cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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fc_encaps.h (3568B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Copyright(c) 2007 Intel Corporation. All rights reserved.
      4 *
      5 * Maintained at www.Open-FCoE.org
      6 */
      7#ifndef _FC_ENCAPS_H_
      8#define _FC_ENCAPS_H_
      9
     10/*
     11 * Protocol definitions from RFC 3643 - Fibre Channel Frame Encapsulation.
     12 *
     13 * Note:  The frame length field is the number of 32-bit words in
     14 * the encapsulation including the fcip_encaps_header, CRC and EOF words.
     15 * The minimum frame length value in bytes is (32 + 24 + 4 + 4) * 4 = 64.
     16 * The maximum frame length value in bytes is (32 + 24 + 2112 + 4 + 4) = 2172.
     17 */
     18#define FC_ENCAPS_MIN_FRAME_LEN 64	/* min frame len (bytes) (see above) */
     19#define FC_ENCAPS_MAX_FRAME_LEN (FC_ENCAPS_MIN_FRAME_LEN + FC_MAX_PAYLOAD)
     20
     21#define FC_ENCAPS_VER       1           /* current version number */
     22
     23struct fc_encaps_hdr {
     24	__u8	fc_proto;	/* protocol number */
     25	__u8	fc_ver;		/* version of encapsulation */
     26	__u8	fc_proto_n;	/* ones complement of protocol */
     27	__u8	fc_ver_n;	/* ones complement of version */
     28
     29	unsigned char fc_proto_data[8]; /* protocol specific data */
     30
     31	__be16	fc_len_flags;	/* 10-bit length/4 w/ 6 flag bits */
     32	__be16	fc_len_flags_n;	/* ones complement of length / flags */
     33
     34	/*
     35	 * Offset 0x10
     36	 */
     37	__be32	fc_time[2];	/* time stamp: seconds and fraction */
     38	__be32	fc_crc;		/* CRC */
     39	__be32	fc_sof;		/* start of frame (see FC_SOF below) */
     40
     41	/* 0x20 - FC frame content followed by EOF word */
     42};
     43
     44#define FCIP_ENCAPS_HDR_LEN 0x20	/* expected length for asserts */
     45
     46/*
     47 * Macro's for making redundant copies of EOF and SOF.
     48 */
     49#define FC_XY(x, y)		((((x) & 0xff) << 8) | ((y) & 0xff))
     50#define FC_XYXY(x, y)		((FCIP_XY(x, y) << 16) | FCIP_XY(x, y))
     51#define FC_XYNN(x, y)		(FCIP_XYXY(x, y) ^ 0xffff)
     52
     53#define FC_SOF_ENCODE(n)	FC_XYNN(n, n)
     54#define FC_EOF_ENCODE(n)	FC_XYNN(n, n)
     55
     56/*
     57 * SOF / EOF bytes.
     58 */
     59enum fc_sof {
     60	FC_SOF_F =	0x28,	/* fabric */
     61	FC_SOF_I4 =	0x29,	/* initiate class 4 */
     62	FC_SOF_I2 =	0x2d,	/* initiate class 2 */
     63	FC_SOF_I3 =	0x2e,	/* initiate class 3 */
     64	FC_SOF_N4 =	0x31,	/* normal class 4 */
     65	FC_SOF_N2 =	0x35,	/* normal class 2 */
     66	FC_SOF_N3 =	0x36,	/* normal class 3 */
     67	FC_SOF_C4 =	0x39,	/* activate class 4 */
     68} __attribute__((packed));
     69
     70enum fc_eof {
     71	FC_EOF_N =	0x41,	/* normal (not last frame of seq) */
     72	FC_EOF_T =	0x42,	/* terminate (last frame of sequence) */
     73	FC_EOF_RT =	0x44,
     74	FC_EOF_DT =	0x46,	/* disconnect-terminate class-1 */
     75	FC_EOF_NI =	0x49,	/* normal-invalid */
     76	FC_EOF_DTI =	0x4e,	/* disconnect-terminate-invalid */
     77	FC_EOF_RTI =	0x4f,
     78	FC_EOF_A =	0x50,	/* abort */
     79} __attribute__((packed));
     80
     81#define FC_SOF_CLASS_MASK 0x06	/* mask for class of service in SOF */
     82
     83/*
     84 * Define classes in terms of the SOF code (initial).
     85 */
     86enum fc_class {
     87	FC_CLASS_NONE = 0,	/* software value indicating no class */
     88	FC_CLASS_2 =	FC_SOF_I2,
     89	FC_CLASS_3 =	FC_SOF_I3,
     90	FC_CLASS_4 =	FC_SOF_I4,
     91	FC_CLASS_F =	FC_SOF_F,
     92};
     93
     94/*
     95 * Determine whether SOF code indicates the need for a BLS ACK.
     96 */
     97static inline int fc_sof_needs_ack(enum fc_sof sof)
     98{
     99	return (~sof) & 0x02;	/* true for class 1, 2, 4, 6, or F */
    100}
    101
    102/*
    103 * Given an fc_class, return the normal (non-initial) SOF value.
    104 */
    105static inline enum fc_sof fc_sof_normal(enum fc_class class)
    106{
    107	return class + FC_SOF_N3 - FC_SOF_I3;	/* diff is always 8 */
    108}
    109
    110/*
    111 * Compute class from SOF value.
    112 */
    113static inline enum fc_class fc_sof_class(enum fc_sof sof)
    114{
    115	return (sof & 0x7) | FC_SOF_F;
    116}
    117
    118/*
    119 * Determine whether SOF is for the initial frame of a sequence.
    120 */
    121static inline int fc_sof_is_init(enum fc_sof sof)
    122{
    123	return sof < 0x30;
    124}
    125
    126#endif /* _FC_ENCAPS_H_ */