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Message-ID: <fdc2da16-5680-44cf-bc18-b3e8c0f565fa@linux.dev>
Date: Thu, 1 Feb 2024 15:43:51 +0800
From: Zhu Yanjun <yanjun.zhu@...ux.dev>
To: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, virtualization@...ts.linux.dev
Cc: Richard Weinberger <richard@....at>,
Anton Ivanov <anton.ivanov@...bridgegreys.com>,
Johannes Berg <johannes@...solutions.net>,
"Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Hans de Goede <hdegoede@...hat.com>,
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
Vadim Pasternak <vadimp@...dia.com>, Bjorn Andersson <andersson@...nel.org>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Cornelia Huck <cohuck@...hat.com>, Halil Pasic <pasic@...ux.ibm.com>,
Eric Farman <farman@...ux.ibm.com>, Heiko Carstens <hca@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>, Alexander Gordeev
<agordeev@...ux.ibm.com>, Christian Borntraeger <borntraeger@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>, Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>,
Benjamin Berg <benjamin.berg@...el.com>, Yang Li
<yang.lee@...ux.alibaba.com>, linux-um@...ts.infradead.org,
netdev@...r.kernel.org, platform-driver-x86@...r.kernel.org,
linux-remoteproc@...r.kernel.org, linux-s390@...r.kernel.org,
kvm@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH vhost 00/17] virtio: drivers maintain dma info for
premapped vq
在 2024/1/30 19:42, Xuan Zhuo 写道:
> 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().
>
> Please review.
>
> Thanks
>
> Xuan Zhuo (17):
> 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_new_virtqueue(): pass struct instead of multi parameters
> virtio_ring: reuse the parameter struct of find_vqs()
> 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_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
The above can not be cleanly merged into kernel 6.8-rc2.
Perhaps a base-commit is needed. About base-commit, please see the link
https://people.kernel.org/monsieuricon/all-patches-must-include-base-commit-info
Zhu Yanjun
>
> arch/um/drivers/virtio_uml.c | 29 +-
> drivers/net/virtio_net.c | 298 +++++++---
> 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 | 24 +-
> drivers/virtio/virtio_ring.c | 660 ++++++++++++-----------
> drivers/virtio/virtio_vdpa.c | 33 +-
> include/linux/virtio.h | 10 +-
> include/linux/virtio_config.h | 48 +-
> include/linux/virtio_ring.h | 82 +--
> tools/virtio/virtio_test.c | 4 +-
> tools/virtio/vringh_test.c | 32 +-
> 17 files changed, 812 insertions(+), 610 deletions(-)
>
> --
> 2.32.0.3.g01195cf9f
>
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