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

#ifndef _RDS_IB_H
#define _RDS_IB_H

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

#define RDS_FMR_SIZE			256
#define RDS_FMR_POOL_SIZE		4096

#define RDS_IB_MAX_SGE			8
#define RDS_IB_RECV_SGE 		2

#define RDS_IB_DEFAULT_RECV_WR		1024
#define RDS_IB_DEFAULT_SEND_WR		256

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

extern struct list_head rds_ib_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_ib_incoming {
	struct list_head	ii_frags;
	struct rds_incoming	ii_inc;
};

struct rds_ib_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_ib_send_work {
	struct rds_message	*s_rm;
	struct rds_rdma_op	*s_op;
	struct ib_send_wr	s_wr;
	struct ib_sge		s_sge[RDS_IB_MAX_SGE];
	unsigned long		s_queued;
};

struct rds_ib_recv_work {
	struct rds_ib_incoming 	*r_ibinc;
	struct rds_page_frag	*r_frag;
	struct ib_recv_wr	r_wr;
	struct ib_sge		r_sge[2];
};

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

struct rds_ib_device;

struct rds_ib_connection {

	struct list_head	ib_node;
	struct rds_ib_device	*rds_ibdev;
	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_ib_work_ring	i_send_ring;
	struct rds_message	*i_rm;
	struct rds_header	*i_send_hdrs;
	u64			i_send_hdrs_dma;
	struct rds_ib_send_work *i_sends;

	/* rx */
	struct mutex		i_recv_mutex;
	struct rds_ib_work_ring	i_recv_ring;
	struct rds_ib_incoming	*i_ibinc;
	u32			i_recv_data_rem;
	struct rds_header	*i_recv_hdrs;
	u64			i_recv_hdrs_dma;
	struct rds_ib_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 */

	/* 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_ib_ipaddr {
	struct list_head	list;
	__be32			ipaddr;
};

struct rds_ib_device {
	struct list_head	list;
	struct list_head	ipaddr_list;
	struct list_head	conn_list;
	struct ib_device	*dev;
	struct ib_pd		*pd;
	struct ib_mr		*mr;
	struct rds_ib_mr_pool	*mr_pool;
	int			fmr_page_shift;
	int			fmr_page_size;
	u64			fmr_page_mask;
	unsigned int		fmr_max_remaps;
	unsigned int		max_fmrs;
	int			max_sge;
	unsigned int		max_wrs;
	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_IB_ACK_WR_ID	(~(u64) 0)

struct rds_ib_statistics {
	uint64_t	s_ib_connect_raced;
	uint64_t	s_ib_listen_closed_stale;
	uint64_t	s_ib_tx_cq_call;
	uint64_t	s_ib_tx_cq_event;
	uint64_t	s_ib_tx_ring_full;
	uint64_t	s_ib_tx_throttle;
	uint64_t	s_ib_tx_sg_mapping_failure;
	uint64_t	s_ib_tx_stalled;
	uint64_t	s_ib_tx_credit_updates;
	uint64_t	s_ib_rx_cq_call;
	uint64_t	s_ib_rx_cq_event;
	uint64_t	s_ib_rx_ring_empty;
	uint64_t	s_ib_rx_refill_from_cq;
	uint64_t	s_ib_rx_refill_from_thread;
	uint64_t	s_ib_rx_alloc_limit;
	uint64_t	s_ib_rx_credit_updates;
	uint64_t	s_ib_ack_sent;
	uint64_t	s_ib_ack_send_failure;
	uint64_t	s_ib_ack_send_delayed;
	uint64_t	s_ib_ack_send_piggybacked;
	uint64_t	s_ib_ack_received;
	uint64_t	s_ib_rdma_mr_alloc;
	uint64_t	s_ib_rdma_mr_free;
	uint64_t	s_ib_rdma_mr_used;
	uint64_t	s_ib_rdma_mr_pool_flush;
	uint64_t	s_ib_rdma_mr_pool_wait;
	uint64_t	s_ib_rdma_mr_pool_depleted;
};

extern struct workqueue_struct *rds_ib_wq;

/*
 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
 * doesn't define it.
 */
static inline void rds_ib_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_ib_dma_sync_sg_for_cpu

static inline void rds_ib_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_ib_dma_sync_sg_for_device


/* ib.c */
extern struct rds_transport rds_ib_transport;
extern void rds_ib_add_one(struct ib_device *device);
extern void rds_ib_remove_one(struct ib_device *device);
extern struct ib_client rds_ib_client;

extern unsigned int fmr_pool_size;
extern unsigned int fmr_message_size;

extern spinlock_t ib_nodev_conns_lock;
extern struct list_head ib_nodev_conns;

/* ib_cm.c */
int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
void rds_ib_conn_free(void *arg);
int rds_ib_conn_connect(struct rds_connection *conn);
void rds_ib_conn_shutdown(struct rds_connection *conn);
void rds_ib_state_change(struct sock *sk);
int __init rds_ib_listen_init(void);
void rds_ib_listen_stop(void);
void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
			     struct rdma_cm_event *event);
int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
void rds_ib_cm_connect_complete(struct rds_connection *conn,
				struct rdma_cm_event *event);


#define rds_ib_conn_error(conn, fmt...) \
	__rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)

/* ib_rdma.c */
int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
int rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
void rds_ib_remove_nodev_conns(void);
void rds_ib_remove_conns(struct rds_ib_device *rds_ibdev);
struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *);
void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo);
void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
		    struct rds_sock *rs, u32 *key_ret);
void rds_ib_sync_mr(void *trans_private, int dir);
void rds_ib_free_mr(void *trans_private, int invalidate);
void rds_ib_flush_mrs(void);

/* ib_recv.c */
int __init rds_ib_recv_init(void);
void rds_ib_recv_exit(void);
int rds_ib_recv(struct rds_connection *conn);
int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
		       gfp_t page_gfp, int prefill);
void rds_ib_inc_purge(struct rds_incoming *inc);
void rds_ib_inc_free(struct rds_incoming *inc);
int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
			     size_t size);
void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
void rds_ib_attempt_ack(struct rds_ib_connection *ic);
void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);

/* ib_ring.c */
void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
int rds_ib_ring_low(struct rds_ib_work_ring *ring);
u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
extern wait_queue_head_t rds_ib_ring_empty_wait;

/* ib_send.c */
void rds_ib_xmit_complete(struct rds_connection *conn);
int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
		unsigned int hdr_off, unsigned int sg, unsigned int off);
void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context);
void rds_ib_send_init_ring(struct rds_ib_connection *ic);
void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
int rds_ib_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op);
void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
			     u32 *adv_credits, int need_posted);

/* ib_stats.c */
DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
#define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
				    unsigned int avail);

/* ib_sysctl.c */
int __init rds_ib_sysctl_init(void);
void rds_ib_sysctl_exit(void);
extern unsigned long rds_ib_sysctl_max_send_wr;
extern unsigned long rds_ib_sysctl_max_recv_wr;
extern unsigned long rds_ib_sysctl_max_unsig_wrs;
extern unsigned long rds_ib_sysctl_max_unsig_bytes;
extern unsigned long rds_ib_sysctl_max_recv_allocation;
extern unsigned int rds_ib_sysctl_flow_control;
extern ctl_table rds_ib_sysctl_table[];

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

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

static inline void rds_ib_set_64bit(u64 *ptr, u64 val)
{
#if BITS_PER_LONG == 64
	*ptr = val;
#else
	set_64bit(ptr, val);
#endif
}

#endif
Commit	Line	Data
ec16227e AG	1	#ifndef _RDS_IB_H
	2	#define _RDS_IB_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_FMR_SIZE 256
	10	#define RDS_FMR_POOL_SIZE 4096
	11
	12	#define RDS_IB_MAX_SGE 8
	13	#define RDS_IB_RECV_SGE 2
	14
	15	#define RDS_IB_DEFAULT_RECV_WR 1024
	16	#define RDS_IB_DEFAULT_SEND_WR 256
	17
	18	#define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
	19
	20	extern struct list_head rds_ib_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_ib_incoming {
	37	struct list_head ii_frags;
	38	struct rds_incoming ii_inc;
	39	};
	40
	41	struct rds_ib_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_ib_send_work {
	54	struct rds_message *s_rm;
	55	struct rds_rdma_op *s_op;
	56	struct ib_send_wr s_wr;
	57	struct ib_sge s_sge[RDS_IB_MAX_SGE];
	58	unsigned long s_queued;
	59	};
	60
	61	struct rds_ib_recv_work {
	62	struct rds_ib_incoming *r_ibinc;
	63	struct rds_page_frag *r_frag;
	64	struct ib_recv_wr r_wr;
65	struct ib_sge r_sge[2];
66	};
67
68	struct rds_ib_work_ring {
69	u32 w_nr;
70	u32 w_alloc_ptr;
71	u32 w_alloc_ctr;
72	u32 w_free_ptr;
73	atomic_t w_free_ctr;
74	};
75
76	struct rds_ib_device;
77
78	struct rds_ib_connection {
79
80	struct list_head ib_node;
81	struct rds_ib_device *rds_ibdev;
82	struct rds_connection *conn;
83
84	/* alphabet soup, IBTA style */
85	struct rdma_cm_id *i_cm_id;
86	struct ib_pd *i_pd;
87	struct ib_mr *i_mr;
88	struct ib_cq *i_send_cq;
89	struct ib_cq *i_recv_cq;
90
91	/* tx */
92	struct rds_ib_work_ring i_send_ring;
93	struct rds_message *i_rm;
94	struct rds_header *i_send_hdrs;
95	u64 i_send_hdrs_dma;
96	struct rds_ib_send_work *i_sends;
97
98	/* rx */
99	struct mutex i_recv_mutex;
100	struct rds_ib_work_ring i_recv_ring;
101	struct rds_ib_incoming *i_ibinc;
102	u32 i_recv_data_rem;
103	struct rds_header *i_recv_hdrs;
104	u64 i_recv_hdrs_dma;
105	struct rds_ib_recv_work *i_recvs;
106	struct rds_page_frag i_frag;
107	u64 i_ack_recv; /* last ACK received */
108
109	/* sending acks */
110	unsigned long i_ack_flags;
111	u64 i_ack_next; /* next ACK to send */
112	struct rds_header *i_ack;
113	struct ib_send_wr i_ack_wr;
114	struct ib_sge i_ack_sge;
115	u64 i_ack_dma;
116	unsigned long i_ack_queued;
117
118	/* Flow control related information
119	*
120	* Our algorithm uses a pair variables that we need to access
121	* atomically - one for the send credits, and one posted
122	* recv credits we need to transfer to remote.
123	* Rather than protect them using a slow spinlock, we put both into
124	* a single atomic_t and update it using cmpxchg
125	*/
126	atomic_t i_credits;
127
128	/* Protocol version specific information */
129	unsigned int i_flowctl:1; /* enable/disable flow ctl */
130
131	/* Batched completions */
132	unsigned int i_unsignaled_wrs;
133	long i_unsignaled_bytes;
134	};
135
136	/* This assumes that atomic_t is at least 32 bits */
137	#define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
138	#define IB_GET_POST_CREDITS(v) ((v) >> 16)
139	#define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
140	#define IB_SET_POST_CREDITS(v) ((v) << 16)
141
142	struct rds_ib_ipaddr {
143	struct list_head list;
144	__be32 ipaddr;
145	};
146
147	struct rds_ib_device {
148	struct list_head list;
149	struct list_head ipaddr_list;
150	struct list_head conn_list;
151	struct ib_device *dev;
152	struct ib_pd *pd;
153	struct ib_mr *mr;
154	struct rds_ib_mr_pool *mr_pool;
155	int fmr_page_shift;
156	int fmr_page_size;
157	u64 fmr_page_mask;
158	unsigned int fmr_max_remaps;
159	unsigned int max_fmrs;
160	int max_sge;
161	unsigned int max_wrs;
162	spinlock_t spinlock; /* protect the above */
163	};
164
165	/* bits for i_ack_flags */
166	#define IB_ACK_IN_FLIGHT 0
167	#define IB_ACK_REQUESTED 1
168
169	/* Magic WR_ID for ACKs */
170	#define RDS_IB_ACK_WR_ID (~(u64) 0)
171
172	struct rds_ib_statistics {
173	uint64_t s_ib_connect_raced;
174	uint64_t s_ib_listen_closed_stale;
175	uint64_t s_ib_tx_cq_call;
176	uint64_t s_ib_tx_cq_event;
177	uint64_t s_ib_tx_ring_full;
178	uint64_t s_ib_tx_throttle;
179	uint64_t s_ib_tx_sg_mapping_failure;
180	uint64_t s_ib_tx_stalled;
181	uint64_t s_ib_tx_credit_updates;
182	uint64_t s_ib_rx_cq_call;
183	uint64_t s_ib_rx_cq_event;
184	uint64_t s_ib_rx_ring_empty;
185	uint64_t s_ib_rx_refill_from_cq;
186	uint64_t s_ib_rx_refill_from_thread;
187	uint64_t s_ib_rx_alloc_limit;
188	uint64_t s_ib_rx_credit_updates;
189	uint64_t s_ib_ack_sent;
190	uint64_t s_ib_ack_send_failure;
191	uint64_t s_ib_ack_send_delayed;
192	uint64_t s_ib_ack_send_piggybacked;
193	uint64_t s_ib_ack_received;
194	uint64_t s_ib_rdma_mr_alloc;
195	uint64_t s_ib_rdma_mr_free;
196	uint64_t s_ib_rdma_mr_used;
197	uint64_t s_ib_rdma_mr_pool_flush;
198	uint64_t s_ib_rdma_mr_pool_wait;
199	uint64_t s_ib_rdma_mr_pool_depleted;
200	};
201
202	extern struct workqueue_struct *rds_ib_wq;
203
204	/*
205	* Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
206	* doesn't define it.
207	*/
208	static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
209	struct scatterlist *sg, unsigned int sg_dma_len, int direction)
210	{
211	unsigned int i;
212
213	for (i = 0; i < sg_dma_len; ++i) {
214	ib_dma_sync_single_for_cpu(dev,
215	ib_sg_dma_address(dev, &sg[i]),
216	ib_sg_dma_len(dev, &sg[i]),
217	direction);
218	}
219	}
220	#define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu
221
222	static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
223	struct scatterlist *sg, unsigned int sg_dma_len, int direction)
224	{
225	unsigned int i;
226
227	for (i = 0; i < sg_dma_len; ++i) {
228	ib_dma_sync_single_for_device(dev,
229	ib_sg_dma_address(dev, &sg[i]),
230	ib_sg_dma_len(dev, &sg[i]),
231	direction);
232	}
233	}
234	#define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device
235
236
237	/* ib.c */
238	extern struct rds_transport rds_ib_transport;
239	extern void rds_ib_add_one(struct ib_device *device);
240	extern void rds_ib_remove_one(struct ib_device *device);
241	extern struct ib_client rds_ib_client;
242
243	extern unsigned int fmr_pool_size;
244	extern unsigned int fmr_message_size;
245
246	extern spinlock_t ib_nodev_conns_lock;
247	extern struct list_head ib_nodev_conns;
248
249	/* ib_cm.c */
250	int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
251	void rds_ib_conn_free(void *arg);
252	int rds_ib_conn_connect(struct rds_connection *conn);
253	void rds_ib_conn_shutdown(struct rds_connection *conn);
254	void rds_ib_state_change(struct sock *sk);
255	int __init rds_ib_listen_init(void);
256	void rds_ib_listen_stop(void);
257	void __rds_ib_conn_error(struct rds_connection conn, const char , ...);
258	int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
259	struct rdma_cm_event *event);
260	int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
261	void rds_ib_cm_connect_complete(struct rds_connection *conn,
262	struct rdma_cm_event *event);
263
264
265	#define rds_ib_conn_error(conn, fmt...) \
266	__rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
267
268	/* ib_rdma.c */
269	int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
270	int rds_ib_add_conn(struct rds_ib_device rds_ibdev, struct rds_connection conn);
271	void rds_ib_remove_nodev_conns(void);
272	void rds_ib_remove_conns(struct rds_ib_device *rds_ibdev);
273	struct rds_ib_mr_pool rds_ib_create_mr_pool(struct rds_ib_device );
274	void rds_ib_get_mr_info(struct rds_ib_device rds_ibdev, struct rds_info_rdma_connection iinfo);
275	void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
276	void rds_ib_get_mr(struct scatterlist sg, unsigned long nents,
277	struct rds_sock rs, u32 key_ret);
278	void rds_ib_sync_mr(void *trans_private, int dir);
279	void rds_ib_free_mr(void *trans_private, int invalidate);
280	void rds_ib_flush_mrs(void);
281
282	/* ib_recv.c */
283	int __init rds_ib_recv_init(void);
284	void rds_ib_recv_exit(void);
285	int rds_ib_recv(struct rds_connection *conn);
286	int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
287	gfp_t page_gfp, int prefill);
288	void rds_ib_inc_purge(struct rds_incoming *inc);
289	void rds_ib_inc_free(struct rds_incoming *inc);
290	int rds_ib_inc_copy_to_user(struct rds_incoming inc, struct iovec iov,
291	size_t size);
292	void rds_ib_recv_cq_comp_handler(struct ib_cq cq, void context);
293	void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
294	void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
295	void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
296	void rds_ib_attempt_ack(struct rds_ib_connection *ic);
297	void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
298	u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
299
300	/* ib_ring.c */
301	void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
302	void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
303	u32 rds_ib_ring_alloc(struct rds_ib_work_ring ring, u32 val, u32 pos);
304	void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
305	void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
306	int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
307	int rds_ib_ring_low(struct rds_ib_work_ring *ring);
308	u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
309	u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
310	extern wait_queue_head_t rds_ib_ring_empty_wait;
311
312	/* ib_send.c */
313	void rds_ib_xmit_complete(struct rds_connection *conn);
314	int rds_ib_xmit(struct rds_connection conn, struct rds_message rm,
315	unsigned int hdr_off, unsigned int sg, unsigned int off);
316	void rds_ib_send_cq_comp_handler(struct ib_cq cq, void context);
317	void rds_ib_send_init_ring(struct rds_ib_connection *ic);
318	void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
319	int rds_ib_xmit_rdma(struct rds_connection conn, struct rds_rdma_op op);
320	void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
321	void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
322	int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
323	u32 *adv_credits, int need_posted);
324
325	/* ib_stats.c */
326	DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
327	#define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
328	unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
329	unsigned int avail);
330
331	/* ib_sysctl.c */
332	int __init rds_ib_sysctl_init(void);
333	void rds_ib_sysctl_exit(void);
334	extern unsigned long rds_ib_sysctl_max_send_wr;
335	extern unsigned long rds_ib_sysctl_max_recv_wr;
336	extern unsigned long rds_ib_sysctl_max_unsig_wrs;
337	extern unsigned long rds_ib_sysctl_max_unsig_bytes;
338	extern unsigned long rds_ib_sysctl_max_recv_allocation;
339	extern unsigned int rds_ib_sysctl_flow_control;
340	extern ctl_table rds_ib_sysctl_table[];
341
342	/*
343	* Helper functions for getting/setting the header and data SGEs in
344	* RDS packets (not RDMA)
345	*/
346	static inline struct ib_sge *
347	rds_ib_header_sge(struct rds_ib_connection ic, struct ib_sge sge)
348	{
349	return &sge[0];
350	}
351
352	static inline struct ib_sge *
353	rds_ib_data_sge(struct rds_ib_connection ic, struct ib_sge sge)
354	{
355	return &sge[1];
356	}
357
358	static inline void rds_ib_set_64bit(u64 *ptr, u64 val)
359	{
360	#if BITS_PER_LONG == 64
361	*ptr = val;
362	#else
363	set_64bit(ptr, val);
364	#endif
365	}
366
367	#endif