sky2: EC-U performance and jumbo support

The Yukon EC Ultra chips have transmit settings for store and
forward and PCI buffering. By setting these appropriately, normal
performance goes from 750Mbytes/sec to 940Mbytes/sec (non-jumbo).

It is also possible to do Jumbo mode, but it means turning off
TSO and checksum offload so the performance gets worse. There isn't
enough buffering for checksum offload to work.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/sky2.h b/drivers/net/sky2.h
index 9ca4a2c061c6..5efb5afc45ba 100644
--- a/drivers/net/sky2.h
+++ b/drivers/net/sky2.h
@@ -741,6 +741,11 @@ enum {
         TX_GMF_RP       = 0x0d70,/* 32 bit      Tx GMAC FIFO Read Pointer */
         TX_GMF_RSTP     = 0x0d74,/* 32 bit      Tx GMAC FIFO Restart Pointer */
         TX_GMF_RLEV     = 0x0d78,/* 32 bit      Tx GMAC FIFO Read Level */
+
+        /* Threshold values for Yukon-EC Ultra and Extreme */
+        ECU_AE_THR      = 0x0070, /* Almost Empty Threshold */
+        ECU_TXFF_LEV    = 0x01a0, /* Tx BMU FIFO Level */
+        ECU_JUMBO_WM    = 0x0080, /* Jumbo Mode Watermark */
 };
 
 /* Descriptor Poll Timer Registers */
@@ -1634,6 +1639,9 @@ enum {
         TX_VLAN_TAG_ON  = 1<<25,/* enable  VLAN tagging */
         TX_VLAN_TAG_OFF = 1<<24,/* disable VLAN tagging */
 
+        TX_JUMBO_ENA    = 1<<23,/* PCI Jumbo Mode enable (Yukon-EC Ultra) */
+        TX_JUMBO_DIS    = 1<<22,/* PCI Jumbo Mode enable (Yukon-EC Ultra) */
+
         GMF_WSP_TST_ON  = 1<<18,/* Write Shadow Pointer Test On */
         GMF_WSP_TST_OFF = 1<<17,/* Write Shadow Pointer Test Off */
         GMF_WSP_STEP    = 1<<16,/* Write Shadow Pointer Step/Increment */