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); 100f043032eSSagi Grimberg MODULE_PARM_DESC(pi_guard, "T10-PI guard_type, 0:CRC|1:IP_CSUM (default:IP_CSUM)"); 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 167f19624aaSOr Gerlitz int iser_initialize_task_headers(struct iscsi_task *task, 168f19624aaSOr Gerlitz struct iser_tx_desc *tx_desc) 169f19624aaSOr Gerlitz { 1705716af6eSSagi Grimberg struct iser_conn *iser_conn = task->conn->dd_data; 171a4ee3539SSagi Grimberg struct iser_device *device = iser_conn->ib_conn.device; 172f19624aaSOr Gerlitz struct iscsi_iser_task *iser_task = task->dd_data; 173f19624aaSOr Gerlitz u64 dma_addr; 174f19624aaSOr Gerlitz 175f19624aaSOr Gerlitz dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, 176f19624aaSOr Gerlitz ISER_HEADERS_LEN, DMA_TO_DEVICE); 177f19624aaSOr Gerlitz if (ib_dma_mapping_error(device->ib_device, dma_addr)) 178f19624aaSOr Gerlitz return -ENOMEM; 179f19624aaSOr Gerlitz 180f19624aaSOr Gerlitz tx_desc->dma_addr = dma_addr; 181f19624aaSOr Gerlitz tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 182f19624aaSOr Gerlitz tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 183f19624aaSOr Gerlitz tx_desc->tx_sg[0].lkey = device->mr->lkey; 184f19624aaSOr Gerlitz 1855716af6eSSagi Grimberg iser_task->iser_conn = iser_conn; 186f19624aaSOr Gerlitz return 0; 187f19624aaSOr Gerlitz } 188dc05ac36SSagi Grimberg 18965e7ae7bSOr Gerlitz /** 190dc05ac36SSagi Grimberg * iscsi_iser_task_init() - Initialize iscsi-iser task 1912261ec3dSMike Christie * @task: iscsi task 19265e7ae7bSOr Gerlitz * 1932261ec3dSMike Christie * Initialize the task for the scsi command or mgmt command. 194dc05ac36SSagi Grimberg * 195dc05ac36SSagi Grimberg * Return: Returns zero on success or -ENOMEM when failing 196dc05ac36SSagi Grimberg * to init task headers (dma mapping error). 1972747fdb2SMike Christie */ 198a8ac6311SOlaf Kirch static int 1992261ec3dSMike Christie iscsi_iser_task_init(struct iscsi_task *task) 20065e7ae7bSOr Gerlitz { 2012261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 20265e7ae7bSOr Gerlitz 203f19624aaSOr Gerlitz if (iser_initialize_task_headers(task, &iser_task->desc)) 204f19624aaSOr Gerlitz return -ENOMEM; 205f19624aaSOr Gerlitz 2062261ec3dSMike Christie /* mgmt task */ 207f19624aaSOr Gerlitz if (!task->sc) 2082747fdb2SMike Christie return 0; 2092747fdb2SMike Christie 2102261ec3dSMike Christie iser_task->command_sent = 0; 2112261ec3dSMike Christie iser_task_rdma_init(iser_task); 212177e31bdSSagi Grimberg iser_task->sc = task->sc; 213177e31bdSSagi Grimberg 214a8ac6311SOlaf Kirch return 0; 21565e7ae7bSOr Gerlitz } 21665e7ae7bSOr Gerlitz 21765e7ae7bSOr Gerlitz /** 218dc05ac36SSagi Grimberg * iscsi_iser_mtask_xmit() - xmit management (immediate) task 21965e7ae7bSOr Gerlitz * @conn: iscsi connection 2202261ec3dSMike Christie * @task: task management task 22165e7ae7bSOr Gerlitz * 22265e7ae7bSOr Gerlitz * Notes: 22365e7ae7bSOr Gerlitz * The function can return -EAGAIN in which case caller must 22465e7ae7bSOr Gerlitz * call it again later, or recover. '0' return code means successful 22565e7ae7bSOr Gerlitz * xmit. 22665e7ae7bSOr Gerlitz * 22765e7ae7bSOr Gerlitz **/ 22865e7ae7bSOr Gerlitz static int 2292261ec3dSMike Christie iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 23065e7ae7bSOr Gerlitz { 23165e7ae7bSOr Gerlitz int error = 0; 23265e7ae7bSOr Gerlitz 233962b4b52SOr Gerlitz iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); 23465e7ae7bSOr Gerlitz 2352261ec3dSMike Christie error = iser_send_control(conn, task); 23665e7ae7bSOr Gerlitz 2372261ec3dSMike Christie /* since iser xmits control with zero copy, tasks can not be recycled 23865e7ae7bSOr Gerlitz * right after sending them. 23965e7ae7bSOr Gerlitz * The recycling scheme is based on whether a response is expected 2402261ec3dSMike Christie * - if yes, the task is recycled at iscsi_complete_pdu 2412261ec3dSMike Christie * - if no, the task is recycled at iser_snd_completion 24265e7ae7bSOr Gerlitz */ 24365e7ae7bSOr Gerlitz return error; 24465e7ae7bSOr Gerlitz } 24565e7ae7bSOr Gerlitz 24665e7ae7bSOr Gerlitz static int 2472747fdb2SMike Christie iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 2482261ec3dSMike Christie struct iscsi_task *task) 24965e7ae7bSOr Gerlitz { 2500f9c7449SMike Christie struct iscsi_r2t_info *r2t = &task->unsol_r2t; 25165e7ae7bSOr Gerlitz struct iscsi_data hdr; 25265e7ae7bSOr Gerlitz int error = 0; 25365e7ae7bSOr Gerlitz 25465e7ae7bSOr Gerlitz /* Send data-out PDUs while there's still unsolicited data to send */ 2550f9c7449SMike Christie while (iscsi_task_has_unsol_data(task)) { 2560f9c7449SMike Christie iscsi_prep_data_out_pdu(task, r2t, &hdr); 25748a237a2SMike Christie iser_dbg("Sending data-out: itt 0x%x, data count %d\n", 2580f9c7449SMike Christie hdr.itt, r2t->data_count); 25965e7ae7bSOr Gerlitz 26065e7ae7bSOr Gerlitz /* the buffer description has been passed with the command */ 26165e7ae7bSOr Gerlitz /* Send the command */ 2622261ec3dSMike Christie error = iser_send_data_out(conn, task, &hdr); 26365e7ae7bSOr Gerlitz if (error) { 2640f9c7449SMike Christie r2t->datasn--; 2652747fdb2SMike Christie goto iscsi_iser_task_xmit_unsol_data_exit; 26665e7ae7bSOr Gerlitz } 2670f9c7449SMike Christie r2t->sent += r2t->data_count; 26848a237a2SMike Christie iser_dbg("Need to send %d more as data-out PDUs\n", 2690f9c7449SMike Christie r2t->data_length - r2t->sent); 27065e7ae7bSOr Gerlitz } 27165e7ae7bSOr Gerlitz 2722747fdb2SMike Christie iscsi_iser_task_xmit_unsol_data_exit: 27365e7ae7bSOr Gerlitz return error; 27465e7ae7bSOr Gerlitz } 27565e7ae7bSOr Gerlitz 276dc05ac36SSagi Grimberg /** 277dc05ac36SSagi Grimberg * iscsi_iser_task_xmit() - xmit iscsi-iser task 278dc05ac36SSagi Grimberg * @task: iscsi task 279dc05ac36SSagi Grimberg * 280dc05ac36SSagi Grimberg * Return: zero on success or escalates $error on failure. 281dc05ac36SSagi Grimberg */ 28265e7ae7bSOr Gerlitz static int 2832261ec3dSMike Christie iscsi_iser_task_xmit(struct iscsi_task *task) 28465e7ae7bSOr Gerlitz { 2852261ec3dSMike Christie struct iscsi_conn *conn = task->conn; 2862261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 28765e7ae7bSOr Gerlitz int error = 0; 28865e7ae7bSOr Gerlitz 2892261ec3dSMike Christie if (!task->sc) 2902261ec3dSMike Christie return iscsi_iser_mtask_xmit(conn, task); 2912747fdb2SMike Christie 2922261ec3dSMike Christie if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 2932261ec3dSMike Christie BUG_ON(scsi_bufflen(task->sc) == 0); 29477a23c21SMike Christie 29548a237a2SMike Christie iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", 2962261ec3dSMike Christie task->itt, scsi_bufflen(task->sc), 2970f9c7449SMike Christie task->imm_count, task->unsol_r2t.data_length); 29877a23c21SMike Christie } 29977a23c21SMike Christie 300962b4b52SOr Gerlitz iser_dbg("ctask xmit [cid %d itt 0x%x]\n", 3012261ec3dSMike Christie conn->id, task->itt); 30265e7ae7bSOr Gerlitz 30365e7ae7bSOr Gerlitz /* Send the cmd PDU */ 3042261ec3dSMike Christie if (!iser_task->command_sent) { 3052261ec3dSMike Christie error = iser_send_command(conn, task); 30665e7ae7bSOr Gerlitz if (error) 3072747fdb2SMike Christie goto iscsi_iser_task_xmit_exit; 3082261ec3dSMike Christie iser_task->command_sent = 1; 30965e7ae7bSOr Gerlitz } 31065e7ae7bSOr Gerlitz 31165e7ae7bSOr Gerlitz /* Send unsolicited data-out PDU(s) if necessary */ 3120f9c7449SMike Christie if (iscsi_task_has_unsol_data(task)) 3132261ec3dSMike Christie error = iscsi_iser_task_xmit_unsol_data(conn, task); 31465e7ae7bSOr Gerlitz 3152747fdb2SMike Christie iscsi_iser_task_xmit_exit: 31665e7ae7bSOr Gerlitz return error; 31765e7ae7bSOr Gerlitz } 31865e7ae7bSOr Gerlitz 319dc05ac36SSagi Grimberg /** 320dc05ac36SSagi Grimberg * iscsi_iser_cleanup_task() - cleanup an iscsi-iser task 321dc05ac36SSagi Grimberg * @task: iscsi task 322dc05ac36SSagi Grimberg * 323dc05ac36SSagi Grimberg * Notes: In case the RDMA device is already NULL (might have 324dc05ac36SSagi Grimberg * been removed in DEVICE_REMOVAL CM event it will bail-out 325dc05ac36SSagi Grimberg * without doing dma unmapping. 326dc05ac36SSagi Grimberg */ 3270f9c7449SMike Christie static void iscsi_iser_cleanup_task(struct iscsi_task *task) 32865e7ae7bSOr Gerlitz { 3292261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 33052439540SOr Gerlitz struct iser_tx_desc *tx_desc = &iser_task->desc; 3315716af6eSSagi Grimberg struct iser_conn *iser_conn = task->conn->dd_data; 332a4ee3539SSagi Grimberg struct iser_device *device = iser_conn->ib_conn.device; 33352439540SOr Gerlitz 3343a940dafSSagi Grimberg /* DEVICE_REMOVAL event might have already released the device */ 3353a940dafSSagi Grimberg if (!device) 3363a940dafSSagi Grimberg return; 3373a940dafSSagi Grimberg 33852439540SOr Gerlitz ib_dma_unmap_single(device->ib_device, 33952439540SOr Gerlitz tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 34065e7ae7bSOr Gerlitz 341b3cd5050SMike Christie /* mgmt tasks do not need special cleanup */ 342b3cd5050SMike Christie if (!task->sc) 3432747fdb2SMike Christie return; 34465e7ae7bSOr Gerlitz 3452261ec3dSMike Christie if (iser_task->status == ISER_TASK_STATUS_STARTED) { 3462261ec3dSMike Christie iser_task->status = ISER_TASK_STATUS_COMPLETED; 3472261ec3dSMike Christie iser_task_rdma_finalize(iser_task); 34865e7ae7bSOr Gerlitz } 34965e7ae7bSOr Gerlitz } 35065e7ae7bSOr Gerlitz 351dc05ac36SSagi Grimberg /** 352dc05ac36SSagi Grimberg * iscsi_iser_check_protection() - check protection information status of task. 353dc05ac36SSagi Grimberg * @task: iscsi task 354dc05ac36SSagi Grimberg * @sector: error sector if exsists (output) 355dc05ac36SSagi Grimberg * 356dc05ac36SSagi Grimberg * Return: zero if no data-integrity errors have occured 357dc05ac36SSagi Grimberg * 0x1: data-integrity error occured in the guard-block 358dc05ac36SSagi Grimberg * 0x2: data-integrity error occured in the reference tag 359dc05ac36SSagi Grimberg * 0x3: data-integrity error occured in the application tag 360dc05ac36SSagi Grimberg * 361dc05ac36SSagi Grimberg * In addition the error sector is marked. 362dc05ac36SSagi Grimberg */ 363dc05ac36SSagi Grimberg static u8 364dc05ac36SSagi Grimberg iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector) 3650a7a08adSSagi Grimberg { 3660a7a08adSSagi Grimberg struct iscsi_iser_task *iser_task = task->dd_data; 3670a7a08adSSagi Grimberg 3680a7a08adSSagi Grimberg if (iser_task->dir[ISER_DIR_IN]) 3690a7a08adSSagi Grimberg return iser_check_task_pi_status(iser_task, ISER_DIR_IN, 3700a7a08adSSagi Grimberg sector); 3710a7a08adSSagi Grimberg else 3720a7a08adSSagi Grimberg return iser_check_task_pi_status(iser_task, ISER_DIR_OUT, 3730a7a08adSSagi Grimberg sector); 3740a7a08adSSagi Grimberg } 3750a7a08adSSagi Grimberg 376dc05ac36SSagi Grimberg /** 377dc05ac36SSagi Grimberg * iscsi_iser_conn_create() - create a new iscsi-iser connection 378dc05ac36SSagi Grimberg * @cls_session: iscsi class connection 379dc05ac36SSagi Grimberg * @conn_idx: connection index within the session (for MCS) 380dc05ac36SSagi Grimberg * 381dc05ac36SSagi Grimberg * Return: iscsi_cls_conn when iscsi_conn_setup succeeds or NULL 382dc05ac36SSagi Grimberg * otherwise. 383dc05ac36SSagi Grimberg */ 38465e7ae7bSOr Gerlitz static struct iscsi_cls_conn * 385dc05ac36SSagi Grimberg iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, 386dc05ac36SSagi Grimberg uint32_t conn_idx) 38765e7ae7bSOr Gerlitz { 38865e7ae7bSOr Gerlitz struct iscsi_conn *conn; 38965e7ae7bSOr Gerlitz struct iscsi_cls_conn *cls_conn; 39065e7ae7bSOr Gerlitz 3914667f5dfSAriel Nahum cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx); 39265e7ae7bSOr Gerlitz if (!cls_conn) 39365e7ae7bSOr Gerlitz return NULL; 39465e7ae7bSOr Gerlitz conn = cls_conn->dd_data; 39565e7ae7bSOr Gerlitz 39665e7ae7bSOr Gerlitz /* 39765e7ae7bSOr Gerlitz * due to issues with the login code re iser sematics 39865e7ae7bSOr Gerlitz * this not set in iscsi_conn_setup - FIXME 39965e7ae7bSOr Gerlitz */ 400bcc60c38SOr Gerlitz conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; 40165e7ae7bSOr Gerlitz 40265e7ae7bSOr Gerlitz return cls_conn; 40365e7ae7bSOr Gerlitz } 40465e7ae7bSOr Gerlitz 405dc05ac36SSagi Grimberg /** 406dc05ac36SSagi Grimberg * iscsi_iser_conn_bind() - bind iscsi and iser connection structures 407dc05ac36SSagi Grimberg * @cls_session: iscsi class session 408dc05ac36SSagi Grimberg * @cls_conn: iscsi class connection 409dc05ac36SSagi Grimberg * @transport_eph: transport end-point handle 410dc05ac36SSagi Grimberg * @is_leading: indicate if this is the session leading connection (MCS) 411dc05ac36SSagi Grimberg * 412dc05ac36SSagi Grimberg * Return: zero on success, $error if iscsi_conn_bind fails and 413dc05ac36SSagi Grimberg * -EINVAL in case end-point doesn't exsits anymore or iser connection 414dc05ac36SSagi Grimberg * state is not UP (teardown already started). 415dc05ac36SSagi Grimberg */ 41665e7ae7bSOr Gerlitz static int 41765e7ae7bSOr Gerlitz iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 418dc05ac36SSagi Grimberg struct iscsi_cls_conn *cls_conn, 419dc05ac36SSagi Grimberg uint64_t transport_eph, 42065e7ae7bSOr Gerlitz int is_leading) 42165e7ae7bSOr Gerlitz { 42265e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 4235716af6eSSagi Grimberg struct iser_conn *iser_conn; 424412eeafaSMike Christie struct iscsi_endpoint *ep; 42565e7ae7bSOr Gerlitz int error; 42665e7ae7bSOr Gerlitz 42765e7ae7bSOr Gerlitz error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 42865e7ae7bSOr Gerlitz if (error) 42965e7ae7bSOr Gerlitz return error; 43065e7ae7bSOr Gerlitz 43165e7ae7bSOr Gerlitz /* the transport ep handle comes from user space so it must be 43265e7ae7bSOr Gerlitz * verified against the global ib connections list */ 433412eeafaSMike Christie ep = iscsi_lookup_endpoint(transport_eph); 434412eeafaSMike Christie if (!ep) { 43565e7ae7bSOr Gerlitz iser_err("can't bind eph %llx\n", 43665e7ae7bSOr Gerlitz (unsigned long long)transport_eph); 43765e7ae7bSOr Gerlitz return -EINVAL; 43865e7ae7bSOr Gerlitz } 4395716af6eSSagi Grimberg iser_conn = ep->dd_data; 440412eeafaSMike Christie 4415716af6eSSagi Grimberg mutex_lock(&iser_conn->state_mutex); 4425716af6eSSagi Grimberg if (iser_conn->state != ISER_CONN_UP) { 44391eb1df3SSagi Grimberg error = -EINVAL; 44491eb1df3SSagi Grimberg iser_err("iser_conn %p state is %d, teardown started\n", 4455716af6eSSagi Grimberg iser_conn, iser_conn->state); 44691eb1df3SSagi Grimberg goto out; 44791eb1df3SSagi Grimberg } 44891eb1df3SSagi Grimberg 4495716af6eSSagi Grimberg error = iser_alloc_rx_descriptors(iser_conn, conn->session); 45091eb1df3SSagi Grimberg if (error) 45191eb1df3SSagi Grimberg goto out; 45289e984e2SOr Gerlitz 45365e7ae7bSOr Gerlitz /* binds the iSER connection retrieved from the previously 45465e7ae7bSOr Gerlitz * connected ep_handle to the iSCSI layer connection. exchanges 45565e7ae7bSOr Gerlitz * connection pointers */ 4565716af6eSSagi Grimberg iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn); 4574667f5dfSAriel Nahum 4585716af6eSSagi Grimberg conn->dd_data = iser_conn; 4595716af6eSSagi Grimberg iser_conn->iscsi_conn = conn; 4604667f5dfSAriel Nahum 46191eb1df3SSagi Grimberg out: 4625716af6eSSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 46391eb1df3SSagi Grimberg return error; 46465e7ae7bSOr Gerlitz } 46565e7ae7bSOr Gerlitz 466dc05ac36SSagi Grimberg /** 467dc05ac36SSagi Grimberg * iscsi_iser_conn_start() - start iscsi-iser connection 468dc05ac36SSagi Grimberg * @cls_conn: iscsi class connection 469dc05ac36SSagi Grimberg * 470dc05ac36SSagi Grimberg * Notes: Here iser intialize (or re-initialize) stop_completion as 471dc05ac36SSagi Grimberg * from this point iscsi must call conn_stop in session/connection 472dc05ac36SSagi Grimberg * teardown so iser transport must wait for it. 473dc05ac36SSagi Grimberg */ 474b73c3adaSAriel Nahum static int 475b73c3adaSAriel Nahum iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 476b73c3adaSAriel Nahum { 477b73c3adaSAriel Nahum struct iscsi_conn *iscsi_conn; 4785716af6eSSagi Grimberg struct iser_conn *iser_conn; 479b73c3adaSAriel Nahum 480b73c3adaSAriel Nahum iscsi_conn = cls_conn->dd_data; 4815716af6eSSagi Grimberg iser_conn = iscsi_conn->dd_data; 4825716af6eSSagi Grimberg reinit_completion(&iser_conn->stop_completion); 483b73c3adaSAriel Nahum 484b73c3adaSAriel Nahum return iscsi_conn_start(cls_conn); 485b73c3adaSAriel Nahum } 486b73c3adaSAriel Nahum 487dc05ac36SSagi Grimberg /** 488dc05ac36SSagi Grimberg * iscsi_iser_conn_stop() - stop iscsi-iser connection 489dc05ac36SSagi Grimberg * @cls_conn: iscsi class connection 490dc05ac36SSagi Grimberg * @flag: indicate if recover or terminate (passed as is) 491dc05ac36SSagi Grimberg * 492dc05ac36SSagi Grimberg * Notes: Calling iscsi_conn_stop might theoretically race with 493dc05ac36SSagi Grimberg * DEVICE_REMOVAL event and dereference a previously freed RDMA device 494dc05ac36SSagi Grimberg * handle, so we call it under iser the state lock to protect against 495dc05ac36SSagi Grimberg * this kind of race. 496dc05ac36SSagi Grimberg */ 497b40977d9SMike Christie static void 498b40977d9SMike Christie iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 499b40977d9SMike Christie { 500b40977d9SMike Christie struct iscsi_conn *conn = cls_conn->dd_data; 5015716af6eSSagi Grimberg struct iser_conn *iser_conn = conn->dd_data; 502b40977d9SMike Christie 503bba0a3c9SAriel Nahum iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn); 504b73c3adaSAriel Nahum 505913e5bf4SMike Christie /* 506913e5bf4SMike Christie * Userspace may have goofed up and not bound the connection or 507913e5bf4SMike Christie * might have only partially setup the connection. 508913e5bf4SMike Christie */ 5095716af6eSSagi Grimberg if (iser_conn) { 510ec370e2bSAriel Nahum mutex_lock(&iser_conn->state_mutex); 5113a940dafSSagi Grimberg iscsi_conn_stop(cls_conn, flag); 512ec370e2bSAriel Nahum iser_conn_terminate(iser_conn); 513ec370e2bSAriel Nahum 514ec370e2bSAriel Nahum /* unbind */ 515ec370e2bSAriel Nahum iser_conn->iscsi_conn = NULL; 5164667f5dfSAriel Nahum conn->dd_data = NULL; 517ec370e2bSAriel Nahum 5185716af6eSSagi Grimberg complete(&iser_conn->stop_completion); 519ec370e2bSAriel Nahum mutex_unlock(&iser_conn->state_mutex); 5203a940dafSSagi Grimberg } else { 5213a940dafSSagi Grimberg iscsi_conn_stop(cls_conn, flag); 522b73c3adaSAriel Nahum } 523b40977d9SMike Christie } 524b40977d9SMike Christie 525dc05ac36SSagi Grimberg /** 526dc05ac36SSagi Grimberg * iscsi_iser_session_destroy() - destroy iscsi-iser session 527dc05ac36SSagi Grimberg * @cls_session: iscsi class session 528dc05ac36SSagi Grimberg * 529dc05ac36SSagi Grimberg * Removes and free iscsi host. 530dc05ac36SSagi Grimberg */ 531dc05ac36SSagi Grimberg static void 532dc05ac36SSagi Grimberg iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 53375613521SMike Christie { 53475613521SMike Christie struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 53575613521SMike Christie 536e5bd7b54SMike Christie iscsi_session_teardown(cls_session); 537a4804cd6SMike Christie iscsi_host_remove(shost); 538a4804cd6SMike Christie iscsi_host_free(shost); 53975613521SMike Christie } 54065e7ae7bSOr Gerlitz 5416192d4e6SSagi Grimberg static inline unsigned int 5426192d4e6SSagi Grimberg iser_dif_prot_caps(int prot_caps) 5436192d4e6SSagi Grimberg { 5446192d4e6SSagi Grimberg return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? SHOST_DIF_TYPE1_PROTECTION | 5456192d4e6SSagi Grimberg SHOST_DIX_TYPE1_PROTECTION : 0) | 5466192d4e6SSagi Grimberg ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? SHOST_DIF_TYPE2_PROTECTION | 5476192d4e6SSagi Grimberg SHOST_DIX_TYPE2_PROTECTION : 0) | 5486192d4e6SSagi Grimberg ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? SHOST_DIF_TYPE3_PROTECTION | 5496192d4e6SSagi Grimberg SHOST_DIX_TYPE3_PROTECTION : 0); 5506192d4e6SSagi Grimberg } 5516192d4e6SSagi Grimberg 552dc05ac36SSagi Grimberg /** 553dc05ac36SSagi Grimberg * iscsi_iser_session_create() - create an iscsi-iser session 554dc05ac36SSagi Grimberg * @ep: iscsi end-point handle 555dc05ac36SSagi Grimberg * @cmds_max: maximum commands in this session 556dc05ac36SSagi Grimberg * @qdepth: session command queue depth 557dc05ac36SSagi Grimberg * @initial_cmdsn: initiator command sequnce number 558dc05ac36SSagi Grimberg * 559dc05ac36SSagi Grimberg * Allocates and adds a scsi host, expose DIF supprot if 560dc05ac36SSagi Grimberg * exists, and sets up an iscsi session. 561dc05ac36SSagi Grimberg */ 56265e7ae7bSOr Gerlitz static struct iscsi_cls_session * 563412eeafaSMike Christie iscsi_iser_session_create(struct iscsi_endpoint *ep, 5641548271eSMike Christie uint16_t cmds_max, uint16_t qdepth, 5655e7facb7SMike Christie uint32_t initial_cmdsn) 56665e7ae7bSOr Gerlitz { 56765e7ae7bSOr Gerlitz struct iscsi_cls_session *cls_session; 56865e7ae7bSOr Gerlitz struct iscsi_session *session; 569412eeafaSMike Christie struct Scsi_Host *shost; 5705716af6eSSagi Grimberg struct iser_conn *iser_conn = NULL; 571a4ee3539SSagi Grimberg struct ib_conn *ib_conn; 57275613521SMike Christie 573962b4b52SOr Gerlitz shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); 57475613521SMike Christie if (!shost) 57575613521SMike Christie return NULL; 57675613521SMike Christie shost->transportt = iscsi_iser_scsi_transport; 577b7f04513SShlomo Pongratz shost->cmd_per_lun = qdepth; 57875613521SMike Christie shost->max_lun = iscsi_max_lun; 57975613521SMike Christie shost->max_id = 0; 58075613521SMike Christie shost->max_channel = 0; 58175613521SMike Christie shost->max_cmd_len = 16; 58275613521SMike Christie 583412eeafaSMike Christie /* 584412eeafaSMike Christie * older userspace tools (before 2.0-870) did not pass us 585412eeafaSMike Christie * the leading conn's ep so this will be NULL; 586412eeafaSMike Christie */ 5876192d4e6SSagi Grimberg if (ep) { 5885716af6eSSagi Grimberg iser_conn = ep->dd_data; 589a4ee3539SSagi Grimberg ib_conn = &iser_conn->ib_conn; 590a4ee3539SSagi Grimberg if (ib_conn->pi_support) { 591a4ee3539SSagi Grimberg u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap; 5926192d4e6SSagi Grimberg 5936192d4e6SSagi Grimberg scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps)); 5946192d4e6SSagi Grimberg if (iser_pi_guard) 5956192d4e6SSagi Grimberg scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); 5966192d4e6SSagi Grimberg else 5976192d4e6SSagi Grimberg scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC); 5986192d4e6SSagi Grimberg } 5996192d4e6SSagi Grimberg } 600412eeafaSMike Christie 6015716af6eSSagi Grimberg if (iscsi_host_add(shost, ep ? 602a4ee3539SSagi Grimberg ib_conn->device->ib_device->dma_device : NULL)) 60375613521SMike Christie goto free_host; 60465e7ae7bSOr Gerlitz 605b7f04513SShlomo Pongratz if (cmds_max > ISER_DEF_XMIT_CMDS_MAX) { 606b7f04513SShlomo Pongratz iser_info("cmds_max changed from %u to %u\n", 607b7f04513SShlomo Pongratz cmds_max, ISER_DEF_XMIT_CMDS_MAX); 608b7f04513SShlomo Pongratz cmds_max = ISER_DEF_XMIT_CMDS_MAX; 609b7f04513SShlomo Pongratz } 610b7f04513SShlomo Pongratz 61175613521SMike Christie cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 612b7f04513SShlomo Pongratz cmds_max, 0, 6132261ec3dSMike Christie sizeof(struct iscsi_iser_task), 6147970634bSMike Christie initial_cmdsn, 0); 61565e7ae7bSOr Gerlitz if (!cls_session) 61675613521SMike Christie goto remove_host; 61775613521SMike Christie session = cls_session->dd_data; 61865e7ae7bSOr Gerlitz 6192747fdb2SMike Christie shost->can_queue = session->scsi_cmds_max; 62065e7ae7bSOr Gerlitz return cls_session; 62175613521SMike Christie 62275613521SMike Christie remove_host: 623a4804cd6SMike Christie iscsi_host_remove(shost); 62475613521SMike Christie free_host: 625a4804cd6SMike Christie iscsi_host_free(shost); 62675613521SMike Christie return NULL; 62765e7ae7bSOr Gerlitz } 62865e7ae7bSOr Gerlitz 62965e7ae7bSOr Gerlitz static int 630358ff019SMike Christie iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 631358ff019SMike Christie enum iscsi_param param, char *buf, int buflen) 63265e7ae7bSOr Gerlitz { 633358ff019SMike Christie int value; 63465e7ae7bSOr Gerlitz 63565e7ae7bSOr Gerlitz switch (param) { 63665e7ae7bSOr Gerlitz case ISCSI_PARAM_MAX_RECV_DLENGTH: 63765e7ae7bSOr Gerlitz /* TBD */ 63865e7ae7bSOr Gerlitz break; 63965e7ae7bSOr Gerlitz case ISCSI_PARAM_HDRDGST_EN: 640358ff019SMike Christie sscanf(buf, "%d", &value); 64165e7ae7bSOr Gerlitz if (value) { 642e7eeffa4SRoi Dayan iser_err("DataDigest wasn't negotiated to None\n"); 64365e7ae7bSOr Gerlitz return -EPROTO; 64465e7ae7bSOr Gerlitz } 64565e7ae7bSOr Gerlitz break; 64665e7ae7bSOr Gerlitz case ISCSI_PARAM_DATADGST_EN: 647358ff019SMike Christie sscanf(buf, "%d", &value); 64865e7ae7bSOr Gerlitz if (value) { 649e7eeffa4SRoi Dayan iser_err("DataDigest wasn't negotiated to None\n"); 65065e7ae7bSOr Gerlitz return -EPROTO; 65165e7ae7bSOr Gerlitz } 65265e7ae7bSOr Gerlitz break; 65365e7ae7bSOr Gerlitz case ISCSI_PARAM_IFMARKER_EN: 654358ff019SMike Christie sscanf(buf, "%d", &value); 65565e7ae7bSOr Gerlitz if (value) { 656e7eeffa4SRoi Dayan iser_err("IFMarker wasn't negotiated to No\n"); 65765e7ae7bSOr Gerlitz return -EPROTO; 65865e7ae7bSOr Gerlitz } 65965e7ae7bSOr Gerlitz break; 66065e7ae7bSOr Gerlitz case ISCSI_PARAM_OFMARKER_EN: 661358ff019SMike Christie sscanf(buf, "%d", &value); 66265e7ae7bSOr Gerlitz if (value) { 663e7eeffa4SRoi Dayan iser_err("OFMarker wasn't negotiated to No\n"); 66465e7ae7bSOr Gerlitz return -EPROTO; 66565e7ae7bSOr Gerlitz } 66665e7ae7bSOr Gerlitz break; 66765e7ae7bSOr Gerlitz default: 668358ff019SMike Christie return iscsi_set_param(cls_conn, param, buf, buflen); 66965e7ae7bSOr Gerlitz } 67065e7ae7bSOr Gerlitz 67165e7ae7bSOr Gerlitz return 0; 67265e7ae7bSOr Gerlitz } 67365e7ae7bSOr Gerlitz 674dc05ac36SSagi Grimberg /** 675dc05ac36SSagi Grimberg * iscsi_iser_set_param() - set class connection parameter 676dc05ac36SSagi Grimberg * @cls_conn: iscsi class connection 677dc05ac36SSagi Grimberg * @stats: iscsi stats to output 678dc05ac36SSagi Grimberg * 679dc05ac36SSagi Grimberg * Output connection statistics. 680dc05ac36SSagi Grimberg */ 68165e7ae7bSOr Gerlitz static void 68265e7ae7bSOr Gerlitz iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 68365e7ae7bSOr Gerlitz { 68465e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 68565e7ae7bSOr Gerlitz 68665e7ae7bSOr Gerlitz stats->txdata_octets = conn->txdata_octets; 68765e7ae7bSOr Gerlitz stats->rxdata_octets = conn->rxdata_octets; 68865e7ae7bSOr Gerlitz stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 68965e7ae7bSOr Gerlitz stats->dataout_pdus = conn->dataout_pdus_cnt; 69065e7ae7bSOr Gerlitz stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 69165e7ae7bSOr Gerlitz stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 69265e7ae7bSOr Gerlitz stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 69365e7ae7bSOr Gerlitz stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 69465e7ae7bSOr Gerlitz stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 69587528227SEli Dorfman stats->custom_length = 4; 69665e7ae7bSOr Gerlitz strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 69765e7ae7bSOr Gerlitz stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 69865e7ae7bSOr Gerlitz strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 69965e7ae7bSOr Gerlitz stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 70065e7ae7bSOr Gerlitz strcpy(stats->custom[2].desc, "eh_abort_cnt"); 70165e7ae7bSOr Gerlitz stats->custom[2].value = conn->eh_abort_cnt; 70287528227SEli Dorfman strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 70387528227SEli Dorfman stats->custom[3].value = conn->fmr_unalign_cnt; 70465e7ae7bSOr Gerlitz } 70565e7ae7bSOr Gerlitz 7067c53c6f8SMike Christie static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, 7077c53c6f8SMike Christie enum iscsi_param param, char *buf) 7087c53c6f8SMike Christie { 7095716af6eSSagi Grimberg struct iser_conn *iser_conn = ep->dd_data; 7107c53c6f8SMike Christie int len; 7117c53c6f8SMike Christie 7127c53c6f8SMike Christie switch (param) { 7137c53c6f8SMike Christie case ISCSI_PARAM_CONN_PORT: 7147c53c6f8SMike Christie case ISCSI_PARAM_CONN_ADDRESS: 715a4ee3539SSagi Grimberg if (!iser_conn || !iser_conn->ib_conn.cma_id) 7167c53c6f8SMike Christie return -ENOTCONN; 7177c53c6f8SMike Christie 7187c53c6f8SMike Christie return iscsi_conn_get_addr_param((struct sockaddr_storage *) 719a4ee3539SSagi Grimberg &iser_conn->ib_conn.cma_id->route.addr.dst_addr, 7207c53c6f8SMike Christie param, buf); 7217c53c6f8SMike Christie break; 7227c53c6f8SMike Christie default: 7237c53c6f8SMike Christie return -ENOSYS; 7247c53c6f8SMike Christie } 7257c53c6f8SMike Christie 7267c53c6f8SMike Christie return len; 7277c53c6f8SMike Christie } 7287c53c6f8SMike Christie 729dc05ac36SSagi Grimberg /** 730dc05ac36SSagi Grimberg * iscsi_iser_ep_connect() - Initiate iSER connection establishment 731dc05ac36SSagi Grimberg * @shost: scsi_host 732dc05ac36SSagi Grimberg * @dst_addr: destination address 733dc05ac36SSagi Grimberg * @non-blocking: indicate if routine can block 734dc05ac36SSagi Grimberg * 735dc05ac36SSagi Grimberg * Allocate an iscsi endpoint, an iser_conn structure and bind them. 736dc05ac36SSagi Grimberg * After that start RDMA connection establishment via rdma_cm. We 737dc05ac36SSagi Grimberg * don't allocate iser_conn embedded in iscsi_endpoint since in teardown 738dc05ac36SSagi Grimberg * the endpoint will be destroyed at ep_disconnect while iser_conn will 739dc05ac36SSagi Grimberg * cleanup its resources asynchronuously. 740dc05ac36SSagi Grimberg * 741dc05ac36SSagi Grimberg * Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error) 742dc05ac36SSagi Grimberg * if fails. 743dc05ac36SSagi Grimberg */ 744412eeafaSMike Christie static struct iscsi_endpoint * 74510eb0f01SMike Christie iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, 74610eb0f01SMike Christie int non_blocking) 74765e7ae7bSOr Gerlitz { 74865e7ae7bSOr Gerlitz int err; 7495716af6eSSagi Grimberg struct iser_conn *iser_conn; 750412eeafaSMike Christie struct iscsi_endpoint *ep; 75165e7ae7bSOr Gerlitz 7520a690758SAriel Nahum ep = iscsi_create_endpoint(0); 753412eeafaSMike Christie if (!ep) 754412eeafaSMike Christie return ERR_PTR(-ENOMEM); 75565e7ae7bSOr Gerlitz 7565716af6eSSagi Grimberg iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL); 7575716af6eSSagi Grimberg if (!iser_conn) { 7580a690758SAriel Nahum err = -ENOMEM; 7590a690758SAriel Nahum goto failure; 7600a690758SAriel Nahum } 7610a690758SAriel Nahum 7625716af6eSSagi Grimberg ep->dd_data = iser_conn; 7635716af6eSSagi Grimberg iser_conn->ep = ep; 7645716af6eSSagi Grimberg iser_conn_init(iser_conn); 76565e7ae7bSOr Gerlitz 7665716af6eSSagi Grimberg err = iser_connect(iser_conn, NULL, dst_addr, non_blocking); 7677d9c0de4SOr Gerlitz if (err) 7680a690758SAriel Nahum goto failure; 7697d9c0de4SOr Gerlitz 770412eeafaSMike Christie return ep; 7710a690758SAriel Nahum failure: 7720a690758SAriel Nahum iscsi_destroy_endpoint(ep); 7730a690758SAriel Nahum return ERR_PTR(err); 77465e7ae7bSOr Gerlitz } 77565e7ae7bSOr Gerlitz 776dc05ac36SSagi Grimberg /** 777dc05ac36SSagi Grimberg * iscsi_iser_ep_poll() - poll for iser connection establishment to complete 778dc05ac36SSagi Grimberg * @ep: iscsi endpoint (created at ep_connect) 779dc05ac36SSagi Grimberg * @timeout_ms: polling timeout allowed in ms. 780dc05ac36SSagi Grimberg * 781dc05ac36SSagi Grimberg * This routine boils down to waiting for up_completion signaling 782dc05ac36SSagi Grimberg * that cma_id got CONNECTED event. 783dc05ac36SSagi Grimberg * 784dc05ac36SSagi Grimberg * Return: 1 if succeeded in connection establishment, 0 if timeout expired 785dc05ac36SSagi Grimberg * (libiscsi will retry will kick in) or -1 if interrupted by signal 786dc05ac36SSagi Grimberg * or more likely iser connection state transitioned to TEMINATING or 787dc05ac36SSagi Grimberg * DOWN during the wait period. 788dc05ac36SSagi Grimberg */ 78965e7ae7bSOr Gerlitz static int 790412eeafaSMike Christie iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 79165e7ae7bSOr Gerlitz { 7925716af6eSSagi Grimberg struct iser_conn *iser_conn; 79365e7ae7bSOr Gerlitz int rc; 79465e7ae7bSOr Gerlitz 7955716af6eSSagi Grimberg iser_conn = ep->dd_data; 7965716af6eSSagi Grimberg rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion, 79765e7ae7bSOr Gerlitz msecs_to_jiffies(timeout_ms)); 79865e7ae7bSOr Gerlitz /* if conn establishment failed, return error code to iscsi */ 799504130c0SAriel Nahum if (rc == 0) { 8005716af6eSSagi Grimberg mutex_lock(&iser_conn->state_mutex); 8015716af6eSSagi Grimberg if (iser_conn->state == ISER_CONN_TERMINATING || 8025716af6eSSagi Grimberg iser_conn->state == ISER_CONN_DOWN) 80365e7ae7bSOr Gerlitz rc = -1; 8045716af6eSSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 805504130c0SAriel Nahum } 80665e7ae7bSOr Gerlitz 8075716af6eSSagi Grimberg iser_info("ib conn %p rc = %d\n", iser_conn, rc); 80865e7ae7bSOr Gerlitz 80965e7ae7bSOr Gerlitz if (rc > 0) 81065e7ae7bSOr Gerlitz return 1; /* success, this is the equivalent of POLLOUT */ 81165e7ae7bSOr Gerlitz else if (!rc) 81265e7ae7bSOr Gerlitz return 0; /* timeout */ 81365e7ae7bSOr Gerlitz else 81465e7ae7bSOr Gerlitz return rc; /* signal */ 81565e7ae7bSOr Gerlitz } 81665e7ae7bSOr Gerlitz 817dc05ac36SSagi Grimberg /** 818dc05ac36SSagi Grimberg * iscsi_iser_ep_disconnect() - Initiate connection teardown process 819dc05ac36SSagi Grimberg * @ep: iscsi endpoint handle 820dc05ac36SSagi Grimberg * 821dc05ac36SSagi Grimberg * This routine is not blocked by iser and RDMA termination process 822dc05ac36SSagi Grimberg * completion as we queue a deffered work for iser/RDMA destruction 823dc05ac36SSagi Grimberg * and cleanup or actually call it immediately in case we didn't pass 824dc05ac36SSagi Grimberg * iscsi conn bind/start stage, thus it is safe. 825dc05ac36SSagi Grimberg */ 82665e7ae7bSOr Gerlitz static void 827412eeafaSMike Christie iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 82865e7ae7bSOr Gerlitz { 8295716af6eSSagi Grimberg struct iser_conn *iser_conn; 83065e7ae7bSOr Gerlitz 8315716af6eSSagi Grimberg iser_conn = ep->dd_data; 8325716af6eSSagi Grimberg iser_info("ep %p iser conn %p state %d\n", 8335716af6eSSagi Grimberg ep, iser_conn, iser_conn->state); 8345716af6eSSagi Grimberg 8355716af6eSSagi Grimberg mutex_lock(&iser_conn->state_mutex); 8365716af6eSSagi Grimberg iser_conn_terminate(iser_conn); 837b73c3adaSAriel Nahum 838b73c3adaSAriel Nahum /* 8399a6d3234SAriel Nahum * if iser_conn and iscsi_conn are bound, we must wait for 8409a6d3234SAriel Nahum * iscsi_conn_stop and flush errors completion before freeing 8419a6d3234SAriel Nahum * the iser resources. Otherwise we are safe to free resources 8429a6d3234SAriel Nahum * immediately. 843b73c3adaSAriel Nahum */ 8445716af6eSSagi Grimberg if (iser_conn->iscsi_conn) { 8455716af6eSSagi Grimberg INIT_WORK(&iser_conn->release_work, iser_release_work); 8465716af6eSSagi Grimberg queue_work(release_wq, &iser_conn->release_work); 8475716af6eSSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 848b73c3adaSAriel Nahum } else { 8495716af6eSSagi Grimberg iser_conn->state = ISER_CONN_DOWN; 8505716af6eSSagi Grimberg mutex_unlock(&iser_conn->state_mutex); 8515716af6eSSagi Grimberg iser_conn_release(iser_conn); 852b73c3adaSAriel Nahum } 8530a690758SAriel Nahum iscsi_destroy_endpoint(ep); 85465e7ae7bSOr Gerlitz } 85565e7ae7bSOr Gerlitz 856587a1f16SAl Viro static umode_t iser_attr_is_visible(int param_type, int param) 8573128c6c7SMike Christie { 8583128c6c7SMike Christie switch (param_type) { 859f27fb2efSMike Christie case ISCSI_HOST_PARAM: 860f27fb2efSMike Christie switch (param) { 861f27fb2efSMike Christie case ISCSI_HOST_PARAM_NETDEV_NAME: 862f27fb2efSMike Christie case ISCSI_HOST_PARAM_HWADDRESS: 863f27fb2efSMike Christie case ISCSI_HOST_PARAM_INITIATOR_NAME: 864f27fb2efSMike Christie return S_IRUGO; 865f27fb2efSMike Christie default: 866f27fb2efSMike Christie return 0; 867f27fb2efSMike Christie } 8683128c6c7SMike Christie case ISCSI_PARAM: 8693128c6c7SMike Christie switch (param) { 8703128c6c7SMike Christie case ISCSI_PARAM_MAX_RECV_DLENGTH: 8713128c6c7SMike Christie case ISCSI_PARAM_MAX_XMIT_DLENGTH: 8723128c6c7SMike Christie case ISCSI_PARAM_HDRDGST_EN: 8733128c6c7SMike Christie case ISCSI_PARAM_DATADGST_EN: 8743128c6c7SMike Christie case ISCSI_PARAM_CONN_ADDRESS: 8753128c6c7SMike Christie case ISCSI_PARAM_CONN_PORT: 8763128c6c7SMike Christie case ISCSI_PARAM_EXP_STATSN: 8773128c6c7SMike Christie case ISCSI_PARAM_PERSISTENT_ADDRESS: 8783128c6c7SMike Christie case ISCSI_PARAM_PERSISTENT_PORT: 8793128c6c7SMike Christie case ISCSI_PARAM_PING_TMO: 8803128c6c7SMike Christie case ISCSI_PARAM_RECV_TMO: 8811d063c17SMike Christie case ISCSI_PARAM_INITIAL_R2T_EN: 8821d063c17SMike Christie case ISCSI_PARAM_MAX_R2T: 8831d063c17SMike Christie case ISCSI_PARAM_IMM_DATA_EN: 8841d063c17SMike Christie case ISCSI_PARAM_FIRST_BURST: 8851d063c17SMike Christie case ISCSI_PARAM_MAX_BURST: 8861d063c17SMike Christie case ISCSI_PARAM_PDU_INORDER_EN: 8871d063c17SMike Christie case ISCSI_PARAM_DATASEQ_INORDER_EN: 8881d063c17SMike Christie case ISCSI_PARAM_TARGET_NAME: 8891d063c17SMike Christie case ISCSI_PARAM_TPGT: 8901d063c17SMike Christie case ISCSI_PARAM_USERNAME: 8911d063c17SMike Christie case ISCSI_PARAM_PASSWORD: 8921d063c17SMike Christie case ISCSI_PARAM_USERNAME_IN: 8931d063c17SMike Christie case ISCSI_PARAM_PASSWORD_IN: 8941d063c17SMike Christie case ISCSI_PARAM_FAST_ABORT: 8951d063c17SMike Christie case ISCSI_PARAM_ABORT_TMO: 8961d063c17SMike Christie case ISCSI_PARAM_LU_RESET_TMO: 8971d063c17SMike Christie case ISCSI_PARAM_TGT_RESET_TMO: 8981d063c17SMike Christie case ISCSI_PARAM_IFACE_NAME: 8991d063c17SMike Christie case ISCSI_PARAM_INITIATOR_NAME: 9006a06a4b8SOr Gerlitz case ISCSI_PARAM_DISCOVERY_SESS: 9013128c6c7SMike Christie return S_IRUGO; 9023128c6c7SMike Christie default: 9033128c6c7SMike Christie return 0; 9043128c6c7SMike Christie } 9053128c6c7SMike Christie } 9063128c6c7SMike Christie 9073128c6c7SMike Christie return 0; 9083128c6c7SMike Christie } 9093128c6c7SMike Christie 91065e7ae7bSOr Gerlitz static struct scsi_host_template iscsi_iser_sht = { 9117974392cSMike Christie .module = THIS_MODULE, 912c1d786e6SRoi Dayan .name = "iSCSI Initiator over iSER", 91365e7ae7bSOr Gerlitz .queuecommand = iscsi_queuecommand, 9146410627eSErez Zilber .change_queue_depth = iscsi_change_queue_depth, 91565e7ae7bSOr Gerlitz .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 9168072ec2fSErez Zilber .max_sectors = 1024, 917e28f3d5bSMike Christie .cmd_per_lun = ISER_DEF_CMD_PER_LUN, 91865e7ae7bSOr Gerlitz .eh_abort_handler = iscsi_eh_abort, 91990c18f3cSErez Zilber .eh_device_reset_handler= iscsi_eh_device_reset, 920309ce156SJayamohan Kallickal .eh_target_reset_handler = iscsi_eh_recover_target, 9216b5d6c44SMike Christie .target_alloc = iscsi_target_alloc, 92265e7ae7bSOr Gerlitz .use_clustering = DISABLE_CLUSTERING, 92365e7ae7bSOr Gerlitz .proc_name = "iscsi_iser", 92465e7ae7bSOr Gerlitz .this_id = -1, 92565e7ae7bSOr Gerlitz }; 92665e7ae7bSOr Gerlitz 92765e7ae7bSOr Gerlitz static struct iscsi_transport iscsi_iser_transport = { 92865e7ae7bSOr Gerlitz .owner = THIS_MODULE, 92965e7ae7bSOr Gerlitz .name = "iser", 9306a06a4b8SOr Gerlitz .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO, 93165e7ae7bSOr Gerlitz /* session management */ 93265e7ae7bSOr Gerlitz .create_session = iscsi_iser_session_create, 93375613521SMike Christie .destroy_session = iscsi_iser_session_destroy, 93465e7ae7bSOr Gerlitz /* connection management */ 93565e7ae7bSOr Gerlitz .create_conn = iscsi_iser_conn_create, 93665e7ae7bSOr Gerlitz .bind_conn = iscsi_iser_conn_bind, 937b73c3adaSAriel Nahum .destroy_conn = iscsi_conn_teardown, 9383128c6c7SMike Christie .attr_is_visible = iser_attr_is_visible, 939358ff019SMike Christie .set_param = iscsi_iser_set_param, 940358ff019SMike Christie .get_conn_param = iscsi_conn_get_param, 9417c53c6f8SMike Christie .get_ep_param = iscsi_iser_get_ep_param, 942358ff019SMike Christie .get_session_param = iscsi_session_get_param, 943b73c3adaSAriel Nahum .start_conn = iscsi_iser_conn_start, 944b40977d9SMike Christie .stop_conn = iscsi_iser_conn_stop, 9450801c242SMike Christie /* iscsi host params */ 9460801c242SMike Christie .get_host_param = iscsi_host_get_param, 9470801c242SMike Christie .set_host_param = iscsi_host_set_param, 94865e7ae7bSOr Gerlitz /* IO */ 94965e7ae7bSOr Gerlitz .send_pdu = iscsi_conn_send_pdu, 95065e7ae7bSOr Gerlitz .get_stats = iscsi_iser_conn_get_stats, 9512747fdb2SMike Christie .init_task = iscsi_iser_task_init, 9522747fdb2SMike Christie .xmit_task = iscsi_iser_task_xmit, 9532747fdb2SMike Christie .cleanup_task = iscsi_iser_cleanup_task, 9540f9c7449SMike Christie .alloc_pdu = iscsi_iser_pdu_alloc, 9550a7a08adSSagi Grimberg .check_protection = iscsi_iser_check_protection, 95665e7ae7bSOr Gerlitz /* recovery */ 95765e7ae7bSOr Gerlitz .session_recovery_timedout = iscsi_session_recovery_timedout, 95865e7ae7bSOr Gerlitz 95965e7ae7bSOr Gerlitz .ep_connect = iscsi_iser_ep_connect, 96065e7ae7bSOr Gerlitz .ep_poll = iscsi_iser_ep_poll, 96165e7ae7bSOr Gerlitz .ep_disconnect = iscsi_iser_ep_disconnect 96265e7ae7bSOr Gerlitz }; 96365e7ae7bSOr Gerlitz 96465e7ae7bSOr Gerlitz static int __init iser_init(void) 96565e7ae7bSOr Gerlitz { 96665e7ae7bSOr Gerlitz int err; 96765e7ae7bSOr Gerlitz 96865e7ae7bSOr Gerlitz iser_dbg("Starting iSER datamover...\n"); 96965e7ae7bSOr Gerlitz 97065e7ae7bSOr Gerlitz if (iscsi_max_lun < 1) { 9714f363882SRoi Dayan iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); 97265e7ae7bSOr Gerlitz return -EINVAL; 97365e7ae7bSOr Gerlitz } 97465e7ae7bSOr Gerlitz 97565e7ae7bSOr Gerlitz memset(&ig, 0, sizeof(struct iser_global)); 97665e7ae7bSOr Gerlitz 97765e7ae7bSOr Gerlitz ig.desc_cache = kmem_cache_create("iser_descriptors", 978f19624aaSOr Gerlitz sizeof(struct iser_tx_desc), 97965e7ae7bSOr Gerlitz 0, SLAB_HWCACHE_ALIGN, 98020c2df83SPaul Mundt NULL); 98165e7ae7bSOr Gerlitz if (ig.desc_cache == NULL) 98265e7ae7bSOr Gerlitz return -ENOMEM; 98365e7ae7bSOr Gerlitz 98465e7ae7bSOr Gerlitz /* device init is called only after the first addr resolution */ 98565e7ae7bSOr Gerlitz mutex_init(&ig.device_list_mutex); 98665e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.device_list); 98765e7ae7bSOr Gerlitz mutex_init(&ig.connlist_mutex); 98865e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.connlist); 98965e7ae7bSOr Gerlitz 990b73c3adaSAriel Nahum release_wq = alloc_workqueue("release workqueue", 0, 0); 991b73c3adaSAriel Nahum if (!release_wq) { 992b73c3adaSAriel Nahum iser_err("failed to allocate release workqueue\n"); 993b73c3adaSAriel Nahum return -ENOMEM; 994b73c3adaSAriel Nahum } 995b73c3adaSAriel Nahum 99675613521SMike Christie iscsi_iser_scsi_transport = iscsi_register_transport( 99775613521SMike Christie &iscsi_iser_transport); 99875613521SMike Christie if (!iscsi_iser_scsi_transport) { 99965e7ae7bSOr Gerlitz iser_err("iscsi_register_transport failed\n"); 100065e7ae7bSOr Gerlitz err = -EINVAL; 100165e7ae7bSOr Gerlitz goto register_transport_failure; 100265e7ae7bSOr Gerlitz } 100365e7ae7bSOr Gerlitz 100465e7ae7bSOr Gerlitz return 0; 100565e7ae7bSOr Gerlitz 100665e7ae7bSOr Gerlitz register_transport_failure: 100765e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 100865e7ae7bSOr Gerlitz 100965e7ae7bSOr Gerlitz return err; 101065e7ae7bSOr Gerlitz } 101165e7ae7bSOr Gerlitz 101265e7ae7bSOr Gerlitz static void __exit iser_exit(void) 101365e7ae7bSOr Gerlitz { 10145716af6eSSagi Grimberg struct iser_conn *iser_conn, *n; 1015b73c3adaSAriel Nahum int connlist_empty; 1016b73c3adaSAriel Nahum 101765e7ae7bSOr Gerlitz iser_dbg("Removing iSER datamover...\n"); 1018b73c3adaSAriel Nahum destroy_workqueue(release_wq); 1019b73c3adaSAriel Nahum 1020b73c3adaSAriel Nahum mutex_lock(&ig.connlist_mutex); 1021b73c3adaSAriel Nahum connlist_empty = list_empty(&ig.connlist); 1022b73c3adaSAriel Nahum mutex_unlock(&ig.connlist_mutex); 1023b73c3adaSAriel Nahum 1024b73c3adaSAriel Nahum if (!connlist_empty) { 1025b73c3adaSAriel Nahum iser_err("Error cleanup stage completed but we still have iser " 1026b73c3adaSAriel Nahum "connections, destroying them anyway.\n"); 10275716af6eSSagi Grimberg list_for_each_entry_safe(iser_conn, n, &ig.connlist, 10285716af6eSSagi Grimberg conn_list) { 10295716af6eSSagi Grimberg iser_conn_release(iser_conn); 1030b73c3adaSAriel Nahum } 1031b73c3adaSAriel Nahum } 1032b73c3adaSAriel Nahum 103365e7ae7bSOr Gerlitz iscsi_unregister_transport(&iscsi_iser_transport); 103465e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 103565e7ae7bSOr Gerlitz } 103665e7ae7bSOr Gerlitz 103765e7ae7bSOr Gerlitz module_init(iser_init); 103865e7ae7bSOr Gerlitz module_exit(iser_exit); 1039