Re: [PATCH RFC 01/12] migration: Add multiRDMA capability support

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Zhimin Feng (fengzhimin1@huawei.com) wrote:
> From: fengzhimin <fengzhimin1@huawei.com>
> 
> Signed-off-by: fengzhimin <fengzhimin1@huawei.com>

Instead of creating x-multirdma as a capability and the corresponding
parameter for the number of channels; it would be better just
to use the multifd parameters when used with an rdma transport;
as far as I know multifd doesn't work with rdma at the moment,
and to the user the idea of multifd over rdma is just the same thing.

Dave

> ---
>  migration/migration.c | 11 +++++++++++
>  migration/migration.h |  1 +
>  qapi/migration.json   |  4 +++-
>  3 files changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/migration/migration.c b/migration/migration.c
> index 354ad072fa..e98e236ef9 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -2176,6 +2176,15 @@ bool migrate_use_events(void)
>      return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS];
>  }
>  
> +bool migrate_use_multiRDMA(void)
> +{
> +    MigrationState *s;
> +
> +    s = migrate_get_current();
> +
> +    return s->enabled_capabilities[MIGRATION_CAPABILITY_MULTIRDMA];
> +}
> +
>  bool migrate_use_multifd(void)
>  {
>      MigrationState *s;
> @@ -3509,6 +3518,8 @@ static Property migration_properties[] = {
>      DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK),
>      DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH),
>      DEFINE_PROP_MIG_CAP("x-multifd", MIGRATION_CAPABILITY_MULTIFD),
> +    DEFINE_PROP_MIG_CAP("x-multirdma",
> +                        MIGRATION_CAPABILITY_MULTIRDMA),
>  
>      DEFINE_PROP_END_OF_LIST(),
>  };
> diff --git a/migration/migration.h b/migration/migration.h
> index 79b3dda146..bb488028a6 100644
> --- a/migration/migration.h
> +++ b/migration/migration.h
> @@ -296,6 +296,7 @@ bool migrate_ignore_shared(void);
>  bool migrate_validate_uuid(void);
>  
>  bool migrate_auto_converge(void);
> +bool migrate_use_multiRDMA(void);
>  bool migrate_use_multifd(void);
>  bool migrate_pause_before_switchover(void);
>  int migrate_multifd_channels(void);
> diff --git a/qapi/migration.json b/qapi/migration.json
> index b7348d0c8b..c995ffdc4c 100644
> --- a/qapi/migration.json
> +++ b/qapi/migration.json
> @@ -421,6 +421,8 @@
>  # @validate-uuid: Send the UUID of the source to allow the destination
>  #                 to ensure it is the same. (since 4.2)
>  #
> +# @multirdma: Use more than one channels for rdma migration. (since 4.2)
> +#
>  # Since: 1.2
>  ##
>  { 'enum': 'MigrationCapability',
> @@ -428,7 +430,7 @@
>             'compress', 'events', 'postcopy-ram', 'x-colo', 'release-ram',
>             'block', 'return-path', 'pause-before-switchover', 'multifd',
>             'dirty-bitmaps', 'postcopy-blocktime', 'late-block-activate',
> -           'x-ignore-shared', 'validate-uuid' ] }
> +           'x-ignore-shared', 'validate-uuid', 'multirdma' ] }
>  
>  ##
>  # @MigrationCapabilityStatus:
> -- 
> 2.19.1
> 
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK