From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=roPk=MM=dpdk.org=dev-bounces@kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	aws-us-west-2-korg-lkml-1.web.codeaurora.org
X-Spam-Level: 
X-Spam-Status: No, score=-8.8 required=3.0 tests=BAYES_00,
	HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,
	SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no
	version=3.4.0
Received: from mail.kernel.org (mail.kernel.org [198.145.29.99])
	by smtp.lore.kernel.org (Postfix) with ESMTP id 1E690C07E95
	for <dpdk-dev@archiver.kernel.org>; Tue, 20 Jul 2021 12:06:07 +0000 (UTC)
Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124])
	by mail.kernel.org (Postfix) with ESMTP id A2B6E61164
	for <dpdk-dev@archiver.kernel.org>; Tue, 20 Jul 2021 12:06:06 +0000 (UTC)
DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A2B6E61164
Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com
Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=dev-bounces@dpdk.org
Received: from [217.70.189.124] (localhost [127.0.0.1])
	by mails.dpdk.org (Postfix) with ESMTP id 963A940689;
	Tue, 20 Jul 2021 14:06:05 +0200 (CEST)
Received: from mga02.intel.com (mga02.intel.com [134.134.136.20])
 by mails.dpdk.org (Postfix) with ESMTP id A788940140
 for <dev@dpdk.org>; Tue, 20 Jul 2021 14:06:04 +0200 (CEST)
X-IronPort-AV: E=McAfee;i="6200,9189,10050"; a="198424229"
X-IronPort-AV: E=Sophos;i="5.84,254,1620716400"; d="scan'208";a="198424229"
Received: from fmsmga006.fm.intel.com ([10.253.24.20])
 by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384;
 20 Jul 2021 05:06:00 -0700
X-IronPort-AV: E=Sophos;i="5.84,254,1620716400"; d="scan'208";a="657513432"
Received: from bricha3-mobl.ger.corp.intel.com ([10.252.7.183])
 by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-SHA;
 20 Jul 2021 05:05:57 -0700
Date: Tue, 20 Jul 2021 13:05:54 +0100
From: Bruce Richardson <bruce.richardson@intel.com>
To: Chengwen Feng <fengchengwen@huawei.com>
Cc: thomas@monjalon.net, ferruh.yigit@intel.com, jerinj@marvell.com,
 jerinjacobk@gmail.com, andrew.rybchenko@oktetlabs.ru, dev@dpdk.org,
 mb@smartsharesystems.com, nipun.gupta@nxp.com,
 hemant.agrawal@nxp.com, maxime.coquelin@redhat.com,
 honnappa.nagarahalli@arm.com, david.marchand@redhat.com,
 sburla@marvell.com, pkapoor@marvell.com, konstantin.ananyev@intel.com
Message-ID: <YPa8Io29o3P57N43@bricha3-MOBL.ger.corp.intel.com>
References: <1625231891-2963-1-git-send-email-fengchengwen@huawei.com>
 <1626779572-31328-1-git-send-email-fengchengwen@huawei.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1626779572-31328-1-git-send-email-fengchengwen@huawei.com>
Subject: Re: [dpdk-dev] [PATCH v9] dmadev: introduce DMA device library
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>,
 <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>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
Errors-To: dev-bounces@dpdk.org
Sender: "dev" <dev-bounces@dpdk.org>

On Tue, Jul 20, 2021 at 07:12:52PM +0800, Chengwen Feng wrote:
> This patch introduce 'dmadevice' which is a generic type of DMA
> device.
> 
> The APIs of dmadev library exposes some generic operations which can
> enable configuration and I/O with the DMA devices.
> 
> Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>

Apologies for late feedback. Just reporting issues as I find them working
with the code.

/Bruce

> ---
<snip>
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Returns the number of operations that have been completed, and the
> + * operations result may succeed or fail.
> + *
> + * @param dev_id
> + *   The identifier of the device.
> + * @param vchan
> + *   The identifier of virtual DMA channel.
> + * @param nb_cpls
> + *   Indicates the size of status array.
> + * @param[out] last_idx
> + *   The last completed operation's index.
> + *   If not required, NULL can be passed in.
> + * @param[out] status
> + *   The error code of operations that completed.
> + *   @see enum rte_dma_status_code

The documentation should make it clear that this is an array with "nb_cpls"
entries.

> + *
> + * @return
> + *   The number of operations that completed. This return value must be less
> + *   than or equal to the value of nb_cpls.

also update this to report that the appropriate number of "status" entries
have been filled out.

> + */
> +__rte_experimental
> +static inline uint16_t
> +rte_dmadev_completed_status(uint16_t dev_id, uint16_t vchan,
> +			    const uint16_t nb_cpls, uint16_t *last_idx,
> +			    enum rte_dma_status_code *status)
<snip>