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3699d92a KP |
1 | /* |
2 | * Copyright (c) 2010 Cisco Systems, Inc. | |
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 | ||
18 | /* XXX TBD some includes may be extraneous */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/moduleparam.h> | |
3699d92a KP |
22 | #include <generated/utsrelease.h> |
23 | #include <linux/utsname.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/kthread.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/configfs.h> | |
30 | #include <linux/ctype.h> | |
31 | #include <linux/hash.h> | |
32 | #include <asm/unaligned.h> | |
33 | #include <scsi/scsi.h> | |
34 | #include <scsi/scsi_host.h> | |
35 | #include <scsi/scsi_device.h> | |
36 | #include <scsi/scsi_cmnd.h> | |
61db1802 | 37 | #include <scsi/scsi_tcq.h> |
3699d92a KP |
38 | #include <scsi/libfc.h> |
39 | #include <scsi/fc_encode.h> | |
40 | ||
41 | #include <target/target_core_base.h> | |
42 | #include <target/target_core_transport.h> | |
43 | #include <target/target_core_fabric_ops.h> | |
44 | #include <target/target_core_device.h> | |
45 | #include <target/target_core_tpg.h> | |
46 | #include <target/target_core_configfs.h> | |
3699d92a KP |
47 | #include <target/target_core_tmr.h> |
48 | #include <target/configfs_macros.h> | |
49 | ||
50 | #include "tcm_fc.h" | |
51 | ||
52 | /* | |
53 | * Dump cmd state for debugging. | |
54 | */ | |
55 | void ft_dump_cmd(struct ft_cmd *cmd, const char *caller) | |
56 | { | |
57 | struct fc_exch *ep; | |
58 | struct fc_seq *sp; | |
59 | struct se_cmd *se_cmd; | |
ec98f782 AG |
60 | struct scatterlist *sg; |
61 | int count; | |
3699d92a | 62 | |
3699d92a | 63 | se_cmd = &cmd->se_cmd; |
58fc73d1 CH |
64 | pr_debug("%s: cmd %p sess %p seq %p se_cmd %p\n", |
65 | caller, cmd, cmd->sess, cmd->seq, se_cmd); | |
6708bb27 | 66 | pr_debug("%s: cmd %p cdb %p\n", |
3699d92a | 67 | caller, cmd, cmd->cdb); |
6708bb27 | 68 | pr_debug("%s: cmd %p lun %d\n", caller, cmd, cmd->lun); |
3699d92a | 69 | |
6708bb27 | 70 | pr_debug("%s: cmd %p data_nents %u len %u se_cmd_flags <0x%x>\n", |
ec98f782 | 71 | caller, cmd, se_cmd->t_data_nents, |
05d1c7c0 | 72 | se_cmd->data_length, se_cmd->se_cmd_flags); |
5951146d | 73 | |
ec98f782 | 74 | for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, count) |
6708bb27 | 75 | pr_debug("%s: cmd %p sg %p page %p " |
ec98f782 AG |
76 | "len 0x%x off 0x%x\n", |
77 | caller, cmd, sg, | |
78 | sg_page(sg), sg->length, sg->offset); | |
79 | ||
3699d92a KP |
80 | sp = cmd->seq; |
81 | if (sp) { | |
82 | ep = fc_seq_exch(sp); | |
6708bb27 | 83 | pr_debug("%s: cmd %p sid %x did %x " |
3699d92a KP |
84 | "ox_id %x rx_id %x seq_id %x e_stat %x\n", |
85 | caller, cmd, ep->sid, ep->did, ep->oxid, ep->rxid, | |
86 | sp->id, ep->esb_stat); | |
87 | } | |
88 | print_hex_dump(KERN_INFO, "ft_dump_cmd ", DUMP_PREFIX_NONE, | |
89 | 16, 4, cmd->cdb, MAX_COMMAND_SIZE, 0); | |
90 | } | |
91 | ||
3699d92a KP |
92 | static void ft_free_cmd(struct ft_cmd *cmd) |
93 | { | |
94 | struct fc_frame *fp; | |
95 | struct fc_lport *lport; | |
96 | ||
97 | if (!cmd) | |
98 | return; | |
99 | fp = cmd->req_frame; | |
100 | lport = fr_dev(fp); | |
101 | if (fr_seq(fp)) | |
102 | lport->tt.seq_release(fr_seq(fp)); | |
103 | fc_frame_free(fp); | |
104 | ft_sess_put(cmd->sess); /* undo get from lookup at recv */ | |
105 | kfree(cmd); | |
106 | } | |
107 | ||
108 | void ft_release_cmd(struct se_cmd *se_cmd) | |
109 | { | |
110 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
111 | ||
112 | ft_free_cmd(cmd); | |
113 | } | |
114 | ||
115 | void ft_check_stop_free(struct se_cmd *se_cmd) | |
116 | { | |
82f1c8a4 | 117 | transport_generic_free_cmd(se_cmd, 0); |
3699d92a KP |
118 | } |
119 | ||
120 | /* | |
121 | * Send response. | |
122 | */ | |
123 | int ft_queue_status(struct se_cmd *se_cmd) | |
124 | { | |
125 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
126 | struct fc_frame *fp; | |
127 | struct fcp_resp_with_ext *fcp; | |
128 | struct fc_lport *lport; | |
129 | struct fc_exch *ep; | |
130 | size_t len; | |
131 | ||
132 | ft_dump_cmd(cmd, __func__); | |
133 | ep = fc_seq_exch(cmd->seq); | |
134 | lport = ep->lp; | |
135 | len = sizeof(*fcp) + se_cmd->scsi_sense_length; | |
136 | fp = fc_frame_alloc(lport, len); | |
137 | if (!fp) { | |
138 | /* XXX shouldn't just drop it - requeue and retry? */ | |
139 | return 0; | |
140 | } | |
141 | fcp = fc_frame_payload_get(fp, len); | |
142 | memset(fcp, 0, len); | |
143 | fcp->resp.fr_status = se_cmd->scsi_status; | |
144 | ||
145 | len = se_cmd->scsi_sense_length; | |
146 | if (len) { | |
147 | fcp->resp.fr_flags |= FCP_SNS_LEN_VAL; | |
148 | fcp->ext.fr_sns_len = htonl(len); | |
149 | memcpy((fcp + 1), se_cmd->sense_buffer, len); | |
150 | } | |
151 | ||
152 | /* | |
153 | * Test underflow and overflow with one mask. Usually both are off. | |
154 | * Bidirectional commands are not handled yet. | |
155 | */ | |
156 | if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT)) { | |
157 | if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) | |
158 | fcp->resp.fr_flags |= FCP_RESID_OVER; | |
159 | else | |
160 | fcp->resp.fr_flags |= FCP_RESID_UNDER; | |
161 | fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count); | |
162 | } | |
163 | ||
164 | /* | |
165 | * Send response. | |
166 | */ | |
167 | cmd->seq = lport->tt.seq_start_next(cmd->seq); | |
168 | fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP, | |
169 | FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ, 0); | |
170 | ||
171 | lport->tt.seq_send(lport, cmd->seq, fp); | |
172 | lport->tt.exch_done(cmd->seq); | |
173 | return 0; | |
174 | } | |
175 | ||
176 | int ft_write_pending_status(struct se_cmd *se_cmd) | |
177 | { | |
178 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
179 | ||
180 | return cmd->write_data_len != se_cmd->data_length; | |
181 | } | |
182 | ||
183 | /* | |
184 | * Send TX_RDY (transfer ready). | |
185 | */ | |
186 | int ft_write_pending(struct se_cmd *se_cmd) | |
187 | { | |
188 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
189 | struct fc_frame *fp; | |
190 | struct fcp_txrdy *txrdy; | |
191 | struct fc_lport *lport; | |
192 | struct fc_exch *ep; | |
193 | struct fc_frame_header *fh; | |
194 | u32 f_ctl; | |
195 | ||
196 | ft_dump_cmd(cmd, __func__); | |
197 | ||
198 | ep = fc_seq_exch(cmd->seq); | |
199 | lport = ep->lp; | |
200 | fp = fc_frame_alloc(lport, sizeof(*txrdy)); | |
201 | if (!fp) | |
202 | return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; | |
203 | ||
204 | txrdy = fc_frame_payload_get(fp, sizeof(*txrdy)); | |
205 | memset(txrdy, 0, sizeof(*txrdy)); | |
206 | txrdy->ft_burst_len = htonl(se_cmd->data_length); | |
207 | ||
208 | cmd->seq = lport->tt.seq_start_next(cmd->seq); | |
209 | fc_fill_fc_hdr(fp, FC_RCTL_DD_DATA_DESC, ep->did, ep->sid, FC_TYPE_FCP, | |
210 | FC_FC_EX_CTX | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
211 | ||
212 | fh = fc_frame_header_get(fp); | |
213 | f_ctl = ntoh24(fh->fh_f_ctl); | |
214 | ||
215 | /* Only if it is 'Exchange Responder' */ | |
216 | if (f_ctl & FC_FC_EX_CTX) { | |
217 | /* Target is 'exchange responder' and sending XFER_READY | |
218 | * to 'exchange initiator (initiator)' | |
219 | */ | |
220 | if ((ep->xid <= lport->lro_xid) && | |
221 | (fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) { | |
222 | if (se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) { | |
223 | /* | |
ec98f782 AG |
224 | * cmd may have been broken up into multiple |
225 | * tasks. Link their sgs together so we can | |
226 | * operate on them all at once. | |
3699d92a KP |
227 | */ |
228 | transport_do_task_sg_chain(se_cmd); | |
a1d8b49a | 229 | cmd->sg = se_cmd->t_tasks_sg_chained; |
3699d92a | 230 | cmd->sg_cnt = |
a1d8b49a | 231 | se_cmd->t_tasks_sg_chained_no; |
3699d92a | 232 | } |
33dc362b YZ |
233 | if (cmd->sg && lport->tt.ddp_target(lport, ep->xid, |
234 | cmd->sg, | |
235 | cmd->sg_cnt)) | |
3699d92a KP |
236 | cmd->was_ddp_setup = 1; |
237 | } | |
238 | } | |
239 | lport->tt.seq_send(lport, cmd->seq, fp); | |
240 | return 0; | |
241 | } | |
242 | ||
243 | u32 ft_get_task_tag(struct se_cmd *se_cmd) | |
244 | { | |
245 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
246 | ||
247 | return fc_seq_exch(cmd->seq)->rxid; | |
248 | } | |
249 | ||
250 | int ft_get_cmd_state(struct se_cmd *se_cmd) | |
251 | { | |
58fc73d1 | 252 | return 0; |
3699d92a KP |
253 | } |
254 | ||
255 | int ft_is_state_remove(struct se_cmd *se_cmd) | |
256 | { | |
257 | return 0; /* XXX TBD */ | |
258 | } | |
259 | ||
3699d92a KP |
260 | /* |
261 | * FC sequence response handler for follow-on sequences (data) and aborts. | |
262 | */ | |
263 | static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg) | |
264 | { | |
265 | struct ft_cmd *cmd = arg; | |
266 | struct fc_frame_header *fh; | |
267 | ||
268 | if (IS_ERR(fp)) { | |
269 | /* XXX need to find cmd if queued */ | |
3699d92a | 270 | cmd->seq = NULL; |
82f1c8a4 | 271 | transport_generic_free_cmd(&cmd->se_cmd, 0); |
3699d92a KP |
272 | return; |
273 | } | |
274 | ||
275 | fh = fc_frame_header_get(fp); | |
276 | ||
277 | switch (fh->fh_r_ctl) { | |
278 | case FC_RCTL_DD_SOL_DATA: /* write data */ | |
279 | ft_recv_write_data(cmd, fp); | |
280 | break; | |
281 | case FC_RCTL_DD_UNSOL_CTL: /* command */ | |
282 | case FC_RCTL_DD_SOL_CTL: /* transfer ready */ | |
283 | case FC_RCTL_DD_DATA_DESC: /* transfer ready */ | |
284 | default: | |
6708bb27 | 285 | pr_debug("%s: unhandled frame r_ctl %x\n", |
3699d92a | 286 | __func__, fh->fh_r_ctl); |
dcd998cc | 287 | ft_invl_hw_context(cmd); |
3699d92a | 288 | fc_frame_free(fp); |
82f1c8a4 | 289 | transport_generic_free_cmd(&cmd->se_cmd, 0); |
3699d92a KP |
290 | break; |
291 | } | |
292 | } | |
293 | ||
294 | /* | |
295 | * Send a FCP response including SCSI status and optional FCP rsp_code. | |
296 | * status is SAM_STAT_GOOD (zero) iff code is valid. | |
297 | * This is used in error cases, such as allocation failures. | |
298 | */ | |
299 | static void ft_send_resp_status(struct fc_lport *lport, | |
300 | const struct fc_frame *rx_fp, | |
301 | u32 status, enum fcp_resp_rsp_codes code) | |
302 | { | |
303 | struct fc_frame *fp; | |
304 | struct fc_seq *sp; | |
305 | const struct fc_frame_header *fh; | |
306 | size_t len; | |
307 | struct fcp_resp_with_ext *fcp; | |
308 | struct fcp_resp_rsp_info *info; | |
309 | ||
310 | fh = fc_frame_header_get(rx_fp); | |
6708bb27 | 311 | pr_debug("FCP error response: did %x oxid %x status %x code %x\n", |
3699d92a KP |
312 | ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code); |
313 | len = sizeof(*fcp); | |
314 | if (status == SAM_STAT_GOOD) | |
315 | len += sizeof(*info); | |
316 | fp = fc_frame_alloc(lport, len); | |
317 | if (!fp) | |
318 | return; | |
319 | fcp = fc_frame_payload_get(fp, len); | |
320 | memset(fcp, 0, len); | |
321 | fcp->resp.fr_status = status; | |
322 | if (status == SAM_STAT_GOOD) { | |
323 | fcp->ext.fr_rsp_len = htonl(sizeof(*info)); | |
324 | fcp->resp.fr_flags |= FCP_RSP_LEN_VAL; | |
325 | info = (struct fcp_resp_rsp_info *)(fcp + 1); | |
326 | info->rsp_code = code; | |
327 | } | |
328 | ||
329 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0); | |
330 | sp = fr_seq(fp); | |
331 | if (sp) | |
332 | lport->tt.seq_send(lport, sp, fp); | |
333 | else | |
334 | lport->tt.frame_send(lport, fp); | |
335 | } | |
336 | ||
337 | /* | |
338 | * Send error or task management response. | |
3699d92a | 339 | */ |
f2f7b09c KP |
340 | static void ft_send_resp_code(struct ft_cmd *cmd, |
341 | enum fcp_resp_rsp_codes code) | |
3699d92a KP |
342 | { |
343 | ft_send_resp_status(cmd->sess->tport->lport, | |
344 | cmd->req_frame, SAM_STAT_GOOD, code); | |
f2f7b09c KP |
345 | } |
346 | ||
347 | ||
348 | /* | |
349 | * Send error or task management response. | |
350 | * Always frees the cmd and associated state. | |
351 | */ | |
352 | static void ft_send_resp_code_and_free(struct ft_cmd *cmd, | |
353 | enum fcp_resp_rsp_codes code) | |
354 | { | |
355 | ft_send_resp_code(cmd, code); | |
3699d92a KP |
356 | ft_free_cmd(cmd); |
357 | } | |
358 | ||
359 | /* | |
360 | * Handle Task Management Request. | |
361 | */ | |
362 | static void ft_send_tm(struct ft_cmd *cmd) | |
363 | { | |
364 | struct se_tmr_req *tmr; | |
365 | struct fcp_cmnd *fcp; | |
61db9527 | 366 | struct ft_sess *sess; |
3699d92a KP |
367 | u8 tm_func; |
368 | ||
369 | fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp)); | |
370 | ||
371 | switch (fcp->fc_tm_flags) { | |
372 | case FCP_TMF_LUN_RESET: | |
373 | tm_func = TMR_LUN_RESET; | |
3699d92a KP |
374 | break; |
375 | case FCP_TMF_TGT_RESET: | |
376 | tm_func = TMR_TARGET_WARM_RESET; | |
377 | break; | |
378 | case FCP_TMF_CLR_TASK_SET: | |
379 | tm_func = TMR_CLEAR_TASK_SET; | |
380 | break; | |
381 | case FCP_TMF_ABT_TASK_SET: | |
382 | tm_func = TMR_ABORT_TASK_SET; | |
383 | break; | |
384 | case FCP_TMF_CLR_ACA: | |
385 | tm_func = TMR_CLEAR_ACA; | |
386 | break; | |
387 | default: | |
388 | /* | |
389 | * FCP4r01 indicates having a combination of | |
390 | * tm_flags set is invalid. | |
391 | */ | |
6708bb27 | 392 | pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags); |
f2f7b09c | 393 | ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID); |
3699d92a KP |
394 | return; |
395 | } | |
396 | ||
6708bb27 | 397 | pr_debug("alloc tm cmd fn %d\n", tm_func); |
dd503a5f | 398 | tmr = core_tmr_alloc_req(&cmd->se_cmd, cmd, tm_func, GFP_KERNEL); |
3699d92a | 399 | if (!tmr) { |
6708bb27 | 400 | pr_debug("alloc failed\n"); |
f2f7b09c | 401 | ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED); |
3699d92a KP |
402 | return; |
403 | } | |
404 | cmd->se_cmd.se_tmr_req = tmr; | |
61db9527 KP |
405 | |
406 | switch (fcp->fc_tm_flags) { | |
407 | case FCP_TMF_LUN_RESET: | |
408 | cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun); | |
5951146d | 409 | if (transport_lookup_tmr_lun(&cmd->se_cmd, cmd->lun) < 0) { |
61db9527 KP |
410 | /* |
411 | * Make sure to clean up newly allocated TMR request | |
412 | * since "unable to handle TMR request because failed | |
413 | * to get to LUN" | |
414 | */ | |
6708bb27 | 415 | pr_debug("Failed to get LUN for TMR func %d, " |
61db9527 KP |
416 | "se_cmd %p, unpacked_lun %d\n", |
417 | tm_func, &cmd->se_cmd, cmd->lun); | |
418 | ft_dump_cmd(cmd, __func__); | |
419 | sess = cmd->sess; | |
420 | transport_send_check_condition_and_sense(&cmd->se_cmd, | |
421 | cmd->se_cmd.scsi_sense_reason, 0); | |
82f1c8a4 | 422 | transport_generic_free_cmd(&cmd->se_cmd, 0); |
61db9527 KP |
423 | ft_sess_put(sess); |
424 | return; | |
425 | } | |
426 | break; | |
427 | case FCP_TMF_TGT_RESET: | |
428 | case FCP_TMF_CLR_TASK_SET: | |
429 | case FCP_TMF_ABT_TASK_SET: | |
430 | case FCP_TMF_CLR_ACA: | |
431 | break; | |
432 | default: | |
433 | return; | |
434 | } | |
3699d92a KP |
435 | transport_generic_handle_tmr(&cmd->se_cmd); |
436 | } | |
437 | ||
438 | /* | |
439 | * Send status from completed task management request. | |
440 | */ | |
441 | int ft_queue_tm_resp(struct se_cmd *se_cmd) | |
442 | { | |
443 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
444 | struct se_tmr_req *tmr = se_cmd->se_tmr_req; | |
445 | enum fcp_resp_rsp_codes code; | |
446 | ||
447 | switch (tmr->response) { | |
448 | case TMR_FUNCTION_COMPLETE: | |
449 | code = FCP_TMF_CMPL; | |
450 | break; | |
451 | case TMR_LUN_DOES_NOT_EXIST: | |
452 | code = FCP_TMF_INVALID_LUN; | |
453 | break; | |
454 | case TMR_FUNCTION_REJECTED: | |
455 | code = FCP_TMF_REJECTED; | |
456 | break; | |
457 | case TMR_TASK_DOES_NOT_EXIST: | |
458 | case TMR_TASK_STILL_ALLEGIANT: | |
459 | case TMR_TASK_FAILOVER_NOT_SUPPORTED: | |
460 | case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: | |
461 | case TMR_FUNCTION_AUTHORIZATION_FAILED: | |
462 | default: | |
463 | code = FCP_TMF_FAILED; | |
464 | break; | |
465 | } | |
6708bb27 | 466 | pr_debug("tmr fn %d resp %d fcp code %d\n", |
3699d92a KP |
467 | tmr->function, tmr->response, code); |
468 | ft_send_resp_code(cmd, code); | |
469 | return 0; | |
470 | } | |
471 | ||
58fc73d1 CH |
472 | static void ft_send_work(struct work_struct *work); |
473 | ||
3699d92a KP |
474 | /* |
475 | * Handle incoming FCP command. | |
476 | */ | |
477 | static void ft_recv_cmd(struct ft_sess *sess, struct fc_frame *fp) | |
478 | { | |
479 | struct ft_cmd *cmd; | |
480 | struct fc_lport *lport = sess->tport->lport; | |
481 | ||
482 | cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC); | |
483 | if (!cmd) | |
484 | goto busy; | |
485 | cmd->sess = sess; | |
486 | cmd->seq = lport->tt.seq_assign(lport, fp); | |
487 | if (!cmd->seq) { | |
488 | kfree(cmd); | |
489 | goto busy; | |
490 | } | |
491 | cmd->req_frame = fp; /* hold frame during cmd */ | |
58fc73d1 CH |
492 | |
493 | INIT_WORK(&cmd->work, ft_send_work); | |
494 | queue_work(sess->tport->tpg->workqueue, &cmd->work); | |
3699d92a KP |
495 | return; |
496 | ||
497 | busy: | |
6708bb27 | 498 | pr_debug("cmd or seq allocation failure - sending BUSY\n"); |
3699d92a KP |
499 | ft_send_resp_status(lport, fp, SAM_STAT_BUSY, 0); |
500 | fc_frame_free(fp); | |
501 | ft_sess_put(sess); /* undo get from lookup */ | |
502 | } | |
503 | ||
504 | ||
505 | /* | |
506 | * Handle incoming FCP frame. | |
507 | * Caller has verified that the frame is type FCP. | |
508 | */ | |
509 | void ft_recv_req(struct ft_sess *sess, struct fc_frame *fp) | |
510 | { | |
511 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
512 | ||
513 | switch (fh->fh_r_ctl) { | |
514 | case FC_RCTL_DD_UNSOL_CMD: /* command */ | |
515 | ft_recv_cmd(sess, fp); | |
516 | break; | |
517 | case FC_RCTL_DD_SOL_DATA: /* write data */ | |
518 | case FC_RCTL_DD_UNSOL_CTL: | |
519 | case FC_RCTL_DD_SOL_CTL: | |
520 | case FC_RCTL_DD_DATA_DESC: /* transfer ready */ | |
521 | case FC_RCTL_ELS4_REQ: /* SRR, perhaps */ | |
522 | default: | |
6708bb27 | 523 | pr_debug("%s: unhandled frame r_ctl %x\n", |
3699d92a KP |
524 | __func__, fh->fh_r_ctl); |
525 | fc_frame_free(fp); | |
526 | ft_sess_put(sess); /* undo get from lookup */ | |
527 | break; | |
528 | } | |
529 | } | |
530 | ||
531 | /* | |
532 | * Send new command to target. | |
533 | */ | |
58fc73d1 | 534 | static void ft_send_work(struct work_struct *work) |
3699d92a | 535 | { |
58fc73d1 | 536 | struct ft_cmd *cmd = container_of(work, struct ft_cmd, work); |
3699d92a KP |
537 | struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame); |
538 | struct se_cmd *se_cmd; | |
539 | struct fcp_cmnd *fcp; | |
58fc73d1 | 540 | int data_dir = 0; |
3699d92a KP |
541 | u32 data_len; |
542 | int task_attr; | |
543 | int ret; | |
544 | ||
545 | fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp)); | |
546 | if (!fcp) | |
547 | goto err; | |
548 | ||
549 | if (fcp->fc_flags & FCP_CFL_LEN_MASK) | |
550 | goto err; /* not handling longer CDBs yet */ | |
551 | ||
552 | if (fcp->fc_tm_flags) { | |
553 | task_attr = FCP_PTA_SIMPLE; | |
554 | data_dir = DMA_NONE; | |
555 | data_len = 0; | |
556 | } else { | |
557 | switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) { | |
558 | case 0: | |
559 | data_dir = DMA_NONE; | |
560 | break; | |
561 | case FCP_CFL_RDDATA: | |
562 | data_dir = DMA_FROM_DEVICE; | |
563 | break; | |
564 | case FCP_CFL_WRDATA: | |
565 | data_dir = DMA_TO_DEVICE; | |
566 | break; | |
567 | case FCP_CFL_WRDATA | FCP_CFL_RDDATA: | |
568 | goto err; /* TBD not supported by tcm_fc yet */ | |
569 | } | |
61db1802 NB |
570 | /* |
571 | * Locate the SAM Task Attr from fc_pri_ta | |
572 | */ | |
573 | switch (fcp->fc_pri_ta & FCP_PTA_MASK) { | |
574 | case FCP_PTA_HEADQ: | |
575 | task_attr = MSG_HEAD_TAG; | |
576 | break; | |
577 | case FCP_PTA_ORDERED: | |
578 | task_attr = MSG_ORDERED_TAG; | |
579 | break; | |
580 | case FCP_PTA_ACA: | |
581 | task_attr = MSG_ACA_TAG; | |
582 | break; | |
583 | case FCP_PTA_SIMPLE: /* Fallthrough */ | |
584 | default: | |
585 | task_attr = MSG_SIMPLE_TAG; | |
586 | } | |
587 | ||
3699d92a | 588 | |
3699d92a KP |
589 | task_attr = fcp->fc_pri_ta & FCP_PTA_MASK; |
590 | data_len = ntohl(fcp->fc_dl); | |
591 | cmd->cdb = fcp->fc_cdb; | |
592 | } | |
593 | ||
594 | se_cmd = &cmd->se_cmd; | |
595 | /* | |
596 | * Initialize struct se_cmd descriptor from target_core_mod | |
597 | * infrastructure | |
598 | */ | |
599 | transport_init_se_cmd(se_cmd, &ft_configfs->tf_ops, cmd->sess->se_sess, | |
600 | data_len, data_dir, task_attr, | |
601 | &cmd->ft_sense_buffer[0]); | |
602 | /* | |
603 | * Check for FCP task management flags | |
604 | */ | |
605 | if (fcp->fc_tm_flags) { | |
606 | ft_send_tm(cmd); | |
607 | return; | |
608 | } | |
609 | ||
610 | fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd); | |
611 | ||
61db9527 | 612 | cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun); |
5951146d | 613 | ret = transport_lookup_cmd_lun(&cmd->se_cmd, cmd->lun); |
3699d92a KP |
614 | if (ret < 0) { |
615 | ft_dump_cmd(cmd, __func__); | |
616 | transport_send_check_condition_and_sense(&cmd->se_cmd, | |
617 | cmd->se_cmd.scsi_sense_reason, 0); | |
618 | return; | |
619 | } | |
620 | ||
621 | ret = transport_generic_allocate_tasks(se_cmd, cmd->cdb); | |
622 | ||
6708bb27 | 623 | pr_debug("r_ctl %x alloc task ret %d\n", fh->fh_r_ctl, ret); |
3699d92a KP |
624 | ft_dump_cmd(cmd, __func__); |
625 | ||
5951146d | 626 | if (ret == -ENOMEM) { |
3699d92a KP |
627 | transport_send_check_condition_and_sense(se_cmd, |
628 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); | |
82f1c8a4 | 629 | transport_generic_free_cmd(se_cmd, 0); |
3699d92a KP |
630 | return; |
631 | } | |
5951146d | 632 | if (ret == -EINVAL) { |
3699d92a KP |
633 | if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT) |
634 | ft_queue_status(se_cmd); | |
635 | else | |
636 | transport_send_check_condition_and_sense(se_cmd, | |
637 | se_cmd->scsi_sense_reason, 0); | |
82f1c8a4 | 638 | transport_generic_free_cmd(se_cmd, 0); |
3699d92a KP |
639 | return; |
640 | } | |
4ca495e0 | 641 | transport_handle_cdb_direct(se_cmd); |
3699d92a KP |
642 | return; |
643 | ||
644 | err: | |
f2f7b09c | 645 | ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID); |
3699d92a | 646 | } |