netdev - Re: [PATCH vhost 05/17] virtio_ring: split: structure the indirect desc table

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Message-ID: <CACGkMEst-k1uOUA6diC2yB+=9ZYezuz=n3=kAzDFpXLxGE=etQ@mail.gmail.com>
Date: Wed, 31 Jan 2024 17:12:25 +0800
From: Jason Wang <jasowang@...hat.com>
To: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Cc: virtualization@...ts.linux.dev, Richard Weinberger <richard@....at>, 
	Anton Ivanov <anton.ivanov@...bridgegreys.com>, Johannes Berg <johannes@...solutions.net>, 
	"Michael S. Tsirkin" <mst@...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 05/17] virtio_ring: split: structure the indirect
 desc table

On Tue, Jan 30, 2024 at 7:42 PM Xuan Zhuo <xuanzhuo@...ux.alibaba.com> wrote:
>
> This commit structure the indirect desc table.
> Then we can get the desc num directly when doing unmap.
>
> And save the dma info to the struct, then the indirect
> will not use the dma fields of the desc_extra. The subsequent
> commits will make the dma fields are optional. But for
> the indirect case, we must record the dma info.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> ---
>  drivers/virtio/virtio_ring.c | 86 ++++++++++++++++++++++--------------
>  1 file changed, 52 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 2b41fdbce975..831667a57429 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -67,9 +67,16 @@
>  #define LAST_ADD_TIME_INVALID(vq)
>  #endif

[...]

> +               kfree(in_desc);
>                 vq->split.desc_state[head].indir_desc = NULL;
> -

Unnecessary changes.

Thanks


>         }
>
>         vq->split.desc_extra[i].next = vq->free_head;
> --
> 2.32.0.3.g01195cf9f
>