LXR linux/include/scsi/fc/fc

   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 */
  58struct 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 */
  70struct 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 */
  93static 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_ */
 104