From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm2-f13.google.com (mail-wm2-f13.google.com [74.125.225.141]) (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 50E893B388D for ; Sun, 27 Sep 2026 18:13:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.225.141 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790532833; cv=none; b=VtJBbzBrl3GbmCDd7sl3DgwU95e45dtIq0Jpv7pG5c9iXRci6NLbjfQHTCIexpMd/p3ROAFjgMgdRzfjq3x2pXoyEkN2Zq0LfbctuqEGS/eGS+sElrPaL6+x19aQVqSkLn/cmllPyRvodAzfGRRoXu2M/gxGw/GSzVbXkVwhq8k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790532833; c=relaxed/simple; bh=3oTqZsbJwBRoOJpwLKg7GnbiVVZPitNE8J6RjqQk/4U=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=aXDCjqY8kFoVEDa+55Hi6JHguyGaQBy7a/gFjbddms6nTC0IC7yeLS/7vVbUZlUIbzU7TqljMXXv2hGW/X0OJTLsD8zLaKSU4YPVLgOXF52fwlIjABtRQYyzG90ohJQnx6xzW8kFuqRAovpTdYa0ail4kAzJimU62uS6ORJXubU= 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=JF9gFlGp; arc=none smtp.client-ip=74.125.225.141 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="JF9gFlGp" Received: by mail-wm2-f13.google.com with SMTP id 5b1f17b1804b1-49b912d822dso17352665e9.2 for ; Sun, 27 Sep 2026 11:13:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1790532830; x=1791137630; darn=vger.kernel.org; h=content-transfer-encoding:content-type:in-reply-to:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:from:to:cc:subject:date:message-id:reply-to :content-type; bh=yF3ar6bs1d3X9n2jCLXGnKhuTUv7JBFcQdF8WKwyH2w=; b=JF9gFlGpgwPJb82PVdfCZRfJ3WDPJZTdO4VhQ/I64R3nqQyNoHTIU/TUvxW944Tf8G gdtXvAsgkx1kTuIVShCwvkuPvzbySf8OqLTsXMNY8ttU574BLotez4mM77FWagv5ESm5 a+XMKtIaOTAqqTavfP8qSxxjUWqJ4gzn/O/Mp3TJ4Q1zh1A8XnhxAE4ZKuwruXtxztmV K3hl9eRg0uWIoQWI1HE6DwZUIACZdUpZjrtxuQ1slvCzwz06+ek0JEwyg77OXAadJg9B ZewnVUsTsGUQcRjvbLKi/3vDn5Ak9EnuGPoNpx+JVtKMw0OqK/cWttbkbSl6ijFROE/+ IUVA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790532830; x=1791137630; h=content-transfer-encoding:content-type:in-reply-to:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=yF3ar6bs1d3X9n2jCLXGnKhuTUv7JBFcQdF8WKwyH2w=; b=P5GeK8VQSSUXqPtkAI908lGIFWpySXlzcYZEEdoGti/yX7WecIPFb60CXLFwFmn7zv kMpcsjHFb2qPxi2/3b7JsCVFpGMupw8DlZvp28xbhRRfWHU70lCHbJiClKK3rvZTF8WS IJ9gmTOcXwDUQ9nHov/qmb5lEc0ZjmkHVa5BiTYebiM6kw2mTeHjK25ibAhjlRIy1wOg e75cquw0dRZ3wuEx212i60hw2EhrCLFHmDP5T4+NWmVMmESNouuND9C4Ft8EKtLECUY5 k1dJ+/HyYtIfqZPFV2ImHRGtyxg9+SiTG4vOrnqNDOQHUw9JrPPa9wGJQb3bN2qM6fMD XCOw== X-Forwarded-Encrypted: i=1; AKwUvByERSw09A1a/kcaQMCh+NWBhQtfsLE3K8fwO26qau9JFFCxdZtAFnM45M0CTYw+w2gbpnw+8LIa99dnSNE=@vger.kernel.org X-Gm-Message-State: AFuF++l9eRB2aiEUsZDqDCWPpwXGcgwz8BcbfuSoA1bCfSav4yAhEVN8 gfTBx6nrr/oq7TBPXZOHcA54GGL05JHzTi6hQWop8eDiRac9hsX49Ae7 X-Gm-Gg: AYBFou2DQNKHsX5FBSxLXiBmaQvonea+7EbrTyJ6cErJNdTBoNhUuV/e4HDQkOfQ/xm IFRCy8WZLLojaJrYqgohYsoIy3guZaNJyL2vKF/+3ZjstDrMVnRfLSVJHRpESM8oe5jB/hvb+O3 Ib3b5X2SBuZ7MiDBOaei2JwvrcKw4rJdqQQmFd6VpdsRBA8vbL97r8/uxy58qYEoDll9nOytghl 035kMiXkgGAZS3zH+ed0we9lP62YZ3XcLYGHy6vLZ+87DVZ7Vme0DbGc/A39iwbv90a4i+577Wn FaTALYnr7PPe0DnfDOw17Wf755KqMq3FfORH3y64ExFEnkIyWVhuBdXFuXKv3fSFMCRfVhObm77 Uf9cbe7Zp3igJRj2WPfK7+1JrhjQ6NoFapE6EMASRbb7lrD32YNmJsq2kwwyUPS//3PuNye+w7o /Bg6ygSiz4x90xRQ5CH7Pr8rAy2/6RHonKJXSnaLg8ZG54CwS4lhPdg+1Ddznw3UEJJHjuUsWsE QgeOU03V622ceE7cPbgfDqjHj5qsPCLRnLqSgRLhYFicnFA70M7h/qIHFlVAk04QDZ1JytIg/H+ uMxEXdzLOWZeoDZLH2ocGx4DykLiFot1W2jb7e+zDs7Eya01 X-Received: by 2002:a05:600c:1d06:b0:49e:69ff:c6b1 with SMTP id 5b1f17b1804b1-49fe7bcc25dmr179111265e9.31.1790532830326; Sun, 27 Sep 2026 11:13:50 -0700 (PDT) Received: from ?IPV6:2a01:4b00:bd21:4f00:7cc6:d3ca:494:116c? ([2a01:4b00:bd21:4f00:7cc6:d3ca:494:116c]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49ff141948dsm89612395e9.1.2026.09.27.11.13.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 27 Sep 2026 11:13:49 -0700 (PDT) Message-ID: Date: Sun, 27 Sep 2026 19:13:47 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next 2/3] net: devmem: use memory provider helpers for net_iovs To: Stanislav Fomichev , netdev@vger.kernel.org Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, hawk@kernel.org, ilias.apalodimas@linaro.org, axboe@kernel.dk, sdf@fomichev.me, bobbyeshleman@meta.com, almasrymina@google.com, kaiyuanz@google.com, linux-kernel@vger.kernel.org, io-uring@vger.kernel.org References: <20260922204348.717198-1-sdf@fomichev.me> <20260922204348.717198-3-sdf@fomichev.me> Content-Language: en-US From: Pavel Begunkov In-Reply-To: <20260922204348.717198-3-sdf@fomichev.me> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 9/22/26 21:43, Stanislav Fomichev wrote: > Use public memory-provider helpers for DMA address storage and page-pool > association instead of open-coding page_pool state and accounting. > > Zero the net_iov array because net_mp_niov_set_page_pool() ORs > PP_SIGNATURE into pp_magic. Reject DMA addresses that cannot be > represented in net_iov metadata. Reviewed-by: Pavel Begunkov > @@ -247,7 +245,7 @@ net_devmem_bind_dmabuf(struct net_device *dev, void *vdev, > goto err_unmap; > } > } > - binding->area.niovs = kvmalloc_objs(*binding->area.niovs, > + binding->area.niovs = kvzalloc_objs(*binding->area.niovs, > binding->area.num_niovs); > if (!binding->area.niovs) { > err = -ENOMEM; > @@ -274,8 +272,12 @@ net_devmem_bind_dmabuf(struct net_device *dev, void *vdev, > for (i = 0; i < nr_niovs; i++, niov_idx++) { > niov = &binding->area.niovs[niov_idx]; > net_iov_init(niov, &binding->area, NET_IOV_DMABUF); > - page_pool_set_dma_addr_netmem(net_iov_to_netmem(niov), > - dma_addr); > + if (net_mp_niov_set_dma_addr(niov, dma_addr)) { I'd do this chunk as a separate patch with stable+fix tags to keep it minimal and help backporting, e.g. if (page_pool_set_dma_addr_netmem()) // fail; Looks like the bot was saying the same (with an extra wall of text), but I guess it depends on whether you need it backported. > + err = -EFAULT; > + NL_SET_ERR_MSG(extack, > + "dmabuf DMA address cannot be represented"); > + goto err_free_niovs; > + } > if (direction == DMA_TO_DEVICE) > binding->tx_vec[niov_idx] = niov; -- Pavel Begunkov