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. 83ee07d27SOr Gerlitz * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved. 965e7ae7bSOr Gerlitz * maintained by openib-general@openib.org 1065e7ae7bSOr Gerlitz * 1165e7ae7bSOr Gerlitz * This software is available to you under a choice of one of two 1265e7ae7bSOr Gerlitz * licenses. You may choose to be licensed under the terms of the GNU 1365e7ae7bSOr Gerlitz * General Public License (GPL) Version 2, available from the file 1465e7ae7bSOr Gerlitz * COPYING in the main directory of this source tree, or the 1565e7ae7bSOr Gerlitz * OpenIB.org BSD license below: 1665e7ae7bSOr Gerlitz * 1765e7ae7bSOr Gerlitz * Redistribution and use in source and binary forms, with or 1865e7ae7bSOr Gerlitz * without modification, are permitted provided that the following 1965e7ae7bSOr Gerlitz * conditions are met: 2065e7ae7bSOr Gerlitz * 2165e7ae7bSOr Gerlitz * - Redistributions of source code must retain the above 2265e7ae7bSOr Gerlitz * copyright notice, this list of conditions and the following 2365e7ae7bSOr Gerlitz * disclaimer. 2465e7ae7bSOr Gerlitz * 2565e7ae7bSOr Gerlitz * - Redistributions in binary form must reproduce the above 2665e7ae7bSOr Gerlitz * copyright notice, this list of conditions and the following 2765e7ae7bSOr Gerlitz * disclaimer in the documentation and/or other materials 2865e7ae7bSOr Gerlitz * provided with the distribution. 2965e7ae7bSOr Gerlitz * 3065e7ae7bSOr Gerlitz * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 3165e7ae7bSOr Gerlitz * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 3265e7ae7bSOr Gerlitz * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 3365e7ae7bSOr Gerlitz * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 3465e7ae7bSOr Gerlitz * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 3565e7ae7bSOr Gerlitz * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 3665e7ae7bSOr Gerlitz * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 3765e7ae7bSOr Gerlitz * SOFTWARE. 3865e7ae7bSOr Gerlitz * 3965e7ae7bSOr Gerlitz * Credits: 4065e7ae7bSOr Gerlitz * Christoph Hellwig 4165e7ae7bSOr Gerlitz * FUJITA Tomonori 4265e7ae7bSOr Gerlitz * Arne Redlich 4365e7ae7bSOr Gerlitz * Zhenyu Wang 4465e7ae7bSOr Gerlitz * Modified by: 4565e7ae7bSOr Gerlitz * Erez Zilber 4665e7ae7bSOr Gerlitz */ 4765e7ae7bSOr Gerlitz 4865e7ae7bSOr Gerlitz #include <linux/types.h> 4965e7ae7bSOr Gerlitz #include <linux/list.h> 5065e7ae7bSOr Gerlitz #include <linux/hardirq.h> 5165e7ae7bSOr Gerlitz #include <linux/kfifo.h> 5265e7ae7bSOr Gerlitz #include <linux/blkdev.h> 5365e7ae7bSOr Gerlitz #include <linux/init.h> 5465e7ae7bSOr Gerlitz #include <linux/ioctl.h> 5565e7ae7bSOr Gerlitz #include <linux/cdev.h> 5665e7ae7bSOr Gerlitz #include <linux/in.h> 5765e7ae7bSOr Gerlitz #include <linux/net.h> 5865e7ae7bSOr Gerlitz #include <linux/scatterlist.h> 5965e7ae7bSOr Gerlitz #include <linux/delay.h> 605a0e3ad6STejun Heo #include <linux/slab.h> 61e4dd23d7SPaul Gortmaker #include <linux/module.h> 6265e7ae7bSOr Gerlitz 6365e7ae7bSOr Gerlitz #include <net/sock.h> 6465e7ae7bSOr Gerlitz 6565e7ae7bSOr Gerlitz #include <asm/uaccess.h> 6665e7ae7bSOr Gerlitz 6765e7ae7bSOr Gerlitz #include <scsi/scsi_cmnd.h> 6865e7ae7bSOr Gerlitz #include <scsi/scsi_device.h> 6965e7ae7bSOr Gerlitz #include <scsi/scsi_eh.h> 7065e7ae7bSOr Gerlitz #include <scsi/scsi_tcq.h> 7165e7ae7bSOr Gerlitz #include <scsi/scsi_host.h> 7265e7ae7bSOr Gerlitz #include <scsi/scsi.h> 7365e7ae7bSOr Gerlitz #include <scsi/scsi_transport_iscsi.h> 7465e7ae7bSOr Gerlitz 7565e7ae7bSOr Gerlitz #include "iscsi_iser.h" 7665e7ae7bSOr Gerlitz 77c1d786e6SRoi Dayan MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover"); 7865e7ae7bSOr Gerlitz MODULE_LICENSE("Dual BSD/GPL"); 7965e7ae7bSOr Gerlitz MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); 80c1d786e6SRoi Dayan MODULE_VERSION(DRV_VER); 8165e7ae7bSOr Gerlitz 82db0a6cbdSJenny Falkovich static struct scsi_host_template iscsi_iser_sht; 83db0a6cbdSJenny Falkovich static struct iscsi_transport iscsi_iser_transport; 84db0a6cbdSJenny Falkovich static struct scsi_transport_template *iscsi_iser_scsi_transport; 85b73c3adaSAriel Nahum static struct workqueue_struct *release_wq; 8665e7ae7bSOr Gerlitz struct iser_global ig; 8765e7ae7bSOr Gerlitz 88db0a6cbdSJenny Falkovich int iser_debug_level = 0; 89db0a6cbdSJenny Falkovich module_param_named(debug_level, iser_debug_level, int, S_IRUGO | S_IWUSR); 90db0a6cbdSJenny Falkovich MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); 91db0a6cbdSJenny Falkovich 92db0a6cbdSJenny Falkovich static unsigned int iscsi_max_lun = 512; 93db0a6cbdSJenny Falkovich module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); 94db0a6cbdSJenny Falkovich MODULE_PARM_DESC(max_lun, "Max LUNs to allow per session (default:512"); 95db0a6cbdSJenny Falkovich 96db0a6cbdSJenny Falkovich bool iser_pi_enable = false; 97db0a6cbdSJenny Falkovich module_param_named(pi_enable, iser_pi_enable, bool, S_IRUGO); 98db0a6cbdSJenny Falkovich MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)"); 99db0a6cbdSJenny Falkovich 100db0a6cbdSJenny Falkovich int iser_pi_guard; 101db0a6cbdSJenny Falkovich module_param_named(pi_guard, iser_pi_guard, int, S_IRUGO); 102db0a6cbdSJenny Falkovich MODULE_PARM_DESC(pi_guard, "T10-PI guard_type [deprecated]"); 103db0a6cbdSJenny Falkovich 104dc05ac36SSagi Grimberg /* 105dc05ac36SSagi Grimberg * iscsi_iser_recv() - Process a successfull recv completion 106dc05ac36SSagi Grimberg * @conn: iscsi connection 107dc05ac36SSagi Grimberg * @hdr: iscsi header 108dc05ac36SSagi Grimberg * @rx_data: buffer containing receive data payload 109dc05ac36SSagi Grimberg * @rx_data_len: length of rx_data 110dc05ac36SSagi Grimberg * 111dc05ac36SSagi Grimberg * Notes: In case of data length errors or iscsi PDU completion failures 112dc05ac36SSagi Grimberg * this routine will signal iscsi layer of connection failure. 113dc05ac36SSagi Grimberg */ 11465e7ae7bSOr Gerlitz void 115dc05ac36SSagi Grimberg iscsi_iser_recv(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 116dc05ac36SSagi Grimberg char *rx_data, int rx_data_len) 11765e7ae7bSOr Gerlitz { 11865e7ae7bSOr Gerlitz int rc = 0; 11965e7ae7bSOr Gerlitz int datalen; 12065e7ae7bSOr Gerlitz int ahslen; 12165e7ae7bSOr Gerlitz 12265e7ae7bSOr Gerlitz /* verify PDU length */ 12365e7ae7bSOr Gerlitz datalen = ntoh24(hdr->dlength); 124200ae1a0SOr Gerlitz if (datalen > rx_data_len || (datalen + 4) < rx_data_len) { 125200ae1a0SOr Gerlitz iser_err("wrong datalen %d (hdr), %d (IB)\n", 12665e7ae7bSOr Gerlitz datalen, rx_data_len); 12765e7ae7bSOr Gerlitz rc = ISCSI_ERR_DATALEN; 12865e7ae7bSOr Gerlitz goto error; 12965e7ae7bSOr Gerlitz } 13065e7ae7bSOr Gerlitz 131200ae1a0SOr Gerlitz if (datalen != rx_data_len) 132200ae1a0SOr Gerlitz iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", 133200ae1a0SOr Gerlitz datalen, rx_data_len); 134200ae1a0SOr Gerlitz 13565e7ae7bSOr Gerlitz /* read AHS */ 13665e7ae7bSOr Gerlitz ahslen = hdr->hlength * 4; 13765e7ae7bSOr Gerlitz 13865e7ae7bSOr Gerlitz rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 13965e7ae7bSOr Gerlitz if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 14065e7ae7bSOr Gerlitz goto error; 14165e7ae7bSOr Gerlitz 14265e7ae7bSOr Gerlitz return; 14365e7ae7bSOr Gerlitz error: 14465e7ae7bSOr Gerlitz iscsi_conn_failure(conn, rc); 14565e7ae7bSOr Gerlitz } 14665e7ae7bSOr Gerlitz 147dc05ac36SSagi Grimberg /** 148dc05ac36SSagi Grimberg * iscsi_iser_pdu_alloc() - allocate an iscsi-iser PDU 149dc05ac36SSagi Grimberg * @task: iscsi task 150dc05ac36SSagi Grimberg * @opcode: iscsi command opcode 151dc05ac36SSagi Grimberg * 152dc05ac36SSagi Grimberg * Netes: This routine can't fail, just assign iscsi task 153dc05ac36SSagi Grimberg * hdr and max hdr size. 154dc05ac36SSagi Grimberg */ 155dc05ac36SSagi Grimberg static int 156dc05ac36SSagi Grimberg iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) 1570f9c7449SMike Christie { 1580f9c7449SMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 1590f9c7449SMike Christie 1600f9c7449SMike Christie task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; 1610f9c7449SMike Christie task->hdr_max = sizeof(iser_task->desc.iscsi_header); 162dc05ac36SSagi Grimberg 1630f9c7449SMike Christie return 0; 1640f9c7449SMike Christie } 16565e7ae7bSOr Gerlitz 1667414dde0SSagi Grimberg /** 1677414dde0SSagi Grimberg * iser_initialize_task_headers() - Initialize task headers 1687414dde0SSagi Grimberg * @task: iscsi task 1697414dde0SSagi Grimberg * @tx_desc: iser tx descriptor 1707414dde0SSagi Grimberg * 1717414dde0SSagi Grimberg * Notes: 1727414dde0SSagi Grimberg * This routine may race with iser teardown flow for scsi 1737414dde0SSagi Grimberg * error handling TMFs. So for TMF we should acquire the 1747414dde0SSagi Grimberg * state mutex to avoid dereferencing the IB device which 1757414dde0SSagi Grimberg * may have already been terminated. 1767414dde0SSagi Grimberg */ 1777414dde0SSagi Grimberg int 1787414dde0SSagi Grimberg iser_initialize_task_headers(struct iscsi_task *task, 179f19624aaSOr Gerlitz struct iser_tx_desc *tx_desc) 180f19624aaSOr Gerlitz { 1815716af6eSSagi Grimberg struct iser_conn *iser_conn = task->conn->dd_data; 182a4ee3539SSagi Grimberg struct iser_device *device = iser_conn->ib_conn.device; 183f19624aaSOr Gerlitz struct iscsi_iser_task *iser_task = task->dd_data; 184f19624aaSOr Gerlitz u64 dma_addr; 1857414dde0SSagi Grimberg const bool mgmt_task = !task->sc && !in_interrupt(); 1867414dde0SSagi Grimberg int ret = 0; 1877414dde0SSagi Grimberg 1887414dde0SSagi Grimberg if (unlikely(mgmt_task)) 1897414dde0SSagi Grimberg mutex_lock(&iser_conn->state_mutex); 1907414dde0SSagi Grimberg 1917414dde0SSagi Grimberg if (unlikely(iser_conn->state != ISER_CONN_UP)) { 1927414dde0SSagi Grimberg ret = -ENODEV; 1937414dde0SSagi Grimberg goto out; 1947414dde0SSagi Grimberg } 195f19624aaSOr Gerlitz 196f19624aaSOr Gerlitz dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, 197f19624aaSOr Gerlitz ISER_HEADERS_LEN, DMA_TO_DEVICE); 1987414dde0SSagi Grimberg if (ib_dma_mapping_error(device->ib_device, dma_addr)) { 1997414dde0SSagi Grimberg ret = -ENOMEM; 2007414dde0SSagi Grimberg goto out; 2017414dde0SSagi Grimberg } 202f19624aaSOr Gerlitz 203f19624aaSOr Gerlitz tx_desc->dma_addr = dma_addr; 204f19624aaSOr Gerlitz tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 205f19624aaSOr Gerlitz tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 206f19624aaSOr Gerlitz tx_desc->tx_sg[0].lkey = device->mr->lkey; 207f19624aaSOr Gerlitz 2085716af6eSSagi Grimberg iser_task->iser_conn = iser_conn; 2097414dde0SSagi Grimberg out: 2107414dde0SSagi Grimberg if (unlikely(mgmt_task)) 2117414dde0SSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 2127414dde0SSagi Grimberg 2137414dde0SSagi Grimberg return ret; 214f19624aaSOr Gerlitz } 215dc05ac36SSagi Grimberg 21665e7ae7bSOr Gerlitz /** 217dc05ac36SSagi Grimberg * iscsi_iser_task_init() - Initialize iscsi-iser task 2182261ec3dSMike Christie * @task: iscsi task 21965e7ae7bSOr Gerlitz * 2202261ec3dSMike Christie * Initialize the task for the scsi command or mgmt command. 221dc05ac36SSagi Grimberg * 222dc05ac36SSagi Grimberg * Return: Returns zero on success or -ENOMEM when failing 223dc05ac36SSagi Grimberg * to init task headers (dma mapping error). 2242747fdb2SMike Christie */ 225a8ac6311SOlaf Kirch static int 2262261ec3dSMike Christie iscsi_iser_task_init(struct iscsi_task *task) 22765e7ae7bSOr Gerlitz { 2282261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 2297414dde0SSagi Grimberg int ret; 23065e7ae7bSOr Gerlitz 2317414dde0SSagi Grimberg ret = iser_initialize_task_headers(task, &iser_task->desc); 2327414dde0SSagi Grimberg if (ret) { 2337414dde0SSagi Grimberg iser_err("Failed to init task %p, err = %d\n", 2347414dde0SSagi Grimberg iser_task, ret); 2357414dde0SSagi Grimberg return ret; 2367414dde0SSagi Grimberg } 237f19624aaSOr Gerlitz 2382261ec3dSMike Christie /* mgmt task */ 239f19624aaSOr Gerlitz if (!task->sc) 2402747fdb2SMike Christie return 0; 2412747fdb2SMike Christie 2422261ec3dSMike Christie iser_task->command_sent = 0; 2432261ec3dSMike Christie iser_task_rdma_init(iser_task); 244177e31bdSSagi Grimberg iser_task->sc = task->sc; 245177e31bdSSagi Grimberg 246a8ac6311SOlaf Kirch return 0; 24765e7ae7bSOr Gerlitz } 24865e7ae7bSOr Gerlitz 24965e7ae7bSOr Gerlitz /** 250dc05ac36SSagi Grimberg * iscsi_iser_mtask_xmit() - xmit management (immediate) task 25165e7ae7bSOr Gerlitz * @conn: iscsi connection 2522261ec3dSMike Christie * @task: task management task 25365e7ae7bSOr Gerlitz * 25465e7ae7bSOr Gerlitz * Notes: 25565e7ae7bSOr Gerlitz * The function can return -EAGAIN in which case caller must 25665e7ae7bSOr Gerlitz * call it again later, or recover. '0' return code means successful 25765e7ae7bSOr Gerlitz * xmit. 25865e7ae7bSOr Gerlitz * 25965e7ae7bSOr Gerlitz **/ 26065e7ae7bSOr Gerlitz static int 2612261ec3dSMike Christie iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 26265e7ae7bSOr Gerlitz { 26365e7ae7bSOr Gerlitz int error = 0; 26465e7ae7bSOr Gerlitz 265962b4b52SOr Gerlitz iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); 26665e7ae7bSOr Gerlitz 2672261ec3dSMike Christie error = iser_send_control(conn, task); 26865e7ae7bSOr Gerlitz 2692261ec3dSMike Christie /* since iser xmits control with zero copy, tasks can not be recycled 27065e7ae7bSOr Gerlitz * right after sending them. 27165e7ae7bSOr Gerlitz * The recycling scheme is based on whether a response is expected 2722261ec3dSMike Christie * - if yes, the task is recycled at iscsi_complete_pdu 2732261ec3dSMike Christie * - if no, the task is recycled at iser_snd_completion 27465e7ae7bSOr Gerlitz */ 27565e7ae7bSOr Gerlitz return error; 27665e7ae7bSOr Gerlitz } 27765e7ae7bSOr Gerlitz 27865e7ae7bSOr Gerlitz static int 2792747fdb2SMike Christie iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 2802261ec3dSMike Christie struct iscsi_task *task) 28165e7ae7bSOr Gerlitz { 2820f9c7449SMike Christie struct iscsi_r2t_info *r2t = &task->unsol_r2t; 28365e7ae7bSOr Gerlitz struct iscsi_data hdr; 28465e7ae7bSOr Gerlitz int error = 0; 28565e7ae7bSOr Gerlitz 28665e7ae7bSOr Gerlitz /* Send data-out PDUs while there's still unsolicited data to send */ 2870f9c7449SMike Christie while (iscsi_task_has_unsol_data(task)) { 2880f9c7449SMike Christie iscsi_prep_data_out_pdu(task, r2t, &hdr); 28948a237a2SMike Christie iser_dbg("Sending data-out: itt 0x%x, data count %d\n", 2900f9c7449SMike Christie hdr.itt, r2t->data_count); 29165e7ae7bSOr Gerlitz 29265e7ae7bSOr Gerlitz /* the buffer description has been passed with the command */ 29365e7ae7bSOr Gerlitz /* Send the command */ 2942261ec3dSMike Christie error = iser_send_data_out(conn, task, &hdr); 29565e7ae7bSOr Gerlitz if (error) { 2960f9c7449SMike Christie r2t->datasn--; 2972747fdb2SMike Christie goto iscsi_iser_task_xmit_unsol_data_exit; 29865e7ae7bSOr Gerlitz } 2990f9c7449SMike Christie r2t->sent += r2t->data_count; 30048a237a2SMike Christie iser_dbg("Need to send %d more as data-out PDUs\n", 3010f9c7449SMike Christie r2t->data_length - r2t->sent); 30265e7ae7bSOr Gerlitz } 30365e7ae7bSOr Gerlitz 3042747fdb2SMike Christie iscsi_iser_task_xmit_unsol_data_exit: 30565e7ae7bSOr Gerlitz return error; 30665e7ae7bSOr Gerlitz } 30765e7ae7bSOr Gerlitz 308dc05ac36SSagi Grimberg /** 309dc05ac36SSagi Grimberg * iscsi_iser_task_xmit() - xmit iscsi-iser task 310dc05ac36SSagi Grimberg * @task: iscsi task 311dc05ac36SSagi Grimberg * 312dc05ac36SSagi Grimberg * Return: zero on success or escalates $error on failure. 313dc05ac36SSagi Grimberg */ 31465e7ae7bSOr Gerlitz static int 3152261ec3dSMike Christie iscsi_iser_task_xmit(struct iscsi_task *task) 31665e7ae7bSOr Gerlitz { 3172261ec3dSMike Christie struct iscsi_conn *conn = task->conn; 3182261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 31965e7ae7bSOr Gerlitz int error = 0; 32065e7ae7bSOr Gerlitz 3212261ec3dSMike Christie if (!task->sc) 3222261ec3dSMike Christie return iscsi_iser_mtask_xmit(conn, task); 3232747fdb2SMike Christie 3242261ec3dSMike Christie if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 3252261ec3dSMike Christie BUG_ON(scsi_bufflen(task->sc) == 0); 32677a23c21SMike Christie 32748a237a2SMike Christie iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", 3282261ec3dSMike Christie task->itt, scsi_bufflen(task->sc), 3290f9c7449SMike Christie task->imm_count, task->unsol_r2t.data_length); 33077a23c21SMike Christie } 33177a23c21SMike Christie 332962b4b52SOr Gerlitz iser_dbg("ctask xmit [cid %d itt 0x%x]\n", 3332261ec3dSMike Christie conn->id, task->itt); 33465e7ae7bSOr Gerlitz 33565e7ae7bSOr Gerlitz /* Send the cmd PDU */ 3362261ec3dSMike Christie if (!iser_task->command_sent) { 3372261ec3dSMike Christie error = iser_send_command(conn, task); 33865e7ae7bSOr Gerlitz if (error) 3392747fdb2SMike Christie goto iscsi_iser_task_xmit_exit; 3402261ec3dSMike Christie iser_task->command_sent = 1; 34165e7ae7bSOr Gerlitz } 34265e7ae7bSOr Gerlitz 34365e7ae7bSOr Gerlitz /* Send unsolicited data-out PDU(s) if necessary */ 3440f9c7449SMike Christie if (iscsi_task_has_unsol_data(task)) 3452261ec3dSMike Christie error = iscsi_iser_task_xmit_unsol_data(conn, task); 34665e7ae7bSOr Gerlitz 3472747fdb2SMike Christie iscsi_iser_task_xmit_exit: 34865e7ae7bSOr Gerlitz return error; 34965e7ae7bSOr Gerlitz } 35065e7ae7bSOr Gerlitz 351dc05ac36SSagi Grimberg /** 352dc05ac36SSagi Grimberg * iscsi_iser_cleanup_task() - cleanup an iscsi-iser task 353dc05ac36SSagi Grimberg * @task: iscsi task 354dc05ac36SSagi Grimberg * 355dc05ac36SSagi Grimberg * Notes: In case the RDMA device is already NULL (might have 356dc05ac36SSagi Grimberg * been removed in DEVICE_REMOVAL CM event it will bail-out 357dc05ac36SSagi Grimberg * without doing dma unmapping. 358dc05ac36SSagi Grimberg */ 3590f9c7449SMike Christie static void iscsi_iser_cleanup_task(struct iscsi_task *task) 36065e7ae7bSOr Gerlitz { 3612261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 36252439540SOr Gerlitz struct iser_tx_desc *tx_desc = &iser_task->desc; 3635716af6eSSagi Grimberg struct iser_conn *iser_conn = task->conn->dd_data; 364a4ee3539SSagi Grimberg struct iser_device *device = iser_conn->ib_conn.device; 36552439540SOr Gerlitz 3663a940dafSSagi Grimberg /* DEVICE_REMOVAL event might have already released the device */ 3673a940dafSSagi Grimberg if (!device) 3683a940dafSSagi Grimberg return; 3693a940dafSSagi Grimberg 37052439540SOr Gerlitz ib_dma_unmap_single(device->ib_device, 37152439540SOr Gerlitz tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 37265e7ae7bSOr Gerlitz 373b3cd5050SMike Christie /* mgmt tasks do not need special cleanup */ 374b3cd5050SMike Christie if (!task->sc) 3752747fdb2SMike Christie return; 37665e7ae7bSOr Gerlitz 3772261ec3dSMike Christie if (iser_task->status == ISER_TASK_STATUS_STARTED) { 3782261ec3dSMike Christie iser_task->status = ISER_TASK_STATUS_COMPLETED; 3792261ec3dSMike Christie iser_task_rdma_finalize(iser_task); 38065e7ae7bSOr Gerlitz } 38165e7ae7bSOr Gerlitz } 38265e7ae7bSOr Gerlitz 383dc05ac36SSagi Grimberg /** 384dc05ac36SSagi Grimberg * iscsi_iser_check_protection() - check protection information status of task. 385dc05ac36SSagi Grimberg * @task: iscsi task 386dc05ac36SSagi Grimberg * @sector: error sector if exsists (output) 387dc05ac36SSagi Grimberg * 388dc05ac36SSagi Grimberg * Return: zero if no data-integrity errors have occured 389dc05ac36SSagi Grimberg * 0x1: data-integrity error occured in the guard-block 390dc05ac36SSagi Grimberg * 0x2: data-integrity error occured in the reference tag 391dc05ac36SSagi Grimberg * 0x3: data-integrity error occured in the application tag 392dc05ac36SSagi Grimberg * 393dc05ac36SSagi Grimberg * In addition the error sector is marked. 394dc05ac36SSagi Grimberg */ 395dc05ac36SSagi Grimberg static u8 396dc05ac36SSagi Grimberg iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector) 3970a7a08adSSagi Grimberg { 3980a7a08adSSagi Grimberg struct iscsi_iser_task *iser_task = task->dd_data; 3990a7a08adSSagi Grimberg 4000a7a08adSSagi Grimberg if (iser_task->dir[ISER_DIR_IN]) 4010a7a08adSSagi Grimberg return iser_check_task_pi_status(iser_task, ISER_DIR_IN, 4020a7a08adSSagi Grimberg sector); 4030a7a08adSSagi Grimberg else 4040a7a08adSSagi Grimberg return iser_check_task_pi_status(iser_task, ISER_DIR_OUT, 4050a7a08adSSagi Grimberg sector); 4060a7a08adSSagi Grimberg } 4070a7a08adSSagi Grimberg 408dc05ac36SSagi Grimberg /** 409dc05ac36SSagi Grimberg * iscsi_iser_conn_create() - create a new iscsi-iser connection 410dc05ac36SSagi Grimberg * @cls_session: iscsi class connection 411dc05ac36SSagi Grimberg * @conn_idx: connection index within the session (for MCS) 412dc05ac36SSagi Grimberg * 413dc05ac36SSagi Grimberg * Return: iscsi_cls_conn when iscsi_conn_setup succeeds or NULL 414dc05ac36SSagi Grimberg * otherwise. 415dc05ac36SSagi Grimberg */ 41665e7ae7bSOr Gerlitz static struct iscsi_cls_conn * 417dc05ac36SSagi Grimberg iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, 418dc05ac36SSagi Grimberg uint32_t conn_idx) 41965e7ae7bSOr Gerlitz { 42065e7ae7bSOr Gerlitz struct iscsi_conn *conn; 42165e7ae7bSOr Gerlitz struct iscsi_cls_conn *cls_conn; 42265e7ae7bSOr Gerlitz 4234667f5dfSAriel Nahum cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx); 42465e7ae7bSOr Gerlitz if (!cls_conn) 42565e7ae7bSOr Gerlitz return NULL; 42665e7ae7bSOr Gerlitz conn = cls_conn->dd_data; 42765e7ae7bSOr Gerlitz 42865e7ae7bSOr Gerlitz /* 42965e7ae7bSOr Gerlitz * due to issues with the login code re iser sematics 43065e7ae7bSOr Gerlitz * this not set in iscsi_conn_setup - FIXME 43165e7ae7bSOr Gerlitz */ 432bcc60c38SOr Gerlitz conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; 43365e7ae7bSOr Gerlitz 43465e7ae7bSOr Gerlitz return cls_conn; 43565e7ae7bSOr Gerlitz } 43665e7ae7bSOr Gerlitz 437dc05ac36SSagi Grimberg /** 438dc05ac36SSagi Grimberg * iscsi_iser_conn_bind() - bind iscsi and iser connection structures 439dc05ac36SSagi Grimberg * @cls_session: iscsi class session 440dc05ac36SSagi Grimberg * @cls_conn: iscsi class connection 441dc05ac36SSagi Grimberg * @transport_eph: transport end-point handle 442dc05ac36SSagi Grimberg * @is_leading: indicate if this is the session leading connection (MCS) 443dc05ac36SSagi Grimberg * 444dc05ac36SSagi Grimberg * Return: zero on success, $error if iscsi_conn_bind fails and 445dc05ac36SSagi Grimberg * -EINVAL in case end-point doesn't exsits anymore or iser connection 446dc05ac36SSagi Grimberg * state is not UP (teardown already started). 447dc05ac36SSagi Grimberg */ 44865e7ae7bSOr Gerlitz static int 44965e7ae7bSOr Gerlitz iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 450dc05ac36SSagi Grimberg struct iscsi_cls_conn *cls_conn, 451dc05ac36SSagi Grimberg uint64_t transport_eph, 45265e7ae7bSOr Gerlitz int is_leading) 45365e7ae7bSOr Gerlitz { 45465e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 4555716af6eSSagi Grimberg struct iser_conn *iser_conn; 456412eeafaSMike Christie struct iscsi_endpoint *ep; 45765e7ae7bSOr Gerlitz int error; 45865e7ae7bSOr Gerlitz 45965e7ae7bSOr Gerlitz error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 46065e7ae7bSOr Gerlitz if (error) 46165e7ae7bSOr Gerlitz return error; 46265e7ae7bSOr Gerlitz 46365e7ae7bSOr Gerlitz /* the transport ep handle comes from user space so it must be 46465e7ae7bSOr Gerlitz * verified against the global ib connections list */ 465412eeafaSMike Christie ep = iscsi_lookup_endpoint(transport_eph); 466412eeafaSMike Christie if (!ep) { 46765e7ae7bSOr Gerlitz iser_err("can't bind eph %llx\n", 46865e7ae7bSOr Gerlitz (unsigned long long)transport_eph); 46965e7ae7bSOr Gerlitz return -EINVAL; 47065e7ae7bSOr Gerlitz } 4715716af6eSSagi Grimberg iser_conn = ep->dd_data; 472412eeafaSMike Christie 4735716af6eSSagi Grimberg mutex_lock(&iser_conn->state_mutex); 4745716af6eSSagi Grimberg if (iser_conn->state != ISER_CONN_UP) { 47591eb1df3SSagi Grimberg error = -EINVAL; 47691eb1df3SSagi Grimberg iser_err("iser_conn %p state is %d, teardown started\n", 4775716af6eSSagi Grimberg iser_conn, iser_conn->state); 47891eb1df3SSagi Grimberg goto out; 47991eb1df3SSagi Grimberg } 48091eb1df3SSagi Grimberg 4815716af6eSSagi Grimberg error = iser_alloc_rx_descriptors(iser_conn, conn->session); 48291eb1df3SSagi Grimberg if (error) 48391eb1df3SSagi Grimberg goto out; 48489e984e2SOr Gerlitz 48565e7ae7bSOr Gerlitz /* binds the iSER connection retrieved from the previously 48665e7ae7bSOr Gerlitz * connected ep_handle to the iSCSI layer connection. exchanges 48765e7ae7bSOr Gerlitz * connection pointers */ 4885716af6eSSagi Grimberg iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn); 4894667f5dfSAriel Nahum 4905716af6eSSagi Grimberg conn->dd_data = iser_conn; 4915716af6eSSagi Grimberg iser_conn->iscsi_conn = conn; 4924667f5dfSAriel Nahum 49391eb1df3SSagi Grimberg out: 4945716af6eSSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 49591eb1df3SSagi Grimberg return error; 49665e7ae7bSOr Gerlitz } 49765e7ae7bSOr Gerlitz 498dc05ac36SSagi Grimberg /** 499dc05ac36SSagi Grimberg * iscsi_iser_conn_start() - start iscsi-iser connection 500dc05ac36SSagi Grimberg * @cls_conn: iscsi class connection 501dc05ac36SSagi Grimberg * 502dc05ac36SSagi Grimberg * Notes: Here iser intialize (or re-initialize) stop_completion as 503dc05ac36SSagi Grimberg * from this point iscsi must call conn_stop in session/connection 504dc05ac36SSagi Grimberg * teardown so iser transport must wait for it. 505dc05ac36SSagi Grimberg */ 506b73c3adaSAriel Nahum static int 507b73c3adaSAriel Nahum iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 508b73c3adaSAriel Nahum { 509b73c3adaSAriel Nahum struct iscsi_conn *iscsi_conn; 5105716af6eSSagi Grimberg struct iser_conn *iser_conn; 511b73c3adaSAriel Nahum 512b73c3adaSAriel Nahum iscsi_conn = cls_conn->dd_data; 5135716af6eSSagi Grimberg iser_conn = iscsi_conn->dd_data; 5145716af6eSSagi Grimberg reinit_completion(&iser_conn->stop_completion); 515b73c3adaSAriel Nahum 516b73c3adaSAriel Nahum return iscsi_conn_start(cls_conn); 517b73c3adaSAriel Nahum } 518b73c3adaSAriel Nahum 519dc05ac36SSagi Grimberg /** 520dc05ac36SSagi Grimberg * iscsi_iser_conn_stop() - stop iscsi-iser connection 521dc05ac36SSagi Grimberg * @cls_conn: iscsi class connection 522dc05ac36SSagi Grimberg * @flag: indicate if recover or terminate (passed as is) 523dc05ac36SSagi Grimberg * 524dc05ac36SSagi Grimberg * Notes: Calling iscsi_conn_stop might theoretically race with 525dc05ac36SSagi Grimberg * DEVICE_REMOVAL event and dereference a previously freed RDMA device 526dc05ac36SSagi Grimberg * handle, so we call it under iser the state lock to protect against 527dc05ac36SSagi Grimberg * this kind of race. 528dc05ac36SSagi Grimberg */ 529b40977d9SMike Christie static void 530b40977d9SMike Christie iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 531b40977d9SMike Christie { 532b40977d9SMike Christie struct iscsi_conn *conn = cls_conn->dd_data; 5335716af6eSSagi Grimberg struct iser_conn *iser_conn = conn->dd_data; 534b40977d9SMike Christie 535bba0a3c9SAriel Nahum iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn); 536b73c3adaSAriel Nahum 537913e5bf4SMike Christie /* 538913e5bf4SMike Christie * Userspace may have goofed up and not bound the connection or 539913e5bf4SMike Christie * might have only partially setup the connection. 540913e5bf4SMike Christie */ 5415716af6eSSagi Grimberg if (iser_conn) { 542ec370e2bSAriel Nahum mutex_lock(&iser_conn->state_mutex); 543ec370e2bSAriel Nahum iser_conn_terminate(iser_conn); 544f0caef6dSSagi Grimberg iscsi_conn_stop(cls_conn, flag); 545ec370e2bSAriel Nahum 546ec370e2bSAriel Nahum /* unbind */ 547ec370e2bSAriel Nahum iser_conn->iscsi_conn = NULL; 5484667f5dfSAriel Nahum conn->dd_data = NULL; 549ec370e2bSAriel Nahum 5505716af6eSSagi Grimberg complete(&iser_conn->stop_completion); 551ec370e2bSAriel Nahum mutex_unlock(&iser_conn->state_mutex); 5523a940dafSSagi Grimberg } else { 5533a940dafSSagi Grimberg iscsi_conn_stop(cls_conn, flag); 554b73c3adaSAriel Nahum } 555b40977d9SMike Christie } 556b40977d9SMike Christie 557dc05ac36SSagi Grimberg /** 558dc05ac36SSagi Grimberg * iscsi_iser_session_destroy() - destroy iscsi-iser session 559dc05ac36SSagi Grimberg * @cls_session: iscsi class session 560dc05ac36SSagi Grimberg * 561dc05ac36SSagi Grimberg * Removes and free iscsi host. 562dc05ac36SSagi Grimberg */ 563dc05ac36SSagi Grimberg static void 564dc05ac36SSagi Grimberg iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 56575613521SMike Christie { 56675613521SMike Christie struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 56775613521SMike Christie 568e5bd7b54SMike Christie iscsi_session_teardown(cls_session); 569a4804cd6SMike Christie iscsi_host_remove(shost); 570a4804cd6SMike Christie iscsi_host_free(shost); 57175613521SMike Christie } 57265e7ae7bSOr Gerlitz 5736192d4e6SSagi Grimberg static inline unsigned int 5746192d4e6SSagi Grimberg iser_dif_prot_caps(int prot_caps) 5756192d4e6SSagi Grimberg { 5765bb6e543SSagi Grimberg return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? 5775bb6e543SSagi Grimberg SHOST_DIF_TYPE1_PROTECTION | SHOST_DIX_TYPE0_PROTECTION | 5786192d4e6SSagi Grimberg SHOST_DIX_TYPE1_PROTECTION : 0) | 5795bb6e543SSagi Grimberg ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? 5805bb6e543SSagi Grimberg SHOST_DIF_TYPE2_PROTECTION | SHOST_DIX_TYPE2_PROTECTION : 0) | 5815bb6e543SSagi Grimberg ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? 5825bb6e543SSagi Grimberg SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE3_PROTECTION : 0); 5836192d4e6SSagi Grimberg } 5846192d4e6SSagi Grimberg 585dc05ac36SSagi Grimberg /** 586dc05ac36SSagi Grimberg * iscsi_iser_session_create() - create an iscsi-iser session 587dc05ac36SSagi Grimberg * @ep: iscsi end-point handle 588dc05ac36SSagi Grimberg * @cmds_max: maximum commands in this session 589dc05ac36SSagi Grimberg * @qdepth: session command queue depth 590dc05ac36SSagi Grimberg * @initial_cmdsn: initiator command sequnce number 591dc05ac36SSagi Grimberg * 592dc05ac36SSagi Grimberg * Allocates and adds a scsi host, expose DIF supprot if 593dc05ac36SSagi Grimberg * exists, and sets up an iscsi session. 594dc05ac36SSagi Grimberg */ 59565e7ae7bSOr Gerlitz static struct iscsi_cls_session * 596412eeafaSMike Christie iscsi_iser_session_create(struct iscsi_endpoint *ep, 5971548271eSMike Christie uint16_t cmds_max, uint16_t qdepth, 5985e7facb7SMike Christie uint32_t initial_cmdsn) 59965e7ae7bSOr Gerlitz { 60065e7ae7bSOr Gerlitz struct iscsi_cls_session *cls_session; 60165e7ae7bSOr Gerlitz struct iscsi_session *session; 602412eeafaSMike Christie struct Scsi_Host *shost; 6035716af6eSSagi Grimberg struct iser_conn *iser_conn = NULL; 604a4ee3539SSagi Grimberg struct ib_conn *ib_conn; 605f4641ef7SMinh Tran u16 max_cmds; 60675613521SMike Christie 607962b4b52SOr Gerlitz shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); 60875613521SMike Christie if (!shost) 60975613521SMike Christie return NULL; 61075613521SMike Christie shost->transportt = iscsi_iser_scsi_transport; 611b7f04513SShlomo Pongratz shost->cmd_per_lun = qdepth; 61275613521SMike Christie shost->max_lun = iscsi_max_lun; 61375613521SMike Christie shost->max_id = 0; 61475613521SMike Christie shost->max_channel = 0; 61575613521SMike Christie shost->max_cmd_len = 16; 61675613521SMike Christie 617412eeafaSMike Christie /* 618412eeafaSMike Christie * older userspace tools (before 2.0-870) did not pass us 619412eeafaSMike Christie * the leading conn's ep so this will be NULL; 620412eeafaSMike Christie */ 6216192d4e6SSagi Grimberg if (ep) { 6225716af6eSSagi Grimberg iser_conn = ep->dd_data; 623f4641ef7SMinh Tran max_cmds = iser_conn->max_cmds; 6243f562a0bSAriel Nahum 6253f562a0bSAriel Nahum mutex_lock(&iser_conn->state_mutex); 6263f562a0bSAriel Nahum if (iser_conn->state != ISER_CONN_UP) { 6273f562a0bSAriel Nahum iser_err("iser conn %p already started teardown\n", 6283f562a0bSAriel Nahum iser_conn); 6293f562a0bSAriel Nahum mutex_unlock(&iser_conn->state_mutex); 6303f562a0bSAriel Nahum goto free_host; 6313f562a0bSAriel Nahum } 6323f562a0bSAriel Nahum 633a4ee3539SSagi Grimberg ib_conn = &iser_conn->ib_conn; 634a4ee3539SSagi Grimberg if (ib_conn->pi_support) { 635a4ee3539SSagi Grimberg u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap; 6366192d4e6SSagi Grimberg 6376192d4e6SSagi Grimberg scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps)); 6385bb6e543SSagi Grimberg scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP | 6395bb6e543SSagi Grimberg SHOST_DIX_GUARD_CRC); 6406192d4e6SSagi Grimberg } 6413f562a0bSAriel Nahum 6427854550aSSteve Wise /* 6437854550aSSteve Wise * Limit the sg_tablesize and max_sectors based on the device 6447854550aSSteve Wise * max fastreg page list length. 6457854550aSSteve Wise */ 6467854550aSSteve Wise shost->sg_tablesize = min_t(unsigned short, shost->sg_tablesize, 6477854550aSSteve Wise ib_conn->device->dev_attr.max_fast_reg_page_list_len); 6487854550aSSteve Wise shost->max_sectors = min_t(unsigned int, 6497854550aSSteve Wise 1024, (shost->sg_tablesize * PAGE_SIZE) >> 9); 6507854550aSSteve Wise 6513f562a0bSAriel Nahum if (iscsi_host_add(shost, 6523f562a0bSAriel Nahum ib_conn->device->ib_device->dma_device)) { 6533f562a0bSAriel Nahum mutex_unlock(&iser_conn->state_mutex); 6543f562a0bSAriel Nahum goto free_host; 6553f562a0bSAriel Nahum } 6563f562a0bSAriel Nahum mutex_unlock(&iser_conn->state_mutex); 657f4641ef7SMinh Tran } else { 658f4641ef7SMinh Tran max_cmds = ISER_DEF_XMIT_CMDS_MAX; 6593f562a0bSAriel Nahum if (iscsi_host_add(shost, NULL)) 66075613521SMike Christie goto free_host; 6613f562a0bSAriel Nahum } 66265e7ae7bSOr Gerlitz 663f4641ef7SMinh Tran if (cmds_max > max_cmds) { 664b7f04513SShlomo Pongratz iser_info("cmds_max changed from %u to %u\n", 665f4641ef7SMinh Tran cmds_max, max_cmds); 666f4641ef7SMinh Tran cmds_max = max_cmds; 667b7f04513SShlomo Pongratz } 668b7f04513SShlomo Pongratz 66975613521SMike Christie cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 670b7f04513SShlomo Pongratz cmds_max, 0, 6712261ec3dSMike Christie sizeof(struct iscsi_iser_task), 6727970634bSMike Christie initial_cmdsn, 0); 67365e7ae7bSOr Gerlitz if (!cls_session) 67475613521SMike Christie goto remove_host; 67575613521SMike Christie session = cls_session->dd_data; 67665e7ae7bSOr Gerlitz 6772747fdb2SMike Christie shost->can_queue = session->scsi_cmds_max; 67865e7ae7bSOr Gerlitz return cls_session; 67975613521SMike Christie 68075613521SMike Christie remove_host: 681a4804cd6SMike Christie iscsi_host_remove(shost); 68275613521SMike Christie free_host: 683a4804cd6SMike Christie iscsi_host_free(shost); 68475613521SMike Christie return NULL; 68565e7ae7bSOr Gerlitz } 68665e7ae7bSOr Gerlitz 68765e7ae7bSOr Gerlitz static int 688358ff019SMike Christie iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 689358ff019SMike Christie enum iscsi_param param, char *buf, int buflen) 69065e7ae7bSOr Gerlitz { 691358ff019SMike Christie int value; 69265e7ae7bSOr Gerlitz 69365e7ae7bSOr Gerlitz switch (param) { 69465e7ae7bSOr Gerlitz case ISCSI_PARAM_MAX_RECV_DLENGTH: 69565e7ae7bSOr Gerlitz /* TBD */ 69665e7ae7bSOr Gerlitz break; 69765e7ae7bSOr Gerlitz case ISCSI_PARAM_HDRDGST_EN: 698358ff019SMike Christie sscanf(buf, "%d", &value); 69965e7ae7bSOr Gerlitz if (value) { 700e7eeffa4SRoi Dayan iser_err("DataDigest wasn't negotiated to None\n"); 70165e7ae7bSOr Gerlitz return -EPROTO; 70265e7ae7bSOr Gerlitz } 70365e7ae7bSOr Gerlitz break; 70465e7ae7bSOr Gerlitz case ISCSI_PARAM_DATADGST_EN: 705358ff019SMike Christie sscanf(buf, "%d", &value); 70665e7ae7bSOr Gerlitz if (value) { 707e7eeffa4SRoi Dayan iser_err("DataDigest wasn't negotiated to None\n"); 70865e7ae7bSOr Gerlitz return -EPROTO; 70965e7ae7bSOr Gerlitz } 71065e7ae7bSOr Gerlitz break; 71165e7ae7bSOr Gerlitz case ISCSI_PARAM_IFMARKER_EN: 712358ff019SMike Christie sscanf(buf, "%d", &value); 71365e7ae7bSOr Gerlitz if (value) { 714e7eeffa4SRoi Dayan iser_err("IFMarker wasn't negotiated to No\n"); 71565e7ae7bSOr Gerlitz return -EPROTO; 71665e7ae7bSOr Gerlitz } 71765e7ae7bSOr Gerlitz break; 71865e7ae7bSOr Gerlitz case ISCSI_PARAM_OFMARKER_EN: 719358ff019SMike Christie sscanf(buf, "%d", &value); 72065e7ae7bSOr Gerlitz if (value) { 721e7eeffa4SRoi Dayan iser_err("OFMarker wasn't negotiated to No\n"); 72265e7ae7bSOr Gerlitz return -EPROTO; 72365e7ae7bSOr Gerlitz } 72465e7ae7bSOr Gerlitz break; 72565e7ae7bSOr Gerlitz default: 726358ff019SMike Christie return iscsi_set_param(cls_conn, param, buf, buflen); 72765e7ae7bSOr Gerlitz } 72865e7ae7bSOr Gerlitz 72965e7ae7bSOr Gerlitz return 0; 73065e7ae7bSOr Gerlitz } 73165e7ae7bSOr Gerlitz 732dc05ac36SSagi Grimberg /** 733dc05ac36SSagi Grimberg * iscsi_iser_set_param() - set class connection parameter 734dc05ac36SSagi Grimberg * @cls_conn: iscsi class connection 735dc05ac36SSagi Grimberg * @stats: iscsi stats to output 736dc05ac36SSagi Grimberg * 737dc05ac36SSagi Grimberg * Output connection statistics. 738dc05ac36SSagi Grimberg */ 73965e7ae7bSOr Gerlitz static void 74065e7ae7bSOr Gerlitz iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 74165e7ae7bSOr Gerlitz { 74265e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 74365e7ae7bSOr Gerlitz 74465e7ae7bSOr Gerlitz stats->txdata_octets = conn->txdata_octets; 74565e7ae7bSOr Gerlitz stats->rxdata_octets = conn->rxdata_octets; 74665e7ae7bSOr Gerlitz stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 74765e7ae7bSOr Gerlitz stats->dataout_pdus = conn->dataout_pdus_cnt; 74865e7ae7bSOr Gerlitz stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 74965e7ae7bSOr Gerlitz stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 75065e7ae7bSOr Gerlitz stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 75165e7ae7bSOr Gerlitz stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 75265e7ae7bSOr Gerlitz stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 75387528227SEli Dorfman stats->custom_length = 4; 75465e7ae7bSOr Gerlitz strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 75565e7ae7bSOr Gerlitz stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 75665e7ae7bSOr Gerlitz strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 75765e7ae7bSOr Gerlitz stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 75865e7ae7bSOr Gerlitz strcpy(stats->custom[2].desc, "eh_abort_cnt"); 75965e7ae7bSOr Gerlitz stats->custom[2].value = conn->eh_abort_cnt; 76087528227SEli Dorfman strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 76187528227SEli Dorfman stats->custom[3].value = conn->fmr_unalign_cnt; 76265e7ae7bSOr Gerlitz } 76365e7ae7bSOr Gerlitz 7647c53c6f8SMike Christie static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, 7657c53c6f8SMike Christie enum iscsi_param param, char *buf) 7667c53c6f8SMike Christie { 7675716af6eSSagi Grimberg struct iser_conn *iser_conn = ep->dd_data; 7687c53c6f8SMike Christie int len; 7697c53c6f8SMike Christie 7707c53c6f8SMike Christie switch (param) { 7717c53c6f8SMike Christie case ISCSI_PARAM_CONN_PORT: 7727c53c6f8SMike Christie case ISCSI_PARAM_CONN_ADDRESS: 773a4ee3539SSagi Grimberg if (!iser_conn || !iser_conn->ib_conn.cma_id) 7747c53c6f8SMike Christie return -ENOTCONN; 7757c53c6f8SMike Christie 7767c53c6f8SMike Christie return iscsi_conn_get_addr_param((struct sockaddr_storage *) 777a4ee3539SSagi Grimberg &iser_conn->ib_conn.cma_id->route.addr.dst_addr, 7787c53c6f8SMike Christie param, buf); 7797c53c6f8SMike Christie break; 7807c53c6f8SMike Christie default: 7817c53c6f8SMike Christie return -ENOSYS; 7827c53c6f8SMike Christie } 7837c53c6f8SMike Christie 7847c53c6f8SMike Christie return len; 7857c53c6f8SMike Christie } 7867c53c6f8SMike Christie 787dc05ac36SSagi Grimberg /** 788dc05ac36SSagi Grimberg * iscsi_iser_ep_connect() - Initiate iSER connection establishment 789dc05ac36SSagi Grimberg * @shost: scsi_host 790dc05ac36SSagi Grimberg * @dst_addr: destination address 791dc05ac36SSagi Grimberg * @non-blocking: indicate if routine can block 792dc05ac36SSagi Grimberg * 793dc05ac36SSagi Grimberg * Allocate an iscsi endpoint, an iser_conn structure and bind them. 794dc05ac36SSagi Grimberg * After that start RDMA connection establishment via rdma_cm. We 795dc05ac36SSagi Grimberg * don't allocate iser_conn embedded in iscsi_endpoint since in teardown 796dc05ac36SSagi Grimberg * the endpoint will be destroyed at ep_disconnect while iser_conn will 797dc05ac36SSagi Grimberg * cleanup its resources asynchronuously. 798dc05ac36SSagi Grimberg * 799dc05ac36SSagi Grimberg * Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error) 800dc05ac36SSagi Grimberg * if fails. 801dc05ac36SSagi Grimberg */ 802412eeafaSMike Christie static struct iscsi_endpoint * 80310eb0f01SMike Christie iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, 80410eb0f01SMike Christie int non_blocking) 80565e7ae7bSOr Gerlitz { 80665e7ae7bSOr Gerlitz int err; 8075716af6eSSagi Grimberg struct iser_conn *iser_conn; 808412eeafaSMike Christie struct iscsi_endpoint *ep; 80965e7ae7bSOr Gerlitz 8100a690758SAriel Nahum ep = iscsi_create_endpoint(0); 811412eeafaSMike Christie if (!ep) 812412eeafaSMike Christie return ERR_PTR(-ENOMEM); 81365e7ae7bSOr Gerlitz 8145716af6eSSagi Grimberg iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL); 8155716af6eSSagi Grimberg if (!iser_conn) { 8160a690758SAriel Nahum err = -ENOMEM; 8170a690758SAriel Nahum goto failure; 8180a690758SAriel Nahum } 8190a690758SAriel Nahum 8205716af6eSSagi Grimberg ep->dd_data = iser_conn; 8215716af6eSSagi Grimberg iser_conn->ep = ep; 8225716af6eSSagi Grimberg iser_conn_init(iser_conn); 82365e7ae7bSOr Gerlitz 8245716af6eSSagi Grimberg err = iser_connect(iser_conn, NULL, dst_addr, non_blocking); 8257d9c0de4SOr Gerlitz if (err) 8260a690758SAriel Nahum goto failure; 8277d9c0de4SOr Gerlitz 828412eeafaSMike Christie return ep; 8290a690758SAriel Nahum failure: 8300a690758SAriel Nahum iscsi_destroy_endpoint(ep); 8310a690758SAriel Nahum return ERR_PTR(err); 83265e7ae7bSOr Gerlitz } 83365e7ae7bSOr Gerlitz 834dc05ac36SSagi Grimberg /** 835dc05ac36SSagi Grimberg * iscsi_iser_ep_poll() - poll for iser connection establishment to complete 836dc05ac36SSagi Grimberg * @ep: iscsi endpoint (created at ep_connect) 837dc05ac36SSagi Grimberg * @timeout_ms: polling timeout allowed in ms. 838dc05ac36SSagi Grimberg * 839dc05ac36SSagi Grimberg * This routine boils down to waiting for up_completion signaling 840dc05ac36SSagi Grimberg * that cma_id got CONNECTED event. 841dc05ac36SSagi Grimberg * 842dc05ac36SSagi Grimberg * Return: 1 if succeeded in connection establishment, 0 if timeout expired 843dc05ac36SSagi Grimberg * (libiscsi will retry will kick in) or -1 if interrupted by signal 844dc05ac36SSagi Grimberg * or more likely iser connection state transitioned to TEMINATING or 845dc05ac36SSagi Grimberg * DOWN during the wait period. 846dc05ac36SSagi Grimberg */ 84765e7ae7bSOr Gerlitz static int 848412eeafaSMike Christie iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 84965e7ae7bSOr Gerlitz { 8505716af6eSSagi Grimberg struct iser_conn *iser_conn; 85165e7ae7bSOr Gerlitz int rc; 85265e7ae7bSOr Gerlitz 8535716af6eSSagi Grimberg iser_conn = ep->dd_data; 8545716af6eSSagi Grimberg rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion, 85565e7ae7bSOr Gerlitz msecs_to_jiffies(timeout_ms)); 85665e7ae7bSOr Gerlitz /* if conn establishment failed, return error code to iscsi */ 857504130c0SAriel Nahum if (rc == 0) { 8585716af6eSSagi Grimberg mutex_lock(&iser_conn->state_mutex); 8595716af6eSSagi Grimberg if (iser_conn->state == ISER_CONN_TERMINATING || 8605716af6eSSagi Grimberg iser_conn->state == ISER_CONN_DOWN) 86165e7ae7bSOr Gerlitz rc = -1; 8625716af6eSSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 863504130c0SAriel Nahum } 86465e7ae7bSOr Gerlitz 8655716af6eSSagi Grimberg iser_info("ib conn %p rc = %d\n", iser_conn, rc); 86665e7ae7bSOr Gerlitz 86765e7ae7bSOr Gerlitz if (rc > 0) 86865e7ae7bSOr Gerlitz return 1; /* success, this is the equivalent of POLLOUT */ 86965e7ae7bSOr Gerlitz else if (!rc) 87065e7ae7bSOr Gerlitz return 0; /* timeout */ 87165e7ae7bSOr Gerlitz else 87265e7ae7bSOr Gerlitz return rc; /* signal */ 87365e7ae7bSOr Gerlitz } 87465e7ae7bSOr Gerlitz 875dc05ac36SSagi Grimberg /** 876dc05ac36SSagi Grimberg * iscsi_iser_ep_disconnect() - Initiate connection teardown process 877dc05ac36SSagi Grimberg * @ep: iscsi endpoint handle 878dc05ac36SSagi Grimberg * 879dc05ac36SSagi Grimberg * This routine is not blocked by iser and RDMA termination process 880dc05ac36SSagi Grimberg * completion as we queue a deffered work for iser/RDMA destruction 881dc05ac36SSagi Grimberg * and cleanup or actually call it immediately in case we didn't pass 882dc05ac36SSagi Grimberg * iscsi conn bind/start stage, thus it is safe. 883dc05ac36SSagi Grimberg */ 88465e7ae7bSOr Gerlitz static void 885412eeafaSMike Christie iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 88665e7ae7bSOr Gerlitz { 8875716af6eSSagi Grimberg struct iser_conn *iser_conn; 88865e7ae7bSOr Gerlitz 8895716af6eSSagi Grimberg iser_conn = ep->dd_data; 8905716af6eSSagi Grimberg iser_info("ep %p iser conn %p state %d\n", 8915716af6eSSagi Grimberg ep, iser_conn, iser_conn->state); 8925716af6eSSagi Grimberg 8935716af6eSSagi Grimberg mutex_lock(&iser_conn->state_mutex); 8945716af6eSSagi Grimberg iser_conn_terminate(iser_conn); 895b73c3adaSAriel Nahum 896b73c3adaSAriel Nahum /* 8979a6d3234SAriel Nahum * if iser_conn and iscsi_conn are bound, we must wait for 8989a6d3234SAriel Nahum * iscsi_conn_stop and flush errors completion before freeing 8999a6d3234SAriel Nahum * the iser resources. Otherwise we are safe to free resources 9009a6d3234SAriel Nahum * immediately. 901b73c3adaSAriel Nahum */ 9025716af6eSSagi Grimberg if (iser_conn->iscsi_conn) { 9035716af6eSSagi Grimberg INIT_WORK(&iser_conn->release_work, iser_release_work); 9045716af6eSSagi Grimberg queue_work(release_wq, &iser_conn->release_work); 9055716af6eSSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 906b73c3adaSAriel Nahum } else { 9075716af6eSSagi Grimberg iser_conn->state = ISER_CONN_DOWN; 9085716af6eSSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 9095716af6eSSagi Grimberg iser_conn_release(iser_conn); 910b73c3adaSAriel Nahum } 9110a690758SAriel Nahum iscsi_destroy_endpoint(ep); 91265e7ae7bSOr Gerlitz } 91365e7ae7bSOr Gerlitz 914587a1f16SAl Viro static umode_t iser_attr_is_visible(int param_type, int param) 9153128c6c7SMike Christie { 9163128c6c7SMike Christie switch (param_type) { 917f27fb2efSMike Christie case ISCSI_HOST_PARAM: 918f27fb2efSMike Christie switch (param) { 919f27fb2efSMike Christie case ISCSI_HOST_PARAM_NETDEV_NAME: 920f27fb2efSMike Christie case ISCSI_HOST_PARAM_HWADDRESS: 921f27fb2efSMike Christie case ISCSI_HOST_PARAM_INITIATOR_NAME: 922f27fb2efSMike Christie return S_IRUGO; 923f27fb2efSMike Christie default: 924f27fb2efSMike Christie return 0; 925f27fb2efSMike Christie } 9263128c6c7SMike Christie case ISCSI_PARAM: 9273128c6c7SMike Christie switch (param) { 9283128c6c7SMike Christie case ISCSI_PARAM_MAX_RECV_DLENGTH: 9293128c6c7SMike Christie case ISCSI_PARAM_MAX_XMIT_DLENGTH: 9303128c6c7SMike Christie case ISCSI_PARAM_HDRDGST_EN: 9313128c6c7SMike Christie case ISCSI_PARAM_DATADGST_EN: 9323128c6c7SMike Christie case ISCSI_PARAM_CONN_ADDRESS: 9333128c6c7SMike Christie case ISCSI_PARAM_CONN_PORT: 9343128c6c7SMike Christie case ISCSI_PARAM_EXP_STATSN: 9353128c6c7SMike Christie case ISCSI_PARAM_PERSISTENT_ADDRESS: 9363128c6c7SMike Christie case ISCSI_PARAM_PERSISTENT_PORT: 9373128c6c7SMike Christie case ISCSI_PARAM_PING_TMO: 9383128c6c7SMike Christie case ISCSI_PARAM_RECV_TMO: 9391d063c17SMike Christie case ISCSI_PARAM_INITIAL_R2T_EN: 9401d063c17SMike Christie case ISCSI_PARAM_MAX_R2T: 9411d063c17SMike Christie case ISCSI_PARAM_IMM_DATA_EN: 9421d063c17SMike Christie case ISCSI_PARAM_FIRST_BURST: 9431d063c17SMike Christie case ISCSI_PARAM_MAX_BURST: 9441d063c17SMike Christie case ISCSI_PARAM_PDU_INORDER_EN: 9451d063c17SMike Christie case ISCSI_PARAM_DATASEQ_INORDER_EN: 9461d063c17SMike Christie case ISCSI_PARAM_TARGET_NAME: 9471d063c17SMike Christie case ISCSI_PARAM_TPGT: 9481d063c17SMike Christie case ISCSI_PARAM_USERNAME: 9491d063c17SMike Christie case ISCSI_PARAM_PASSWORD: 9501d063c17SMike Christie case ISCSI_PARAM_USERNAME_IN: 9511d063c17SMike Christie case ISCSI_PARAM_PASSWORD_IN: 9521d063c17SMike Christie case ISCSI_PARAM_FAST_ABORT: 9531d063c17SMike Christie case ISCSI_PARAM_ABORT_TMO: 9541d063c17SMike Christie case ISCSI_PARAM_LU_RESET_TMO: 9551d063c17SMike Christie case ISCSI_PARAM_TGT_RESET_TMO: 9561d063c17SMike Christie case ISCSI_PARAM_IFACE_NAME: 9571d063c17SMike Christie case ISCSI_PARAM_INITIATOR_NAME: 9586a06a4b8SOr Gerlitz case ISCSI_PARAM_DISCOVERY_SESS: 9593128c6c7SMike Christie return S_IRUGO; 9603128c6c7SMike Christie default: 9613128c6c7SMike Christie return 0; 9623128c6c7SMike Christie } 9633128c6c7SMike Christie } 9643128c6c7SMike Christie 9653128c6c7SMike Christie return 0; 9663128c6c7SMike Christie } 9673128c6c7SMike Christie 96865e7ae7bSOr Gerlitz static struct scsi_host_template iscsi_iser_sht = { 9697974392cSMike Christie .module = THIS_MODULE, 970c1d786e6SRoi Dayan .name = "iSCSI Initiator over iSER", 97165e7ae7bSOr Gerlitz .queuecommand = iscsi_queuecommand, 972db5ed4dfSChristoph Hellwig .change_queue_depth = scsi_change_queue_depth, 97365e7ae7bSOr Gerlitz .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 9748072ec2fSErez Zilber .max_sectors = 1024, 975e28f3d5bSMike Christie .cmd_per_lun = ISER_DEF_CMD_PER_LUN, 97665e7ae7bSOr Gerlitz .eh_abort_handler = iscsi_eh_abort, 97790c18f3cSErez Zilber .eh_device_reset_handler= iscsi_eh_device_reset, 978309ce156SJayamohan Kallickal .eh_target_reset_handler = iscsi_eh_recover_target, 9796b5d6c44SMike Christie .target_alloc = iscsi_target_alloc, 98065e7ae7bSOr Gerlitz .use_clustering = DISABLE_CLUSTERING, 98165e7ae7bSOr Gerlitz .proc_name = "iscsi_iser", 98265e7ae7bSOr Gerlitz .this_id = -1, 983c40ecc12SChristoph Hellwig .track_queue_depth = 1, 98465e7ae7bSOr Gerlitz }; 98565e7ae7bSOr Gerlitz 98665e7ae7bSOr Gerlitz static struct iscsi_transport iscsi_iser_transport = { 98765e7ae7bSOr Gerlitz .owner = THIS_MODULE, 98865e7ae7bSOr Gerlitz .name = "iser", 9896a06a4b8SOr Gerlitz .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO, 99065e7ae7bSOr Gerlitz /* session management */ 99165e7ae7bSOr Gerlitz .create_session = iscsi_iser_session_create, 99275613521SMike Christie .destroy_session = iscsi_iser_session_destroy, 99365e7ae7bSOr Gerlitz /* connection management */ 99465e7ae7bSOr Gerlitz .create_conn = iscsi_iser_conn_create, 99565e7ae7bSOr Gerlitz .bind_conn = iscsi_iser_conn_bind, 996b73c3adaSAriel Nahum .destroy_conn = iscsi_conn_teardown, 9973128c6c7SMike Christie .attr_is_visible = iser_attr_is_visible, 998358ff019SMike Christie .set_param = iscsi_iser_set_param, 999358ff019SMike Christie .get_conn_param = iscsi_conn_get_param, 10007c53c6f8SMike Christie .get_ep_param = iscsi_iser_get_ep_param, 1001358ff019SMike Christie .get_session_param = iscsi_session_get_param, 1002b73c3adaSAriel Nahum .start_conn = iscsi_iser_conn_start, 1003b40977d9SMike Christie .stop_conn = iscsi_iser_conn_stop, 10040801c242SMike Christie /* iscsi host params */ 10050801c242SMike Christie .get_host_param = iscsi_host_get_param, 10060801c242SMike Christie .set_host_param = iscsi_host_set_param, 100765e7ae7bSOr Gerlitz /* IO */ 100865e7ae7bSOr Gerlitz .send_pdu = iscsi_conn_send_pdu, 100965e7ae7bSOr Gerlitz .get_stats = iscsi_iser_conn_get_stats, 10102747fdb2SMike Christie .init_task = iscsi_iser_task_init, 10112747fdb2SMike Christie .xmit_task = iscsi_iser_task_xmit, 10122747fdb2SMike Christie .cleanup_task = iscsi_iser_cleanup_task, 10130f9c7449SMike Christie .alloc_pdu = iscsi_iser_pdu_alloc, 10140a7a08adSSagi Grimberg .check_protection = iscsi_iser_check_protection, 101565e7ae7bSOr Gerlitz /* recovery */ 101665e7ae7bSOr Gerlitz .session_recovery_timedout = iscsi_session_recovery_timedout, 101765e7ae7bSOr Gerlitz 101865e7ae7bSOr Gerlitz .ep_connect = iscsi_iser_ep_connect, 101965e7ae7bSOr Gerlitz .ep_poll = iscsi_iser_ep_poll, 102065e7ae7bSOr Gerlitz .ep_disconnect = iscsi_iser_ep_disconnect 102165e7ae7bSOr Gerlitz }; 102265e7ae7bSOr Gerlitz 102365e7ae7bSOr Gerlitz static int __init iser_init(void) 102465e7ae7bSOr Gerlitz { 102565e7ae7bSOr Gerlitz int err; 102665e7ae7bSOr Gerlitz 102765e7ae7bSOr Gerlitz iser_dbg("Starting iSER datamover...\n"); 102865e7ae7bSOr Gerlitz 102965e7ae7bSOr Gerlitz if (iscsi_max_lun < 1) { 10304f363882SRoi Dayan iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); 103165e7ae7bSOr Gerlitz return -EINVAL; 103265e7ae7bSOr Gerlitz } 103365e7ae7bSOr Gerlitz 103465e7ae7bSOr Gerlitz memset(&ig, 0, sizeof(struct iser_global)); 103565e7ae7bSOr Gerlitz 103665e7ae7bSOr Gerlitz ig.desc_cache = kmem_cache_create("iser_descriptors", 1037f19624aaSOr Gerlitz sizeof(struct iser_tx_desc), 103865e7ae7bSOr Gerlitz 0, SLAB_HWCACHE_ALIGN, 103920c2df83SPaul Mundt NULL); 104065e7ae7bSOr Gerlitz if (ig.desc_cache == NULL) 104165e7ae7bSOr Gerlitz return -ENOMEM; 104265e7ae7bSOr Gerlitz 104365e7ae7bSOr Gerlitz /* device init is called only after the first addr resolution */ 104465e7ae7bSOr Gerlitz mutex_init(&ig.device_list_mutex); 104565e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.device_list); 104665e7ae7bSOr Gerlitz mutex_init(&ig.connlist_mutex); 104765e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.connlist); 104865e7ae7bSOr Gerlitz 1049b73c3adaSAriel Nahum release_wq = alloc_workqueue("release workqueue", 0, 0); 1050b73c3adaSAriel Nahum if (!release_wq) { 1051b73c3adaSAriel Nahum iser_err("failed to allocate release workqueue\n"); 1052b73c3adaSAriel Nahum return -ENOMEM; 1053b73c3adaSAriel Nahum } 1054b73c3adaSAriel Nahum 105575613521SMike Christie iscsi_iser_scsi_transport = iscsi_register_transport( 105675613521SMike Christie &iscsi_iser_transport); 105775613521SMike Christie if (!iscsi_iser_scsi_transport) { 105865e7ae7bSOr Gerlitz iser_err("iscsi_register_transport failed\n"); 105965e7ae7bSOr Gerlitz err = -EINVAL; 106065e7ae7bSOr Gerlitz goto register_transport_failure; 106165e7ae7bSOr Gerlitz } 106265e7ae7bSOr Gerlitz 106365e7ae7bSOr Gerlitz return 0; 106465e7ae7bSOr Gerlitz 106565e7ae7bSOr Gerlitz register_transport_failure: 106665e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 106765e7ae7bSOr Gerlitz 106865e7ae7bSOr Gerlitz return err; 106965e7ae7bSOr Gerlitz } 107065e7ae7bSOr Gerlitz 107165e7ae7bSOr Gerlitz static void __exit iser_exit(void) 107265e7ae7bSOr Gerlitz { 10735716af6eSSagi Grimberg struct iser_conn *iser_conn, *n; 1074b73c3adaSAriel Nahum int connlist_empty; 1075b73c3adaSAriel Nahum 107665e7ae7bSOr Gerlitz iser_dbg("Removing iSER datamover...\n"); 1077b73c3adaSAriel Nahum destroy_workqueue(release_wq); 1078b73c3adaSAriel Nahum 1079b73c3adaSAriel Nahum mutex_lock(&ig.connlist_mutex); 1080b73c3adaSAriel Nahum connlist_empty = list_empty(&ig.connlist); 1081b73c3adaSAriel Nahum mutex_unlock(&ig.connlist_mutex); 1082b73c3adaSAriel Nahum 1083b73c3adaSAriel Nahum if (!connlist_empty) { 1084b73c3adaSAriel Nahum iser_err("Error cleanup stage completed but we still have iser " 1085b73c3adaSAriel Nahum "connections, destroying them anyway.\n"); 10865716af6eSSagi Grimberg list_for_each_entry_safe(iser_conn, n, &ig.connlist, 10875716af6eSSagi Grimberg conn_list) { 10885716af6eSSagi Grimberg iser_conn_release(iser_conn); 1089b73c3adaSAriel Nahum } 1090b73c3adaSAriel Nahum } 1091b73c3adaSAriel Nahum 109265e7ae7bSOr Gerlitz iscsi_unregister_transport(&iscsi_iser_transport); 109365e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 109465e7ae7bSOr Gerlitz } 109565e7ae7bSOr Gerlitz 109665e7ae7bSOr Gerlitz module_init(iser_init); 109765e7ae7bSOr Gerlitz module_exit(iser_exit); 1098