a61127c213
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 111 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000436.567572064@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright(c) 2007 Intel Corporation. All rights reserved.
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*
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* Maintained at www.Open-FCoE.org
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*/
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#ifndef _FC_ENCAPS_H_
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#define _FC_ENCAPS_H_
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/*
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* Protocol definitions from RFC 3643 - Fibre Channel Frame Encapsulation.
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*
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* Note: The frame length field is the number of 32-bit words in
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* the encapsulation including the fcip_encaps_header, CRC and EOF words.
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* The minimum frame length value in bytes is (32 + 24 + 4 + 4) * 4 = 64.
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* The maximum frame length value in bytes is (32 + 24 + 2112 + 4 + 4) = 2172.
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*/
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#define FC_ENCAPS_MIN_FRAME_LEN 64 /* min frame len (bytes) (see above) */
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#define FC_ENCAPS_MAX_FRAME_LEN (FC_ENCAPS_MIN_FRAME_LEN + FC_MAX_PAYLOAD)
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#define FC_ENCAPS_VER 1 /* current version number */
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struct fc_encaps_hdr {
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__u8 fc_proto; /* protocol number */
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__u8 fc_ver; /* version of encapsulation */
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__u8 fc_proto_n; /* ones complement of protocol */
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__u8 fc_ver_n; /* ones complement of version */
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unsigned char fc_proto_data[8]; /* protocol specific data */
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__be16 fc_len_flags; /* 10-bit length/4 w/ 6 flag bits */
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__be16 fc_len_flags_n; /* ones complement of length / flags */
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/*
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* Offset 0x10
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*/
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__be32 fc_time[2]; /* time stamp: seconds and fraction */
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__be32 fc_crc; /* CRC */
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__be32 fc_sof; /* start of frame (see FC_SOF below) */
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/* 0x20 - FC frame content followed by EOF word */
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};
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#define FCIP_ENCAPS_HDR_LEN 0x20 /* expected length for asserts */
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/*
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* Macro's for making redundant copies of EOF and SOF.
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*/
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#define FC_XY(x, y) ((((x) & 0xff) << 8) | ((y) & 0xff))
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#define FC_XYXY(x, y) ((FCIP_XY(x, y) << 16) | FCIP_XY(x, y))
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#define FC_XYNN(x, y) (FCIP_XYXY(x, y) ^ 0xffff)
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#define FC_SOF_ENCODE(n) FC_XYNN(n, n)
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#define FC_EOF_ENCODE(n) FC_XYNN(n, n)
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/*
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* SOF / EOF bytes.
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*/
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enum fc_sof {
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FC_SOF_F = 0x28, /* fabric */
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FC_SOF_I4 = 0x29, /* initiate class 4 */
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FC_SOF_I2 = 0x2d, /* initiate class 2 */
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FC_SOF_I3 = 0x2e, /* initiate class 3 */
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FC_SOF_N4 = 0x31, /* normal class 4 */
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FC_SOF_N2 = 0x35, /* normal class 2 */
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FC_SOF_N3 = 0x36, /* normal class 3 */
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FC_SOF_C4 = 0x39, /* activate class 4 */
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} __attribute__((packed));
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enum fc_eof {
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FC_EOF_N = 0x41, /* normal (not last frame of seq) */
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FC_EOF_T = 0x42, /* terminate (last frame of sequence) */
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FC_EOF_RT = 0x44,
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FC_EOF_DT = 0x46, /* disconnect-terminate class-1 */
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FC_EOF_NI = 0x49, /* normal-invalid */
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FC_EOF_DTI = 0x4e, /* disconnect-terminate-invalid */
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FC_EOF_RTI = 0x4f,
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FC_EOF_A = 0x50, /* abort */
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} __attribute__((packed));
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#define FC_SOF_CLASS_MASK 0x06 /* mask for class of service in SOF */
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/*
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* Define classes in terms of the SOF code (initial).
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*/
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enum fc_class {
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FC_CLASS_NONE = 0, /* software value indicating no class */
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FC_CLASS_2 = FC_SOF_I2,
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FC_CLASS_3 = FC_SOF_I3,
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FC_CLASS_4 = FC_SOF_I4,
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FC_CLASS_F = FC_SOF_F,
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};
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/*
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* Determine whether SOF code indicates the need for a BLS ACK.
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*/
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static inline int fc_sof_needs_ack(enum fc_sof sof)
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{
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return (~sof) & 0x02; /* true for class 1, 2, 4, 6, or F */
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}
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/*
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* Given an fc_class, return the normal (non-initial) SOF value.
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*/
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static inline enum fc_sof fc_sof_normal(enum fc_class class)
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{
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return class + FC_SOF_N3 - FC_SOF_I3; /* diff is always 8 */
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}
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/*
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* Compute class from SOF value.
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*/
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static inline enum fc_class fc_sof_class(enum fc_sof sof)
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{
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return (sof & 0x7) | FC_SOF_F;
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}
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/*
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* Determine whether SOF is for the initial frame of a sequence.
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*/
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static inline int fc_sof_is_init(enum fc_sof sof)
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{
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return sof < 0x30;
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}
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#endif /* _FC_ENCAPS_H_ */
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