfd);
+ goto no_memory;
}
- break;
- case VIR_DOMAIN_NET_TYPE_USER:
- default:
- {
- char arg[PATH_MAX];
- if (snprintf(arg, PATH_MAX-1, "user,vlan=%d", vlan) >= (PATH_MAX-1))
- goto error;
-
- ADD_ARG_LIT(arg);
- }
+ (*tapfds)[(*ntapfds)++] = tapfd;
}
- vlan++;
+ if (qemuBuildHostNetStr(conn, net, NULL, ',', i, tapfd, &host) < 0)
+ goto error;
+
+ ADD_ARG_LIT("-net");
+ ADD_ARG(host);
}
}
--
1.6.2.5
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