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GET /api/patches/96612/?format=api
{ "id": 96612, "url": "http://patchwork.dpdk.org/api/patches/96612/?format=api", "web_url": "http://patchwork.dpdk.org/project/dpdk/patch/1627990189-36531-6-git-send-email-fengchengwen@huawei.com/", "project": { "id": 1, "url": "http://patchwork.dpdk.org/api/projects/1/?format=api", "name": "DPDK", "link_name": "dpdk", "list_id": "dev.dpdk.org", "list_email": "dev@dpdk.org", "web_url": "http://core.dpdk.org", "scm_url": "git://dpdk.org/dpdk", "webscm_url": "http://git.dpdk.org/dpdk", "list_archive_url": "https://inbox.dpdk.org/dev", "list_archive_url_format": "https://inbox.dpdk.org/dev/{}", "commit_url_format": "" }, "msgid": "<1627990189-36531-6-git-send-email-fengchengwen@huawei.com>", "list_archive_url": "https://inbox.dpdk.org/dev/1627990189-36531-6-git-send-email-fengchengwen@huawei.com", "date": "2021-08-03T11:29:48", "name": "[v13,5/6] doc: add DMA device library guide", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": true, "hash": "9e9d45e5529f1edc50768686b22242aca86ff87b", "submitter": { "id": 2146, "url": "http://patchwork.dpdk.org/api/people/2146/?format=api", "name": "fengchengwen", "email": "fengchengwen@huawei.com" }, "delegate": { "id": 1, "url": "http://patchwork.dpdk.org/api/users/1/?format=api", "username": "tmonjalo", "first_name": "Thomas", "last_name": "Monjalon", "email": "thomas@monjalon.net" }, "mbox": "http://patchwork.dpdk.org/project/dpdk/patch/1627990189-36531-6-git-send-email-fengchengwen@huawei.com/mbox/", "series": [ { "id": 18161, "url": "http://patchwork.dpdk.org/api/series/18161/?format=api", "web_url": "http://patchwork.dpdk.org/project/dpdk/list/?series=18161", "date": "2021-08-03T11:29:47", "name": "support dmadev", "version": 13, "mbox": "http://patchwork.dpdk.org/series/18161/mbox/" } ], "comments": "http://patchwork.dpdk.org/api/patches/96612/comments/", "check": "warning", "checks": "http://patchwork.dpdk.org/api/patches/96612/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@inbox.dpdk.org", "Delivered-To": "patchwork@inbox.dpdk.org", "Received": [ "from mails.dpdk.org (mails.dpdk.org [217.70.189.124])\n\tby inbox.dpdk.org (Postfix) with ESMTP id 71BEFA0A0C;\n\tTue, 3 Aug 2021 13:34:20 +0200 (CEST)", "from [217.70.189.124] (localhost [127.0.0.1])\n\tby mails.dpdk.org (Postfix) with ESMTP id 1752F411FC;\n\tTue, 3 Aug 2021 13:33:46 +0200 (CEST)", "from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188])\n by mails.dpdk.org (Postfix) with ESMTP id 3291240E3C\n for <dev@dpdk.org>; Tue, 3 Aug 2021 13:33:38 +0200 (CEST)", "from dggemv703-chm.china.huawei.com (unknown [172.30.72.56])\n by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4GfCMX57Cqz83T0;\n Tue, 3 Aug 2021 19:29:44 +0800 (CST)", "from dggpeml500024.china.huawei.com (7.185.36.10) by\n dggemv703-chm.china.huawei.com (10.3.19.46) with Microsoft SMTP Server\n (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id\n 15.1.2176.2; Tue, 3 Aug 2021 19:33:35 +0800", "from localhost.localdomain (10.67.165.24) by\n dggpeml500024.china.huawei.com (7.185.36.10) with Microsoft SMTP Server\n (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id\n 15.1.2176.2; Tue, 3 Aug 2021 19:33:34 +0800" ], "From": "Chengwen Feng <fengchengwen@huawei.com>", "To": "<thomas@monjalon.net>, <ferruh.yigit@intel.com>,\n <bruce.richardson@intel.com>, <jerinj@marvell.com>, <jerinjacobk@gmail.com>,\n <andrew.rybchenko@oktetlabs.ru>", "CC": "<dev@dpdk.org>, <mb@smartsharesystems.com>, <nipun.gupta@nxp.com>,\n <hemant.agrawal@nxp.com>, <maxime.coquelin@redhat.com>,\n <honnappa.nagarahalli@arm.com>, <david.marchand@redhat.com>,\n <sburla@marvell.com>, <pkapoor@marvell.com>, <konstantin.ananyev@intel.com>", "Date": "Tue, 3 Aug 2021 19:29:48 +0800", "Message-ID": "<1627990189-36531-6-git-send-email-fengchengwen@huawei.com>", "X-Mailer": "git-send-email 2.8.1", "In-Reply-To": "<1627990189-36531-1-git-send-email-fengchengwen@huawei.com>", "References": "<1625231891-2963-1-git-send-email-fengchengwen@huawei.com>\n <1627990189-36531-1-git-send-email-fengchengwen@huawei.com>", "MIME-Version": "1.0", "Content-Type": "text/plain", "X-Originating-IP": "[10.67.165.24]", "X-ClientProxiedBy": "dggems702-chm.china.huawei.com (10.3.19.179) To\n dggpeml500024.china.huawei.com (7.185.36.10)", "X-CFilter-Loop": "Reflected", "Subject": "[dpdk-dev] [PATCH v13 5/6] doc: add DMA device library guide", "X-BeenThere": "dev@dpdk.org", "X-Mailman-Version": "2.1.29", "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>" }, "content": "This patch adds dmadev library guide.\n\nSigned-off-by: Chengwen Feng <fengchengwen@huawei.com>\n---\n doc/guides/prog_guide/dmadev.rst | 126 +++++++++++++++\n doc/guides/prog_guide/img/dmadev_i1.svg | 278 ++++++++++++++++++++++++++++++++\n doc/guides/prog_guide/index.rst | 1 +\n 3 files changed, 405 insertions(+)\n create mode 100644 doc/guides/prog_guide/dmadev.rst\n create mode 100644 doc/guides/prog_guide/img/dmadev_i1.svg", "diff": "diff --git a/doc/guides/prog_guide/dmadev.rst b/doc/guides/prog_guide/dmadev.rst\nnew file mode 100644\nindex 0000000..c6327db\n--- /dev/null\n+++ b/doc/guides/prog_guide/dmadev.rst\n@@ -0,0 +1,126 @@\n+.. SPDX-License-Identifier: BSD-3-Clause\n+ Copyright 2021 HiSilicon Limited\n+\n+DMA Device Library\n+====================\n+\n+The DMA library provides a DMA device framework for management and provisioning\n+of hardware and software DMA poll mode drivers, defining generic APIs which\n+support a number of different DMA operations.\n+\n+\n+Design Principles\n+-----------------\n+\n+The DMA library follows the same basic principles as those used in DPDK's\n+Ethernet Device framework and the RegEx framework. The DMA framework provides\n+a generic DMA device framework which supports both physical (hardware)\n+and virtual (software) DMA devices as well as a generic DMA API which allows\n+DMA devices to be managed and configured and supports DMA operations to be\n+provisioned on DMA poll mode driver.\n+\n+.. _figure_dmadev_i1:\n+\n+.. figure:: img/dmadev_i1.*\n+\n+ The model of the DMA framework built on\n+\n+ * The DMA controller could have multiple hardware DMA channels (aka. hardware\n+ DMA queues), each hardware DMA channel should be represented by a dmadev.\n+ * The dmadev could create multiple virtual DMA channels, each virtual DMA\n+ channel represents a different transfer context. The DMA operation request\n+ must be submitted to the virtual DMA channel. e.g. Application could create\n+ virtual DMA channel 0 for memory-to-memory transfer scenario, and create\n+ virtual DMA channel 1 for memory-to-device transfer scenario.\n+\n+\n+Device Management\n+-----------------\n+\n+Device Creation\n+~~~~~~~~~~~~~~~\n+\n+Physical DMA controller is discovered during the PCI probe/enumeration of the\n+EAL function which is executed at DPDK initialization, based on their PCI\n+device identifier, each unique PCI BDF (bus/bridge, device, function). Specific\n+physical DMA controller, like other physical devices in DPDK can be listed using\n+the EAL command line options.\n+\n+And then dmadevs are dynamically allocated by rte_dmadev_pmd_allocate() based on\n+the number of hardware DMA channels.\n+\n+\n+Device Identification\n+~~~~~~~~~~~~~~~~~~~~~\n+\n+Each DMA device, whether physical or virtual is uniquely designated by two\n+identifiers:\n+\n+- A unique device index used to designate the DMA device in all functions\n+ exported by the DMA API.\n+\n+- A device name used to designate the DMA device in console messages, for\n+ administration or debugging purposes.\n+\n+\n+Device Configuration\n+~~~~~~~~~~~~~~~~~~~~\n+\n+The rte_dmadev_configure API is used to configure a DMA device.\n+\n+.. code-block:: c\n+\n+ int rte_dmadev_configure(uint16_t dev_id,\n+ const struct rte_dmadev_conf *dev_conf);\n+\n+The ``rte_dmadev_conf`` structure is used to pass the configuration parameters\n+for the DMA device for example maximum number of virtual DMA channels,\n+indication of whether to enable silent mode.\n+\n+\n+Configuration of Virtual DMA Channels\n+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n+\n+The rte_dmadev_vchan_setup API is used to configure a virtual DMA channel.\n+\n+.. code-block:: c\n+\n+ int rte_dmadev_vchan_setup(uint16_t dev_id,\n+\t\t const struct rte_dmadev_vchan_conf *conf);\n+\n+The ``rte_dmadev_vchan_conf`` structure is used to pass the configuration\n+parameters for the virtual DMA channel for example transfer direction, number of\n+descriptor for the virtual DMA channel, source device access port parameter,\n+destination device access port parameter.\n+\n+\n+Device Features and Capabilities\n+--------------------------------\n+\n+DMA devices may support different feature set. In order to get the supported PMD\n+features ``rte_dmadev_info_get`` API which returns the info of the device and\n+it's supported features.\n+\n+A special device capability is silent mode which application don't required to\n+invoke dequeue APIs.\n+\n+\n+Enqueue / Dequeue APIs\n+~~~~~~~~~~~~~~~~~~~~~~\n+\n+The enqueue APIs include like ``rte_dmadev_copy`` and ``rte_dmadev_fill``, if\n+enqueue successful, an uint16_t ring_idx is returned. This ring_idx can be used\n+by applications to track per-operation metadata in an application defined\n+circular ring.\n+\n+The ``rte_dmadev_submit`` API was used to issue doorbell to hardware, and also\n+there are flags (``RTE_DMA_OP_FLAG_SUBMIT``) parameter of the enqueue APIs\n+could do the same work.\n+\n+There are two dequeue APIs (``rte_dmadev_completed`` and\n+``rte_dmadev_completed_status``) could used to obtain the result of request.\n+The first API returns the number of operation requests completed successfully,\n+the second API returns the number of operation requests completed which may\n+successfully or failed and also with meaningful status code. Also these two\n+APIs could return the last completed operation's ring_idx which will help to\n+track application-defined circular ring.\ndiff --git a/doc/guides/prog_guide/img/dmadev_i1.svg b/doc/guides/prog_guide/img/dmadev_i1.svg\nnew file mode 100644\nindex 0000000..b305beb\n--- /dev/null\n+++ b/doc/guides/prog_guide/img/dmadev_i1.svg\n@@ -0,0 +1,278 @@\n+<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n+<!-- Created with Inkscape (http://www.inkscape.org/) -->\n+\n+<svg\n+ width=\"206.19344mm\"\n+ height=\"168.97479mm\"\n+ viewBox=\"0 0 206.19344 168.97479\"\n+ version=\"1.1\"\n+ id=\"svg934\"\n+ inkscape:version=\"1.1 (c68e22c387, 2021-05-23)\"\n+ sodipodi:docname=\"dmadev_i1.svg\"\n+ xmlns:inkscape=\"http://www.inkscape.org/namespaces/inkscape\"\n+ xmlns:sodipodi=\"http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd\"\n+ xmlns=\"http://www.w3.org/2000/svg\"\n+ xmlns:svg=\"http://www.w3.org/2000/svg\">\n+ <sodipodi:namedview\n+ id=\"namedview936\"\n+ 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a/doc/guides/prog_guide/index.rst b/doc/guides/prog_guide/index.rst\nindex 2dce507..0abea06 100644\n--- a/doc/guides/prog_guide/index.rst\n+++ b/doc/guides/prog_guide/index.rst\n@@ -29,6 +29,7 @@ Programmer's Guide\n regexdev\n rte_security\n rawdev\n+ dmadev\n link_bonding_poll_mode_drv_lib\n timer_lib\n hash_lib\n", "prefixes": [ "v13", "5/6" ] }