Commit d405ea3e authored Dec 23, 2009 by Alexander Duyck Committed by David S. Miller Dec 23, 2009

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>

parent 8c6af299

drivers/net/igb/igb_main.c

+2 −7

Original line number	Diff line number	Diff line
		@@ -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->pause_time = 0xFFFF;
		fc->send_xon = 1;
		fc->current_mode = fc->requested_mode;