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595 lines
19 KiB
595 lines
19 KiB
/* |
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* iSER transport for the Open iSCSI Initiator & iSER transport internals |
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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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* based on code maintained by [email protected] |
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* |
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* Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. |
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* Copyright (c) 2005, 2006 Cisco Systems. All rights reserved. |
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* Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved. |
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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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#ifndef __ISCSI_ISER_H__ |
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#define __ISCSI_ISER_H__ |
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#include <linux/types.h> |
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#include <linux/net.h> |
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#include <linux/printk.h> |
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#include <scsi/libiscsi.h> |
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#include <scsi/scsi_transport_iscsi.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/iser.h> |
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#include <linux/interrupt.h> |
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#include <linux/wait.h> |
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#include <linux/sched.h> |
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#include <linux/list.h> |
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#include <linux/slab.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/mutex.h> |
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#include <linux/mempool.h> |
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#include <linux/uio.h> |
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|
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#include <linux/socket.h> |
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#include <linux/in.h> |
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#include <linux/in6.h> |
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|
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#include <rdma/ib_verbs.h> |
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#include <rdma/rdma_cm.h> |
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#define DRV_NAME "iser" |
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#define PFX DRV_NAME ": " |
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#define DRV_VER "1.6" |
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|
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#define iser_dbg(fmt, arg...) \ |
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do { \ |
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if (unlikely(iser_debug_level > 2)) \ |
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printk(KERN_DEBUG PFX "%s: " fmt,\ |
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__func__ , ## arg); \ |
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} while (0) |
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|
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#define iser_warn(fmt, arg...) \ |
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do { \ |
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if (unlikely(iser_debug_level > 0)) \ |
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pr_warn(PFX "%s: " fmt, \ |
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__func__ , ## arg); \ |
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} while (0) |
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|
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#define iser_info(fmt, arg...) \ |
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do { \ |
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if (unlikely(iser_debug_level > 1)) \ |
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pr_info(PFX "%s: " fmt, \ |
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__func__ , ## arg); \ |
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} while (0) |
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|
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#define iser_err(fmt, arg...) \ |
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pr_err(PFX "%s: " fmt, __func__ , ## arg) |
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|
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/* Default support is 512KB I/O size */ |
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#define ISER_DEF_MAX_SECTORS 1024 |
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#define ISCSI_ISER_DEF_SG_TABLESIZE \ |
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((ISER_DEF_MAX_SECTORS * SECTOR_SIZE) >> ilog2(SZ_4K)) |
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/* Maximum support is 16MB I/O size */ |
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#define ISCSI_ISER_MAX_SG_TABLESIZE ((32768 * SECTOR_SIZE) >> ilog2(SZ_4K)) |
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#define ISER_DEF_XMIT_CMDS_DEFAULT 512 |
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#if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT |
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#define ISER_DEF_XMIT_CMDS_MAX ISCSI_DEF_XMIT_CMDS_MAX |
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#else |
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#define ISER_DEF_XMIT_CMDS_MAX ISER_DEF_XMIT_CMDS_DEFAULT |
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#endif |
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#define ISER_DEF_CMD_PER_LUN ISER_DEF_XMIT_CMDS_MAX |
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/* QP settings */ |
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/* Maximal bounds on received asynchronous PDUs */ |
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#define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */ |
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#define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), * |
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* SCSI_TMFUNC(2), LOGOUT(1) */ |
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#define ISER_QP_MAX_RECV_DTOS (ISER_DEF_XMIT_CMDS_MAX) |
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#define ISER_MIN_POSTED_RX (ISER_DEF_XMIT_CMDS_MAX >> 2) |
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|
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/* the max TX (send) WR supported by the iSER QP is defined by * |
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* max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect * |
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* to have at max for SCSI command. The tx posting & completion handling code * |
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* supports -EAGAIN scheme where tx is suspended till the QP has room for more * |
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* send WR. D=8 comes from 64K/8K */ |
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#define ISER_INFLIGHT_DATAOUTS 8 |
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#define ISER_QP_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \ |
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(1 + ISER_INFLIGHT_DATAOUTS) + \ |
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ISER_MAX_TX_MISC_PDUS + \ |
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ISER_MAX_RX_MISC_PDUS) |
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|
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/* Max registration work requests per command */ |
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#define ISER_MAX_REG_WR_PER_CMD 5 |
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|
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/* For Signature we don't support DATAOUTs so no need to make room for them */ |
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#define ISER_QP_SIG_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \ |
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(1 + ISER_MAX_REG_WR_PER_CMD) + \ |
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ISER_MAX_TX_MISC_PDUS + \ |
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ISER_MAX_RX_MISC_PDUS) |
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#define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr \ |
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- ISER_MAX_TX_MISC_PDUS \ |
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- ISER_MAX_RX_MISC_PDUS) / \ |
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(1 + ISER_INFLIGHT_DATAOUTS)) |
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#define ISER_SIGNAL_CMD_COUNT 32 |
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|
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/* Constant PDU lengths calculations */ |
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#define ISER_HEADERS_LEN (sizeof(struct iser_ctrl) + sizeof(struct iscsi_hdr)) |
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#define ISER_RECV_DATA_SEG_LEN 128 |
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#define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN) |
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#define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN) |
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/* Length of an object name string */ |
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#define ISER_OBJECT_NAME_SIZE 64 |
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enum iser_conn_state { |
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ISER_CONN_INIT, /* descriptor allocd, no conn */ |
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ISER_CONN_PENDING, /* in the process of being established */ |
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ISER_CONN_UP, /* up and running */ |
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ISER_CONN_TERMINATING, /* in the process of being terminated */ |
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ISER_CONN_DOWN, /* shut down */ |
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ISER_CONN_STATES_NUM |
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}; |
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enum iser_task_status { |
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ISER_TASK_STATUS_INIT = 0, |
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ISER_TASK_STATUS_STARTED, |
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ISER_TASK_STATUS_COMPLETED |
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}; |
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enum iser_data_dir { |
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ISER_DIR_IN = 0, /* to initiator */ |
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ISER_DIR_OUT, /* from initiator */ |
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ISER_DIRS_NUM |
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}; |
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/** |
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* struct iser_data_buf - iSER data buffer |
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* |
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* @sg: pointer to the sg list |
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* @size: num entries of this sg |
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* @data_len: total beffer byte len |
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* @dma_nents: returned by dma_map_sg |
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*/ |
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struct iser_data_buf { |
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struct scatterlist *sg; |
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int size; |
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unsigned long data_len; |
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int dma_nents; |
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}; |
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|
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/* fwd declarations */ |
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struct iser_device; |
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struct iscsi_iser_task; |
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struct iscsi_endpoint; |
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struct iser_reg_resources; |
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/** |
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* struct iser_mem_reg - iSER memory registration info |
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* |
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* @sge: memory region sg element |
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* @rkey: memory region remote key |
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* @mem_h: pointer to registration context (FMR/Fastreg) |
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*/ |
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struct iser_mem_reg { |
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struct ib_sge sge; |
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u32 rkey; |
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void *mem_h; |
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}; |
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enum iser_desc_type { |
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ISCSI_TX_CONTROL , |
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ISCSI_TX_SCSI_COMMAND, |
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ISCSI_TX_DATAOUT |
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}; |
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/** |
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* struct iser_tx_desc - iSER TX descriptor |
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* |
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* @iser_header: iser header |
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* @iscsi_header: iscsi header |
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* @type: command/control/dataout |
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* @dma_addr: header buffer dma_address |
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* @tx_sg: sg[0] points to iser/iscsi headers |
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* sg[1] optionally points to either of immediate data |
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* unsolicited data-out or control |
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* @num_sge: number sges used on this TX task |
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* @cqe: completion handler |
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* @mapped: Is the task header mapped |
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* @reg_wr: registration WR |
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* @send_wr: send WR |
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* @inv_wr: invalidate WR |
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*/ |
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struct iser_tx_desc { |
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struct iser_ctrl iser_header; |
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struct iscsi_hdr iscsi_header; |
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enum iser_desc_type type; |
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u64 dma_addr; |
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struct ib_sge tx_sg[2]; |
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int num_sge; |
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struct ib_cqe cqe; |
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bool mapped; |
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struct ib_reg_wr reg_wr; |
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struct ib_send_wr send_wr; |
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struct ib_send_wr inv_wr; |
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}; |
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#define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \ |
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sizeof(u64) + sizeof(struct ib_sge) + \ |
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sizeof(struct ib_cqe))) |
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/** |
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* struct iser_rx_desc - iSER RX descriptor |
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* |
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* @iser_header: iser header |
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* @iscsi_header: iscsi header |
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* @data: received data segment |
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* @dma_addr: receive buffer dma address |
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* @rx_sg: ib_sge of receive buffer |
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* @cqe: completion handler |
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* @pad: for sense data TODO: Modify to maximum sense length supported |
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*/ |
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struct iser_rx_desc { |
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struct iser_ctrl iser_header; |
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struct iscsi_hdr iscsi_header; |
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char data[ISER_RECV_DATA_SEG_LEN]; |
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u64 dma_addr; |
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struct ib_sge rx_sg; |
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struct ib_cqe cqe; |
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char pad[ISER_RX_PAD_SIZE]; |
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} __packed; |
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/** |
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* struct iser_login_desc - iSER login descriptor |
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* |
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* @req: pointer to login request buffer |
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* @rsp: pointer to login response buffer |
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* @req_dma: DMA address of login request buffer |
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* @rsp_dma: DMA address of login response buffer |
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* @sge: IB sge for login post recv |
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* @cqe: completion handler |
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*/ |
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struct iser_login_desc { |
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void *req; |
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void *rsp; |
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u64 req_dma; |
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u64 rsp_dma; |
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struct ib_sge sge; |
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struct ib_cqe cqe; |
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} __packed; |
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struct iser_conn; |
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struct ib_conn; |
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struct iscsi_iser_task; |
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/** |
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* struct iser_device - iSER device handle |
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* |
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* @ib_device: RDMA device |
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* @pd: Protection Domain for this device |
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* @mr: Global DMA memory region |
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* @event_handler: IB events handle routine |
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* @ig_list: entry in devices list |
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* @refcount: Reference counter, dominated by open iser connections |
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*/ |
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struct iser_device { |
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struct ib_device *ib_device; |
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struct ib_pd *pd; |
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struct ib_event_handler event_handler; |
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struct list_head ig_list; |
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int refcount; |
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}; |
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/** |
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* struct iser_reg_resources - Fast registration resources |
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* |
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* @mr: memory region |
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* @sig_mr: signature memory region |
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* @mr_valid: is mr valid indicator |
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*/ |
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struct iser_reg_resources { |
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struct ib_mr *mr; |
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struct ib_mr *sig_mr; |
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u8 mr_valid:1; |
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}; |
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/** |
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* struct iser_fr_desc - Fast registration descriptor |
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* |
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* @list: entry in connection fastreg pool |
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* @rsc: data buffer registration resources |
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* @sig_protected: is region protected indicator |
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* @all_list: first and last list members |
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*/ |
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struct iser_fr_desc { |
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struct list_head list; |
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struct iser_reg_resources rsc; |
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bool sig_protected; |
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struct list_head all_list; |
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}; |
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/** |
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* struct iser_fr_pool - connection fast registration pool |
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* |
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* @list: list of fastreg descriptors |
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* @lock: protects fastreg pool |
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* @size: size of the pool |
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* @all_list: first and last list members |
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*/ |
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struct iser_fr_pool { |
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struct list_head list; |
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spinlock_t lock; |
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int size; |
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struct list_head all_list; |
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}; |
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/** |
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* struct ib_conn - Infiniband related objects |
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* |
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* @cma_id: rdma_cm connection maneger handle |
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* @qp: Connection Queue-pair |
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* @cq: Connection completion queue |
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* @cq_size: The number of max outstanding completions |
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* @post_recv_buf_count: post receive counter |
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* @sig_count: send work request signal count |
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* @rx_wr: receive work request for batch posts |
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* @device: reference to iser device |
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* @fr_pool: connection fast registration poool |
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* @pi_support: Indicate device T10-PI support |
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* @reg_cqe: completion handler |
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*/ |
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struct ib_conn { |
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struct rdma_cm_id *cma_id; |
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struct ib_qp *qp; |
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struct ib_cq *cq; |
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u32 cq_size; |
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int post_recv_buf_count; |
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u8 sig_count; |
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struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX]; |
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struct iser_device *device; |
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struct iser_fr_pool fr_pool; |
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bool pi_support; |
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struct ib_cqe reg_cqe; |
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}; |
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/** |
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* struct iser_conn - iSER connection context |
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* |
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* @ib_conn: connection RDMA resources |
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* @iscsi_conn: link to matching iscsi connection |
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* @ep: transport handle |
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* @state: connection logical state |
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* @qp_max_recv_dtos: maximum number of data outs, corresponds |
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* to max number of post recvs |
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* @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1) |
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* @min_posted_rx: (qp_max_recv_dtos >> 2) |
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* @max_cmds: maximum cmds allowed for this connection |
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* @name: connection peer portal |
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* @release_work: deffered work for release job |
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* @state_mutex: protects iser onnection state |
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* @stop_completion: conn_stop completion |
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* @ib_completion: RDMA cleanup completion |
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* @up_completion: connection establishment completed |
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* (state is ISER_CONN_UP) |
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* @conn_list: entry in ig conn list |
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* @login_desc: login descriptor |
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* @rx_desc_head: head of rx_descs cyclic buffer |
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* @rx_descs: rx buffers array (cyclic buffer) |
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* @num_rx_descs: number of rx descriptors |
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* @scsi_sg_tablesize: scsi host sg_tablesize |
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* @pages_per_mr: maximum pages available for registration |
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* @snd_w_inv: connection uses remote invalidation |
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*/ |
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struct iser_conn { |
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struct ib_conn ib_conn; |
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struct iscsi_conn *iscsi_conn; |
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struct iscsi_endpoint *ep; |
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enum iser_conn_state state; |
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unsigned qp_max_recv_dtos; |
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unsigned qp_max_recv_dtos_mask; |
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unsigned min_posted_rx; |
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u16 max_cmds; |
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char name[ISER_OBJECT_NAME_SIZE]; |
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struct work_struct release_work; |
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struct mutex state_mutex; |
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struct completion stop_completion; |
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struct completion ib_completion; |
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struct completion up_completion; |
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struct list_head conn_list; |
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struct iser_login_desc login_desc; |
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unsigned int rx_desc_head; |
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struct iser_rx_desc *rx_descs; |
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u32 num_rx_descs; |
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unsigned short scsi_sg_tablesize; |
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unsigned short pages_per_mr; |
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bool snd_w_inv; |
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}; |
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/** |
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* struct iscsi_iser_task - iser task context |
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* |
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* @desc: TX descriptor |
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* @iser_conn: link to iser connection |
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* @status: current task status |
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* @sc: link to scsi command |
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* @command_sent: indicate if command was sent |
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* @dir: iser data direction |
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* @rdma_reg: task rdma registration desc |
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* @data: iser data buffer desc |
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* @prot: iser protection buffer desc |
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*/ |
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struct iscsi_iser_task { |
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struct iser_tx_desc desc; |
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struct iser_conn *iser_conn; |
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enum iser_task_status status; |
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struct scsi_cmnd *sc; |
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int command_sent; |
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int dir[ISER_DIRS_NUM]; |
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struct iser_mem_reg rdma_reg[ISER_DIRS_NUM]; |
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struct iser_data_buf data[ISER_DIRS_NUM]; |
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struct iser_data_buf prot[ISER_DIRS_NUM]; |
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}; |
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/** |
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* struct iser_global - iSER global context |
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* |
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* @device_list_mutex: protects device_list |
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* @device_list: iser devices global list |
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* @connlist_mutex: protects connlist |
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* @connlist: iser connections global list |
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* @desc_cache: kmem cache for tx dataout |
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*/ |
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struct iser_global { |
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struct mutex device_list_mutex; |
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struct list_head device_list; |
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struct mutex connlist_mutex; |
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struct list_head connlist; |
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struct kmem_cache *desc_cache; |
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}; |
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extern struct iser_global ig; |
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extern int iser_debug_level; |
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extern bool iser_pi_enable; |
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extern int iser_pi_guard; |
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extern unsigned int iser_max_sectors; |
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extern bool iser_always_reg; |
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int iser_send_control(struct iscsi_conn *conn, |
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struct iscsi_task *task); |
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int iser_send_command(struct iscsi_conn *conn, |
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struct iscsi_task *task); |
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int iser_send_data_out(struct iscsi_conn *conn, |
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struct iscsi_task *task, |
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struct iscsi_data *hdr); |
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void iscsi_iser_recv(struct iscsi_conn *conn, |
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struct iscsi_hdr *hdr, |
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char *rx_data, |
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int rx_data_len); |
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void iser_conn_init(struct iser_conn *iser_conn); |
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void iser_conn_release(struct iser_conn *iser_conn); |
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int iser_conn_terminate(struct iser_conn *iser_conn); |
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void iser_release_work(struct work_struct *work); |
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void iser_err_comp(struct ib_wc *wc, const char *type); |
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void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc); |
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void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc); |
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void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc); |
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void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc); |
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void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc); |
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void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc); |
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void iser_task_rdma_init(struct iscsi_iser_task *task); |
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void iser_task_rdma_finalize(struct iscsi_iser_task *task); |
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void iser_free_rx_descriptors(struct iser_conn *iser_conn); |
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void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task, |
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struct iser_data_buf *mem, |
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enum iser_data_dir cmd_dir); |
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|
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int iser_reg_mem_fastreg(struct iscsi_iser_task *task, |
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enum iser_data_dir dir, |
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bool all_imm); |
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void iser_unreg_mem_fastreg(struct iscsi_iser_task *task, |
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enum iser_data_dir dir); |
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|
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int iser_connect(struct iser_conn *iser_conn, |
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struct sockaddr *src_addr, |
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struct sockaddr *dst_addr, |
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int non_blocking); |
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|
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int iser_post_recvl(struct iser_conn *iser_conn); |
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int iser_post_recvm(struct iser_conn *iser_conn, int count); |
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int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc, |
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bool signal); |
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|
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int iser_dma_map_task_data(struct iscsi_iser_task *iser_task, |
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struct iser_data_buf *data, |
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enum iser_data_dir iser_dir, |
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enum dma_data_direction dma_dir); |
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|
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void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task, |
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struct iser_data_buf *data, |
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enum dma_data_direction dir); |
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|
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int iser_initialize_task_headers(struct iscsi_task *task, |
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struct iser_tx_desc *tx_desc); |
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int iser_alloc_rx_descriptors(struct iser_conn *iser_conn, |
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struct iscsi_session *session); |
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int iser_alloc_fastreg_pool(struct ib_conn *ib_conn, |
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unsigned cmds_max, |
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unsigned int size); |
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void iser_free_fastreg_pool(struct ib_conn *ib_conn); |
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u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, |
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enum iser_data_dir cmd_dir, sector_t *sector); |
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|
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static inline struct iser_conn * |
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to_iser_conn(struct ib_conn *ib_conn) |
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{ |
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return container_of(ib_conn, struct iser_conn, ib_conn); |
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} |
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|
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static inline struct iser_rx_desc * |
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iser_rx(struct ib_cqe *cqe) |
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{ |
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return container_of(cqe, struct iser_rx_desc, cqe); |
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} |
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|
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static inline struct iser_tx_desc * |
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iser_tx(struct ib_cqe *cqe) |
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{ |
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return container_of(cqe, struct iser_tx_desc, cqe); |
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} |
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|
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static inline struct iser_login_desc * |
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iser_login(struct ib_cqe *cqe) |
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{ |
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return container_of(cqe, struct iser_login_desc, cqe); |
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} |
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|
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#endif
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