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

[Vipul Ashri]

Hi All

This patch needs to get reviewed by all available reviewers as link came visible now.

@Xia Chenbo, As you have already reviewed so here I request you to share your review vote again and Ack if possible.

@Ferruh, Below link is correct patch, I appreciate and thank you very much for your help.

Patch Link:
https://urldefense.com/v3/__https://patches.dpdk.org/project/dpdk/list/?submitter=1867__;!!GqivPVa7Brio!JuQy9aSMyTDxpgEERG6JThvjCeZ0vbjYktEIDtU-JSHQalUpEoAp3u4diGxyy98kmw$


Regards
Vipul

-----Original Message-----
From: Ferruh Yigit [mailto:ferruh.yigit at intel.com] 
Sent: Wednesday, 19 August, 2020 0:15
To: Vipul Ashri <vipul.ashri at oracle.com>; Xia, Chenbo <chenbo.xia at intel.com>; dev at dpdk.org; stable at dpdk.org; Wang, Zhihong <zhihong.wang at intel.com>; maxime.coquelin at redhat.com
Cc: Edwin Leung <edwin.leung at oracle.com>
Subject: Re: [dpdk-dev] [PATCH v3] net/virtio: fix wrong variable assignment in helper macro

On 8/14/2020 6:23 AM, Vipul Ashri wrote:
> Hi All
> 
> I tried twice uploading this same patch but it is still not listed under https://urldefense.com/v3/__http://patches.dpdk.org/project/dpdk/list/__;!!GqivPVa7Brio!JuQy9aSMyTDxpgEERG6JThvjCeZ0vbjYktEIDtU-JSHQalUpEoAp3u4diGy8g7AhJA$ .
> Please let me know if I am missing something and required to do some additional steps to submit my patch.

Mail list is moderated, only subscribed members can post.
Your patches were hold in the administration queue because of that, I have released them and cleaned up the patchwork (since there were double of some
versions) and only left one copy of v3, please check if that is the correct one:
https://urldefense.com/v3/__https://patches.dpdk.org/project/dpdk/list/?submitter=1867__;!!GqivPVa7Brio!JuQy9aSMyTDxpgEERG6JThvjCeZ0vbjYktEIDtU-JSHQalUpEoAp3u4diGxyy98kmw$ 

> 
> 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>
>