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authorJay Cliburn <jacliburn@bellsouth.net>2007-07-20 01:45:12 +0200
committerJeff Garzik <jeff@garzik.org>2007-07-24 22:28:41 +0200
commit91a500ac5654766e4d9a6502dfcceb7e0a235f98 (patch)
treeacb41fc8f9f7406ccd12aef3f66518f106eda6fb /drivers/net/atl1
parentatl1: fix typo in DMA engine setup (diff)
downloadlinux-91a500ac5654766e4d9a6502dfcceb7e0a235f98.tar.xz
linux-91a500ac5654766e4d9a6502dfcceb7e0a235f98.zip
atl1: change cmb write threshold
Change the threshold number of descriptors used to trigger CMB writes. The vendor reports that under certain conditions this will reduce the number of unnecessary tx interrupts and improve rx performance. This change is lifted directly from vendor version 1.2.40.2 of the L1 driver. Signed-off-by: Jay Cliburn <jacliburn@bellsouth.net> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/net/atl1')
-rw-r--r--drivers/net/atl1/atl1_main.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/net/atl1/atl1_main.c b/drivers/net/atl1/atl1_main.c
index 3b8f633ec05e..6aa2dc32727e 100644
--- a/drivers/net/atl1/atl1_main.c
+++ b/drivers/net/atl1/atl1_main.c
@@ -917,7 +917,10 @@ static u32 atl1_configure(struct atl1_adapter *adapter)
iowrite32(value, hw->hw_addr + REG_DMA_CTRL);
/* config CMB / SMB */
- value = hw->cmb_rrd | ((u32) hw->cmb_tpd << 16);
+ value = (hw->cmb_tpd > adapter->tpd_ring.count) ?
+ hw->cmb_tpd : adapter->tpd_ring.count;
+ value <<= 16;
+ value |= hw->cmb_rrd;
iowrite32(value, hw->hw_addr + REG_CMB_WRITE_TH);
value = hw->cmb_rx_timer | ((u32) hw->cmb_tx_timer << 16);
iowrite32(value, hw->hw_addr + REG_CMB_WRITE_TIMER);