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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> | |
c4795fb2 | 42 | #include <target/target_core_fabric.h> |
3699d92a | 43 | #include <target/target_core_configfs.h> |
3699d92a KP |
44 | #include <target/configfs_macros.h> |
45 | ||
46 | #include "tcm_fc.h" | |
47 | ||
48 | /* | |
49 | * Dump cmd state for debugging. | |
50 | */ | |
51 | void ft_dump_cmd(struct ft_cmd *cmd, const char *caller) | |
52 | { | |
53 | struct fc_exch *ep; | |
54 | struct fc_seq *sp; | |
55 | struct se_cmd *se_cmd; | |
ec98f782 AG |
56 | struct scatterlist *sg; |
57 | int count; | |
3699d92a | 58 | |
3699d92a | 59 | se_cmd = &cmd->se_cmd; |
58fc73d1 CH |
60 | pr_debug("%s: cmd %p sess %p seq %p se_cmd %p\n", |
61 | caller, cmd, cmd->sess, cmd->seq, se_cmd); | |
3699d92a | 62 | |
6708bb27 | 63 | pr_debug("%s: cmd %p data_nents %u len %u se_cmd_flags <0x%x>\n", |
ec98f782 | 64 | caller, cmd, se_cmd->t_data_nents, |
05d1c7c0 | 65 | se_cmd->data_length, se_cmd->se_cmd_flags); |
5951146d | 66 | |
ec98f782 | 67 | for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, count) |
6708bb27 | 68 | pr_debug("%s: cmd %p sg %p page %p " |
ec98f782 AG |
69 | "len 0x%x off 0x%x\n", |
70 | caller, cmd, sg, | |
71 | sg_page(sg), sg->length, sg->offset); | |
72 | ||
3699d92a KP |
73 | sp = cmd->seq; |
74 | if (sp) { | |
75 | ep = fc_seq_exch(sp); | |
6708bb27 | 76 | pr_debug("%s: cmd %p sid %x did %x " |
3699d92a KP |
77 | "ox_id %x rx_id %x seq_id %x e_stat %x\n", |
78 | caller, cmd, ep->sid, ep->did, ep->oxid, ep->rxid, | |
79 | sp->id, ep->esb_stat); | |
80 | } | |
3699d92a KP |
81 | } |
82 | ||
3699d92a KP |
83 | static void ft_free_cmd(struct ft_cmd *cmd) |
84 | { | |
85 | struct fc_frame *fp; | |
86 | struct fc_lport *lport; | |
87 | ||
88 | if (!cmd) | |
89 | return; | |
90 | fp = cmd->req_frame; | |
91 | lport = fr_dev(fp); | |
92 | if (fr_seq(fp)) | |
93 | lport->tt.seq_release(fr_seq(fp)); | |
94 | fc_frame_free(fp); | |
95 | ft_sess_put(cmd->sess); /* undo get from lookup at recv */ | |
96 | kfree(cmd); | |
97 | } | |
98 | ||
99 | void ft_release_cmd(struct se_cmd *se_cmd) | |
100 | { | |
101 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
102 | ||
103 | ft_free_cmd(cmd); | |
104 | } | |
105 | ||
88dd9e26 | 106 | int ft_check_stop_free(struct se_cmd *se_cmd) |
3699d92a | 107 | { |
82f1c8a4 | 108 | transport_generic_free_cmd(se_cmd, 0); |
88dd9e26 | 109 | return 1; |
3699d92a KP |
110 | } |
111 | ||
112 | /* | |
113 | * Send response. | |
114 | */ | |
115 | int ft_queue_status(struct se_cmd *se_cmd) | |
116 | { | |
117 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
118 | struct fc_frame *fp; | |
119 | struct fcp_resp_with_ext *fcp; | |
120 | struct fc_lport *lport; | |
121 | struct fc_exch *ep; | |
122 | size_t len; | |
123 | ||
124 | ft_dump_cmd(cmd, __func__); | |
125 | ep = fc_seq_exch(cmd->seq); | |
126 | lport = ep->lp; | |
127 | len = sizeof(*fcp) + se_cmd->scsi_sense_length; | |
128 | fp = fc_frame_alloc(lport, len); | |
129 | if (!fp) { | |
130 | /* XXX shouldn't just drop it - requeue and retry? */ | |
131 | return 0; | |
132 | } | |
133 | fcp = fc_frame_payload_get(fp, len); | |
134 | memset(fcp, 0, len); | |
135 | fcp->resp.fr_status = se_cmd->scsi_status; | |
136 | ||
137 | len = se_cmd->scsi_sense_length; | |
138 | if (len) { | |
139 | fcp->resp.fr_flags |= FCP_SNS_LEN_VAL; | |
140 | fcp->ext.fr_sns_len = htonl(len); | |
141 | memcpy((fcp + 1), se_cmd->sense_buffer, len); | |
142 | } | |
143 | ||
144 | /* | |
145 | * Test underflow and overflow with one mask. Usually both are off. | |
146 | * Bidirectional commands are not handled yet. | |
147 | */ | |
148 | if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT)) { | |
149 | if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) | |
150 | fcp->resp.fr_flags |= FCP_RESID_OVER; | |
151 | else | |
152 | fcp->resp.fr_flags |= FCP_RESID_UNDER; | |
153 | fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count); | |
154 | } | |
155 | ||
156 | /* | |
157 | * Send response. | |
158 | */ | |
159 | cmd->seq = lport->tt.seq_start_next(cmd->seq); | |
160 | fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP, | |
161 | FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ, 0); | |
162 | ||
163 | lport->tt.seq_send(lport, cmd->seq, fp); | |
164 | lport->tt.exch_done(cmd->seq); | |
165 | return 0; | |
166 | } | |
167 | ||
168 | int ft_write_pending_status(struct se_cmd *se_cmd) | |
169 | { | |
170 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
171 | ||
172 | return cmd->write_data_len != se_cmd->data_length; | |
173 | } | |
174 | ||
175 | /* | |
176 | * Send TX_RDY (transfer ready). | |
177 | */ | |
178 | int ft_write_pending(struct se_cmd *se_cmd) | |
179 | { | |
180 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
181 | struct fc_frame *fp; | |
182 | struct fcp_txrdy *txrdy; | |
183 | struct fc_lport *lport; | |
184 | struct fc_exch *ep; | |
185 | struct fc_frame_header *fh; | |
186 | u32 f_ctl; | |
187 | ||
188 | ft_dump_cmd(cmd, __func__); | |
189 | ||
190 | ep = fc_seq_exch(cmd->seq); | |
191 | lport = ep->lp; | |
192 | fp = fc_frame_alloc(lport, sizeof(*txrdy)); | |
193 | if (!fp) | |
03e98c9e | 194 | return -ENOMEM; /* Signal QUEUE_FULL */ |
3699d92a KP |
195 | |
196 | txrdy = fc_frame_payload_get(fp, sizeof(*txrdy)); | |
197 | memset(txrdy, 0, sizeof(*txrdy)); | |
198 | txrdy->ft_burst_len = htonl(se_cmd->data_length); | |
199 | ||
200 | cmd->seq = lport->tt.seq_start_next(cmd->seq); | |
201 | fc_fill_fc_hdr(fp, FC_RCTL_DD_DATA_DESC, ep->did, ep->sid, FC_TYPE_FCP, | |
202 | FC_FC_EX_CTX | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
203 | ||
204 | fh = fc_frame_header_get(fp); | |
205 | f_ctl = ntoh24(fh->fh_f_ctl); | |
206 | ||
207 | /* Only if it is 'Exchange Responder' */ | |
208 | if (f_ctl & FC_FC_EX_CTX) { | |
209 | /* Target is 'exchange responder' and sending XFER_READY | |
210 | * to 'exchange initiator (initiator)' | |
211 | */ | |
212 | if ((ep->xid <= lport->lro_xid) && | |
213 | (fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) { | |
214 | if (se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) { | |
215 | /* | |
ec98f782 AG |
216 | * cmd may have been broken up into multiple |
217 | * tasks. Link their sgs together so we can | |
218 | * operate on them all at once. | |
3699d92a KP |
219 | */ |
220 | transport_do_task_sg_chain(se_cmd); | |
a1d8b49a | 221 | cmd->sg = se_cmd->t_tasks_sg_chained; |
3699d92a | 222 | cmd->sg_cnt = |
a1d8b49a | 223 | se_cmd->t_tasks_sg_chained_no; |
3699d92a | 224 | } |
33dc362b YZ |
225 | if (cmd->sg && lport->tt.ddp_target(lport, ep->xid, |
226 | cmd->sg, | |
227 | cmd->sg_cnt)) | |
3699d92a KP |
228 | cmd->was_ddp_setup = 1; |
229 | } | |
230 | } | |
231 | lport->tt.seq_send(lport, cmd->seq, fp); | |
232 | return 0; | |
233 | } | |
234 | ||
235 | u32 ft_get_task_tag(struct se_cmd *se_cmd) | |
236 | { | |
237 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
238 | ||
239 | return fc_seq_exch(cmd->seq)->rxid; | |
240 | } | |
241 | ||
242 | int ft_get_cmd_state(struct se_cmd *se_cmd) | |
243 | { | |
58fc73d1 | 244 | return 0; |
3699d92a KP |
245 | } |
246 | ||
3699d92a KP |
247 | /* |
248 | * FC sequence response handler for follow-on sequences (data) and aborts. | |
249 | */ | |
250 | static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg) | |
251 | { | |
252 | struct ft_cmd *cmd = arg; | |
253 | struct fc_frame_header *fh; | |
254 | ||
255 | if (IS_ERR(fp)) { | |
256 | /* XXX need to find cmd if queued */ | |
3699d92a | 257 | cmd->seq = NULL; |
82f1c8a4 | 258 | transport_generic_free_cmd(&cmd->se_cmd, 0); |
3699d92a KP |
259 | return; |
260 | } | |
261 | ||
262 | fh = fc_frame_header_get(fp); | |
263 | ||
264 | switch (fh->fh_r_ctl) { | |
265 | case FC_RCTL_DD_SOL_DATA: /* write data */ | |
266 | ft_recv_write_data(cmd, fp); | |
267 | break; | |
268 | case FC_RCTL_DD_UNSOL_CTL: /* command */ | |
269 | case FC_RCTL_DD_SOL_CTL: /* transfer ready */ | |
270 | case FC_RCTL_DD_DATA_DESC: /* transfer ready */ | |
271 | default: | |
6708bb27 | 272 | pr_debug("%s: unhandled frame r_ctl %x\n", |
3699d92a | 273 | __func__, fh->fh_r_ctl); |
dcd998cc | 274 | ft_invl_hw_context(cmd); |
3699d92a | 275 | fc_frame_free(fp); |
82f1c8a4 | 276 | transport_generic_free_cmd(&cmd->se_cmd, 0); |
3699d92a KP |
277 | break; |
278 | } | |
279 | } | |
280 | ||
281 | /* | |
282 | * Send a FCP response including SCSI status and optional FCP rsp_code. | |
283 | * status is SAM_STAT_GOOD (zero) iff code is valid. | |
284 | * This is used in error cases, such as allocation failures. | |
285 | */ | |
286 | static void ft_send_resp_status(struct fc_lport *lport, | |
287 | const struct fc_frame *rx_fp, | |
288 | u32 status, enum fcp_resp_rsp_codes code) | |
289 | { | |
290 | struct fc_frame *fp; | |
291 | struct fc_seq *sp; | |
292 | const struct fc_frame_header *fh; | |
293 | size_t len; | |
294 | struct fcp_resp_with_ext *fcp; | |
295 | struct fcp_resp_rsp_info *info; | |
296 | ||
297 | fh = fc_frame_header_get(rx_fp); | |
6708bb27 | 298 | pr_debug("FCP error response: did %x oxid %x status %x code %x\n", |
3699d92a KP |
299 | ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code); |
300 | len = sizeof(*fcp); | |
301 | if (status == SAM_STAT_GOOD) | |
302 | len += sizeof(*info); | |
303 | fp = fc_frame_alloc(lport, len); | |
304 | if (!fp) | |
305 | return; | |
306 | fcp = fc_frame_payload_get(fp, len); | |
307 | memset(fcp, 0, len); | |
308 | fcp->resp.fr_status = status; | |
309 | if (status == SAM_STAT_GOOD) { | |
310 | fcp->ext.fr_rsp_len = htonl(sizeof(*info)); | |
311 | fcp->resp.fr_flags |= FCP_RSP_LEN_VAL; | |
312 | info = (struct fcp_resp_rsp_info *)(fcp + 1); | |
313 | info->rsp_code = code; | |
314 | } | |
315 | ||
316 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0); | |
317 | sp = fr_seq(fp); | |
031ed4d5 | 318 | if (sp) { |
3699d92a | 319 | lport->tt.seq_send(lport, sp, fp); |
031ed4d5 NB |
320 | lport->tt.exch_done(sp); |
321 | } else { | |
3699d92a | 322 | lport->tt.frame_send(lport, fp); |
031ed4d5 | 323 | } |
3699d92a KP |
324 | } |
325 | ||
326 | /* | |
327 | * Send error or task management response. | |
3699d92a | 328 | */ |
f2f7b09c KP |
329 | static void ft_send_resp_code(struct ft_cmd *cmd, |
330 | enum fcp_resp_rsp_codes code) | |
3699d92a KP |
331 | { |
332 | ft_send_resp_status(cmd->sess->tport->lport, | |
333 | cmd->req_frame, SAM_STAT_GOOD, code); | |
f2f7b09c KP |
334 | } |
335 | ||
336 | ||
337 | /* | |
338 | * Send error or task management response. | |
339 | * Always frees the cmd and associated state. | |
340 | */ | |
341 | static void ft_send_resp_code_and_free(struct ft_cmd *cmd, | |
342 | enum fcp_resp_rsp_codes code) | |
343 | { | |
344 | ft_send_resp_code(cmd, code); | |
3699d92a KP |
345 | ft_free_cmd(cmd); |
346 | } | |
347 | ||
348 | /* | |
349 | * Handle Task Management Request. | |
350 | */ | |
351 | static void ft_send_tm(struct ft_cmd *cmd) | |
352 | { | |
3699d92a | 353 | struct fcp_cmnd *fcp; |
00ad4c4e | 354 | int rc; |
3699d92a KP |
355 | u8 tm_func; |
356 | ||
357 | fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp)); | |
358 | ||
359 | switch (fcp->fc_tm_flags) { | |
360 | case FCP_TMF_LUN_RESET: | |
361 | tm_func = TMR_LUN_RESET; | |
3699d92a KP |
362 | break; |
363 | case FCP_TMF_TGT_RESET: | |
364 | tm_func = TMR_TARGET_WARM_RESET; | |
365 | break; | |
366 | case FCP_TMF_CLR_TASK_SET: | |
367 | tm_func = TMR_CLEAR_TASK_SET; | |
368 | break; | |
369 | case FCP_TMF_ABT_TASK_SET: | |
370 | tm_func = TMR_ABORT_TASK_SET; | |
371 | break; | |
372 | case FCP_TMF_CLR_ACA: | |
373 | tm_func = TMR_CLEAR_ACA; | |
374 | break; | |
375 | default: | |
376 | /* | |
377 | * FCP4r01 indicates having a combination of | |
378 | * tm_flags set is invalid. | |
379 | */ | |
6708bb27 | 380 | pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags); |
f2f7b09c | 381 | ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID); |
3699d92a KP |
382 | return; |
383 | } | |
384 | ||
c0974f89 | 385 | /* FIXME: Add referenced task tag for ABORT_TASK */ |
00ad4c4e | 386 | rc = target_submit_tmr(&cmd->se_cmd, cmd->sess->se_sess, |
59dcb5ec | 387 | &cmd->ft_sense_buffer[0], scsilun_to_int(&fcp->fc_lun), |
c0974f89 | 388 | cmd, tm_func, GFP_KERNEL, 0, 0); |
00ad4c4e NB |
389 | if (rc < 0) |
390 | ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED); | |
3699d92a KP |
391 | } |
392 | ||
393 | /* | |
394 | * Send status from completed task management request. | |
395 | */ | |
396 | int ft_queue_tm_resp(struct se_cmd *se_cmd) | |
397 | { | |
398 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
399 | struct se_tmr_req *tmr = se_cmd->se_tmr_req; | |
400 | enum fcp_resp_rsp_codes code; | |
401 | ||
402 | switch (tmr->response) { | |
403 | case TMR_FUNCTION_COMPLETE: | |
404 | code = FCP_TMF_CMPL; | |
405 | break; | |
406 | case TMR_LUN_DOES_NOT_EXIST: | |
407 | code = FCP_TMF_INVALID_LUN; | |
408 | break; | |
409 | case TMR_FUNCTION_REJECTED: | |
410 | code = FCP_TMF_REJECTED; | |
411 | break; | |
412 | case TMR_TASK_DOES_NOT_EXIST: | |
413 | case TMR_TASK_STILL_ALLEGIANT: | |
414 | case TMR_TASK_FAILOVER_NOT_SUPPORTED: | |
415 | case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: | |
416 | case TMR_FUNCTION_AUTHORIZATION_FAILED: | |
417 | default: | |
418 | code = FCP_TMF_FAILED; | |
419 | break; | |
420 | } | |
6708bb27 | 421 | pr_debug("tmr fn %d resp %d fcp code %d\n", |
3699d92a KP |
422 | tmr->function, tmr->response, code); |
423 | ft_send_resp_code(cmd, code); | |
424 | return 0; | |
425 | } | |
426 | ||
58fc73d1 CH |
427 | static void ft_send_work(struct work_struct *work); |
428 | ||
3699d92a KP |
429 | /* |
430 | * Handle incoming FCP command. | |
431 | */ | |
432 | static void ft_recv_cmd(struct ft_sess *sess, struct fc_frame *fp) | |
433 | { | |
434 | struct ft_cmd *cmd; | |
435 | struct fc_lport *lport = sess->tport->lport; | |
436 | ||
437 | cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC); | |
438 | if (!cmd) | |
439 | goto busy; | |
440 | cmd->sess = sess; | |
441 | cmd->seq = lport->tt.seq_assign(lport, fp); | |
442 | if (!cmd->seq) { | |
443 | kfree(cmd); | |
444 | goto busy; | |
445 | } | |
446 | cmd->req_frame = fp; /* hold frame during cmd */ | |
58fc73d1 CH |
447 | |
448 | INIT_WORK(&cmd->work, ft_send_work); | |
449 | queue_work(sess->tport->tpg->workqueue, &cmd->work); | |
3699d92a KP |
450 | return; |
451 | ||
452 | busy: | |
6708bb27 | 453 | pr_debug("cmd or seq allocation failure - sending BUSY\n"); |
3699d92a KP |
454 | ft_send_resp_status(lport, fp, SAM_STAT_BUSY, 0); |
455 | fc_frame_free(fp); | |
456 | ft_sess_put(sess); /* undo get from lookup */ | |
457 | } | |
458 | ||
459 | ||
460 | /* | |
461 | * Handle incoming FCP frame. | |
462 | * Caller has verified that the frame is type FCP. | |
463 | */ | |
464 | void ft_recv_req(struct ft_sess *sess, struct fc_frame *fp) | |
465 | { | |
466 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
467 | ||
468 | switch (fh->fh_r_ctl) { | |
469 | case FC_RCTL_DD_UNSOL_CMD: /* command */ | |
470 | ft_recv_cmd(sess, fp); | |
471 | break; | |
472 | case FC_RCTL_DD_SOL_DATA: /* write data */ | |
473 | case FC_RCTL_DD_UNSOL_CTL: | |
474 | case FC_RCTL_DD_SOL_CTL: | |
475 | case FC_RCTL_DD_DATA_DESC: /* transfer ready */ | |
476 | case FC_RCTL_ELS4_REQ: /* SRR, perhaps */ | |
477 | default: | |
6708bb27 | 478 | pr_debug("%s: unhandled frame r_ctl %x\n", |
3699d92a KP |
479 | __func__, fh->fh_r_ctl); |
480 | fc_frame_free(fp); | |
481 | ft_sess_put(sess); /* undo get from lookup */ | |
482 | break; | |
483 | } | |
484 | } | |
485 | ||
486 | /* | |
487 | * Send new command to target. | |
488 | */ | |
58fc73d1 | 489 | static void ft_send_work(struct work_struct *work) |
3699d92a | 490 | { |
58fc73d1 | 491 | struct ft_cmd *cmd = container_of(work, struct ft_cmd, work); |
3699d92a | 492 | struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame); |
3699d92a | 493 | struct fcp_cmnd *fcp; |
58fc73d1 | 494 | int data_dir = 0; |
3699d92a | 495 | int task_attr; |
3699d92a KP |
496 | |
497 | fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp)); | |
498 | if (!fcp) | |
499 | goto err; | |
500 | ||
501 | if (fcp->fc_flags & FCP_CFL_LEN_MASK) | |
502 | goto err; /* not handling longer CDBs yet */ | |
503 | ||
3699d92a KP |
504 | /* |
505 | * Check for FCP task management flags | |
506 | */ | |
507 | if (fcp->fc_tm_flags) { | |
508 | ft_send_tm(cmd); | |
509 | return; | |
510 | } | |
0dccb69d AG |
511 | |
512 | switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) { | |
513 | case 0: | |
514 | data_dir = DMA_NONE; | |
515 | break; | |
516 | case FCP_CFL_RDDATA: | |
517 | data_dir = DMA_FROM_DEVICE; | |
518 | break; | |
519 | case FCP_CFL_WRDATA: | |
520 | data_dir = DMA_TO_DEVICE; | |
521 | break; | |
522 | case FCP_CFL_WRDATA | FCP_CFL_RDDATA: | |
523 | goto err; /* TBD not supported by tcm_fc yet */ | |
524 | } | |
525 | /* | |
526 | * Locate the SAM Task Attr from fc_pri_ta | |
527 | */ | |
528 | switch (fcp->fc_pri_ta & FCP_PTA_MASK) { | |
529 | case FCP_PTA_HEADQ: | |
530 | task_attr = MSG_HEAD_TAG; | |
531 | break; | |
532 | case FCP_PTA_ORDERED: | |
533 | task_attr = MSG_ORDERED_TAG; | |
534 | break; | |
535 | case FCP_PTA_ACA: | |
536 | task_attr = MSG_ACA_TAG; | |
537 | break; | |
538 | case FCP_PTA_SIMPLE: /* Fallthrough */ | |
539 | default: | |
540 | task_attr = MSG_SIMPLE_TAG; | |
541 | } | |
542 | ||
3699d92a | 543 | fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd); |
4355a911 NB |
544 | /* |
545 | * Use a single se_cmd->cmd_kref as we expect to release se_cmd | |
546 | * directly from ft_check_stop_free callback in response path. | |
547 | */ | |
35b2cdc4 | 548 | target_submit_cmd(&cmd->se_cmd, cmd->sess->se_sess, fcp->fc_cdb, |
e35fa8c2 | 549 | &cmd->ft_sense_buffer[0], scsilun_to_int(&fcp->fc_lun), |
0dccb69d | 550 | ntohl(fcp->fc_dl), task_attr, data_dir, 0); |
1edcdb49 | 551 | pr_debug("r_ctl %x alloc target_submit_cmd\n", fh->fh_r_ctl); |
3699d92a KP |
552 | return; |
553 | ||
554 | err: | |
f2f7b09c | 555 | ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID); |
3699d92a | 556 | } |