[net-next-2.6.git] / net / rds / iw.h

#ifndef _RDS_IW_H
#define _RDS_IW_H

#include <rdma/ib_verbs.h>
#include <rdma/rdma_cm.h>
#include "rds.h"
#include "rdma_transport.h"

#define RDS_FASTREG_SIZE		20
#define RDS_FASTREG_POOL_SIZE		2048

#define RDS_IW_MAX_SGE			8
#define RDS_IW_RECV_SGE 		2

#define RDS_IW_DEFAULT_RECV_WR		1024
#define RDS_IW_DEFAULT_SEND_WR		256

#define RDS_IW_SUPPORTED_PROTOCOLS	0x00000003	/* minor versions supported */

extern struct list_head rds_iw_devices;

/*
 * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
 * try and minimize the amount of memory tied up both the device and
 * socket receive queues.
 */
/* page offset of the final full frag that fits in the page */
#define RDS_PAGE_LAST_OFF (((PAGE_SIZE  / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE)
struct rds_page_frag {
	struct list_head	f_item;
	struct page		*f_page;
	unsigned long		f_offset;
	dma_addr_t 		f_mapped;
};

struct rds_iw_incoming {
	struct list_head	ii_frags;
	struct rds_incoming	ii_inc;
};

struct rds_iw_connect_private {
	/* Add new fields at the end, and don't permute existing fields. */
	__be32			dp_saddr;
	__be32			dp_daddr;
	u8			dp_protocol_major;
	u8			dp_protocol_minor;
	__be16			dp_protocol_minor_mask; /* bitmask */
	__be32			dp_reserved1;
	__be64			dp_ack_seq;
	__be32			dp_credit;		/* non-zero enables flow ctl */
};

struct rds_iw_scatterlist {
	struct scatterlist	*list;
	unsigned int		len;
	int			dma_len;
	unsigned int		dma_npages;
	unsigned int		bytes;
};

struct rds_iw_mapping {
	spinlock_t		m_lock;	/* protect the mapping struct */
	struct list_head	m_list;
	struct rds_iw_mr	*m_mr;
	uint32_t		m_rkey;
	struct rds_iw_scatterlist m_sg;
};

struct rds_iw_send_work {
	struct rds_message	*s_rm;

	/* We should really put these into a union: */
	struct rds_rdma_op	*s_op;
	struct rds_iw_mapping	*s_mapping;
	struct ib_mr		*s_mr;
	struct ib_fast_reg_page_list *s_page_list;
	unsigned char		s_remap_count;

	struct ib_send_wr	s_wr;
	struct ib_sge		s_sge[RDS_IW_MAX_SGE];
	unsigned long		s_queued;
};

struct rds_iw_recv_work {
	struct rds_iw_incoming 	*r_iwinc;
	struct rds_page_frag	*r_frag;
	struct ib_recv_wr	r_wr;
	struct ib_sge		r_sge[2];
};

struct rds_iw_work_ring {
	u32		w_nr;
	u32		w_alloc_ptr;
	u32		w_alloc_ctr;
	u32		w_free_ptr;
	atomic_t	w_free_ctr;
};

struct rds_iw_device;

struct rds_iw_connection {

	struct list_head	iw_node;
	struct rds_iw_device 	*rds_iwdev;
	struct rds_connection	*conn;

	/* alphabet soup, IBTA style */
	struct rdma_cm_id	*i_cm_id;
	struct ib_pd		*i_pd;
	struct ib_mr		*i_mr;
	struct ib_cq		*i_send_cq;
	struct ib_cq		*i_recv_cq;

	/* tx */
	struct rds_iw_work_ring	i_send_ring;
	struct rds_message	*i_rm;
	struct rds_header	*i_send_hdrs;
	u64			i_send_hdrs_dma;
	struct rds_iw_send_work *i_sends;

	/* rx */
	struct mutex		i_recv_mutex;
	struct rds_iw_work_ring	i_recv_ring;
	struct rds_iw_incoming	*i_iwinc;
	u32			i_recv_data_rem;
	struct rds_header	*i_recv_hdrs;
	u64			i_recv_hdrs_dma;
	struct rds_iw_recv_work *i_recvs;
	struct rds_page_frag	i_frag;
	u64			i_ack_recv;	/* last ACK received */

	/* sending acks */
	unsigned long		i_ack_flags;
	u64			i_ack_next;	/* next ACK to send */
	struct rds_header	*i_ack;
	struct ib_send_wr	i_ack_wr;
	struct ib_sge		i_ack_sge;
	u64			i_ack_dma;
	unsigned long		i_ack_queued;

	/* Flow control related information
	 *
	 * Our algorithm uses a pair variables that we need to access
	 * atomically - one for the send credits, and one posted
	 * recv credits we need to transfer to remote.
	 * Rather than protect them using a slow spinlock, we put both into
	 * a single atomic_t and update it using cmpxchg
	 */
	atomic_t		i_credits;

	/* Protocol version specific information */
	unsigned int		i_flowctl:1;	/* enable/disable flow ctl */
	unsigned int		i_dma_local_lkey:1;
	unsigned int		i_fastreg_posted:1; /* fastreg posted on this connection */
	/* Batched completions */
	unsigned int		i_unsignaled_wrs;
	long			i_unsignaled_bytes;
};

/* This assumes that atomic_t is at least 32 bits */
#define IB_GET_SEND_CREDITS(v)	((v) & 0xffff)
#define IB_GET_POST_CREDITS(v)	((v) >> 16)
#define IB_SET_SEND_CREDITS(v)	((v) & 0xffff)
#define IB_SET_POST_CREDITS(v)	((v) << 16)

struct rds_iw_cm_id {
	struct list_head	list;
	struct rdma_cm_id	*cm_id;
};

struct rds_iw_device {
	struct list_head	list;
	struct list_head	cm_id_list;
	struct list_head	conn_list;
	struct ib_device	*dev;
	struct ib_pd		*pd;
	struct ib_mr		*mr;
	struct rds_iw_mr_pool	*mr_pool;
	int			page_shift;
	int			max_sge;
	unsigned int		max_wrs;
	unsigned int		dma_local_lkey:1;
	spinlock_t		spinlock;	/* protect the above */
};

/* bits for i_ack_flags */
#define IB_ACK_IN_FLIGHT	0
#define IB_ACK_REQUESTED	1

/* Magic WR_ID for ACKs */
#define RDS_IW_ACK_WR_ID	((u64)0xffffffffffffffffULL)
#define RDS_IW_FAST_REG_WR_ID	((u64)0xefefefefefefefefULL)
#define RDS_IW_LOCAL_INV_WR_ID	((u64)0xdfdfdfdfdfdfdfdfULL)

struct rds_iw_statistics {
	uint64_t	s_iw_connect_raced;
	uint64_t	s_iw_listen_closed_stale;
	uint64_t	s_iw_tx_cq_call;
	uint64_t	s_iw_tx_cq_event;
	uint64_t	s_iw_tx_ring_full;
	uint64_t	s_iw_tx_throttle;
	uint64_t	s_iw_tx_sg_mapping_failure;
	uint64_t	s_iw_tx_stalled;
	uint64_t	s_iw_tx_credit_updates;
	uint64_t	s_iw_rx_cq_call;
	uint64_t	s_iw_rx_cq_event;
	uint64_t	s_iw_rx_ring_empty;
	uint64_t	s_iw_rx_refill_from_cq;
	uint64_t	s_iw_rx_refill_from_thread;
	uint64_t	s_iw_rx_alloc_limit;
	uint64_t	s_iw_rx_credit_updates;
	uint64_t	s_iw_ack_sent;
	uint64_t	s_iw_ack_send_failure;
	uint64_t	s_iw_ack_send_delayed;
	uint64_t	s_iw_ack_send_piggybacked;
	uint64_t	s_iw_ack_received;
	uint64_t	s_iw_rdma_mr_alloc;
	uint64_t	s_iw_rdma_mr_free;
	uint64_t	s_iw_rdma_mr_used;
	uint64_t	s_iw_rdma_mr_pool_flush;
	uint64_t	s_iw_rdma_mr_pool_wait;
	uint64_t	s_iw_rdma_mr_pool_depleted;
};

extern struct workqueue_struct *rds_iw_wq;

/*
 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
 * doesn't define it.
 */
static inline void rds_iw_dma_sync_sg_for_cpu(struct ib_device *dev,
		struct scatterlist *sg, unsigned int sg_dma_len, int direction)
{
	unsigned int i;

	for (i = 0; i < sg_dma_len; ++i) {
		ib_dma_sync_single_for_cpu(dev,
				ib_sg_dma_address(dev, &sg[i]),
				ib_sg_dma_len(dev, &sg[i]),
				direction);
	}
}
#define ib_dma_sync_sg_for_cpu	rds_iw_dma_sync_sg_for_cpu

static inline void rds_iw_dma_sync_sg_for_device(struct ib_device *dev,
		struct scatterlist *sg, unsigned int sg_dma_len, int direction)
{
	unsigned int i;

	for (i = 0; i < sg_dma_len; ++i) {
		ib_dma_sync_single_for_device(dev,
				ib_sg_dma_address(dev, &sg[i]),
				ib_sg_dma_len(dev, &sg[i]),
				direction);
	}
}
#define ib_dma_sync_sg_for_device	rds_iw_dma_sync_sg_for_device

static inline u32 rds_iw_local_dma_lkey(struct rds_iw_connection *ic)
{
	return ic->i_dma_local_lkey ? ic->i_cm_id->device->local_dma_lkey : ic->i_mr->lkey;
}

/* ib.c */
extern struct rds_transport rds_iw_transport;
extern void rds_iw_add_one(struct ib_device *device);
extern void rds_iw_remove_one(struct ib_device *device);
extern struct ib_client rds_iw_client;

extern unsigned int fastreg_pool_size;
extern unsigned int fastreg_message_size;

extern spinlock_t iw_nodev_conns_lock;
extern struct list_head iw_nodev_conns;

/* ib_cm.c */
int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp);
void rds_iw_conn_free(void *arg);
int rds_iw_conn_connect(struct rds_connection *conn);
void rds_iw_conn_shutdown(struct rds_connection *conn);
void rds_iw_state_change(struct sock *sk);
int __init rds_iw_listen_init(void);
void rds_iw_listen_stop(void);
void __rds_iw_conn_error(struct rds_connection *conn, const char *, ...);
int rds_iw_cm_handle_connect(struct rdma_cm_id *cm_id,
			     struct rdma_cm_event *event);
int rds_iw_cm_initiate_connect(struct rdma_cm_id *cm_id);
void rds_iw_cm_connect_complete(struct rds_connection *conn,
				struct rdma_cm_event *event);


#define rds_iw_conn_error(conn, fmt...) \
	__rds_iw_conn_error(conn, KERN_WARNING "RDS/IW: " fmt)

/* ib_rdma.c */
int rds_iw_update_cm_id(struct rds_iw_device *rds_iwdev, struct rdma_cm_id *cm_id);
int rds_iw_add_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn);
void rds_iw_remove_nodev_conns(void);
void rds_iw_remove_conns(struct rds_iw_device *rds_iwdev);
struct rds_iw_mr_pool *rds_iw_create_mr_pool(struct rds_iw_device *);
void rds_iw_get_mr_info(struct rds_iw_device *rds_iwdev, struct rds_info_rdma_connection *iinfo);
void rds_iw_destroy_mr_pool(struct rds_iw_mr_pool *);
void *rds_iw_get_mr(struct scatterlist *sg, unsigned long nents,
		    struct rds_sock *rs, u32 *key_ret);
void rds_iw_sync_mr(void *trans_private, int dir);
void rds_iw_free_mr(void *trans_private, int invalidate);
void rds_iw_flush_mrs(void);
void rds_iw_remove_cm_id(struct rds_iw_device *rds_iwdev, struct rdma_cm_id *cm_id);

/* ib_recv.c */
int __init rds_iw_recv_init(void);
void rds_iw_recv_exit(void);
int rds_iw_recv(struct rds_connection *conn);
int rds_iw_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
		       gfp_t page_gfp, int prefill);
void rds_iw_inc_purge(struct rds_incoming *inc);
void rds_iw_inc_free(struct rds_incoming *inc);
int rds_iw_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
			     size_t size);
void rds_iw_recv_cq_comp_handler(struct ib_cq *cq, void *context);
void rds_iw_recv_init_ring(struct rds_iw_connection *ic);
void rds_iw_recv_clear_ring(struct rds_iw_connection *ic);
void rds_iw_recv_init_ack(struct rds_iw_connection *ic);
void rds_iw_attempt_ack(struct rds_iw_connection *ic);
void rds_iw_ack_send_complete(struct rds_iw_connection *ic);
u64 rds_iw_piggyb_ack(struct rds_iw_connection *ic);

/* ib_ring.c */
void rds_iw_ring_init(struct rds_iw_work_ring *ring, u32 nr);
void rds_iw_ring_resize(struct rds_iw_work_ring *ring, u32 nr);
u32 rds_iw_ring_alloc(struct rds_iw_work_ring *ring, u32 val, u32 *pos);
void rds_iw_ring_free(struct rds_iw_work_ring *ring, u32 val);
void rds_iw_ring_unalloc(struct rds_iw_work_ring *ring, u32 val);
int rds_iw_ring_empty(struct rds_iw_work_ring *ring);
int rds_iw_ring_low(struct rds_iw_work_ring *ring);
u32 rds_iw_ring_oldest(struct rds_iw_work_ring *ring);
u32 rds_iw_ring_completed(struct rds_iw_work_ring *ring, u32 wr_id, u32 oldest);
extern wait_queue_head_t rds_iw_ring_empty_wait;

/* ib_send.c */
void rds_iw_xmit_complete(struct rds_connection *conn);
int rds_iw_xmit(struct rds_connection *conn, struct rds_message *rm,
		unsigned int hdr_off, unsigned int sg, unsigned int off);
void rds_iw_send_cq_comp_handler(struct ib_cq *cq, void *context);
void rds_iw_send_init_ring(struct rds_iw_connection *ic);
void rds_iw_send_clear_ring(struct rds_iw_connection *ic);
int rds_iw_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op);
void rds_iw_send_add_credits(struct rds_connection *conn, unsigned int credits);
void rds_iw_advertise_credits(struct rds_connection *conn, unsigned int posted);
int rds_iw_send_grab_credits(struct rds_iw_connection *ic, u32 wanted,
			     u32 *adv_credits, int need_posted);

/* ib_stats.c */
DECLARE_PER_CPU(struct rds_iw_statistics, rds_iw_stats);
#define rds_iw_stats_inc(member) rds_stats_inc_which(rds_iw_stats, member)
unsigned int rds_iw_stats_info_copy(struct rds_info_iterator *iter,
				    unsigned int avail);

/* ib_sysctl.c */
int __init rds_iw_sysctl_init(void);
void rds_iw_sysctl_exit(void);
extern unsigned long rds_iw_sysctl_max_send_wr;
extern unsigned long rds_iw_sysctl_max_recv_wr;
extern unsigned long rds_iw_sysctl_max_unsig_wrs;
extern unsigned long rds_iw_sysctl_max_unsig_bytes;
extern unsigned long rds_iw_sysctl_max_recv_allocation;
extern unsigned int rds_iw_sysctl_flow_control;
extern ctl_table rds_iw_sysctl_table[];

/*
 * Helper functions for getting/setting the header and data SGEs in
 * RDS packets (not RDMA)
 */
static inline struct ib_sge *
rds_iw_header_sge(struct rds_iw_connection *ic, struct ib_sge *sge)
{
	return &sge[0];
}

static inline struct ib_sge *
rds_iw_data_sge(struct rds_iw_connection *ic, struct ib_sge *sge)
{
	return &sge[1];
}

static inline void rds_iw_set_64bit(u64 *ptr, u64 val)
{
#if BITS_PER_LONG == 64
	*ptr = val;
#else
	set_64bit(ptr, val);
#endif
}

#endif
Commit	Line	Data
fcd8b7c0 AG	1	#ifndef _RDS_IW_H
	2	#define _RDS_IW_H
	3
	4	#include <rdma/ib_verbs.h>
	5	#include <rdma/rdma_cm.h>
	6	#include "rds.h"
	7	#include "rdma_transport.h"
	8
	9	#define RDS_FASTREG_SIZE 20
	10	#define RDS_FASTREG_POOL_SIZE 2048
	11
	12	#define RDS_IW_MAX_SGE 8
	13	#define RDS_IW_RECV_SGE 2
	14
	15	#define RDS_IW_DEFAULT_RECV_WR 1024
	16	#define RDS_IW_DEFAULT_SEND_WR 256
	17
	18	#define RDS_IW_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
	19
	20	extern struct list_head rds_iw_devices;
	21
	22	/*
	23	* IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
	24	* try and minimize the amount of memory tied up both the device and
	25	* socket receive queues.
	26	*/
	27	/* page offset of the final full frag that fits in the page */
	28	#define RDS_PAGE_LAST_OFF (((PAGE_SIZE / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE)
	29	struct rds_page_frag {
	30	struct list_head f_item;
	31	struct page *f_page;
	32	unsigned long f_offset;
	33	dma_addr_t f_mapped;
	34	};
	35
	36	struct rds_iw_incoming {
	37	struct list_head ii_frags;
	38	struct rds_incoming ii_inc;
	39	};
	40
	41	struct rds_iw_connect_private {
	42	/* Add new fields at the end, and don't permute existing fields. */
	43	__be32 dp_saddr;
	44	__be32 dp_daddr;
	45	u8 dp_protocol_major;
	46	u8 dp_protocol_minor;
	47	__be16 dp_protocol_minor_mask; /* bitmask */
	48	__be32 dp_reserved1;
	49	__be64 dp_ack_seq;
	50	__be32 dp_credit; /* non-zero enables flow ctl */
	51	};
	52
	53	struct rds_iw_scatterlist {
	54	struct scatterlist *list;
	55	unsigned int len;
	56	int dma_len;
	57	unsigned int dma_npages;
	58	unsigned int bytes;
	59	};
	60
	61	struct rds_iw_mapping {
	62	spinlock_t m_lock; /* protect the mapping struct */
	63	struct list_head m_list;
	64	struct rds_iw_mr *m_mr;
65	uint32_t m_rkey;
66	struct rds_iw_scatterlist m_sg;
67	};
68
69	struct rds_iw_send_work {
70	struct rds_message *s_rm;
71
72	/* We should really put these into a union: */
73	struct rds_rdma_op *s_op;
74	struct rds_iw_mapping *s_mapping;
75	struct ib_mr *s_mr;
76	struct ib_fast_reg_page_list *s_page_list;
77	unsigned char s_remap_count;
78
79	struct ib_send_wr s_wr;
80	struct ib_sge s_sge[RDS_IW_MAX_SGE];
81	unsigned long s_queued;
82	};
83
84	struct rds_iw_recv_work {
85	struct rds_iw_incoming *r_iwinc;
86	struct rds_page_frag *r_frag;
87	struct ib_recv_wr r_wr;
88	struct ib_sge r_sge[2];
89	};
90
91	struct rds_iw_work_ring {
92	u32 w_nr;
93	u32 w_alloc_ptr;
94	u32 w_alloc_ctr;
95	u32 w_free_ptr;
96	atomic_t w_free_ctr;
97	};
98
99	struct rds_iw_device;
100
101	struct rds_iw_connection {
102
103	struct list_head iw_node;
104	struct rds_iw_device *rds_iwdev;
105	struct rds_connection *conn;
106
107	/* alphabet soup, IBTA style */
108	struct rdma_cm_id *i_cm_id;
109	struct ib_pd *i_pd;
110	struct ib_mr *i_mr;
111	struct ib_cq *i_send_cq;
112	struct ib_cq *i_recv_cq;
113
114	/* tx */
115	struct rds_iw_work_ring i_send_ring;
116	struct rds_message *i_rm;
117	struct rds_header *i_send_hdrs;
118	u64 i_send_hdrs_dma;
119	struct rds_iw_send_work *i_sends;
120
121	/* rx */
122	struct mutex i_recv_mutex;
123	struct rds_iw_work_ring i_recv_ring;
124	struct rds_iw_incoming *i_iwinc;
125	u32 i_recv_data_rem;
126	struct rds_header *i_recv_hdrs;
127	u64 i_recv_hdrs_dma;
128	struct rds_iw_recv_work *i_recvs;
129	struct rds_page_frag i_frag;
130	u64 i_ack_recv; /* last ACK received */
131
132	/* sending acks */
133	unsigned long i_ack_flags;
134	u64 i_ack_next; /* next ACK to send */
135	struct rds_header *i_ack;
136	struct ib_send_wr i_ack_wr;
137	struct ib_sge i_ack_sge;
138	u64 i_ack_dma;
139	unsigned long i_ack_queued;
140
141	/* Flow control related information
142	*
143	* Our algorithm uses a pair variables that we need to access
144	* atomically - one for the send credits, and one posted
145	* recv credits we need to transfer to remote.
146	* Rather than protect them using a slow spinlock, we put both into
147	* a single atomic_t and update it using cmpxchg
148	*/
149	atomic_t i_credits;
150
151	/* Protocol version specific information */
152	unsigned int i_flowctl:1; /* enable/disable flow ctl */
153	unsigned int i_dma_local_lkey:1;
154	unsigned int i_fastreg_posted:1; /* fastreg posted on this connection */
155	/* Batched completions */
156	unsigned int i_unsignaled_wrs;
157	long i_unsignaled_bytes;
158	};
159
160	/* This assumes that atomic_t is at least 32 bits */
161	#define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
162	#define IB_GET_POST_CREDITS(v) ((v) >> 16)
163	#define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
164	#define IB_SET_POST_CREDITS(v) ((v) << 16)
165
166	struct rds_iw_cm_id {
167	struct list_head list;
168	struct rdma_cm_id *cm_id;
169	};
170
171	struct rds_iw_device {
172	struct list_head list;
173	struct list_head cm_id_list;
174	struct list_head conn_list;
175	struct ib_device *dev;
176	struct ib_pd *pd;
177	struct ib_mr *mr;
178	struct rds_iw_mr_pool *mr_pool;
179	int page_shift;
180	int max_sge;
181	unsigned int max_wrs;
182	unsigned int dma_local_lkey:1;
183	spinlock_t spinlock; /* protect the above */
184	};
185
186	/* bits for i_ack_flags */
187	#define IB_ACK_IN_FLIGHT 0
188	#define IB_ACK_REQUESTED 1
189
190	/* Magic WR_ID for ACKs */
191	#define RDS_IW_ACK_WR_ID ((u64)0xffffffffffffffffULL)
192	#define RDS_IW_FAST_REG_WR_ID ((u64)0xefefefefefefefefULL)
193	#define RDS_IW_LOCAL_INV_WR_ID ((u64)0xdfdfdfdfdfdfdfdfULL)
194
195	struct rds_iw_statistics {
196	uint64_t s_iw_connect_raced;
197	uint64_t s_iw_listen_closed_stale;
198	uint64_t s_iw_tx_cq_call;
199	uint64_t s_iw_tx_cq_event;
200	uint64_t s_iw_tx_ring_full;
201	uint64_t s_iw_tx_throttle;
202	uint64_t s_iw_tx_sg_mapping_failure;
203	uint64_t s_iw_tx_stalled;
204	uint64_t s_iw_tx_credit_updates;
205	uint64_t s_iw_rx_cq_call;
206	uint64_t s_iw_rx_cq_event;
207	uint64_t s_iw_rx_ring_empty;
208	uint64_t s_iw_rx_refill_from_cq;
209	uint64_t s_iw_rx_refill_from_thread;
210	uint64_t s_iw_rx_alloc_limit;
211	uint64_t s_iw_rx_credit_updates;
212	uint64_t s_iw_ack_sent;
213	uint64_t s_iw_ack_send_failure;
214	uint64_t s_iw_ack_send_delayed;
215	uint64_t s_iw_ack_send_piggybacked;
216	uint64_t s_iw_ack_received;
217	uint64_t s_iw_rdma_mr_alloc;
218	uint64_t s_iw_rdma_mr_free;
219	uint64_t s_iw_rdma_mr_used;
220	uint64_t s_iw_rdma_mr_pool_flush;
221	uint64_t s_iw_rdma_mr_pool_wait;
222	uint64_t s_iw_rdma_mr_pool_depleted;
223	};
224
225	extern struct workqueue_struct *rds_iw_wq;
226
227	/*
228	* Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
229	* doesn't define it.
230	*/
231	static inline void rds_iw_dma_sync_sg_for_cpu(struct ib_device *dev,
232	struct scatterlist *sg, unsigned int sg_dma_len, int direction)
233	{
234	unsigned int i;
235
236	for (i = 0; i < sg_dma_len; ++i) {
237	ib_dma_sync_single_for_cpu(dev,
238	ib_sg_dma_address(dev, &sg[i]),
239	ib_sg_dma_len(dev, &sg[i]),
240	direction);
241	}
242	}
243	#define ib_dma_sync_sg_for_cpu rds_iw_dma_sync_sg_for_cpu
244
245	static inline void rds_iw_dma_sync_sg_for_device(struct ib_device *dev,
246	struct scatterlist *sg, unsigned int sg_dma_len, int direction)
247	{
248	unsigned int i;
249
250	for (i = 0; i < sg_dma_len; ++i) {
251	ib_dma_sync_single_for_device(dev,
252	ib_sg_dma_address(dev, &sg[i]),
253	ib_sg_dma_len(dev, &sg[i]),
254	direction);
255	}
256	}
257	#define ib_dma_sync_sg_for_device rds_iw_dma_sync_sg_for_device
258
259	static inline u32 rds_iw_local_dma_lkey(struct rds_iw_connection *ic)
260	{
261	return ic->i_dma_local_lkey ? ic->i_cm_id->device->local_dma_lkey : ic->i_mr->lkey;
262	}
263
264	/* ib.c */
265	extern struct rds_transport rds_iw_transport;
266	extern void rds_iw_add_one(struct ib_device *device);
267	extern void rds_iw_remove_one(struct ib_device *device);
268	extern struct ib_client rds_iw_client;
269
270	extern unsigned int fastreg_pool_size;
271	extern unsigned int fastreg_message_size;
272
273	extern spinlock_t iw_nodev_conns_lock;
274	extern struct list_head iw_nodev_conns;
275
276	/* ib_cm.c */
277	int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp);
278	void rds_iw_conn_free(void *arg);
279	int rds_iw_conn_connect(struct rds_connection *conn);
280	void rds_iw_conn_shutdown(struct rds_connection *conn);
281	void rds_iw_state_change(struct sock *sk);
282	int __init rds_iw_listen_init(void);
283	void rds_iw_listen_stop(void);
284	void __rds_iw_conn_error(struct rds_connection conn, const char , ...);
285	int rds_iw_cm_handle_connect(struct rdma_cm_id *cm_id,
286	struct rdma_cm_event *event);
287	int rds_iw_cm_initiate_connect(struct rdma_cm_id *cm_id);
288	void rds_iw_cm_connect_complete(struct rds_connection *conn,
289	struct rdma_cm_event *event);
290
291
292	#define rds_iw_conn_error(conn, fmt...) \
293	__rds_iw_conn_error(conn, KERN_WARNING "RDS/IW: " fmt)
294
295	/* ib_rdma.c */
296	int rds_iw_update_cm_id(struct rds_iw_device rds_iwdev, struct rdma_cm_id cm_id);
297	int rds_iw_add_conn(struct rds_iw_device rds_iwdev, struct rds_connection conn);
298	void rds_iw_remove_nodev_conns(void);
299	void rds_iw_remove_conns(struct rds_iw_device *rds_iwdev);
300	struct rds_iw_mr_pool rds_iw_create_mr_pool(struct rds_iw_device );
301	void rds_iw_get_mr_info(struct rds_iw_device rds_iwdev, struct rds_info_rdma_connection iinfo);
302	void rds_iw_destroy_mr_pool(struct rds_iw_mr_pool *);
303	void rds_iw_get_mr(struct scatterlist sg, unsigned long nents,
304	struct rds_sock rs, u32 key_ret);
305	void rds_iw_sync_mr(void *trans_private, int dir);
306	void rds_iw_free_mr(void *trans_private, int invalidate);
307	void rds_iw_flush_mrs(void);
308	void rds_iw_remove_cm_id(struct rds_iw_device rds_iwdev, struct rdma_cm_id cm_id);
309
310	/* ib_recv.c */
311	int __init rds_iw_recv_init(void);
312	void rds_iw_recv_exit(void);
313	int rds_iw_recv(struct rds_connection *conn);
314	int rds_iw_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
315	gfp_t page_gfp, int prefill);
316	void rds_iw_inc_purge(struct rds_incoming *inc);
317	void rds_iw_inc_free(struct rds_incoming *inc);
318	int rds_iw_inc_copy_to_user(struct rds_incoming inc, struct iovec iov,
319	size_t size);
320	void rds_iw_recv_cq_comp_handler(struct ib_cq cq, void context);
321	void rds_iw_recv_init_ring(struct rds_iw_connection *ic);
322	void rds_iw_recv_clear_ring(struct rds_iw_connection *ic);
323	void rds_iw_recv_init_ack(struct rds_iw_connection *ic);
324	void rds_iw_attempt_ack(struct rds_iw_connection *ic);
325	void rds_iw_ack_send_complete(struct rds_iw_connection *ic);
326	u64 rds_iw_piggyb_ack(struct rds_iw_connection *ic);
327
328	/* ib_ring.c */
329	void rds_iw_ring_init(struct rds_iw_work_ring *ring, u32 nr);
330	void rds_iw_ring_resize(struct rds_iw_work_ring *ring, u32 nr);
331	u32 rds_iw_ring_alloc(struct rds_iw_work_ring ring, u32 val, u32 pos);
332	void rds_iw_ring_free(struct rds_iw_work_ring *ring, u32 val);
333	void rds_iw_ring_unalloc(struct rds_iw_work_ring *ring, u32 val);
334	int rds_iw_ring_empty(struct rds_iw_work_ring *ring);
335	int rds_iw_ring_low(struct rds_iw_work_ring *ring);
336	u32 rds_iw_ring_oldest(struct rds_iw_work_ring *ring);
337	u32 rds_iw_ring_completed(struct rds_iw_work_ring *ring, u32 wr_id, u32 oldest);
338	extern wait_queue_head_t rds_iw_ring_empty_wait;
339
340	/* ib_send.c */
341	void rds_iw_xmit_complete(struct rds_connection *conn);
342	int rds_iw_xmit(struct rds_connection conn, struct rds_message rm,
343	unsigned int hdr_off, unsigned int sg, unsigned int off);
344	void rds_iw_send_cq_comp_handler(struct ib_cq cq, void context);
345	void rds_iw_send_init_ring(struct rds_iw_connection *ic);
346	void rds_iw_send_clear_ring(struct rds_iw_connection *ic);
347	int rds_iw_xmit_rdma(struct rds_connection conn, struct rds_rdma_op op);
348	void rds_iw_send_add_credits(struct rds_connection *conn, unsigned int credits);
349	void rds_iw_advertise_credits(struct rds_connection *conn, unsigned int posted);
350	int rds_iw_send_grab_credits(struct rds_iw_connection *ic, u32 wanted,
351	u32 *adv_credits, int need_posted);
352
353	/* ib_stats.c */
354	DECLARE_PER_CPU(struct rds_iw_statistics, rds_iw_stats);
355	#define rds_iw_stats_inc(member) rds_stats_inc_which(rds_iw_stats, member)
356	unsigned int rds_iw_stats_info_copy(struct rds_info_iterator *iter,
357	unsigned int avail);
358
359	/* ib_sysctl.c */
360	int __init rds_iw_sysctl_init(void);
361	void rds_iw_sysctl_exit(void);
362	extern unsigned long rds_iw_sysctl_max_send_wr;
363	extern unsigned long rds_iw_sysctl_max_recv_wr;
364	extern unsigned long rds_iw_sysctl_max_unsig_wrs;
365	extern unsigned long rds_iw_sysctl_max_unsig_bytes;
366	extern unsigned long rds_iw_sysctl_max_recv_allocation;
367	extern unsigned int rds_iw_sysctl_flow_control;
368	extern ctl_table rds_iw_sysctl_table[];
369
370	/*
371	* Helper functions for getting/setting the header and data SGEs in
372	* RDS packets (not RDMA)
373	*/
374	static inline struct ib_sge *
375	rds_iw_header_sge(struct rds_iw_connection ic, struct ib_sge sge)
376	{
377	return &sge[0];
378	}
379
380	static inline struct ib_sge *
381	rds_iw_data_sge(struct rds_iw_connection ic, struct ib_sge sge)
382	{
383	return &sge[1];
384	}
385
386	static inline void rds_iw_set_64bit(u64 *ptr, u64 val)
387	{
388	#if BITS_PER_LONG == 64
389	*ptr = val;
390	#else
391	set_64bit(ptr, val);
392	#endif
393	}
394
395	#endif