Hi All,
There seems to be a bug in the function eth_poll() in this driver
When the RX ring gets full once, the re-schedule is called forever, even
when the ring is empty afterwards.
if (!received) {
napi_complete(napi);
enable_irq(sw->rx_irq);
budget = 0;
/* if rx descriptors are full schedule another poll */
if (rx_ring->desc[(i-1) & (RX_DESCS-1)].cown)
{
eth_schedule_poll(sw); <---- Gets called on each
function entry
}
}
This causes SoftIRQ to fully load a core forever.
I didn't fix it yet, but should I be the first, i'll supply a patch ..
Used hardware:
- Gateworks Laguna GW2388-4
Seen on branches:
- Lede master (4.4.13 kernel)
- Gateworks 16.02 (4.4.0 kernel)
Reproducing (100%):
- Iperf to an external server (Issue not seen - cpu is fast enough to
avoid the RX ring from reaching 'Full')
- Route an iperf stream from a second device via wlan through eth to an
external server (RX ring gets full after a minute .. spinlock loop
forever occurs)
Kind Regards,
Koen Vandeputte
nCentric Europe
_______________________________________________
Lede-dev mailing list
Lede-dev@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/lede-dev
