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

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Message-ID: <78f77d87-5499-b68c-298d-d49e740a2cc1@igel.co.jp>
Date:   Mon, 5 Jun 2023 10:51:34 +0900
From:   Shunsuke Mie <mie@...l.co.jp>
To:     Simon Horman <simon.horman@...igine.com>
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

Hi Simon-san,

On 2023/06/03 23:40, Simon Horman wrote:
> 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.
It was missing an explanation. I will address that and review this patch.
Thank you.
>
>> + * @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.
I do the same.
>> + * @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);
> ...

Best regards,

Shunsuke