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 <mcarlson@broadcom.com> Reviewed-by: Michael Chan <mchan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
git-mirror · Nov 3, 2009 · 788a035 · 788a035
1 parent a21771d
commit 788a035
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Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
@@ -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);
 

diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
@@ -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