linux-kernel - Re: [PATCH v4 1/1] vringh: IOMEM support

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Message-ID: <ZHtQybyy3qg+xw10@corigine.com>
Date:   Sat, 3 Jun 2023 16:40:09 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Shunsuke Mie <mie@...l.co.jp>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Rusty Russell <rusty@...tcorp.com.au>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/1] vringh: IOMEM support

On Fri, Jun 02, 2023 at 02:52:11PM +0900, Shunsuke Mie wrote:
> Introduce a new memory accessor for vringh. It is able to use vringh to
> virtio rings located on io-memory region.
> 
> Signed-off-by: Shunsuke Mie <mie@...l.co.jp>

...

> +/**
> + * vringh_iov_pull_iomem - copy bytes from vring_iov.

Hi Mie-san,

as it looks like there will be a v2,
please consider documenting the vrh parameter here.

> + * @riov: the riov as passed to vringh_getdesc_iomem() (updated as we consume)
> + * @dst: the place to copy.
> + * @len: the maximum length to copy.
> + *
> + * Returns the bytes copied <= len or a negative errno.
> + */
> +ssize_t vringh_iov_pull_iomem(struct vringh *vrh, struct vringh_kiov *riov,
> +			      void *dst, size_t len)
> +{
> +	return vringh_iov_xfer(vrh, riov, dst, len, xfer_from_iomem);
> +}
> +EXPORT_SYMBOL(vringh_iov_pull_iomem);
> +
> +/**
> + * vringh_iov_push_iomem - copy bytes into vring_iov.

And here.

> + * @wiov: the wiov as passed to vringh_getdesc_iomem() (updated as we consume)
> + * @src: the place to copy from.
> + * @len: the maximum length to copy.
> + *
> + * Returns the bytes copied <= len or a negative errno.
> + */
> +ssize_t vringh_iov_push_iomem(struct vringh *vrh, struct vringh_kiov *wiov,
> +			      const void *src, size_t len)
> +{
> +	return vringh_iov_xfer(vrh, wiov, (void *)src, len, xfer_to_iomem);
> +}
> +EXPORT_SYMBOL(vringh_iov_push_iomem);

...