blob: addc18f727ea442c47c1e78aab5343bf592cf6b2 [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>
Christoph Hellwigc4795fb2011-11-16 09:46:48 -050042#include <target/target_core_fabric.h>
Kiran Patil3699d922011-04-18 16:24:14 -070043#include <target/target_core_configfs.h>
Kiran Patil3699d922011-04-18 16:24:14 -070044#include <target/configfs_macros.h>
45
46#include "tcm_fc.h"
47
48/*
49 * Dump cmd state for debugging.
50 */
51void 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;
Andy Groverec98f782011-07-20 19:28:46 +000056 struct scatterlist *sg;
57 int count;
Kiran Patil3699d922011-04-18 16:24:14 -070058
Kiran Patil3699d922011-04-18 16:24:14 -070059 se_cmd = &cmd->se_cmd;
Christoph Hellwig58fc73d2011-08-26 09:25:38 -070060 pr_debug("%s: cmd %p sess %p seq %p se_cmd %p\n",
61 caller, cmd, cmd->sess, cmd->seq, se_cmd);
Andy Grover6708bb22011-06-08 10:36:43 -070062 pr_debug("%s: cmd %p cdb %p\n",
Kiran Patil3699d922011-04-18 16:24:14 -070063 caller, cmd, cmd->cdb);
Andy Grover6708bb22011-06-08 10:36:43 -070064 pr_debug("%s: cmd %p lun %d\n", caller, cmd, cmd->lun);
Kiran Patil3699d922011-04-18 16:24:14 -070065
Andy Grover6708bb22011-06-08 10:36:43 -070066 pr_debug("%s: cmd %p data_nents %u len %u se_cmd_flags <0x%x>\n",
Andy Groverec98f782011-07-20 19:28:46 +000067 caller, cmd, se_cmd->t_data_nents,
Andy Grover05d1c7c2011-07-20 19:13:28 +000068 se_cmd->data_length, se_cmd->se_cmd_flags);
Andy Grover5951146d2011-07-19 10:26:37 +000069
Andy Groverec98f782011-07-20 19:28:46 +000070 for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, count)
Andy Grover6708bb22011-06-08 10:36:43 -070071 pr_debug("%s: cmd %p sg %p page %p "
Andy Groverec98f782011-07-20 19:28:46 +000072 "len 0x%x off 0x%x\n",
73 caller, cmd, sg,
74 sg_page(sg), sg->length, sg->offset);
75
Kiran Patil3699d922011-04-18 16:24:14 -070076 sp = cmd->seq;
77 if (sp) {
78 ep = fc_seq_exch(sp);
Andy Grover6708bb22011-06-08 10:36:43 -070079 pr_debug("%s: cmd %p sid %x did %x "
Kiran Patil3699d922011-04-18 16:24:14 -070080 "ox_id %x rx_id %x seq_id %x e_stat %x\n",
81 caller, cmd, ep->sid, ep->did, ep->oxid, ep->rxid,
82 sp->id, ep->esb_stat);
83 }
84 print_hex_dump(KERN_INFO, "ft_dump_cmd ", DUMP_PREFIX_NONE,
85 16, 4, cmd->cdb, MAX_COMMAND_SIZE, 0);
86}
87
Kiran Patil3699d922011-04-18 16:24:14 -070088static void ft_free_cmd(struct ft_cmd *cmd)
89{
90 struct fc_frame *fp;
91 struct fc_lport *lport;
92
93 if (!cmd)
94 return;
95 fp = cmd->req_frame;
96 lport = fr_dev(fp);
97 if (fr_seq(fp))
98 lport->tt.seq_release(fr_seq(fp));
99 fc_frame_free(fp);
100 ft_sess_put(cmd->sess); /* undo get from lookup at recv */
101 kfree(cmd);
102}
103
104void ft_release_cmd(struct se_cmd *se_cmd)
105{
106 struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
107
108 ft_free_cmd(cmd);
109}
110
Nicholas Bellinger88dd9e22011-11-02 03:33:16 -0700111int ft_check_stop_free(struct se_cmd *se_cmd)
Kiran Patil3699d922011-04-18 16:24:14 -0700112{
Christoph Hellwig82f1c8a2011-09-13 23:09:01 +0200113 transport_generic_free_cmd(se_cmd, 0);
Nicholas Bellinger88dd9e22011-11-02 03:33:16 -0700114 return 1;
Kiran Patil3699d922011-04-18 16:24:14 -0700115}
116
117/*
118 * Send response.
119 */
120int ft_queue_status(struct se_cmd *se_cmd)
121{
122 struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
123 struct fc_frame *fp;
124 struct fcp_resp_with_ext *fcp;
125 struct fc_lport *lport;
126 struct fc_exch *ep;
127 size_t len;
128
129 ft_dump_cmd(cmd, __func__);
130 ep = fc_seq_exch(cmd->seq);
131 lport = ep->lp;
132 len = sizeof(*fcp) + se_cmd->scsi_sense_length;
133 fp = fc_frame_alloc(lport, len);
134 if (!fp) {
135 /* XXX shouldn't just drop it - requeue and retry? */
136 return 0;
137 }
138 fcp = fc_frame_payload_get(fp, len);
139 memset(fcp, 0, len);
140 fcp->resp.fr_status = se_cmd->scsi_status;
141
142 len = se_cmd->scsi_sense_length;
143 if (len) {
144 fcp->resp.fr_flags |= FCP_SNS_LEN_VAL;
145 fcp->ext.fr_sns_len = htonl(len);
146 memcpy((fcp + 1), se_cmd->sense_buffer, len);
147 }
148
149 /*
150 * Test underflow and overflow with one mask. Usually both are off.
151 * Bidirectional commands are not handled yet.
152 */
153 if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT)) {
154 if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT)
155 fcp->resp.fr_flags |= FCP_RESID_OVER;
156 else
157 fcp->resp.fr_flags |= FCP_RESID_UNDER;
158 fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count);
159 }
160
161 /*
162 * Send response.
163 */
164 cmd->seq = lport->tt.seq_start_next(cmd->seq);
165 fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP,
166 FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ, 0);
167
168 lport->tt.seq_send(lport, cmd->seq, fp);
169 lport->tt.exch_done(cmd->seq);
170 return 0;
171}
172
173int ft_write_pending_status(struct se_cmd *se_cmd)
174{
175 struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
176
177 return cmd->write_data_len != se_cmd->data_length;
178}
179
180/*
181 * Send TX_RDY (transfer ready).
182 */
183int ft_write_pending(struct se_cmd *se_cmd)
184{
185 struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
186 struct fc_frame *fp;
187 struct fcp_txrdy *txrdy;
188 struct fc_lport *lport;
189 struct fc_exch *ep;
190 struct fc_frame_header *fh;
191 u32 f_ctl;
192
193 ft_dump_cmd(cmd, __func__);
194
195 ep = fc_seq_exch(cmd->seq);
196 lport = ep->lp;
197 fp = fc_frame_alloc(lport, sizeof(*txrdy));
198 if (!fp)
Nicholas Bellinger03e98c92011-11-04 02:36:16 -0700199 return -ENOMEM; /* Signal QUEUE_FULL */
Kiran Patil3699d922011-04-18 16:24:14 -0700200
201 txrdy = fc_frame_payload_get(fp, sizeof(*txrdy));
202 memset(txrdy, 0, sizeof(*txrdy));
203 txrdy->ft_burst_len = htonl(se_cmd->data_length);
204
205 cmd->seq = lport->tt.seq_start_next(cmd->seq);
206 fc_fill_fc_hdr(fp, FC_RCTL_DD_DATA_DESC, ep->did, ep->sid, FC_TYPE_FCP,
207 FC_FC_EX_CTX | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
208
209 fh = fc_frame_header_get(fp);
210 f_ctl = ntoh24(fh->fh_f_ctl);
211
212 /* Only if it is 'Exchange Responder' */
213 if (f_ctl & FC_FC_EX_CTX) {
214 /* Target is 'exchange responder' and sending XFER_READY
215 * to 'exchange initiator (initiator)'
216 */
217 if ((ep->xid <= lport->lro_xid) &&
218 (fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) {
219 if (se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
220 /*
Andy Groverec98f782011-07-20 19:28:46 +0000221 * cmd may have been broken up into multiple
222 * tasks. Link their sgs together so we can
223 * operate on them all at once.
Kiran Patil3699d922011-04-18 16:24:14 -0700224 */
225 transport_do_task_sg_chain(se_cmd);
Andy Grovera1d8b492011-05-02 17:12:10 -0700226 cmd->sg = se_cmd->t_tasks_sg_chained;
Kiran Patil3699d922011-04-18 16:24:14 -0700227 cmd->sg_cnt =
Andy Grovera1d8b492011-05-02 17:12:10 -0700228 se_cmd->t_tasks_sg_chained_no;
Kiran Patil3699d922011-04-18 16:24:14 -0700229 }
Yi Zou33dc3622011-06-20 16:59:05 -0700230 if (cmd->sg && lport->tt.ddp_target(lport, ep->xid,
231 cmd->sg,
232 cmd->sg_cnt))
Kiran Patil3699d922011-04-18 16:24:14 -0700233 cmd->was_ddp_setup = 1;
234 }
235 }
236 lport->tt.seq_send(lport, cmd->seq, fp);
237 return 0;
238}
239
240u32 ft_get_task_tag(struct se_cmd *se_cmd)
241{
242 struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
243
244 return fc_seq_exch(cmd->seq)->rxid;
245}
246
247int ft_get_cmd_state(struct se_cmd *se_cmd)
248{
Christoph Hellwig58fc73d2011-08-26 09:25:38 -0700249 return 0;
Kiran Patil3699d922011-04-18 16:24:14 -0700250}
251
252int ft_is_state_remove(struct se_cmd *se_cmd)
253{
254 return 0; /* XXX TBD */
255}
256
Kiran Patil3699d922011-04-18 16:24:14 -0700257/*
258 * FC sequence response handler for follow-on sequences (data) and aborts.
259 */
260static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg)
261{
262 struct ft_cmd *cmd = arg;
263 struct fc_frame_header *fh;
264
265 if (IS_ERR(fp)) {
266 /* XXX need to find cmd if queued */
Kiran Patil3699d922011-04-18 16:24:14 -0700267 cmd->seq = NULL;
Christoph Hellwig82f1c8a2011-09-13 23:09:01 +0200268 transport_generic_free_cmd(&cmd->se_cmd, 0);
Kiran Patil3699d922011-04-18 16:24:14 -0700269 return;
270 }
271
272 fh = fc_frame_header_get(fp);
273
274 switch (fh->fh_r_ctl) {
275 case FC_RCTL_DD_SOL_DATA: /* write data */
276 ft_recv_write_data(cmd, fp);
277 break;
278 case FC_RCTL_DD_UNSOL_CTL: /* command */
279 case FC_RCTL_DD_SOL_CTL: /* transfer ready */
280 case FC_RCTL_DD_DATA_DESC: /* transfer ready */
281 default:
Andy Grover6708bb22011-06-08 10:36:43 -0700282 pr_debug("%s: unhandled frame r_ctl %x\n",
Kiran Patil3699d922011-04-18 16:24:14 -0700283 __func__, fh->fh_r_ctl);
Kiran Patildcd998c2011-08-03 09:20:01 +0000284 ft_invl_hw_context(cmd);
Kiran Patil3699d922011-04-18 16:24:14 -0700285 fc_frame_free(fp);
Christoph Hellwig82f1c8a2011-09-13 23:09:01 +0200286 transport_generic_free_cmd(&cmd->se_cmd, 0);
Kiran Patil3699d922011-04-18 16:24:14 -0700287 break;
288 }
289}
290
291/*
292 * Send a FCP response including SCSI status and optional FCP rsp_code.
293 * status is SAM_STAT_GOOD (zero) iff code is valid.
294 * This is used in error cases, such as allocation failures.
295 */
296static void ft_send_resp_status(struct fc_lport *lport,
297 const struct fc_frame *rx_fp,
298 u32 status, enum fcp_resp_rsp_codes code)
299{
300 struct fc_frame *fp;
301 struct fc_seq *sp;
302 const struct fc_frame_header *fh;
303 size_t len;
304 struct fcp_resp_with_ext *fcp;
305 struct fcp_resp_rsp_info *info;
306
307 fh = fc_frame_header_get(rx_fp);
Andy Grover6708bb22011-06-08 10:36:43 -0700308 pr_debug("FCP error response: did %x oxid %x status %x code %x\n",
Kiran Patil3699d922011-04-18 16:24:14 -0700309 ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code);
310 len = sizeof(*fcp);
311 if (status == SAM_STAT_GOOD)
312 len += sizeof(*info);
313 fp = fc_frame_alloc(lport, len);
314 if (!fp)
315 return;
316 fcp = fc_frame_payload_get(fp, len);
317 memset(fcp, 0, len);
318 fcp->resp.fr_status = status;
319 if (status == SAM_STAT_GOOD) {
320 fcp->ext.fr_rsp_len = htonl(sizeof(*info));
321 fcp->resp.fr_flags |= FCP_RSP_LEN_VAL;
322 info = (struct fcp_resp_rsp_info *)(fcp + 1);
323 info->rsp_code = code;
324 }
325
326 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0);
327 sp = fr_seq(fp);
328 if (sp)
329 lport->tt.seq_send(lport, sp, fp);
330 else
331 lport->tt.frame_send(lport, fp);
332}
333
334/*
335 * Send error or task management response.
Kiran Patil3699d922011-04-18 16:24:14 -0700336 */
Kiran Patilf2f7b092011-06-20 16:59:41 -0700337static void ft_send_resp_code(struct ft_cmd *cmd,
338 enum fcp_resp_rsp_codes code)
Kiran Patil3699d922011-04-18 16:24:14 -0700339{
340 ft_send_resp_status(cmd->sess->tport->lport,
341 cmd->req_frame, SAM_STAT_GOOD, code);
Kiran Patilf2f7b092011-06-20 16:59:41 -0700342}
343
344
345/*
346 * Send error or task management response.
347 * Always frees the cmd and associated state.
348 */
349static void ft_send_resp_code_and_free(struct ft_cmd *cmd,
350 enum fcp_resp_rsp_codes code)
351{
352 ft_send_resp_code(cmd, code);
Kiran Patil3699d922011-04-18 16:24:14 -0700353 ft_free_cmd(cmd);
354}
355
356/*
357 * Handle Task Management Request.
358 */
359static void ft_send_tm(struct ft_cmd *cmd)
360{
361 struct se_tmr_req *tmr;
362 struct fcp_cmnd *fcp;
Kiran Patil61db9522011-06-22 16:30:22 -0700363 struct ft_sess *sess;
Kiran Patil3699d922011-04-18 16:24:14 -0700364 u8 tm_func;
365
Nicholas Bellinger4355a912011-11-22 21:41:54 -0800366 transport_init_se_cmd(&cmd->se_cmd, &ft_configfs->tf_ops,
367 cmd->sess->se_sess, 0, DMA_NONE, 0,
368 &cmd->ft_sense_buffer[0]);
369 target_get_sess_cmd(cmd->sess->se_sess, &cmd->se_cmd, false);
370
Kiran Patil3699d922011-04-18 16:24:14 -0700371 fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
372
373 switch (fcp->fc_tm_flags) {
374 case FCP_TMF_LUN_RESET:
375 tm_func = TMR_LUN_RESET;
Kiran Patil3699d922011-04-18 16:24:14 -0700376 break;
377 case FCP_TMF_TGT_RESET:
378 tm_func = TMR_TARGET_WARM_RESET;
379 break;
380 case FCP_TMF_CLR_TASK_SET:
381 tm_func = TMR_CLEAR_TASK_SET;
382 break;
383 case FCP_TMF_ABT_TASK_SET:
384 tm_func = TMR_ABORT_TASK_SET;
385 break;
386 case FCP_TMF_CLR_ACA:
387 tm_func = TMR_CLEAR_ACA;
388 break;
389 default:
390 /*
391 * FCP4r01 indicates having a combination of
392 * tm_flags set is invalid.
393 */
Andy Grover6708bb22011-06-08 10:36:43 -0700394 pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags);
Kiran Patilf2f7b092011-06-20 16:59:41 -0700395 ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
Kiran Patil3699d922011-04-18 16:24:14 -0700396 return;
397 }
398
Andy Grover6708bb22011-06-08 10:36:43 -0700399 pr_debug("alloc tm cmd fn %d\n", tm_func);
Roland Dreierdd503a52011-10-06 09:56:16 -0700400 tmr = core_tmr_alloc_req(&cmd->se_cmd, cmd, tm_func, GFP_KERNEL);
Kiran Patil3699d922011-04-18 16:24:14 -0700401 if (!tmr) {
Andy Grover6708bb22011-06-08 10:36:43 -0700402 pr_debug("alloc failed\n");
Kiran Patilf2f7b092011-06-20 16:59:41 -0700403 ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED);
Kiran Patil3699d922011-04-18 16:24:14 -0700404 return;
405 }
406 cmd->se_cmd.se_tmr_req = tmr;
Kiran Patil61db9522011-06-22 16:30:22 -0700407
408 switch (fcp->fc_tm_flags) {
409 case FCP_TMF_LUN_RESET:
410 cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
Andy Grover5951146d2011-07-19 10:26:37 +0000411 if (transport_lookup_tmr_lun(&cmd->se_cmd, cmd->lun) < 0) {
Kiran Patil61db9522011-06-22 16:30:22 -0700412 /*
413 * Make sure to clean up newly allocated TMR request
414 * since "unable to handle TMR request because failed
415 * to get to LUN"
416 */
Andy Grover6708bb22011-06-08 10:36:43 -0700417 pr_debug("Failed to get LUN for TMR func %d, "
Kiran Patil61db9522011-06-22 16:30:22 -0700418 "se_cmd %p, unpacked_lun %d\n",
419 tm_func, &cmd->se_cmd, cmd->lun);
420 ft_dump_cmd(cmd, __func__);
421 sess = cmd->sess;
422 transport_send_check_condition_and_sense(&cmd->se_cmd,
423 cmd->se_cmd.scsi_sense_reason, 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);
Kiran Patil3699d922011-04-18 16:24:14 -0700539 struct fcp_cmnd *fcp;
Christoph Hellwig58fc73d2011-08-26 09:25:38 -0700540 int data_dir = 0;
Kiran Patil3699d922011-04-18 16:24:14 -0700541 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 }
Nicholas Bellinger61db1802011-05-19 20:19:14 -0700570 /*
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 }
Kiran Patil3699d922011-04-18 16:24:14 -0700587
Nicholas Bellinger61db1802011-05-19 20:19:14 -0700588
Kiran Patil3699d922011-04-18 16:24:14 -0700589 task_attr = fcp->fc_pri_ta & FCP_PTA_MASK;
590 data_len = ntohl(fcp->fc_dl);
591 cmd->cdb = fcp->fc_cdb;
592 }
Kiran Patil3699d922011-04-18 16:24:14 -0700593 /*
594 * Check for FCP task management flags
595 */
596 if (fcp->fc_tm_flags) {
597 ft_send_tm(cmd);
598 return;
599 }
Kiran Patil3699d922011-04-18 16:24:14 -0700600 fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
Kiran Patil61db9522011-06-22 16:30:22 -0700601 cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
Nicholas Bellinger4355a912011-11-22 21:41:54 -0800602 /*
603 * Use a single se_cmd->cmd_kref as we expect to release se_cmd
604 * directly from ft_check_stop_free callback in response path.
605 */
606 ret = target_submit_cmd(&cmd->se_cmd, cmd->sess->se_sess, cmd->cdb,
607 &cmd->ft_sense_buffer[0], cmd->lun, data_len,
608 task_attr, data_dir, 0);
609 pr_debug("r_ctl %x alloc target_submit_cmd %d\n", fh->fh_r_ctl, ret);
Kiran Patil3699d922011-04-18 16:24:14 -0700610 if (ret < 0) {
611 ft_dump_cmd(cmd, __func__);
Kiran Patil3699d922011-04-18 16:24:14 -0700612 return;
613 }
Kiran Patil3699d922011-04-18 16:24:14 -0700614 return;
615
616err:
Kiran Patilf2f7b092011-06-20 16:59:41 -0700617 ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
Kiran Patil3699d922011-04-18 16:24:14 -0700618}