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e1000: fix flow control thresholds

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when testing the jumbo frames with pages patch, the stats would
show rx_missed errors (dropped packets) even when connected to a
link partner with flow control enabled.

this indicates that for this MTU (9000) the flow control
thresholds are not adjusting correctly.

In fact, before this change, the FCRTH (xoff threshold) is 36864
when the fifo size is only 40000, with 9000 byte MTU.

fix it so that we at least have room for one frame after we send
the xoff.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@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:
Jesse Brandeburg
2009-07-06 10:45:01 +00:00
committed by David S. Miller
parent edbbb3ca10
commit b7cb8c2c82
3 changed files with 32 additions and 29 deletions
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2
drivers/net/e1000/e1000_hw.c
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@@ -1955,7 +1955,7 @@ static s32 e1000_setup_copper_link(struct e1000_hw *hw)
s32 ret_val;
u16 i;
u16 phy_data;
u16 reg_data;
u16 reg_data = 0;
DEBUGFUNC("e1000_setup_copper_link");