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  */
24 struct 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  */
73 struct 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_ */
112