From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f43.google.com (mail-pj1-f43.google.com [209.85.216.43]) (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 A772D1FAC42 for ; Wed, 19 Nov 2025 00:49:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.43 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763513398; cv=none; b=JhShovunxUK9bwF+BWRLoMtJt5kDX1ZVkijLScSSHtm/2f0S5C95kZ64H/YnNka4qaAdPUnZ2sZ9V7097YIHxaBCJksLOP4vaaAf4Zstib4XKrZl5258G+27rp8zirWjZ5lhw2rXQeq5+cfUhtRFekVgCah5GCzkS7nptovkRXA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763513398; c=relaxed/simple; bh=oKXTLH9B+kZojIKvhH48FM80MY3iGUiNLr6BAXfHHf0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=G9Y3DE4CSEZ4MMisS6opRR8bzyQICIGD6WCBPKjGFVoToGg+qcvVxqSVayE+CURsvR1HptOwQXnfXyaHpYpppJp3WiDT/IK6OuXPOPEVVKBrg0nwt2QHfvEiTf98MK2VZUl/+nO5CKxlYa4FVH+a/VKgy0wrdqlABRQff+LL9BA= 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=jXWJiPPF; arc=none smtp.client-ip=209.85.216.43 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="jXWJiPPF" Received: by mail-pj1-f43.google.com with SMTP id 98e67ed59e1d1-3436d6aa66dso259973a91.1 for ; Tue, 18 Nov 2025 16:49:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1763513396; x=1764118196; 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=u1JZP4mJOczUNP4pl5LS4F0RC54qpkfUlqRw4pgbJgQ=; b=jXWJiPPF/UyM0htAyQWXtj40Uto5qRz23YbBn/9oqGsaRuEGDnXuQ8Kd0EFJHaBELl TsAbquFUn+QQLSYHIcIAzij4QUoIjTjZ2DOoYzdmY2eKInS0w6FS1fFNZKO5IRz3RwmM NgGJ4yLsxL7rbywK3zRyPFGMYLEYerSAXw879U8rLCWj6QYkTISG8yWHgNy4EwYsjsgA zY+67FuqJG7aRkJzTUyIg50qC44GUGYgol2YVXkRlNp0i4iNlkwFwmDhiHOv77hNxZso LmXpywxxpl1QkOwDDyIS/AK5m8VnKqbc8TwrBYYM2LTt5oKz2pIOduQLk666eR9IaTM6 3sMA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763513396; x=1764118196; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=u1JZP4mJOczUNP4pl5LS4F0RC54qpkfUlqRw4pgbJgQ=; b=pObh9nDEXswkm2B76Iv1K4eTzpdjbaicWZcPh5L9lfSvKFkWcHSFvachmP/BYslRV0 t7puw/f0DHREzj6aSGzwis2vc+Ra32HcoBeoBL+HJOIbP+cgYQG4UOVzRns2VjCwr2MC Rjt8rxgWDjOLtV2vIKVffXZ68OmSS8zSY22RWcZs2dHDHO96uIju0jTK3uHnStmVUcUz 86JO0NB4LCFzyzWgfvyfWRZIAWwtU/31Ewjfbeba9VptQnRBf7dTtDlgZrehUPgRUnIK +1LZlKCNDN2UEN8/SpCC1hPqrcZuFLMqW8r5GogWlfRAv1+la8R5eOrf5fa17X7+lMR9 uvkg== X-Forwarded-Encrypted: i=1; AJvYcCXnwtynnkM+suSYtPJvDzDrjiK80sv4izHZG4MxHRgZ3l0p8rW+ux+kRFVAYkhfVDRG1iYzjddBymsG67A=@vger.kernel.org X-Gm-Message-State: AOJu0YxrpB9/m08Qrre/FRBfXeYZZQ+gW9gkpepkwcZ1xYx5SMn5ycHE TnhnezhyKk34bprKf/n1pB0JjQHvztzizMqilCekO0sW1XQ+lOBUU97f X-Gm-Gg: ASbGncsnbk0V0g3wtbgQt4lbNShg7axsz/Mm6VHFsgqI+fKLtb/+JTublrNcCAMAxs6 ZFbepTgR27MEclCqllYf0FPyebUGMKv1pOnXqoHDlwvvPbhh5GYm6kj9xyZ0/4LgQNJu3WK5JHq p1FLGFN/0dD9oSaB+34I+/37ofFHU8V2Ow+0QTBp+r1pCZPSEYy4c7xag2RgNMdAiLy0LFQjkoD /Qz3ax5UXdk//WjOGuS1ox8qNWLRwZC2/MaxkkgaYqFMW08c4hskMOrgOUJiob0yREiHpQP0Nxo hErE6r1hwvu/u8eSIeLcYX+AMieTUMeldPM1+6sSed78w2pn41uDSmy0klww7jV3Sr6PfBN+i9i X4FxbWM8gYx7uMLktM+4ppo/EhSWq2V3RiHQp6yVbrLFPL1QMwC8k1UImySDIs3uFix0bPswEBq YW+/ic0hLTiq4mScnpqWWWQ8EGeiyTToYt/z7rWQ== X-Google-Smtp-Source: AGHT+IE8JxmF1L3MBeFjrjhCVliPKr3nWeWpK8dN326PMLP1SXtwFKRVIWLKhkDIZdOHuuTrc26bbg== X-Received: by 2002:a17:90b:1345:b0:340:29a3:800f with SMTP id 98e67ed59e1d1-345bd3038cemr513343a91.15.1763513396057; Tue, 18 Nov 2025 16:49:56 -0800 (PST) Received: from lima-default ([103.246.102.164]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-345bbfc8d8esm704033a91.2.2025.11.18.16.49.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Nov 2025 16:49:55 -0800 (PST) Date: Wed, 19 Nov 2025 11:49:44 +1100 From: Alessandro Decina To: Maciej Fijalkowski Cc: "Loktionov, Aleksandr" , "netdev@vger.kernel.org" , "David S. Miller" , Alexei Starovoitov , Andrew Lunn , Daniel Borkmann , Eric Dumazet , Jakub Kicinski , Jesper Dangaard Brouer , John Fastabend , Paolo Abeni , "Kitszel, Przemyslaw" , Stanislav Fomichev , "Sarkar, Tirthendu" , "Nguyen, Anthony L" , "bpf@vger.kernel.org" , "intel-wired-lan@lists.osuosl.org" , "linux-kernel@vger.kernel.org" Subject: Re: [Intel-wired-lan] [PATCH net v4 1/1] i40e: xsk: advance next_to_clean on status descriptors Message-ID: References: <20251118113117.11567-1-alessandro.d@gmail.com> <20251118113117.11567-2-alessandro.d@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@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: On Tue, Nov 18, 2025 at 07:45:24PM +0100, Maciej Fijalkowski wrote: > Repro steps would be nice to have, rest would be rather redundant to me. Yeah unfortunately I don't really know how to _manually_ reproduce. I don't know why I'm getting these status descriptors, but I'm getting them reproducibly every few minutes on ubuntu 24.04 across 3 machines where I've hit this bug/tested the fix. The machines are doing ~300Mbps of UDP traffic, some of which is done using AF_XDP. The AF_XDP code is TX only, so it's executing the build-skb-in-zc-path all the time as all the ingress traffic goes to sockets. If you have any idea on how to reliably produce the descriptors I'm happy to give it a try.