linux-kernel - Re: [PATCH RFC v2 05/10] vringh: add vringh_kiov

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Date:   Mon, 1 Feb 2021 13:46:27 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Stefano Garzarella <sgarzare@...hat.com>,
        virtualization@...ts.linux-foundation.org
Cc:     Xie Yongji <xieyongji@...edance.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Laurent Vivier <lvivier@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        linux-kernel@...r.kernel.org, Max Gurtovoy <mgurtovoy@...dia.com>,
        kvm@...r.kernel.org
Subject: Re: [PATCH RFC v2 05/10] vringh: add vringh_kiov_length() helper


On 2021/1/28 下午10:41, Stefano Garzarella wrote:
> This new helper returns the total number of bytes covered by
> a vringh_kiov.
>
> Suggested-by: Jason Wang <jasowang@...hat.com>
> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>


Acked-by: Jason Wang <jasowang@...hat.com>


> ---
>   include/linux/vringh.h | 11 +++++++++++
>   1 file changed, 11 insertions(+)
>
> diff --git a/include/linux/vringh.h b/include/linux/vringh.h
> index 755211ebd195..84db7b8f912f 100644
> --- a/include/linux/vringh.h
> +++ b/include/linux/vringh.h
> @@ -199,6 +199,17 @@ static inline void vringh_kiov_cleanup(struct vringh_kiov *kiov)
>   	kiov->iov = NULL;
>   }
>   
> +static inline size_t vringh_kiov_length(struct vringh_kiov *kiov)
> +{
> +	size_t len = 0;
> +	int i;
> +
> +	for (i = kiov->i; i < kiov->used; i++)
> +		len += kiov->iov[i].iov_len;
> +
> +	return len;
> +}
> +
>   void vringh_kiov_advance(struct vringh_kiov *kiov, size_t len);
>   
>   int vringh_getdesc_kern(struct vringh *vrh,