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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
8#ifndef _FC_FC2_H_
9#define _FC_FC2_H_
10
11/*
12 * Fibre Channel Exchanges and Sequences.
13 */
14#ifndef PACKED
15#define PACKED __attribute__ ((__packed__))
16#endif /* PACKED */
17
18
19/*
20 * Sequence Status Block.
21 * This format is set by the FC-FS standard and is sent over the wire.
22 * Note that the fields aren't all naturally aligned.
23 */
24struct fc_ssb {
25 __u8 ssb_seq_id; /* sequence ID */
26 __u8 _ssb_resvd;
27 __be16 ssb_low_seq_cnt; /* lowest SEQ_CNT */
28
29 __be16 ssb_high_seq_cnt; /* highest SEQ_CNT */
30 __be16 ssb_s_stat; /* sequence status flags */
31
32 __be16 ssb_err_seq_cnt; /* error SEQ_CNT */
33 __u8 ssb_fh_cs_ctl; /* frame header CS_CTL */
34 __be16 ssb_fh_ox_id; /* frame header OX_ID */
35 __be16 ssb_rx_id; /* responder's exchange ID */
36 __u8 _ssb_resvd2[2];
37} PACKED;
38
39/*
40 * The SSB should be 17 bytes. Since it's layout is somewhat strange,
41 * we define the size here so that code can ASSERT that the size comes out
42 * correct.
43 */
44#define FC_SSB_SIZE 17 /* length of fc_ssb for assert */
45
46/*
47 * ssb_s_stat - flags from FC-FS-2 T11/1619-D Rev 0.90.
48 */
49#define SSB_ST_RESP (1 << 15) /* sequence responder */
50#define SSB_ST_ACTIVE (1 << 14) /* sequence is active */
51#define SSB_ST_ABNORMAL (1 << 12) /* abnormal ending condition */
52
53#define SSB_ST_REQ_MASK (3 << 10) /* ACK, abort sequence condition */
54#define SSB_ST_REQ_CONT (0 << 10)
55#define SSB_ST_REQ_ABORT (1 << 10)
56#define SSB_ST_REQ_STOP (2 << 10)
57#define SSB_ST_REQ_RETRANS (3 << 10)
58
59#define SSB_ST_ABTS (1 << 9) /* ABTS protocol completed */
60#define SSB_ST_RETRANS (1 << 8) /* retransmission completed */
61#define SSB_ST_TIMEOUT (1 << 7) /* sequence timed out by recipient */
62#define SSB_ST_P_RJT (1 << 6) /* P_RJT transmitted */
63
64#define SSB_ST_CLASS_BIT 4 /* class of service field LSB */
65#define SSB_ST_CLASS_MASK 3 /* class of service mask */
66#define SSB_ST_ACK (1 << 3) /* ACK (EOFt or EOFdt) transmitted */
67
68/*
69 * Exchange Status Block.
70 * This format is set by the FC-FS standard and is sent over the wire.
71 * Note that the fields aren't all naturally aligned.
72 */
73struct fc_esb {
74 __u8 esb_cs_ctl; /* CS_CTL for frame header */
75 __be16 esb_ox_id; /* originator exchange ID */
76 __be16 esb_rx_id; /* responder exchange ID */
77 __be32 esb_orig_fid; /* fabric ID of originator */
78 __be32 esb_resp_fid; /* fabric ID of responder */
79 __be32 esb_e_stat; /* status */
80 __u8 _esb_resvd[4];
81 __u8 esb_service_params[112]; /* TBD */
82 __u8 esb_seq_status[8]; /* sequence statuses, 8 bytes each */
83} __attribute__((packed));
84
85/*
86 * Define expected size for ASSERTs.
87 * See comments on FC_SSB_SIZE.
88 */
89#define FC_ESB_SIZE (1 + 5*4 + 112 + 8) /* expected size */
90
91/*
92 * esb_e_stat - flags from FC-FS-2 T11/1619-D Rev 0.90.
93 */
94#define ESB_ST_RESP (1 << 31) /* responder to exchange */
95#define ESB_ST_SEQ_INIT (1 << 30) /* port holds sequence initiative */
96#define ESB_ST_COMPLETE (1 << 29) /* exchange is complete */
97#define ESB_ST_ABNORMAL (1 << 28) /* abnormal ending condition */
98#define ESB_ST_REC_QUAL (1 << 26) /* recovery qualifier active */
99
100#define ESB_ST_ERRP_BIT 24 /* LSB for error policy */
101#define ESB_ST_ERRP_MASK (3 << 24) /* mask for error policy */
102#define ESB_ST_ERRP_MULT (0 << 24) /* abort, discard multiple sequences */
103#define ESB_ST_ERRP_SING (1 << 24) /* abort, discard single sequence */
104#define ESB_ST_ERRP_INF (2 << 24) /* process with infinite buffers */
105#define ESB_ST_ERRP_IMM (3 << 24) /* discard mult. with immed. retran. */
106
107#define ESB_ST_OX_ID_INVL (1 << 23) /* originator XID invalid */
108#define ESB_ST_RX_ID_INVL (1 << 22) /* responder XID invalid */
109#define ESB_ST_PRI_INUSE (1 << 21) /* priority / preemption in use */
110
111#endif /* _FC_FC2_H_ */