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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 | |
40 | #include "tcm_fc.h" | |
41 | ||
42 | /* | |
43 | * Dump cmd state for debugging. | |
44 | */ | |
1fa8f450 | 45 | static void _ft_dump_cmd(struct ft_cmd *cmd, const char *caller) |
3699d92a KP |
46 | { |
47 | struct fc_exch *ep; | |
48 | struct fc_seq *sp; | |
49 | struct se_cmd *se_cmd; | |
ec98f782 AG |
50 | struct scatterlist *sg; |
51 | int count; | |
3699d92a | 52 | |
3699d92a | 53 | se_cmd = &cmd->se_cmd; |
58fc73d1 CH |
54 | pr_debug("%s: cmd %p sess %p seq %p se_cmd %p\n", |
55 | caller, cmd, cmd->sess, cmd->seq, se_cmd); | |
3699d92a | 56 | |
6708bb27 | 57 | pr_debug("%s: cmd %p data_nents %u len %u se_cmd_flags <0x%x>\n", |
ec98f782 | 58 | caller, cmd, se_cmd->t_data_nents, |
05d1c7c0 | 59 | se_cmd->data_length, se_cmd->se_cmd_flags); |
5951146d | 60 | |
ec98f782 | 61 | for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, count) |
6708bb27 | 62 | pr_debug("%s: cmd %p sg %p page %p " |
ec98f782 AG |
63 | "len 0x%x off 0x%x\n", |
64 | caller, cmd, sg, | |
65 | sg_page(sg), sg->length, sg->offset); | |
66 | ||
3699d92a KP |
67 | sp = cmd->seq; |
68 | if (sp) { | |
69 | ep = fc_seq_exch(sp); | |
6708bb27 | 70 | pr_debug("%s: cmd %p sid %x did %x " |
3699d92a KP |
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); | |
74 | } | |
3699d92a KP |
75 | } |
76 | ||
1fa8f450 MR |
77 | void ft_dump_cmd(struct ft_cmd *cmd, const char *caller) |
78 | { | |
79 | if (unlikely(ft_debug_logging)) | |
80 | _ft_dump_cmd(cmd, caller); | |
81 | } | |
82 | ||
3699d92a KP |
83 | static void ft_free_cmd(struct ft_cmd *cmd) |
84 | { | |
85 | struct fc_frame *fp; | |
ed8ec8f7 | 86 | struct ft_sess *sess; |
3699d92a KP |
87 | |
88 | if (!cmd) | |
89 | return; | |
ed8ec8f7 | 90 | sess = cmd->sess; |
3699d92a | 91 | fp = cmd->req_frame; |
3699d92a | 92 | if (fr_seq(fp)) |
9625cc48 | 93 | fc_seq_release(fr_seq(fp)); |
3699d92a | 94 | fc_frame_free(fp); |
ed8ec8f7 NB |
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 */ | |
3699d92a KP |
97 | } |
98 | ||
99 | void ft_release_cmd(struct se_cmd *se_cmd) | |
100 | { | |
101 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
102 | ||
103 | ft_free_cmd(cmd); | |
104 | } | |
105 | ||
88dd9e26 | 106 | int ft_check_stop_free(struct se_cmd *se_cmd) |
3699d92a | 107 | { |
91973cd6 | 108 | return transport_generic_free_cmd(se_cmd, 0); |
3699d92a KP |
109 | } |
110 | ||
111 | /* | |
112 | * Send response. | |
113 | */ | |
114 | int ft_queue_status(struct se_cmd *se_cmd) | |
115 | { | |
116 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
117 | struct fc_frame *fp; | |
118 | struct fcp_resp_with_ext *fcp; | |
119 | struct fc_lport *lport; | |
120 | struct fc_exch *ep; | |
121 | size_t len; | |
6dbe7f4e | 122 | int rc; |
3699d92a | 123 | |
e1c40382 MR |
124 | if (cmd->aborted) |
125 | return 0; | |
3699d92a KP |
126 | ft_dump_cmd(cmd, __func__); |
127 | ep = fc_seq_exch(cmd->seq); | |
128 | lport = ep->lp; | |
129 | len = sizeof(*fcp) + se_cmd->scsi_sense_length; | |
130 | fp = fc_frame_alloc(lport, len); | |
131 | if (!fp) { | |
6dbe7f4e NB |
132 | se_cmd->scsi_status = SAM_STAT_TASK_SET_FULL; |
133 | return -ENOMEM; | |
3699d92a | 134 | } |
6dbe7f4e | 135 | |
3699d92a KP |
136 | fcp = fc_frame_payload_get(fp, len); |
137 | memset(fcp, 0, len); | |
138 | fcp->resp.fr_status = se_cmd->scsi_status; | |
139 | ||
140 | len = se_cmd->scsi_sense_length; | |
141 | if (len) { | |
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); | |
145 | } | |
146 | ||
147 | /* | |
148 | * Test underflow and overflow with one mask. Usually both are off. | |
149 | * Bidirectional commands are not handled yet. | |
150 | */ | |
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; | |
154 | else | |
155 | fcp->resp.fr_flags |= FCP_RESID_UNDER; | |
156 | fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count); | |
157 | } | |
158 | ||
159 | /* | |
160 | * Send response. | |
161 | */ | |
c6865b30 | 162 | cmd->seq = fc_seq_start_next(cmd->seq); |
3699d92a KP |
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); | |
165 | ||
0cac937d | 166 | rc = fc_seq_send(lport, cmd->seq, fp); |
6dbe7f4e NB |
167 | if (rc) { |
168 | pr_info_ratelimited("%s: Failed to send response frame %p, " | |
169 | "xid <0x%x>\n", __func__, fp, ep->xid); | |
170 | /* | |
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. | |
174 | */ | |
175 | se_cmd->scsi_status = SAM_STAT_TASK_SET_FULL; | |
176 | return -ENOMEM; | |
177 | } | |
768c72cc | 178 | fc_exch_done(cmd->seq); |
91973cd6 NB |
179 | /* |
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. | |
183 | */ | |
184 | target_put_sess_cmd(&cmd->se_cmd); | |
3699d92a KP |
185 | return 0; |
186 | } | |
187 | ||
188 | int ft_write_pending_status(struct se_cmd *se_cmd) | |
189 | { | |
190 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
191 | ||
192 | return cmd->write_data_len != se_cmd->data_length; | |
193 | } | |
194 | ||
195 | /* | |
196 | * Send TX_RDY (transfer ready). | |
197 | */ | |
198 | int ft_write_pending(struct se_cmd *se_cmd) | |
199 | { | |
200 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); | |
201 | struct fc_frame *fp; | |
202 | struct fcp_txrdy *txrdy; | |
203 | struct fc_lport *lport; | |
204 | struct fc_exch *ep; | |
205 | struct fc_frame_header *fh; | |
206 | u32 f_ctl; | |
207 | ||
208 | ft_dump_cmd(cmd, __func__); | |
209 | ||
e1c40382 MR |
210 | if (cmd->aborted) |
211 | return 0; | |
3699d92a KP |
212 | ep = fc_seq_exch(cmd->seq); |
213 | lport = ep->lp; | |
214 | fp = fc_frame_alloc(lport, sizeof(*txrdy)); | |
215 | if (!fp) | |
03e98c9e | 216 | return -ENOMEM; /* Signal QUEUE_FULL */ |
3699d92a KP |
217 | |
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); | |
221 | ||
c6865b30 | 222 | cmd->seq = fc_seq_start_next(cmd->seq); |
3699d92a KP |
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); | |
225 | ||
226 | fh = fc_frame_header_get(fp); | |
227 | f_ctl = ntoh24(fh->fh_f_ctl); | |
228 | ||
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)' | |
233 | */ | |
234 | if ((ep->xid <= lport->lro_xid) && | |
235 | (fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) { | |
64f1db38 | 236 | if ((se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && |
e182d682 RD |
237 | lport->tt.ddp_target(lport, ep->xid, |
238 | se_cmd->t_data_sg, | |
239 | se_cmd->t_data_nents)) | |
3699d92a KP |
240 | cmd->was_ddp_setup = 1; |
241 | } | |
242 | } | |
0cac937d | 243 | fc_seq_send(lport, cmd->seq, fp); |
3699d92a KP |
244 | return 0; |
245 | } | |
246 | ||
3699d92a KP |
247 | int ft_get_cmd_state(struct se_cmd *se_cmd) |
248 | { | |
58fc73d1 | 249 | return 0; |
3699d92a KP |
250 | } |
251 | ||
3699d92a KP |
252 | /* |
253 | * FC sequence response handler for follow-on sequences (data) and aborts. | |
254 | */ | |
255 | static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg) | |
256 | { | |
257 | struct ft_cmd *cmd = arg; | |
258 | struct fc_frame_header *fh; | |
259 | ||
9d8c94e4 | 260 | if (IS_ERR(fp)) { |
3699d92a | 261 | /* XXX need to find cmd if queued */ |
3699d92a | 262 | cmd->seq = NULL; |
e1c40382 | 263 | cmd->aborted = true; |
3699d92a KP |
264 | return; |
265 | } | |
266 | ||
267 | fh = fc_frame_header_get(fp); | |
268 | ||
269 | switch (fh->fh_r_ctl) { | |
270 | case FC_RCTL_DD_SOL_DATA: /* write data */ | |
271 | ft_recv_write_data(cmd, fp); | |
272 | break; | |
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 */ | |
276 | default: | |
6708bb27 | 277 | pr_debug("%s: unhandled frame r_ctl %x\n", |
3699d92a | 278 | __func__, fh->fh_r_ctl); |
dcd998cc | 279 | ft_invl_hw_context(cmd); |
3699d92a | 280 | fc_frame_free(fp); |
82f1c8a4 | 281 | transport_generic_free_cmd(&cmd->se_cmd, 0); |
3699d92a KP |
282 | break; |
283 | } | |
284 | } | |
285 | ||
286 | /* | |
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. | |
290 | */ | |
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) | |
294 | { | |
295 | struct fc_frame *fp; | |
296 | struct fc_seq *sp; | |
297 | const struct fc_frame_header *fh; | |
298 | size_t len; | |
299 | struct fcp_resp_with_ext *fcp; | |
300 | struct fcp_resp_rsp_info *info; | |
301 | ||
302 | fh = fc_frame_header_get(rx_fp); | |
6708bb27 | 303 | pr_debug("FCP error response: did %x oxid %x status %x code %x\n", |
3699d92a KP |
304 | ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code); |
305 | len = sizeof(*fcp); | |
306 | if (status == SAM_STAT_GOOD) | |
307 | len += sizeof(*info); | |
308 | fp = fc_frame_alloc(lport, len); | |
309 | if (!fp) | |
310 | return; | |
311 | fcp = fc_frame_payload_get(fp, len); | |
312 | memset(fcp, 0, 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; | |
319 | } | |
320 | ||
321 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0); | |
322 | sp = fr_seq(fp); | |
031ed4d5 | 323 | if (sp) { |
0cac937d | 324 | fc_seq_send(lport, sp, fp); |
768c72cc | 325 | fc_exch_done(sp); |
031ed4d5 | 326 | } else { |
3699d92a | 327 | lport->tt.frame_send(lport, fp); |
031ed4d5 | 328 | } |
3699d92a KP |
329 | } |
330 | ||
331 | /* | |
332 | * Send error or task management response. | |
3699d92a | 333 | */ |
f2f7b09c KP |
334 | static void ft_send_resp_code(struct ft_cmd *cmd, |
335 | enum fcp_resp_rsp_codes code) | |
3699d92a KP |
336 | { |
337 | ft_send_resp_status(cmd->sess->tport->lport, | |
338 | cmd->req_frame, SAM_STAT_GOOD, code); | |
f2f7b09c KP |
339 | } |
340 | ||
341 | ||
342 | /* | |
343 | * Send error or task management response. | |
344 | * Always frees the cmd and associated state. | |
345 | */ | |
346 | static void ft_send_resp_code_and_free(struct ft_cmd *cmd, | |
347 | enum fcp_resp_rsp_codes code) | |
348 | { | |
349 | ft_send_resp_code(cmd, code); | |
3699d92a KP |
350 | ft_free_cmd(cmd); |
351 | } | |
352 | ||
353 | /* | |
354 | * Handle Task Management Request. | |
355 | */ | |
356 | static void ft_send_tm(struct ft_cmd *cmd) | |
357 | { | |
3699d92a | 358 | struct fcp_cmnd *fcp; |
00ad4c4e | 359 | int rc; |
3699d92a KP |
360 | u8 tm_func; |
361 | ||
362 | fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp)); | |
363 | ||
364 | switch (fcp->fc_tm_flags) { | |
365 | case FCP_TMF_LUN_RESET: | |
366 | tm_func = TMR_LUN_RESET; | |
3699d92a KP |
367 | break; |
368 | case FCP_TMF_TGT_RESET: | |
369 | tm_func = TMR_TARGET_WARM_RESET; | |
370 | break; | |
371 | case FCP_TMF_CLR_TASK_SET: | |
372 | tm_func = TMR_CLEAR_TASK_SET; | |
373 | break; | |
374 | case FCP_TMF_ABT_TASK_SET: | |
375 | tm_func = TMR_ABORT_TASK_SET; | |
376 | break; | |
377 | case FCP_TMF_CLR_ACA: | |
378 | tm_func = TMR_CLEAR_ACA; | |
379 | break; | |
380 | default: | |
381 | /* | |
382 | * FCP4r01 indicates having a combination of | |
383 | * tm_flags set is invalid. | |
384 | */ | |
6708bb27 | 385 | pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags); |
f2f7b09c | 386 | ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID); |
3699d92a KP |
387 | return; |
388 | } | |
389 | ||
c0974f89 | 390 | /* FIXME: Add referenced task tag for ABORT_TASK */ |
00ad4c4e | 391 | rc = target_submit_tmr(&cmd->se_cmd, cmd->sess->se_sess, |
59dcb5ec | 392 | &cmd->ft_sense_buffer[0], scsilun_to_int(&fcp->fc_lun), |
91973cd6 | 393 | cmd, tm_func, GFP_KERNEL, 0, TARGET_SCF_ACK_KREF); |
00ad4c4e NB |
394 | if (rc < 0) |
395 | ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED); | |
3699d92a KP |
396 | } |
397 | ||
398 | /* | |
399 | * Send status from completed task management request. | |
400 | */ | |
b79fafac | 401 | void ft_queue_tm_resp(struct se_cmd *se_cmd) |
3699d92a KP |
402 | { |
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; | |
406 | ||
e1c40382 | 407 | if (cmd->aborted) |
b79fafac | 408 | return; |
3699d92a KP |
409 | switch (tmr->response) { |
410 | case TMR_FUNCTION_COMPLETE: | |
411 | code = FCP_TMF_CMPL; | |
412 | break; | |
413 | case TMR_LUN_DOES_NOT_EXIST: | |
414 | code = FCP_TMF_INVALID_LUN; | |
415 | break; | |
416 | case TMR_FUNCTION_REJECTED: | |
417 | code = FCP_TMF_REJECTED; | |
418 | break; | |
419 | case TMR_TASK_DOES_NOT_EXIST: | |
3699d92a | 420 | case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: |
3699d92a KP |
421 | default: |
422 | code = FCP_TMF_FAILED; | |
423 | break; | |
424 | } | |
6708bb27 | 425 | pr_debug("tmr fn %d resp %d fcp code %d\n", |
3699d92a KP |
426 | tmr->function, tmr->response, code); |
427 | ft_send_resp_code(cmd, code); | |
91973cd6 NB |
428 | /* |
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. | |
432 | */ | |
433 | target_put_sess_cmd(&cmd->se_cmd); | |
3699d92a KP |
434 | } |
435 | ||
131e6abc NB |
436 | void ft_aborted_task(struct se_cmd *se_cmd) |
437 | { | |
438 | return; | |
439 | } | |
440 | ||
58fc73d1 CH |
441 | static void ft_send_work(struct work_struct *work); |
442 | ||
3699d92a KP |
443 | /* |
444 | * Handle incoming FCP command. | |
445 | */ | |
446 | static void ft_recv_cmd(struct ft_sess *sess, struct fc_frame *fp) | |
447 | { | |
448 | struct ft_cmd *cmd; | |
449 | struct fc_lport *lport = sess->tport->lport; | |
5f544cfa NB |
450 | struct se_session *se_sess = sess->se_sess; |
451 | int tag; | |
3699d92a | 452 | |
6f6b5d1e | 453 | tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING); |
5f544cfa | 454 | if (tag < 0) |
3699d92a | 455 | goto busy; |
5f544cfa NB |
456 | |
457 | cmd = &((struct ft_cmd *)se_sess->sess_cmd_map)[tag]; | |
458 | memset(cmd, 0, sizeof(struct ft_cmd)); | |
459 | ||
460 | cmd->se_cmd.map_tag = tag; | |
3699d92a | 461 | cmd->sess = sess; |
96d564e2 | 462 | cmd->seq = fc_seq_assign(lport, fp); |
3699d92a | 463 | if (!cmd->seq) { |
5f544cfa | 464 | percpu_ida_free(&se_sess->sess_tag_pool, tag); |
3699d92a KP |
465 | goto busy; |
466 | } | |
467 | cmd->req_frame = fp; /* hold frame during cmd */ | |
58fc73d1 CH |
468 | |
469 | INIT_WORK(&cmd->work, ft_send_work); | |
470 | queue_work(sess->tport->tpg->workqueue, &cmd->work); | |
3699d92a KP |
471 | return; |
472 | ||
473 | busy: | |
6708bb27 | 474 | pr_debug("cmd or seq allocation failure - sending BUSY\n"); |
3699d92a KP |
475 | ft_send_resp_status(lport, fp, SAM_STAT_BUSY, 0); |
476 | fc_frame_free(fp); | |
477 | ft_sess_put(sess); /* undo get from lookup */ | |
478 | } | |
479 | ||
480 | ||
481 | /* | |
482 | * Handle incoming FCP frame. | |
483 | * Caller has verified that the frame is type FCP. | |
484 | */ | |
485 | void ft_recv_req(struct ft_sess *sess, struct fc_frame *fp) | |
486 | { | |
487 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
488 | ||
489 | switch (fh->fh_r_ctl) { | |
490 | case FC_RCTL_DD_UNSOL_CMD: /* command */ | |
491 | ft_recv_cmd(sess, fp); | |
492 | break; | |
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 */ | |
498 | default: | |
6708bb27 | 499 | pr_debug("%s: unhandled frame r_ctl %x\n", |
3699d92a KP |
500 | __func__, fh->fh_r_ctl); |
501 | fc_frame_free(fp); | |
502 | ft_sess_put(sess); /* undo get from lookup */ | |
503 | break; | |
504 | } | |
505 | } | |
506 | ||
507 | /* | |
508 | * Send new command to target. | |
509 | */ | |
58fc73d1 | 510 | static void ft_send_work(struct work_struct *work) |
3699d92a | 511 | { |
58fc73d1 | 512 | struct ft_cmd *cmd = container_of(work, struct ft_cmd, work); |
3699d92a | 513 | struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame); |
3699d92a | 514 | struct fcp_cmnd *fcp; |
58fc73d1 | 515 | int data_dir = 0; |
3699d92a | 516 | int task_attr; |
3699d92a KP |
517 | |
518 | fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp)); | |
519 | if (!fcp) | |
520 | goto err; | |
521 | ||
522 | if (fcp->fc_flags & FCP_CFL_LEN_MASK) | |
523 | goto err; /* not handling longer CDBs yet */ | |
524 | ||
3699d92a KP |
525 | /* |
526 | * Check for FCP task management flags | |
527 | */ | |
528 | if (fcp->fc_tm_flags) { | |
529 | ft_send_tm(cmd); | |
530 | return; | |
531 | } | |
0dccb69d AG |
532 | |
533 | switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) { | |
534 | case 0: | |
535 | data_dir = DMA_NONE; | |
536 | break; | |
537 | case FCP_CFL_RDDATA: | |
538 | data_dir = DMA_FROM_DEVICE; | |
539 | break; | |
540 | case FCP_CFL_WRDATA: | |
541 | data_dir = DMA_TO_DEVICE; | |
542 | break; | |
543 | case FCP_CFL_WRDATA | FCP_CFL_RDDATA: | |
544 | goto err; /* TBD not supported by tcm_fc yet */ | |
545 | } | |
546 | /* | |
547 | * Locate the SAM Task Attr from fc_pri_ta | |
548 | */ | |
549 | switch (fcp->fc_pri_ta & FCP_PTA_MASK) { | |
550 | case FCP_PTA_HEADQ: | |
68d81f40 | 551 | task_attr = TCM_HEAD_TAG; |
0dccb69d AG |
552 | break; |
553 | case FCP_PTA_ORDERED: | |
68d81f40 | 554 | task_attr = TCM_ORDERED_TAG; |
0dccb69d AG |
555 | break; |
556 | case FCP_PTA_ACA: | |
68d81f40 | 557 | task_attr = TCM_ACA_TAG; |
0dccb69d AG |
558 | break; |
559 | case FCP_PTA_SIMPLE: /* Fallthrough */ | |
560 | default: | |
68d81f40 | 561 | task_attr = TCM_SIMPLE_TAG; |
0dccb69d AG |
562 | } |
563 | ||
f1d61e6e | 564 | fc_seq_set_resp(cmd->seq, ft_recv_seq, cmd); |
649ee054 | 565 | cmd->se_cmd.tag = fc_seq_exch(cmd->seq)->rxid; |
4355a911 NB |
566 | /* |
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. | |
569 | */ | |
d6dfc868 RD |
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), | |
91973cd6 | 572 | ntohl(fcp->fc_dl), task_attr, data_dir, |
1ba0158f | 573 | TARGET_SCF_ACK_KREF | TARGET_SCF_USE_CPUID)) |
d6dfc868 RD |
574 | goto err; |
575 | ||
b04bf583 | 576 | pr_debug("r_ctl %x target_submit_cmd %p\n", fh->fh_r_ctl, cmd); |
3699d92a KP |
577 | return; |
578 | ||
579 | err: | |
f2f7b09c | 580 | ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID); |
3699d92a | 581 | } |