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e1000e: Expand workaround for 10Mb HD throughput bug

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In commit 772d05c51c "e1000e: slow performance
between two 82579 connected via 10Mbit hub", a workaround was put into place
to address the overaggressive transmit behavior of 82579 parts when connecting
at 10Mbs half-duplex.

This same behavior is seen on i217 and i218 parts as well.  This patch expands
the original workaround to encompass these parts.

Signed-off-by: Dave Ertman <davidx.m.ertman@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
David Ertman 2014-04-22 05:48:54 +00:00 committed by Jeff Kirsher
parent 77e61146c6
commit fbb9ab10a2
2 changed files with 12 additions and 4 deletions
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15
drivers/net/ethernet/intel/e1000e/ich8lan.c
View File

@ -1314,14 +1314,17 @@ static s32 e1000_check_for_copper_link_ich8lan(struct e1000_hw *hw)
return ret_val;
}
/* When connected at 10Mbps half-duplex, 82579 parts are excessively
/* When connected at 10Mbps half-duplex, some parts are excessively
* aggressive resulting in many collisions. To avoid this, increase
* the IPG and reduce Rx latency in the PHY.
*/
if ((hw->mac.type == e1000_pch2lan) && link) {
if (((hw->mac.type == e1000_pch2lan) ||
(hw->mac.type == e1000_pch_lpt)) && link) {
u32 reg;
reg = er32(STATUS);
if (!(reg & (E1000_STATUS_FD | E1000_STATUS_SPEED_MASK))) {
u16 emi_addr;
reg = er32(TIPG);
reg &= ~E1000_TIPG_IPGT_MASK;
reg |= 0xFF;
@ -1332,8 +1335,12 @@ static s32 e1000_check_for_copper_link_ich8lan(struct e1000_hw *hw)
if (ret_val)
return ret_val;
ret_val =
e1000_write_emi_reg_locked(hw, I82579_RX_CONFIG, 0);
if (hw->mac.type == e1000_pch2lan)
emi_addr = I82579_RX_CONFIG;
else
emi_addr = I217_RX_CONFIG;
ret_val = e1000_write_emi_reg_locked(hw, emi_addr, 0);
hw->phy.ops.release(hw);

1
drivers/net/ethernet/intel/e1000e/ich8lan.h
View File

@ -242,6 +242,7 @@
#define I217_EEE_CAPABILITY 0x8000 /* IEEE MMD Register 3.20 */
#define I217_EEE_ADVERTISEMENT 0x8001 /* IEEE MMD Register 7.60 */
#define I217_EEE_LP_ABILITY 0x8002 /* IEEE MMD Register 7.61 */
#define I217_RX_CONFIG 0xB20C /* Receive configuration */
#define E1000_EEE_RX_LPI_RCVD 0x0400 /* Tx LP idle received */
#define E1000_EEE_TX_LPI_RCVD 0x0800 /* Rx LP idle received */