forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
126 lines
3.5 KiB
126 lines
3.5 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
|
/* |
|
* Copyright(c) 2007 Intel Corporation. All rights reserved. |
|
* |
|
* 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_ */
|
|
|