tg3: 5719: Prevent tx data corruption

This patch enables a bit that prevents read DMA overflows and adjusts
the txmbuf margin from the hardware default.  The combination of these
modifications prevents a tx data corruption issue we were seeing on the
5719.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index 44733e4a68a2..ec62f057ff6d 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -1225,6 +1225,7 @@
 #define  BUFMGR_MODE_ATTN_ENABLE         0x00000004
 #define  BUFMGR_MODE_BM_TEST             0x00000008
 #define  BUFMGR_MODE_MBLOW_ATTN_ENAB     0x00000010
+#define  BUFMGR_MODE_NO_TX_UNDERRUN      0x80000000
 #define BUFMGR_STATUS                   0x00004404
 #define  BUFMGR_STATUS_ERROR             0x00000004
 #define  BUFMGR_STATUS_MBLOW             0x00000010
@@ -1306,7 +1307,12 @@
 
 #define TG3_RDMA_RSRVCTRL_REG           0x00004900
 #define TG3_RDMA_RSRVCTRL_FIFO_OFLW_FIX  0x00000004
-/* 0x4904 --> 0x4c00 unused */
+/* 0x4904 --> 0x4910 unused */
+
+#define TG3_LSO_RD_DMA_CRPTEN_CTRL      0x00004910
+#define TG3_LSO_RD_DMA_CRPTEN_CTRL_BLEN_BD_4K    0x00030000
+#define TG3_LSO_RD_DMA_CRPTEN_CTRL_BLEN_LSO_4K   0x000c0000
+/* 0x4914 --> 0x4c00 unused */
 
 /* Write DMA control registers */
 #define WDMAC_MODE                      0x00004c00