diff options
Diffstat (limited to 'drivers/infiniband/ulp/iser/iscsi_iser.c')
| -rw-r--r-- | drivers/infiniband/ulp/iser/iscsi_iser.c | 713 |
1 files changed, 713 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c new file mode 100644 index 0000000..1e5b644 --- /dev/null +++ b/drivers/infiniband/ulp/iser/iscsi_iser.c @@ -0,0 +1,713 @@ +/* + * 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. + * 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 <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; + +MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover " + "v" DRV_VER " (" DRV_DATE ")"); +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); + +module_param_named(debug_level, iser_debug_level, int, 0644); +MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); + +struct iser_global ig; + +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) { + printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n", + datalen, rx_data_len); + rc = ISCSI_ERR_DATALEN; + goto error; + } + + /* 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_task_init - Initialize task + * @task: iscsi task + * + * Initialize the task for the scsi command or mgmt command. + */ +static int +iscsi_iser_task_init(struct iscsi_task *task) +{ + struct iscsi_iser_conn *iser_conn = task->conn->dd_data; + struct iscsi_iser_task *iser_task = task->dd_data; + + /* mgmt task */ + if (!task->sc) { + iser_task->desc.data = task->data; + return 0; + } + + iser_task->command_sent = 0; + iser_task->iser_conn = iser_conn; + iser_task_rdma_init(iser_task); + 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; + + debug_scsi("task deq [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 + */ + if (error && error != -ENOBUFS) + iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + + return error; +} + +static int +iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, + struct iscsi_task *task) +{ + struct iscsi_data hdr; + int error = 0; + + /* Send data-out PDUs while there's still unsolicited data to send */ + while (task->unsol_count > 0) { + iscsi_prep_unsolicit_data_pdu(task, &hdr); + debug_scsi("Sending data-out: itt 0x%x, data count %d\n", + hdr.itt, task->data_count); + + /* the buffer description has been passed with the command */ + /* Send the command */ + error = iser_send_data_out(conn, task, &hdr); + if (error) { + task->unsol_datasn--; + goto iscsi_iser_task_xmit_unsol_data_exit; + } + task->unsol_count -= task->data_count; + debug_scsi("Need to send %d more as data-out PDUs\n", + task->unsol_count); + } + +iscsi_iser_task_xmit_unsol_data_exit: + return error; +} + +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); + + debug_scsi("cmd [itt %x total %d imm %d unsol_data %d\n", + task->itt, scsi_bufflen(task->sc), + task->imm_count, task->unsol_count); + } + + debug_scsi("task deq [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 (task->unsol_count) + error = iscsi_iser_task_xmit_unsol_data(conn, task); + + iscsi_iser_task_xmit_exit: + if (error && error != -ENOBUFS) + iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + return error; +} + +static void +iscsi_iser_cleanup_task(struct iscsi_conn *conn, struct iscsi_task *task) +{ + struct iscsi_iser_task *iser_task = task->dd_data; + + /* 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); + } +} + +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; + struct iscsi_iser_conn *iser_conn; + + cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), 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 = 128; + + iser_conn = conn->dd_data; + conn->dd_data = iser_conn; + iser_conn->iscsi_conn = conn; + + return cls_conn; +} + +static void +iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_iser_conn *iser_conn = conn->dd_data; + struct iser_conn *ib_conn = iser_conn->ib_conn; + + iscsi_conn_teardown(cls_conn); + /* + * Userspace will normally call the stop callback and + * already have freed the ib_conn, but if it goofed up then + * we free it here. + */ + if (ib_conn) { + ib_conn->iser_conn = NULL; + iser_conn_put(ib_conn); + } +} + +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 iscsi_iser_conn *iser_conn; + struct iser_conn *ib_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; + } + ib_conn = ep->dd_data; + + /* binds the iSER connection retrieved from the previously + * connected ep_handle to the iSCSI layer connection. exchanges + * connection pointers */ + iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn); + iser_conn = conn->dd_data; + ib_conn->iser_conn = iser_conn; + iser_conn->ib_conn = ib_conn; + iser_conn_get(ib_conn); + return 0; +} + +static void +iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_iser_conn *iser_conn = conn->dd_data; + struct iser_conn *ib_conn = iser_conn->ib_conn; + + /* + * Userspace may have goofed up and not bound the connection or + * might have only partially setup the connection. + */ + if (ib_conn) { + iscsi_conn_stop(cls_conn, flag); + /* + * There is no unbind event so the stop callback + * must release the ref from the bind. + */ + iser_conn_put(ib_conn); + } + iser_conn->ib_conn = NULL; +} + +static int +iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + int err; + + err = iser_conn_set_full_featured_mode(conn); + if (err) + return err; + + return iscsi_conn_start(cls_conn); +} + +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 struct iscsi_cls_session * +iscsi_iser_session_create(struct iscsi_endpoint *ep, + uint16_t cmds_max, uint16_t qdepth, + uint32_t initial_cmdsn, uint32_t *hostno) +{ + struct iscsi_cls_session *cls_session; + struct iscsi_session *session; + struct Scsi_Host *shost; + int i; + struct iscsi_task *task; + struct iscsi_iser_task *iser_task; + struct iser_conn *ib_conn; + + shost = iscsi_host_alloc(&iscsi_iser_sht, 0, ISCSI_MAX_CMD_PER_LUN); + if (!shost) + return NULL; + shost->transportt = iscsi_iser_scsi_transport; + 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) + ib_conn = ep->dd_data; + + if (iscsi_host_add(shost, + ep ? ib_conn->device->ib_device->dma_device : NULL)) + goto free_host; + *hostno = shost->host_no; + + /* + * we do not support setting can_queue cmd_per_lun from userspace yet + * because we preallocate so many resources + */ + cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, + ISCSI_DEF_XMIT_CMDS_MAX, + 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; + /* libiscsi setup itts, data and pool so just set desc fields */ + for (i = 0; i < session->cmds_max; i++) { + task = session->cmds[i]; + iser_task = task->dd_data; + task->hdr = (struct iscsi_cmd *)&iser_task->desc.iscsi_header; + task->hdr_max = sizeof(iser_task->desc.iscsi_header); + } + 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) { + printk(KERN_ERR "DataDigest wasn't negotiated to None"); + return -EPROTO; + } + break; + case ISCSI_PARAM_DATADGST_EN: + sscanf(buf, "%d", &value); + if (value) { + printk(KERN_ERR "DataDigest wasn't negotiated to None"); + return -EPROTO; + } + break; + case ISCSI_PARAM_IFMARKER_EN: + sscanf(buf, "%d", &value); + if (value) { + printk(KERN_ERR "IFMarker wasn't negotiated to No"); + return -EPROTO; + } + break; + case ISCSI_PARAM_OFMARKER_EN: + sscanf(buf, "%d", &value); + if (value) { + printk(KERN_ERR "OFMarker wasn't negotiated to No"); + return -EPROTO; + } + break; + default: + return iscsi_set_param(cls_conn, param, buf, buflen); + } + + return 0; +} + +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 struct iscsi_endpoint * +iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking) +{ + int err; + struct iser_conn *ib_conn; + struct iscsi_endpoint *ep; + + ep = iscsi_create_endpoint(sizeof(*ib_conn)); + if (!ep) + return ERR_PTR(-ENOMEM); + + ib_conn = ep->dd_data; + ib_conn->ep = ep; + iser_conn_init(ib_conn); + + err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, + non_blocking); + if (err) { + iscsi_destroy_endpoint(ep); + return ERR_PTR(err); + } + return ep; +} + +static int +iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) +{ + struct iser_conn *ib_conn; + int rc; + + ib_conn = ep->dd_data; + rc = wait_event_interruptible_timeout(ib_conn->wait, + ib_conn->state == ISER_CONN_UP, + msecs_to_jiffies(timeout_ms)); + + /* if conn establishment failed, return error code to iscsi */ + if (!rc && + (ib_conn->state == ISER_CONN_TERMINATING || + ib_conn->state == ISER_CONN_DOWN)) + rc = -1; + + iser_err("ib conn %p rc = %d\n", ib_conn, rc); + + if (rc > 0) + return 1; /* success, this is the equivalent of POLLOUT */ + else if (!rc) + return 0; /* timeout */ + else + return rc; /* signal */ +} + +static void +iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) +{ + struct iser_conn *ib_conn; + + ib_conn = ep->dd_data; + if (ib_conn->iser_conn) + /* + * Must suspend xmit path if the ep is bound to the + * iscsi_conn, so we know we are not accessing the ib_conn + * when we free it. + * + * This may not be bound if the ep poll failed. + */ + iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); + + + iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); + iser_conn_terminate(ib_conn); +} + +static struct scsi_host_template iscsi_iser_sht = { + .module = THIS_MODULE, + .name = "iSCSI Initiator over iSER, v." DRV_VER, + .queuecommand = iscsi_queuecommand, + .change_queue_depth = iscsi_change_queue_depth, + .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, + .max_sectors = 1024, + .cmd_per_lun = ISCSI_MAX_CMD_PER_LUN, + .eh_abort_handler = iscsi_eh_abort, + .eh_device_reset_handler= iscsi_eh_device_reset, + .eh_target_reset_handler= iscsi_eh_target_reset, + .use_clustering = DISABLE_CLUSTERING, + .proc_name = "iscsi_iser", + .this_id = -1, +}; + +static struct iscsi_transport iscsi_iser_transport = { + .owner = THIS_MODULE, + .name = "iser", + .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, + .param_mask = ISCSI_MAX_RECV_DLENGTH | + ISCSI_MAX_XMIT_DLENGTH | + ISCSI_HDRDGST_EN | + ISCSI_DATADGST_EN | + ISCSI_INITIAL_R2T_EN | + ISCSI_MAX_R2T | + ISCSI_IMM_DATA_EN | + ISCSI_FIRST_BURST | + ISCSI_MAX_BURST | + ISCSI_PDU_INORDER_EN | + ISCSI_DATASEQ_INORDER_EN | + ISCSI_EXP_STATSN | + ISCSI_PERSISTENT_PORT | + ISCSI_PERSISTENT_ADDRESS | + ISCSI_TARGET_NAME | ISCSI_TPGT | + ISCSI_USERNAME | ISCSI_PASSWORD | + ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | + ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | + ISCSI_PING_TMO | ISCSI_RECV_TMO | + ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, + .host_param_mask = ISCSI_HOST_HWADDRESS | + ISCSI_HOST_NETDEV_NAME | + ISCSI_HOST_INITIATOR_NAME, + /* 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_iser_conn_destroy, + .set_param = iscsi_iser_set_param, + .get_conn_param = iscsi_conn_get_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, + /* 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) { + printk(KERN_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_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); + + 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) +{ + iser_dbg("Removing iSER datamover...\n"); + iscsi_unregister_transport(&iscsi_iser_transport); + kmem_cache_destroy(ig.desc_cache); +} + +module_init(iser_init); +module_exit(iser_exit); |
