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[ { "id": 116629, "web_url": "https://patches.dpdk.org/comment/116629/", "msgid": "<MN2PR11MB4063B5C851F4CA4AE78C02729C740@MN2PR11MB4063.namprd11.prod.outlook.com>", "list_archive_url": "https://inbox.dpdk.org/dev/MN2PR11MB4063B5C851F4CA4AE78C02729C740@MN2PR11MB4063.namprd11.prod.outlook.com", "date": "2020-07-25T06:58:54", "subject": "Re: [dpdk-dev] [PATCH v2 1/2] doc: update guides for vhost async\n\tAPIs", "submitter": { "id": 1276, "url": "https://patches.dpdk.org/api/people/1276/?format=api", "name": "Chenbo Xia", "email": "chenbo.xia@intel.com" }, "content": "> -----Original Message-----\n> From: Fu, Patrick <patrick.fu@intel.com>\n> Sent: Wednesday, July 22, 2020 11:02 PM\n> To: dev@dpdk.org; maxime.coquelin@redhat.com; Xia, Chenbo\n> <chenbo.xia@intel.com>\n> Cc: Fu, Patrick <patrick.fu@intel.com>\n> Subject: [PATCH v2 1/2] doc: update guides for vhost async APIs\n> \n> From: Patrick Fu <patrick.fu@intel.com>\n> \n> Update vhost guides to document vhost async APIs\n> \n> Signed-off-by: Patrick Fu <patrick.fu@intel.com>\n> ---\n> doc/guides/prog_guide/vhost_lib.rst | 86 ++++++++++++++++++++++++++---\n> 1 file changed, 77 insertions(+), 9 deletions(-)\n> \n> diff --git a/doc/guides/prog_guide/vhost_lib.rst\n> b/doc/guides/prog_guide/vhost_lib.rst\n> index db921f922..b892eec67 100644\n> --- a/doc/guides/prog_guide/vhost_lib.rst\n> +++ b/doc/guides/prog_guide/vhost_lib.rst\n> @@ -147,6 +147,21 @@ The following is an overview of some key Vhost API\n> functions:\n> \n> It is disabled by default.\n> \n> + - ``RTE_VHOST_USER_ASYNC_COPY``\n> +\n> + Asynchronous data path will be enabled when this flag is set. Async data\n> + path allows applications to register async copy devices (typically\n> + hardware DMA channels) to the vhost queues. Vhost leverages the copy\n> + device registered to free CPU from memory copy operations. A set of\n> + async data path APIs are defined for DPDK applications to make use of\n> + the async capability. Only packets enqueued/dequeued by async APIs are\n> + processed through the async data path.\n> +\n> + Currently this feature is only implemented on split ring enqueue data\n> + path.\n> +\n> + It is disabled by default.\n> +\n> * ``rte_vhost_driver_set_features(path, features)``\n> \n> This function sets the feature bits the vhost-user driver supports. The @@ -\n> 235,6 +250,59 @@ The following is an overview of some key Vhost API\n> functions:\n> \n> Enable or disable zero copy feature of the vhost crypto backend.\n> \n> +* ``rte_vhost_async_channel_register(vid, queue_id, features, ops)``\n> +\n> + Register a vhost queue with async copy device channel.\n> + Following device ``features`` must be specified together with the\n> + registration:\n> +\n> + * ``async_inorder``\n> +\n> + Async copy device can guarantee the ordering of copy completion\n> + sequence. Copies are completed in the same order with that at\n> + the submission time.\n> +\n> + Currently, only ``async_inorder`` capable device is supported by vhost.\n> +\n> + * ``async_threshold``\n> +\n> + The copy length (in bytes) below which CPU copy will be used even if\n> + applications call async vhost APIs to enqueue/dequeue data.\n> +\n> + Typical value is 512~1024 depending on the async device capability.\n> +\n> + Applications must provide following ``ops`` callbacks for vhost lib\n> + to work with the async copy devices:\n> +\n> + * ``transfer_data(vid, queue_id, descs, opaque_data, count)``\n> +\n> + vhost invokes this function to submit copy data to the async devices.\n> + For non-async_inorder capable devices, ``opaque_data`` could be used\n> + for identifying the completed packets.\n> +\n> + * ``check_completed_copies(vid, queue_id, opaque_data, max_packets)``\n> +\n> + vhost invokes this function to get the copy data completed by async\n> + devices.\n> +\n> +* ``rte_vhost_async_channel_unregister(vid, queue_id)``\n> +\n> + Unregister the async copy device channel from a vhost queue.\n> +\n> +* ``rte_vhost_submit_enqueue_burst(vid, queue_id, pkts, count)``\n> +\n> + Submit an enqueue request to transmit ``count`` packets from host to\n> + guest by async data path. Enqueue is not guaranteed to finish upon\n> + the return of this API call.\n> +\n> + Applications must not free the packets submitted for enqueue until\n> + the packets are completed.\n> +\n> +* ``rte_vhost_poll_enqueue_completed(vid, queue_id, pkts, count)``\n> +\n> + Poll enqueue completion status from async data path. Completed\n> + packets are returned to applications through ``pkts``.\n> +\n> Vhost-user Implementations\n> --------------------------\n> \n> @@ -294,16 +362,16 @@ Guest memory requirement\n> \n> * Memory pre-allocation\n> \n> - For non-zerocopy, guest memory pre-allocation is not a must. This can help\n> - save of memory. If users really want the guest memory to be pre-allocated\n> - (e.g., for performance reason), we can add option ``-mem-prealloc`` when\n> - starting QEMU. Or, we can lock all memory at vhost side which will force\n> - memory to be allocated when mmap at vhost side; option --mlockall in\n> - ovs-dpdk is an example in hand.\n> + For non-zerocopy non-async data path, guest memory pre-allocation is\n> + not a must. This can help save of memory. If users really want the\n> + guest memory to be pre-allocated (e.g., for performance reason), we\n> + can add option ``-mem-prealloc`` when starting QEMU. Or, we can lock\n> + all memory at vhost side which will force memory to be allocated when\n> + mmap at vhost side; option --mlockall in ovs-dpdk is an example in hand.\n> \n> - For zerocopy, we force the VM memory to be pre-allocated at vhost lib when\n> - mapping the guest memory; and also we need to lock the memory to prevent\n> - pages being swapped out to disk.\n> + For async and zerocopy data path, we force the VM memory to be\n> + pre-allocated at vhost lib when mapping the guest memory; and also we\n> + need to lock the memory to prevent pages being swapped out to disk.\n> \n> * Memory sharing\n> \n> --\n> 2.18.4\n\nReviewed-by: Chenbo Xia <chenbo.xia@intel.com>", "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@inbox.dpdk.org", "Delivered-To": "patchwork@inbox.dpdk.org", "Received": [ "from dpdk.org (dpdk.org [92.243.14.124])\n\tby inbox.dpdk.org (Postfix) with ESMTP id EDA64A052A;\n\tSat, 25 Jul 2020 08:59:02 +0200 (CEST)", "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id 798F51C025;\n\tSat, 25 Jul 2020 08:59:01 +0200 (CEST)", "from mga03.intel.com (mga03.intel.com [134.134.136.65])\n by dpdk.org (Postfix) with ESMTP id D3D0CE07\n for <dev@dpdk.org>; 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Linux x86_64; rv:68.0) Gecko/20100101\n Thunderbird/68.10.0", "MIME-Version": "1.0", "In-Reply-To": "<20200722150153.3422450-2-patrick.fu@intel.com>", "Content-Language": "en-US", "X-Scanned-By": "MIMEDefang 2.84 on 10.5.11.23", "X-Mimecast-Spam-Score": "0", "X-Mimecast-Originator": "redhat.com", "Content-Type": "text/plain; charset=utf-8", "Content-Transfer-Encoding": "7bit", "Subject": "Re: [dpdk-dev] [PATCH v2 1/2] doc: update guides for vhost async\n\tAPIs", "X-BeenThere": "dev@dpdk.org", "X-Mailman-Version": "2.1.15", "Precedence": "list", "List-Id": "DPDK patches and discussions <dev.dpdk.org>", "List-Unsubscribe": "<https://mails.dpdk.org/options/dev>,\n <mailto:dev-request@dpdk.org?subject=unsubscribe>", "List-Archive": "<http://mails.dpdk.org/archives/dev/>", "List-Post": "<mailto:dev@dpdk.org>", "List-Help": "<mailto:dev-request@dpdk.org?subject=help>", "List-Subscribe": "<https://mails.dpdk.org/listinfo/dev>,\n <mailto:dev-request@dpdk.org?subject=subscribe>", "Errors-To": "dev-bounces@dpdk.org", "Sender": "\"dev\" <dev-bounces@dpdk.org>" }, "addressed": null } ]