]> git.baikalelectronics.ru Git - kernel.git/commit
e1000e: fix buffer overrun while the I219 is processing DMA transactions
authorSasha Neftin <sasha.neftin@intel.com>
Sun, 6 Aug 2017 13:49:18 +0000 (16:49 +0300)
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>
Tue, 10 Oct 2017 16:00:38 +0000 (09:00 -0700)
commitf9ea1821f5e25bda68e92a6163042e54dd75c32d
tree07e6a14dcaf54fa5a1b44103e28eeb0b41447229
parent824544d0a38a6d38f6339856e368c8c081c10320
e1000e: fix buffer overrun while the I219 is processing DMA transactions

IntelĀ® 100/200 Series Chipset platforms reduced the round-trip
latency for the LAN Controller DMA accesses, causing in some high
performance cases a buffer overrun while the I219 LAN Connected
Device is processing the DMA transactions. I219LM and I219V devices
can fall into unrecovered Tx hang under very stressfully UDP traffic
and multiple reconnection of Ethernet cable. This Tx hang of the LAN
Controller is only recovered if the system is rebooted. Slightly slow
down DMA access by reducing the number of outstanding requests.
This workaround could have an impact on TCP traffic performance
on the platform. Disabling TSO eliminates performance loss for TCP
traffic without a noticeable impact on CPU performance.

Please, refer to I218/I219 specification update:
https://www.intel.com/content/www/us/en/embedded/products/networking/
ethernet-connection-i218-family-documentation.html

Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Reviewed-by: Dima Ruinskiy <dima.ruinskiy@intel.com>
Reviewed-by: Raanan Avargil <raanan.avargil@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
drivers/net/ethernet/intel/e1000e/netdev.c