From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 9F6EE48AA4; Sat, 8 Nov 2025 02:08:10 +0100 (CET) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 5F52B4026D; Sat, 8 Nov 2025 02:08:10 +0100 (CET) Received: from mail-pg1-f175.google.com (mail-pg1-f175.google.com [209.85.215.175]) by mails.dpdk.org (Postfix) with ESMTP id 1325F40261 for ; Sat, 8 Nov 2025 02:08:08 +0100 (CET) Received: by mail-pg1-f175.google.com with SMTP id 41be03b00d2f7-b62e7221351so1089376a12.1 for ; Fri, 07 Nov 2025 17:08:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=networkplumber-org.20230601.gappssmtp.com; s=20230601; t=1762564088; x=1763168888; darn=dpdk.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=O9ut2kTRQ709p5Y+L/hyuHYY+d6P/5TAqrR1Nk0cZSg=; b=WK3yDTICor2z84Le9DP5qEKK86RxNFRHJD966K4FDm3MyD1WRL3y0u9bwMVcUbZUSS He6QxoWdUQ6ZkcnVojfycejelwxlAmNDjy5nXiPnF7lZIAtCcAxMacvFmuvSoulZt34M hq7L/bNAUUQFabhM7iGp09sMqZ6E1wY+5by98AOn8IbHw61Su7p2qLmPBzYTu6lYbKYc 8EjJds+qTWc1m5NRPTSsOlARcvjHucTd5MBIqUn2x86aRhGydomJxYAjKl6SxONItR8Z dElYy4FHSB5GTxDstzWyzFTRBatQzdXmWxwKn4wxef5rrZQvGuCbDkxaKFM2LeU2fW81 64Ow== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762564088; x=1763168888; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=O9ut2kTRQ709p5Y+L/hyuHYY+d6P/5TAqrR1Nk0cZSg=; b=v1tX2MePx7JdKiAL4BjrXVD1AVjUlkuBJvI4+ATJbJ6dwgns7Rmhm5xZFfKao8tKo8 LOM15D06m1Prn0s29/BpvnM7RpUGSWYCC2eEHRjcatzAU6fhLBpq37DNlJcY+bTI839U eYzMxi8R+Vz/2mPDNm0ntJntAEvKB6RuLxiIumeK1C0sWn10y/z7b4gNU3gOgK4LKn+G FuEDC1L28Q0ipmH5qlQMjWPA2BAWbcZYt7mfIuC9zTrSqs3e+XBHxfifCVYKcf8HKaDm AZLoeYLigQ9NIpvfhFFiZwYOmbmD0+uCXzohpmxJb0nhnLF4KkiG+vMDZU9HMRIqAC9/ o4cg== X-Forwarded-Encrypted: i=1; AJvYcCU7MfeypVCIqPA/X5bj1C6XOVGoKwfiCoD4Rzq4/WdQM5IQWAdiGhBu4q/Y2ADxC58YrRw=@dpdk.org X-Gm-Message-State: AOJu0YyQKuHb20dxHSi0vq+OauZAGqzKAJMcIMrPouwG1D1yuFvq4FnR HGZt9kwb3FBwkROi7JUeLlfxtiqVlwi49TOQIKHZCW23Txq91LHB/jXTdtky+9K4/ek= X-Gm-Gg: ASbGncvLaruQssDfAsoCgXDHVq3ZAzNd5XdWBloNdIGAEQzHv5Jn//ulmRr50QQ0OEa yRGzahEz4vmPCd/PJCwC1pfNAB8ir+VovgZ7QuXRSCkVHrR0gMEeg3qx6cpssSU7uMWmL3kLjev Qurr+07udBIG8nR9TzXiO8R2HU2AmqSMM3MCCSS1l4jUed+SShX/CnyZD6bx/+RH0WAui6SH5jm itZuupGp4MnmsDBUPdCq93zFRRvvYou6WmVA1j4H6JAlAAA0Gj/9rPDu2fNiUnO+xI+1qyuUDGw lGGkJAJoQg2IpnH/PZCwP0f94kGunyG7Scylx7NfU+Bi7ImjUhQPmxGmgKsVUu5o0QDhYbjXW5L 5MhC6rDxz54W2D9gwrK+HDlC4IjSDCad97gZ9yr3+K6nDEUlKCT2zfufbFR5SdkowbgmxBY5wyJ r5hHTFlraUMMk66uxrSAEIjkyJ8DfY3vpTDg== X-Google-Smtp-Source: AGHT+IGTWpFQafwS6lDtm+7guOzJIsqfDcIgocxIvrtstleFS/mAupE4wShFYXQ/2WClW5dk7ZzrOg== X-Received: by 2002:a17:902:f70a:b0:295:8da5:c634 with SMTP id d9443c01a7336-297e5409d9cmr11515195ad.9.1762564087879; Fri, 07 Nov 2025 17:08:07 -0800 (PST) Received: from phoenix (204-195-96-226.wavecable.com. [204.195.96.226]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29650c5caf1sm71850385ad.34.2025.11.07.17.08.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 Nov 2025 17:08:07 -0800 (PST) Date: Fri, 7 Nov 2025 17:08:05 -0800 From: Stephen Hemminger To: Marat Khalili Cc: Konstantin Ananyev , "dev@dpdk.org" Subject: Re: [PATCH v4 3/5] bpf: add a test for BPF ELF load Message-ID: <20251107170805.12e51921@phoenix> In-Reply-To: <2951855794674cada3b9ab9574699917@huawei.com> References: <20251030173732.246435-1-stephen@networkplumber.org> <20251104160843.304044-1-stephen@networkplumber.org> <20251104160843.304044-4-stephen@networkplumber.org> <2951855794674cada3b9ab9574699917@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org On Fri, 7 Nov 2025 17:33:08 +0000 Marat Khalili wrote: > > +/* > > + * Test BPF function that will be loaded from ELF > > + * This function: > > + * 1. Reads values from input structure > > + * 2. Performs some computations > > + * 3. Writes results to output structure > > + * 4. Returns sum of values > > + */ > > +__attribute__((section("func"), used)) > > Do we need `used` here and in other section attributes? I do not thing `clang > -c` will eliminate non-static/inline functions from the object file, or maybe I > don't understand the purpose (perhaps needs a comment). > > > +uint64_t > > +test_func(struct dummy_vect8 *arg) The BPF loader in DPDK uses section names as the way to find functions. The original version of this code was autogenerated off of examples used in kernel BPF.