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I鈥檝e recently been testing the BlueField-3 DPU鈥檚 Data-Path Accelerator (DPA) and learning more about its features. Specifically, I have been testing the DPA kernel鈥檚 ability to access host-allocated external memory using the window feature. I am roughly following the instructions provided in the latest documentation: DPA Development - NVIDIA Docs Regarding this, I believe I might鈥檝e found a small bug in the Flex IO SDK API. Following the above sample code for configuring a window, I found ..." /> <meta name="twitter:description" content="Hi! I鈥檝e recently been testing the BlueField-3 DPU鈥檚 Data-Path Accelerator (DPA) and learning more about its features. Specifically, I have been testing the DPA kernel鈥檚 ability to access host-allocated external memory using the window feature. I am roughly following the instructions provided in the latest documentation: DPA Development - NVIDIA Docs Regarding this, I believe I might鈥檝e found a small bug in the Flex IO SDK API. Following the above sample code for configuring a window, I found ..." /> <meta property="og:article:section" content="Infrastructure & Networking" /> <meta property="og:article:section:color" content="76B900" /> <meta property="og:article:section" content="DOCA" /> <meta property="og:article:section:color" content="76B900" /> <meta property="og:article:section" content="Other" /> <meta property="og:article:section:color" content="76B900" /> <meta property="article:published_time" content="2024-11-25T02:31:42+00:00" /> <meta property="og:ignore_canonical" content="true" /> <script type="application/ld+json">{"@context":"http://schema.org","@type":"QAPage","name":"Potential bug in Flex IO SDK","mainEntity":{"@type":"Question","name":"Potential bug in Flex IO SDK","text":"Hi! I鈥檝e recently been testing the BlueField-3 DPU鈥檚 Data-Path Accelerator (DPA) and learning more about its features. Specifically, I have been testing the DPA kernel鈥檚 ability to access host-allocated external memory using the window feature. I am roughly following the instructions provided in the…","upvoteCount":0,"answerCount":0,"datePublished":"2024-11-25T02:31:41.943Z","author":{"@type":"Person","name":"dariusgrassi","url":"https://forums.developer.nvidia.com/u/dariusgrassi"}}}</script> </head> <body class="crawler browser-update"> <header> <a href="/"> NVIDIA Developer Forums </a> </header> <div id="main-outlet" class="wrap" role="main"> <div id="topic-title"> <h1> <a href="/t/potential-bug-in-flex-io-sdk/314536">Potential bug in Flex IO SDK</a> </h1> <div class="topic-category" itemscope itemtype="http://schema.org/BreadcrumbList"> <span itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem"> <a href="/c/infrastructure/doca/other/378" class="badge-wrapper bullet" itemprop="item"> <span class='badge-category-bg' style='background-color: #76B900'></span> <span class='badge-category clear-badge'> <span class='category-name' itemprop='name'>Infrastructure & Networking</span> </span> </a> <meta itemprop="position" content="1" /> </span> <span itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem"> <a href="/c/infrastructure/doca/other/378" class="badge-wrapper bullet" itemprop="item"> <span class='badge-category-bg' style='background-color: #76B900'></span> <span class='badge-category clear-badge'> <span class='category-name' itemprop='name'>DOCA</span> </span> </a> <meta itemprop="position" content="2" /> </span> <span itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem"> <a href="/c/infrastructure/doca/other/378" class="badge-wrapper bullet" itemprop="item"> <span class='badge-category-bg' style='background-color: #76B900'></span> <span class='badge-category clear-badge'> <span class='category-name' itemprop='name'>Other</span> </span> </a> <meta itemprop="position" content="3" /> </span> </div> </div> <div itemscope itemtype='http://schema.org/DiscussionForumPosting'> <meta itemprop='headline' content='Potential bug in Flex IO SDK'> <link itemprop='url' href='https://forums.developer.nvidia.com/t/potential-bug-in-flex-io-sdk/314536'> <meta itemprop='datePublished' content='2024-11-25T02:31:41Z'> <meta itemprop='articleSection' content='Other'> <meta itemprop='keywords' content=''> <div itemprop='publisher' itemscope itemtype="http://schema.org/Organization"> <meta itemprop='name' content='NVIDIA'> <div itemprop='logo' itemscope itemtype="http://schema.org/ImageObject"> <meta itemprop='url' content='https://global.discourse-cdn.com/nvidia/original/3X/a/1/a1ef6e0c1fbd3fad5bf82538b78dfaa9c5fa1a61.png'> </div> </div> <div id='post_1' class='topic-body crawler-post'> <div class='crawler-post-meta'> <span class="creator" itemprop="author" itemscope itemtype="http://schema.org/Person"> <a itemprop="url" href='https://forums.developer.nvidia.com/u/dariusgrassi'><span itemprop='name'>dariusgrassi</span></a> </span> <link itemprop="mainEntityOfPage" href="https://forums.developer.nvidia.com/t/potential-bug-in-flex-io-sdk/314536"> <span class="crawler-post-infos"> <time datetime='2024-11-25T02:31:42Z' class='post-time'> November 25, 2024, 2:31am </time> <meta itemprop='dateModified' content='2024-11-25T02:31:42Z'> <span itemprop='position'>1</span> </span> </div> <div class='post' itemprop='text'> <p>Hi! I鈥檝e recently been testing the BlueField-3 DPU鈥檚 Data-Path Accelerator (DPA) and learning more about its features. Specifically, I have been testing the DPA kernel鈥檚 ability to access host-allocated external memory using the <code>window</code> feature. I am roughly following the instructions provided in the latest documentation: <a href="https://docs.nvidia.com/doca/sdk/dpa+development/index.html#src-3137262897_id-.DPADevelopmentv2.9.0LTS-FlexIOSDKMemoryManagement" class="inline-onebox" rel="noopener nofollow ugc">DPA Development - NVIDIA Docs</a></p> <p>Regarding this, I believe I might鈥檝e found a small bug in the Flex IO SDK API.</p> <p>Following the above sample code for configuring a window, I found my program was crashing at the call to <code>flexio_dev_window_ptr_acquire</code>. Using the DPA GDB, I learned that the crash inside this function was due to passing the <code>dev_ptr</code> parameter as NULL (initialized to 0x0). Stepping by instruction, I learned that <code>flexio_dev_window_ptr_acquire</code> was attempting to write into the NULL pointer鈥檚 memory address, which fortunately it seems like the DPA鈥檚 RTOS catches and segfaults out of.</p> <p>I resolved my issue by initializing dev_ptr to a separate int value before passing it to the function:</p> <pre><code class="lang-auto">uint64_t dev_ptr_value = 0; uint64_t *dev_ptr = &dev_ptr_value; </code></pre> <p>However, checking for NULL pointers is common practice, and unless I鈥檓 missing something I think it would be a useful check to have for this function as well.</p> <p>Best,<br> Darius</p> </div> <div itemprop="interactionStatistic" itemscope itemtype="http://schema.org/InteractionCounter"> <meta itemprop="interactionType" content="http://schema.org/LikeAction"/> <meta itemprop="userInteractionCount" content="0" /> <span class='post-likes'></span> </div> </div> </div> <div id="related-topics" class="more-topics__list " role="complementary" 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