1 /*
2 * Copyright(c) 2007 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
16 *
17 * Maintained at www.Open-FCoE.org
18 */
19
20 #ifndef _FC_FCOE_H_
21 #define _FC_FCOE_H_
22
23 /*
24 * FCoE - Fibre Channel over Ethernet.
25 */
26
27 /*
28 * The FCoE ethertype eventually goes in net/if_ether.h.
29 */
30 #ifndef ETH_P_FCOE
31 #define ETH_P_FCOE 0x8906 /* FCOE ether type */
32 #endif
33
34 /*
35 * FC_FCOE_OUI hasn't been standardized yet. XXX TBD.
36 */
37 #ifndef FC_FCOE_OUI
38 #define FC_FCOE_OUI 0x0efc00 /* upper 24 bits of FCOE dest MAC TBD */
39 #endif
40
41 /*
42 * The destination MAC address for the fabric login may get a different OUI.
43 * This isn't standardized yet.
44 */
45 #ifndef FC_FCOE_FLOGI_MAC
46 /* gateway MAC - TBD */
47 #define FC_FCOE_FLOGI_MAC { 0x0e, 0xfc, 0x00, 0xff, 0xff, 0xfe }
48 #endif
49
50 #define FC_FCOE_VER 0 /* version */
51
52 /*
53 * Ethernet Addresses based on FC S_ID and D_ID.
54 * Generated by FC_FCOE_OUI | S_ID/D_ID
55 */
56 #define FC_FCOE_ENCAPS_ID(n) (((u64) FC_FCOE_OUI << 24) | (n))
57 #define FC_FCOE_DECAPS_ID(n) ((n) >> 24)
58
59 /*
60 * FCoE frame header - 14 bytes
61 *
62 * This is the August 2007 version of the FCoE header as defined by T11.
63 * This follows the VLAN header, which includes the ethertype.
64 */
65 struct fcoe_hdr {
66 __u8 fcoe_ver; /* version field - upper 4 bits */
67 __u8 fcoe_resvd[12]; /* reserved - send zero and ignore */
68 __u8 fcoe_sof; /* start of frame per RFC 3643 */
69 };
70
71 #define FC_FCOE_DECAPS_VER(hp) ((hp)->fcoe_ver >> 4)
72 #define FC_FCOE_ENCAPS_VER(hp, ver) ((hp)->fcoe_ver = (ver) << 4)
73
74 /*
75 * FCoE CRC & EOF - 8 bytes.
76 */
77 struct fcoe_crc_eof {
78 __le32 fcoe_crc32; /* CRC for FC packet */
79 __u8 fcoe_eof; /* EOF from RFC 3643 */
80 __u8 fcoe_resvd[3]; /* reserved - send zero and ignore */
81 } __attribute__((packed));
82
83 /*
84 * Minimum FCoE + FC header length
85 * 14 bytes FCoE header + 24 byte FC header = 38 bytes
86 */
87 #define FCOE_HEADER_LEN 38
88
89 /*
90 * Minimum FCoE frame size
91 * 14 bytes FCoE header + 24 byte FC header + 8 byte FCoE trailer = 46 bytes
92 */
93 #define FCOE_MIN_FRAME 46
94
95 /*
96 * fc_fcoe_set_mac - Store OUI + DID into MAC address field.
97 * @mac: mac address to be set
98 * @did: fc dest id to use
99 */
fc_fcoe_set_mac(u8 * mac,u8 * did)100 static inline void fc_fcoe_set_mac(u8 *mac, u8 *did)
101 {
102 mac[0] = (u8) (FC_FCOE_OUI >> 16);
103 mac[1] = (u8) (FC_FCOE_OUI >> 8);
104 mac[2] = (u8) FC_FCOE_OUI;
105 mac[3] = did[0];
106 mac[4] = did[1];
107 mac[5] = did[2];
108 }
109
110 #endif /* _FC_FCOE_H_ */
111