diff options
| -rw-r--r-- | drivers/infiniband/ulp/iser/iscsi_iser.c | 790 |
1 files changed, 790 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c new file mode 100644 index 000000000000..4c3f2de2a06e --- /dev/null +++ b/drivers/infiniband/ulp/iser/iscsi_iser.c @@ -0,0 +1,790 @@ +/* + * 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/devfs_fs_kernel.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 void +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; + struct scsi_cmnd *sc = ctask->sc; + + iser_ctask->command_sent = 0; + iser_ctask->iser_conn = iser_conn; + + if (sc->sc_data_direction == DMA_TO_DEVICE) { + BUG_ON(ctask->total_length == 0); + /* bytes to be sent via RDMA operations */ + iser_ctask->rdma_data_count = ctask->total_length - + ctask->imm_count - + ctask->unsol_count; + + debug_scsi("cmd [itt %x total %d imm %d unsol_data %d " + "rdma_data %d]\n", + ctask->itt, ctask->total_length, ctask->imm_count, + ctask->unsol_count, iser_ctask->rdma_data_count); + } else + /* bytes to be sent via RDMA operations */ + iser_ctask->rdma_data_count = ctask->total_length; + + iser_ctask_rdma_init(iser_ctask); +} + +/** + * 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 != -EAGAIN) + 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; + struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; + + /* Send data-out PDUs while there's still unsolicited data to send */ + while (ctask->unsol_count > 0) { + iscsi_prep_unsolicit_data_pdu(ctask, &hdr, + iser_ctask->rdma_data_count); + + 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; + + debug_scsi("ctask deq [cid %d itt 0x%x]\n", + conn->id, ctask->itt); + + /* + * serialize with TMF AbortTask + */ + if (ctask->mtask) + return error; + + /* 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 != -EAGAIN) + 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); + 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 = iscsi_conn_start(cls_conn); + if (err) + return err; + + return iser_conn_set_full_featured_mode(conn); +} + +static void +iscsi_iser_conn_terminate(struct iscsi_conn *conn) +{ + struct iscsi_iser_conn *iser_conn = conn->dd_data; + struct iser_conn *ib_conn = iser_conn->ib_conn; + + BUG_ON(!ib_conn); + /* starts conn teardown process, waits until all previously * + * posted buffers get flushed, deallocates all conn resources */ + iser_conn_terminate(ib_conn); + iser_conn->ib_conn = NULL; + conn->recv_lock = NULL; +} + + +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, + 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; + + cls_session = iscsi_session_setup(iscsit, scsit, + 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; + } + + 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_conn_set_param(struct iscsi_cls_conn *cls_conn, + enum iscsi_param param, uint32_t value) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_session *session = conn->session; + + spin_lock_bh(&session->lock); + if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && + conn->stop_stage != STOP_CONN_RECOVER) { + printk(KERN_ERR "iscsi_iser: can not change parameter [%d]\n", + param); + spin_unlock_bh(&session->lock); + return 0; + } + spin_unlock_bh(&session->lock); + + switch (param) { + case ISCSI_PARAM_MAX_RECV_DLENGTH: + /* TBD */ + break; + case ISCSI_PARAM_MAX_XMIT_DLENGTH: + conn->max_xmit_dlength = value; + break; + case ISCSI_PARAM_HDRDGST_EN: + if (value) { + printk(KERN_ERR "DataDigest wasn't negotiated to None"); + return -EPROTO; + } + break; + case ISCSI_PARAM_DATADGST_EN: + if (value) { + printk(KERN_ERR "DataDigest wasn't negotiated to None"); + return -EPROTO; + } + break; + case ISCSI_PARAM_INITIAL_R2T_EN: + session->initial_r2t_en = value; + break; + case ISCSI_PARAM_IMM_DATA_EN: + session->imm_data_en = value; + break; + case ISCSI_PARAM_FIRST_BURST: + session->first_burst = value; + break; + case ISCSI_PARAM_MAX_BURST: + session->max_burst = value; + break; + case ISCSI_PARAM_PDU_INORDER_EN: + session->pdu_inorder_en = value; + break; + case ISCSI_PARAM_DATASEQ_INORDER_EN: + session->dataseq_inorder_en = value; + break; + case ISCSI_PARAM_ERL: + session->erl = value; + break; + case ISCSI_PARAM_IFMARKER_EN: + if (value) { + printk(KERN_ERR "IFMarker wasn't negotiated to No"); + return -EPROTO; + } + break; + case ISCSI_PARAM_OFMARKER_EN: + if (value) { + printk(KERN_ERR "OFMarker wasn't negotiated to No"); + return -EPROTO; + } + break; + default: + break; + } + + return 0; +} + +static int +iscsi_iser_session_get_param(struct iscsi_cls_session *cls_session, + enum iscsi_param param, uint32_t *value) +{ + struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); + struct iscsi_session *session = iscsi_hostdata(shost->hostdata); + + switch (param) { + case ISCSI_PARAM_INITIAL_R2T_EN: + *value = session->initial_r2t_en; + break; + case ISCSI_PARAM_MAX_R2T: + *value = session->max_r2t; + break; + case ISCSI_PARAM_IMM_DATA_EN: + *value = session->imm_data_en; + break; + case ISCSI_PARAM_FIRST_BURST: + *value = session->first_burst; + break; + case ISCSI_PARAM_MAX_BURST: + *value = session->max_burst; + break; + case ISCSI_PARAM_PDU_INORDER_EN: + *value = session->pdu_inorder_en; + break; + case ISCSI_PARAM_DATASEQ_INORDER_EN: + *value = session->dataseq_inorder_en; + break; + case ISCSI_PARAM_ERL: + *value = session->erl; + break; + case ISCSI_PARAM_IFMARKER_EN: + *value = 0; + break; + case ISCSI_PARAM_OFMARKER_EN: + *value = 0; + break; + default: + return ISCSI_ERR_PARAM_NOT_FOUND; + } + + return 0; +} + +static int +iscsi_iser_conn_get_param(struct iscsi_cls_conn *cls_conn, + enum iscsi_param param, uint32_t *value) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + + switch(param) { + case ISCSI_PARAM_MAX_RECV_DLENGTH: + *value = conn->max_recv_dlength; + break; + case ISCSI_PARAM_MAX_XMIT_DLENGTH: + *value = conn->max_xmit_dlength; + break; + case ISCSI_PARAM_HDRDGST_EN: + *value = 0; + break; + case ISCSI_PARAM_DATADGST_EN: + *value = 0; + break; + /*case ISCSI_PARAM_TARGET_RECV_DLENGTH: + *value = conn->target_recv_dlength; + break; + case ISCSI_PARAM_INITIATOR_RECV_DLENGTH: + *value = conn->initiator_recv_dlength; + break;*/ + default: + return ISCSI_ERR_PARAM_NOT_FOUND; + } + + 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 = 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 = { + .name = "iSCSI Initiator over iSER, v." DRV_VER, + .queuecommand = iscsi_queuecommand, + .can_queue = ISCSI_XMIT_CMDS_MAX - 1, + .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, + .cmd_per_lun = ISCSI_MAX_CMD_PER_LUN, + .eh_abort_handler = iscsi_eh_abort, + .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, + .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_conn_set_param, + .get_conn_param = iscsi_iser_conn_get_param, + .get_session_param = iscsi_iser_session_get_param, + .start_conn = iscsi_iser_conn_start, + .stop_conn = iscsi_conn_stop, + /* these are called as part of conn recovery */ + .suspend_conn_recv = NULL, /* FIXME is/how this relvant to iser? */ + .terminate_conn = iscsi_iser_conn_terminate, + /* 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, 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); |