DPDK Flow Filtering Not Working as Expected

[Medvedkin, Vladimir]

Hi all,

The goal that Ali is trying to achieve is not possible with the X540-AT2 
NIC (as with any other ixgbe NIC). The problem is related to:

1. The first rule is processed by the FDIR engine

2. FDIR engine is executed in the HW pipeline almost in the end (just 
before RSS), i.e. after other filters that we could use to match all 
other packets (5tuple filter engine in this particular case).

Therefore my recommendations here would be to use a modern NIC such as 
E810 to implement the required filtering logic.

On 04/02/2025 09:28, Dariusz Sosnowski wrote:
> Hi,
>
> Anatoly, Vladimir - Would you be able to help with the issue regarding DROP action not being supported on X540-AT2?
>
> Best regards,
> Dariusz Sosnowski
>
>> From: Sid ali cherrati <scherrati1 at gmail.com>
>> Sent: Monday, February 3, 2025 18:12
>> To: Dmitry Kozlyuk <dmitry.kozliuk at gmail.com>
>> Cc: users at dpdk.org
>> Subject: Re: DPDK Flow Filtering Not Working as Expected
>>
>> External email: Use caution opening links or attachments
>>
>> Here is a better version of the code :
>>
<snip>
>>
>> Le lun. 3 févr. 2025 à 16:00, Dmitry Kozlyuk <mailto:dmitry.kozliuk at gmail.com> a écrit :
>> 2025-02-03 14:51 (UTC+0100), Sid ali cherrati:
>>> [...]
>>> if (!rte_flow_validate(port_id, &attr, pattern, actions, &error)){
>>> flow = rte_flow_create(port_id, &attr, pattern, actions, &error);
>>> }
>>>
>>> if(flow != 0){
>>> printf("Filed to create drop flow filter \n");
>>> return -1;
>>> }
>>> [...]
>>> The issue is that when I implement this, I get an error on the drop filter:
>>> "Failed to create rule." Do you have any idea why this might be happening?
>> There is no this exact error text in your code or DPDK,
>> I assume we're talking about the quoted fragment.
>> `flow` is a pointer, the correct error condition is `if (flow == NULL)`,
>> so your code probably misinterprets success as error.
>> Also `flow` is not assigned if `rte_flow_validate()` returns non-0.

-- 
Regards,
Vladimir