1/*
2 * Copyright(c) 2007 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
16 *
17 * Maintained at www.Open-FCoE.org
18 */
19
20#ifndef _FC_FC2_H_
21#define _FC_FC2_H_
22
23/*
24 * Fibre Channel Exchanges and Sequences.
25 */
26#ifndef PACKED
27#define PACKED  __attribute__ ((__packed__))
28#endif /* PACKED */
29
30
31/*
32 * Sequence Status Block.
33 * This format is set by the FC-FS standard and is sent over the wire.
34 * Note that the fields aren't all naturally aligned.
35 */
36struct fc_ssb {
37	__u8	ssb_seq_id;		/* sequence ID */
38	__u8	_ssb_resvd;
39	__be16	ssb_low_seq_cnt;	/* lowest SEQ_CNT */
40
41	__be16	ssb_high_seq_cnt;	/* highest SEQ_CNT */
42	__be16	ssb_s_stat;		/* sequence status flags */
43
44	__be16	ssb_err_seq_cnt;	/* error SEQ_CNT */
45	__u8	ssb_fh_cs_ctl;		/* frame header CS_CTL */
46	__be16	ssb_fh_ox_id;		/* frame header OX_ID */
47	__be16	ssb_rx_id;		/* responder's exchange ID */
48	__u8	_ssb_resvd2[2];
49} PACKED;
50
51/*
52 * The SSB should be 17 bytes.  Since it's layout is somewhat strange,
53 * we define the size here so that code can ASSERT that the size comes out
54 * correct.
55 */
56#define FC_SSB_SIZE         17          /* length of fc_ssb for assert */
57
58/*
59 * ssb_s_stat - flags from FC-FS-2 T11/1619-D Rev 0.90.
60 */
61#define SSB_ST_RESP         (1 << 15)   /* sequence responder */
62#define SSB_ST_ACTIVE       (1 << 14)   /* sequence is active */
63#define SSB_ST_ABNORMAL     (1 << 12)   /* abnormal ending condition */
64
65#define SSB_ST_REQ_MASK     (3 << 10)   /* ACK, abort sequence condition */
66#define SSB_ST_REQ_CONT     (0 << 10)
67#define SSB_ST_REQ_ABORT    (1 << 10)
68#define SSB_ST_REQ_STOP     (2 << 10)
69#define SSB_ST_REQ_RETRANS  (3 << 10)
70
71#define SSB_ST_ABTS         (1 << 9)    /* ABTS protocol completed */
72#define SSB_ST_RETRANS      (1 << 8)    /* retransmission completed */
73#define SSB_ST_TIMEOUT      (1 << 7)    /* sequence timed out by recipient */
74#define SSB_ST_P_RJT        (1 << 6)    /* P_RJT transmitted */
75
76#define SSB_ST_CLASS_BIT    4           /* class of service field LSB */
77#define SSB_ST_CLASS_MASK   3           /* class of service mask */
78#define SSB_ST_ACK          (1 << 3)    /* ACK (EOFt or EOFdt) transmitted */
79
80/*
81 * Exchange Status Block.
82 * This format is set by the FC-FS standard and is sent over the wire.
83 * Note that the fields aren't all naturally aligned.
84 */
85struct fc_esb {
86	__u8	esb_cs_ctl;		/* CS_CTL for frame header */
87	__be16	esb_ox_id;		/* originator exchange ID */
88	__be16	esb_rx_id;		/* responder exchange ID */
89	__be32	esb_orig_fid;		/* fabric ID of originator */
90	__be32	esb_resp_fid;		/* fabric ID of responder */
91	__be32	esb_e_stat;		/* status */
92	__u8	_esb_resvd[4];
93	__u8	esb_service_params[112]; /* TBD */
94	__u8	esb_seq_status[8];	/* sequence statuses, 8 bytes each */
95} __attribute__((packed));
96
97/*
98 * Define expected size for ASSERTs.
99 * See comments on FC_SSB_SIZE.
100 */
101#define FC_ESB_SIZE         (1 + 5*4 + 112 + 8)     /* expected size */
102
103/*
104 * esb_e_stat - flags from FC-FS-2 T11/1619-D Rev 0.90.
105 */
106#define ESB_ST_RESP         (1 << 31)   /* responder to exchange */
107#define ESB_ST_SEQ_INIT     (1 << 30)   /* port holds sequence initiative */
108#define ESB_ST_COMPLETE     (1 << 29)   /* exchange is complete */
109#define ESB_ST_ABNORMAL     (1 << 28)   /* abnormal ending condition */
110#define ESB_ST_REC_QUAL     (1 << 26)   /* recovery qualifier active */
111
112#define ESB_ST_ERRP_BIT     24          /* LSB for error policy */
113#define ESB_ST_ERRP_MASK    (3 << 24)   /* mask for error policy */
114#define ESB_ST_ERRP_MULT    (0 << 24)   /* abort, discard multiple sequences */
115#define ESB_ST_ERRP_SING    (1 << 24)   /* abort, discard single sequence */
116#define ESB_ST_ERRP_INF     (2 << 24)   /* process with infinite buffers */
117#define ESB_ST_ERRP_IMM     (3 << 24)   /* discard mult. with immed. retran. */
118
119#define ESB_ST_OX_ID_INVL   (1 << 23)   /* originator XID invalid */
120#define ESB_ST_RX_ID_INVL   (1 << 22)   /* responder XID invalid */
121#define ESB_ST_PRI_INUSE    (1 << 21)   /* priority / preemption in use */
122
123#endif /* _FC_FC2_H_ */
124