372 lines
12 KiB
C
372 lines
12 KiB
C
/*
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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 open-iscsi@googlegroups.com
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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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*
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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 <scsi/libiscsi.h>
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#include <scsi/scsi_transport_iscsi.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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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/ib_fmr_pool.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 "0.1"
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#define DRV_DATE "May 7th, 2006"
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#define iser_dbg(fmt, arg...) \
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do { \
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if (iser_debug_level > 1) \
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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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#define iser_warn(fmt, arg...) \
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do { \
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if (iser_debug_level > 0) \
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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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#define iser_err(fmt, arg...) \
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do { \
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printk(KERN_ERR PFX "%s:" fmt, \
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__func__ , ## arg); \
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} while (0)
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#define SHIFT_4K 12
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#define SIZE_4K (1UL << SHIFT_4K)
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#define MASK_4K (~(SIZE_4K-1))
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/* support upto 512KB in one RDMA */
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#define ISCSI_ISER_SG_TABLESIZE (0x80000 >> SHIFT_4K)
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#define ISCSI_ISER_MAX_LUN 256
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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 (ISCSI_DEF_XMIT_CMDS_MAX + \
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ISER_MAX_RX_MISC_PDUS + \
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ISER_MAX_TX_MISC_PDUS)
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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 (ISCSI_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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#define ISER_VER 0x10
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#define ISER_WSV 0x08
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#define ISER_RSV 0x04
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struct iser_hdr {
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u8 flags;
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u8 rsvd[3];
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__be32 write_stag; /* write rkey */
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__be64 write_va;
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__be32 read_stag; /* read rkey */
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__be64 read_va;
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} __attribute__((packed));
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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_ib_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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struct iser_data_buf {
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void *buf; /* pointer to the sg list */
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unsigned int size; /* num entries of this sg */
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unsigned long data_len; /* total data len */
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unsigned int dma_nents; /* returned by dma_map_sg */
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char *copy_buf; /* allocated copy buf for SGs unaligned *
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* for rdma which are copied */
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struct scatterlist sg_single; /* SG-ified clone of a non SG SC or *
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* unaligned SG */
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};
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/* fwd declarations */
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struct iser_device;
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struct iscsi_iser_conn;
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struct iscsi_iser_task;
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struct iscsi_endpoint;
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struct iser_mem_reg {
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u32 lkey;
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u32 rkey;
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u64 va;
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u64 len;
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void *mem_h;
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int is_fmr;
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};
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struct iser_regd_buf {
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struct iser_mem_reg reg; /* memory registration info */
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void *virt_addr;
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struct iser_device *device; /* device->device for dma_unmap */
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u64 dma_addr; /* if non zero, addr for dma_unmap */
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enum dma_data_direction direction; /* direction for dma_unmap */
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unsigned int data_size;
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atomic_t ref_count; /* refcount, freed when dec to 0 */
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};
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#define MAX_REGD_BUF_VECTOR_LEN 2
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struct iser_dto {
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struct iscsi_iser_task *task;
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struct iser_conn *ib_conn;
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int notify_enable;
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/* vector of registered buffers */
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unsigned int regd_vector_len;
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struct iser_regd_buf *regd[MAX_REGD_BUF_VECTOR_LEN];
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/* offset into the registered buffer may be specified */
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unsigned int offset[MAX_REGD_BUF_VECTOR_LEN];
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/* a smaller size may be specified, if 0, then full size is used */
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unsigned int used_sz[MAX_REGD_BUF_VECTOR_LEN];
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};
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enum iser_desc_type {
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ISCSI_RX,
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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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struct iser_desc {
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struct iser_hdr iser_header;
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struct iscsi_hdr iscsi_header;
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struct iser_regd_buf hdr_regd_buf;
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void *data; /* used by RX & TX_CONTROL */
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struct iser_regd_buf data_regd_buf; /* used by RX & TX_CONTROL */
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enum iser_desc_type type;
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struct iser_dto dto;
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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_cq *cq;
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struct ib_mr *mr;
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struct tasklet_struct cq_tasklet;
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struct list_head ig_list; /* entry in ig devices list */
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int refcount;
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};
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struct iser_conn {
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struct iscsi_iser_conn *iser_conn; /* iser conn for upcalls */
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struct iscsi_endpoint *ep;
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enum iser_ib_conn_state state; /* rdma connection state */
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atomic_t refcount;
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spinlock_t lock; /* used for state changes */
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struct iser_device *device; /* device context */
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struct rdma_cm_id *cma_id; /* CMA ID */
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struct ib_qp *qp; /* QP */
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struct ib_fmr_pool *fmr_pool; /* pool of IB FMRs */
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int disc_evt_flag; /* disconn event delivered */
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wait_queue_head_t wait; /* waitq for conn/disconn */
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atomic_t post_recv_buf_count; /* posted rx count */
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atomic_t post_send_buf_count; /* posted tx count */
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atomic_t unexpected_pdu_count;/* count of received *
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* unexpected pdus *
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* not yet retired */
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char name[ISER_OBJECT_NAME_SIZE];
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struct iser_page_vec *page_vec; /* represents SG to fmr maps*
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* maps serialized as tx is*/
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struct list_head conn_list; /* entry in ig conn list */
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};
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struct iscsi_iser_conn {
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struct iscsi_conn *iscsi_conn;/* ptr to iscsi conn */
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struct iser_conn *ib_conn; /* iSER IB conn */
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};
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struct iscsi_iser_task {
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struct iser_desc desc;
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struct iscsi_iser_conn *iser_conn;
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enum iser_task_status status;
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int command_sent; /* set if command sent */
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int dir[ISER_DIRS_NUM]; /* set if dir use*/
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struct iser_regd_buf rdma_regd[ISER_DIRS_NUM];/* regd rdma buf */
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struct iser_data_buf data[ISER_DIRS_NUM]; /* orig. data des*/
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struct iser_data_buf data_copy[ISER_DIRS_NUM];/* contig. copy */
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};
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struct iser_page_vec {
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u64 *pages;
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int length;
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int offset;
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int data_size;
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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; /* all iSER devices */
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struct mutex connlist_mutex;
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struct list_head connlist; /* all iSER IB connections */
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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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/* allocate connection resources needed for rdma functionality */
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int iser_conn_set_full_featured_mode(struct iscsi_conn *conn);
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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 *ib_conn);
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void iser_conn_get(struct iser_conn *ib_conn);
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void iser_conn_put(struct iser_conn *ib_conn);
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void iser_conn_terminate(struct iser_conn *ib_conn);
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void iser_rcv_completion(struct iser_desc *desc,
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unsigned long dto_xfer_len);
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void iser_snd_completion(struct iser_desc *desc);
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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_dto_buffs_release(struct iser_dto *dto);
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int iser_regd_buff_release(struct iser_regd_buf *regd_buf);
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void iser_reg_single(struct iser_device *device,
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struct iser_regd_buf *regd_buf,
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enum dma_data_direction direction);
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void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *task,
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enum iser_data_dir cmd_dir);
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int iser_reg_rdma_mem(struct iscsi_iser_task *task,
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enum iser_data_dir cmd_dir);
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int iser_connect(struct iser_conn *ib_conn,
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struct sockaddr_in *src_addr,
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struct sockaddr_in *dst_addr,
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int non_blocking);
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int iser_reg_page_vec(struct iser_conn *ib_conn,
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struct iser_page_vec *page_vec,
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struct iser_mem_reg *mem_reg);
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void iser_unreg_mem(struct iser_mem_reg *mem_reg);
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int iser_post_recv(struct iser_desc *rx_desc);
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int iser_post_send(struct iser_desc *tx_desc);
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int iser_conn_state_comp(struct iser_conn *ib_conn,
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enum iser_ib_conn_state comp);
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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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void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task);
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#endif
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