[PATCH 0/3] pch_gbe: fix CRC errors and improve speed

[Veaceslav Falico <vfalico@redhat.com>]

This patch series tries to get rid of CRC errors and other instability
caused by wrong RX_FIFO overrun processing. It also cleans the code a bit.

Now (without the patch applied) on high number of incoming packets and/or
stressed system pch_gbe driver reports CRC errors and huge numbers of
RX_FIFO_ERR (overruns). It also sometimes just freezes (caused by not
waiting enough on DMA_RX to stop before issuing a reset on MAC_RX logic).

This patchset removes the unneeded (as per datasheet) MAC_RX reset and
corrects the processing of RX_FIFO_ERR in pch_gbe_napi_poll().

With the patchset applied there are no more CRC errors, sane number of
RX_FIFO_ERR and improved speed/stability. The patchset was tested on
Informix SYS940X and Kontron Tunnel Creek EG20T on 1gbps direct-connected
link and different rx/tx descriptors count.

 .../net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c   |   99 +++++--------------
 1 files changed, 26 insertions(+), 73 deletions(-)