include/scsi/fc/fc_fcoe.h

   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  */
  84 struct fcoe_fc_els_lesb {
  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_ */