| /* |
| * iSCSI Initiator over iSER Data-Path |
| * |
| * Copyright (C) 2004 Dmitry Yusupov |
| * Copyright (C) 2004 Alex Aizman |
| * Copyright (C) 2005 Mike Christie |
| * Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved. |
| * maintained by openib-general@openib.org |
| * |
| * This software is available to you under a choice of one of two |
| * licenses. You may choose to be licensed under the terms of the GNU |
| * General Public License (GPL) Version 2, available from the file |
| * COPYING in the main directory of this source tree, or the |
| * OpenIB.org BSD license below: |
| * |
| * Redistribution and use in source and binary forms, with or |
| * without modification, are permitted provided that the following |
| * conditions are met: |
| * |
| * - Redistributions of source code must retain the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials |
| * provided with the distribution. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| * |
| * Credits: |
| * Christoph Hellwig |
| * FUJITA Tomonori |
| * Arne Redlich |
| * Zhenyu Wang |
| * Modified by: |
| * Erez Zilber |
| * |
| * |
| * $Id: iscsi_iser.c 6965 2006-05-07 11:36:20Z ogerlitz $ |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/list.h> |
| #include <linux/hardirq.h> |
| #include <linux/kfifo.h> |
| #include <linux/blkdev.h> |
| #include <linux/init.h> |
| #include <linux/ioctl.h> |
| #include <linux/cdev.h> |
| #include <linux/in.h> |
| #include <linux/net.h> |
| #include <linux/scatterlist.h> |
| #include <linux/delay.h> |
| |
| #include <net/sock.h> |
| |
| #include <asm/uaccess.h> |
| |
| #include <scsi/scsi_cmnd.h> |
| #include <scsi/scsi_device.h> |
| #include <scsi/scsi_eh.h> |
| #include <scsi/scsi_tcq.h> |
| #include <scsi/scsi_host.h> |
| #include <scsi/scsi.h> |
| #include <scsi/scsi_transport_iscsi.h> |
| |
| #include "iscsi_iser.h" |
| |
| static unsigned int iscsi_max_lun = 512; |
| module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); |
| |
| int iser_debug_level = 0; |
| |
| MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover " |
| "v" DRV_VER " (" DRV_DATE ")"); |
| MODULE_LICENSE("Dual BSD/GPL"); |
| MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); |
| |
| module_param_named(debug_level, iser_debug_level, int, 0644); |
| MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); |
| |
| struct iser_global ig; |
| |
| void |
| iscsi_iser_recv(struct iscsi_conn *conn, |
| struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) |
| { |
| int rc = 0; |
| uint32_t ret_itt; |
| int datalen; |
| int ahslen; |
| |
| /* verify PDU length */ |
| datalen = ntoh24(hdr->dlength); |
| if (datalen != rx_data_len) { |
| printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n", |
| datalen, rx_data_len); |
| rc = ISCSI_ERR_DATALEN; |
| goto error; |
| } |
| |
| /* read AHS */ |
| ahslen = hdr->hlength * 4; |
| |
| /* verify itt (itt encoding: age+cid+itt) */ |
| rc = iscsi_verify_itt(conn, hdr, &ret_itt); |
| |
| if (!rc) |
| rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); |
| |
| if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) |
| goto error; |
| |
| return; |
| error: |
| iscsi_conn_failure(conn, rc); |
| } |
| |
| |
| /** |
| * iscsi_iser_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands |
| * |
| **/ |
| static int |
| iscsi_iser_cmd_init(struct iscsi_cmd_task *ctask) |
| { |
| struct iscsi_iser_conn *iser_conn = ctask->conn->dd_data; |
| struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; |
| |
| iser_ctask->command_sent = 0; |
| iser_ctask->iser_conn = iser_conn; |
| iser_ctask_rdma_init(iser_ctask); |
| return 0; |
| } |
| |
| /** |
| * iscsi_mtask_xmit - xmit management(immediate) task |
| * @conn: iscsi connection |
| * @mtask: task management task |
| * |
| * Notes: |
| * The function can return -EAGAIN in which case caller must |
| * call it again later, or recover. '0' return code means successful |
| * xmit. |
| * |
| **/ |
| static int |
| iscsi_iser_mtask_xmit(struct iscsi_conn *conn, |
| struct iscsi_mgmt_task *mtask) |
| { |
| int error = 0; |
| |
| debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id, mtask->itt); |
| |
| error = iser_send_control(conn, mtask); |
| |
| /* since iser xmits control with zero copy, mtasks can not be recycled |
| * right after sending them. |
| * The recycling scheme is based on whether a response is expected |
| * - if yes, the mtask is recycled at iscsi_complete_pdu |
| * - if no, the mtask is recycled at iser_snd_completion |
| */ |
| if (error && error != -ENOBUFS) |
| iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| |
| return error; |
| } |
| |
| static int |
| iscsi_iser_ctask_xmit_unsol_data(struct iscsi_conn *conn, |
| struct iscsi_cmd_task *ctask) |
| { |
| struct iscsi_data hdr; |
| int error = 0; |
| |
| /* Send data-out PDUs while there's still unsolicited data to send */ |
| while (ctask->unsol_count > 0) { |
| iscsi_prep_unsolicit_data_pdu(ctask, &hdr); |
| debug_scsi("Sending data-out: itt 0x%x, data count %d\n", |
| hdr.itt, ctask->data_count); |
| |
| /* the buffer description has been passed with the command */ |
| /* Send the command */ |
| error = iser_send_data_out(conn, ctask, &hdr); |
| if (error) { |
| ctask->unsol_datasn--; |
| goto iscsi_iser_ctask_xmit_unsol_data_exit; |
| } |
| ctask->unsol_count -= ctask->data_count; |
| debug_scsi("Need to send %d more as data-out PDUs\n", |
| ctask->unsol_count); |
| } |
| |
| iscsi_iser_ctask_xmit_unsol_data_exit: |
| return error; |
| } |
| |
| static int |
| iscsi_iser_ctask_xmit(struct iscsi_conn *conn, |
| struct iscsi_cmd_task *ctask) |
| { |
| struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; |
| int error = 0; |
| |
| if (ctask->sc->sc_data_direction == DMA_TO_DEVICE) { |
| BUG_ON(scsi_bufflen(ctask->sc) == 0); |
| |
| debug_scsi("cmd [itt %x total %d imm %d unsol_data %d\n", |
| ctask->itt, scsi_bufflen(ctask->sc), |
| ctask->imm_count, ctask->unsol_count); |
| } |
| |
| debug_scsi("ctask deq [cid %d itt 0x%x]\n", |
| conn->id, ctask->itt); |
| |
| /* Send the cmd PDU */ |
| if (!iser_ctask->command_sent) { |
| error = iser_send_command(conn, ctask); |
| if (error) |
| goto iscsi_iser_ctask_xmit_exit; |
| iser_ctask->command_sent = 1; |
| } |
| |
| /* Send unsolicited data-out PDU(s) if necessary */ |
| if (ctask->unsol_count) |
| error = iscsi_iser_ctask_xmit_unsol_data(conn, ctask); |
| |
| iscsi_iser_ctask_xmit_exit: |
| if (error && error != -ENOBUFS) |
| iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| return error; |
| } |
| |
| static void |
| iscsi_iser_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
| { |
| struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; |
| |
| if (iser_ctask->status == ISER_TASK_STATUS_STARTED) { |
| iser_ctask->status = ISER_TASK_STATUS_COMPLETED; |
| iser_ctask_rdma_finalize(iser_ctask); |
| } |
| } |
| |
| static struct iser_conn * |
| iscsi_iser_ib_conn_lookup(__u64 ep_handle) |
| { |
| struct iser_conn *ib_conn; |
| struct iser_conn *uib_conn = (struct iser_conn *)(unsigned long)ep_handle; |
| |
| mutex_lock(&ig.connlist_mutex); |
| list_for_each_entry(ib_conn, &ig.connlist, conn_list) { |
| if (ib_conn == uib_conn) { |
| mutex_unlock(&ig.connlist_mutex); |
| return ib_conn; |
| } |
| } |
| mutex_unlock(&ig.connlist_mutex); |
| iser_err("no conn exists for eph %llx\n",(unsigned long long)ep_handle); |
| return NULL; |
| } |
| |
| static struct iscsi_cls_conn * |
| iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) |
| { |
| struct iscsi_conn *conn; |
| struct iscsi_cls_conn *cls_conn; |
| struct iscsi_iser_conn *iser_conn; |
| |
| cls_conn = iscsi_conn_setup(cls_session, conn_idx); |
| if (!cls_conn) |
| return NULL; |
| conn = cls_conn->dd_data; |
| |
| /* |
| * due to issues with the login code re iser sematics |
| * this not set in iscsi_conn_setup - FIXME |
| */ |
| conn->max_recv_dlength = 128; |
| |
| iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL); |
| if (!iser_conn) |
| goto conn_alloc_fail; |
| |
| /* currently this is the only field which need to be initiated */ |
| rwlock_init(&iser_conn->lock); |
| |
| conn->dd_data = iser_conn; |
| iser_conn->iscsi_conn = conn; |
| |
| return cls_conn; |
| |
| conn_alloc_fail: |
| iscsi_conn_teardown(cls_conn); |
| return NULL; |
| } |
| |
| static void |
| iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) |
| { |
| struct iscsi_conn *conn = cls_conn->dd_data; |
| struct iscsi_iser_conn *iser_conn = conn->dd_data; |
| |
| iscsi_conn_teardown(cls_conn); |
| if (iser_conn->ib_conn) |
| iser_conn->ib_conn->iser_conn = NULL; |
| kfree(iser_conn); |
| } |
| |
| static int |
| iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, |
| struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
| int is_leading) |
| { |
| struct iscsi_conn *conn = cls_conn->dd_data; |
| struct iscsi_iser_conn *iser_conn; |
| struct iser_conn *ib_conn; |
| int error; |
| |
| error = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
| if (error) |
| return error; |
| |
| /* the transport ep handle comes from user space so it must be |
| * verified against the global ib connections list */ |
| ib_conn = iscsi_iser_ib_conn_lookup(transport_eph); |
| if (!ib_conn) { |
| iser_err("can't bind eph %llx\n", |
| (unsigned long long)transport_eph); |
| return -EINVAL; |
| } |
| /* binds the iSER connection retrieved from the previously |
| * connected ep_handle to the iSCSI layer connection. exchanges |
| * connection pointers */ |
| iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn); |
| iser_conn = conn->dd_data; |
| ib_conn->iser_conn = iser_conn; |
| iser_conn->ib_conn = ib_conn; |
| |
| conn->recv_lock = &iser_conn->lock; |
| |
| return 0; |
| } |
| |
| static int |
| iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) |
| { |
| struct iscsi_conn *conn = cls_conn->dd_data; |
| int err; |
| |
| err = iser_conn_set_full_featured_mode(conn); |
| if (err) |
| return err; |
| |
| return iscsi_conn_start(cls_conn); |
| } |
| |
| static struct iscsi_transport iscsi_iser_transport; |
| |
| static struct iscsi_cls_session * |
| iscsi_iser_session_create(struct iscsi_transport *iscsit, |
| struct scsi_transport_template *scsit, |
| uint16_t cmds_max, uint16_t qdepth, |
| uint32_t initial_cmdsn, uint32_t *hostno) |
| { |
| struct iscsi_cls_session *cls_session; |
| struct iscsi_session *session; |
| int i; |
| uint32_t hn; |
| struct iscsi_cmd_task *ctask; |
| struct iscsi_mgmt_task *mtask; |
| struct iscsi_iser_cmd_task *iser_ctask; |
| struct iser_desc *desc; |
| |
| /* |
| * we do not support setting can_queue cmd_per_lun from userspace yet |
| * because we preallocate so many resources |
| */ |
| cls_session = iscsi_session_setup(iscsit, scsit, |
| ISCSI_DEF_XMIT_CMDS_MAX, |
| ISCSI_MAX_CMD_PER_LUN, |
| sizeof(struct iscsi_iser_cmd_task), |
| sizeof(struct iser_desc), |
| initial_cmdsn, &hn); |
| if (!cls_session) |
| return NULL; |
| |
| *hostno = hn; |
| session = class_to_transport_session(cls_session); |
| |
| /* libiscsi setup itts, data and pool so just set desc fields */ |
| for (i = 0; i < session->cmds_max; i++) { |
| ctask = session->cmds[i]; |
| iser_ctask = ctask->dd_data; |
| ctask->hdr = (struct iscsi_cmd *)&iser_ctask->desc.iscsi_header; |
| ctask->hdr_max = sizeof(iser_ctask->desc.iscsi_header); |
| } |
| |
| for (i = 0; i < session->mgmtpool_max; i++) { |
| mtask = session->mgmt_cmds[i]; |
| desc = mtask->dd_data; |
| mtask->hdr = &desc->iscsi_header; |
| desc->data = mtask->data; |
| } |
| |
| return cls_session; |
| } |
| |
| static int |
| iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, |
| enum iscsi_param param, char *buf, int buflen) |
| { |
| int value; |
| |
| switch (param) { |
| case ISCSI_PARAM_MAX_RECV_DLENGTH: |
| /* TBD */ |
| break; |
| case ISCSI_PARAM_HDRDGST_EN: |
| sscanf(buf, "%d", &value); |
| if (value) { |
| printk(KERN_ERR "DataDigest wasn't negotiated to None"); |
| return -EPROTO; |
| } |
| break; |
| case ISCSI_PARAM_DATADGST_EN: |
| sscanf(buf, "%d", &value); |
| if (value) { |
| printk(KERN_ERR "DataDigest wasn't negotiated to None"); |
| return -EPROTO; |
| } |
| break; |
| case ISCSI_PARAM_IFMARKER_EN: |
| sscanf(buf, "%d", &value); |
| if (value) { |
| printk(KERN_ERR "IFMarker wasn't negotiated to No"); |
| return -EPROTO; |
| } |
| break; |
| case ISCSI_PARAM_OFMARKER_EN: |
| sscanf(buf, "%d", &value); |
| if (value) { |
| printk(KERN_ERR "OFMarker wasn't negotiated to No"); |
| return -EPROTO; |
| } |
| break; |
| default: |
| return iscsi_set_param(cls_conn, param, buf, buflen); |
| } |
| |
| return 0; |
| } |
| |
| static void |
| iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
| { |
| struct iscsi_conn *conn = cls_conn->dd_data; |
| |
| stats->txdata_octets = conn->txdata_octets; |
| stats->rxdata_octets = conn->rxdata_octets; |
| stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; |
| stats->dataout_pdus = conn->dataout_pdus_cnt; |
| stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; |
| stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ |
| stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ |
| stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; |
| stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; |
| stats->custom_length = 3; |
| strcpy(stats->custom[0].desc, "qp_tx_queue_full"); |
| stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ |
| strcpy(stats->custom[1].desc, "fmr_map_not_avail"); |
| stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; |
| strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
| stats->custom[2].value = conn->eh_abort_cnt; |
| } |
| |
| static int |
| iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking, |
| __u64 *ep_handle) |
| { |
| int err; |
| struct iser_conn *ib_conn; |
| |
| err = iser_conn_init(&ib_conn); |
| if (err) |
| goto out; |
| |
| err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, non_blocking); |
| if (!err) |
| *ep_handle = (__u64)(unsigned long)ib_conn; |
| |
| out: |
| return err; |
| } |
| |
| static int |
| iscsi_iser_ep_poll(__u64 ep_handle, int timeout_ms) |
| { |
| struct iser_conn *ib_conn = iscsi_iser_ib_conn_lookup(ep_handle); |
| int rc; |
| |
| if (!ib_conn) |
| return -EINVAL; |
| |
| rc = wait_event_interruptible_timeout(ib_conn->wait, |
| ib_conn->state == ISER_CONN_UP, |
| msecs_to_jiffies(timeout_ms)); |
| |
| /* if conn establishment failed, return error code to iscsi */ |
| if (!rc && |
| (ib_conn->state == ISER_CONN_TERMINATING || |
| ib_conn->state == ISER_CONN_DOWN)) |
| rc = -1; |
| |
| iser_err("ib conn %p rc = %d\n", ib_conn, rc); |
| |
| if (rc > 0) |
| return 1; /* success, this is the equivalent of POLLOUT */ |
| else if (!rc) |
| return 0; /* timeout */ |
| else |
| return rc; /* signal */ |
| } |
| |
| static void |
| iscsi_iser_ep_disconnect(__u64 ep_handle) |
| { |
| struct iser_conn *ib_conn; |
| |
| ib_conn = iscsi_iser_ib_conn_lookup(ep_handle); |
| if (!ib_conn) |
| return; |
| |
| iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); |
| iser_conn_terminate(ib_conn); |
| } |
| |
| static struct scsi_host_template iscsi_iser_sht = { |
| .module = THIS_MODULE, |
| .name = "iSCSI Initiator over iSER, v." DRV_VER, |
| .queuecommand = iscsi_queuecommand, |
| .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, |
| .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, |
| .max_sectors = 1024, |
| .cmd_per_lun = ISCSI_MAX_CMD_PER_LUN, |
| .eh_abort_handler = iscsi_eh_abort, |
| .eh_device_reset_handler= iscsi_eh_device_reset, |
| .eh_host_reset_handler = iscsi_eh_host_reset, |
| .use_clustering = DISABLE_CLUSTERING, |
| .proc_name = "iscsi_iser", |
| .this_id = -1, |
| }; |
| |
| static struct iscsi_transport iscsi_iser_transport = { |
| .owner = THIS_MODULE, |
| .name = "iser", |
| .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, |
| .param_mask = ISCSI_MAX_RECV_DLENGTH | |
| ISCSI_MAX_XMIT_DLENGTH | |
| ISCSI_HDRDGST_EN | |
| ISCSI_DATADGST_EN | |
| ISCSI_INITIAL_R2T_EN | |
| ISCSI_MAX_R2T | |
| ISCSI_IMM_DATA_EN | |
| ISCSI_FIRST_BURST | |
| ISCSI_MAX_BURST | |
| ISCSI_PDU_INORDER_EN | |
| ISCSI_DATASEQ_INORDER_EN | |
| ISCSI_EXP_STATSN | |
| ISCSI_PERSISTENT_PORT | |
| ISCSI_PERSISTENT_ADDRESS | |
| ISCSI_TARGET_NAME | ISCSI_TPGT | |
| ISCSI_USERNAME | ISCSI_PASSWORD | |
| ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | |
| ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | |
| ISCSI_PING_TMO | ISCSI_RECV_TMO, |
| .host_param_mask = ISCSI_HOST_HWADDRESS | |
| ISCSI_HOST_NETDEV_NAME | |
| ISCSI_HOST_INITIATOR_NAME, |
| .host_template = &iscsi_iser_sht, |
| .conndata_size = sizeof(struct iscsi_conn), |
| .max_lun = ISCSI_ISER_MAX_LUN, |
| .max_cmd_len = ISCSI_ISER_MAX_CMD_LEN, |
| /* session management */ |
| .create_session = iscsi_iser_session_create, |
| .destroy_session = iscsi_session_teardown, |
| /* connection management */ |
| .create_conn = iscsi_iser_conn_create, |
| .bind_conn = iscsi_iser_conn_bind, |
| .destroy_conn = iscsi_iser_conn_destroy, |
| .set_param = iscsi_iser_set_param, |
| .get_conn_param = iscsi_conn_get_param, |
| .get_session_param = iscsi_session_get_param, |
| .start_conn = iscsi_iser_conn_start, |
| .stop_conn = iscsi_conn_stop, |
| /* iscsi host params */ |
| .get_host_param = iscsi_host_get_param, |
| .set_host_param = iscsi_host_set_param, |
| /* IO */ |
| .send_pdu = iscsi_conn_send_pdu, |
| .get_stats = iscsi_iser_conn_get_stats, |
| .init_cmd_task = iscsi_iser_cmd_init, |
| .xmit_cmd_task = iscsi_iser_ctask_xmit, |
| .xmit_mgmt_task = iscsi_iser_mtask_xmit, |
| .cleanup_cmd_task = iscsi_iser_cleanup_ctask, |
| /* recovery */ |
| .session_recovery_timedout = iscsi_session_recovery_timedout, |
| |
| .ep_connect = iscsi_iser_ep_connect, |
| .ep_poll = iscsi_iser_ep_poll, |
| .ep_disconnect = iscsi_iser_ep_disconnect |
| }; |
| |
| static int __init iser_init(void) |
| { |
| int err; |
| |
| iser_dbg("Starting iSER datamover...\n"); |
| |
| if (iscsi_max_lun < 1) { |
| printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); |
| return -EINVAL; |
| } |
| |
| iscsi_iser_transport.max_lun = iscsi_max_lun; |
| |
| memset(&ig, 0, sizeof(struct iser_global)); |
| |
| ig.desc_cache = kmem_cache_create("iser_descriptors", |
| sizeof (struct iser_desc), |
| 0, SLAB_HWCACHE_ALIGN, |
| NULL); |
| if (ig.desc_cache == NULL) |
| return -ENOMEM; |
| |
| /* device init is called only after the first addr resolution */ |
| mutex_init(&ig.device_list_mutex); |
| INIT_LIST_HEAD(&ig.device_list); |
| mutex_init(&ig.connlist_mutex); |
| INIT_LIST_HEAD(&ig.connlist); |
| |
| if (!iscsi_register_transport(&iscsi_iser_transport)) { |
| iser_err("iscsi_register_transport failed\n"); |
| err = -EINVAL; |
| goto register_transport_failure; |
| } |
| |
| return 0; |
| |
| register_transport_failure: |
| kmem_cache_destroy(ig.desc_cache); |
| |
| return err; |
| } |
| |
| static void __exit iser_exit(void) |
| { |
| iser_dbg("Removing iSER datamover...\n"); |
| iscsi_unregister_transport(&iscsi_iser_transport); |
| kmem_cache_destroy(ig.desc_cache); |
| } |
| |
| module_init(iser_init); |
| module_exit(iser_exit); |