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 uint32_t ret_itt; 10265e7ae7bSOr Gerlitz int datalen; 10365e7ae7bSOr Gerlitz int ahslen; 10465e7ae7bSOr Gerlitz 10565e7ae7bSOr Gerlitz /* verify PDU length */ 10665e7ae7bSOr Gerlitz datalen = ntoh24(hdr->dlength); 10765e7ae7bSOr Gerlitz if (datalen != rx_data_len) { 10865e7ae7bSOr Gerlitz printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n", 10965e7ae7bSOr Gerlitz datalen, rx_data_len); 11065e7ae7bSOr Gerlitz rc = ISCSI_ERR_DATALEN; 11165e7ae7bSOr Gerlitz goto error; 11265e7ae7bSOr Gerlitz } 11365e7ae7bSOr Gerlitz 11465e7ae7bSOr Gerlitz /* read AHS */ 11565e7ae7bSOr Gerlitz ahslen = hdr->hlength * 4; 11665e7ae7bSOr Gerlitz 11765e7ae7bSOr Gerlitz /* verify itt (itt encoding: age+cid+itt) */ 11865e7ae7bSOr Gerlitz rc = iscsi_verify_itt(conn, hdr, &ret_itt); 11965e7ae7bSOr Gerlitz 12065e7ae7bSOr Gerlitz if (!rc) 12165e7ae7bSOr Gerlitz rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 12265e7ae7bSOr Gerlitz 12365e7ae7bSOr Gerlitz if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 12465e7ae7bSOr Gerlitz goto error; 12565e7ae7bSOr Gerlitz 12665e7ae7bSOr Gerlitz return; 12765e7ae7bSOr Gerlitz error: 12865e7ae7bSOr Gerlitz iscsi_conn_failure(conn, rc); 12965e7ae7bSOr Gerlitz } 13065e7ae7bSOr Gerlitz 13165e7ae7bSOr Gerlitz 13265e7ae7bSOr Gerlitz /** 13365e7ae7bSOr Gerlitz * iscsi_iser_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands 13465e7ae7bSOr Gerlitz * 13565e7ae7bSOr Gerlitz **/ 136a8ac6311SOlaf Kirch static int 13765e7ae7bSOr Gerlitz iscsi_iser_cmd_init(struct iscsi_cmd_task *ctask) 13865e7ae7bSOr Gerlitz { 13965e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn = ctask->conn->dd_data; 14065e7ae7bSOr Gerlitz struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; 14165e7ae7bSOr Gerlitz 14265e7ae7bSOr Gerlitz iser_ctask->command_sent = 0; 14365e7ae7bSOr Gerlitz iser_ctask->iser_conn = iser_conn; 14465e7ae7bSOr Gerlitz iser_ctask_rdma_init(iser_ctask); 145a8ac6311SOlaf Kirch return 0; 14665e7ae7bSOr Gerlitz } 14765e7ae7bSOr Gerlitz 14865e7ae7bSOr Gerlitz /** 14965e7ae7bSOr Gerlitz * iscsi_mtask_xmit - xmit management(immediate) task 15065e7ae7bSOr Gerlitz * @conn: iscsi connection 15165e7ae7bSOr Gerlitz * @mtask: task management task 15265e7ae7bSOr Gerlitz * 15365e7ae7bSOr Gerlitz * Notes: 15465e7ae7bSOr Gerlitz * The function can return -EAGAIN in which case caller must 15565e7ae7bSOr Gerlitz * call it again later, or recover. '0' return code means successful 15665e7ae7bSOr Gerlitz * xmit. 15765e7ae7bSOr Gerlitz * 15865e7ae7bSOr Gerlitz **/ 15965e7ae7bSOr Gerlitz static int 16065e7ae7bSOr Gerlitz iscsi_iser_mtask_xmit(struct iscsi_conn *conn, 16165e7ae7bSOr Gerlitz struct iscsi_mgmt_task *mtask) 16265e7ae7bSOr Gerlitz { 16365e7ae7bSOr Gerlitz int error = 0; 16465e7ae7bSOr Gerlitz 16565e7ae7bSOr Gerlitz debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id, mtask->itt); 16665e7ae7bSOr Gerlitz 16765e7ae7bSOr Gerlitz error = iser_send_control(conn, mtask); 16865e7ae7bSOr Gerlitz 16965e7ae7bSOr Gerlitz /* since iser xmits control with zero copy, mtasks can not be recycled 17065e7ae7bSOr Gerlitz * right after sending them. 17165e7ae7bSOr Gerlitz * The recycling scheme is based on whether a response is expected 17265e7ae7bSOr Gerlitz * - if yes, the mtask is recycled at iscsi_complete_pdu 17365e7ae7bSOr Gerlitz * - if no, the mtask is recycled at iser_snd_completion 17465e7ae7bSOr Gerlitz */ 175f0938401SErez Zilber if (error && error != -ENOBUFS) 17665e7ae7bSOr Gerlitz iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 17765e7ae7bSOr Gerlitz 17865e7ae7bSOr Gerlitz return error; 17965e7ae7bSOr Gerlitz } 18065e7ae7bSOr Gerlitz 18165e7ae7bSOr Gerlitz static int 18265e7ae7bSOr Gerlitz iscsi_iser_ctask_xmit_unsol_data(struct iscsi_conn *conn, 18365e7ae7bSOr Gerlitz struct iscsi_cmd_task *ctask) 18465e7ae7bSOr Gerlitz { 18565e7ae7bSOr Gerlitz struct iscsi_data hdr; 18665e7ae7bSOr Gerlitz int error = 0; 18765e7ae7bSOr Gerlitz 18865e7ae7bSOr Gerlitz /* Send data-out PDUs while there's still unsolicited data to send */ 18965e7ae7bSOr Gerlitz while (ctask->unsol_count > 0) { 190ffd0436eSMike Christie iscsi_prep_unsolicit_data_pdu(ctask, &hdr); 19165e7ae7bSOr Gerlitz debug_scsi("Sending data-out: itt 0x%x, data count %d\n", 19265e7ae7bSOr Gerlitz hdr.itt, ctask->data_count); 19365e7ae7bSOr Gerlitz 19465e7ae7bSOr Gerlitz /* the buffer description has been passed with the command */ 19565e7ae7bSOr Gerlitz /* Send the command */ 19665e7ae7bSOr Gerlitz error = iser_send_data_out(conn, ctask, &hdr); 19765e7ae7bSOr Gerlitz if (error) { 19865e7ae7bSOr Gerlitz ctask->unsol_datasn--; 19965e7ae7bSOr Gerlitz goto iscsi_iser_ctask_xmit_unsol_data_exit; 20065e7ae7bSOr Gerlitz } 20165e7ae7bSOr Gerlitz ctask->unsol_count -= ctask->data_count; 20265e7ae7bSOr Gerlitz debug_scsi("Need to send %d more as data-out PDUs\n", 20365e7ae7bSOr Gerlitz ctask->unsol_count); 20465e7ae7bSOr Gerlitz } 20565e7ae7bSOr Gerlitz 20665e7ae7bSOr Gerlitz iscsi_iser_ctask_xmit_unsol_data_exit: 20765e7ae7bSOr Gerlitz return error; 20865e7ae7bSOr Gerlitz } 20965e7ae7bSOr Gerlitz 21065e7ae7bSOr Gerlitz static int 21165e7ae7bSOr Gerlitz iscsi_iser_ctask_xmit(struct iscsi_conn *conn, 21265e7ae7bSOr Gerlitz struct iscsi_cmd_task *ctask) 21365e7ae7bSOr Gerlitz { 21465e7ae7bSOr Gerlitz struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; 21565e7ae7bSOr Gerlitz int error = 0; 21665e7ae7bSOr Gerlitz 21777a23c21SMike Christie if (ctask->sc->sc_data_direction == DMA_TO_DEVICE) { 218da9c0c77SFUJITA Tomonori BUG_ON(scsi_bufflen(ctask->sc) == 0); 21977a23c21SMike Christie 22077a23c21SMike Christie debug_scsi("cmd [itt %x total %d imm %d unsol_data %d\n", 221da9c0c77SFUJITA Tomonori ctask->itt, scsi_bufflen(ctask->sc), 22277a23c21SMike Christie ctask->imm_count, ctask->unsol_count); 22377a23c21SMike Christie } 22477a23c21SMike Christie 22565e7ae7bSOr Gerlitz debug_scsi("ctask deq [cid %d itt 0x%x]\n", 22665e7ae7bSOr Gerlitz conn->id, ctask->itt); 22765e7ae7bSOr Gerlitz 22865e7ae7bSOr Gerlitz /* Send the cmd PDU */ 22965e7ae7bSOr Gerlitz if (!iser_ctask->command_sent) { 23065e7ae7bSOr Gerlitz error = iser_send_command(conn, ctask); 23165e7ae7bSOr Gerlitz if (error) 23265e7ae7bSOr Gerlitz goto iscsi_iser_ctask_xmit_exit; 23365e7ae7bSOr Gerlitz iser_ctask->command_sent = 1; 23465e7ae7bSOr Gerlitz } 23565e7ae7bSOr Gerlitz 23665e7ae7bSOr Gerlitz /* Send unsolicited data-out PDU(s) if necessary */ 23765e7ae7bSOr Gerlitz if (ctask->unsol_count) 23865e7ae7bSOr Gerlitz error = iscsi_iser_ctask_xmit_unsol_data(conn, ctask); 23965e7ae7bSOr Gerlitz 24065e7ae7bSOr Gerlitz iscsi_iser_ctask_xmit_exit: 241f0938401SErez Zilber if (error && error != -ENOBUFS) 24265e7ae7bSOr Gerlitz iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 24365e7ae7bSOr Gerlitz return error; 24465e7ae7bSOr Gerlitz } 24565e7ae7bSOr Gerlitz 24665e7ae7bSOr Gerlitz static void 24765e7ae7bSOr Gerlitz iscsi_iser_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) 24865e7ae7bSOr Gerlitz { 24965e7ae7bSOr Gerlitz struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; 25065e7ae7bSOr Gerlitz 25165e7ae7bSOr Gerlitz if (iser_ctask->status == ISER_TASK_STATUS_STARTED) { 25265e7ae7bSOr Gerlitz iser_ctask->status = ISER_TASK_STATUS_COMPLETED; 25365e7ae7bSOr Gerlitz iser_ctask_rdma_finalize(iser_ctask); 25465e7ae7bSOr Gerlitz } 25565e7ae7bSOr Gerlitz } 25665e7ae7bSOr Gerlitz 25765e7ae7bSOr Gerlitz static struct iser_conn * 25865e7ae7bSOr Gerlitz iscsi_iser_ib_conn_lookup(__u64 ep_handle) 25965e7ae7bSOr Gerlitz { 26065e7ae7bSOr Gerlitz struct iser_conn *ib_conn; 26165e7ae7bSOr Gerlitz struct iser_conn *uib_conn = (struct iser_conn *)(unsigned long)ep_handle; 26265e7ae7bSOr Gerlitz 26365e7ae7bSOr Gerlitz mutex_lock(&ig.connlist_mutex); 26465e7ae7bSOr Gerlitz list_for_each_entry(ib_conn, &ig.connlist, conn_list) { 26565e7ae7bSOr Gerlitz if (ib_conn == uib_conn) { 26665e7ae7bSOr Gerlitz mutex_unlock(&ig.connlist_mutex); 26765e7ae7bSOr Gerlitz return ib_conn; 26865e7ae7bSOr Gerlitz } 26965e7ae7bSOr Gerlitz } 27065e7ae7bSOr Gerlitz mutex_unlock(&ig.connlist_mutex); 27165e7ae7bSOr Gerlitz iser_err("no conn exists for eph %llx\n",(unsigned long long)ep_handle); 27265e7ae7bSOr Gerlitz return NULL; 27365e7ae7bSOr Gerlitz } 27465e7ae7bSOr Gerlitz 27565e7ae7bSOr Gerlitz static struct iscsi_cls_conn * 27665e7ae7bSOr Gerlitz iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 27765e7ae7bSOr Gerlitz { 27865e7ae7bSOr Gerlitz struct iscsi_conn *conn; 27965e7ae7bSOr Gerlitz struct iscsi_cls_conn *cls_conn; 28065e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn; 28165e7ae7bSOr Gerlitz 2825d91e209SMike Christie cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); 28365e7ae7bSOr Gerlitz if (!cls_conn) 28465e7ae7bSOr Gerlitz return NULL; 28565e7ae7bSOr Gerlitz conn = cls_conn->dd_data; 28665e7ae7bSOr Gerlitz 28765e7ae7bSOr Gerlitz /* 28865e7ae7bSOr Gerlitz * due to issues with the login code re iser sematics 28965e7ae7bSOr Gerlitz * this not set in iscsi_conn_setup - FIXME 29065e7ae7bSOr Gerlitz */ 29165e7ae7bSOr Gerlitz conn->max_recv_dlength = 128; 29265e7ae7bSOr Gerlitz 2935d91e209SMike Christie iser_conn = conn->dd_data; 29465e7ae7bSOr Gerlitz /* currently this is the only field which need to be initiated */ 29565e7ae7bSOr Gerlitz rwlock_init(&iser_conn->lock); 29665e7ae7bSOr Gerlitz 29765e7ae7bSOr Gerlitz conn->dd_data = iser_conn; 29865e7ae7bSOr Gerlitz iser_conn->iscsi_conn = conn; 29965e7ae7bSOr Gerlitz 30065e7ae7bSOr Gerlitz return cls_conn; 30165e7ae7bSOr Gerlitz } 30265e7ae7bSOr Gerlitz 30365e7ae7bSOr Gerlitz static void 30465e7ae7bSOr Gerlitz iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) 30565e7ae7bSOr Gerlitz { 30665e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 30765e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn = conn->dd_data; 30865e7ae7bSOr Gerlitz 30987e8df7aSErez Zilber if (iser_conn->ib_conn) 31087e8df7aSErez Zilber iser_conn->ib_conn->iser_conn = NULL; 3115d91e209SMike Christie iscsi_conn_teardown(cls_conn); 31265e7ae7bSOr Gerlitz } 31365e7ae7bSOr Gerlitz 31465e7ae7bSOr Gerlitz static int 31565e7ae7bSOr Gerlitz iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 31665e7ae7bSOr Gerlitz struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, 31765e7ae7bSOr Gerlitz int is_leading) 31865e7ae7bSOr Gerlitz { 31965e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 32065e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn; 32165e7ae7bSOr Gerlitz struct iser_conn *ib_conn; 32265e7ae7bSOr Gerlitz int error; 32365e7ae7bSOr Gerlitz 32465e7ae7bSOr Gerlitz error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 32565e7ae7bSOr Gerlitz if (error) 32665e7ae7bSOr Gerlitz return error; 32765e7ae7bSOr Gerlitz 32865e7ae7bSOr Gerlitz /* the transport ep handle comes from user space so it must be 32965e7ae7bSOr Gerlitz * verified against the global ib connections list */ 33065e7ae7bSOr Gerlitz ib_conn = iscsi_iser_ib_conn_lookup(transport_eph); 33165e7ae7bSOr Gerlitz if (!ib_conn) { 33265e7ae7bSOr Gerlitz iser_err("can't bind eph %llx\n", 33365e7ae7bSOr Gerlitz (unsigned long long)transport_eph); 33465e7ae7bSOr Gerlitz return -EINVAL; 33565e7ae7bSOr Gerlitz } 33665e7ae7bSOr Gerlitz /* binds the iSER connection retrieved from the previously 33765e7ae7bSOr Gerlitz * connected ep_handle to the iSCSI layer connection. exchanges 33865e7ae7bSOr Gerlitz * connection pointers */ 33965e7ae7bSOr Gerlitz iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn); 34065e7ae7bSOr Gerlitz iser_conn = conn->dd_data; 34165e7ae7bSOr Gerlitz ib_conn->iser_conn = iser_conn; 34265e7ae7bSOr Gerlitz iser_conn->ib_conn = ib_conn; 34365e7ae7bSOr Gerlitz 34465e7ae7bSOr Gerlitz conn->recv_lock = &iser_conn->lock; 34565e7ae7bSOr Gerlitz 34665e7ae7bSOr Gerlitz return 0; 34765e7ae7bSOr Gerlitz } 34865e7ae7bSOr Gerlitz 34965e7ae7bSOr Gerlitz static int 35065e7ae7bSOr Gerlitz iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 35165e7ae7bSOr Gerlitz { 35265e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 35365e7ae7bSOr Gerlitz int err; 35465e7ae7bSOr Gerlitz 3552e7a7426SErez Zilber err = iser_conn_set_full_featured_mode(conn); 35665e7ae7bSOr Gerlitz if (err) 35765e7ae7bSOr Gerlitz return err; 35865e7ae7bSOr Gerlitz 3592e7a7426SErez Zilber return iscsi_conn_start(cls_conn); 36065e7ae7bSOr Gerlitz } 36165e7ae7bSOr Gerlitz 36275613521SMike Christie static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 36375613521SMike Christie { 36475613521SMike Christie struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 36575613521SMike Christie 366a4804cd6SMike Christie iscsi_host_remove(shost); 367a4804cd6SMike Christie iscsi_host_free(shost); 36875613521SMike Christie } 36965e7ae7bSOr Gerlitz 37065e7ae7bSOr Gerlitz static struct iscsi_cls_session * 37175613521SMike Christie iscsi_iser_session_create(struct Scsi_Host *shost, 3721548271eSMike Christie uint16_t cmds_max, uint16_t qdepth, 37365e7ae7bSOr Gerlitz uint32_t initial_cmdsn, uint32_t *hostno) 37465e7ae7bSOr Gerlitz { 37565e7ae7bSOr Gerlitz struct iscsi_cls_session *cls_session; 37665e7ae7bSOr Gerlitz struct iscsi_session *session; 37765e7ae7bSOr Gerlitz int i; 37865e7ae7bSOr Gerlitz struct iscsi_cmd_task *ctask; 37965e7ae7bSOr Gerlitz struct iscsi_mgmt_task *mtask; 38065e7ae7bSOr Gerlitz struct iscsi_iser_cmd_task *iser_ctask; 38165e7ae7bSOr Gerlitz struct iser_desc *desc; 38265e7ae7bSOr Gerlitz 38375613521SMike Christie if (shost) { 38475613521SMike Christie printk(KERN_ERR "iscsi_tcp: invalid shost %d.\n", 38575613521SMike Christie shost->host_no); 38675613521SMike Christie return NULL; 38775613521SMike Christie } 38875613521SMike Christie 389a4804cd6SMike Christie shost = iscsi_host_alloc(&iscsi_iser_sht, 0, ISCSI_MAX_CMD_PER_LUN); 39075613521SMike Christie if (!shost) 39175613521SMike Christie return NULL; 39275613521SMike Christie shost->transportt = iscsi_iser_scsi_transport; 39375613521SMike Christie shost->max_lun = iscsi_max_lun; 39475613521SMike Christie shost->max_id = 0; 39575613521SMike Christie shost->max_channel = 0; 39675613521SMike Christie shost->max_cmd_len = 16; 39775613521SMike Christie 398a4804cd6SMike Christie if (iscsi_host_add(shost, NULL)) 39975613521SMike Christie goto free_host; 40075613521SMike Christie *hostno = shost->host_no; 40175613521SMike Christie 4021548271eSMike Christie /* 4031548271eSMike Christie * we do not support setting can_queue cmd_per_lun from userspace yet 4041548271eSMike Christie * because we preallocate so many resources 4051548271eSMike Christie */ 40675613521SMike Christie cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 4071548271eSMike Christie ISCSI_DEF_XMIT_CMDS_MAX, 40865e7ae7bSOr Gerlitz sizeof(struct iscsi_iser_cmd_task), 40965e7ae7bSOr Gerlitz sizeof(struct iser_desc), 41075613521SMike Christie initial_cmdsn); 41165e7ae7bSOr Gerlitz if (!cls_session) 41275613521SMike Christie goto remove_host; 41375613521SMike Christie session = cls_session->dd_data; 41465e7ae7bSOr Gerlitz 41575613521SMike Christie shost->can_queue = session->cmds_max; 41665e7ae7bSOr Gerlitz /* libiscsi setup itts, data and pool so just set desc fields */ 41765e7ae7bSOr Gerlitz for (i = 0; i < session->cmds_max; i++) { 41865e7ae7bSOr Gerlitz ctask = session->cmds[i]; 41965e7ae7bSOr Gerlitz iser_ctask = ctask->dd_data; 42065e7ae7bSOr Gerlitz ctask->hdr = (struct iscsi_cmd *)&iser_ctask->desc.iscsi_header; 42138ad03deSBoaz Harrosh ctask->hdr_max = sizeof(iser_ctask->desc.iscsi_header); 42265e7ae7bSOr Gerlitz } 42365e7ae7bSOr Gerlitz 42465e7ae7bSOr Gerlitz for (i = 0; i < session->mgmtpool_max; i++) { 42565e7ae7bSOr Gerlitz mtask = session->mgmt_cmds[i]; 42665e7ae7bSOr Gerlitz desc = mtask->dd_data; 42765e7ae7bSOr Gerlitz mtask->hdr = &desc->iscsi_header; 42865e7ae7bSOr Gerlitz desc->data = mtask->data; 42965e7ae7bSOr Gerlitz } 43065e7ae7bSOr Gerlitz 43165e7ae7bSOr Gerlitz return cls_session; 43275613521SMike Christie 43375613521SMike Christie remove_host: 434a4804cd6SMike Christie iscsi_host_remove(shost); 43575613521SMike Christie free_host: 436a4804cd6SMike Christie iscsi_host_free(shost); 43775613521SMike Christie return NULL; 43865e7ae7bSOr Gerlitz } 43965e7ae7bSOr Gerlitz 44065e7ae7bSOr Gerlitz static int 441358ff019SMike Christie iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 442358ff019SMike Christie enum iscsi_param param, char *buf, int buflen) 44365e7ae7bSOr Gerlitz { 444358ff019SMike Christie int value; 44565e7ae7bSOr Gerlitz 44665e7ae7bSOr Gerlitz switch (param) { 44765e7ae7bSOr Gerlitz case ISCSI_PARAM_MAX_RECV_DLENGTH: 44865e7ae7bSOr Gerlitz /* TBD */ 44965e7ae7bSOr Gerlitz break; 45065e7ae7bSOr Gerlitz case ISCSI_PARAM_HDRDGST_EN: 451358ff019SMike Christie sscanf(buf, "%d", &value); 45265e7ae7bSOr Gerlitz if (value) { 45365e7ae7bSOr Gerlitz printk(KERN_ERR "DataDigest wasn't negotiated to None"); 45465e7ae7bSOr Gerlitz return -EPROTO; 45565e7ae7bSOr Gerlitz } 45665e7ae7bSOr Gerlitz break; 45765e7ae7bSOr Gerlitz case ISCSI_PARAM_DATADGST_EN: 458358ff019SMike Christie sscanf(buf, "%d", &value); 45965e7ae7bSOr Gerlitz if (value) { 46065e7ae7bSOr Gerlitz printk(KERN_ERR "DataDigest wasn't negotiated to None"); 46165e7ae7bSOr Gerlitz return -EPROTO; 46265e7ae7bSOr Gerlitz } 46365e7ae7bSOr Gerlitz break; 46465e7ae7bSOr Gerlitz case ISCSI_PARAM_IFMARKER_EN: 465358ff019SMike Christie sscanf(buf, "%d", &value); 46665e7ae7bSOr Gerlitz if (value) { 46765e7ae7bSOr Gerlitz printk(KERN_ERR "IFMarker wasn't negotiated to No"); 46865e7ae7bSOr Gerlitz return -EPROTO; 46965e7ae7bSOr Gerlitz } 47065e7ae7bSOr Gerlitz break; 47165e7ae7bSOr Gerlitz case ISCSI_PARAM_OFMARKER_EN: 472358ff019SMike Christie sscanf(buf, "%d", &value); 47365e7ae7bSOr Gerlitz if (value) { 47465e7ae7bSOr Gerlitz printk(KERN_ERR "OFMarker wasn't negotiated to No"); 47565e7ae7bSOr Gerlitz return -EPROTO; 47665e7ae7bSOr Gerlitz } 47765e7ae7bSOr Gerlitz break; 47865e7ae7bSOr Gerlitz default: 479358ff019SMike Christie return iscsi_set_param(cls_conn, param, buf, buflen); 48065e7ae7bSOr Gerlitz } 48165e7ae7bSOr Gerlitz 48265e7ae7bSOr Gerlitz return 0; 48365e7ae7bSOr Gerlitz } 48465e7ae7bSOr Gerlitz 48565e7ae7bSOr Gerlitz static void 48665e7ae7bSOr Gerlitz iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 48765e7ae7bSOr Gerlitz { 48865e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 48965e7ae7bSOr Gerlitz 49065e7ae7bSOr Gerlitz stats->txdata_octets = conn->txdata_octets; 49165e7ae7bSOr Gerlitz stats->rxdata_octets = conn->rxdata_octets; 49265e7ae7bSOr Gerlitz stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 49365e7ae7bSOr Gerlitz stats->dataout_pdus = conn->dataout_pdus_cnt; 49465e7ae7bSOr Gerlitz stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 49565e7ae7bSOr Gerlitz stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 49665e7ae7bSOr Gerlitz stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 49765e7ae7bSOr Gerlitz stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 49865e7ae7bSOr Gerlitz stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 49987528227SEli Dorfman stats->custom_length = 4; 50065e7ae7bSOr Gerlitz strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 50165e7ae7bSOr Gerlitz stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 50265e7ae7bSOr Gerlitz strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 50365e7ae7bSOr Gerlitz stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 50465e7ae7bSOr Gerlitz strcpy(stats->custom[2].desc, "eh_abort_cnt"); 50565e7ae7bSOr Gerlitz stats->custom[2].value = conn->eh_abort_cnt; 50687528227SEli Dorfman strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 50787528227SEli Dorfman stats->custom[3].value = conn->fmr_unalign_cnt; 50865e7ae7bSOr Gerlitz } 50965e7ae7bSOr Gerlitz 51065e7ae7bSOr Gerlitz static int 51165e7ae7bSOr Gerlitz iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking, 51265e7ae7bSOr Gerlitz __u64 *ep_handle) 51365e7ae7bSOr Gerlitz { 51465e7ae7bSOr Gerlitz int err; 51565e7ae7bSOr Gerlitz struct iser_conn *ib_conn; 51665e7ae7bSOr Gerlitz 51765e7ae7bSOr Gerlitz err = iser_conn_init(&ib_conn); 51865e7ae7bSOr Gerlitz if (err) 51965e7ae7bSOr Gerlitz goto out; 52065e7ae7bSOr Gerlitz 52165e7ae7bSOr Gerlitz err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, non_blocking); 52265e7ae7bSOr Gerlitz if (!err) 52365e7ae7bSOr Gerlitz *ep_handle = (__u64)(unsigned long)ib_conn; 52465e7ae7bSOr Gerlitz 52565e7ae7bSOr Gerlitz out: 52665e7ae7bSOr Gerlitz return err; 52765e7ae7bSOr Gerlitz } 52865e7ae7bSOr Gerlitz 52965e7ae7bSOr Gerlitz static int 53065e7ae7bSOr Gerlitz iscsi_iser_ep_poll(__u64 ep_handle, int timeout_ms) 53165e7ae7bSOr Gerlitz { 53265e7ae7bSOr Gerlitz struct iser_conn *ib_conn = iscsi_iser_ib_conn_lookup(ep_handle); 53365e7ae7bSOr Gerlitz int rc; 53465e7ae7bSOr Gerlitz 53565e7ae7bSOr Gerlitz if (!ib_conn) 53665e7ae7bSOr Gerlitz return -EINVAL; 53765e7ae7bSOr Gerlitz 53865e7ae7bSOr Gerlitz rc = wait_event_interruptible_timeout(ib_conn->wait, 53965e7ae7bSOr Gerlitz ib_conn->state == ISER_CONN_UP, 54065e7ae7bSOr Gerlitz msecs_to_jiffies(timeout_ms)); 54165e7ae7bSOr Gerlitz 54265e7ae7bSOr Gerlitz /* if conn establishment failed, return error code to iscsi */ 54365e7ae7bSOr Gerlitz if (!rc && 54465e7ae7bSOr Gerlitz (ib_conn->state == ISER_CONN_TERMINATING || 54565e7ae7bSOr Gerlitz ib_conn->state == ISER_CONN_DOWN)) 54665e7ae7bSOr Gerlitz rc = -1; 54765e7ae7bSOr Gerlitz 54865e7ae7bSOr Gerlitz iser_err("ib conn %p rc = %d\n", ib_conn, rc); 54965e7ae7bSOr Gerlitz 55065e7ae7bSOr Gerlitz if (rc > 0) 55165e7ae7bSOr Gerlitz return 1; /* success, this is the equivalent of POLLOUT */ 55265e7ae7bSOr Gerlitz else if (!rc) 55365e7ae7bSOr Gerlitz return 0; /* timeout */ 55465e7ae7bSOr Gerlitz else 55565e7ae7bSOr Gerlitz return rc; /* signal */ 55665e7ae7bSOr Gerlitz } 55765e7ae7bSOr Gerlitz 55865e7ae7bSOr Gerlitz static void 55965e7ae7bSOr Gerlitz iscsi_iser_ep_disconnect(__u64 ep_handle) 56065e7ae7bSOr Gerlitz { 5611c83469dSMike Christie struct iser_conn *ib_conn; 56265e7ae7bSOr Gerlitz 5631c83469dSMike Christie ib_conn = iscsi_iser_ib_conn_lookup(ep_handle); 56465e7ae7bSOr Gerlitz if (!ib_conn) 56565e7ae7bSOr Gerlitz return; 56665e7ae7bSOr Gerlitz 56765e7ae7bSOr Gerlitz iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); 56865e7ae7bSOr Gerlitz iser_conn_terminate(ib_conn); 56965e7ae7bSOr Gerlitz } 57065e7ae7bSOr Gerlitz 57165e7ae7bSOr Gerlitz static struct scsi_host_template iscsi_iser_sht = { 5727974392cSMike Christie .module = THIS_MODULE, 57365e7ae7bSOr Gerlitz .name = "iSCSI Initiator over iSER, v." DRV_VER, 57465e7ae7bSOr Gerlitz .queuecommand = iscsi_queuecommand, 5756410627eSErez Zilber .change_queue_depth = iscsi_change_queue_depth, 5761548271eSMike Christie .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, 57765e7ae7bSOr Gerlitz .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 5788072ec2fSErez Zilber .max_sectors = 1024, 57965e7ae7bSOr Gerlitz .cmd_per_lun = ISCSI_MAX_CMD_PER_LUN, 58065e7ae7bSOr Gerlitz .eh_abort_handler = iscsi_eh_abort, 58190c18f3cSErez Zilber .eh_device_reset_handler= iscsi_eh_device_reset, 58265e7ae7bSOr Gerlitz .eh_host_reset_handler = iscsi_eh_host_reset, 58365e7ae7bSOr Gerlitz .use_clustering = DISABLE_CLUSTERING, 58465e7ae7bSOr Gerlitz .proc_name = "iscsi_iser", 58565e7ae7bSOr Gerlitz .this_id = -1, 58665e7ae7bSOr Gerlitz }; 58765e7ae7bSOr Gerlitz 58865e7ae7bSOr Gerlitz static struct iscsi_transport iscsi_iser_transport = { 58965e7ae7bSOr Gerlitz .owner = THIS_MODULE, 59065e7ae7bSOr Gerlitz .name = "iser", 59165e7ae7bSOr Gerlitz .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, 59265e7ae7bSOr Gerlitz .param_mask = ISCSI_MAX_RECV_DLENGTH | 59365e7ae7bSOr Gerlitz ISCSI_MAX_XMIT_DLENGTH | 59465e7ae7bSOr Gerlitz ISCSI_HDRDGST_EN | 59565e7ae7bSOr Gerlitz ISCSI_DATADGST_EN | 59665e7ae7bSOr Gerlitz ISCSI_INITIAL_R2T_EN | 59765e7ae7bSOr Gerlitz ISCSI_MAX_R2T | 59865e7ae7bSOr Gerlitz ISCSI_IMM_DATA_EN | 59965e7ae7bSOr Gerlitz ISCSI_FIRST_BURST | 60065e7ae7bSOr Gerlitz ISCSI_MAX_BURST | 60165e7ae7bSOr Gerlitz ISCSI_PDU_INORDER_EN | 602358ff019SMike Christie ISCSI_DATASEQ_INORDER_EN | 603358ff019SMike Christie ISCSI_EXP_STATSN | 604358ff019SMike Christie ISCSI_PERSISTENT_PORT | 605358ff019SMike Christie ISCSI_PERSISTENT_ADDRESS | 606b2c64167SMike Christie ISCSI_TARGET_NAME | ISCSI_TPGT | 607b2c64167SMike Christie ISCSI_USERNAME | ISCSI_PASSWORD | 608f6d5180cSMike Christie ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | 609f6d5180cSMike Christie ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | 610f6d5180cSMike Christie ISCSI_PING_TMO | ISCSI_RECV_TMO, 6118ad5781aSMike Christie .host_param_mask = ISCSI_HOST_HWADDRESS | 612d8196ed2SMike Christie ISCSI_HOST_NETDEV_NAME | 6138ad5781aSMike Christie ISCSI_HOST_INITIATOR_NAME, 61465e7ae7bSOr Gerlitz /* session management */ 61565e7ae7bSOr Gerlitz .create_session = iscsi_iser_session_create, 61675613521SMike Christie .destroy_session = iscsi_iser_session_destroy, 61765e7ae7bSOr Gerlitz /* connection management */ 61865e7ae7bSOr Gerlitz .create_conn = iscsi_iser_conn_create, 61965e7ae7bSOr Gerlitz .bind_conn = iscsi_iser_conn_bind, 62065e7ae7bSOr Gerlitz .destroy_conn = iscsi_iser_conn_destroy, 621358ff019SMike Christie .set_param = iscsi_iser_set_param, 622358ff019SMike Christie .get_conn_param = iscsi_conn_get_param, 623358ff019SMike Christie .get_session_param = iscsi_session_get_param, 62465e7ae7bSOr Gerlitz .start_conn = iscsi_iser_conn_start, 62565e7ae7bSOr Gerlitz .stop_conn = iscsi_conn_stop, 6260801c242SMike Christie /* iscsi host params */ 6270801c242SMike Christie .get_host_param = iscsi_host_get_param, 6280801c242SMike Christie .set_host_param = iscsi_host_set_param, 62965e7ae7bSOr Gerlitz /* IO */ 63065e7ae7bSOr Gerlitz .send_pdu = iscsi_conn_send_pdu, 63165e7ae7bSOr Gerlitz .get_stats = iscsi_iser_conn_get_stats, 63265e7ae7bSOr Gerlitz .init_cmd_task = iscsi_iser_cmd_init, 63365e7ae7bSOr Gerlitz .xmit_cmd_task = iscsi_iser_ctask_xmit, 63465e7ae7bSOr Gerlitz .xmit_mgmt_task = iscsi_iser_mtask_xmit, 63565e7ae7bSOr Gerlitz .cleanup_cmd_task = iscsi_iser_cleanup_ctask, 63665e7ae7bSOr Gerlitz /* recovery */ 63765e7ae7bSOr Gerlitz .session_recovery_timedout = iscsi_session_recovery_timedout, 63865e7ae7bSOr Gerlitz 63965e7ae7bSOr Gerlitz .ep_connect = iscsi_iser_ep_connect, 64065e7ae7bSOr Gerlitz .ep_poll = iscsi_iser_ep_poll, 64165e7ae7bSOr Gerlitz .ep_disconnect = iscsi_iser_ep_disconnect 64265e7ae7bSOr Gerlitz }; 64365e7ae7bSOr Gerlitz 64465e7ae7bSOr Gerlitz static int __init iser_init(void) 64565e7ae7bSOr Gerlitz { 64665e7ae7bSOr Gerlitz int err; 64765e7ae7bSOr Gerlitz 64865e7ae7bSOr Gerlitz iser_dbg("Starting iSER datamover...\n"); 64965e7ae7bSOr Gerlitz 65065e7ae7bSOr Gerlitz if (iscsi_max_lun < 1) { 65165e7ae7bSOr Gerlitz printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); 65265e7ae7bSOr Gerlitz return -EINVAL; 65365e7ae7bSOr Gerlitz } 65465e7ae7bSOr Gerlitz 65565e7ae7bSOr Gerlitz memset(&ig, 0, sizeof(struct iser_global)); 65665e7ae7bSOr Gerlitz 65765e7ae7bSOr Gerlitz ig.desc_cache = kmem_cache_create("iser_descriptors", 65865e7ae7bSOr Gerlitz sizeof (struct iser_desc), 65965e7ae7bSOr Gerlitz 0, SLAB_HWCACHE_ALIGN, 66020c2df83SPaul Mundt NULL); 66165e7ae7bSOr Gerlitz if (ig.desc_cache == NULL) 66265e7ae7bSOr Gerlitz return -ENOMEM; 66365e7ae7bSOr Gerlitz 66465e7ae7bSOr Gerlitz /* device init is called only after the first addr resolution */ 66565e7ae7bSOr Gerlitz mutex_init(&ig.device_list_mutex); 66665e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.device_list); 66765e7ae7bSOr Gerlitz mutex_init(&ig.connlist_mutex); 66865e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.connlist); 66965e7ae7bSOr Gerlitz 67075613521SMike Christie iscsi_iser_scsi_transport = iscsi_register_transport( 67175613521SMike Christie &iscsi_iser_transport); 67275613521SMike Christie if (!iscsi_iser_scsi_transport) { 67365e7ae7bSOr Gerlitz iser_err("iscsi_register_transport failed\n"); 67465e7ae7bSOr Gerlitz err = -EINVAL; 67565e7ae7bSOr Gerlitz goto register_transport_failure; 67665e7ae7bSOr Gerlitz } 67765e7ae7bSOr Gerlitz 67865e7ae7bSOr Gerlitz return 0; 67965e7ae7bSOr Gerlitz 68065e7ae7bSOr Gerlitz register_transport_failure: 68165e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 68265e7ae7bSOr Gerlitz 68365e7ae7bSOr Gerlitz return err; 68465e7ae7bSOr Gerlitz } 68565e7ae7bSOr Gerlitz 68665e7ae7bSOr Gerlitz static void __exit iser_exit(void) 68765e7ae7bSOr Gerlitz { 68865e7ae7bSOr Gerlitz iser_dbg("Removing iSER datamover...\n"); 68965e7ae7bSOr Gerlitz iscsi_unregister_transport(&iscsi_iser_transport); 69065e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 69165e7ae7bSOr Gerlitz } 69265e7ae7bSOr Gerlitz 69365e7ae7bSOr Gerlitz module_init(iser_init); 69465e7ae7bSOr Gerlitz module_exit(iser_exit); 695