From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ej1-f45.google.com (mail-ej1-f45.google.com [209.85.218.45]) (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 60210332EA7 for ; Sun, 1 Mar 2026 17:59:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.45 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772387998; cv=none; b=k6/RPc5TIu9YG247PZ7Nsf0G0I4taiHDsLsQHTaNnfPc4IUrHKZsMGSyRCZi9Uxb8gI1tJ0lZB+WXMuIq1RWXMb6tlpKuDfKbGUCAVDL+7orHQIlyxEuhJAEHR/Zr0lIjOCrNV+aKNk5Y6QPVtfGTDIqeUehtZumvH5xL6/v9lw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772387998; c=relaxed/simple; bh=waHuXg1cR/lNxdO7JwWx5WCgUHMStoTszzOXqaMK+2A=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=Xoui8dG+I4TmTfxWh3ScUD8M1qLSLBtRv9a0Bzsz4C3lOmxLYmBQJIKsWHHa2lK5YeR5QfjLBIkxQXXboEF+lFtT3NmcGXJXM8XGp7XclJz7DwsFM4T4ieudXv6VRrSqfyqH72r8/MFrB4Wd2mdnNd/4lYAb6p1kdDd9RQrtLp8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=cloudflare.com; spf=pass smtp.mailfrom=cloudflare.com; dkim=pass (2048-bit key) header.d=cloudflare.com header.i=@cloudflare.com header.b=QGpbxEMw; arc=none smtp.client-ip=209.85.218.45 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=cloudflare.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=cloudflare.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=cloudflare.com header.i=@cloudflare.com header.b="QGpbxEMw" Received: by mail-ej1-f45.google.com with SMTP id a640c23a62f3a-b9358bc9c50so383007766b.1 for ; Sun, 01 Mar 2026 09:59:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloudflare.com; s=google09082023; t=1772387996; x=1772992796; darn=vger.kernel.org; h=mime-version:message-id:date:references:in-reply-to:subject:cc:to :from:from:to:cc:subject:date:message-id:reply-to; bh=bUriLEKIKpf7k3NxTjsJxgBlXx8URXMNCEQZ8pvmz+I=; b=QGpbxEMwqmSi8MXhx1v2I3f6cbO6LbepsKDKJTqf57NMkiqfF2TmtRdLpl6HMe20si jyEWuXHOYsXfui+AsgbyTLoUyePaYxiwfXS7IHbXdyu2opV2GKAn+air1H67kUKGn6uL HCruFoMuv2AccDJ4Ck35qJ/uRtyNTHpGdhOgD+dt2GQ3QKSn26poFFdY7BWs6ITqZ0Jj VhkVjUvVOhMtyAXu3TBQ/VmdYaZAD/Hgdx5uVaFFIMClcdBPPeQvvY+QZRB+Yd6vuRKB xyNPnXZGyXDWGpsWZ/VdA/45gpBPzkFJrn242l0UAb0qtJltWrA16YMyhlUvVgm3SYWl RxUQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772387996; x=1772992796; h=mime-version:message-id:date:references:in-reply-to:subject:cc:to :from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=bUriLEKIKpf7k3NxTjsJxgBlXx8URXMNCEQZ8pvmz+I=; b=mrPlEE6LQuDnO77b9NBQ/La07dMGqB6HgDEukLWDjvVD998PJOCouldyA9pZ266dOS fxvU5LlcxfaW7hU6qI674qZn84xo6TwTqRK2jcIpVyIMtl2wDNnRm2388R97Lb6knhW4 Hu3TqHRY9bbvLLsGOexKZY9lIdO5sFrmqevU0MEncjCAON6AvIoxyb2G66UlHW0eogPz 9rj9Hz5N66q5m6Bz1q7wM0G0n4GFMGLhPQfxJaUpy691HuzffU/cWeXkbhZ1AaUxh5EL vdSvCouFjpfe/8rR8oTn+N8tLgTaSLMWdLDgjZESjrNKNaIARLNl5wWM7ILBPgRA/ckp tsRw== X-Forwarded-Encrypted: i=1; AJvYcCXRt+2MOCQvPjGsxsFhfg54obFe9+x+5eLUGdX1TIIYsF37lpuKZ75FHk3u5weWXNBCfUQ=@vger.kernel.org X-Gm-Message-State: AOJu0YyQk+7Yey/liHOFKcWApNw2g1LGeqjA9Fb0VQdZXVe7PGUnmBY0 +hkEHgA7ny262FQSj8iIvD4F4RN6/zkjfyFXLMpoh/Wcm9LhQtx+A7ozYQ4/5Xirb7Q= X-Gm-Gg: ATEYQzxP0RdpHns4fpg8+65v03mS1g8MOyzCENp1qOPIX3MzNlCMbLWRdjbzfyAvfg/ pTwgrs0DSNWljzlTCLGAojSUcVGOah+aLHXTzFvWTUyM3Su5Fcqcmr+TpZdZ+MxZVZVoRG4duyz AefPhSvMhjqjYCFpi0rQOCuGQCK/i8NwdYWLHkPHCoRZjW1NIdnMsZfSHz0Bm1XEYxzXvqNnzEX 9G55mgC4FC2PXdIMEatAG6EhZYuam0rm8TMUC5WdCD03e/2ZfElCEm5bQSanwodBZ+cv11Hc38W F8duksBUiKbQVh0HMrxEofnvBKsX04jLPdu8K6d6W9baYW2e7UGR9ebwUUIskHgHnncoWKki67B Cvbwwu/q1oC2JgPkSShgDHWedPyfAJau2wNdiXhVtn+FV/FwIr99/Ihh0ZUV5LoN45WYjxAtMDl /ohvtYguMiJu9yuOswG+1ymRRUv/Y= X-Received: by 2002:a17:906:6cf:b0:b8e:796a:fd5d with SMTP id a640c23a62f3a-b93765110ecmr474922066b.39.1772387995610; Sun, 01 Mar 2026 09:59:55 -0800 (PST) Received: from cloudflare.com ([104.28.193.182]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b935aec3ea3sm381222466b.57.2026.03.01.09.59.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 01 Mar 2026 09:59:55 -0800 (PST) From: Jakub Sitnicki To: Jakub Kicinski Cc: Paolo Abeni , Alexei Starovoitov , bpf , Martin KaFai Lau , Network Development , kernel-team Subject: Re: [PATCH RFC bpf-next 0/5] skb extension for BPF local storage In-Reply-To: <20260228155021.1dc9b127@kernel.org> (Jakub Kicinski's message of "Sat, 28 Feb 2026 15:50:21 -0800") References: <20260226-skb-local-storage-v1-0-4ca44f0dd9d1@cloudflare.com> <87wlzydk12.fsf@cloudflare.com> <20260228155021.1dc9b127@kernel.org> Date: Sun, 01 Mar 2026 18:59:54 +0100 Message-ID: <87seaje8h1.fsf@cloudflare.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On Sat, Feb 28, 2026 at 03:50 PM -08, Jakub Kicinski wrote: > On Fri, 27 Feb 2026 21:11:05 +0100 Jakub Sitnicki wrote: >> So to exhaust all alternatives I gotta ask - would you and Jakub be open >> to the idea of a plain byte buffer embedded in skb_ext and exposed as a >> bpf_dynptr? > > I'm fine with that, but admittedly I (like you?) live in > the comfortable universe of controlling which .config options > are suitable for the narrow use cases I care about. > So I don't really trust my judgment. Adding Paolo.. Good point. Distro's would have to pick one-size-fits-all which won't work. This needs to be at least a boot-time configurable, which looks doable with minimal changes to skb_ext setup code. Thanks for feedback.