1126 lines
31 KiB
C
1126 lines
31 KiB
C
/*
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* iSCSI Initiator over iSER Data-Path
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*
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* Copyright (C) 2004 Dmitry Yusupov
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* Copyright (C) 2004 Alex Aizman
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* Copyright (C) 2005 Mike Christie
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* Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved.
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* Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
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* maintained by openib-general@openib.org
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Credits:
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* Christoph Hellwig
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* FUJITA Tomonori
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* Arne Redlich
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* Zhenyu Wang
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* Modified by:
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* Erez Zilber
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*/
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/hardirq.h>
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#include <linux/kfifo.h>
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#include <linux/blkdev.h>
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#include <linux/init.h>
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#include <linux/ioctl.h>
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#include <linux/cdev.h>
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#include <linux/in.h>
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#include <linux/net.h>
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#include <linux/scatterlist.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <net/sock.h>
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#include <linux/uaccess.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_transport_iscsi.h>
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#include "iscsi_iser.h"
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MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover");
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
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MODULE_VERSION(DRV_VER);
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static struct scsi_host_template iscsi_iser_sht;
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static struct iscsi_transport iscsi_iser_transport;
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static struct scsi_transport_template *iscsi_iser_scsi_transport;
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static struct workqueue_struct *release_wq;
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struct iser_global ig;
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int iser_debug_level = 0;
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module_param_named(debug_level, iser_debug_level, int, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
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static unsigned int iscsi_max_lun = 512;
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module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
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MODULE_PARM_DESC(max_lun, "Max LUNs to allow per session (default:512");
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unsigned int iser_max_sectors = ISER_DEF_MAX_SECTORS;
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module_param_named(max_sectors, iser_max_sectors, uint, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(max_sectors, "Max number of sectors in a single scsi command (default:1024");
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bool iser_always_reg = true;
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module_param_named(always_register, iser_always_reg, bool, S_IRUGO);
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MODULE_PARM_DESC(always_register,
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"Always register memory, even for continuous memory regions (default:true)");
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bool iser_pi_enable = false;
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module_param_named(pi_enable, iser_pi_enable, bool, S_IRUGO);
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MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)");
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int iser_pi_guard;
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module_param_named(pi_guard, iser_pi_guard, int, S_IRUGO);
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MODULE_PARM_DESC(pi_guard, "T10-PI guard_type [deprecated]");
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/*
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* iscsi_iser_recv() - Process a successful recv completion
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* @conn: iscsi connection
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* @hdr: iscsi header
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* @rx_data: buffer containing receive data payload
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* @rx_data_len: length of rx_data
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*
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* Notes: In case of data length errors or iscsi PDU completion failures
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* this routine will signal iscsi layer of connection failure.
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*/
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void
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iscsi_iser_recv(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
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char *rx_data, int rx_data_len)
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{
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int rc = 0;
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int datalen;
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/* verify PDU length */
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datalen = ntoh24(hdr->dlength);
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if (datalen > rx_data_len || (datalen + 4) < rx_data_len) {
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iser_err("wrong datalen %d (hdr), %d (IB)\n",
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datalen, rx_data_len);
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rc = ISCSI_ERR_DATALEN;
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goto error;
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}
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if (datalen != rx_data_len)
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iser_dbg("aligned datalen (%d) hdr, %d (IB)\n",
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datalen, rx_data_len);
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rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
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if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
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goto error;
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return;
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error:
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iscsi_conn_failure(conn, rc);
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}
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/**
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* iscsi_iser_pdu_alloc() - allocate an iscsi-iser PDU
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* @task: iscsi task
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* @opcode: iscsi command opcode
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*
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* Netes: This routine can't fail, just assign iscsi task
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* hdr and max hdr size.
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*/
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static int
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iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
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{
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struct iscsi_iser_task *iser_task = task->dd_data;
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task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
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task->hdr_max = sizeof(iser_task->desc.iscsi_header);
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return 0;
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}
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/**
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* iser_initialize_task_headers() - Initialize task headers
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* @task: iscsi task
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* @tx_desc: iser tx descriptor
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*
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* Notes:
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* This routine may race with iser teardown flow for scsi
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* error handling TMFs. So for TMF we should acquire the
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* state mutex to avoid dereferencing the IB device which
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* may have already been terminated.
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*/
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int
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iser_initialize_task_headers(struct iscsi_task *task,
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struct iser_tx_desc *tx_desc)
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{
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struct iser_conn *iser_conn = task->conn->dd_data;
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struct iser_device *device = iser_conn->ib_conn.device;
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struct iscsi_iser_task *iser_task = task->dd_data;
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u64 dma_addr;
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const bool mgmt_task = !task->sc && !in_interrupt();
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int ret = 0;
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if (unlikely(mgmt_task))
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mutex_lock(&iser_conn->state_mutex);
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if (unlikely(iser_conn->state != ISER_CONN_UP)) {
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ret = -ENODEV;
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goto out;
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}
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dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
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ISER_HEADERS_LEN, DMA_TO_DEVICE);
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if (ib_dma_mapping_error(device->ib_device, dma_addr)) {
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ret = -ENOMEM;
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goto out;
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}
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tx_desc->wr_idx = 0;
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tx_desc->mapped = true;
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tx_desc->dma_addr = dma_addr;
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tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
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tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
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tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
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iser_task->iser_conn = iser_conn;
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out:
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if (unlikely(mgmt_task))
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mutex_unlock(&iser_conn->state_mutex);
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return ret;
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}
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/**
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* iscsi_iser_task_init() - Initialize iscsi-iser task
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* @task: iscsi task
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*
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* Initialize the task for the scsi command or mgmt command.
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*
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* Return: Returns zero on success or -ENOMEM when failing
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* to init task headers (dma mapping error).
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*/
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static int
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iscsi_iser_task_init(struct iscsi_task *task)
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{
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struct iscsi_iser_task *iser_task = task->dd_data;
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int ret;
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ret = iser_initialize_task_headers(task, &iser_task->desc);
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if (ret) {
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iser_err("Failed to init task %p, err = %d\n",
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iser_task, ret);
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return ret;
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}
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/* mgmt task */
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if (!task->sc)
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return 0;
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iser_task->command_sent = 0;
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iser_task_rdma_init(iser_task);
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iser_task->sc = task->sc;
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return 0;
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}
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/**
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* iscsi_iser_mtask_xmit() - xmit management (immediate) task
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* @conn: iscsi connection
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* @task: task management task
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*
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* Notes:
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* The function can return -EAGAIN in which case caller must
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* call it again later, or recover. '0' return code means successful
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* xmit.
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*
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**/
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static int
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iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
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{
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int error = 0;
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iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);
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error = iser_send_control(conn, task);
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/* since iser xmits control with zero copy, tasks can not be recycled
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* right after sending them.
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* The recycling scheme is based on whether a response is expected
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* - if yes, the task is recycled at iscsi_complete_pdu
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* - if no, the task is recycled at iser_snd_completion
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*/
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return error;
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}
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static int
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iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
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struct iscsi_task *task)
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{
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struct iscsi_r2t_info *r2t = &task->unsol_r2t;
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struct iscsi_data hdr;
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int error = 0;
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/* Send data-out PDUs while there's still unsolicited data to send */
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while (iscsi_task_has_unsol_data(task)) {
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iscsi_prep_data_out_pdu(task, r2t, &hdr);
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iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
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hdr.itt, r2t->data_count);
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|
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/* the buffer description has been passed with the command */
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/* Send the command */
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error = iser_send_data_out(conn, task, &hdr);
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if (error) {
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r2t->datasn--;
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goto iscsi_iser_task_xmit_unsol_data_exit;
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}
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r2t->sent += r2t->data_count;
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iser_dbg("Need to send %d more as data-out PDUs\n",
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r2t->data_length - r2t->sent);
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}
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iscsi_iser_task_xmit_unsol_data_exit:
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return error;
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}
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/**
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* iscsi_iser_task_xmit() - xmit iscsi-iser task
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* @task: iscsi task
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*
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* Return: zero on success or escalates $error on failure.
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*/
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static int
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iscsi_iser_task_xmit(struct iscsi_task *task)
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{
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struct iscsi_conn *conn = task->conn;
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struct iscsi_iser_task *iser_task = task->dd_data;
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int error = 0;
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if (!task->sc)
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return iscsi_iser_mtask_xmit(conn, task);
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|
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if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
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BUG_ON(scsi_bufflen(task->sc) == 0);
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|
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iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
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task->itt, scsi_bufflen(task->sc),
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task->imm_count, task->unsol_r2t.data_length);
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}
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iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
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conn->id, task->itt);
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/* Send the cmd PDU */
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if (!iser_task->command_sent) {
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error = iser_send_command(conn, task);
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if (error)
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goto iscsi_iser_task_xmit_exit;
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iser_task->command_sent = 1;
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}
|
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|
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/* Send unsolicited data-out PDU(s) if necessary */
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if (iscsi_task_has_unsol_data(task))
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error = iscsi_iser_task_xmit_unsol_data(conn, task);
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iscsi_iser_task_xmit_exit:
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return error;
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}
|
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/**
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* iscsi_iser_cleanup_task() - cleanup an iscsi-iser task
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* @task: iscsi task
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*
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* Notes: In case the RDMA device is already NULL (might have
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* been removed in DEVICE_REMOVAL CM event it will bail-out
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* without doing dma unmapping.
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*/
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static void iscsi_iser_cleanup_task(struct iscsi_task *task)
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{
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struct iscsi_iser_task *iser_task = task->dd_data;
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struct iser_tx_desc *tx_desc = &iser_task->desc;
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struct iser_conn *iser_conn = task->conn->dd_data;
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struct iser_device *device = iser_conn->ib_conn.device;
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|
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/* DEVICE_REMOVAL event might have already released the device */
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if (!device)
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return;
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|
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if (likely(tx_desc->mapped)) {
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ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
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ISER_HEADERS_LEN, DMA_TO_DEVICE);
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tx_desc->mapped = false;
|
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}
|
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|
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/* mgmt tasks do not need special cleanup */
|
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if (!task->sc)
|
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return;
|
|
|
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if (iser_task->status == ISER_TASK_STATUS_STARTED) {
|
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iser_task->status = ISER_TASK_STATUS_COMPLETED;
|
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iser_task_rdma_finalize(iser_task);
|
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}
|
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}
|
|
|
|
/**
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* iscsi_iser_check_protection() - check protection information status of task.
|
|
* @task: iscsi task
|
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* @sector: error sector if exsists (output)
|
|
*
|
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* 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
|
|
*
|
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* In addition the error sector is marked.
|
|
*/
|
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static u8
|
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iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector)
|
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{
|
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struct iscsi_iser_task *iser_task = task->dd_data;
|
|
|
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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);
|
|
}
|
|
|
|
/*
|
|
* Limit the sg_tablesize and max_sectors based on the device
|
|
* max fastreg page list length.
|
|
*/
|
|
shost->sg_tablesize = min_t(unsigned short, shost->sg_tablesize,
|
|
ib_conn->device->ib_device->attrs.max_fast_reg_page_list_len);
|
|
|
|
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);
|