linux-kernel - Re: [PATCH net-next 6/8] virtio: introduce packed ring defines

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Date:   Wed, 4 Jul 2018 22:15:01 +0200
From:   Maxime Coquelin <maxime.coquelin@...hat.com>
To:     Jason Wang <jasowang@...hat.com>, mst@...hat.com,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     wexu@...hat.com, tiwei.bie@...el.com, jfreimann@...hat.com
Subject: Re: [PATCH net-next 6/8] virtio: introduce packed ring defines



On 07/03/2018 07:38 AM, Jason Wang wrote:
> diff --git a/include/uapi/linux/virtio_ring.h b/include/uapi/linux/virtio_ring.h
> index 6d5d5fa..71c7a46 100644
> --- a/include/uapi/linux/virtio_ring.h
> +++ b/include/uapi/linux/virtio_ring.h
> @@ -43,6 +43,8 @@
>   #define VRING_DESC_F_WRITE	2
>   /* This means the buffer contains a list of buffer descriptors. */
>   #define VRING_DESC_F_INDIRECT	4
> +#define VRING_DESC_F_AVAIL      7
> +#define VRING_DESC_F_USED	15

For consistency, you may want to make VRING_DESC_F_AVAIL and 
VRING_DESC_F_USED to represent the bit mask and not the bit position,
as done for VRING_DESC_F_WRITE and VRING_DESC_F_INDIRECT.

Regards,
Maxime