| /* |
| * 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 <asm/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"); |
| MODULE_VERSION(DRV_VER); |
| |
| 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; |
| 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 unsigned int iscsi_max_lun = 512; |
| module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); |
| MODULE_PARM_DESC(max_lun, "Max LUNs to allow per session (default:512"); |
| |
| unsigned int iser_max_sectors = ISER_DEF_MAX_SECTORS; |
| module_param_named(max_sectors, iser_max_sectors, uint, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(max_sectors, "Max number of sectors in a single scsi command (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)"); |
| |
| int iser_pi_guard; |
| module_param_named(pi_guard, iser_pi_guard, int, S_IRUGO); |
| MODULE_PARM_DESC(pi_guard, "T10-PI guard_type [deprecated]"); |
| |
| /* |
| * 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; |
| const bool mgmt_task = !task->sc && !in_interrupt(); |
| int ret = 0; |
| |
| if (unlikely(mgmt_task)) |
| mutex_lock(&iser_conn->state_mutex); |
| |
| if (unlikely(iser_conn->state != ISER_CONN_UP)) { |
| ret = -ENODEV; |
| goto out; |
| } |
| |
| 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)) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| tx_desc->wr_idx = 0; |
| 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; |
| out: |
| if (unlikely(mgmt_task)) |
| mutex_unlock(&iser_conn->state_mutex); |
| |
| return ret; |
| } |
| |
| /** |
| * 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; |
| |
| if (iser_task->dir[ISER_DIR_IN]) |
| return iser_check_task_pi_status(iser_task, ISER_DIR_IN, |
| sector); |
| else |
| return iser_check_task_pi_status(iser_task, ISER_DIR_OUT, |
| 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: |
| 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); |
| iser_conn_terminate(iser_conn); |
| iscsi_conn_stop(cls_conn, flag); |
| |
| /* unbind */ |
| iser_conn->iscsi_conn = NULL; |
| conn->dd_data = NULL; |
| |
| 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); |
| iscsi_host_free(shost); |
| } |
| |
| static inline unsigned int |
| iser_dif_prot_caps(int prot_caps) |
| { |
| return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? |
| SHOST_DIF_TYPE1_PROTECTION | SHOST_DIX_TYPE0_PROTECTION | |
| SHOST_DIX_TYPE1_PROTECTION : 0) | |
| ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? |
| SHOST_DIF_TYPE2_PROTECTION | SHOST_DIX_TYPE2_PROTECTION : 0) | |
| ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? |
| SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE3_PROTECTION : 0); |
| } |
| |
| /** |
| * 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 iscsi_session *session; |
| struct Scsi_Host *shost; |
| struct iser_conn *iser_conn = NULL; |
| struct ib_conn *ib_conn; |
| u32 max_fr_sectors; |
| u16 max_cmds; |
| |
| 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; |
| max_cmds = iser_conn->max_cmds; |
| shost->sg_tablesize = iser_conn->scsi_sg_tablesize; |
| |
| 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; |
| if (ib_conn->pi_support) { |
| u32 sig_caps = ib_conn->device->ib_device->attrs.sig_prot_cap; |
| |
| 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 (iscsi_host_add(shost, |
| ib_conn->device->ib_device->dma_device)) { |
| mutex_unlock(&iser_conn->state_mutex); |
| goto free_host; |
| } |
| mutex_unlock(&iser_conn->state_mutex); |
| } else { |
| max_cmds = ISER_DEF_XMIT_CMDS_MAX; |
| if (iscsi_host_add(shost, NULL)) |
| goto free_host; |
| } |
| |
| /* |
| * FRs or FMRs can only map up to a (device) page per entry, but if the |
| * first entry is misaligned we'll end up using using two entries |
| * (head and tail) for a single page worth data, so we have to drop |
| * one segment from the calculation. |
| */ |
| max_fr_sectors = ((shost->sg_tablesize - 1) * PAGE_SIZE) >> 9; |
| shost->max_sectors = min(iser_max_sectors, max_fr_sectors); |
| |
| if (cmds_max > max_cmds) { |
| iser_info("cmds_max changed from %u to %u\n", |
| cmds_max, max_cmds); |
| cmds_max = max_cmds; |
| } |
| |
| cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, |
| cmds_max, 0, |
| sizeof(struct iscsi_iser_task), |
| initial_cmdsn, 0); |
| if (!cls_session) |
| goto remove_host; |
| session = cls_session->dd_data; |
| |
| shost->can_queue = session->scsi_cmds_max; |
| return cls_session; |
| |
| remove_host: |
| iscsi_host_remove(shost); |
| 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_set_param() - set class connection parameter |
| * @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; |
| int len; |
| |
| 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); |
| break; |
| default: |
| return -ENOSYS; |
| } |
| |
| return len; |
| } |
| |
| /** |
| * 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 POLLOUT */ |
| 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 int iscsi_iser_slave_alloc(struct scsi_device *sdev) |
| { |
| struct iscsi_session *session; |
| struct iser_conn *iser_conn; |
| struct ib_device *ib_dev; |
| |
| session = starget_to_session(scsi_target(sdev))->dd_data; |
| iser_conn = session->leadconn->dd_data; |
| ib_dev = iser_conn->ib_conn.device->ib_device; |
| |
| if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG)) |
| blk_queue_virt_boundary(sdev->request_queue, ~MASK_4K); |
| |
| 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_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, |
| .use_clustering = ENABLE_CLUSTERING, |
| .slave_alloc = iscsi_iser_slave_alloc, |
| .proc_name = "iscsi_iser", |
| .this_id = -1, |
| .track_queue_depth = 1, |
| }; |
| |
| 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, |
| .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"); |
| |
| if (iscsi_max_lun < 1) { |
| iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); |
| return -EINVAL; |
| } |
| |
| 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); |