[linux.git] / net / rds / iw.h

#ifndef _RDS_IW_H
#define _RDS_IW_H

#include <linux/interrupt.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 rm_rdma_op	*s_op;
	struct rds_iw_mapping	*s_mapping;
	struct ib_mr		*s_mr;
	unsigned char		s_remap_count;

	union {
		struct ib_send_wr	s_send_wr;
		struct ib_rdma_wr	s_rdma_wr;
		struct ib_reg_wr	s_reg_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 tasklet_struct	i_recv_tasklet;
	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;
#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 */
	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			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_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 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 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);
void rds_iw_add_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn);
void rds_iw_remove_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn);
void __rds_iw_destroy_conns(struct list_head *list, spinlock_t *list_lock);
static inline void rds_iw_destroy_nodev_conns(void)
{
	__rds_iw_destroy_conns(&iw_nodev_conns, &iw_nodev_conns_lock);
}
static inline void rds_iw_destroy_conns(struct rds_iw_device *rds_iwdev)
{
	__rds_iw_destroy_conns(&rds_iwdev->conn_list, &rds_iwdev->spinlock);
}
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);

/* ib_recv.c */
int 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_free(struct rds_incoming *inc);
int rds_iw_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
void rds_iw_recv_cq_comp_handler(struct ib_cq *cq, void *context);
void rds_iw_recv_tasklet_fn(unsigned long data);
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 rm_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, int max_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 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;

/*
 * 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];
}

#endif
Commit	Line	Data
fcd8b7c0 AG	1	#ifndef _RDS_IW_H
	2	#define _RDS_IW_H
	3
a6b7a407	4	#include <linux/interrupt.h>
fcd8b7c0 AG	5	#include <rdma/ib_verbs.h>
	6	#include <rdma/rdma_cm.h>
	7	#include "rds.h"
	8	#include "rdma_transport.h"
	9
	10	#define RDS_FASTREG_SIZE 20
	11	#define RDS_FASTREG_POOL_SIZE 2048
	12
	13	#define RDS_IW_MAX_SGE 8
	14	#define RDS_IW_RECV_SGE 2
	15
	16	#define RDS_IW_DEFAULT_RECV_WR 1024
	17	#define RDS_IW_DEFAULT_SEND_WR 256
	18
	19	#define RDS_IW_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
	20
	21	extern struct list_head rds_iw_devices;
	22
	23	/*
	24	* IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
	25	* try and minimize the amount of memory tied up both the device and
	26	* socket receive queues.
	27	*/
	28	/* page offset of the final full frag that fits in the page */
	29	#define RDS_PAGE_LAST_OFF (((PAGE_SIZE / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE)
	30	struct rds_page_frag {
	31	struct list_head f_item;
	32	struct page *f_page;
	33	unsigned long f_offset;
	34	dma_addr_t f_mapped;
	35	};
	36
	37	struct rds_iw_incoming {
	38	struct list_head ii_frags;
	39	struct rds_incoming ii_inc;
	40	};
	41
	42	struct rds_iw_connect_private {
	43	/* Add new fields at the end, and don't permute existing fields. */
	44	__be32 dp_saddr;
	45	__be32 dp_daddr;
	46	u8 dp_protocol_major;
	47	u8 dp_protocol_minor;
	48	__be16 dp_protocol_minor_mask; /* bitmask */
	49	__be32 dp_reserved1;
	50	__be64 dp_ack_seq;
	51	__be32 dp_credit; /* non-zero enables flow ctl */
	52	};
	53
	54	struct rds_iw_scatterlist {
	55	struct scatterlist *list;
	56	unsigned int len;
	57	int dma_len;
	58	unsigned int dma_npages;
	59	unsigned int bytes;
	60	};
	61
	62	struct rds_iw_mapping {
	63	spinlock_t m_lock; /* protect the mapping struct */
	64	struct list_head m_list;
	65	struct rds_iw_mr *m_mr;
	66	uint32_t m_rkey;
	67	struct rds_iw_scatterlist m_sg;
	68	};
69
70	struct rds_iw_send_work {
71	struct rds_message *s_rm;
72
73	/* We should really put these into a union: */
f8b3aaf2	74	struct rm_rdma_op *s_op;
fcd8b7c0 AG	75	struct rds_iw_mapping *s_mapping;
fcd8b7c0 AG	76	struct ib_mr *s_mr;
fcd8b7c0 AG	77	unsigned char s_remap_count;
fcd8b7c0 AG	78
e622f2f4 CH	79	union {
	80	struct ib_send_wr s_send_wr;
	81	struct ib_rdma_wr s_rdma_wr;
9ddc8737	82	struct ib_reg_wr s_reg_wr;
e622f2f4	83	};
fcd8b7c0 AG	84	struct ib_sge s_sge[RDS_IW_MAX_SGE];
	85	unsigned long s_queued;
	86	};
	87
	88	struct rds_iw_recv_work {
	89	struct rds_iw_incoming *r_iwinc;
	90	struct rds_page_frag *r_frag;
	91	struct ib_recv_wr r_wr;
	92	struct ib_sge r_sge[2];
	93	};
	94
	95	struct rds_iw_work_ring {
	96	u32 w_nr;
	97	u32 w_alloc_ptr;
	98	u32 w_alloc_ctr;
	99	u32 w_free_ptr;
	100	atomic_t w_free_ctr;
	101	};
	102
	103	struct rds_iw_device;
	104
	105	struct rds_iw_connection {
	106
	107	struct list_head iw_node;
	108	struct rds_iw_device *rds_iwdev;
	109	struct rds_connection *conn;
	110
	111	/* alphabet soup, IBTA style */
	112	struct rdma_cm_id *i_cm_id;
	113	struct ib_pd *i_pd;
	114	struct ib_mr *i_mr;
	115	struct ib_cq *i_send_cq;
	116	struct ib_cq *i_recv_cq;
	117
	118	/* tx */
	119	struct rds_iw_work_ring i_send_ring;
	120	struct rds_message *i_rm;
	121	struct rds_header *i_send_hdrs;
	122	u64 i_send_hdrs_dma;
	123	struct rds_iw_send_work *i_sends;
	124
	125	/* rx */
d521b63b	126	struct tasklet_struct i_recv_tasklet;
fcd8b7c0 AG	127	struct mutex i_recv_mutex;
	128	struct rds_iw_work_ring i_recv_ring;
	129	struct rds_iw_incoming *i_iwinc;
	130	u32 i_recv_data_rem;
	131	struct rds_header *i_recv_hdrs;
	132	u64 i_recv_hdrs_dma;
	133	struct rds_iw_recv_work *i_recvs;
	134	struct rds_page_frag i_frag;
	135	u64 i_ack_recv; /* last ACK received */
	136
	137	/* sending acks */
	138	unsigned long i_ack_flags;
8cbd9606 AG	139	#ifdef KERNEL_HAS_ATOMIC64
	140	atomic64_t i_ack_next; /* next ACK to send */
	141	#else
	142	spinlock_t i_ack_lock; /* protect i_ack_next */
fcd8b7c0	143	u64 i_ack_next; /* next ACK to send */
8cbd9606	144	#endif
fcd8b7c0 AG	145	struct rds_header *i_ack;
	146	struct ib_send_wr i_ack_wr;
	147	struct ib_sge i_ack_sge;
	148	u64 i_ack_dma;
	149	unsigned long i_ack_queued;
	150
	151	/* Flow control related information
	152	*
	153	* Our algorithm uses a pair variables that we need to access
	154	* atomically - one for the send credits, and one posted
	155	* recv credits we need to transfer to remote.
	156	* Rather than protect them using a slow spinlock, we put both into
	157	* a single atomic_t and update it using cmpxchg
	158	*/
	159	atomic_t i_credits;
	160
	161	/* Protocol version specific information */
	162	unsigned int i_flowctl:1; /* enable/disable flow ctl */
	163	unsigned int i_dma_local_lkey:1;
	164	unsigned int i_fastreg_posted:1; /* fastreg posted on this connection */
	165	/* Batched completions */
	166	unsigned int i_unsignaled_wrs;
	167	long i_unsignaled_bytes;
	168	};
	169
	170	/* This assumes that atomic_t is at least 32 bits */
	171	#define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
	172	#define IB_GET_POST_CREDITS(v) ((v) >> 16)
	173	#define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
	174	#define IB_SET_POST_CREDITS(v) ((v) << 16)
	175
	176	struct rds_iw_cm_id {
	177	struct list_head list;
	178	struct rdma_cm_id *cm_id;
	179	};
	180
	181	struct rds_iw_device {
	182	struct list_head list;
	183	struct list_head cm_id_list;
	184	struct list_head conn_list;
	185	struct ib_device *dev;
	186	struct ib_pd *pd;
	187	struct ib_mr *mr;
	188	struct rds_iw_mr_pool *mr_pool;
fcd8b7c0 AG	189	int max_sge;
	190	unsigned int max_wrs;
	191	unsigned int dma_local_lkey:1;
	192	spinlock_t spinlock; /* protect the above */
	193	};
	194
	195	/* bits for i_ack_flags */
	196	#define IB_ACK_IN_FLIGHT 0
	197	#define IB_ACK_REQUESTED 1
	198
	199	/* Magic WR_ID for ACKs */
	200	#define RDS_IW_ACK_WR_ID ((u64)0xffffffffffffffffULL)
9ddc8737	201	#define RDS_IW_REG_WR_ID ((u64)0xefefefefefefefefULL)
fcd8b7c0 AG	202	#define RDS_IW_LOCAL_INV_WR_ID ((u64)0xdfdfdfdfdfdfdfdfULL)
	203
	204	struct rds_iw_statistics {
	205	uint64_t s_iw_connect_raced;
	206	uint64_t s_iw_listen_closed_stale;
	207	uint64_t s_iw_tx_cq_call;
	208	uint64_t s_iw_tx_cq_event;
	209	uint64_t s_iw_tx_ring_full;
	210	uint64_t s_iw_tx_throttle;
	211	uint64_t s_iw_tx_sg_mapping_failure;
	212	uint64_t s_iw_tx_stalled;
	213	uint64_t s_iw_tx_credit_updates;
	214	uint64_t s_iw_rx_cq_call;
	215	uint64_t s_iw_rx_cq_event;
	216	uint64_t s_iw_rx_ring_empty;
	217	uint64_t s_iw_rx_refill_from_cq;
	218	uint64_t s_iw_rx_refill_from_thread;
	219	uint64_t s_iw_rx_alloc_limit;
	220	uint64_t s_iw_rx_credit_updates;
	221	uint64_t s_iw_ack_sent;
	222	uint64_t s_iw_ack_send_failure;
	223	uint64_t s_iw_ack_send_delayed;
	224	uint64_t s_iw_ack_send_piggybacked;
	225	uint64_t s_iw_ack_received;
	226	uint64_t s_iw_rdma_mr_alloc;
	227	uint64_t s_iw_rdma_mr_free;
	228	uint64_t s_iw_rdma_mr_used;
	229	uint64_t s_iw_rdma_mr_pool_flush;
	230	uint64_t s_iw_rdma_mr_pool_wait;
	231	uint64_t s_iw_rdma_mr_pool_depleted;
	232	};
	233
	234	extern struct workqueue_struct *rds_iw_wq;
	235
	236	/*
	237	* Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
	238	* doesn't define it.
	239	*/
	240	static inline void rds_iw_dma_sync_sg_for_cpu(struct ib_device *dev,
	241	struct scatterlist *sg, unsigned int sg_dma_len, int direction)
	242	{
	243	unsigned int i;
	244
	245	for (i = 0; i < sg_dma_len; ++i) {
	246	ib_dma_sync_single_for_cpu(dev,
	247	ib_sg_dma_address(dev, &sg[i]),
	248	ib_sg_dma_len(dev, &sg[i]),
	249	direction);
	250	}
	251	}
	252	#define ib_dma_sync_sg_for_cpu rds_iw_dma_sync_sg_for_cpu
	253
	254	static inline void rds_iw_dma_sync_sg_for_device(struct ib_device *dev,
	255	struct scatterlist *sg, unsigned int sg_dma_len, int direction)
	256	{
	257	unsigned int i;
	258
	259	for (i = 0; i < sg_dma_len; ++i) {
	260	ib_dma_sync_single_for_device(dev,
	261	ib_sg_dma_address(dev, &sg[i]),
	262	ib_sg_dma_len(dev, &sg[i]),
	263	direction);
	264	}
	265	}
266	#define ib_dma_sync_sg_for_device rds_iw_dma_sync_sg_for_device
267
268	static inline u32 rds_iw_local_dma_lkey(struct rds_iw_connection *ic)
269	{
270	return ic->i_dma_local_lkey ? ic->i_cm_id->device->local_dma_lkey : ic->i_mr->lkey;
271	}
272
273	/* ib.c */
274	extern struct rds_transport rds_iw_transport;
fcd8b7c0 AG	275	extern struct ib_client rds_iw_client;
	276
	277	extern unsigned int fastreg_pool_size;
	278	extern unsigned int fastreg_message_size;
	279
	280	extern spinlock_t iw_nodev_conns_lock;
	281	extern struct list_head iw_nodev_conns;
	282
	283	/* ib_cm.c */
	284	int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp);
	285	void rds_iw_conn_free(void *arg);
	286	int rds_iw_conn_connect(struct rds_connection *conn);
	287	void rds_iw_conn_shutdown(struct rds_connection *conn);
	288	void rds_iw_state_change(struct sock *sk);
ef87b7ea	289	int rds_iw_listen_init(void);
fcd8b7c0 AG	290	void rds_iw_listen_stop(void);
	291	void __rds_iw_conn_error(struct rds_connection conn, const char , ...);
	292	int rds_iw_cm_handle_connect(struct rdma_cm_id *cm_id,
	293	struct rdma_cm_event *event);
	294	int rds_iw_cm_initiate_connect(struct rdma_cm_id *cm_id);
	295	void rds_iw_cm_connect_complete(struct rds_connection *conn,
	296	struct rdma_cm_event *event);
	297
	298
	299	#define rds_iw_conn_error(conn, fmt...) \
	300	__rds_iw_conn_error(conn, KERN_WARNING "RDS/IW: " fmt)
	301
	302	/* ib_rdma.c */
	303	int rds_iw_update_cm_id(struct rds_iw_device rds_iwdev, struct rdma_cm_id cm_id);
745cbcca AG	304	void rds_iw_add_conn(struct rds_iw_device rds_iwdev, struct rds_connection conn);
	305	void rds_iw_remove_conn(struct rds_iw_device rds_iwdev, struct rds_connection conn);
	306	void __rds_iw_destroy_conns(struct list_head list, spinlock_t list_lock);
	307	static inline void rds_iw_destroy_nodev_conns(void)
	308	{
	309	__rds_iw_destroy_conns(&iw_nodev_conns, &iw_nodev_conns_lock);
	310	}
	311	static inline void rds_iw_destroy_conns(struct rds_iw_device *rds_iwdev)
	312	{
	313	__rds_iw_destroy_conns(&rds_iwdev->conn_list, &rds_iwdev->spinlock);
	314	}
fcd8b7c0 AG	315	struct rds_iw_mr_pool rds_iw_create_mr_pool(struct rds_iw_device );
	316	void rds_iw_get_mr_info(struct rds_iw_device rds_iwdev, struct rds_info_rdma_connection iinfo);
	317	void rds_iw_destroy_mr_pool(struct rds_iw_mr_pool *);
	318	void rds_iw_get_mr(struct scatterlist sg, unsigned long nents,
	319	struct rds_sock rs, u32 key_ret);
	320	void rds_iw_sync_mr(void *trans_private, int dir);
	321	void rds_iw_free_mr(void *trans_private, int invalidate);
	322	void rds_iw_flush_mrs(void);
fcd8b7c0 AG	323
fcd8b7c0 AG	324	/* ib_recv.c */
ef87b7ea	325	int rds_iw_recv_init(void);
fcd8b7c0 AG	326	void rds_iw_recv_exit(void);
	327	int rds_iw_recv(struct rds_connection *conn);
	328	int rds_iw_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
	329	gfp_t page_gfp, int prefill);
fcd8b7c0	330	void rds_iw_inc_free(struct rds_incoming *inc);
c310e72c	331	int rds_iw_inc_copy_to_user(struct rds_incoming inc, struct iov_iter to);
fcd8b7c0	332	void rds_iw_recv_cq_comp_handler(struct ib_cq cq, void context);
d521b63b	333	void rds_iw_recv_tasklet_fn(unsigned long data);
fcd8b7c0 AG	334	void rds_iw_recv_init_ring(struct rds_iw_connection *ic);
	335	void rds_iw_recv_clear_ring(struct rds_iw_connection *ic);
	336	void rds_iw_recv_init_ack(struct rds_iw_connection *ic);
	337	void rds_iw_attempt_ack(struct rds_iw_connection *ic);
	338	void rds_iw_ack_send_complete(struct rds_iw_connection *ic);
	339	u64 rds_iw_piggyb_ack(struct rds_iw_connection *ic);
	340
	341	/* ib_ring.c */
	342	void rds_iw_ring_init(struct rds_iw_work_ring *ring, u32 nr);
	343	void rds_iw_ring_resize(struct rds_iw_work_ring *ring, u32 nr);
	344	u32 rds_iw_ring_alloc(struct rds_iw_work_ring ring, u32 val, u32 pos);
	345	void rds_iw_ring_free(struct rds_iw_work_ring *ring, u32 val);
	346	void rds_iw_ring_unalloc(struct rds_iw_work_ring *ring, u32 val);
	347	int rds_iw_ring_empty(struct rds_iw_work_ring *ring);
	348	int rds_iw_ring_low(struct rds_iw_work_ring *ring);
	349	u32 rds_iw_ring_oldest(struct rds_iw_work_ring *ring);
	350	u32 rds_iw_ring_completed(struct rds_iw_work_ring *ring, u32 wr_id, u32 oldest);
	351	extern wait_queue_head_t rds_iw_ring_empty_wait;
	352
	353	/* ib_send.c */
	354	void rds_iw_xmit_complete(struct rds_connection *conn);
	355	int rds_iw_xmit(struct rds_connection conn, struct rds_message rm,
	356	unsigned int hdr_off, unsigned int sg, unsigned int off);
	357	void rds_iw_send_cq_comp_handler(struct ib_cq cq, void context);
	358	void rds_iw_send_init_ring(struct rds_iw_connection *ic);
	359	void rds_iw_send_clear_ring(struct rds_iw_connection *ic);
f8b3aaf2	360	int rds_iw_xmit_rdma(struct rds_connection conn, struct rm_rdma_op op);
fcd8b7c0 AG	361	void rds_iw_send_add_credits(struct rds_connection *conn, unsigned int credits);
	362	void rds_iw_advertise_credits(struct rds_connection *conn, unsigned int posted);
	363	int rds_iw_send_grab_credits(struct rds_iw_connection *ic, u32 wanted,
7b70d033	364	u32 *adv_credits, int need_posted, int max_posted);
fcd8b7c0 AG	365
	366	/* ib_stats.c */
	367	DECLARE_PER_CPU(struct rds_iw_statistics, rds_iw_stats);
	368	#define rds_iw_stats_inc(member) rds_stats_inc_which(rds_iw_stats, member)
	369	unsigned int rds_iw_stats_info_copy(struct rds_info_iterator *iter,
	370	unsigned int avail);
	371
	372	/* ib_sysctl.c */
ef87b7ea	373	int rds_iw_sysctl_init(void);
fcd8b7c0 AG	374	void rds_iw_sysctl_exit(void);
	375	extern unsigned long rds_iw_sysctl_max_send_wr;
	376	extern unsigned long rds_iw_sysctl_max_recv_wr;
	377	extern unsigned long rds_iw_sysctl_max_unsig_wrs;
	378	extern unsigned long rds_iw_sysctl_max_unsig_bytes;
	379	extern unsigned long rds_iw_sysctl_max_recv_allocation;
	380	extern unsigned int rds_iw_sysctl_flow_control;
fcd8b7c0 AG	381
	382	/*
	383	* Helper functions for getting/setting the header and data SGEs in
	384	* RDS packets (not RDMA)
	385	*/
	386	static inline struct ib_sge *
	387	rds_iw_header_sge(struct rds_iw_connection ic, struct ib_sge sge)
	388	{
	389	return &sge[0];
	390	}
	391
	392	static inline struct ib_sge *
	393	rds_iw_data_sge(struct rds_iw_connection ic, struct ib_sge sge)
	394	{
	395	return &sge[1];
	396	}
	397
fcd8b7c0	398	#endif