[dpdk-dev,v2] net/i40e: fix division by 0 error
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Commit Message
In function i40e_vsi_config_tc_queue_mapping(), if 'enabled_tcmap' is
0, 'total_tc' might be 0. Then 'total_tc' might be used in a division
by 0 in "qpnum_per_tc = i40e_align_floor(vsi->nb_qps / total_tc)". Fix
it by changing 'total_tc' from 0 to 1 just as func
i40e_vsi_update_queue_mapping() does.
Signed-off-by: Yong Wang <wang.yong19@zte.com.cn>
---
drivers/net/i40e/i40e_ethdev.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
Comments
> -----Original Message-----
> From: Yong Wang [mailto:wang.yong19@zte.com.cn]
> Sent: Friday, June 23, 2017 6:58 PM
> To: Wu, Jingjing <jingjing.wu@intel.com>
> Cc: dev@dpdk.org; Yong Wang <wang.yong19@zte.com.cn>
> Subject: [PATCH v2] net/i40e: fix division by 0 error
>
> In function i40e_vsi_config_tc_queue_mapping(), if 'enabled_tcmap' is 0,
> 'total_tc' might be 0. Then 'total_tc' might be used in a division by 0 in
> "qpnum_per_tc = i40e_align_floor(vsi->nb_qps / total_tc)". Fix it by changing
> 'total_tc' from 0 to 1 just as func
> i40e_vsi_update_queue_mapping() does.
>
> Signed-off-by: Yong Wang <wang.yong19@zte.com.cn>
Acked-by: Jingjing Wu <jingjing.wu@intel.com>
On 6/29/2017 6:18 AM, Wu, Jingjing wrote:
>
>
>> -----Original Message-----
>> From: Yong Wang [mailto:wang.yong19@zte.com.cn]
>> Sent: Friday, June 23, 2017 6:58 PM
>> To: Wu, Jingjing <jingjing.wu@intel.com>
>> Cc: dev@dpdk.org; Yong Wang <wang.yong19@zte.com.cn>
>> Subject: [PATCH v2] net/i40e: fix division by 0 error
>>
>> In function i40e_vsi_config_tc_queue_mapping(), if 'enabled_tcmap' is 0,
>> 'total_tc' might be 0. Then 'total_tc' might be used in a division by 0 in
>> "qpnum_per_tc = i40e_align_floor(vsi->nb_qps / total_tc)". Fix it by changing
>> 'total_tc' from 0 to 1 just as func
>> i40e_vsi_update_queue_mapping() does.
>>
>> Signed-off-by: Yong Wang <wang.yong19@zte.com.cn>
>
>
> Acked-by: Jingjing Wu <jingjing.wu@intel.com>
>
Fixes: 4861cde46116 ("i40e: new poll mode driver")
Applied to dpdk-next-net/master, thanks.
(Adding braces to for loop not required and not related the patch,
removed from patch)
@@ -4281,9 +4281,12 @@ enum i40e_status_code
if (ret != I40E_SUCCESS)
return ret;
- for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++)
+ for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++) {
if (enabled_tcmap & (1 << i))
total_tc++;
+ }
+ if (total_tc == 0)
+ total_tc = 1;
vsi->enabled_tc = enabled_tcmap;
/* Number of queues per enabled TC */