From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ej1-f74.google.com (mail-ej1-f74.google.com [209.85.218.74]) (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 4CFD735AC12 for ; Tue, 26 May 2026 12:13:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.74 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779797583; cv=none; b=odNibvdmzoFk9n0GL0HRXuo12OcM8F3ZF1kpeGnF2UaGtdqVYphHGFMicB5tdX3vz3jrKOqQUxfLoejQbPw0o59bsTEfUaW4InNJtOztMUE3RYOF0Cmn019716mlisYEx41oqdiRavlAeoZOBLtInMpC3m8o3G1wqC6TiKjH5TA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779797583; c=relaxed/simple; bh=pOAcjYzz/U4h24Eskb6+XHs/xOejt1MVBD2qiXMKAPY=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=tiiNxPhoCob2e3EXOwGgdwdBHL4e6Pk0sjIV6x9gTuT6d7jbHiYBmWpTk7ijw4AqXx8KvaWZ/9ApLDmB5QDMd2I3XmMf6y2UHhHkwRu0O+HjUYY3H8WLE8nh/NILLNMtAY9OJvFm6KWLpQYggChXghUxpz8lPq2mRqQlg0GnGiA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--sidnayyar.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=bhsfDNM5; arc=none smtp.client-ip=209.85.218.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--sidnayyar.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="bhsfDNM5" Received: by mail-ej1-f74.google.com with SMTP id a640c23a62f3a-bdbb76c4f25so582948966b.0 for ; Tue, 26 May 2026 05:13:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1779797581; x=1780402381; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=UIl3E/KIplY8UrahHH32aBs14FSe0oCJM9lCiFtGNHw=; b=bhsfDNM5eJVD0bFeyw4VItLmrtRI1/uBtxR2MEiqJ1VFMM7BA70E3x9lN8S8OAPhsX tMvSG+zsdMH/IC1lNSFin5Asa6dfiCOd0RPqE+KU1lq9QDJBhn5OnBfrDQJ6AxmflgLV 12YPRAM+2/WrRVzkOrPw/qua1WT8AyhjHV0oJldKOLbM36I5dUy2AMtR7s/KYxrV0krm oBk6h+qTWNyqJWBXdsl7JXM2KHy2dsPXO6/I5xNWbNhwKpjbKnDkIYnCeOlgD+iYzObu 8pnxmdK5HT/QxfHyBS7AYRjIitjBXPI4nm7YxJRHVYncSfoP0ef7x5crUZbTh0DPFOcp gDjg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779797581; x=1780402381; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=UIl3E/KIplY8UrahHH32aBs14FSe0oCJM9lCiFtGNHw=; b=d8DY8PIqsYO/wvx/MdWUwyOzqFwYFAXP0CSxpo6SPGCQ/eSFwKLHnz2ncBnAenhUI1 cffQrozNGvGcxwVekqfwUh2/lZUo4qWbrFrZhekC0pEqCap28NQIu4QEChOPQuo01xoj yZG76T7T2ALq4qCr9eTiilcz2dpO6l1kYFTIstgpxrpugGXzjH4nguj/ai/ftzxpwewm 6KXo2eXbUht1kZqD8BYS7cw3N07OCkWF5E77ZpQzkOQqeTbW/3CsfiL5EhYj2qUKlUdz w+1poS233OT0la8l2Lr7t6dVZpBV3cX0PARx24nnWboDgGuPyP3uWGWXJKT6cD7gfG6L Z/SA== X-Forwarded-Encrypted: i=1; AFNElJ9rylOizHYUNHQSp2NsN4mOBEApAZdT/Bt8Fs8Uzrop+2qNTfTL41YKZOOrfzi3pEWHGkSQXk5ytn7Poto=@vger.kernel.org X-Gm-Message-State: AOJu0YzSmpvWKgwPq2PscpQCvxz6qHfkJIVToU3qQvvWYdKEecJB8GQ/ 2xRohUUe9lCsA+pVcXsdIZN8ITls4TKVeN9v30wBqPSUifkQ6VlnMqCEdb7rrvbzvbDVc33o1rR jWVBNpHt8V65QzICA2Q== X-Received: from ejdbw10.prod.google.com ([2002:a17:907:fd8a:b0:bb8:69be:b9f0]) (user=sidnayyar job=prod-delivery.src-stubby-dispatcher) by 2002:a17:907:c003:b0:bd5:7a3:a593 with SMTP id a640c23a62f3a-bdd2b0d6a45mr1184970266b.46.1779797580315; Tue, 26 May 2026 05:13:00 -0700 (PDT) Date: Tue, 26 May 2026 12:12:55 +0000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAEeOFWoC/5XNQQ6CMBCF4auQrh1Da6HqynsYYgqdlkmgJQUbD OHuAokHcPm/xfsWNmIkHNk9W1jERCMFv4U4ZaxptXcIZLZmIhdlXggBHdX1YKEL2kDqO/LvGer JAnlw6F/7jhH6YBCkVPJ6kVrLUrHtcIhoaT6wZ7V1S+MU4uewE9/XHyP/YRIHDqUtlOU3rpU2D xeC6/DchJ5V67p+AUlreI/lAAAA X-Change-Id: 20260522-libbpf-load-vmlinux-btf-in-gen_loader-mode-4474834aa467 X-Mailer: b4 0.14.3 Message-ID: <20260526-libbpf-load-vmlinux-btf-in-gen_loader-mode-v2-0-6750f5859bc6@google.com> Subject: [PATCH v2 0/3] libbpf: support STRUCT_OPS in light skeletons From: Siddharth Nayyar To: Andrii Nakryiko , Eduard Zingerman , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Kumar Kartikeya Dwivedi , Song Liu , Yonghong Song , Jiri Olsa Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, gprocida@google.com, maennich@google.com, Siddharth Nayyar Content-Type: text/plain; charset="utf-8" This series enables support for BPF `STRUCT_OPS` maps (such as `sched_ext_ops` used by sched_ext) when using light skeletons (i.e. `gen_loader` mode). Previously, generating light skeletons for objects containing `STRUCT_OPS` maps would fail or produce incomplete results because `gen_loader` lacked support for several key features required by `STRUCT_OPS` maps, specifically: 1. Loading `vmlinux` BTF to resolve kernel-side type information. 2. Correctly plumbing `btf_vmlinux_value_type_id` into map creation attributes. 3. Ensuring `btf_key_type_id` is zeroed out to satisfy kernel safety checks. 4. Plumbing the userspace BTF FD (`btf_fd`) when `btf_vmlinux_value_type_id` is present but `btf_value_type_id` is zero (which is always the case for `STRUCT_OPS` maps). This series addresses these limitations by: - Loading `vmlinux` BTF in `gen_loader` mode when the BPF object contains `struct_ops` maps. - Explicitly zeroing out `btf_key_type_id` for `STRUCT_OPS` maps to satisfy kernel validations. - Expanding the map creation attribute size in `gen_loader` to include `btf_vmlinux_value_type_id` and plumbing it. - Fixing `btf_fd` copying logic in `gen_loader` to populate it if either `btf_value_type_id` or `btf_vmlinux_value_type_id` is set. With these changes, it is now possible to generate and use light skeletons for BPF programs utilizing `STRUCT_OPS`, such as custom sched_ext schedulers. Signed-off-by: Siddharth Nayyar --- Changes in v2: - Expand the series to 3 patches to fully support STRUCT_OPS in gen_loader. - Add a patch to explicitly zero out btf_key_type_id for STRUCT_OPS maps. - Add a patch to plumb btf_vmlinux_value_type_id and btf_fd in gen_loader. - Link to v1: https://lore.kernel.org/r/20260524-libbpf-load-vmlinux-btf-in-gen_loader-mode-v1-1-6f57f191a7ad@google.com --- Siddharth Nayyar (3): libbpf: load vmlinux BTF in gen_loader mode for struct_ops libbpf: zero out btf_key_type_id for STRUCT_OPS maps libbpf: plumb btf_vmlinux_value_type_id and btf_fd in gen_loader tools/lib/bpf/gen_loader.c | 5 +++-- tools/lib/bpf/libbpf.c | 6 +++++- 2 files changed, 8 insertions(+), 3 deletions(-) --- base-commit: c6e99c10fd9855082568cbd71bb2cc5dc90eda53 change-id: 20260522-libbpf-load-vmlinux-btf-in-gen_loader-mode-4474834aa467 Best regards, -- Siddharth Nayyar