blob: aa3caca8bace13dc29a8cd9cb01d5b252b5c8a6c [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 <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>
Nicholas Bellinger5f544cf2013-09-23 12:12:42 -070031#include <linux/percpu_ida.h>
Kiran Patil3699d922011-04-18 16:24:14 -070032#include <asm/unaligned.h>
Nicholas Bellinger61db1802011-05-19 20:19:14 -070033#include <scsi/scsi_tcq.h>
Kiran Patil3699d922011-04-18 16:24:14 -070034#include <scsi/libfc.h>
35#include <scsi/fc_encode.h>
36
37#include <target/target_core_base.h>
Christoph Hellwigc4795fb2011-11-16 09:46:48 -050038#include <target/target_core_fabric.h>
Kiran Patil3699d922011-04-18 16:24:14 -070039#include <target/configfs_macros.h>
40
41#include "tcm_fc.h"
42
43/*
44 * Dump cmd state for debugging.
45 */
Mark Rustad1fa8f452012-08-01 14:51:53 -070046static void _ft_dump_cmd(struct ft_cmd *cmd, const char *caller)
Kiran Patil3699d922011-04-18 16:24:14 -070047{
48 struct fc_exch *ep;
49 struct fc_seq *sp;
50 struct se_cmd *se_cmd;
Andy Groverec98f782011-07-20 19:28:46 +000051 struct scatterlist *sg;
52 int count;
Kiran Patil3699d922011-04-18 16:24:14 -070053
Kiran Patil3699d922011-04-18 16:24:14 -070054 se_cmd = &cmd->se_cmd;
Christoph Hellwig58fc73d2011-08-26 09:25:38 -070055 pr_debug("%s: cmd %p sess %p seq %p se_cmd %p\n",
56 caller, cmd, cmd->sess, cmd->seq, se_cmd);
Kiran Patil3699d922011-04-18 16:24:14 -070057
Andy Grover6708bb22011-06-08 10:36:43 -070058 pr_debug("%s: cmd %p data_nents %u len %u se_cmd_flags <0x%x>\n",
Andy Groverec98f782011-07-20 19:28:46 +000059 caller, cmd, se_cmd->t_data_nents,
Andy Grover05d1c7c2011-07-20 19:13:28 +000060 se_cmd->data_length, se_cmd->se_cmd_flags);
Andy Grover5951146d2011-07-19 10:26:37 +000061
Andy Groverec98f782011-07-20 19:28:46 +000062 for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, count)
Andy Grover6708bb22011-06-08 10:36:43 -070063 pr_debug("%s: cmd %p sg %p page %p "
Andy Groverec98f782011-07-20 19:28:46 +000064 "len 0x%x off 0x%x\n",
65 caller, cmd, sg,
66 sg_page(sg), sg->length, sg->offset);
67
Kiran Patil3699d922011-04-18 16:24:14 -070068 sp = cmd->seq;
69 if (sp) {
70 ep = fc_seq_exch(sp);
Andy Grover6708bb22011-06-08 10:36:43 -070071 pr_debug("%s: cmd %p sid %x did %x "
Kiran Patil3699d922011-04-18 16:24:14 -070072 "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 }
Kiran Patil3699d922011-04-18 16:24:14 -070076}
77
Mark Rustad1fa8f452012-08-01 14:51:53 -070078void 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
Kiran Patil3699d922011-04-18 16:24:14 -070084static void ft_free_cmd(struct ft_cmd *cmd)
85{
86 struct fc_frame *fp;
87 struct fc_lport *lport;
Nicholas Bellingered8ec8f2014-05-12 12:18:32 -070088 struct ft_sess *sess;
Kiran Patil3699d922011-04-18 16:24:14 -070089
90 if (!cmd)
91 return;
Nicholas Bellingered8ec8f2014-05-12 12:18:32 -070092 sess = cmd->sess;
Kiran Patil3699d922011-04-18 16:24:14 -070093 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);
Nicholas Bellingered8ec8f2014-05-12 12:18:32 -070098 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 */
Kiran Patil3699d922011-04-18 16:24:14 -0700100}
101
102void 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
Nicholas Bellinger88dd9e22011-11-02 03:33:16 -0700109int ft_check_stop_free(struct se_cmd *se_cmd)
Kiran Patil3699d922011-04-18 16:24:14 -0700110{
Christoph Hellwig82f1c8a2011-09-13 23:09:01 +0200111 transport_generic_free_cmd(se_cmd, 0);
Nicholas Bellinger88dd9e22011-11-02 03:33:16 -0700112 return 1;
Kiran Patil3699d922011-04-18 16:24:14 -0700113}
114
115/*
116 * Send response.
117 */
118int 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;
Nicholas Bellinger6dbe7f42014-06-05 16:37:38 -0700126 int rc;
Kiran Patil3699d922011-04-18 16:24:14 -0700127
Mark Rustade1c40382012-04-03 10:24:41 -0700128 if (cmd->aborted)
129 return 0;
Kiran Patil3699d922011-04-18 16:24:14 -0700130 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) {
Nicholas Bellinger6dbe7f42014-06-05 16:37:38 -0700136 se_cmd->scsi_status = SAM_STAT_TASK_SET_FULL;
137 return -ENOMEM;
Kiran Patil3699d922011-04-18 16:24:14 -0700138 }
Nicholas Bellinger6dbe7f42014-06-05 16:37:38 -0700139
Kiran Patil3699d922011-04-18 16:24:14 -0700140 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
Nicholas Bellinger6dbe7f42014-06-05 16:37:38 -0700170 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 }
Kiran Patil3699d922011-04-18 16:24:14 -0700182 lport->tt.exch_done(cmd->seq);
183 return 0;
184}
185
186int 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 */
196int 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
Mark Rustade1c40382012-04-03 10:24:41 -0700208 if (cmd->aborted)
209 return 0;
Kiran Patil3699d922011-04-18 16:24:14 -0700210 ep = fc_seq_exch(cmd->seq);
211 lport = ep->lp;
212 fp = fc_frame_alloc(lport, sizeof(*txrdy));
213 if (!fp)
Nicholas Bellinger03e98c92011-11-04 02:36:16 -0700214 return -ENOMEM; /* Signal QUEUE_FULL */
Kiran Patil3699d922011-04-18 16:24:14 -0700215
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)) {
Christoph Hellwig64f1db32012-05-20 11:59:11 -0400234 if ((se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
Roland Dreiere182d682012-03-30 11:29:11 -0700235 lport->tt.ddp_target(lport, ep->xid,
236 se_cmd->t_data_sg,
237 se_cmd->t_data_nents))
Kiran Patil3699d922011-04-18 16:24:14 -0700238 cmd->was_ddp_setup = 1;
239 }
240 }
241 lport->tt.seq_send(lport, cmd->seq, fp);
242 return 0;
243}
244
Kiran Patil3699d922011-04-18 16:24:14 -0700245int ft_get_cmd_state(struct se_cmd *se_cmd)
246{
Christoph Hellwig58fc73d2011-08-26 09:25:38 -0700247 return 0;
Kiran Patil3699d922011-04-18 16:24:14 -0700248}
249
Kiran Patil3699d922011-04-18 16:24:14 -0700250/*
251 * FC sequence response handler for follow-on sequences (data) and aborts.
252 */
253static 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
Viresh Kumar9d8c94e2015-07-31 14:08:31 +0530258 if (IS_ERR(fp)) {
Kiran Patil3699d922011-04-18 16:24:14 -0700259 /* XXX need to find cmd if queued */
Kiran Patil3699d922011-04-18 16:24:14 -0700260 cmd->seq = NULL;
Mark Rustade1c40382012-04-03 10:24:41 -0700261 cmd->aborted = true;
Kiran Patil3699d922011-04-18 16:24:14 -0700262 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:
Andy Grover6708bb22011-06-08 10:36:43 -0700275 pr_debug("%s: unhandled frame r_ctl %x\n",
Kiran Patil3699d922011-04-18 16:24:14 -0700276 __func__, fh->fh_r_ctl);
Kiran Patildcd998c2011-08-03 09:20:01 +0000277 ft_invl_hw_context(cmd);
Kiran Patil3699d922011-04-18 16:24:14 -0700278 fc_frame_free(fp);
Christoph Hellwig82f1c8a2011-09-13 23:09:01 +0200279 transport_generic_free_cmd(&cmd->se_cmd, 0);
Kiran Patil3699d922011-04-18 16:24:14 -0700280 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 */
289static 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);
Andy Grover6708bb22011-06-08 10:36:43 -0700301 pr_debug("FCP error response: did %x oxid %x status %x code %x\n",
Kiran Patil3699d922011-04-18 16:24:14 -0700302 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);
Nicholas Bellinger031ed4d2012-03-09 23:45:38 -0800321 if (sp) {
Kiran Patil3699d922011-04-18 16:24:14 -0700322 lport->tt.seq_send(lport, sp, fp);
Nicholas Bellinger031ed4d2012-03-09 23:45:38 -0800323 lport->tt.exch_done(sp);
324 } else {
Kiran Patil3699d922011-04-18 16:24:14 -0700325 lport->tt.frame_send(lport, fp);
Nicholas Bellinger031ed4d2012-03-09 23:45:38 -0800326 }
Kiran Patil3699d922011-04-18 16:24:14 -0700327}
328
329/*
330 * Send error or task management response.
Kiran Patil3699d922011-04-18 16:24:14 -0700331 */
Kiran Patilf2f7b092011-06-20 16:59:41 -0700332static void ft_send_resp_code(struct ft_cmd *cmd,
333 enum fcp_resp_rsp_codes code)
Kiran Patil3699d922011-04-18 16:24:14 -0700334{
335 ft_send_resp_status(cmd->sess->tport->lport,
336 cmd->req_frame, SAM_STAT_GOOD, code);
Kiran Patilf2f7b092011-06-20 16:59:41 -0700337}
338
339
340/*
341 * Send error or task management response.
342 * Always frees the cmd and associated state.
343 */
344static 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);
Kiran Patil3699d922011-04-18 16:24:14 -0700348 ft_free_cmd(cmd);
349}
350
351/*
352 * Handle Task Management Request.
353 */
354static void ft_send_tm(struct ft_cmd *cmd)
355{
Kiran Patil3699d922011-04-18 16:24:14 -0700356 struct fcp_cmnd *fcp;
Nicholas Bellinger00ad4c42012-02-25 01:43:04 -0800357 int rc;
Kiran Patil3699d922011-04-18 16:24:14 -0700358 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;
Kiran Patil3699d922011-04-18 16:24:14 -0700365 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 */
Andy Grover6708bb22011-06-08 10:36:43 -0700383 pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags);
Kiran Patilf2f7b092011-06-20 16:59:41 -0700384 ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
Kiran Patil3699d922011-04-18 16:24:14 -0700385 return;
386 }
387
Nicholas Bellingerc0974f82012-02-25 05:10:04 -0800388 /* FIXME: Add referenced task tag for ABORT_TASK */
Nicholas Bellinger00ad4c42012-02-25 01:43:04 -0800389 rc = target_submit_tmr(&cmd->se_cmd, cmd->sess->se_sess,
Andy Grover59dcb5e2012-01-19 13:39:22 -0800390 &cmd->ft_sense_buffer[0], scsilun_to_int(&fcp->fc_lun),
Nicholas Bellingerc0974f82012-02-25 05:10:04 -0800391 cmd, tm_func, GFP_KERNEL, 0, 0);
Nicholas Bellinger00ad4c42012-02-25 01:43:04 -0800392 if (rc < 0)
393 ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED);
Kiran Patil3699d922011-04-18 16:24:14 -0700394}
395
396/*
397 * Send status from completed task management request.
398 */
Joern Engelb79fafa2013-07-03 11:22:17 -0400399void ft_queue_tm_resp(struct se_cmd *se_cmd)
Kiran Patil3699d922011-04-18 16:24:14 -0700400{
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
Mark Rustade1c40382012-04-03 10:24:41 -0700405 if (cmd->aborted)
Joern Engelb79fafa2013-07-03 11:22:17 -0400406 return;
Kiran Patil3699d922011-04-18 16:24:14 -0700407 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:
Kiran Patil3699d922011-04-18 16:24:14 -0700418 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
Kiran Patil3699d922011-04-18 16:24:14 -0700419 default:
420 code = FCP_TMF_FAILED;
421 break;
422 }
Andy Grover6708bb22011-06-08 10:36:43 -0700423 pr_debug("tmr fn %d resp %d fcp code %d\n",
Kiran Patil3699d922011-04-18 16:24:14 -0700424 tmr->function, tmr->response, code);
425 ft_send_resp_code(cmd, code);
Kiran Patil3699d922011-04-18 16:24:14 -0700426}
427
Nicholas Bellinger131e6ab2014-03-22 14:55:56 -0700428void ft_aborted_task(struct se_cmd *se_cmd)
429{
430 return;
431}
432
Christoph Hellwig58fc73d2011-08-26 09:25:38 -0700433static void ft_send_work(struct work_struct *work);
434
Kiran Patil3699d922011-04-18 16:24:14 -0700435/*
436 * Handle incoming FCP command.
437 */
438static 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;
Nicholas Bellinger5f544cf2013-09-23 12:12:42 -0700442 struct se_session *se_sess = sess->se_sess;
443 int tag;
Kiran Patil3699d922011-04-18 16:24:14 -0700444
Kent Overstreet6f6b5d12014-01-19 08:26:37 +0000445 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING);
Nicholas Bellinger5f544cf2013-09-23 12:12:42 -0700446 if (tag < 0)
Kiran Patil3699d922011-04-18 16:24:14 -0700447 goto busy;
Nicholas Bellinger5f544cf2013-09-23 12:12:42 -0700448
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;
Kiran Patil3699d922011-04-18 16:24:14 -0700453 cmd->sess = sess;
454 cmd->seq = lport->tt.seq_assign(lport, fp);
455 if (!cmd->seq) {
Nicholas Bellinger5f544cf2013-09-23 12:12:42 -0700456 percpu_ida_free(&se_sess->sess_tag_pool, tag);
Kiran Patil3699d922011-04-18 16:24:14 -0700457 goto busy;
458 }
459 cmd->req_frame = fp; /* hold frame during cmd */
Christoph Hellwig58fc73d2011-08-26 09:25:38 -0700460
461 INIT_WORK(&cmd->work, ft_send_work);
462 queue_work(sess->tport->tpg->workqueue, &cmd->work);
Kiran Patil3699d922011-04-18 16:24:14 -0700463 return;
464
465busy:
Andy Grover6708bb22011-06-08 10:36:43 -0700466 pr_debug("cmd or seq allocation failure - sending BUSY\n");
Kiran Patil3699d922011-04-18 16:24:14 -0700467 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 */
477void 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:
Andy Grover6708bb22011-06-08 10:36:43 -0700491 pr_debug("%s: unhandled frame r_ctl %x\n",
Kiran Patil3699d922011-04-18 16:24:14 -0700492 __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 */
Christoph Hellwig58fc73d2011-08-26 09:25:38 -0700502static void ft_send_work(struct work_struct *work)
Kiran Patil3699d922011-04-18 16:24:14 -0700503{
Christoph Hellwig58fc73d2011-08-26 09:25:38 -0700504 struct ft_cmd *cmd = container_of(work, struct ft_cmd, work);
Kiran Patil3699d922011-04-18 16:24:14 -0700505 struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame);
Kiran Patil3699d922011-04-18 16:24:14 -0700506 struct fcp_cmnd *fcp;
Christoph Hellwig58fc73d2011-08-26 09:25:38 -0700507 int data_dir = 0;
Kiran Patil3699d922011-04-18 16:24:14 -0700508 int task_attr;
Kiran Patil3699d922011-04-18 16:24:14 -0700509
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
Kiran Patil3699d922011-04-18 16:24:14 -0700517 /*
518 * Check for FCP task management flags
519 */
520 if (fcp->fc_tm_flags) {
521 ft_send_tm(cmd);
522 return;
523 }
Andy Grover0dccb692012-02-09 06:42:33 +0000524
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:
Christoph Hellwig68d81f42014-11-24 07:07:25 -0800543 task_attr = TCM_HEAD_TAG;
Andy Grover0dccb692012-02-09 06:42:33 +0000544 break;
545 case FCP_PTA_ORDERED:
Christoph Hellwig68d81f42014-11-24 07:07:25 -0800546 task_attr = TCM_ORDERED_TAG;
Andy Grover0dccb692012-02-09 06:42:33 +0000547 break;
548 case FCP_PTA_ACA:
Christoph Hellwig68d81f42014-11-24 07:07:25 -0800549 task_attr = TCM_ACA_TAG;
Andy Grover0dccb692012-02-09 06:42:33 +0000550 break;
551 case FCP_PTA_SIMPLE: /* Fallthrough */
552 default:
Christoph Hellwig68d81f42014-11-24 07:07:25 -0800553 task_attr = TCM_SIMPLE_TAG;
Andy Grover0dccb692012-02-09 06:42:33 +0000554 }
555
Kiran Patil3699d922011-04-18 16:24:14 -0700556 fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
Bart Van Assche649ee052015-04-14 13:26:44 +0200557 cmd->se_cmd.tag = fc_seq_exch(cmd->seq)->rxid;
Nicholas Bellinger4355a912011-11-22 21:41:54 -0800558 /*
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 */
Roland Dreierd6dfc862012-07-16 11:04:39 -0700562 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
Andy Grover1edcdb42012-01-19 13:39:23 -0800567 pr_debug("r_ctl %x alloc target_submit_cmd\n", fh->fh_r_ctl);
Kiran Patil3699d922011-04-18 16:24:14 -0700568 return;
569
570err:
Kiran Patilf2f7b092011-06-20 16:59:41 -0700571 ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
Kiran Patil3699d922011-04-18 16:24:14 -0700572}