linux-kernel - RE: [EXT] Re: [V5 1/2] dmaengine: fsl-dpaa2-qdma: Add the DPDMAI(Data Path DMA Interface) support

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Date:   Thu, 17 Oct 2019 06:15:31 +0000
From:   Peng Ma <peng.ma@....com>
To:     Vinod Koul <vkoul@...nel.org>
CC:     "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        Leo Li <leoyang.li@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>
Subject: RE: [EXT] Re: [V5 1/2] dmaengine: fsl-dpaa2-qdma: Add the DPDMAI(Data
 Path DMA Interface) support

Hi Vinod,

Thanks very much for your reply.

Best Regards,
Peng
>-----Original Message-----
>From: Vinod Koul <vkoul@...nel.org>
>Sent: 2019年10月17日 12:11
>To: Peng Ma <peng.ma@....com>
>Cc: dan.j.williams@...el.com; Leo Li <leoyang.li@....com>;
>linux-kernel@...r.kernel.org; dmaengine@...r.kernel.org
>Subject: [EXT] Re: [V5 1/2] dmaengine: fsl-dpaa2-qdma: Add the DPDMAI(Data
>Path DMA Interface) support
>
>Caution: EXT Email
>
>On 30-09-19, 02:04, Peng Ma wrote:
>> The MC(Management Complex) exports the DPDMAI(Data Path DMA
>Interface)
>> object as an interface to operate the DPAA2(Data Path Acceleration
>> Architecture 2) qDMA Engine. The DPDMAI enables sending frame-based
>> requests to qDMA and receiving back confirmation response on
>> transaction completion, utilizing the DPAA2 QBMan(Queue Manager and
>> Buffer Manager
>> hardware) infrastructure. DPDMAI object provides up to two priorities
>> for processing qDMA requests.
>> The following list summarizes the DPDMAI main features and capabilities:
>>       1. Supports up to two scheduling priorities for processing
>>       service requests.
>>       - Each DPDMAI transmit queue is mapped to one of two service
>>       priorities, allowing further prioritization in hardware between
>>       requests from different DPDMAI objects.
>>       2. Supports up to two receive queues for incoming transaction
>>       completion confirmations.
>>       - Each DPDMAI receive queue is mapped to one of two receive
>>       priorities, allowing further prioritization between other
>>       interfaces when associating the DPDMAI receive queues to DPIO
>>       or DPCON(Data Path Concentrator) objects.
>>       3. Supports different scheduling options for processing received
>>       packets:
>>       - Queues can be configured either in 'parked' mode (default),
>>       or attached to a DPIO object, or attached to DPCON object.
>>       4. Allows interaction with one or more DPIO objects for
>>       dequeueing/enqueueing frame descriptors(FD) and for
>>       acquiring/releasing buffers.
>>       5. Supports enable, disable, and reset operations.
>>
>> Add dpdmai to support some platforms with dpaa2 qdma engine.
>
>Applied both, thanks
>
>--
>~Vinod