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GET /api/patches/96893/?format=api
{ "id": 96893, "url": "http://patchwork.dpdk.org/api/patches/96893/?format=api", "web_url": "http://patchwork.dpdk.org/project/dpdk/patch/1628845774-48339-6-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": "<1628845774-48339-6-git-send-email-fengchengwen@huawei.com>", "list_archive_url": "https://inbox.dpdk.org/dev/1628845774-48339-6-git-send-email-fengchengwen@huawei.com", "date": "2021-08-13T09:09:33", "name": "[v15,5/6] doc: add DMA device library guide", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": true, "hash": "f2039d5f8f73dad2e118147b6e9ff8293f1abd9b", "submitter": { "id": 2146, "url":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/1628845774-48339-6-git-send-email-fengchengwen@huawei.com/mbox/", "series": [ { "id": 18278, "url": "http://patchwork.dpdk.org/api/series/18278/?format=api", "web_url": "http://patchwork.dpdk.org/project/dpdk/list/?series=18278", "date": "2021-08-13T09:09:28", "name": "support dmadev", "version": 15, "mbox": "http://patchwork.dpdk.org/series/18278/mbox/" } ], "comments": "http://patchwork.dpdk.org/api/patches/96893/comments/", "check": "success", "checks": "http://patchwork.dpdk.org/api/patches/96893/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 AB7B1A0C4D;\n\tFri, 13 Aug 2021 11:14:00 +0200 (CEST)", "from [217.70.189.124] (localhost [127.0.0.1])\n\tby mails.dpdk.org (Postfix) with ESMTP id 4DF3F4126A;\n\tFri, 13 Aug 2021 11:13:35 +0200 (CEST)", "from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187])\n by mails.dpdk.org (Postfix) with ESMTP id 6859640140\n for <dev@dpdk.org>; Fri, 13 Aug 2021 11:13:29 +0200 (CEST)", "from dggemv704-chm.china.huawei.com (unknown [172.30.72.53])\n by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4GmHnP6dfBzb1SP;\n Fri, 13 Aug 2021 17:09:45 +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; Fri, 13 Aug 2021 17:13:26 +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; Fri, 13 Aug 2021 17:13:26 +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": "Fri, 13 Aug 2021 17:09:33 +0800", "Message-ID": "<1628845774-48339-6-git-send-email-fengchengwen@huawei.com>", "X-Mailer": "git-send-email 2.8.1", "In-Reply-To": "<1628845774-48339-1-git-send-email-fengchengwen@huawei.com>", "References": "<1625231891-2963-1-git-send-email-fengchengwen@huawei.com>\n <1628845774-48339-1-git-send-email-fengchengwen@huawei.com>", "MIME-Version": "1.0", "Content-Type": "text/plain", "X-Originating-IP": "[10.67.165.24]", "X-ClientProxiedBy": "dggems701-chm.china.huawei.com (10.3.19.178) To\n dggpeml500024.china.huawei.com (7.185.36.10)", "X-CFilter-Loop": "Reflected", "Subject": "[dpdk-dev] [PATCH v15 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>\nAcked-by: Conor Walsh <conor.walsh@intel.com>\n---\n doc/guides/prog_guide/dmadev.rst | 125 ++++++++++++++++\n doc/guides/prog_guide/img/dmadev.svg | 283 +++++++++++++++++++++++++++++++++++\n doc/guides/prog_guide/index.rst | 1 +\n 3 files changed, 409 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..75bac04\n--- /dev/null\n+++ b/doc/guides/prog_guide/dmadev.rst\n@@ -0,0 +1,125 @@\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 controllers are discovered during the PCI probe/enumeration of the\n+EAL function which is executed at DPDK initialization, this is based on their\n+PCI BDF (bus/bridge, device, function). Specific physical DMA controllers, like\n+other physical devices in DPDK can be listed using the EAL command line options.\n+\n+The dmadevs are dynamically allocated by using the API\n+``rte_dmadev_pmd_allocate`` based on 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 sets. The ``rte_dmadev_info_get`` API\n+can be used to get the device info and supported features.\n+\n+Silent mode is a special device capability which does not require the\n+application to invoke dequeue APIs.\n+\n+\n+Enqueue / Dequeue APIs\n+~~~~~~~~~~~~~~~~~~~~~~\n+\n+Enqueue APIs such as ``rte_dmadev_copy`` and ``rte_dmadev_fill`` can be used to\n+enqueue operations to hardware. If an enqueue is successful, a ``ring_idx`` is\n+returned. This ``ring_idx`` can be used by applications to track per-operation\n+metadata in an application-defined circular ring.\n+\n+The ``rte_dmadev_submit`` API is used to issue doorbell to hardware.\n+Alternatively the ``RTE_DMA_OP_FLAG_SUBMIT`` flag can be passed to the enqueue\n+APIs to also issue the doorbell to hardware.\n+\n+There are two dequeue APIs ``rte_dmadev_completed`` and\n+``rte_dmadev_completed_status``, these are used to obtain the results of\n+the enqueue requests. ``rte_dmadev_completed`` will return the number of\n+successfully completed operations. ``rte_dmadev_completed_status`` will return\n+the number of completed operations along with the status of each operation\n+(filled into the ``status`` array passed by user). These two APIs can also\n+return the last completed operation's ``ring_idx`` which could help user track\n+operations within their own application-defined rings.\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+ 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id=\"path45956\"\n+ inkscape:connector-type=\"polyline\"\n+ inkscape:connector-curvature=\"0\"\n+ inkscape:connection-start=\"#rect31-9-5-3\"\n+ inkscape:connection-end=\"#rect31-9-5-8-5\" />\n+ </g>\n+</svg>\ndiff --git 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": [ "v15", "5/6" ] }