blob: 71fc9cea5dc9ba120b725a4e0f6bf94c879d1340 [file] [log] [blame]
Kiran Patil3699d922011-04-18 16:24:14 -07001/*
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>
Kiran Patil3699d922011-04-18 16:24:14 -070022#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>
Nicholas Bellinger61db1802011-05-19 20:19:14 -070037#include <scsi/scsi_tcq.h>
Kiran Patil3699d922011-04-18 16:24:14 -070038#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>
Kiran Patil3699d922011-04-18 16:24:14 -070047#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 */
55void 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;
Andy Groverec98f782011-07-20 19:28:46 +000060 struct scatterlist *sg;
61 int count;
Kiran Patil3699d922011-04-18 16:24:14 -070062
Kiran Patil3699d922011-04-18 16:24:14 -070063 se_cmd = &cmd->se_cmd;
Christoph Hellwig58fc73d2011-08-26 09:25:38 -070064 pr_debug("%s: cmd %p sess %p seq %p se_cmd %p\n",
65 caller, cmd, cmd->sess, cmd->seq, se_cmd);
Andy Grover6708bb22011-06-08 10:36:43 -070066 pr_debug("%s: cmd %p cdb %p\n",
Kiran Patil3699d922011-04-18 16:24:14 -070067 caller, cmd, cmd->cdb);
Andy Grover6708bb22011-06-08 10:36:43 -070068 pr_debug("%s: cmd %p lun %d\n", caller, cmd, cmd->lun);
Kiran Patil3699d922011-04-18 16:24:14 -070069
Andy Grover6708bb22011-06-08 10:36:43 -070070 pr_debug("%s: cmd %p data_nents %u len %u se_cmd_flags <0x%x>\n",
Andy Groverec98f782011-07-20 19:28:46 +000071 caller, cmd, se_cmd->t_data_nents,
Andy Grover05d1c7c2011-07-20 19:13:28 +000072 se_cmd->data_length, se_cmd->se_cmd_flags);
Andy Grover5951146d2011-07-19 10:26:37 +000073
Andy Groverec98f782011-07-20 19:28:46 +000074 for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, count)
Andy Grover6708bb22011-06-08 10:36:43 -070075 pr_debug("%s: cmd %p sg %p page %p "
Andy Groverec98f782011-07-20 19:28:46 +000076 "len 0x%x off 0x%x\n",
77 caller, cmd, sg,
78 sg_page(sg), sg->length, sg->offset);
79
Kiran Patil3699d922011-04-18 16:24:14 -070080 sp = cmd->seq;
81 if (sp) {
82 ep = fc_seq_exch(sp);
Andy Grover6708bb22011-06-08 10:36:43 -070083 pr_debug("%s: cmd %p sid %x did %x "
Kiran Patil3699d922011-04-18 16:24:14 -070084 "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
Kiran Patil3699d922011-04-18 16:24:14 -070092static 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
108void 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
Nicholas Bellinger88dd9e22011-11-02 03:33:16 -0700115int ft_check_stop_free(struct se_cmd *se_cmd)
Kiran Patil3699d922011-04-18 16:24:14 -0700116{
Christoph Hellwig82f1c8a2011-09-13 23:09:01 +0200117 transport_generic_free_cmd(se_cmd, 0);
Nicholas Bellinger88dd9e22011-11-02 03:33:16 -0700118 return 1;
Kiran Patil3699d922011-04-18 16:24:14 -0700119}
120
121/*
122 * Send response.
123 */
124int ft_queue_status(struct se_cmd *se_cmd)
125{
126 struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
127 struct fc_frame *fp;
128 struct fcp_resp_with_ext *fcp;
129 struct fc_lport *lport;
130 struct fc_exch *ep;
131 size_t len;
132
133 ft_dump_cmd(cmd, __func__);
134 ep = fc_seq_exch(cmd->seq);
135 lport = ep->lp;
136 len = sizeof(*fcp) + se_cmd->scsi_sense_length;
137 fp = fc_frame_alloc(lport, len);
138 if (!fp) {
139 /* XXX shouldn't just drop it - requeue and retry? */
140 return 0;
141 }
142 fcp = fc_frame_payload_get(fp, len);
143 memset(fcp, 0, len);
144 fcp->resp.fr_status = se_cmd->scsi_status;
145
146 len = se_cmd->scsi_sense_length;
147 if (len) {
148 fcp->resp.fr_flags |= FCP_SNS_LEN_VAL;
149 fcp->ext.fr_sns_len = htonl(len);
150 memcpy((fcp + 1), se_cmd->sense_buffer, len);
151 }
152
153 /*
154 * Test underflow and overflow with one mask. Usually both are off.
155 * Bidirectional commands are not handled yet.
156 */
157 if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT)) {
158 if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT)
159 fcp->resp.fr_flags |= FCP_RESID_OVER;
160 else
161 fcp->resp.fr_flags |= FCP_RESID_UNDER;
162 fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count);
163 }
164
165 /*
166 * Send response.
167 */
168 cmd->seq = lport->tt.seq_start_next(cmd->seq);
169 fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP,
170 FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ, 0);
171
172 lport->tt.seq_send(lport, cmd->seq, fp);
173 lport->tt.exch_done(cmd->seq);
174 return 0;
175}
176
177int ft_write_pending_status(struct se_cmd *se_cmd)
178{
179 struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
180
181 return cmd->write_data_len != se_cmd->data_length;
182}
183
184/*
185 * Send TX_RDY (transfer ready).
186 */
187int ft_write_pending(struct se_cmd *se_cmd)
188{
189 struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
190 struct fc_frame *fp;
191 struct fcp_txrdy *txrdy;
192 struct fc_lport *lport;
193 struct fc_exch *ep;
194 struct fc_frame_header *fh;
195 u32 f_ctl;
196
197 ft_dump_cmd(cmd, __func__);
198
199 ep = fc_seq_exch(cmd->seq);
200 lport = ep->lp;
201 fp = fc_frame_alloc(lport, sizeof(*txrdy));
202 if (!fp)
Nicholas Bellinger03e98c92011-11-04 02:36:16 -0700203 return -ENOMEM; /* Signal QUEUE_FULL */
Kiran Patil3699d922011-04-18 16:24:14 -0700204
205 txrdy = fc_frame_payload_get(fp, sizeof(*txrdy));
206 memset(txrdy, 0, sizeof(*txrdy));
207 txrdy->ft_burst_len = htonl(se_cmd->data_length);
208
209 cmd->seq = lport->tt.seq_start_next(cmd->seq);
210 fc_fill_fc_hdr(fp, FC_RCTL_DD_DATA_DESC, ep->did, ep->sid, FC_TYPE_FCP,
211 FC_FC_EX_CTX | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
212
213 fh = fc_frame_header_get(fp);
214 f_ctl = ntoh24(fh->fh_f_ctl);
215
216 /* Only if it is 'Exchange Responder' */
217 if (f_ctl & FC_FC_EX_CTX) {
218 /* Target is 'exchange responder' and sending XFER_READY
219 * to 'exchange initiator (initiator)'
220 */
221 if ((ep->xid <= lport->lro_xid) &&
222 (fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) {
223 if (se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
224 /*
Andy Groverec98f782011-07-20 19:28:46 +0000225 * cmd may have been broken up into multiple
226 * tasks. Link their sgs together so we can
227 * operate on them all at once.
Kiran Patil3699d922011-04-18 16:24:14 -0700228 */
229 transport_do_task_sg_chain(se_cmd);
Andy Grovera1d8b492011-05-02 17:12:10 -0700230 cmd->sg = se_cmd->t_tasks_sg_chained;
Kiran Patil3699d922011-04-18 16:24:14 -0700231 cmd->sg_cnt =
Andy Grovera1d8b492011-05-02 17:12:10 -0700232 se_cmd->t_tasks_sg_chained_no;
Kiran Patil3699d922011-04-18 16:24:14 -0700233 }
Yi Zou33dc3622011-06-20 16:59:05 -0700234 if (cmd->sg && lport->tt.ddp_target(lport, ep->xid,
235 cmd->sg,
236 cmd->sg_cnt))
Kiran Patil3699d922011-04-18 16:24:14 -0700237 cmd->was_ddp_setup = 1;
238 }
239 }
240 lport->tt.seq_send(lport, cmd->seq, fp);
241 return 0;
242}
243
244u32 ft_get_task_tag(struct se_cmd *se_cmd)
245{
246 struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
247
248 return fc_seq_exch(cmd->seq)->rxid;
249}
250
251int ft_get_cmd_state(struct se_cmd *se_cmd)
252{
Christoph Hellwig58fc73d2011-08-26 09:25:38 -0700253 return 0;
Kiran Patil3699d922011-04-18 16:24:14 -0700254}
255
256int ft_is_state_remove(struct se_cmd *se_cmd)
257{
258 return 0; /* XXX TBD */
259}
260
Kiran Patil3699d922011-04-18 16:24:14 -0700261/*
262 * FC sequence response handler for follow-on sequences (data) and aborts.
263 */
264static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg)
265{
266 struct ft_cmd *cmd = arg;
267 struct fc_frame_header *fh;
268
269 if (IS_ERR(fp)) {
270 /* XXX need to find cmd if queued */
Kiran Patil3699d922011-04-18 16:24:14 -0700271 cmd->seq = NULL;
Christoph Hellwig82f1c8a2011-09-13 23:09:01 +0200272 transport_generic_free_cmd(&cmd->se_cmd, 0);
Kiran Patil3699d922011-04-18 16:24:14 -0700273 return;
274 }
275
276 fh = fc_frame_header_get(fp);
277
278 switch (fh->fh_r_ctl) {
279 case FC_RCTL_DD_SOL_DATA: /* write data */
280 ft_recv_write_data(cmd, fp);
281 break;
282 case FC_RCTL_DD_UNSOL_CTL: /* command */
283 case FC_RCTL_DD_SOL_CTL: /* transfer ready */
284 case FC_RCTL_DD_DATA_DESC: /* transfer ready */
285 default:
Andy Grover6708bb22011-06-08 10:36:43 -0700286 pr_debug("%s: unhandled frame r_ctl %x\n",
Kiran Patil3699d922011-04-18 16:24:14 -0700287 __func__, fh->fh_r_ctl);
Kiran Patildcd998c2011-08-03 09:20:01 +0000288 ft_invl_hw_context(cmd);
Kiran Patil3699d922011-04-18 16:24:14 -0700289 fc_frame_free(fp);
Christoph Hellwig82f1c8a2011-09-13 23:09:01 +0200290 transport_generic_free_cmd(&cmd->se_cmd, 0);
Kiran Patil3699d922011-04-18 16:24:14 -0700291 break;
292 }
293}
294
295/*
296 * Send a FCP response including SCSI status and optional FCP rsp_code.
297 * status is SAM_STAT_GOOD (zero) iff code is valid.
298 * This is used in error cases, such as allocation failures.
299 */
300static void ft_send_resp_status(struct fc_lport *lport,
301 const struct fc_frame *rx_fp,
302 u32 status, enum fcp_resp_rsp_codes code)
303{
304 struct fc_frame *fp;
305 struct fc_seq *sp;
306 const struct fc_frame_header *fh;
307 size_t len;
308 struct fcp_resp_with_ext *fcp;
309 struct fcp_resp_rsp_info *info;
310
311 fh = fc_frame_header_get(rx_fp);
Andy Grover6708bb22011-06-08 10:36:43 -0700312 pr_debug("FCP error response: did %x oxid %x status %x code %x\n",
Kiran Patil3699d922011-04-18 16:24:14 -0700313 ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code);
314 len = sizeof(*fcp);
315 if (status == SAM_STAT_GOOD)
316 len += sizeof(*info);
317 fp = fc_frame_alloc(lport, len);
318 if (!fp)
319 return;
320 fcp = fc_frame_payload_get(fp, len);
321 memset(fcp, 0, len);
322 fcp->resp.fr_status = status;
323 if (status == SAM_STAT_GOOD) {
324 fcp->ext.fr_rsp_len = htonl(sizeof(*info));
325 fcp->resp.fr_flags |= FCP_RSP_LEN_VAL;
326 info = (struct fcp_resp_rsp_info *)(fcp + 1);
327 info->rsp_code = code;
328 }
329
330 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0);
331 sp = fr_seq(fp);
332 if (sp)
333 lport->tt.seq_send(lport, sp, fp);
334 else
335 lport->tt.frame_send(lport, fp);
336}
337
338/*
339 * Send error or task management response.
Kiran Patil3699d922011-04-18 16:24:14 -0700340 */
Kiran Patilf2f7b092011-06-20 16:59:41 -0700341static void ft_send_resp_code(struct ft_cmd *cmd,
342 enum fcp_resp_rsp_codes code)
Kiran Patil3699d922011-04-18 16:24:14 -0700343{
344 ft_send_resp_status(cmd->sess->tport->lport,
345 cmd->req_frame, SAM_STAT_GOOD, code);
Kiran Patilf2f7b092011-06-20 16:59:41 -0700346}
347
348
349/*
350 * Send error or task management response.
351 * Always frees the cmd and associated state.
352 */
353static void ft_send_resp_code_and_free(struct ft_cmd *cmd,
354 enum fcp_resp_rsp_codes code)
355{
356 ft_send_resp_code(cmd, code);
Kiran Patil3699d922011-04-18 16:24:14 -0700357 ft_free_cmd(cmd);
358}
359
360/*
361 * Handle Task Management Request.
362 */
363static void ft_send_tm(struct ft_cmd *cmd)
364{
365 struct se_tmr_req *tmr;
366 struct fcp_cmnd *fcp;
Kiran Patil61db9522011-06-22 16:30:22 -0700367 struct ft_sess *sess;
Kiran Patil3699d922011-04-18 16:24:14 -0700368 u8 tm_func;
369
370 fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
371
372 switch (fcp->fc_tm_flags) {
373 case FCP_TMF_LUN_RESET:
374 tm_func = TMR_LUN_RESET;
Kiran Patil3699d922011-04-18 16:24:14 -0700375 break;
376 case FCP_TMF_TGT_RESET:
377 tm_func = TMR_TARGET_WARM_RESET;
378 break;
379 case FCP_TMF_CLR_TASK_SET:
380 tm_func = TMR_CLEAR_TASK_SET;
381 break;
382 case FCP_TMF_ABT_TASK_SET:
383 tm_func = TMR_ABORT_TASK_SET;
384 break;
385 case FCP_TMF_CLR_ACA:
386 tm_func = TMR_CLEAR_ACA;
387 break;
388 default:
389 /*
390 * FCP4r01 indicates having a combination of
391 * tm_flags set is invalid.
392 */
Andy Grover6708bb22011-06-08 10:36:43 -0700393 pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags);
Kiran Patilf2f7b092011-06-20 16:59:41 -0700394 ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
Kiran Patil3699d922011-04-18 16:24:14 -0700395 return;
396 }
397
Andy Grover6708bb22011-06-08 10:36:43 -0700398 pr_debug("alloc tm cmd fn %d\n", tm_func);
Roland Dreierdd503a52011-10-06 09:56:16 -0700399 tmr = core_tmr_alloc_req(&cmd->se_cmd, cmd, tm_func, GFP_KERNEL);
Kiran Patil3699d922011-04-18 16:24:14 -0700400 if (!tmr) {
Andy Grover6708bb22011-06-08 10:36:43 -0700401 pr_debug("alloc failed\n");
Kiran Patilf2f7b092011-06-20 16:59:41 -0700402 ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED);
Kiran Patil3699d922011-04-18 16:24:14 -0700403 return;
404 }
405 cmd->se_cmd.se_tmr_req = tmr;
Kiran Patil61db9522011-06-22 16:30:22 -0700406
407 switch (fcp->fc_tm_flags) {
408 case FCP_TMF_LUN_RESET:
409 cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
Andy Grover5951146d2011-07-19 10:26:37 +0000410 if (transport_lookup_tmr_lun(&cmd->se_cmd, cmd->lun) < 0) {
Kiran Patil61db9522011-06-22 16:30:22 -0700411 /*
412 * Make sure to clean up newly allocated TMR request
413 * since "unable to handle TMR request because failed
414 * to get to LUN"
415 */
Andy Grover6708bb22011-06-08 10:36:43 -0700416 pr_debug("Failed to get LUN for TMR func %d, "
Kiran Patil61db9522011-06-22 16:30:22 -0700417 "se_cmd %p, unpacked_lun %d\n",
418 tm_func, &cmd->se_cmd, cmd->lun);
419 ft_dump_cmd(cmd, __func__);
420 sess = cmd->sess;
421 transport_send_check_condition_and_sense(&cmd->se_cmd,
422 cmd->se_cmd.scsi_sense_reason, 0);
Christoph Hellwig82f1c8a2011-09-13 23:09:01 +0200423 transport_generic_free_cmd(&cmd->se_cmd, 0);
Kiran Patil61db9522011-06-22 16:30:22 -0700424 ft_sess_put(sess);
425 return;
426 }
427 break;
428 case FCP_TMF_TGT_RESET:
429 case FCP_TMF_CLR_TASK_SET:
430 case FCP_TMF_ABT_TASK_SET:
431 case FCP_TMF_CLR_ACA:
432 break;
433 default:
434 return;
435 }
Kiran Patil3699d922011-04-18 16:24:14 -0700436 transport_generic_handle_tmr(&cmd->se_cmd);
437}
438
439/*
440 * Send status from completed task management request.
441 */
442int ft_queue_tm_resp(struct se_cmd *se_cmd)
443{
444 struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
445 struct se_tmr_req *tmr = se_cmd->se_tmr_req;
446 enum fcp_resp_rsp_codes code;
447
448 switch (tmr->response) {
449 case TMR_FUNCTION_COMPLETE:
450 code = FCP_TMF_CMPL;
451 break;
452 case TMR_LUN_DOES_NOT_EXIST:
453 code = FCP_TMF_INVALID_LUN;
454 break;
455 case TMR_FUNCTION_REJECTED:
456 code = FCP_TMF_REJECTED;
457 break;
458 case TMR_TASK_DOES_NOT_EXIST:
459 case TMR_TASK_STILL_ALLEGIANT:
460 case TMR_TASK_FAILOVER_NOT_SUPPORTED:
461 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
462 case TMR_FUNCTION_AUTHORIZATION_FAILED:
463 default:
464 code = FCP_TMF_FAILED;
465 break;
466 }
Andy Grover6708bb22011-06-08 10:36:43 -0700467 pr_debug("tmr fn %d resp %d fcp code %d\n",
Kiran Patil3699d922011-04-18 16:24:14 -0700468 tmr->function, tmr->response, code);
469 ft_send_resp_code(cmd, code);
470 return 0;
471}
472
Christoph Hellwig58fc73d2011-08-26 09:25:38 -0700473static void ft_send_work(struct work_struct *work);
474
Kiran Patil3699d922011-04-18 16:24:14 -0700475/*
476 * Handle incoming FCP command.
477 */
478static void ft_recv_cmd(struct ft_sess *sess, struct fc_frame *fp)
479{
480 struct ft_cmd *cmd;
481 struct fc_lport *lport = sess->tport->lport;
482
483 cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
484 if (!cmd)
485 goto busy;
486 cmd->sess = sess;
487 cmd->seq = lport->tt.seq_assign(lport, fp);
488 if (!cmd->seq) {
489 kfree(cmd);
490 goto busy;
491 }
492 cmd->req_frame = fp; /* hold frame during cmd */
Christoph Hellwig58fc73d2011-08-26 09:25:38 -0700493
494 INIT_WORK(&cmd->work, ft_send_work);
495 queue_work(sess->tport->tpg->workqueue, &cmd->work);
Kiran Patil3699d922011-04-18 16:24:14 -0700496 return;
497
498busy:
Andy Grover6708bb22011-06-08 10:36:43 -0700499 pr_debug("cmd or seq allocation failure - sending BUSY\n");
Kiran Patil3699d922011-04-18 16:24:14 -0700500 ft_send_resp_status(lport, fp, SAM_STAT_BUSY, 0);
501 fc_frame_free(fp);
502 ft_sess_put(sess); /* undo get from lookup */
503}
504
505
506/*
507 * Handle incoming FCP frame.
508 * Caller has verified that the frame is type FCP.
509 */
510void ft_recv_req(struct ft_sess *sess, struct fc_frame *fp)
511{
512 struct fc_frame_header *fh = fc_frame_header_get(fp);
513
514 switch (fh->fh_r_ctl) {
515 case FC_RCTL_DD_UNSOL_CMD: /* command */
516 ft_recv_cmd(sess, fp);
517 break;
518 case FC_RCTL_DD_SOL_DATA: /* write data */
519 case FC_RCTL_DD_UNSOL_CTL:
520 case FC_RCTL_DD_SOL_CTL:
521 case FC_RCTL_DD_DATA_DESC: /* transfer ready */
522 case FC_RCTL_ELS4_REQ: /* SRR, perhaps */
523 default:
Andy Grover6708bb22011-06-08 10:36:43 -0700524 pr_debug("%s: unhandled frame r_ctl %x\n",
Kiran Patil3699d922011-04-18 16:24:14 -0700525 __func__, fh->fh_r_ctl);
526 fc_frame_free(fp);
527 ft_sess_put(sess); /* undo get from lookup */
528 break;
529 }
530}
531
532/*
533 * Send new command to target.
534 */
Christoph Hellwig58fc73d2011-08-26 09:25:38 -0700535static void ft_send_work(struct work_struct *work)
Kiran Patil3699d922011-04-18 16:24:14 -0700536{
Christoph Hellwig58fc73d2011-08-26 09:25:38 -0700537 struct ft_cmd *cmd = container_of(work, struct ft_cmd, work);
Kiran Patil3699d922011-04-18 16:24:14 -0700538 struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame);
539 struct se_cmd *se_cmd;
540 struct fcp_cmnd *fcp;
Christoph Hellwig58fc73d2011-08-26 09:25:38 -0700541 int data_dir = 0;
Kiran Patil3699d922011-04-18 16:24:14 -0700542 u32 data_len;
543 int task_attr;
544 int ret;
545
546 fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
547 if (!fcp)
548 goto err;
549
550 if (fcp->fc_flags & FCP_CFL_LEN_MASK)
551 goto err; /* not handling longer CDBs yet */
552
553 if (fcp->fc_tm_flags) {
554 task_attr = FCP_PTA_SIMPLE;
555 data_dir = DMA_NONE;
556 data_len = 0;
557 } else {
558 switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) {
559 case 0:
560 data_dir = DMA_NONE;
561 break;
562 case FCP_CFL_RDDATA:
563 data_dir = DMA_FROM_DEVICE;
564 break;
565 case FCP_CFL_WRDATA:
566 data_dir = DMA_TO_DEVICE;
567 break;
568 case FCP_CFL_WRDATA | FCP_CFL_RDDATA:
569 goto err; /* TBD not supported by tcm_fc yet */
570 }
Nicholas Bellinger61db1802011-05-19 20:19:14 -0700571 /*
572 * Locate the SAM Task Attr from fc_pri_ta
573 */
574 switch (fcp->fc_pri_ta & FCP_PTA_MASK) {
575 case FCP_PTA_HEADQ:
576 task_attr = MSG_HEAD_TAG;
577 break;
578 case FCP_PTA_ORDERED:
579 task_attr = MSG_ORDERED_TAG;
580 break;
581 case FCP_PTA_ACA:
582 task_attr = MSG_ACA_TAG;
583 break;
584 case FCP_PTA_SIMPLE: /* Fallthrough */
585 default:
586 task_attr = MSG_SIMPLE_TAG;
587 }
Kiran Patil3699d922011-04-18 16:24:14 -0700588
Nicholas Bellinger61db1802011-05-19 20:19:14 -0700589
Kiran Patil3699d922011-04-18 16:24:14 -0700590 task_attr = fcp->fc_pri_ta & FCP_PTA_MASK;
591 data_len = ntohl(fcp->fc_dl);
592 cmd->cdb = fcp->fc_cdb;
593 }
594
595 se_cmd = &cmd->se_cmd;
596 /*
597 * Initialize struct se_cmd descriptor from target_core_mod
598 * infrastructure
599 */
600 transport_init_se_cmd(se_cmd, &ft_configfs->tf_ops, cmd->sess->se_sess,
601 data_len, data_dir, task_attr,
602 &cmd->ft_sense_buffer[0]);
603 /*
604 * Check for FCP task management flags
605 */
606 if (fcp->fc_tm_flags) {
607 ft_send_tm(cmd);
608 return;
609 }
610
611 fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
612
Kiran Patil61db9522011-06-22 16:30:22 -0700613 cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
Andy Grover5951146d2011-07-19 10:26:37 +0000614 ret = transport_lookup_cmd_lun(&cmd->se_cmd, cmd->lun);
Kiran Patil3699d922011-04-18 16:24:14 -0700615 if (ret < 0) {
616 ft_dump_cmd(cmd, __func__);
617 transport_send_check_condition_and_sense(&cmd->se_cmd,
618 cmd->se_cmd.scsi_sense_reason, 0);
619 return;
620 }
621
622 ret = transport_generic_allocate_tasks(se_cmd, cmd->cdb);
623
Andy Grover6708bb22011-06-08 10:36:43 -0700624 pr_debug("r_ctl %x alloc task ret %d\n", fh->fh_r_ctl, ret);
Kiran Patil3699d922011-04-18 16:24:14 -0700625 ft_dump_cmd(cmd, __func__);
626
Andy Grover5951146d2011-07-19 10:26:37 +0000627 if (ret == -ENOMEM) {
Kiran Patil3699d922011-04-18 16:24:14 -0700628 transport_send_check_condition_and_sense(se_cmd,
629 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
Christoph Hellwig82f1c8a2011-09-13 23:09:01 +0200630 transport_generic_free_cmd(se_cmd, 0);
Kiran Patil3699d922011-04-18 16:24:14 -0700631 return;
632 }
Andy Grover5951146d2011-07-19 10:26:37 +0000633 if (ret == -EINVAL) {
Kiran Patil3699d922011-04-18 16:24:14 -0700634 if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
635 ft_queue_status(se_cmd);
636 else
637 transport_send_check_condition_and_sense(se_cmd,
638 se_cmd->scsi_sense_reason, 0);
Christoph Hellwig82f1c8a2011-09-13 23:09:01 +0200639 transport_generic_free_cmd(se_cmd, 0);
Kiran Patil3699d922011-04-18 16:24:14 -0700640 return;
641 }
Christoph Hellwig4ca495e2011-09-12 21:50:49 +0200642 transport_handle_cdb_direct(se_cmd);
Kiran Patil3699d922011-04-18 16:24:14 -0700643 return;
644
645err:
Kiran Patilf2f7b092011-06-20 16:59:41 -0700646 ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
Kiran Patil3699d922011-04-18 16:24:14 -0700647}