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 7765e7ae7bSOr Gerlitz static unsigned int iscsi_max_lun = 512; 7865e7ae7bSOr Gerlitz module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); 7965e7ae7bSOr Gerlitz 8065e7ae7bSOr Gerlitz int iser_debug_level = 0; 8165e7ae7bSOr Gerlitz 8265e7ae7bSOr Gerlitz MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover " 8365e7ae7bSOr Gerlitz "v" DRV_VER " (" DRV_DATE ")"); 8465e7ae7bSOr Gerlitz MODULE_LICENSE("Dual BSD/GPL"); 8565e7ae7bSOr Gerlitz MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); 8665e7ae7bSOr Gerlitz 8765e7ae7bSOr Gerlitz module_param_named(debug_level, iser_debug_level, int, 0644); 8865e7ae7bSOr Gerlitz MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); 8965e7ae7bSOr Gerlitz 9065e7ae7bSOr Gerlitz struct iser_global ig; 9165e7ae7bSOr Gerlitz 9265e7ae7bSOr Gerlitz void 9365e7ae7bSOr Gerlitz iscsi_iser_recv(struct iscsi_conn *conn, 9465e7ae7bSOr Gerlitz struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) 9565e7ae7bSOr Gerlitz { 9665e7ae7bSOr Gerlitz int rc = 0; 9765e7ae7bSOr Gerlitz uint32_t ret_itt; 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 /* verify itt (itt encoding: age+cid+itt) */ 11465e7ae7bSOr Gerlitz rc = iscsi_verify_itt(conn, hdr, &ret_itt); 11565e7ae7bSOr Gerlitz 11665e7ae7bSOr Gerlitz if (!rc) 11765e7ae7bSOr Gerlitz rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 11865e7ae7bSOr Gerlitz 11965e7ae7bSOr Gerlitz if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 12065e7ae7bSOr Gerlitz goto error; 12165e7ae7bSOr Gerlitz 12265e7ae7bSOr Gerlitz return; 12365e7ae7bSOr Gerlitz error: 12465e7ae7bSOr Gerlitz iscsi_conn_failure(conn, rc); 12565e7ae7bSOr Gerlitz } 12665e7ae7bSOr Gerlitz 12765e7ae7bSOr Gerlitz 12865e7ae7bSOr Gerlitz /** 12965e7ae7bSOr Gerlitz * iscsi_iser_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands 13065e7ae7bSOr Gerlitz * 13165e7ae7bSOr Gerlitz **/ 13265e7ae7bSOr Gerlitz static void 13365e7ae7bSOr Gerlitz iscsi_iser_cmd_init(struct iscsi_cmd_task *ctask) 13465e7ae7bSOr Gerlitz { 13565e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn = ctask->conn->dd_data; 13665e7ae7bSOr Gerlitz struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; 13765e7ae7bSOr Gerlitz struct scsi_cmnd *sc = ctask->sc; 13865e7ae7bSOr Gerlitz 13965e7ae7bSOr Gerlitz iser_ctask->command_sent = 0; 14065e7ae7bSOr Gerlitz iser_ctask->iser_conn = iser_conn; 14165e7ae7bSOr Gerlitz 14265e7ae7bSOr Gerlitz if (sc->sc_data_direction == DMA_TO_DEVICE) { 14365e7ae7bSOr Gerlitz BUG_ON(ctask->total_length == 0); 14465e7ae7bSOr Gerlitz /* bytes to be sent via RDMA operations */ 14565e7ae7bSOr Gerlitz iser_ctask->rdma_data_count = ctask->total_length - 14665e7ae7bSOr Gerlitz ctask->imm_count - 14765e7ae7bSOr Gerlitz ctask->unsol_count; 14865e7ae7bSOr Gerlitz 14965e7ae7bSOr Gerlitz debug_scsi("cmd [itt %x total %d imm %d unsol_data %d " 15065e7ae7bSOr Gerlitz "rdma_data %d]\n", 15165e7ae7bSOr Gerlitz ctask->itt, ctask->total_length, ctask->imm_count, 15265e7ae7bSOr Gerlitz ctask->unsol_count, iser_ctask->rdma_data_count); 15365e7ae7bSOr Gerlitz } else 15465e7ae7bSOr Gerlitz /* bytes to be sent via RDMA operations */ 15565e7ae7bSOr Gerlitz iser_ctask->rdma_data_count = ctask->total_length; 15665e7ae7bSOr Gerlitz 15765e7ae7bSOr Gerlitz iser_ctask_rdma_init(iser_ctask); 15865e7ae7bSOr Gerlitz } 15965e7ae7bSOr Gerlitz 16065e7ae7bSOr Gerlitz /** 16165e7ae7bSOr Gerlitz * iscsi_mtask_xmit - xmit management(immediate) task 16265e7ae7bSOr Gerlitz * @conn: iscsi connection 16365e7ae7bSOr Gerlitz * @mtask: task management task 16465e7ae7bSOr Gerlitz * 16565e7ae7bSOr Gerlitz * Notes: 16665e7ae7bSOr Gerlitz * The function can return -EAGAIN in which case caller must 16765e7ae7bSOr Gerlitz * call it again later, or recover. '0' return code means successful 16865e7ae7bSOr Gerlitz * xmit. 16965e7ae7bSOr Gerlitz * 17065e7ae7bSOr Gerlitz **/ 17165e7ae7bSOr Gerlitz static int 17265e7ae7bSOr Gerlitz iscsi_iser_mtask_xmit(struct iscsi_conn *conn, 17365e7ae7bSOr Gerlitz struct iscsi_mgmt_task *mtask) 17465e7ae7bSOr Gerlitz { 17565e7ae7bSOr Gerlitz int error = 0; 17665e7ae7bSOr Gerlitz 17765e7ae7bSOr Gerlitz debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id, mtask->itt); 17865e7ae7bSOr Gerlitz 17965e7ae7bSOr Gerlitz error = iser_send_control(conn, mtask); 18065e7ae7bSOr Gerlitz 18165e7ae7bSOr Gerlitz /* since iser xmits control with zero copy, mtasks can not be recycled 18265e7ae7bSOr Gerlitz * right after sending them. 18365e7ae7bSOr Gerlitz * The recycling scheme is based on whether a response is expected 18465e7ae7bSOr Gerlitz * - if yes, the mtask is recycled at iscsi_complete_pdu 18565e7ae7bSOr Gerlitz * - if no, the mtask is recycled at iser_snd_completion 18665e7ae7bSOr Gerlitz */ 18765e7ae7bSOr Gerlitz if (error && error != -EAGAIN) 18865e7ae7bSOr Gerlitz iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 18965e7ae7bSOr Gerlitz 19065e7ae7bSOr Gerlitz return error; 19165e7ae7bSOr Gerlitz } 19265e7ae7bSOr Gerlitz 19365e7ae7bSOr Gerlitz static int 19465e7ae7bSOr Gerlitz iscsi_iser_ctask_xmit_unsol_data(struct iscsi_conn *conn, 19565e7ae7bSOr Gerlitz struct iscsi_cmd_task *ctask) 19665e7ae7bSOr Gerlitz { 19765e7ae7bSOr Gerlitz struct iscsi_data hdr; 19865e7ae7bSOr Gerlitz int error = 0; 19965e7ae7bSOr Gerlitz struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; 20065e7ae7bSOr Gerlitz 20165e7ae7bSOr Gerlitz /* Send data-out PDUs while there's still unsolicited data to send */ 20265e7ae7bSOr Gerlitz while (ctask->unsol_count > 0) { 20365e7ae7bSOr Gerlitz iscsi_prep_unsolicit_data_pdu(ctask, &hdr, 20465e7ae7bSOr Gerlitz iser_ctask->rdma_data_count); 20565e7ae7bSOr Gerlitz 20665e7ae7bSOr Gerlitz debug_scsi("Sending data-out: itt 0x%x, data count %d\n", 20765e7ae7bSOr Gerlitz hdr.itt, ctask->data_count); 20865e7ae7bSOr Gerlitz 20965e7ae7bSOr Gerlitz /* the buffer description has been passed with the command */ 21065e7ae7bSOr Gerlitz /* Send the command */ 21165e7ae7bSOr Gerlitz error = iser_send_data_out(conn, ctask, &hdr); 21265e7ae7bSOr Gerlitz if (error) { 21365e7ae7bSOr Gerlitz ctask->unsol_datasn--; 21465e7ae7bSOr Gerlitz goto iscsi_iser_ctask_xmit_unsol_data_exit; 21565e7ae7bSOr Gerlitz } 21665e7ae7bSOr Gerlitz ctask->unsol_count -= ctask->data_count; 21765e7ae7bSOr Gerlitz debug_scsi("Need to send %d more as data-out PDUs\n", 21865e7ae7bSOr Gerlitz ctask->unsol_count); 21965e7ae7bSOr Gerlitz } 22065e7ae7bSOr Gerlitz 22165e7ae7bSOr Gerlitz iscsi_iser_ctask_xmit_unsol_data_exit: 22265e7ae7bSOr Gerlitz return error; 22365e7ae7bSOr Gerlitz } 22465e7ae7bSOr Gerlitz 22565e7ae7bSOr Gerlitz static int 22665e7ae7bSOr Gerlitz iscsi_iser_ctask_xmit(struct iscsi_conn *conn, 22765e7ae7bSOr Gerlitz struct iscsi_cmd_task *ctask) 22865e7ae7bSOr Gerlitz { 22965e7ae7bSOr Gerlitz struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; 23065e7ae7bSOr Gerlitz int error = 0; 23165e7ae7bSOr Gerlitz 23265e7ae7bSOr Gerlitz debug_scsi("ctask deq [cid %d itt 0x%x]\n", 23365e7ae7bSOr Gerlitz conn->id, ctask->itt); 23465e7ae7bSOr Gerlitz 23565e7ae7bSOr Gerlitz /* 23665e7ae7bSOr Gerlitz * serialize with TMF AbortTask 23765e7ae7bSOr Gerlitz */ 23865e7ae7bSOr Gerlitz if (ctask->mtask) 23965e7ae7bSOr Gerlitz return error; 24065e7ae7bSOr Gerlitz 24165e7ae7bSOr Gerlitz /* Send the cmd PDU */ 24265e7ae7bSOr Gerlitz if (!iser_ctask->command_sent) { 24365e7ae7bSOr Gerlitz error = iser_send_command(conn, ctask); 24465e7ae7bSOr Gerlitz if (error) 24565e7ae7bSOr Gerlitz goto iscsi_iser_ctask_xmit_exit; 24665e7ae7bSOr Gerlitz iser_ctask->command_sent = 1; 24765e7ae7bSOr Gerlitz } 24865e7ae7bSOr Gerlitz 24965e7ae7bSOr Gerlitz /* Send unsolicited data-out PDU(s) if necessary */ 25065e7ae7bSOr Gerlitz if (ctask->unsol_count) 25165e7ae7bSOr Gerlitz error = iscsi_iser_ctask_xmit_unsol_data(conn, ctask); 25265e7ae7bSOr Gerlitz 25365e7ae7bSOr Gerlitz iscsi_iser_ctask_xmit_exit: 25465e7ae7bSOr Gerlitz if (error && error != -EAGAIN) 25565e7ae7bSOr Gerlitz iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 25665e7ae7bSOr Gerlitz return error; 25765e7ae7bSOr Gerlitz } 25865e7ae7bSOr Gerlitz 25965e7ae7bSOr Gerlitz static void 26065e7ae7bSOr Gerlitz iscsi_iser_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) 26165e7ae7bSOr Gerlitz { 26265e7ae7bSOr Gerlitz struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; 26365e7ae7bSOr Gerlitz 26465e7ae7bSOr Gerlitz if (iser_ctask->status == ISER_TASK_STATUS_STARTED) { 26565e7ae7bSOr Gerlitz iser_ctask->status = ISER_TASK_STATUS_COMPLETED; 26665e7ae7bSOr Gerlitz iser_ctask_rdma_finalize(iser_ctask); 26765e7ae7bSOr Gerlitz } 26865e7ae7bSOr Gerlitz } 26965e7ae7bSOr Gerlitz 27065e7ae7bSOr Gerlitz static struct iser_conn * 27165e7ae7bSOr Gerlitz iscsi_iser_ib_conn_lookup(__u64 ep_handle) 27265e7ae7bSOr Gerlitz { 27365e7ae7bSOr Gerlitz struct iser_conn *ib_conn; 27465e7ae7bSOr Gerlitz struct iser_conn *uib_conn = (struct iser_conn *)(unsigned long)ep_handle; 27565e7ae7bSOr Gerlitz 27665e7ae7bSOr Gerlitz mutex_lock(&ig.connlist_mutex); 27765e7ae7bSOr Gerlitz list_for_each_entry(ib_conn, &ig.connlist, conn_list) { 27865e7ae7bSOr Gerlitz if (ib_conn == uib_conn) { 27965e7ae7bSOr Gerlitz mutex_unlock(&ig.connlist_mutex); 28065e7ae7bSOr Gerlitz return ib_conn; 28165e7ae7bSOr Gerlitz } 28265e7ae7bSOr Gerlitz } 28365e7ae7bSOr Gerlitz mutex_unlock(&ig.connlist_mutex); 28465e7ae7bSOr Gerlitz iser_err("no conn exists for eph %llx\n",(unsigned long long)ep_handle); 28565e7ae7bSOr Gerlitz return NULL; 28665e7ae7bSOr Gerlitz } 28765e7ae7bSOr Gerlitz 28865e7ae7bSOr Gerlitz static struct iscsi_cls_conn * 28965e7ae7bSOr Gerlitz iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 29065e7ae7bSOr Gerlitz { 29165e7ae7bSOr Gerlitz struct iscsi_conn *conn; 29265e7ae7bSOr Gerlitz struct iscsi_cls_conn *cls_conn; 29365e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn; 29465e7ae7bSOr Gerlitz 29565e7ae7bSOr Gerlitz cls_conn = iscsi_conn_setup(cls_session, conn_idx); 29665e7ae7bSOr Gerlitz if (!cls_conn) 29765e7ae7bSOr Gerlitz return NULL; 29865e7ae7bSOr Gerlitz conn = cls_conn->dd_data; 29965e7ae7bSOr Gerlitz 30065e7ae7bSOr Gerlitz /* 30165e7ae7bSOr Gerlitz * due to issues with the login code re iser sematics 30265e7ae7bSOr Gerlitz * this not set in iscsi_conn_setup - FIXME 30365e7ae7bSOr Gerlitz */ 30465e7ae7bSOr Gerlitz conn->max_recv_dlength = 128; 30565e7ae7bSOr Gerlitz 30665e7ae7bSOr Gerlitz iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL); 30765e7ae7bSOr Gerlitz if (!iser_conn) 30865e7ae7bSOr Gerlitz goto conn_alloc_fail; 30965e7ae7bSOr Gerlitz 31065e7ae7bSOr Gerlitz /* currently this is the only field which need to be initiated */ 31165e7ae7bSOr Gerlitz rwlock_init(&iser_conn->lock); 31265e7ae7bSOr Gerlitz 31365e7ae7bSOr Gerlitz conn->dd_data = iser_conn; 31465e7ae7bSOr Gerlitz iser_conn->iscsi_conn = conn; 31565e7ae7bSOr Gerlitz 31665e7ae7bSOr Gerlitz return cls_conn; 31765e7ae7bSOr Gerlitz 31865e7ae7bSOr Gerlitz conn_alloc_fail: 31965e7ae7bSOr Gerlitz iscsi_conn_teardown(cls_conn); 32065e7ae7bSOr Gerlitz return NULL; 32165e7ae7bSOr Gerlitz } 32265e7ae7bSOr Gerlitz 32365e7ae7bSOr Gerlitz static void 32465e7ae7bSOr Gerlitz iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) 32565e7ae7bSOr Gerlitz { 32665e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 32765e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn = conn->dd_data; 32865e7ae7bSOr Gerlitz 32965e7ae7bSOr Gerlitz iscsi_conn_teardown(cls_conn); 33065e7ae7bSOr Gerlitz kfree(iser_conn); 33165e7ae7bSOr Gerlitz } 33265e7ae7bSOr Gerlitz 33365e7ae7bSOr Gerlitz static int 33465e7ae7bSOr Gerlitz iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 33565e7ae7bSOr Gerlitz struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, 33665e7ae7bSOr Gerlitz int is_leading) 33765e7ae7bSOr Gerlitz { 33865e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 33965e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn; 34065e7ae7bSOr Gerlitz struct iser_conn *ib_conn; 34165e7ae7bSOr Gerlitz int error; 34265e7ae7bSOr Gerlitz 34365e7ae7bSOr Gerlitz error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 34465e7ae7bSOr Gerlitz if (error) 34565e7ae7bSOr Gerlitz return error; 34665e7ae7bSOr Gerlitz 34765e7ae7bSOr Gerlitz /* the transport ep handle comes from user space so it must be 34865e7ae7bSOr Gerlitz * verified against the global ib connections list */ 34965e7ae7bSOr Gerlitz ib_conn = iscsi_iser_ib_conn_lookup(transport_eph); 35065e7ae7bSOr Gerlitz if (!ib_conn) { 35165e7ae7bSOr Gerlitz iser_err("can't bind eph %llx\n", 35265e7ae7bSOr Gerlitz (unsigned long long)transport_eph); 35365e7ae7bSOr Gerlitz return -EINVAL; 35465e7ae7bSOr Gerlitz } 35565e7ae7bSOr Gerlitz /* binds the iSER connection retrieved from the previously 35665e7ae7bSOr Gerlitz * connected ep_handle to the iSCSI layer connection. exchanges 35765e7ae7bSOr Gerlitz * connection pointers */ 35865e7ae7bSOr Gerlitz iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn); 35965e7ae7bSOr Gerlitz iser_conn = conn->dd_data; 36065e7ae7bSOr Gerlitz ib_conn->iser_conn = iser_conn; 36165e7ae7bSOr Gerlitz iser_conn->ib_conn = ib_conn; 36265e7ae7bSOr Gerlitz 36365e7ae7bSOr Gerlitz conn->recv_lock = &iser_conn->lock; 36465e7ae7bSOr Gerlitz 36565e7ae7bSOr Gerlitz return 0; 36665e7ae7bSOr Gerlitz } 36765e7ae7bSOr Gerlitz 36865e7ae7bSOr Gerlitz static int 36965e7ae7bSOr Gerlitz iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 37065e7ae7bSOr Gerlitz { 37165e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 37265e7ae7bSOr Gerlitz int err; 37365e7ae7bSOr Gerlitz 37465e7ae7bSOr Gerlitz err = iscsi_conn_start(cls_conn); 37565e7ae7bSOr Gerlitz if (err) 37665e7ae7bSOr Gerlitz return err; 37765e7ae7bSOr Gerlitz 37865e7ae7bSOr Gerlitz return iser_conn_set_full_featured_mode(conn); 37965e7ae7bSOr Gerlitz } 38065e7ae7bSOr Gerlitz 38165e7ae7bSOr Gerlitz static struct iscsi_transport iscsi_iser_transport; 38265e7ae7bSOr Gerlitz 38365e7ae7bSOr Gerlitz static struct iscsi_cls_session * 38465e7ae7bSOr Gerlitz iscsi_iser_session_create(struct iscsi_transport *iscsit, 38565e7ae7bSOr Gerlitz struct scsi_transport_template *scsit, 38665e7ae7bSOr Gerlitz uint32_t initial_cmdsn, uint32_t *hostno) 38765e7ae7bSOr Gerlitz { 38865e7ae7bSOr Gerlitz struct iscsi_cls_session *cls_session; 38965e7ae7bSOr Gerlitz struct iscsi_session *session; 39065e7ae7bSOr Gerlitz int i; 39165e7ae7bSOr Gerlitz uint32_t hn; 39265e7ae7bSOr Gerlitz struct iscsi_cmd_task *ctask; 39365e7ae7bSOr Gerlitz struct iscsi_mgmt_task *mtask; 39465e7ae7bSOr Gerlitz struct iscsi_iser_cmd_task *iser_ctask; 39565e7ae7bSOr Gerlitz struct iser_desc *desc; 39665e7ae7bSOr Gerlitz 39765e7ae7bSOr Gerlitz cls_session = iscsi_session_setup(iscsit, scsit, 39865e7ae7bSOr Gerlitz sizeof(struct iscsi_iser_cmd_task), 39965e7ae7bSOr Gerlitz sizeof(struct iser_desc), 40065e7ae7bSOr Gerlitz initial_cmdsn, &hn); 40165e7ae7bSOr Gerlitz if (!cls_session) 40265e7ae7bSOr Gerlitz return NULL; 40365e7ae7bSOr Gerlitz 40465e7ae7bSOr Gerlitz *hostno = hn; 40565e7ae7bSOr Gerlitz session = class_to_transport_session(cls_session); 40665e7ae7bSOr Gerlitz 40765e7ae7bSOr Gerlitz /* libiscsi setup itts, data and pool so just set desc fields */ 40865e7ae7bSOr Gerlitz for (i = 0; i < session->cmds_max; i++) { 40965e7ae7bSOr Gerlitz ctask = session->cmds[i]; 41065e7ae7bSOr Gerlitz iser_ctask = ctask->dd_data; 41165e7ae7bSOr Gerlitz ctask->hdr = (struct iscsi_cmd *)&iser_ctask->desc.iscsi_header; 41265e7ae7bSOr Gerlitz } 41365e7ae7bSOr Gerlitz 41465e7ae7bSOr Gerlitz for (i = 0; i < session->mgmtpool_max; i++) { 41565e7ae7bSOr Gerlitz mtask = session->mgmt_cmds[i]; 41665e7ae7bSOr Gerlitz desc = mtask->dd_data; 41765e7ae7bSOr Gerlitz mtask->hdr = &desc->iscsi_header; 41865e7ae7bSOr Gerlitz desc->data = mtask->data; 41965e7ae7bSOr Gerlitz } 42065e7ae7bSOr Gerlitz 42165e7ae7bSOr Gerlitz return cls_session; 42265e7ae7bSOr Gerlitz } 42365e7ae7bSOr Gerlitz 42465e7ae7bSOr Gerlitz static int 425358ff019SMike Christie iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 426358ff019SMike Christie enum iscsi_param param, char *buf, int buflen) 42765e7ae7bSOr Gerlitz { 428358ff019SMike Christie int value; 42965e7ae7bSOr Gerlitz 43065e7ae7bSOr Gerlitz switch (param) { 43165e7ae7bSOr Gerlitz case ISCSI_PARAM_MAX_RECV_DLENGTH: 43265e7ae7bSOr Gerlitz /* TBD */ 43365e7ae7bSOr Gerlitz break; 43465e7ae7bSOr Gerlitz case ISCSI_PARAM_HDRDGST_EN: 435358ff019SMike Christie sscanf(buf, "%d", &value); 43665e7ae7bSOr Gerlitz if (value) { 43765e7ae7bSOr Gerlitz printk(KERN_ERR "DataDigest wasn't negotiated to None"); 43865e7ae7bSOr Gerlitz return -EPROTO; 43965e7ae7bSOr Gerlitz } 44065e7ae7bSOr Gerlitz break; 44165e7ae7bSOr Gerlitz case ISCSI_PARAM_DATADGST_EN: 442358ff019SMike Christie sscanf(buf, "%d", &value); 44365e7ae7bSOr Gerlitz if (value) { 44465e7ae7bSOr Gerlitz printk(KERN_ERR "DataDigest wasn't negotiated to None"); 44565e7ae7bSOr Gerlitz return -EPROTO; 44665e7ae7bSOr Gerlitz } 44765e7ae7bSOr Gerlitz break; 44865e7ae7bSOr Gerlitz case ISCSI_PARAM_IFMARKER_EN: 449358ff019SMike Christie sscanf(buf, "%d", &value); 45065e7ae7bSOr Gerlitz if (value) { 45165e7ae7bSOr Gerlitz printk(KERN_ERR "IFMarker wasn't negotiated to No"); 45265e7ae7bSOr Gerlitz return -EPROTO; 45365e7ae7bSOr Gerlitz } 45465e7ae7bSOr Gerlitz break; 45565e7ae7bSOr Gerlitz case ISCSI_PARAM_OFMARKER_EN: 456358ff019SMike Christie sscanf(buf, "%d", &value); 45765e7ae7bSOr Gerlitz if (value) { 45865e7ae7bSOr Gerlitz printk(KERN_ERR "OFMarker wasn't negotiated to No"); 45965e7ae7bSOr Gerlitz return -EPROTO; 46065e7ae7bSOr Gerlitz } 46165e7ae7bSOr Gerlitz break; 46265e7ae7bSOr Gerlitz default: 463358ff019SMike Christie return iscsi_set_param(cls_conn, param, buf, buflen); 46465e7ae7bSOr Gerlitz } 46565e7ae7bSOr Gerlitz 46665e7ae7bSOr Gerlitz return 0; 46765e7ae7bSOr Gerlitz } 46865e7ae7bSOr Gerlitz 46965e7ae7bSOr Gerlitz static void 47065e7ae7bSOr Gerlitz iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 47165e7ae7bSOr Gerlitz { 47265e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 47365e7ae7bSOr Gerlitz 47465e7ae7bSOr Gerlitz stats->txdata_octets = conn->txdata_octets; 47565e7ae7bSOr Gerlitz stats->rxdata_octets = conn->rxdata_octets; 47665e7ae7bSOr Gerlitz stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 47765e7ae7bSOr Gerlitz stats->dataout_pdus = conn->dataout_pdus_cnt; 47865e7ae7bSOr Gerlitz stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 47965e7ae7bSOr Gerlitz stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 48065e7ae7bSOr Gerlitz stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 48165e7ae7bSOr Gerlitz stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 48265e7ae7bSOr Gerlitz stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 48365e7ae7bSOr Gerlitz stats->custom_length = 3; 48465e7ae7bSOr Gerlitz strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 48565e7ae7bSOr Gerlitz stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 48665e7ae7bSOr Gerlitz strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 48765e7ae7bSOr Gerlitz stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 48865e7ae7bSOr Gerlitz strcpy(stats->custom[2].desc, "eh_abort_cnt"); 48965e7ae7bSOr Gerlitz stats->custom[2].value = conn->eh_abort_cnt; 49065e7ae7bSOr Gerlitz } 49165e7ae7bSOr Gerlitz 49265e7ae7bSOr Gerlitz static int 49365e7ae7bSOr Gerlitz iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking, 49465e7ae7bSOr Gerlitz __u64 *ep_handle) 49565e7ae7bSOr Gerlitz { 49665e7ae7bSOr Gerlitz int err; 49765e7ae7bSOr Gerlitz struct iser_conn *ib_conn; 49865e7ae7bSOr Gerlitz 49965e7ae7bSOr Gerlitz err = iser_conn_init(&ib_conn); 50065e7ae7bSOr Gerlitz if (err) 50165e7ae7bSOr Gerlitz goto out; 50265e7ae7bSOr Gerlitz 50365e7ae7bSOr Gerlitz err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, non_blocking); 50465e7ae7bSOr Gerlitz if (!err) 50565e7ae7bSOr Gerlitz *ep_handle = (__u64)(unsigned long)ib_conn; 50665e7ae7bSOr Gerlitz 50765e7ae7bSOr Gerlitz out: 50865e7ae7bSOr Gerlitz return err; 50965e7ae7bSOr Gerlitz } 51065e7ae7bSOr Gerlitz 51165e7ae7bSOr Gerlitz static int 51265e7ae7bSOr Gerlitz iscsi_iser_ep_poll(__u64 ep_handle, int timeout_ms) 51365e7ae7bSOr Gerlitz { 51465e7ae7bSOr Gerlitz struct iser_conn *ib_conn = iscsi_iser_ib_conn_lookup(ep_handle); 51565e7ae7bSOr Gerlitz int rc; 51665e7ae7bSOr Gerlitz 51765e7ae7bSOr Gerlitz if (!ib_conn) 51865e7ae7bSOr Gerlitz return -EINVAL; 51965e7ae7bSOr Gerlitz 52065e7ae7bSOr Gerlitz rc = wait_event_interruptible_timeout(ib_conn->wait, 52165e7ae7bSOr Gerlitz ib_conn->state == ISER_CONN_UP, 52265e7ae7bSOr Gerlitz msecs_to_jiffies(timeout_ms)); 52365e7ae7bSOr Gerlitz 52465e7ae7bSOr Gerlitz /* if conn establishment failed, return error code to iscsi */ 52565e7ae7bSOr Gerlitz if (!rc && 52665e7ae7bSOr Gerlitz (ib_conn->state == ISER_CONN_TERMINATING || 52765e7ae7bSOr Gerlitz ib_conn->state == ISER_CONN_DOWN)) 52865e7ae7bSOr Gerlitz rc = -1; 52965e7ae7bSOr Gerlitz 53065e7ae7bSOr Gerlitz iser_err("ib conn %p rc = %d\n", ib_conn, rc); 53165e7ae7bSOr Gerlitz 53265e7ae7bSOr Gerlitz if (rc > 0) 53365e7ae7bSOr Gerlitz return 1; /* success, this is the equivalent of POLLOUT */ 53465e7ae7bSOr Gerlitz else if (!rc) 53565e7ae7bSOr Gerlitz return 0; /* timeout */ 53665e7ae7bSOr Gerlitz else 53765e7ae7bSOr Gerlitz return rc; /* signal */ 53865e7ae7bSOr Gerlitz } 53965e7ae7bSOr Gerlitz 54065e7ae7bSOr Gerlitz static void 54165e7ae7bSOr Gerlitz iscsi_iser_ep_disconnect(__u64 ep_handle) 54265e7ae7bSOr Gerlitz { 5431c83469dSMike Christie struct iser_conn *ib_conn; 54465e7ae7bSOr Gerlitz 5451c83469dSMike Christie ib_conn = iscsi_iser_ib_conn_lookup(ep_handle); 54665e7ae7bSOr Gerlitz if (!ib_conn) 54765e7ae7bSOr Gerlitz return; 54865e7ae7bSOr Gerlitz 54965e7ae7bSOr Gerlitz iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); 55065e7ae7bSOr Gerlitz iser_conn_terminate(ib_conn); 55165e7ae7bSOr Gerlitz } 55265e7ae7bSOr Gerlitz 55365e7ae7bSOr Gerlitz static struct scsi_host_template iscsi_iser_sht = { 55465e7ae7bSOr Gerlitz .name = "iSCSI Initiator over iSER, v." DRV_VER, 55565e7ae7bSOr Gerlitz .queuecommand = iscsi_queuecommand, 55665e7ae7bSOr Gerlitz .can_queue = ISCSI_XMIT_CMDS_MAX - 1, 55765e7ae7bSOr Gerlitz .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 5588072ec2fSErez Zilber .max_sectors = 1024, 55965e7ae7bSOr Gerlitz .cmd_per_lun = ISCSI_MAX_CMD_PER_LUN, 56065e7ae7bSOr Gerlitz .eh_abort_handler = iscsi_eh_abort, 56165e7ae7bSOr Gerlitz .eh_host_reset_handler = iscsi_eh_host_reset, 56265e7ae7bSOr Gerlitz .use_clustering = DISABLE_CLUSTERING, 56365e7ae7bSOr Gerlitz .proc_name = "iscsi_iser", 56465e7ae7bSOr Gerlitz .this_id = -1, 56565e7ae7bSOr Gerlitz }; 56665e7ae7bSOr Gerlitz 56765e7ae7bSOr Gerlitz static struct iscsi_transport iscsi_iser_transport = { 56865e7ae7bSOr Gerlitz .owner = THIS_MODULE, 56965e7ae7bSOr Gerlitz .name = "iser", 57065e7ae7bSOr Gerlitz .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, 57165e7ae7bSOr Gerlitz .param_mask = ISCSI_MAX_RECV_DLENGTH | 57265e7ae7bSOr Gerlitz ISCSI_MAX_XMIT_DLENGTH | 57365e7ae7bSOr Gerlitz ISCSI_HDRDGST_EN | 57465e7ae7bSOr Gerlitz ISCSI_DATADGST_EN | 57565e7ae7bSOr Gerlitz ISCSI_INITIAL_R2T_EN | 57665e7ae7bSOr Gerlitz ISCSI_MAX_R2T | 57765e7ae7bSOr Gerlitz ISCSI_IMM_DATA_EN | 57865e7ae7bSOr Gerlitz ISCSI_FIRST_BURST | 57965e7ae7bSOr Gerlitz ISCSI_MAX_BURST | 58065e7ae7bSOr Gerlitz ISCSI_PDU_INORDER_EN | 581358ff019SMike Christie ISCSI_DATASEQ_INORDER_EN | 582358ff019SMike Christie ISCSI_EXP_STATSN | 583358ff019SMike Christie ISCSI_PERSISTENT_PORT | 584358ff019SMike Christie ISCSI_PERSISTENT_ADDRESS | 585358ff019SMike Christie ISCSI_TARGET_NAME | 586358ff019SMike Christie ISCSI_TPGT, 58765e7ae7bSOr Gerlitz .host_template = &iscsi_iser_sht, 58865e7ae7bSOr Gerlitz .conndata_size = sizeof(struct iscsi_conn), 58965e7ae7bSOr Gerlitz .max_lun = ISCSI_ISER_MAX_LUN, 59065e7ae7bSOr Gerlitz .max_cmd_len = ISCSI_ISER_MAX_CMD_LEN, 59165e7ae7bSOr Gerlitz /* session management */ 59265e7ae7bSOr Gerlitz .create_session = iscsi_iser_session_create, 59365e7ae7bSOr Gerlitz .destroy_session = iscsi_session_teardown, 59465e7ae7bSOr Gerlitz /* connection management */ 59565e7ae7bSOr Gerlitz .create_conn = iscsi_iser_conn_create, 59665e7ae7bSOr Gerlitz .bind_conn = iscsi_iser_conn_bind, 59765e7ae7bSOr Gerlitz .destroy_conn = iscsi_iser_conn_destroy, 598358ff019SMike Christie .set_param = iscsi_iser_set_param, 599358ff019SMike Christie .get_conn_param = iscsi_conn_get_param, 600358ff019SMike Christie .get_session_param = iscsi_session_get_param, 60165e7ae7bSOr Gerlitz .start_conn = iscsi_iser_conn_start, 60265e7ae7bSOr Gerlitz .stop_conn = iscsi_conn_stop, 60365e7ae7bSOr Gerlitz /* IO */ 60465e7ae7bSOr Gerlitz .send_pdu = iscsi_conn_send_pdu, 60565e7ae7bSOr Gerlitz .get_stats = iscsi_iser_conn_get_stats, 60665e7ae7bSOr Gerlitz .init_cmd_task = iscsi_iser_cmd_init, 60765e7ae7bSOr Gerlitz .xmit_cmd_task = iscsi_iser_ctask_xmit, 60865e7ae7bSOr Gerlitz .xmit_mgmt_task = iscsi_iser_mtask_xmit, 60965e7ae7bSOr Gerlitz .cleanup_cmd_task = iscsi_iser_cleanup_ctask, 61065e7ae7bSOr Gerlitz /* recovery */ 61165e7ae7bSOr Gerlitz .session_recovery_timedout = iscsi_session_recovery_timedout, 61265e7ae7bSOr Gerlitz 61365e7ae7bSOr Gerlitz .ep_connect = iscsi_iser_ep_connect, 61465e7ae7bSOr Gerlitz .ep_poll = iscsi_iser_ep_poll, 61565e7ae7bSOr Gerlitz .ep_disconnect = iscsi_iser_ep_disconnect 61665e7ae7bSOr Gerlitz }; 61765e7ae7bSOr Gerlitz 61865e7ae7bSOr Gerlitz static int __init iser_init(void) 61965e7ae7bSOr Gerlitz { 62065e7ae7bSOr Gerlitz int err; 62165e7ae7bSOr Gerlitz 62265e7ae7bSOr Gerlitz iser_dbg("Starting iSER datamover...\n"); 62365e7ae7bSOr Gerlitz 62465e7ae7bSOr Gerlitz if (iscsi_max_lun < 1) { 62565e7ae7bSOr Gerlitz printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); 62665e7ae7bSOr Gerlitz return -EINVAL; 62765e7ae7bSOr Gerlitz } 62865e7ae7bSOr Gerlitz 62965e7ae7bSOr Gerlitz iscsi_iser_transport.max_lun = iscsi_max_lun; 63065e7ae7bSOr Gerlitz 63165e7ae7bSOr Gerlitz memset(&ig, 0, sizeof(struct iser_global)); 63265e7ae7bSOr Gerlitz 63365e7ae7bSOr Gerlitz ig.desc_cache = kmem_cache_create("iser_descriptors", 63465e7ae7bSOr Gerlitz sizeof (struct iser_desc), 63565e7ae7bSOr Gerlitz 0, SLAB_HWCACHE_ALIGN, 63665e7ae7bSOr Gerlitz NULL, NULL); 63765e7ae7bSOr Gerlitz if (ig.desc_cache == NULL) 63865e7ae7bSOr Gerlitz return -ENOMEM; 63965e7ae7bSOr Gerlitz 64065e7ae7bSOr Gerlitz /* device init is called only after the first addr resolution */ 64165e7ae7bSOr Gerlitz mutex_init(&ig.device_list_mutex); 64265e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.device_list); 64365e7ae7bSOr Gerlitz mutex_init(&ig.connlist_mutex); 64465e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.connlist); 64565e7ae7bSOr Gerlitz 64665e7ae7bSOr Gerlitz if (!iscsi_register_transport(&iscsi_iser_transport)) { 64765e7ae7bSOr Gerlitz iser_err("iscsi_register_transport failed\n"); 64865e7ae7bSOr Gerlitz err = -EINVAL; 64965e7ae7bSOr Gerlitz goto register_transport_failure; 65065e7ae7bSOr Gerlitz } 65165e7ae7bSOr Gerlitz 65265e7ae7bSOr Gerlitz return 0; 65365e7ae7bSOr Gerlitz 65465e7ae7bSOr Gerlitz register_transport_failure: 65565e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 65665e7ae7bSOr Gerlitz 65765e7ae7bSOr Gerlitz return err; 65865e7ae7bSOr Gerlitz } 65965e7ae7bSOr Gerlitz 66065e7ae7bSOr Gerlitz static void __exit iser_exit(void) 66165e7ae7bSOr Gerlitz { 66265e7ae7bSOr Gerlitz iser_dbg("Removing iSER datamover...\n"); 66365e7ae7bSOr Gerlitz iscsi_unregister_transport(&iscsi_iser_transport); 66465e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 66565e7ae7bSOr Gerlitz } 66665e7ae7bSOr Gerlitz 66765e7ae7bSOr Gerlitz module_init(iser_init); 66865e7ae7bSOr Gerlitz module_exit(iser_exit); 669