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TOMOYO Linux Cross Reference
Linux/include/scsi/fc/fc_fcp.h

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  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_FCP_H_
 21 #define _FC_FCP_H_
 22 
 23 #include <scsi/scsi.h>
 24 
 25 /*
 26  * Fibre Channel Protocol for SCSI.
 27  * From T10 FCP-3, T10 project 1560-D Rev 4, Sept. 13, 2005.
 28  */
 29 
 30 /*
 31  * fc/fs.h defines FC_TYPE_FCP.
 32  */
 33 
 34 /*
 35  * Service parameter page parameters (word 3 bits) for Process Login.
 36  */
 37 #define FCP_SPPF_TASK_RETRY_ID  0x0200  /* task retry ID requested */
 38 #define FCP_SPPF_RETRY          0x0100  /* retry supported */
 39 #define FCP_SPPF_CONF_COMPL     0x0080  /* confirmed completion allowed */
 40 #define FCP_SPPF_OVLY_ALLOW     0x0040  /* data overlay allowed */
 41 #define FCP_SPPF_INIT_FCN       0x0020  /* initiator function */
 42 #define FCP_SPPF_TARG_FCN       0x0010  /* target function */
 43 #define FCP_SPPF_RD_XRDY_DIS    0x0002  /* disable XFER_RDY for reads */
 44 #define FCP_SPPF_WR_XRDY_DIS    0x0001  /* disable XFER_RDY for writes */
 45 
 46 /*
 47  * FCP_CMND IU Payload.
 48  */
 49 struct fcp_cmnd {
 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[16];     /* base CDB */
 56         __be32          fc_dl;          /* data length (must follow fc_cdb) */
 57 };
 58 
 59 #define FCP_CMND_LEN    32      /* expected length of structure */
 60 
 61 struct fcp_cmnd32 {
 62         struct scsi_lun fc_lun;         /* logical unit number */
 63         __u8            fc_cmdref;      /* command reference number */
 64         __u8            fc_pri_ta;      /* priority and task attribute */
 65         __u8            fc_tm_flags;    /* task management flags */
 66         __u8            fc_flags;       /* additional len & flags */
 67         __u8            fc_cdb[32];     /* base CDB */
 68         __be32          fc_dl;          /* data length (must follow fc_cdb) */
 69 };
 70 
 71 #define FCP_CMND32_LEN      48  /* expected length of structure */
 72 #define FCP_CMND32_ADD_LEN  (16 / 4)    /* Additional cdb length */
 73 
 74 /*
 75  * fc_pri_ta.
 76  */
 77 #define FCP_PTA_SIMPLE      0   /* simple task attribute */
 78 #define FCP_PTA_HEADQ       1   /* head of queue task attribute */
 79 #define FCP_PTA_ORDERED     2   /* ordered task attribute */
 80 #define FCP_PTA_ACA         4   /* auto. contingent allegiance */
 81 #define FCP_PTA_MASK        7   /* mask for task attribute field */
 82 #define FCP_PRI_SHIFT       3   /* priority field starts in bit 3 */
 83 #define FCP_PRI_RESVD_MASK  0x80        /* reserved bits in priority field */
 84 
 85 /*
 86  * fc_tm_flags - task management flags field.
 87  */
 88 #define FCP_TMF_CLR_ACA         0x40    /* clear ACA condition */
 89 #define FCP_TMF_TGT_RESET       0x20    /* target reset task management,
 90                                            deprecated as of FCP-3 */
 91 #define FCP_TMF_LUN_RESET       0x10    /* logical unit reset task management */
 92 #define FCP_TMF_CLR_TASK_SET    0x04    /* clear task set */
 93 #define FCP_TMF_ABT_TASK_SET    0x02    /* abort task set */
 94 
 95 /*
 96  * fc_flags.
 97  *  Bits 7:2 are the additional FCP_CDB length / 4.
 98  */
 99 #define FCP_CFL_LEN_MASK        0xfc    /* mask for additional length */
100 #define FCP_CFL_LEN_SHIFT       2       /* shift bits for additional length */
101 #define FCP_CFL_RDDATA          0x02    /* read data */
102 #define FCP_CFL_WRDATA          0x01    /* write data */
103 
104 /*
105  * FCP_TXRDY IU - transfer ready payload.
106  */
107 struct fcp_txrdy {
108         __be32          ft_data_ro;     /* data relative offset */
109         __be32          ft_burst_len;   /* burst length */
110         __u8            _ft_resvd[4];   /* reserved */
111 };
112 
113 #define FCP_TXRDY_LEN   12      /* expected length of structure */
114 
115 /*
116  * FCP_RESP IU - response payload.
117  *
118  * The response payload comes in three parts: the flags/status, the
119  * sense/response lengths and the sense data/response info section.
120  *
121  * From FCP3r04, note 6 of section 9.5.13:
122  *
123  * Some early implementations presented the FCP_RSP IU without the FCP_RESID,
124  * FCP_SNS_LEN, and FCP_RSP_LEN fields if the FCP_RESID_UNDER, FCP_RESID_OVER,
125  * FCP_SNS_LEN_VALID, and FCP_RSP_LEN_VALID bits were all set to zero. This
126  * non-standard behavior should be tolerated.
127  *
128  * All response frames will always contain the fcp_resp template.  Some
129  * will also include the fcp_resp_len template.
130  *
131  * From Table 23, the FCP_RSP_INFO can either be 4 bytes or 8 bytes, both
132  * are valid length.
133  */
134 struct fcp_resp {
135         __u8            _fr_resvd[8];   /* reserved */
136         __be16          fr_retry_delay; /* retry delay timer */
137         __u8            fr_flags;       /* flags */
138         __u8            fr_status;      /* SCSI status code */
139 };
140 
141 #define FCP_RESP_LEN    12      /* expected length of structure */
142 
143 struct fcp_resp_ext {
144         __be32          fr_resid;       /* Residual value */
145         __be32          fr_sns_len;     /* SCSI Sense length */
146         __be32          fr_rsp_len;     /* Response Info length */
147 
148         /*
149          * Optionally followed by RSP info and/or SNS info and/or
150          * bidirectional read residual length, if any.
151          */
152 };
153 
154 #define FCP_RESP_EXT_LEN    12  /* expected length of the structure */
155 
156 struct fcp_resp_rsp_info {
157     __u8      _fr_resvd[3];       /* reserved */
158     __u8      rsp_code;           /* Response Info Code */
159     __u8      _fr_resvd2[4];      /* reserved */
160 };
161 
162 #define FCP_RESP_RSP_INFO_LEN4    4 /* without reserved field */
163 #define FCP_RESP_RSP_INFO_LEN8    8 /* with reserved field */
164 
165 struct fcp_resp_with_ext {
166         struct fcp_resp resp;
167         struct fcp_resp_ext ext;
168 };
169 
170 #define FCP_RESP_WITH_EXT   (FCP_RESP_LEN + FCP_RESP_EXT_LEN)
171 
172 /*
173  * fr_flags.
174  */
175 #define FCP_BIDI_RSP        0x80        /* bidirectional read response */
176 #define FCP_BIDI_READ_UNDER 0x40        /* bidir. read less than requested */
177 #define FCP_BIDI_READ_OVER  0x20        /* DL insufficient for full transfer */
178 #define FCP_CONF_REQ        0x10        /* confirmation requested */
179 #define FCP_RESID_UNDER     0x08        /* transfer shorter than expected */
180 #define FCP_RESID_OVER      0x04        /* DL insufficient for full transfer */
181 #define FCP_SNS_LEN_VAL     0x02        /* SNS_LEN field is valid */
182 #define FCP_RSP_LEN_VAL     0x01        /* RSP_LEN field is valid */
183 
184 /*
185  * rsp_codes
186  */
187 enum fcp_resp_rsp_codes {
188         FCP_TMF_CMPL = 0,
189         FCP_DATA_LEN_INVALID = 1,
190         FCP_CMND_FIELDS_INVALID = 2,
191         FCP_DATA_PARAM_MISMATCH = 3,
192         FCP_TMF_REJECTED = 4,
193         FCP_TMF_FAILED = 5,
194         FCP_TMF_INVALID_LUN = 9,
195 };
196 
197 /*
198  * FCP SRR Link Service request - Sequence Retransmission Request.
199  */
200 struct fcp_srr {
201         __u8            srr_op;         /* opcode ELS_SRR */
202         __u8            srr_resvd[3];   /* opcode / reserved - must be zero */
203         __be16          srr_ox_id;      /* OX_ID of failed command */
204         __be16          srr_rx_id;      /* RX_ID of failed command */
205         __be32          srr_rel_off;    /* relative offset */
206         __u8            srr_r_ctl;      /* r_ctl for the information unit */
207         __u8            srr_resvd2[3];  /* reserved */
208 };
209 
210 /*
211  * Feature bits in name server FC-4 Features object.
212  */
213 #define FCP_FEAT_TARG   (1 << 0)        /* target function supported */
214 #define FCP_FEAT_INIT   (1 << 1)        /* initiator function supported */
215 
216 #endif /* _FC_FCP_H_ */
217 

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