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fc_fcoe.h
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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  * See T11 FC-BB-5 Rev 2.00 (09-056v5.pdf)
26  */
27 
28 /*
29  * Default FC_FCOE_OUI / FC-MAP value.
30  */
31 #define FC_FCOE_OUI 0x0efc00 /* upper 24 bits of FCOE MAC */
32 
33 /*
34  * Fabric Login (FLOGI) MAC for non-FIP use. Non-FIP use is deprecated.
35  */
36 #define FC_FCOE_FLOGI_MAC { 0x0e, 0xfc, 0x00, 0xff, 0xff, 0xfe }
37 
38 #define FC_FCOE_VER 0 /* version */
39 
40 /*
41  * Ethernet Addresses based on FC S_ID and D_ID.
42  * Generated by FC_FCOE_OUI | S_ID/D_ID
43  */
44 #define FC_FCOE_ENCAPS_ID(n) (((u64) FC_FCOE_OUI << 24) | (n))
45 #define FC_FCOE_DECAPS_ID(n) ((n) >> 24)
46 
47 /*
48  * FCoE frame header - 14 bytes
49  * This follows the VLAN header, which includes the ethertype.
50  */
51 struct fcoe_hdr {
52  __u8 fcoe_ver; /* version field - upper 4 bits */
53  __u8 fcoe_resvd[12]; /* reserved - send zero and ignore */
54  __u8 fcoe_sof; /* start of frame per RFC 3643 */
55 };
56 
57 #define FC_FCOE_DECAPS_VER(hp) ((hp)->fcoe_ver >> 4)
58 #define FC_FCOE_ENCAPS_VER(hp, ver) ((hp)->fcoe_ver = (ver) << 4)
59 
60 /*
61  * FCoE CRC & EOF - 8 bytes.
62  */
63 struct fcoe_crc_eof {
64  __le32 fcoe_crc32; /* CRC for FC packet */
65  __u8 fcoe_eof; /* EOF from RFC 3643 */
66  __u8 fcoe_resvd[3]; /* reserved - send zero and ignore */
67 } __attribute__((packed));
68 
69 /*
70  * Minimum FCoE + FC header length
71  * 14 bytes FCoE header + 24 byte FC header = 38 bytes
72  */
73 #define FCOE_HEADER_LEN 38
74 
75 /*
76  * Minimum FCoE frame size
77  * 14 bytes FCoE header + 24 byte FC header + 8 byte FCoE trailer = 46 bytes
78  */
79 #define FCOE_MIN_FRAME 46
80 
81 /*
82  * FCoE Link Error Status Block: T11 FC-BB-5 Rev2.0, Clause 7.10.
83  */
85  __be32 lesb_link_fail; /* link failure count */
86  __be32 lesb_vlink_fail; /* virtual link failure count */
87  __be32 lesb_miss_fka; /* missing FIP keep-alive count */
88  __be32 lesb_symb_err; /* symbol error during carrier count */
89  __be32 lesb_err_block; /* errored block count */
90  __be32 lesb_fcs_error; /* frame check sequence error count */
91 };
92 
93 /*
94  * fc_fcoe_set_mac - Store OUI + DID into MAC address field.
95  * @mac: mac address to be set
96  * @did: fc dest id to use
97  */
98 static inline void fc_fcoe_set_mac(u8 *mac, u8 *did)
99 {
100  mac[0] = (u8) (FC_FCOE_OUI >> 16);
101  mac[1] = (u8) (FC_FCOE_OUI >> 8);
102  mac[2] = (u8) FC_FCOE_OUI;
103  mac[3] = did[0];
104  mac[4] = did[1];
105  mac[5] = did[2];
106 }
107 
108 #endif /* _FC_FCOE_H_ */