Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 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> |
| 22 | #include <linux/version.h> |
| 23 | #include <generated/utsrelease.h> |
| 24 | #include <linux/utsname.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/kthread.h> |
| 28 | #include <linux/types.h> |
| 29 | #include <linux/string.h> |
| 30 | #include <linux/configfs.h> |
| 31 | #include <linux/ctype.h> |
| 32 | #include <linux/hash.h> |
| 33 | #include <asm/unaligned.h> |
| 34 | #include <scsi/scsi.h> |
| 35 | #include <scsi/scsi_host.h> |
| 36 | #include <scsi/scsi_device.h> |
| 37 | #include <scsi/scsi_cmnd.h> |
Nicholas Bellinger | 61db180 | 2011-05-19 20:19:14 -0700 | [diff] [blame] | 38 | #include <scsi/scsi_tcq.h> |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 39 | #include <scsi/libfc.h> |
| 40 | #include <scsi/fc_encode.h> |
| 41 | |
| 42 | #include <target/target_core_base.h> |
| 43 | #include <target/target_core_transport.h> |
| 44 | #include <target/target_core_fabric_ops.h> |
| 45 | #include <target/target_core_device.h> |
| 46 | #include <target/target_core_tpg.h> |
| 47 | #include <target/target_core_configfs.h> |
| 48 | #include <target/target_core_base.h> |
| 49 | #include <target/target_core_tmr.h> |
| 50 | #include <target/configfs_macros.h> |
| 51 | |
| 52 | #include "tcm_fc.h" |
| 53 | |
| 54 | /* |
| 55 | * Dump cmd state for debugging. |
| 56 | */ |
| 57 | void ft_dump_cmd(struct ft_cmd *cmd, const char *caller) |
| 58 | { |
| 59 | struct fc_exch *ep; |
| 60 | struct fc_seq *sp; |
| 61 | struct se_cmd *se_cmd; |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 62 | struct scatterlist *sg; |
| 63 | int count; |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 64 | |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 65 | se_cmd = &cmd->se_cmd; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 66 | pr_debug("%s: cmd %p state %d sess %p seq %p se_cmd %p\n", |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 67 | caller, cmd, cmd->state, cmd->sess, cmd->seq, se_cmd); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 68 | pr_debug("%s: cmd %p cdb %p\n", |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 69 | caller, cmd, cmd->cdb); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 70 | pr_debug("%s: cmd %p lun %d\n", caller, cmd, cmd->lun); |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 71 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 72 | pr_debug("%s: cmd %p data_nents %u len %u se_cmd_flags <0x%x>\n", |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 73 | caller, cmd, se_cmd->t_data_nents, |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 74 | se_cmd->data_length, se_cmd->se_cmd_flags); |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 75 | |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 76 | for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, count) |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 77 | pr_debug("%s: cmd %p sg %p page %p " |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 78 | "len 0x%x off 0x%x\n", |
| 79 | caller, cmd, sg, |
| 80 | sg_page(sg), sg->length, sg->offset); |
| 81 | |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 82 | sp = cmd->seq; |
| 83 | if (sp) { |
| 84 | ep = fc_seq_exch(sp); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 85 | pr_debug("%s: cmd %p sid %x did %x " |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 86 | "ox_id %x rx_id %x seq_id %x e_stat %x\n", |
| 87 | caller, cmd, ep->sid, ep->did, ep->oxid, ep->rxid, |
| 88 | sp->id, ep->esb_stat); |
| 89 | } |
| 90 | print_hex_dump(KERN_INFO, "ft_dump_cmd ", DUMP_PREFIX_NONE, |
| 91 | 16, 4, cmd->cdb, MAX_COMMAND_SIZE, 0); |
| 92 | } |
| 93 | |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 94 | static void ft_queue_cmd(struct ft_sess *sess, struct ft_cmd *cmd) |
| 95 | { |
Nicholas Bellinger | 2be1814 | 2011-05-27 13:58:48 -0700 | [diff] [blame] | 96 | struct ft_tpg *tpg = sess->tport->tpg; |
| 97 | struct se_queue_obj *qobj = &tpg->qobj; |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 98 | unsigned long flags; |
| 99 | |
| 100 | qobj = &sess->tport->tpg->qobj; |
| 101 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); |
| 102 | list_add_tail(&cmd->se_req.qr_list, &qobj->qobj_list); |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 103 | atomic_inc(&qobj->queue_cnt); |
Nicholas Bellinger | 2be1814 | 2011-05-27 13:58:48 -0700 | [diff] [blame] | 104 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
| 105 | |
| 106 | wake_up_process(tpg->thread); |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | static struct ft_cmd *ft_dequeue_cmd(struct se_queue_obj *qobj) |
| 110 | { |
| 111 | unsigned long flags; |
| 112 | struct se_queue_req *qr; |
| 113 | |
| 114 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); |
| 115 | if (list_empty(&qobj->qobj_list)) { |
| 116 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
| 117 | return NULL; |
| 118 | } |
| 119 | qr = list_first_entry(&qobj->qobj_list, struct se_queue_req, qr_list); |
| 120 | list_del(&qr->qr_list); |
| 121 | atomic_dec(&qobj->queue_cnt); |
| 122 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
| 123 | return container_of(qr, struct ft_cmd, se_req); |
| 124 | } |
| 125 | |
| 126 | static void ft_free_cmd(struct ft_cmd *cmd) |
| 127 | { |
| 128 | struct fc_frame *fp; |
| 129 | struct fc_lport *lport; |
| 130 | |
| 131 | if (!cmd) |
| 132 | return; |
| 133 | fp = cmd->req_frame; |
| 134 | lport = fr_dev(fp); |
| 135 | if (fr_seq(fp)) |
| 136 | lport->tt.seq_release(fr_seq(fp)); |
| 137 | fc_frame_free(fp); |
| 138 | ft_sess_put(cmd->sess); /* undo get from lookup at recv */ |
| 139 | kfree(cmd); |
| 140 | } |
| 141 | |
| 142 | void ft_release_cmd(struct se_cmd *se_cmd) |
| 143 | { |
| 144 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); |
| 145 | |
| 146 | ft_free_cmd(cmd); |
| 147 | } |
| 148 | |
| 149 | void ft_check_stop_free(struct se_cmd *se_cmd) |
| 150 | { |
Christoph Hellwig | 3546297 | 2011-05-31 23:56:57 -0400 | [diff] [blame] | 151 | transport_generic_free_cmd(se_cmd, 0, 0); |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | /* |
| 155 | * Send response. |
| 156 | */ |
| 157 | int ft_queue_status(struct se_cmd *se_cmd) |
| 158 | { |
| 159 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); |
| 160 | struct fc_frame *fp; |
| 161 | struct fcp_resp_with_ext *fcp; |
| 162 | struct fc_lport *lport; |
| 163 | struct fc_exch *ep; |
| 164 | size_t len; |
| 165 | |
| 166 | ft_dump_cmd(cmd, __func__); |
| 167 | ep = fc_seq_exch(cmd->seq); |
| 168 | lport = ep->lp; |
| 169 | len = sizeof(*fcp) + se_cmd->scsi_sense_length; |
| 170 | fp = fc_frame_alloc(lport, len); |
| 171 | if (!fp) { |
| 172 | /* XXX shouldn't just drop it - requeue and retry? */ |
| 173 | return 0; |
| 174 | } |
| 175 | fcp = fc_frame_payload_get(fp, len); |
| 176 | memset(fcp, 0, len); |
| 177 | fcp->resp.fr_status = se_cmd->scsi_status; |
| 178 | |
| 179 | len = se_cmd->scsi_sense_length; |
| 180 | if (len) { |
| 181 | fcp->resp.fr_flags |= FCP_SNS_LEN_VAL; |
| 182 | fcp->ext.fr_sns_len = htonl(len); |
| 183 | memcpy((fcp + 1), se_cmd->sense_buffer, len); |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * Test underflow and overflow with one mask. Usually both are off. |
| 188 | * Bidirectional commands are not handled yet. |
| 189 | */ |
| 190 | if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT)) { |
| 191 | if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) |
| 192 | fcp->resp.fr_flags |= FCP_RESID_OVER; |
| 193 | else |
| 194 | fcp->resp.fr_flags |= FCP_RESID_UNDER; |
| 195 | fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count); |
| 196 | } |
| 197 | |
| 198 | /* |
| 199 | * Send response. |
| 200 | */ |
| 201 | cmd->seq = lport->tt.seq_start_next(cmd->seq); |
| 202 | fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP, |
| 203 | FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ, 0); |
| 204 | |
| 205 | lport->tt.seq_send(lport, cmd->seq, fp); |
| 206 | lport->tt.exch_done(cmd->seq); |
| 207 | return 0; |
| 208 | } |
| 209 | |
| 210 | int ft_write_pending_status(struct se_cmd *se_cmd) |
| 211 | { |
| 212 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); |
| 213 | |
| 214 | return cmd->write_data_len != se_cmd->data_length; |
| 215 | } |
| 216 | |
| 217 | /* |
| 218 | * Send TX_RDY (transfer ready). |
| 219 | */ |
| 220 | int ft_write_pending(struct se_cmd *se_cmd) |
| 221 | { |
| 222 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); |
| 223 | struct fc_frame *fp; |
| 224 | struct fcp_txrdy *txrdy; |
| 225 | struct fc_lport *lport; |
| 226 | struct fc_exch *ep; |
| 227 | struct fc_frame_header *fh; |
| 228 | u32 f_ctl; |
| 229 | |
| 230 | ft_dump_cmd(cmd, __func__); |
| 231 | |
| 232 | ep = fc_seq_exch(cmd->seq); |
| 233 | lport = ep->lp; |
| 234 | fp = fc_frame_alloc(lport, sizeof(*txrdy)); |
| 235 | if (!fp) |
| 236 | return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; |
| 237 | |
| 238 | txrdy = fc_frame_payload_get(fp, sizeof(*txrdy)); |
| 239 | memset(txrdy, 0, sizeof(*txrdy)); |
| 240 | txrdy->ft_burst_len = htonl(se_cmd->data_length); |
| 241 | |
| 242 | cmd->seq = lport->tt.seq_start_next(cmd->seq); |
| 243 | fc_fill_fc_hdr(fp, FC_RCTL_DD_DATA_DESC, ep->did, ep->sid, FC_TYPE_FCP, |
| 244 | FC_FC_EX_CTX | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
| 245 | |
| 246 | fh = fc_frame_header_get(fp); |
| 247 | f_ctl = ntoh24(fh->fh_f_ctl); |
| 248 | |
| 249 | /* Only if it is 'Exchange Responder' */ |
| 250 | if (f_ctl & FC_FC_EX_CTX) { |
| 251 | /* Target is 'exchange responder' and sending XFER_READY |
| 252 | * to 'exchange initiator (initiator)' |
| 253 | */ |
| 254 | if ((ep->xid <= lport->lro_xid) && |
| 255 | (fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) { |
| 256 | if (se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) { |
| 257 | /* |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 258 | * cmd may have been broken up into multiple |
| 259 | * tasks. Link their sgs together so we can |
| 260 | * operate on them all at once. |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 261 | */ |
| 262 | transport_do_task_sg_chain(se_cmd); |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 263 | cmd->sg = se_cmd->t_tasks_sg_chained; |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 264 | cmd->sg_cnt = |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 265 | se_cmd->t_tasks_sg_chained_no; |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 266 | } |
| 267 | if (cmd->sg && lport->tt.ddp_setup(lport, ep->xid, |
| 268 | cmd->sg, cmd->sg_cnt)) |
| 269 | cmd->was_ddp_setup = 1; |
| 270 | } |
| 271 | } |
| 272 | lport->tt.seq_send(lport, cmd->seq, fp); |
| 273 | return 0; |
| 274 | } |
| 275 | |
| 276 | u32 ft_get_task_tag(struct se_cmd *se_cmd) |
| 277 | { |
| 278 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); |
| 279 | |
| 280 | return fc_seq_exch(cmd->seq)->rxid; |
| 281 | } |
| 282 | |
| 283 | int ft_get_cmd_state(struct se_cmd *se_cmd) |
| 284 | { |
| 285 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); |
| 286 | |
| 287 | return cmd->state; |
| 288 | } |
| 289 | |
| 290 | int ft_is_state_remove(struct se_cmd *se_cmd) |
| 291 | { |
| 292 | return 0; /* XXX TBD */ |
| 293 | } |
| 294 | |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 295 | /* |
| 296 | * FC sequence response handler for follow-on sequences (data) and aborts. |
| 297 | */ |
| 298 | static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg) |
| 299 | { |
| 300 | struct ft_cmd *cmd = arg; |
| 301 | struct fc_frame_header *fh; |
| 302 | |
| 303 | if (IS_ERR(fp)) { |
| 304 | /* XXX need to find cmd if queued */ |
| 305 | cmd->se_cmd.t_state = TRANSPORT_REMOVE; |
| 306 | cmd->seq = NULL; |
Christoph Hellwig | 3546297 | 2011-05-31 23:56:57 -0400 | [diff] [blame] | 307 | transport_generic_free_cmd(&cmd->se_cmd, 0, 0); |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 308 | return; |
| 309 | } |
| 310 | |
| 311 | fh = fc_frame_header_get(fp); |
| 312 | |
| 313 | switch (fh->fh_r_ctl) { |
| 314 | case FC_RCTL_DD_SOL_DATA: /* write data */ |
| 315 | ft_recv_write_data(cmd, fp); |
| 316 | break; |
| 317 | case FC_RCTL_DD_UNSOL_CTL: /* command */ |
| 318 | case FC_RCTL_DD_SOL_CTL: /* transfer ready */ |
| 319 | case FC_RCTL_DD_DATA_DESC: /* transfer ready */ |
| 320 | default: |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 321 | pr_debug("%s: unhandled frame r_ctl %x\n", |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 322 | __func__, fh->fh_r_ctl); |
| 323 | fc_frame_free(fp); |
Christoph Hellwig | 3546297 | 2011-05-31 23:56:57 -0400 | [diff] [blame] | 324 | transport_generic_free_cmd(&cmd->se_cmd, 0, 0); |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 325 | break; |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | /* |
| 330 | * Send a FCP response including SCSI status and optional FCP rsp_code. |
| 331 | * status is SAM_STAT_GOOD (zero) iff code is valid. |
| 332 | * This is used in error cases, such as allocation failures. |
| 333 | */ |
| 334 | static void ft_send_resp_status(struct fc_lport *lport, |
| 335 | const struct fc_frame *rx_fp, |
| 336 | u32 status, enum fcp_resp_rsp_codes code) |
| 337 | { |
| 338 | struct fc_frame *fp; |
| 339 | struct fc_seq *sp; |
| 340 | const struct fc_frame_header *fh; |
| 341 | size_t len; |
| 342 | struct fcp_resp_with_ext *fcp; |
| 343 | struct fcp_resp_rsp_info *info; |
| 344 | |
| 345 | fh = fc_frame_header_get(rx_fp); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 346 | pr_debug("FCP error response: did %x oxid %x status %x code %x\n", |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 347 | ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code); |
| 348 | len = sizeof(*fcp); |
| 349 | if (status == SAM_STAT_GOOD) |
| 350 | len += sizeof(*info); |
| 351 | fp = fc_frame_alloc(lport, len); |
| 352 | if (!fp) |
| 353 | return; |
| 354 | fcp = fc_frame_payload_get(fp, len); |
| 355 | memset(fcp, 0, len); |
| 356 | fcp->resp.fr_status = status; |
| 357 | if (status == SAM_STAT_GOOD) { |
| 358 | fcp->ext.fr_rsp_len = htonl(sizeof(*info)); |
| 359 | fcp->resp.fr_flags |= FCP_RSP_LEN_VAL; |
| 360 | info = (struct fcp_resp_rsp_info *)(fcp + 1); |
| 361 | info->rsp_code = code; |
| 362 | } |
| 363 | |
| 364 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0); |
| 365 | sp = fr_seq(fp); |
| 366 | if (sp) |
| 367 | lport->tt.seq_send(lport, sp, fp); |
| 368 | else |
| 369 | lport->tt.frame_send(lport, fp); |
| 370 | } |
| 371 | |
| 372 | /* |
| 373 | * Send error or task management response. |
| 374 | * Always frees the cmd and associated state. |
| 375 | */ |
| 376 | static void ft_send_resp_code(struct ft_cmd *cmd, enum fcp_resp_rsp_codes code) |
| 377 | { |
| 378 | ft_send_resp_status(cmd->sess->tport->lport, |
| 379 | cmd->req_frame, SAM_STAT_GOOD, code); |
| 380 | ft_free_cmd(cmd); |
| 381 | } |
| 382 | |
| 383 | /* |
| 384 | * Handle Task Management Request. |
| 385 | */ |
| 386 | static void ft_send_tm(struct ft_cmd *cmd) |
| 387 | { |
| 388 | struct se_tmr_req *tmr; |
| 389 | struct fcp_cmnd *fcp; |
Kiran Patil | 61db952 | 2011-06-22 16:30:22 -0700 | [diff] [blame] | 390 | struct ft_sess *sess; |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 391 | u8 tm_func; |
| 392 | |
| 393 | fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp)); |
| 394 | |
| 395 | switch (fcp->fc_tm_flags) { |
| 396 | case FCP_TMF_LUN_RESET: |
| 397 | tm_func = TMR_LUN_RESET; |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 398 | break; |
| 399 | case FCP_TMF_TGT_RESET: |
| 400 | tm_func = TMR_TARGET_WARM_RESET; |
| 401 | break; |
| 402 | case FCP_TMF_CLR_TASK_SET: |
| 403 | tm_func = TMR_CLEAR_TASK_SET; |
| 404 | break; |
| 405 | case FCP_TMF_ABT_TASK_SET: |
| 406 | tm_func = TMR_ABORT_TASK_SET; |
| 407 | break; |
| 408 | case FCP_TMF_CLR_ACA: |
| 409 | tm_func = TMR_CLEAR_ACA; |
| 410 | break; |
| 411 | default: |
| 412 | /* |
| 413 | * FCP4r01 indicates having a combination of |
| 414 | * tm_flags set is invalid. |
| 415 | */ |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 416 | pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags); |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 417 | ft_send_resp_code(cmd, FCP_CMND_FIELDS_INVALID); |
| 418 | return; |
| 419 | } |
| 420 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 421 | pr_debug("alloc tm cmd fn %d\n", tm_func); |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 422 | tmr = core_tmr_alloc_req(&cmd->se_cmd, cmd, tm_func); |
| 423 | if (!tmr) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 424 | pr_debug("alloc failed\n"); |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 425 | ft_send_resp_code(cmd, FCP_TMF_FAILED); |
| 426 | return; |
| 427 | } |
| 428 | cmd->se_cmd.se_tmr_req = tmr; |
Kiran Patil | 61db952 | 2011-06-22 16:30:22 -0700 | [diff] [blame] | 429 | |
| 430 | switch (fcp->fc_tm_flags) { |
| 431 | case FCP_TMF_LUN_RESET: |
| 432 | cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun); |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 433 | if (transport_lookup_tmr_lun(&cmd->se_cmd, cmd->lun) < 0) { |
Kiran Patil | 61db952 | 2011-06-22 16:30:22 -0700 | [diff] [blame] | 434 | /* |
| 435 | * Make sure to clean up newly allocated TMR request |
| 436 | * since "unable to handle TMR request because failed |
| 437 | * to get to LUN" |
| 438 | */ |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 439 | pr_debug("Failed to get LUN for TMR func %d, " |
Kiran Patil | 61db952 | 2011-06-22 16:30:22 -0700 | [diff] [blame] | 440 | "se_cmd %p, unpacked_lun %d\n", |
| 441 | tm_func, &cmd->se_cmd, cmd->lun); |
| 442 | ft_dump_cmd(cmd, __func__); |
| 443 | sess = cmd->sess; |
| 444 | transport_send_check_condition_and_sense(&cmd->se_cmd, |
| 445 | cmd->se_cmd.scsi_sense_reason, 0); |
Christoph Hellwig | 3546297 | 2011-05-31 23:56:57 -0400 | [diff] [blame] | 446 | transport_generic_free_cmd(&cmd->se_cmd, 0, 0); |
Kiran Patil | 61db952 | 2011-06-22 16:30:22 -0700 | [diff] [blame] | 447 | ft_sess_put(sess); |
| 448 | return; |
| 449 | } |
| 450 | break; |
| 451 | case FCP_TMF_TGT_RESET: |
| 452 | case FCP_TMF_CLR_TASK_SET: |
| 453 | case FCP_TMF_ABT_TASK_SET: |
| 454 | case FCP_TMF_CLR_ACA: |
| 455 | break; |
| 456 | default: |
| 457 | return; |
| 458 | } |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 459 | transport_generic_handle_tmr(&cmd->se_cmd); |
| 460 | } |
| 461 | |
| 462 | /* |
| 463 | * Send status from completed task management request. |
| 464 | */ |
| 465 | int ft_queue_tm_resp(struct se_cmd *se_cmd) |
| 466 | { |
| 467 | struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); |
| 468 | struct se_tmr_req *tmr = se_cmd->se_tmr_req; |
| 469 | enum fcp_resp_rsp_codes code; |
| 470 | |
| 471 | switch (tmr->response) { |
| 472 | case TMR_FUNCTION_COMPLETE: |
| 473 | code = FCP_TMF_CMPL; |
| 474 | break; |
| 475 | case TMR_LUN_DOES_NOT_EXIST: |
| 476 | code = FCP_TMF_INVALID_LUN; |
| 477 | break; |
| 478 | case TMR_FUNCTION_REJECTED: |
| 479 | code = FCP_TMF_REJECTED; |
| 480 | break; |
| 481 | case TMR_TASK_DOES_NOT_EXIST: |
| 482 | case TMR_TASK_STILL_ALLEGIANT: |
| 483 | case TMR_TASK_FAILOVER_NOT_SUPPORTED: |
| 484 | case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: |
| 485 | case TMR_FUNCTION_AUTHORIZATION_FAILED: |
| 486 | default: |
| 487 | code = FCP_TMF_FAILED; |
| 488 | break; |
| 489 | } |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 490 | pr_debug("tmr fn %d resp %d fcp code %d\n", |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 491 | tmr->function, tmr->response, code); |
| 492 | ft_send_resp_code(cmd, code); |
| 493 | return 0; |
| 494 | } |
| 495 | |
| 496 | /* |
| 497 | * Handle incoming FCP command. |
| 498 | */ |
| 499 | static void ft_recv_cmd(struct ft_sess *sess, struct fc_frame *fp) |
| 500 | { |
| 501 | struct ft_cmd *cmd; |
| 502 | struct fc_lport *lport = sess->tport->lport; |
| 503 | |
| 504 | cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC); |
| 505 | if (!cmd) |
| 506 | goto busy; |
| 507 | cmd->sess = sess; |
| 508 | cmd->seq = lport->tt.seq_assign(lport, fp); |
| 509 | if (!cmd->seq) { |
| 510 | kfree(cmd); |
| 511 | goto busy; |
| 512 | } |
| 513 | cmd->req_frame = fp; /* hold frame during cmd */ |
| 514 | ft_queue_cmd(sess, cmd); |
| 515 | return; |
| 516 | |
| 517 | busy: |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 518 | pr_debug("cmd or seq allocation failure - sending BUSY\n"); |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 519 | ft_send_resp_status(lport, fp, SAM_STAT_BUSY, 0); |
| 520 | fc_frame_free(fp); |
| 521 | ft_sess_put(sess); /* undo get from lookup */ |
| 522 | } |
| 523 | |
| 524 | |
| 525 | /* |
| 526 | * Handle incoming FCP frame. |
| 527 | * Caller has verified that the frame is type FCP. |
| 528 | */ |
| 529 | void ft_recv_req(struct ft_sess *sess, struct fc_frame *fp) |
| 530 | { |
| 531 | struct fc_frame_header *fh = fc_frame_header_get(fp); |
| 532 | |
| 533 | switch (fh->fh_r_ctl) { |
| 534 | case FC_RCTL_DD_UNSOL_CMD: /* command */ |
| 535 | ft_recv_cmd(sess, fp); |
| 536 | break; |
| 537 | case FC_RCTL_DD_SOL_DATA: /* write data */ |
| 538 | case FC_RCTL_DD_UNSOL_CTL: |
| 539 | case FC_RCTL_DD_SOL_CTL: |
| 540 | case FC_RCTL_DD_DATA_DESC: /* transfer ready */ |
| 541 | case FC_RCTL_ELS4_REQ: /* SRR, perhaps */ |
| 542 | default: |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 543 | pr_debug("%s: unhandled frame r_ctl %x\n", |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 544 | __func__, fh->fh_r_ctl); |
| 545 | fc_frame_free(fp); |
| 546 | ft_sess_put(sess); /* undo get from lookup */ |
| 547 | break; |
| 548 | } |
| 549 | } |
| 550 | |
| 551 | /* |
| 552 | * Send new command to target. |
| 553 | */ |
| 554 | static void ft_send_cmd(struct ft_cmd *cmd) |
| 555 | { |
| 556 | struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame); |
| 557 | struct se_cmd *se_cmd; |
| 558 | struct fcp_cmnd *fcp; |
| 559 | int data_dir; |
| 560 | u32 data_len; |
| 561 | int task_attr; |
| 562 | int ret; |
| 563 | |
| 564 | fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp)); |
| 565 | if (!fcp) |
| 566 | goto err; |
| 567 | |
| 568 | if (fcp->fc_flags & FCP_CFL_LEN_MASK) |
| 569 | goto err; /* not handling longer CDBs yet */ |
| 570 | |
| 571 | if (fcp->fc_tm_flags) { |
| 572 | task_attr = FCP_PTA_SIMPLE; |
| 573 | data_dir = DMA_NONE; |
| 574 | data_len = 0; |
| 575 | } else { |
| 576 | switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) { |
| 577 | case 0: |
| 578 | data_dir = DMA_NONE; |
| 579 | break; |
| 580 | case FCP_CFL_RDDATA: |
| 581 | data_dir = DMA_FROM_DEVICE; |
| 582 | break; |
| 583 | case FCP_CFL_WRDATA: |
| 584 | data_dir = DMA_TO_DEVICE; |
| 585 | break; |
| 586 | case FCP_CFL_WRDATA | FCP_CFL_RDDATA: |
| 587 | goto err; /* TBD not supported by tcm_fc yet */ |
| 588 | } |
Nicholas Bellinger | 61db180 | 2011-05-19 20:19:14 -0700 | [diff] [blame] | 589 | /* |
| 590 | * Locate the SAM Task Attr from fc_pri_ta |
| 591 | */ |
| 592 | switch (fcp->fc_pri_ta & FCP_PTA_MASK) { |
| 593 | case FCP_PTA_HEADQ: |
| 594 | task_attr = MSG_HEAD_TAG; |
| 595 | break; |
| 596 | case FCP_PTA_ORDERED: |
| 597 | task_attr = MSG_ORDERED_TAG; |
| 598 | break; |
| 599 | case FCP_PTA_ACA: |
| 600 | task_attr = MSG_ACA_TAG; |
| 601 | break; |
| 602 | case FCP_PTA_SIMPLE: /* Fallthrough */ |
| 603 | default: |
| 604 | task_attr = MSG_SIMPLE_TAG; |
| 605 | } |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 606 | |
Nicholas Bellinger | 61db180 | 2011-05-19 20:19:14 -0700 | [diff] [blame] | 607 | |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 608 | task_attr = fcp->fc_pri_ta & FCP_PTA_MASK; |
| 609 | data_len = ntohl(fcp->fc_dl); |
| 610 | cmd->cdb = fcp->fc_cdb; |
| 611 | } |
| 612 | |
| 613 | se_cmd = &cmd->se_cmd; |
| 614 | /* |
| 615 | * Initialize struct se_cmd descriptor from target_core_mod |
| 616 | * infrastructure |
| 617 | */ |
| 618 | transport_init_se_cmd(se_cmd, &ft_configfs->tf_ops, cmd->sess->se_sess, |
| 619 | data_len, data_dir, task_attr, |
| 620 | &cmd->ft_sense_buffer[0]); |
| 621 | /* |
| 622 | * Check for FCP task management flags |
| 623 | */ |
| 624 | if (fcp->fc_tm_flags) { |
| 625 | ft_send_tm(cmd); |
| 626 | return; |
| 627 | } |
| 628 | |
| 629 | fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd); |
| 630 | |
Kiran Patil | 61db952 | 2011-06-22 16:30:22 -0700 | [diff] [blame] | 631 | cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun); |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 632 | ret = transport_lookup_cmd_lun(&cmd->se_cmd, cmd->lun); |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 633 | if (ret < 0) { |
| 634 | ft_dump_cmd(cmd, __func__); |
| 635 | transport_send_check_condition_and_sense(&cmd->se_cmd, |
| 636 | cmd->se_cmd.scsi_sense_reason, 0); |
| 637 | return; |
| 638 | } |
| 639 | |
| 640 | ret = transport_generic_allocate_tasks(se_cmd, cmd->cdb); |
| 641 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 642 | pr_debug("r_ctl %x alloc task ret %d\n", fh->fh_r_ctl, ret); |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 643 | ft_dump_cmd(cmd, __func__); |
| 644 | |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 645 | if (ret == -ENOMEM) { |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 646 | transport_send_check_condition_and_sense(se_cmd, |
| 647 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
Christoph Hellwig | 3546297 | 2011-05-31 23:56:57 -0400 | [diff] [blame] | 648 | transport_generic_free_cmd(se_cmd, 0, 0); |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 649 | return; |
| 650 | } |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 651 | if (ret == -EINVAL) { |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 652 | if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT) |
| 653 | ft_queue_status(se_cmd); |
| 654 | else |
| 655 | transport_send_check_condition_and_sense(se_cmd, |
| 656 | se_cmd->scsi_sense_reason, 0); |
Christoph Hellwig | 3546297 | 2011-05-31 23:56:57 -0400 | [diff] [blame] | 657 | transport_generic_free_cmd(se_cmd, 0, 0); |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 658 | return; |
| 659 | } |
| 660 | transport_generic_handle_cdb(se_cmd); |
| 661 | return; |
| 662 | |
| 663 | err: |
| 664 | ft_send_resp_code(cmd, FCP_CMND_FIELDS_INVALID); |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 665 | } |
| 666 | |
| 667 | /* |
| 668 | * Handle request in the command thread. |
| 669 | */ |
| 670 | static void ft_exec_req(struct ft_cmd *cmd) |
| 671 | { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 672 | pr_debug("cmd state %x\n", cmd->state); |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 673 | switch (cmd->state) { |
| 674 | case FC_CMD_ST_NEW: |
| 675 | ft_send_cmd(cmd); |
| 676 | break; |
| 677 | default: |
| 678 | break; |
| 679 | } |
| 680 | } |
| 681 | |
| 682 | /* |
| 683 | * Processing thread. |
| 684 | * Currently one thread per tpg. |
| 685 | */ |
| 686 | int ft_thread(void *arg) |
| 687 | { |
| 688 | struct ft_tpg *tpg = arg; |
| 689 | struct se_queue_obj *qobj = &tpg->qobj; |
| 690 | struct ft_cmd *cmd; |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 691 | |
| 692 | while (!kthread_should_stop()) { |
Nicholas Bellinger | 2be1814 | 2011-05-27 13:58:48 -0700 | [diff] [blame] | 693 | schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT); |
| 694 | if (kthread_should_stop()) |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 695 | goto out; |
Nicholas Bellinger | 2be1814 | 2011-05-27 13:58:48 -0700 | [diff] [blame] | 696 | |
Kiran Patil | 3699d92 | 2011-04-18 16:24:14 -0700 | [diff] [blame] | 697 | cmd = ft_dequeue_cmd(qobj); |
| 698 | if (cmd) |
| 699 | ft_exec_req(cmd); |
| 700 | } |
| 701 | |
| 702 | out: |
| 703 | return 0; |
| 704 | } |