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bandwidth: Create (un)plug functions
These set bridge part of QoS when bringing domain's interface up. Long story short, if there's a 'floor' set, a new QoS class is created. ClassID MUST be unique within the bridge and should be kept for unplug phase.
This commit is contained in:
Michal Privoznik
parent
67159f1c60
commit
7cdbacb472
@ -160,6 +160,7 @@ src/util/virinitctl.c
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src/util/virkeyfile.c
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src/util/virlockspace.c
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src/util/virnetdev.c
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src/util/virnetdevbandwidth.c
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src/util/virnetdevbridge.c
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src/util/virnetdevmacvlan.c
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src/util/virnetdevopenvswitch.c
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@ -352,3 +352,185 @@ virNetDevBandwidthEqual(virNetDevBandwidthPtr a,
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return true;
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}
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/*
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* virNetDevBandwidthPlug:
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* @brname: name of the bridge
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* @net_bandwidth: QoS settings on @brname
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* @ifmac: MAC of interface
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* @bandwidth: QoS settings for interface
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* @id: unique ID (MUST be greater than 2)
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*
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* Set bridge part of interface QoS settings, e.g. guaranteed
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* bandwidth. @id is an unique ID (among @brname) from which
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* other identifiers for class, qdisc and filter are derived.
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* However, two classes were already set up (by
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* virNetDevBandwidthSet). That's why this @id MUST be greater
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* than 2. You may want to keep passed @id, as it is used later
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* by virNetDevBandwidthUnplug.
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*
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* Returns:
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* 0 if QoS set successfully
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* -1 otherwise.
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*/
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int
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virNetDevBandwidthPlug(const char *brname,
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virNetDevBandwidthPtr net_bandwidth,
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const virMacAddrPtr ifmac_ptr,
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virNetDevBandwidthPtr bandwidth,
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unsigned int id)
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{
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int ret = -1;
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virCommandPtr cmd = NULL;
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char *class_id = NULL;
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char *qdisc_id = NULL;
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char *filter_id = NULL;
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char *floor = NULL;
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char *ceil = NULL;
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unsigned char ifmac[VIR_MAC_BUFLEN];
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char ifmacStr[VIR_MAC_STRING_BUFLEN];
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char *mac[2] = {NULL, NULL};
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if (id <= 2) {
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virReportError(VIR_ERR_INTERNAL_ERROR, _("Invalid class ID %d"), id);
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return -1;
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}
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virMacAddrGetRaw(ifmac_ptr, ifmac);
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virMacAddrFormat(ifmac_ptr, ifmacStr);
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if (!net_bandwidth || !net_bandwidth->in) {
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virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
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_("Bridge '%s' has no QoS set, therefore "
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"unable to set 'floor' on '%s'"),
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brname, ifmacStr);
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return -1;
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}
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if (virAsprintf(&class_id, "1:%x", id) < 0 ||
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virAsprintf(&qdisc_id, "%x:", id) < 0 ||
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virAsprintf(&filter_id, "%u", id) < 0 ||
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virAsprintf(&mac[0], "0x%02x%02x%02x%02x", ifmac[2],
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ifmac[3], ifmac[4], ifmac[5]) < 0 ||
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virAsprintf(&mac[1], "0x%02x%02x", ifmac[0], ifmac[1]) < 0 ||
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virAsprintf(&floor, "%llukbps", bandwidth->in->floor) < 0 ||
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virAsprintf(&ceil, "%llukbps", net_bandwidth->in->peak ?
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net_bandwidth->in->peak :
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net_bandwidth->in->average) < 0) {
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virReportOOMError();
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goto cleanup;
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}
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cmd = virCommandNew(TC);
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virCommandAddArgList(cmd, "class", "add", "dev", brname, "parent", "1:1",
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"classid", class_id, "htb", "rate", floor,
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"ceil", ceil, NULL);
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if (virCommandRun(cmd, NULL) < 0)
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goto cleanup;
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virCommandFree(cmd);
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cmd = virCommandNew(TC);
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virCommandAddArgList(cmd, "qdisc", "add", "dev", brname, "parent",
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class_id, "handle", qdisc_id, "sfq", "perturb",
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"10", NULL);
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if (virCommandRun(cmd, NULL) < 0)
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goto cleanup;
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virCommandFree(cmd);
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cmd = virCommandNew(TC);
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/* Okay, this not nice. But since libvirt does not know anything about
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* interface IP address(es), and tc fw filter simply refuse to use ebtables
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* marks, we need to use u32 selector to match MAC address.
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* If libvirt will ever know something, remove this FIXME
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*/
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virCommandAddArgList(cmd, "filter", "add", "dev", brname, "protocol", "ip",
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"prio", filter_id, "u32",
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"match", "u16", "0x0800", "0xffff", "at", "-2",
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"match", "u32", mac[0], "0xffffffff", "at", "-12",
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"match", "u16", mac[1], "0xffff", "at", "-14",
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"flowid", class_id, NULL);
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if (virCommandRun(cmd, NULL) < 0)
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goto cleanup;
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ret = 0;
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cleanup:
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VIR_FREE(mac[1]);
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VIR_FREE(mac[0]);
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VIR_FREE(ceil);
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VIR_FREE(floor);
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VIR_FREE(filter_id);
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VIR_FREE(qdisc_id);
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VIR_FREE(class_id);
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virCommandFree(cmd);
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return ret;
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}
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/*
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* virNetDevBandwidthUnplug:
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* @brname: from which bridge are we unplugging
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* @id: unique identifier (MUST be greater than 2)
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*
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* Remove QoS settings from bridge.
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*
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* Returns 0 on success, -1 otherwise.
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*/
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int
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virNetDevBandwidthUnplug(const char *brname,
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unsigned int id)
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{
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int ret = -1;
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int cmd_ret = 0;
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virCommandPtr cmd = NULL;
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char *class_id = NULL;
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char *qdisc_id = NULL;
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char *filter_id = NULL;
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if (id <= 2) {
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virReportError(VIR_ERR_INTERNAL_ERROR, _("Invalid class ID %d"), id);
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return -1;
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}
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if (virAsprintf(&class_id, "1:%x", id) < 0 ||
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virAsprintf(&qdisc_id, "%x:", id) < 0 ||
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virAsprintf(&filter_id, "%u", id) < 0) {
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virReportOOMError();
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goto cleanup;
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}
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cmd = virCommandNew(TC);
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virCommandAddArgList(cmd, "qdisc", "del", "dev", brname,
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"handle", qdisc_id, NULL);
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/* Don't threat tc errors as fatal, but
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* try to remove as much as possible */
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if (virCommandRun(cmd, &cmd_ret) < 0)
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goto cleanup;
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virCommandFree(cmd);
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cmd = virCommandNew(TC);
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virCommandAddArgList(cmd, "filter", "del", "dev", brname,
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"prio", filter_id, NULL);
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if (virCommandRun(cmd, &cmd_ret) < 0)
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goto cleanup;
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cmd = virCommandNew(TC);
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virCommandAddArgList(cmd, "class", "del", "dev", brname,
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"classid", class_id, NULL);
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if (virCommandRun(cmd, &cmd_ret) < 0)
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goto cleanup;
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ret = 0;
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cleanup:
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VIR_FREE(filter_id);
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VIR_FREE(qdisc_id);
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VIR_FREE(class_id);
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virCommandFree(cmd);
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return ret;
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}
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@ -24,6 +24,7 @@
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# define __VIR_NETDEV_BANDWIDTH_H__
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# include "internal.h"
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# include "virmacaddr.h"
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typedef struct _virNetDevBandwidthRate virNetDevBandwidthRate;
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typedef virNetDevBandwidthRate *virNetDevBandwidthRatePtr;
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@ -53,4 +54,17 @@ int virNetDevBandwidthCopy(virNetDevBandwidthPtr *dest, const virNetDevBandwidth
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bool virNetDevBandwidthEqual(virNetDevBandwidthPtr a, virNetDevBandwidthPtr b);
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int virNetDevBandwidthPlug(const char *brname,
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virNetDevBandwidthPtr net_bandwidth,
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const virMacAddrPtr ifmac_ptr,
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virNetDevBandwidthPtr bandwidth,
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unsigned int id)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2)
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ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4)
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ATTRIBUTE_RETURN_CHECK;
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int virNetDevBandwidthUnplug(const char *brname,
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unsigned int id)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
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#endif /* __VIR_NETDEV_BANDWIDTH_H__ */
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