The current version of the natsemi driver comes with a workaround
for a hardware problem that causes link failures on short cables.
Unfortunately, this workaround causes massive link failures on _long_
cables (270-300ft). This patch adds a module parameter to disable
the workaround if required.
Signed-off-by: Olaf Kirch <okir@xxxxxxx>
Index: linux-2.6.10/drivers/net/natsemi.c
===================================================================
--- linux-2.6.10.orig/drivers/net/natsemi.c
+++ linux-2.6.10/drivers/net/natsemi.c
@@ -186,6 +186,7 @@ static int debug = -1;
/* Maximum events (Rx packets, etc.) to handle at each interrupt. */
static int max_interrupt_work = 20;
static int mtu;
+static int no_cable_magic = 0;
/* Maximum number of multicast addresses to filter (vs. rx-all-multicast).
This chip uses a 512 element hash table based on the Ethernet CRC. */
@@ -257,6 +258,7 @@ module_param(debug, int, 0);
module_param(rx_copybreak, int, 0);
module_param_array(options, int, NULL, 0);
module_param_array(full_duplex, int, NULL, 0);
+module_param(no_cable_magic, int, 0);
MODULE_PARM_DESC(max_interrupt_work,
"DP8381x maximum events handled per interrupt");
MODULE_PARM_DESC(mtu, "DP8381x MTU (all boards)");
@@ -266,6 +268,9 @@ MODULE_PARM_DESC(rx_copybreak,
MODULE_PARM_DESC(options,
"DP8381x: Bits 0-3: media type, bit 17: full duplex");
MODULE_PARM_DESC(full_duplex, "DP8381x full duplex setting(s) (1)");
+MODULE_PARM_DESC(no_cable_magic,
+ "DP8381x: set no_cable_magic=1 to disable magic workaround for short
cables "
+ "(may help with long cables:-)");
/*
Theory of Operation
@@ -1578,6 +1583,9 @@ static void do_cable_magic(struct net_de
struct netdev_private *np = netdev_priv(dev);
void __iomem *ioaddr = ns_ioaddr(dev);
+ if (no_cable_magic)
+ return;
+
if (dev->if_port != PORT_TP)
return;
@@ -1623,6 +1631,9 @@ static void undo_cable_magic(struct net_
struct netdev_private *np = netdev_priv(dev);
void __iomem * ioaddr = ns_ioaddr(dev);
+ if (no_cable_magic)
+ return;
+
if (dev->if_port != PORT_TP)
return;
--
Olaf Kirch | --- o --- Nous sommes du soleil we love when we play
okir@xxxxxxx | / | \ sol.dhoop.naytheet.ah kin.ir.samse.qurax
|