<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"> <p style="font-family:Calibri;font-size:10pt;color:#008000;margin:5pt;font-style:normal;font-weight:normal;text-decoration:none;" align="Left"> [Public]<br> </p> <br> <div> <div class="WordSection1"> <div style="border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt"> <div> <div> <div> <div> <div> <div> <p class="MsoNormal">HI,<o:p></o:p></p> <p class="MsoNormal"><o:p> </o:p></p> <p class="MsoNormal">Snipped<o:p></o:p></p> <p class="MsoNormal"><o:p> </o:p></p> <p class="MsoNormal">Hi, <o:p></o:p></p> </div> <div> <p class="MsoNormal">You can create a simple setup with only running testpmd with primary and another testpmd with secondary and then see the results. <o:p></o:p></p> </div> <div> <p class="MsoNormal"><o:p> </o:p></p> </div> <p class="MsoNormal" style="margin-bottom:12.0pt">No, the reason for the primary process termination could be close or shutdown (ctrl + c or ctrl + q) or any other.<o:p></o:p></p> </div> <p class="MsoNormal" style="margin-bottom:12.0pt">The reason is clear: "In secondary processes, accessing 'dev->data->dev_private' or &dev->data->mac_addrs directly can<br> cause a segmentation fault if the primary process has exited or the<br> shared memory is unavailable." <o:p></o:p></p> </div> <div> <p class="MsoNormal">The effect is throughput the life-cycle of secondary process existence in dpdk after primary, <o:p></o:p></p> </div> <div> <p class="MsoNormal">You can check <br> <a href="https://patches.dpdk.org/project/dpdk/patch/20250721073851.963141-1-14pwcse1224@uetpeshawar.edu.pk/">https://patches.dpdk.org/project/dpdk/patch/20250721073851.963141-1-14pwcse1224@uetpeshawar.edu.pk/</a><br> <a href="https://patches.dpdk.org/project/dpdk/patch/20250721105522.1019515-1-14pwcse1224@uetpeshawar.edu.pk/">https://patches.dpdk.org/project/dpdk/patch/20250721105522.1019515-1-14pwcse1224@uetpeshawar.edu.pk/</a><o:p></o:p></p> </div> <div> <p class="MsoNormal"><o:p> </o:p></p> </div> <div> <p class="MsoNormal">I think most of the details have already been provided. <o:p></o:p></p> </div> <div> <p class="MsoNormal" style="margin-bottom:12.0pt">The community agrees with the current solution. <o:p></o:p></p> </div> <div> <p class="MsoNormal">Thanks. <o:p></o:p></p> </div> <div> <p class="MsoNormal"><o:p> </o:p></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif">There are couple of corrections that needs to shared to the current understanding you are sharing<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p> <ol style="margin-top:0in" start="1" type="1"> <li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo1"><span style="font-size:11.0pt;font-family:"Arial",sans-serif">Please find DPDK Documentation on mutli process as <a href="https://doc.dpdk.org/guides/prog_guide/multi_proc_support.html">4. Multi-process Support — Data Plane Development Kit 25.07.0 documentation</a><o:p></o:p></span></li></ol> <p class="MsoListParagraph" style="margin-left:41.25pt;text-indent:-.25in;mso-list:l1 level1 lfo1"> <![if !supportLists]><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman""> </span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Arial",sans-serif">From your `</span><span style="font-size:10.0pt;font-family:Consolas;color:#333333"> </span><span style="font-size:11.0pt;font-family:"Arial",sans-serif">This patch only adds stability and robustness to primary-secondary applications.` this is not true<o:p></o:p></span></p> <p class="MsoListParagraph" style="margin-left:41.25pt;text-indent:-.25in;mso-list:l1 level1 lfo1"> <![if !supportLists]><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman""> </span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Arial",sans-serif">`</span><span style="font-size:10.0pt;font-family:Consolas;color:#333333"> </span><span style="font-size:11.0pt;font-family:"Arial",sans-serif">any other application which provides primary-secondary support could also follow the same model` - actually by default the eal args supports mutli process. Only by specifying `--single-process` this is disabled<o:p></o:p></span></p> <p class="MsoListParagraph" style="margin-left:41.25pt;text-indent:-.25in;mso-list:l1 level1 lfo1"> <![if !supportLists]><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><span style="mso-list:Ignore">4.<span style="font:7.0pt "Times New Roman""> </span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Arial",sans-serif">`</span><span style="font-size:10.0pt;font-family:Consolas;color:#333333"> </span><span style="font-size:11.0pt;font-family:"Arial",sans-serif">the reason for the primary process termination could be close or shutdown (ctrl + c or ctrl + q)` DPDK testpmd and a few examples like L2fwd, eventdev, l3fwd and other uses SIGACTION to check gracefully exit<o:p></o:p></span></p> <ol style="margin-top:0in" start="5" type="1"> <li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo1"><span style="font-size:11.0pt;font-family:"Arial",sans-serif">In all graceful exit `rte_eal_cleanup is invoked`. Hence any secondary (as shared in my previous emails) will have dangling pointers.<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo1"><span style="font-size:11.0pt;font-family:"Arial",sans-serif">For customer till 2023 and internal testing (as mentioned in my email) any abrupt kill of primary does not corrupt the secondary rte_eth_dev_list.<o:p></o:p></span></li></ol> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif">From patch perspective<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><a href="https://patches.dpdk.org/project/dpdk/patch/20250721073851.963141-1-14pwcse1224@uetpeshawar.edu.pk/">https://patches.dpdk.org/project/dpdk/patch/20250721073851.963141-1-14pwcse1224@uetpeshawar.edu.pk/</a><o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif">what Stephen shared is correct, PMD are not incharge of process aliveness. It is correct hence NAK<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><a href="https://patches.dpdk.org/project/dpdk/patch/20250721105522.1019515-1-14pwcse1224@uetpeshawar.edu.pk/">net/ice: fix segfault in secondary process by validating dev_private pointer - Patchwork</a><o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif">trying to do in ICE driver should be NAK<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif">From solution perspective, in my earlier email I clearly asked why have not explored multi-process communication thread. Link to it is same as above under section `</span><b><span style="font-size:18.0pt;font-family:"Roboto Slab";color:#404040"> </span></b><b><span style="font-size:11.0pt;font-family:"Arial",sans-serif">4.4. Communication between multiple processes</span></b><span style="font-size:11.0pt;font-family:"Arial",sans-serif">`<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif">You could always design when `</span><span style="font-size:10.0pt;font-family:Consolas;color:#333333"> </span><span style="font-size:11.0pt;font-family:"Arial",sans-serif">(ctrl + c or ctrl + q)` primary can send a broadcast to all secondaries to stop eth, event, bbdev or any such execution or simply exit.<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif">This is what we designed and shared as working logic.<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p> <p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt;font-family:"Arial",sans-serif">Note: You have also mentioned `</span> The community agrees with the current solution. ` which paints a picture of<o:p></o:p></p> <ol style="margin-top:0in" start="1" type="1"> <li class="MsoListParagraph" style="margin-bottom:12.0pt;margin-left:0in;mso-list:l0 level1 lfo2"> Only there is one way to solve this problem.<o:p></o:p></li><li class="MsoListParagraph" style="margin-bottom:12.0pt;margin-left:0in;mso-list:l0 level1 lfo2"> Since I did not agree to your thought process I am not community.<o:p></o:p></li></ol> <p class="MsoNormal" style="margin-bottom:12.0pt">Personally, I am not happy with such biases, DPDK had been supporting and nurturing open healthy conversation and platform. I am not aware this was changed.<o:p></o:p></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p> </div> </div> </div> </div> </div> </div> </div> </body> </html>