Add virDomain{Set, Get}BlockIoTune support to the remote driver

Support Block I/O Throttle setting and query to remote driver.

Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Signed-off-by: Eric Blake <eblake@redhat.com>

daemon/remote.c

@@ -1891,6 +1891,70 @@ cleanup:
     return rv;
 }
 
+static int
+remoteDispatchDomainGetBlockIoTune(virNetServerPtr server ATTRIBUTE_UNUSED,
+                                   virNetServerClientPtr client ATTRIBUTE_UNUSED,
+                                   virNetMessagePtr hdr ATTRIBUTE_UNUSED,
+                                   virNetMessageErrorPtr rerr,
+                                   remote_domain_get_block_io_tune_args *args,
+                                   remote_domain_get_block_io_tune_ret *ret)
+{
+    virDomainPtr dom = NULL;
+    int rv = -1;
+    virTypedParameterPtr params = NULL;
+    int nparams = args->nparams;
+    struct daemonClientPrivate *priv =
+        virNetServerClientGetPrivateData(client);
+
+    if (!priv->conn) {
+        virNetError(VIR_ERR_INTERNAL_ERROR, "%s", _("connection not open"));
+        goto cleanup;
+    }
+
+    if (nparams > REMOTE_DOMAIN_BLOCK_IO_TUNE_PARAMETERS_MAX) {
+        virNetError(VIR_ERR_INTERNAL_ERROR, "%s", _("nparams too large"));
+        goto cleanup;
+    }
+
+    if (VIR_ALLOC_N(params, nparams) < 0) {
+        virReportOOMError();
+        goto cleanup;
+    }
+
+    if (!(dom = get_nonnull_domain(priv->conn, args->dom)))
+        goto cleanup;
+
+    if (virDomainGetBlockIoTune(dom, args->disk ? *args->disk : NULL,
+                                params, &nparams, args->flags) < 0)
+        goto cleanup;
+
+    /* In this case, we need to send back the number of parameters
+     * supported
+     */
+    if (args->nparams == 0) {
+        ret->nparams = nparams;
+        goto success;
+    }
+
+    /* Serialise the block I/O tuning parameters. */
+    if (remoteSerializeTypedParameters(params, nparams,
+                                       &ret->params.params_val,
+                                       &ret->params.params_len,
+                                       args->flags) < 0)
+        goto cleanup;
+
+success:
+    rv = 0;
+
+cleanup:
+    if (rv < 0)
+        virNetMessageSaveError(rerr);
+    virTypedParameterArrayClear(params, nparams);
+    VIR_FREE(params);
+    if (dom)
+        virDomainFree(dom);
+    return rv;
+}
 
 /*-------------------------------------------------------------*/
 

src/remote/remote_driver.c

@@ -2200,6 +2200,61 @@ done:
     return rv;
 }
 
+static int remoteDomainGetBlockIoTune(virDomainPtr domain,
+                                      const char *disk,
+                                      virTypedParameterPtr params,
+                                      int *nparams,
+                                      unsigned int flags)
+{
+    int rv = -1;
+    remote_domain_get_block_io_tune_args args;
+    remote_domain_get_block_io_tune_ret ret;
+    struct private_data *priv = domain->conn->privateData;
+
+    remoteDriverLock(priv);
+
+    make_nonnull_domain(&args.dom, domain);
+    args.disk = disk ? (char **)&disk : NULL;
+    args.nparams = *nparams;
+    args.flags = flags;
+
+    memset(&ret, 0, sizeof(ret));
+
+
+    if (call(domain->conn, priv, 0, REMOTE_PROC_DOMAIN_GET_BLOCK_IO_TUNE,
+             (xdrproc_t) xdr_remote_domain_get_block_io_tune_args,
+               (char *) &args,
+             (xdrproc_t) xdr_remote_domain_get_block_io_tune_ret,
+               (char *) &ret) == -1) {
+        goto done;
+    }
+
+    /* Handle the case when the caller does not know the number of parameters
+     * and is asking for the number of parameters supported
+     */
+    if (*nparams == 0) {
+        *nparams = ret.nparams;
+        rv = 0;
+        goto cleanup;
+    }
+
+    if (remoteDeserializeTypedParameters(ret.params.params_val,
+                                         ret.params.params_len,
+                                         REMOTE_DOMAIN_MEMORY_PARAMETERS_MAX,
+                                         params,
+                                         nparams) < 0)
+        goto cleanup;
+
+    rv = 0;
+
+cleanup:
+    xdr_free ((xdrproc_t) xdr_remote_domain_get_block_io_tune_ret,
+              (char *) &ret);
+done:
+    remoteDriverUnlock(priv);
+    return rv;
+}
+
 /*----------------------------------------------------------------------*/
 
 static virDrvOpenStatus ATTRIBUTE_NONNULL (1)
@@ -4620,6 +4675,8 @@ static virDriver remote_driver = {
     .setKeepAlive = remoteSetKeepAlive, /* 0.9.8 */
     .isAlive = remoteIsAlive, /* 0.9.8 */
     .nodeSuspendForDuration = remoteNodeSuspendForDuration, /* 0.9.8 */
+    .domainSetBlockIoTune = remoteDomainSetBlockIoTune, /* 0.9.8 */
+    .domainGetBlockIoTune = remoteDomainGetBlockIoTune, /* 0.9.8 */
 };
 
 static virNetworkDriver network_driver = {

src/remote/remote_protocol.x

@@ -125,6 +125,9 @@ const REMOTE_DOMAIN_BLKIO_PARAMETERS_MAX = 16;
 /* Upper limit on list of memory parameters. */
 const REMOTE_DOMAIN_MEMORY_PARAMETERS_MAX = 16;
 
+/* Upper limit on list of blockio tuning parameters. */
+const REMOTE_DOMAIN_BLOCK_IO_TUNE_PARAMETERS_MAX = 16;
+
 /* Upper limit on list of node cpu stats. */
 const REMOTE_NODE_CPU_STATS_MAX = 16;
 
@@ -1082,6 +1085,25 @@ struct remote_domain_block_pull_args {
     unsigned int flags;
 };
 
+struct remote_domain_set_block_io_tune_args {
+    remote_nonnull_domain dom;
+    remote_nonnull_string disk;
+    remote_typed_param params<REMOTE_DOMAIN_BLOCK_IO_TUNE_PARAMETERS_MAX>;
+    unsigned int flags;
+};
+
+struct remote_domain_get_block_io_tune_args {
+    remote_nonnull_domain dom;
+    remote_string disk;
+    int nparams;
+    unsigned int flags;
+};
+
+struct remote_domain_get_block_io_tune_ret {
+    remote_typed_param params<REMOTE_DOMAIN_BLOCK_IO_TUNE_PARAMETERS_MAX>;
+    int nparams;
+};
+
 /* Network calls: */
 
 struct remote_num_of_networks_ret {
@@ -2581,7 +2603,9 @@ enum remote_procedure {
     REMOTE_PROC_DOMAIN_OPEN_GRAPHICS = 249, /* skipgen skipgen */
     REMOTE_PROC_NODE_SUSPEND_FOR_DURATION = 250, /* autogen autogen */
 
-    REMOTE_PROC_DOMAIN_BLOCK_RESIZE = 251 /* autogen autogen */
+    REMOTE_PROC_DOMAIN_BLOCK_RESIZE = 251, /* autogen autogen */
+    REMOTE_PROC_DOMAIN_SET_BLOCK_IO_TUNE = 252, /* autogen autogen */
+    REMOTE_PROC_DOMAIN_GET_BLOCK_IO_TUNE = 253 /* skipgen skipgen */
 
     /*
      * Notice how the entries are grouped in sets of 10 ?

src/remote_protocol-structs

@@ -765,6 +765,28 @@ struct remote_domain_block_pull_args {
         uint64_t                   bandwidth;
         u_int                      flags;
 };
+struct remote_domain_set_block_io_tune_args {
+        remote_nonnull_domain      dom;
+        remote_nonnull_string      disk;
+        struct {
+                u_int              params_len;
+                remote_typed_param * params_val;
+        } params;
+        u_int                      flags;
+};
+struct remote_domain_get_block_io_tune_args {
+        remote_nonnull_domain      dom;
+        remote_string              disk;
+        int                        nparams;
+        u_int                      flags;
+};
+struct remote_domain_get_block_io_tune_ret {
+        struct {
+                u_int              params_len;
+                remote_typed_param * params_val;
+        } params;
+        int                        nparams;
+};
 struct remote_num_of_networks_ret {
         int                        num;
 };
@@ -2020,4 +2042,6 @@ enum remote_procedure {
         REMOTE_PROC_DOMAIN_OPEN_GRAPHICS = 249,
         REMOTE_PROC_NODE_SUSPEND_FOR_DURATION = 250,
         REMOTE_PROC_DOMAIN_BLOCK_RESIZE = 251,
+        REMOTE_PROC_DOMAIN_SET_BLOCK_IO_TUNE = 252,
+        REMOTE_PROC_DOMAIN_GET_BLOCK_IO_TUNE = 253,
 };