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 96df749cdcSSagi Grimberg unsigned int iser_max_sectors = ISER_DEF_MAX_SECTORS; 97df749cdcSSagi Grimberg module_param_named(max_sectors, iser_max_sectors, uint, S_IRUGO | S_IWUSR); 98df749cdcSSagi Grimberg MODULE_PARM_DESC(max_sectors, "Max number of sectors in a single scsi command (default:1024"); 99df749cdcSSagi Grimberg 1003cffd930SSagi Grimberg bool iser_always_reg = true; 1013cffd930SSagi Grimberg module_param_named(always_register, iser_always_reg, bool, S_IRUGO); 1023cffd930SSagi Grimberg MODULE_PARM_DESC(always_register, 1033cffd930SSagi Grimberg "Always register memory, even for continuous memory regions (default:true)"); 1043cffd930SSagi Grimberg 105db0a6cbdSJenny Falkovich bool iser_pi_enable = false; 106db0a6cbdSJenny Falkovich module_param_named(pi_enable, iser_pi_enable, bool, S_IRUGO); 107db0a6cbdSJenny Falkovich MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)"); 108db0a6cbdSJenny Falkovich 109db0a6cbdSJenny Falkovich int iser_pi_guard; 110db0a6cbdSJenny Falkovich module_param_named(pi_guard, iser_pi_guard, int, S_IRUGO); 111db0a6cbdSJenny Falkovich MODULE_PARM_DESC(pi_guard, "T10-PI guard_type [deprecated]"); 112db0a6cbdSJenny Falkovich 113dc05ac36SSagi Grimberg /* 11468a5e604SGeliang Tang * iscsi_iser_recv() - Process a successful recv completion 115dc05ac36SSagi Grimberg * @conn: iscsi connection 116dc05ac36SSagi Grimberg * @hdr: iscsi header 117dc05ac36SSagi Grimberg * @rx_data: buffer containing receive data payload 118dc05ac36SSagi Grimberg * @rx_data_len: length of rx_data 119dc05ac36SSagi Grimberg * 120dc05ac36SSagi Grimberg * Notes: In case of data length errors or iscsi PDU completion failures 121dc05ac36SSagi Grimberg * this routine will signal iscsi layer of connection failure. 122dc05ac36SSagi Grimberg */ 12365e7ae7bSOr Gerlitz void 124dc05ac36SSagi Grimberg iscsi_iser_recv(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 125dc05ac36SSagi Grimberg char *rx_data, int rx_data_len) 12665e7ae7bSOr Gerlitz { 12765e7ae7bSOr Gerlitz int rc = 0; 12865e7ae7bSOr Gerlitz int datalen; 12965e7ae7bSOr Gerlitz int ahslen; 13065e7ae7bSOr Gerlitz 13165e7ae7bSOr Gerlitz /* verify PDU length */ 13265e7ae7bSOr Gerlitz datalen = ntoh24(hdr->dlength); 133200ae1a0SOr Gerlitz if (datalen > rx_data_len || (datalen + 4) < rx_data_len) { 134200ae1a0SOr Gerlitz iser_err("wrong datalen %d (hdr), %d (IB)\n", 13565e7ae7bSOr Gerlitz datalen, rx_data_len); 13665e7ae7bSOr Gerlitz rc = ISCSI_ERR_DATALEN; 13765e7ae7bSOr Gerlitz goto error; 13865e7ae7bSOr Gerlitz } 13965e7ae7bSOr Gerlitz 140200ae1a0SOr Gerlitz if (datalen != rx_data_len) 141200ae1a0SOr Gerlitz iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", 142200ae1a0SOr Gerlitz datalen, rx_data_len); 143200ae1a0SOr Gerlitz 14465e7ae7bSOr Gerlitz /* read AHS */ 14565e7ae7bSOr Gerlitz ahslen = hdr->hlength * 4; 14665e7ae7bSOr Gerlitz 14765e7ae7bSOr Gerlitz rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 14865e7ae7bSOr Gerlitz if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 14965e7ae7bSOr Gerlitz goto error; 15065e7ae7bSOr Gerlitz 15165e7ae7bSOr Gerlitz return; 15265e7ae7bSOr Gerlitz error: 15365e7ae7bSOr Gerlitz iscsi_conn_failure(conn, rc); 15465e7ae7bSOr Gerlitz } 15565e7ae7bSOr Gerlitz 156dc05ac36SSagi Grimberg /** 157dc05ac36SSagi Grimberg * iscsi_iser_pdu_alloc() - allocate an iscsi-iser PDU 158dc05ac36SSagi Grimberg * @task: iscsi task 159dc05ac36SSagi Grimberg * @opcode: iscsi command opcode 160dc05ac36SSagi Grimberg * 161dc05ac36SSagi Grimberg * Netes: This routine can't fail, just assign iscsi task 162dc05ac36SSagi Grimberg * hdr and max hdr size. 163dc05ac36SSagi Grimberg */ 164dc05ac36SSagi Grimberg static int 165dc05ac36SSagi Grimberg iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) 1660f9c7449SMike Christie { 1670f9c7449SMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 1680f9c7449SMike Christie 1690f9c7449SMike Christie task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; 1700f9c7449SMike Christie task->hdr_max = sizeof(iser_task->desc.iscsi_header); 171dc05ac36SSagi Grimberg 1720f9c7449SMike Christie return 0; 1730f9c7449SMike Christie } 17465e7ae7bSOr Gerlitz 1757414dde0SSagi Grimberg /** 1767414dde0SSagi Grimberg * iser_initialize_task_headers() - Initialize task headers 1777414dde0SSagi Grimberg * @task: iscsi task 1787414dde0SSagi Grimberg * @tx_desc: iser tx descriptor 1797414dde0SSagi Grimberg * 1807414dde0SSagi Grimberg * Notes: 1817414dde0SSagi Grimberg * This routine may race with iser teardown flow for scsi 1827414dde0SSagi Grimberg * error handling TMFs. So for TMF we should acquire the 1837414dde0SSagi Grimberg * state mutex to avoid dereferencing the IB device which 1847414dde0SSagi Grimberg * may have already been terminated. 1857414dde0SSagi Grimberg */ 1867414dde0SSagi Grimberg int 1877414dde0SSagi Grimberg iser_initialize_task_headers(struct iscsi_task *task, 188f19624aaSOr Gerlitz struct iser_tx_desc *tx_desc) 189f19624aaSOr Gerlitz { 1905716af6eSSagi Grimberg struct iser_conn *iser_conn = task->conn->dd_data; 191a4ee3539SSagi Grimberg struct iser_device *device = iser_conn->ib_conn.device; 192f19624aaSOr Gerlitz struct iscsi_iser_task *iser_task = task->dd_data; 193f19624aaSOr Gerlitz u64 dma_addr; 1947414dde0SSagi Grimberg const bool mgmt_task = !task->sc && !in_interrupt(); 1957414dde0SSagi Grimberg int ret = 0; 1967414dde0SSagi Grimberg 1977414dde0SSagi Grimberg if (unlikely(mgmt_task)) 1987414dde0SSagi Grimberg mutex_lock(&iser_conn->state_mutex); 1997414dde0SSagi Grimberg 2007414dde0SSagi Grimberg if (unlikely(iser_conn->state != ISER_CONN_UP)) { 2017414dde0SSagi Grimberg ret = -ENODEV; 2027414dde0SSagi Grimberg goto out; 2037414dde0SSagi Grimberg } 204f19624aaSOr Gerlitz 205f19624aaSOr Gerlitz dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, 206f19624aaSOr Gerlitz ISER_HEADERS_LEN, DMA_TO_DEVICE); 2077414dde0SSagi Grimberg if (ib_dma_mapping_error(device->ib_device, dma_addr)) { 2087414dde0SSagi Grimberg ret = -ENOMEM; 2097414dde0SSagi Grimberg goto out; 2107414dde0SSagi Grimberg } 211f19624aaSOr Gerlitz 2127332bed0SSagi Grimberg tx_desc->wr_idx = 0; 2138d5944d8SSagi Grimberg tx_desc->mapped = true; 214f19624aaSOr Gerlitz tx_desc->dma_addr = dma_addr; 215f19624aaSOr Gerlitz tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 216f19624aaSOr Gerlitz tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 217256b7ad2SJason Gunthorpe tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey; 218f19624aaSOr Gerlitz 2195716af6eSSagi Grimberg iser_task->iser_conn = iser_conn; 2207414dde0SSagi Grimberg out: 2217414dde0SSagi Grimberg if (unlikely(mgmt_task)) 2227414dde0SSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 2237414dde0SSagi Grimberg 2247414dde0SSagi Grimberg return ret; 225f19624aaSOr Gerlitz } 226dc05ac36SSagi Grimberg 22765e7ae7bSOr Gerlitz /** 228dc05ac36SSagi Grimberg * iscsi_iser_task_init() - Initialize iscsi-iser task 2292261ec3dSMike Christie * @task: iscsi task 23065e7ae7bSOr Gerlitz * 2312261ec3dSMike Christie * Initialize the task for the scsi command or mgmt command. 232dc05ac36SSagi Grimberg * 233dc05ac36SSagi Grimberg * Return: Returns zero on success or -ENOMEM when failing 234dc05ac36SSagi Grimberg * to init task headers (dma mapping error). 2352747fdb2SMike Christie */ 236a8ac6311SOlaf Kirch static int 2372261ec3dSMike Christie iscsi_iser_task_init(struct iscsi_task *task) 23865e7ae7bSOr Gerlitz { 2392261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 2407414dde0SSagi Grimberg int ret; 24165e7ae7bSOr Gerlitz 2427414dde0SSagi Grimberg ret = iser_initialize_task_headers(task, &iser_task->desc); 2437414dde0SSagi Grimberg if (ret) { 2447414dde0SSagi Grimberg iser_err("Failed to init task %p, err = %d\n", 2457414dde0SSagi Grimberg iser_task, ret); 2467414dde0SSagi Grimberg return ret; 2477414dde0SSagi Grimberg } 248f19624aaSOr Gerlitz 2492261ec3dSMike Christie /* mgmt task */ 250f19624aaSOr Gerlitz if (!task->sc) 2512747fdb2SMike Christie return 0; 2522747fdb2SMike Christie 2532261ec3dSMike Christie iser_task->command_sent = 0; 2542261ec3dSMike Christie iser_task_rdma_init(iser_task); 255177e31bdSSagi Grimberg iser_task->sc = task->sc; 256177e31bdSSagi Grimberg 257a8ac6311SOlaf Kirch return 0; 25865e7ae7bSOr Gerlitz } 25965e7ae7bSOr Gerlitz 26065e7ae7bSOr Gerlitz /** 261dc05ac36SSagi Grimberg * iscsi_iser_mtask_xmit() - xmit management (immediate) task 26265e7ae7bSOr Gerlitz * @conn: iscsi connection 2632261ec3dSMike Christie * @task: task management task 26465e7ae7bSOr Gerlitz * 26565e7ae7bSOr Gerlitz * Notes: 26665e7ae7bSOr Gerlitz * The function can return -EAGAIN in which case caller must 26765e7ae7bSOr Gerlitz * call it again later, or recover. '0' return code means successful 26865e7ae7bSOr Gerlitz * xmit. 26965e7ae7bSOr Gerlitz * 27065e7ae7bSOr Gerlitz **/ 27165e7ae7bSOr Gerlitz static int 2722261ec3dSMike Christie iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 27365e7ae7bSOr Gerlitz { 27465e7ae7bSOr Gerlitz int error = 0; 27565e7ae7bSOr Gerlitz 276962b4b52SOr Gerlitz iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); 27765e7ae7bSOr Gerlitz 2782261ec3dSMike Christie error = iser_send_control(conn, task); 27965e7ae7bSOr Gerlitz 2802261ec3dSMike Christie /* since iser xmits control with zero copy, tasks can not be recycled 28165e7ae7bSOr Gerlitz * right after sending them. 28265e7ae7bSOr Gerlitz * The recycling scheme is based on whether a response is expected 2832261ec3dSMike Christie * - if yes, the task is recycled at iscsi_complete_pdu 2842261ec3dSMike Christie * - if no, the task is recycled at iser_snd_completion 28565e7ae7bSOr Gerlitz */ 28665e7ae7bSOr Gerlitz return error; 28765e7ae7bSOr Gerlitz } 28865e7ae7bSOr Gerlitz 28965e7ae7bSOr Gerlitz static int 2902747fdb2SMike Christie iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 2912261ec3dSMike Christie struct iscsi_task *task) 29265e7ae7bSOr Gerlitz { 2930f9c7449SMike Christie struct iscsi_r2t_info *r2t = &task->unsol_r2t; 29465e7ae7bSOr Gerlitz struct iscsi_data hdr; 29565e7ae7bSOr Gerlitz int error = 0; 29665e7ae7bSOr Gerlitz 29765e7ae7bSOr Gerlitz /* Send data-out PDUs while there's still unsolicited data to send */ 2980f9c7449SMike Christie while (iscsi_task_has_unsol_data(task)) { 2990f9c7449SMike Christie iscsi_prep_data_out_pdu(task, r2t, &hdr); 30048a237a2SMike Christie iser_dbg("Sending data-out: itt 0x%x, data count %d\n", 3010f9c7449SMike Christie hdr.itt, r2t->data_count); 30265e7ae7bSOr Gerlitz 30365e7ae7bSOr Gerlitz /* the buffer description has been passed with the command */ 30465e7ae7bSOr Gerlitz /* Send the command */ 3052261ec3dSMike Christie error = iser_send_data_out(conn, task, &hdr); 30665e7ae7bSOr Gerlitz if (error) { 3070f9c7449SMike Christie r2t->datasn--; 3082747fdb2SMike Christie goto iscsi_iser_task_xmit_unsol_data_exit; 30965e7ae7bSOr Gerlitz } 3100f9c7449SMike Christie r2t->sent += r2t->data_count; 31148a237a2SMike Christie iser_dbg("Need to send %d more as data-out PDUs\n", 3120f9c7449SMike Christie r2t->data_length - r2t->sent); 31365e7ae7bSOr Gerlitz } 31465e7ae7bSOr Gerlitz 3152747fdb2SMike Christie iscsi_iser_task_xmit_unsol_data_exit: 31665e7ae7bSOr Gerlitz return error; 31765e7ae7bSOr Gerlitz } 31865e7ae7bSOr Gerlitz 319dc05ac36SSagi Grimberg /** 320dc05ac36SSagi Grimberg * iscsi_iser_task_xmit() - xmit iscsi-iser task 321dc05ac36SSagi Grimberg * @task: iscsi task 322dc05ac36SSagi Grimberg * 323dc05ac36SSagi Grimberg * Return: zero on success or escalates $error on failure. 324dc05ac36SSagi Grimberg */ 32565e7ae7bSOr Gerlitz static int 3262261ec3dSMike Christie iscsi_iser_task_xmit(struct iscsi_task *task) 32765e7ae7bSOr Gerlitz { 3282261ec3dSMike Christie struct iscsi_conn *conn = task->conn; 3292261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 33065e7ae7bSOr Gerlitz int error = 0; 33165e7ae7bSOr Gerlitz 3322261ec3dSMike Christie if (!task->sc) 3332261ec3dSMike Christie return iscsi_iser_mtask_xmit(conn, task); 3342747fdb2SMike Christie 3352261ec3dSMike Christie if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 3362261ec3dSMike Christie BUG_ON(scsi_bufflen(task->sc) == 0); 33777a23c21SMike Christie 33848a237a2SMike Christie iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", 3392261ec3dSMike Christie task->itt, scsi_bufflen(task->sc), 3400f9c7449SMike Christie task->imm_count, task->unsol_r2t.data_length); 34177a23c21SMike Christie } 34277a23c21SMike Christie 343962b4b52SOr Gerlitz iser_dbg("ctask xmit [cid %d itt 0x%x]\n", 3442261ec3dSMike Christie conn->id, task->itt); 34565e7ae7bSOr Gerlitz 34665e7ae7bSOr Gerlitz /* Send the cmd PDU */ 3472261ec3dSMike Christie if (!iser_task->command_sent) { 3482261ec3dSMike Christie error = iser_send_command(conn, task); 34965e7ae7bSOr Gerlitz if (error) 3502747fdb2SMike Christie goto iscsi_iser_task_xmit_exit; 3512261ec3dSMike Christie iser_task->command_sent = 1; 35265e7ae7bSOr Gerlitz } 35365e7ae7bSOr Gerlitz 35465e7ae7bSOr Gerlitz /* Send unsolicited data-out PDU(s) if necessary */ 3550f9c7449SMike Christie if (iscsi_task_has_unsol_data(task)) 3562261ec3dSMike Christie error = iscsi_iser_task_xmit_unsol_data(conn, task); 35765e7ae7bSOr Gerlitz 3582747fdb2SMike Christie iscsi_iser_task_xmit_exit: 35965e7ae7bSOr Gerlitz return error; 36065e7ae7bSOr Gerlitz } 36165e7ae7bSOr Gerlitz 362dc05ac36SSagi Grimberg /** 363dc05ac36SSagi Grimberg * iscsi_iser_cleanup_task() - cleanup an iscsi-iser task 364dc05ac36SSagi Grimberg * @task: iscsi task 365dc05ac36SSagi Grimberg * 366dc05ac36SSagi Grimberg * Notes: In case the RDMA device is already NULL (might have 367dc05ac36SSagi Grimberg * been removed in DEVICE_REMOVAL CM event it will bail-out 368dc05ac36SSagi Grimberg * without doing dma unmapping. 369dc05ac36SSagi Grimberg */ 3700f9c7449SMike Christie static void iscsi_iser_cleanup_task(struct iscsi_task *task) 37165e7ae7bSOr Gerlitz { 3722261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 37352439540SOr Gerlitz struct iser_tx_desc *tx_desc = &iser_task->desc; 3745716af6eSSagi Grimberg struct iser_conn *iser_conn = task->conn->dd_data; 375a4ee3539SSagi Grimberg struct iser_device *device = iser_conn->ib_conn.device; 37652439540SOr Gerlitz 3773a940dafSSagi Grimberg /* DEVICE_REMOVAL event might have already released the device */ 3783a940dafSSagi Grimberg if (!device) 3793a940dafSSagi Grimberg return; 3803a940dafSSagi Grimberg 3818d5944d8SSagi Grimberg if (likely(tx_desc->mapped)) { 3828d5944d8SSagi Grimberg ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr, 3838d5944d8SSagi Grimberg ISER_HEADERS_LEN, DMA_TO_DEVICE); 3848d5944d8SSagi Grimberg tx_desc->mapped = false; 3858d5944d8SSagi Grimberg } 38665e7ae7bSOr Gerlitz 387b3cd5050SMike Christie /* mgmt tasks do not need special cleanup */ 388b3cd5050SMike Christie if (!task->sc) 3892747fdb2SMike Christie return; 39065e7ae7bSOr Gerlitz 3912261ec3dSMike Christie if (iser_task->status == ISER_TASK_STATUS_STARTED) { 3922261ec3dSMike Christie iser_task->status = ISER_TASK_STATUS_COMPLETED; 3932261ec3dSMike Christie iser_task_rdma_finalize(iser_task); 39465e7ae7bSOr Gerlitz } 39565e7ae7bSOr Gerlitz } 39665e7ae7bSOr Gerlitz 397dc05ac36SSagi Grimberg /** 398dc05ac36SSagi Grimberg * iscsi_iser_check_protection() - check protection information status of task. 399dc05ac36SSagi Grimberg * @task: iscsi task 400dc05ac36SSagi Grimberg * @sector: error sector if exsists (output) 401dc05ac36SSagi Grimberg * 402dc05ac36SSagi Grimberg * Return: zero if no data-integrity errors have occured 403dc05ac36SSagi Grimberg * 0x1: data-integrity error occured in the guard-block 404dc05ac36SSagi Grimberg * 0x2: data-integrity error occured in the reference tag 405dc05ac36SSagi Grimberg * 0x3: data-integrity error occured in the application tag 406dc05ac36SSagi Grimberg * 407dc05ac36SSagi Grimberg * In addition the error sector is marked. 408dc05ac36SSagi Grimberg */ 409dc05ac36SSagi Grimberg static u8 410dc05ac36SSagi Grimberg iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector) 4110a7a08adSSagi Grimberg { 4120a7a08adSSagi Grimberg struct iscsi_iser_task *iser_task = task->dd_data; 4130a7a08adSSagi Grimberg 4140a7a08adSSagi Grimberg if (iser_task->dir[ISER_DIR_IN]) 4150a7a08adSSagi Grimberg return iser_check_task_pi_status(iser_task, ISER_DIR_IN, 4160a7a08adSSagi Grimberg sector); 4170a7a08adSSagi Grimberg else 4180a7a08adSSagi Grimberg return iser_check_task_pi_status(iser_task, ISER_DIR_OUT, 4190a7a08adSSagi Grimberg sector); 4200a7a08adSSagi Grimberg } 4210a7a08adSSagi Grimberg 422dc05ac36SSagi Grimberg /** 423dc05ac36SSagi Grimberg * iscsi_iser_conn_create() - create a new iscsi-iser connection 424dc05ac36SSagi Grimberg * @cls_session: iscsi class connection 425dc05ac36SSagi Grimberg * @conn_idx: connection index within the session (for MCS) 426dc05ac36SSagi Grimberg * 427dc05ac36SSagi Grimberg * Return: iscsi_cls_conn when iscsi_conn_setup succeeds or NULL 428dc05ac36SSagi Grimberg * otherwise. 429dc05ac36SSagi Grimberg */ 43065e7ae7bSOr Gerlitz static struct iscsi_cls_conn * 431dc05ac36SSagi Grimberg iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, 432dc05ac36SSagi Grimberg uint32_t conn_idx) 43365e7ae7bSOr Gerlitz { 43465e7ae7bSOr Gerlitz struct iscsi_conn *conn; 43565e7ae7bSOr Gerlitz struct iscsi_cls_conn *cls_conn; 43665e7ae7bSOr Gerlitz 4374667f5dfSAriel Nahum cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx); 43865e7ae7bSOr Gerlitz if (!cls_conn) 43965e7ae7bSOr Gerlitz return NULL; 44065e7ae7bSOr Gerlitz conn = cls_conn->dd_data; 44165e7ae7bSOr Gerlitz 44265e7ae7bSOr Gerlitz /* 44365e7ae7bSOr Gerlitz * due to issues with the login code re iser sematics 44465e7ae7bSOr Gerlitz * this not set in iscsi_conn_setup - FIXME 44565e7ae7bSOr Gerlitz */ 446bcc60c38SOr Gerlitz conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; 44765e7ae7bSOr Gerlitz 44865e7ae7bSOr Gerlitz return cls_conn; 44965e7ae7bSOr Gerlitz } 45065e7ae7bSOr Gerlitz 451dc05ac36SSagi Grimberg /** 452dc05ac36SSagi Grimberg * iscsi_iser_conn_bind() - bind iscsi and iser connection structures 453dc05ac36SSagi Grimberg * @cls_session: iscsi class session 454dc05ac36SSagi Grimberg * @cls_conn: iscsi class connection 455dc05ac36SSagi Grimberg * @transport_eph: transport end-point handle 456dc05ac36SSagi Grimberg * @is_leading: indicate if this is the session leading connection (MCS) 457dc05ac36SSagi Grimberg * 458dc05ac36SSagi Grimberg * Return: zero on success, $error if iscsi_conn_bind fails and 459dc05ac36SSagi Grimberg * -EINVAL in case end-point doesn't exsits anymore or iser connection 460dc05ac36SSagi Grimberg * state is not UP (teardown already started). 461dc05ac36SSagi Grimberg */ 46265e7ae7bSOr Gerlitz static int 46365e7ae7bSOr Gerlitz iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 464dc05ac36SSagi Grimberg struct iscsi_cls_conn *cls_conn, 465dc05ac36SSagi Grimberg uint64_t transport_eph, 46665e7ae7bSOr Gerlitz int is_leading) 46765e7ae7bSOr Gerlitz { 46865e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 4695716af6eSSagi Grimberg struct iser_conn *iser_conn; 470412eeafaSMike Christie struct iscsi_endpoint *ep; 47165e7ae7bSOr Gerlitz int error; 47265e7ae7bSOr Gerlitz 47365e7ae7bSOr Gerlitz error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 47465e7ae7bSOr Gerlitz if (error) 47565e7ae7bSOr Gerlitz return error; 47665e7ae7bSOr Gerlitz 47765e7ae7bSOr Gerlitz /* the transport ep handle comes from user space so it must be 47865e7ae7bSOr Gerlitz * verified against the global ib connections list */ 479412eeafaSMike Christie ep = iscsi_lookup_endpoint(transport_eph); 480412eeafaSMike Christie if (!ep) { 48165e7ae7bSOr Gerlitz iser_err("can't bind eph %llx\n", 48265e7ae7bSOr Gerlitz (unsigned long long)transport_eph); 48365e7ae7bSOr Gerlitz return -EINVAL; 48465e7ae7bSOr Gerlitz } 4855716af6eSSagi Grimberg iser_conn = ep->dd_data; 486412eeafaSMike Christie 4875716af6eSSagi Grimberg mutex_lock(&iser_conn->state_mutex); 4885716af6eSSagi Grimberg if (iser_conn->state != ISER_CONN_UP) { 48991eb1df3SSagi Grimberg error = -EINVAL; 49091eb1df3SSagi Grimberg iser_err("iser_conn %p state is %d, teardown started\n", 4915716af6eSSagi Grimberg iser_conn, iser_conn->state); 49291eb1df3SSagi Grimberg goto out; 49391eb1df3SSagi Grimberg } 49491eb1df3SSagi Grimberg 4955716af6eSSagi Grimberg error = iser_alloc_rx_descriptors(iser_conn, conn->session); 49691eb1df3SSagi Grimberg if (error) 49791eb1df3SSagi Grimberg goto out; 49889e984e2SOr Gerlitz 49965e7ae7bSOr Gerlitz /* binds the iSER connection retrieved from the previously 50065e7ae7bSOr Gerlitz * connected ep_handle to the iSCSI layer connection. exchanges 50165e7ae7bSOr Gerlitz * connection pointers */ 5025716af6eSSagi Grimberg iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn); 5034667f5dfSAriel Nahum 5045716af6eSSagi Grimberg conn->dd_data = iser_conn; 5055716af6eSSagi Grimberg iser_conn->iscsi_conn = conn; 5064667f5dfSAriel Nahum 50791eb1df3SSagi Grimberg out: 5085716af6eSSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 50991eb1df3SSagi Grimberg return error; 51065e7ae7bSOr Gerlitz } 51165e7ae7bSOr Gerlitz 512dc05ac36SSagi Grimberg /** 513dc05ac36SSagi Grimberg * iscsi_iser_conn_start() - start iscsi-iser connection 514dc05ac36SSagi Grimberg * @cls_conn: iscsi class connection 515dc05ac36SSagi Grimberg * 516dc05ac36SSagi Grimberg * Notes: Here iser intialize (or re-initialize) stop_completion as 517dc05ac36SSagi Grimberg * from this point iscsi must call conn_stop in session/connection 518dc05ac36SSagi Grimberg * teardown so iser transport must wait for it. 519dc05ac36SSagi Grimberg */ 520b73c3adaSAriel Nahum static int 521b73c3adaSAriel Nahum iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 522b73c3adaSAriel Nahum { 523b73c3adaSAriel Nahum struct iscsi_conn *iscsi_conn; 5245716af6eSSagi Grimberg struct iser_conn *iser_conn; 525b73c3adaSAriel Nahum 526b73c3adaSAriel Nahum iscsi_conn = cls_conn->dd_data; 5275716af6eSSagi Grimberg iser_conn = iscsi_conn->dd_data; 5285716af6eSSagi Grimberg reinit_completion(&iser_conn->stop_completion); 529b73c3adaSAriel Nahum 530b73c3adaSAriel Nahum return iscsi_conn_start(cls_conn); 531b73c3adaSAriel Nahum } 532b73c3adaSAriel Nahum 533dc05ac36SSagi Grimberg /** 534dc05ac36SSagi Grimberg * iscsi_iser_conn_stop() - stop iscsi-iser connection 535dc05ac36SSagi Grimberg * @cls_conn: iscsi class connection 536dc05ac36SSagi Grimberg * @flag: indicate if recover or terminate (passed as is) 537dc05ac36SSagi Grimberg * 538dc05ac36SSagi Grimberg * Notes: Calling iscsi_conn_stop might theoretically race with 539dc05ac36SSagi Grimberg * DEVICE_REMOVAL event and dereference a previously freed RDMA device 540dc05ac36SSagi Grimberg * handle, so we call it under iser the state lock to protect against 541dc05ac36SSagi Grimberg * this kind of race. 542dc05ac36SSagi Grimberg */ 543b40977d9SMike Christie static void 544b40977d9SMike Christie iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 545b40977d9SMike Christie { 546b40977d9SMike Christie struct iscsi_conn *conn = cls_conn->dd_data; 5475716af6eSSagi Grimberg struct iser_conn *iser_conn = conn->dd_data; 548b40977d9SMike Christie 549bba0a3c9SAriel Nahum iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn); 550b73c3adaSAriel Nahum 551913e5bf4SMike Christie /* 552913e5bf4SMike Christie * Userspace may have goofed up and not bound the connection or 553913e5bf4SMike Christie * might have only partially setup the connection. 554913e5bf4SMike Christie */ 5555716af6eSSagi Grimberg if (iser_conn) { 556ec370e2bSAriel Nahum mutex_lock(&iser_conn->state_mutex); 557ec370e2bSAriel Nahum iser_conn_terminate(iser_conn); 558f0caef6dSSagi Grimberg iscsi_conn_stop(cls_conn, flag); 559ec370e2bSAriel Nahum 560ec370e2bSAriel Nahum /* unbind */ 561ec370e2bSAriel Nahum iser_conn->iscsi_conn = NULL; 5624667f5dfSAriel Nahum conn->dd_data = NULL; 563ec370e2bSAriel Nahum 5645716af6eSSagi Grimberg complete(&iser_conn->stop_completion); 565ec370e2bSAriel Nahum mutex_unlock(&iser_conn->state_mutex); 5663a940dafSSagi Grimberg } else { 5673a940dafSSagi Grimberg iscsi_conn_stop(cls_conn, flag); 568b73c3adaSAriel Nahum } 569b40977d9SMike Christie } 570b40977d9SMike Christie 571dc05ac36SSagi Grimberg /** 572dc05ac36SSagi Grimberg * iscsi_iser_session_destroy() - destroy iscsi-iser session 573dc05ac36SSagi Grimberg * @cls_session: iscsi class session 574dc05ac36SSagi Grimberg * 575dc05ac36SSagi Grimberg * Removes and free iscsi host. 576dc05ac36SSagi Grimberg */ 577dc05ac36SSagi Grimberg static void 578dc05ac36SSagi Grimberg iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 57975613521SMike Christie { 58075613521SMike Christie struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 58175613521SMike Christie 582e5bd7b54SMike Christie iscsi_session_teardown(cls_session); 583a4804cd6SMike Christie iscsi_host_remove(shost); 584a4804cd6SMike Christie iscsi_host_free(shost); 58575613521SMike Christie } 58665e7ae7bSOr Gerlitz 5876192d4e6SSagi Grimberg static inline unsigned int 5886192d4e6SSagi Grimberg iser_dif_prot_caps(int prot_caps) 5896192d4e6SSagi Grimberg { 5905bb6e543SSagi Grimberg return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? 5915bb6e543SSagi Grimberg SHOST_DIF_TYPE1_PROTECTION | SHOST_DIX_TYPE0_PROTECTION | 5926192d4e6SSagi Grimberg SHOST_DIX_TYPE1_PROTECTION : 0) | 5935bb6e543SSagi Grimberg ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? 5945bb6e543SSagi Grimberg SHOST_DIF_TYPE2_PROTECTION | SHOST_DIX_TYPE2_PROTECTION : 0) | 5955bb6e543SSagi Grimberg ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? 5965bb6e543SSagi Grimberg SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE3_PROTECTION : 0); 5976192d4e6SSagi Grimberg } 5986192d4e6SSagi Grimberg 599dc05ac36SSagi Grimberg /** 600dc05ac36SSagi Grimberg * iscsi_iser_session_create() - create an iscsi-iser session 601dc05ac36SSagi Grimberg * @ep: iscsi end-point handle 602dc05ac36SSagi Grimberg * @cmds_max: maximum commands in this session 603dc05ac36SSagi Grimberg * @qdepth: session command queue depth 604dc05ac36SSagi Grimberg * @initial_cmdsn: initiator command sequnce number 605dc05ac36SSagi Grimberg * 606dc05ac36SSagi Grimberg * Allocates and adds a scsi host, expose DIF supprot if 607dc05ac36SSagi Grimberg * exists, and sets up an iscsi session. 608dc05ac36SSagi Grimberg */ 60965e7ae7bSOr Gerlitz static struct iscsi_cls_session * 610412eeafaSMike Christie iscsi_iser_session_create(struct iscsi_endpoint *ep, 6111548271eSMike Christie uint16_t cmds_max, uint16_t qdepth, 6125e7facb7SMike Christie uint32_t initial_cmdsn) 61365e7ae7bSOr Gerlitz { 61465e7ae7bSOr Gerlitz struct iscsi_cls_session *cls_session; 61565e7ae7bSOr Gerlitz struct iscsi_session *session; 616412eeafaSMike Christie struct Scsi_Host *shost; 6175716af6eSSagi Grimberg struct iser_conn *iser_conn = NULL; 618a4ee3539SSagi Grimberg struct ib_conn *ib_conn; 619f4641ef7SMinh Tran u16 max_cmds; 62075613521SMike Christie 621962b4b52SOr Gerlitz shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); 62275613521SMike Christie if (!shost) 62375613521SMike Christie return NULL; 62475613521SMike Christie shost->transportt = iscsi_iser_scsi_transport; 625b7f04513SShlomo Pongratz shost->cmd_per_lun = qdepth; 62675613521SMike Christie shost->max_lun = iscsi_max_lun; 62775613521SMike Christie shost->max_id = 0; 62875613521SMike Christie shost->max_channel = 0; 62975613521SMike Christie shost->max_cmd_len = 16; 63075613521SMike Christie 631412eeafaSMike Christie /* 632412eeafaSMike Christie * older userspace tools (before 2.0-870) did not pass us 633412eeafaSMike Christie * the leading conn's ep so this will be NULL; 634412eeafaSMike Christie */ 6356192d4e6SSagi Grimberg if (ep) { 6365716af6eSSagi Grimberg iser_conn = ep->dd_data; 637f4641ef7SMinh Tran max_cmds = iser_conn->max_cmds; 638df749cdcSSagi Grimberg shost->sg_tablesize = iser_conn->scsi_sg_tablesize; 639df749cdcSSagi Grimberg shost->max_sectors = iser_conn->scsi_max_sectors; 6403f562a0bSAriel Nahum 6413f562a0bSAriel Nahum mutex_lock(&iser_conn->state_mutex); 6423f562a0bSAriel Nahum if (iser_conn->state != ISER_CONN_UP) { 6433f562a0bSAriel Nahum iser_err("iser conn %p already started teardown\n", 6443f562a0bSAriel Nahum iser_conn); 6453f562a0bSAriel Nahum mutex_unlock(&iser_conn->state_mutex); 6463f562a0bSAriel Nahum goto free_host; 6473f562a0bSAriel Nahum } 6483f562a0bSAriel Nahum 649a4ee3539SSagi Grimberg ib_conn = &iser_conn->ib_conn; 650a4ee3539SSagi Grimberg if (ib_conn->pi_support) { 651a4ee3539SSagi Grimberg u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap; 6526192d4e6SSagi Grimberg 6536192d4e6SSagi Grimberg scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps)); 6545bb6e543SSagi Grimberg scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP | 6555bb6e543SSagi Grimberg SHOST_DIX_GUARD_CRC); 6566192d4e6SSagi Grimberg } 6573f562a0bSAriel Nahum 6587854550aSSteve Wise /* 6597854550aSSteve Wise * Limit the sg_tablesize and max_sectors based on the device 6607854550aSSteve Wise * max fastreg page list length. 6617854550aSSteve Wise */ 6627854550aSSteve Wise shost->sg_tablesize = min_t(unsigned short, shost->sg_tablesize, 6637854550aSSteve Wise ib_conn->device->dev_attr.max_fast_reg_page_list_len); 6647854550aSSteve Wise shost->max_sectors = min_t(unsigned int, 6657854550aSSteve Wise 1024, (shost->sg_tablesize * PAGE_SIZE) >> 9); 6667854550aSSteve Wise 6673f562a0bSAriel Nahum if (iscsi_host_add(shost, 6683f562a0bSAriel Nahum ib_conn->device->ib_device->dma_device)) { 6693f562a0bSAriel Nahum mutex_unlock(&iser_conn->state_mutex); 6703f562a0bSAriel Nahum goto free_host; 6713f562a0bSAriel Nahum } 6723f562a0bSAriel Nahum mutex_unlock(&iser_conn->state_mutex); 673f4641ef7SMinh Tran } else { 674f4641ef7SMinh Tran max_cmds = ISER_DEF_XMIT_CMDS_MAX; 6753f562a0bSAriel Nahum if (iscsi_host_add(shost, NULL)) 67675613521SMike Christie goto free_host; 6773f562a0bSAriel Nahum } 67865e7ae7bSOr Gerlitz 679f4641ef7SMinh Tran if (cmds_max > max_cmds) { 680b7f04513SShlomo Pongratz iser_info("cmds_max changed from %u to %u\n", 681f4641ef7SMinh Tran cmds_max, max_cmds); 682f4641ef7SMinh Tran cmds_max = max_cmds; 683b7f04513SShlomo Pongratz } 684b7f04513SShlomo Pongratz 68575613521SMike Christie cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 686b7f04513SShlomo Pongratz cmds_max, 0, 6872261ec3dSMike Christie sizeof(struct iscsi_iser_task), 6887970634bSMike Christie initial_cmdsn, 0); 68965e7ae7bSOr Gerlitz if (!cls_session) 69075613521SMike Christie goto remove_host; 69175613521SMike Christie session = cls_session->dd_data; 69265e7ae7bSOr Gerlitz 6932747fdb2SMike Christie shost->can_queue = session->scsi_cmds_max; 69465e7ae7bSOr Gerlitz return cls_session; 69575613521SMike Christie 69675613521SMike Christie remove_host: 697a4804cd6SMike Christie iscsi_host_remove(shost); 69875613521SMike Christie free_host: 699a4804cd6SMike Christie iscsi_host_free(shost); 70075613521SMike Christie return NULL; 70165e7ae7bSOr Gerlitz } 70265e7ae7bSOr Gerlitz 70365e7ae7bSOr Gerlitz static int 704358ff019SMike Christie iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 705358ff019SMike Christie enum iscsi_param param, char *buf, int buflen) 70665e7ae7bSOr Gerlitz { 707358ff019SMike Christie int value; 70865e7ae7bSOr Gerlitz 70965e7ae7bSOr Gerlitz switch (param) { 71065e7ae7bSOr Gerlitz case ISCSI_PARAM_MAX_RECV_DLENGTH: 71165e7ae7bSOr Gerlitz /* TBD */ 71265e7ae7bSOr Gerlitz break; 71365e7ae7bSOr Gerlitz case ISCSI_PARAM_HDRDGST_EN: 714358ff019SMike Christie sscanf(buf, "%d", &value); 71565e7ae7bSOr Gerlitz if (value) { 716e7eeffa4SRoi Dayan iser_err("DataDigest wasn't negotiated to None\n"); 71765e7ae7bSOr Gerlitz return -EPROTO; 71865e7ae7bSOr Gerlitz } 71965e7ae7bSOr Gerlitz break; 72065e7ae7bSOr Gerlitz case ISCSI_PARAM_DATADGST_EN: 721358ff019SMike Christie sscanf(buf, "%d", &value); 72265e7ae7bSOr Gerlitz if (value) { 723e7eeffa4SRoi Dayan iser_err("DataDigest wasn't negotiated to None\n"); 72465e7ae7bSOr Gerlitz return -EPROTO; 72565e7ae7bSOr Gerlitz } 72665e7ae7bSOr Gerlitz break; 72765e7ae7bSOr Gerlitz case ISCSI_PARAM_IFMARKER_EN: 728358ff019SMike Christie sscanf(buf, "%d", &value); 72965e7ae7bSOr Gerlitz if (value) { 730e7eeffa4SRoi Dayan iser_err("IFMarker wasn't negotiated to No\n"); 73165e7ae7bSOr Gerlitz return -EPROTO; 73265e7ae7bSOr Gerlitz } 73365e7ae7bSOr Gerlitz break; 73465e7ae7bSOr Gerlitz case ISCSI_PARAM_OFMARKER_EN: 735358ff019SMike Christie sscanf(buf, "%d", &value); 73665e7ae7bSOr Gerlitz if (value) { 737e7eeffa4SRoi Dayan iser_err("OFMarker wasn't negotiated to No\n"); 73865e7ae7bSOr Gerlitz return -EPROTO; 73965e7ae7bSOr Gerlitz } 74065e7ae7bSOr Gerlitz break; 74165e7ae7bSOr Gerlitz default: 742358ff019SMike Christie return iscsi_set_param(cls_conn, param, buf, buflen); 74365e7ae7bSOr Gerlitz } 74465e7ae7bSOr Gerlitz 74565e7ae7bSOr Gerlitz return 0; 74665e7ae7bSOr Gerlitz } 74765e7ae7bSOr Gerlitz 748dc05ac36SSagi Grimberg /** 749dc05ac36SSagi Grimberg * iscsi_iser_set_param() - set class connection parameter 750dc05ac36SSagi Grimberg * @cls_conn: iscsi class connection 751dc05ac36SSagi Grimberg * @stats: iscsi stats to output 752dc05ac36SSagi Grimberg * 753dc05ac36SSagi Grimberg * Output connection statistics. 754dc05ac36SSagi Grimberg */ 75565e7ae7bSOr Gerlitz static void 75665e7ae7bSOr Gerlitz iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 75765e7ae7bSOr Gerlitz { 75865e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 75965e7ae7bSOr Gerlitz 76065e7ae7bSOr Gerlitz stats->txdata_octets = conn->txdata_octets; 76165e7ae7bSOr Gerlitz stats->rxdata_octets = conn->rxdata_octets; 76265e7ae7bSOr Gerlitz stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 76365e7ae7bSOr Gerlitz stats->dataout_pdus = conn->dataout_pdus_cnt; 76465e7ae7bSOr Gerlitz stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 76565e7ae7bSOr Gerlitz stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 76665e7ae7bSOr Gerlitz stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 76765e7ae7bSOr Gerlitz stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 76865e7ae7bSOr Gerlitz stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 76902816a8bSSagi Grimberg stats->custom_length = 1; 77002816a8bSSagi Grimberg strcpy(stats->custom[0].desc, "fmr_unalign_cnt"); 77102816a8bSSagi Grimberg stats->custom[0].value = conn->fmr_unalign_cnt; 77265e7ae7bSOr Gerlitz } 77365e7ae7bSOr Gerlitz 7747c53c6f8SMike Christie static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, 7757c53c6f8SMike Christie enum iscsi_param param, char *buf) 7767c53c6f8SMike Christie { 7775716af6eSSagi Grimberg struct iser_conn *iser_conn = ep->dd_data; 7787c53c6f8SMike Christie int len; 7797c53c6f8SMike Christie 7807c53c6f8SMike Christie switch (param) { 7817c53c6f8SMike Christie case ISCSI_PARAM_CONN_PORT: 7827c53c6f8SMike Christie case ISCSI_PARAM_CONN_ADDRESS: 783a4ee3539SSagi Grimberg if (!iser_conn || !iser_conn->ib_conn.cma_id) 7847c53c6f8SMike Christie return -ENOTCONN; 7857c53c6f8SMike Christie 7867c53c6f8SMike Christie return iscsi_conn_get_addr_param((struct sockaddr_storage *) 787a4ee3539SSagi Grimberg &iser_conn->ib_conn.cma_id->route.addr.dst_addr, 7887c53c6f8SMike Christie param, buf); 7897c53c6f8SMike Christie break; 7907c53c6f8SMike Christie default: 7917c53c6f8SMike Christie return -ENOSYS; 7927c53c6f8SMike Christie } 7937c53c6f8SMike Christie 7947c53c6f8SMike Christie return len; 7957c53c6f8SMike Christie } 7967c53c6f8SMike Christie 797dc05ac36SSagi Grimberg /** 798dc05ac36SSagi Grimberg * iscsi_iser_ep_connect() - Initiate iSER connection establishment 799dc05ac36SSagi Grimberg * @shost: scsi_host 800dc05ac36SSagi Grimberg * @dst_addr: destination address 801dc05ac36SSagi Grimberg * @non-blocking: indicate if routine can block 802dc05ac36SSagi Grimberg * 803dc05ac36SSagi Grimberg * Allocate an iscsi endpoint, an iser_conn structure and bind them. 804dc05ac36SSagi Grimberg * After that start RDMA connection establishment via rdma_cm. We 805dc05ac36SSagi Grimberg * don't allocate iser_conn embedded in iscsi_endpoint since in teardown 806dc05ac36SSagi Grimberg * the endpoint will be destroyed at ep_disconnect while iser_conn will 807dc05ac36SSagi Grimberg * cleanup its resources asynchronuously. 808dc05ac36SSagi Grimberg * 809dc05ac36SSagi Grimberg * Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error) 810dc05ac36SSagi Grimberg * if fails. 811dc05ac36SSagi Grimberg */ 812412eeafaSMike Christie static struct iscsi_endpoint * 81310eb0f01SMike Christie iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, 81410eb0f01SMike Christie int non_blocking) 81565e7ae7bSOr Gerlitz { 81665e7ae7bSOr Gerlitz int err; 8175716af6eSSagi Grimberg struct iser_conn *iser_conn; 818412eeafaSMike Christie struct iscsi_endpoint *ep; 81965e7ae7bSOr Gerlitz 8200a690758SAriel Nahum ep = iscsi_create_endpoint(0); 821412eeafaSMike Christie if (!ep) 822412eeafaSMike Christie return ERR_PTR(-ENOMEM); 82365e7ae7bSOr Gerlitz 8245716af6eSSagi Grimberg iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL); 8255716af6eSSagi Grimberg if (!iser_conn) { 8260a690758SAriel Nahum err = -ENOMEM; 8270a690758SAriel Nahum goto failure; 8280a690758SAriel Nahum } 8290a690758SAriel Nahum 8305716af6eSSagi Grimberg ep->dd_data = iser_conn; 8315716af6eSSagi Grimberg iser_conn->ep = ep; 8325716af6eSSagi Grimberg iser_conn_init(iser_conn); 83365e7ae7bSOr Gerlitz 8345716af6eSSagi Grimberg err = iser_connect(iser_conn, NULL, dst_addr, non_blocking); 8357d9c0de4SOr Gerlitz if (err) 8360a690758SAriel Nahum goto failure; 8377d9c0de4SOr Gerlitz 838412eeafaSMike Christie return ep; 8390a690758SAriel Nahum failure: 8400a690758SAriel Nahum iscsi_destroy_endpoint(ep); 8410a690758SAriel Nahum return ERR_PTR(err); 84265e7ae7bSOr Gerlitz } 84365e7ae7bSOr Gerlitz 844dc05ac36SSagi Grimberg /** 845dc05ac36SSagi Grimberg * iscsi_iser_ep_poll() - poll for iser connection establishment to complete 846dc05ac36SSagi Grimberg * @ep: iscsi endpoint (created at ep_connect) 847dc05ac36SSagi Grimberg * @timeout_ms: polling timeout allowed in ms. 848dc05ac36SSagi Grimberg * 849dc05ac36SSagi Grimberg * This routine boils down to waiting for up_completion signaling 850dc05ac36SSagi Grimberg * that cma_id got CONNECTED event. 851dc05ac36SSagi Grimberg * 852dc05ac36SSagi Grimberg * Return: 1 if succeeded in connection establishment, 0 if timeout expired 853dc05ac36SSagi Grimberg * (libiscsi will retry will kick in) or -1 if interrupted by signal 854dc05ac36SSagi Grimberg * or more likely iser connection state transitioned to TEMINATING or 855dc05ac36SSagi Grimberg * DOWN during the wait period. 856dc05ac36SSagi Grimberg */ 85765e7ae7bSOr Gerlitz static int 858412eeafaSMike Christie iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 85965e7ae7bSOr Gerlitz { 86074ce897bSSagi Grimberg struct iser_conn *iser_conn = ep->dd_data; 86165e7ae7bSOr Gerlitz int rc; 86265e7ae7bSOr Gerlitz 8635716af6eSSagi Grimberg rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion, 86465e7ae7bSOr Gerlitz msecs_to_jiffies(timeout_ms)); 86565e7ae7bSOr Gerlitz /* if conn establishment failed, return error code to iscsi */ 866504130c0SAriel Nahum if (rc == 0) { 8675716af6eSSagi Grimberg mutex_lock(&iser_conn->state_mutex); 8685716af6eSSagi Grimberg if (iser_conn->state == ISER_CONN_TERMINATING || 8695716af6eSSagi Grimberg iser_conn->state == ISER_CONN_DOWN) 87065e7ae7bSOr Gerlitz rc = -1; 8715716af6eSSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 872504130c0SAriel Nahum } 87365e7ae7bSOr Gerlitz 87474ce897bSSagi Grimberg iser_info("iser conn %p rc = %d\n", iser_conn, rc); 87565e7ae7bSOr Gerlitz 87665e7ae7bSOr Gerlitz if (rc > 0) 87765e7ae7bSOr Gerlitz return 1; /* success, this is the equivalent of POLLOUT */ 87865e7ae7bSOr Gerlitz else if (!rc) 87965e7ae7bSOr Gerlitz return 0; /* timeout */ 88065e7ae7bSOr Gerlitz else 88165e7ae7bSOr Gerlitz return rc; /* signal */ 88265e7ae7bSOr Gerlitz } 88365e7ae7bSOr Gerlitz 884dc05ac36SSagi Grimberg /** 885dc05ac36SSagi Grimberg * iscsi_iser_ep_disconnect() - Initiate connection teardown process 886dc05ac36SSagi Grimberg * @ep: iscsi endpoint handle 887dc05ac36SSagi Grimberg * 888dc05ac36SSagi Grimberg * This routine is not blocked by iser and RDMA termination process 889dc05ac36SSagi Grimberg * completion as we queue a deffered work for iser/RDMA destruction 890dc05ac36SSagi Grimberg * and cleanup or actually call it immediately in case we didn't pass 891dc05ac36SSagi Grimberg * iscsi conn bind/start stage, thus it is safe. 892dc05ac36SSagi Grimberg */ 89365e7ae7bSOr Gerlitz static void 894412eeafaSMike Christie iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 89565e7ae7bSOr Gerlitz { 89674ce897bSSagi Grimberg struct iser_conn *iser_conn = ep->dd_data; 89765e7ae7bSOr Gerlitz 89874ce897bSSagi Grimberg iser_info("ep %p iser conn %p\n", ep, iser_conn); 8995716af6eSSagi Grimberg 9005716af6eSSagi Grimberg mutex_lock(&iser_conn->state_mutex); 9015716af6eSSagi Grimberg iser_conn_terminate(iser_conn); 902b73c3adaSAriel Nahum 903b73c3adaSAriel Nahum /* 9049a6d3234SAriel Nahum * if iser_conn and iscsi_conn are bound, we must wait for 9059a6d3234SAriel Nahum * iscsi_conn_stop and flush errors completion before freeing 9069a6d3234SAriel Nahum * the iser resources. Otherwise we are safe to free resources 9079a6d3234SAriel Nahum * immediately. 908b73c3adaSAriel Nahum */ 9095716af6eSSagi Grimberg if (iser_conn->iscsi_conn) { 9105716af6eSSagi Grimberg INIT_WORK(&iser_conn->release_work, iser_release_work); 9115716af6eSSagi Grimberg queue_work(release_wq, &iser_conn->release_work); 9125716af6eSSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 913b73c3adaSAriel Nahum } else { 9145716af6eSSagi Grimberg iser_conn->state = ISER_CONN_DOWN; 9155716af6eSSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 9165716af6eSSagi Grimberg iser_conn_release(iser_conn); 917b73c3adaSAriel Nahum } 9181156cc80SSagi Grimberg 9190a690758SAriel Nahum iscsi_destroy_endpoint(ep); 92065e7ae7bSOr Gerlitz } 92165e7ae7bSOr Gerlitz 922587a1f16SAl Viro static umode_t iser_attr_is_visible(int param_type, int param) 9233128c6c7SMike Christie { 9243128c6c7SMike Christie switch (param_type) { 925f27fb2efSMike Christie case ISCSI_HOST_PARAM: 926f27fb2efSMike Christie switch (param) { 927f27fb2efSMike Christie case ISCSI_HOST_PARAM_NETDEV_NAME: 928f27fb2efSMike Christie case ISCSI_HOST_PARAM_HWADDRESS: 929f27fb2efSMike Christie case ISCSI_HOST_PARAM_INITIATOR_NAME: 930f27fb2efSMike Christie return S_IRUGO; 931f27fb2efSMike Christie default: 932f27fb2efSMike Christie return 0; 933f27fb2efSMike Christie } 9343128c6c7SMike Christie case ISCSI_PARAM: 9353128c6c7SMike Christie switch (param) { 9363128c6c7SMike Christie case ISCSI_PARAM_MAX_RECV_DLENGTH: 9373128c6c7SMike Christie case ISCSI_PARAM_MAX_XMIT_DLENGTH: 9383128c6c7SMike Christie case ISCSI_PARAM_HDRDGST_EN: 9393128c6c7SMike Christie case ISCSI_PARAM_DATADGST_EN: 9403128c6c7SMike Christie case ISCSI_PARAM_CONN_ADDRESS: 9413128c6c7SMike Christie case ISCSI_PARAM_CONN_PORT: 9423128c6c7SMike Christie case ISCSI_PARAM_EXP_STATSN: 9433128c6c7SMike Christie case ISCSI_PARAM_PERSISTENT_ADDRESS: 9443128c6c7SMike Christie case ISCSI_PARAM_PERSISTENT_PORT: 9453128c6c7SMike Christie case ISCSI_PARAM_PING_TMO: 9463128c6c7SMike Christie case ISCSI_PARAM_RECV_TMO: 9471d063c17SMike Christie case ISCSI_PARAM_INITIAL_R2T_EN: 9481d063c17SMike Christie case ISCSI_PARAM_MAX_R2T: 9491d063c17SMike Christie case ISCSI_PARAM_IMM_DATA_EN: 9501d063c17SMike Christie case ISCSI_PARAM_FIRST_BURST: 9511d063c17SMike Christie case ISCSI_PARAM_MAX_BURST: 9521d063c17SMike Christie case ISCSI_PARAM_PDU_INORDER_EN: 9531d063c17SMike Christie case ISCSI_PARAM_DATASEQ_INORDER_EN: 9541d063c17SMike Christie case ISCSI_PARAM_TARGET_NAME: 9551d063c17SMike Christie case ISCSI_PARAM_TPGT: 9561d063c17SMike Christie case ISCSI_PARAM_USERNAME: 9571d063c17SMike Christie case ISCSI_PARAM_PASSWORD: 9581d063c17SMike Christie case ISCSI_PARAM_USERNAME_IN: 9591d063c17SMike Christie case ISCSI_PARAM_PASSWORD_IN: 9601d063c17SMike Christie case ISCSI_PARAM_FAST_ABORT: 9611d063c17SMike Christie case ISCSI_PARAM_ABORT_TMO: 9621d063c17SMike Christie case ISCSI_PARAM_LU_RESET_TMO: 9631d063c17SMike Christie case ISCSI_PARAM_TGT_RESET_TMO: 9641d063c17SMike Christie case ISCSI_PARAM_IFACE_NAME: 9651d063c17SMike Christie case ISCSI_PARAM_INITIATOR_NAME: 9666a06a4b8SOr Gerlitz case ISCSI_PARAM_DISCOVERY_SESS: 9673128c6c7SMike Christie return S_IRUGO; 9683128c6c7SMike Christie default: 9693128c6c7SMike Christie return 0; 9703128c6c7SMike Christie } 9713128c6c7SMike Christie } 9723128c6c7SMike Christie 9733128c6c7SMike Christie return 0; 9743128c6c7SMike Christie } 9753128c6c7SMike Christie 97665e7ae7bSOr Gerlitz static struct scsi_host_template iscsi_iser_sht = { 9777974392cSMike Christie .module = THIS_MODULE, 978c1d786e6SRoi Dayan .name = "iSCSI Initiator over iSER", 97965e7ae7bSOr Gerlitz .queuecommand = iscsi_queuecommand, 980db5ed4dfSChristoph Hellwig .change_queue_depth = scsi_change_queue_depth, 981df749cdcSSagi Grimberg .sg_tablesize = ISCSI_ISER_DEF_SG_TABLESIZE, 982df749cdcSSagi Grimberg .max_sectors = ISER_DEF_MAX_SECTORS, 983e28f3d5bSMike Christie .cmd_per_lun = ISER_DEF_CMD_PER_LUN, 98465e7ae7bSOr Gerlitz .eh_abort_handler = iscsi_eh_abort, 98590c18f3cSErez Zilber .eh_device_reset_handler= iscsi_eh_device_reset, 986309ce156SJayamohan Kallickal .eh_target_reset_handler = iscsi_eh_recover_target, 9876b5d6c44SMike Christie .target_alloc = iscsi_target_alloc, 98865e7ae7bSOr Gerlitz .use_clustering = DISABLE_CLUSTERING, 98965e7ae7bSOr Gerlitz .proc_name = "iscsi_iser", 99065e7ae7bSOr Gerlitz .this_id = -1, 991c40ecc12SChristoph Hellwig .track_queue_depth = 1, 99265e7ae7bSOr Gerlitz }; 99365e7ae7bSOr Gerlitz 99465e7ae7bSOr Gerlitz static struct iscsi_transport iscsi_iser_transport = { 99565e7ae7bSOr Gerlitz .owner = THIS_MODULE, 99665e7ae7bSOr Gerlitz .name = "iser", 9976a06a4b8SOr Gerlitz .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO, 99865e7ae7bSOr Gerlitz /* session management */ 99965e7ae7bSOr Gerlitz .create_session = iscsi_iser_session_create, 100075613521SMike Christie .destroy_session = iscsi_iser_session_destroy, 100165e7ae7bSOr Gerlitz /* connection management */ 100265e7ae7bSOr Gerlitz .create_conn = iscsi_iser_conn_create, 100365e7ae7bSOr Gerlitz .bind_conn = iscsi_iser_conn_bind, 1004b73c3adaSAriel Nahum .destroy_conn = iscsi_conn_teardown, 10053128c6c7SMike Christie .attr_is_visible = iser_attr_is_visible, 1006358ff019SMike Christie .set_param = iscsi_iser_set_param, 1007358ff019SMike Christie .get_conn_param = iscsi_conn_get_param, 10087c53c6f8SMike Christie .get_ep_param = iscsi_iser_get_ep_param, 1009358ff019SMike Christie .get_session_param = iscsi_session_get_param, 1010b73c3adaSAriel Nahum .start_conn = iscsi_iser_conn_start, 1011b40977d9SMike Christie .stop_conn = iscsi_iser_conn_stop, 10120801c242SMike Christie /* iscsi host params */ 10130801c242SMike Christie .get_host_param = iscsi_host_get_param, 10140801c242SMike Christie .set_host_param = iscsi_host_set_param, 101565e7ae7bSOr Gerlitz /* IO */ 101665e7ae7bSOr Gerlitz .send_pdu = iscsi_conn_send_pdu, 101765e7ae7bSOr Gerlitz .get_stats = iscsi_iser_conn_get_stats, 10182747fdb2SMike Christie .init_task = iscsi_iser_task_init, 10192747fdb2SMike Christie .xmit_task = iscsi_iser_task_xmit, 10202747fdb2SMike Christie .cleanup_task = iscsi_iser_cleanup_task, 10210f9c7449SMike Christie .alloc_pdu = iscsi_iser_pdu_alloc, 10220a7a08adSSagi Grimberg .check_protection = iscsi_iser_check_protection, 102365e7ae7bSOr Gerlitz /* recovery */ 102465e7ae7bSOr Gerlitz .session_recovery_timedout = iscsi_session_recovery_timedout, 102565e7ae7bSOr Gerlitz 102665e7ae7bSOr Gerlitz .ep_connect = iscsi_iser_ep_connect, 102765e7ae7bSOr Gerlitz .ep_poll = iscsi_iser_ep_poll, 102865e7ae7bSOr Gerlitz .ep_disconnect = iscsi_iser_ep_disconnect 102965e7ae7bSOr Gerlitz }; 103065e7ae7bSOr Gerlitz 103165e7ae7bSOr Gerlitz static int __init iser_init(void) 103265e7ae7bSOr Gerlitz { 103365e7ae7bSOr Gerlitz int err; 103465e7ae7bSOr Gerlitz 103565e7ae7bSOr Gerlitz iser_dbg("Starting iSER datamover...\n"); 103665e7ae7bSOr Gerlitz 103765e7ae7bSOr Gerlitz if (iscsi_max_lun < 1) { 10384f363882SRoi Dayan iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); 103965e7ae7bSOr Gerlitz return -EINVAL; 104065e7ae7bSOr Gerlitz } 104165e7ae7bSOr Gerlitz 104265e7ae7bSOr Gerlitz memset(&ig, 0, sizeof(struct iser_global)); 104365e7ae7bSOr Gerlitz 104465e7ae7bSOr Gerlitz ig.desc_cache = kmem_cache_create("iser_descriptors", 1045f19624aaSOr Gerlitz sizeof(struct iser_tx_desc), 104665e7ae7bSOr Gerlitz 0, SLAB_HWCACHE_ALIGN, 104720c2df83SPaul Mundt NULL); 104865e7ae7bSOr Gerlitz if (ig.desc_cache == NULL) 104965e7ae7bSOr Gerlitz return -ENOMEM; 105065e7ae7bSOr Gerlitz 105165e7ae7bSOr Gerlitz /* device init is called only after the first addr resolution */ 105265e7ae7bSOr Gerlitz mutex_init(&ig.device_list_mutex); 105365e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.device_list); 105465e7ae7bSOr Gerlitz mutex_init(&ig.connlist_mutex); 105565e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.connlist); 105665e7ae7bSOr Gerlitz 1057b73c3adaSAriel Nahum release_wq = alloc_workqueue("release workqueue", 0, 0); 1058b73c3adaSAriel Nahum if (!release_wq) { 1059b73c3adaSAriel Nahum iser_err("failed to allocate release workqueue\n"); 1060b73c3adaSAriel Nahum return -ENOMEM; 1061b73c3adaSAriel Nahum } 1062b73c3adaSAriel Nahum 106375613521SMike Christie iscsi_iser_scsi_transport = iscsi_register_transport( 106475613521SMike Christie &iscsi_iser_transport); 106575613521SMike Christie if (!iscsi_iser_scsi_transport) { 106665e7ae7bSOr Gerlitz iser_err("iscsi_register_transport failed\n"); 106765e7ae7bSOr Gerlitz err = -EINVAL; 106865e7ae7bSOr Gerlitz goto register_transport_failure; 106965e7ae7bSOr Gerlitz } 107065e7ae7bSOr Gerlitz 107165e7ae7bSOr Gerlitz return 0; 107265e7ae7bSOr Gerlitz 107365e7ae7bSOr Gerlitz register_transport_failure: 107465e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 107565e7ae7bSOr Gerlitz 107665e7ae7bSOr Gerlitz return err; 107765e7ae7bSOr Gerlitz } 107865e7ae7bSOr Gerlitz 107965e7ae7bSOr Gerlitz static void __exit iser_exit(void) 108065e7ae7bSOr Gerlitz { 10815716af6eSSagi Grimberg struct iser_conn *iser_conn, *n; 1082b73c3adaSAriel Nahum int connlist_empty; 1083b73c3adaSAriel Nahum 108465e7ae7bSOr Gerlitz iser_dbg("Removing iSER datamover...\n"); 1085b73c3adaSAriel Nahum destroy_workqueue(release_wq); 1086b73c3adaSAriel Nahum 1087b73c3adaSAriel Nahum mutex_lock(&ig.connlist_mutex); 1088b73c3adaSAriel Nahum connlist_empty = list_empty(&ig.connlist); 1089b73c3adaSAriel Nahum mutex_unlock(&ig.connlist_mutex); 1090b73c3adaSAriel Nahum 1091b73c3adaSAriel Nahum if (!connlist_empty) { 1092b73c3adaSAriel Nahum iser_err("Error cleanup stage completed but we still have iser " 10931156cc80SSagi Grimberg "connections, destroying them anyway\n"); 10945716af6eSSagi Grimberg list_for_each_entry_safe(iser_conn, n, &ig.connlist, 10955716af6eSSagi Grimberg conn_list) { 10965716af6eSSagi Grimberg iser_conn_release(iser_conn); 1097b73c3adaSAriel Nahum } 1098b73c3adaSAriel Nahum } 1099b73c3adaSAriel Nahum 110065e7ae7bSOr Gerlitz iscsi_unregister_transport(&iscsi_iser_transport); 110165e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 110265e7ae7bSOr Gerlitz } 110365e7ae7bSOr Gerlitz 110465e7ae7bSOr Gerlitz module_init(iser_init); 110565e7ae7bSOr Gerlitz module_exit(iser_exit); 1106