165e7ae7bSOr Gerlitz /* 265e7ae7bSOr Gerlitz * iSCSI Initiator over iSER Data-Path 365e7ae7bSOr Gerlitz * 465e7ae7bSOr Gerlitz * Copyright (C) 2004 Dmitry Yusupov 565e7ae7bSOr Gerlitz * Copyright (C) 2004 Alex Aizman 665e7ae7bSOr Gerlitz * Copyright (C) 2005 Mike Christie 765e7ae7bSOr Gerlitz * Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved. 865e7ae7bSOr Gerlitz * maintained by openib-general@openib.org 965e7ae7bSOr Gerlitz * 1065e7ae7bSOr Gerlitz * This software is available to you under a choice of one of two 1165e7ae7bSOr Gerlitz * licenses. You may choose to be licensed under the terms of the GNU 1265e7ae7bSOr Gerlitz * General Public License (GPL) Version 2, available from the file 1365e7ae7bSOr Gerlitz * COPYING in the main directory of this source tree, or the 1465e7ae7bSOr Gerlitz * OpenIB.org BSD license below: 1565e7ae7bSOr Gerlitz * 1665e7ae7bSOr Gerlitz * Redistribution and use in source and binary forms, with or 1765e7ae7bSOr Gerlitz * without modification, are permitted provided that the following 1865e7ae7bSOr Gerlitz * conditions are met: 1965e7ae7bSOr Gerlitz * 2065e7ae7bSOr Gerlitz * - Redistributions of source code must retain the above 2165e7ae7bSOr Gerlitz * copyright notice, this list of conditions and the following 2265e7ae7bSOr Gerlitz * disclaimer. 2365e7ae7bSOr Gerlitz * 2465e7ae7bSOr Gerlitz * - Redistributions in binary form must reproduce the above 2565e7ae7bSOr Gerlitz * copyright notice, this list of conditions and the following 2665e7ae7bSOr Gerlitz * disclaimer in the documentation and/or other materials 2765e7ae7bSOr Gerlitz * provided with the distribution. 2865e7ae7bSOr Gerlitz * 2965e7ae7bSOr Gerlitz * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 3065e7ae7bSOr Gerlitz * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 3165e7ae7bSOr Gerlitz * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 3265e7ae7bSOr Gerlitz * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 3365e7ae7bSOr Gerlitz * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 3465e7ae7bSOr Gerlitz * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 3565e7ae7bSOr Gerlitz * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 3665e7ae7bSOr Gerlitz * SOFTWARE. 3765e7ae7bSOr Gerlitz * 3865e7ae7bSOr Gerlitz * Credits: 3965e7ae7bSOr Gerlitz * Christoph Hellwig 4065e7ae7bSOr Gerlitz * FUJITA Tomonori 4165e7ae7bSOr Gerlitz * Arne Redlich 4265e7ae7bSOr Gerlitz * Zhenyu Wang 4365e7ae7bSOr Gerlitz * Modified by: 4465e7ae7bSOr Gerlitz * Erez Zilber 4565e7ae7bSOr Gerlitz */ 4665e7ae7bSOr Gerlitz 4765e7ae7bSOr Gerlitz #include <linux/types.h> 4865e7ae7bSOr Gerlitz #include <linux/list.h> 4965e7ae7bSOr Gerlitz #include <linux/hardirq.h> 5065e7ae7bSOr Gerlitz #include <linux/kfifo.h> 5165e7ae7bSOr Gerlitz #include <linux/blkdev.h> 5265e7ae7bSOr Gerlitz #include <linux/init.h> 5365e7ae7bSOr Gerlitz #include <linux/ioctl.h> 5465e7ae7bSOr Gerlitz #include <linux/cdev.h> 5565e7ae7bSOr Gerlitz #include <linux/in.h> 5665e7ae7bSOr Gerlitz #include <linux/net.h> 5765e7ae7bSOr Gerlitz #include <linux/scatterlist.h> 5865e7ae7bSOr Gerlitz #include <linux/delay.h> 595a0e3ad6STejun Heo #include <linux/slab.h> 6065e7ae7bSOr Gerlitz 6165e7ae7bSOr Gerlitz #include <net/sock.h> 6265e7ae7bSOr Gerlitz 6365e7ae7bSOr Gerlitz #include <asm/uaccess.h> 6465e7ae7bSOr Gerlitz 6565e7ae7bSOr Gerlitz #include <scsi/scsi_cmnd.h> 6665e7ae7bSOr Gerlitz #include <scsi/scsi_device.h> 6765e7ae7bSOr Gerlitz #include <scsi/scsi_eh.h> 6865e7ae7bSOr Gerlitz #include <scsi/scsi_tcq.h> 6965e7ae7bSOr Gerlitz #include <scsi/scsi_host.h> 7065e7ae7bSOr Gerlitz #include <scsi/scsi.h> 7165e7ae7bSOr Gerlitz #include <scsi/scsi_transport_iscsi.h> 7265e7ae7bSOr Gerlitz 7365e7ae7bSOr Gerlitz #include "iscsi_iser.h" 7465e7ae7bSOr Gerlitz 7575613521SMike Christie static struct scsi_host_template iscsi_iser_sht; 7675613521SMike Christie static struct iscsi_transport iscsi_iser_transport; 7775613521SMike Christie static struct scsi_transport_template *iscsi_iser_scsi_transport; 7875613521SMike Christie 7965e7ae7bSOr Gerlitz static unsigned int iscsi_max_lun = 512; 8065e7ae7bSOr Gerlitz module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); 8165e7ae7bSOr Gerlitz 8265e7ae7bSOr Gerlitz int iser_debug_level = 0; 8365e7ae7bSOr Gerlitz 8465e7ae7bSOr Gerlitz MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover " 8565e7ae7bSOr Gerlitz "v" DRV_VER " (" DRV_DATE ")"); 8665e7ae7bSOr Gerlitz MODULE_LICENSE("Dual BSD/GPL"); 8765e7ae7bSOr Gerlitz MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); 8865e7ae7bSOr Gerlitz 8965e7ae7bSOr Gerlitz module_param_named(debug_level, iser_debug_level, int, 0644); 9065e7ae7bSOr Gerlitz MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); 9165e7ae7bSOr Gerlitz 9265e7ae7bSOr Gerlitz struct iser_global ig; 9365e7ae7bSOr Gerlitz 9465e7ae7bSOr Gerlitz void 9565e7ae7bSOr Gerlitz iscsi_iser_recv(struct iscsi_conn *conn, 9665e7ae7bSOr Gerlitz struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) 9765e7ae7bSOr Gerlitz { 9865e7ae7bSOr Gerlitz int rc = 0; 9965e7ae7bSOr Gerlitz int datalen; 10065e7ae7bSOr Gerlitz int ahslen; 10165e7ae7bSOr Gerlitz 10265e7ae7bSOr Gerlitz /* verify PDU length */ 10365e7ae7bSOr Gerlitz datalen = ntoh24(hdr->dlength); 10465e7ae7bSOr Gerlitz if (datalen != rx_data_len) { 10565e7ae7bSOr Gerlitz printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n", 10665e7ae7bSOr Gerlitz datalen, rx_data_len); 10765e7ae7bSOr Gerlitz rc = ISCSI_ERR_DATALEN; 10865e7ae7bSOr Gerlitz goto error; 10965e7ae7bSOr Gerlitz } 11065e7ae7bSOr Gerlitz 11165e7ae7bSOr Gerlitz /* read AHS */ 11265e7ae7bSOr Gerlitz ahslen = hdr->hlength * 4; 11365e7ae7bSOr Gerlitz 11465e7ae7bSOr Gerlitz rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 11565e7ae7bSOr Gerlitz if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 11665e7ae7bSOr Gerlitz goto error; 11765e7ae7bSOr Gerlitz 11865e7ae7bSOr Gerlitz return; 11965e7ae7bSOr Gerlitz error: 12065e7ae7bSOr Gerlitz iscsi_conn_failure(conn, rc); 12165e7ae7bSOr Gerlitz } 12265e7ae7bSOr Gerlitz 1232ff79d52SMike Christie static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) 1240f9c7449SMike Christie { 1250f9c7449SMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 1260f9c7449SMike Christie 1270f9c7449SMike Christie task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; 1280f9c7449SMike Christie task->hdr_max = sizeof(iser_task->desc.iscsi_header); 1290f9c7449SMike Christie return 0; 1300f9c7449SMike Christie } 13165e7ae7bSOr Gerlitz 132f19624aaSOr Gerlitz int iser_initialize_task_headers(struct iscsi_task *task, 133f19624aaSOr Gerlitz struct iser_tx_desc *tx_desc) 134f19624aaSOr Gerlitz { 135f19624aaSOr Gerlitz struct iscsi_iser_conn *iser_conn = task->conn->dd_data; 136f19624aaSOr Gerlitz struct iser_device *device = iser_conn->ib_conn->device; 137f19624aaSOr Gerlitz struct iscsi_iser_task *iser_task = task->dd_data; 138f19624aaSOr Gerlitz u64 dma_addr; 139f19624aaSOr Gerlitz 140f19624aaSOr Gerlitz dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, 141f19624aaSOr Gerlitz ISER_HEADERS_LEN, DMA_TO_DEVICE); 142f19624aaSOr Gerlitz if (ib_dma_mapping_error(device->ib_device, dma_addr)) 143f19624aaSOr Gerlitz return -ENOMEM; 144f19624aaSOr Gerlitz 145f19624aaSOr Gerlitz tx_desc->dma_addr = dma_addr; 146f19624aaSOr Gerlitz tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 147f19624aaSOr Gerlitz tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 148f19624aaSOr Gerlitz tx_desc->tx_sg[0].lkey = device->mr->lkey; 149f19624aaSOr Gerlitz 150f19624aaSOr Gerlitz iser_task->headers_initialized = 1; 151f19624aaSOr Gerlitz iser_task->iser_conn = iser_conn; 152f19624aaSOr Gerlitz return 0; 153f19624aaSOr Gerlitz } 15465e7ae7bSOr Gerlitz /** 1552261ec3dSMike Christie * iscsi_iser_task_init - Initialize task 1562261ec3dSMike Christie * @task: iscsi task 15765e7ae7bSOr Gerlitz * 1582261ec3dSMike Christie * Initialize the task for the scsi command or mgmt command. 1592747fdb2SMike Christie */ 160a8ac6311SOlaf Kirch static int 1612261ec3dSMike Christie iscsi_iser_task_init(struct iscsi_task *task) 16265e7ae7bSOr Gerlitz { 1632261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 16465e7ae7bSOr Gerlitz 165f19624aaSOr Gerlitz if (!iser_task->headers_initialized) 166f19624aaSOr Gerlitz if (iser_initialize_task_headers(task, &iser_task->desc)) 167f19624aaSOr Gerlitz return -ENOMEM; 168f19624aaSOr Gerlitz 1692261ec3dSMike Christie /* mgmt task */ 170f19624aaSOr Gerlitz if (!task->sc) 1712747fdb2SMike Christie return 0; 1722747fdb2SMike Christie 1732261ec3dSMike Christie iser_task->command_sent = 0; 1742261ec3dSMike Christie iser_task_rdma_init(iser_task); 175a8ac6311SOlaf Kirch return 0; 17665e7ae7bSOr Gerlitz } 17765e7ae7bSOr Gerlitz 17865e7ae7bSOr Gerlitz /** 1792261ec3dSMike Christie * iscsi_iser_mtask_xmit - xmit management(immediate) task 18065e7ae7bSOr Gerlitz * @conn: iscsi connection 1812261ec3dSMike Christie * @task: task management task 18265e7ae7bSOr Gerlitz * 18365e7ae7bSOr Gerlitz * Notes: 18465e7ae7bSOr Gerlitz * The function can return -EAGAIN in which case caller must 18565e7ae7bSOr Gerlitz * call it again later, or recover. '0' return code means successful 18665e7ae7bSOr Gerlitz * xmit. 18765e7ae7bSOr Gerlitz * 18865e7ae7bSOr Gerlitz **/ 18965e7ae7bSOr Gerlitz static int 1902261ec3dSMike Christie iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 19165e7ae7bSOr Gerlitz { 19265e7ae7bSOr Gerlitz int error = 0; 19365e7ae7bSOr Gerlitz 194962b4b52SOr Gerlitz iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); 19565e7ae7bSOr Gerlitz 1962261ec3dSMike Christie error = iser_send_control(conn, task); 19765e7ae7bSOr Gerlitz 1982261ec3dSMike Christie /* since iser xmits control with zero copy, tasks can not be recycled 19965e7ae7bSOr Gerlitz * right after sending them. 20065e7ae7bSOr Gerlitz * The recycling scheme is based on whether a response is expected 2012261ec3dSMike Christie * - if yes, the task is recycled at iscsi_complete_pdu 2022261ec3dSMike Christie * - if no, the task is recycled at iser_snd_completion 20365e7ae7bSOr Gerlitz */ 20465e7ae7bSOr Gerlitz return error; 20565e7ae7bSOr Gerlitz } 20665e7ae7bSOr Gerlitz 20765e7ae7bSOr Gerlitz static int 2082747fdb2SMike Christie iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 2092261ec3dSMike Christie struct iscsi_task *task) 21065e7ae7bSOr Gerlitz { 2110f9c7449SMike Christie struct iscsi_r2t_info *r2t = &task->unsol_r2t; 21265e7ae7bSOr Gerlitz struct iscsi_data hdr; 21365e7ae7bSOr Gerlitz int error = 0; 21465e7ae7bSOr Gerlitz 21565e7ae7bSOr Gerlitz /* Send data-out PDUs while there's still unsolicited data to send */ 2160f9c7449SMike Christie while (iscsi_task_has_unsol_data(task)) { 2170f9c7449SMike Christie iscsi_prep_data_out_pdu(task, r2t, &hdr); 21848a237a2SMike Christie iser_dbg("Sending data-out: itt 0x%x, data count %d\n", 2190f9c7449SMike Christie hdr.itt, r2t->data_count); 22065e7ae7bSOr Gerlitz 22165e7ae7bSOr Gerlitz /* the buffer description has been passed with the command */ 22265e7ae7bSOr Gerlitz /* Send the command */ 2232261ec3dSMike Christie error = iser_send_data_out(conn, task, &hdr); 22465e7ae7bSOr Gerlitz if (error) { 2250f9c7449SMike Christie r2t->datasn--; 2262747fdb2SMike Christie goto iscsi_iser_task_xmit_unsol_data_exit; 22765e7ae7bSOr Gerlitz } 2280f9c7449SMike Christie r2t->sent += r2t->data_count; 22948a237a2SMike Christie iser_dbg("Need to send %d more as data-out PDUs\n", 2300f9c7449SMike Christie r2t->data_length - r2t->sent); 23165e7ae7bSOr Gerlitz } 23265e7ae7bSOr Gerlitz 2332747fdb2SMike Christie iscsi_iser_task_xmit_unsol_data_exit: 23465e7ae7bSOr Gerlitz return error; 23565e7ae7bSOr Gerlitz } 23665e7ae7bSOr Gerlitz 23765e7ae7bSOr Gerlitz static int 2382261ec3dSMike Christie iscsi_iser_task_xmit(struct iscsi_task *task) 23965e7ae7bSOr Gerlitz { 2402261ec3dSMike Christie struct iscsi_conn *conn = task->conn; 2412261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 24265e7ae7bSOr Gerlitz int error = 0; 24365e7ae7bSOr Gerlitz 2442261ec3dSMike Christie if (!task->sc) 2452261ec3dSMike Christie return iscsi_iser_mtask_xmit(conn, task); 2462747fdb2SMike Christie 2472261ec3dSMike Christie if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 2482261ec3dSMike Christie BUG_ON(scsi_bufflen(task->sc) == 0); 24977a23c21SMike Christie 25048a237a2SMike Christie iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", 2512261ec3dSMike Christie task->itt, scsi_bufflen(task->sc), 2520f9c7449SMike Christie task->imm_count, task->unsol_r2t.data_length); 25377a23c21SMike Christie } 25477a23c21SMike Christie 255962b4b52SOr Gerlitz iser_dbg("ctask xmit [cid %d itt 0x%x]\n", 2562261ec3dSMike Christie conn->id, task->itt); 25765e7ae7bSOr Gerlitz 25865e7ae7bSOr Gerlitz /* Send the cmd PDU */ 2592261ec3dSMike Christie if (!iser_task->command_sent) { 2602261ec3dSMike Christie error = iser_send_command(conn, task); 26165e7ae7bSOr Gerlitz if (error) 2622747fdb2SMike Christie goto iscsi_iser_task_xmit_exit; 2632261ec3dSMike Christie iser_task->command_sent = 1; 26465e7ae7bSOr Gerlitz } 26565e7ae7bSOr Gerlitz 26665e7ae7bSOr Gerlitz /* Send unsolicited data-out PDU(s) if necessary */ 2670f9c7449SMike Christie if (iscsi_task_has_unsol_data(task)) 2682261ec3dSMike Christie error = iscsi_iser_task_xmit_unsol_data(conn, task); 26965e7ae7bSOr Gerlitz 2702747fdb2SMike Christie iscsi_iser_task_xmit_exit: 27165e7ae7bSOr Gerlitz return error; 27265e7ae7bSOr Gerlitz } 27365e7ae7bSOr Gerlitz 2740f9c7449SMike Christie static void iscsi_iser_cleanup_task(struct iscsi_task *task) 27565e7ae7bSOr Gerlitz { 2762261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 27765e7ae7bSOr Gerlitz 278b3cd5050SMike Christie /* mgmt tasks do not need special cleanup */ 279b3cd5050SMike Christie if (!task->sc) 2802747fdb2SMike Christie return; 28165e7ae7bSOr Gerlitz 2822261ec3dSMike Christie if (iser_task->status == ISER_TASK_STATUS_STARTED) { 2832261ec3dSMike Christie iser_task->status = ISER_TASK_STATUS_COMPLETED; 2842261ec3dSMike Christie iser_task_rdma_finalize(iser_task); 28565e7ae7bSOr Gerlitz } 28665e7ae7bSOr Gerlitz } 28765e7ae7bSOr Gerlitz 28865e7ae7bSOr Gerlitz static struct iscsi_cls_conn * 28965e7ae7bSOr Gerlitz iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 29065e7ae7bSOr Gerlitz { 29165e7ae7bSOr Gerlitz struct iscsi_conn *conn; 29265e7ae7bSOr Gerlitz struct iscsi_cls_conn *cls_conn; 29365e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn; 29465e7ae7bSOr Gerlitz 2955d91e209SMike Christie cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); 29665e7ae7bSOr Gerlitz if (!cls_conn) 29765e7ae7bSOr Gerlitz return NULL; 29865e7ae7bSOr Gerlitz conn = cls_conn->dd_data; 29965e7ae7bSOr Gerlitz 30065e7ae7bSOr Gerlitz /* 30165e7ae7bSOr Gerlitz * due to issues with the login code re iser sematics 30265e7ae7bSOr Gerlitz * this not set in iscsi_conn_setup - FIXME 30365e7ae7bSOr Gerlitz */ 304bcc60c38SOr Gerlitz conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; 30565e7ae7bSOr Gerlitz 3065d91e209SMike Christie iser_conn = conn->dd_data; 30765e7ae7bSOr Gerlitz conn->dd_data = iser_conn; 30865e7ae7bSOr Gerlitz iser_conn->iscsi_conn = conn; 30965e7ae7bSOr Gerlitz 31065e7ae7bSOr Gerlitz return cls_conn; 31165e7ae7bSOr Gerlitz } 31265e7ae7bSOr Gerlitz 31365e7ae7bSOr Gerlitz static void 31465e7ae7bSOr Gerlitz iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) 31565e7ae7bSOr Gerlitz { 31665e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 31765e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn = conn->dd_data; 318b40977d9SMike Christie struct iser_conn *ib_conn = iser_conn->ib_conn; 31965e7ae7bSOr Gerlitz 32065e7ae7bSOr Gerlitz iscsi_conn_teardown(cls_conn); 321b40977d9SMike Christie /* 322b40977d9SMike Christie * Userspace will normally call the stop callback and 323b40977d9SMike Christie * already have freed the ib_conn, but if it goofed up then 324b40977d9SMike Christie * we free it here. 325b40977d9SMike Christie */ 326b40977d9SMike Christie if (ib_conn) { 327b40977d9SMike Christie ib_conn->iser_conn = NULL; 32839ff05dbSOr Gerlitz iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ 329b40977d9SMike Christie } 33065e7ae7bSOr Gerlitz } 33165e7ae7bSOr Gerlitz 33265e7ae7bSOr Gerlitz static int 33365e7ae7bSOr Gerlitz iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 33465e7ae7bSOr Gerlitz struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, 33565e7ae7bSOr Gerlitz int is_leading) 33665e7ae7bSOr Gerlitz { 33765e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 33865e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn; 33965e7ae7bSOr Gerlitz struct iser_conn *ib_conn; 340412eeafaSMike Christie struct iscsi_endpoint *ep; 34165e7ae7bSOr Gerlitz int error; 34265e7ae7bSOr Gerlitz 34365e7ae7bSOr Gerlitz error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 34465e7ae7bSOr Gerlitz if (error) 34565e7ae7bSOr Gerlitz return error; 34665e7ae7bSOr Gerlitz 34765e7ae7bSOr Gerlitz /* the transport ep handle comes from user space so it must be 34865e7ae7bSOr Gerlitz * verified against the global ib connections list */ 349412eeafaSMike Christie ep = iscsi_lookup_endpoint(transport_eph); 350412eeafaSMike Christie if (!ep) { 35165e7ae7bSOr Gerlitz iser_err("can't bind eph %llx\n", 35265e7ae7bSOr Gerlitz (unsigned long long)transport_eph); 35365e7ae7bSOr Gerlitz return -EINVAL; 35465e7ae7bSOr Gerlitz } 355412eeafaSMike Christie ib_conn = ep->dd_data; 356412eeafaSMike Christie 35765e7ae7bSOr Gerlitz /* binds the iSER connection retrieved from the previously 35865e7ae7bSOr Gerlitz * connected ep_handle to the iSCSI layer connection. exchanges 35965e7ae7bSOr Gerlitz * connection pointers */ 36039ff05dbSOr Gerlitz iser_err("binding iscsi/iser conn %p %p to ib_conn %p\n", 36139ff05dbSOr Gerlitz conn, conn->dd_data, ib_conn); 36265e7ae7bSOr Gerlitz iser_conn = conn->dd_data; 36365e7ae7bSOr Gerlitz ib_conn->iser_conn = iser_conn; 36465e7ae7bSOr Gerlitz iser_conn->ib_conn = ib_conn; 36539ff05dbSOr Gerlitz iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */ 36665e7ae7bSOr Gerlitz return 0; 36765e7ae7bSOr Gerlitz } 36865e7ae7bSOr Gerlitz 369b40977d9SMike Christie static void 370b40977d9SMike Christie iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 371b40977d9SMike Christie { 372b40977d9SMike Christie struct iscsi_conn *conn = cls_conn->dd_data; 373b40977d9SMike Christie struct iscsi_iser_conn *iser_conn = conn->dd_data; 374b40977d9SMike Christie struct iser_conn *ib_conn = iser_conn->ib_conn; 375b40977d9SMike Christie 376913e5bf4SMike Christie /* 377913e5bf4SMike Christie * Userspace may have goofed up and not bound the connection or 378913e5bf4SMike Christie * might have only partially setup the connection. 379913e5bf4SMike Christie */ 380913e5bf4SMike Christie if (ib_conn) { 381b40977d9SMike Christie iscsi_conn_stop(cls_conn, flag); 382b40977d9SMike Christie /* 383b40977d9SMike Christie * There is no unbind event so the stop callback 384b40977d9SMike Christie * must release the ref from the bind. 385b40977d9SMike Christie */ 38639ff05dbSOr Gerlitz iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ 387913e5bf4SMike Christie } 388b40977d9SMike Christie iser_conn->ib_conn = NULL; 389b40977d9SMike Christie } 390b40977d9SMike Christie 39165e7ae7bSOr Gerlitz static int 39265e7ae7bSOr Gerlitz iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 39365e7ae7bSOr Gerlitz { 39465e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 39565e7ae7bSOr Gerlitz int err; 39665e7ae7bSOr Gerlitz 3972e7a7426SErez Zilber err = iser_conn_set_full_featured_mode(conn); 39865e7ae7bSOr Gerlitz if (err) 39965e7ae7bSOr Gerlitz return err; 40065e7ae7bSOr Gerlitz 4012e7a7426SErez Zilber return iscsi_conn_start(cls_conn); 40265e7ae7bSOr Gerlitz } 40365e7ae7bSOr Gerlitz 40475613521SMike Christie static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 40575613521SMike Christie { 40675613521SMike Christie struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 40775613521SMike Christie 408e5bd7b54SMike Christie iscsi_session_teardown(cls_session); 409a4804cd6SMike Christie iscsi_host_remove(shost); 410a4804cd6SMike Christie iscsi_host_free(shost); 41175613521SMike Christie } 41265e7ae7bSOr Gerlitz 41365e7ae7bSOr Gerlitz static struct iscsi_cls_session * 414412eeafaSMike Christie iscsi_iser_session_create(struct iscsi_endpoint *ep, 4151548271eSMike Christie uint16_t cmds_max, uint16_t qdepth, 4165e7facb7SMike Christie uint32_t initial_cmdsn) 41765e7ae7bSOr Gerlitz { 41865e7ae7bSOr Gerlitz struct iscsi_cls_session *cls_session; 41965e7ae7bSOr Gerlitz struct iscsi_session *session; 420412eeafaSMike Christie struct Scsi_Host *shost; 421412eeafaSMike Christie struct iser_conn *ib_conn; 42275613521SMike Christie 423962b4b52SOr Gerlitz shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); 42475613521SMike Christie if (!shost) 42575613521SMike Christie return NULL; 42675613521SMike Christie shost->transportt = iscsi_iser_scsi_transport; 42775613521SMike Christie shost->max_lun = iscsi_max_lun; 42875613521SMike Christie shost->max_id = 0; 42975613521SMike Christie shost->max_channel = 0; 43075613521SMike Christie shost->max_cmd_len = 16; 43175613521SMike Christie 432412eeafaSMike Christie /* 433412eeafaSMike Christie * older userspace tools (before 2.0-870) did not pass us 434412eeafaSMike Christie * the leading conn's ep so this will be NULL; 435412eeafaSMike Christie */ 436412eeafaSMike Christie if (ep) 437412eeafaSMike Christie ib_conn = ep->dd_data; 438412eeafaSMike Christie 439412eeafaSMike Christie if (iscsi_host_add(shost, 440412eeafaSMike Christie ep ? ib_conn->device->ib_device->dma_device : NULL)) 44175613521SMike Christie goto free_host; 44265e7ae7bSOr Gerlitz 4431548271eSMike Christie /* 4441548271eSMike Christie * we do not support setting can_queue cmd_per_lun from userspace yet 4451548271eSMike Christie * because we preallocate so many resources 4461548271eSMike Christie */ 44775613521SMike Christie cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 448b8b9e1b8SJayamohan Kallickal ISCSI_DEF_XMIT_CMDS_MAX, 0, 4492261ec3dSMike Christie sizeof(struct iscsi_iser_task), 4507970634bSMike Christie initial_cmdsn, 0); 45165e7ae7bSOr Gerlitz if (!cls_session) 45275613521SMike Christie goto remove_host; 45375613521SMike Christie session = cls_session->dd_data; 45465e7ae7bSOr Gerlitz 4552747fdb2SMike Christie shost->can_queue = session->scsi_cmds_max; 45665e7ae7bSOr Gerlitz return cls_session; 45775613521SMike Christie 45875613521SMike Christie remove_host: 459a4804cd6SMike Christie iscsi_host_remove(shost); 46075613521SMike Christie free_host: 461a4804cd6SMike Christie iscsi_host_free(shost); 46275613521SMike Christie return NULL; 46365e7ae7bSOr Gerlitz } 46465e7ae7bSOr Gerlitz 46565e7ae7bSOr Gerlitz static int 466358ff019SMike Christie iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 467358ff019SMike Christie enum iscsi_param param, char *buf, int buflen) 46865e7ae7bSOr Gerlitz { 469358ff019SMike Christie int value; 47065e7ae7bSOr Gerlitz 47165e7ae7bSOr Gerlitz switch (param) { 47265e7ae7bSOr Gerlitz case ISCSI_PARAM_MAX_RECV_DLENGTH: 47365e7ae7bSOr Gerlitz /* TBD */ 47465e7ae7bSOr Gerlitz break; 47565e7ae7bSOr Gerlitz case ISCSI_PARAM_HDRDGST_EN: 476358ff019SMike Christie sscanf(buf, "%d", &value); 47765e7ae7bSOr Gerlitz if (value) { 47865e7ae7bSOr Gerlitz printk(KERN_ERR "DataDigest wasn't negotiated to None"); 47965e7ae7bSOr Gerlitz return -EPROTO; 48065e7ae7bSOr Gerlitz } 48165e7ae7bSOr Gerlitz break; 48265e7ae7bSOr Gerlitz case ISCSI_PARAM_DATADGST_EN: 483358ff019SMike Christie sscanf(buf, "%d", &value); 48465e7ae7bSOr Gerlitz if (value) { 48565e7ae7bSOr Gerlitz printk(KERN_ERR "DataDigest wasn't negotiated to None"); 48665e7ae7bSOr Gerlitz return -EPROTO; 48765e7ae7bSOr Gerlitz } 48865e7ae7bSOr Gerlitz break; 48965e7ae7bSOr Gerlitz case ISCSI_PARAM_IFMARKER_EN: 490358ff019SMike Christie sscanf(buf, "%d", &value); 49165e7ae7bSOr Gerlitz if (value) { 49265e7ae7bSOr Gerlitz printk(KERN_ERR "IFMarker wasn't negotiated to No"); 49365e7ae7bSOr Gerlitz return -EPROTO; 49465e7ae7bSOr Gerlitz } 49565e7ae7bSOr Gerlitz break; 49665e7ae7bSOr Gerlitz case ISCSI_PARAM_OFMARKER_EN: 497358ff019SMike Christie sscanf(buf, "%d", &value); 49865e7ae7bSOr Gerlitz if (value) { 49965e7ae7bSOr Gerlitz printk(KERN_ERR "OFMarker wasn't negotiated to No"); 50065e7ae7bSOr Gerlitz return -EPROTO; 50165e7ae7bSOr Gerlitz } 50265e7ae7bSOr Gerlitz break; 50365e7ae7bSOr Gerlitz default: 504358ff019SMike Christie return iscsi_set_param(cls_conn, param, buf, buflen); 50565e7ae7bSOr Gerlitz } 50665e7ae7bSOr Gerlitz 50765e7ae7bSOr Gerlitz return 0; 50865e7ae7bSOr Gerlitz } 50965e7ae7bSOr Gerlitz 51065e7ae7bSOr Gerlitz static void 51165e7ae7bSOr Gerlitz iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 51265e7ae7bSOr Gerlitz { 51365e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 51465e7ae7bSOr Gerlitz 51565e7ae7bSOr Gerlitz stats->txdata_octets = conn->txdata_octets; 51665e7ae7bSOr Gerlitz stats->rxdata_octets = conn->rxdata_octets; 51765e7ae7bSOr Gerlitz stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 51865e7ae7bSOr Gerlitz stats->dataout_pdus = conn->dataout_pdus_cnt; 51965e7ae7bSOr Gerlitz stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 52065e7ae7bSOr Gerlitz stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 52165e7ae7bSOr Gerlitz stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 52265e7ae7bSOr Gerlitz stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 52365e7ae7bSOr Gerlitz stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 52487528227SEli Dorfman stats->custom_length = 4; 52565e7ae7bSOr Gerlitz strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 52665e7ae7bSOr Gerlitz stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 52765e7ae7bSOr Gerlitz strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 52865e7ae7bSOr Gerlitz stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 52965e7ae7bSOr Gerlitz strcpy(stats->custom[2].desc, "eh_abort_cnt"); 53065e7ae7bSOr Gerlitz stats->custom[2].value = conn->eh_abort_cnt; 53187528227SEli Dorfman strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 53287528227SEli Dorfman stats->custom[3].value = conn->fmr_unalign_cnt; 53365e7ae7bSOr Gerlitz } 53465e7ae7bSOr Gerlitz 535412eeafaSMike Christie static struct iscsi_endpoint * 53610eb0f01SMike Christie iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, 53710eb0f01SMike Christie int non_blocking) 53865e7ae7bSOr Gerlitz { 53965e7ae7bSOr Gerlitz int err; 54065e7ae7bSOr Gerlitz struct iser_conn *ib_conn; 541412eeafaSMike Christie struct iscsi_endpoint *ep; 54265e7ae7bSOr Gerlitz 543412eeafaSMike Christie ep = iscsi_create_endpoint(sizeof(*ib_conn)); 544412eeafaSMike Christie if (!ep) 545412eeafaSMike Christie return ERR_PTR(-ENOMEM); 54665e7ae7bSOr Gerlitz 547412eeafaSMike Christie ib_conn = ep->dd_data; 548412eeafaSMike Christie ib_conn->ep = ep; 549412eeafaSMike Christie iser_conn_init(ib_conn); 55065e7ae7bSOr Gerlitz 551412eeafaSMike Christie err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, 552412eeafaSMike Christie non_blocking); 553412eeafaSMike Christie if (err) { 554412eeafaSMike Christie iscsi_destroy_endpoint(ep); 555412eeafaSMike Christie return ERR_PTR(err); 556412eeafaSMike Christie } 557412eeafaSMike Christie return ep; 55865e7ae7bSOr Gerlitz } 55965e7ae7bSOr Gerlitz 56065e7ae7bSOr Gerlitz static int 561412eeafaSMike Christie iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 56265e7ae7bSOr Gerlitz { 563412eeafaSMike Christie struct iser_conn *ib_conn; 56465e7ae7bSOr Gerlitz int rc; 56565e7ae7bSOr Gerlitz 566412eeafaSMike Christie ib_conn = ep->dd_data; 56765e7ae7bSOr Gerlitz rc = wait_event_interruptible_timeout(ib_conn->wait, 56865e7ae7bSOr Gerlitz ib_conn->state == ISER_CONN_UP, 56965e7ae7bSOr Gerlitz msecs_to_jiffies(timeout_ms)); 57065e7ae7bSOr Gerlitz 57165e7ae7bSOr Gerlitz /* if conn establishment failed, return error code to iscsi */ 57265e7ae7bSOr Gerlitz if (!rc && 57365e7ae7bSOr Gerlitz (ib_conn->state == ISER_CONN_TERMINATING || 57465e7ae7bSOr Gerlitz ib_conn->state == ISER_CONN_DOWN)) 57565e7ae7bSOr Gerlitz rc = -1; 57665e7ae7bSOr Gerlitz 57765e7ae7bSOr Gerlitz iser_err("ib conn %p rc = %d\n", ib_conn, rc); 57865e7ae7bSOr Gerlitz 57965e7ae7bSOr Gerlitz if (rc > 0) 58065e7ae7bSOr Gerlitz return 1; /* success, this is the equivalent of POLLOUT */ 58165e7ae7bSOr Gerlitz else if (!rc) 58265e7ae7bSOr Gerlitz return 0; /* timeout */ 58365e7ae7bSOr Gerlitz else 58465e7ae7bSOr Gerlitz return rc; /* signal */ 58565e7ae7bSOr Gerlitz } 58665e7ae7bSOr Gerlitz 58765e7ae7bSOr Gerlitz static void 588412eeafaSMike Christie iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 58965e7ae7bSOr Gerlitz { 5901c83469dSMike Christie struct iser_conn *ib_conn; 59165e7ae7bSOr Gerlitz 592412eeafaSMike Christie ib_conn = ep->dd_data; 593b40977d9SMike Christie if (ib_conn->iser_conn) 594b40977d9SMike Christie /* 595b40977d9SMike Christie * Must suspend xmit path if the ep is bound to the 596b40977d9SMike Christie * iscsi_conn, so we know we are not accessing the ib_conn 597b40977d9SMike Christie * when we free it. 598b40977d9SMike Christie * 599b40977d9SMike Christie * This may not be bound if the ep poll failed. 600b40977d9SMike Christie */ 601b40977d9SMike Christie iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); 602b40977d9SMike Christie 60365e7ae7bSOr Gerlitz 60465e7ae7bSOr Gerlitz iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); 60565e7ae7bSOr Gerlitz iser_conn_terminate(ib_conn); 60665e7ae7bSOr Gerlitz } 60765e7ae7bSOr Gerlitz 60865e7ae7bSOr Gerlitz static struct scsi_host_template iscsi_iser_sht = { 6097974392cSMike Christie .module = THIS_MODULE, 61065e7ae7bSOr Gerlitz .name = "iSCSI Initiator over iSER, v." DRV_VER, 61165e7ae7bSOr Gerlitz .queuecommand = iscsi_queuecommand, 6126410627eSErez Zilber .change_queue_depth = iscsi_change_queue_depth, 61365e7ae7bSOr Gerlitz .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 6148072ec2fSErez Zilber .max_sectors = 1024, 615e28f3d5bSMike Christie .cmd_per_lun = ISER_DEF_CMD_PER_LUN, 61665e7ae7bSOr Gerlitz .eh_abort_handler = iscsi_eh_abort, 61790c18f3cSErez Zilber .eh_device_reset_handler= iscsi_eh_device_reset, 618309ce156SJayamohan Kallickal .eh_target_reset_handler = iscsi_eh_recover_target, 6196b5d6c44SMike Christie .target_alloc = iscsi_target_alloc, 62065e7ae7bSOr Gerlitz .use_clustering = DISABLE_CLUSTERING, 62165e7ae7bSOr Gerlitz .proc_name = "iscsi_iser", 62265e7ae7bSOr Gerlitz .this_id = -1, 62365e7ae7bSOr Gerlitz }; 62465e7ae7bSOr Gerlitz 62565e7ae7bSOr Gerlitz static struct iscsi_transport iscsi_iser_transport = { 62665e7ae7bSOr Gerlitz .owner = THIS_MODULE, 62765e7ae7bSOr Gerlitz .name = "iser", 62865e7ae7bSOr Gerlitz .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, 62965e7ae7bSOr Gerlitz .param_mask = ISCSI_MAX_RECV_DLENGTH | 63065e7ae7bSOr Gerlitz ISCSI_MAX_XMIT_DLENGTH | 63165e7ae7bSOr Gerlitz ISCSI_HDRDGST_EN | 63265e7ae7bSOr Gerlitz ISCSI_DATADGST_EN | 63365e7ae7bSOr Gerlitz ISCSI_INITIAL_R2T_EN | 63465e7ae7bSOr Gerlitz ISCSI_MAX_R2T | 63565e7ae7bSOr Gerlitz ISCSI_IMM_DATA_EN | 63665e7ae7bSOr Gerlitz ISCSI_FIRST_BURST | 63765e7ae7bSOr Gerlitz ISCSI_MAX_BURST | 63865e7ae7bSOr Gerlitz ISCSI_PDU_INORDER_EN | 639358ff019SMike Christie ISCSI_DATASEQ_INORDER_EN | 640358ff019SMike Christie ISCSI_EXP_STATSN | 641358ff019SMike Christie ISCSI_PERSISTENT_PORT | 642358ff019SMike Christie ISCSI_PERSISTENT_ADDRESS | 643b2c64167SMike Christie ISCSI_TARGET_NAME | ISCSI_TPGT | 644b2c64167SMike Christie ISCSI_USERNAME | ISCSI_PASSWORD | 645f6d5180cSMike Christie ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | 646f6d5180cSMike Christie ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | 647b20d038dSMike Christie ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO | 64888dfd340SMike Christie ISCSI_PING_TMO | ISCSI_RECV_TMO | 64988dfd340SMike Christie ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, 6508ad5781aSMike Christie .host_param_mask = ISCSI_HOST_HWADDRESS | 651d8196ed2SMike Christie ISCSI_HOST_NETDEV_NAME | 6528ad5781aSMike Christie ISCSI_HOST_INITIATOR_NAME, 65365e7ae7bSOr Gerlitz /* session management */ 65465e7ae7bSOr Gerlitz .create_session = iscsi_iser_session_create, 65575613521SMike Christie .destroy_session = iscsi_iser_session_destroy, 65665e7ae7bSOr Gerlitz /* connection management */ 65765e7ae7bSOr Gerlitz .create_conn = iscsi_iser_conn_create, 65865e7ae7bSOr Gerlitz .bind_conn = iscsi_iser_conn_bind, 65965e7ae7bSOr Gerlitz .destroy_conn = iscsi_iser_conn_destroy, 660358ff019SMike Christie .set_param = iscsi_iser_set_param, 661358ff019SMike Christie .get_conn_param = iscsi_conn_get_param, 662358ff019SMike Christie .get_session_param = iscsi_session_get_param, 66365e7ae7bSOr Gerlitz .start_conn = iscsi_iser_conn_start, 664b40977d9SMike Christie .stop_conn = iscsi_iser_conn_stop, 6650801c242SMike Christie /* iscsi host params */ 6660801c242SMike Christie .get_host_param = iscsi_host_get_param, 6670801c242SMike Christie .set_host_param = iscsi_host_set_param, 66865e7ae7bSOr Gerlitz /* IO */ 66965e7ae7bSOr Gerlitz .send_pdu = iscsi_conn_send_pdu, 67065e7ae7bSOr Gerlitz .get_stats = iscsi_iser_conn_get_stats, 6712747fdb2SMike Christie .init_task = iscsi_iser_task_init, 6722747fdb2SMike Christie .xmit_task = iscsi_iser_task_xmit, 6732747fdb2SMike Christie .cleanup_task = iscsi_iser_cleanup_task, 6740f9c7449SMike Christie .alloc_pdu = iscsi_iser_pdu_alloc, 67565e7ae7bSOr Gerlitz /* recovery */ 67665e7ae7bSOr Gerlitz .session_recovery_timedout = iscsi_session_recovery_timedout, 67765e7ae7bSOr Gerlitz 67865e7ae7bSOr Gerlitz .ep_connect = iscsi_iser_ep_connect, 67965e7ae7bSOr Gerlitz .ep_poll = iscsi_iser_ep_poll, 68065e7ae7bSOr Gerlitz .ep_disconnect = iscsi_iser_ep_disconnect 68165e7ae7bSOr Gerlitz }; 68265e7ae7bSOr Gerlitz 68365e7ae7bSOr Gerlitz static int __init iser_init(void) 68465e7ae7bSOr Gerlitz { 68565e7ae7bSOr Gerlitz int err; 68665e7ae7bSOr Gerlitz 68765e7ae7bSOr Gerlitz iser_dbg("Starting iSER datamover...\n"); 68865e7ae7bSOr Gerlitz 68965e7ae7bSOr Gerlitz if (iscsi_max_lun < 1) { 69065e7ae7bSOr Gerlitz printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); 69165e7ae7bSOr Gerlitz return -EINVAL; 69265e7ae7bSOr Gerlitz } 69365e7ae7bSOr Gerlitz 69465e7ae7bSOr Gerlitz memset(&ig, 0, sizeof(struct iser_global)); 69565e7ae7bSOr Gerlitz 69665e7ae7bSOr Gerlitz ig.desc_cache = kmem_cache_create("iser_descriptors", 697f19624aaSOr Gerlitz sizeof(struct iser_tx_desc), 69865e7ae7bSOr Gerlitz 0, SLAB_HWCACHE_ALIGN, 69920c2df83SPaul Mundt NULL); 70065e7ae7bSOr Gerlitz if (ig.desc_cache == NULL) 70165e7ae7bSOr Gerlitz return -ENOMEM; 70265e7ae7bSOr Gerlitz 70365e7ae7bSOr Gerlitz /* device init is called only after the first addr resolution */ 70465e7ae7bSOr Gerlitz mutex_init(&ig.device_list_mutex); 70565e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.device_list); 70665e7ae7bSOr Gerlitz mutex_init(&ig.connlist_mutex); 70765e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.connlist); 70865e7ae7bSOr Gerlitz 70975613521SMike Christie iscsi_iser_scsi_transport = iscsi_register_transport( 71075613521SMike Christie &iscsi_iser_transport); 71175613521SMike Christie if (!iscsi_iser_scsi_transport) { 71265e7ae7bSOr Gerlitz iser_err("iscsi_register_transport failed\n"); 71365e7ae7bSOr Gerlitz err = -EINVAL; 71465e7ae7bSOr Gerlitz goto register_transport_failure; 71565e7ae7bSOr Gerlitz } 71665e7ae7bSOr Gerlitz 71765e7ae7bSOr Gerlitz return 0; 71865e7ae7bSOr Gerlitz 71965e7ae7bSOr Gerlitz register_transport_failure: 72065e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 72165e7ae7bSOr Gerlitz 72265e7ae7bSOr Gerlitz return err; 72365e7ae7bSOr Gerlitz } 72465e7ae7bSOr Gerlitz 72565e7ae7bSOr Gerlitz static void __exit iser_exit(void) 72665e7ae7bSOr Gerlitz { 72765e7ae7bSOr Gerlitz iser_dbg("Removing iSER datamover...\n"); 72865e7ae7bSOr Gerlitz iscsi_unregister_transport(&iscsi_iser_transport); 72965e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 73065e7ae7bSOr Gerlitz } 73165e7ae7bSOr Gerlitz 73265e7ae7bSOr Gerlitz module_init(iser_init); 73365e7ae7bSOr Gerlitz module_exit(iser_exit); 734