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GET /api/patches/96783/?format=api
http://patchwork.dpdk.org/api/patches/96783/?format=api", "web_url": "http://patchwork.dpdk.org/project/dpdk/patch/1628596454-32918-6-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": "<1628596454-32918-6-git-send-email-fengchengwen@huawei.com>", "list_archive_url": "https://inbox.dpdk.org/dev/1628596454-32918-6-git-send-email-fengchengwen@huawei.com", "date": "2021-08-10T11:54:13", "name": "[v14,5/6] doc: add DMA device library guide", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": true, "hash": "0091811aeb939be2085d814f566936ae0b3e9d25", "submitter": { "id": 2146, "url":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/1628596454-32918-6-git-send-email-fengchengwen@huawei.com/mbox/", "series": [ { "id": 18248, "url": "http://patchwork.dpdk.org/api/series/18248/?format=api", "web_url": "http://patchwork.dpdk.org/project/dpdk/list/?series=18248", "date": "2021-08-10T11:54:08", "name": "support dmadev", "version": 14, "mbox": "http://patchwork.dpdk.org/series/18248/mbox/" } ], "comments": "http://patchwork.dpdk.org/api/patches/96783/comments/", "check": "success", "checks": "http://patchwork.dpdk.org/api/patches/96783/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 70D01A0C4C;\n\tTue, 10 Aug 2021 13:58:41 +0200 (CEST)", "from [217.70.189.124] (localhost [127.0.0.1])\n\tby mails.dpdk.org (Postfix) with ESMTP id DFB09411DC;\n\tTue, 10 Aug 2021 13:58:14 +0200 (CEST)", "from szxga03-in.huawei.com (szxga03-in.huawei.com [45.249.212.189])\n by mails.dpdk.org (Postfix) with ESMTP id 0C4794114F\n for <dev@dpdk.org>; Tue, 10 Aug 2021 13:58:06 +0200 (CEST)", "from dggemv704-chm.china.huawei.com (unknown [172.30.72.55])\n by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4GkWYF70Wfz843P;\n Tue, 10 Aug 2021 19:53:05 +0800 (CST)", "from dggpeml500024.china.huawei.com (7.185.36.10) by\n dggemv704-chm.china.huawei.com (10.3.19.47) with Microsoft SMTP Server\n (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id\n 15.1.2176.2; Tue, 10 Aug 2021 19:58:03 +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, 10 Aug 2021 19:58:03 +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, 10 Aug 2021 19:54:13 +0800", "Message-ID": "<1628596454-32918-6-git-send-email-fengchengwen@huawei.com>", "X-Mailer": "git-send-email 2.8.1", "In-Reply-To": "<1628596454-32918-1-git-send-email-fengchengwen@huawei.com>", "References": "<1625231891-2963-1-git-send-email-fengchengwen@huawei.com>\n <1628596454-32918-1-git-send-email-fengchengwen@huawei.com>", "MIME-Version": "1.0", "Content-Type": "text/plain", "X-Originating-IP": "[10.67.165.24]", "X-ClientProxiedBy": "dggems705-chm.china.huawei.com (10.3.19.182) To\n dggpeml500024.china.huawei.com (7.185.36.10)", "X-CFilter-Loop": "Reflected", "Subject": "[dpdk-dev] [PATCH v14 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.svg | 283 +++++++++++++++++++++++++++++++++++\n doc/guides/prog_guide/index.rst | 1 +\n 3 files changed, 410 insertions(+)\n create mode 100644 doc/guides/prog_guide/dmadev.rst\n create mode 100644 doc/guides/prog_guide/img/dmadev.svg", "diff": "diff --git a/doc/guides/prog_guide/dmadev.rst b/doc/guides/prog_guide/dmadev.rst\nnew file mode 100644\nindex 0000000..6e8cce0\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:\n+\n+.. figure:: img/dmadev.*\n+\n+The above figure shows the model on which the DMA framework is 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 the number of virtual DMA channels to set up,\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, uint16_t vchan,\n+ 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.svg b/doc/guides/prog_guide/img/dmadev.svg\nnew file mode 100644\nindex 0000000..157d7eb\n--- /dev/null\n+++ b/doc/guides/prog_guide/img/dmadev.svg\n@@ -0,0 +1,283 @@\n+<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n+<!-- Created with Inkscape (http://www.inkscape.org/) -->\n+\n+<!-- SPDX-License-Identifier: BSD-3-Clause -->\n+<!-- Copyright(c) 2021 HiSilicon Limited -->\n+\n+<svg\n+ width=\"128.64288mm\"\n+ height=\"95.477707mm\"\n+ viewBox=\"0 0 192.96433 143.21656\"\n+ version=\"1.1\"\n+ id=\"svg934\"\n+ inkscape:version=\"1.1 (c68e22c387, 2021-05-23)\"\n+ sodipodi:docname=\"dmadev.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+ 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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": [ "v14", "5/6" ] }{ "id": 96783, "url": "