On 2025/5/13 14:13, Jason Xing wrote:
> On Tue, May 13, 2025 at 12:08 PM Haifeng Xu <[email protected]> wrote:
>>
>> Hi all,
>>
>> If the packets arrive at the rx and then raise soft irq to handle
>> it, but in i40e_clean_rx_irq, status_error_len is 0 and return.
>
> Directly "return"? What version of I40E are you looking at?
stable kenrel 5.15.162,
i40e_clean_rx_irq
...
qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
...
size = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >>
I40E_RXD_QW1_LENGTH_PBUF_SHIFT;
if (!size)
break;
...
if status_error_len is 0, the i40e_clean_rx_irq returns 0.
>
>> The data isn't fetchted from the rx buffer, so the how the packets
>> arrive at the rx will be processed?
>
> In i40e_clean_rx_irq(), packets are one by one constructed into the
> sk_buff and then passed to the stack by napi_gro_receive().
>
> AFAIK, common drivers implement nearly the same scenario.
>
>
> Thanks,
> Jason
>
>
>>
>> FYI, the every rx/tx queue has been bounded to one cpu(64 queues, 64
>> cpus).
>>
>> Thanks!
>>
