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704315f082
linux/drivers/infiniband/ulp/iser/iscsi_iser.h
Or Gerlitz 704315f082 IB/iser: Remove atomic counter for posted receive buffers 
Now that both the posting and reaping of receive buffers is done in
the completion path, the counter of outstanding buffers not be atomic.

Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
2010-02-24 09:41:11 -08:00

395 lines
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C
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/*
* 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.
*
* 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 <scsi/libiscsi.h>
#include <scsi/scsi_transport_iscsi.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 "0.1"
#define DRV_DATE "May 7th, 2006"
#define iser_dbg(fmt, arg...) \
do { \
if (iser_debug_level > 1) \
printk(KERN_DEBUG PFX "%s:" fmt,\
__func__ , ## arg); \
} while (0)
#define iser_warn(fmt, arg...) \
do { \
if (iser_debug_level > 0) \
printk(KERN_DEBUG 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 (1UL << SHIFT_4K)
#define MASK_4K (~(SIZE_4K-1))
/* support upto 512KB in one RDMA */
#define ISCSI_ISER_SG_TABLESIZE (0x80000 >> SHIFT_4K)
#define ISER_DEF_CMD_PER_LUN 128
/* 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));
/* 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 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 */
u64 dma_addr; /* if non zero, addr for dma_unmap */
enum dma_data_direction direction; /* direction for dma_unmap */
unsigned int data_size;
atomic_t ref_count; /* refcount, freed when dec to 0 */
};
#define MAX_REGD_BUF_VECTOR_LEN 2
struct iser_dto {
struct iscsi_iser_task *task;
struct iser_conn *ib_conn;
int notify_enable;
/* vector of registered buffers */
unsigned int regd_vector_len;
struct iser_regd_buf *regd[MAX_REGD_BUF_VECTOR_LEN];
/* offset into the registered buffer may be specified */
unsigned int offset[MAX_REGD_BUF_VECTOR_LEN];
/* a smaller size may be specified, if 0, then full size is used */
unsigned int used_sz[MAX_REGD_BUF_VECTOR_LEN];
};
enum iser_desc_type {
ISCSI_TX_CONTROL ,
ISCSI_TX_SCSI_COMMAND,
ISCSI_TX_DATAOUT
};
struct iser_desc {
struct iser_hdr iser_header;
struct iscsi_hdr iscsi_header;
struct iser_regd_buf hdr_regd_buf;
void *data; /* used by RX & TX_CONTROL */
struct iser_regd_buf data_regd_buf; /* used by RX & TX_CONTROL */
enum iser_desc_type type;
struct iser_dto dto;
};
#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));
struct iser_device {
struct ib_device *ib_device;
struct ib_pd *pd;
struct ib_cq *cq;
struct ib_mr *mr;
struct tasklet_struct cq_tasklet;
struct list_head ig_list; /* entry in ig devices list */
int refcount;
};
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 */
int disc_evt_flag; /* disconn event delivered */
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;
u64 login_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_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_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);
void iser_conn_put(struct iser_conn *ib_conn);
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_desc *desc);
void iser_task_rdma_init(struct iscsi_iser_task *task);
void iser_task_rdma_finalize(struct iscsi_iser_task *task);
void iser_dto_buffs_release(struct iser_dto *dto);
int iser_regd_buff_release(struct iser_regd_buf *regd_buf);
void iser_free_rx_descriptors(struct iser_conn *ib_conn);
void iser_reg_single(struct iser_device *device,
struct iser_regd_buf *regd_buf,
enum dma_data_direction direction);
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_desc *tx_desc);
int iser_conn_state_comp(struct iser_conn *ib_conn,
enum iser_ib_conn_state comp);
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);
#endif
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