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e1000e: partial revert of 3ec2a2b8 plus FC workraround for 82577/8 

Commit 3ec2a2b80f broke Tx/Rx when using
jumbo frames on certain parts (i.e. only PAUSE frames could be exchanged
once the high water mark was reached preventing normal packet traffic).
This patch reverts the breakage and sets appropriate high and low water
marks of the Rx FIFO for 82577/82578 which require a workaround due to a
flow control issue in hardware.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bruce Allan 2009-11-19 12:34:20 +00:00 committed by David S. Miller
parent 30b768323f
commit 38eb394e33
3 changed files with 32 additions and 12 deletions
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2
drivers/net/e1000e/e1000.h
View File

@ -141,6 +141,8 @@ struct e1000_info;
#define HV_TNCRS_UPPER PHY_REG(778, 29) /* Transmit with no CRS */
#define HV_TNCRS_LOWER PHY_REG(778, 30)
#define E1000_FCRTV_PCH 0x05F40 /* PCH Flow Control Refresh Timer Value */
/* BM PHY Copper Specific Status */
#define BM_CS_STATUS 17
#define BM_CS_STATUS_LINK_UP 0x0400

1
drivers/net/e1000e/ich8lan.c
View File

@ -3558,6 +3558,7 @@ struct e1000_info e1000_pch_info = {
| FLAG_HAS_AMT
| FLAG_HAS_FLASH
| FLAG_HAS_JUMBO_FRAMES
| FLAG_DISABLE_FC_PAUSE_TIME /* errata */
| FLAG_APME_IN_WUC,
.pba = 26,
.max_hw_frame_size = 4096,

41
drivers/net/e1000e/netdev.c
View File

@ -2769,25 +2769,38 @@ void e1000e_reset(struct e1000_adapter *adapter)
/*
* flow control settings
*
* The high water mark must be low enough to fit two full frame
* The high water mark must be low enough to fit one full frame
* (or the size used for early receive) above it in the Rx FIFO.
* Set it to the lower of:
* - 90% of the Rx FIFO size, and
* - the full Rx FIFO size minus the early receive size (for parts
* with ERT support assuming ERT set to E1000_ERT_2048), or
* - the full Rx FIFO size minus two full frames
* - the full Rx FIFO size minus one full frame
*/
if ((adapter->flags & FLAG_HAS_ERT) &&
(adapter->netdev->mtu > ETH_DATA_LEN))
hwm = min(((pba << 10) * 9 / 10),
((pba << 10) - (E1000_ERT_2048 << 3)));
else
hwm = min(((pba << 10) * 9 / 10),
((pba << 10) - (2 * adapter->max_frame_size)));
if (hw->mac.type == e1000_pchlan) {
/*
* Workaround PCH LOM adapter hangs with certain network
* loads. If hangs persist, try disabling Tx flow control.
*/
if (adapter->netdev->mtu > ETH_DATA_LEN) {
fc->high_water = 0x3500;
fc->low_water = 0x1500;
} else {
fc->high_water = 0x5000;
fc->low_water = 0x3000;
}
} else {
if ((adapter->flags & FLAG_HAS_ERT) &&
(adapter->netdev->mtu > ETH_DATA_LEN))
hwm = min(((pba << 10) * 9 / 10),
((pba << 10) - (E1000_ERT_2048 << 3)));
else
hwm = min(((pba << 10) * 9 / 10),
((pba << 10) - adapter->max_frame_size));
fc->high_water = hwm & E1000_FCRTH_RTH; /* 8-byte granularity */
fc->low_water = (fc->high_water - (2 * adapter->max_frame_size));
fc->low_water &= E1000_FCRTL_RTL; /* 8-byte granularity */
fc->high_water = hwm & E1000_FCRTH_RTH; /* 8-byte granularity */
fc->low_water = fc->high_water - 8;
}
if (adapter->flags & FLAG_DISABLE_FC_PAUSE_TIME)
fc->pause_time = 0xFFFF;
@ -2813,6 +2826,10 @@ void e1000e_reset(struct e1000_adapter *adapter)
if (mac->ops.init_hw(hw))
e_err("Hardware Error\n");
/* additional part of the flow-control workaround above */
if (hw->mac.type == e1000_pchlan)
ew32(FCRTV_PCH, 0x1000);
e1000_update_mng_vlan(adapter);
/* Enable h/w to recognize an 802.1Q VLAN Ethernet packet */