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 #include <linux/types.h> 4865e7ae7bSOr Gerlitz #include <linux/list.h> 4965e7ae7bSOr Gerlitz #include <linux/hardirq.h> 5065e7ae7bSOr Gerlitz #include <linux/kfifo.h> 5165e7ae7bSOr Gerlitz #include <linux/blkdev.h> 5265e7ae7bSOr Gerlitz #include <linux/init.h> 5365e7ae7bSOr Gerlitz #include <linux/ioctl.h> 5465e7ae7bSOr Gerlitz #include <linux/cdev.h> 5565e7ae7bSOr Gerlitz #include <linux/in.h> 5665e7ae7bSOr Gerlitz #include <linux/net.h> 5765e7ae7bSOr Gerlitz #include <linux/scatterlist.h> 5865e7ae7bSOr Gerlitz #include <linux/delay.h> 5965e7ae7bSOr Gerlitz 6065e7ae7bSOr Gerlitz #include <net/sock.h> 6165e7ae7bSOr Gerlitz 6265e7ae7bSOr Gerlitz #include <asm/uaccess.h> 6365e7ae7bSOr Gerlitz 6465e7ae7bSOr Gerlitz #include <scsi/scsi_cmnd.h> 6565e7ae7bSOr Gerlitz #include <scsi/scsi_device.h> 6665e7ae7bSOr Gerlitz #include <scsi/scsi_eh.h> 6765e7ae7bSOr Gerlitz #include <scsi/scsi_tcq.h> 6865e7ae7bSOr Gerlitz #include <scsi/scsi_host.h> 6965e7ae7bSOr Gerlitz #include <scsi/scsi.h> 7065e7ae7bSOr Gerlitz #include <scsi/scsi_transport_iscsi.h> 7165e7ae7bSOr Gerlitz 7265e7ae7bSOr Gerlitz #include "iscsi_iser.h" 7365e7ae7bSOr Gerlitz 7475613521SMike Christie static struct scsi_host_template iscsi_iser_sht; 7575613521SMike Christie static struct iscsi_transport iscsi_iser_transport; 7675613521SMike Christie static struct scsi_transport_template *iscsi_iser_scsi_transport; 7775613521SMike Christie 7865e7ae7bSOr Gerlitz static unsigned int iscsi_max_lun = 512; 7965e7ae7bSOr Gerlitz module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); 8065e7ae7bSOr Gerlitz 8165e7ae7bSOr Gerlitz int iser_debug_level = 0; 8265e7ae7bSOr Gerlitz 8365e7ae7bSOr Gerlitz MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover " 8465e7ae7bSOr Gerlitz "v" DRV_VER " (" DRV_DATE ")"); 8565e7ae7bSOr Gerlitz MODULE_LICENSE("Dual BSD/GPL"); 8665e7ae7bSOr Gerlitz MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); 8765e7ae7bSOr Gerlitz 8865e7ae7bSOr Gerlitz module_param_named(debug_level, iser_debug_level, int, 0644); 8965e7ae7bSOr Gerlitz MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); 9065e7ae7bSOr Gerlitz 9165e7ae7bSOr Gerlitz struct iser_global ig; 9265e7ae7bSOr Gerlitz 9365e7ae7bSOr Gerlitz void 9465e7ae7bSOr Gerlitz iscsi_iser_recv(struct iscsi_conn *conn, 9565e7ae7bSOr Gerlitz struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) 9665e7ae7bSOr Gerlitz { 9765e7ae7bSOr Gerlitz int rc = 0; 9865e7ae7bSOr Gerlitz int datalen; 9965e7ae7bSOr Gerlitz int ahslen; 10065e7ae7bSOr Gerlitz 10165e7ae7bSOr Gerlitz /* verify PDU length */ 10265e7ae7bSOr Gerlitz datalen = ntoh24(hdr->dlength); 10365e7ae7bSOr Gerlitz if (datalen != rx_data_len) { 10465e7ae7bSOr Gerlitz printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n", 10565e7ae7bSOr Gerlitz datalen, rx_data_len); 10665e7ae7bSOr Gerlitz rc = ISCSI_ERR_DATALEN; 10765e7ae7bSOr Gerlitz goto error; 10865e7ae7bSOr Gerlitz } 10965e7ae7bSOr Gerlitz 11065e7ae7bSOr Gerlitz /* read AHS */ 11165e7ae7bSOr Gerlitz ahslen = hdr->hlength * 4; 11265e7ae7bSOr Gerlitz 11365e7ae7bSOr Gerlitz rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 11465e7ae7bSOr Gerlitz if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 11565e7ae7bSOr Gerlitz goto error; 11665e7ae7bSOr Gerlitz 11765e7ae7bSOr Gerlitz return; 11865e7ae7bSOr Gerlitz error: 11965e7ae7bSOr Gerlitz iscsi_conn_failure(conn, rc); 12065e7ae7bSOr Gerlitz } 12165e7ae7bSOr Gerlitz 1222ff79d52SMike Christie static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) 1230f9c7449SMike Christie { 1240f9c7449SMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 1250f9c7449SMike Christie 1260f9c7449SMike Christie task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; 1270f9c7449SMike Christie task->hdr_max = sizeof(iser_task->desc.iscsi_header); 1280f9c7449SMike Christie return 0; 1290f9c7449SMike Christie } 13065e7ae7bSOr Gerlitz 13165e7ae7bSOr Gerlitz /** 1322261ec3dSMike Christie * iscsi_iser_task_init - Initialize task 1332261ec3dSMike Christie * @task: iscsi task 13465e7ae7bSOr Gerlitz * 1352261ec3dSMike Christie * Initialize the task for the scsi command or mgmt command. 1362747fdb2SMike Christie */ 137a8ac6311SOlaf Kirch static int 1382261ec3dSMike Christie iscsi_iser_task_init(struct iscsi_task *task) 13965e7ae7bSOr Gerlitz { 1402261ec3dSMike Christie struct iscsi_iser_conn *iser_conn = task->conn->dd_data; 1412261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 14265e7ae7bSOr Gerlitz 1432261ec3dSMike Christie /* mgmt task */ 1442261ec3dSMike Christie if (!task->sc) { 1452261ec3dSMike Christie iser_task->desc.data = task->data; 1462747fdb2SMike Christie return 0; 1472747fdb2SMike Christie } 1482747fdb2SMike Christie 1492261ec3dSMike Christie iser_task->command_sent = 0; 1502261ec3dSMike Christie iser_task->iser_conn = iser_conn; 1512261ec3dSMike Christie iser_task_rdma_init(iser_task); 152a8ac6311SOlaf Kirch return 0; 15365e7ae7bSOr Gerlitz } 15465e7ae7bSOr Gerlitz 15565e7ae7bSOr Gerlitz /** 1562261ec3dSMike Christie * iscsi_iser_mtask_xmit - xmit management(immediate) task 15765e7ae7bSOr Gerlitz * @conn: iscsi connection 1582261ec3dSMike Christie * @task: task management task 15965e7ae7bSOr Gerlitz * 16065e7ae7bSOr Gerlitz * Notes: 16165e7ae7bSOr Gerlitz * The function can return -EAGAIN in which case caller must 16265e7ae7bSOr Gerlitz * call it again later, or recover. '0' return code means successful 16365e7ae7bSOr Gerlitz * xmit. 16465e7ae7bSOr Gerlitz * 16565e7ae7bSOr Gerlitz **/ 16665e7ae7bSOr Gerlitz static int 1672261ec3dSMike Christie iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 16865e7ae7bSOr Gerlitz { 16965e7ae7bSOr Gerlitz int error = 0; 17065e7ae7bSOr Gerlitz 1712261ec3dSMike Christie debug_scsi("task deq [cid %d itt 0x%x]\n", conn->id, task->itt); 17265e7ae7bSOr Gerlitz 1732261ec3dSMike Christie error = iser_send_control(conn, task); 17465e7ae7bSOr Gerlitz 1752261ec3dSMike Christie /* since iser xmits control with zero copy, tasks can not be recycled 17665e7ae7bSOr Gerlitz * right after sending them. 17765e7ae7bSOr Gerlitz * The recycling scheme is based on whether a response is expected 1782261ec3dSMike Christie * - if yes, the task is recycled at iscsi_complete_pdu 1792261ec3dSMike Christie * - if no, the task is recycled at iser_snd_completion 18065e7ae7bSOr Gerlitz */ 181f0938401SErez Zilber if (error && error != -ENOBUFS) 18265e7ae7bSOr Gerlitz iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 18365e7ae7bSOr Gerlitz 18465e7ae7bSOr Gerlitz return error; 18565e7ae7bSOr Gerlitz } 18665e7ae7bSOr Gerlitz 18765e7ae7bSOr Gerlitz static int 1882747fdb2SMike Christie iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 1892261ec3dSMike Christie struct iscsi_task *task) 19065e7ae7bSOr Gerlitz { 1910f9c7449SMike Christie struct iscsi_r2t_info *r2t = &task->unsol_r2t; 19265e7ae7bSOr Gerlitz struct iscsi_data hdr; 19365e7ae7bSOr Gerlitz int error = 0; 19465e7ae7bSOr Gerlitz 19565e7ae7bSOr Gerlitz /* Send data-out PDUs while there's still unsolicited data to send */ 1960f9c7449SMike Christie while (iscsi_task_has_unsol_data(task)) { 1970f9c7449SMike Christie iscsi_prep_data_out_pdu(task, r2t, &hdr); 19865e7ae7bSOr Gerlitz debug_scsi("Sending data-out: itt 0x%x, data count %d\n", 1990f9c7449SMike Christie hdr.itt, r2t->data_count); 20065e7ae7bSOr Gerlitz 20165e7ae7bSOr Gerlitz /* the buffer description has been passed with the command */ 20265e7ae7bSOr Gerlitz /* Send the command */ 2032261ec3dSMike Christie error = iser_send_data_out(conn, task, &hdr); 20465e7ae7bSOr Gerlitz if (error) { 2050f9c7449SMike Christie r2t->datasn--; 2062747fdb2SMike Christie goto iscsi_iser_task_xmit_unsol_data_exit; 20765e7ae7bSOr Gerlitz } 2080f9c7449SMike Christie r2t->sent += r2t->data_count; 20965e7ae7bSOr Gerlitz debug_scsi("Need to send %d more as data-out PDUs\n", 2100f9c7449SMike Christie r2t->data_length - r2t->sent); 21165e7ae7bSOr Gerlitz } 21265e7ae7bSOr Gerlitz 2132747fdb2SMike Christie iscsi_iser_task_xmit_unsol_data_exit: 21465e7ae7bSOr Gerlitz return error; 21565e7ae7bSOr Gerlitz } 21665e7ae7bSOr Gerlitz 21765e7ae7bSOr Gerlitz static int 2182261ec3dSMike Christie iscsi_iser_task_xmit(struct iscsi_task *task) 21965e7ae7bSOr Gerlitz { 2202261ec3dSMike Christie struct iscsi_conn *conn = task->conn; 2212261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 22265e7ae7bSOr Gerlitz int error = 0; 22365e7ae7bSOr Gerlitz 2242261ec3dSMike Christie if (!task->sc) 2252261ec3dSMike Christie return iscsi_iser_mtask_xmit(conn, task); 2262747fdb2SMike Christie 2272261ec3dSMike Christie if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 2282261ec3dSMike Christie BUG_ON(scsi_bufflen(task->sc) == 0); 22977a23c21SMike Christie 23077a23c21SMike Christie debug_scsi("cmd [itt %x total %d imm %d unsol_data %d\n", 2312261ec3dSMike Christie task->itt, scsi_bufflen(task->sc), 2320f9c7449SMike Christie task->imm_count, task->unsol_r2t.data_length); 23377a23c21SMike Christie } 23477a23c21SMike Christie 2352261ec3dSMike Christie debug_scsi("task deq [cid %d itt 0x%x]\n", 2362261ec3dSMike Christie conn->id, task->itt); 23765e7ae7bSOr Gerlitz 23865e7ae7bSOr Gerlitz /* Send the cmd PDU */ 2392261ec3dSMike Christie if (!iser_task->command_sent) { 2402261ec3dSMike Christie error = iser_send_command(conn, task); 24165e7ae7bSOr Gerlitz if (error) 2422747fdb2SMike Christie goto iscsi_iser_task_xmit_exit; 2432261ec3dSMike Christie iser_task->command_sent = 1; 24465e7ae7bSOr Gerlitz } 24565e7ae7bSOr Gerlitz 24665e7ae7bSOr Gerlitz /* Send unsolicited data-out PDU(s) if necessary */ 2470f9c7449SMike Christie if (iscsi_task_has_unsol_data(task)) 2482261ec3dSMike Christie error = iscsi_iser_task_xmit_unsol_data(conn, task); 24965e7ae7bSOr Gerlitz 2502747fdb2SMike Christie iscsi_iser_task_xmit_exit: 251f0938401SErez Zilber if (error && error != -ENOBUFS) 25265e7ae7bSOr Gerlitz iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 25365e7ae7bSOr Gerlitz return error; 25465e7ae7bSOr Gerlitz } 25565e7ae7bSOr Gerlitz 2560f9c7449SMike Christie static void iscsi_iser_cleanup_task(struct iscsi_task *task) 25765e7ae7bSOr Gerlitz { 2582261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 25965e7ae7bSOr Gerlitz 2600f9c7449SMike Christie /* 2610f9c7449SMike Christie * mgmt tasks do not need special cleanup and we do not 2620f9c7449SMike Christie * allocate anything in the init task callout 2630f9c7449SMike Christie */ 2640f9c7449SMike Christie if (!task->sc || task->state == ISCSI_TASK_PENDING) 2652747fdb2SMike Christie return; 26665e7ae7bSOr Gerlitz 2672261ec3dSMike Christie if (iser_task->status == ISER_TASK_STATUS_STARTED) { 2682261ec3dSMike Christie iser_task->status = ISER_TASK_STATUS_COMPLETED; 2692261ec3dSMike Christie iser_task_rdma_finalize(iser_task); 27065e7ae7bSOr Gerlitz } 27165e7ae7bSOr Gerlitz } 27265e7ae7bSOr Gerlitz 27365e7ae7bSOr Gerlitz static struct iscsi_cls_conn * 27465e7ae7bSOr Gerlitz iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 27565e7ae7bSOr Gerlitz { 27665e7ae7bSOr Gerlitz struct iscsi_conn *conn; 27765e7ae7bSOr Gerlitz struct iscsi_cls_conn *cls_conn; 27865e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn; 27965e7ae7bSOr Gerlitz 2805d91e209SMike Christie cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); 28165e7ae7bSOr Gerlitz if (!cls_conn) 28265e7ae7bSOr Gerlitz return NULL; 28365e7ae7bSOr Gerlitz conn = cls_conn->dd_data; 28465e7ae7bSOr Gerlitz 28565e7ae7bSOr Gerlitz /* 28665e7ae7bSOr Gerlitz * due to issues with the login code re iser sematics 28765e7ae7bSOr Gerlitz * this not set in iscsi_conn_setup - FIXME 28865e7ae7bSOr Gerlitz */ 28965e7ae7bSOr Gerlitz conn->max_recv_dlength = 128; 29065e7ae7bSOr Gerlitz 2915d91e209SMike Christie iser_conn = conn->dd_data; 29265e7ae7bSOr Gerlitz conn->dd_data = iser_conn; 29365e7ae7bSOr Gerlitz iser_conn->iscsi_conn = conn; 29465e7ae7bSOr Gerlitz 29565e7ae7bSOr Gerlitz return cls_conn; 29665e7ae7bSOr Gerlitz } 29765e7ae7bSOr Gerlitz 29865e7ae7bSOr Gerlitz static void 29965e7ae7bSOr Gerlitz iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) 30065e7ae7bSOr Gerlitz { 30165e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 30265e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn = conn->dd_data; 303b40977d9SMike Christie struct iser_conn *ib_conn = iser_conn->ib_conn; 30465e7ae7bSOr Gerlitz 30565e7ae7bSOr Gerlitz iscsi_conn_teardown(cls_conn); 306b40977d9SMike Christie /* 307b40977d9SMike Christie * Userspace will normally call the stop callback and 308b40977d9SMike Christie * already have freed the ib_conn, but if it goofed up then 309b40977d9SMike Christie * we free it here. 310b40977d9SMike Christie */ 311b40977d9SMike Christie if (ib_conn) { 312b40977d9SMike Christie ib_conn->iser_conn = NULL; 313b40977d9SMike Christie iser_conn_put(ib_conn); 314b40977d9SMike Christie } 31565e7ae7bSOr Gerlitz } 31665e7ae7bSOr Gerlitz 31765e7ae7bSOr Gerlitz static int 31865e7ae7bSOr Gerlitz iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 31965e7ae7bSOr Gerlitz struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, 32065e7ae7bSOr Gerlitz int is_leading) 32165e7ae7bSOr Gerlitz { 32265e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 32365e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn; 32465e7ae7bSOr Gerlitz struct iser_conn *ib_conn; 325412eeafaSMike Christie struct iscsi_endpoint *ep; 32665e7ae7bSOr Gerlitz int error; 32765e7ae7bSOr Gerlitz 32865e7ae7bSOr Gerlitz error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 32965e7ae7bSOr Gerlitz if (error) 33065e7ae7bSOr Gerlitz return error; 33165e7ae7bSOr Gerlitz 33265e7ae7bSOr Gerlitz /* the transport ep handle comes from user space so it must be 33365e7ae7bSOr Gerlitz * verified against the global ib connections list */ 334412eeafaSMike Christie ep = iscsi_lookup_endpoint(transport_eph); 335412eeafaSMike Christie if (!ep) { 33665e7ae7bSOr Gerlitz iser_err("can't bind eph %llx\n", 33765e7ae7bSOr Gerlitz (unsigned long long)transport_eph); 33865e7ae7bSOr Gerlitz return -EINVAL; 33965e7ae7bSOr Gerlitz } 340412eeafaSMike Christie ib_conn = ep->dd_data; 341412eeafaSMike Christie 34265e7ae7bSOr Gerlitz /* binds the iSER connection retrieved from the previously 34365e7ae7bSOr Gerlitz * connected ep_handle to the iSCSI layer connection. exchanges 34465e7ae7bSOr Gerlitz * connection pointers */ 34565e7ae7bSOr Gerlitz iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn); 34665e7ae7bSOr Gerlitz iser_conn = conn->dd_data; 34765e7ae7bSOr Gerlitz ib_conn->iser_conn = iser_conn; 34865e7ae7bSOr Gerlitz iser_conn->ib_conn = ib_conn; 349b40977d9SMike Christie iser_conn_get(ib_conn); 35065e7ae7bSOr Gerlitz return 0; 35165e7ae7bSOr Gerlitz } 35265e7ae7bSOr Gerlitz 353b40977d9SMike Christie static void 354b40977d9SMike Christie iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 355b40977d9SMike Christie { 356b40977d9SMike Christie struct iscsi_conn *conn = cls_conn->dd_data; 357b40977d9SMike Christie struct iscsi_iser_conn *iser_conn = conn->dd_data; 358b40977d9SMike Christie struct iser_conn *ib_conn = iser_conn->ib_conn; 359b40977d9SMike Christie 360913e5bf4SMike Christie /* 361913e5bf4SMike Christie * Userspace may have goofed up and not bound the connection or 362913e5bf4SMike Christie * might have only partially setup the connection. 363913e5bf4SMike Christie */ 364913e5bf4SMike Christie if (ib_conn) { 365b40977d9SMike Christie iscsi_conn_stop(cls_conn, flag); 366b40977d9SMike Christie /* 367b40977d9SMike Christie * There is no unbind event so the stop callback 368b40977d9SMike Christie * must release the ref from the bind. 369b40977d9SMike Christie */ 370b40977d9SMike Christie iser_conn_put(ib_conn); 371913e5bf4SMike Christie } 372b40977d9SMike Christie iser_conn->ib_conn = NULL; 373b40977d9SMike Christie } 374b40977d9SMike Christie 37565e7ae7bSOr Gerlitz static int 37665e7ae7bSOr Gerlitz iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 37765e7ae7bSOr Gerlitz { 37865e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 37965e7ae7bSOr Gerlitz int err; 38065e7ae7bSOr Gerlitz 3812e7a7426SErez Zilber err = iser_conn_set_full_featured_mode(conn); 38265e7ae7bSOr Gerlitz if (err) 38365e7ae7bSOr Gerlitz return err; 38465e7ae7bSOr Gerlitz 3852e7a7426SErez Zilber return iscsi_conn_start(cls_conn); 38665e7ae7bSOr Gerlitz } 38765e7ae7bSOr Gerlitz 38875613521SMike Christie static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 38975613521SMike Christie { 39075613521SMike Christie struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 39175613521SMike Christie 392e5bd7b54SMike Christie iscsi_session_teardown(cls_session); 393a4804cd6SMike Christie iscsi_host_remove(shost); 394a4804cd6SMike Christie iscsi_host_free(shost); 39575613521SMike Christie } 39665e7ae7bSOr Gerlitz 39765e7ae7bSOr Gerlitz static struct iscsi_cls_session * 398412eeafaSMike Christie iscsi_iser_session_create(struct iscsi_endpoint *ep, 3991548271eSMike Christie uint16_t cmds_max, uint16_t qdepth, 40065e7ae7bSOr Gerlitz uint32_t initial_cmdsn, uint32_t *hostno) 40165e7ae7bSOr Gerlitz { 40265e7ae7bSOr Gerlitz struct iscsi_cls_session *cls_session; 40365e7ae7bSOr Gerlitz struct iscsi_session *session; 404412eeafaSMike Christie struct Scsi_Host *shost; 405412eeafaSMike Christie struct iser_conn *ib_conn; 40675613521SMike Christie 407a4804cd6SMike Christie shost = iscsi_host_alloc(&iscsi_iser_sht, 0, ISCSI_MAX_CMD_PER_LUN); 40875613521SMike Christie if (!shost) 40975613521SMike Christie return NULL; 41075613521SMike Christie shost->transportt = iscsi_iser_scsi_transport; 41175613521SMike Christie shost->max_lun = iscsi_max_lun; 41275613521SMike Christie shost->max_id = 0; 41375613521SMike Christie shost->max_channel = 0; 41475613521SMike Christie shost->max_cmd_len = 16; 41575613521SMike Christie 416412eeafaSMike Christie /* 417412eeafaSMike Christie * older userspace tools (before 2.0-870) did not pass us 418412eeafaSMike Christie * the leading conn's ep so this will be NULL; 419412eeafaSMike Christie */ 420412eeafaSMike Christie if (ep) 421412eeafaSMike Christie ib_conn = ep->dd_data; 422412eeafaSMike Christie 423412eeafaSMike Christie if (iscsi_host_add(shost, 424412eeafaSMike Christie ep ? ib_conn->device->ib_device->dma_device : NULL)) 42575613521SMike Christie goto free_host; 42675613521SMike Christie *hostno = shost->host_no; 42765e7ae7bSOr Gerlitz 4281548271eSMike Christie /* 4291548271eSMike Christie * we do not support setting can_queue cmd_per_lun from userspace yet 4301548271eSMike Christie * because we preallocate so many resources 4311548271eSMike Christie */ 43275613521SMike Christie cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 4331548271eSMike Christie ISCSI_DEF_XMIT_CMDS_MAX, 4342261ec3dSMike Christie sizeof(struct iscsi_iser_task), 4357970634bSMike Christie initial_cmdsn, 0); 43665e7ae7bSOr Gerlitz if (!cls_session) 43775613521SMike Christie goto remove_host; 43875613521SMike Christie session = cls_session->dd_data; 43965e7ae7bSOr Gerlitz 4402747fdb2SMike Christie shost->can_queue = session->scsi_cmds_max; 44165e7ae7bSOr Gerlitz return cls_session; 44275613521SMike Christie 44375613521SMike Christie remove_host: 444a4804cd6SMike Christie iscsi_host_remove(shost); 44575613521SMike Christie free_host: 446a4804cd6SMike Christie iscsi_host_free(shost); 44775613521SMike Christie return NULL; 44865e7ae7bSOr Gerlitz } 44965e7ae7bSOr Gerlitz 45065e7ae7bSOr Gerlitz static int 451358ff019SMike Christie iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 452358ff019SMike Christie enum iscsi_param param, char *buf, int buflen) 45365e7ae7bSOr Gerlitz { 454358ff019SMike Christie int value; 45565e7ae7bSOr Gerlitz 45665e7ae7bSOr Gerlitz switch (param) { 45765e7ae7bSOr Gerlitz case ISCSI_PARAM_MAX_RECV_DLENGTH: 45865e7ae7bSOr Gerlitz /* TBD */ 45965e7ae7bSOr Gerlitz break; 46065e7ae7bSOr Gerlitz case ISCSI_PARAM_HDRDGST_EN: 461358ff019SMike Christie sscanf(buf, "%d", &value); 46265e7ae7bSOr Gerlitz if (value) { 46365e7ae7bSOr Gerlitz printk(KERN_ERR "DataDigest wasn't negotiated to None"); 46465e7ae7bSOr Gerlitz return -EPROTO; 46565e7ae7bSOr Gerlitz } 46665e7ae7bSOr Gerlitz break; 46765e7ae7bSOr Gerlitz case ISCSI_PARAM_DATADGST_EN: 468358ff019SMike Christie sscanf(buf, "%d", &value); 46965e7ae7bSOr Gerlitz if (value) { 47065e7ae7bSOr Gerlitz printk(KERN_ERR "DataDigest wasn't negotiated to None"); 47165e7ae7bSOr Gerlitz return -EPROTO; 47265e7ae7bSOr Gerlitz } 47365e7ae7bSOr Gerlitz break; 47465e7ae7bSOr Gerlitz case ISCSI_PARAM_IFMARKER_EN: 475358ff019SMike Christie sscanf(buf, "%d", &value); 47665e7ae7bSOr Gerlitz if (value) { 47765e7ae7bSOr Gerlitz printk(KERN_ERR "IFMarker wasn't negotiated to No"); 47865e7ae7bSOr Gerlitz return -EPROTO; 47965e7ae7bSOr Gerlitz } 48065e7ae7bSOr Gerlitz break; 48165e7ae7bSOr Gerlitz case ISCSI_PARAM_OFMARKER_EN: 482358ff019SMike Christie sscanf(buf, "%d", &value); 48365e7ae7bSOr Gerlitz if (value) { 48465e7ae7bSOr Gerlitz printk(KERN_ERR "OFMarker wasn't negotiated to No"); 48565e7ae7bSOr Gerlitz return -EPROTO; 48665e7ae7bSOr Gerlitz } 48765e7ae7bSOr Gerlitz break; 48865e7ae7bSOr Gerlitz default: 489358ff019SMike Christie return iscsi_set_param(cls_conn, param, buf, buflen); 49065e7ae7bSOr Gerlitz } 49165e7ae7bSOr Gerlitz 49265e7ae7bSOr Gerlitz return 0; 49365e7ae7bSOr Gerlitz } 49465e7ae7bSOr Gerlitz 49565e7ae7bSOr Gerlitz static void 49665e7ae7bSOr Gerlitz iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 49765e7ae7bSOr Gerlitz { 49865e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 49965e7ae7bSOr Gerlitz 50065e7ae7bSOr Gerlitz stats->txdata_octets = conn->txdata_octets; 50165e7ae7bSOr Gerlitz stats->rxdata_octets = conn->rxdata_octets; 50265e7ae7bSOr Gerlitz stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 50365e7ae7bSOr Gerlitz stats->dataout_pdus = conn->dataout_pdus_cnt; 50465e7ae7bSOr Gerlitz stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 50565e7ae7bSOr Gerlitz stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 50665e7ae7bSOr Gerlitz stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 50765e7ae7bSOr Gerlitz stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 50865e7ae7bSOr Gerlitz stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 50987528227SEli Dorfman stats->custom_length = 4; 51065e7ae7bSOr Gerlitz strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 51165e7ae7bSOr Gerlitz stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 51265e7ae7bSOr Gerlitz strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 51365e7ae7bSOr Gerlitz stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 51465e7ae7bSOr Gerlitz strcpy(stats->custom[2].desc, "eh_abort_cnt"); 51565e7ae7bSOr Gerlitz stats->custom[2].value = conn->eh_abort_cnt; 51687528227SEli Dorfman strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 51787528227SEli Dorfman stats->custom[3].value = conn->fmr_unalign_cnt; 51865e7ae7bSOr Gerlitz } 51965e7ae7bSOr Gerlitz 520412eeafaSMike Christie static struct iscsi_endpoint * 521412eeafaSMike Christie iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking) 52265e7ae7bSOr Gerlitz { 52365e7ae7bSOr Gerlitz int err; 52465e7ae7bSOr Gerlitz struct iser_conn *ib_conn; 525412eeafaSMike Christie struct iscsi_endpoint *ep; 52665e7ae7bSOr Gerlitz 527412eeafaSMike Christie ep = iscsi_create_endpoint(sizeof(*ib_conn)); 528412eeafaSMike Christie if (!ep) 529412eeafaSMike Christie return ERR_PTR(-ENOMEM); 53065e7ae7bSOr Gerlitz 531412eeafaSMike Christie ib_conn = ep->dd_data; 532412eeafaSMike Christie ib_conn->ep = ep; 533412eeafaSMike Christie iser_conn_init(ib_conn); 53465e7ae7bSOr Gerlitz 535412eeafaSMike Christie err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, 536412eeafaSMike Christie non_blocking); 537412eeafaSMike Christie if (err) { 538412eeafaSMike Christie iscsi_destroy_endpoint(ep); 539412eeafaSMike Christie return ERR_PTR(err); 540412eeafaSMike Christie } 541412eeafaSMike Christie return ep; 54265e7ae7bSOr Gerlitz } 54365e7ae7bSOr Gerlitz 54465e7ae7bSOr Gerlitz static int 545412eeafaSMike Christie iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 54665e7ae7bSOr Gerlitz { 547412eeafaSMike Christie struct iser_conn *ib_conn; 54865e7ae7bSOr Gerlitz int rc; 54965e7ae7bSOr Gerlitz 550412eeafaSMike Christie ib_conn = ep->dd_data; 55165e7ae7bSOr Gerlitz rc = wait_event_interruptible_timeout(ib_conn->wait, 55265e7ae7bSOr Gerlitz ib_conn->state == ISER_CONN_UP, 55365e7ae7bSOr Gerlitz msecs_to_jiffies(timeout_ms)); 55465e7ae7bSOr Gerlitz 55565e7ae7bSOr Gerlitz /* if conn establishment failed, return error code to iscsi */ 55665e7ae7bSOr Gerlitz if (!rc && 55765e7ae7bSOr Gerlitz (ib_conn->state == ISER_CONN_TERMINATING || 55865e7ae7bSOr Gerlitz ib_conn->state == ISER_CONN_DOWN)) 55965e7ae7bSOr Gerlitz rc = -1; 56065e7ae7bSOr Gerlitz 56165e7ae7bSOr Gerlitz iser_err("ib conn %p rc = %d\n", ib_conn, rc); 56265e7ae7bSOr Gerlitz 56365e7ae7bSOr Gerlitz if (rc > 0) 56465e7ae7bSOr Gerlitz return 1; /* success, this is the equivalent of POLLOUT */ 56565e7ae7bSOr Gerlitz else if (!rc) 56665e7ae7bSOr Gerlitz return 0; /* timeout */ 56765e7ae7bSOr Gerlitz else 56865e7ae7bSOr Gerlitz return rc; /* signal */ 56965e7ae7bSOr Gerlitz } 57065e7ae7bSOr Gerlitz 57165e7ae7bSOr Gerlitz static void 572412eeafaSMike Christie iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 57365e7ae7bSOr Gerlitz { 5741c83469dSMike Christie struct iser_conn *ib_conn; 57565e7ae7bSOr Gerlitz 576412eeafaSMike Christie ib_conn = ep->dd_data; 577b40977d9SMike Christie if (ib_conn->iser_conn) 578b40977d9SMike Christie /* 579b40977d9SMike Christie * Must suspend xmit path if the ep is bound to the 580b40977d9SMike Christie * iscsi_conn, so we know we are not accessing the ib_conn 581b40977d9SMike Christie * when we free it. 582b40977d9SMike Christie * 583b40977d9SMike Christie * This may not be bound if the ep poll failed. 584b40977d9SMike Christie */ 585b40977d9SMike Christie iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); 586b40977d9SMike Christie 58765e7ae7bSOr Gerlitz 58865e7ae7bSOr Gerlitz iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); 58965e7ae7bSOr Gerlitz iser_conn_terminate(ib_conn); 59065e7ae7bSOr Gerlitz } 59165e7ae7bSOr Gerlitz 59265e7ae7bSOr Gerlitz static struct scsi_host_template iscsi_iser_sht = { 5937974392cSMike Christie .module = THIS_MODULE, 59465e7ae7bSOr Gerlitz .name = "iSCSI Initiator over iSER, v." DRV_VER, 59565e7ae7bSOr Gerlitz .queuecommand = iscsi_queuecommand, 5966410627eSErez Zilber .change_queue_depth = iscsi_change_queue_depth, 59765e7ae7bSOr Gerlitz .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 5988072ec2fSErez Zilber .max_sectors = 1024, 59965e7ae7bSOr Gerlitz .cmd_per_lun = ISCSI_MAX_CMD_PER_LUN, 60065e7ae7bSOr Gerlitz .eh_abort_handler = iscsi_eh_abort, 60190c18f3cSErez Zilber .eh_device_reset_handler= iscsi_eh_device_reset, 6028e124525SMike Christie .eh_target_reset_handler= iscsi_eh_target_reset, 60365e7ae7bSOr Gerlitz .use_clustering = DISABLE_CLUSTERING, 60465e7ae7bSOr Gerlitz .proc_name = "iscsi_iser", 60565e7ae7bSOr Gerlitz .this_id = -1, 60665e7ae7bSOr Gerlitz }; 60765e7ae7bSOr Gerlitz 60865e7ae7bSOr Gerlitz static struct iscsi_transport iscsi_iser_transport = { 60965e7ae7bSOr Gerlitz .owner = THIS_MODULE, 61065e7ae7bSOr Gerlitz .name = "iser", 61165e7ae7bSOr Gerlitz .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, 61265e7ae7bSOr Gerlitz .param_mask = ISCSI_MAX_RECV_DLENGTH | 61365e7ae7bSOr Gerlitz ISCSI_MAX_XMIT_DLENGTH | 61465e7ae7bSOr Gerlitz ISCSI_HDRDGST_EN | 61565e7ae7bSOr Gerlitz ISCSI_DATADGST_EN | 61665e7ae7bSOr Gerlitz ISCSI_INITIAL_R2T_EN | 61765e7ae7bSOr Gerlitz ISCSI_MAX_R2T | 61865e7ae7bSOr Gerlitz ISCSI_IMM_DATA_EN | 61965e7ae7bSOr Gerlitz ISCSI_FIRST_BURST | 62065e7ae7bSOr Gerlitz ISCSI_MAX_BURST | 62165e7ae7bSOr Gerlitz ISCSI_PDU_INORDER_EN | 622358ff019SMike Christie ISCSI_DATASEQ_INORDER_EN | 623358ff019SMike Christie ISCSI_EXP_STATSN | 624358ff019SMike Christie ISCSI_PERSISTENT_PORT | 625358ff019SMike Christie ISCSI_PERSISTENT_ADDRESS | 626b2c64167SMike Christie ISCSI_TARGET_NAME | ISCSI_TPGT | 627b2c64167SMike Christie ISCSI_USERNAME | ISCSI_PASSWORD | 628f6d5180cSMike Christie ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | 629f6d5180cSMike Christie ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | 63088dfd340SMike Christie ISCSI_PING_TMO | ISCSI_RECV_TMO | 63188dfd340SMike Christie ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, 6328ad5781aSMike Christie .host_param_mask = ISCSI_HOST_HWADDRESS | 633d8196ed2SMike Christie ISCSI_HOST_NETDEV_NAME | 6348ad5781aSMike Christie ISCSI_HOST_INITIATOR_NAME, 63565e7ae7bSOr Gerlitz /* session management */ 63665e7ae7bSOr Gerlitz .create_session = iscsi_iser_session_create, 63775613521SMike Christie .destroy_session = iscsi_iser_session_destroy, 63865e7ae7bSOr Gerlitz /* connection management */ 63965e7ae7bSOr Gerlitz .create_conn = iscsi_iser_conn_create, 64065e7ae7bSOr Gerlitz .bind_conn = iscsi_iser_conn_bind, 64165e7ae7bSOr Gerlitz .destroy_conn = iscsi_iser_conn_destroy, 642358ff019SMike Christie .set_param = iscsi_iser_set_param, 643358ff019SMike Christie .get_conn_param = iscsi_conn_get_param, 644358ff019SMike Christie .get_session_param = iscsi_session_get_param, 64565e7ae7bSOr Gerlitz .start_conn = iscsi_iser_conn_start, 646b40977d9SMike Christie .stop_conn = iscsi_iser_conn_stop, 6470801c242SMike Christie /* iscsi host params */ 6480801c242SMike Christie .get_host_param = iscsi_host_get_param, 6490801c242SMike Christie .set_host_param = iscsi_host_set_param, 65065e7ae7bSOr Gerlitz /* IO */ 65165e7ae7bSOr Gerlitz .send_pdu = iscsi_conn_send_pdu, 65265e7ae7bSOr Gerlitz .get_stats = iscsi_iser_conn_get_stats, 6532747fdb2SMike Christie .init_task = iscsi_iser_task_init, 6542747fdb2SMike Christie .xmit_task = iscsi_iser_task_xmit, 6552747fdb2SMike Christie .cleanup_task = iscsi_iser_cleanup_task, 6560f9c7449SMike Christie .alloc_pdu = iscsi_iser_pdu_alloc, 65765e7ae7bSOr Gerlitz /* recovery */ 65865e7ae7bSOr Gerlitz .session_recovery_timedout = iscsi_session_recovery_timedout, 65965e7ae7bSOr Gerlitz 66065e7ae7bSOr Gerlitz .ep_connect = iscsi_iser_ep_connect, 66165e7ae7bSOr Gerlitz .ep_poll = iscsi_iser_ep_poll, 66265e7ae7bSOr Gerlitz .ep_disconnect = iscsi_iser_ep_disconnect 66365e7ae7bSOr Gerlitz }; 66465e7ae7bSOr Gerlitz 66565e7ae7bSOr Gerlitz static int __init iser_init(void) 66665e7ae7bSOr Gerlitz { 66765e7ae7bSOr Gerlitz int err; 66865e7ae7bSOr Gerlitz 66965e7ae7bSOr Gerlitz iser_dbg("Starting iSER datamover...\n"); 67065e7ae7bSOr Gerlitz 67165e7ae7bSOr Gerlitz if (iscsi_max_lun < 1) { 67265e7ae7bSOr Gerlitz printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); 67365e7ae7bSOr Gerlitz return -EINVAL; 67465e7ae7bSOr Gerlitz } 67565e7ae7bSOr Gerlitz 67665e7ae7bSOr Gerlitz memset(&ig, 0, sizeof(struct iser_global)); 67765e7ae7bSOr Gerlitz 67865e7ae7bSOr Gerlitz ig.desc_cache = kmem_cache_create("iser_descriptors", 67965e7ae7bSOr Gerlitz sizeof (struct iser_desc), 68065e7ae7bSOr Gerlitz 0, SLAB_HWCACHE_ALIGN, 68120c2df83SPaul Mundt NULL); 68265e7ae7bSOr Gerlitz if (ig.desc_cache == NULL) 68365e7ae7bSOr Gerlitz return -ENOMEM; 68465e7ae7bSOr Gerlitz 68565e7ae7bSOr Gerlitz /* device init is called only after the first addr resolution */ 68665e7ae7bSOr Gerlitz mutex_init(&ig.device_list_mutex); 68765e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.device_list); 68865e7ae7bSOr Gerlitz mutex_init(&ig.connlist_mutex); 68965e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.connlist); 69065e7ae7bSOr Gerlitz 69175613521SMike Christie iscsi_iser_scsi_transport = iscsi_register_transport( 69275613521SMike Christie &iscsi_iser_transport); 69375613521SMike Christie if (!iscsi_iser_scsi_transport) { 69465e7ae7bSOr Gerlitz iser_err("iscsi_register_transport failed\n"); 69565e7ae7bSOr Gerlitz err = -EINVAL; 69665e7ae7bSOr Gerlitz goto register_transport_failure; 69765e7ae7bSOr Gerlitz } 69865e7ae7bSOr Gerlitz 69965e7ae7bSOr Gerlitz return 0; 70065e7ae7bSOr Gerlitz 70165e7ae7bSOr Gerlitz register_transport_failure: 70265e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 70365e7ae7bSOr Gerlitz 70465e7ae7bSOr Gerlitz return err; 70565e7ae7bSOr Gerlitz } 70665e7ae7bSOr Gerlitz 70765e7ae7bSOr Gerlitz static void __exit iser_exit(void) 70865e7ae7bSOr Gerlitz { 70965e7ae7bSOr Gerlitz iser_dbg("Removing iSER datamover...\n"); 71065e7ae7bSOr Gerlitz iscsi_unregister_transport(&iscsi_iser_transport); 71165e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 71265e7ae7bSOr Gerlitz } 71365e7ae7bSOr Gerlitz 71465e7ae7bSOr Gerlitz module_init(iser_init); 71565e7ae7bSOr Gerlitz module_exit(iser_exit); 716