linux/drivers/net/e1000e
Bruce Allan c6e7f51e73 e1000e: workaround invalid Tx/Rx tail descriptor register write
When the Manageability Engine (ME) is enabled on 82579, it periodically
accesses some MAC CSR registers.  There is an arbiter in hardware which
prevents simultaneous access of these registers by the host software, i.e.
the driver.  There is a hardware bug in the aribter that signals a host
access of the registers later than it actually happens.  A write of the
Transmit or Receive Descriptor Tail register could result in an incorrect
value if the driver and ME perform simultaneous accesses which could result
in an access to an invalid memory address.  This would return an
Unsupported Request which could hang the hardware.  Workaround the issue by
checking the FWSM register bit24 which is set by ME before it accesses the
MAC CSR registers.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
2011-08-13 02:15:38 -07:00
..
82571.c e1000e: do not disable receiver on 82574/82583 2011-08-11 15:19:06 -07:00
defines.h e1000e: disable jumbo frames on 82579 when MACsec enabled in EEPROM 2011-03-11 02:23:21 -08:00
e1000.h e1000e: workaround invalid Tx/Rx tail descriptor register write 2011-08-13 02:15:38 -07:00
es2lan.c intel drivers: repair missing flush operations 2011-08-04 04:59:07 -07:00
ethtool.c e1000e: do not disable receiver on 82574/82583 2011-08-11 15:19:06 -07:00
hw.h e1000e: access multiple PHY registers on same page at the same time 2011-06-09 20:33:36 -07:00
ich8lan.c e1000e: workaround invalid Tx/Rx tail descriptor register write 2011-08-13 02:15:38 -07:00
lib.c e1000e: alternate MAC address update 2011-08-11 15:21:05 -07:00
Makefile e1000e: update Copyright for 2011 2011-01-14 02:04:01 -08:00
netdev.c e1000e: workaround invalid Tx/Rx tail descriptor register write 2011-08-13 02:15:38 -07:00
param.c e1000e: consistent use of Rx/Tx vs. RX/TX/rx/tx in comments/logs 2011-01-14 02:06:23 -08:00
phy.c intel drivers: repair missing flush operations 2011-08-04 04:59:07 -07:00