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igb: correctly offset 82575 flow control watermarks by 16 bytes 

The watermark values for the 82575 were not being set correctly.  As a
result the high and low watermark values were set to the same value which
can lead to excess xon/xoff packets being generated.

Signed-off-by: Alexander Duyck <alexander.h.duyck@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:
Alexander Duyck 2009-12-23 13:21:27 +00:00 committed by David S. Miller
parent 8c6af2995c
commit d405ea3ef2
1 changed files with 2 additions and 7 deletions
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9
drivers/net/igb/igb_main.c
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@ -1306,13 +1306,8 @@ void igb_reset(struct igb_adapter *adapter)
hwm = min(((pba << 10) * 9 / 10),
((pba << 10) - 2 * adapter->max_frame_size));
if (mac->type < e1000_82576) {
fc->high_water = hwm & 0xFFF8; /* 8-byte granularity */
fc->low_water = fc->high_water - 8;
} else {
fc->high_water = hwm & 0xFFF0; /* 16-byte granularity */
fc->low_water = fc->high_water - 16;
}
fc->high_water = hwm & 0xFFF0; /* 16-byte granularity */
fc->low_water = fc->high_water - 16;
fc->pause_time = 0xFFFF;
fc->send_xon = 1;
fc->current_mode = fc->requested_mode;