2 * FC Transport BSG Interface
4 * Copyright (C) 2008 James Smart, Emulex Corporation
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 * This file intended to be included by both kernel and user space
30 * FC Transport SGIO v4 BSG Message Support
33 /* Default BSG request timeout (in seconds) */
34 #define FC_DEFAULT_BSG_TIMEOUT (10 * HZ)
38 * Request Message Codes supported by the FC Transport
41 /* define the class masks for the message codes */
42 #define FC_BSG_CLS_MASK 0xF0000000 /* find object class */
43 #define FC_BSG_HST_MASK 0x80000000 /* fc host class */
44 #define FC_BSG_RPT_MASK 0x40000000 /* fc rport class */
46 /* fc_host Message Codes */
47 #define FC_BSG_HST_ADD_RPORT (FC_BSG_HST_MASK | 0x00000001)
48 #define FC_BSG_HST_DEL_RPORT (FC_BSG_HST_MASK | 0x00000002)
49 #define FC_BSG_HST_ELS_NOLOGIN (FC_BSG_HST_MASK | 0x00000003)
50 #define FC_BSG_HST_CT (FC_BSG_HST_MASK | 0x00000004)
51 #define FC_BSG_HST_VENDOR (FC_BSG_HST_MASK | 0x000000FF)
53 /* fc_rport Message Codes */
54 #define FC_BSG_RPT_ELS (FC_BSG_RPT_MASK | 0x00000001)
55 #define FC_BSG_RPT_CT (FC_BSG_RPT_MASK | 0x00000002)
60 * FC Address Identifiers in Message Structures :
62 * Whenever a command payload contains a FC Address Identifier
63 * (aka port_id), the value is effectively in big-endian
64 * order, thus the array elements are decoded as follows:
65 * element [0] is bits 23:16 of the FC Address Identifier
66 * element [1] is bits 15:8 of the FC Address Identifier
67 * element [2] is bits 7:0 of the FC Address Identifier
75 /* FC_BSG_HST_ADDR_PORT : */
78 * This message requests the FC host to login to the remote port
79 * at the specified N_Port_Id. The remote port is to be enumerated
80 * with the transport upon completion of the login.
82 struct fc_bsg_host_add_rport {
85 /* FC Address Identier of the remote port to login to */
90 * There is no additional response data - fc_bsg_reply->result is sufficient
94 /* FC_BSG_HST_DEL_RPORT : */
97 * This message requests the FC host to remove an enumerated
98 * remote port and to terminate the login to it.
100 * Note: The driver is free to reject this request if it desires to
101 * remain logged in with the remote port.
103 struct fc_bsg_host_del_rport {
106 /* FC Address Identier of the remote port to logout of */
111 * There is no additional response data - fc_bsg_reply->result is sufficient
115 /* FC_BSG_HST_ELS_NOLOGIN : */
118 * This message requests the FC_Host to send an ELS to a specific
119 * N_Port_ID. The host does not need to log into the remote port,
120 * nor does it need to enumerate the rport for further traffic
121 * (although, the FC host is free to do so if it desires).
123 struct fc_bsg_host_els {
125 * ELS Command Code being sent (must be the same as byte 0
128 uint8_t command_code;
130 /* FC Address Identier of the remote port to send the ELS to */
136 /* fc_bsg_ctels_reply->status values */
137 #define FC_CTELS_STATUS_OK 0x00000000
138 #define FC_CTELS_STATUS_REJECT 0x00000001
139 #define FC_CTELS_STATUS_P_RJT 0x00000002
140 #define FC_CTELS_STATUS_F_RJT 0x00000003
141 #define FC_CTELS_STATUS_P_BSY 0x00000004
142 #define FC_CTELS_STATUS_F_BSY 0x00000006
143 struct fc_bsg_ctels_reply {
145 * Note: An ELS LS_RJT may be reported in 2 ways:
146 * a) A status of FC_CTELS_STATUS_OK is returned. The caller
147 * is to look into the ELS receive payload to determine
148 * LS_ACC or LS_RJT (by contents of word 0). The reject
149 * data will be in word 1.
150 * b) A status of FC_CTELS_STATUS_REJECT is returned, The
151 * rjt_data field will contain valid data.
153 * Note: ELS LS_ACC is determined by an FC_CTELS_STATUS_OK, and
154 * the receive payload word 0 indicates LS_ACC
155 * (e.g. value is 0x02xxxxxx).
157 * Note: Similarly, a CT Reject may be reported in 2 ways:
158 * a) A status of FC_CTELS_STATUS_OK is returned. The caller
159 * is to look into the CT receive payload to determine
160 * Accept or Reject (by contents of word 2). The reject
161 * data will be in word 3.
162 * b) A status of FC_CTELS_STATUS_REJECT is returned, The
163 * rjt_data field will contain valid data.
165 * Note: x_RJT/BSY status will indicae that the rjt_data field
166 * is valid and contains the reason/explanation values.
168 uint32_t status; /* See FC_CTELS_STATUS_xxx */
170 /* valid if status is not FC_CTELS_STATUS_OK */
172 uint8_t action; /* fragment_id for CT REJECT */
174 uint8_t reason_explanation;
175 uint8_t vendor_unique;
180 /* FC_BSG_HST_CT : */
183 * This message requests that a CT Request be performed with the
184 * indicated N_Port_ID. The driver is responsible for logging in with
185 * the fabric and/or N_Port_ID, etc as per FC rules. This request does
186 * not mandate that the driver must enumerate the destination in the
187 * transport. The driver is allowed to decide whether to enumerate it,
188 * and whether to tear it down after the request.
190 struct fc_bsg_host_ct {
193 /* FC Address Identier of the remote port to send the ELS to */
197 * We need words 0-2 of the generic preamble for the LLD's
199 uint32_t preamble_word0; /* revision & IN_ID */
200 uint32_t preamble_word1; /* GS_Type, GS_SubType, Options, Rsvd */
201 uint32_t preamble_word2; /* Cmd Code, Max Size */
206 * The reply structure is an fc_bsg_ctels_reply structure
210 /* FC_BSG_HST_VENDOR : */
213 * Note: When specifying vendor_id, be sure to read the Vendor Type and ID
214 * formatting requirements specified in scsi_netlink.h
216 struct fc_bsg_host_vendor {
218 * Identifies the vendor that the message is formatted for. This
219 * should be the recipient of the message.
223 /* start of vendor command area */
224 uint32_t vendor_cmd[0];
229 struct fc_bsg_host_vendor_reply {
230 /* start of vendor response area */
231 uint32_t vendor_rsp[0];
237 * FC Remote Port Messages
240 /* FC_BSG_RPT_ELS : */
243 * This message requests that an ELS be performed with the rport.
245 struct fc_bsg_rport_els {
247 * ELS Command Code being sent (must be the same as
248 * byte 0 of the payload)
255 * The reply structure is an fc_bsg_ctels_reply structure
259 /* FC_BSG_RPT_CT : */
262 * This message requests that a CT Request be performed with the rport.
264 struct fc_bsg_rport_ct {
266 * We need words 0-2 of the generic preamble for the LLD's
268 uint32_t preamble_word0; /* revision & IN_ID */
269 uint32_t preamble_word1; /* GS_Type, GS_SubType, Options, Rsvd */
270 uint32_t preamble_word2; /* Cmd Code, Max Size */
274 * The reply structure is an fc_bsg_ctels_reply structure
280 /* request (CDB) structure of the sg_io_v4 */
281 struct fc_bsg_request {
284 struct fc_bsg_host_add_rport h_addrport;
285 struct fc_bsg_host_del_rport h_delrport;
286 struct fc_bsg_host_els h_els;
287 struct fc_bsg_host_ct h_ct;
288 struct fc_bsg_host_vendor h_vendor;
290 struct fc_bsg_rport_els r_els;
291 struct fc_bsg_rport_ct r_ct;
293 } __attribute__((packed));
296 /* response (request sense data) structure of the sg_io_v4 */
297 struct fc_bsg_reply {
299 * The completion result. Result exists in two forms:
300 * if negative, it is an -Exxx system errno value. There will
301 * be no further reply information supplied.
302 * else, it's the 4-byte scsi error result, with driver, host,
303 * msg and status fields. The per-msgcode reply structure
304 * will contain valid data.
308 /* If there was reply_payload, how much was recevied ? */
309 uint32_t reply_payload_rcv_len;
312 struct fc_bsg_host_vendor_reply vendor_reply;
314 struct fc_bsg_ctels_reply ctels_reply;
319 #endif /* SCSI_BSG_FC_H */