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tg3: Improve 5785 PCIe performance

PATCH In review Matt Carlson 1 participant 1 message Nov 3, 2009

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Matt Carlson

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PATCH 7/20 tg3: Improve 5785 PCIe performance

This patch improves 5785 performance by allowing the write DMA engine to request larger DMA burst sizes than it otherwise would.

Signed-off-by Matt Carlson <[email protected]>
Reviewed-by Michael Chan <[email protected]>
---
 drivers/net/tg3.c |    3 +++
 drivers/net/tg3.h |    3 ++-
 2 files changed, 5 insertions(+), 1 deletions(-)
drivers/net/tg3.c +3 -0
index 54dbe98..a43ef2b 100644
@@ -7633,6 +7633,9 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
 	if (tp->tg3_flags3 & TG3_FLG3_5755_PLUS)
 		val |= WDMAC_MODE_STATUS_TAG_FIX;
 
+	if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5785)
+		val |= WDMAC_MODE_BURST_ALL_DATA;
+
 	tw32_f(WDMAC_MODE, val);
 	udelay(40);
drivers/net/tg3.h +2 -1
index 530c36b..68431da 100644
@@ -1264,8 +1264,9 @@
 #define  WDMAC_MODE_FIFOURUN_ENAB	 0x00000080
 #define  WDMAC_MODE_FIFOOREAD_ENAB	 0x00000100
 #define  WDMAC_MODE_LNGREAD_ENAB	 0x00000200
-#define  WDMAC_MODE_RX_ACCEL	 	 0x00000400
+#define  WDMAC_MODE_RX_ACCEL		 0x00000400
 #define  WDMAC_MODE_STATUS_TAG_FIX	 0x20000000
+#define  WDMAC_MODE_BURST_ALL_DATA	 0xc0000000
 #define WDMAC_STATUS			0x00004c04
 #define  WDMAC_STATUS_TGTABORT		 0x00000004
 #define  WDMAC_STATUS_MSTABORT		 0x00000008
Signature · 1 line
1.6.4.4