Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/netdev-2.6

* 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/netdev-2.6:
  [PATCH] sky2: fix jumbo packet support

1 files changed, 16 insertions, 3 deletions

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 60779eb..9591096 100644
--- 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);