<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="Generator" content="Microsoft Word 15 (filtered medium)"> <style></style> </head> <body lang="EN-US" link="blue" vlink="purple" style="word-wrap:break-word"> <div class="WordSection1"> <p class="MsoNormal"><span style="font-size:11.0pt">Hi Vladimir,<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt">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.<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt">Regards.<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p> <div style="border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt"> <div> <div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in"> <p class="MsoNormal"><b><span style="font-size:11.0pt">From:</span></b><span style="font-size:11.0pt"> Medvedkin, Vladimir <vladimir.medvedkin@intel.com> <br> <b>Sent:</b> Monday, July 14, 2025 3:47 PM<br> <b>To:</b> dev@dpdk.org<br> <b>Cc:</b> Bruce Richardson <bruce.richardson@intel.com><br> <b>Subject:</b> [EXTERNAL] Re: [PATCH v0 1/1] doc: announce inter-device DMA capability support in dmadev<o:p></o:p></span></p> </div> </div> <p class="MsoNormal"><o:p> </o:p></p> <div> <p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">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<o:p></o:p></span></p> </div> <div> <p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">ZjQcmQRYFpfptBannerStart<o:p></o:p></span></p> </div> <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="100%" style="width:100.0%;border-radius:4px"> <tbody> <tr> <td style="padding:12.0pt 0in 12.0pt 0in"> <table class="MsoNormalTable" border="1" cellspacing="0" cellpadding="0" width="100%" style="width:100.0%;background:#D2D0D0;border:none;border-top:solid #8D8C8C 3.0pt"> <tbody> <tr> <td valign="top" style="border:none;padding:0in 7.5pt 3.75pt 4.5pt"> <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" align="left"> <tbody> <tr> <td style="padding:3.0pt 6.0pt 3.0pt 6.0pt"> <p class="MsoNormal"><b><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black">Prioritize security for external emails: <o:p></o:p></span></b></p> </td> </tr> <tr> <td style="padding:3.0pt 6.0pt 3.0pt 6.0pt"> <p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Confirm sender and content safety before clicking links or opening attachments <o:p></o:p></span></p> </td> </tr> </tbody> </table> <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" align="right"> <tbody> <tr> <td style="padding:3.0pt 0in 3.0pt 0in"> <p class="MsoNormal"> <a href="https://us-phishalarm-ewt.proofpoint.com/EWT/v1/CRVmXkqW!ti3Yn35UY3X61OwcGRf6bRAsmnzalHb1b3IuGKm4KAmFKsaahO5TQ00KAcbC6zX9rZkmmbglmeBA6oy8diWgp0Bz2fptvfWCiA$" target="_blank"><strong><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;border:solid #666666 1.0pt;padding:6.0pt;font-weight:normal;text-decoration:none"> Report Suspicious </span></strong></a> ‌ <span style="font-size:11.0pt"><o:p></o:p></span></p> </td> </tr> </tbody> </table> </td> </tr> </tbody> </table> </td> </tr> </tbody> </table> <div> <p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">ZjQcmQRYFpfptBannerEnd<o:p></o:p></span></p> </div> <div> <pre style="white-space:pre-wrap"><span style="font-size:11.0pt;font-family:"Arial",sans-serif">Hi Vamsi,<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">Could you please tell us more about usecases for this feature?<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">Thanks!<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">On 7/10/2025 9:51 AM, Vamsi Krishna wrote:<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> From: Vamsi Attunuru <<a href="mailto:vattunuru@marvell.com">vattunuru@marvell.com</a>><o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">><o:p> </o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> Modern DMA hardware supports data transfer between multiple<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> DMA devices, enabling data communication across isolated domains or<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> containers. To facilitate this, the ``dmadev`` library requires changes<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> to allow devices to register with or unregisters from DMA groups for<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> inter-device communication. This feature is planned for inclusion<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> in DPDK 25.11.<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">><o:p> </o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> Signed-off-by: Vamsi Attunuru <<a href="mailto:vattunuru@marvell.com">vattunuru@marvell.com</a>><o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> ---<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> doc/guides/rel_notes/deprecation.rst | 7 +++++++<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> 1 file changed, 7 insertions(+)<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">><o:p> </o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> index e2d4125308..46836244dd 100644<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> --- a/doc/guides/rel_notes/deprecation.rst<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> +++ b/doc/guides/rel_notes/deprecation.rst<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> @@ -152,3 +152,10 @@ Deprecation Notices<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> * bus/vmbus: Starting DPDK 25.11, all the vmbus API defined in<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> ``drivers/bus/vmbus/rte_bus_vmbus.h`` will become internal to DPDK.<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> Those API functions are used internally by DPDK core and netvsc PMD.<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> +<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> +* dmadev: a new capability flag ``RTE_DMA_CAPA_INTER_DEV`` will be added<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> + to advertise DMA device's inter-device DMA copy capability. To enable<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> + this functionality, a few dmadev APIs will be added to configure the DMA<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> + access groups, facilitating coordinated data communication between devices.<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> + A new ``dev_idx`` field will be added to the ``struct rte_dma_vchan_conf``<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">> + structure to configure a vchan for data transfers between any two DMA devices.<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">-- <o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">Regards,<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif">Vladimir<o:p></o:p></span></pre> <pre><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></pre> </div> </div> </div> </body> </html>