From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ed1-f41.google.com (mail-ed1-f41.google.com [209.85.208.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EA29833439D for ; Wed, 15 Oct 2025 17:29:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.41 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760549348; cv=none; b=Xxg+bgsvNoFkm2LmZEQgjxyFlQB8lbq3Sc6SO4GNXS/GOUdXoKqe2lBw7e8krbJxtyLg0MbaRkRcThXF55qwmeBdBPxXI+i6EaGueWfv9iEbDC4+H/ptS25vjyxTb9TiqjmWMvAIKtnOjs0QKVnxXpwvnQqm5odnZelk9HronzE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760549348; c=relaxed/simple; bh=Jv6+NCZ+nS1cBr+AvMbuIEZ/SzyIe/dExl75fldglWg=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=jlqoqcgJS/La8HTt8PjwdxfbYLDMjkA9RsA2j8YxXL0XTy9Gz3vHFv94MIc8amWOV+C2clYvzv4Y7gOa8iFSOJupB6fxleMaDpvuaX60lEesVONn4XUz0ZhURnJ11mbaOVk2g6WfoNza9DAbvgG6plFrSRGNXKsUKyFUxAd84rY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=ei4gRLdn; arc=none smtp.client-ip=209.85.208.41 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ei4gRLdn" Received: by mail-ed1-f41.google.com with SMTP id 4fb4d7f45d1cf-636de696e18so5054931a12.3 for ; Wed, 15 Oct 2025 10:29:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1760549341; x=1761154141; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=PFr/R+iQvZCbHsrqL2J/+vRylbNodNHeHelx7cyYBEU=; b=ei4gRLdnnEtNpgOTPVH02g8w2+PHCIKI8NNPDksrtfqpbknawRiL1jOVYq4gvebTh9 9nSAIoGgjdUAHgrDHKOTyTGyB7dVci1Rs6+VqIusk8cNy0A6J8UlXAqScaIvThKNVXcn Ti2lBzzqCRb4W5JzBvI8N2Cq7QpyqCsxISKHiQdGpB8Vou8egsCmW5W9jVXOrmUXRPcH ilBJcs7vrdM3WOyec/ujWJnqYME23pVuuZGwsT7hW02huEoVMFJpBbnoYTIH807Ov2rO x+keZlMzCZr1ppslvi4XRW5F124ar+n32UqXTqoNFL1ILeHRiLJJDHIhgQIVlxw3rwxX F5Gg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1760549341; x=1761154141; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=PFr/R+iQvZCbHsrqL2J/+vRylbNodNHeHelx7cyYBEU=; b=dumSFopqg7D387nhEjWpLBGfkEa2ihP4rHRyiBoN88ajaIZqs64EdhdvvJWalYXlgL yB9JRGE/+ec19C9MSUarzfmHWSHF1Na3VKMwHXZ1iIYPyd0LVCLYSYObUV97Dxxddmzl P2E89M9EnR6tXa8DSZGOdMoLaLLe5/FofGjXeV2twuYPoCf1Dx5w/9te+ii2qn0NiaVB QikoTudlImcSY0Zv+pD6OuDE46Hz8Ui8nPf58c5rm5kTpLjrzhdnCAkR1jhxKvaIyP7F bKkf9ihUnBBew4k/ENXM/4Cnqa1GmA8UgLF/k6gPRbfmQAEQI6TfhrlIKJ8IZI8ZSlfO HG6Q== X-Gm-Message-State: AOJu0YyXiRnV/x9OKzHPHzvnjNokA9Zx+Kaq1nD/0vTu1obXbMi0M3FR HgiKRmtWI7oALCabX5COc4z9spwTFd5TK1+9r0FpgQTiLn7YB6U6DC+l X-Gm-Gg: ASbGncuyVIBBNnZ/XsTJTKAAkaj63tkf8gErO7tz1HjwOslaRAssouQnIN4/aK5TJQr OGOLadss9WUHlM9B+d7s23ONxXNecSJuSl91uymXfrPXrf8YR3EsZ2uv9uudmiLBqiSu91y4iGJ FSB9KI0xL2RBkYaixh+CwyjAoAFLFraYICC6GBiON21M9CXYN8zqPrAAzX/5XqvH012yERijgZt udxewJtAFlj7ZNcFpapIIJh0PipHjnu84b6NSzabg6dCSJnCoDnXN4b65iISKfnoSw+1M4eHjyj rwTd9Macb6R7KhT5HpPd11eGxLPA8m0hVgS7JOPnaSf+Rl4Kck05Iq1XSgGU17jTjBSSCyNbeRJ OR8l2zHFCGOj+IJV1ba4S5Q9AKd2JsIqp2zRPEREFm47Gm6uFVMuIWhUC7AmCZQ== X-Google-Smtp-Source: AGHT+IEwHWpR5pS6MWV5DiElNaioQN4xdIoxQq17Fdi+Z71Xrr4Uskq48/WBodX4p3eOXRu99O6mfQ== X-Received: by 2002:a17:907:7e88:b0:b3f:9e3d:daa4 with SMTP id a640c23a62f3a-b50ac9f3424mr2888682466b.65.1760549340787; Wed, 15 Oct 2025 10:29:00 -0700 (PDT) Received: from mail.gmail.com ([2a04:ee41:4:b2de:1ac0:4dff:fe0f:3782]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b5cccdaa082sm267715766b.50.2025.10.15.10.28.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Oct 2025 10:29:00 -0700 (PDT) Date: Wed, 15 Oct 2025 17:35:34 +0000 From: Anton Protopopov To: Yonghong Song Cc: bpf@vger.kernel.org, Alexei Starovoitov , Andrii Nakryiko , Anton Protopopov , Daniel Borkmann , Eduard Zingerman , Quentin Monnet Subject: Re: [PATCH v5 bpf-next 13/15] libbpf: support llvm-generated indirect jumps Message-ID: References: <20250930125111.1269861-1-a.s.protopopov@gmail.com> <20250930125111.1269861-14-a.s.protopopov@gmail.com> <4a536cda-0ba5-437f-82ae-60468a75a62c@linux.dev> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4a536cda-0ba5-437f-82ae-60468a75a62c@linux.dev> On 25/10/15 08:32AM, Yonghong Song wrote: > > > On 9/30/25 5:51 AM, Anton Protopopov wrote: > > For v5 instruction set LLVM is allowed to generate indirect jumps for > > FYI. The llvm jump table support is still cpu v4. Yes, thanks! I've fixed the message. > > switch statements and for 'goto *rX' assembly. Every such a jump will > > be accompanied by necessary metadata, e.g. (`llvm-objdump -Sr ...`): > > > > 0: r2 = 0x0 ll > > 0000000000000030: R_BPF_64_64 BPF.JT.0.0 > > > > Here BPF.JT.1.0 is a symbol residing in the .jumptables section: > > > > Symbol table: > > 4: 0000000000000000 240 OBJECT GLOBAL DEFAULT 4 BPF.JT.0.0 > > > > The -bpf-min-jump-table-entries llvm option may be used to control the > > minimal size of a switch which will be converted to an indirect jumps. > > > > Signed-off-by: Anton Protopopov > > [...] >