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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 1/2] xenconfig: support parsing and formatting vif bandwidth
Both xm and xl config have long supported specifying vif rate
limiting, e.g.
vif = [ 'mac=00:16:3E:74:3d:76,bridge=br0,rate=10MB/s' ]
Add support for mapping rate to and from <bandwidth> in the xenconfig
parser and formatter. rate is mapped to the required 'average' attribute
of the <outbound> element, e.g.
<interface type='bridge'>
...
<bandwidth>
<outbound average='10240'/>
</bandwidth>
</interface>
Also add a unit test to check the conversion logic.
Signed-off-by: Jim Fehlig <jfehlig@xxxxxxxx>
---
I used a bit of code from libxlu_vif.c to implement xenParseVifRate()
instead of using the libxlutil lib directly, since in theory rate limiting
applies to the old xen driver (no libxl) as well.
src/xenconfig/xen_common.c | 77 ++++++++++++++++++++++++++++++++++++
tests/xlconfigdata/test-vif-rate.cfg | 26 ++++++++++++
tests/xlconfigdata/test-vif-rate.xml | 57 ++++++++++++++++++++++++++
tests/xlconfigtest.c | 1 +
4 files changed, 161 insertions(+)
diff --git a/src/xenconfig/xen_common.c b/src/xenconfig/xen_common.c
index 54f5791..b9f0344 100644
--- a/src/xenconfig/xen_common.c
+++ b/src/xenconfig/xen_common.c
@@ -28,6 +28,8 @@
#include <config.h>
+#include <regex.h>
+
#include "internal.h"
#include "virerror.h"
#include "virconf.h"
@@ -803,6 +805,46 @@ xenParseCharDev(virConfPtr conf, virDomainDefPtr def)
}
+static const char *vif_bytes_per_sec_re = "^[0-9]+[GMK]?[Bb]/s$";
+
+static int
+xenParseVifRate(char *rate, unsigned long long *kbytes_per_sec)
+{
+ regex_t rec;
+ char *suffix;
+ unsigned long long tmp;
+ int ret = -1;
+
+ regcomp(&rec, vif_bytes_per_sec_re, REG_EXTENDED|REG_NOSUB);
+ if (regexec(&rec, rate, 0, NULL, 0)) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Invalid rate '%s' specified"), rate);
+ goto cleanup;
+ }
+
+ if (virStrToLong_ull(rate, &suffix, 10, &tmp)) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Failed to parse rate '%s'"), rate);
+ goto cleanup;
+ }
+
+ if (*suffix == 'G')
+ tmp *= 1024 * 1024;
+ else if (*suffix == 'M')
+ tmp *= 1024;
+
+ if (*suffix == 'b' || *(suffix + 1) == 'b')
+ tmp /= 8;
+
+ *kbytes_per_sec = tmp;
+ ret = 0;
+
+ cleanup:
+ regfree(&rec);
+ return ret;
+}
+
+
static int
xenParseVif(virConfPtr conf, virDomainDefPtr def)
{
@@ -819,6 +861,7 @@ xenParseVif(virConfPtr conf, virDomainDefPtr def)
char mac[18];
char bridge[50];
char vifname[50];
+ char rate[50];
char *key;
bridge[0] = '\0';
@@ -827,6 +870,7 @@ xenParseVif(virConfPtr conf, virDomainDefPtr def)
model[0] = '\0';
type[0] = '\0';
vifname[0] = '\0';
+ rate[0] = '\0';
if ((list->type != VIR_CONF_STRING) || (list->str == NULL))
goto skipnic;
@@ -892,6 +936,13 @@ xenParseVif(virConfPtr conf, virDomainDefPtr def)
_("IP %s too big for destination"),
data);
goto skipnic;
}
+ } else if (STRPREFIX(key, "rate=")) {
+ int len = nextkey ? (nextkey - data) : sizeof(rate) - 1;
+ if (virStrncpy(rate, data, len, sizeof(rate)) == NULL) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("rate %s too big for destination"),
data);
+ goto skipnic;
+ }
}
while (nextkey && (nextkey[0] == ',' ||
@@ -942,6 +993,29 @@ xenParseVif(virConfPtr conf, virDomainDefPtr def)
VIR_STRDUP(net->ifname, vifname) < 0)
goto cleanup;
+ if (rate[0]) {
+ char *p;
+ virNetDevBandwidthPtr bandwidth;
+ unsigned long long kbytes_per_sec;
+
+ p = strchr(rate, '@');
+ if (p != NULL)
+ *p = 0;
+
+ if (xenParseVifRate(rate, &kbytes_per_sec) < 0)
+ goto cleanup;
+
+ if (VIR_ALLOC(bandwidth) < 0)
+ goto cleanup;
+ if (VIR_ALLOC(bandwidth->out) < 0) {
+ VIR_FREE(bandwidth);
+ goto cleanup;
+ }
+
+ bandwidth->out->average = kbytes_per_sec;
+ net->bandwidth = bandwidth;
+ }
+
if (VIR_APPEND_ELEMENT(def->nets, def->nnets, net) < 0)
goto cleanup;
@@ -1184,6 +1258,9 @@ xenFormatNet(virConnectPtr conn,
virBufferAsprintf(&buf, ",vifname=%s",
net->ifname);
+ if (net->bandwidth && net->bandwidth->out && net->bandwidth->out->average)
+ virBufferAsprintf(&buf, ",rate=%lluKB/s",
net->bandwidth->out->average);
+
if (virBufferCheckError(&buf) < 0)
goto cleanup;
diff --git a/tests/xlconfigdata/test-vif-rate.cfg
b/tests/xlconfigdata/test-vif-rate.cfg
new file mode 100644
index 0000000..c5484dc
--- /dev/null
+++ b/tests/xlconfigdata/test-vif-rate.cfg
@@ -0,0 +1,26 @@
+name = "XenGuest2"
+uuid = "c7a5fdb2-cdaf-9455-926a-d65c16db1809"
+maxmem = 579
+memory = 394
+vcpus = 1
+pae = 1
+acpi = 1
+apic = 1
+hap = 0
+viridian = 0
+rtc_timeoffset = 0
+localtime = 0
+on_poweroff = "destroy"
+on_reboot = "restart"
+on_crash = "restart"
+device_model = "/usr/lib/xen/bin/qemu-dm"
+sdl = 0
+vnc = 1
+vncunused = 1
+vnclisten = "127.0.0.1"
+vif = [
"mac=00:16:3e:66:92:9c,bridge=xenbr1,script=vif-bridge,model=e1000,rate=10240KB/s"
]
+parallel = "none"
+serial = "none"
+builder = "hvm"
+boot = "d"
+disk = [ "/dev/HostVG/XenGuest2,raw,hda,w,backendtype=phy",
"/var/lib/libvirt/images/XenGuest2-home,qcow2,hdb,w,backendtype=qdisk",
"/root/boot.iso,raw,hdc,r,backendtype=qdisk,devtype=cdrom" ]
diff --git a/tests/xlconfigdata/test-vif-rate.xml
b/tests/xlconfigdata/test-vif-rate.xml
new file mode 100644
index 0000000..29f0f79
--- /dev/null
+++ b/tests/xlconfigdata/test-vif-rate.xml
@@ -0,0 +1,57 @@
+<domain type='xen'>
+ <name>XenGuest2</name>
+ <uuid>c7a5fdb2-cdaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>592896</memory>
+ <currentMemory unit='KiB'>403456</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='x86_64' machine='xenfv'>hvm</type>
+ <loader type='rom'>/usr/lib/xen/boot/hvmloader</loader>
+ <boot dev='cdrom'/>
+ </os>
+ <features>
+ <acpi/>
+ <apic/>
+ <pae/>
+ </features>
+ <clock offset='variable' adjustment='0' basis='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>restart</on_crash>
+ <devices>
+ <emulator>/usr/lib/xen/bin/qemu-dm</emulator>
+ <disk type='block' device='disk'>
+ <driver name='phy' type='raw'/>
+ <source dev='/dev/HostVG/XenGuest2'/>
+ <target dev='hda' bus='ide'/>
+ <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+ </disk>
+ <disk type='file' device='disk'>
+ <driver name='qemu' type='qcow2'/>
+ <source file='/var/lib/libvirt/images/XenGuest2-home'/>
+ <target dev='hdb' bus='ide'/>
+ <address type='drive' controller='0' bus='0' target='0' unit='1'/>
+ </disk>
+ <disk type='file' device='cdrom'>
+ <driver name='qemu' type='raw'/>
+ <source file='/root/boot.iso'/>
+ <target dev='hdc' bus='ide'/>
+ <readonly/>
+ <address type='drive' controller='0' bus='1' target='0' unit='0'/>
+ </disk>
+ <interface type='bridge'>
+ <mac address='00:16:3e:66:92:9c'/>
+ <source bridge='xenbr1'/>
+ <bandwidth>
+ <outbound average='10240'/>
+ </bandwidth>
+ <script path='vif-bridge'/>
+ <model type='e1000'/>
+ </interface>
+ <input type='mouse' bus='ps2'/>
+ <input type='keyboard' bus='ps2'/>
+ <graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1'>
+ <listen type='address' address='127.0.0.1'/>
+ </graphics>
+ </devices>
+</domain>
diff --git a/tests/xlconfigtest.c b/tests/xlconfigtest.c
index 1db11e7..e997009 100644
--- a/tests/xlconfigtest.c
+++ b/tests/xlconfigtest.c
@@ -196,6 +196,7 @@ mymain(void)
DO_TEST("new-disk");
DO_TEST("spice");
DO_TEST("spice-features");
+ DO_TEST("vif-rate");
#ifdef LIBXL_HAVE_BUILDINFO_USBDEVICE_LIST
DO_TEST("fullvirt-multiusb");
--
2.1.4
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