freebsd-skq/sys/dev/re
yongari 428ebfa96c Disable accepting frames in re_stop() to put RX MAC into idle state.
Because there is no reliable way to know whether RX MAC is in
stopped state, rejecting all frames would be the only way to
minimize possible races.
Otherwise it's possible to receive frames while stop command
execution is in progress and controller can DMA the frame to freed
RX buffer during that period.
This was observed on recent PCIe controllers(i.e. RTL8111F).

While this change may not be required on old controllers it
wouldn't make negative effects on old controllers.  One side effect
of this change is disabling receive so driver reprograms RL_RXCFG
to receive WOL frames when it is put into suspend or shutdown.

This should address occasional 'memory modified free' errors seen
on recent RealTek controllers.
2011-11-23 02:08:05 +00:00
..
if_re.c Disable accepting frames in re_stop() to put RX MAC into idle state. 2011-11-23 02:08:05 +00:00