714 lines
19 KiB
C
714 lines
19 KiB
C
/*
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* iSCSI Initiator over iSER Data-Path
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*
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* Copyright (C) 2004 Dmitry Yusupov
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* Copyright (C) 2004 Alex Aizman
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* Copyright (C) 2005 Mike Christie
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* Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved.
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* maintained by openib-general@openib.org
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Credits:
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* Christoph Hellwig
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* FUJITA Tomonori
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* Arne Redlich
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* Zhenyu Wang
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* Modified by:
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* Erez Zilber
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*/
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/hardirq.h>
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#include <linux/kfifo.h>
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#include <linux/blkdev.h>
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#include <linux/init.h>
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#include <linux/ioctl.h>
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#include <linux/cdev.h>
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#include <linux/in.h>
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#include <linux/net.h>
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#include <linux/scatterlist.h>
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#include <linux/delay.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_transport_iscsi.h>
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#include "iscsi_iser.h"
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static struct scsi_host_template iscsi_iser_sht;
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static struct iscsi_transport iscsi_iser_transport;
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static struct scsi_transport_template *iscsi_iser_scsi_transport;
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static unsigned int iscsi_max_lun = 512;
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module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
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int iser_debug_level = 0;
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MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover "
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"v" DRV_VER " (" DRV_DATE ")");
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
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module_param_named(debug_level, iser_debug_level, int, 0644);
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MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
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struct iser_global ig;
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void
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iscsi_iser_recv(struct iscsi_conn *conn,
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struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
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{
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int rc = 0;
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int datalen;
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int ahslen;
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/* verify PDU length */
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datalen = ntoh24(hdr->dlength);
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if (datalen != rx_data_len) {
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printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n",
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datalen, rx_data_len);
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rc = ISCSI_ERR_DATALEN;
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goto error;
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}
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/* read AHS */
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ahslen = hdr->hlength * 4;
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rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
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if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
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goto error;
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return;
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error:
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iscsi_conn_failure(conn, rc);
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}
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static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
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{
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struct iscsi_iser_task *iser_task = task->dd_data;
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task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
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task->hdr_max = sizeof(iser_task->desc.iscsi_header);
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return 0;
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}
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/**
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* iscsi_iser_task_init - Initialize task
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* @task: iscsi task
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*
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* Initialize the task for the scsi command or mgmt command.
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*/
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static int
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iscsi_iser_task_init(struct iscsi_task *task)
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{
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struct iscsi_iser_conn *iser_conn = task->conn->dd_data;
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struct iscsi_iser_task *iser_task = task->dd_data;
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/* mgmt task */
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if (!task->sc) {
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iser_task->desc.data = task->data;
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return 0;
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}
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iser_task->command_sent = 0;
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iser_task->iser_conn = iser_conn;
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iser_task_rdma_init(iser_task);
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return 0;
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}
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/**
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* iscsi_iser_mtask_xmit - xmit management(immediate) task
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* @conn: iscsi connection
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* @task: task management task
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*
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* Notes:
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* The function can return -EAGAIN in which case caller must
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* call it again later, or recover. '0' return code means successful
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* xmit.
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*
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**/
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static int
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iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
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{
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int error = 0;
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iser_dbg("task deq [cid %d itt 0x%x]\n", conn->id, task->itt);
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error = iser_send_control(conn, task);
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/* since iser xmits control with zero copy, tasks can not be recycled
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* right after sending them.
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* The recycling scheme is based on whether a response is expected
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* - if yes, the task is recycled at iscsi_complete_pdu
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* - if no, the task is recycled at iser_snd_completion
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*/
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if (error && error != -ENOBUFS)
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iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
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return error;
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}
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static int
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iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
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struct iscsi_task *task)
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{
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struct iscsi_r2t_info *r2t = &task->unsol_r2t;
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struct iscsi_data hdr;
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int error = 0;
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/* Send data-out PDUs while there's still unsolicited data to send */
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while (iscsi_task_has_unsol_data(task)) {
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iscsi_prep_data_out_pdu(task, r2t, &hdr);
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iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
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hdr.itt, r2t->data_count);
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/* the buffer description has been passed with the command */
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/* Send the command */
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error = iser_send_data_out(conn, task, &hdr);
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if (error) {
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r2t->datasn--;
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goto iscsi_iser_task_xmit_unsol_data_exit;
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}
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r2t->sent += r2t->data_count;
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iser_dbg("Need to send %d more as data-out PDUs\n",
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r2t->data_length - r2t->sent);
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}
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iscsi_iser_task_xmit_unsol_data_exit:
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return error;
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}
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static int
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iscsi_iser_task_xmit(struct iscsi_task *task)
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{
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struct iscsi_conn *conn = task->conn;
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struct iscsi_iser_task *iser_task = task->dd_data;
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int error = 0;
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if (!task->sc)
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return iscsi_iser_mtask_xmit(conn, task);
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if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
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BUG_ON(scsi_bufflen(task->sc) == 0);
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iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
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task->itt, scsi_bufflen(task->sc),
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task->imm_count, task->unsol_r2t.data_length);
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}
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iser_dbg("task deq [cid %d itt 0x%x]\n",
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conn->id, task->itt);
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/* Send the cmd PDU */
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if (!iser_task->command_sent) {
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error = iser_send_command(conn, task);
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if (error)
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goto iscsi_iser_task_xmit_exit;
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iser_task->command_sent = 1;
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}
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/* Send unsolicited data-out PDU(s) if necessary */
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if (iscsi_task_has_unsol_data(task))
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error = iscsi_iser_task_xmit_unsol_data(conn, task);
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iscsi_iser_task_xmit_exit:
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if (error && error != -ENOBUFS)
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iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
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return error;
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}
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static void iscsi_iser_cleanup_task(struct iscsi_task *task)
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{
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struct iscsi_iser_task *iser_task = task->dd_data;
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/* mgmt tasks do not need special cleanup */
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if (!task->sc)
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return;
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if (iser_task->status == ISER_TASK_STATUS_STARTED) {
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iser_task->status = ISER_TASK_STATUS_COMPLETED;
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iser_task_rdma_finalize(iser_task);
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}
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}
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static struct iscsi_cls_conn *
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iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
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{
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struct iscsi_conn *conn;
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struct iscsi_cls_conn *cls_conn;
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struct iscsi_iser_conn *iser_conn;
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cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx);
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if (!cls_conn)
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return NULL;
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conn = cls_conn->dd_data;
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/*
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* due to issues with the login code re iser sematics
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* this not set in iscsi_conn_setup - FIXME
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*/
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conn->max_recv_dlength = 128;
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iser_conn = conn->dd_data;
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conn->dd_data = iser_conn;
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iser_conn->iscsi_conn = conn;
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return cls_conn;
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}
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static void
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iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
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{
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struct iscsi_conn *conn = cls_conn->dd_data;
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struct iscsi_iser_conn *iser_conn = conn->dd_data;
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struct iser_conn *ib_conn = iser_conn->ib_conn;
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iscsi_conn_teardown(cls_conn);
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/*
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* Userspace will normally call the stop callback and
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* already have freed the ib_conn, but if it goofed up then
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* we free it here.
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*/
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if (ib_conn) {
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ib_conn->iser_conn = NULL;
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iser_conn_put(ib_conn);
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}
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}
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static int
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iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
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struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
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int is_leading)
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{
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struct iscsi_conn *conn = cls_conn->dd_data;
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struct iscsi_iser_conn *iser_conn;
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struct iser_conn *ib_conn;
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struct iscsi_endpoint *ep;
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int error;
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error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
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if (error)
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return error;
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/* the transport ep handle comes from user space so it must be
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* verified against the global ib connections list */
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ep = iscsi_lookup_endpoint(transport_eph);
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if (!ep) {
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iser_err("can't bind eph %llx\n",
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(unsigned long long)transport_eph);
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return -EINVAL;
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}
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ib_conn = ep->dd_data;
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/* binds the iSER connection retrieved from the previously
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* connected ep_handle to the iSCSI layer connection. exchanges
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* connection pointers */
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iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn);
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iser_conn = conn->dd_data;
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ib_conn->iser_conn = iser_conn;
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iser_conn->ib_conn = ib_conn;
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iser_conn_get(ib_conn);
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return 0;
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}
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static void
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iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
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{
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struct iscsi_conn *conn = cls_conn->dd_data;
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struct iscsi_iser_conn *iser_conn = conn->dd_data;
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struct iser_conn *ib_conn = iser_conn->ib_conn;
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/*
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* Userspace may have goofed up and not bound the connection or
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* might have only partially setup the connection.
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*/
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if (ib_conn) {
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iscsi_conn_stop(cls_conn, flag);
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/*
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* There is no unbind event so the stop callback
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* must release the ref from the bind.
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*/
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iser_conn_put(ib_conn);
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}
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iser_conn->ib_conn = NULL;
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}
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static int
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iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
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{
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struct iscsi_conn *conn = cls_conn->dd_data;
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int err;
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err = iser_conn_set_full_featured_mode(conn);
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if (err)
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return err;
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return iscsi_conn_start(cls_conn);
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}
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static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
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{
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struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
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iscsi_session_teardown(cls_session);
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iscsi_host_remove(shost);
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iscsi_host_free(shost);
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}
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static struct iscsi_cls_session *
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iscsi_iser_session_create(struct iscsi_endpoint *ep,
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uint16_t cmds_max, uint16_t qdepth,
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uint32_t initial_cmdsn)
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{
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struct iscsi_cls_session *cls_session;
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struct iscsi_session *session;
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struct Scsi_Host *shost;
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struct iser_conn *ib_conn;
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shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 1);
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if (!shost)
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return NULL;
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shost->transportt = iscsi_iser_scsi_transport;
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shost->max_lun = iscsi_max_lun;
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shost->max_id = 0;
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shost->max_channel = 0;
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shost->max_cmd_len = 16;
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/*
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* older userspace tools (before 2.0-870) did not pass us
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* the leading conn's ep so this will be NULL;
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*/
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if (ep)
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ib_conn = ep->dd_data;
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if (iscsi_host_add(shost,
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ep ? ib_conn->device->ib_device->dma_device : NULL))
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goto free_host;
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/*
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* we do not support setting can_queue cmd_per_lun from userspace yet
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* because we preallocate so many resources
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*/
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cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
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ISCSI_DEF_XMIT_CMDS_MAX, 0,
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sizeof(struct iscsi_iser_task),
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initial_cmdsn, 0);
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if (!cls_session)
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goto remove_host;
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session = cls_session->dd_data;
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shost->can_queue = session->scsi_cmds_max;
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return cls_session;
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remove_host:
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iscsi_host_remove(shost);
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free_host:
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iscsi_host_free(shost);
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return NULL;
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}
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static int
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iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
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enum iscsi_param param, char *buf, int buflen)
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{
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int value;
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switch (param) {
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case ISCSI_PARAM_MAX_RECV_DLENGTH:
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/* TBD */
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break;
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case ISCSI_PARAM_HDRDGST_EN:
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sscanf(buf, "%d", &value);
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if (value) {
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printk(KERN_ERR "DataDigest wasn't negotiated to None");
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return -EPROTO;
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}
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break;
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case ISCSI_PARAM_DATADGST_EN:
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sscanf(buf, "%d", &value);
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if (value) {
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printk(KERN_ERR "DataDigest wasn't negotiated to None");
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return -EPROTO;
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}
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break;
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case ISCSI_PARAM_IFMARKER_EN:
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sscanf(buf, "%d", &value);
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if (value) {
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printk(KERN_ERR "IFMarker wasn't negotiated to No");
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return -EPROTO;
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}
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break;
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case ISCSI_PARAM_OFMARKER_EN:
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sscanf(buf, "%d", &value);
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if (value) {
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printk(KERN_ERR "OFMarker wasn't negotiated to No");
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return -EPROTO;
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}
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break;
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default:
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return iscsi_set_param(cls_conn, param, buf, buflen);
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}
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return 0;
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}
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static void
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iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
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{
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struct iscsi_conn *conn = cls_conn->dd_data;
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stats->txdata_octets = conn->txdata_octets;
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stats->rxdata_octets = conn->rxdata_octets;
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stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
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stats->dataout_pdus = conn->dataout_pdus_cnt;
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stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
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|
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);
|