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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: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matt Carlson 2009-11-02 14:26:03 +00:00 committed by David S. Miller
parent a21771dd18
commit 788a035e60
2 changed files with 5 additions and 1 deletions
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3
drivers/net/tg3.c
View File

@ -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);

3
drivers/net/tg3.h
View File

@ -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