| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Or Gerlitz | 1535 | 41.93% | 11 | 9.82% |
| Michael Christie | 839 | 22.92% | 29 | 25.89% |
| Sagi Grimberg | 446 | 12.18% | 19 | 16.96% |
| Ariel Nahum | 380 | 10.38% | 8 | 7.14% |
| Max Gurtovoy | 159 | 4.34% | 7 | 6.25% |
| Christoph Hellwig | 68 | 1.86% | 5 | 4.46% |
| Jenny Derzhavetz (Jenny Falkovich) | 54 | 1.48% | 1 | 0.89% |
| Roi Dayan | 26 | 0.71% | 4 | 3.57% |
| Israel Rukshin | 23 | 0.63% | 2 | 1.79% |
| Alex Tabachnik | 21 | 0.57% | 1 | 0.89% |
| Vladimir Neyelov | 18 | 0.49% | 1 | 0.89% |
| Sergey Gorenko | 17 | 0.46% | 1 | 0.89% |
| Shlomo Pongratz | 14 | 0.38% | 1 | 0.89% |
| Bart Van Assche | 12 | 0.33% | 2 | 1.79% |
| Erez Zilber | 9 | 0.25% | 2 | 1.79% |
| FUJITA Tomonori | 6 | 0.16% | 1 | 0.89% |
| Sebastian Andrzej Siewior | 5 | 0.14% | 1 | 0.89% |
| Minh Duc Tran | 4 | 0.11% | 1 | 0.89% |
| Jason Gunthorpe | 4 | 0.11% | 2 | 1.79% |
| Tejun Heo | 3 | 0.08% | 1 | 0.89% |
| Jayamohan Kallickal | 3 | 0.08% | 2 | 1.79% |
| Paul Gortmaker | 3 | 0.08% | 1 | 0.89% |
| Olaf Kirch | 3 | 0.08% | 1 | 0.89% |
| Colin Ian King | 2 | 0.05% | 1 | 0.89% |
| Linus Torvalds | 2 | 0.05% | 2 | 1.79% |
| Geliang Tang | 1 | 0.03% | 1 | 0.89% |
| Eli Dorfman | 1 | 0.03% | 1 | 0.89% |
| Randy Dunlap | 1 | 0.03% | 1 | 0.89% |
| Al Viro | 1 | 0.03% | 1 | 0.89% |
| Mauro Carvalho Chehab | 1 | 0.03% | 1 | 0.89% |
| Total | 3661 | 112 |
/* * iSCSI Initiator over iSER Data-Path * * Copyright (C) 2004 Dmitry Yusupov * Copyright (C) 2004 Alex Aizman * Copyright (C) 2005 Mike Christie * Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved. * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved. * maintained by openib-general@openib.org * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * * Credits: * Christoph Hellwig * FUJITA Tomonori * Arne Redlich * Zhenyu Wang * Modified by: * Erez Zilber */ #include <linux/types.h> #include <linux/list.h> #include <linux/hardirq.h> #include <linux/kfifo.h> #include <linux/blkdev.h> #include <linux/init.h> #include <linux/ioctl.h> #include <linux/cdev.h> #include <linux/in.h> #include <linux/net.h> #include <linux/scatterlist.h> #include <linux/delay.h> #include <linux/slab.h> #include <linux/module.h> #include <net/sock.h> #include <linux/uaccess.h> #include <scsi/scsi_cmnd.h> #include <scsi/scsi_device.h> #include <scsi/scsi_eh.h> #include <scsi/scsi_tcq.h> #include <scsi/scsi_host.h> #include <scsi/scsi.h> #include <scsi/scsi_transport_iscsi.h> #include "iscsi_iser.h" MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover"); MODULE_LICENSE("Dual BSD/GPL"); MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); static struct scsi_host_template iscsi_iser_sht; static struct iscsi_transport iscsi_iser_transport; static struct scsi_transport_template *iscsi_iser_scsi_transport; static struct workqueue_struct *release_wq; static DEFINE_MUTEX(unbind_iser_conn_mutex); struct iser_global ig; int iser_debug_level = 0; module_param_named(debug_level, iser_debug_level, int, S_IRUGO | S_IWUSR); MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); static int iscsi_iser_set(const char *val, const struct kernel_param *kp); static const struct kernel_param_ops iscsi_iser_size_ops = { .set = iscsi_iser_set, .get = param_get_uint, }; static unsigned int iscsi_max_lun = 512; module_param_cb(max_lun, &iscsi_iser_size_ops, &iscsi_max_lun, S_IRUGO); MODULE_PARM_DESC(max_lun, "Max LUNs to allow per session, should > 0 (default:512)"); unsigned int iser_max_sectors = ISER_DEF_MAX_SECTORS; module_param_cb(max_sectors, &iscsi_iser_size_ops, &iser_max_sectors, S_IRUGO | S_IWUSR); MODULE_PARM_DESC(max_sectors, "Max number of sectors in a single scsi command, should > 0 (default:1024)"); bool iser_always_reg = true; module_param_named(always_register, iser_always_reg, bool, S_IRUGO); MODULE_PARM_DESC(always_register, "Always register memory, even for continuous memory regions (default:true)"); bool iser_pi_enable = false; module_param_named(pi_enable, iser_pi_enable, bool, S_IRUGO); MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)"); static int iscsi_iser_set(const char *val, const struct kernel_param *kp) { int ret; unsigned int n = 0; ret = kstrtouint(val, 10, &n); if (ret != 0 || n == 0) return -EINVAL; return param_set_uint(val, kp); } /* * iscsi_iser_recv() - Process a successful recv completion * @conn: iscsi connection * @hdr: iscsi header * @rx_data: buffer containing receive data payload * @rx_data_len: length of rx_data * * Notes: In case of data length errors or iscsi PDU completion failures * this routine will signal iscsi layer of connection failure. */ void iscsi_iser_recv(struct iscsi_conn *conn, struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) { int rc = 0; int datalen; /* verify PDU length */ datalen = ntoh24(hdr->dlength); if (datalen > rx_data_len || (datalen + 4) < rx_data_len) { iser_err("wrong datalen %d (hdr), %d (IB)\n", datalen, rx_data_len); rc = ISCSI_ERR_DATALEN; goto error; } if (datalen != rx_data_len) iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", datalen, rx_data_len); rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) goto error; return; error: iscsi_conn_failure(conn, rc); } /** * iscsi_iser_pdu_alloc() - allocate an iscsi-iser PDU * @task: iscsi task * @opcode: iscsi command opcode * * Netes: This routine can't fail, just assign iscsi task * hdr and max hdr size. */ static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) { struct iscsi_iser_task *iser_task = task->dd_data; task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; task->hdr_max = sizeof(iser_task->desc.iscsi_header); return 0; } /** * iser_initialize_task_headers() - Initialize task headers * @task: iscsi task * @tx_desc: iser tx descriptor * * Notes: * This routine may race with iser teardown flow for scsi * error handling TMFs. So for TMF we should acquire the * state mutex to avoid dereferencing the IB device which * may have already been terminated. */ int iser_initialize_task_headers(struct iscsi_task *task, struct iser_tx_desc *tx_desc) { struct iser_conn *iser_conn = task->conn->dd_data; struct iser_device *device = iser_conn->ib_conn.device; struct iscsi_iser_task *iser_task = task->dd_data; u64 dma_addr; if (unlikely(iser_conn->state != ISER_CONN_UP)) return -ENODEV; dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, ISER_HEADERS_LEN, DMA_TO_DEVICE); if (ib_dma_mapping_error(device->ib_device, dma_addr)) return -ENOMEM; tx_desc->inv_wr.next = NULL; tx_desc->reg_wr.wr.next = NULL; tx_desc->mapped = true; tx_desc->dma_addr = dma_addr; tx_desc->tx_sg[0].addr = tx_desc->dma_addr; tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey; iser_task->iser_conn = iser_conn; return 0; } /** * iscsi_iser_task_init() - Initialize iscsi-iser task * @task: iscsi task * * Initialize the task for the scsi command or mgmt command. * * Return: Returns zero on success or -ENOMEM when failing * to init task headers (dma mapping error). */ static int iscsi_iser_task_init(struct iscsi_task *task) { struct iscsi_iser_task *iser_task = task->dd_data; int ret; ret = iser_initialize_task_headers(task, &iser_task->desc); if (ret) { iser_err("Failed to init task %p, err = %d\n", iser_task, ret); return ret; } /* mgmt task */ if (!task->sc) return 0; iser_task->command_sent = 0; iser_task_rdma_init(iser_task); iser_task->sc = task->sc; return 0; } /** * iscsi_iser_mtask_xmit() - xmit management (immediate) task * @conn: iscsi connection * @task: task management task * * Notes: * The function can return -EAGAIN in which case caller must * call it again later, or recover. '0' return code means successful * xmit. * **/ static int iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) { int error = 0; iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); error = iser_send_control(conn, task); /* since iser xmits control with zero copy, tasks can not be recycled * right after sending them. * The recycling scheme is based on whether a response is expected * - if yes, the task is recycled at iscsi_complete_pdu * - if no, the task is recycled at iser_snd_completion */ return error; } static int iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, struct iscsi_task *task) { struct iscsi_r2t_info *r2t = &task->unsol_r2t; struct iscsi_data hdr; int error = 0; /* Send data-out PDUs while there's still unsolicited data to send */ while (iscsi_task_has_unsol_data(task)) { iscsi_prep_data_out_pdu(task, r2t, &hdr); iser_dbg("Sending data-out: itt 0x%x, data count %d\n", hdr.itt, r2t->data_count); /* the buffer description has been passed with the command */ /* Send the command */ error = iser_send_data_out(conn, task, &hdr); if (error) { r2t->datasn--; goto iscsi_iser_task_xmit_unsol_data_exit; } r2t->sent += r2t->data_count; iser_dbg("Need to send %d more as data-out PDUs\n", r2t->data_length - r2t->sent); } iscsi_iser_task_xmit_unsol_data_exit: return error; } /** * iscsi_iser_task_xmit() - xmit iscsi-iser task * @task: iscsi task * * Return: zero on success or escalates $error on failure. */ static int iscsi_iser_task_xmit(struct iscsi_task *task) { struct iscsi_conn *conn = task->conn; struct iscsi_iser_task *iser_task = task->dd_data; int error = 0; if (!task->sc) return iscsi_iser_mtask_xmit(conn, task); if (task->sc->sc_data_direction == DMA_TO_DEVICE) { BUG_ON(scsi_bufflen(task->sc) == 0); iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", task->itt, scsi_bufflen(task->sc), task->imm_count, task->unsol_r2t.data_length); } iser_dbg("ctask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); /* Send the cmd PDU */ if (!iser_task->command_sent) { error = iser_send_command(conn, task); if (error) goto iscsi_iser_task_xmit_exit; iser_task->command_sent = 1; } /* Send unsolicited data-out PDU(s) if necessary */ if (iscsi_task_has_unsol_data(task)) error = iscsi_iser_task_xmit_unsol_data(conn, task); iscsi_iser_task_xmit_exit: return error; } /** * iscsi_iser_cleanup_task() - cleanup an iscsi-iser task * @task: iscsi task * * Notes: In case the RDMA device is already NULL (might have * been removed in DEVICE_REMOVAL CM event it will bail-out * without doing dma unmapping. */ static void iscsi_iser_cleanup_task(struct iscsi_task *task) { struct iscsi_iser_task *iser_task = task->dd_data; struct iser_tx_desc *tx_desc = &iser_task->desc; struct iser_conn *iser_conn = task->conn->dd_data; struct iser_device *device = iser_conn->ib_conn.device; /* DEVICE_REMOVAL event might have already released the device */ if (!device) return; if (likely(tx_desc->mapped)) { ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); tx_desc->mapped = false; } /* mgmt tasks do not need special cleanup */ if (!task->sc) return; if (iser_task->status == ISER_TASK_STATUS_STARTED) { iser_task->status = ISER_TASK_STATUS_COMPLETED; iser_task_rdma_finalize(iser_task); } } /** * iscsi_iser_check_protection() - check protection information status of task. * @task: iscsi task * @sector: error sector if exsists (output) * * Return: zero if no data-integrity errors have occured * 0x1: data-integrity error occured in the guard-block * 0x2: data-integrity error occured in the reference tag * 0x3: data-integrity error occured in the application tag * * In addition the error sector is marked. */ static u8 iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector) { struct iscsi_iser_task *iser_task = task->dd_data; enum iser_data_dir dir = iser_task->dir[ISER_DIR_IN] ? ISER_DIR_IN : ISER_DIR_OUT; return iser_check_task_pi_status(iser_task, dir, sector); } /** * iscsi_iser_conn_create() - create a new iscsi-iser connection * @cls_session: iscsi class connection * @conn_idx: connection index within the session (for MCS) * * Return: iscsi_cls_conn when iscsi_conn_setup succeeds or NULL * otherwise. */ static struct iscsi_cls_conn * iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) { struct iscsi_conn *conn; struct iscsi_cls_conn *cls_conn; cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx); if (!cls_conn) return NULL; conn = cls_conn->dd_data; /* * due to issues with the login code re iser sematics * this not set in iscsi_conn_setup - FIXME */ conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; return cls_conn; } /** * iscsi_iser_conn_bind() - bind iscsi and iser connection structures * @cls_session: iscsi class session * @cls_conn: iscsi class connection * @transport_eph: transport end-point handle * @is_leading: indicate if this is the session leading connection (MCS) * * Return: zero on success, $error if iscsi_conn_bind fails and * -EINVAL in case end-point doesn't exsits anymore or iser connection * state is not UP (teardown already started). */ static int iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, int is_leading) { struct iscsi_conn *conn = cls_conn->dd_data; struct iser_conn *iser_conn; struct iscsi_endpoint *ep; int error; error = iscsi_conn_bind(cls_session, cls_conn, is_leading); if (error) return error; /* the transport ep handle comes from user space so it must be * verified against the global ib connections list */ ep = iscsi_lookup_endpoint(transport_eph); if (!ep) { iser_err("can't bind eph %llx\n", (unsigned long long)transport_eph); return -EINVAL; } iser_conn = ep->dd_data; mutex_lock(&iser_conn->state_mutex); if (iser_conn->state != ISER_CONN_UP) { error = -EINVAL; iser_err("iser_conn %p state is %d, teardown started\n", iser_conn, iser_conn->state); goto out; } error = iser_alloc_rx_descriptors(iser_conn, conn->session); if (error) goto out; /* binds the iSER connection retrieved from the previously * connected ep_handle to the iSCSI layer connection. exchanges * connection pointers */ iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn); conn->dd_data = iser_conn; iser_conn->iscsi_conn = conn; out: iscsi_put_endpoint(ep); mutex_unlock(&iser_conn->state_mutex); return error; } /** * iscsi_iser_conn_start() - start iscsi-iser connection * @cls_conn: iscsi class connection * * Notes: Here iser intialize (or re-initialize) stop_completion as * from this point iscsi must call conn_stop in session/connection * teardown so iser transport must wait for it. */ static int iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) { struct iscsi_conn *iscsi_conn; struct iser_conn *iser_conn; iscsi_conn = cls_conn->dd_data; iser_conn = iscsi_conn->dd_data; reinit_completion(&iser_conn->stop_completion); return iscsi_conn_start(cls_conn); } /** * iscsi_iser_conn_stop() - stop iscsi-iser connection * @cls_conn: iscsi class connection * @flag: indicate if recover or terminate (passed as is) * * Notes: Calling iscsi_conn_stop might theoretically race with * DEVICE_REMOVAL event and dereference a previously freed RDMA device * handle, so we call it under iser the state lock to protect against * this kind of race. */ static void iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) { struct iscsi_conn *conn = cls_conn->dd_data; struct iser_conn *iser_conn = conn->dd_data; iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn); /* * Userspace may have goofed up and not bound the connection or * might have only partially setup the connection. */ if (iser_conn) { mutex_lock(&iser_conn->state_mutex); mutex_lock(&unbind_iser_conn_mutex); iser_conn_terminate(iser_conn); iscsi_conn_stop(cls_conn, flag); /* unbind */ iser_conn->iscsi_conn = NULL; conn->dd_data = NULL; mutex_unlock(&unbind_iser_conn_mutex); complete(&iser_conn->stop_completion); mutex_unlock(&iser_conn->state_mutex); } else { iscsi_conn_stop(cls_conn, flag); } } /** * iscsi_iser_session_destroy() - destroy iscsi-iser session * @cls_session: iscsi class session * * Removes and free iscsi host. */ static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) { struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); iscsi_session_teardown(cls_session); iscsi_host_remove(shost, false); iscsi_host_free(shost); } static inline unsigned int iser_dif_prot_caps(int prot_caps) { int ret = 0; if (prot_caps & IB_PROT_T10DIF_TYPE_1) ret |= SHOST_DIF_TYPE1_PROTECTION | SHOST_DIX_TYPE0_PROTECTION | SHOST_DIX_TYPE1_PROTECTION; if (prot_caps & IB_PROT_T10DIF_TYPE_2) ret |= SHOST_DIF_TYPE2_PROTECTION | SHOST_DIX_TYPE2_PROTECTION; if (prot_caps & IB_PROT_T10DIF_TYPE_3) ret |= SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE3_PROTECTION; return ret; } /** * iscsi_iser_session_create() - create an iscsi-iser session * @ep: iscsi end-point handle * @cmds_max: maximum commands in this session * @qdepth: session command queue depth * @initial_cmdsn: initiator command sequnce number * * Allocates and adds a scsi host, expose DIF supprot if * exists, and sets up an iscsi session. */ static struct iscsi_cls_session * iscsi_iser_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, uint16_t qdepth, uint32_t initial_cmdsn) { struct iscsi_cls_session *cls_session; struct Scsi_Host *shost; struct iser_conn *iser_conn = NULL; struct ib_conn *ib_conn; struct ib_device *ib_dev; u32 max_fr_sectors; shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); if (!shost) return NULL; shost->transportt = iscsi_iser_scsi_transport; shost->cmd_per_lun = qdepth; shost->max_lun = iscsi_max_lun; shost->max_id = 0; shost->max_channel = 0; shost->max_cmd_len = 16; /* * older userspace tools (before 2.0-870) did not pass us * the leading conn's ep so this will be NULL; */ if (ep) { iser_conn = ep->dd_data; shost->sg_tablesize = iser_conn->scsi_sg_tablesize; shost->can_queue = min_t(u16, cmds_max, iser_conn->max_cmds); mutex_lock(&iser_conn->state_mutex); if (iser_conn->state != ISER_CONN_UP) { iser_err("iser conn %p already started teardown\n", iser_conn); mutex_unlock(&iser_conn->state_mutex); goto free_host; } ib_conn = &iser_conn->ib_conn; ib_dev = ib_conn->device->ib_device; if (ib_conn->pi_support) { u32 sig_caps = ib_dev->attrs.sig_prot_cap; shost->sg_prot_tablesize = shost->sg_tablesize; scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps)); scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP | SHOST_DIX_GUARD_CRC); } if (!(ib_dev->attrs.kernel_cap_flags & IBK_SG_GAPS_REG)) shost->virt_boundary_mask = SZ_4K - 1; if (iscsi_host_add(shost, ib_dev->dev.parent)) { mutex_unlock(&iser_conn->state_mutex); goto free_host; } mutex_unlock(&iser_conn->state_mutex); } else { shost->can_queue = min_t(u16, cmds_max, ISER_DEF_XMIT_CMDS_MAX); if (iscsi_host_add(shost, NULL)) goto free_host; } max_fr_sectors = (shost->sg_tablesize * PAGE_SIZE) >> 9; shost->max_sectors = min(iser_max_sectors, max_fr_sectors); iser_dbg("iser_conn %p, sg_tablesize %u, max_sectors %u\n", iser_conn, shost->sg_tablesize, shost->max_sectors); if (shost->max_sectors < iser_max_sectors) iser_warn("max_sectors was reduced from %u to %u\n", iser_max_sectors, shost->max_sectors); cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, shost->can_queue, 0, sizeof(struct iscsi_iser_task), initial_cmdsn, 0); if (!cls_session) goto remove_host; return cls_session; remove_host: iscsi_host_remove(shost, false); free_host: iscsi_host_free(shost); return NULL; } static int iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, char *buf, int buflen) { int value; switch (param) { case ISCSI_PARAM_MAX_RECV_DLENGTH: /* TBD */ break; case ISCSI_PARAM_HDRDGST_EN: sscanf(buf, "%d", &value); if (value) { iser_err("DataDigest wasn't negotiated to None\n"); return -EPROTO; } break; case ISCSI_PARAM_DATADGST_EN: sscanf(buf, "%d", &value); if (value) { iser_err("DataDigest wasn't negotiated to None\n"); return -EPROTO; } break; case ISCSI_PARAM_IFMARKER_EN: sscanf(buf, "%d", &value); if (value) { iser_err("IFMarker wasn't negotiated to No\n"); return -EPROTO; } break; case ISCSI_PARAM_OFMARKER_EN: sscanf(buf, "%d", &value); if (value) { iser_err("OFMarker wasn't negotiated to No\n"); return -EPROTO; } break; default: return iscsi_set_param(cls_conn, param, buf, buflen); } return 0; } /** * iscsi_iser_conn_get_stats() - get iscsi connection statistics * @cls_conn: iscsi class connection * @stats: iscsi stats to output * * Output connection statistics. */ static void iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) { struct iscsi_conn *conn = cls_conn->dd_data; stats->txdata_octets = conn->txdata_octets; stats->rxdata_octets = conn->rxdata_octets; stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; stats->dataout_pdus = conn->dataout_pdus_cnt; stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; stats->custom_length = 0; } static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param, char *buf) { struct iser_conn *iser_conn = ep->dd_data; switch (param) { case ISCSI_PARAM_CONN_PORT: case ISCSI_PARAM_CONN_ADDRESS: if (!iser_conn || !iser_conn->ib_conn.cma_id) return -ENOTCONN; return iscsi_conn_get_addr_param((struct sockaddr_storage *) &iser_conn->ib_conn.cma_id->route.addr.dst_addr, param, buf); default: break; } return -ENOSYS; } /** * iscsi_iser_ep_connect() - Initiate iSER connection establishment * @shost: scsi_host * @dst_addr: destination address * @non_blocking: indicate if routine can block * * Allocate an iscsi endpoint, an iser_conn structure and bind them. * After that start RDMA connection establishment via rdma_cm. We * don't allocate iser_conn embedded in iscsi_endpoint since in teardown * the endpoint will be destroyed at ep_disconnect while iser_conn will * cleanup its resources asynchronuously. * * Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error) * if fails. */ static struct iscsi_endpoint *iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, int non_blocking) { int err; struct iser_conn *iser_conn; struct iscsi_endpoint *ep; ep = iscsi_create_endpoint(0); if (!ep) return ERR_PTR(-ENOMEM); iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL); if (!iser_conn) { err = -ENOMEM; goto failure; } ep->dd_data = iser_conn; iser_conn->ep = ep; iser_conn_init(iser_conn); err = iser_connect(iser_conn, NULL, dst_addr, non_blocking); if (err) goto failure; return ep; failure: iscsi_destroy_endpoint(ep); return ERR_PTR(err); } /** * iscsi_iser_ep_poll() - poll for iser connection establishment to complete * @ep: iscsi endpoint (created at ep_connect) * @timeout_ms: polling timeout allowed in ms. * * This routine boils down to waiting for up_completion signaling * that cma_id got CONNECTED event. * * Return: 1 if succeeded in connection establishment, 0 if timeout expired * (libiscsi will retry will kick in) or -1 if interrupted by signal * or more likely iser connection state transitioned to TEMINATING or * DOWN during the wait period. */ static int iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) { struct iser_conn *iser_conn = ep->dd_data; int rc; rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion, msecs_to_jiffies(timeout_ms)); /* if conn establishment failed, return error code to iscsi */ if (rc == 0) { mutex_lock(&iser_conn->state_mutex); if (iser_conn->state == ISER_CONN_TERMINATING || iser_conn->state == ISER_CONN_DOWN) rc = -1; mutex_unlock(&iser_conn->state_mutex); } iser_info("iser conn %p rc = %d\n", iser_conn, rc); if (rc > 0) return 1; /* success, this is the equivalent of EPOLLOUT */ else if (!rc) return 0; /* timeout */ else return rc; /* signal */ } /** * iscsi_iser_ep_disconnect() - Initiate connection teardown process * @ep: iscsi endpoint handle * * This routine is not blocked by iser and RDMA termination process * completion as we queue a deffered work for iser/RDMA destruction * and cleanup or actually call it immediately in case we didn't pass * iscsi conn bind/start stage, thus it is safe. */ static void iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) { struct iser_conn *iser_conn = ep->dd_data; iser_info("ep %p iser conn %p\n", ep, iser_conn); mutex_lock(&iser_conn->state_mutex); iser_conn_terminate(iser_conn); /* * if iser_conn and iscsi_conn are bound, we must wait for * iscsi_conn_stop and flush errors completion before freeing * the iser resources. Otherwise we are safe to free resources * immediately. */ if (iser_conn->iscsi_conn) { INIT_WORK(&iser_conn->release_work, iser_release_work); queue_work(release_wq, &iser_conn->release_work); mutex_unlock(&iser_conn->state_mutex); } else { iser_conn->state = ISER_CONN_DOWN; mutex_unlock(&iser_conn->state_mutex); iser_conn_release(iser_conn); } iscsi_destroy_endpoint(ep); } static umode_t iser_attr_is_visible(int param_type, int param) { switch (param_type) { case ISCSI_HOST_PARAM: switch (param) { case ISCSI_HOST_PARAM_NETDEV_NAME: case ISCSI_HOST_PARAM_HWADDRESS: case ISCSI_HOST_PARAM_INITIATOR_NAME: return S_IRUGO; default: return 0; } case ISCSI_PARAM: switch (param) { case ISCSI_PARAM_MAX_RECV_DLENGTH: case ISCSI_PARAM_MAX_XMIT_DLENGTH: case ISCSI_PARAM_HDRDGST_EN: case ISCSI_PARAM_DATADGST_EN: case ISCSI_PARAM_CONN_ADDRESS: case ISCSI_PARAM_CONN_PORT: case ISCSI_PARAM_EXP_STATSN: case ISCSI_PARAM_PERSISTENT_ADDRESS: case ISCSI_PARAM_PERSISTENT_PORT: case ISCSI_PARAM_PING_TMO: case ISCSI_PARAM_RECV_TMO: case ISCSI_PARAM_INITIAL_R2T_EN: case ISCSI_PARAM_MAX_R2T: case ISCSI_PARAM_IMM_DATA_EN: case ISCSI_PARAM_FIRST_BURST: case ISCSI_PARAM_MAX_BURST: case ISCSI_PARAM_PDU_INORDER_EN: case ISCSI_PARAM_DATASEQ_INORDER_EN: case ISCSI_PARAM_TARGET_NAME: case ISCSI_PARAM_TPGT: case ISCSI_PARAM_USERNAME: case ISCSI_PARAM_PASSWORD: case ISCSI_PARAM_USERNAME_IN: case ISCSI_PARAM_PASSWORD_IN: case ISCSI_PARAM_FAST_ABORT: case ISCSI_PARAM_ABORT_TMO: case ISCSI_PARAM_LU_RESET_TMO: case ISCSI_PARAM_TGT_RESET_TMO: case ISCSI_PARAM_IFACE_NAME: case ISCSI_PARAM_INITIATOR_NAME: case ISCSI_PARAM_DISCOVERY_SESS: return S_IRUGO; default: return 0; } } return 0; } static struct scsi_host_template iscsi_iser_sht = { .module = THIS_MODULE, .name = "iSCSI Initiator over iSER", .queuecommand = iscsi_queuecommand, .change_queue_depth = scsi_change_queue_depth, .sg_tablesize = ISCSI_ISER_DEF_SG_TABLESIZE, .cmd_per_lun = ISER_DEF_CMD_PER_LUN, .eh_timed_out = iscsi_eh_cmd_timed_out, .eh_abort_handler = iscsi_eh_abort, .eh_device_reset_handler= iscsi_eh_device_reset, .eh_target_reset_handler = iscsi_eh_recover_target, .target_alloc = iscsi_target_alloc, .proc_name = "iscsi_iser", .this_id = -1, .track_queue_depth = 1, .cmd_size = sizeof(struct iscsi_cmd), }; static struct iscsi_transport iscsi_iser_transport = { .owner = THIS_MODULE, .name = "iser", .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO, /* session management */ .create_session = iscsi_iser_session_create, .destroy_session = iscsi_iser_session_destroy, /* connection management */ .create_conn = iscsi_iser_conn_create, .bind_conn = iscsi_iser_conn_bind, .unbind_conn = iscsi_conn_unbind, .destroy_conn = iscsi_conn_teardown, .attr_is_visible = iser_attr_is_visible, .set_param = iscsi_iser_set_param, .get_conn_param = iscsi_conn_get_param, .get_ep_param = iscsi_iser_get_ep_param, .get_session_param = iscsi_session_get_param, .start_conn = iscsi_iser_conn_start, .stop_conn = iscsi_iser_conn_stop, /* iscsi host params */ .get_host_param = iscsi_host_get_param, .set_host_param = iscsi_host_set_param, /* IO */ .send_pdu = iscsi_conn_send_pdu, .get_stats = iscsi_iser_conn_get_stats, .init_task = iscsi_iser_task_init, .xmit_task = iscsi_iser_task_xmit, .cleanup_task = iscsi_iser_cleanup_task, .alloc_pdu = iscsi_iser_pdu_alloc, .check_protection = iscsi_iser_check_protection, /* recovery */ .session_recovery_timedout = iscsi_session_recovery_timedout, .ep_connect = iscsi_iser_ep_connect, .ep_poll = iscsi_iser_ep_poll, .ep_disconnect = iscsi_iser_ep_disconnect }; static int __init iser_init(void) { int err; iser_dbg("Starting iSER datamover...\n"); memset(&ig, 0, sizeof(struct iser_global)); ig.desc_cache = kmem_cache_create("iser_descriptors", sizeof(struct iser_tx_desc), 0, SLAB_HWCACHE_ALIGN, NULL); if (ig.desc_cache == NULL) return -ENOMEM; /* device init is called only after the first addr resolution */ mutex_init(&ig.device_list_mutex); INIT_LIST_HEAD(&ig.device_list); mutex_init(&ig.connlist_mutex); INIT_LIST_HEAD(&ig.connlist); release_wq = alloc_workqueue("release workqueue", 0, 0); if (!release_wq) { iser_err("failed to allocate release workqueue\n"); err = -ENOMEM; goto err_alloc_wq; } iscsi_iser_scsi_transport = iscsi_register_transport( &iscsi_iser_transport); if (!iscsi_iser_scsi_transport) { iser_err("iscsi_register_transport failed\n"); err = -EINVAL; goto err_reg; } return 0; err_reg: destroy_workqueue(release_wq); err_alloc_wq: kmem_cache_destroy(ig.desc_cache); return err; } static void __exit iser_exit(void) { struct iser_conn *iser_conn, *n; int connlist_empty; iser_dbg("Removing iSER datamover...\n"); destroy_workqueue(release_wq); mutex_lock(&ig.connlist_mutex); connlist_empty = list_empty(&ig.connlist); mutex_unlock(&ig.connlist_mutex); if (!connlist_empty) { iser_err("Error cleanup stage completed but we still have iser " "connections, destroying them anyway\n"); list_for_each_entry_safe(iser_conn, n, &ig.connlist, conn_list) { iser_conn_release(iser_conn); } } iscsi_unregister_transport(&iscsi_iser_transport); kmem_cache_destroy(ig.desc_cache); } module_init(iser_init); module_exit(iser_exit);
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