--- /dev/null
+/*
+ * 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"
+
+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 unsigned int iscsi_max_lun = 512;
+module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
+
+int iser_debug_level = 0;
+bool iser_pi_enable = false;
+int iser_pi_guard = 1;
+
+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);
+
+module_param_named(debug_level, iser_debug_level, int, 0644);
+MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
+
+module_param_named(pi_enable, iser_pi_enable, bool, 0644);
+MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)");
+
+module_param_named(pi_guard, iser_pi_guard, int, 0644);
+MODULE_PARM_DESC(pi_guard, "T10-PI guard_type [deprecated]");
+
+static struct workqueue_struct *release_wq;
+struct iser_global ig;
+
+/*
+ * iscsi_iser_recv() - Process a successfull 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;
+ int ahslen;
+
+ /* 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);
+
+ /* read AHS */
+ ahslen = hdr->hlength * 4;
+
+ 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->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->mr->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;
+
+ ib_dma_unmap_single(device->ib_device,
+ tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
+
+ /* 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;
+ 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;
+
+ 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->dev_attr.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;
+ }
+
+ 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 = 4;
+ strcpy(stats->custom[0].desc, "qp_tx_queue_full");
+ stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
+ strcpy(stats->custom[1].desc, "fmr_map_not_avail");
+ stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
+ strcpy(stats->custom[2].desc, "eh_abort_cnt");
+ stats->custom[2].value = conn->eh_abort_cnt;
+ strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
+ stats->custom[3].value = conn->fmr_unalign_cnt;
+}
+
+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;
+ int rc;
+
+ iser_conn = ep->dd_data;
+ 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("ib 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;
+
+ iser_conn = ep->dd_data;
+ iser_info("ep %p iser conn %p state %d\n",
+ ep, iser_conn, iser_conn->state);
+
+ 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_SG_TABLESIZE,
+ .max_sectors = 1024,
+ .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 = DISABLE_CLUSTERING,
+ .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");
+ return -ENOMEM;
+ }
+
+ 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 register_transport_failure;
+ }
+
+ return 0;
+
+register_transport_failure:
+ 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);
Code Review / kvmfornfv.git / blobdiff