Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 1 | /* |
| 2 | * iSCSI Initiator over iSER Data-Path |
| 3 | * |
| 4 | * Copyright (C) 2004 Dmitry Yusupov |
| 5 | * Copyright (C) 2004 Alex Aizman |
| 6 | * Copyright (C) 2005 Mike Christie |
| 7 | * Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved. |
| 8 | * maintained by openib-general@openib.org |
| 9 | * |
| 10 | * This software is available to you under a choice of one of two |
| 11 | * licenses. You may choose to be licensed under the terms of the GNU |
| 12 | * General Public License (GPL) Version 2, available from the file |
| 13 | * COPYING in the main directory of this source tree, or the |
| 14 | * OpenIB.org BSD license below: |
| 15 | * |
| 16 | * Redistribution and use in source and binary forms, with or |
| 17 | * without modification, are permitted provided that the following |
| 18 | * conditions are met: |
| 19 | * |
| 20 | * - Redistributions of source code must retain the above |
| 21 | * copyright notice, this list of conditions and the following |
| 22 | * disclaimer. |
| 23 | * |
| 24 | * - Redistributions in binary form must reproduce the above |
| 25 | * copyright notice, this list of conditions and the following |
| 26 | * disclaimer in the documentation and/or other materials |
| 27 | * provided with the distribution. |
| 28 | * |
| 29 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 30 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 31 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 32 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| 33 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| 34 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 35 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 36 | * SOFTWARE. |
| 37 | * |
| 38 | * Credits: |
| 39 | * Christoph Hellwig |
| 40 | * FUJITA Tomonori |
| 41 | * Arne Redlich |
| 42 | * Zhenyu Wang |
| 43 | * Modified by: |
| 44 | * Erez Zilber |
| 45 | * |
| 46 | * |
| 47 | * $Id: iscsi_iser.c 6965 2006-05-07 11:36:20Z ogerlitz $ |
| 48 | */ |
| 49 | |
| 50 | #include <linux/types.h> |
| 51 | #include <linux/list.h> |
| 52 | #include <linux/hardirq.h> |
| 53 | #include <linux/kfifo.h> |
| 54 | #include <linux/blkdev.h> |
| 55 | #include <linux/init.h> |
| 56 | #include <linux/ioctl.h> |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 57 | #include <linux/cdev.h> |
| 58 | #include <linux/in.h> |
| 59 | #include <linux/net.h> |
| 60 | #include <linux/scatterlist.h> |
| 61 | #include <linux/delay.h> |
| 62 | |
| 63 | #include <net/sock.h> |
| 64 | |
| 65 | #include <asm/uaccess.h> |
| 66 | |
| 67 | #include <scsi/scsi_cmnd.h> |
| 68 | #include <scsi/scsi_device.h> |
| 69 | #include <scsi/scsi_eh.h> |
| 70 | #include <scsi/scsi_tcq.h> |
| 71 | #include <scsi/scsi_host.h> |
| 72 | #include <scsi/scsi.h> |
| 73 | #include <scsi/scsi_transport_iscsi.h> |
| 74 | |
| 75 | #include "iscsi_iser.h" |
| 76 | |
| 77 | static unsigned int iscsi_max_lun = 512; |
| 78 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); |
| 79 | |
| 80 | int iser_debug_level = 0; |
| 81 | |
| 82 | MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover " |
| 83 | "v" DRV_VER " (" DRV_DATE ")"); |
| 84 | MODULE_LICENSE("Dual BSD/GPL"); |
| 85 | MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); |
| 86 | |
| 87 | module_param_named(debug_level, iser_debug_level, int, 0644); |
| 88 | MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); |
| 89 | |
| 90 | struct iser_global ig; |
| 91 | |
| 92 | void |
| 93 | iscsi_iser_recv(struct iscsi_conn *conn, |
| 94 | struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) |
| 95 | { |
| 96 | int rc = 0; |
| 97 | uint32_t ret_itt; |
| 98 | int datalen; |
| 99 | int ahslen; |
| 100 | |
| 101 | /* verify PDU length */ |
| 102 | datalen = ntoh24(hdr->dlength); |
| 103 | if (datalen != rx_data_len) { |
| 104 | printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n", |
| 105 | datalen, rx_data_len); |
| 106 | rc = ISCSI_ERR_DATALEN; |
| 107 | goto error; |
| 108 | } |
| 109 | |
| 110 | /* read AHS */ |
| 111 | ahslen = hdr->hlength * 4; |
| 112 | |
| 113 | /* verify itt (itt encoding: age+cid+itt) */ |
| 114 | rc = iscsi_verify_itt(conn, hdr, &ret_itt); |
| 115 | |
| 116 | if (!rc) |
| 117 | rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); |
| 118 | |
| 119 | if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) |
| 120 | goto error; |
| 121 | |
| 122 | return; |
| 123 | error: |
| 124 | iscsi_conn_failure(conn, rc); |
| 125 | } |
| 126 | |
| 127 | |
| 128 | /** |
| 129 | * iscsi_iser_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands |
| 130 | * |
| 131 | **/ |
| 132 | static void |
| 133 | iscsi_iser_cmd_init(struct iscsi_cmd_task *ctask) |
| 134 | { |
| 135 | struct iscsi_iser_conn *iser_conn = ctask->conn->dd_data; |
| 136 | struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; |
| 137 | struct scsi_cmnd *sc = ctask->sc; |
| 138 | |
| 139 | iser_ctask->command_sent = 0; |
| 140 | iser_ctask->iser_conn = iser_conn; |
| 141 | |
| 142 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
| 143 | BUG_ON(ctask->total_length == 0); |
| 144 | /* bytes to be sent via RDMA operations */ |
| 145 | iser_ctask->rdma_data_count = ctask->total_length - |
| 146 | ctask->imm_count - |
| 147 | ctask->unsol_count; |
| 148 | |
| 149 | debug_scsi("cmd [itt %x total %d imm %d unsol_data %d " |
| 150 | "rdma_data %d]\n", |
| 151 | ctask->itt, ctask->total_length, ctask->imm_count, |
| 152 | ctask->unsol_count, iser_ctask->rdma_data_count); |
| 153 | } else |
| 154 | /* bytes to be sent via RDMA operations */ |
| 155 | iser_ctask->rdma_data_count = ctask->total_length; |
| 156 | |
| 157 | iser_ctask_rdma_init(iser_ctask); |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * iscsi_mtask_xmit - xmit management(immediate) task |
| 162 | * @conn: iscsi connection |
| 163 | * @mtask: task management task |
| 164 | * |
| 165 | * Notes: |
| 166 | * The function can return -EAGAIN in which case caller must |
| 167 | * call it again later, or recover. '0' return code means successful |
| 168 | * xmit. |
| 169 | * |
| 170 | **/ |
| 171 | static int |
| 172 | iscsi_iser_mtask_xmit(struct iscsi_conn *conn, |
| 173 | struct iscsi_mgmt_task *mtask) |
| 174 | { |
| 175 | int error = 0; |
| 176 | |
| 177 | debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id, mtask->itt); |
| 178 | |
| 179 | error = iser_send_control(conn, mtask); |
| 180 | |
| 181 | /* since iser xmits control with zero copy, mtasks can not be recycled |
| 182 | * right after sending them. |
| 183 | * The recycling scheme is based on whether a response is expected |
| 184 | * - if yes, the mtask is recycled at iscsi_complete_pdu |
| 185 | * - if no, the mtask is recycled at iser_snd_completion |
| 186 | */ |
| 187 | if (error && error != -EAGAIN) |
| 188 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| 189 | |
| 190 | return error; |
| 191 | } |
| 192 | |
| 193 | static int |
| 194 | iscsi_iser_ctask_xmit_unsol_data(struct iscsi_conn *conn, |
| 195 | struct iscsi_cmd_task *ctask) |
| 196 | { |
| 197 | struct iscsi_data hdr; |
| 198 | int error = 0; |
| 199 | struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; |
| 200 | |
| 201 | /* Send data-out PDUs while there's still unsolicited data to send */ |
| 202 | while (ctask->unsol_count > 0) { |
| 203 | iscsi_prep_unsolicit_data_pdu(ctask, &hdr, |
| 204 | iser_ctask->rdma_data_count); |
| 205 | |
| 206 | debug_scsi("Sending data-out: itt 0x%x, data count %d\n", |
| 207 | hdr.itt, ctask->data_count); |
| 208 | |
| 209 | /* the buffer description has been passed with the command */ |
| 210 | /* Send the command */ |
| 211 | error = iser_send_data_out(conn, ctask, &hdr); |
| 212 | if (error) { |
| 213 | ctask->unsol_datasn--; |
| 214 | goto iscsi_iser_ctask_xmit_unsol_data_exit; |
| 215 | } |
| 216 | ctask->unsol_count -= ctask->data_count; |
| 217 | debug_scsi("Need to send %d more as data-out PDUs\n", |
| 218 | ctask->unsol_count); |
| 219 | } |
| 220 | |
| 221 | iscsi_iser_ctask_xmit_unsol_data_exit: |
| 222 | return error; |
| 223 | } |
| 224 | |
| 225 | static int |
| 226 | iscsi_iser_ctask_xmit(struct iscsi_conn *conn, |
| 227 | struct iscsi_cmd_task *ctask) |
| 228 | { |
| 229 | struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; |
| 230 | int error = 0; |
| 231 | |
| 232 | debug_scsi("ctask deq [cid %d itt 0x%x]\n", |
| 233 | conn->id, ctask->itt); |
| 234 | |
| 235 | /* |
| 236 | * serialize with TMF AbortTask |
| 237 | */ |
| 238 | if (ctask->mtask) |
| 239 | return error; |
| 240 | |
| 241 | /* Send the cmd PDU */ |
| 242 | if (!iser_ctask->command_sent) { |
| 243 | error = iser_send_command(conn, ctask); |
| 244 | if (error) |
| 245 | goto iscsi_iser_ctask_xmit_exit; |
| 246 | iser_ctask->command_sent = 1; |
| 247 | } |
| 248 | |
| 249 | /* Send unsolicited data-out PDU(s) if necessary */ |
| 250 | if (ctask->unsol_count) |
| 251 | error = iscsi_iser_ctask_xmit_unsol_data(conn, ctask); |
| 252 | |
| 253 | iscsi_iser_ctask_xmit_exit: |
| 254 | if (error && error != -EAGAIN) |
| 255 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| 256 | return error; |
| 257 | } |
| 258 | |
| 259 | static void |
| 260 | iscsi_iser_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
| 261 | { |
| 262 | struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; |
| 263 | |
| 264 | if (iser_ctask->status == ISER_TASK_STATUS_STARTED) { |
| 265 | iser_ctask->status = ISER_TASK_STATUS_COMPLETED; |
| 266 | iser_ctask_rdma_finalize(iser_ctask); |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | static struct iser_conn * |
| 271 | iscsi_iser_ib_conn_lookup(__u64 ep_handle) |
| 272 | { |
| 273 | struct iser_conn *ib_conn; |
| 274 | struct iser_conn *uib_conn = (struct iser_conn *)(unsigned long)ep_handle; |
| 275 | |
| 276 | mutex_lock(&ig.connlist_mutex); |
| 277 | list_for_each_entry(ib_conn, &ig.connlist, conn_list) { |
| 278 | if (ib_conn == uib_conn) { |
| 279 | mutex_unlock(&ig.connlist_mutex); |
| 280 | return ib_conn; |
| 281 | } |
| 282 | } |
| 283 | mutex_unlock(&ig.connlist_mutex); |
| 284 | iser_err("no conn exists for eph %llx\n",(unsigned long long)ep_handle); |
| 285 | return NULL; |
| 286 | } |
| 287 | |
| 288 | static struct iscsi_cls_conn * |
| 289 | iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) |
| 290 | { |
| 291 | struct iscsi_conn *conn; |
| 292 | struct iscsi_cls_conn *cls_conn; |
| 293 | struct iscsi_iser_conn *iser_conn; |
| 294 | |
| 295 | cls_conn = iscsi_conn_setup(cls_session, conn_idx); |
| 296 | if (!cls_conn) |
| 297 | return NULL; |
| 298 | conn = cls_conn->dd_data; |
| 299 | |
| 300 | /* |
| 301 | * due to issues with the login code re iser sematics |
| 302 | * this not set in iscsi_conn_setup - FIXME |
| 303 | */ |
| 304 | conn->max_recv_dlength = 128; |
| 305 | |
| 306 | iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL); |
| 307 | if (!iser_conn) |
| 308 | goto conn_alloc_fail; |
| 309 | |
| 310 | /* currently this is the only field which need to be initiated */ |
| 311 | rwlock_init(&iser_conn->lock); |
| 312 | |
| 313 | conn->dd_data = iser_conn; |
| 314 | iser_conn->iscsi_conn = conn; |
| 315 | |
| 316 | return cls_conn; |
| 317 | |
| 318 | conn_alloc_fail: |
| 319 | iscsi_conn_teardown(cls_conn); |
| 320 | return NULL; |
| 321 | } |
| 322 | |
| 323 | static void |
| 324 | iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) |
| 325 | { |
| 326 | struct iscsi_conn *conn = cls_conn->dd_data; |
| 327 | struct iscsi_iser_conn *iser_conn = conn->dd_data; |
| 328 | |
| 329 | iscsi_conn_teardown(cls_conn); |
| 330 | kfree(iser_conn); |
| 331 | } |
| 332 | |
| 333 | static int |
| 334 | iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, |
| 335 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
| 336 | int is_leading) |
| 337 | { |
| 338 | struct iscsi_conn *conn = cls_conn->dd_data; |
| 339 | struct iscsi_iser_conn *iser_conn; |
| 340 | struct iser_conn *ib_conn; |
| 341 | int error; |
| 342 | |
| 343 | error = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
| 344 | if (error) |
| 345 | return error; |
| 346 | |
| 347 | /* the transport ep handle comes from user space so it must be |
| 348 | * verified against the global ib connections list */ |
| 349 | ib_conn = iscsi_iser_ib_conn_lookup(transport_eph); |
| 350 | if (!ib_conn) { |
| 351 | iser_err("can't bind eph %llx\n", |
| 352 | (unsigned long long)transport_eph); |
| 353 | return -EINVAL; |
| 354 | } |
| 355 | /* binds the iSER connection retrieved from the previously |
| 356 | * connected ep_handle to the iSCSI layer connection. exchanges |
| 357 | * connection pointers */ |
| 358 | iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn); |
| 359 | iser_conn = conn->dd_data; |
| 360 | ib_conn->iser_conn = iser_conn; |
| 361 | iser_conn->ib_conn = ib_conn; |
| 362 | |
| 363 | conn->recv_lock = &iser_conn->lock; |
| 364 | |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | static int |
| 369 | iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) |
| 370 | { |
| 371 | struct iscsi_conn *conn = cls_conn->dd_data; |
| 372 | int err; |
| 373 | |
| 374 | err = iscsi_conn_start(cls_conn); |
| 375 | if (err) |
| 376 | return err; |
| 377 | |
| 378 | return iser_conn_set_full_featured_mode(conn); |
| 379 | } |
| 380 | |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 381 | static struct iscsi_transport iscsi_iser_transport; |
| 382 | |
| 383 | static struct iscsi_cls_session * |
| 384 | iscsi_iser_session_create(struct iscsi_transport *iscsit, |
| 385 | struct scsi_transport_template *scsit, |
| 386 | uint32_t initial_cmdsn, uint32_t *hostno) |
| 387 | { |
| 388 | struct iscsi_cls_session *cls_session; |
| 389 | struct iscsi_session *session; |
| 390 | int i; |
| 391 | uint32_t hn; |
| 392 | struct iscsi_cmd_task *ctask; |
| 393 | struct iscsi_mgmt_task *mtask; |
| 394 | struct iscsi_iser_cmd_task *iser_ctask; |
| 395 | struct iser_desc *desc; |
| 396 | |
| 397 | cls_session = iscsi_session_setup(iscsit, scsit, |
| 398 | sizeof(struct iscsi_iser_cmd_task), |
| 399 | sizeof(struct iser_desc), |
| 400 | initial_cmdsn, &hn); |
| 401 | if (!cls_session) |
| 402 | return NULL; |
| 403 | |
| 404 | *hostno = hn; |
| 405 | session = class_to_transport_session(cls_session); |
| 406 | |
| 407 | /* libiscsi setup itts, data and pool so just set desc fields */ |
| 408 | for (i = 0; i < session->cmds_max; i++) { |
| 409 | ctask = session->cmds[i]; |
| 410 | iser_ctask = ctask->dd_data; |
| 411 | ctask->hdr = (struct iscsi_cmd *)&iser_ctask->desc.iscsi_header; |
| 412 | } |
| 413 | |
| 414 | for (i = 0; i < session->mgmtpool_max; i++) { |
| 415 | mtask = session->mgmt_cmds[i]; |
| 416 | desc = mtask->dd_data; |
| 417 | mtask->hdr = &desc->iscsi_header; |
| 418 | desc->data = mtask->data; |
| 419 | } |
| 420 | |
| 421 | return cls_session; |
| 422 | } |
| 423 | |
| 424 | static int |
Mike Christie | 358ff01 | 2006-06-28 12:00:25 -0500 | [diff] [blame] | 425 | iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, |
| 426 | enum iscsi_param param, char *buf, int buflen) |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 427 | { |
Mike Christie | 358ff01 | 2006-06-28 12:00:25 -0500 | [diff] [blame] | 428 | int value; |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 429 | |
| 430 | switch (param) { |
| 431 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
| 432 | /* TBD */ |
| 433 | break; |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 434 | case ISCSI_PARAM_HDRDGST_EN: |
Mike Christie | 358ff01 | 2006-06-28 12:00:25 -0500 | [diff] [blame] | 435 | sscanf(buf, "%d", &value); |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 436 | if (value) { |
| 437 | printk(KERN_ERR "DataDigest wasn't negotiated to None"); |
| 438 | return -EPROTO; |
| 439 | } |
| 440 | break; |
| 441 | case ISCSI_PARAM_DATADGST_EN: |
Mike Christie | 358ff01 | 2006-06-28 12:00:25 -0500 | [diff] [blame] | 442 | sscanf(buf, "%d", &value); |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 443 | if (value) { |
| 444 | printk(KERN_ERR "DataDigest wasn't negotiated to None"); |
| 445 | return -EPROTO; |
| 446 | } |
| 447 | break; |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 448 | case ISCSI_PARAM_IFMARKER_EN: |
Mike Christie | 358ff01 | 2006-06-28 12:00:25 -0500 | [diff] [blame] | 449 | sscanf(buf, "%d", &value); |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 450 | if (value) { |
| 451 | printk(KERN_ERR "IFMarker wasn't negotiated to No"); |
| 452 | return -EPROTO; |
| 453 | } |
| 454 | break; |
| 455 | case ISCSI_PARAM_OFMARKER_EN: |
Mike Christie | 358ff01 | 2006-06-28 12:00:25 -0500 | [diff] [blame] | 456 | sscanf(buf, "%d", &value); |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 457 | if (value) { |
| 458 | printk(KERN_ERR "OFMarker wasn't negotiated to No"); |
| 459 | return -EPROTO; |
| 460 | } |
| 461 | break; |
| 462 | default: |
Mike Christie | 358ff01 | 2006-06-28 12:00:25 -0500 | [diff] [blame] | 463 | return iscsi_set_param(cls_conn, param, buf, buflen); |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 464 | } |
| 465 | |
| 466 | return 0; |
| 467 | } |
| 468 | |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 469 | static void |
| 470 | iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
| 471 | { |
| 472 | struct iscsi_conn *conn = cls_conn->dd_data; |
| 473 | |
| 474 | stats->txdata_octets = conn->txdata_octets; |
| 475 | stats->rxdata_octets = conn->rxdata_octets; |
| 476 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; |
| 477 | stats->dataout_pdus = conn->dataout_pdus_cnt; |
| 478 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; |
| 479 | stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ |
| 480 | stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ |
| 481 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; |
| 482 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; |
| 483 | stats->custom_length = 3; |
| 484 | strcpy(stats->custom[0].desc, "qp_tx_queue_full"); |
| 485 | stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ |
| 486 | strcpy(stats->custom[1].desc, "fmr_map_not_avail"); |
| 487 | stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; |
| 488 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
| 489 | stats->custom[2].value = conn->eh_abort_cnt; |
| 490 | } |
| 491 | |
| 492 | static int |
| 493 | iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking, |
| 494 | __u64 *ep_handle) |
| 495 | { |
| 496 | int err; |
| 497 | struct iser_conn *ib_conn; |
| 498 | |
| 499 | err = iser_conn_init(&ib_conn); |
| 500 | if (err) |
| 501 | goto out; |
| 502 | |
| 503 | err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, non_blocking); |
| 504 | if (!err) |
| 505 | *ep_handle = (__u64)(unsigned long)ib_conn; |
| 506 | |
| 507 | out: |
| 508 | return err; |
| 509 | } |
| 510 | |
| 511 | static int |
| 512 | iscsi_iser_ep_poll(__u64 ep_handle, int timeout_ms) |
| 513 | { |
| 514 | struct iser_conn *ib_conn = iscsi_iser_ib_conn_lookup(ep_handle); |
| 515 | int rc; |
| 516 | |
| 517 | if (!ib_conn) |
| 518 | return -EINVAL; |
| 519 | |
| 520 | rc = wait_event_interruptible_timeout(ib_conn->wait, |
| 521 | ib_conn->state == ISER_CONN_UP, |
| 522 | msecs_to_jiffies(timeout_ms)); |
| 523 | |
| 524 | /* if conn establishment failed, return error code to iscsi */ |
| 525 | if (!rc && |
| 526 | (ib_conn->state == ISER_CONN_TERMINATING || |
| 527 | ib_conn->state == ISER_CONN_DOWN)) |
| 528 | rc = -1; |
| 529 | |
| 530 | iser_err("ib conn %p rc = %d\n", ib_conn, rc); |
| 531 | |
| 532 | if (rc > 0) |
| 533 | return 1; /* success, this is the equivalent of POLLOUT */ |
| 534 | else if (!rc) |
| 535 | return 0; /* timeout */ |
| 536 | else |
| 537 | return rc; /* signal */ |
| 538 | } |
| 539 | |
| 540 | static void |
| 541 | iscsi_iser_ep_disconnect(__u64 ep_handle) |
| 542 | { |
Mike Christie | 1c83469 | 2006-07-24 15:47:26 -0500 | [diff] [blame] | 543 | struct iser_conn *ib_conn; |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 544 | |
Mike Christie | 1c83469 | 2006-07-24 15:47:26 -0500 | [diff] [blame] | 545 | ib_conn = iscsi_iser_ib_conn_lookup(ep_handle); |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 546 | if (!ib_conn) |
| 547 | return; |
| 548 | |
| 549 | iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 550 | iser_conn_terminate(ib_conn); |
| 551 | } |
| 552 | |
| 553 | static struct scsi_host_template iscsi_iser_sht = { |
| 554 | .name = "iSCSI Initiator over iSER, v." DRV_VER, |
| 555 | .queuecommand = iscsi_queuecommand, |
| 556 | .can_queue = ISCSI_XMIT_CMDS_MAX - 1, |
| 557 | .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, |
Erez Zilber | 8072ec2 | 2006-09-11 12:20:54 +0300 | [diff] [blame] | 558 | .max_sectors = 1024, |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 559 | .cmd_per_lun = ISCSI_MAX_CMD_PER_LUN, |
| 560 | .eh_abort_handler = iscsi_eh_abort, |
| 561 | .eh_host_reset_handler = iscsi_eh_host_reset, |
| 562 | .use_clustering = DISABLE_CLUSTERING, |
| 563 | .proc_name = "iscsi_iser", |
| 564 | .this_id = -1, |
| 565 | }; |
| 566 | |
| 567 | static struct iscsi_transport iscsi_iser_transport = { |
| 568 | .owner = THIS_MODULE, |
| 569 | .name = "iser", |
| 570 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, |
| 571 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
| 572 | ISCSI_MAX_XMIT_DLENGTH | |
| 573 | ISCSI_HDRDGST_EN | |
| 574 | ISCSI_DATADGST_EN | |
| 575 | ISCSI_INITIAL_R2T_EN | |
| 576 | ISCSI_MAX_R2T | |
| 577 | ISCSI_IMM_DATA_EN | |
| 578 | ISCSI_FIRST_BURST | |
| 579 | ISCSI_MAX_BURST | |
| 580 | ISCSI_PDU_INORDER_EN | |
Mike Christie | 358ff01 | 2006-06-28 12:00:25 -0500 | [diff] [blame] | 581 | ISCSI_DATASEQ_INORDER_EN | |
| 582 | ISCSI_EXP_STATSN | |
| 583 | ISCSI_PERSISTENT_PORT | |
| 584 | ISCSI_PERSISTENT_ADDRESS | |
| 585 | ISCSI_TARGET_NAME | |
| 586 | ISCSI_TPGT, |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 587 | .host_template = &iscsi_iser_sht, |
| 588 | .conndata_size = sizeof(struct iscsi_conn), |
| 589 | .max_lun = ISCSI_ISER_MAX_LUN, |
| 590 | .max_cmd_len = ISCSI_ISER_MAX_CMD_LEN, |
| 591 | /* session management */ |
| 592 | .create_session = iscsi_iser_session_create, |
| 593 | .destroy_session = iscsi_session_teardown, |
| 594 | /* connection management */ |
| 595 | .create_conn = iscsi_iser_conn_create, |
| 596 | .bind_conn = iscsi_iser_conn_bind, |
| 597 | .destroy_conn = iscsi_iser_conn_destroy, |
Mike Christie | 358ff01 | 2006-06-28 12:00:25 -0500 | [diff] [blame] | 598 | .set_param = iscsi_iser_set_param, |
| 599 | .get_conn_param = iscsi_conn_get_param, |
| 600 | .get_session_param = iscsi_session_get_param, |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 601 | .start_conn = iscsi_iser_conn_start, |
| 602 | .stop_conn = iscsi_conn_stop, |
Or Gerlitz | 65e7ae7 | 2006-05-11 10:00:44 +0300 | [diff] [blame] | 603 | /* IO */ |
| 604 | .send_pdu = iscsi_conn_send_pdu, |
| 605 | .get_stats = iscsi_iser_conn_get_stats, |
| 606 | .init_cmd_task = iscsi_iser_cmd_init, |
| 607 | .xmit_cmd_task = iscsi_iser_ctask_xmit, |
| 608 | .xmit_mgmt_task = iscsi_iser_mtask_xmit, |
| 609 | .cleanup_cmd_task = iscsi_iser_cleanup_ctask, |
| 610 | /* recovery */ |
| 611 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
| 612 | |
| 613 | .ep_connect = iscsi_iser_ep_connect, |
| 614 | .ep_poll = iscsi_iser_ep_poll, |
| 615 | .ep_disconnect = iscsi_iser_ep_disconnect |
| 616 | }; |
| 617 | |
| 618 | static int __init iser_init(void) |
| 619 | { |
| 620 | int err; |
| 621 | |
| 622 | iser_dbg("Starting iSER datamover...\n"); |
| 623 | |
| 624 | if (iscsi_max_lun < 1) { |
| 625 | printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); |
| 626 | return -EINVAL; |
| 627 | } |
| 628 | |
| 629 | iscsi_iser_transport.max_lun = iscsi_max_lun; |
| 630 | |
| 631 | memset(&ig, 0, sizeof(struct iser_global)); |
| 632 | |
| 633 | ig.desc_cache = kmem_cache_create("iser_descriptors", |
| 634 | sizeof (struct iser_desc), |
| 635 | 0, SLAB_HWCACHE_ALIGN, |
| 636 | NULL, NULL); |
| 637 | if (ig.desc_cache == NULL) |
| 638 | return -ENOMEM; |
| 639 | |
| 640 | /* device init is called only after the first addr resolution */ |
| 641 | mutex_init(&ig.device_list_mutex); |
| 642 | INIT_LIST_HEAD(&ig.device_list); |
| 643 | mutex_init(&ig.connlist_mutex); |
| 644 | INIT_LIST_HEAD(&ig.connlist); |
| 645 | |
| 646 | if (!iscsi_register_transport(&iscsi_iser_transport)) { |
| 647 | iser_err("iscsi_register_transport failed\n"); |
| 648 | err = -EINVAL; |
| 649 | goto register_transport_failure; |
| 650 | } |
| 651 | |
| 652 | return 0; |
| 653 | |
| 654 | register_transport_failure: |
| 655 | kmem_cache_destroy(ig.desc_cache); |
| 656 | |
| 657 | return err; |
| 658 | } |
| 659 | |
| 660 | static void __exit iser_exit(void) |
| 661 | { |
| 662 | iser_dbg("Removing iSER datamover...\n"); |
| 663 | iscsi_unregister_transport(&iscsi_iser_transport); |
| 664 | kmem_cache_destroy(ig.desc_cache); |
| 665 | } |
| 666 | |
| 667 | module_init(iser_init); |
| 668 | module_exit(iser_exit); |