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Full Discussion: Compiling virtual network adapter driver problem (net_device struct)
Top Forums Programming Compiling virtual network adapter driver problem (net_device struct) Post 302465852 by Chrisdot on Sunday 24th of October 2010 03:48:27 PM
Old 10-24-2010
Yes, I have made a little research and found that net_device struct is a little bit different since 2009. I am trying to fit this code to new net_device struct that is no so easy.
Have you got any samples of network drivers basic source code?

I got now:

Code:
#include <linux/module.h>
#include <linux/config.h>
#include <linux/netdevice.h>


int virtualNIC_open(struct net_device *dev) {
 printk("virtualNIC_open called\n");
 netif_start_queue(dev);
 return 0;
}

int virtualNIC_release(struct net_device *dev) {
 printk("virtualNIC_release called\n");
 netif_stop_queue(dev);
 return 0;
}

static int virtualNIC_xmit(struct sk_buff *skb, struct net_device *dev) {
 printk("dummy xmit function called...\n");
 dev_kfree_skb(skb);
 return 0;
}

int virtualNIC_init(struct net_device *dev);


static const struct net_device_ops my_netdev_ops = {
 .ndo_init = virtualNIC_init,
 .ndo_open = virtualNIC_open,
 .ndo_stop = virtualNIC_release,
 .ndo_start_xmit = virtualNIC_xmit,
};

int virtualNIC_init(struct net_device *dev) {
 dev->netdev_ops = &my_netdev_ops;
 printk("virtualNIC device initialized\n");

struct net_device virtualNIC = {
 .netdev_ops = &my_netdev_ops
/* .netdev_ops.ndo_init: virtualNIC_init*/
};

int virtualNIC_init_module(void) {
 int result;
 strcpy(virtualNIC.name, "virtual network adapter");
 if((result = register_netdev(&virtualNIC))) {
  printk("virtualNIC: Error %d initalizing card ...", result);
  return result;
 }
 return 0;
}

I can compile it, but if I type 'insmod mymodule' then segmentation fault occurs. Don't know solution.
Last edited by Chrisdot; 10-24-2010 at 05:42 PM..
 

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LEARN ABOUT NETBSD

ptm

PTM(4)							   BSD Kernel Interfaces Manual 						    PTM(4)

NAME

     ptm -- pseudo-terminal multiplexor device

SYNOPSIS

     pseudo-device pty [count]

DESCRIPTION

     The ptm driver is the backend for the /dev/ptm device.  It supports three ioctl(2)s.  The first is TIOCPTMGET, which allocates a free pseudo-
     terminal device, sets its user ID to the calling user, revoke(2)s it, and returns the opened file descriptors for both the master and the
     slave pseudo-terminal device to the caller in a struct ptmget.  This struct has the following content:

	   struct ptmget {
		   int	   cfd;
		   int	   sfd;
		   char    cn[16];
		   char    sn[16];
	   };

     where cfd and sfd contain the master resp. slave device's file descriptor and cn and sn the corresponding paths in the file system.

     The /dev/ptmx device supports two more ioctl(2)s, TIOCGRANTPT, which is used by grantpt(3), TIOCPTSNAME, which is used by ptsname(3).

     The ptm device is included with the pseudo-device pty(4).	It can be disabled by adding ``options NO_DEV_PTM'' to the kernel configuration.

FILES

     /dev/ptm			       ptm access device

     /dev/ptmx			       ptm cloning device, used to implement Unix98 ptys

SEE ALSO

     grantpt(3), openpty(3), posix_openpt(3), ptsname(3), unlockpt(3), pty(4)

HISTORY

     The /dev/ptm device appeared in OpenBSD 3.5 and was ported to NetBSD 3.0.

BSD
								 November 12, 2005							       BSD
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