From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 41B9BC54798 for ; Thu, 29 Feb 2024 08:21:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:In-Reply-To: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=yYWjbn49/FOaKnxv8tY8E/wAWpBZLZbrgSR43I6LPzc=; b=pgHWzGcttKs/SOwBzuymrvl1JA 1FHiNOv/Bmeut3xJjyndmuSu5lK7BDlO9zDqvpODE6cMp+Fu+u+y4wa4/I18v1ZywCq5LUli6QGGY HllnNqTdjk/ZIJR+t6I5HCQZRJwFz6cG2jwWK2Jnqj+nUwsHwvHaxcSTMIjsEH9q4LGorvLbAS9M2 aV9heXXWpP5CRmn6uN+9ItWlmY2p4zn4ruejASmRFtgIAPtuPMXSVdX8wWT3klgfobhAlYXhUG9Df kaq4GB0U8jk/Bjdb4hQCDh4tGbPWTaqNsF34RoA4FGIh6oLy6UlZcBM0shgviKaql4P6pi3iUIMOK 5DUABZoQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rfbfa-0000000Ccrg-1ons; Thu, 29 Feb 2024 08:21:34 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rfbfX-0000000CcqF-3oRS for linux-um@lists.infradead.org; Thu, 29 Feb 2024 08:21:33 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1709194890; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=yYWjbn49/FOaKnxv8tY8E/wAWpBZLZbrgSR43I6LPzc=; b=T/Zygzf3dqVjgThhvj5sxatIHDR86p07Asu/pudn/xzjxzMv/2aoi6q38U/TEDbDuWuQtx C0GxA7nXh0AwO8uQHYKiJQeLd9Fqv0dsYpA1orrA237nY/QcSEzkQGvO2v7UhAep0oxe0Y N+a0fMyv7uzfTpQ24U7uUkYHm2ICsXo= Received: from mail-lf1-f69.google.com (mail-lf1-f69.google.com [209.85.167.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-451-IFaUkFEZOwubx7fuGPby5w-1; Thu, 29 Feb 2024 03:21:25 -0500 X-MC-Unique: IFaUkFEZOwubx7fuGPby5w-1 Received: by mail-lf1-f69.google.com with SMTP id 2adb3069b0e04-5131aa087beso404348e87.2 for ; Thu, 29 Feb 2024 00:21:24 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1709194883; x=1709799683; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=yYWjbn49/FOaKnxv8tY8E/wAWpBZLZbrgSR43I6LPzc=; b=oGCL3ATj0zbGl7x7BvTjic6RP3z9LIIQPFkWkNixzxAvFlo8xNrYKgCDZVP0bJSfJT tUSiWFTGW1HzfCoZ/farY5mvffNm+jCy5IzCcmL3U6AWarhnVkpmii47euGpZ9tixs5o SXLj7W/Dhf3GcQB97FMxHeMPPvGUH3qrnd7Ztfy+EKlVeTjZZlmx2YVUq5cVmjGuH7pV OtYZyWuP6cqPxhlU2rEHPfpnGAh4Ys6phzpHfd7/F7JdL3gGQUMRErDvFfgE59vUtSDx nlQhG0BHzJ6ri1PcmbUtRNsTM8cPAD57r96dg74R6qL15C8I21GFhSNfDqoR0xNoCkpN K5uA== X-Forwarded-Encrypted: i=1; AJvYcCUaKHwahdX3SEsC1giIQFvgxSfnm4GRNjTOy3w0KJpC2fJTo0FRJHo8w4TnBHRpiJ/FWDfHq8cXw1oJ3xmVU5Ia5VbFS803QcKeKJIi X-Gm-Message-State: AOJu0YwSJBZaep0mwG6lnsoEJ4rprruJP5oYHDimoeRqtfUuGo8R8j7g NYLrhL/Kx86xSkvlJ/XbT5L+mhDKiKmpV9X286JlssSVmR8+2/sz4STC4U+bR6dz2NAsTGc3M88 UxqhJh2KlFCeixJSGMl9x0ePuTjFWWWTr3bMTgVtQ8OWSmJ3jRX5u1yhz1L/5Tg== X-Received: by 2002:a05:6512:2388:b0:513:26e7:440c with SMTP id c8-20020a056512238800b0051326e7440cmr679715lfv.61.1709194883515; Thu, 29 Feb 2024 00:21:23 -0800 (PST) X-Google-Smtp-Source: AGHT+IHnM+zAIJHxVsYzJ0TLR9J0gKcOujhg4JzZrjGf+sjNfANqyY2DOR0YHjNv8O6HjvN3PHqhFQ== X-Received: by 2002:a05:6512:2388:b0:513:26e7:440c with SMTP id c8-20020a056512238800b0051326e7440cmr679694lfv.61.1709194883093; Thu, 29 Feb 2024 00:21:23 -0800 (PST) Received: from redhat.com ([2a02:14f:178:d6b0:a21c:61c4:2098:5db]) by smtp.gmail.com with ESMTPSA id bt6-20020a056000080600b0033db9383e70sm1078294wrb.81.2024.02.29.00.21.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Feb 2024 00:21:22 -0800 (PST) Date: Thu, 29 Feb 2024 03:21:14 -0500 From: "Michael S. Tsirkin" To: Xuan Zhuo Cc: virtualization@lists.linux.dev, Richard Weinberger , Anton Ivanov , Johannes Berg , Jason Wang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Hans de Goede , Ilpo =?iso-8859-1?Q?J=E4rvinen?= , Vadim Pasternak , Bjorn Andersson , Mathieu Poirier , Cornelia Huck , Halil Pasic , Eric Farman , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , linux-um@lists.infradead.org, netdev@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, bpf@vger.kernel.org Subject: Re: [PATCH vhost v3 00/19] virtio: drivers maintain dma info for premapped vq Message-ID: <20240229031755-mutt-send-email-mst@kernel.org> References: <20240229072044.77388-1-xuanzhuo@linux.alibaba.com> MIME-Version: 1.0 In-Reply-To: <20240229072044.77388-1-xuanzhuo@linux.alibaba.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240229_002132_053426_DDD8DCF1 X-CRM114-Status: GOOD ( 27.33 ) X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org On Thu, Feb 29, 2024 at 03:20:25PM +0800, Xuan Zhuo wrote: > As discussed: > http://lore.kernel.org/all/CACGkMEvq0No8QGC46U4mGsMtuD44fD_cfLcPaVmJ3rHYqRZxYg@mail.gmail.com > > If the virtio is premapped mode, the driver should manage the dma info by self. > So the virtio core should not store the dma info. > So we can release the memory used to store the dma info. > > But if the desc_extra has not dma info, we face a new question, > it is hard to get the dma info of the desc with indirect flag. > For split mode, that is easy from desc, but for the packed mode, > it is hard to get the dma info from the desc. And for hardening > the dma unmap is saft, we should store the dma info of indirect > descs. > > So I introduce the "structure the indirect desc table" to > allocate space to store dma info with the desc table. > > On the other side, we mix the descs with indirect flag > with other descs together to share the unmap api. That > is complex. I found if we we distinguish the descs with > VRING_DESC_F_INDIRECT before unmap, thing will be clearer. > > Because of the dma array is allocated in the find_vqs(), > so I introduce a new parameter to find_vqs(). > > Note: > this is on the top of > [PATCH vhost v1] virtio: packed: fix unmap leak for indirect desc table > http://lore.kernel.org/all/20240223071833.26095-1-xuanzhuo@linux.alibaba.com > > Please review. > > Thanks > > v3: > 1. fix the conflict with the vp_modern_create_avq(). Okay but are you going to address huge memory waste all this is causing for - people who never do zero copy - systems where dma unmap is a nop ? You should address all comments when you post a new version, not just what was expedient, or alternatively tag patch as RFC and explain in commit log that you plan to do it later. > v2: > 1. change the dma item of virtio-net, every item have MAX_SKB_FRAGS + 2 > addr + len pairs. > 2. introduce virtnet_sq_free_stats for __free_old_xmit > > v1: > 1. rename transport_vq_config to vq_transport_config > 2. virtio-net set dma meta number to (ring-size + 1)(MAX_SKB_FRGAS +2) > 3. introduce virtqueue_dma_map_sg_attrs > 4. separate vring_create_virtqueue to an independent commit > > > > Xuan Zhuo (19): > virtio_ring: introduce vring_need_unmap_buffer > virtio_ring: packed: remove double check of the unmap ops > virtio_ring: packed: structure the indirect desc table > virtio_ring: split: remove double check of the unmap ops > virtio_ring: split: structure the indirect desc table > virtio_ring: no store dma info when unmap is not needed > virtio: find_vqs: pass struct instead of multi parameters > virtio: vring_create_virtqueue: pass struct instead of multi > parameters > virtio: vring_new_virtqueue(): pass struct instead of multi parameters > virtio_ring: simplify the parameters of the funcs related to > vring_create/new_virtqueue() > virtio: find_vqs: add new parameter premapped > virtio_ring: export premapped to driver by struct virtqueue > virtio_net: set premapped mode by find_vqs() > virtio_ring: remove api of setting vq premapped > virtio_ring: introduce dma map api for page > virtio_ring: introduce virtqueue_dma_map_sg_attrs > virtio_net: unify the code for recycling the xmit ptr > virtio_net: rename free_old_xmit_skbs to free_old_xmit > virtio_net: sq support premapped mode > > arch/um/drivers/virtio_uml.c | 31 +- > drivers/net/virtio_net.c | 283 ++++++--- > drivers/platform/mellanox/mlxbf-tmfifo.c | 24 +- > drivers/remoteproc/remoteproc_virtio.c | 31 +- > drivers/s390/virtio/virtio_ccw.c | 33 +- > drivers/virtio/virtio_mmio.c | 30 +- > drivers/virtio/virtio_pci_common.c | 59 +- > drivers/virtio/virtio_pci_common.h | 9 +- > drivers/virtio/virtio_pci_legacy.c | 16 +- > drivers/virtio/virtio_pci_modern.c | 38 +- > drivers/virtio/virtio_ring.c | 698 ++++++++++++----------- > drivers/virtio/virtio_vdpa.c | 45 +- > include/linux/virtio.h | 13 +- > include/linux/virtio_config.h | 48 +- > include/linux/virtio_ring.h | 82 +-- > tools/virtio/virtio_test.c | 4 +- > tools/virtio/vringh_test.c | 28 +- > 17 files changed, 847 insertions(+), 625 deletions(-) > > -- > 2.32.0.3.g01195cf9f