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-rw-r--r--drivers/net/e1000e/e1000.h2
-rw-r--r--drivers/net/e1000e/ich8lan.c1
-rw-r--r--drivers/net/e1000e/netdev.c41
3 files changed, 32 insertions, 12 deletions
diff --git a/drivers/net/e1000e/e1000.h b/drivers/net/e1000e/e1000.h
index 189dfa2d6c76..3e187b0e4203 100644
--- a/drivers/net/e1000e/e1000.h
+++ b/drivers/net/e1000e/e1000.h
@@ -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
diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c
index 51ddb04ab195..92cf10333654 100644
--- a/drivers/net/e1000e/ich8lan.c
+++ b/drivers/net/e1000e/ich8lan.c
@@ -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,
diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 0687c6aa4e46..a1a5a6f15a65 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -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 */
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