netdev - Re: [PATCH v5 4/9] vringh: define the stride used for translation

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Date:   Tue, 11 Apr 2023 13:40:41 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org, eperezma@...hat.com,
        stefanha@...hat.com,
        Andrey Zhadchenko <andrey.zhadchenko@...tuozzo.com>,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, "Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH v5 4/9] vringh: define the stride used for translation

On Tue, Apr 4, 2023 at 9:14 PM Stefano Garzarella <sgarzare@...hat.com> wrote:
>
> Define a macro to be reused in the different parts of the code.
>
> Useful for the next patches where we add more arrays to manage also
> translations with user VA.
>
> Suggested-by: Eugenio Perez Martin <eperezma@...hat.com>
> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>

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

Thanks

> ---
>
> Notes:
>     v4:
>     - added this patch with the changes extracted from the next patch [Eugenio]
>     - used _STRIDE instead of _SIZE [Eugenio]
>
>  drivers/vhost/vringh.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c
> index 0ba3ef809e48..4aee230f7622 100644
> --- a/drivers/vhost/vringh.c
> +++ b/drivers/vhost/vringh.c
> @@ -1141,13 +1141,15 @@ static int iotlb_translate(const struct vringh *vrh,
>         return ret;
>  }
>
> +#define IOTLB_IOV_STRIDE 16
> +
>  static inline int copy_from_iotlb(const struct vringh *vrh, void *dst,
>                                   void *src, size_t len)
>  {
>         u64 total_translated = 0;
>
>         while (total_translated < len) {
> -               struct bio_vec iov[16];
> +               struct bio_vec iov[IOTLB_IOV_STRIDE];
>                 struct iov_iter iter;
>                 u64 translated;
>                 int ret;
> @@ -1180,7 +1182,7 @@ static inline int copy_to_iotlb(const struct vringh *vrh, void *dst,
>         u64 total_translated = 0;
>
>         while (total_translated < len) {
> -               struct bio_vec iov[16];
> +               struct bio_vec iov[IOTLB_IOV_STRIDE];
>                 struct iov_iter iter;
>                 u64 translated;
>                 int ret;
> --
> 2.39.2
>