1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * NET3: Fibre Channel device handling subroutines
5 * Vineet Abraham <vma@iol.unh.edu>
9 #include <linux/uaccess.h>
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/string.h>
14 #include <linux/socket.h>
16 #include <linux/inet.h>
17 #include <linux/netdevice.h>
18 #include <linux/fcdevice.h>
19 #include <linux/skbuff.h>
20 #include <linux/errno.h>
21 #include <linux/timer.h>
22 #include <linux/net.h>
23 #include <linux/proc_fs.h>
24 #include <linux/init.h>
25 #include <linux/export.h>
29 * Put the headers on a Fibre Channel packet.
32 static int fc_header(struct sk_buff *skb, struct net_device *dev,
34 const void *daddr, const void *saddr, unsigned int len)
40 * Add the 802.2 SNAP header if IP as the IPv4 code calls
41 * dev->hard_header directly.
43 if (type == ETH_P_IP || type == ETH_P_ARP)
47 hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);
48 fch = skb_push(skb, hdr_len);
49 fcllc = (struct fcllc *)(fch+1);
50 fcllc->dsap = fcllc->ssap = EXTENDED_SAP;
52 fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;
53 fcllc->ethertype = htons(type);
57 hdr_len = sizeof(struct fch_hdr);
58 fch = skb_push(skb, hdr_len);
62 memcpy(fch->saddr,saddr,dev->addr_len);
64 memcpy(fch->saddr,dev->dev_addr,dev->addr_len);
68 memcpy(fch->daddr,daddr,dev->addr_len);
74 static const struct header_ops fc_header_ops = {
78 static void fc_setup(struct net_device *dev)
80 dev->header_ops = &fc_header_ops;
81 dev->type = ARPHRD_IEEE802;
82 dev->hard_header_len = FC_HLEN;
84 dev->addr_len = FC_ALEN;
85 dev->tx_queue_len = 100; /* Long queues on fc */
86 dev->flags = IFF_BROADCAST;
88 memset(dev->broadcast, 0xFF, FC_ALEN);
92 * alloc_fcdev - Register fibre channel device
93 * @sizeof_priv: Size of additional driver-private structure to be allocated
94 * for this fibre channel device
96 * Fill in the fields of the device structure with fibre channel-generic values.
98 * Constructs a new net device, complete with a private data area of
99 * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
100 * this private data area.
102 struct net_device *alloc_fcdev(int sizeof_priv)
104 return alloc_netdev(sizeof_priv, "fc%d", NET_NAME_UNKNOWN, fc_setup);
106 EXPORT_SYMBOL(alloc_fcdev);