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>

2 files changed, 5 insertions, 1 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 54dbe988f5f1..a43ef2b3a530 100644
--- 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
index 530c36b23e80..68431da5aad3 100644
--- 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