Commit | Line | Data |
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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 <linux/utsname.h> |
23 | #include <linux/init.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/kthread.h> | |
26 | #include <linux/types.h> | |
27 | #include <linux/string.h> | |
28 | #include <linux/configfs.h> | |
29 | #include <linux/ctype.h> | |
30 | #include <linux/hash.h> | |
5f544cfa | 31 | #include <linux/percpu_ida.h> |
3699d92a | 32 | #include <asm/unaligned.h> |
61db1802 | 33 | #include <scsi/scsi_tcq.h> |
3699d92a KP |
34 | #include <scsi/libfc.h> |
35 | #include <scsi/fc_encode.h> | |
36 | ||
37 | #include <target/target_core_base.h> | |
c4795fb2 | 38 | #include <target/target_core_fabric.h> |
3699d92a KP |
39 | #include <target/configfs_macros.h> |
40 | ||
41 | #include "tcm_fc.h" | |
42 | ||
43 | /* | |
44 | * Dump cmd state for debugging. | |
45 | */ | |
1fa8f450 | 46 | static void _ft_dump_cmd(struct ft_cmd *cmd, const char *caller) |
3699d92a KP |
47 | { |
48 | struct fc_exch *ep; | |
49 | struct fc_seq *sp; | |
50 | struct se_cmd *se_cmd; | |
ec98f782 AG |
51 | struct scatterlist *sg; |
52 | int count; | |
3699d92a | 53 | |
3699d92a | 54 | se_cmd = &cmd->se_cmd; |
58fc73d1 CH |
55 | pr_debug("%s: cmd %p sess %p seq %p se_cmd %p\n", |
56 | caller, cmd, cmd->sess, cmd->seq, se_cmd); | |
3699d92a | 57 | |
6708bb27 | 58 | pr_debug("%s: cmd %p data_nents %u len %u se_cmd_flags <0x%x>\n", |
ec98f782 | 59 | caller, cmd, se_cmd->t_data_nents, |
05d1c7c0 | 60 | se_cmd->data_length, se_cmd->se_cmd_flags); |
5951146d | 61 | |
ec98f782 | 62 | for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, count) |
6708bb27 | 63 | pr_debug("%s: cmd %p sg %p page %p " |
ec98f782 AG |
64 | "len 0x%x off 0x%x\n", |
65 | caller, cmd, sg, | |
66 | sg_page(sg), sg->length, sg->offset); | |
67 | ||
3699d92a KP |
68 | sp = cmd->seq; |
69 | if (sp) { | |
70 | ep = fc_seq_exch(sp); | |
6708bb27 | 71 | pr_debug("%s: cmd %p sid %x did %x " |
3699d92a KP |
72 | "ox_id %x rx_id %x seq_id %x e_stat %x\n", |
73 | caller, cmd, ep->sid, ep->did, ep->oxid, ep->rxid, | |
74 | sp->id, ep->esb_stat); | |
75 | } | |
3699d92a KP |
76 | } |
77 | ||
1fa8f450 MR |
78 | void ft_dump_cmd(struct ft_cmd *cmd, const char *caller) |
79 | { | |
80 | if (unlikely(ft_debug_logging)) | |
81 | _ft_dump_cmd(cmd, caller); | |
82 | } | |
83 | ||
3699d92a KP |
84 | static void ft_free_cmd(struct ft_cmd *cmd) |
85 | { | |
86 | struct fc_frame *fp; | |
87 | struct fc_lport *lport; | |
ed8ec8f7 | 88 | struct ft_sess *sess; |
3699d92a KP |
89 | |
90 | if (!cmd) | |
91 | return; | |
ed8ec8f7 | 92 | sess = cmd->sess; |
3699d92a KP |
93 | fp = cmd->req_frame; |
94 | lport = fr_dev(fp); | |
95 | if (fr_seq(fp)) | |
96 | lport->tt.seq_release(fr_seq(fp)); | |
97 | fc_frame_free(fp); | |
ed8ec8f7 NB |
98 | percpu_ida_free(&sess->se_sess->sess_tag_pool, cmd->se_cmd.map_tag); |
99 | ft_sess_put(sess); /* undo get from lookup at recv */ | |
3699d92a KP |
100 | } |
101 | ||
102 | void ft_release_cmd(struct se_cmd *se_cmd) | |
103 | { | |
104 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
105 | ||
106 | ft_free_cmd(cmd); | |
107 | } | |
108 | ||
88dd9e26 | 109 | int ft_check_stop_free(struct se_cmd *se_cmd) |
3699d92a | 110 | { |
82f1c8a4 | 111 | transport_generic_free_cmd(se_cmd, 0); |
88dd9e26 | 112 | return 1; |
3699d92a KP |
113 | } |
114 | ||
115 | /* | |
116 | * Send response. | |
117 | */ | |
118 | int ft_queue_status(struct se_cmd *se_cmd) | |
119 | { | |
120 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
121 | struct fc_frame *fp; | |
122 | struct fcp_resp_with_ext *fcp; | |
123 | struct fc_lport *lport; | |
124 | struct fc_exch *ep; | |
125 | size_t len; | |
6dbe7f4e | 126 | int rc; |
3699d92a | 127 | |
e1c40382 MR |
128 | if (cmd->aborted) |
129 | return 0; | |
3699d92a KP |
130 | ft_dump_cmd(cmd, __func__); |
131 | ep = fc_seq_exch(cmd->seq); | |
132 | lport = ep->lp; | |
133 | len = sizeof(*fcp) + se_cmd->scsi_sense_length; | |
134 | fp = fc_frame_alloc(lport, len); | |
135 | if (!fp) { | |
6dbe7f4e NB |
136 | se_cmd->scsi_status = SAM_STAT_TASK_SET_FULL; |
137 | return -ENOMEM; | |
3699d92a | 138 | } |
6dbe7f4e | 139 | |
3699d92a KP |
140 | fcp = fc_frame_payload_get(fp, len); |
141 | memset(fcp, 0, len); | |
142 | fcp->resp.fr_status = se_cmd->scsi_status; | |
143 | ||
144 | len = se_cmd->scsi_sense_length; | |
145 | if (len) { | |
146 | fcp->resp.fr_flags |= FCP_SNS_LEN_VAL; | |
147 | fcp->ext.fr_sns_len = htonl(len); | |
148 | memcpy((fcp + 1), se_cmd->sense_buffer, len); | |
149 | } | |
150 | ||
151 | /* | |
152 | * Test underflow and overflow with one mask. Usually both are off. | |
153 | * Bidirectional commands are not handled yet. | |
154 | */ | |
155 | if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT)) { | |
156 | if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) | |
157 | fcp->resp.fr_flags |= FCP_RESID_OVER; | |
158 | else | |
159 | fcp->resp.fr_flags |= FCP_RESID_UNDER; | |
160 | fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count); | |
161 | } | |
162 | ||
163 | /* | |
164 | * Send response. | |
165 | */ | |
166 | cmd->seq = lport->tt.seq_start_next(cmd->seq); | |
167 | fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP, | |
168 | FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ, 0); | |
169 | ||
6dbe7f4e NB |
170 | rc = lport->tt.seq_send(lport, cmd->seq, fp); |
171 | if (rc) { | |
172 | pr_info_ratelimited("%s: Failed to send response frame %p, " | |
173 | "xid <0x%x>\n", __func__, fp, ep->xid); | |
174 | /* | |
175 | * Generate a TASK_SET_FULL status to notify the initiator | |
176 | * to reduce it's queue_depth after the se_cmd response has | |
177 | * been re-queued by target-core. | |
178 | */ | |
179 | se_cmd->scsi_status = SAM_STAT_TASK_SET_FULL; | |
180 | return -ENOMEM; | |
181 | } | |
3699d92a KP |
182 | lport->tt.exch_done(cmd->seq); |
183 | return 0; | |
184 | } | |
185 | ||
186 | int ft_write_pending_status(struct se_cmd *se_cmd) | |
187 | { | |
188 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
189 | ||
190 | return cmd->write_data_len != se_cmd->data_length; | |
191 | } | |
192 | ||
193 | /* | |
194 | * Send TX_RDY (transfer ready). | |
195 | */ | |
196 | int ft_write_pending(struct se_cmd *se_cmd) | |
197 | { | |
198 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
199 | struct fc_frame *fp; | |
200 | struct fcp_txrdy *txrdy; | |
201 | struct fc_lport *lport; | |
202 | struct fc_exch *ep; | |
203 | struct fc_frame_header *fh; | |
204 | u32 f_ctl; | |
205 | ||
206 | ft_dump_cmd(cmd, __func__); | |
207 | ||
e1c40382 MR |
208 | if (cmd->aborted) |
209 | return 0; | |
3699d92a KP |
210 | ep = fc_seq_exch(cmd->seq); |
211 | lport = ep->lp; | |
212 | fp = fc_frame_alloc(lport, sizeof(*txrdy)); | |
213 | if (!fp) | |
03e98c9e | 214 | return -ENOMEM; /* Signal QUEUE_FULL */ |
3699d92a KP |
215 | |
216 | txrdy = fc_frame_payload_get(fp, sizeof(*txrdy)); | |
217 | memset(txrdy, 0, sizeof(*txrdy)); | |
218 | txrdy->ft_burst_len = htonl(se_cmd->data_length); | |
219 | ||
220 | cmd->seq = lport->tt.seq_start_next(cmd->seq); | |
221 | fc_fill_fc_hdr(fp, FC_RCTL_DD_DATA_DESC, ep->did, ep->sid, FC_TYPE_FCP, | |
222 | FC_FC_EX_CTX | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
223 | ||
224 | fh = fc_frame_header_get(fp); | |
225 | f_ctl = ntoh24(fh->fh_f_ctl); | |
226 | ||
227 | /* Only if it is 'Exchange Responder' */ | |
228 | if (f_ctl & FC_FC_EX_CTX) { | |
229 | /* Target is 'exchange responder' and sending XFER_READY | |
230 | * to 'exchange initiator (initiator)' | |
231 | */ | |
232 | if ((ep->xid <= lport->lro_xid) && | |
233 | (fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) { | |
64f1db38 | 234 | if ((se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && |
e182d682 RD |
235 | lport->tt.ddp_target(lport, ep->xid, |
236 | se_cmd->t_data_sg, | |
237 | se_cmd->t_data_nents)) | |
3699d92a KP |
238 | cmd->was_ddp_setup = 1; |
239 | } | |
240 | } | |
241 | lport->tt.seq_send(lport, cmd->seq, fp); | |
242 | return 0; | |
243 | } | |
244 | ||
3699d92a KP |
245 | int ft_get_cmd_state(struct se_cmd *se_cmd) |
246 | { | |
58fc73d1 | 247 | return 0; |
3699d92a KP |
248 | } |
249 | ||
3699d92a KP |
250 | /* |
251 | * FC sequence response handler for follow-on sequences (data) and aborts. | |
252 | */ | |
253 | static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg) | |
254 | { | |
255 | struct ft_cmd *cmd = arg; | |
256 | struct fc_frame_header *fh; | |
257 | ||
e1c40382 | 258 | if (unlikely(IS_ERR(fp))) { |
3699d92a | 259 | /* XXX need to find cmd if queued */ |
3699d92a | 260 | cmd->seq = NULL; |
e1c40382 | 261 | cmd->aborted = true; |
3699d92a KP |
262 | return; |
263 | } | |
264 | ||
265 | fh = fc_frame_header_get(fp); | |
266 | ||
267 | switch (fh->fh_r_ctl) { | |
268 | case FC_RCTL_DD_SOL_DATA: /* write data */ | |
269 | ft_recv_write_data(cmd, fp); | |
270 | break; | |
271 | case FC_RCTL_DD_UNSOL_CTL: /* command */ | |
272 | case FC_RCTL_DD_SOL_CTL: /* transfer ready */ | |
273 | case FC_RCTL_DD_DATA_DESC: /* transfer ready */ | |
274 | default: | |
6708bb27 | 275 | pr_debug("%s: unhandled frame r_ctl %x\n", |
3699d92a | 276 | __func__, fh->fh_r_ctl); |
dcd998cc | 277 | ft_invl_hw_context(cmd); |
3699d92a | 278 | fc_frame_free(fp); |
82f1c8a4 | 279 | transport_generic_free_cmd(&cmd->se_cmd, 0); |
3699d92a KP |
280 | break; |
281 | } | |
282 | } | |
283 | ||
284 | /* | |
285 | * Send a FCP response including SCSI status and optional FCP rsp_code. | |
286 | * status is SAM_STAT_GOOD (zero) iff code is valid. | |
287 | * This is used in error cases, such as allocation failures. | |
288 | */ | |
289 | static void ft_send_resp_status(struct fc_lport *lport, | |
290 | const struct fc_frame *rx_fp, | |
291 | u32 status, enum fcp_resp_rsp_codes code) | |
292 | { | |
293 | struct fc_frame *fp; | |
294 | struct fc_seq *sp; | |
295 | const struct fc_frame_header *fh; | |
296 | size_t len; | |
297 | struct fcp_resp_with_ext *fcp; | |
298 | struct fcp_resp_rsp_info *info; | |
299 | ||
300 | fh = fc_frame_header_get(rx_fp); | |
6708bb27 | 301 | pr_debug("FCP error response: did %x oxid %x status %x code %x\n", |
3699d92a KP |
302 | ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code); |
303 | len = sizeof(*fcp); | |
304 | if (status == SAM_STAT_GOOD) | |
305 | len += sizeof(*info); | |
306 | fp = fc_frame_alloc(lport, len); | |
307 | if (!fp) | |
308 | return; | |
309 | fcp = fc_frame_payload_get(fp, len); | |
310 | memset(fcp, 0, len); | |
311 | fcp->resp.fr_status = status; | |
312 | if (status == SAM_STAT_GOOD) { | |
313 | fcp->ext.fr_rsp_len = htonl(sizeof(*info)); | |
314 | fcp->resp.fr_flags |= FCP_RSP_LEN_VAL; | |
315 | info = (struct fcp_resp_rsp_info *)(fcp + 1); | |
316 | info->rsp_code = code; | |
317 | } | |
318 | ||
319 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0); | |
320 | sp = fr_seq(fp); | |
031ed4d5 | 321 | if (sp) { |
3699d92a | 322 | lport->tt.seq_send(lport, sp, fp); |
031ed4d5 NB |
323 | lport->tt.exch_done(sp); |
324 | } else { | |
3699d92a | 325 | lport->tt.frame_send(lport, fp); |
031ed4d5 | 326 | } |
3699d92a KP |
327 | } |
328 | ||
329 | /* | |
330 | * Send error or task management response. | |
3699d92a | 331 | */ |
f2f7b09c KP |
332 | static void ft_send_resp_code(struct ft_cmd *cmd, |
333 | enum fcp_resp_rsp_codes code) | |
3699d92a KP |
334 | { |
335 | ft_send_resp_status(cmd->sess->tport->lport, | |
336 | cmd->req_frame, SAM_STAT_GOOD, code); | |
f2f7b09c KP |
337 | } |
338 | ||
339 | ||
340 | /* | |
341 | * Send error or task management response. | |
342 | * Always frees the cmd and associated state. | |
343 | */ | |
344 | static void ft_send_resp_code_and_free(struct ft_cmd *cmd, | |
345 | enum fcp_resp_rsp_codes code) | |
346 | { | |
347 | ft_send_resp_code(cmd, code); | |
3699d92a KP |
348 | ft_free_cmd(cmd); |
349 | } | |
350 | ||
351 | /* | |
352 | * Handle Task Management Request. | |
353 | */ | |
354 | static void ft_send_tm(struct ft_cmd *cmd) | |
355 | { | |
3699d92a | 356 | struct fcp_cmnd *fcp; |
00ad4c4e | 357 | int rc; |
3699d92a KP |
358 | u8 tm_func; |
359 | ||
360 | fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp)); | |
361 | ||
362 | switch (fcp->fc_tm_flags) { | |
363 | case FCP_TMF_LUN_RESET: | |
364 | tm_func = TMR_LUN_RESET; | |
3699d92a KP |
365 | break; |
366 | case FCP_TMF_TGT_RESET: | |
367 | tm_func = TMR_TARGET_WARM_RESET; | |
368 | break; | |
369 | case FCP_TMF_CLR_TASK_SET: | |
370 | tm_func = TMR_CLEAR_TASK_SET; | |
371 | break; | |
372 | case FCP_TMF_ABT_TASK_SET: | |
373 | tm_func = TMR_ABORT_TASK_SET; | |
374 | break; | |
375 | case FCP_TMF_CLR_ACA: | |
376 | tm_func = TMR_CLEAR_ACA; | |
377 | break; | |
378 | default: | |
379 | /* | |
380 | * FCP4r01 indicates having a combination of | |
381 | * tm_flags set is invalid. | |
382 | */ | |
6708bb27 | 383 | pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags); |
f2f7b09c | 384 | ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID); |
3699d92a KP |
385 | return; |
386 | } | |
387 | ||
c0974f89 | 388 | /* FIXME: Add referenced task tag for ABORT_TASK */ |
00ad4c4e | 389 | rc = target_submit_tmr(&cmd->se_cmd, cmd->sess->se_sess, |
59dcb5ec | 390 | &cmd->ft_sense_buffer[0], scsilun_to_int(&fcp->fc_lun), |
c0974f89 | 391 | cmd, tm_func, GFP_KERNEL, 0, 0); |
00ad4c4e NB |
392 | if (rc < 0) |
393 | ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED); | |
3699d92a KP |
394 | } |
395 | ||
396 | /* | |
397 | * Send status from completed task management request. | |
398 | */ | |
b79fafac | 399 | void ft_queue_tm_resp(struct se_cmd *se_cmd) |
3699d92a KP |
400 | { |
401 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
402 | struct se_tmr_req *tmr = se_cmd->se_tmr_req; | |
403 | enum fcp_resp_rsp_codes code; | |
404 | ||
e1c40382 | 405 | if (cmd->aborted) |
b79fafac | 406 | return; |
3699d92a KP |
407 | switch (tmr->response) { |
408 | case TMR_FUNCTION_COMPLETE: | |
409 | code = FCP_TMF_CMPL; | |
410 | break; | |
411 | case TMR_LUN_DOES_NOT_EXIST: | |
412 | code = FCP_TMF_INVALID_LUN; | |
413 | break; | |
414 | case TMR_FUNCTION_REJECTED: | |
415 | code = FCP_TMF_REJECTED; | |
416 | break; | |
417 | case TMR_TASK_DOES_NOT_EXIST: | |
3699d92a | 418 | case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: |
3699d92a KP |
419 | default: |
420 | code = FCP_TMF_FAILED; | |
421 | break; | |
422 | } | |
6708bb27 | 423 | pr_debug("tmr fn %d resp %d fcp code %d\n", |
3699d92a KP |
424 | tmr->function, tmr->response, code); |
425 | ft_send_resp_code(cmd, code); | |
3699d92a KP |
426 | } |
427 | ||
131e6abc NB |
428 | void ft_aborted_task(struct se_cmd *se_cmd) |
429 | { | |
430 | return; | |
431 | } | |
432 | ||
58fc73d1 CH |
433 | static void ft_send_work(struct work_struct *work); |
434 | ||
3699d92a KP |
435 | /* |
436 | * Handle incoming FCP command. | |
437 | */ | |
438 | static void ft_recv_cmd(struct ft_sess *sess, struct fc_frame *fp) | |
439 | { | |
440 | struct ft_cmd *cmd; | |
441 | struct fc_lport *lport = sess->tport->lport; | |
5f544cfa NB |
442 | struct se_session *se_sess = sess->se_sess; |
443 | int tag; | |
3699d92a | 444 | |
6f6b5d1e | 445 | tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING); |
5f544cfa | 446 | if (tag < 0) |
3699d92a | 447 | goto busy; |
5f544cfa NB |
448 | |
449 | cmd = &((struct ft_cmd *)se_sess->sess_cmd_map)[tag]; | |
450 | memset(cmd, 0, sizeof(struct ft_cmd)); | |
451 | ||
452 | cmd->se_cmd.map_tag = tag; | |
3699d92a KP |
453 | cmd->sess = sess; |
454 | cmd->seq = lport->tt.seq_assign(lport, fp); | |
455 | if (!cmd->seq) { | |
5f544cfa | 456 | percpu_ida_free(&se_sess->sess_tag_pool, tag); |
3699d92a KP |
457 | goto busy; |
458 | } | |
459 | cmd->req_frame = fp; /* hold frame during cmd */ | |
58fc73d1 CH |
460 | |
461 | INIT_WORK(&cmd->work, ft_send_work); | |
462 | queue_work(sess->tport->tpg->workqueue, &cmd->work); | |
3699d92a KP |
463 | return; |
464 | ||
465 | busy: | |
6708bb27 | 466 | pr_debug("cmd or seq allocation failure - sending BUSY\n"); |
3699d92a KP |
467 | ft_send_resp_status(lport, fp, SAM_STAT_BUSY, 0); |
468 | fc_frame_free(fp); | |
469 | ft_sess_put(sess); /* undo get from lookup */ | |
470 | } | |
471 | ||
472 | ||
473 | /* | |
474 | * Handle incoming FCP frame. | |
475 | * Caller has verified that the frame is type FCP. | |
476 | */ | |
477 | void ft_recv_req(struct ft_sess *sess, struct fc_frame *fp) | |
478 | { | |
479 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
480 | ||
481 | switch (fh->fh_r_ctl) { | |
482 | case FC_RCTL_DD_UNSOL_CMD: /* command */ | |
483 | ft_recv_cmd(sess, fp); | |
484 | break; | |
485 | case FC_RCTL_DD_SOL_DATA: /* write data */ | |
486 | case FC_RCTL_DD_UNSOL_CTL: | |
487 | case FC_RCTL_DD_SOL_CTL: | |
488 | case FC_RCTL_DD_DATA_DESC: /* transfer ready */ | |
489 | case FC_RCTL_ELS4_REQ: /* SRR, perhaps */ | |
490 | default: | |
6708bb27 | 491 | pr_debug("%s: unhandled frame r_ctl %x\n", |
3699d92a KP |
492 | __func__, fh->fh_r_ctl); |
493 | fc_frame_free(fp); | |
494 | ft_sess_put(sess); /* undo get from lookup */ | |
495 | break; | |
496 | } | |
497 | } | |
498 | ||
499 | /* | |
500 | * Send new command to target. | |
501 | */ | |
58fc73d1 | 502 | static void ft_send_work(struct work_struct *work) |
3699d92a | 503 | { |
58fc73d1 | 504 | struct ft_cmd *cmd = container_of(work, struct ft_cmd, work); |
3699d92a | 505 | struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame); |
3699d92a | 506 | struct fcp_cmnd *fcp; |
58fc73d1 | 507 | int data_dir = 0; |
3699d92a | 508 | int task_attr; |
3699d92a KP |
509 | |
510 | fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp)); | |
511 | if (!fcp) | |
512 | goto err; | |
513 | ||
514 | if (fcp->fc_flags & FCP_CFL_LEN_MASK) | |
515 | goto err; /* not handling longer CDBs yet */ | |
516 | ||
3699d92a KP |
517 | /* |
518 | * Check for FCP task management flags | |
519 | */ | |
520 | if (fcp->fc_tm_flags) { | |
521 | ft_send_tm(cmd); | |
522 | return; | |
523 | } | |
0dccb69d AG |
524 | |
525 | switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) { | |
526 | case 0: | |
527 | data_dir = DMA_NONE; | |
528 | break; | |
529 | case FCP_CFL_RDDATA: | |
530 | data_dir = DMA_FROM_DEVICE; | |
531 | break; | |
532 | case FCP_CFL_WRDATA: | |
533 | data_dir = DMA_TO_DEVICE; | |
534 | break; | |
535 | case FCP_CFL_WRDATA | FCP_CFL_RDDATA: | |
536 | goto err; /* TBD not supported by tcm_fc yet */ | |
537 | } | |
538 | /* | |
539 | * Locate the SAM Task Attr from fc_pri_ta | |
540 | */ | |
541 | switch (fcp->fc_pri_ta & FCP_PTA_MASK) { | |
542 | case FCP_PTA_HEADQ: | |
68d81f40 | 543 | task_attr = TCM_HEAD_TAG; |
0dccb69d AG |
544 | break; |
545 | case FCP_PTA_ORDERED: | |
68d81f40 | 546 | task_attr = TCM_ORDERED_TAG; |
0dccb69d AG |
547 | break; |
548 | case FCP_PTA_ACA: | |
68d81f40 | 549 | task_attr = TCM_ACA_TAG; |
0dccb69d AG |
550 | break; |
551 | case FCP_PTA_SIMPLE: /* Fallthrough */ | |
552 | default: | |
68d81f40 | 553 | task_attr = TCM_SIMPLE_TAG; |
0dccb69d AG |
554 | } |
555 | ||
3699d92a | 556 | fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd); |
649ee054 | 557 | cmd->se_cmd.tag = fc_seq_exch(cmd->seq)->rxid; |
4355a911 NB |
558 | /* |
559 | * Use a single se_cmd->cmd_kref as we expect to release se_cmd | |
560 | * directly from ft_check_stop_free callback in response path. | |
561 | */ | |
d6dfc868 RD |
562 | if (target_submit_cmd(&cmd->se_cmd, cmd->sess->se_sess, fcp->fc_cdb, |
563 | &cmd->ft_sense_buffer[0], scsilun_to_int(&fcp->fc_lun), | |
564 | ntohl(fcp->fc_dl), task_attr, data_dir, 0)) | |
565 | goto err; | |
566 | ||
1edcdb49 | 567 | pr_debug("r_ctl %x alloc target_submit_cmd\n", fh->fh_r_ctl); |
3699d92a KP |
568 | return; |
569 | ||
570 | err: | |
f2f7b09c | 571 | ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID); |
3699d92a | 572 | } |