[dpdk-dev] [PATCH v3] net/virtio: fix wrong variable assignment in helper macro

[Vipul Ashri]

Hi All

I tried twice uploading this same patch but it is still not listed under http://patches.dpdk.org/project/dpdk/list/.
Please let me know if I am missing something and required to do some additional steps to submit my patch.

Thanks to Xia  for reviewing this code!

Regards
Vipul

-----Original Message-----
From: Xia, Chenbo [mailto:chenbo.xia at intel.com] 
Sent: Friday, 14 August, 2020 6:56
To: Vipul Ashri <vipul.ashri at oracle.com>; dev at dpdk.org
Cc: Edwin Leung <edwin.leung at oracle.com>; stable at dpdk.org; Wang, Zhihong <zhihong.wang at intel.com>; maxime.coquelin at redhat.com
Subject: RE: [PATCH v3] net/virtio: fix wrong variable assignment in helper macro


> -----Original Message-----
> From: Vipul Ashri <vipul.ashri at oracle.com>
> Sent: Friday, August 14, 2020 12:22 AM
> To: dev at dpdk.org
> Cc: Xia, Chenbo <chenbo.xia at intel.com>; vipul.ashri at oracle.com; 
> edwin.leung at oracle.com; stable at dpdk.org; Wang, Zhihong 
> <zhihong.wang at intel.com>; maxime.coquelin at redhat.com
> Subject: [PATCH v3] net/virtio: fix wrong variable assignment in 
> helper macro
> 
> Inside Macro ASSIGN_UNLESS_EQUAL(var, val), assignment to var is 
> always failing as assignment done using var_ having local scope only.
> This leads to TX packets not going out and found broken due to cleanup 
> malfunctioning. This patch fixes the wrong variable assignment.
> 
> Fixes: 57f90f894588 ("net/virtio: reuse packed ring functions")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Vipul Ashri <vipul.ashri at oracle.com>
> ---
>  drivers/net/virtio/virtqueue.h | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/virtio/virtqueue.h 
> b/drivers/net/virtio/virtqueue.h index 105a9c00c..20c95471e 100644
> --- a/drivers/net/virtio/virtqueue.h
> +++ b/drivers/net/virtio/virtqueue.h
> @@ -607,10 +607,8 @@ virtqueue_notify(struct virtqueue *vq)
> 
>  /* avoid write operation when necessary, to lessen cache issues */
>  #define ASSIGN_UNLESS_EQUAL(var, val) do {	\
> -	typeof(var) var_ = (var);		\
> -	typeof(val) val_ = (val);		\
> -	if ((var_) != (val_))			\
> -		(var_) = (val_);		\
> +	if ((var) != (val))			\
> +		(var) = (val);			\
>  } while (0)
> 
>  #define virtqueue_clear_net_hdr(hdr) do {		\
> --
> 2.28.0.windows.1

Reviewed-by: Chenbo Xia <chenbo.xia at intel.com>