f032c2f7cd
Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
138 lines
4.1 KiB
C
138 lines
4.1 KiB
C
/*
|
|
* Copyright(c) 2007 Intel Corporation. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Maintained at www.Open-FCoE.org
|
|
*/
|
|
#ifndef _FC_ENCAPS_H_
|
|
#define _FC_ENCAPS_H_
|
|
|
|
/*
|
|
* Protocol definitions from RFC 3643 - Fibre Channel Frame Encapsulation.
|
|
*
|
|
* Note: The frame length field is the number of 32-bit words in
|
|
* the encapsulation including the fcip_encaps_header, CRC and EOF words.
|
|
* The minimum frame length value in bytes is (32 + 24 + 4 + 4) * 4 = 64.
|
|
* The maximum frame length value in bytes is (32 + 24 + 2112 + 4 + 4) = 2172.
|
|
*/
|
|
#define FC_ENCAPS_MIN_FRAME_LEN 64 /* min frame len (bytes) (see above) */
|
|
#define FC_ENCAPS_MAX_FRAME_LEN (FC_ENCAPS_MIN_FRAME_LEN + FC_MAX_PAYLOAD)
|
|
|
|
#define FC_ENCAPS_VER 1 /* current version number */
|
|
|
|
struct fc_encaps_hdr {
|
|
__u8 fc_proto; /* protocol number */
|
|
__u8 fc_ver; /* version of encapsulation */
|
|
__u8 fc_proto_n; /* ones complement of protocol */
|
|
__u8 fc_ver_n; /* ones complement of version */
|
|
|
|
unsigned char fc_proto_data[8]; /* protocol specific data */
|
|
|
|
__be16 fc_len_flags; /* 10-bit length/4 w/ 6 flag bits */
|
|
__be16 fc_len_flags_n; /* ones complement of length / flags */
|
|
|
|
/*
|
|
* Offset 0x10
|
|
*/
|
|
__be32 fc_time[2]; /* time stamp: seconds and fraction */
|
|
__be32 fc_crc; /* CRC */
|
|
__be32 fc_sof; /* start of frame (see FC_SOF below) */
|
|
|
|
/* 0x20 - FC frame content followed by EOF word */
|
|
};
|
|
|
|
#define FCIP_ENCAPS_HDR_LEN 0x20 /* expected length for asserts */
|
|
|
|
/*
|
|
* Macro's for making redundant copies of EOF and SOF.
|
|
*/
|
|
#define FC_XY(x, y) ((((x) & 0xff) << 8) | ((y) & 0xff))
|
|
#define FC_XYXY(x, y) ((FCIP_XY(x, y) << 16) | FCIP_XY(x, y))
|
|
#define FC_XYNN(x, y) (FCIP_XYXY(x, y) ^ 0xffff)
|
|
|
|
#define FC_SOF_ENCODE(n) FC_XYNN(n, n)
|
|
#define FC_EOF_ENCODE(n) FC_XYNN(n, n)
|
|
|
|
/*
|
|
* SOF / EOF bytes.
|
|
*/
|
|
enum fc_sof {
|
|
FC_SOF_F = 0x28, /* fabric */
|
|
FC_SOF_I4 = 0x29, /* initiate class 4 */
|
|
FC_SOF_I2 = 0x2d, /* initiate class 2 */
|
|
FC_SOF_I3 = 0x2e, /* initiate class 3 */
|
|
FC_SOF_N4 = 0x31, /* normal class 4 */
|
|
FC_SOF_N2 = 0x35, /* normal class 2 */
|
|
FC_SOF_N3 = 0x36, /* normal class 3 */
|
|
FC_SOF_C4 = 0x39, /* activate class 4 */
|
|
} __attribute__((packed));
|
|
|
|
enum fc_eof {
|
|
FC_EOF_N = 0x41, /* normal (not last frame of seq) */
|
|
FC_EOF_T = 0x42, /* terminate (last frame of sequence) */
|
|
FC_EOF_RT = 0x44,
|
|
FC_EOF_DT = 0x46, /* disconnect-terminate class-1 */
|
|
FC_EOF_NI = 0x49, /* normal-invalid */
|
|
FC_EOF_DTI = 0x4e, /* disconnect-terminate-invalid */
|
|
FC_EOF_RTI = 0x4f,
|
|
FC_EOF_A = 0x50, /* abort */
|
|
} __attribute__((packed));
|
|
|
|
#define FC_SOF_CLASS_MASK 0x06 /* mask for class of service in SOF */
|
|
|
|
/*
|
|
* Define classes in terms of the SOF code (initial).
|
|
*/
|
|
enum fc_class {
|
|
FC_CLASS_NONE = 0, /* software value indicating no class */
|
|
FC_CLASS_2 = FC_SOF_I2,
|
|
FC_CLASS_3 = FC_SOF_I3,
|
|
FC_CLASS_4 = FC_SOF_I4,
|
|
FC_CLASS_F = FC_SOF_F,
|
|
};
|
|
|
|
/*
|
|
* Determine whether SOF code indicates the need for a BLS ACK.
|
|
*/
|
|
static inline int fc_sof_needs_ack(enum fc_sof sof)
|
|
{
|
|
return (~sof) & 0x02; /* true for class 1, 2, 4, 6, or F */
|
|
}
|
|
|
|
/*
|
|
* Given an fc_class, return the normal (non-initial) SOF value.
|
|
*/
|
|
static inline enum fc_sof fc_sof_normal(enum fc_class class)
|
|
{
|
|
return class + FC_SOF_N3 - FC_SOF_I3; /* diff is always 8 */
|
|
}
|
|
|
|
/*
|
|
* Compute class from SOF value.
|
|
*/
|
|
static inline enum fc_class fc_sof_class(enum fc_sof sof)
|
|
{
|
|
return (sof & 0x7) | FC_SOF_F;
|
|
}
|
|
|
|
/*
|
|
* Determine whether SOF is for the initial frame of a sequence.
|
|
*/
|
|
static inline int fc_sof_is_init(enum fc_sof sof)
|
|
{
|
|
return sof < 0x30;
|
|
}
|
|
|
|
#endif /* _FC_ENCAPS_H_ */
|