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  */
  26
  27 /*
  28  * FC_FCOE_OUI hasn't been standardized yet.   XXX TBD.
  29  */
  30 #ifndef FC_FCOE_OUI
  31 #define FC_FCOE_OUI     0x0efc00        /* upper 24 bits of FCOE dest MAC TBD */
  32 #endif
  33
  34 /*
  35  * The destination MAC address for the fabric login may get a different OUI.
  36  * This isn't standardized yet.
  37  */
  38 #ifndef FC_FCOE_FLOGI_MAC
  39 /* gateway MAC - TBD */
  40 #define FC_FCOE_FLOGI_MAC { 0x0e, 0xfc, 0x00, 0xff, 0xff, 0xfe }
  41 #endif
  42
  43 #define FC_FCOE_VER     0                       /* version */
  44
  45 /*
  46  * Ethernet Addresses based on FC S_ID and D_ID.
  47  * Generated by FC_FCOE_OUI | S_ID/D_ID
  48  */
  49 #define FC_FCOE_ENCAPS_ID(n)    (((u64) FC_FCOE_OUI << 24) | (n))
  50 #define FC_FCOE_DECAPS_ID(n)    ((n) >> 24)
  51
  52 /*
  53  * FCoE frame header - 14 bytes
  54  *
  55  * This is the August 2007 version of the FCoE header as defined by T11.
  56  * This follows the VLAN header, which includes the ethertype.
  57  */
  58 struct fcoe_hdr {
  59         __u8            fcoe_ver;       /* version field - upper 4 bits */
  60         __u8            fcoe_resvd[12]; /* reserved - send zero and ignore */
  61         __u8            fcoe_sof;       /* start of frame per RFC 3643 */
  62 };
  63
  64 #define FC_FCOE_DECAPS_VER(hp)      ((hp)->fcoe_ver >> 4)
  65 #define FC_FCOE_ENCAPS_VER(hp, ver) ((hp)->fcoe_ver = (ver) << 4)
  66
  67 /*
  68  * FCoE CRC & EOF - 8 bytes.
  69  */
  70 struct fcoe_crc_eof {
  71         __le32          fcoe_crc32;     /* CRC for FC packet */
  72         __u8            fcoe_eof;       /* EOF from RFC 3643 */
  73         __u8            fcoe_resvd[3];  /* reserved - send zero and ignore */
  74 } __attribute__((packed));
  75
  76 /*
  77  * Minimum FCoE + FC header length
  78  * 14 bytes FCoE header + 24 byte FC header = 38 bytes
  79  */
  80 #define FCOE_HEADER_LEN 38
  81
  82 /*
  83  * Minimum FCoE frame size
  84  * 14 bytes FCoE header + 24 byte FC header + 8 byte FCoE trailer = 46 bytes
  85  */
  86 #define FCOE_MIN_FRAME 46
  87
  88 /*
  89  * fc_fcoe_set_mac - Store OUI + DID into MAC address field.
  90  * @mac: mac address to be set
  91  * @did: fc dest id to use
  92  */
  93 static inline void fc_fcoe_set_mac(u8 *mac, u8 *did)
  94 {
  95         mac[0] = (u8) (FC_FCOE_OUI >> 16);
  96         mac[1] = (u8) (FC_FCOE_OUI >> 8);
  97         mac[2] = (u8) FC_FCOE_OUI;
  98         mac[3] = did[0];
  99         mac[4] = did[1];
 100         mac[5] = did[2];
 101 }
 102
 103 #endif /* _FC_FCOE_H_ */