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, 11 insertions, 1 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 982ed44f0752..b6388be1cd1e 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -7857,7 +7857,10 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
         tw32(BUFMGR_DMA_HIGH_WATER,
              tp->bufmgr_config.dma_high_water);
 
-        tw32(BUFMGR_MODE, BUFMGR_MODE_ENABLE | BUFMGR_MODE_ATTN_ENABLE);
+        val = BUFMGR_MODE_ENABLE | BUFMGR_MODE_ATTN_ENABLE;
+        if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5719)
+                val |= BUFMGR_MODE_NO_TX_UNDERRUN;
+        tw32(BUFMGR_MODE, val);
         for (i = 0; i < 2000; i++) {
                 if (tr32(BUFMGR_MODE) & BUFMGR_MODE_ENABLE)
                         break;
@@ -8037,6 +8040,13 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
                      val | TG3_RDMA_RSRVCTRL_FIFO_OFLW_FIX);
         }
 
+        if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5719) {
+                val = tr32(TG3_LSO_RD_DMA_CRPTEN_CTRL);
+                tw32(TG3_LSO_RD_DMA_CRPTEN_CTRL, val |
+                     TG3_LSO_RD_DMA_CRPTEN_CTRL_BLEN_BD_4K |
+                     TG3_LSO_RD_DMA_CRPTEN_CTRL_BLEN_LSO_4K);
+        }
+
         /* Receive/send statistics. */
         if (tp->tg3_flags2 & TG3_FLG2_5750_PLUS) {
                 val = tr32(RCVLPC_STATS_ENABLE);