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Gathering vhostuser interface stats with ovs
When vhostuser interfaces are used, the interface statistics are not available in /proc/net/dev. This change looks at the openvswitch interfaces statistics tables to provide this information for vhostuser interface. Note that in openvswitch world drop/error doesn't always make sense for some interface type. When these informations are not available we set them to 0 on the virDomainInterfaceStats. Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
parent
03876cf506
commit
013df874db
@ -2047,6 +2047,7 @@ virNetDevMidonetUnbindPort;
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# util/virnetdevopenvswitch.h
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virNetDevOpenvswitchAddPort;
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virNetDevOpenvswitchGetMigrateData;
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virNetDevOpenvswitchInterfaceStats;
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virNetDevOpenvswitchRemovePort;
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virNetDevOpenvswitchSetMigrateData;
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@ -66,6 +66,7 @@
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#include "virhostcpu.h"
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#include "virhostmem.h"
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#include "virstats.h"
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#include "virnetdevopenvswitch.h"
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#include "capabilities.h"
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#include "viralloc.h"
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#include "viruuid.h"
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@ -10974,6 +10975,7 @@ qemuDomainInterfaceStats(virDomainPtr dom,
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virDomainInterfaceStatsPtr stats)
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{
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virDomainObjPtr vm;
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virDomainNetDefPtr net = NULL;
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size_t i;
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int ret = -1;
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@ -10991,19 +10993,27 @@ qemuDomainInterfaceStats(virDomainPtr dom,
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/* Check the path is one of the domain's network interfaces. */
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for (i = 0; i < vm->def->nnets; i++) {
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if (vm->def->nets[i]->ifname &&
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STREQ(vm->def->nets[i]->ifname, path)) {
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ret = 0;
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if (STREQ_NULLABLE(vm->def->nets[i]->ifname, path)) {
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net = vm->def->nets[i];
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break;
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}
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}
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if (ret == 0)
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ret = virNetInterfaceStats(path, stats);
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else
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if (!net) {
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virReportError(VIR_ERR_INVALID_ARG,
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_("invalid path, '%s' is not a known interface"), path);
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goto cleanup;
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}
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if (net->type == VIR_DOMAIN_NET_TYPE_VHOSTUSER) {
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if (virNetDevOpenvswitchInterfaceStats(path, stats) < 0)
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goto cleanup;
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} else {
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if (virNetInterfaceStats(path, stats) < 0)
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goto cleanup;
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}
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ret = 0;
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cleanup:
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virDomainObjEndAPI(&vm);
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return ret;
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@ -19187,9 +19197,17 @@ qemuDomainGetStatsInterface(virQEMUDriverPtr driver ATTRIBUTE_UNUSED,
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QEMU_ADD_NAME_PARAM(record, maxparams,
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"net", "name", i, dom->def->nets[i]->ifname);
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if (virNetInterfaceStats(dom->def->nets[i]->ifname, &tmp) < 0) {
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virResetLastError();
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continue;
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if (dom->def->nets[i]->type == VIR_DOMAIN_NET_TYPE_VHOSTUSER) {
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if (virNetDevOpenvswitchInterfaceStats(dom->def->nets[i]->ifname,
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&tmp) < 0) {
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virResetLastError();
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continue;
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}
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} else {
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if (virNetInterfaceStats(dom->def->nets[i]->ifname, &tmp) < 0) {
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virResetLastError();
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continue;
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}
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}
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QEMU_ADD_NET_PARAM(record, maxparams, i,
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@ -24,6 +24,8 @@
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#include <config.h>
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#include <stdio.h>
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#include "virnetdevopenvswitch.h"
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#include "vircommand.h"
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#include "viralloc.h"
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@ -270,3 +272,108 @@ int virNetDevOpenvswitchSetMigrateData(char *migrate, const char *ifname)
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virCommandFree(cmd);
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return ret;
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}
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/**
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* virNetDevOpenvswitchInterfaceStats:
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* @ifname: the name of the interface
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* @stats: the retreived domain interface stat
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*
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* Retrieves the OVS interfaces stats
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*
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* Returns 0 in case of success or -1 in case of failure
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*/
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int
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virNetDevOpenvswitchInterfaceStats(const char *ifname,
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virDomainInterfaceStatsPtr stats)
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{
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virCommandPtr cmd = NULL;
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char *output;
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long long rx_bytes;
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long long rx_packets;
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long long tx_bytes;
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long long tx_packets;
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long long rx_errs;
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long long rx_drop;
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long long tx_errs;
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long long tx_drop;
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int ret = -1;
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/* Just ensure the interface exists in ovs */
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cmd = virCommandNewArgList(OVSVSCTL, "--timeout=5",
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"get", "Interface", ifname,
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"name", NULL);
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virCommandSetOutputBuffer(cmd, &output);
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if (virCommandRun(cmd, NULL) < 0) {
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/* no ovs-vsctl or interface 'ifname' doesn't exists in ovs */
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("Interface not found"));
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goto cleanup;
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}
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VIR_FREE(output);
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virCommandFree(cmd);
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cmd = virCommandNewArgList(OVSVSCTL, "--timeout=5",
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"get", "Interface", ifname,
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"statistics:rx_bytes",
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"statistics:rx_packets",
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"statistics:tx_bytes",
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"statistics:tx_packets", NULL);
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virCommandSetOutputBuffer(cmd, &output);
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if (virCommandRun(cmd, NULL) < 0) {
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("Interface doesn't have statistics"));
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goto cleanup;
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}
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/* The TX/RX fields appear to be swapped here
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* because this is the host view. */
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if (sscanf(output, "%lld\n%lld\n%lld\n%lld\n",
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&tx_bytes, &tx_packets, &rx_bytes, &rx_packets) != 4) {
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("Fail to parse ovs-vsctl output"));
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goto cleanup;
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}
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stats->rx_bytes = rx_bytes;
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stats->rx_packets = rx_packets;
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stats->tx_bytes = tx_bytes;
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stats->tx_packets = tx_packets;
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VIR_FREE(output);
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virCommandFree(cmd);
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cmd = virCommandNewArgList(OVSVSCTL, "--timeout=5",
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"get", "Interface", ifname,
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"statistics:rx_errors",
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"statistics:rx_dropped",
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"statistics:tx_errors",
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"statistics:tx_dropped", NULL);
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virCommandSetOutputBuffer(cmd, &output);
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if (virCommandRun(cmd, NULL) < 0) {
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/* This interface don't have errors or dropped, so set them to 0 */
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stats->rx_errs = 0;
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stats->rx_drop = 0;
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stats->tx_errs = 0;
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stats->tx_drop = 0;
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} else if (sscanf(output, "%lld\n%lld\n%lld\n%lld\n",
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&tx_errs, &tx_drop, &rx_errs, &rx_drop) == 4) {
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stats->rx_errs = rx_errs;
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stats->rx_drop = rx_drop;
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stats->tx_errs = tx_errs;
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stats->tx_drop = tx_drop;
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ret = 0;
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} else {
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("Fail to parse ovs-vsctl output"));
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goto cleanup;
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}
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ret = 0;
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cleanup:
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VIR_FREE(output);
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virCommandFree(cmd);
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return ret;
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}
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@ -48,4 +48,8 @@ int virNetDevOpenvswitchGetMigrateData(char **migrate, const char *ifname)
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int virNetDevOpenvswitchSetMigrateData(char *migrate, const char *ifname)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
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int virNetDevOpenvswitchInterfaceStats(const char *ifname,
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virDomainInterfaceStatsPtr stats)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
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#endif /* __VIR_NETDEV_OPENVSWITCH_H__ */
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