netdev - Re: [PATCH net 2/2] net/sched: cls_flower: Use masked key when calling HW offloads

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Date:   Thu, 15 Dec 2016 15:59:31 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Simon Horman <simon.horman@...ronome.com>
Cc:     Paul Blakey <paulb@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Jiri Pirko <jiri@...lanox.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Roi Dayan <roid@...lanox.com>,
        Shahar Klein <shahark@...lanox.com>,
        Hadar Hen Zion <hadarh@...lanox.com>
Subject: Re: [PATCH net 2/2] net/sched: cls_flower: Use masked key when
 calling HW offloads

Thu, Dec 15, 2016 at 02:50:44PM CET, simon.horman@...ronome.com wrote:
>Hi Paul,
>
>On Wed, Dec 14, 2016 at 07:00:58PM +0200, Paul Blakey wrote:
>> Zero bits on the mask signify a "don't care" on the corresponding bits
>> in key. Some HWs require those bits on the key to be zero. Since these
>> bits are masked anyway, it's okay to provide the masked key to all
>> drivers.
>> 
>> Fixes: 5b33f48842fa ('net/flower: Introduce hardware offload support')
>> Signed-off-by: Paul Blakey <paulb@...lanox.com>
>> Reviewed-by: Roi Dayan <roid@...lanox.com>
>> Acked-by: Jiri Pirko <jiri@...lanox.com>
>
>While I don't have a specific use case in mind that this change would break
>it seems to me that it would be better to handle hardware requirements
>at the driver level.

Even though, makes no sense to pass unmasked key down. Is is only
confusing. This patch fixes it.


>
>> ---
>>  net/sched/cls_flower.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
>> index 9758f5a..35ac28d 100644
>> --- a/net/sched/cls_flower.c
>> +++ b/net/sched/cls_flower.c
>> @@ -252,7 +252,7 @@ static int fl_hw_replace_filter(struct tcf_proto *tp,
>>  	offload.cookie = (unsigned long)f;
>>  	offload.dissector = dissector;
>>  	offload.mask = mask;
>> -	offload.key = &f->key;
>> +	offload.key = &f->mkey;
>>  	offload.exts = &f->exts;
>>  
>>  	tc->type = TC_SETUP_CLSFLOWER;
>> -- 
>> 1.8.3.1
>>