netdev - [PATCH 5/8] ibm_newemac: Workaround reset timeout when no link

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20071121060733.95E3CDDEDC@ozlabs.org>
Date:	Wed, 21 Nov 2007 17:06:43 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	<jgarzik@...ox.com>
CC:	<netdev@...r.kernel.org>, <linuxppc-dev@...abs.org>,
	Josh Boyer <jwboyer@...ux.vnet.ibm.com>
Subject: [PATCH 5/8] ibm_newemac: Workaround reset timeout when no link

With some PHYs, when the link goes away, the EMAC reset fails due
to the loss of the RX clock I believe.

The old EMAC driver worked around that using some internal chip-specific
clock force bits that are different on various 44x implementations.

This is an attempt at doing it differently, by avoiding the reset when
there is no link, but forcing loopback mode instead. It seems to work
on my Taishan 440GX based board so far.

Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Acked-by: Stefan Roese <sr@...x.de>
---

 drivers/net/ibm_newemac/core.c |   20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

Index: linux-work/drivers/net/ibm_newemac/core.c
===================================================================
--- linux-work.orig/drivers/net/ibm_newemac/core.c	2007-11-20 14:46:51.000000000 +1100
+++ linux-work/drivers/net/ibm_newemac/core.c	2007-11-20 14:46:58.000000000 +1100
@@ -464,26 +464,34 @@ static int emac_configure(struct emac_in
 {
 	struct emac_regs __iomem *p = dev->emacp;
 	struct net_device *ndev = dev->ndev;
-	int tx_size, rx_size;
+	int tx_size, rx_size, link = netif_carrier_ok(dev->ndev);
 	u32 r, mr1 = 0;
 
 	DBG(dev, "configure" NL);
 
-	if (emac_reset(dev) < 0)
+	if (!link) {
+		out_be32(&p->mr1, in_be32(&p->mr1)
+			 | EMAC_MR1_FDE | EMAC_MR1_ILE);
+		udelay(100);
+	} else if (emac_reset(dev) < 0)
 		return -ETIMEDOUT;
 
 	if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
 		tah_reset(dev->tah_dev);
 
-	DBG(dev, " duplex = %d, pause = %d, asym_pause = %d\n",
-	    dev->phy.duplex, dev->phy.pause, dev->phy.asym_pause);
+	DBG(dev, " link = %d duplex = %d, pause = %d, asym_pause = %d\n",
+	    link, dev->phy.duplex, dev->phy.pause, dev->phy.asym_pause);
 
 	/* Default fifo sizes */
 	tx_size = dev->tx_fifo_size;
 	rx_size = dev->rx_fifo_size;
 
+	/* No link, force loopback */
+	if (!link)
+		mr1 = EMAC_MR1_FDE | EMAC_MR1_ILE;
+
 	/* Check for full duplex */
-	if (dev->phy.duplex == DUPLEX_FULL)
+	else if (dev->phy.duplex == DUPLEX_FULL)
 		mr1 |= EMAC_MR1_FDE | EMAC_MR1_MWSW_001;
 
 	/* Adjust fifo sizes, mr1 and timeouts based on link speed */
@@ -1165,9 +1173,9 @@ static void emac_link_timer(struct work_
 		link_poll_interval = PHY_POLL_LINK_ON;
 	} else {
 		if (netif_carrier_ok(dev->ndev)) {
-			emac_reinitialize(dev);
 			netif_carrier_off(dev->ndev);
 			netif_tx_disable(dev->ndev);
+			emac_reinitialize(dev);
 			emac_print_link_status(dev);
 		}
 		link_poll_interval = PHY_POLL_LINK_OFF;
-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html