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[libvirt] [PATCH 3/6] bandwidth: Create (un)plug functions



These set bridge part of QoS when bringing domain's interface up.
---
 po/POTFILES.in                |    1 +
 src/util/virnetdevbandwidth.c |  177 +++++++++++++++++++++++++++++++++++++++++
 src/util/virnetdevbandwidth.h |   14 +++
 3 files changed, 192 insertions(+), 0 deletions(-)

diff --git a/po/POTFILES.in b/po/POTFILES.in
index 3e8359a..edac362 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -126,6 +126,7 @@ src/util/util.c
 src/util/viraudit.c
 src/util/virfile.c
 src/util/virnetdev.c
+src/util/virnetdevbandwidth.c
 src/util/virnetdevbridge.c
 src/util/virnetdevmacvlan.c
 src/util/virnetdevtap.c
diff --git a/src/util/virnetdevbandwidth.c b/src/util/virnetdevbandwidth.c
index ac3a93d..2d7e156 100644
--- a/src/util/virnetdevbandwidth.c
+++ b/src/util/virnetdevbandwidth.c
@@ -27,6 +27,7 @@
 #include "memory.h"
 #include "virterror_internal.h"
 #include "ignore-value.h"
+#include "logging.h"
 
 #define VIR_FROM_THIS VIR_FROM_NONE
 
@@ -167,6 +168,182 @@ cleanup:
     return ret;
 }
 
+/*
+ * virNetDevBandwidthPlug:
+ * @brname: name of the bridge
+ * @net_bandwidth: QoS settings on @brname
+ * @ifname: interface being plugged into @brname
+ * @ifmac: MAC of @ifname
+ * @bandwidth: QoS settings for @ifname
+ * @id: unique ID (MUST be greater than 2)
+ *
+ * Set bridge part of interface QoS settings,
+ * e.g. guaranteed bandwidth.
+ * @id is an unique ID (among @brname) from which
+ * other identifiers for class, qdisc and filter
+ * are derived. However, two classes were already
+ * set up (by virNetDevBandwidthSet). That's why
+ * this @id MUST be greater than 2.
+ * You may want to keep passed @id, as it is used
+ * later by virNetDevBandwidthUnplug.
+ *
+ * Returns:
+ * 1 if there is nothing to set
+ * 0 if QoS set successfully
+ * -1 otherwise.
+ */
+int
+virNetDevBandwidthPlug(const char *brname,
+                       virNetDevBandwidthPtr net_bandwidth,
+                       const char *ifname,
+                       unsigned const char *ifmac,
+                       virNetDevBandwidthPtr bandwidth,
+                       unsigned int id)
+{
+    int ret = -1;
+    virCommandPtr cmd = NULL;
+    char *class_id = NULL;
+    char *qdisc_id = NULL;
+    char *filter_id = NULL;
+    char *floor = NULL;
+    char *ceil = NULL;
+    char *mac[2];
+
+    if (!bandwidth || !bandwidth->in || !bandwidth->in->floor) {
+        /* nothing to set */
+        return 1;
+    }
+
+    if (!net_bandwidth || !net_bandwidth->in) {
+        VIR_ERROR(_("Bridge '%s' has no QoS set, "
+                    "therefore unable to set 'floor' on '%s'"),
+                    brname, ifname);
+        return -1;
+    }
+
+    if (virAsprintf(&class_id, "1:%x", id) < 0 ||
+        virAsprintf(&qdisc_id, "%x:", id) < 0 ||
+        virAsprintf(&filter_id, "%u", id) < 0 ||
+        virAsprintf(&mac[0], "0x%02x%02x%02x%02x", ifmac[2],
+                    ifmac[3], ifmac[4], ifmac[5]) < 0 ||
+        virAsprintf(&mac[1], "0x%02x%02x", ifmac[0], ifmac[1]) < 0 ||
+        virAsprintf(&floor, "%llukbps", bandwidth->in->floor) < 0 ||
+        virAsprintf(&ceil, "%llukbps", net_bandwidth->in->peak ? :
+                    net_bandwidth->in->average) < 0) {
+        virReportOOMError();
+        goto cleanup;
+    }
+
+    cmd = virCommandNew(TC);
+    virCommandAddArgList(cmd, "class", "add", "dev", brname, "parent", "1:1",
+                         "classid", class_id, "htb", "rate", floor,
+                         "ceil", ceil, NULL);
+
+    if (virCommandRun(cmd, NULL) < 0)
+        goto cleanup;
+
+    virCommandFree(cmd);
+    cmd = virCommandNew(TC);
+    virCommandAddArgList(cmd, "qdisc", "add", "dev", brname, "parent",
+                         class_id, "handle", qdisc_id, "sfq", "perturb",
+                         "10", NULL);
+
+    if (virCommandRun(cmd, NULL) < 0)
+        goto cleanup;
+
+    virCommandFree(cmd);
+    cmd = virCommandNew(TC);
+    /* Okay, this not nice. But since libvirt does not know anything
+     * about interface IP address(es), and tc fw filter simply
+     * refuse to use ebtables marks, we need to use u32 selector
+     * to match MAC address.
+     * If libvirt will ever know something, remove this FIXME
+     */
+    virCommandAddArgList(cmd, "filter", "add", "dev", brname, "protocol", "ip",
+                         "prio", filter_id, "u32",
+                         "match", "u16", "0x0800", "0xffff", "at", "-2",
+                         "match", "u32", mac[0], "0xffffffff", "at", "-12",
+                         "match", "u16", mac[1], "0xffff", "at", "-14",
+                         "flowid", class_id, NULL);
+
+    if (virCommandRun(cmd, NULL) < 0)
+        goto cleanup;
+
+    ret = 0;
+
+cleanup:
+    VIR_FREE(ceil);
+    VIR_FREE(floor);
+    VIR_FREE(mac[1]);
+    VIR_FREE(mac[0]);
+    VIR_FREE(filter_id);
+    VIR_FREE(qdisc_id);
+    VIR_FREE(class_id);
+    virCommandFree(cmd);
+    return ret;
+}
+
+/*
+ * virNetDevBandwidthUnplug:
+ * @brname: from which bridge are we unplugging
+ * @id: unique identifier (MUST be greater than 2)
+ *
+ * Remove QoS settings from bridge.
+ *
+ * Returns 0 on success, -1 otherwise.
+ */
+int
+virNetDevBandwidthUnplug(const char *brname,
+                         unsigned int id)
+{
+    int ret = -1;
+    int cmd_ret = 0;
+    virCommandPtr cmd = NULL;
+    char *class_id = NULL;
+    char *qdisc_id = NULL;
+    char *filter_id = NULL;
+
+    if (virAsprintf(&class_id, "1:%x", id) < 0 ||
+        virAsprintf(&qdisc_id, "%x:", id) < 0 ||
+        virAsprintf(&filter_id, "%u", id) < 0) {
+        virReportOOMError();
+        goto cleanup;
+    }
+
+    cmd = virCommandNew(TC);
+    virCommandAddArgList(cmd, "qdisc", "del", "dev", brname,
+                         "handle", qdisc_id, NULL);
+
+    /* Don't threat tc errors as fatal, but
+     * try to remove as much as possible */
+    if (virCommandRun(cmd, &cmd_ret) < 0)
+        goto cleanup;
+
+    virCommandFree(cmd);
+    cmd = virCommandNew(TC);
+    virCommandAddArgList(cmd, "filter", "del", "dev", brname,
+                         "prio", filter_id, NULL);
+
+    if (virCommandRun(cmd, &cmd_ret) < 0)
+        goto cleanup;
+
+    cmd = virCommandNew(TC);
+    virCommandAddArgList(cmd, "class", "del", "dev", brname,
+                         "classid", class_id, NULL);
+
+    if (virCommandRun(cmd, &cmd_ret) < 0)
+        goto cleanup;
+
+    ret = 0;
+
+cleanup:
+    VIR_FREE(filter_id);
+    VIR_FREE(qdisc_id);
+    VIR_FREE(class_id);
+    virCommandFree(cmd);
+    return ret;
+}
+
 /**
  * virNetDevBandwidthClear:
  * @ifname: on which interface
diff --git a/src/util/virnetdevbandwidth.h b/src/util/virnetdevbandwidth.h
index 1e7d46d..c1bec45 100644
--- a/src/util/virnetdevbandwidth.h
+++ b/src/util/virnetdevbandwidth.h
@@ -53,4 +53,18 @@ int virNetDevBandwidthCopy(virNetDevBandwidthPtr *dest, const virNetDevBandwidth
 
 bool virNetDevBandwidthEqual(virNetDevBandwidthPtr a, virNetDevBandwidthPtr b);
 
+
+int virNetDevBandwidthPlug(const char *brname,
+                           virNetDevBandwidthPtr net_bandwidth,
+                           const char *ifname,
+                           unsigned const char *ifmac,
+                           virNetDevBandwidthPtr bandwidth,
+                           unsigned int id)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2)
+    ATTRIBUTE_RETURN_CHECK;
+
+int virNetDevBandwidthUnplug(const char *brname,
+                             unsigned int id)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
+
 #endif /* __VIR_NETDEV_BANDWIDTH_H__ */
-- 
1.7.3.4


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