netdev - Re: [PATCH v2 0/9] virtio: support advance DMA

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Date:   Wed, 30 Mar 2022 16:38:18 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Cc:     virtualization <virtualization@...ts.linux-foundation.org>,
        netdev <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        "open list:XDP (eXpress Data Path)" <bpf@...r.kernel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH v2 0/9] virtio: support advance DMA

On Wed, Mar 30, 2022 at 2:59 PM Xuan Zhuo <xuanzhuo@...ux.alibaba.com> wrote:
>
> On Wed, 30 Mar 2022 14:56:17 +0800, Jason Wang <jasowang@...hat.com> wrote:
> > On Wed, Mar 30, 2022 at 2:34 PM Michael S. Tsirkin <mst@...hat.com> wrote:
> > >
> > > On Thu, Feb 24, 2022 at 07:03:53PM +0800, Xuan Zhuo wrote:
> > > > virtqueue_add() only supports virtual addresses, dma is completed in
> > > > virtqueue_add().
> > > >
> > > > In some scenarios (such as the AF_XDP scenario), DMA is completed in advance, so
> > > > it is necessary for us to support passing the DMA address to virtqueue_add().
> > >
> > > I picked up a couple of patches. Others are waiting for some acks
> > > (Jason?) and improved commit logs for documentation.
> >
> > I will review them.
>
> hi, the core code of premapped, I will merge it into 'virtio pci support
> VIRTIO_F_RING_RESET' because this function will be used when reusing the buffer
> after resize.

I still prefer not to do that.

We can make rest work for resize first and add pre mapping on top. It
will simplify the review.

Thanks

>
> Thanks.
>
>
> >
> > Thanks
> >
> > >
> > > Thanks!
> > >
> > > > v2:
> > > >     1. rename predma -> premapped
> > > >     2. virtio net xdp tx use virtio dma api
> > > >
> > > > v1:
> > > >    1. All sgs requested at one time are required to be unified PREDMA, and several
> > > >       of them are not supported to be PREDMA
> > > >    2. virtio_dma_map() is removed from this patch set and will be submitted
> > > >       together with the next time AF_XDP supports virtio dma
> > > >    3. Added patch #2 #3 to remove the check for flags when performing unmap
> > > >       indirect desc
> > > >
> > > > Xuan Zhuo (9):
> > > >   virtio_ring: rename vring_unmap_state_packed() to
> > > >     vring_unmap_extra_packed()
> > > >   virtio_ring: remove flags check for unmap split indirect desc
> > > >   virtio_ring: remove flags check for unmap packed indirect desc
> > > >   virtio_ring: virtqueue_add() support premapped
> > > >   virtio_ring: split: virtqueue_add_split() support premapped
> > > >   virtio_ring: packed: virtqueue_add_packed() support premapped
> > > >   virtio_ring: add api virtio_dma_map() for advance dma
> > > >   virtio_ring: introduce virtqueue_add_outbuf_premapped()
> > > >   virtio_net: xdp xmit use virtio dma api
> > > >
> > > >  drivers/net/virtio_net.c     |  42 +++++-
> > > >  drivers/virtio/virtio_ring.c | 280 ++++++++++++++++++++++++++---------
> > > >  include/linux/virtio.h       |  12 ++
> > > >  3 files changed, 254 insertions(+), 80 deletions(-)
> > > >
> > > > --
> > > > 2.31.0
> > >
> >
>