On Jun 7, 2012, at 11:24 AM, William Montgomery wrote:
> Can anyone recommend specific NIC manufacturer and model that works well with
> the current EtherCAT master?
>
> I have used the Intel PRO 1000 for a few years with good success but the
> driver doesnt work for me in recent kernels (2.6.37). I have seen other list
> traffic that indicates Realtek chipsets give good performance but my recent
> experience with Netgear GA311 (r8169) has lots of datagram UNMATCHED and
> datagram TIMEOUTS.
I was recently testing a new industrial SBC with Realtek 8111 NICs for a client
and discovered the same thing. The cause is a line that was must have been
inadvertently dropped in the merge-up from 2.6.33.
Here's the context diff for the patch:
*** r8169-2.6.37-ethercat.c 2012-01-10 05:03:51.000000000 -0500
--- r8169-2.6.37-ethercat-fixed.c 2012-06-07 13:17:55.018452791 -0400
***************
*** 4598,4603 ****
--- 4598,4604 ----
prefetch(data);
ecdev_receive(tp->ecdev, data, pkt_size);
dma_sync_single_for_device(d, addr, pkt_size,
DMA_FROM_DEVICE);
+ rtl8169_mark_to_asic(desc, rx_buf_sz);
} else {
skb =
rtl8169_try_rx_copy(tp->Rx_databuff[entry],
tp, pkt_size, addr);
Without that line, the HW is never told to advance to the next buffer
descriptor.
My apologies to the developers - I haven't had the opportunity to send this in
to the list yet.
Tom Nelson
Consulting Engineer
Granite Computer Sciences, LLC
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