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/* 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_ */
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