netdev - via-velocity netpoll enable (patch proposal)

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Message-ID: <47C49BFC.5040102@emisfr.com>
Date:	Wed, 27 Feb 2008 00:08:44 +0100
From:	Stéphane BERTHELOT <sberthelot@...sfr.com>
To:	romieu@...zoreil.com
CC:	netdev@...r.kernel.org
Subject: via-velocity netpoll enable (patch proposal)

Hello all,

I tried to use netconsole on via-velocity hardware to get some dmesg 
remotely.
Surprisingly the current driver does not seem to have netpoll function code.

I had a look at how it is done in 8139cp and tg3 and borrowed some lines 
to make a patch for via-velocity.
Though I tested it for some time, I didn't put the hardware at stress 
especially with high number of netpoll packets.
I am no expert of the via-velocity hardware so I don't know if disabling 
interrupts is necessary, but it works for me this way and netconsole is 
happy and didn't crash yet...


--- via-velocity.c.orig    2008-02-26 23:47:42.000000000 +0100
+++ via-velocity.c    2008-02-23 10:58:58.000000000 +0100
@@ -378,6 +379,9 @@
 static int velocity_change_mtu(struct net_device *dev, int mtu);
 static int velocity_xmit(struct sk_buff *skb, struct net_device *dev);
 static int velocity_intr(int irq, void *dev_instance);
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void velocity_poll_controller(struct net_device *dev);
+#endif
 static void velocity_set_multi(struct net_device *dev);
 static struct net_device_stats *velocity_get_stats(struct net_device *dev);
 static int velocity_ioctl(struct net_device *dev, struct ifreq *rq, int 
cmd);
@@ -955,6 +959,9 @@
     dev->set_multicast_list = velocity_set_multi;
     dev->do_ioctl = velocity_ioctl;
     dev->ethtool_ops = &velocity_ethtool_ops;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+        dev->poll_controller = velocity_poll_controller;
+#endif
     dev->change_mtu = velocity_change_mtu;
 
     dev->vlan_rx_add_vid = velocity_vlan_rx_add_vid;
@@ -2252,6 +2264,18 @@
 
 }
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/*
+ * Polling receive - used by netconsole and other diagnostic tools
+ * to allow network i/o with interrupts disabled.
+ */
+static void velocity_poll_controller(struct net_device *dev)
+{
+  disable_irq(dev->irq);
+  velocity_intr(dev->irq, dev);
+  enable_irq(dev->irq);
+}
+#endif
 
 /**
  *    velocity_set_multi    -    filter list change callback

-- 
Stéphane BERTHELOT
EmisFR
- Réseau : Sécurité et Serveurs , Développements métier et spécifiques -
10 rue Mazagran, 54000 NANCY, France
http://www.emisfr.com
Tel/Fax. 03 83 32 25 75

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