xref: /openbmc/linux/drivers/s390/scsi/zfcp_fc.h (revision 781a7dab)
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  * @opened: Wait for completion of open command
189  * @closed: Wait for completion of close command
190  * @status: Current status of WKA port
191  * @refcount: Reference count to keep port open as long as it is in use
192  * @d_id: FC destination id or well-known-address
193  * @handle: FSF handle for the open WKA port
194  * @mutex: Mutex used during opening/closing state changes
195  * @work: For delaying the closing of the WKA port
196  */
197 struct zfcp_fc_wka_port {
198 	struct zfcp_adapter	*adapter;
199 	wait_queue_head_t	opened;
200 	wait_queue_head_t	closed;
201 	enum zfcp_fc_wka_status	status;
202 	atomic_t		refcount;
203 	u32			d_id;
204 	u32			handle;
205 	struct mutex		mutex;
206 	struct delayed_work	work;
207 };
208 
209 /**
210  * struct zfcp_fc_wka_ports - Data structures for FC generic services
211  * @ms: FC Management service
212  * @ts: FC time service
213  * @ds: FC directory service
214  * @as: FC alias service
215  */
216 struct zfcp_fc_wka_ports {
217 	struct zfcp_fc_wka_port ms;
218 	struct zfcp_fc_wka_port ts;
219 	struct zfcp_fc_wka_port ds;
220 	struct zfcp_fc_wka_port as;
221 };
222 
223 /**
224  * zfcp_fc_scsi_to_fcp - setup FCP command with data from scsi_cmnd
225  * @fcp: fcp_cmnd to setup
226  * @scsi: scsi_cmnd where to get LUN, task attributes/flags and CDB
227  */
228 static inline
zfcp_fc_scsi_to_fcp(struct fcp_cmnd * fcp,struct scsi_cmnd * scsi)229 void zfcp_fc_scsi_to_fcp(struct fcp_cmnd *fcp, struct scsi_cmnd *scsi)
230 {
231 	u32 datalen;
232 
233 	int_to_scsilun(scsi->device->lun, (struct scsi_lun *) &fcp->fc_lun);
234 
235 	fcp->fc_pri_ta = FCP_PTA_SIMPLE;
236 
237 	if (scsi->sc_data_direction == DMA_FROM_DEVICE)
238 		fcp->fc_flags |= FCP_CFL_RDDATA;
239 	if (scsi->sc_data_direction == DMA_TO_DEVICE)
240 		fcp->fc_flags |= FCP_CFL_WRDATA;
241 
242 	memcpy(fcp->fc_cdb, scsi->cmnd, scsi->cmd_len);
243 
244 	datalen = scsi_bufflen(scsi);
245 	fcp->fc_dl = cpu_to_be32(datalen);
246 
247 	if (scsi_get_prot_type(scsi) == SCSI_PROT_DIF_TYPE1) {
248 		datalen += datalen / scsi->device->sector_size * 8;
249 		fcp->fc_dl = cpu_to_be32(datalen);
250 	}
251 }
252 
253 /**
254  * zfcp_fc_fcp_tm() - Setup FCP command as task management command.
255  * @fcp: Pointer to FCP_CMND IU to set up.
256  * @dev: Pointer to SCSI_device where to send the task management command.
257  * @tm_flags: Task management flags to setup tm command.
258  */
259 static inline
zfcp_fc_fcp_tm(struct fcp_cmnd * fcp,struct scsi_device * dev,u8 tm_flags)260 void zfcp_fc_fcp_tm(struct fcp_cmnd *fcp, struct scsi_device *dev, u8 tm_flags)
261 {
262 	int_to_scsilun(dev->lun, (struct scsi_lun *) &fcp->fc_lun);
263 	fcp->fc_tm_flags = tm_flags;
264 }
265 
266 /**
267  * zfcp_fc_evap_fcp_rsp - evaluate FCP RSP IU and update scsi_cmnd accordingly
268  * @fcp_rsp: FCP RSP IU to evaluate
269  * @scsi: SCSI command where to update status and sense buffer
270  */
271 static inline
zfcp_fc_eval_fcp_rsp(struct fcp_resp_with_ext * fcp_rsp,struct scsi_cmnd * scsi)272 void zfcp_fc_eval_fcp_rsp(struct fcp_resp_with_ext *fcp_rsp,
273 			  struct scsi_cmnd *scsi)
274 {
275 	struct fcp_resp_rsp_info *rsp_info;
276 	char *sense;
277 	u32 sense_len, resid;
278 	u8 rsp_flags;
279 
280 	scsi->result |= fcp_rsp->resp.fr_status;
281 
282 	rsp_flags = fcp_rsp->resp.fr_flags;
283 
284 	if (unlikely(rsp_flags & FCP_RSP_LEN_VAL)) {
285 		rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
286 		if (rsp_info->rsp_code == FCP_TMF_CMPL)
287 			set_host_byte(scsi, DID_OK);
288 		else {
289 			set_host_byte(scsi, DID_ERROR);
290 			return;
291 		}
292 	}
293 
294 	if (unlikely(rsp_flags & FCP_SNS_LEN_VAL)) {
295 		sense = (char *) &fcp_rsp[1];
296 		if (rsp_flags & FCP_RSP_LEN_VAL)
297 			sense += be32_to_cpu(fcp_rsp->ext.fr_rsp_len);
298 		sense_len = min_t(u32, be32_to_cpu(fcp_rsp->ext.fr_sns_len),
299 				  SCSI_SENSE_BUFFERSIZE);
300 		memcpy(scsi->sense_buffer, sense, sense_len);
301 	}
302 
303 	if (unlikely(rsp_flags & FCP_RESID_UNDER)) {
304 		resid = be32_to_cpu(fcp_rsp->ext.fr_resid);
305 		scsi_set_resid(scsi, resid);
306 		if (scsi_bufflen(scsi) - resid < scsi->underflow &&
307 		     !(rsp_flags & FCP_SNS_LEN_VAL) &&
308 		     fcp_rsp->resp.fr_status == SAM_STAT_GOOD)
309 			set_host_byte(scsi, DID_ERROR);
310 	} else if (unlikely(rsp_flags & FCP_RESID_OVER)) {
311 		/* FCP_DL was not sufficient for SCSI data length */
312 		if (fcp_rsp->resp.fr_status == SAM_STAT_GOOD)
313 			set_host_byte(scsi, DID_ERROR);
314 	}
315 }
316 
317 #endif
318