netdev - Re: [PATCH vhost 00/17] virtio: drivers maintain dma info for premapped vq

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Date: Thu, 1 Feb 2024 17:57:00 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: Zhu Yanjun <yanjun.zhu@...ux.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,
 virtualization@...ts.linux.dev
Subject: Re: [PATCH vhost 00/17] virtio: drivers maintain dma info for premapped vq

On Thu, 1 Feb 2024 15:43:51 +0800, Zhu Yanjun <yanjun.zhu@...ux.dev> wrote:
> 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

The target branch is Michael's vhost.

https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git/log/?h=linux-next

Thanks.

>
> 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
> >
>