[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