[LEDE-DEV] Transmit timeouts with mtk_eth_soc and MT7621

[Mingyu Li]

i guess more other interrupts maybe cause the problem. because the
ethernet receive flow is interrupt by other hardware. so use sd card,
wifi or usb can generate interrupts.

2017-07-24 17:19 GMT+08:00 Kristian Evensen <kristian.evensen at gmail.com>:
> Hi,
>
> On Mon, Jul 24, 2017 at 4:02 AM, Mingyu Li <igvtee at gmail.com> wrote:
>> i guest the problem is there are some tx data not free. but tx
>> interrupt is clean. cause tx timeout. the old code will free data
>> first then clean interrupt. but there maybe new data arrive after free
>> data before clean interrupt.
>> so change it to clean interrupt first then clean all tx data( also
>> remove the budget limit). if new tx data arrive. hardware will set tx
>> interrupt flag. then we will free it next time.
>> i also apply this to rx flow.
>
> Thanks for the detailed explanation. I have deployed an image with the
> patch to some of the routers showing this issue, so lets wait and see.
> Of course, all routers have been stable for the last couple of days
> (including before the weekend) now, so I will let them run for a week
> or so and then report back.
>
> In order to ease testing and make it more controlled, do you have any
> suggestions for how to trigger the error? Is it "just" a timing issue
> or should I be able to trigger it with for example a specific traffic
> pattern?
>
> -Kristian