1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * zfcp device driver
4 *
5 * Fibre Channel related definitions and inline functions for the zfcp
6 * device driver
7 *
8 * Copyright IBM Corp. 2009, 2017
9 */
10
11 #ifndef ZFCP_FC_H
12 #define ZFCP_FC_H
13
14 #include <scsi/fc/fc_els.h>
15 #include <scsi/fc/fc_fcp.h>
16 #include <scsi/fc/fc_ns.h>
17 #include <scsi/scsi_cmnd.h>
18 #include <scsi/scsi_tcq.h>
19 #include "zfcp_fsf.h"
20
21 #define ZFCP_FC_CT_SIZE_PAGE (PAGE_SIZE - sizeof(struct fc_ct_hdr))
22 #define ZFCP_FC_GPN_FT_ENT_PAGE (ZFCP_FC_CT_SIZE_PAGE \
23 / sizeof(struct fc_gpn_ft_resp))
24 #define ZFCP_FC_GPN_FT_NUM_BUFS 4 /* memory pages */
25
26 #define ZFCP_FC_GPN_FT_MAX_SIZE (ZFCP_FC_GPN_FT_NUM_BUFS * PAGE_SIZE \
27 - sizeof(struct fc_ct_hdr))
28 #define ZFCP_FC_GPN_FT_MAX_ENT (ZFCP_FC_GPN_FT_NUM_BUFS * \
29 (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
30
31 #define ZFCP_FC_CTELS_TMO (2 * FC_DEF_R_A_TOV / 1000)
32
33 /**
34 * struct zfcp_fc_event - FC HBAAPI event for internal queueing from irq context
35 * @code: Event code
36 * @data: Event data
37 * @list: list_head for zfcp_fc_events list
38 */
39 struct zfcp_fc_event {
40 enum fc_host_event_code code;
41 u32 data;
42 struct list_head list;
43 };
44
45 /**
46 * struct zfcp_fc_events - Infrastructure for posting FC events from irq context
47 * @list: List for queueing of events from irq context to workqueue
48 * @list_lock: Lock for event list
49 * @work: work_struct for forwarding events in workqueue
50 */
51 struct zfcp_fc_events {
52 struct list_head list;
53 spinlock_t list_lock;
54 struct work_struct work;
55 };
56
57 /**
58 * struct zfcp_fc_gid_pn_req - container for ct header plus gid_pn request
59 * @ct_hdr: FC GS common transport header
60 * @gid_pn: GID_PN request
61 */
62 struct zfcp_fc_gid_pn_req {
63 struct fc_ct_hdr ct_hdr;
64 struct fc_ns_gid_pn gid_pn;
65 } __packed;
66
67 /**
68 * struct zfcp_fc_gid_pn_rsp - container for ct header plus gid_pn response
69 * @ct_hdr: FC GS common transport header
70 * @gid_pn: GID_PN response
71 */
72 struct zfcp_fc_gid_pn_rsp {
73 struct fc_ct_hdr ct_hdr;
74 struct fc_gid_pn_resp gid_pn;
75 } __packed;
76
77 /**
78 * struct zfcp_fc_gpn_ft - container for ct header plus gpn_ft request
79 * @ct_hdr: FC GS common transport header
80 * @gpn_ft: GPN_FT request
81 */
82 struct zfcp_fc_gpn_ft_req {
83 struct fc_ct_hdr ct_hdr;
84 struct fc_ns_gid_ft gpn_ft;
85 } __packed;
86
87 /**
88 * struct zfcp_fc_gspn_req - container for ct header plus GSPN_ID request
89 * @ct_hdr: FC GS common transport header
90 * @gspn: GSPN_ID request
91 */
92 struct zfcp_fc_gspn_req {
93 struct fc_ct_hdr ct_hdr;
94 struct fc_gid_pn_resp gspn;
95 } __packed;
96
97 /**
98 * struct zfcp_fc_gspn_rsp - container for ct header plus GSPN_ID response
99 * @ct_hdr: FC GS common transport header
100 * @gspn: GSPN_ID response
101 * @name: The name string of the GSPN_ID response
102 */
103 struct zfcp_fc_gspn_rsp {
104 struct fc_ct_hdr ct_hdr;
105 struct fc_gspn_resp gspn;
106 char name[FC_SYMBOLIC_NAME_SIZE];
107 } __packed;
108
109 /**
110 * struct zfcp_fc_rspn_req - container for ct header plus RSPN_ID request
111 * @ct_hdr: FC GS common transport header
112 * @rspn: RSPN_ID request
113 * @name: The name string of the RSPN_ID request
114 */
115 struct zfcp_fc_rspn_req {
116 struct fc_ct_hdr ct_hdr;
117 struct fc_ns_rspn rspn;
118 char name[FC_SYMBOLIC_NAME_SIZE];
119 } __packed;
120
121 /**
122 * struct zfcp_fc_req - Container for FC ELS and CT requests sent from zfcp
123 * @ct_els: data required for issuing fsf command
124 * @sg_req: scatterlist entry for request data, refers to embedded @u submember
125 * @sg_rsp: scatterlist entry for response data, refers to embedded @u submember
126 * @u: request and response specific data
127 * @u.adisc: ADISC specific data
128 * @u.adisc.req: ADISC request
129 * @u.adisc.rsp: ADISC response
130 * @u.gid_pn: GID_PN specific data
131 * @u.gid_pn.req: GID_PN request
132 * @u.gid_pn.rsp: GID_PN response
133 * @u.gpn_ft: GPN_FT specific data
134 * @u.gpn_ft.sg_rsp2: GPN_FT response, not embedded here, allocated elsewhere
135 * @u.gpn_ft.req: GPN_FT request
136 * @u.gspn: GSPN specific data
137 * @u.gspn.req: GSPN request
138 * @u.gspn.rsp: GSPN response
139 * @u.rspn: RSPN specific data
140 * @u.rspn.req: RSPN request
141 * @u.rspn.rsp: RSPN response
142 */
143 struct zfcp_fc_req {
144 struct zfcp_fsf_ct_els ct_els;
145 struct scatterlist sg_req;
146 struct scatterlist sg_rsp;
147 union {
148 struct {
149 struct fc_els_adisc req;
150 struct fc_els_adisc rsp;
151 } adisc;
152 struct {
153 struct zfcp_fc_gid_pn_req req;
154 struct zfcp_fc_gid_pn_rsp rsp;
155 } gid_pn;
156 struct {
157 struct scatterlist sg_rsp2[ZFCP_FC_GPN_FT_NUM_BUFS - 1];
158 struct zfcp_fc_gpn_ft_req req;
159 } gpn_ft;
160 struct {
161 struct zfcp_fc_gspn_req req;
162 struct zfcp_fc_gspn_rsp rsp;
163 } gspn;
164 struct {
165 struct zfcp_fc_rspn_req req;
166 struct fc_ct_hdr rsp;
167 } rspn;
168 } u;
169 };
170
171 /**
172 * enum zfcp_fc_wka_status - FC WKA port status in zfcp
173 * @ZFCP_FC_WKA_PORT_OFFLINE: Port is closed and not in use
174 * @ZFCP_FC_WKA_PORT_CLOSING: The FSF "close port" request is pending
175 * @ZFCP_FC_WKA_PORT_OPENING: The FSF "open port" request is pending
176 * @ZFCP_FC_WKA_PORT_ONLINE: The port is open and the port handle is valid
177 */
178 enum zfcp_fc_wka_status {
179 ZFCP_FC_WKA_PORT_OFFLINE,
180 ZFCP_FC_WKA_PORT_CLOSING,
181 ZFCP_FC_WKA_PORT_OPENING,
182 ZFCP_FC_WKA_PORT_ONLINE,
183 };
184
185 /**
186 * struct zfcp_fc_wka_port - representation of well-known-address (WKA) FC port
187 * @adapter: Pointer to adapter structure this WKA port belongs to
188 * @completion_wq: Wait for completion of open/close command
189 * @status: Current status of WKA port
190 * @refcount: Reference count to keep port open as long as it is in use
191 * @d_id: FC destination id or well-known-address
192 * @handle: FSF handle for the open WKA port
193 * @mutex: Mutex used during opening/closing state changes
194 * @work: For delaying the closing of the WKA port
195 */
196 struct zfcp_fc_wka_port {
197 struct zfcp_adapter *adapter;
198 wait_queue_head_t completion_wq;
199 enum zfcp_fc_wka_status status;
200 atomic_t refcount;
201 u32 d_id;
202 u32 handle;
203 struct mutex mutex;
204 struct delayed_work work;
205 };
206
207 /**
208 * struct zfcp_fc_wka_ports - Data structures for FC generic services
209 * @ms: FC Management service
210 * @ts: FC time service
211 * @ds: FC directory service
212 * @as: FC alias service
213 */
214 struct zfcp_fc_wka_ports {
215 struct zfcp_fc_wka_port ms;
216 struct zfcp_fc_wka_port ts;
217 struct zfcp_fc_wka_port ds;
218 struct zfcp_fc_wka_port as;
219 };
220
221 /**
222 * zfcp_fc_scsi_to_fcp - setup FCP command with data from scsi_cmnd
223 * @fcp: fcp_cmnd to setup
224 * @scsi: scsi_cmnd where to get LUN, task attributes/flags and CDB
225 */
226 static inline
zfcp_fc_scsi_to_fcp(struct fcp_cmnd * fcp,struct scsi_cmnd * scsi)227 void zfcp_fc_scsi_to_fcp(struct fcp_cmnd *fcp, struct scsi_cmnd *scsi)
228 {
229 u32 datalen;
230
231 int_to_scsilun(scsi->device->lun, (struct scsi_lun *) &fcp->fc_lun);
232
233 fcp->fc_pri_ta = FCP_PTA_SIMPLE;
234
235 if (scsi->sc_data_direction == DMA_FROM_DEVICE)
236 fcp->fc_flags |= FCP_CFL_RDDATA;
237 if (scsi->sc_data_direction == DMA_TO_DEVICE)
238 fcp->fc_flags |= FCP_CFL_WRDATA;
239
240 memcpy(fcp->fc_cdb, scsi->cmnd, scsi->cmd_len);
241
242 datalen = scsi_bufflen(scsi);
243 fcp->fc_dl = cpu_to_be32(datalen);
244
245 if (scsi_get_prot_type(scsi) == SCSI_PROT_DIF_TYPE1) {
246 datalen += datalen / scsi->device->sector_size * 8;
247 fcp->fc_dl = cpu_to_be32(datalen);
248 }
249 }
250
251 /**
252 * zfcp_fc_fcp_tm() - Setup FCP command as task management command.
253 * @fcp: Pointer to FCP_CMND IU to set up.
254 * @dev: Pointer to SCSI_device where to send the task management command.
255 * @tm_flags: Task management flags to setup tm command.
256 */
257 static inline
zfcp_fc_fcp_tm(struct fcp_cmnd * fcp,struct scsi_device * dev,u8 tm_flags)258 void zfcp_fc_fcp_tm(struct fcp_cmnd *fcp, struct scsi_device *dev, u8 tm_flags)
259 {
260 int_to_scsilun(dev->lun, (struct scsi_lun *) &fcp->fc_lun);
261 fcp->fc_tm_flags = tm_flags;
262 }
263
264 /**
265 * zfcp_fc_evap_fcp_rsp - evaluate FCP RSP IU and update scsi_cmnd accordingly
266 * @fcp_rsp: FCP RSP IU to evaluate
267 * @scsi: SCSI command where to update status and sense buffer
268 */
269 static inline
zfcp_fc_eval_fcp_rsp(struct fcp_resp_with_ext * fcp_rsp,struct scsi_cmnd * scsi)270 void zfcp_fc_eval_fcp_rsp(struct fcp_resp_with_ext *fcp_rsp,
271 struct scsi_cmnd *scsi)
272 {
273 struct fcp_resp_rsp_info *rsp_info;
274 char *sense;
275 u32 sense_len, resid;
276 u8 rsp_flags;
277
278 set_msg_byte(scsi, COMMAND_COMPLETE);
279 scsi->result |= fcp_rsp->resp.fr_status;
280
281 rsp_flags = fcp_rsp->resp.fr_flags;
282
283 if (unlikely(rsp_flags & FCP_RSP_LEN_VAL)) {
284 rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
285 if (rsp_info->rsp_code == FCP_TMF_CMPL)
286 set_host_byte(scsi, DID_OK);
287 else {
288 set_host_byte(scsi, DID_ERROR);
289 return;
290 }
291 }
292
293 if (unlikely(rsp_flags & FCP_SNS_LEN_VAL)) {
294 sense = (char *) &fcp_rsp[1];
295 if (rsp_flags & FCP_RSP_LEN_VAL)
296 sense += be32_to_cpu(fcp_rsp->ext.fr_rsp_len);
297 sense_len = min_t(u32, be32_to_cpu(fcp_rsp->ext.fr_sns_len),
298 SCSI_SENSE_BUFFERSIZE);
299 memcpy(scsi->sense_buffer, sense, sense_len);
300 }
301
302 if (unlikely(rsp_flags & FCP_RESID_UNDER)) {
303 resid = be32_to_cpu(fcp_rsp->ext.fr_resid);
304 scsi_set_resid(scsi, resid);
305 if (scsi_bufflen(scsi) - resid < scsi->underflow &&
306 !(rsp_flags & FCP_SNS_LEN_VAL) &&
307 fcp_rsp->resp.fr_status == SAM_STAT_GOOD)
308 set_host_byte(scsi, DID_ERROR);
309 } else if (unlikely(rsp_flags & FCP_RESID_OVER)) {
310 /* FCP_DL was not sufficient for SCSI data length */
311 if (fcp_rsp->resp.fr_status == SAM_STAT_GOOD)
312 set_host_byte(scsi, DID_ERROR);
313 }
314 }
315
316 #endif
317
