[deliverable/linux.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_DEFAULT_RETRY_COUNT	2

#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;
#ifdef KERNEL_HAS_ATOMIC64
	atomic64_t		i_ack_next;	/* next ACK to send */
#else
	spinlock_t		i_ack_lock;	/* protect i_ack_next */
	u64			i_ack_next;	/* next ACK to send */
#endif
	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;
	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 unsigned int rds_ib_retry_count;

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);
void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
void __rds_ib_destroy_conns(struct list_head *list, spinlock_t *list_lock);
static inline void rds_ib_destroy_nodev_conns(void)
{
	__rds_ib_destroy_conns(&ib_nodev_conns, &ib_nodev_conns_lock);
}
static inline void rds_ib_destroy_conns(struct rds_ib_device *rds_ibdev)
{
	__rds_ib_destroy_conns(&rds_ibdev->conn_list, &rds_ibdev->spinlock);
}
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, int max_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)
 *
 * From version 3.1 onwards, header is in front of data in the sge.
 */
static inline struct ib_sge *
rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
{
	if (ic->conn->c_version > RDS_PROTOCOL_3_0)
		return &sge[0];
	else
		return &sge[1];
}

static inline struct ib_sge *
rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
{
	if (ic->conn->c_version > RDS_PROTOCOL_3_0)
		return &sge[1];
	else
		return &sge[0];
}

#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
3ba23ade AG	18	#define RDS_IB_DEFAULT_RETRY_COUNT 2
3ba23ade AG	19
ec16227e AG	20	#define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
	21
	22	extern struct list_head rds_ib_devices;
	23
	24	/*
	25	* IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
	26	* try and minimize the amount of memory tied up both the device and
	27	* socket receive queues.
	28	*/
	29	/* page offset of the final full frag that fits in the page */
	30	#define RDS_PAGE_LAST_OFF (((PAGE_SIZE / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE)
	31	struct rds_page_frag {
	32	struct list_head f_item;
	33	struct page *f_page;
	34	unsigned long f_offset;
	35	dma_addr_t f_mapped;
	36	};
	37
	38	struct rds_ib_incoming {
	39	struct list_head ii_frags;
	40	struct rds_incoming ii_inc;
	41	};
	42
	43	struct rds_ib_connect_private {
	44	/* Add new fields at the end, and don't permute existing fields. */
	45	__be32 dp_saddr;
	46	__be32 dp_daddr;
	47	u8 dp_protocol_major;
	48	u8 dp_protocol_minor;
	49	__be16 dp_protocol_minor_mask; /* bitmask */
	50	__be32 dp_reserved1;
	51	__be64 dp_ack_seq;
	52	__be32 dp_credit; /* non-zero enables flow ctl */
	53	};
	54
	55	struct rds_ib_send_work {
	56	struct rds_message *s_rm;
	57	struct rds_rdma_op *s_op;
	58	struct ib_send_wr s_wr;
	59	struct ib_sge s_sge[RDS_IB_MAX_SGE];
	60	unsigned long s_queued;
	61	};
	62
	63	struct rds_ib_recv_work {
	64	struct rds_ib_incoming *r_ibinc;
	65	struct rds_page_frag *r_frag;
	66	struct ib_recv_wr r_wr;
	67	struct ib_sge r_sge[2];
	68	};
	69
	70	struct rds_ib_work_ring {
	71	u32 w_nr;
	72	u32 w_alloc_ptr;
	73	u32 w_alloc_ctr;
	74	u32 w_free_ptr;
	75	atomic_t w_free_ctr;
	76	};
	77
	78	struct rds_ib_device;
	79
	80	struct rds_ib_connection {
	81
	82	struct list_head ib_node;
	83	struct rds_ib_device *rds_ibdev;
84	struct rds_connection *conn;
85
86	/* alphabet soup, IBTA style */
87	struct rdma_cm_id *i_cm_id;
88	struct ib_pd *i_pd;
89	struct ib_mr *i_mr;
90	struct ib_cq *i_send_cq;
91	struct ib_cq *i_recv_cq;
92
93	/* tx */
94	struct rds_ib_work_ring i_send_ring;
95	struct rds_message *i_rm;
96	struct rds_header *i_send_hdrs;
97	u64 i_send_hdrs_dma;
98	struct rds_ib_send_work *i_sends;
99
100	/* rx */
101	struct mutex i_recv_mutex;
102	struct rds_ib_work_ring i_recv_ring;
103	struct rds_ib_incoming *i_ibinc;
104	u32 i_recv_data_rem;
105	struct rds_header *i_recv_hdrs;
106	u64 i_recv_hdrs_dma;
107	struct rds_ib_recv_work *i_recvs;
108	struct rds_page_frag i_frag;
109	u64 i_ack_recv; /* last ACK received */
110
111	/* sending acks */
112	unsigned long i_ack_flags;
8cbd9606 AG	113	#ifdef KERNEL_HAS_ATOMIC64
	114	atomic64_t i_ack_next; /* next ACK to send */
	115	#else
	116	spinlock_t i_ack_lock; /* protect i_ack_next */
ec16227e	117	u64 i_ack_next; /* next ACK to send */
8cbd9606	118	#endif
ec16227e AG	119	struct rds_header *i_ack;
	120	struct ib_send_wr i_ack_wr;
	121	struct ib_sge i_ack_sge;
	122	u64 i_ack_dma;
	123	unsigned long i_ack_queued;
	124
	125	/* Flow control related information
	126	*
	127	* Our algorithm uses a pair variables that we need to access
	128	* atomically - one for the send credits, and one posted
	129	* recv credits we need to transfer to remote.
	130	* Rather than protect them using a slow spinlock, we put both into
	131	* a single atomic_t and update it using cmpxchg
	132	*/
	133	atomic_t i_credits;
	134
	135	/* Protocol version specific information */
	136	unsigned int i_flowctl:1; /* enable/disable flow ctl */
	137
	138	/* Batched completions */
	139	unsigned int i_unsignaled_wrs;
	140	long i_unsignaled_bytes;
	141	};
	142
	143	/* This assumes that atomic_t is at least 32 bits */
	144	#define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
	145	#define IB_GET_POST_CREDITS(v) ((v) >> 16)
	146	#define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
	147	#define IB_SET_POST_CREDITS(v) ((v) << 16)
	148
	149	struct rds_ib_ipaddr {
	150	struct list_head list;
	151	__be32 ipaddr;
	152	};
	153
	154	struct rds_ib_device {
	155	struct list_head list;
	156	struct list_head ipaddr_list;
	157	struct list_head conn_list;
	158	struct ib_device *dev;
	159	struct ib_pd *pd;
	160	struct ib_mr *mr;
	161	struct rds_ib_mr_pool *mr_pool;
ec16227e AG	162	unsigned int fmr_max_remaps;
	163	unsigned int max_fmrs;
	164	int max_sge;
	165	unsigned int max_wrs;
	166	spinlock_t spinlock; /* protect the above */
	167	};
	168
	169	/* bits for i_ack_flags */
	170	#define IB_ACK_IN_FLIGHT 0
	171	#define IB_ACK_REQUESTED 1
	172
	173	/* Magic WR_ID for ACKs */
	174	#define RDS_IB_ACK_WR_ID (~(u64) 0)
	175
	176	struct rds_ib_statistics {
	177	uint64_t s_ib_connect_raced;
	178	uint64_t s_ib_listen_closed_stale;
	179	uint64_t s_ib_tx_cq_call;
	180	uint64_t s_ib_tx_cq_event;
	181	uint64_t s_ib_tx_ring_full;
	182	uint64_t s_ib_tx_throttle;
	183	uint64_t s_ib_tx_sg_mapping_failure;
	184	uint64_t s_ib_tx_stalled;
	185	uint64_t s_ib_tx_credit_updates;
	186	uint64_t s_ib_rx_cq_call;
	187	uint64_t s_ib_rx_cq_event;
	188	uint64_t s_ib_rx_ring_empty;
	189	uint64_t s_ib_rx_refill_from_cq;
	190	uint64_t s_ib_rx_refill_from_thread;
	191	uint64_t s_ib_rx_alloc_limit;
	192	uint64_t s_ib_rx_credit_updates;
	193	uint64_t s_ib_ack_sent;
	194	uint64_t s_ib_ack_send_failure;
	195	uint64_t s_ib_ack_send_delayed;
	196	uint64_t s_ib_ack_send_piggybacked;
	197	uint64_t s_ib_ack_received;
	198	uint64_t s_ib_rdma_mr_alloc;
	199	uint64_t s_ib_rdma_mr_free;
	200	uint64_t s_ib_rdma_mr_used;
	201	uint64_t s_ib_rdma_mr_pool_flush;
	202	uint64_t s_ib_rdma_mr_pool_wait;
	203	uint64_t s_ib_rdma_mr_pool_depleted;
	204	};
	205
	206	extern struct workqueue_struct *rds_ib_wq;
	207
	208	/*
	209	* Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
	210	* doesn't define it.
	211	*/
	212	static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
	213	struct scatterlist *sg, unsigned int sg_dma_len, int direction)
	214	{
	215	unsigned int i;
	216
	217	for (i = 0; i < sg_dma_len; ++i) {
	218	ib_dma_sync_single_for_cpu(dev,
	219	ib_sg_dma_address(dev, &sg[i]),
	220	ib_sg_dma_len(dev, &sg[i]),
	221	direction);
	222	}
	223	}
	224	#define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu
	225
226	static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
227	struct scatterlist *sg, unsigned int sg_dma_len, int direction)
228	{
229	unsigned int i;
230
231	for (i = 0; i < sg_dma_len; ++i) {
232	ib_dma_sync_single_for_device(dev,
233	ib_sg_dma_address(dev, &sg[i]),
234	ib_sg_dma_len(dev, &sg[i]),
235	direction);
236	}
237	}
238	#define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device
239
240
241	/* ib.c */
242	extern struct rds_transport rds_ib_transport;
243	extern void rds_ib_add_one(struct ib_device *device);
244	extern void rds_ib_remove_one(struct ib_device *device);
245	extern struct ib_client rds_ib_client;
246
247	extern unsigned int fmr_pool_size;
248	extern unsigned int fmr_message_size;
3ba23ade	249	extern unsigned int rds_ib_retry_count;
ec16227e AG	250
	251	extern spinlock_t ib_nodev_conns_lock;
	252	extern struct list_head ib_nodev_conns;
	253
	254	/* ib_cm.c */
	255	int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
	256	void rds_ib_conn_free(void *arg);
	257	int rds_ib_conn_connect(struct rds_connection *conn);
	258	void rds_ib_conn_shutdown(struct rds_connection *conn);
	259	void rds_ib_state_change(struct sock *sk);
	260	int __init rds_ib_listen_init(void);
	261	void rds_ib_listen_stop(void);
	262	void __rds_ib_conn_error(struct rds_connection conn, const char , ...);
	263	int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
	264	struct rdma_cm_event *event);
	265	int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
	266	void rds_ib_cm_connect_complete(struct rds_connection *conn,
	267	struct rdma_cm_event *event);
	268
	269
	270	#define rds_ib_conn_error(conn, fmt...) \
	271	__rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
	272
	273	/* ib_rdma.c */
	274	int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
745cbcca AG	275	void rds_ib_add_conn(struct rds_ib_device rds_ibdev, struct rds_connection conn);
	276	void rds_ib_remove_conn(struct rds_ib_device rds_ibdev, struct rds_connection conn);
	277	void __rds_ib_destroy_conns(struct list_head list, spinlock_t list_lock);
	278	static inline void rds_ib_destroy_nodev_conns(void)
	279	{
	280	__rds_ib_destroy_conns(&ib_nodev_conns, &ib_nodev_conns_lock);
	281	}
	282	static inline void rds_ib_destroy_conns(struct rds_ib_device *rds_ibdev)
	283	{
	284	__rds_ib_destroy_conns(&rds_ibdev->conn_list, &rds_ibdev->spinlock);
	285	}
ec16227e AG	286	struct rds_ib_mr_pool rds_ib_create_mr_pool(struct rds_ib_device );
	287	void rds_ib_get_mr_info(struct rds_ib_device rds_ibdev, struct rds_info_rdma_connection iinfo);
	288	void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
	289	void rds_ib_get_mr(struct scatterlist sg, unsigned long nents,
	290	struct rds_sock rs, u32 key_ret);
	291	void rds_ib_sync_mr(void *trans_private, int dir);
	292	void rds_ib_free_mr(void *trans_private, int invalidate);
	293	void rds_ib_flush_mrs(void);
	294
	295	/* ib_recv.c */
	296	int __init rds_ib_recv_init(void);
	297	void rds_ib_recv_exit(void);
	298	int rds_ib_recv(struct rds_connection *conn);
	299	int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
	300	gfp_t page_gfp, int prefill);
	301	void rds_ib_inc_purge(struct rds_incoming *inc);
	302	void rds_ib_inc_free(struct rds_incoming *inc);
	303	int rds_ib_inc_copy_to_user(struct rds_incoming inc, struct iovec iov,
	304	size_t size);
	305	void rds_ib_recv_cq_comp_handler(struct ib_cq cq, void context);
	306	void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
	307	void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
	308	void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
	309	void rds_ib_attempt_ack(struct rds_ib_connection *ic);
	310	void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
	311	u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
	312
	313	/* ib_ring.c */
	314	void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
	315	void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
	316	u32 rds_ib_ring_alloc(struct rds_ib_work_ring ring, u32 val, u32 pos);
	317	void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
	318	void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
	319	int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
	320	int rds_ib_ring_low(struct rds_ib_work_ring *ring);
	321	u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
	322	u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
	323	extern wait_queue_head_t rds_ib_ring_empty_wait;
	324
	325	/* ib_send.c */
	326	void rds_ib_xmit_complete(struct rds_connection *conn);
	327	int rds_ib_xmit(struct rds_connection conn, struct rds_message rm,
	328	unsigned int hdr_off, unsigned int sg, unsigned int off);
	329	void rds_ib_send_cq_comp_handler(struct ib_cq cq, void context);
	330	void rds_ib_send_init_ring(struct rds_ib_connection *ic);
	331	void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
	332	int rds_ib_xmit_rdma(struct rds_connection conn, struct rds_rdma_op op);
	333	void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
	334	void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
	335	int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
7b70d033	336	u32 *adv_credits, int need_posted, int max_posted);
ec16227e AG	337
	338	/* ib_stats.c */
	339	DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
	340	#define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
	341	unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
	342	unsigned int avail);
	343
	344	/* ib_sysctl.c */
	345	int __init rds_ib_sysctl_init(void);
	346	void rds_ib_sysctl_exit(void);
	347	extern unsigned long rds_ib_sysctl_max_send_wr;
	348	extern unsigned long rds_ib_sysctl_max_recv_wr;
	349	extern unsigned long rds_ib_sysctl_max_unsig_wrs;
	350	extern unsigned long rds_ib_sysctl_max_unsig_bytes;
	351	extern unsigned long rds_ib_sysctl_max_recv_allocation;
	352	extern unsigned int rds_ib_sysctl_flow_control;
	353	extern ctl_table rds_ib_sysctl_table[];
	354
	355	/*
	356	* Helper functions for getting/setting the header and data SGEs in
	357	* RDS packets (not RDMA)
02a6a259 AG	358	*
02a6a259 AG	359	* From version 3.1 onwards, header is in front of data in the sge.
ec16227e AG	360	*/
	361	static inline struct ib_sge *
	362	rds_ib_header_sge(struct rds_ib_connection ic, struct ib_sge sge)
	363	{
02a6a259 AG	364	if (ic->conn->c_version > RDS_PROTOCOL_3_0)
	365	return &sge[0];
	366	else
	367	return &sge[1];
ec16227e AG	368	}
	369
	370	static inline struct ib_sge *
	371	rds_ib_data_sge(struct rds_ib_connection ic, struct ib_sge sge)
	372	{
02a6a259 AG	373	if (ic->conn->c_version > RDS_PROTOCOL_3_0)
	374	return &sge[1];
	375	else
	376	return &sge[0];
ec16227e AG	377	}
ec16227e AG	378
ec16227e	379	#endif