netdev - [PATCH 2/2] skge: MTU changing fix

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Message-ID: <20071128142505.2018aa73@freepuppy.rosehill>
Date:	Wed, 28 Nov 2007 14:25:05 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Jeff Garzik <jgarzik@...ox.com>
Cc:	netdev@...r.kernel.org
Subject: [PATCH 2/2] skge: MTU changing fix

The code to change MTU doesn't correctly handle all the chip variations
and requirements for restarting.  On Genesis chips changing MTU would just
cause receiver to hang.
Use a simpler approach of just taking link down/up if needed.

Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>
---

Please apply to 2.6.24 (upstream-fixes).

--- a/drivers/net/skge.c	2007-11-28 11:49:15.000000000 -0800
+++ b/drivers/net/skge.c	2007-11-28 11:49:48.000000000 -0800
@@ -2896,11 +2896,7 @@ static void skge_tx_timeout(struct net_d
 
 static int skge_change_mtu(struct net_device *dev, int new_mtu)
 {
-	struct skge_port *skge = netdev_priv(dev);
-	struct skge_hw *hw = skge->hw;
-	int port = skge->port;
 	int err;
-	u16 ctl, reg;
 
 	if (new_mtu < ETH_ZLEN || new_mtu > ETH_JUMBO_MTU)
 		return -EINVAL;
@@ -2910,40 +2906,13 @@ static int skge_change_mtu(struct net_de
 		return 0;
 	}
 
-	skge_write32(hw, B0_IMSK, 0);
-	dev->trans_start = jiffies;	/* prevent tx timeout */
-	netif_stop_queue(dev);
-	napi_disable(&skge->napi);
-
-	ctl = gma_read16(hw, port, GM_GP_CTRL);
-	gma_write16(hw, port, GM_GP_CTRL, ctl & ~GM_GPCR_RX_ENA);
-
-	skge_rx_clean(skge);
-	skge_rx_stop(hw, port);
+	skge_down(dev);
 
 	dev->mtu = new_mtu;
 
-	reg = GM_SMOD_VLAN_ENA | IPG_DATA_VAL(IPG_DATA_DEF);
-	if (new_mtu > 1500)
-		reg |= GM_SMOD_JUMBO_ENA;
-	gma_write16(hw, port, GM_SERIAL_MODE, reg);
-
-	skge_write8(hw, RB_ADDR(rxqaddr[port], RB_CTRL), RB_ENA_OP_MD);
-
-	err = skge_rx_fill(dev);
-	wmb();
-	if (!err)
-		skge_write8(hw, Q_ADDR(rxqaddr[port], Q_CSR), CSR_START | CSR_IRQ_CL_F);
-	skge_write32(hw, B0_IMSK, hw->intr_mask);
-
+	err = skge_up(dev);
 	if (err)
 		dev_close(dev);
-	else {
-		gma_write16(hw, port, GM_GP_CTRL, ctl);
-
-		napi_enable(&skge->napi);
-		netif_wake_queue(dev);
-	}
 
 	return err;
 }
-
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