[PATCH] forcedeth config: statistics

[linux-2.6] / drivers / net / sky2.c

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 60779ebf2ff6a959c4cd9fa82429a2aca24aabb4..959109609d852bb47c2c0fd5f3ed04c693486c88 100644 (file)
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -979,6 +979,7 @@ static int sky2_rx_start(struct sky2_port *sky2)
        struct sky2_hw *hw = sky2->hw;
        unsigned rxq = rxqaddr[sky2->port];
        int i;
+       unsigned thresh;
 
        sky2->rx_put = sky2->rx_next = 0;
        sky2_qset(hw, rxq);
@@ -1003,9 +1004,21 @@ static int sky2_rx_start(struct sky2_port *sky2)
                sky2_rx_add(sky2, re->mapaddr);
        }
 
-       /* Truncate oversize frames */
-       sky2_write16(hw, SK_REG(sky2->port, RX_GMF_TR_THR), sky2->rx_bufsize - 8);
-       sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T), RX_TRUNC_ON);
+
+       /*
+        * The receiver hangs if it receives frames larger than the
+        * packet buffer. As a workaround, truncate oversize frames, but
+        * the register is limited to 9 bits, so if you do frames > 2052
+        * you better get the MTU right!
+        */
+       thresh = (sky2->rx_bufsize - 8) / sizeof(u32);
+       if (thresh > 0x1ff)
+               sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T), RX_TRUNC_OFF);
+       else {
+               sky2_write16(hw, SK_REG(sky2->port, RX_GMF_TR_THR), thresh);
+               sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T), RX_TRUNC_ON);
+       }
+
 
        /* Tell chip about available buffers */
        sky2_write16(hw, Y2_QADDR(rxq, PREF_UNIT_PUT_IDX), sky2->rx_put);