virDomain: interface: add virNetDevOpenvswitchInterfaceSetQos and virNetDevOpenvswitchInterfaceClearQos

Introduce qos setting and cleaning method. Use ovs command to set qos
parameters on specific interface of qemu virtual machine.

When an ovs port is created, we add 'ifname' to external-ids. When setting
qos on an ovs port, query its qos and queue. If found, change qos on queried
queue and qos, otherwise create new queue and qos. When cleaning qos, query
and clean queues and qos in ovs table record by 'ifname' and 'vmid'.

Signed-off-by: Jinsheng Zhang <zhangjl02@inspur.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

src/libvirt_private.syms

@@ -2808,8 +2808,10 @@ virNetDevMidonetUnbindPort;
 virNetDevOpenvswitchAddPort;
 virNetDevOpenvswitchGetMigrateData;
 virNetDevOpenvswitchGetVhostuserIfname;
+virNetDevOpenvswitchInterfaceClearQos;
 virNetDevOpenvswitchInterfaceGetMaster;
 virNetDevOpenvswitchInterfaceParseStats;
+virNetDevOpenvswitchInterfaceSetQos;
 virNetDevOpenvswitchInterfaceStats;
 virNetDevOpenvswitchMaybeUnescapeReply;
 virNetDevOpenvswitchRemovePort;

src/util/virnetdevopenvswitch.c

@@ -30,6 +30,7 @@
 #include "virlog.h"
 #include "virjson.h"
 #include "virfile.h"
+#include "virutil.h"
 
 #define VIR_FROM_THIS VIR_FROM_NONE
 
@@ -140,6 +141,7 @@ int virNetDevOpenvswitchAddPort(const char *brname, const char *ifname,
     g_autofree char *ifaceid_ex_id = NULL;
     g_autofree char *profile_ex_id = NULL;
     g_autofree char *vmid_ex_id = NULL;
+    g_autofree char *ifname_ex_id = NULL;
 
     virMacAddrFormat(macaddr, macaddrstr);
     virUUIDFormat(ovsport->interfaceID, ifuuidstr);
@@ -149,6 +151,7 @@ int virNetDevOpenvswitchAddPort(const char *brname, const char *ifname,
                                         macaddrstr);
     ifaceid_ex_id = g_strdup_printf("external-ids:iface-id=\"%s\"", ifuuidstr);
     vmid_ex_id = g_strdup_printf("external-ids:vm-id=\"%s\"", vmuuidstr);
+    ifname_ex_id = g_strdup_printf("external-ids:ifname=\"%s\"", ifname);
     if (ovsport->profileID[0] != '\0') {
         profile_ex_id = g_strdup_printf("external-ids:port-profile=\"%s\"",
                                         ovsport->profileID);
@@ -174,6 +177,7 @@ int virNetDevOpenvswitchAddPort(const char *brname, const char *ifname,
                              "--", "set", "Interface", ifname, ifaceid_ex_id,
                              "--", "set", "Interface", ifname, vmid_ex_id,
                              "--", "set", "Interface", ifname, profile_ex_id,
+                             "--", "set", "Interface", ifname, ifname_ex_id,
                              "--", "set", "Interface", ifname,
                              "external-ids:iface-status=active",
                              NULL);
@@ -614,3 +618,273 @@ int virNetDevOpenvswitchUpdateVlan(const char *ifname,
 
     return 0;
 }
+
+
+/**
+ * virNetDevOpenvswitchInterfaceSetQos:
+ * @ifname: on which interface
+ * @bandwidth: rates to set (may be NULL)
+ * @swapped: true if IN/OUT should be set contrariwise
+ *
+ * Update qos configuration of an OVS port.
+ *
+ * If @swapped is set, the IN part of @bandwidth is set on
+ * @ifname's TX, and vice versa. If it is not set, IN is set on
+ * RX and OUT on TX. This is because for some types of interfaces
+ * domain and the host live on the same side of the interface (so
+ * domain's RX/TX is host's RX/TX), and for some it's swapped
+ * (domain's RX/TX is hosts's TX/RX).
+ *
+ * Return 0 on success, -1 otherwise.
+ */
+int
+virNetDevOpenvswitchInterfaceSetQos(const char *ifname,
+                                    const virNetDevBandwidth *bandwidth,
+                                    const unsigned char *vmid,
+                                    bool swapped)
+{
+    virNetDevBandwidthRate *rx = NULL; /* From domain POV */
+    virNetDevBandwidthRate *tx = NULL; /* From domain POV */
+
+    if (!bandwidth) {
+        /* nothing to be enabled */
+        return 0;
+    }
+
+    if (geteuid() != 0) {
+        virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
+                       _("Network bandwidth tuning is not available"
+                         " in session mode"));
+        return -1;
+    }
+
+    if (!ifname) {
+        virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
+                       _("Unable to set bandwidth for interface because "
+                         "device name is unknown"));
+        return -1;
+    }
+
+    if (swapped) {
+        rx = bandwidth->out;
+        tx = bandwidth->in;
+    } else {
+        rx = bandwidth->in;
+        tx = bandwidth->out;
+    }
+
+    if (!bandwidth->out && !bandwidth->in) {
+        if (virNetDevOpenvswitchInterfaceClearQos(ifname, vmid) < 0) {
+            VIR_WARN("Clean qos for interface %s failed", ifname);
+        }
+        return 0;
+    }
+
+    if (tx && tx->average) {
+        char vmuuidstr[VIR_UUID_STRING_BUFLEN];
+        g_autoptr(virCommand) cmd = NULL;
+        g_autofree char *vmid_ex_id = NULL;
+        g_autofree char *ifname_ex_id = NULL;
+        g_autofree char *average = NULL;
+        g_autofree char *peak = NULL;
+        g_autofree char *burst = NULL;
+        g_autofree char *qos_uuid = NULL;
+        g_autofree char *queue_uuid = NULL;
+
+        average = g_strdup_printf("%llu", tx->average * 8192);
+        if (tx->burst)
+            burst = g_strdup_printf("%llu", tx->burst * 8192);
+        if (tx->peak)
+            peak = g_strdup_printf("%llu", tx->peak * 8192);
+
+        /* find queue */
+        cmd = virNetDevOpenvswitchCreateCmd();
+        virUUIDFormat(vmid, vmuuidstr);
+        vmid_ex_id = g_strdup_printf("external-ids:vm-id=\"%s\"", vmuuidstr);
+        ifname_ex_id = g_strdup_printf("external-ids:ifname=\"%s\"", ifname);
+        virCommandAddArgList(cmd, "--no-heading", "--columns=_uuid", "find", "queue",
+                             vmid_ex_id, ifname_ex_id, NULL);
+        virCommandSetOutputBuffer(cmd, &queue_uuid);
+        if (virCommandRun(cmd, NULL) < 0) {
+            VIR_WARN("Unable to find queue on port %s", ifname);
+        }
+
+        /* find qos */
+        virCommandFree(cmd);
+        cmd = virNetDevOpenvswitchCreateCmd();
+        virCommandAddArgList(cmd, "--no-heading", "--columns=_uuid", "find", "qos",
+                             vmid_ex_id, ifname_ex_id, NULL);
+        virCommandSetOutputBuffer(cmd, &qos_uuid);
+        if (virCommandRun(cmd, NULL) < 0) {
+            VIR_WARN("Unable to find qos on port %s", ifname);
+        }
+
+        /* create qos and set */
+        virCommandFree(cmd);
+        cmd = virNetDevOpenvswitchCreateCmd();
+        if (queue_uuid && *queue_uuid) {
+            g_auto(GStrv) lines = g_strsplit(queue_uuid, "\n", 0);
+            virCommandAddArgList(cmd, "set", "queue", lines[0], NULL);
+        } else {
+            virCommandAddArgList(cmd, "set", "port", ifname, "qos=@qos1",
+                                 vmid_ex_id, ifname_ex_id,
+                                 "--", "--id=@qos1", "create", "qos", "type=linux-htb", NULL);
+            virCommandAddArgFormat(cmd, "other_config:min-rate=%s", average);
+            if (burst) {
+                virCommandAddArgFormat(cmd, "other_config:burst=%s", burst);
+            }
+            if (peak) {
+                virCommandAddArgFormat(cmd, "other_config:max-rate=%s", peak);
+            }
+            virCommandAddArgList(cmd, "queues:0=@queue0", vmid_ex_id, ifname_ex_id,
+                                 "--", "--id=@queue0", "create", "queue", NULL);
+        }
+        virCommandAddArgFormat(cmd, "other_config:min-rate=%s", average);
+        if (burst) {
+            virCommandAddArgFormat(cmd, "other_config:burst=%s", burst);
+        }
+        if (peak) {
+            virCommandAddArgFormat(cmd, "other_config:max-rate=%s", peak);
+        }
+        virCommandAddArgList(cmd, vmid_ex_id, ifname_ex_id, NULL);
+        if (virCommandRun(cmd, NULL) < 0) {
+            if (*queue_uuid) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("Unable to set queue configuration on port %s"), ifname);
+            } else {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("Unable to create and set qos configuration on port %s"), ifname);
+            }
+            return -1;
+        }
+
+        if (qos_uuid && *qos_uuid) {
+            g_auto(GStrv) lines = g_strsplit(qos_uuid, "\n", 0);
+
+            virCommandFree(cmd);
+            cmd = virNetDevOpenvswitchCreateCmd();
+            virCommandAddArgList(cmd, "set", "qos", lines[0], NULL);
+            virCommandAddArgFormat(cmd, "other_config:min-rate=%s", average);
+            if (burst) {
+                virCommandAddArgFormat(cmd, "other_config:burst=%s", burst);
+            }
+            if (peak) {
+                virCommandAddArgFormat(cmd, "other_config:max-rate=%s", peak);
+            }
+            virCommandAddArgList(cmd, vmid_ex_id, ifname_ex_id, NULL);
+            if (virCommandRun(cmd, NULL) < 0) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("Unable to set qos configuration on port %s"), ifname);
+                return -1;
+            }
+        }
+    }
+
+    if (rx) {
+        g_autoptr(virCommand) cmd = NULL;
+
+        cmd = virNetDevOpenvswitchCreateCmd();
+        virCommandAddArgList(cmd, "set", "Interface", ifname, NULL);
+        virCommandAddArgFormat(cmd, "ingress_policing_rate=%llu", rx->average * 8);
+        if (rx->burst)
+            virCommandAddArgFormat(cmd, "ingress_policing_burst=%llu", rx->burst * 8);
+
+        if (virCommandRun(cmd, NULL) < 0) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("Unable to set vlan configuration on port %s"), ifname);
+            return -1;
+        }
+    }
+
+    return 0;
+}
+
+int
+virNetDevOpenvswitchInterfaceClearQos(const char *ifname,
+                                      const unsigned char *vmid)
+{
+    char vmuuidstr[VIR_UUID_STRING_BUFLEN];
+    g_autoptr(virCommand) cmd = NULL;
+    g_autofree char *vmid_ex_id = NULL;
+    g_autofree char *qos_uuid = NULL;
+    g_autofree char *queue_uuid = NULL;
+    g_autofree char *port_qos = NULL;
+    size_t i;
+
+    /* find qos */
+    cmd = virNetDevOpenvswitchCreateCmd();
+    virUUIDFormat(vmid, vmuuidstr);
+    vmid_ex_id = g_strdup_printf("external-ids:vm-id=\"%s\"", vmuuidstr);
+    virCommandAddArgList(cmd, "--no-heading", "--columns=_uuid", "find", "qos", vmid_ex_id, NULL);
+    virCommandSetOutputBuffer(cmd, &qos_uuid);
+    if (virCommandRun(cmd, NULL) < 0) {
+        VIR_WARN("Unable to find qos on port %s", ifname);
+    }
+
+    /* find queue */
+    virCommandFree(cmd);
+    cmd = virNetDevOpenvswitchCreateCmd();
+    vmid_ex_id = g_strdup_printf("external-ids:vm-id=\"%s\"", vmuuidstr);
+    virCommandAddArgList(cmd, "--no-heading", "--columns=_uuid", "find", "queue", vmid_ex_id, NULL);
+    virCommandSetOutputBuffer(cmd, &queue_uuid);
+    if (virCommandRun(cmd, NULL) < 0) {
+        VIR_WARN("Unable to find queue on port %s", ifname);
+    }
+
+    if (qos_uuid && *qos_uuid) {
+        g_auto(GStrv) lines = g_strsplit(qos_uuid, "\n", 0);
+
+        /* destroy qos */
+        for (i = 0; lines[i] != NULL; i++) {
+            const char *line = lines[i];
+            if (!*line) {
+                continue;
+            }
+            virCommandFree(cmd);
+            cmd = virNetDevOpenvswitchCreateCmd();
+            virCommandAddArgList(cmd, "--no-heading", "--columns=_uuid", "--if-exists",
+                    "list", "port", ifname, "qos", NULL);
+            virCommandSetOutputBuffer(cmd, &port_qos);
+            if (virCommandRun(cmd, NULL) < 0) {
+                VIR_WARN("Unable to remove port qos on port %s", ifname);
+            }
+            if (port_qos && *port_qos) {
+                virCommandFree(cmd);
+                cmd = virNetDevOpenvswitchCreateCmd();
+                virCommandAddArgList(cmd, "remove", "port", ifname, "qos", line, NULL);
+                if (virCommandRun(cmd, NULL) < 0) {
+                    VIR_WARN("Unable to remove port qos on port %s", ifname);
+                }
+            }
+            virCommandFree(cmd);
+            cmd = virNetDevOpenvswitchCreateCmd();
+            virCommandAddArgList(cmd, "destroy", "qos", line, NULL);
+            if (virCommandRun(cmd, NULL) < 0) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("Unable to destroy qos on port %s"), ifname);
+                return -1;
+            }
+        }
+    }
+    /* destroy queue */
+    if (queue_uuid && *queue_uuid) {
+        g_auto(GStrv) lines = g_strsplit(queue_uuid, "\n", 0);
+
+        for (i = 0; lines[i] != NULL; i++) {
+            const char *line = lines[i];
+            if (!*line) {
+                continue;
+            }
+            virCommandFree(cmd);
+            cmd = virNetDevOpenvswitchCreateCmd();
+            virCommandAddArgList(cmd, "destroy", "queue", line, NULL);
+            if (virCommandRun(cmd, NULL) < 0) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("Unable to destroy queue on port %s"), ifname);
+                return -1;
+            }
+        }
+    }
+
+    return 0;
+}

src/util/virnetdevopenvswitch.h

@@ -21,6 +21,7 @@
 #pragma once
 
 #include "internal.h"
+#include "virnetdevbandwidth.h"
 #include "virnetdevvportprofile.h"
 #include "virnetdevvlan.h"
 
@@ -69,3 +70,13 @@ int virNetDevOpenvswitchGetVhostuserIfname(const char *path,
 int virNetDevOpenvswitchUpdateVlan(const char *ifname,
                                    const virNetDevVlan *virtVlan)
     ATTRIBUTE_NONNULL(1) G_GNUC_WARN_UNUSED_RESULT;
+
+int virNetDevOpenvswitchInterfaceSetQos(const char *ifname,
+                                        const virNetDevBandwidth *bandwidth,
+                                        const unsigned char *vmid,
+                                        bool swapped)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(3) G_GNUC_WARN_UNUSED_RESULT;
+
+int virNetDevOpenvswitchInterfaceClearQos(const char *ifname,
+                                          const unsigned char *vmid)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) G_GNUC_WARN_UNUSED_RESULT;