[PATCH v0 1/1] doc: announce inter-device DMA capability support in dmadev

[PATCH v0 1/1] doc: announce inter-device DMA capability support in dmadev

[Vamsi Krishna]

From: Vamsi Attunuru <vattunuru@marvell.com>

Modern DMA hardware supports data transfer between multiple
DMA devices, enabling data communication across isolated domains or
containers. To facilitate this, the ``dmadev`` library requires changes
to allow devices to register with or unregisters from DMA groups for
inter-device communication. This feature is planned for inclusion
in DPDK 25.11.

Signed-off-by: Vamsi Attunuru <vattunuru@marvell.com>
---
 doc/guides/rel_notes/deprecation.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
index e2d4125308..46836244dd 100644
--- a/doc/guides/rel_notes/deprecation.rst
+++ b/doc/guides/rel_notes/deprecation.rst
@@ -152,3 +152,10 @@ Deprecation Notices
 * bus/vmbus: Starting DPDK 25.11, all the vmbus API defined in
   ``drivers/bus/vmbus/rte_bus_vmbus.h`` will become internal to DPDK.
   Those API functions are used internally by DPDK core and netvsc PMD.
+
+* dmadev: a new capability flag ``RTE_DMA_CAPA_INTER_DEV`` will be added
+  to advertise DMA device's inter-device DMA copy capability. To enable
+  this functionality, a few dmadev APIs will be added to configure the DMA
+  access groups, facilitating coordinated data communication between devices.
+  A new ``dev_idx`` field will be added to the ``struct rte_dma_vchan_conf``
+  structure to configure a vchan for data transfers between any two DMA devices.
-- 
2.34.1

RE: [PATCH v0 1/1] doc: announce inter-device DMA capability support in dmadev

[Vamsi Krishna Attunuru]

Hi,

Gentle ping for reviews.

>-----Original Message-----
>From: Vamsi Krishna <vattunuru@marvell.com>
>Sent: Thursday, July 10, 2025 2:21 PM
>To: dev@dpdk.org; fengchengwen@huawei.com; Pavan Nikhilesh
>Bhagavatula <pbhagavatula@marvell.com>; kevin.laatz@intel.com;
>bruce.richardson@intel.com; mb@smartsharesystems.com
>Cc: Jerin Jacob <jerinj@marvell.com>; thomas@monjalon.net; Vamsi Krishna
>Attunuru <vattunuru@marvell.com>
>Subject: [PATCH v0 1/1] doc: announce inter-device DMA capability support in
>dmadev
>
>From: Vamsi Attunuru <vattunuru@marvell.com>
>
>Modern DMA hardware supports data transfer between multiple DMA
>devices, enabling data communication across isolated domains or containers.
>To facilitate this, the ``dmadev`` library requires changes to allow devices to
>register with or unregisters from DMA groups for inter-device communication.
>This feature is planned for inclusion in DPDK 25.11.
>
>Signed-off-by: Vamsi Attunuru <vattunuru@marvell.com>
>---
> doc/guides/rel_notes/deprecation.rst | 7 +++++++
> 1 file changed, 7 insertions(+)
>
>diff --git a/doc/guides/rel_notes/deprecation.rst
>b/doc/guides/rel_notes/deprecation.rst
>index e2d4125308..46836244dd 100644
>--- a/doc/guides/rel_notes/deprecation.rst
>+++ b/doc/guides/rel_notes/deprecation.rst
>@@ -152,3 +152,10 @@ Deprecation Notices
> * bus/vmbus: Starting DPDK 25.11, all the vmbus API defined in
>   ``drivers/bus/vmbus/rte_bus_vmbus.h`` will become internal to DPDK.
>   Those API functions are used internally by DPDK core and netvsc PMD.
>+
>+* dmadev: a new capability flag ``RTE_DMA_CAPA_INTER_DEV`` will be
>+added
>+  to advertise DMA device's inter-device DMA copy capability. To enable
>+  this functionality, a few dmadev APIs will be added to configure the
>+DMA
>+  access groups, facilitating coordinated data communication between
>devices.
>+  A new ``dev_idx`` field will be added to the ``struct
>+rte_dma_vchan_conf``
>+  structure to configure a vchan for data transfers between any two DMA
>devices.
>--
>2.34.1

RE: [PATCH v0 1/1] doc: announce inter-device DMA capability support in dmadev

[Vamsi Krishna Attunuru]

Hi Feng,

Kindly review below.

Regards
Vamsi

>-----Original Message-----
>From: Vamsi Krishna Attunuru <vattunuru@marvell.com>
>Sent: Friday, July 11, 2025 8:35 PM
>To: Vamsi Krishna Attunuru <vattunuru@marvell.com>; dev@dpdk.org;
>fengchengwen@huawei.com; Pavan Nikhilesh Bhagavatula
><pbhagavatula@marvell.com>; kevin.laatz@intel.com;
>bruce.richardson@intel.com; mb@smartsharesystems.com
>Cc: Jerin Jacob <jerinj@marvell.com>; thomas@monjalon.net
>Subject: RE: [PATCH v0 1/1] doc: announce inter-device DMA capability
>support in dmadev
>
>Hi,
>
>Gentle ping for reviews.
>
>>-----Original Message-----
>>From: Vamsi Krishna <vattunuru@marvell.com>
>>Sent: Thursday, July 10, 2025 2:21 PM
>>To: dev@dpdk.org; fengchengwen@huawei.com; Pavan Nikhilesh
>Bhagavatula
>><pbhagavatula@marvell.com>; kevin.laatz@intel.com;
>>bruce.richardson@intel.com; mb@smartsharesystems.com
>>Cc: Jerin Jacob <jerinj@marvell.com>; thomas@monjalon.net; Vamsi
>>Krishna Attunuru <vattunuru@marvell.com>
>>Subject: [PATCH v0 1/1] doc: announce inter-device DMA capability
>>support in dmadev
>>
>>From: Vamsi Attunuru <vattunuru@marvell.com>
>>
>>Modern DMA hardware supports data transfer between multiple DMA
>>devices, enabling data communication across isolated domains or containers.
>>To facilitate this, the ``dmadev`` library requires changes to allow
>>devices to register with or unregisters from DMA groups for inter-device
>communication.
>>This feature is planned for inclusion in DPDK 25.11.
>>
>>Signed-off-by: Vamsi Attunuru <vattunuru@marvell.com>
>>---
>> doc/guides/rel_notes/deprecation.rst | 7 +++++++
>> 1 file changed, 7 insertions(+)
>>
>>diff --git a/doc/guides/rel_notes/deprecation.rst
>>b/doc/guides/rel_notes/deprecation.rst
>>index e2d4125308..46836244dd 100644
>>--- a/doc/guides/rel_notes/deprecation.rst
>>+++ b/doc/guides/rel_notes/deprecation.rst
>>@@ -152,3 +152,10 @@ Deprecation Notices
>> * bus/vmbus: Starting DPDK 25.11, all the vmbus API defined in
>>   ``drivers/bus/vmbus/rte_bus_vmbus.h`` will become internal to DPDK.
>>   Those API functions are used internally by DPDK core and netvsc PMD.
>>+
>>+* dmadev: a new capability flag ``RTE_DMA_CAPA_INTER_DEV`` will be
>>+added
>>+  to advertise DMA device's inter-device DMA copy capability. To
>>+enable
>>+  this functionality, a few dmadev APIs will be added to configure the
>>+DMA
>>+  access groups, facilitating coordinated data communication between
>>devices.
>>+  A new ``dev_idx`` field will be added to the ``struct
>>+rte_dma_vchan_conf``
>>+  structure to configure a vchan for data transfers between any two
>>+DMA
>>devices.
>>--
>>2.34.1

RE: [EXTERNAL] [PATCH v0 1/1] doc: announce inter-device DMA capability support in dmadev

[Anoob Joseph]

> From: Vamsi Attunuru <mailto:vattunuru@marvell.com>
> 
> Modern DMA hardware supports data transfer between multiple
> DMA devices, enabling data communication across isolated domains or
> containers. To facilitate this, the ``dmadev`` library requires changes
> to allow devices to register with or unregisters from DMA groups for
> inter-device communication. This feature is planned for inclusion
> in DPDK 25.11.
> 
> Signed-off-by: Vamsi Attunuru <vattunuru@marvell.com>

Acked-by: Anoob Joseph <anoobj@marvell.com>

Re: [EXTERNAL] [PATCH v0 1/1] doc: announce inter-device DMA capability support in dmadev

[Pavan Nikhilesh Bhagavatula]

>> From: Vamsi Attunuru <mailto:vattunuru@marvell.com>
>>
>> Modern DMA hardware supports data transfer between multiple
>> DMA devices, enabling data communication across isolated domains or
>> containers. To facilitate this, the ``dmadev`` library requires changes
>> to allow devices to register with or unregisters from DMA groups for
>> inter-device communication. This feature is planned for inclusion
>> in DPDK 25.11.
>>
>> Signed-off-by: Vamsi Attunuru <vattunuru@marvell.com>
>
>Acked-by: Anoob Joseph <anoobj@marvell.com>

Acked-by: Pavan Nikhilesh <pbhagavatula@marvell.com>

>
>
>

Re: [PATCH v0 1/1] doc: announce inter-device DMA capability support in dmadev

[Medvedkin, Vladimir]

Hi Vamsi,

Could you please tell us more about usecases for this feature?

Thanks!

On 7/10/2025 9:51 AM, Vamsi Krishna wrote:
> From: Vamsi Attunuru <vattunuru@marvell.com>
>
> Modern DMA hardware supports data transfer between multiple
> DMA devices, enabling data communication across isolated domains or
> containers. To facilitate this, the ``dmadev`` library requires changes
> to allow devices to register with or unregisters from DMA groups for
> inter-device communication. This feature is planned for inclusion
> in DPDK 25.11.
>
> Signed-off-by: Vamsi Attunuru <vattunuru@marvell.com>
> ---
>   doc/guides/rel_notes/deprecation.rst | 7 +++++++
>   1 file changed, 7 insertions(+)
>
> diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
> index e2d4125308..46836244dd 100644
> --- a/doc/guides/rel_notes/deprecation.rst
> +++ b/doc/guides/rel_notes/deprecation.rst
> @@ -152,3 +152,10 @@ Deprecation Notices
>   * bus/vmbus: Starting DPDK 25.11, all the vmbus API defined in
>     ``drivers/bus/vmbus/rte_bus_vmbus.h`` will become internal to DPDK.
>     Those API functions are used internally by DPDK core and netvsc PMD.
> +
> +* dmadev: a new capability flag ``RTE_DMA_CAPA_INTER_DEV`` will be added
> +  to advertise DMA device's inter-device DMA copy capability. To enable
> +  this functionality, a few dmadev APIs will be added to configure the DMA
> +  access groups, facilitating coordinated data communication between devices.
> +  A new ``dev_idx`` field will be added to the ``struct rte_dma_vchan_conf``
> +  structure to configure a vchan for data transfers between any two DMA devices.

-- 
Regards,
Vladimir

RE: [EXTERNAL] Re: [PATCH v0 1/1] doc: announce inter-device DMA capability support in dmadev

[Vamsi Krishna Attunuru]

[-- Attachment #1: Type: text/plain, Size: 3146 bytes --]

Hi Vladimir,

Currently, mem-to-mem dma transfers happen within a single process address space. This feature aims to extend support for transfers across multiple process address spaces to meet the requirements of inter-process or inter-VM networking. In environments where share memory is not feasible due to security concerns, this feature allows controlled software to use DMA for packet transfers as needed.

Regards.

From: Medvedkin, Vladimir <vladimir.medvedkin@intel.com>
Sent: Monday, July 14, 2025 3:47 PM
To: dev@dpdk.org
Cc: Bruce Richardson <bruce.richardson@intel.com>
Subject: [EXTERNAL] Re: [PATCH v0 1/1] doc: announce inter-device DMA capability support in dmadev

Hi Vamsi, Could you please tell us more about usecases for this feature? Thanks! On 7/10/2025 9: 51 AM, Vamsi Krishna wrote: > From: Vamsi Attunuru <vattunuru@ marvell. com> > > Modern DMA hardware supports data transfer between
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Hi Vamsi,



Could you please tell us more about usecases for this feature?



Thanks!



On 7/10/2025 9:51 AM, Vamsi Krishna wrote:

> From: Vamsi Attunuru <vattunuru@marvell.com<mailto:vattunuru@marvell.com>>

>

> Modern DMA hardware supports data transfer between multiple

> DMA devices, enabling data communication across isolated domains or

> containers. To facilitate this, the ``dmadev`` library requires changes

> to allow devices to register with or unregisters from DMA groups for

> inter-device communication. This feature is planned for inclusion

> in DPDK 25.11.

>

> Signed-off-by: Vamsi Attunuru <vattunuru@marvell.com<mailto:vattunuru@marvell.com>>

> ---

>   doc/guides/rel_notes/deprecation.rst | 7 +++++++

>   1 file changed, 7 insertions(+)

>

> diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst

> index e2d4125308..46836244dd 100644

> --- a/doc/guides/rel_notes/deprecation.rst

> +++ b/doc/guides/rel_notes/deprecation.rst

> @@ -152,3 +152,10 @@ Deprecation Notices

>   * bus/vmbus: Starting DPDK 25.11, all the vmbus API defined in

>     ``drivers/bus/vmbus/rte_bus_vmbus.h`` will become internal to DPDK.

>     Those API functions are used internally by DPDK core and netvsc PMD.

> +

> +* dmadev: a new capability flag ``RTE_DMA_CAPA_INTER_DEV`` will be added

> +  to advertise DMA device's inter-device DMA copy capability. To enable

> +  this functionality, a few dmadev APIs will be added to configure the DMA

> +  access groups, facilitating coordinated data communication between devices.

> +  A new ``dev_idx`` field will be added to the ``struct rte_dma_vchan_conf``

> +  structure to configure a vchan for data transfers between any two DMA devices.



--

Regards,

Vladimir



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