165e7ae7bSOr Gerlitz /* 265e7ae7bSOr Gerlitz * iSCSI Initiator over iSER Data-Path 365e7ae7bSOr Gerlitz * 465e7ae7bSOr Gerlitz * Copyright (C) 2004 Dmitry Yusupov 565e7ae7bSOr Gerlitz * Copyright (C) 2004 Alex Aizman 665e7ae7bSOr Gerlitz * Copyright (C) 2005 Mike Christie 765e7ae7bSOr Gerlitz * Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved. 865e7ae7bSOr Gerlitz * maintained by openib-general@openib.org 965e7ae7bSOr Gerlitz * 1065e7ae7bSOr Gerlitz * This software is available to you under a choice of one of two 1165e7ae7bSOr Gerlitz * licenses. You may choose to be licensed under the terms of the GNU 1265e7ae7bSOr Gerlitz * General Public License (GPL) Version 2, available from the file 1365e7ae7bSOr Gerlitz * COPYING in the main directory of this source tree, or the 1465e7ae7bSOr Gerlitz * OpenIB.org BSD license below: 1565e7ae7bSOr Gerlitz * 1665e7ae7bSOr Gerlitz * Redistribution and use in source and binary forms, with or 1765e7ae7bSOr Gerlitz * without modification, are permitted provided that the following 1865e7ae7bSOr Gerlitz * conditions are met: 1965e7ae7bSOr Gerlitz * 2065e7ae7bSOr Gerlitz * - Redistributions of source code must retain the above 2165e7ae7bSOr Gerlitz * copyright notice, this list of conditions and the following 2265e7ae7bSOr Gerlitz * disclaimer. 2365e7ae7bSOr Gerlitz * 2465e7ae7bSOr Gerlitz * - Redistributions in binary form must reproduce the above 2565e7ae7bSOr Gerlitz * copyright notice, this list of conditions and the following 2665e7ae7bSOr Gerlitz * disclaimer in the documentation and/or other materials 2765e7ae7bSOr Gerlitz * provided with the distribution. 2865e7ae7bSOr Gerlitz * 2965e7ae7bSOr Gerlitz * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 3065e7ae7bSOr Gerlitz * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 3165e7ae7bSOr Gerlitz * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 3265e7ae7bSOr Gerlitz * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 3365e7ae7bSOr Gerlitz * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 3465e7ae7bSOr Gerlitz * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 3565e7ae7bSOr Gerlitz * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 3665e7ae7bSOr Gerlitz * SOFTWARE. 3765e7ae7bSOr Gerlitz * 3865e7ae7bSOr Gerlitz * Credits: 3965e7ae7bSOr Gerlitz * Christoph Hellwig 4065e7ae7bSOr Gerlitz * FUJITA Tomonori 4165e7ae7bSOr Gerlitz * Arne Redlich 4265e7ae7bSOr Gerlitz * Zhenyu Wang 4365e7ae7bSOr Gerlitz * Modified by: 4465e7ae7bSOr Gerlitz * Erez Zilber 4565e7ae7bSOr Gerlitz * 4665e7ae7bSOr Gerlitz * 4765e7ae7bSOr Gerlitz * $Id: iscsi_iser.c 6965 2006-05-07 11:36:20Z ogerlitz $ 4865e7ae7bSOr Gerlitz */ 4965e7ae7bSOr Gerlitz 5065e7ae7bSOr Gerlitz #include <linux/types.h> 5165e7ae7bSOr Gerlitz #include <linux/list.h> 5265e7ae7bSOr Gerlitz #include <linux/hardirq.h> 5365e7ae7bSOr Gerlitz #include <linux/kfifo.h> 5465e7ae7bSOr Gerlitz #include <linux/blkdev.h> 5565e7ae7bSOr Gerlitz #include <linux/init.h> 5665e7ae7bSOr Gerlitz #include <linux/ioctl.h> 5765e7ae7bSOr Gerlitz #include <linux/cdev.h> 5865e7ae7bSOr Gerlitz #include <linux/in.h> 5965e7ae7bSOr Gerlitz #include <linux/net.h> 6065e7ae7bSOr Gerlitz #include <linux/scatterlist.h> 6165e7ae7bSOr Gerlitz #include <linux/delay.h> 6265e7ae7bSOr Gerlitz 6365e7ae7bSOr Gerlitz #include <net/sock.h> 6465e7ae7bSOr Gerlitz 6565e7ae7bSOr Gerlitz #include <asm/uaccess.h> 6665e7ae7bSOr Gerlitz 6765e7ae7bSOr Gerlitz #include <scsi/scsi_cmnd.h> 6865e7ae7bSOr Gerlitz #include <scsi/scsi_device.h> 6965e7ae7bSOr Gerlitz #include <scsi/scsi_eh.h> 7065e7ae7bSOr Gerlitz #include <scsi/scsi_tcq.h> 7165e7ae7bSOr Gerlitz #include <scsi/scsi_host.h> 7265e7ae7bSOr Gerlitz #include <scsi/scsi.h> 7365e7ae7bSOr Gerlitz #include <scsi/scsi_transport_iscsi.h> 7465e7ae7bSOr Gerlitz 7565e7ae7bSOr Gerlitz #include "iscsi_iser.h" 7665e7ae7bSOr Gerlitz 7775613521SMike Christie static struct scsi_host_template iscsi_iser_sht; 7875613521SMike Christie static struct iscsi_transport iscsi_iser_transport; 7975613521SMike Christie static struct scsi_transport_template *iscsi_iser_scsi_transport; 8075613521SMike Christie 8165e7ae7bSOr Gerlitz static unsigned int iscsi_max_lun = 512; 8265e7ae7bSOr Gerlitz module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); 8365e7ae7bSOr Gerlitz 8465e7ae7bSOr Gerlitz int iser_debug_level = 0; 8565e7ae7bSOr Gerlitz 8665e7ae7bSOr Gerlitz MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover " 8765e7ae7bSOr Gerlitz "v" DRV_VER " (" DRV_DATE ")"); 8865e7ae7bSOr Gerlitz MODULE_LICENSE("Dual BSD/GPL"); 8965e7ae7bSOr Gerlitz MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); 9065e7ae7bSOr Gerlitz 9165e7ae7bSOr Gerlitz module_param_named(debug_level, iser_debug_level, int, 0644); 9265e7ae7bSOr Gerlitz MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); 9365e7ae7bSOr Gerlitz 9465e7ae7bSOr Gerlitz struct iser_global ig; 9565e7ae7bSOr Gerlitz 9665e7ae7bSOr Gerlitz void 9765e7ae7bSOr Gerlitz iscsi_iser_recv(struct iscsi_conn *conn, 9865e7ae7bSOr Gerlitz struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) 9965e7ae7bSOr Gerlitz { 10065e7ae7bSOr Gerlitz int rc = 0; 10165e7ae7bSOr Gerlitz int datalen; 10265e7ae7bSOr Gerlitz int ahslen; 10365e7ae7bSOr Gerlitz 10465e7ae7bSOr Gerlitz /* verify PDU length */ 10565e7ae7bSOr Gerlitz datalen = ntoh24(hdr->dlength); 10665e7ae7bSOr Gerlitz if (datalen != rx_data_len) { 10765e7ae7bSOr Gerlitz printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n", 10865e7ae7bSOr Gerlitz datalen, rx_data_len); 10965e7ae7bSOr Gerlitz rc = ISCSI_ERR_DATALEN; 11065e7ae7bSOr Gerlitz goto error; 11165e7ae7bSOr Gerlitz } 11265e7ae7bSOr Gerlitz 11365e7ae7bSOr Gerlitz /* read AHS */ 11465e7ae7bSOr Gerlitz ahslen = hdr->hlength * 4; 11565e7ae7bSOr Gerlitz 11665e7ae7bSOr Gerlitz rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 11765e7ae7bSOr Gerlitz if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 11865e7ae7bSOr Gerlitz goto error; 11965e7ae7bSOr Gerlitz 12065e7ae7bSOr Gerlitz return; 12165e7ae7bSOr Gerlitz error: 12265e7ae7bSOr Gerlitz iscsi_conn_failure(conn, rc); 12365e7ae7bSOr Gerlitz } 12465e7ae7bSOr Gerlitz 12565e7ae7bSOr Gerlitz 12665e7ae7bSOr Gerlitz /** 1272261ec3dSMike Christie * iscsi_iser_task_init - Initialize task 1282261ec3dSMike Christie * @task: iscsi task 12965e7ae7bSOr Gerlitz * 1302261ec3dSMike Christie * Initialize the task for the scsi command or mgmt command. 1312747fdb2SMike Christie */ 132a8ac6311SOlaf Kirch static int 1332261ec3dSMike Christie iscsi_iser_task_init(struct iscsi_task *task) 13465e7ae7bSOr Gerlitz { 1352261ec3dSMike Christie struct iscsi_iser_conn *iser_conn = task->conn->dd_data; 1362261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 13765e7ae7bSOr Gerlitz 1382261ec3dSMike Christie /* mgmt task */ 1392261ec3dSMike Christie if (!task->sc) { 1402261ec3dSMike Christie iser_task->desc.data = task->data; 1412747fdb2SMike Christie return 0; 1422747fdb2SMike Christie } 1432747fdb2SMike Christie 1442261ec3dSMike Christie iser_task->command_sent = 0; 1452261ec3dSMike Christie iser_task->iser_conn = iser_conn; 1462261ec3dSMike Christie iser_task_rdma_init(iser_task); 147a8ac6311SOlaf Kirch return 0; 14865e7ae7bSOr Gerlitz } 14965e7ae7bSOr Gerlitz 15065e7ae7bSOr Gerlitz /** 1512261ec3dSMike Christie * iscsi_iser_mtask_xmit - xmit management(immediate) task 15265e7ae7bSOr Gerlitz * @conn: iscsi connection 1532261ec3dSMike Christie * @task: task management task 15465e7ae7bSOr Gerlitz * 15565e7ae7bSOr Gerlitz * Notes: 15665e7ae7bSOr Gerlitz * The function can return -EAGAIN in which case caller must 15765e7ae7bSOr Gerlitz * call it again later, or recover. '0' return code means successful 15865e7ae7bSOr Gerlitz * xmit. 15965e7ae7bSOr Gerlitz * 16065e7ae7bSOr Gerlitz **/ 16165e7ae7bSOr Gerlitz static int 1622261ec3dSMike Christie iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 16365e7ae7bSOr Gerlitz { 16465e7ae7bSOr Gerlitz int error = 0; 16565e7ae7bSOr Gerlitz 1662261ec3dSMike Christie debug_scsi("task deq [cid %d itt 0x%x]\n", conn->id, task->itt); 16765e7ae7bSOr Gerlitz 1682261ec3dSMike Christie error = iser_send_control(conn, task); 16965e7ae7bSOr Gerlitz 1702261ec3dSMike Christie /* since iser xmits control with zero copy, tasks can not be recycled 17165e7ae7bSOr Gerlitz * right after sending them. 17265e7ae7bSOr Gerlitz * The recycling scheme is based on whether a response is expected 1732261ec3dSMike Christie * - if yes, the task is recycled at iscsi_complete_pdu 1742261ec3dSMike Christie * - if no, the task is recycled at iser_snd_completion 17565e7ae7bSOr Gerlitz */ 176f0938401SErez Zilber if (error && error != -ENOBUFS) 17765e7ae7bSOr Gerlitz iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 17865e7ae7bSOr Gerlitz 17965e7ae7bSOr Gerlitz return error; 18065e7ae7bSOr Gerlitz } 18165e7ae7bSOr Gerlitz 18265e7ae7bSOr Gerlitz static int 1832747fdb2SMike Christie iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 1842261ec3dSMike Christie struct iscsi_task *task) 18565e7ae7bSOr Gerlitz { 18665e7ae7bSOr Gerlitz struct iscsi_data hdr; 18765e7ae7bSOr Gerlitz int error = 0; 18865e7ae7bSOr Gerlitz 18965e7ae7bSOr Gerlitz /* Send data-out PDUs while there's still unsolicited data to send */ 1902261ec3dSMike Christie while (task->unsol_count > 0) { 1912261ec3dSMike Christie iscsi_prep_unsolicit_data_pdu(task, &hdr); 19265e7ae7bSOr Gerlitz debug_scsi("Sending data-out: itt 0x%x, data count %d\n", 1932261ec3dSMike Christie hdr.itt, task->data_count); 19465e7ae7bSOr Gerlitz 19565e7ae7bSOr Gerlitz /* the buffer description has been passed with the command */ 19665e7ae7bSOr Gerlitz /* Send the command */ 1972261ec3dSMike Christie error = iser_send_data_out(conn, task, &hdr); 19865e7ae7bSOr Gerlitz if (error) { 1992261ec3dSMike Christie task->unsol_datasn--; 2002747fdb2SMike Christie goto iscsi_iser_task_xmit_unsol_data_exit; 20165e7ae7bSOr Gerlitz } 2022261ec3dSMike Christie task->unsol_count -= task->data_count; 20365e7ae7bSOr Gerlitz debug_scsi("Need to send %d more as data-out PDUs\n", 2042261ec3dSMike Christie task->unsol_count); 20565e7ae7bSOr Gerlitz } 20665e7ae7bSOr Gerlitz 2072747fdb2SMike Christie iscsi_iser_task_xmit_unsol_data_exit: 20865e7ae7bSOr Gerlitz return error; 20965e7ae7bSOr Gerlitz } 21065e7ae7bSOr Gerlitz 21165e7ae7bSOr Gerlitz static int 2122261ec3dSMike Christie iscsi_iser_task_xmit(struct iscsi_task *task) 21365e7ae7bSOr Gerlitz { 2142261ec3dSMike Christie struct iscsi_conn *conn = task->conn; 2152261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 21665e7ae7bSOr Gerlitz int error = 0; 21765e7ae7bSOr Gerlitz 2182261ec3dSMike Christie if (!task->sc) 2192261ec3dSMike Christie return iscsi_iser_mtask_xmit(conn, task); 2202747fdb2SMike Christie 2212261ec3dSMike Christie if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 2222261ec3dSMike Christie BUG_ON(scsi_bufflen(task->sc) == 0); 22377a23c21SMike Christie 22477a23c21SMike Christie debug_scsi("cmd [itt %x total %d imm %d unsol_data %d\n", 2252261ec3dSMike Christie task->itt, scsi_bufflen(task->sc), 2262261ec3dSMike Christie task->imm_count, task->unsol_count); 22777a23c21SMike Christie } 22877a23c21SMike Christie 2292261ec3dSMike Christie debug_scsi("task deq [cid %d itt 0x%x]\n", 2302261ec3dSMike Christie conn->id, task->itt); 23165e7ae7bSOr Gerlitz 23265e7ae7bSOr Gerlitz /* Send the cmd PDU */ 2332261ec3dSMike Christie if (!iser_task->command_sent) { 2342261ec3dSMike Christie error = iser_send_command(conn, task); 23565e7ae7bSOr Gerlitz if (error) 2362747fdb2SMike Christie goto iscsi_iser_task_xmit_exit; 2372261ec3dSMike Christie iser_task->command_sent = 1; 23865e7ae7bSOr Gerlitz } 23965e7ae7bSOr Gerlitz 24065e7ae7bSOr Gerlitz /* Send unsolicited data-out PDU(s) if necessary */ 2412261ec3dSMike Christie if (task->unsol_count) 2422261ec3dSMike Christie error = iscsi_iser_task_xmit_unsol_data(conn, task); 24365e7ae7bSOr Gerlitz 2442747fdb2SMike Christie iscsi_iser_task_xmit_exit: 245f0938401SErez Zilber if (error && error != -ENOBUFS) 24665e7ae7bSOr Gerlitz iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 24765e7ae7bSOr Gerlitz return error; 24865e7ae7bSOr Gerlitz } 24965e7ae7bSOr Gerlitz 25065e7ae7bSOr Gerlitz static void 2512261ec3dSMike Christie iscsi_iser_cleanup_task(struct iscsi_conn *conn, struct iscsi_task *task) 25265e7ae7bSOr Gerlitz { 2532261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 25465e7ae7bSOr Gerlitz 2552747fdb2SMike Christie /* mgmt tasks do not need special cleanup */ 2562261ec3dSMike Christie if (!task->sc) 2572747fdb2SMike Christie return; 2582747fdb2SMike Christie 2592261ec3dSMike Christie if (iser_task->status == ISER_TASK_STATUS_STARTED) { 2602261ec3dSMike Christie iser_task->status = ISER_TASK_STATUS_COMPLETED; 2612261ec3dSMike Christie iser_task_rdma_finalize(iser_task); 26265e7ae7bSOr Gerlitz } 26365e7ae7bSOr Gerlitz } 26465e7ae7bSOr Gerlitz 26565e7ae7bSOr Gerlitz static struct iscsi_cls_conn * 26665e7ae7bSOr Gerlitz iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 26765e7ae7bSOr Gerlitz { 26865e7ae7bSOr Gerlitz struct iscsi_conn *conn; 26965e7ae7bSOr Gerlitz struct iscsi_cls_conn *cls_conn; 27065e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn; 27165e7ae7bSOr Gerlitz 2725d91e209SMike Christie cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); 27365e7ae7bSOr Gerlitz if (!cls_conn) 27465e7ae7bSOr Gerlitz return NULL; 27565e7ae7bSOr Gerlitz conn = cls_conn->dd_data; 27665e7ae7bSOr Gerlitz 27765e7ae7bSOr Gerlitz /* 27865e7ae7bSOr Gerlitz * due to issues with the login code re iser sematics 27965e7ae7bSOr Gerlitz * this not set in iscsi_conn_setup - FIXME 28065e7ae7bSOr Gerlitz */ 28165e7ae7bSOr Gerlitz conn->max_recv_dlength = 128; 28265e7ae7bSOr Gerlitz 2835d91e209SMike Christie iser_conn = conn->dd_data; 28465e7ae7bSOr Gerlitz /* currently this is the only field which need to be initiated */ 28565e7ae7bSOr Gerlitz rwlock_init(&iser_conn->lock); 28665e7ae7bSOr Gerlitz 28765e7ae7bSOr Gerlitz conn->dd_data = iser_conn; 28865e7ae7bSOr Gerlitz iser_conn->iscsi_conn = conn; 28965e7ae7bSOr Gerlitz 29065e7ae7bSOr Gerlitz return cls_conn; 29165e7ae7bSOr Gerlitz } 29265e7ae7bSOr Gerlitz 29365e7ae7bSOr Gerlitz static void 29465e7ae7bSOr Gerlitz iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) 29565e7ae7bSOr Gerlitz { 29665e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 29765e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn = conn->dd_data; 298b40977d9SMike Christie struct iser_conn *ib_conn = iser_conn->ib_conn; 29965e7ae7bSOr Gerlitz 3005d91e209SMike Christie iscsi_conn_teardown(cls_conn); 301b40977d9SMike Christie /* 302b40977d9SMike Christie * Userspace will normally call the stop callback and 303b40977d9SMike Christie * already have freed the ib_conn, but if it goofed up then 304b40977d9SMike Christie * we free it here. 305b40977d9SMike Christie */ 306b40977d9SMike Christie if (ib_conn) { 307b40977d9SMike Christie ib_conn->iser_conn = NULL; 308b40977d9SMike Christie iser_conn_put(ib_conn); 309b40977d9SMike Christie } 31065e7ae7bSOr Gerlitz } 31165e7ae7bSOr Gerlitz 31265e7ae7bSOr Gerlitz static int 31365e7ae7bSOr Gerlitz iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 31465e7ae7bSOr Gerlitz struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, 31565e7ae7bSOr Gerlitz int is_leading) 31665e7ae7bSOr Gerlitz { 31765e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 31865e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn; 31965e7ae7bSOr Gerlitz struct iser_conn *ib_conn; 320412eeafaSMike Christie struct iscsi_endpoint *ep; 32165e7ae7bSOr Gerlitz int error; 32265e7ae7bSOr Gerlitz 32365e7ae7bSOr Gerlitz error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 32465e7ae7bSOr Gerlitz if (error) 32565e7ae7bSOr Gerlitz return error; 32665e7ae7bSOr Gerlitz 32765e7ae7bSOr Gerlitz /* the transport ep handle comes from user space so it must be 32865e7ae7bSOr Gerlitz * verified against the global ib connections list */ 329412eeafaSMike Christie ep = iscsi_lookup_endpoint(transport_eph); 330412eeafaSMike Christie if (!ep) { 33165e7ae7bSOr Gerlitz iser_err("can't bind eph %llx\n", 33265e7ae7bSOr Gerlitz (unsigned long long)transport_eph); 33365e7ae7bSOr Gerlitz return -EINVAL; 33465e7ae7bSOr Gerlitz } 335412eeafaSMike Christie ib_conn = ep->dd_data; 336412eeafaSMike Christie 33765e7ae7bSOr Gerlitz /* binds the iSER connection retrieved from the previously 33865e7ae7bSOr Gerlitz * connected ep_handle to the iSCSI layer connection. exchanges 33965e7ae7bSOr Gerlitz * connection pointers */ 34065e7ae7bSOr Gerlitz iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn); 34165e7ae7bSOr Gerlitz iser_conn = conn->dd_data; 34265e7ae7bSOr Gerlitz ib_conn->iser_conn = iser_conn; 34365e7ae7bSOr Gerlitz iser_conn->ib_conn = ib_conn; 344b40977d9SMike Christie iser_conn_get(ib_conn); 34565e7ae7bSOr Gerlitz 34665e7ae7bSOr Gerlitz conn->recv_lock = &iser_conn->lock; 34765e7ae7bSOr Gerlitz 34865e7ae7bSOr Gerlitz return 0; 34965e7ae7bSOr Gerlitz } 35065e7ae7bSOr Gerlitz 351b40977d9SMike Christie static void 352b40977d9SMike Christie iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 353b40977d9SMike Christie { 354b40977d9SMike Christie struct iscsi_conn *conn = cls_conn->dd_data; 355b40977d9SMike Christie struct iscsi_iser_conn *iser_conn = conn->dd_data; 356b40977d9SMike Christie struct iser_conn *ib_conn = iser_conn->ib_conn; 357b40977d9SMike Christie 358b40977d9SMike Christie iscsi_conn_stop(cls_conn, flag); 359b40977d9SMike Christie /* 360b40977d9SMike Christie * There is no unbind event so the stop callback 361b40977d9SMike Christie * must release the ref from the bind. 362b40977d9SMike Christie */ 363b40977d9SMike Christie iser_conn_put(ib_conn); 364b40977d9SMike Christie iser_conn->ib_conn = NULL; 365b40977d9SMike Christie } 366b40977d9SMike Christie 36765e7ae7bSOr Gerlitz static int 36865e7ae7bSOr Gerlitz iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 36965e7ae7bSOr Gerlitz { 37065e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 37165e7ae7bSOr Gerlitz int err; 37265e7ae7bSOr Gerlitz 3732e7a7426SErez Zilber err = iser_conn_set_full_featured_mode(conn); 37465e7ae7bSOr Gerlitz if (err) 37565e7ae7bSOr Gerlitz return err; 37665e7ae7bSOr Gerlitz 3772e7a7426SErez Zilber return iscsi_conn_start(cls_conn); 37865e7ae7bSOr Gerlitz } 37965e7ae7bSOr Gerlitz 38075613521SMike Christie static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 38175613521SMike Christie { 38275613521SMike Christie struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 38375613521SMike Christie 384a4804cd6SMike Christie iscsi_host_remove(shost); 385a4804cd6SMike Christie iscsi_host_free(shost); 38675613521SMike Christie } 38765e7ae7bSOr Gerlitz 38865e7ae7bSOr Gerlitz static struct iscsi_cls_session * 389412eeafaSMike Christie iscsi_iser_session_create(struct iscsi_endpoint *ep, 3901548271eSMike Christie uint16_t cmds_max, uint16_t qdepth, 39165e7ae7bSOr Gerlitz uint32_t initial_cmdsn, uint32_t *hostno) 39265e7ae7bSOr Gerlitz { 39365e7ae7bSOr Gerlitz struct iscsi_cls_session *cls_session; 39465e7ae7bSOr Gerlitz struct iscsi_session *session; 395412eeafaSMike Christie struct Scsi_Host *shost; 39665e7ae7bSOr Gerlitz int i; 3972261ec3dSMike Christie struct iscsi_task *task; 3982261ec3dSMike Christie struct iscsi_iser_task *iser_task; 399412eeafaSMike Christie struct iser_conn *ib_conn; 40075613521SMike Christie 401a4804cd6SMike Christie shost = iscsi_host_alloc(&iscsi_iser_sht, 0, ISCSI_MAX_CMD_PER_LUN); 40275613521SMike Christie if (!shost) 40375613521SMike Christie return NULL; 40475613521SMike Christie shost->transportt = iscsi_iser_scsi_transport; 40575613521SMike Christie shost->max_lun = iscsi_max_lun; 40675613521SMike Christie shost->max_id = 0; 40775613521SMike Christie shost->max_channel = 0; 40875613521SMike Christie shost->max_cmd_len = 16; 40975613521SMike Christie 410412eeafaSMike Christie /* 411412eeafaSMike Christie * older userspace tools (before 2.0-870) did not pass us 412412eeafaSMike Christie * the leading conn's ep so this will be NULL; 413412eeafaSMike Christie */ 414412eeafaSMike Christie if (ep) 415412eeafaSMike Christie ib_conn = ep->dd_data; 416412eeafaSMike Christie 417412eeafaSMike Christie if (iscsi_host_add(shost, 418412eeafaSMike Christie ep ? ib_conn->device->ib_device->dma_device : NULL)) 41975613521SMike Christie goto free_host; 42075613521SMike Christie *hostno = shost->host_no; 42175613521SMike Christie 4221548271eSMike Christie /* 4231548271eSMike Christie * we do not support setting can_queue cmd_per_lun from userspace yet 4241548271eSMike Christie * because we preallocate so many resources 4251548271eSMike Christie */ 42675613521SMike Christie cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 4271548271eSMike Christie ISCSI_DEF_XMIT_CMDS_MAX, 4282261ec3dSMike Christie sizeof(struct iscsi_iser_task), 4297970634bSMike Christie initial_cmdsn, 0); 43065e7ae7bSOr Gerlitz if (!cls_session) 43175613521SMike Christie goto remove_host; 43275613521SMike Christie session = cls_session->dd_data; 43365e7ae7bSOr Gerlitz 4342747fdb2SMike Christie shost->can_queue = session->scsi_cmds_max; 43565e7ae7bSOr Gerlitz /* libiscsi setup itts, data and pool so just set desc fields */ 43665e7ae7bSOr Gerlitz for (i = 0; i < session->cmds_max; i++) { 4372261ec3dSMike Christie task = session->cmds[i]; 4382261ec3dSMike Christie iser_task = task->dd_data; 4392261ec3dSMike Christie task->hdr = (struct iscsi_cmd *)&iser_task->desc.iscsi_header; 4402261ec3dSMike Christie task->hdr_max = sizeof(iser_task->desc.iscsi_header); 44165e7ae7bSOr Gerlitz } 44265e7ae7bSOr Gerlitz return cls_session; 44375613521SMike Christie 44475613521SMike Christie remove_host: 445a4804cd6SMike Christie iscsi_host_remove(shost); 44675613521SMike Christie free_host: 447a4804cd6SMike Christie iscsi_host_free(shost); 44875613521SMike Christie return NULL; 44965e7ae7bSOr Gerlitz } 45065e7ae7bSOr Gerlitz 45165e7ae7bSOr Gerlitz static int 452358ff019SMike Christie iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 453358ff019SMike Christie enum iscsi_param param, char *buf, int buflen) 45465e7ae7bSOr Gerlitz { 455358ff019SMike Christie int value; 45665e7ae7bSOr Gerlitz 45765e7ae7bSOr Gerlitz switch (param) { 45865e7ae7bSOr Gerlitz case ISCSI_PARAM_MAX_RECV_DLENGTH: 45965e7ae7bSOr Gerlitz /* TBD */ 46065e7ae7bSOr Gerlitz break; 46165e7ae7bSOr Gerlitz case ISCSI_PARAM_HDRDGST_EN: 462358ff019SMike Christie sscanf(buf, "%d", &value); 46365e7ae7bSOr Gerlitz if (value) { 46465e7ae7bSOr Gerlitz printk(KERN_ERR "DataDigest wasn't negotiated to None"); 46565e7ae7bSOr Gerlitz return -EPROTO; 46665e7ae7bSOr Gerlitz } 46765e7ae7bSOr Gerlitz break; 46865e7ae7bSOr Gerlitz case ISCSI_PARAM_DATADGST_EN: 469358ff019SMike Christie sscanf(buf, "%d", &value); 47065e7ae7bSOr Gerlitz if (value) { 47165e7ae7bSOr Gerlitz printk(KERN_ERR "DataDigest wasn't negotiated to None"); 47265e7ae7bSOr Gerlitz return -EPROTO; 47365e7ae7bSOr Gerlitz } 47465e7ae7bSOr Gerlitz break; 47565e7ae7bSOr Gerlitz case ISCSI_PARAM_IFMARKER_EN: 476358ff019SMike Christie sscanf(buf, "%d", &value); 47765e7ae7bSOr Gerlitz if (value) { 47865e7ae7bSOr Gerlitz printk(KERN_ERR "IFMarker wasn't negotiated to No"); 47965e7ae7bSOr Gerlitz return -EPROTO; 48065e7ae7bSOr Gerlitz } 48165e7ae7bSOr Gerlitz break; 48265e7ae7bSOr Gerlitz case ISCSI_PARAM_OFMARKER_EN: 483358ff019SMike Christie sscanf(buf, "%d", &value); 48465e7ae7bSOr Gerlitz if (value) { 48565e7ae7bSOr Gerlitz printk(KERN_ERR "OFMarker wasn't negotiated to No"); 48665e7ae7bSOr Gerlitz return -EPROTO; 48765e7ae7bSOr Gerlitz } 48865e7ae7bSOr Gerlitz break; 48965e7ae7bSOr Gerlitz default: 490358ff019SMike Christie return iscsi_set_param(cls_conn, param, buf, buflen); 49165e7ae7bSOr Gerlitz } 49265e7ae7bSOr Gerlitz 49365e7ae7bSOr Gerlitz return 0; 49465e7ae7bSOr Gerlitz } 49565e7ae7bSOr Gerlitz 49665e7ae7bSOr Gerlitz static void 49765e7ae7bSOr Gerlitz iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 49865e7ae7bSOr Gerlitz { 49965e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 50065e7ae7bSOr Gerlitz 50165e7ae7bSOr Gerlitz stats->txdata_octets = conn->txdata_octets; 50265e7ae7bSOr Gerlitz stats->rxdata_octets = conn->rxdata_octets; 50365e7ae7bSOr Gerlitz stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 50465e7ae7bSOr Gerlitz stats->dataout_pdus = conn->dataout_pdus_cnt; 50565e7ae7bSOr Gerlitz stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 50665e7ae7bSOr Gerlitz stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 50765e7ae7bSOr Gerlitz stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 50865e7ae7bSOr Gerlitz stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 50965e7ae7bSOr Gerlitz stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 51087528227SEli Dorfman stats->custom_length = 4; 51165e7ae7bSOr Gerlitz strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 51265e7ae7bSOr Gerlitz stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 51365e7ae7bSOr Gerlitz strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 51465e7ae7bSOr Gerlitz stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 51565e7ae7bSOr Gerlitz strcpy(stats->custom[2].desc, "eh_abort_cnt"); 51665e7ae7bSOr Gerlitz stats->custom[2].value = conn->eh_abort_cnt; 51787528227SEli Dorfman strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 51887528227SEli Dorfman stats->custom[3].value = conn->fmr_unalign_cnt; 51965e7ae7bSOr Gerlitz } 52065e7ae7bSOr Gerlitz 521412eeafaSMike Christie static struct iscsi_endpoint * 522412eeafaSMike Christie iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking) 52365e7ae7bSOr Gerlitz { 52465e7ae7bSOr Gerlitz int err; 52565e7ae7bSOr Gerlitz struct iser_conn *ib_conn; 526412eeafaSMike Christie struct iscsi_endpoint *ep; 52765e7ae7bSOr Gerlitz 528412eeafaSMike Christie ep = iscsi_create_endpoint(sizeof(*ib_conn)); 529412eeafaSMike Christie if (!ep) 530412eeafaSMike Christie return ERR_PTR(-ENOMEM); 53165e7ae7bSOr Gerlitz 532412eeafaSMike Christie ib_conn = ep->dd_data; 533412eeafaSMike Christie ib_conn->ep = ep; 534412eeafaSMike Christie iser_conn_init(ib_conn); 53565e7ae7bSOr Gerlitz 536412eeafaSMike Christie err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, 537412eeafaSMike Christie non_blocking); 538412eeafaSMike Christie if (err) { 539412eeafaSMike Christie iscsi_destroy_endpoint(ep); 540412eeafaSMike Christie return ERR_PTR(err); 541412eeafaSMike Christie } 542412eeafaSMike Christie return ep; 54365e7ae7bSOr Gerlitz } 54465e7ae7bSOr Gerlitz 54565e7ae7bSOr Gerlitz static int 546412eeafaSMike Christie iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 54765e7ae7bSOr Gerlitz { 548412eeafaSMike Christie struct iser_conn *ib_conn; 54965e7ae7bSOr Gerlitz int rc; 55065e7ae7bSOr Gerlitz 551412eeafaSMike Christie ib_conn = ep->dd_data; 55265e7ae7bSOr Gerlitz rc = wait_event_interruptible_timeout(ib_conn->wait, 55365e7ae7bSOr Gerlitz ib_conn->state == ISER_CONN_UP, 55465e7ae7bSOr Gerlitz msecs_to_jiffies(timeout_ms)); 55565e7ae7bSOr Gerlitz 55665e7ae7bSOr Gerlitz /* if conn establishment failed, return error code to iscsi */ 55765e7ae7bSOr Gerlitz if (!rc && 55865e7ae7bSOr Gerlitz (ib_conn->state == ISER_CONN_TERMINATING || 55965e7ae7bSOr Gerlitz ib_conn->state == ISER_CONN_DOWN)) 56065e7ae7bSOr Gerlitz rc = -1; 56165e7ae7bSOr Gerlitz 56265e7ae7bSOr Gerlitz iser_err("ib conn %p rc = %d\n", ib_conn, rc); 56365e7ae7bSOr Gerlitz 56465e7ae7bSOr Gerlitz if (rc > 0) 56565e7ae7bSOr Gerlitz return 1; /* success, this is the equivalent of POLLOUT */ 56665e7ae7bSOr Gerlitz else if (!rc) 56765e7ae7bSOr Gerlitz return 0; /* timeout */ 56865e7ae7bSOr Gerlitz else 56965e7ae7bSOr Gerlitz return rc; /* signal */ 57065e7ae7bSOr Gerlitz } 57165e7ae7bSOr Gerlitz 57265e7ae7bSOr Gerlitz static void 573412eeafaSMike Christie iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 57465e7ae7bSOr Gerlitz { 5751c83469dSMike Christie struct iser_conn *ib_conn; 57665e7ae7bSOr Gerlitz 577412eeafaSMike Christie ib_conn = ep->dd_data; 578b40977d9SMike Christie if (ib_conn->iser_conn) 579b40977d9SMike Christie /* 580b40977d9SMike Christie * Must suspend xmit path if the ep is bound to the 581b40977d9SMike Christie * iscsi_conn, so we know we are not accessing the ib_conn 582b40977d9SMike Christie * when we free it. 583b40977d9SMike Christie * 584b40977d9SMike Christie * This may not be bound if the ep poll failed. 585b40977d9SMike Christie */ 586b40977d9SMike Christie iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); 587b40977d9SMike Christie 588b40977d9SMike Christie 58965e7ae7bSOr Gerlitz iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); 59065e7ae7bSOr Gerlitz iser_conn_terminate(ib_conn); 59165e7ae7bSOr Gerlitz } 59265e7ae7bSOr Gerlitz 59365e7ae7bSOr Gerlitz static struct scsi_host_template iscsi_iser_sht = { 5947974392cSMike Christie .module = THIS_MODULE, 59565e7ae7bSOr Gerlitz .name = "iSCSI Initiator over iSER, v." DRV_VER, 59665e7ae7bSOr Gerlitz .queuecommand = iscsi_queuecommand, 5976410627eSErez Zilber .change_queue_depth = iscsi_change_queue_depth, 5981548271eSMike Christie .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, 59965e7ae7bSOr Gerlitz .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 6008072ec2fSErez Zilber .max_sectors = 1024, 60165e7ae7bSOr Gerlitz .cmd_per_lun = ISCSI_MAX_CMD_PER_LUN, 60265e7ae7bSOr Gerlitz .eh_abort_handler = iscsi_eh_abort, 60390c18f3cSErez Zilber .eh_device_reset_handler= iscsi_eh_device_reset, 60465e7ae7bSOr Gerlitz .eh_host_reset_handler = iscsi_eh_host_reset, 60565e7ae7bSOr Gerlitz .use_clustering = DISABLE_CLUSTERING, 60665e7ae7bSOr Gerlitz .proc_name = "iscsi_iser", 60765e7ae7bSOr Gerlitz .this_id = -1, 60865e7ae7bSOr Gerlitz }; 60965e7ae7bSOr Gerlitz 61065e7ae7bSOr Gerlitz static struct iscsi_transport iscsi_iser_transport = { 61165e7ae7bSOr Gerlitz .owner = THIS_MODULE, 61265e7ae7bSOr Gerlitz .name = "iser", 61365e7ae7bSOr Gerlitz .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, 61465e7ae7bSOr Gerlitz .param_mask = ISCSI_MAX_RECV_DLENGTH | 61565e7ae7bSOr Gerlitz ISCSI_MAX_XMIT_DLENGTH | 61665e7ae7bSOr Gerlitz ISCSI_HDRDGST_EN | 61765e7ae7bSOr Gerlitz ISCSI_DATADGST_EN | 61865e7ae7bSOr Gerlitz ISCSI_INITIAL_R2T_EN | 61965e7ae7bSOr Gerlitz ISCSI_MAX_R2T | 62065e7ae7bSOr Gerlitz ISCSI_IMM_DATA_EN | 62165e7ae7bSOr Gerlitz ISCSI_FIRST_BURST | 62265e7ae7bSOr Gerlitz ISCSI_MAX_BURST | 62365e7ae7bSOr Gerlitz ISCSI_PDU_INORDER_EN | 624358ff019SMike Christie ISCSI_DATASEQ_INORDER_EN | 625358ff019SMike Christie ISCSI_EXP_STATSN | 626358ff019SMike Christie ISCSI_PERSISTENT_PORT | 627358ff019SMike Christie ISCSI_PERSISTENT_ADDRESS | 628b2c64167SMike Christie ISCSI_TARGET_NAME | ISCSI_TPGT | 629b2c64167SMike Christie ISCSI_USERNAME | ISCSI_PASSWORD | 630f6d5180cSMike Christie ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | 631f6d5180cSMike Christie ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | 63288dfd340SMike Christie ISCSI_PING_TMO | ISCSI_RECV_TMO | 63388dfd340SMike Christie ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, 6348ad5781aSMike Christie .host_param_mask = ISCSI_HOST_HWADDRESS | 635d8196ed2SMike Christie ISCSI_HOST_NETDEV_NAME | 6368ad5781aSMike Christie ISCSI_HOST_INITIATOR_NAME, 63765e7ae7bSOr Gerlitz /* session management */ 63865e7ae7bSOr Gerlitz .create_session = iscsi_iser_session_create, 63975613521SMike Christie .destroy_session = iscsi_iser_session_destroy, 64065e7ae7bSOr Gerlitz /* connection management */ 64165e7ae7bSOr Gerlitz .create_conn = iscsi_iser_conn_create, 64265e7ae7bSOr Gerlitz .bind_conn = iscsi_iser_conn_bind, 64365e7ae7bSOr Gerlitz .destroy_conn = iscsi_iser_conn_destroy, 644358ff019SMike Christie .set_param = iscsi_iser_set_param, 645358ff019SMike Christie .get_conn_param = iscsi_conn_get_param, 646358ff019SMike Christie .get_session_param = iscsi_session_get_param, 64765e7ae7bSOr Gerlitz .start_conn = iscsi_iser_conn_start, 648b40977d9SMike Christie .stop_conn = iscsi_iser_conn_stop, 6490801c242SMike Christie /* iscsi host params */ 6500801c242SMike Christie .get_host_param = iscsi_host_get_param, 6510801c242SMike Christie .set_host_param = iscsi_host_set_param, 65265e7ae7bSOr Gerlitz /* IO */ 65365e7ae7bSOr Gerlitz .send_pdu = iscsi_conn_send_pdu, 65465e7ae7bSOr Gerlitz .get_stats = iscsi_iser_conn_get_stats, 6552747fdb2SMike Christie .init_task = iscsi_iser_task_init, 6562747fdb2SMike Christie .xmit_task = iscsi_iser_task_xmit, 6572747fdb2SMike Christie .cleanup_task = iscsi_iser_cleanup_task, 65865e7ae7bSOr Gerlitz /* recovery */ 65965e7ae7bSOr Gerlitz .session_recovery_timedout = iscsi_session_recovery_timedout, 66065e7ae7bSOr Gerlitz 66165e7ae7bSOr Gerlitz .ep_connect = iscsi_iser_ep_connect, 66265e7ae7bSOr Gerlitz .ep_poll = iscsi_iser_ep_poll, 66365e7ae7bSOr Gerlitz .ep_disconnect = iscsi_iser_ep_disconnect 66465e7ae7bSOr Gerlitz }; 66565e7ae7bSOr Gerlitz 66665e7ae7bSOr Gerlitz static int __init iser_init(void) 66765e7ae7bSOr Gerlitz { 66865e7ae7bSOr Gerlitz int err; 66965e7ae7bSOr Gerlitz 67065e7ae7bSOr Gerlitz iser_dbg("Starting iSER datamover...\n"); 67165e7ae7bSOr Gerlitz 67265e7ae7bSOr Gerlitz if (iscsi_max_lun < 1) { 67365e7ae7bSOr Gerlitz printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); 67465e7ae7bSOr Gerlitz return -EINVAL; 67565e7ae7bSOr Gerlitz } 67665e7ae7bSOr Gerlitz 67765e7ae7bSOr Gerlitz memset(&ig, 0, sizeof(struct iser_global)); 67865e7ae7bSOr Gerlitz 67965e7ae7bSOr Gerlitz ig.desc_cache = kmem_cache_create("iser_descriptors", 68065e7ae7bSOr Gerlitz sizeof (struct iser_desc), 68165e7ae7bSOr Gerlitz 0, SLAB_HWCACHE_ALIGN, 68220c2df83SPaul Mundt NULL); 68365e7ae7bSOr Gerlitz if (ig.desc_cache == NULL) 68465e7ae7bSOr Gerlitz return -ENOMEM; 68565e7ae7bSOr Gerlitz 68665e7ae7bSOr Gerlitz /* device init is called only after the first addr resolution */ 68765e7ae7bSOr Gerlitz mutex_init(&ig.device_list_mutex); 68865e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.device_list); 68965e7ae7bSOr Gerlitz mutex_init(&ig.connlist_mutex); 69065e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.connlist); 69165e7ae7bSOr Gerlitz 69275613521SMike Christie iscsi_iser_scsi_transport = iscsi_register_transport( 69375613521SMike Christie &iscsi_iser_transport); 69475613521SMike Christie if (!iscsi_iser_scsi_transport) { 69565e7ae7bSOr Gerlitz iser_err("iscsi_register_transport failed\n"); 69665e7ae7bSOr Gerlitz err = -EINVAL; 69765e7ae7bSOr Gerlitz goto register_transport_failure; 69865e7ae7bSOr Gerlitz } 69965e7ae7bSOr Gerlitz 70065e7ae7bSOr Gerlitz return 0; 70165e7ae7bSOr Gerlitz 70265e7ae7bSOr Gerlitz register_transport_failure: 70365e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 70465e7ae7bSOr Gerlitz 70565e7ae7bSOr Gerlitz return err; 70665e7ae7bSOr Gerlitz } 70765e7ae7bSOr Gerlitz 70865e7ae7bSOr Gerlitz static void __exit iser_exit(void) 70965e7ae7bSOr Gerlitz { 71065e7ae7bSOr Gerlitz iser_dbg("Removing iSER datamover...\n"); 71165e7ae7bSOr Gerlitz iscsi_unregister_transport(&iscsi_iser_transport); 71265e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 71365e7ae7bSOr Gerlitz } 71465e7ae7bSOr Gerlitz 71565e7ae7bSOr Gerlitz module_init(iser_init); 71665e7ae7bSOr Gerlitz module_exit(iser_exit); 717