multifd: Add multifd-compression parameter

This will store the compression method to use.  We start with none.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

---

Rename multifd-method to multifd-compression

hw/core/qdev-properties.c

@@ -8,6 +8,7 @@
 #include "qapi/qmp/qerror.h"
 #include "qemu/ctype.h"
 #include "qemu/error-report.h"
+#include "qapi/qapi-types-migration.h"
 #include "hw/block/block.h"
 #include "net/hub.h"
 #include "qapi/visitor.h"
@@ -639,6 +640,18 @@ const PropertyInfo qdev_prop_fdc_drive_type = {
     .set_default_value = set_default_value_enum,
 };
 
+/* --- MultiFDCompression --- */
+
+const PropertyInfo qdev_prop_multifd_compression = {
+    .name = "MultiFDCompression",
+    .description = "multifd_compression values, "
+                   "none",
+    .enum_table = &MultiFDCompression_lookup,
+    .get = get_enum,
+    .set = set_enum,
+    .set_default_value = set_default_value_enum,
+};
+
 /* --- pci address --- */
 
 /*

include/hw/qdev-properties.h

@@ -20,6 +20,7 @@ extern const PropertyInfo qdev_prop_chr;
 extern const PropertyInfo qdev_prop_tpm;
 extern const PropertyInfo qdev_prop_macaddr;
 extern const PropertyInfo qdev_prop_on_off_auto;
+extern const PropertyInfo qdev_prop_multifd_compression;
 extern const PropertyInfo qdev_prop_losttickpolicy;
 extern const PropertyInfo qdev_prop_blockdev_on_error;
 extern const PropertyInfo qdev_prop_bios_chs_trans;
@@ -184,6 +185,9 @@ extern const PropertyInfo qdev_prop_pcie_link_width;
     DEFINE_PROP(_n, _s, _f, qdev_prop_macaddr, MACAddr)
 #define DEFINE_PROP_ON_OFF_AUTO(_n, _s, _f, _d) \
     DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_on_off_auto, OnOffAuto)
+#define DEFINE_PROP_MULTIFD_COMPRESSION(_n, _s, _f, _d) \
+    DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_multifd_compression, \
+                       MultiFDCompression)
 #define DEFINE_PROP_LOSTTICKPOLICY(_n, _s, _f, _d) \
     DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_losttickpolicy, \
                         LostTickPolicy)

migration/migration.c

@@ -88,6 +88,7 @@
 /* The delay time (in ms) between two COLO checkpoints */
 #define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY (200 * 100)
 #define DEFAULT_MIGRATE_MULTIFD_CHANNELS 2
+#define DEFAULT_MIGRATE_MULTIFD_COMPRESSION MULTIFD_COMPRESSION_NONE
 
 /* Background transfer rate for postcopy, 0 means unlimited, note
  * that page requests can still exceed this limit.
@@ -798,6 +799,8 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp)
     params->block_incremental = s->parameters.block_incremental;
     params->has_multifd_channels = true;
     params->multifd_channels = s->parameters.multifd_channels;
+    params->has_multifd_compression = true;
+    params->multifd_compression = s->parameters.multifd_compression;
     params->has_xbzrle_cache_size = true;
     params->xbzrle_cache_size = s->parameters.xbzrle_cache_size;
     params->has_max_postcopy_bandwidth = true;
@@ -1315,6 +1318,9 @@ static void migrate_params_test_apply(MigrateSetParameters *params,
     if (params->has_multifd_channels) {
         dest->multifd_channels = params->multifd_channels;
     }
+    if (params->has_multifd_compression) {
+        dest->multifd_compression = params->multifd_compression;
+    }
     if (params->has_xbzrle_cache_size) {
         dest->xbzrle_cache_size = params->xbzrle_cache_size;
     }
@@ -1411,6 +1417,9 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
     if (params->has_multifd_channels) {
         s->parameters.multifd_channels = params->multifd_channels;
     }
+    if (params->has_multifd_compression) {
+        s->parameters.multifd_compression = params->multifd_compression;
+    }
     if (params->has_xbzrle_cache_size) {
         s->parameters.xbzrle_cache_size = params->xbzrle_cache_size;
         xbzrle_cache_resize(params->xbzrle_cache_size, errp);
@@ -3523,6 +3532,9 @@ static Property migration_properties[] = {
     DEFINE_PROP_UINT8("multifd-channels", MigrationState,
                       parameters.multifd_channels,
                       DEFAULT_MIGRATE_MULTIFD_CHANNELS),
+    DEFINE_PROP_MULTIFD_COMPRESSION("multifd-compression", MigrationState,
+                      parameters.multifd_compression,
+                      DEFAULT_MIGRATE_MULTIFD_COMPRESSION),
     DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState,
                       parameters.xbzrle_cache_size,
                       DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE),
@@ -3613,6 +3625,7 @@ static void migration_instance_init(Object *obj)
     params->has_x_checkpoint_delay = true;
     params->has_block_incremental = true;
     params->has_multifd_channels = true;
+    params->has_multifd_compression = true;
     params->has_xbzrle_cache_size = true;
     params->has_max_postcopy_bandwidth = true;
     params->has_max_cpu_throttle = true;

monitor/hmp-cmds.c

@@ -40,6 +40,7 @@
 #include "qapi/qapi-commands-tpm.h"
 #include "qapi/qapi-commands-ui.h"
 #include "qapi/qapi-visit-net.h"
+#include "qapi/qapi-visit-migration.h"
 #include "qapi/qmp/qdict.h"
 #include "qapi/qmp/qerror.h"
 #include "qapi/string-input-visitor.h"
@@ -448,6 +449,9 @@ void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict)
         monitor_printf(mon, "%s: %u\n",
             MigrationParameter_str(MIGRATION_PARAMETER_MULTIFD_CHANNELS),
             params->multifd_channels);
+        monitor_printf(mon, "%s: %s\n",
+            MigrationParameter_str(MIGRATION_PARAMETER_MULTIFD_COMPRESSION),
+            MultiFDCompression_str(params->multifd_compression));
         monitor_printf(mon, "%s: %" PRIu64 "\n",
             MigrationParameter_str(MIGRATION_PARAMETER_XBZRLE_CACHE_SIZE),
             params->xbzrle_cache_size);
@@ -1739,6 +1743,7 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
     MigrateSetParameters *p = g_new0(MigrateSetParameters, 1);
     uint64_t valuebw = 0;
     uint64_t cache_size;
+    MultiFDCompression compress_type;
     Error *err = NULL;
     int val, ret;
 
@@ -1824,6 +1829,14 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
         p->has_multifd_channels = true;
         visit_type_int(v, param, &p->multifd_channels, &err);
         break;
+    case MIGRATION_PARAMETER_MULTIFD_COMPRESSION:
+        p->has_multifd_compression = true;
+        visit_type_MultiFDCompression(v, param, &compress_type, &err);
+        if (err) {
+            break;
+        }
+        p->multifd_compression = compress_type;
+        break;
     case MIGRATION_PARAMETER_XBZRLE_CACHE_SIZE:
         p->has_xbzrle_cache_size = true;
         visit_type_size(v, param, &cache_size, &err);

qapi/migration.json

@@ -488,6 +488,19 @@
 ##
 { 'command': 'query-migrate-capabilities', 'returns':   ['MigrationCapabilityStatus']}
 
+##
+# @MultiFDCompression:
+#
+# An enumeration of multifd compression methods.
+#
+# @none: no compression.
+#
+# Since: 5.0
+#
+##
+{ 'enum': 'MultiFDCompression',
+  'data': [ 'none' ] }
+
 ##
 # @MigrationParameter:
 #
@@ -586,6 +599,9 @@
 # @max-cpu-throttle: maximum cpu throttle percentage.
 #                    Defaults to 99. (Since 3.1)
 #
+# @multifd-compression: Which compression method to use.
+#                       Defaults to none. (Since 5.0)
+#
 # Since: 2.4
 ##
 { 'enum': 'MigrationParameter',
@@ -598,7 +614,7 @@
            'downtime-limit', 'x-checkpoint-delay', 'block-incremental',
            'multifd-channels',
            'xbzrle-cache-size', 'max-postcopy-bandwidth',
-           'max-cpu-throttle' ] }
+           'max-cpu-throttle', 'multifd-compression' ] }
 
 ##
 # @MigrateSetParameters:
@@ -688,6 +704,9 @@
 # @max-cpu-throttle: maximum cpu throttle percentage.
 #                    The default value is 99. (Since 3.1)
 #
+# @multifd-compression: Which compression method to use.
+#                       Defaults to none. (Since 5.0)
+#
 # Since: 2.4
 ##
 # TODO either fuse back into MigrationParameters, or make
@@ -713,7 +732,8 @@
             '*multifd-channels': 'int',
             '*xbzrle-cache-size': 'size',
             '*max-postcopy-bandwidth': 'size',
-            '*max-cpu-throttle': 'int' } }
+            '*max-cpu-throttle': 'int',
+            '*multifd-compression': 'MultiFDCompression' } }
 
 ##
 # @migrate-set-parameters:
@@ -823,6 +843,9 @@
 #                    Defaults to 99.
 #                    (Since 3.1)
 #
+# @multifd-compression: Which compression method to use.
+#                       Defaults to none. (Since 5.0)
+#
 # Since: 2.4
 ##
 { 'struct': 'MigrationParameters',
@@ -846,7 +869,8 @@
             '*multifd-channels': 'uint8',
             '*xbzrle-cache-size': 'size',
             '*max-postcopy-bandwidth': 'size',
-            '*max-cpu-throttle':'uint8'} }
+            '*max-cpu-throttle': 'uint8',
+            '*multifd-compression': 'MultiFDCompression' } }
 
 ##
 # @query-migrate-parameters:

tests/qtest/migration-test.c

@@ -378,7 +378,6 @@ static void migrate_check_parameter_str(QTestState *who, const char *parameter,
     g_free(result);
 }
 
-__attribute__((unused))
 static void migrate_set_parameter_str(QTestState *who, const char *parameter,
                                       const char *value)
 {
@@ -1261,7 +1260,7 @@ static void test_migrate_auto_converge(void)
     test_migrate_end(from, to, true);
 }
 
-static void test_multifd_tcp(void)
+static void test_multifd_tcp(const char *method)
 {
     MigrateStart *args = migrate_start_new();
     QTestState *from, *to;
@@ -1285,6 +1284,9 @@ static void test_multifd_tcp(void)
     migrate_set_parameter_int(from, "multifd-channels", 16);
     migrate_set_parameter_int(to, "multifd-channels", 16);
 
+    migrate_set_parameter_str(from, "multifd-compression", method);
+    migrate_set_parameter_str(to, "multifd-compression", method);
+
     migrate_set_capability(from, "multifd", "true");
     migrate_set_capability(to, "multifd", "true");
 
@@ -1316,6 +1318,11 @@ static void test_multifd_tcp(void)
     g_free(uri);
 }
 
+static void test_multifd_tcp_none(void)
+{
+    test_multifd_tcp("none");
+}
+
 /*
  * This test does:
  *  source               target
@@ -1327,7 +1334,6 @@ static void test_multifd_tcp(void)
  *
  *  And see that it works
  */
-
 static void test_multifd_tcp_cancel(void)
 {
     MigrateStart *args = migrate_start_new();
@@ -1478,7 +1484,7 @@ int main(int argc, char **argv)
                    test_validate_uuid_dst_not_set);
 
     qtest_add_func("/migration/auto_converge", test_migrate_auto_converge);
-    qtest_add_func("/migration/multifd/tcp", test_multifd_tcp);
+    qtest_add_func("/migration/multifd/tcp/none", test_multifd_tcp_none);
     qtest_add_func("/migration/multifd/tcp/cancel", test_multifd_tcp_cancel);
 
     ret = g_test_run();