From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=74.125.229.9 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793745818; b=fSMqLm4QEnOX5hz/2uecwb2opJf6MoRdkkcnN/HZft6EVBgCg1VPulII2ve9CjWynh1v 0rn+ZFyuufVDjSZERPKwqLMrIZ9ZCWeldT7HVBgPCrRCUkNiFHivgJ9l4itOQr/QfGxYK cEfTjZ3j9m4HkR4KNjce79PCIrP9x5rgzrxJ9CN2LDvW6MTgY2O8KiF4Tb+ULgPHLzqir KU122t2R4jM28phGnOfc+N5QRVvhelqYqlN70V2ar8or1/CDucLCjA5usTTzKJfhwyDKu TV7a+oIQ45hICXMYHa5Mfl2BbVn+0Z4umAzxtMXwG5FHld5BWQS6WFDkXqJK2dmrd3Q== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793745818; h=DMARC-Filter:Received:DKIM-Signature:X-Google-DKIM-Signature: X-Gm-Message-State:X-Gm-Gg:X-Received:Received:Date:From:To:Cc: Subject:Message-ID:References:MIME-Version:Content-Type: Content-Disposition:In-Reply-To; bh=TEsmJhHG6UzOUAsN1CLfuPQCNGFTSJjKfJhnGZfHeUo=; b=Bue3+hQvRh65S5SvyKaq9dxcW+nky0gq0t3yDQynls3kHECE/ErAz2YKctv1gltVL8am M06AWmJT3rg0dsQFKwQhi7x7EJFX2jD+Sgh5n4I+zPZRhXEdebVwUTqNdmjDz5ewy+wC7 5os/dDQNDPM+jUMdMSNOW7rt9lbIBhKc6FigtkuM0LjcUJlLMRE0S6IMrX9B7RvnlIjUd NjKdUvOwgrIGKCZzpGt6DF1OgWqcEBPZxdVjvzp/1ZMfvmrGcVN1gWxaMWG7SMuVuHWtI B7PFe6h9QHoDPb5nEwQ06Ma3jNnhmD1tgdiL2GOsM6o1Vsq61zGnbZdf4gnQl+ll7aw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b="nSm1Ta/L"; arc=none smtp.remote-ip=74.125.229.9 Received: from mail-dy2-f9.google.com (mail-dy2-f9.google.com [74.125.229.9]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3D40B606A31B for ; Tue, 3 Nov 2026 22:43:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 3D40B606A31B 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, unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=nSm1Ta/L Received: by mail-dy2-f9.google.com with SMTP id 5a478bee46e88-3678f64d078so38494eec.1 for ; Tue, 03 Nov 2026 14:43:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20260707; t=1793745817; x=1794350617; darn=vger.kernel.org; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:from:to:cc:subject :date:message-id:reply-to:content-type; bh=TEsmJhHG6UzOUAsN1CLfuPQCNGFTSJjKfJhnGZfHeUo=; b=nSm1Ta/LRGVYs7LSmDicg4qmLY+G3QKwOL6aUalRgmoK+cIOBxQOc6eQQ72XYNymGk 1WjM6CiaaNZpDFPIYFWywDYD28bYZqKUI1qOJ9/6cCvuKVnmzVEIZtYlWX4uQeL4rDrQ In/H52J/vIpQLculr4W56KeYPDFPpiXr6NGH8+4lDLej8vMr0dCSTMnR7J8/gsJvj5wy fduWdiVgaax7kmUfpEagXnqcGhgF9AnPobHCc9NBLlWIWb5xxZ2OqVEMkisW5E3iVAmj sXonf6pxJ8mRtSHNJK+vrB0K0nak3/2yF3P+RlcjY2hdbBw59GdWH/6OmT+LHjGpWCo7 S7iA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1793745817; x=1794350617; h=in-reply-to:content-disposition:content-type: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 :content-type; bh=TEsmJhHG6UzOUAsN1CLfuPQCNGFTSJjKfJhnGZfHeUo=; b=hDmGGjIDJVYhjedWYOh+Cqt4sFdhF/VaSK5FYY9GZihgZenXHC5FiScUJWSwdsxcjO H/yxF0xA3lNZolsZuYHgEcz7lCejq+4hxT2lqLPI8KoFyaZtUOb1oSY1i5Qmf6T0ts2n AcuM4+FH9MOaI4g1VR12Gj7gRSXWiLuNDEDzomRvSL8mrg4KfTr9Ku/wZ1jk4nBm+gn6 AMYyOdQoKGhU4fP+/w3ggnWQtsddGaLQ0roM4uE4atzDaNHjSNzFQdri7dzQCXab07oR fve7cuTnF/+PhCFEAcx2CO0Q0jU0XP/sM1ibFkpudb+DQIchBFmOTzxmTPGZWUH0//HO tcAw== X-Gm-Message-State: APuU4Z8ASWQ+B8etre3ARZSHsOjidv4PpAVi4or8iz+Nb12wnMDgAjK6 k5XDNHDblgf8KG0bjOnZ23WfGKqEYawANl4ACcJMDyK000noUbg14CiEIyu9iWms X-Gm-Gg: AYBFou03ahMnYLXvTXd9FvVhohxHvcRJpC6SmVTRrBl8RUqbs0Mmq7MAsl2phK/D9z/ pvOXXgim3Dw5k5I1yiIqerFSnbdbEBVe7aV3iKZEr5Ys8DYBp4jt/wYk1XmtLeAK4bpc2lcBJ4t 2RJAMQDYw5KhfYr8sb0Od/3CBywPKt4nyGoy4zq76leO2az4YIEFGLXYOtXEbpPAof+bbzelH7F ZYB80sMM7AazKyNBmUvNKme2FVcRipeLbgvcXg4efWzbt6F8/EfNKfGLpjO4s5g1WitbWRr0IZe bRTE22DYR88dgB4tqTqo/IouCWA0GkUOZG34tb1iiyGaWBX1FwPLI6qG6uJMzUPRNntnhnl1xgy N0OaMZnWFCimlZ83J7NJoBz9TN1GdBsJZUehcqPNCAFJn3EzetdG8Oa6bio9YpGLpCdyEMS6k2n EBP3gdnZY+Q3snbcbNgtBq5hwLavwOot4cjimG3ZWC1e9xHx4dauisKLGuIu+BMiQp8B/7hF1UQ HsDWwUt6ixjE1FLxZzlDqzMwu4NGnzfvcCW+6BADsjChatH+6JKT0eSiyOdkGJg+ROFrdPcBC6q RwHeTaaDxYNnGmSERSgSgQ== X-Received: by 2002:a05:693c:87c2:20b0:36a:6ae5:23e2 with SMTP id 5a478bee46e88-36a6ae52e67mr10824936eec.17.1793745816953; Tue, 03 Nov 2026 14:43:36 -0800 (PST) Received: from localhost ([2a03:2880:9ff:64::]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36ca39b8eb3sm1372736eec.27.2026.11.03.14.43.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Nov 2026 14:43:36 -0800 (PST) Date: Tue, 3 Nov 2026 14:42:13 -0800 From: Stanislav Fomichev To: Mina Almasry Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Jakub Kicinski , Willem de Bruijn , Eric Dumazet , Kaiyuan Zhang , io-uring@vger.kernel.org, Stanislav Fomichev , Paolo Abeni , "David S. Miller" , Simon Horman , Pavel Begunkov , Jens Axboe , Bobby Eshleman , Daniel Borkmann , Neal Cardwell , Kuniyuki Iwashima , David Ahern , Ido Schimmel Subject: Re: [PATCH net-next v2 2/4] netmem: store memory provider private pointer directly in struct net_iov Message-ID: References: <20261102231827.4088254-1-almasrymina@google.com> <20261102231827.4088254-3-almasrymina@google.com> X-Mailing-List: netdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20261102231827.4088254-3-almasrymina@google.com> On 11/02, Mina Almasry wrote: [..] > Resolving the memory provider instance from a struct net_iov currently > chases niov->owner (struct net_iov_area) and then dereferences the > provider-specific container struct (such as net_devmem_dmabuf_binding > or io_zcrx_area->ifq). Chasing niov->owner is true, but I don't see another dereference you're talking about? net_devmem_iov_binding does container_of to get from area to the binding (and the area is the first member of the binding, so it is a already a nop). And IIRC, iou has a similar arrangement. So I'd vote to keep things as is unless you explain what I'm missing.