linux-kernel - Re: [PATCH v6 30/46] vhost/net: force len for TX to host endian

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Message-Id: <1417163803.5822.9@smtp.corp.redhat.com>
Date:	Fri, 28 Nov 2014 08:44:43 +0008
From:	Jason Wang <jasowang@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	cornelia.huck@...ibm.com, rusty@....ibm.com, nab@...ux-iscsi.org,
	pbonzini@...hat.com, thuth@...ux.vnet.ibm.com,
	dahi@...ux.vnet.ibm.com, kvm@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH v6 30/46] vhost/net: force len for TX to host endian



On Fri, Nov 28, 2014 at 4:10 AM, Michael S. Tsirkin <mst@...hat.com> 
wrote:
> vhost/net keeps a copy of some used ring but (ab)uses length
> field for internal house-keeping. This works because
> for tx used length is always 0.
> Suppress sparse errors: we use native endian-ness internally but never
> expose it to guest.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  drivers/vhost/net.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
> index 8dae2f7..dce5c58 100644
> --- a/drivers/vhost/net.c
> +++ b/drivers/vhost/net.c
> @@ -48,15 +48,15 @@ MODULE_PARM_DESC(experimental_zcopytx, "Enable 
> Zero Copy TX;"
>   * status internally; used for zerocopy tx only.
>   */
>  /* Lower device DMA failed */
> -#define VHOST_DMA_FAILED_LEN	3
> +#define VHOST_DMA_FAILED_LEN	((__force __virtio32)3)
>  /* Lower device DMA done */
> -#define VHOST_DMA_DONE_LEN	2
> +#define VHOST_DMA_DONE_LEN	((__force __virtio32)2)
>  /* Lower device DMA in progress */
> -#define VHOST_DMA_IN_PROGRESS	1
> +#define VHOST_DMA_IN_PROGRESS	((__force __virtio32)1)
>  /* Buffer unused */
> -#define VHOST_DMA_CLEAR_LEN	0
> +#define VHOST_DMA_CLEAR_LEN	((__force __virtio32)0)
>  
> -#define VHOST_DMA_IS_DONE(len) ((len) >= VHOST_DMA_DONE_LEN)
> +#define VHOST_DMA_IS_DONE(len) ((__force u32)(len) >= (__force 
> u32)VHOST_DMA_DONE_LEN)
>  
>  enum {
>  	VHOST_NET_FEATURES = VHOST_FEATURES |
> -- 
> MST

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

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