| /* |
| * 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 |
| */ |
| |
| #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 struct scsi_host_template iscsi_iser_sht; |
| static struct iscsi_transport iscsi_iser_transport; |
| static struct scsi_transport_template *iscsi_iser_scsi_transport; |
| |
| 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; |
| 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; |
| |
| 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); |
| } |
| |
| static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) |
| { |
| struct iscsi_iser_task *iser_task = task->dd_data; |
| |
| task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; |
| task->hdr_max = sizeof(iser_task->desc.iscsi_header); |
| return 0; |
| } |
| |
| /** |
| * iscsi_iser_task_init - Initialize task |
| * @task: iscsi task |
| * |
| * Initialize the task for the scsi command or mgmt command. |
| */ |
| static int |
| iscsi_iser_task_init(struct iscsi_task *task) |
| { |
| struct iscsi_iser_conn *iser_conn = task->conn->dd_data; |
| struct iscsi_iser_task *iser_task = task->dd_data; |
| |
| /* mgmt task */ |
| if (!task->sc) { |
| iser_task->desc.data = task->data; |
| return 0; |
| } |
| |
| iser_task->command_sent = 0; |
| iser_task->iser_conn = iser_conn; |
| iser_task_rdma_init(iser_task); |
| return 0; |
| } |
| |
| /** |
| * iscsi_iser_mtask_xmit - xmit management(immediate) task |
| * @conn: iscsi connection |
| * @task: 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_task *task) |
| { |
| int error = 0; |
| |
| iser_dbg("task deq [cid %d itt 0x%x]\n", conn->id, task->itt); |
| |
| error = iser_send_control(conn, task); |
| |
| /* since iser xmits control with zero copy, tasks can not be recycled |
| * right after sending them. |
| * The recycling scheme is based on whether a response is expected |
| * - if yes, the task is recycled at iscsi_complete_pdu |
| * - if no, the task is recycled at iser_snd_completion |
| */ |
| if (error && error != -ENOBUFS) |
| iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| |
| return error; |
| } |
| |
| static int |
| iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, |
| struct iscsi_task *task) |
| { |
| struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
| struct iscsi_data hdr; |
| int error = 0; |
| |
| /* Send data-out PDUs while there's still unsolicited data to send */ |
| while (iscsi_task_has_unsol_data(task)) { |
| iscsi_prep_data_out_pdu(task, r2t, &hdr); |
| iser_dbg("Sending data-out: itt 0x%x, data count %d\n", |
| hdr.itt, r2t->data_count); |
| |
| /* the buffer description has been passed with the command */ |
| /* Send the command */ |
| error = iser_send_data_out(conn, task, &hdr); |
| if (error) { |
| r2t->datasn--; |
| goto iscsi_iser_task_xmit_unsol_data_exit; |
| } |
| r2t->sent += r2t->data_count; |
| iser_dbg("Need to send %d more as data-out PDUs\n", |
| r2t->data_length - r2t->sent); |
| } |
| |
| iscsi_iser_task_xmit_unsol_data_exit: |
| return error; |
| } |
| |
| static int |
| iscsi_iser_task_xmit(struct iscsi_task *task) |
| { |
| struct iscsi_conn *conn = task->conn; |
| struct iscsi_iser_task *iser_task = task->dd_data; |
| int error = 0; |
| |
| if (!task->sc) |
| return iscsi_iser_mtask_xmit(conn, task); |
| |
| if (task->sc->sc_data_direction == DMA_TO_DEVICE) { |
| BUG_ON(scsi_bufflen(task->sc) == 0); |
| |
| iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", |
| task->itt, scsi_bufflen(task->sc), |
| task->imm_count, task->unsol_r2t.data_length); |
| } |
| |
| iser_dbg("task deq [cid %d itt 0x%x]\n", |
| conn->id, task->itt); |
| |
| /* Send the cmd PDU */ |
| if (!iser_task->command_sent) { |
| error = iser_send_command(conn, task); |
| if (error) |
| goto iscsi_iser_task_xmit_exit; |
| iser_task->command_sent = 1; |
| } |
| |
| /* Send unsolicited data-out PDU(s) if necessary */ |
| if (iscsi_task_has_unsol_data(task)) |
| error = iscsi_iser_task_xmit_unsol_data(conn, task); |
| |
| iscsi_iser_task_xmit_exit: |
| if (error && error != -ENOBUFS) |
| iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| return error; |
| } |
| |
| static void iscsi_iser_cleanup_task(struct iscsi_task *task) |
| { |
| struct iscsi_iser_task *iser_task = task->dd_data; |
| |
| /* mgmt tasks do not need special cleanup */ |
| if (!task->sc) |
| return; |
| |
| if (iser_task->status == ISER_TASK_STATUS_STARTED) { |
| iser_task->status = ISER_TASK_STATUS_COMPLETED; |
| iser_task_rdma_finalize(iser_task); |
| } |
| } |
| |
| 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, sizeof(*iser_conn), 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 = conn->dd_data; |
| conn->dd_data = iser_conn; |
| iser_conn->iscsi_conn = conn; |
| |
| return cls_conn; |
| } |
| |
| 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; |
| struct iser_conn *ib_conn = iser_conn->ib_conn; |
| |
| iscsi_conn_teardown(cls_conn); |
| /* |
| * Userspace will normally call the stop callback and |
| * already have freed the ib_conn, but if it goofed up then |
| * we free it here. |
| */ |
| if (ib_conn) { |
| ib_conn->iser_conn = NULL; |
| iser_conn_put(ib_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; |
| struct iscsi_endpoint *ep; |
| 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 */ |
| ep = iscsi_lookup_endpoint(transport_eph); |
| if (!ep) { |
| iser_err("can't bind eph %llx\n", |
| (unsigned long long)transport_eph); |
| return -EINVAL; |
| } |
| ib_conn = ep->dd_data; |
| |
| /* 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; |
| iser_conn_get(ib_conn); |
| return 0; |
| } |
| |
| static void |
| iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
| { |
| struct iscsi_conn *conn = cls_conn->dd_data; |
| struct iscsi_iser_conn *iser_conn = conn->dd_data; |
| struct iser_conn *ib_conn = iser_conn->ib_conn; |
| |
| /* |
| * Userspace may have goofed up and not bound the connection or |
| * might have only partially setup the connection. |
| */ |
| if (ib_conn) { |
| iscsi_conn_stop(cls_conn, flag); |
| /* |
| * There is no unbind event so the stop callback |
| * must release the ref from the bind. |
| */ |
| iser_conn_put(ib_conn); |
| } |
| iser_conn->ib_conn = NULL; |
| } |
| |
| 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 void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) |
| { |
| struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
| |
| iscsi_session_teardown(cls_session); |
| iscsi_host_remove(shost); |
| iscsi_host_free(shost); |
| } |
| |
| static struct iscsi_cls_session * |
| iscsi_iser_session_create(struct iscsi_endpoint *ep, |
| uint16_t cmds_max, uint16_t qdepth, |
| uint32_t initial_cmdsn) |
| { |
| struct iscsi_cls_session *cls_session; |
| struct iscsi_session *session; |
| struct Scsi_Host *shost; |
| struct iser_conn *ib_conn; |
| |
| shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 1); |
| if (!shost) |
| return NULL; |
| shost->transportt = iscsi_iser_scsi_transport; |
| shost->max_lun = iscsi_max_lun; |
| shost->max_id = 0; |
| shost->max_channel = 0; |
| shost->max_cmd_len = 16; |
| |
| /* |
| * older userspace tools (before 2.0-870) did not pass us |
| * the leading conn's ep so this will be NULL; |
| */ |
| if (ep) |
| ib_conn = ep->dd_data; |
| |
| if (iscsi_host_add(shost, |
| ep ? ib_conn->device->ib_device->dma_device : NULL)) |
| goto free_host; |
| |
| /* |
| * we do not support setting can_queue cmd_per_lun from userspace yet |
| * because we preallocate so many resources |
| */ |
| cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, |
| ISCSI_DEF_XMIT_CMDS_MAX, |
| sizeof(struct iscsi_iser_task), |
| initial_cmdsn, 0); |
| if (!cls_session) |
| goto remove_host; |
| session = cls_session->dd_data; |
| |
| shost->can_queue = session->scsi_cmds_max; |
| return cls_session; |
| |
| remove_host: |
| iscsi_host_remove(shost); |
| free_host: |
| iscsi_host_free(shost); |
| return NULL; |
| } |
| |
| 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 = 4; |
| 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; |
| strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); |
| stats->custom[3].value = conn->fmr_unalign_cnt; |
| } |
| |
| static struct iscsi_endpoint * |
| iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, |
| int non_blocking) |
| { |
| int err; |
| struct iser_conn *ib_conn; |
| struct iscsi_endpoint *ep; |
| |
| ep = iscsi_create_endpoint(sizeof(*ib_conn)); |
| if (!ep) |
| return ERR_PTR(-ENOMEM); |
| |
| ib_conn = ep->dd_data; |
| ib_conn->ep = ep; |
| iser_conn_init(ib_conn); |
| |
| err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, |
| non_blocking); |
| if (err) { |
| iscsi_destroy_endpoint(ep); |
| return ERR_PTR(err); |
| } |
| return ep; |
| } |
| |
| static int |
| iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) |
| { |
| struct iser_conn *ib_conn; |
| int rc; |
| |
| ib_conn = ep->dd_data; |
| 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(struct iscsi_endpoint *ep) |
| { |
| struct iser_conn *ib_conn; |
| |
| ib_conn = ep->dd_data; |
| if (ib_conn->iser_conn) |
| /* |
| * Must suspend xmit path if the ep is bound to the |
| * iscsi_conn, so we know we are not accessing the ib_conn |
| * when we free it. |
| * |
| * This may not be bound if the ep poll failed. |
| */ |
| iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); |
| |
| |
| 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, |
| .change_queue_depth = iscsi_change_queue_depth, |
| .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, |
| .max_sectors = 1024, |
| .cmd_per_lun = ISER_DEF_CMD_PER_LUN, |
| .eh_abort_handler = iscsi_eh_abort, |
| .eh_device_reset_handler= iscsi_eh_device_reset, |
| .eh_target_reset_handler= iscsi_eh_target_reset, |
| .target_alloc = iscsi_target_alloc, |
| .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 | |
| ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, |
| .host_param_mask = ISCSI_HOST_HWADDRESS | |
| ISCSI_HOST_NETDEV_NAME | |
| ISCSI_HOST_INITIATOR_NAME, |
| /* session management */ |
| .create_session = iscsi_iser_session_create, |
| .destroy_session = iscsi_iser_session_destroy, |
| /* 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_iser_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_task = iscsi_iser_task_init, |
| .xmit_task = iscsi_iser_task_xmit, |
| .cleanup_task = iscsi_iser_cleanup_task, |
| .alloc_pdu = iscsi_iser_pdu_alloc, |
| /* 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; |
| } |
| |
| 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); |
| |
| iscsi_iser_scsi_transport = iscsi_register_transport( |
| &iscsi_iser_transport); |
| if (!iscsi_iser_scsi_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); |