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 7775613521SMike Christie static struct scsi_host_template iscsi_iser_sht; 7875613521SMike Christie static struct iscsi_transport iscsi_iser_transport; 7975613521SMike Christie static struct scsi_transport_template *iscsi_iser_scsi_transport; 8075613521SMike Christie 8165e7ae7bSOr Gerlitz static unsigned int iscsi_max_lun = 512; 8265e7ae7bSOr Gerlitz module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); 8365e7ae7bSOr Gerlitz 8465e7ae7bSOr Gerlitz int iser_debug_level = 0; 857f733847SAlex Tabachnik bool iser_pi_enable = false; 86f043032eSSagi Grimberg int iser_pi_guard = 1; 8765e7ae7bSOr Gerlitz 88c1d786e6SRoi Dayan MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover"); 8965e7ae7bSOr Gerlitz MODULE_LICENSE("Dual BSD/GPL"); 9065e7ae7bSOr Gerlitz MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); 91c1d786e6SRoi Dayan MODULE_VERSION(DRV_VER); 9265e7ae7bSOr Gerlitz 9365e7ae7bSOr Gerlitz module_param_named(debug_level, iser_debug_level, int, 0644); 9465e7ae7bSOr Gerlitz MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); 9565e7ae7bSOr Gerlitz 967f733847SAlex Tabachnik module_param_named(pi_enable, iser_pi_enable, bool, 0644); 977f733847SAlex Tabachnik MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)"); 987f733847SAlex Tabachnik 997f733847SAlex Tabachnik module_param_named(pi_guard, iser_pi_guard, int, 0644); 1005bb6e543SSagi Grimberg MODULE_PARM_DESC(pi_guard, "T10-PI guard_type [deprecated]"); 1017f733847SAlex Tabachnik 102b73c3adaSAriel Nahum static struct workqueue_struct *release_wq; 10365e7ae7bSOr Gerlitz struct iser_global ig; 10465e7ae7bSOr Gerlitz 105dc05ac36SSagi Grimberg /* 106dc05ac36SSagi Grimberg * iscsi_iser_recv() - Process a successfull recv completion 107dc05ac36SSagi Grimberg * @conn: iscsi connection 108dc05ac36SSagi Grimberg * @hdr: iscsi header 109dc05ac36SSagi Grimberg * @rx_data: buffer containing receive data payload 110dc05ac36SSagi Grimberg * @rx_data_len: length of rx_data 111dc05ac36SSagi Grimberg * 112dc05ac36SSagi Grimberg * Notes: In case of data length errors or iscsi PDU completion failures 113dc05ac36SSagi Grimberg * this routine will signal iscsi layer of connection failure. 114dc05ac36SSagi Grimberg */ 11565e7ae7bSOr Gerlitz void 116dc05ac36SSagi Grimberg iscsi_iser_recv(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 117dc05ac36SSagi Grimberg char *rx_data, int rx_data_len) 11865e7ae7bSOr Gerlitz { 11965e7ae7bSOr Gerlitz int rc = 0; 12065e7ae7bSOr Gerlitz int datalen; 12165e7ae7bSOr Gerlitz int ahslen; 12265e7ae7bSOr Gerlitz 12365e7ae7bSOr Gerlitz /* verify PDU length */ 12465e7ae7bSOr Gerlitz datalen = ntoh24(hdr->dlength); 125200ae1a0SOr Gerlitz if (datalen > rx_data_len || (datalen + 4) < rx_data_len) { 126200ae1a0SOr Gerlitz iser_err("wrong datalen %d (hdr), %d (IB)\n", 12765e7ae7bSOr Gerlitz datalen, rx_data_len); 12865e7ae7bSOr Gerlitz rc = ISCSI_ERR_DATALEN; 12965e7ae7bSOr Gerlitz goto error; 13065e7ae7bSOr Gerlitz } 13165e7ae7bSOr Gerlitz 132200ae1a0SOr Gerlitz if (datalen != rx_data_len) 133200ae1a0SOr Gerlitz iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", 134200ae1a0SOr Gerlitz datalen, rx_data_len); 135200ae1a0SOr Gerlitz 13665e7ae7bSOr Gerlitz /* read AHS */ 13765e7ae7bSOr Gerlitz ahslen = hdr->hlength * 4; 13865e7ae7bSOr Gerlitz 13965e7ae7bSOr Gerlitz rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 14065e7ae7bSOr Gerlitz if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 14165e7ae7bSOr Gerlitz goto error; 14265e7ae7bSOr Gerlitz 14365e7ae7bSOr Gerlitz return; 14465e7ae7bSOr Gerlitz error: 14565e7ae7bSOr Gerlitz iscsi_conn_failure(conn, rc); 14665e7ae7bSOr Gerlitz } 14765e7ae7bSOr Gerlitz 148dc05ac36SSagi Grimberg /** 149dc05ac36SSagi Grimberg * iscsi_iser_pdu_alloc() - allocate an iscsi-iser PDU 150dc05ac36SSagi Grimberg * @task: iscsi task 151dc05ac36SSagi Grimberg * @opcode: iscsi command opcode 152dc05ac36SSagi Grimberg * 153dc05ac36SSagi Grimberg * Netes: This routine can't fail, just assign iscsi task 154dc05ac36SSagi Grimberg * hdr and max hdr size. 155dc05ac36SSagi Grimberg */ 156dc05ac36SSagi Grimberg static int 157dc05ac36SSagi Grimberg iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) 1580f9c7449SMike Christie { 1590f9c7449SMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 1600f9c7449SMike Christie 1610f9c7449SMike Christie task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; 1620f9c7449SMike Christie task->hdr_max = sizeof(iser_task->desc.iscsi_header); 163dc05ac36SSagi Grimberg 1640f9c7449SMike Christie return 0; 1650f9c7449SMike Christie } 16665e7ae7bSOr Gerlitz 1677414dde0SSagi Grimberg /** 1687414dde0SSagi Grimberg * iser_initialize_task_headers() - Initialize task headers 1697414dde0SSagi Grimberg * @task: iscsi task 1707414dde0SSagi Grimberg * @tx_desc: iser tx descriptor 1717414dde0SSagi Grimberg * 1727414dde0SSagi Grimberg * Notes: 1737414dde0SSagi Grimberg * This routine may race with iser teardown flow for scsi 1747414dde0SSagi Grimberg * error handling TMFs. So for TMF we should acquire the 1757414dde0SSagi Grimberg * state mutex to avoid dereferencing the IB device which 1767414dde0SSagi Grimberg * may have already been terminated. 1777414dde0SSagi Grimberg */ 1787414dde0SSagi Grimberg int 1797414dde0SSagi Grimberg iser_initialize_task_headers(struct iscsi_task *task, 180f19624aaSOr Gerlitz struct iser_tx_desc *tx_desc) 181f19624aaSOr Gerlitz { 1825716af6eSSagi Grimberg struct iser_conn *iser_conn = task->conn->dd_data; 183a4ee3539SSagi Grimberg struct iser_device *device = iser_conn->ib_conn.device; 184f19624aaSOr Gerlitz struct iscsi_iser_task *iser_task = task->dd_data; 185f19624aaSOr Gerlitz u64 dma_addr; 1867414dde0SSagi Grimberg const bool mgmt_task = !task->sc && !in_interrupt(); 1877414dde0SSagi Grimberg int ret = 0; 1887414dde0SSagi Grimberg 1897414dde0SSagi Grimberg if (unlikely(mgmt_task)) 1907414dde0SSagi Grimberg mutex_lock(&iser_conn->state_mutex); 1917414dde0SSagi Grimberg 1927414dde0SSagi Grimberg if (unlikely(iser_conn->state != ISER_CONN_UP)) { 1937414dde0SSagi Grimberg ret = -ENODEV; 1947414dde0SSagi Grimberg goto out; 1957414dde0SSagi Grimberg } 196f19624aaSOr Gerlitz 197f19624aaSOr Gerlitz dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, 198f19624aaSOr Gerlitz ISER_HEADERS_LEN, DMA_TO_DEVICE); 1997414dde0SSagi Grimberg if (ib_dma_mapping_error(device->ib_device, dma_addr)) { 2007414dde0SSagi Grimberg ret = -ENOMEM; 2017414dde0SSagi Grimberg goto out; 2027414dde0SSagi Grimberg } 203f19624aaSOr Gerlitz 204f19624aaSOr Gerlitz tx_desc->dma_addr = dma_addr; 205f19624aaSOr Gerlitz tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 206f19624aaSOr Gerlitz tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 207f19624aaSOr Gerlitz tx_desc->tx_sg[0].lkey = device->mr->lkey; 208f19624aaSOr Gerlitz 2095716af6eSSagi Grimberg iser_task->iser_conn = iser_conn; 2107414dde0SSagi Grimberg out: 2117414dde0SSagi Grimberg if (unlikely(mgmt_task)) 2127414dde0SSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 2137414dde0SSagi Grimberg 2147414dde0SSagi Grimberg return ret; 215f19624aaSOr Gerlitz } 216dc05ac36SSagi Grimberg 21765e7ae7bSOr Gerlitz /** 218dc05ac36SSagi Grimberg * iscsi_iser_task_init() - Initialize iscsi-iser task 2192261ec3dSMike Christie * @task: iscsi task 22065e7ae7bSOr Gerlitz * 2212261ec3dSMike Christie * Initialize the task for the scsi command or mgmt command. 222dc05ac36SSagi Grimberg * 223dc05ac36SSagi Grimberg * Return: Returns zero on success or -ENOMEM when failing 224dc05ac36SSagi Grimberg * to init task headers (dma mapping error). 2252747fdb2SMike Christie */ 226a8ac6311SOlaf Kirch static int 2272261ec3dSMike Christie iscsi_iser_task_init(struct iscsi_task *task) 22865e7ae7bSOr Gerlitz { 2292261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 2307414dde0SSagi Grimberg int ret; 23165e7ae7bSOr Gerlitz 2327414dde0SSagi Grimberg ret = iser_initialize_task_headers(task, &iser_task->desc); 2337414dde0SSagi Grimberg if (ret) { 2347414dde0SSagi Grimberg iser_err("Failed to init task %p, err = %d\n", 2357414dde0SSagi Grimberg iser_task, ret); 2367414dde0SSagi Grimberg return ret; 2377414dde0SSagi Grimberg } 238f19624aaSOr Gerlitz 2392261ec3dSMike Christie /* mgmt task */ 240f19624aaSOr Gerlitz if (!task->sc) 2412747fdb2SMike Christie return 0; 2422747fdb2SMike Christie 2432261ec3dSMike Christie iser_task->command_sent = 0; 2442261ec3dSMike Christie iser_task_rdma_init(iser_task); 245177e31bdSSagi Grimberg iser_task->sc = task->sc; 246177e31bdSSagi Grimberg 247a8ac6311SOlaf Kirch return 0; 24865e7ae7bSOr Gerlitz } 24965e7ae7bSOr Gerlitz 25065e7ae7bSOr Gerlitz /** 251dc05ac36SSagi Grimberg * iscsi_iser_mtask_xmit() - xmit management (immediate) task 25265e7ae7bSOr Gerlitz * @conn: iscsi connection 2532261ec3dSMike Christie * @task: task management task 25465e7ae7bSOr Gerlitz * 25565e7ae7bSOr Gerlitz * Notes: 25665e7ae7bSOr Gerlitz * The function can return -EAGAIN in which case caller must 25765e7ae7bSOr Gerlitz * call it again later, or recover. '0' return code means successful 25865e7ae7bSOr Gerlitz * xmit. 25965e7ae7bSOr Gerlitz * 26065e7ae7bSOr Gerlitz **/ 26165e7ae7bSOr Gerlitz static int 2622261ec3dSMike Christie iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 26365e7ae7bSOr Gerlitz { 26465e7ae7bSOr Gerlitz int error = 0; 26565e7ae7bSOr Gerlitz 266962b4b52SOr Gerlitz iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); 26765e7ae7bSOr Gerlitz 2682261ec3dSMike Christie error = iser_send_control(conn, task); 26965e7ae7bSOr Gerlitz 2702261ec3dSMike Christie /* since iser xmits control with zero copy, tasks can not be recycled 27165e7ae7bSOr Gerlitz * right after sending them. 27265e7ae7bSOr Gerlitz * The recycling scheme is based on whether a response is expected 2732261ec3dSMike Christie * - if yes, the task is recycled at iscsi_complete_pdu 2742261ec3dSMike Christie * - if no, the task is recycled at iser_snd_completion 27565e7ae7bSOr Gerlitz */ 27665e7ae7bSOr Gerlitz return error; 27765e7ae7bSOr Gerlitz } 27865e7ae7bSOr Gerlitz 27965e7ae7bSOr Gerlitz static int 2802747fdb2SMike Christie iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 2812261ec3dSMike Christie struct iscsi_task *task) 28265e7ae7bSOr Gerlitz { 2830f9c7449SMike Christie struct iscsi_r2t_info *r2t = &task->unsol_r2t; 28465e7ae7bSOr Gerlitz struct iscsi_data hdr; 28565e7ae7bSOr Gerlitz int error = 0; 28665e7ae7bSOr Gerlitz 28765e7ae7bSOr Gerlitz /* Send data-out PDUs while there's still unsolicited data to send */ 2880f9c7449SMike Christie while (iscsi_task_has_unsol_data(task)) { 2890f9c7449SMike Christie iscsi_prep_data_out_pdu(task, r2t, &hdr); 29048a237a2SMike Christie iser_dbg("Sending data-out: itt 0x%x, data count %d\n", 2910f9c7449SMike Christie hdr.itt, r2t->data_count); 29265e7ae7bSOr Gerlitz 29365e7ae7bSOr Gerlitz /* the buffer description has been passed with the command */ 29465e7ae7bSOr Gerlitz /* Send the command */ 2952261ec3dSMike Christie error = iser_send_data_out(conn, task, &hdr); 29665e7ae7bSOr Gerlitz if (error) { 2970f9c7449SMike Christie r2t->datasn--; 2982747fdb2SMike Christie goto iscsi_iser_task_xmit_unsol_data_exit; 29965e7ae7bSOr Gerlitz } 3000f9c7449SMike Christie r2t->sent += r2t->data_count; 30148a237a2SMike Christie iser_dbg("Need to send %d more as data-out PDUs\n", 3020f9c7449SMike Christie r2t->data_length - r2t->sent); 30365e7ae7bSOr Gerlitz } 30465e7ae7bSOr Gerlitz 3052747fdb2SMike Christie iscsi_iser_task_xmit_unsol_data_exit: 30665e7ae7bSOr Gerlitz return error; 30765e7ae7bSOr Gerlitz } 30865e7ae7bSOr Gerlitz 309dc05ac36SSagi Grimberg /** 310dc05ac36SSagi Grimberg * iscsi_iser_task_xmit() - xmit iscsi-iser task 311dc05ac36SSagi Grimberg * @task: iscsi task 312dc05ac36SSagi Grimberg * 313dc05ac36SSagi Grimberg * Return: zero on success or escalates $error on failure. 314dc05ac36SSagi Grimberg */ 31565e7ae7bSOr Gerlitz static int 3162261ec3dSMike Christie iscsi_iser_task_xmit(struct iscsi_task *task) 31765e7ae7bSOr Gerlitz { 3182261ec3dSMike Christie struct iscsi_conn *conn = task->conn; 3192261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 32065e7ae7bSOr Gerlitz int error = 0; 32165e7ae7bSOr Gerlitz 3222261ec3dSMike Christie if (!task->sc) 3232261ec3dSMike Christie return iscsi_iser_mtask_xmit(conn, task); 3242747fdb2SMike Christie 3252261ec3dSMike Christie if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 3262261ec3dSMike Christie BUG_ON(scsi_bufflen(task->sc) == 0); 32777a23c21SMike Christie 32848a237a2SMike Christie iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", 3292261ec3dSMike Christie task->itt, scsi_bufflen(task->sc), 3300f9c7449SMike Christie task->imm_count, task->unsol_r2t.data_length); 33177a23c21SMike Christie } 33277a23c21SMike Christie 333962b4b52SOr Gerlitz iser_dbg("ctask xmit [cid %d itt 0x%x]\n", 3342261ec3dSMike Christie conn->id, task->itt); 33565e7ae7bSOr Gerlitz 33665e7ae7bSOr Gerlitz /* Send the cmd PDU */ 3372261ec3dSMike Christie if (!iser_task->command_sent) { 3382261ec3dSMike Christie error = iser_send_command(conn, task); 33965e7ae7bSOr Gerlitz if (error) 3402747fdb2SMike Christie goto iscsi_iser_task_xmit_exit; 3412261ec3dSMike Christie iser_task->command_sent = 1; 34265e7ae7bSOr Gerlitz } 34365e7ae7bSOr Gerlitz 34465e7ae7bSOr Gerlitz /* Send unsolicited data-out PDU(s) if necessary */ 3450f9c7449SMike Christie if (iscsi_task_has_unsol_data(task)) 3462261ec3dSMike Christie error = iscsi_iser_task_xmit_unsol_data(conn, task); 34765e7ae7bSOr Gerlitz 3482747fdb2SMike Christie iscsi_iser_task_xmit_exit: 34965e7ae7bSOr Gerlitz return error; 35065e7ae7bSOr Gerlitz } 35165e7ae7bSOr Gerlitz 352dc05ac36SSagi Grimberg /** 353dc05ac36SSagi Grimberg * iscsi_iser_cleanup_task() - cleanup an iscsi-iser task 354dc05ac36SSagi Grimberg * @task: iscsi task 355dc05ac36SSagi Grimberg * 356dc05ac36SSagi Grimberg * Notes: In case the RDMA device is already NULL (might have 357dc05ac36SSagi Grimberg * been removed in DEVICE_REMOVAL CM event it will bail-out 358dc05ac36SSagi Grimberg * without doing dma unmapping. 359dc05ac36SSagi Grimberg */ 3600f9c7449SMike Christie static void iscsi_iser_cleanup_task(struct iscsi_task *task) 36165e7ae7bSOr Gerlitz { 3622261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 36352439540SOr Gerlitz struct iser_tx_desc *tx_desc = &iser_task->desc; 3645716af6eSSagi Grimberg struct iser_conn *iser_conn = task->conn->dd_data; 365a4ee3539SSagi Grimberg struct iser_device *device = iser_conn->ib_conn.device; 36652439540SOr Gerlitz 3673a940dafSSagi Grimberg /* DEVICE_REMOVAL event might have already released the device */ 3683a940dafSSagi Grimberg if (!device) 3693a940dafSSagi Grimberg return; 3703a940dafSSagi Grimberg 37152439540SOr Gerlitz ib_dma_unmap_single(device->ib_device, 37252439540SOr Gerlitz tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 37365e7ae7bSOr Gerlitz 374b3cd5050SMike Christie /* mgmt tasks do not need special cleanup */ 375b3cd5050SMike Christie if (!task->sc) 3762747fdb2SMike Christie return; 37765e7ae7bSOr Gerlitz 3782261ec3dSMike Christie if (iser_task->status == ISER_TASK_STATUS_STARTED) { 3792261ec3dSMike Christie iser_task->status = ISER_TASK_STATUS_COMPLETED; 3802261ec3dSMike Christie iser_task_rdma_finalize(iser_task); 38165e7ae7bSOr Gerlitz } 38265e7ae7bSOr Gerlitz } 38365e7ae7bSOr Gerlitz 384dc05ac36SSagi Grimberg /** 385dc05ac36SSagi Grimberg * iscsi_iser_check_protection() - check protection information status of task. 386dc05ac36SSagi Grimberg * @task: iscsi task 387dc05ac36SSagi Grimberg * @sector: error sector if exsists (output) 388dc05ac36SSagi Grimberg * 389dc05ac36SSagi Grimberg * Return: zero if no data-integrity errors have occured 390dc05ac36SSagi Grimberg * 0x1: data-integrity error occured in the guard-block 391dc05ac36SSagi Grimberg * 0x2: data-integrity error occured in the reference tag 392dc05ac36SSagi Grimberg * 0x3: data-integrity error occured in the application tag 393dc05ac36SSagi Grimberg * 394dc05ac36SSagi Grimberg * In addition the error sector is marked. 395dc05ac36SSagi Grimberg */ 396dc05ac36SSagi Grimberg static u8 397dc05ac36SSagi Grimberg iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector) 3980a7a08adSSagi Grimberg { 3990a7a08adSSagi Grimberg struct iscsi_iser_task *iser_task = task->dd_data; 4000a7a08adSSagi Grimberg 4010a7a08adSSagi Grimberg if (iser_task->dir[ISER_DIR_IN]) 4020a7a08adSSagi Grimberg return iser_check_task_pi_status(iser_task, ISER_DIR_IN, 4030a7a08adSSagi Grimberg sector); 4040a7a08adSSagi Grimberg else 4050a7a08adSSagi Grimberg return iser_check_task_pi_status(iser_task, ISER_DIR_OUT, 4060a7a08adSSagi Grimberg sector); 4070a7a08adSSagi Grimberg } 4080a7a08adSSagi Grimberg 409dc05ac36SSagi Grimberg /** 410dc05ac36SSagi Grimberg * iscsi_iser_conn_create() - create a new iscsi-iser connection 411dc05ac36SSagi Grimberg * @cls_session: iscsi class connection 412dc05ac36SSagi Grimberg * @conn_idx: connection index within the session (for MCS) 413dc05ac36SSagi Grimberg * 414dc05ac36SSagi Grimberg * Return: iscsi_cls_conn when iscsi_conn_setup succeeds or NULL 415dc05ac36SSagi Grimberg * otherwise. 416dc05ac36SSagi Grimberg */ 41765e7ae7bSOr Gerlitz static struct iscsi_cls_conn * 418dc05ac36SSagi Grimberg iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, 419dc05ac36SSagi Grimberg uint32_t conn_idx) 42065e7ae7bSOr Gerlitz { 42165e7ae7bSOr Gerlitz struct iscsi_conn *conn; 42265e7ae7bSOr Gerlitz struct iscsi_cls_conn *cls_conn; 42365e7ae7bSOr Gerlitz 4244667f5dfSAriel Nahum cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx); 42565e7ae7bSOr Gerlitz if (!cls_conn) 42665e7ae7bSOr Gerlitz return NULL; 42765e7ae7bSOr Gerlitz conn = cls_conn->dd_data; 42865e7ae7bSOr Gerlitz 42965e7ae7bSOr Gerlitz /* 43065e7ae7bSOr Gerlitz * due to issues with the login code re iser sematics 43165e7ae7bSOr Gerlitz * this not set in iscsi_conn_setup - FIXME 43265e7ae7bSOr Gerlitz */ 433bcc60c38SOr Gerlitz conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; 43465e7ae7bSOr Gerlitz 43565e7ae7bSOr Gerlitz return cls_conn; 43665e7ae7bSOr Gerlitz } 43765e7ae7bSOr Gerlitz 438dc05ac36SSagi Grimberg /** 439dc05ac36SSagi Grimberg * iscsi_iser_conn_bind() - bind iscsi and iser connection structures 440dc05ac36SSagi Grimberg * @cls_session: iscsi class session 441dc05ac36SSagi Grimberg * @cls_conn: iscsi class connection 442dc05ac36SSagi Grimberg * @transport_eph: transport end-point handle 443dc05ac36SSagi Grimberg * @is_leading: indicate if this is the session leading connection (MCS) 444dc05ac36SSagi Grimberg * 445dc05ac36SSagi Grimberg * Return: zero on success, $error if iscsi_conn_bind fails and 446dc05ac36SSagi Grimberg * -EINVAL in case end-point doesn't exsits anymore or iser connection 447dc05ac36SSagi Grimberg * state is not UP (teardown already started). 448dc05ac36SSagi Grimberg */ 44965e7ae7bSOr Gerlitz static int 45065e7ae7bSOr Gerlitz iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 451dc05ac36SSagi Grimberg struct iscsi_cls_conn *cls_conn, 452dc05ac36SSagi Grimberg uint64_t transport_eph, 45365e7ae7bSOr Gerlitz int is_leading) 45465e7ae7bSOr Gerlitz { 45565e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 4565716af6eSSagi Grimberg struct iser_conn *iser_conn; 457412eeafaSMike Christie struct iscsi_endpoint *ep; 45865e7ae7bSOr Gerlitz int error; 45965e7ae7bSOr Gerlitz 46065e7ae7bSOr Gerlitz error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 46165e7ae7bSOr Gerlitz if (error) 46265e7ae7bSOr Gerlitz return error; 46365e7ae7bSOr Gerlitz 46465e7ae7bSOr Gerlitz /* the transport ep handle comes from user space so it must be 46565e7ae7bSOr Gerlitz * verified against the global ib connections list */ 466412eeafaSMike Christie ep = iscsi_lookup_endpoint(transport_eph); 467412eeafaSMike Christie if (!ep) { 46865e7ae7bSOr Gerlitz iser_err("can't bind eph %llx\n", 46965e7ae7bSOr Gerlitz (unsigned long long)transport_eph); 47065e7ae7bSOr Gerlitz return -EINVAL; 47165e7ae7bSOr Gerlitz } 4725716af6eSSagi Grimberg iser_conn = ep->dd_data; 473412eeafaSMike Christie 4745716af6eSSagi Grimberg mutex_lock(&iser_conn->state_mutex); 4755716af6eSSagi Grimberg if (iser_conn->state != ISER_CONN_UP) { 47691eb1df3SSagi Grimberg error = -EINVAL; 47791eb1df3SSagi Grimberg iser_err("iser_conn %p state is %d, teardown started\n", 4785716af6eSSagi Grimberg iser_conn, iser_conn->state); 47991eb1df3SSagi Grimberg goto out; 48091eb1df3SSagi Grimberg } 48191eb1df3SSagi Grimberg 4825716af6eSSagi Grimberg error = iser_alloc_rx_descriptors(iser_conn, conn->session); 48391eb1df3SSagi Grimberg if (error) 48491eb1df3SSagi Grimberg goto out; 48589e984e2SOr Gerlitz 48665e7ae7bSOr Gerlitz /* binds the iSER connection retrieved from the previously 48765e7ae7bSOr Gerlitz * connected ep_handle to the iSCSI layer connection. exchanges 48865e7ae7bSOr Gerlitz * connection pointers */ 4895716af6eSSagi Grimberg iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn); 4904667f5dfSAriel Nahum 4915716af6eSSagi Grimberg conn->dd_data = iser_conn; 4925716af6eSSagi Grimberg iser_conn->iscsi_conn = conn; 4934667f5dfSAriel Nahum 49491eb1df3SSagi Grimberg out: 4955716af6eSSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 49691eb1df3SSagi Grimberg return error; 49765e7ae7bSOr Gerlitz } 49865e7ae7bSOr Gerlitz 499dc05ac36SSagi Grimberg /** 500dc05ac36SSagi Grimberg * iscsi_iser_conn_start() - start iscsi-iser connection 501dc05ac36SSagi Grimberg * @cls_conn: iscsi class connection 502dc05ac36SSagi Grimberg * 503dc05ac36SSagi Grimberg * Notes: Here iser intialize (or re-initialize) stop_completion as 504dc05ac36SSagi Grimberg * from this point iscsi must call conn_stop in session/connection 505dc05ac36SSagi Grimberg * teardown so iser transport must wait for it. 506dc05ac36SSagi Grimberg */ 507b73c3adaSAriel Nahum static int 508b73c3adaSAriel Nahum iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 509b73c3adaSAriel Nahum { 510b73c3adaSAriel Nahum struct iscsi_conn *iscsi_conn; 5115716af6eSSagi Grimberg struct iser_conn *iser_conn; 512b73c3adaSAriel Nahum 513b73c3adaSAriel Nahum iscsi_conn = cls_conn->dd_data; 5145716af6eSSagi Grimberg iser_conn = iscsi_conn->dd_data; 5155716af6eSSagi Grimberg reinit_completion(&iser_conn->stop_completion); 516b73c3adaSAriel Nahum 517b73c3adaSAriel Nahum return iscsi_conn_start(cls_conn); 518b73c3adaSAriel Nahum } 519b73c3adaSAriel Nahum 520dc05ac36SSagi Grimberg /** 521dc05ac36SSagi Grimberg * iscsi_iser_conn_stop() - stop iscsi-iser connection 522dc05ac36SSagi Grimberg * @cls_conn: iscsi class connection 523dc05ac36SSagi Grimberg * @flag: indicate if recover or terminate (passed as is) 524dc05ac36SSagi Grimberg * 525dc05ac36SSagi Grimberg * Notes: Calling iscsi_conn_stop might theoretically race with 526dc05ac36SSagi Grimberg * DEVICE_REMOVAL event and dereference a previously freed RDMA device 527dc05ac36SSagi Grimberg * handle, so we call it under iser the state lock to protect against 528dc05ac36SSagi Grimberg * this kind of race. 529dc05ac36SSagi Grimberg */ 530b40977d9SMike Christie static void 531b40977d9SMike Christie iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 532b40977d9SMike Christie { 533b40977d9SMike Christie struct iscsi_conn *conn = cls_conn->dd_data; 5345716af6eSSagi Grimberg struct iser_conn *iser_conn = conn->dd_data; 535b40977d9SMike Christie 536bba0a3c9SAriel Nahum iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn); 537b73c3adaSAriel Nahum 538913e5bf4SMike Christie /* 539913e5bf4SMike Christie * Userspace may have goofed up and not bound the connection or 540913e5bf4SMike Christie * might have only partially setup the connection. 541913e5bf4SMike Christie */ 5425716af6eSSagi Grimberg if (iser_conn) { 543ec370e2bSAriel Nahum mutex_lock(&iser_conn->state_mutex); 544ec370e2bSAriel Nahum iser_conn_terminate(iser_conn); 545f0caef6dSSagi Grimberg iscsi_conn_stop(cls_conn, flag); 546ec370e2bSAriel Nahum 547ec370e2bSAriel Nahum /* unbind */ 548ec370e2bSAriel Nahum iser_conn->iscsi_conn = NULL; 5494667f5dfSAriel Nahum conn->dd_data = NULL; 550ec370e2bSAriel Nahum 5515716af6eSSagi Grimberg complete(&iser_conn->stop_completion); 552ec370e2bSAriel Nahum mutex_unlock(&iser_conn->state_mutex); 5533a940dafSSagi Grimberg } else { 5543a940dafSSagi Grimberg iscsi_conn_stop(cls_conn, flag); 555b73c3adaSAriel Nahum } 556b40977d9SMike Christie } 557b40977d9SMike Christie 558dc05ac36SSagi Grimberg /** 559dc05ac36SSagi Grimberg * iscsi_iser_session_destroy() - destroy iscsi-iser session 560dc05ac36SSagi Grimberg * @cls_session: iscsi class session 561dc05ac36SSagi Grimberg * 562dc05ac36SSagi Grimberg * Removes and free iscsi host. 563dc05ac36SSagi Grimberg */ 564dc05ac36SSagi Grimberg static void 565dc05ac36SSagi Grimberg iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 56675613521SMike Christie { 56775613521SMike Christie struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 56875613521SMike Christie 569e5bd7b54SMike Christie iscsi_session_teardown(cls_session); 570a4804cd6SMike Christie iscsi_host_remove(shost); 571a4804cd6SMike Christie iscsi_host_free(shost); 57275613521SMike Christie } 57365e7ae7bSOr Gerlitz 5746192d4e6SSagi Grimberg static inline unsigned int 5756192d4e6SSagi Grimberg iser_dif_prot_caps(int prot_caps) 5766192d4e6SSagi Grimberg { 5775bb6e543SSagi Grimberg return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? 5785bb6e543SSagi Grimberg SHOST_DIF_TYPE1_PROTECTION | SHOST_DIX_TYPE0_PROTECTION | 5796192d4e6SSagi Grimberg SHOST_DIX_TYPE1_PROTECTION : 0) | 5805bb6e543SSagi Grimberg ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? 5815bb6e543SSagi Grimberg SHOST_DIF_TYPE2_PROTECTION | SHOST_DIX_TYPE2_PROTECTION : 0) | 5825bb6e543SSagi Grimberg ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? 5835bb6e543SSagi Grimberg SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE3_PROTECTION : 0); 5846192d4e6SSagi Grimberg } 5856192d4e6SSagi Grimberg 586dc05ac36SSagi Grimberg /** 587dc05ac36SSagi Grimberg * iscsi_iser_session_create() - create an iscsi-iser session 588dc05ac36SSagi Grimberg * @ep: iscsi end-point handle 589dc05ac36SSagi Grimberg * @cmds_max: maximum commands in this session 590dc05ac36SSagi Grimberg * @qdepth: session command queue depth 591dc05ac36SSagi Grimberg * @initial_cmdsn: initiator command sequnce number 592dc05ac36SSagi Grimberg * 593dc05ac36SSagi Grimberg * Allocates and adds a scsi host, expose DIF supprot if 594dc05ac36SSagi Grimberg * exists, and sets up an iscsi session. 595dc05ac36SSagi Grimberg */ 59665e7ae7bSOr Gerlitz static struct iscsi_cls_session * 597412eeafaSMike Christie iscsi_iser_session_create(struct iscsi_endpoint *ep, 5981548271eSMike Christie uint16_t cmds_max, uint16_t qdepth, 5995e7facb7SMike Christie uint32_t initial_cmdsn) 60065e7ae7bSOr Gerlitz { 60165e7ae7bSOr Gerlitz struct iscsi_cls_session *cls_session; 60265e7ae7bSOr Gerlitz struct iscsi_session *session; 603412eeafaSMike Christie struct Scsi_Host *shost; 6045716af6eSSagi Grimberg struct iser_conn *iser_conn = NULL; 605a4ee3539SSagi Grimberg struct ib_conn *ib_conn; 606f4641ef7SMinh Tran u16 max_cmds; 60775613521SMike Christie 608962b4b52SOr Gerlitz shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); 60975613521SMike Christie if (!shost) 61075613521SMike Christie return NULL; 61175613521SMike Christie shost->transportt = iscsi_iser_scsi_transport; 612b7f04513SShlomo Pongratz shost->cmd_per_lun = qdepth; 61375613521SMike Christie shost->max_lun = iscsi_max_lun; 61475613521SMike Christie shost->max_id = 0; 61575613521SMike Christie shost->max_channel = 0; 61675613521SMike Christie shost->max_cmd_len = 16; 61775613521SMike Christie 618412eeafaSMike Christie /* 619412eeafaSMike Christie * older userspace tools (before 2.0-870) did not pass us 620412eeafaSMike Christie * the leading conn's ep so this will be NULL; 621412eeafaSMike Christie */ 6226192d4e6SSagi Grimberg if (ep) { 6235716af6eSSagi Grimberg iser_conn = ep->dd_data; 624f4641ef7SMinh Tran max_cmds = iser_conn->max_cmds; 6253f562a0bSAriel Nahum 6263f562a0bSAriel Nahum mutex_lock(&iser_conn->state_mutex); 6273f562a0bSAriel Nahum if (iser_conn->state != ISER_CONN_UP) { 6283f562a0bSAriel Nahum iser_err("iser conn %p already started teardown\n", 6293f562a0bSAriel Nahum iser_conn); 6303f562a0bSAriel Nahum mutex_unlock(&iser_conn->state_mutex); 6313f562a0bSAriel Nahum goto free_host; 6323f562a0bSAriel Nahum } 6333f562a0bSAriel Nahum 634a4ee3539SSagi Grimberg ib_conn = &iser_conn->ib_conn; 635a4ee3539SSagi Grimberg if (ib_conn->pi_support) { 636a4ee3539SSagi Grimberg u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap; 6376192d4e6SSagi Grimberg 6386192d4e6SSagi Grimberg scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps)); 6395bb6e543SSagi Grimberg scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP | 6405bb6e543SSagi Grimberg SHOST_DIX_GUARD_CRC); 6416192d4e6SSagi Grimberg } 6423f562a0bSAriel Nahum 6437854550aSSteve Wise /* 6447854550aSSteve Wise * Limit the sg_tablesize and max_sectors based on the device 6457854550aSSteve Wise * max fastreg page list length. 6467854550aSSteve Wise */ 6477854550aSSteve Wise shost->sg_tablesize = min_t(unsigned short, shost->sg_tablesize, 6487854550aSSteve Wise ib_conn->device->dev_attr.max_fast_reg_page_list_len); 6497854550aSSteve Wise shost->max_sectors = min_t(unsigned int, 6507854550aSSteve Wise 1024, (shost->sg_tablesize * PAGE_SIZE) >> 9); 6517854550aSSteve Wise 6523f562a0bSAriel Nahum if (iscsi_host_add(shost, 6533f562a0bSAriel Nahum ib_conn->device->ib_device->dma_device)) { 6543f562a0bSAriel Nahum mutex_unlock(&iser_conn->state_mutex); 6553f562a0bSAriel Nahum goto free_host; 6563f562a0bSAriel Nahum } 6573f562a0bSAriel Nahum mutex_unlock(&iser_conn->state_mutex); 658f4641ef7SMinh Tran } else { 659f4641ef7SMinh Tran max_cmds = ISER_DEF_XMIT_CMDS_MAX; 6603f562a0bSAriel Nahum if (iscsi_host_add(shost, NULL)) 66175613521SMike Christie goto free_host; 6623f562a0bSAriel Nahum } 66365e7ae7bSOr Gerlitz 664f4641ef7SMinh Tran if (cmds_max > max_cmds) { 665b7f04513SShlomo Pongratz iser_info("cmds_max changed from %u to %u\n", 666f4641ef7SMinh Tran cmds_max, max_cmds); 667f4641ef7SMinh Tran cmds_max = max_cmds; 668b7f04513SShlomo Pongratz } 669b7f04513SShlomo Pongratz 67075613521SMike Christie cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 671b7f04513SShlomo Pongratz cmds_max, 0, 6722261ec3dSMike Christie sizeof(struct iscsi_iser_task), 6737970634bSMike Christie initial_cmdsn, 0); 67465e7ae7bSOr Gerlitz if (!cls_session) 67575613521SMike Christie goto remove_host; 67675613521SMike Christie session = cls_session->dd_data; 67765e7ae7bSOr Gerlitz 6782747fdb2SMike Christie shost->can_queue = session->scsi_cmds_max; 67965e7ae7bSOr Gerlitz return cls_session; 68075613521SMike Christie 68175613521SMike Christie remove_host: 682a4804cd6SMike Christie iscsi_host_remove(shost); 68375613521SMike Christie free_host: 684a4804cd6SMike Christie iscsi_host_free(shost); 68575613521SMike Christie return NULL; 68665e7ae7bSOr Gerlitz } 68765e7ae7bSOr Gerlitz 68865e7ae7bSOr Gerlitz static int 689358ff019SMike Christie iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 690358ff019SMike Christie enum iscsi_param param, char *buf, int buflen) 69165e7ae7bSOr Gerlitz { 692358ff019SMike Christie int value; 69365e7ae7bSOr Gerlitz 69465e7ae7bSOr Gerlitz switch (param) { 69565e7ae7bSOr Gerlitz case ISCSI_PARAM_MAX_RECV_DLENGTH: 69665e7ae7bSOr Gerlitz /* TBD */ 69765e7ae7bSOr Gerlitz break; 69865e7ae7bSOr Gerlitz case ISCSI_PARAM_HDRDGST_EN: 699358ff019SMike Christie sscanf(buf, "%d", &value); 70065e7ae7bSOr Gerlitz if (value) { 701e7eeffa4SRoi Dayan iser_err("DataDigest wasn't negotiated to None\n"); 70265e7ae7bSOr Gerlitz return -EPROTO; 70365e7ae7bSOr Gerlitz } 70465e7ae7bSOr Gerlitz break; 70565e7ae7bSOr Gerlitz case ISCSI_PARAM_DATADGST_EN: 706358ff019SMike Christie sscanf(buf, "%d", &value); 70765e7ae7bSOr Gerlitz if (value) { 708e7eeffa4SRoi Dayan iser_err("DataDigest wasn't negotiated to None\n"); 70965e7ae7bSOr Gerlitz return -EPROTO; 71065e7ae7bSOr Gerlitz } 71165e7ae7bSOr Gerlitz break; 71265e7ae7bSOr Gerlitz case ISCSI_PARAM_IFMARKER_EN: 713358ff019SMike Christie sscanf(buf, "%d", &value); 71465e7ae7bSOr Gerlitz if (value) { 715e7eeffa4SRoi Dayan iser_err("IFMarker wasn't negotiated to No\n"); 71665e7ae7bSOr Gerlitz return -EPROTO; 71765e7ae7bSOr Gerlitz } 71865e7ae7bSOr Gerlitz break; 71965e7ae7bSOr Gerlitz case ISCSI_PARAM_OFMARKER_EN: 720358ff019SMike Christie sscanf(buf, "%d", &value); 72165e7ae7bSOr Gerlitz if (value) { 722e7eeffa4SRoi Dayan iser_err("OFMarker wasn't negotiated to No\n"); 72365e7ae7bSOr Gerlitz return -EPROTO; 72465e7ae7bSOr Gerlitz } 72565e7ae7bSOr Gerlitz break; 72665e7ae7bSOr Gerlitz default: 727358ff019SMike Christie return iscsi_set_param(cls_conn, param, buf, buflen); 72865e7ae7bSOr Gerlitz } 72965e7ae7bSOr Gerlitz 73065e7ae7bSOr Gerlitz return 0; 73165e7ae7bSOr Gerlitz } 73265e7ae7bSOr Gerlitz 733dc05ac36SSagi Grimberg /** 734dc05ac36SSagi Grimberg * iscsi_iser_set_param() - set class connection parameter 735dc05ac36SSagi Grimberg * @cls_conn: iscsi class connection 736dc05ac36SSagi Grimberg * @stats: iscsi stats to output 737dc05ac36SSagi Grimberg * 738dc05ac36SSagi Grimberg * Output connection statistics. 739dc05ac36SSagi Grimberg */ 74065e7ae7bSOr Gerlitz static void 74165e7ae7bSOr Gerlitz iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 74265e7ae7bSOr Gerlitz { 74365e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 74465e7ae7bSOr Gerlitz 74565e7ae7bSOr Gerlitz stats->txdata_octets = conn->txdata_octets; 74665e7ae7bSOr Gerlitz stats->rxdata_octets = conn->rxdata_octets; 74765e7ae7bSOr Gerlitz stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 74865e7ae7bSOr Gerlitz stats->dataout_pdus = conn->dataout_pdus_cnt; 74965e7ae7bSOr Gerlitz stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 75065e7ae7bSOr Gerlitz stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 75165e7ae7bSOr Gerlitz stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 75265e7ae7bSOr Gerlitz stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 75365e7ae7bSOr Gerlitz stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 75487528227SEli Dorfman stats->custom_length = 4; 75565e7ae7bSOr Gerlitz strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 75665e7ae7bSOr Gerlitz stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 75765e7ae7bSOr Gerlitz strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 75865e7ae7bSOr Gerlitz stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 75965e7ae7bSOr Gerlitz strcpy(stats->custom[2].desc, "eh_abort_cnt"); 76065e7ae7bSOr Gerlitz stats->custom[2].value = conn->eh_abort_cnt; 76187528227SEli Dorfman strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 76287528227SEli Dorfman stats->custom[3].value = conn->fmr_unalign_cnt; 76365e7ae7bSOr Gerlitz } 76465e7ae7bSOr Gerlitz 7657c53c6f8SMike Christie static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, 7667c53c6f8SMike Christie enum iscsi_param param, char *buf) 7677c53c6f8SMike Christie { 7685716af6eSSagi Grimberg struct iser_conn *iser_conn = ep->dd_data; 7697c53c6f8SMike Christie int len; 7707c53c6f8SMike Christie 7717c53c6f8SMike Christie switch (param) { 7727c53c6f8SMike Christie case ISCSI_PARAM_CONN_PORT: 7737c53c6f8SMike Christie case ISCSI_PARAM_CONN_ADDRESS: 774a4ee3539SSagi Grimberg if (!iser_conn || !iser_conn->ib_conn.cma_id) 7757c53c6f8SMike Christie return -ENOTCONN; 7767c53c6f8SMike Christie 7777c53c6f8SMike Christie return iscsi_conn_get_addr_param((struct sockaddr_storage *) 778a4ee3539SSagi Grimberg &iser_conn->ib_conn.cma_id->route.addr.dst_addr, 7797c53c6f8SMike Christie param, buf); 7807c53c6f8SMike Christie break; 7817c53c6f8SMike Christie default: 7827c53c6f8SMike Christie return -ENOSYS; 7837c53c6f8SMike Christie } 7847c53c6f8SMike Christie 7857c53c6f8SMike Christie return len; 7867c53c6f8SMike Christie } 7877c53c6f8SMike Christie 788dc05ac36SSagi Grimberg /** 789dc05ac36SSagi Grimberg * iscsi_iser_ep_connect() - Initiate iSER connection establishment 790dc05ac36SSagi Grimberg * @shost: scsi_host 791dc05ac36SSagi Grimberg * @dst_addr: destination address 792dc05ac36SSagi Grimberg * @non-blocking: indicate if routine can block 793dc05ac36SSagi Grimberg * 794dc05ac36SSagi Grimberg * Allocate an iscsi endpoint, an iser_conn structure and bind them. 795dc05ac36SSagi Grimberg * After that start RDMA connection establishment via rdma_cm. We 796dc05ac36SSagi Grimberg * don't allocate iser_conn embedded in iscsi_endpoint since in teardown 797dc05ac36SSagi Grimberg * the endpoint will be destroyed at ep_disconnect while iser_conn will 798dc05ac36SSagi Grimberg * cleanup its resources asynchronuously. 799dc05ac36SSagi Grimberg * 800dc05ac36SSagi Grimberg * Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error) 801dc05ac36SSagi Grimberg * if fails. 802dc05ac36SSagi Grimberg */ 803412eeafaSMike Christie static struct iscsi_endpoint * 80410eb0f01SMike Christie iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, 80510eb0f01SMike Christie int non_blocking) 80665e7ae7bSOr Gerlitz { 80765e7ae7bSOr Gerlitz int err; 8085716af6eSSagi Grimberg struct iser_conn *iser_conn; 809412eeafaSMike Christie struct iscsi_endpoint *ep; 81065e7ae7bSOr Gerlitz 8110a690758SAriel Nahum ep = iscsi_create_endpoint(0); 812412eeafaSMike Christie if (!ep) 813412eeafaSMike Christie return ERR_PTR(-ENOMEM); 81465e7ae7bSOr Gerlitz 8155716af6eSSagi Grimberg iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL); 8165716af6eSSagi Grimberg if (!iser_conn) { 8170a690758SAriel Nahum err = -ENOMEM; 8180a690758SAriel Nahum goto failure; 8190a690758SAriel Nahum } 8200a690758SAriel Nahum 8215716af6eSSagi Grimberg ep->dd_data = iser_conn; 8225716af6eSSagi Grimberg iser_conn->ep = ep; 8235716af6eSSagi Grimberg iser_conn_init(iser_conn); 82465e7ae7bSOr Gerlitz 8255716af6eSSagi Grimberg err = iser_connect(iser_conn, NULL, dst_addr, non_blocking); 8267d9c0de4SOr Gerlitz if (err) 8270a690758SAriel Nahum goto failure; 8287d9c0de4SOr Gerlitz 829412eeafaSMike Christie return ep; 8300a690758SAriel Nahum failure: 8310a690758SAriel Nahum iscsi_destroy_endpoint(ep); 8320a690758SAriel Nahum return ERR_PTR(err); 83365e7ae7bSOr Gerlitz } 83465e7ae7bSOr Gerlitz 835dc05ac36SSagi Grimberg /** 836dc05ac36SSagi Grimberg * iscsi_iser_ep_poll() - poll for iser connection establishment to complete 837dc05ac36SSagi Grimberg * @ep: iscsi endpoint (created at ep_connect) 838dc05ac36SSagi Grimberg * @timeout_ms: polling timeout allowed in ms. 839dc05ac36SSagi Grimberg * 840dc05ac36SSagi Grimberg * This routine boils down to waiting for up_completion signaling 841dc05ac36SSagi Grimberg * that cma_id got CONNECTED event. 842dc05ac36SSagi Grimberg * 843dc05ac36SSagi Grimberg * Return: 1 if succeeded in connection establishment, 0 if timeout expired 844dc05ac36SSagi Grimberg * (libiscsi will retry will kick in) or -1 if interrupted by signal 845dc05ac36SSagi Grimberg * or more likely iser connection state transitioned to TEMINATING or 846dc05ac36SSagi Grimberg * DOWN during the wait period. 847dc05ac36SSagi Grimberg */ 84865e7ae7bSOr Gerlitz static int 849412eeafaSMike Christie iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 85065e7ae7bSOr Gerlitz { 8515716af6eSSagi Grimberg struct iser_conn *iser_conn; 85265e7ae7bSOr Gerlitz int rc; 85365e7ae7bSOr Gerlitz 8545716af6eSSagi Grimberg iser_conn = ep->dd_data; 8555716af6eSSagi Grimberg rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion, 85665e7ae7bSOr Gerlitz msecs_to_jiffies(timeout_ms)); 85765e7ae7bSOr Gerlitz /* if conn establishment failed, return error code to iscsi */ 858504130c0SAriel Nahum if (rc == 0) { 8595716af6eSSagi Grimberg mutex_lock(&iser_conn->state_mutex); 8605716af6eSSagi Grimberg if (iser_conn->state == ISER_CONN_TERMINATING || 8615716af6eSSagi Grimberg iser_conn->state == ISER_CONN_DOWN) 86265e7ae7bSOr Gerlitz rc = -1; 8635716af6eSSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 864504130c0SAriel Nahum } 86565e7ae7bSOr Gerlitz 8665716af6eSSagi Grimberg iser_info("ib conn %p rc = %d\n", iser_conn, rc); 86765e7ae7bSOr Gerlitz 86865e7ae7bSOr Gerlitz if (rc > 0) 86965e7ae7bSOr Gerlitz return 1; /* success, this is the equivalent of POLLOUT */ 87065e7ae7bSOr Gerlitz else if (!rc) 87165e7ae7bSOr Gerlitz return 0; /* timeout */ 87265e7ae7bSOr Gerlitz else 87365e7ae7bSOr Gerlitz return rc; /* signal */ 87465e7ae7bSOr Gerlitz } 87565e7ae7bSOr Gerlitz 876dc05ac36SSagi Grimberg /** 877dc05ac36SSagi Grimberg * iscsi_iser_ep_disconnect() - Initiate connection teardown process 878dc05ac36SSagi Grimberg * @ep: iscsi endpoint handle 879dc05ac36SSagi Grimberg * 880dc05ac36SSagi Grimberg * This routine is not blocked by iser and RDMA termination process 881dc05ac36SSagi Grimberg * completion as we queue a deffered work for iser/RDMA destruction 882dc05ac36SSagi Grimberg * and cleanup or actually call it immediately in case we didn't pass 883dc05ac36SSagi Grimberg * iscsi conn bind/start stage, thus it is safe. 884dc05ac36SSagi Grimberg */ 88565e7ae7bSOr Gerlitz static void 886412eeafaSMike Christie iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 88765e7ae7bSOr Gerlitz { 8885716af6eSSagi Grimberg struct iser_conn *iser_conn; 88965e7ae7bSOr Gerlitz 8905716af6eSSagi Grimberg iser_conn = ep->dd_data; 8915716af6eSSagi Grimberg iser_info("ep %p iser conn %p state %d\n", 8925716af6eSSagi Grimberg ep, iser_conn, iser_conn->state); 8935716af6eSSagi Grimberg 8945716af6eSSagi Grimberg mutex_lock(&iser_conn->state_mutex); 8955716af6eSSagi Grimberg iser_conn_terminate(iser_conn); 896b73c3adaSAriel Nahum 897b73c3adaSAriel Nahum /* 8989a6d3234SAriel Nahum * if iser_conn and iscsi_conn are bound, we must wait for 8999a6d3234SAriel Nahum * iscsi_conn_stop and flush errors completion before freeing 9009a6d3234SAriel Nahum * the iser resources. Otherwise we are safe to free resources 9019a6d3234SAriel Nahum * immediately. 902b73c3adaSAriel Nahum */ 9035716af6eSSagi Grimberg if (iser_conn->iscsi_conn) { 9045716af6eSSagi Grimberg INIT_WORK(&iser_conn->release_work, iser_release_work); 9055716af6eSSagi Grimberg queue_work(release_wq, &iser_conn->release_work); 9065716af6eSSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 907b73c3adaSAriel Nahum } else { 9085716af6eSSagi Grimberg iser_conn->state = ISER_CONN_DOWN; 9095716af6eSSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 9105716af6eSSagi Grimberg iser_conn_release(iser_conn); 911b73c3adaSAriel Nahum } 9120a690758SAriel Nahum iscsi_destroy_endpoint(ep); 91365e7ae7bSOr Gerlitz } 91465e7ae7bSOr Gerlitz 915587a1f16SAl Viro static umode_t iser_attr_is_visible(int param_type, int param) 9163128c6c7SMike Christie { 9173128c6c7SMike Christie switch (param_type) { 918f27fb2efSMike Christie case ISCSI_HOST_PARAM: 919f27fb2efSMike Christie switch (param) { 920f27fb2efSMike Christie case ISCSI_HOST_PARAM_NETDEV_NAME: 921f27fb2efSMike Christie case ISCSI_HOST_PARAM_HWADDRESS: 922f27fb2efSMike Christie case ISCSI_HOST_PARAM_INITIATOR_NAME: 923f27fb2efSMike Christie return S_IRUGO; 924f27fb2efSMike Christie default: 925f27fb2efSMike Christie return 0; 926f27fb2efSMike Christie } 9273128c6c7SMike Christie case ISCSI_PARAM: 9283128c6c7SMike Christie switch (param) { 9293128c6c7SMike Christie case ISCSI_PARAM_MAX_RECV_DLENGTH: 9303128c6c7SMike Christie case ISCSI_PARAM_MAX_XMIT_DLENGTH: 9313128c6c7SMike Christie case ISCSI_PARAM_HDRDGST_EN: 9323128c6c7SMike Christie case ISCSI_PARAM_DATADGST_EN: 9333128c6c7SMike Christie case ISCSI_PARAM_CONN_ADDRESS: 9343128c6c7SMike Christie case ISCSI_PARAM_CONN_PORT: 9353128c6c7SMike Christie case ISCSI_PARAM_EXP_STATSN: 9363128c6c7SMike Christie case ISCSI_PARAM_PERSISTENT_ADDRESS: 9373128c6c7SMike Christie case ISCSI_PARAM_PERSISTENT_PORT: 9383128c6c7SMike Christie case ISCSI_PARAM_PING_TMO: 9393128c6c7SMike Christie case ISCSI_PARAM_RECV_TMO: 9401d063c17SMike Christie case ISCSI_PARAM_INITIAL_R2T_EN: 9411d063c17SMike Christie case ISCSI_PARAM_MAX_R2T: 9421d063c17SMike Christie case ISCSI_PARAM_IMM_DATA_EN: 9431d063c17SMike Christie case ISCSI_PARAM_FIRST_BURST: 9441d063c17SMike Christie case ISCSI_PARAM_MAX_BURST: 9451d063c17SMike Christie case ISCSI_PARAM_PDU_INORDER_EN: 9461d063c17SMike Christie case ISCSI_PARAM_DATASEQ_INORDER_EN: 9471d063c17SMike Christie case ISCSI_PARAM_TARGET_NAME: 9481d063c17SMike Christie case ISCSI_PARAM_TPGT: 9491d063c17SMike Christie case ISCSI_PARAM_USERNAME: 9501d063c17SMike Christie case ISCSI_PARAM_PASSWORD: 9511d063c17SMike Christie case ISCSI_PARAM_USERNAME_IN: 9521d063c17SMike Christie case ISCSI_PARAM_PASSWORD_IN: 9531d063c17SMike Christie case ISCSI_PARAM_FAST_ABORT: 9541d063c17SMike Christie case ISCSI_PARAM_ABORT_TMO: 9551d063c17SMike Christie case ISCSI_PARAM_LU_RESET_TMO: 9561d063c17SMike Christie case ISCSI_PARAM_TGT_RESET_TMO: 9571d063c17SMike Christie case ISCSI_PARAM_IFACE_NAME: 9581d063c17SMike Christie case ISCSI_PARAM_INITIATOR_NAME: 9596a06a4b8SOr Gerlitz case ISCSI_PARAM_DISCOVERY_SESS: 9603128c6c7SMike Christie return S_IRUGO; 9613128c6c7SMike Christie default: 9623128c6c7SMike Christie return 0; 9633128c6c7SMike Christie } 9643128c6c7SMike Christie } 9653128c6c7SMike Christie 9663128c6c7SMike Christie return 0; 9673128c6c7SMike Christie } 9683128c6c7SMike Christie 96965e7ae7bSOr Gerlitz static struct scsi_host_template iscsi_iser_sht = { 9707974392cSMike Christie .module = THIS_MODULE, 971c1d786e6SRoi Dayan .name = "iSCSI Initiator over iSER", 97265e7ae7bSOr Gerlitz .queuecommand = iscsi_queuecommand, 973db5ed4dfSChristoph Hellwig .change_queue_depth = scsi_change_queue_depth, 97465e7ae7bSOr Gerlitz .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 9758072ec2fSErez Zilber .max_sectors = 1024, 976e28f3d5bSMike Christie .cmd_per_lun = ISER_DEF_CMD_PER_LUN, 97765e7ae7bSOr Gerlitz .eh_abort_handler = iscsi_eh_abort, 97890c18f3cSErez Zilber .eh_device_reset_handler= iscsi_eh_device_reset, 979309ce156SJayamohan Kallickal .eh_target_reset_handler = iscsi_eh_recover_target, 9806b5d6c44SMike Christie .target_alloc = iscsi_target_alloc, 98165e7ae7bSOr Gerlitz .use_clustering = DISABLE_CLUSTERING, 98265e7ae7bSOr Gerlitz .proc_name = "iscsi_iser", 98365e7ae7bSOr Gerlitz .this_id = -1, 984c40ecc12SChristoph Hellwig .track_queue_depth = 1, 98565e7ae7bSOr Gerlitz }; 98665e7ae7bSOr Gerlitz 98765e7ae7bSOr Gerlitz static struct iscsi_transport iscsi_iser_transport = { 98865e7ae7bSOr Gerlitz .owner = THIS_MODULE, 98965e7ae7bSOr Gerlitz .name = "iser", 9906a06a4b8SOr Gerlitz .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO, 99165e7ae7bSOr Gerlitz /* session management */ 99265e7ae7bSOr Gerlitz .create_session = iscsi_iser_session_create, 99375613521SMike Christie .destroy_session = iscsi_iser_session_destroy, 99465e7ae7bSOr Gerlitz /* connection management */ 99565e7ae7bSOr Gerlitz .create_conn = iscsi_iser_conn_create, 99665e7ae7bSOr Gerlitz .bind_conn = iscsi_iser_conn_bind, 997b73c3adaSAriel Nahum .destroy_conn = iscsi_conn_teardown, 9983128c6c7SMike Christie .attr_is_visible = iser_attr_is_visible, 999358ff019SMike Christie .set_param = iscsi_iser_set_param, 1000358ff019SMike Christie .get_conn_param = iscsi_conn_get_param, 10017c53c6f8SMike Christie .get_ep_param = iscsi_iser_get_ep_param, 1002358ff019SMike Christie .get_session_param = iscsi_session_get_param, 1003b73c3adaSAriel Nahum .start_conn = iscsi_iser_conn_start, 1004b40977d9SMike Christie .stop_conn = iscsi_iser_conn_stop, 10050801c242SMike Christie /* iscsi host params */ 10060801c242SMike Christie .get_host_param = iscsi_host_get_param, 10070801c242SMike Christie .set_host_param = iscsi_host_set_param, 100865e7ae7bSOr Gerlitz /* IO */ 100965e7ae7bSOr Gerlitz .send_pdu = iscsi_conn_send_pdu, 101065e7ae7bSOr Gerlitz .get_stats = iscsi_iser_conn_get_stats, 10112747fdb2SMike Christie .init_task = iscsi_iser_task_init, 10122747fdb2SMike Christie .xmit_task = iscsi_iser_task_xmit, 10132747fdb2SMike Christie .cleanup_task = iscsi_iser_cleanup_task, 10140f9c7449SMike Christie .alloc_pdu = iscsi_iser_pdu_alloc, 10150a7a08adSSagi Grimberg .check_protection = iscsi_iser_check_protection, 101665e7ae7bSOr Gerlitz /* recovery */ 101765e7ae7bSOr Gerlitz .session_recovery_timedout = iscsi_session_recovery_timedout, 101865e7ae7bSOr Gerlitz 101965e7ae7bSOr Gerlitz .ep_connect = iscsi_iser_ep_connect, 102065e7ae7bSOr Gerlitz .ep_poll = iscsi_iser_ep_poll, 102165e7ae7bSOr Gerlitz .ep_disconnect = iscsi_iser_ep_disconnect 102265e7ae7bSOr Gerlitz }; 102365e7ae7bSOr Gerlitz 102465e7ae7bSOr Gerlitz static int __init iser_init(void) 102565e7ae7bSOr Gerlitz { 102665e7ae7bSOr Gerlitz int err; 102765e7ae7bSOr Gerlitz 102865e7ae7bSOr Gerlitz iser_dbg("Starting iSER datamover...\n"); 102965e7ae7bSOr Gerlitz 103065e7ae7bSOr Gerlitz if (iscsi_max_lun < 1) { 10314f363882SRoi Dayan iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); 103265e7ae7bSOr Gerlitz return -EINVAL; 103365e7ae7bSOr Gerlitz } 103465e7ae7bSOr Gerlitz 103565e7ae7bSOr Gerlitz memset(&ig, 0, sizeof(struct iser_global)); 103665e7ae7bSOr Gerlitz 103765e7ae7bSOr Gerlitz ig.desc_cache = kmem_cache_create("iser_descriptors", 1038f19624aaSOr Gerlitz sizeof(struct iser_tx_desc), 103965e7ae7bSOr Gerlitz 0, SLAB_HWCACHE_ALIGN, 104020c2df83SPaul Mundt NULL); 104165e7ae7bSOr Gerlitz if (ig.desc_cache == NULL) 104265e7ae7bSOr Gerlitz return -ENOMEM; 104365e7ae7bSOr Gerlitz 104465e7ae7bSOr Gerlitz /* device init is called only after the first addr resolution */ 104565e7ae7bSOr Gerlitz mutex_init(&ig.device_list_mutex); 104665e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.device_list); 104765e7ae7bSOr Gerlitz mutex_init(&ig.connlist_mutex); 104865e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.connlist); 104965e7ae7bSOr Gerlitz 1050b73c3adaSAriel Nahum release_wq = alloc_workqueue("release workqueue", 0, 0); 1051b73c3adaSAriel Nahum if (!release_wq) { 1052b73c3adaSAriel Nahum iser_err("failed to allocate release workqueue\n"); 1053b73c3adaSAriel Nahum return -ENOMEM; 1054b73c3adaSAriel Nahum } 1055b73c3adaSAriel Nahum 105675613521SMike Christie iscsi_iser_scsi_transport = iscsi_register_transport( 105775613521SMike Christie &iscsi_iser_transport); 105875613521SMike Christie if (!iscsi_iser_scsi_transport) { 105965e7ae7bSOr Gerlitz iser_err("iscsi_register_transport failed\n"); 106065e7ae7bSOr Gerlitz err = -EINVAL; 106165e7ae7bSOr Gerlitz goto register_transport_failure; 106265e7ae7bSOr Gerlitz } 106365e7ae7bSOr Gerlitz 106465e7ae7bSOr Gerlitz return 0; 106565e7ae7bSOr Gerlitz 106665e7ae7bSOr Gerlitz register_transport_failure: 106765e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 106865e7ae7bSOr Gerlitz 106965e7ae7bSOr Gerlitz return err; 107065e7ae7bSOr Gerlitz } 107165e7ae7bSOr Gerlitz 107265e7ae7bSOr Gerlitz static void __exit iser_exit(void) 107365e7ae7bSOr Gerlitz { 10745716af6eSSagi Grimberg struct iser_conn *iser_conn, *n; 1075b73c3adaSAriel Nahum int connlist_empty; 1076b73c3adaSAriel Nahum 107765e7ae7bSOr Gerlitz iser_dbg("Removing iSER datamover...\n"); 1078b73c3adaSAriel Nahum destroy_workqueue(release_wq); 1079b73c3adaSAriel Nahum 1080b73c3adaSAriel Nahum mutex_lock(&ig.connlist_mutex); 1081b73c3adaSAriel Nahum connlist_empty = list_empty(&ig.connlist); 1082b73c3adaSAriel Nahum mutex_unlock(&ig.connlist_mutex); 1083b73c3adaSAriel Nahum 1084b73c3adaSAriel Nahum if (!connlist_empty) { 1085b73c3adaSAriel Nahum iser_err("Error cleanup stage completed but we still have iser " 1086b73c3adaSAriel Nahum "connections, destroying them anyway.\n"); 10875716af6eSSagi Grimberg list_for_each_entry_safe(iser_conn, n, &ig.connlist, 10885716af6eSSagi Grimberg conn_list) { 10895716af6eSSagi Grimberg iser_conn_release(iser_conn); 1090b73c3adaSAriel Nahum } 1091b73c3adaSAriel Nahum } 1092b73c3adaSAriel Nahum 109365e7ae7bSOr Gerlitz iscsi_unregister_transport(&iscsi_iser_transport); 109465e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 109565e7ae7bSOr Gerlitz } 109665e7ae7bSOr Gerlitz 109765e7ae7bSOr Gerlitz module_init(iser_init); 109865e7ae7bSOr Gerlitz module_exit(iser_exit); 1099