xref: /openbmc/linux/net/802/fc.c (revision a36954f5)
1  /*
2   * NET3:	Fibre Channel device handling subroutines
3   *
4   *		This program is free software; you can redistribute it and/or
5   *		modify it under the terms of the GNU General Public License
6   *		as published by the Free Software Foundation; either version
7   *		2 of the License, or (at your option) any later version.
8   *
9   *		Vineet Abraham <vma@iol.unh.edu>
10   *		v 1.0 03/22/99
11   */
12  
13  #include <linux/uaccess.h>
14  #include <linux/types.h>
15  #include <linux/kernel.h>
16  #include <linux/string.h>
17  #include <linux/mm.h>
18  #include <linux/socket.h>
19  #include <linux/in.h>
20  #include <linux/inet.h>
21  #include <linux/netdevice.h>
22  #include <linux/fcdevice.h>
23  #include <linux/skbuff.h>
24  #include <linux/errno.h>
25  #include <linux/timer.h>
26  #include <linux/net.h>
27  #include <linux/proc_fs.h>
28  #include <linux/init.h>
29  #include <linux/export.h>
30  #include <net/arp.h>
31  
32  /*
33   *	Put the headers on a Fibre Channel packet.
34   */
35  
36  static int fc_header(struct sk_buff *skb, struct net_device *dev,
37  		     unsigned short type,
38  		     const void *daddr, const void *saddr, unsigned int len)
39  {
40  	struct fch_hdr *fch;
41  	int hdr_len;
42  
43  	/*
44  	 * Add the 802.2 SNAP header if IP as the IPv4 code calls
45  	 * dev->hard_header directly.
46  	 */
47  	if (type == ETH_P_IP || type == ETH_P_ARP)
48  	{
49  		struct fcllc *fcllc;
50  
51  		hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);
52  		fch = (struct fch_hdr *)skb_push(skb, hdr_len);
53  		fcllc = (struct fcllc *)(fch+1);
54  		fcllc->dsap = fcllc->ssap = EXTENDED_SAP;
55  		fcllc->llc = UI_CMD;
56  		fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;
57  		fcllc->ethertype = htons(type);
58  	}
59  	else
60  	{
61  		hdr_len = sizeof(struct fch_hdr);
62  		fch = (struct fch_hdr *)skb_push(skb, hdr_len);
63  	}
64  
65  	if(saddr)
66  		memcpy(fch->saddr,saddr,dev->addr_len);
67  	else
68  		memcpy(fch->saddr,dev->dev_addr,dev->addr_len);
69  
70  	if(daddr)
71  	{
72  		memcpy(fch->daddr,daddr,dev->addr_len);
73  		return hdr_len;
74  	}
75  	return -hdr_len;
76  }
77  
78  static const struct header_ops fc_header_ops = {
79  	.create	 = fc_header,
80  };
81  
82  static void fc_setup(struct net_device *dev)
83  {
84  	dev->header_ops		= &fc_header_ops;
85  	dev->type		= ARPHRD_IEEE802;
86  	dev->hard_header_len	= FC_HLEN;
87  	dev->mtu		= 2024;
88  	dev->addr_len		= FC_ALEN;
89  	dev->tx_queue_len	= 100; /* Long queues on fc */
90  	dev->flags		= IFF_BROADCAST;
91  
92  	memset(dev->broadcast, 0xFF, FC_ALEN);
93  }
94  
95  /**
96   * alloc_fcdev - Register fibre channel device
97   * @sizeof_priv: Size of additional driver-private structure to be allocated
98   *	for this fibre channel device
99   *
100   * Fill in the fields of the device structure with fibre channel-generic values.
101   *
102   * Constructs a new net device, complete with a private data area of
103   * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
104   * this private data area.
105   */
106  struct net_device *alloc_fcdev(int sizeof_priv)
107  {
108  	return alloc_netdev(sizeof_priv, "fc%d", NET_NAME_UNKNOWN, fc_setup);
109  }
110  EXPORT_SYMBOL(alloc_fcdev);
111