/*
* iSER transport for the Open iSCSI Initiator & iSER transport internals
*
* Copyright (C) 2004 Dmitry Yusupov
* Copyright (C) 2004 Alex Aizman
* Copyright (C) 2005 Mike Christie
* based on code maintained by open-iscsi@googlegroups.com
*
* Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
* Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
* Copyright (c) 2013 Mellanox Technologies. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef __ISCSI_ISER_H__
#define __ISCSI_ISER_H__
#include <linux/types.h>
#include <linux/net.h>
#include <linux/printk.h>
#include <scsi/libiscsi.h>
#include <scsi/scsi_transport_iscsi.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/mutex.h>
#include <linux/mempool.h>
#include <linux/uio.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_fmr_pool.h>
#include <rdma/rdma_cm.h>
#define DRV_NAME "iser"
#define PFX DRV_NAME ": "
#define DRV_VER "1.1"
#define iser_dbg(fmt, arg...) \
do { \
if (iser_debug_level > 2) \
printk(KERN_DEBUG PFX "%s:" fmt,\
__func__ , ## arg); \
} while (0)
#define iser_warn(fmt, arg...) \
do { \
if (iser_debug_level > 1) \
pr_warn(PFX "%s:" fmt, \
__func__ , ## arg); \
} while (0)
#define iser_info(fmt, arg...) \
do { \
if (iser_debug_level > 0) \
pr_info(PFX "%s:" fmt, \
__func__ , ## arg); \
} while (0)
#define iser_err(fmt, arg...) \
do { \
printk(KERN_ERR PFX "%s:" fmt, \
__func__ , ## arg); \
} while (0)
#define SHIFT_4K 12
#define SIZE_4K (1ULL << SHIFT_4K)
#define MASK_4K (~(SIZE_4K-1))
/* support up to 512KB in one RDMA */
#define ISCSI_ISER_SG_TABLESIZE (0x80000 >> SHIFT_4K)
#define ISER_DEF_CMD_PER_LUN ISCSI_DEF_XMIT_CMDS_MAX
/* QP settings */
/* Maximal bounds on received asynchronous PDUs */
#define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */
#define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), *
* SCSI_TMFUNC(2), LOGOUT(1) */
#define ISER_QP_MAX_RECV_DTOS (ISCSI_DEF_XMIT_CMDS_MAX)
#define ISER_MIN_POSTED_RX (ISCSI_DEF_XMIT_CMDS_MAX >> 2)
/* the max TX (send) WR supported by the iSER QP is defined by *
* max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect *
* to have at max for SCSI command. The tx posting & completion handling code *
* supports -EAGAIN scheme where tx is suspended till the QP has room for more *
* send WR. D=8 comes from 64K/8K */
#define ISER_INFLIGHT_DATAOUTS 8
#define ISER_QP_MAX_REQ_DTOS (ISCSI_DEF_XMIT_CMDS_MAX * \
(1 + ISER_INFLIGHT_DATAOUTS) + \
ISER_MAX_TX_MISC_PDUS + \
ISER_MAX_RX_MISC_PDUS)
#define ISER_VER 0x10
#define ISER_WSV 0x08
#define ISER_RSV 0x04
struct iser_hdr {
u8 flags;
u8 rsvd[3];
__be32 write_stag; /* write rkey */
__be64 write_va;
__be32 read_stag; /* read rkey */
__be64 read_va;
} __attribute__((packed));
#define ISER_ZBVA_NOT_SUPPORTED 0x80
#define ISER_SEND_W_INV_NOT_SUPPORTED 0x40
struct iser_cm_hdr {
u8 flags;
u8 rsvd[3];
} __packed;
/* Constant PDU lengths calculations */
#define ISER_HEADERS_LEN (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr))
#define ISER_RECV_DATA_SEG_LEN 128
#define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
#define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
/* Length of an object name string */
#define ISER_OBJECT_NAME_SIZE 64
enum iser_ib_conn_state {
ISER_CONN_INIT, /* descriptor allocd, no conn */
ISER_CONN_PENDING, /* in the process of being established */
ISER_CONN_UP, /* up and running */
ISER_CONN_TERMINATING, /* in the process of being terminated */
ISER_CONN_DOWN, /* shut down */
ISER_CONN_STATES_NUM
};
enum iser_task_status {
ISER_TASK_STATUS_INIT = 0,
ISER_TASK_STATUS_STARTED,
ISER_TASK_STATUS_COMPLETED
};
enum iser_data_dir {
ISER_DIR_IN = 0, /* to initiator */
ISER_DIR_OUT, /* from initiator */
ISER_DIRS_NUM
};
struct iser_data_buf {
void *buf; /* pointer to the sg list */
unsigned int size; /* num entries of this sg */
unsigned long data_len; /* total data len */
unsigned int dma_nents; /* returned by dma_map_sg */
char *copy_buf; /* allocated copy buf for SGs unaligned *
* for rdma which are copied */
struct scatterlist sg_single; /* SG-ified clone of a non SG SC or *
* unaligned SG */
};
/* fwd declarations */
struct iser_device;
struct iser_cq_desc;
struct iscsi_iser_conn;
struct iscsi_iser_task;
struct iscsi_endpoint;
struct iser_mem_reg {
u32 lkey;
u32 rkey;
u64 va;
u64 len;
void *mem_h;
int is_fmr;
};
struct iser_regd_buf {
struct iser_mem_reg reg; /* memory registration info */
void *virt_addr;
struct iser_device *device; /* device->device for dma_unmap */
enum dma_data_direction direction; /* direction for dma_unmap */
unsigned int data_size;
};
enum iser_desc_type {
ISCSI_TX_CONTROL ,
ISCSI_TX_SCSI_COMMAND,
ISCSI_TX_DATAOUT
};
struct iser_tx_desc {
struct iser_hdr iser_header;
struct iscsi_hdr iscsi_header;
enum iser_desc_type type;
u64 dma_addr;
/* sg[0] points to iser/iscsi headers, sg[1] optionally points to either
of immediate data, unsolicited data-out or control (login,text) */
struct ib_sge tx_sg[2];
int num_sge;
};
#define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \
sizeof(u64) + sizeof(struct ib_sge)))
struct iser_rx_desc {
struct iser_hdr iser_header;
struct iscsi_hdr iscsi_header;
char data[ISER_RECV_DATA_SEG_LEN];
u64 dma_addr;
struct ib_sge rx_sg;
char pad[ISER_RX_PAD_SIZE];
} __attribute__((packed));
#define ISER_MAX_CQ 4
struct iser_device {
struct ib_device *ib_device;
struct ib_pd *pd;
struct ib_cq *rx_cq[ISER_MAX_CQ];
struct ib_cq *tx_cq[ISER_MAX_CQ];
struct ib_mr *mr;
struct tasklet_struct cq_tasklet[ISER_MAX_CQ];
struct ib_event_handler event_handler;
struct list_head ig_list; /* entry in ig devices list */
int refcount;
int cq_active_qps[ISER_MAX_CQ];
int cqs_used;
struct iser_cq_desc *cq_desc;
};
struct iser_conn {
struct iscsi_iser_conn *iser_conn; /* iser conn for upcalls */
struct iscsi_endpoint *ep;
enum iser_ib_conn_state state; /* rdma connection state */
atomic_t refcount;
spinlock_t lock; /* used for state changes */
struct iser_device *device; /* device context */
struct rdma_cm_id *cma_id; /* CMA ID */
struct ib_qp *qp; /* QP */
struct ib_fmr_pool *fmr_pool; /* pool of IB FMRs */
wait_queue_head_t wait; /* waitq for conn/disconn */
int post_recv_buf_count; /* posted rx count */
atomic_t post_send_buf_count; /* posted tx count */
char name[ISER_OBJECT_NAME_SIZE];
struct iser_page_vec *page_vec; /* represents SG to fmr maps*
* maps serialized as tx is*/
struct list_head conn_list; /* entry in ig conn list */
char *login_buf;
char *login_req_buf, *login_resp_buf;
u64 login_req_dma, login_resp_dma;
unsigned int rx_desc_head;
struct iser_rx_desc *rx_descs;
struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX];
};
struct iscsi_iser_conn {
struct iscsi_conn *iscsi_conn;/* ptr to iscsi conn */
struct iser_conn *ib_conn; /* iSER IB conn */
};
struct iscsi_iser_task {
struct iser_tx_desc desc;
struct iscsi_iser_conn *iser_conn;
enum iser_task_status status;
int command_sent; /* set if command sent */
int dir[ISER_DIRS_NUM]; /* set if dir use*/
struct iser_regd_buf rdma_regd[ISER_DIRS_NUM];/* regd rdma buf */
struct iser_data_buf data[ISER_DIRS_NUM]; /* orig. data des*/
struct iser_data_buf data_copy[ISER_DIRS_NUM];/* contig. copy */
};
struct iser_page_vec {
u64 *pages;
int length;
int offset;
int data_size;
};
struct iser_cq_desc {
struct iser_device *device;
int cq_index;
};
struct iser_global {
struct mutex device_list_mutex;/* */
struct list_head device_list; /* all iSER devices */
struct mutex connlist_mutex;
struct list_head connlist; /* all iSER IB connections */
struct kmem_cache *desc_cache;
};
extern struct iser_global ig;
extern int iser_debug_level;
/* allocate connection resources needed for rdma functionality */
int iser_conn_set_full_featured_mode(struct iscsi_conn *conn);
int iser_send_control(struct iscsi_conn *conn,
struct iscsi_task *task);
int iser_send_command(struct iscsi_conn *conn,
struct iscsi_task *task);
int iser_send_data_out(struct iscsi_conn *conn,
struct iscsi_task *task,
struct iscsi_data *hdr);
void iscsi_iser_recv(struct iscsi_conn *conn,
struct iscsi_hdr *hdr,
char *rx_data,
int rx_data_len);
void iser_conn_init(struct iser_conn *ib_conn);
void iser_conn_get(struct iser_conn *ib_conn);
int iser_conn_put(struct iser_conn *ib_conn, int destroy_cma_id_allowed);
void iser_conn_terminate(struct iser_conn *ib_conn);
void iser_rcv_completion(struct iser_rx_desc *desc,
unsigned long dto_xfer_len,
struct iser_conn *ib_conn);
void iser_snd_completion(struct iser_tx_desc *desc, struct iser_conn *ib_conn);
void iser_task_rdma_init(struct iscsi_iser_task *task);
void iser_task_rdma_finalize(struct iscsi_iser_task *task);
void iser_free_rx_descriptors(struct iser_conn *ib_conn);
void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *task,
enum iser_data_dir cmd_dir);
int iser_reg_rdma_mem(struct iscsi_iser_task *task,
enum iser_data_dir cmd_dir);
int iser_connect(struct iser_conn *ib_conn,
struct sockaddr_in *src_addr,
struct sockaddr_in *dst_addr,
int non_blocking);
int iser_reg_page_vec(struct iser_conn *ib_conn,
struct iser_page_vec *page_vec,
struct iser_mem_reg *mem_reg);
void iser_unreg_mem(struct iser_mem_reg *mem_reg);
int iser_post_recvl(struct iser_conn *ib_conn);
int iser_post_recvm(struct iser_conn *ib_conn, int count);
int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc);
int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
struct iser_data_buf *data,
enum iser_data_dir iser_dir,
enum dma_data_direction dma_dir);
void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task);
int iser_initialize_task_headers(struct iscsi_task *task,
struct iser_tx_desc *tx_desc);
int iser_alloc_rx_descriptors(struct iser_conn *ib_conn);
#endif