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_FCP_H_
9 #define	_FC_FCP_H_
10 
11 #include <scsi/scsi.h>
12 
13 /*
14  * Fibre Channel Protocol for SCSI.
15  * From T10 FCP-3, T10 project 1560-D Rev 4, Sept. 13, 2005.
16  */
17 
18 /*
19  * fc/fs.h defines FC_TYPE_FCP.
20  */
21 
22 /*
23  * Service parameter page parameters (word 3 bits) for Process Login.
24  */
25 #define	FCP_SPPF_TASK_RETRY_ID	0x0200	/* task retry ID requested */
26 #define	FCP_SPPF_RETRY		0x0100	/* retry supported */
27 #define	FCP_SPPF_CONF_COMPL	0x0080	/* confirmed completion allowed */
28 #define	FCP_SPPF_OVLY_ALLOW	0x0040	/* data overlay allowed */
29 #define	FCP_SPPF_INIT_FCN	0x0020	/* initiator function */
30 #define	FCP_SPPF_TARG_FCN	0x0010	/* target function */
31 #define	FCP_SPPF_RD_XRDY_DIS	0x0002	/* disable XFER_RDY for reads */
32 #define	FCP_SPPF_WR_XRDY_DIS	0x0001	/* disable XFER_RDY for writes */
33 
34 /*
35  * FCP_CMND IU Payload.
36  */
37 struct fcp_cmnd {
38 	struct scsi_lun	fc_lun;		/* logical unit number */
39 	__u8		fc_cmdref;	/* command reference number */
40 	__u8		fc_pri_ta;	/* priority and task attribute */
41 	__u8		fc_tm_flags;	/* task management flags */
42 	__u8		fc_flags;	/* additional len & flags */
43 	__u8		fc_cdb[16];	/* base CDB */
44 	__be32		fc_dl;		/* data length (must follow fc_cdb) */
45 };
46 
47 #define	FCP_CMND_LEN	32	/* expected length of structure */
48 
49 struct fcp_cmnd32 {
50 	struct scsi_lun	fc_lun;		/* logical unit number */
51 	__u8		fc_cmdref;	/* command reference number */
52 	__u8		fc_pri_ta;	/* priority and task attribute */
53 	__u8		fc_tm_flags;	/* task management flags */
54 	__u8		fc_flags;	/* additional len & flags */
55 	__u8		fc_cdb[32];	/* base CDB */
56 	__be32		fc_dl;		/* data length (must follow fc_cdb) */
57 };
58 
59 #define	FCP_CMND32_LEN	    48	/* expected length of structure */
60 #define	FCP_CMND32_ADD_LEN  (16 / 4)	/* Additional cdb length */
61 
62 /*
63  * fc_pri_ta.
64  */
65 #define	FCP_PTA_SIMPLE	    0	/* simple task attribute */
66 #define	FCP_PTA_HEADQ	    1	/* head of queue task attribute */
67 #define	FCP_PTA_ORDERED     2	/* ordered task attribute */
68 #define	FCP_PTA_ACA	    4	/* auto. contingent allegiance */
69 #define	FCP_PTA_MASK	    7	/* mask for task attribute field */
70 #define	FCP_PRI_SHIFT	    3	/* priority field starts in bit 3 */
71 #define	FCP_PRI_RESVD_MASK  0x80	/* reserved bits in priority field */
72 
73 /*
74  * fc_tm_flags - task management flags field.
75  */
76 #define	FCP_TMF_CLR_ACA		0x40	/* clear ACA condition */
77 #define	FCP_TMF_TGT_RESET	0x20	/* target reset task management,
78 					   deprecated as of FCP-3 */
79 #define	FCP_TMF_LUN_RESET	0x10	/* logical unit reset task management */
80 #define	FCP_TMF_CLR_TASK_SET	0x04	/* clear task set */
81 #define	FCP_TMF_ABT_TASK_SET	0x02	/* abort task set */
82 
83 /*
84  * fc_flags.
85  *  Bits 7:2 are the additional FCP_CDB length / 4.
86  */
87 #define	FCP_CFL_LEN_MASK	0xfc	/* mask for additional length */
88 #define	FCP_CFL_LEN_SHIFT	2	/* shift bits for additional length */
89 #define	FCP_CFL_RDDATA		0x02	/* read data */
90 #define	FCP_CFL_WRDATA		0x01	/* write data */
91 
92 /*
93  * FCP_TXRDY IU - transfer ready payload.
94  */
95 struct fcp_txrdy {
96 	__be32		ft_data_ro;	/* data relative offset */
97 	__be32		ft_burst_len;	/* burst length */
98 	__u8		_ft_resvd[4];	/* reserved */
99 };
100 
101 #define	FCP_TXRDY_LEN	12	/* expected length of structure */
102 
103 /*
104  * FCP_RESP IU - response payload.
105  *
106  * The response payload comes in three parts: the flags/status, the
107  * sense/response lengths and the sense data/response info section.
108  *
109  * From FCP3r04, note 6 of section 9.5.13:
110  *
111  * Some early implementations presented the FCP_RSP IU without the FCP_RESID,
112  * FCP_SNS_LEN, and FCP_RSP_LEN fields if the FCP_RESID_UNDER, FCP_RESID_OVER,
113  * FCP_SNS_LEN_VALID, and FCP_RSP_LEN_VALID bits were all set to zero. This
114  * non-standard behavior should be tolerated.
115  *
116  * All response frames will always contain the fcp_resp template.  Some
117  * will also include the fcp_resp_len template.
118  *
119  * From Table 23, the FCP_RSP_INFO can either be 4 bytes or 8 bytes, both
120  * are valid length.
121  */
122 struct fcp_resp {
123 	__u8		_fr_resvd[8];	/* reserved */
124 	__be16		fr_retry_delay;	/* retry delay timer */
125 	__u8		fr_flags;	/* flags */
126 	__u8		fr_status;	/* SCSI status code */
127 };
128 
129 #define	FCP_RESP_LEN	12	/* expected length of structure */
130 
131 struct fcp_resp_ext {
132 	__be32		fr_resid;	/* Residual value */
133 	__be32		fr_sns_len;	/* SCSI Sense length */
134 	__be32		fr_rsp_len;	/* Response Info length */
135 
136 	/*
137 	 * Optionally followed by RSP info and/or SNS info and/or
138 	 * bidirectional read residual length, if any.
139 	 */
140 };
141 
142 #define FCP_RESP_EXT_LEN    12  /* expected length of the structure */
143 
144 struct fcp_resp_rsp_info {
145     __u8      _fr_resvd[3];       /* reserved */
146     __u8      rsp_code;           /* Response Info Code */
147     __u8      _fr_resvd2[4];      /* reserved */
148 };
149 
150 #define FCP_RESP_RSP_INFO_LEN4    4 /* without reserved field */
151 #define FCP_RESP_RSP_INFO_LEN8    8 /* with reserved field */
152 
153 struct fcp_resp_with_ext {
154 	struct fcp_resp resp;
155 	struct fcp_resp_ext ext;
156 };
157 
158 #define	FCP_RESP_WITH_EXT   (FCP_RESP_LEN + FCP_RESP_EXT_LEN)
159 
160 /*
161  * fr_flags.
162  */
163 #define	FCP_BIDI_RSP	    0x80	/* bidirectional read response */
164 #define	FCP_BIDI_READ_UNDER 0x40	/* bidir. read less than requested */
165 #define	FCP_BIDI_READ_OVER  0x20	/* DL insufficient for full transfer */
166 #define	FCP_CONF_REQ	    0x10	/* confirmation requested */
167 #define	FCP_RESID_UNDER     0x08	/* transfer shorter than expected */
168 #define	FCP_RESID_OVER	    0x04	/* DL insufficient for full transfer */
169 #define	FCP_SNS_LEN_VAL     0x02	/* SNS_LEN field is valid */
170 #define	FCP_RSP_LEN_VAL     0x01	/* RSP_LEN field is valid */
171 
172 /*
173  * rsp_codes
174  */
175 enum fcp_resp_rsp_codes {
176 	FCP_TMF_CMPL = 0,
177 	FCP_DATA_LEN_INVALID = 1,
178 	FCP_CMND_FIELDS_INVALID = 2,
179 	FCP_DATA_PARAM_MISMATCH = 3,
180 	FCP_TMF_REJECTED = 4,
181 	FCP_TMF_FAILED = 5,
182 	FCP_TMF_INVALID_LUN = 9,
183 };
184 
185 /*
186  * FCP SRR Link Service request - Sequence Retransmission Request.
187  */
188 struct fcp_srr {
189 	__u8		srr_op;		/* opcode ELS_SRR */
190 	__u8		srr_resvd[3];	/* opcode / reserved - must be zero */
191 	__be16		srr_ox_id;	/* OX_ID of failed command */
192 	__be16		srr_rx_id;	/* RX_ID of failed command */
193 	__be32		srr_rel_off;	/* relative offset */
194 	__u8		srr_r_ctl;	/* r_ctl for the information unit */
195 	__u8		srr_resvd2[3];	/* reserved */
196 };
197 
198 /*
199  * Feature bits in name server FC-4 Features object.
200  */
201 #define	FCP_FEAT_TARG	(1 << 0)	/* target function supported */
202 #define	FCP_FEAT_INIT	(1 << 1)	/* initiator function supported */
203 
204 #endif /* _FC_FCP_H_ */
205