2 * Copyright (c) 2010 Cisco Systems, Inc.
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.
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
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.
18 /* XXX TBD some includes may be extraneous */
20 #include <linux/module.h>
21 #include <linux/moduleparam.h>
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>
31 #include <linux/percpu_ida.h>
32 #include <asm/unaligned.h>
33 #include <scsi/scsi_tcq.h>
34 #include <scsi/libfc.h>
35 #include <scsi/fc_encode.h>
37 #include <target/target_core_base.h>
38 #include <target/target_core_fabric.h>
43 * Dump cmd state for debugging.
45 static void _ft_dump_cmd(struct ft_cmd *cmd, const char *caller)
49 struct se_cmd *se_cmd;
50 struct scatterlist *sg;
53 se_cmd = &cmd->se_cmd;
54 pr_debug("%s: cmd %p sess %p seq %p se_cmd %p\n",
55 caller, cmd, cmd->sess, cmd->seq, se_cmd);
57 pr_debug("%s: cmd %p data_nents %u len %u se_cmd_flags <0x%x>\n",
58 caller, cmd, se_cmd->t_data_nents,
59 se_cmd->data_length, se_cmd->se_cmd_flags);
61 for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, count)
62 pr_debug("%s: cmd %p sg %p page %p "
63 "len 0x%x off 0x%x\n",
65 sg_page(sg), sg->length, sg->offset);
70 pr_debug("%s: cmd %p sid %x did %x "
71 "ox_id %x rx_id %x seq_id %x e_stat %x\n",
72 caller, cmd, ep->sid, ep->did, ep->oxid, ep->rxid,
73 sp->id, ep->esb_stat);
77 void ft_dump_cmd(struct ft_cmd *cmd, const char *caller)
79 if (unlikely(ft_debug_logging))
80 _ft_dump_cmd(cmd, caller);
83 static void ft_free_cmd(struct ft_cmd *cmd)
93 fc_seq_release(fr_seq(fp));
95 percpu_ida_free(&sess->se_sess->sess_tag_pool, cmd->se_cmd.map_tag);
96 ft_sess_put(sess); /* undo get from lookup at recv */
99 void ft_release_cmd(struct se_cmd *se_cmd)
101 struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
106 int ft_check_stop_free(struct se_cmd *se_cmd)
108 return transport_generic_free_cmd(se_cmd, 0);
114 int ft_queue_status(struct se_cmd *se_cmd)
116 struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
118 struct fcp_resp_with_ext *fcp;
119 struct fc_lport *lport;
126 ft_dump_cmd(cmd, __func__);
127 ep = fc_seq_exch(cmd->seq);
129 len = sizeof(*fcp) + se_cmd->scsi_sense_length;
130 fp = fc_frame_alloc(lport, len);
132 se_cmd->scsi_status = SAM_STAT_TASK_SET_FULL;
136 fcp = fc_frame_payload_get(fp, len);
138 fcp->resp.fr_status = se_cmd->scsi_status;
140 len = se_cmd->scsi_sense_length;
142 fcp->resp.fr_flags |= FCP_SNS_LEN_VAL;
143 fcp->ext.fr_sns_len = htonl(len);
144 memcpy((fcp + 1), se_cmd->sense_buffer, len);
148 * Test underflow and overflow with one mask. Usually both are off.
149 * Bidirectional commands are not handled yet.
151 if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT)) {
152 if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT)
153 fcp->resp.fr_flags |= FCP_RESID_OVER;
155 fcp->resp.fr_flags |= FCP_RESID_UNDER;
156 fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count);
162 cmd->seq = fc_seq_start_next(cmd->seq);
163 fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP,
164 FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ, 0);
166 rc = fc_seq_send(lport, cmd->seq, fp);
168 pr_info_ratelimited("%s: Failed to send response frame %p, "
169 "xid <0x%x>\n", __func__, fp, ep->xid);
171 * Generate a TASK_SET_FULL status to notify the initiator
172 * to reduce it's queue_depth after the se_cmd response has
173 * been re-queued by target-core.
175 se_cmd->scsi_status = SAM_STAT_TASK_SET_FULL;
178 fc_exch_done(cmd->seq);
180 * Drop the extra ACK_KREF reference taken by target_submit_cmd()
181 * ahead of ft_check_stop_free() -> transport_generic_free_cmd()
182 * final se_cmd->cmd_kref put.
184 target_put_sess_cmd(&cmd->se_cmd);
188 int ft_write_pending_status(struct se_cmd *se_cmd)
190 struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
192 return cmd->write_data_len != se_cmd->data_length;
196 * Send TX_RDY (transfer ready).
198 int ft_write_pending(struct se_cmd *se_cmd)
200 struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
202 struct fcp_txrdy *txrdy;
203 struct fc_lport *lport;
205 struct fc_frame_header *fh;
208 ft_dump_cmd(cmd, __func__);
212 ep = fc_seq_exch(cmd->seq);
214 fp = fc_frame_alloc(lport, sizeof(*txrdy));
216 return -ENOMEM; /* Signal QUEUE_FULL */
218 txrdy = fc_frame_payload_get(fp, sizeof(*txrdy));
219 memset(txrdy, 0, sizeof(*txrdy));
220 txrdy->ft_burst_len = htonl(se_cmd->data_length);
222 cmd->seq = fc_seq_start_next(cmd->seq);
223 fc_fill_fc_hdr(fp, FC_RCTL_DD_DATA_DESC, ep->did, ep->sid, FC_TYPE_FCP,
224 FC_FC_EX_CTX | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
226 fh = fc_frame_header_get(fp);
227 f_ctl = ntoh24(fh->fh_f_ctl);
229 /* Only if it is 'Exchange Responder' */
230 if (f_ctl & FC_FC_EX_CTX) {
231 /* Target is 'exchange responder' and sending XFER_READY
232 * to 'exchange initiator (initiator)'
234 if ((ep->xid <= lport->lro_xid) &&
235 (fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) {
236 if ((se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
237 lport->tt.ddp_target(lport, ep->xid,
239 se_cmd->t_data_nents))
240 cmd->was_ddp_setup = 1;
243 fc_seq_send(lport, cmd->seq, fp);
247 int ft_get_cmd_state(struct se_cmd *se_cmd)
253 * FC sequence response handler for follow-on sequences (data) and aborts.
255 static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg)
257 struct ft_cmd *cmd = arg;
258 struct fc_frame_header *fh;
261 /* XXX need to find cmd if queued */
267 fh = fc_frame_header_get(fp);
269 switch (fh->fh_r_ctl) {
270 case FC_RCTL_DD_SOL_DATA: /* write data */
271 ft_recv_write_data(cmd, fp);
273 case FC_RCTL_DD_UNSOL_CTL: /* command */
274 case FC_RCTL_DD_SOL_CTL: /* transfer ready */
275 case FC_RCTL_DD_DATA_DESC: /* transfer ready */
277 pr_debug("%s: unhandled frame r_ctl %x\n",
278 __func__, fh->fh_r_ctl);
279 ft_invl_hw_context(cmd);
281 transport_generic_free_cmd(&cmd->se_cmd, 0);
287 * Send a FCP response including SCSI status and optional FCP rsp_code.
288 * status is SAM_STAT_GOOD (zero) iff code is valid.
289 * This is used in error cases, such as allocation failures.
291 static void ft_send_resp_status(struct fc_lport *lport,
292 const struct fc_frame *rx_fp,
293 u32 status, enum fcp_resp_rsp_codes code)
297 const struct fc_frame_header *fh;
299 struct fcp_resp_with_ext *fcp;
300 struct fcp_resp_rsp_info *info;
302 fh = fc_frame_header_get(rx_fp);
303 pr_debug("FCP error response: did %x oxid %x status %x code %x\n",
304 ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code);
306 if (status == SAM_STAT_GOOD)
307 len += sizeof(*info);
308 fp = fc_frame_alloc(lport, len);
311 fcp = fc_frame_payload_get(fp, len);
313 fcp->resp.fr_status = status;
314 if (status == SAM_STAT_GOOD) {
315 fcp->ext.fr_rsp_len = htonl(sizeof(*info));
316 fcp->resp.fr_flags |= FCP_RSP_LEN_VAL;
317 info = (struct fcp_resp_rsp_info *)(fcp + 1);
318 info->rsp_code = code;
321 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0);
324 fc_seq_send(lport, sp, fp);
327 lport->tt.frame_send(lport, fp);
332 * Send error or task management response.
334 static void ft_send_resp_code(struct ft_cmd *cmd,
335 enum fcp_resp_rsp_codes code)
337 ft_send_resp_status(cmd->sess->tport->lport,
338 cmd->req_frame, SAM_STAT_GOOD, code);
343 * Send error or task management response.
344 * Always frees the cmd and associated state.
346 static void ft_send_resp_code_and_free(struct ft_cmd *cmd,
347 enum fcp_resp_rsp_codes code)
349 ft_send_resp_code(cmd, code);
354 * Handle Task Management Request.
356 static void ft_send_tm(struct ft_cmd *cmd)
358 struct fcp_cmnd *fcp;
362 fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
364 switch (fcp->fc_tm_flags) {
365 case FCP_TMF_LUN_RESET:
366 tm_func = TMR_LUN_RESET;
368 case FCP_TMF_TGT_RESET:
369 tm_func = TMR_TARGET_WARM_RESET;
371 case FCP_TMF_CLR_TASK_SET:
372 tm_func = TMR_CLEAR_TASK_SET;
374 case FCP_TMF_ABT_TASK_SET:
375 tm_func = TMR_ABORT_TASK_SET;
377 case FCP_TMF_CLR_ACA:
378 tm_func = TMR_CLEAR_ACA;
382 * FCP4r01 indicates having a combination of
383 * tm_flags set is invalid.
385 pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags);
386 ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
390 /* FIXME: Add referenced task tag for ABORT_TASK */
391 rc = target_submit_tmr(&cmd->se_cmd, cmd->sess->se_sess,
392 &cmd->ft_sense_buffer[0], scsilun_to_int(&fcp->fc_lun),
393 cmd, tm_func, GFP_KERNEL, 0, TARGET_SCF_ACK_KREF);
395 ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED);
399 * Send status from completed task management request.
401 void ft_queue_tm_resp(struct se_cmd *se_cmd)
403 struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
404 struct se_tmr_req *tmr = se_cmd->se_tmr_req;
405 enum fcp_resp_rsp_codes code;
409 switch (tmr->response) {
410 case TMR_FUNCTION_COMPLETE:
413 case TMR_LUN_DOES_NOT_EXIST:
414 code = FCP_TMF_INVALID_LUN;
416 case TMR_FUNCTION_REJECTED:
417 code = FCP_TMF_REJECTED;
419 case TMR_TASK_DOES_NOT_EXIST:
420 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
422 code = FCP_TMF_FAILED;
425 pr_debug("tmr fn %d resp %d fcp code %d\n",
426 tmr->function, tmr->response, code);
427 ft_send_resp_code(cmd, code);
429 * Drop the extra ACK_KREF reference taken by target_submit_tmr()
430 * ahead of ft_check_stop_free() -> transport_generic_free_cmd()
431 * final se_cmd->cmd_kref put.
433 target_put_sess_cmd(&cmd->se_cmd);
436 void ft_aborted_task(struct se_cmd *se_cmd)
441 static void ft_send_work(struct work_struct *work);
444 * Handle incoming FCP command.
446 static void ft_recv_cmd(struct ft_sess *sess, struct fc_frame *fp)
449 struct fc_lport *lport = sess->tport->lport;
450 struct se_session *se_sess = sess->se_sess;
453 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING);
457 cmd = &((struct ft_cmd *)se_sess->sess_cmd_map)[tag];
458 memset(cmd, 0, sizeof(struct ft_cmd));
460 cmd->se_cmd.map_tag = tag;
462 cmd->seq = fc_seq_assign(lport, fp);
464 percpu_ida_free(&se_sess->sess_tag_pool, tag);
467 cmd->req_frame = fp; /* hold frame during cmd */
469 INIT_WORK(&cmd->work, ft_send_work);
470 queue_work(sess->tport->tpg->workqueue, &cmd->work);
474 pr_debug("cmd or seq allocation failure - sending BUSY\n");
475 ft_send_resp_status(lport, fp, SAM_STAT_BUSY, 0);
477 ft_sess_put(sess); /* undo get from lookup */
482 * Handle incoming FCP frame.
483 * Caller has verified that the frame is type FCP.
485 void ft_recv_req(struct ft_sess *sess, struct fc_frame *fp)
487 struct fc_frame_header *fh = fc_frame_header_get(fp);
489 switch (fh->fh_r_ctl) {
490 case FC_RCTL_DD_UNSOL_CMD: /* command */
491 ft_recv_cmd(sess, fp);
493 case FC_RCTL_DD_SOL_DATA: /* write data */
494 case FC_RCTL_DD_UNSOL_CTL:
495 case FC_RCTL_DD_SOL_CTL:
496 case FC_RCTL_DD_DATA_DESC: /* transfer ready */
497 case FC_RCTL_ELS4_REQ: /* SRR, perhaps */
499 pr_debug("%s: unhandled frame r_ctl %x\n",
500 __func__, fh->fh_r_ctl);
502 ft_sess_put(sess); /* undo get from lookup */
508 * Send new command to target.
510 static void ft_send_work(struct work_struct *work)
512 struct ft_cmd *cmd = container_of(work, struct ft_cmd, work);
513 struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame);
514 struct fcp_cmnd *fcp;
518 fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
522 if (fcp->fc_flags & FCP_CFL_LEN_MASK)
523 goto err; /* not handling longer CDBs yet */
526 * Check for FCP task management flags
528 if (fcp->fc_tm_flags) {
533 switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) {
538 data_dir = DMA_FROM_DEVICE;
541 data_dir = DMA_TO_DEVICE;
543 case FCP_CFL_WRDATA | FCP_CFL_RDDATA:
544 goto err; /* TBD not supported by tcm_fc yet */
547 * Locate the SAM Task Attr from fc_pri_ta
549 switch (fcp->fc_pri_ta & FCP_PTA_MASK) {
551 task_attr = TCM_HEAD_TAG;
553 case FCP_PTA_ORDERED:
554 task_attr = TCM_ORDERED_TAG;
557 task_attr = TCM_ACA_TAG;
559 case FCP_PTA_SIMPLE: /* Fallthrough */
561 task_attr = TCM_SIMPLE_TAG;
564 fc_seq_set_resp(cmd->seq, ft_recv_seq, cmd);
565 cmd->se_cmd.tag = fc_seq_exch(cmd->seq)->rxid;
567 * Use a single se_cmd->cmd_kref as we expect to release se_cmd
568 * directly from ft_check_stop_free callback in response path.
570 if (target_submit_cmd(&cmd->se_cmd, cmd->sess->se_sess, fcp->fc_cdb,
571 &cmd->ft_sense_buffer[0], scsilun_to_int(&fcp->fc_lun),
572 ntohl(fcp->fc_dl), task_attr, data_dir,
573 TARGET_SCF_ACK_KREF | TARGET_SCF_USE_CPUID))
576 pr_debug("r_ctl %x target_submit_cmd %p\n", fh->fh_r_ctl, cmd);
580 ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);