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Commit 788a035e authored by Matt Carlson's avatar Matt Carlson Committed by David S. Miller
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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: default avatarMatt Carlson <mcarlson@broadcom.com>
Reviewed-by: default avatarMichael Chan <mchan@broadcom.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a21771dd

drivers/net/tg3.c

+3 −0
Original line number Diff line number Diff line
@@ -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
Original line number Diff line number Diff line
@@ -1266,6 +1266,7 @@ 
#define  WDMAC_MODE_LNGREAD_ENAB	 0x00000200

#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