165e7ae7bSOr Gerlitz /* 265e7ae7bSOr Gerlitz * iSCSI Initiator over iSER Data-Path 365e7ae7bSOr Gerlitz * 465e7ae7bSOr Gerlitz * Copyright (C) 2004 Dmitry Yusupov 565e7ae7bSOr Gerlitz * Copyright (C) 2004 Alex Aizman 665e7ae7bSOr Gerlitz * Copyright (C) 2005 Mike Christie 765e7ae7bSOr Gerlitz * Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved. 865e7ae7bSOr Gerlitz * maintained by openib-general@openib.org 965e7ae7bSOr Gerlitz * 1065e7ae7bSOr Gerlitz * This software is available to you under a choice of one of two 1165e7ae7bSOr Gerlitz * licenses. You may choose to be licensed under the terms of the GNU 1265e7ae7bSOr Gerlitz * General Public License (GPL) Version 2, available from the file 1365e7ae7bSOr Gerlitz * COPYING in the main directory of this source tree, or the 1465e7ae7bSOr Gerlitz * OpenIB.org BSD license below: 1565e7ae7bSOr Gerlitz * 1665e7ae7bSOr Gerlitz * Redistribution and use in source and binary forms, with or 1765e7ae7bSOr Gerlitz * without modification, are permitted provided that the following 1865e7ae7bSOr Gerlitz * conditions are met: 1965e7ae7bSOr Gerlitz * 2065e7ae7bSOr Gerlitz * - Redistributions of source code must retain the above 2165e7ae7bSOr Gerlitz * copyright notice, this list of conditions and the following 2265e7ae7bSOr Gerlitz * disclaimer. 2365e7ae7bSOr Gerlitz * 2465e7ae7bSOr Gerlitz * - Redistributions in binary form must reproduce the above 2565e7ae7bSOr Gerlitz * copyright notice, this list of conditions and the following 2665e7ae7bSOr Gerlitz * disclaimer in the documentation and/or other materials 2765e7ae7bSOr Gerlitz * provided with the distribution. 2865e7ae7bSOr Gerlitz * 2965e7ae7bSOr Gerlitz * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 3065e7ae7bSOr Gerlitz * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 3165e7ae7bSOr Gerlitz * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 3265e7ae7bSOr Gerlitz * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 3365e7ae7bSOr Gerlitz * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 3465e7ae7bSOr Gerlitz * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 3565e7ae7bSOr Gerlitz * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 3665e7ae7bSOr Gerlitz * SOFTWARE. 3765e7ae7bSOr Gerlitz * 3865e7ae7bSOr Gerlitz * Credits: 3965e7ae7bSOr Gerlitz * Christoph Hellwig 4065e7ae7bSOr Gerlitz * FUJITA Tomonori 4165e7ae7bSOr Gerlitz * Arne Redlich 4265e7ae7bSOr Gerlitz * Zhenyu Wang 4365e7ae7bSOr Gerlitz * Modified by: 4465e7ae7bSOr Gerlitz * Erez Zilber 4565e7ae7bSOr Gerlitz */ 4665e7ae7bSOr Gerlitz 4765e7ae7bSOr Gerlitz #include <linux/types.h> 4865e7ae7bSOr Gerlitz #include <linux/list.h> 4965e7ae7bSOr Gerlitz #include <linux/hardirq.h> 5065e7ae7bSOr Gerlitz #include <linux/kfifo.h> 5165e7ae7bSOr Gerlitz #include <linux/blkdev.h> 5265e7ae7bSOr Gerlitz #include <linux/init.h> 5365e7ae7bSOr Gerlitz #include <linux/ioctl.h> 5465e7ae7bSOr Gerlitz #include <linux/cdev.h> 5565e7ae7bSOr Gerlitz #include <linux/in.h> 5665e7ae7bSOr Gerlitz #include <linux/net.h> 5765e7ae7bSOr Gerlitz #include <linux/scatterlist.h> 5865e7ae7bSOr Gerlitz #include <linux/delay.h> 595a0e3ad6STejun Heo #include <linux/slab.h> 60e4dd23d7SPaul Gortmaker #include <linux/module.h> 6165e7ae7bSOr Gerlitz 6265e7ae7bSOr Gerlitz #include <net/sock.h> 6365e7ae7bSOr Gerlitz 6465e7ae7bSOr Gerlitz #include <asm/uaccess.h> 6565e7ae7bSOr Gerlitz 6665e7ae7bSOr Gerlitz #include <scsi/scsi_cmnd.h> 6765e7ae7bSOr Gerlitz #include <scsi/scsi_device.h> 6865e7ae7bSOr Gerlitz #include <scsi/scsi_eh.h> 6965e7ae7bSOr Gerlitz #include <scsi/scsi_tcq.h> 7065e7ae7bSOr Gerlitz #include <scsi/scsi_host.h> 7165e7ae7bSOr Gerlitz #include <scsi/scsi.h> 7265e7ae7bSOr Gerlitz #include <scsi/scsi_transport_iscsi.h> 7365e7ae7bSOr Gerlitz 7465e7ae7bSOr Gerlitz #include "iscsi_iser.h" 7565e7ae7bSOr Gerlitz 7675613521SMike Christie static struct scsi_host_template iscsi_iser_sht; 7775613521SMike Christie static struct iscsi_transport iscsi_iser_transport; 7875613521SMike Christie static struct scsi_transport_template *iscsi_iser_scsi_transport; 7975613521SMike Christie 8065e7ae7bSOr Gerlitz static unsigned int iscsi_max_lun = 512; 8165e7ae7bSOr Gerlitz module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); 8265e7ae7bSOr Gerlitz 8365e7ae7bSOr Gerlitz int iser_debug_level = 0; 8465e7ae7bSOr Gerlitz 85c1d786e6SRoi Dayan MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover"); 8665e7ae7bSOr Gerlitz MODULE_LICENSE("Dual BSD/GPL"); 8765e7ae7bSOr Gerlitz MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); 88c1d786e6SRoi Dayan MODULE_VERSION(DRV_VER); 8965e7ae7bSOr Gerlitz 9065e7ae7bSOr Gerlitz module_param_named(debug_level, iser_debug_level, int, 0644); 9165e7ae7bSOr Gerlitz MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); 9265e7ae7bSOr Gerlitz 9365e7ae7bSOr Gerlitz struct iser_global ig; 9465e7ae7bSOr Gerlitz 9565e7ae7bSOr Gerlitz void 9665e7ae7bSOr Gerlitz iscsi_iser_recv(struct iscsi_conn *conn, 9765e7ae7bSOr Gerlitz struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) 9865e7ae7bSOr Gerlitz { 9965e7ae7bSOr Gerlitz int rc = 0; 10065e7ae7bSOr Gerlitz int datalen; 10165e7ae7bSOr Gerlitz int ahslen; 10265e7ae7bSOr Gerlitz 10365e7ae7bSOr Gerlitz /* verify PDU length */ 10465e7ae7bSOr Gerlitz datalen = ntoh24(hdr->dlength); 105200ae1a0SOr Gerlitz if (datalen > rx_data_len || (datalen + 4) < rx_data_len) { 106200ae1a0SOr Gerlitz iser_err("wrong datalen %d (hdr), %d (IB)\n", 10765e7ae7bSOr Gerlitz datalen, rx_data_len); 10865e7ae7bSOr Gerlitz rc = ISCSI_ERR_DATALEN; 10965e7ae7bSOr Gerlitz goto error; 11065e7ae7bSOr Gerlitz } 11165e7ae7bSOr Gerlitz 112200ae1a0SOr Gerlitz if (datalen != rx_data_len) 113200ae1a0SOr Gerlitz iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", 114200ae1a0SOr Gerlitz datalen, rx_data_len); 115200ae1a0SOr Gerlitz 11665e7ae7bSOr Gerlitz /* read AHS */ 11765e7ae7bSOr Gerlitz ahslen = hdr->hlength * 4; 11865e7ae7bSOr Gerlitz 11965e7ae7bSOr Gerlitz rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 12065e7ae7bSOr Gerlitz if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 12165e7ae7bSOr Gerlitz goto error; 12265e7ae7bSOr Gerlitz 12365e7ae7bSOr Gerlitz return; 12465e7ae7bSOr Gerlitz error: 12565e7ae7bSOr Gerlitz iscsi_conn_failure(conn, rc); 12665e7ae7bSOr Gerlitz } 12765e7ae7bSOr Gerlitz 1282ff79d52SMike Christie static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) 1290f9c7449SMike Christie { 1300f9c7449SMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 1310f9c7449SMike Christie 1320f9c7449SMike Christie task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; 1330f9c7449SMike Christie task->hdr_max = sizeof(iser_task->desc.iscsi_header); 1340f9c7449SMike Christie return 0; 1350f9c7449SMike Christie } 13665e7ae7bSOr Gerlitz 137f19624aaSOr Gerlitz int iser_initialize_task_headers(struct iscsi_task *task, 138f19624aaSOr Gerlitz struct iser_tx_desc *tx_desc) 139f19624aaSOr Gerlitz { 140f19624aaSOr Gerlitz struct iscsi_iser_conn *iser_conn = task->conn->dd_data; 141f19624aaSOr Gerlitz struct iser_device *device = iser_conn->ib_conn->device; 142f19624aaSOr Gerlitz struct iscsi_iser_task *iser_task = task->dd_data; 143f19624aaSOr Gerlitz u64 dma_addr; 144f19624aaSOr Gerlitz 145f19624aaSOr Gerlitz dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, 146f19624aaSOr Gerlitz ISER_HEADERS_LEN, DMA_TO_DEVICE); 147f19624aaSOr Gerlitz if (ib_dma_mapping_error(device->ib_device, dma_addr)) 148f19624aaSOr Gerlitz return -ENOMEM; 149f19624aaSOr Gerlitz 150f19624aaSOr Gerlitz tx_desc->dma_addr = dma_addr; 151f19624aaSOr Gerlitz tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 152f19624aaSOr Gerlitz tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 153f19624aaSOr Gerlitz tx_desc->tx_sg[0].lkey = device->mr->lkey; 154f19624aaSOr Gerlitz 155f19624aaSOr Gerlitz iser_task->iser_conn = iser_conn; 156f19624aaSOr Gerlitz return 0; 157f19624aaSOr Gerlitz } 15865e7ae7bSOr Gerlitz /** 1592261ec3dSMike Christie * iscsi_iser_task_init - Initialize task 1602261ec3dSMike Christie * @task: iscsi task 16165e7ae7bSOr Gerlitz * 1622261ec3dSMike Christie * Initialize the task for the scsi command or mgmt command. 1632747fdb2SMike Christie */ 164a8ac6311SOlaf Kirch static int 1652261ec3dSMike Christie iscsi_iser_task_init(struct iscsi_task *task) 16665e7ae7bSOr Gerlitz { 1672261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 16865e7ae7bSOr Gerlitz 169f19624aaSOr Gerlitz if (iser_initialize_task_headers(task, &iser_task->desc)) 170f19624aaSOr Gerlitz return -ENOMEM; 171f19624aaSOr Gerlitz 1722261ec3dSMike Christie /* mgmt task */ 173f19624aaSOr Gerlitz if (!task->sc) 1742747fdb2SMike Christie return 0; 1752747fdb2SMike Christie 1762261ec3dSMike Christie iser_task->command_sent = 0; 1772261ec3dSMike Christie iser_task_rdma_init(iser_task); 178a8ac6311SOlaf Kirch return 0; 17965e7ae7bSOr Gerlitz } 18065e7ae7bSOr Gerlitz 18165e7ae7bSOr Gerlitz /** 1822261ec3dSMike Christie * iscsi_iser_mtask_xmit - xmit management(immediate) task 18365e7ae7bSOr Gerlitz * @conn: iscsi connection 1842261ec3dSMike Christie * @task: task management task 18565e7ae7bSOr Gerlitz * 18665e7ae7bSOr Gerlitz * Notes: 18765e7ae7bSOr Gerlitz * The function can return -EAGAIN in which case caller must 18865e7ae7bSOr Gerlitz * call it again later, or recover. '0' return code means successful 18965e7ae7bSOr Gerlitz * xmit. 19065e7ae7bSOr Gerlitz * 19165e7ae7bSOr Gerlitz **/ 19265e7ae7bSOr Gerlitz static int 1932261ec3dSMike Christie iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 19465e7ae7bSOr Gerlitz { 19565e7ae7bSOr Gerlitz int error = 0; 19665e7ae7bSOr Gerlitz 197962b4b52SOr Gerlitz iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); 19865e7ae7bSOr Gerlitz 1992261ec3dSMike Christie error = iser_send_control(conn, task); 20065e7ae7bSOr Gerlitz 2012261ec3dSMike Christie /* since iser xmits control with zero copy, tasks can not be recycled 20265e7ae7bSOr Gerlitz * right after sending them. 20365e7ae7bSOr Gerlitz * The recycling scheme is based on whether a response is expected 2042261ec3dSMike Christie * - if yes, the task is recycled at iscsi_complete_pdu 2052261ec3dSMike Christie * - if no, the task is recycled at iser_snd_completion 20665e7ae7bSOr Gerlitz */ 20765e7ae7bSOr Gerlitz return error; 20865e7ae7bSOr Gerlitz } 20965e7ae7bSOr Gerlitz 21065e7ae7bSOr Gerlitz static int 2112747fdb2SMike Christie iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 2122261ec3dSMike Christie struct iscsi_task *task) 21365e7ae7bSOr Gerlitz { 2140f9c7449SMike Christie struct iscsi_r2t_info *r2t = &task->unsol_r2t; 21565e7ae7bSOr Gerlitz struct iscsi_data hdr; 21665e7ae7bSOr Gerlitz int error = 0; 21765e7ae7bSOr Gerlitz 21865e7ae7bSOr Gerlitz /* Send data-out PDUs while there's still unsolicited data to send */ 2190f9c7449SMike Christie while (iscsi_task_has_unsol_data(task)) { 2200f9c7449SMike Christie iscsi_prep_data_out_pdu(task, r2t, &hdr); 22148a237a2SMike Christie iser_dbg("Sending data-out: itt 0x%x, data count %d\n", 2220f9c7449SMike Christie hdr.itt, r2t->data_count); 22365e7ae7bSOr Gerlitz 22465e7ae7bSOr Gerlitz /* the buffer description has been passed with the command */ 22565e7ae7bSOr Gerlitz /* Send the command */ 2262261ec3dSMike Christie error = iser_send_data_out(conn, task, &hdr); 22765e7ae7bSOr Gerlitz if (error) { 2280f9c7449SMike Christie r2t->datasn--; 2292747fdb2SMike Christie goto iscsi_iser_task_xmit_unsol_data_exit; 23065e7ae7bSOr Gerlitz } 2310f9c7449SMike Christie r2t->sent += r2t->data_count; 23248a237a2SMike Christie iser_dbg("Need to send %d more as data-out PDUs\n", 2330f9c7449SMike Christie r2t->data_length - r2t->sent); 23465e7ae7bSOr Gerlitz } 23565e7ae7bSOr Gerlitz 2362747fdb2SMike Christie iscsi_iser_task_xmit_unsol_data_exit: 23765e7ae7bSOr Gerlitz return error; 23865e7ae7bSOr Gerlitz } 23965e7ae7bSOr Gerlitz 24065e7ae7bSOr Gerlitz static int 2412261ec3dSMike Christie iscsi_iser_task_xmit(struct iscsi_task *task) 24265e7ae7bSOr Gerlitz { 2432261ec3dSMike Christie struct iscsi_conn *conn = task->conn; 2442261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 24565e7ae7bSOr Gerlitz int error = 0; 24665e7ae7bSOr Gerlitz 2472261ec3dSMike Christie if (!task->sc) 2482261ec3dSMike Christie return iscsi_iser_mtask_xmit(conn, task); 2492747fdb2SMike Christie 2502261ec3dSMike Christie if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 2512261ec3dSMike Christie BUG_ON(scsi_bufflen(task->sc) == 0); 25277a23c21SMike Christie 25348a237a2SMike Christie iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", 2542261ec3dSMike Christie task->itt, scsi_bufflen(task->sc), 2550f9c7449SMike Christie task->imm_count, task->unsol_r2t.data_length); 25677a23c21SMike Christie } 25777a23c21SMike Christie 258962b4b52SOr Gerlitz iser_dbg("ctask xmit [cid %d itt 0x%x]\n", 2592261ec3dSMike Christie conn->id, task->itt); 26065e7ae7bSOr Gerlitz 26165e7ae7bSOr Gerlitz /* Send the cmd PDU */ 2622261ec3dSMike Christie if (!iser_task->command_sent) { 2632261ec3dSMike Christie error = iser_send_command(conn, task); 26465e7ae7bSOr Gerlitz if (error) 2652747fdb2SMike Christie goto iscsi_iser_task_xmit_exit; 2662261ec3dSMike Christie iser_task->command_sent = 1; 26765e7ae7bSOr Gerlitz } 26865e7ae7bSOr Gerlitz 26965e7ae7bSOr Gerlitz /* Send unsolicited data-out PDU(s) if necessary */ 2700f9c7449SMike Christie if (iscsi_task_has_unsol_data(task)) 2712261ec3dSMike Christie error = iscsi_iser_task_xmit_unsol_data(conn, task); 27265e7ae7bSOr Gerlitz 2732747fdb2SMike Christie iscsi_iser_task_xmit_exit: 27465e7ae7bSOr Gerlitz return error; 27565e7ae7bSOr Gerlitz } 27665e7ae7bSOr Gerlitz 2770f9c7449SMike Christie static void iscsi_iser_cleanup_task(struct iscsi_task *task) 27865e7ae7bSOr Gerlitz { 2792261ec3dSMike Christie struct iscsi_iser_task *iser_task = task->dd_data; 28052439540SOr Gerlitz struct iser_tx_desc *tx_desc = &iser_task->desc; 28152439540SOr Gerlitz 28252439540SOr Gerlitz struct iscsi_iser_conn *iser_conn = task->conn->dd_data; 28352439540SOr Gerlitz struct iser_device *device = iser_conn->ib_conn->device; 28452439540SOr Gerlitz 28552439540SOr Gerlitz ib_dma_unmap_single(device->ib_device, 28652439540SOr Gerlitz tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 28765e7ae7bSOr Gerlitz 288b3cd5050SMike Christie /* mgmt tasks do not need special cleanup */ 289b3cd5050SMike Christie if (!task->sc) 2902747fdb2SMike Christie return; 29165e7ae7bSOr Gerlitz 2922261ec3dSMike Christie if (iser_task->status == ISER_TASK_STATUS_STARTED) { 2932261ec3dSMike Christie iser_task->status = ISER_TASK_STATUS_COMPLETED; 2942261ec3dSMike Christie iser_task_rdma_finalize(iser_task); 29565e7ae7bSOr Gerlitz } 29665e7ae7bSOr Gerlitz } 29765e7ae7bSOr Gerlitz 29865e7ae7bSOr Gerlitz static struct iscsi_cls_conn * 29965e7ae7bSOr Gerlitz iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 30065e7ae7bSOr Gerlitz { 30165e7ae7bSOr Gerlitz struct iscsi_conn *conn; 30265e7ae7bSOr Gerlitz struct iscsi_cls_conn *cls_conn; 30365e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn; 30465e7ae7bSOr Gerlitz 3055d91e209SMike Christie cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); 30665e7ae7bSOr Gerlitz if (!cls_conn) 30765e7ae7bSOr Gerlitz return NULL; 30865e7ae7bSOr Gerlitz conn = cls_conn->dd_data; 30965e7ae7bSOr Gerlitz 31065e7ae7bSOr Gerlitz /* 31165e7ae7bSOr Gerlitz * due to issues with the login code re iser sematics 31265e7ae7bSOr Gerlitz * this not set in iscsi_conn_setup - FIXME 31365e7ae7bSOr Gerlitz */ 314bcc60c38SOr Gerlitz conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; 31565e7ae7bSOr Gerlitz 3165d91e209SMike Christie iser_conn = conn->dd_data; 31765e7ae7bSOr Gerlitz conn->dd_data = iser_conn; 31865e7ae7bSOr Gerlitz iser_conn->iscsi_conn = conn; 31965e7ae7bSOr Gerlitz 32065e7ae7bSOr Gerlitz return cls_conn; 32165e7ae7bSOr Gerlitz } 32265e7ae7bSOr Gerlitz 32365e7ae7bSOr Gerlitz static void 32465e7ae7bSOr Gerlitz iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) 32565e7ae7bSOr Gerlitz { 32665e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 32765e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn = conn->dd_data; 328b40977d9SMike Christie struct iser_conn *ib_conn = iser_conn->ib_conn; 32965e7ae7bSOr Gerlitz 33065e7ae7bSOr Gerlitz iscsi_conn_teardown(cls_conn); 331b40977d9SMike Christie /* 332b40977d9SMike Christie * Userspace will normally call the stop callback and 333b40977d9SMike Christie * already have freed the ib_conn, but if it goofed up then 334b40977d9SMike Christie * we free it here. 335b40977d9SMike Christie */ 336b40977d9SMike Christie if (ib_conn) { 337b40977d9SMike Christie ib_conn->iser_conn = NULL; 33839ff05dbSOr Gerlitz iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ 339b40977d9SMike Christie } 34065e7ae7bSOr Gerlitz } 34165e7ae7bSOr Gerlitz 34265e7ae7bSOr Gerlitz static int 34365e7ae7bSOr Gerlitz iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 34465e7ae7bSOr Gerlitz struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, 34565e7ae7bSOr Gerlitz int is_leading) 34665e7ae7bSOr Gerlitz { 34765e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 34865e7ae7bSOr Gerlitz struct iscsi_iser_conn *iser_conn; 34965e7ae7bSOr Gerlitz struct iser_conn *ib_conn; 350412eeafaSMike Christie struct iscsi_endpoint *ep; 35165e7ae7bSOr Gerlitz int error; 35265e7ae7bSOr Gerlitz 35365e7ae7bSOr Gerlitz error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 35465e7ae7bSOr Gerlitz if (error) 35565e7ae7bSOr Gerlitz return error; 35665e7ae7bSOr Gerlitz 35765e7ae7bSOr Gerlitz /* the transport ep handle comes from user space so it must be 35865e7ae7bSOr Gerlitz * verified against the global ib connections list */ 359412eeafaSMike Christie ep = iscsi_lookup_endpoint(transport_eph); 360412eeafaSMike Christie if (!ep) { 36165e7ae7bSOr Gerlitz iser_err("can't bind eph %llx\n", 36265e7ae7bSOr Gerlitz (unsigned long long)transport_eph); 36365e7ae7bSOr Gerlitz return -EINVAL; 36465e7ae7bSOr Gerlitz } 365412eeafaSMike Christie ib_conn = ep->dd_data; 366412eeafaSMike Christie 36789e984e2SOr Gerlitz if (iser_alloc_rx_descriptors(ib_conn)) 36889e984e2SOr Gerlitz return -ENOMEM; 36989e984e2SOr Gerlitz 37065e7ae7bSOr Gerlitz /* binds the iSER connection retrieved from the previously 37165e7ae7bSOr Gerlitz * connected ep_handle to the iSCSI layer connection. exchanges 37265e7ae7bSOr Gerlitz * connection pointers */ 3734f363882SRoi Dayan iser_info("binding iscsi/iser conn %p %p to ib_conn %p\n", 37439ff05dbSOr Gerlitz conn, conn->dd_data, ib_conn); 37565e7ae7bSOr Gerlitz iser_conn = conn->dd_data; 37665e7ae7bSOr Gerlitz ib_conn->iser_conn = iser_conn; 37765e7ae7bSOr Gerlitz iser_conn->ib_conn = ib_conn; 37839ff05dbSOr Gerlitz iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */ 37965e7ae7bSOr Gerlitz return 0; 38065e7ae7bSOr Gerlitz } 38165e7ae7bSOr Gerlitz 382b40977d9SMike Christie static void 383b40977d9SMike Christie iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 384b40977d9SMike Christie { 385b40977d9SMike Christie struct iscsi_conn *conn = cls_conn->dd_data; 386b40977d9SMike Christie struct iscsi_iser_conn *iser_conn = conn->dd_data; 387b40977d9SMike Christie struct iser_conn *ib_conn = iser_conn->ib_conn; 388b40977d9SMike Christie 389913e5bf4SMike Christie /* 390913e5bf4SMike Christie * Userspace may have goofed up and not bound the connection or 391913e5bf4SMike Christie * might have only partially setup the connection. 392913e5bf4SMike Christie */ 393913e5bf4SMike Christie if (ib_conn) { 394b40977d9SMike Christie iscsi_conn_stop(cls_conn, flag); 395b40977d9SMike Christie /* 396b40977d9SMike Christie * There is no unbind event so the stop callback 397b40977d9SMike Christie * must release the ref from the bind. 398b40977d9SMike Christie */ 39939ff05dbSOr Gerlitz iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ 400913e5bf4SMike Christie } 401b40977d9SMike Christie iser_conn->ib_conn = NULL; 402b40977d9SMike Christie } 403b40977d9SMike Christie 40475613521SMike Christie static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 40575613521SMike Christie { 40675613521SMike Christie struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 40775613521SMike Christie 408e5bd7b54SMike Christie iscsi_session_teardown(cls_session); 409a4804cd6SMike Christie iscsi_host_remove(shost); 410a4804cd6SMike Christie iscsi_host_free(shost); 41175613521SMike Christie } 41265e7ae7bSOr Gerlitz 41365e7ae7bSOr Gerlitz static struct iscsi_cls_session * 414412eeafaSMike Christie iscsi_iser_session_create(struct iscsi_endpoint *ep, 4151548271eSMike Christie uint16_t cmds_max, uint16_t qdepth, 4165e7facb7SMike Christie uint32_t initial_cmdsn) 41765e7ae7bSOr Gerlitz { 41865e7ae7bSOr Gerlitz struct iscsi_cls_session *cls_session; 41965e7ae7bSOr Gerlitz struct iscsi_session *session; 420412eeafaSMike Christie struct Scsi_Host *shost; 421412eeafaSMike Christie struct iser_conn *ib_conn; 42275613521SMike Christie 423962b4b52SOr Gerlitz shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); 42475613521SMike Christie if (!shost) 42575613521SMike Christie return NULL; 42675613521SMike Christie shost->transportt = iscsi_iser_scsi_transport; 42775613521SMike Christie shost->max_lun = iscsi_max_lun; 42875613521SMike Christie shost->max_id = 0; 42975613521SMike Christie shost->max_channel = 0; 43075613521SMike Christie shost->max_cmd_len = 16; 43175613521SMike Christie 432412eeafaSMike Christie /* 433412eeafaSMike Christie * older userspace tools (before 2.0-870) did not pass us 434412eeafaSMike Christie * the leading conn's ep so this will be NULL; 435412eeafaSMike Christie */ 436412eeafaSMike Christie if (ep) 437412eeafaSMike Christie ib_conn = ep->dd_data; 438412eeafaSMike Christie 439412eeafaSMike Christie if (iscsi_host_add(shost, 440412eeafaSMike Christie ep ? ib_conn->device->ib_device->dma_device : NULL)) 44175613521SMike Christie goto free_host; 44265e7ae7bSOr Gerlitz 4431548271eSMike Christie /* 4441548271eSMike Christie * we do not support setting can_queue cmd_per_lun from userspace yet 4451548271eSMike Christie * because we preallocate so many resources 4461548271eSMike Christie */ 44775613521SMike Christie cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 448b8b9e1b8SJayamohan Kallickal ISCSI_DEF_XMIT_CMDS_MAX, 0, 4492261ec3dSMike Christie sizeof(struct iscsi_iser_task), 4507970634bSMike Christie initial_cmdsn, 0); 45165e7ae7bSOr Gerlitz if (!cls_session) 45275613521SMike Christie goto remove_host; 45375613521SMike Christie session = cls_session->dd_data; 45465e7ae7bSOr Gerlitz 4552747fdb2SMike Christie shost->can_queue = session->scsi_cmds_max; 45665e7ae7bSOr Gerlitz return cls_session; 45775613521SMike Christie 45875613521SMike Christie remove_host: 459a4804cd6SMike Christie iscsi_host_remove(shost); 46075613521SMike Christie free_host: 461a4804cd6SMike Christie iscsi_host_free(shost); 46275613521SMike Christie return NULL; 46365e7ae7bSOr Gerlitz } 46465e7ae7bSOr Gerlitz 46565e7ae7bSOr Gerlitz static int 466358ff019SMike Christie iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 467358ff019SMike Christie enum iscsi_param param, char *buf, int buflen) 46865e7ae7bSOr Gerlitz { 469358ff019SMike Christie int value; 47065e7ae7bSOr Gerlitz 47165e7ae7bSOr Gerlitz switch (param) { 47265e7ae7bSOr Gerlitz case ISCSI_PARAM_MAX_RECV_DLENGTH: 47365e7ae7bSOr Gerlitz /* TBD */ 47465e7ae7bSOr Gerlitz break; 47565e7ae7bSOr Gerlitz case ISCSI_PARAM_HDRDGST_EN: 476358ff019SMike Christie sscanf(buf, "%d", &value); 47765e7ae7bSOr Gerlitz if (value) { 4784f363882SRoi Dayan iser_err("DataDigest wasn't negotiated to None"); 47965e7ae7bSOr Gerlitz return -EPROTO; 48065e7ae7bSOr Gerlitz } 48165e7ae7bSOr Gerlitz break; 48265e7ae7bSOr Gerlitz case ISCSI_PARAM_DATADGST_EN: 483358ff019SMike Christie sscanf(buf, "%d", &value); 48465e7ae7bSOr Gerlitz if (value) { 4854f363882SRoi Dayan iser_err("DataDigest wasn't negotiated to None"); 48665e7ae7bSOr Gerlitz return -EPROTO; 48765e7ae7bSOr Gerlitz } 48865e7ae7bSOr Gerlitz break; 48965e7ae7bSOr Gerlitz case ISCSI_PARAM_IFMARKER_EN: 490358ff019SMike Christie sscanf(buf, "%d", &value); 49165e7ae7bSOr Gerlitz if (value) { 4924f363882SRoi Dayan iser_err("IFMarker wasn't negotiated to No"); 49365e7ae7bSOr Gerlitz return -EPROTO; 49465e7ae7bSOr Gerlitz } 49565e7ae7bSOr Gerlitz break; 49665e7ae7bSOr Gerlitz case ISCSI_PARAM_OFMARKER_EN: 497358ff019SMike Christie sscanf(buf, "%d", &value); 49865e7ae7bSOr Gerlitz if (value) { 4994f363882SRoi Dayan iser_err("OFMarker wasn't negotiated to No"); 50065e7ae7bSOr Gerlitz return -EPROTO; 50165e7ae7bSOr Gerlitz } 50265e7ae7bSOr Gerlitz break; 50365e7ae7bSOr Gerlitz default: 504358ff019SMike Christie return iscsi_set_param(cls_conn, param, buf, buflen); 50565e7ae7bSOr Gerlitz } 50665e7ae7bSOr Gerlitz 50765e7ae7bSOr Gerlitz return 0; 50865e7ae7bSOr Gerlitz } 50965e7ae7bSOr Gerlitz 51065e7ae7bSOr Gerlitz static void 51165e7ae7bSOr Gerlitz iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 51265e7ae7bSOr Gerlitz { 51365e7ae7bSOr Gerlitz struct iscsi_conn *conn = cls_conn->dd_data; 51465e7ae7bSOr Gerlitz 51565e7ae7bSOr Gerlitz stats->txdata_octets = conn->txdata_octets; 51665e7ae7bSOr Gerlitz stats->rxdata_octets = conn->rxdata_octets; 51765e7ae7bSOr Gerlitz stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 51865e7ae7bSOr Gerlitz stats->dataout_pdus = conn->dataout_pdus_cnt; 51965e7ae7bSOr Gerlitz stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 52065e7ae7bSOr Gerlitz stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 52165e7ae7bSOr Gerlitz stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 52265e7ae7bSOr Gerlitz stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 52365e7ae7bSOr Gerlitz stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 52487528227SEli Dorfman stats->custom_length = 4; 52565e7ae7bSOr Gerlitz strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 52665e7ae7bSOr Gerlitz stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 52765e7ae7bSOr Gerlitz strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 52865e7ae7bSOr Gerlitz stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 52965e7ae7bSOr Gerlitz strcpy(stats->custom[2].desc, "eh_abort_cnt"); 53065e7ae7bSOr Gerlitz stats->custom[2].value = conn->eh_abort_cnt; 53187528227SEli Dorfman strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 53287528227SEli Dorfman stats->custom[3].value = conn->fmr_unalign_cnt; 53365e7ae7bSOr Gerlitz } 53465e7ae7bSOr Gerlitz 5357c53c6f8SMike Christie static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, 5367c53c6f8SMike Christie enum iscsi_param param, char *buf) 5377c53c6f8SMike Christie { 5387c53c6f8SMike Christie struct iser_conn *ib_conn = ep->dd_data; 5397c53c6f8SMike Christie int len; 5407c53c6f8SMike Christie 5417c53c6f8SMike Christie switch (param) { 5427c53c6f8SMike Christie case ISCSI_PARAM_CONN_PORT: 5437c53c6f8SMike Christie case ISCSI_PARAM_CONN_ADDRESS: 5447c53c6f8SMike Christie if (!ib_conn || !ib_conn->cma_id) 5457c53c6f8SMike Christie return -ENOTCONN; 5467c53c6f8SMike Christie 5477c53c6f8SMike Christie return iscsi_conn_get_addr_param((struct sockaddr_storage *) 5487c53c6f8SMike Christie &ib_conn->cma_id->route.addr.dst_addr, 5497c53c6f8SMike Christie param, buf); 5507c53c6f8SMike Christie break; 5517c53c6f8SMike Christie default: 5527c53c6f8SMike Christie return -ENOSYS; 5537c53c6f8SMike Christie } 5547c53c6f8SMike Christie 5557c53c6f8SMike Christie return len; 5567c53c6f8SMike Christie } 5577c53c6f8SMike Christie 558412eeafaSMike Christie static struct iscsi_endpoint * 55910eb0f01SMike Christie iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, 56010eb0f01SMike Christie int non_blocking) 56165e7ae7bSOr Gerlitz { 56265e7ae7bSOr Gerlitz int err; 56365e7ae7bSOr Gerlitz struct iser_conn *ib_conn; 564412eeafaSMike Christie struct iscsi_endpoint *ep; 56565e7ae7bSOr Gerlitz 566412eeafaSMike Christie ep = iscsi_create_endpoint(sizeof(*ib_conn)); 567412eeafaSMike Christie if (!ep) 568412eeafaSMike Christie return ERR_PTR(-ENOMEM); 56965e7ae7bSOr Gerlitz 570412eeafaSMike Christie ib_conn = ep->dd_data; 571412eeafaSMike Christie ib_conn->ep = ep; 572412eeafaSMike Christie iser_conn_init(ib_conn); 57365e7ae7bSOr Gerlitz 574412eeafaSMike Christie err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, 575412eeafaSMike Christie non_blocking); 5767d9c0de4SOr Gerlitz if (err) 577412eeafaSMike Christie return ERR_PTR(err); 5787d9c0de4SOr Gerlitz 579412eeafaSMike Christie return ep; 58065e7ae7bSOr Gerlitz } 58165e7ae7bSOr Gerlitz 58265e7ae7bSOr Gerlitz static int 583412eeafaSMike Christie iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 58465e7ae7bSOr Gerlitz { 585412eeafaSMike Christie struct iser_conn *ib_conn; 58665e7ae7bSOr Gerlitz int rc; 58765e7ae7bSOr Gerlitz 588412eeafaSMike Christie ib_conn = ep->dd_data; 58965e7ae7bSOr Gerlitz rc = wait_event_interruptible_timeout(ib_conn->wait, 59065e7ae7bSOr Gerlitz ib_conn->state == ISER_CONN_UP, 59165e7ae7bSOr Gerlitz msecs_to_jiffies(timeout_ms)); 59265e7ae7bSOr Gerlitz 59365e7ae7bSOr Gerlitz /* if conn establishment failed, return error code to iscsi */ 59465e7ae7bSOr Gerlitz if (!rc && 59565e7ae7bSOr Gerlitz (ib_conn->state == ISER_CONN_TERMINATING || 59665e7ae7bSOr Gerlitz ib_conn->state == ISER_CONN_DOWN)) 59765e7ae7bSOr Gerlitz rc = -1; 59865e7ae7bSOr Gerlitz 5994f363882SRoi Dayan iser_info("ib conn %p rc = %d\n", ib_conn, rc); 60065e7ae7bSOr Gerlitz 60165e7ae7bSOr Gerlitz if (rc > 0) 60265e7ae7bSOr Gerlitz return 1; /* success, this is the equivalent of POLLOUT */ 60365e7ae7bSOr Gerlitz else if (!rc) 60465e7ae7bSOr Gerlitz return 0; /* timeout */ 60565e7ae7bSOr Gerlitz else 60665e7ae7bSOr Gerlitz return rc; /* signal */ 60765e7ae7bSOr Gerlitz } 60865e7ae7bSOr Gerlitz 60965e7ae7bSOr Gerlitz static void 610412eeafaSMike Christie iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 61165e7ae7bSOr Gerlitz { 6121c83469dSMike Christie struct iser_conn *ib_conn; 61365e7ae7bSOr Gerlitz 614412eeafaSMike Christie ib_conn = ep->dd_data; 615b40977d9SMike Christie if (ib_conn->iser_conn) 616b40977d9SMike Christie /* 617b40977d9SMike Christie * Must suspend xmit path if the ep is bound to the 618b40977d9SMike Christie * iscsi_conn, so we know we are not accessing the ib_conn 619b40977d9SMike Christie * when we free it. 620b40977d9SMike Christie * 621b40977d9SMike Christie * This may not be bound if the ep poll failed. 622b40977d9SMike Christie */ 623b40977d9SMike Christie iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); 624b40977d9SMike Christie 62565e7ae7bSOr Gerlitz 6264f363882SRoi Dayan iser_info("ib conn %p state %d\n", ib_conn, ib_conn->state); 62765e7ae7bSOr Gerlitz iser_conn_terminate(ib_conn); 62865e7ae7bSOr Gerlitz } 62965e7ae7bSOr Gerlitz 630587a1f16SAl Viro static umode_t iser_attr_is_visible(int param_type, int param) 6313128c6c7SMike Christie { 6323128c6c7SMike Christie switch (param_type) { 633f27fb2efSMike Christie case ISCSI_HOST_PARAM: 634f27fb2efSMike Christie switch (param) { 635f27fb2efSMike Christie case ISCSI_HOST_PARAM_NETDEV_NAME: 636f27fb2efSMike Christie case ISCSI_HOST_PARAM_HWADDRESS: 637f27fb2efSMike Christie case ISCSI_HOST_PARAM_INITIATOR_NAME: 638f27fb2efSMike Christie return S_IRUGO; 639f27fb2efSMike Christie default: 640f27fb2efSMike Christie return 0; 641f27fb2efSMike Christie } 6423128c6c7SMike Christie case ISCSI_PARAM: 6433128c6c7SMike Christie switch (param) { 6443128c6c7SMike Christie case ISCSI_PARAM_MAX_RECV_DLENGTH: 6453128c6c7SMike Christie case ISCSI_PARAM_MAX_XMIT_DLENGTH: 6463128c6c7SMike Christie case ISCSI_PARAM_HDRDGST_EN: 6473128c6c7SMike Christie case ISCSI_PARAM_DATADGST_EN: 6483128c6c7SMike Christie case ISCSI_PARAM_CONN_ADDRESS: 6493128c6c7SMike Christie case ISCSI_PARAM_CONN_PORT: 6503128c6c7SMike Christie case ISCSI_PARAM_EXP_STATSN: 6513128c6c7SMike Christie case ISCSI_PARAM_PERSISTENT_ADDRESS: 6523128c6c7SMike Christie case ISCSI_PARAM_PERSISTENT_PORT: 6533128c6c7SMike Christie case ISCSI_PARAM_PING_TMO: 6543128c6c7SMike Christie case ISCSI_PARAM_RECV_TMO: 6551d063c17SMike Christie case ISCSI_PARAM_INITIAL_R2T_EN: 6561d063c17SMike Christie case ISCSI_PARAM_MAX_R2T: 6571d063c17SMike Christie case ISCSI_PARAM_IMM_DATA_EN: 6581d063c17SMike Christie case ISCSI_PARAM_FIRST_BURST: 6591d063c17SMike Christie case ISCSI_PARAM_MAX_BURST: 6601d063c17SMike Christie case ISCSI_PARAM_PDU_INORDER_EN: 6611d063c17SMike Christie case ISCSI_PARAM_DATASEQ_INORDER_EN: 6621d063c17SMike Christie case ISCSI_PARAM_TARGET_NAME: 6631d063c17SMike Christie case ISCSI_PARAM_TPGT: 6641d063c17SMike Christie case ISCSI_PARAM_USERNAME: 6651d063c17SMike Christie case ISCSI_PARAM_PASSWORD: 6661d063c17SMike Christie case ISCSI_PARAM_USERNAME_IN: 6671d063c17SMike Christie case ISCSI_PARAM_PASSWORD_IN: 6681d063c17SMike Christie case ISCSI_PARAM_FAST_ABORT: 6691d063c17SMike Christie case ISCSI_PARAM_ABORT_TMO: 6701d063c17SMike Christie case ISCSI_PARAM_LU_RESET_TMO: 6711d063c17SMike Christie case ISCSI_PARAM_TGT_RESET_TMO: 6721d063c17SMike Christie case ISCSI_PARAM_IFACE_NAME: 6731d063c17SMike Christie case ISCSI_PARAM_INITIATOR_NAME: 6743128c6c7SMike Christie return S_IRUGO; 6753128c6c7SMike Christie default: 6763128c6c7SMike Christie return 0; 6773128c6c7SMike Christie } 6783128c6c7SMike Christie } 6793128c6c7SMike Christie 6803128c6c7SMike Christie return 0; 6813128c6c7SMike Christie } 6823128c6c7SMike Christie 68365e7ae7bSOr Gerlitz static struct scsi_host_template iscsi_iser_sht = { 6847974392cSMike Christie .module = THIS_MODULE, 685c1d786e6SRoi Dayan .name = "iSCSI Initiator over iSER", 68665e7ae7bSOr Gerlitz .queuecommand = iscsi_queuecommand, 6876410627eSErez Zilber .change_queue_depth = iscsi_change_queue_depth, 68865e7ae7bSOr Gerlitz .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 6898072ec2fSErez Zilber .max_sectors = 1024, 690e28f3d5bSMike Christie .cmd_per_lun = ISER_DEF_CMD_PER_LUN, 69165e7ae7bSOr Gerlitz .eh_abort_handler = iscsi_eh_abort, 69290c18f3cSErez Zilber .eh_device_reset_handler= iscsi_eh_device_reset, 693309ce156SJayamohan Kallickal .eh_target_reset_handler = iscsi_eh_recover_target, 6946b5d6c44SMike Christie .target_alloc = iscsi_target_alloc, 69565e7ae7bSOr Gerlitz .use_clustering = DISABLE_CLUSTERING, 69665e7ae7bSOr Gerlitz .proc_name = "iscsi_iser", 69765e7ae7bSOr Gerlitz .this_id = -1, 69865e7ae7bSOr Gerlitz }; 69965e7ae7bSOr Gerlitz 70065e7ae7bSOr Gerlitz static struct iscsi_transport iscsi_iser_transport = { 70165e7ae7bSOr Gerlitz .owner = THIS_MODULE, 70265e7ae7bSOr Gerlitz .name = "iser", 70365e7ae7bSOr Gerlitz .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, 70465e7ae7bSOr Gerlitz /* session management */ 70565e7ae7bSOr Gerlitz .create_session = iscsi_iser_session_create, 70675613521SMike Christie .destroy_session = iscsi_iser_session_destroy, 70765e7ae7bSOr Gerlitz /* connection management */ 70865e7ae7bSOr Gerlitz .create_conn = iscsi_iser_conn_create, 70965e7ae7bSOr Gerlitz .bind_conn = iscsi_iser_conn_bind, 71065e7ae7bSOr Gerlitz .destroy_conn = iscsi_iser_conn_destroy, 7113128c6c7SMike Christie .attr_is_visible = iser_attr_is_visible, 712358ff019SMike Christie .set_param = iscsi_iser_set_param, 713358ff019SMike Christie .get_conn_param = iscsi_conn_get_param, 7147c53c6f8SMike Christie .get_ep_param = iscsi_iser_get_ep_param, 715358ff019SMike Christie .get_session_param = iscsi_session_get_param, 71689e984e2SOr Gerlitz .start_conn = iscsi_conn_start, 717b40977d9SMike Christie .stop_conn = iscsi_iser_conn_stop, 7180801c242SMike Christie /* iscsi host params */ 7190801c242SMike Christie .get_host_param = iscsi_host_get_param, 7200801c242SMike Christie .set_host_param = iscsi_host_set_param, 72165e7ae7bSOr Gerlitz /* IO */ 72265e7ae7bSOr Gerlitz .send_pdu = iscsi_conn_send_pdu, 72365e7ae7bSOr Gerlitz .get_stats = iscsi_iser_conn_get_stats, 7242747fdb2SMike Christie .init_task = iscsi_iser_task_init, 7252747fdb2SMike Christie .xmit_task = iscsi_iser_task_xmit, 7262747fdb2SMike Christie .cleanup_task = iscsi_iser_cleanup_task, 7270f9c7449SMike Christie .alloc_pdu = iscsi_iser_pdu_alloc, 72865e7ae7bSOr Gerlitz /* recovery */ 72965e7ae7bSOr Gerlitz .session_recovery_timedout = iscsi_session_recovery_timedout, 73065e7ae7bSOr Gerlitz 73165e7ae7bSOr Gerlitz .ep_connect = iscsi_iser_ep_connect, 73265e7ae7bSOr Gerlitz .ep_poll = iscsi_iser_ep_poll, 73365e7ae7bSOr Gerlitz .ep_disconnect = iscsi_iser_ep_disconnect 73465e7ae7bSOr Gerlitz }; 73565e7ae7bSOr Gerlitz 73665e7ae7bSOr Gerlitz static int __init iser_init(void) 73765e7ae7bSOr Gerlitz { 73865e7ae7bSOr Gerlitz int err; 73965e7ae7bSOr Gerlitz 74065e7ae7bSOr Gerlitz iser_dbg("Starting iSER datamover...\n"); 74165e7ae7bSOr Gerlitz 74265e7ae7bSOr Gerlitz if (iscsi_max_lun < 1) { 7434f363882SRoi Dayan iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); 74465e7ae7bSOr Gerlitz return -EINVAL; 74565e7ae7bSOr Gerlitz } 74665e7ae7bSOr Gerlitz 74765e7ae7bSOr Gerlitz memset(&ig, 0, sizeof(struct iser_global)); 74865e7ae7bSOr Gerlitz 74965e7ae7bSOr Gerlitz ig.desc_cache = kmem_cache_create("iser_descriptors", 750f19624aaSOr Gerlitz sizeof(struct iser_tx_desc), 75165e7ae7bSOr Gerlitz 0, SLAB_HWCACHE_ALIGN, 75220c2df83SPaul Mundt NULL); 75365e7ae7bSOr Gerlitz if (ig.desc_cache == NULL) 75465e7ae7bSOr Gerlitz return -ENOMEM; 75565e7ae7bSOr Gerlitz 75665e7ae7bSOr Gerlitz /* device init is called only after the first addr resolution */ 75765e7ae7bSOr Gerlitz mutex_init(&ig.device_list_mutex); 75865e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.device_list); 75965e7ae7bSOr Gerlitz mutex_init(&ig.connlist_mutex); 76065e7ae7bSOr Gerlitz INIT_LIST_HEAD(&ig.connlist); 76165e7ae7bSOr Gerlitz 76275613521SMike Christie iscsi_iser_scsi_transport = iscsi_register_transport( 76375613521SMike Christie &iscsi_iser_transport); 76475613521SMike Christie if (!iscsi_iser_scsi_transport) { 76565e7ae7bSOr Gerlitz iser_err("iscsi_register_transport failed\n"); 76665e7ae7bSOr Gerlitz err = -EINVAL; 76765e7ae7bSOr Gerlitz goto register_transport_failure; 76865e7ae7bSOr Gerlitz } 76965e7ae7bSOr Gerlitz 77065e7ae7bSOr Gerlitz return 0; 77165e7ae7bSOr Gerlitz 77265e7ae7bSOr Gerlitz register_transport_failure: 77365e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 77465e7ae7bSOr Gerlitz 77565e7ae7bSOr Gerlitz return err; 77665e7ae7bSOr Gerlitz } 77765e7ae7bSOr Gerlitz 77865e7ae7bSOr Gerlitz static void __exit iser_exit(void) 77965e7ae7bSOr Gerlitz { 78065e7ae7bSOr Gerlitz iser_dbg("Removing iSER datamover...\n"); 78165e7ae7bSOr Gerlitz iscsi_unregister_transport(&iscsi_iser_transport); 78265e7ae7bSOr Gerlitz kmem_cache_destroy(ig.desc_cache); 78365e7ae7bSOr Gerlitz } 78465e7ae7bSOr Gerlitz 78565e7ae7bSOr Gerlitz module_init(iser_init); 78665e7ae7bSOr Gerlitz module_exit(iser_exit); 787