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authorSasha Neftin <sasha.neftin@intel.com>2017-08-06 16:49:18 +0300
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2017-10-10 19:00:38 +0300
commitb10effb92e272051dd1ec0d7be56bf9ca85ab927 (patch)
tree07e6a14dcaf54fa5a1b44103e28eeb0b41447229 /drivers
parent4aea7a5c5e940c1723add439f4088844cd26196d (diff)
downloadlinux-b10effb92e272051dd1ec0d7be56bf9ca85ab927.tar.xz
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/intel/e1000e/netdev.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index ee9de3500331..14b096f3d1da 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -3021,8 +3021,8 @@ static void e1000_configure_tx(struct e1000_adapter *adapter)
hw->mac.ops.config_collision_dist(hw);
- /* SPT and CNP Si errata workaround to avoid data corruption */
- if (hw->mac.type >= e1000_pch_spt) {
+ /* SPT and KBL Si errata workaround to avoid data corruption */
+ if (hw->mac.type == e1000_pch_spt) {
u32 reg_val;
reg_val = er32(IOSFPC);
@@ -3030,7 +3030,9 @@ static void e1000_configure_tx(struct e1000_adapter *adapter)
ew32(IOSFPC, reg_val);
reg_val = er32(TARC(0));
- reg_val |= E1000_TARC0_CB_MULTIQ_3_REQ;
+ /* SPT and KBL Si errata workaround to avoid Tx hang */
+ reg_val &= ~BIT(28);
+ reg_val |= BIT(29);
ew32(TARC(0), reg_val);
}
}