[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 <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include "rds.h"
#include "rdma_transport.h"

#define RDS_FMR_1M_POOL_SIZE		(8192 / 2)
#define RDS_FMR_1M_MSG_SIZE		256
#define RDS_FMR_8K_MSG_SIZE		2
#define RDS_MR_8K_SCALE			(256 / (RDS_FMR_8K_MSG_SIZE + 1))
#define RDS_FMR_8K_POOL_SIZE		(RDS_MR_8K_SCALE * (8192 / 2))

#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 */

#define RDS_IB_RECYCLE_BATCH_COUNT	32

#define RDS_IB_WC_MAX			32

extern struct rw_semaphore rds_ib_devices_lock;
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.
 */
struct rds_page_frag {
	struct list_head	f_item;
	struct list_head	f_cache_entry;
	struct scatterlist	f_sg;
};

struct rds_ib_incoming {
	struct list_head	ii_frags;
	struct list_head	ii_cache_entry;
	struct rds_incoming	ii_inc;
};

struct rds_ib_cache_head {
	struct list_head *first;
	unsigned long count;
};

struct rds_ib_refill_cache {
	struct rds_ib_cache_head __percpu *percpu;
	struct list_head	 *xfer;
	struct list_head	 *ready;
};

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 {
	void			*s_op;
	union {
		struct ib_send_wr	s_wr;
		struct ib_rdma_wr	s_rdma_wr;
		struct ib_atomic_wr	s_atomic_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;
};

/* Rings are posted with all the allocations they'll need to queue the
 * incoming message to the receiving socket so this can't fail.
 * All fragments start with a header, so we can make sure we're not receiving
 * garbage, and we can tell a small 8 byte fragment from an ACK frame.
 */
struct rds_ib_ack_state {
	u64		ack_next;
	u64		ack_recv;
	unsigned int	ack_required:1;
	unsigned int	ack_next_valid:1;
	unsigned int	ack_recv_valid:1;
};


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_cq		*i_send_cq;
	struct ib_cq		*i_recv_cq;
	struct ib_wc		i_send_wc[RDS_IB_WC_MAX];
	struct ib_wc		i_recv_wc[RDS_IB_WC_MAX];

	/* interrupt handling */
	struct tasklet_struct	i_send_tasklet;
	struct tasklet_struct	i_recv_tasklet;

	/* tx */
	struct rds_ib_work_ring	i_send_ring;
	struct rm_data_op	*i_data_op;
	struct rds_header	*i_send_hdrs;
	u64			i_send_hdrs_dma;
	struct rds_ib_send_work *i_sends;
	atomic_t		i_signaled_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;
	u64			i_ack_recv;	/* last ACK received */
	struct rds_ib_refill_cache i_cache_incs;
	struct rds_ib_refill_cache i_cache_frags;

	/* 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;
};

/* 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 rcu_head		rcu;
};

enum {
	RDS_IB_MR_8K_POOL,
	RDS_IB_MR_1M_POOL,
};

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;
	unsigned int		max_fmrs;
	struct rds_ib_mr_pool	*mr_1m_pool;
	struct rds_ib_mr_pool   *mr_8k_pool;
	unsigned int		fmr_max_remaps;
	unsigned int		max_8k_fmrs;
	unsigned int		max_1m_fmrs;
	int			max_sge;
	unsigned int		max_wrs;
	unsigned int		max_initiator_depth;
	unsigned int		max_responder_resources;
	spinlock_t		spinlock;	/* protect the above */
	atomic_t		refcount;
	struct work_struct	free_work;
};

#define ibdev_to_node(ibdev) dev_to_node(ibdev->dma_device)
#define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)

/* 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_evt_handler_call;
	uint64_t	s_ib_tasklet_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_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_8k_alloc;
	uint64_t	s_ib_rdma_mr_8k_free;
	uint64_t	s_ib_rdma_mr_8k_used;
	uint64_t	s_ib_rdma_mr_8k_pool_flush;
	uint64_t	s_ib_rdma_mr_8k_pool_wait;
	uint64_t	s_ib_rdma_mr_8k_pool_depleted;
	uint64_t	s_ib_rdma_mr_1m_alloc;
	uint64_t	s_ib_rdma_mr_1m_free;
	uint64_t	s_ib_rdma_mr_1m_used;
	uint64_t	s_ib_rdma_mr_1m_pool_flush;
	uint64_t	s_ib_rdma_mr_1m_pool_wait;
	uint64_t	s_ib_rdma_mr_1m_pool_depleted;
	uint64_t	s_ib_atomic_cswp;
	uint64_t	s_ib_atomic_fadd;
};

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 *sglist,
					      unsigned int sg_dma_len,
					      int direction)
{
	struct scatterlist *sg;
	unsigned int i;

	for_each_sg(sglist, sg, sg_dma_len, i) {
		ib_dma_sync_single_for_cpu(dev,
				ib_sg_dma_address(dev, sg),
				ib_sg_dma_len(dev, sg),
				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 *sglist,
						 unsigned int sg_dma_len,
						 int direction)
{
	struct scatterlist *sg;
	unsigned int i;

	for_each_sg(sglist, sg, sg_dma_len, i) {
		ib_dma_sync_single_for_device(dev,
				ib_sg_dma_address(dev, sg),
				ib_sg_dma_len(dev, sg),
				direction);
	}
}
#define ib_dma_sync_sg_for_device	rds_ib_dma_sync_sg_for_device


/* ib.c */
extern struct rds_transport rds_ib_transport;
struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
extern struct ib_client rds_ib_client;

extern unsigned int rds_ib_fmr_1m_pool_size;
extern unsigned int rds_ib_fmr_8k_pool_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 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_nodev_conns(void);
struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_dev,
					     int npages);
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);
int rds_ib_fmr_init(void);
void rds_ib_fmr_exit(void);

/* ib_recv.c */
int rds_ib_recv_init(void);
void rds_ib_recv_exit(void);
int rds_ib_recv(struct rds_connection *conn);
int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
void rds_ib_inc_free(struct rds_incoming *inc);
int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc,
			     struct rds_ib_ack_state *state);
void rds_ib_recv_tasklet_fn(unsigned long data);
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);
void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);

/* 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_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
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 rm_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);
int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);

/* 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 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;

#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>
a6b7a407	6	#include <linux/interrupt.h>
e4c52c98 AG	7	#include <linux/pci.h>
e4c52c98 AG	8	#include <linux/slab.h>
ec16227e AG	9	#include "rds.h"
	10	#include "rdma_transport.h"
	11
06766513 SS	12	#define RDS_FMR_1M_POOL_SIZE (8192 / 2)
	13	#define RDS_FMR_1M_MSG_SIZE 256
	14	#define RDS_FMR_8K_MSG_SIZE 2
	15	#define RDS_MR_8K_SCALE (256 / (RDS_FMR_8K_MSG_SIZE + 1))
	16	#define RDS_FMR_8K_POOL_SIZE (RDS_MR_8K_SCALE * (8192 / 2))
ec16227e AG	17
	18	#define RDS_IB_MAX_SGE 8
	19	#define RDS_IB_RECV_SGE 2
	20
	21	#define RDS_IB_DEFAULT_RECV_WR 1024
	22	#define RDS_IB_DEFAULT_SEND_WR 256
	23
3ba23ade AG	24	#define RDS_IB_DEFAULT_RETRY_COUNT 2
3ba23ade AG	25
ec16227e AG	26	#define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
ec16227e AG	27
33244125 CM	28	#define RDS_IB_RECYCLE_BATCH_COUNT 32
33244125 CM	29
f4f943c9 SS	30	#define RDS_IB_WC_MAX 32
f4f943c9 SS	31
ea819867	32	extern struct rw_semaphore rds_ib_devices_lock;
ec16227e AG	33	extern struct list_head rds_ib_devices;
	34
	35	/*
	36	* IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
	37	* try and minimize the amount of memory tied up both the device and
	38	* socket receive queues.
	39	*/
ec16227e AG	40	struct rds_page_frag {
ec16227e AG	41	struct list_head f_item;
33244125	42	struct list_head f_cache_entry;
0b088e00	43	struct scatterlist f_sg;
ec16227e AG	44	};
	45
	46	struct rds_ib_incoming {
	47	struct list_head ii_frags;
33244125	48	struct list_head ii_cache_entry;
ec16227e AG	49	struct rds_incoming ii_inc;
	50	};
	51
33244125 CM	52	struct rds_ib_cache_head {
	53	struct list_head *first;
	54	unsigned long count;
	55	};
	56
	57	struct rds_ib_refill_cache {
ae4b46e9	58	struct rds_ib_cache_head __percpu *percpu;
33244125 CM	59	struct list_head *xfer;
	60	struct list_head *ready;
	61	};
	62
ec16227e AG	63	struct rds_ib_connect_private {
	64	/* Add new fields at the end, and don't permute existing fields. */
	65	__be32 dp_saddr;
	66	__be32 dp_daddr;
	67	u8 dp_protocol_major;
	68	u8 dp_protocol_minor;
	69	__be16 dp_protocol_minor_mask; /* bitmask */
	70	__be32 dp_reserved1;
	71	__be64 dp_ack_seq;
	72	__be32 dp_credit; /* non-zero enables flow ctl */
	73	};
	74
	75	struct rds_ib_send_work {
ff3d7d36	76	void *s_op;
e622f2f4 CH	77	union {
	78	struct ib_send_wr s_wr;
	79	struct ib_rdma_wr s_rdma_wr;
	80	struct ib_atomic_wr s_atomic_wr;
	81	};
ec16227e AG	82	struct ib_sge s_sge[RDS_IB_MAX_SGE];
	83	unsigned long s_queued;
	84	};
	85
	86	struct rds_ib_recv_work {
	87	struct rds_ib_incoming *r_ibinc;
	88	struct rds_page_frag *r_frag;
	89	struct ib_recv_wr r_wr;
	90	struct ib_sge r_sge[2];
	91	};
	92
	93	struct rds_ib_work_ring {
	94	u32 w_nr;
	95	u32 w_alloc_ptr;
	96	u32 w_alloc_ctr;
	97	u32 w_free_ptr;
	98	atomic_t w_free_ctr;
	99	};
	100
f4f943c9 SS	101	/* Rings are posted with all the allocations they'll need to queue the
	102	* incoming message to the receiving socket so this can't fail.
	103	* All fragments start with a header, so we can make sure we're not receiving
	104	* garbage, and we can tell a small 8 byte fragment from an ACK frame.
	105	*/
	106	struct rds_ib_ack_state {
	107	u64 ack_next;
	108	u64 ack_recv;
	109	unsigned int ack_required:1;
	110	unsigned int ack_next_valid:1;
	111	unsigned int ack_recv_valid:1;
	112	};
	113
	114
ec16227e AG	115	struct rds_ib_device;
	116
	117	struct rds_ib_connection {
	118
	119	struct list_head ib_node;
	120	struct rds_ib_device *rds_ibdev;
	121	struct rds_connection *conn;
	122
	123	/* alphabet soup, IBTA style */
	124	struct rdma_cm_id *i_cm_id;
	125	struct ib_pd *i_pd;
ec16227e AG	126	struct ib_cq *i_send_cq;
ec16227e AG	127	struct ib_cq *i_recv_cq;
0c28c045	128	struct ib_wc i_send_wc[RDS_IB_WC_MAX];
f4f943c9 SS	129	struct ib_wc i_recv_wc[RDS_IB_WC_MAX];
	130
	131	/* interrupt handling */
0c28c045	132	struct tasklet_struct i_send_tasklet;
f4f943c9	133	struct tasklet_struct i_recv_tasklet;
ec16227e AG	134
	135	/* tx */
	136	struct rds_ib_work_ring i_send_ring;
ff3d7d36	137	struct rm_data_op *i_data_op;
ec16227e AG	138	struct rds_header *i_send_hdrs;
	139	u64 i_send_hdrs_dma;
	140	struct rds_ib_send_work *i_sends;
f046011c	141	atomic_t i_signaled_sends;
ec16227e AG	142
	143	/* rx */
	144	struct mutex i_recv_mutex;
	145	struct rds_ib_work_ring i_recv_ring;
	146	struct rds_ib_incoming *i_ibinc;
	147	u32 i_recv_data_rem;
	148	struct rds_header *i_recv_hdrs;
	149	u64 i_recv_hdrs_dma;
	150	struct rds_ib_recv_work *i_recvs;
ec16227e	151	u64 i_ack_recv; /* last ACK received */
33244125 CM	152	struct rds_ib_refill_cache i_cache_incs;
33244125 CM	153	struct rds_ib_refill_cache i_cache_frags;
ec16227e AG	154
	155	/* sending acks */
	156	unsigned long i_ack_flags;
8cbd9606 AG	157	#ifdef KERNEL_HAS_ATOMIC64
	158	atomic64_t i_ack_next; /* next ACK to send */
	159	#else
	160	spinlock_t i_ack_lock; /* protect i_ack_next */
ec16227e	161	u64 i_ack_next; /* next ACK to send */
8cbd9606	162	#endif
ec16227e AG	163	struct rds_header *i_ack;
	164	struct ib_send_wr i_ack_wr;
	165	struct ib_sge i_ack_sge;
	166	u64 i_ack_dma;
	167	unsigned long i_ack_queued;
	168
	169	/* Flow control related information
	170	*
	171	* Our algorithm uses a pair variables that we need to access
	172	* atomically - one for the send credits, and one posted
	173	* recv credits we need to transfer to remote.
	174	* Rather than protect them using a slow spinlock, we put both into
	175	* a single atomic_t and update it using cmpxchg
	176	*/
	177	atomic_t i_credits;
	178
	179	/* Protocol version specific information */
	180	unsigned int i_flowctl:1; /* enable/disable flow ctl */
	181
	182	/* Batched completions */
	183	unsigned int i_unsignaled_wrs;
ec16227e AG	184	};
	185
	186	/* This assumes that atomic_t is at least 32 bits */
	187	#define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
	188	#define IB_GET_POST_CREDITS(v) ((v) >> 16)
	189	#define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
	190	#define IB_SET_POST_CREDITS(v) ((v) << 16)
	191
	192	struct rds_ib_ipaddr {
	193	struct list_head list;
	194	__be32 ipaddr;
59fe4606	195	struct rcu_head rcu;
ec16227e AG	196	};
ec16227e AG	197
06766513 SS	198	enum {
	199	RDS_IB_MR_8K_POOL,
	200	RDS_IB_MR_1M_POOL,
	201	};
	202
ec16227e AG	203	struct rds_ib_device {
	204	struct list_head list;
	205	struct list_head ipaddr_list;
	206	struct list_head conn_list;
	207	struct ib_device *dev;
	208	struct ib_pd *pd;
ec16227e	209	unsigned int max_fmrs;
06766513 SS	210	struct rds_ib_mr_pool *mr_1m_pool;
	211	struct rds_ib_mr_pool *mr_8k_pool;
	212	unsigned int fmr_max_remaps;
	213	unsigned int max_8k_fmrs;
	214	unsigned int max_1m_fmrs;
ec16227e AG	215	int max_sge;
ec16227e AG	216	unsigned int max_wrs;
40589e74 AG	217	unsigned int max_initiator_depth;
40589e74 AG	218	unsigned int max_responder_resources;
ec16227e	219	spinlock_t spinlock; /* protect the above */
3e0249f9 ZB	220	atomic_t refcount;
3e0249f9 ZB	221	struct work_struct free_work;
ec16227e AG	222	};
ec16227e AG	223
a0c6ffbc	224	#define ibdev_to_node(ibdev) dev_to_node(ibdev->dma_device)
e4c52c98 AG	225	#define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
e4c52c98 AG	226
ec16227e AG	227	/* bits for i_ack_flags */
	228	#define IB_ACK_IN_FLIGHT 0
	229	#define IB_ACK_REQUESTED 1
	230
	231	/* Magic WR_ID for ACKs */
	232	#define RDS_IB_ACK_WR_ID (~(u64) 0)
	233
	234	struct rds_ib_statistics {
	235	uint64_t s_ib_connect_raced;
	236	uint64_t s_ib_listen_closed_stale;
f4f943c9 SS	237	uint64_t s_ib_evt_handler_call;
f4f943c9 SS	238	uint64_t s_ib_tasklet_call;
ec16227e AG	239	uint64_t s_ib_tx_cq_event;
	240	uint64_t s_ib_tx_ring_full;
	241	uint64_t s_ib_tx_throttle;
	242	uint64_t s_ib_tx_sg_mapping_failure;
	243	uint64_t s_ib_tx_stalled;
	244	uint64_t s_ib_tx_credit_updates;
ec16227e AG	245	uint64_t s_ib_rx_cq_event;
	246	uint64_t s_ib_rx_ring_empty;
	247	uint64_t s_ib_rx_refill_from_cq;
	248	uint64_t s_ib_rx_refill_from_thread;
	249	uint64_t s_ib_rx_alloc_limit;
	250	uint64_t s_ib_rx_credit_updates;
	251	uint64_t s_ib_ack_sent;
	252	uint64_t s_ib_ack_send_failure;
	253	uint64_t s_ib_ack_send_delayed;
	254	uint64_t s_ib_ack_send_piggybacked;
	255	uint64_t s_ib_ack_received;
06766513 SS	256	uint64_t s_ib_rdma_mr_8k_alloc;
	257	uint64_t s_ib_rdma_mr_8k_free;
	258	uint64_t s_ib_rdma_mr_8k_used;
	259	uint64_t s_ib_rdma_mr_8k_pool_flush;
	260	uint64_t s_ib_rdma_mr_8k_pool_wait;
	261	uint64_t s_ib_rdma_mr_8k_pool_depleted;
	262	uint64_t s_ib_rdma_mr_1m_alloc;
	263	uint64_t s_ib_rdma_mr_1m_free;
	264	uint64_t s_ib_rdma_mr_1m_used;
	265	uint64_t s_ib_rdma_mr_1m_pool_flush;
	266	uint64_t s_ib_rdma_mr_1m_pool_wait;
	267	uint64_t s_ib_rdma_mr_1m_pool_depleted;
51e2cba8 AG	268	uint64_t s_ib_atomic_cswp;
51e2cba8 AG	269	uint64_t s_ib_atomic_fadd;
ec16227e AG	270	};
	271
	272	extern struct workqueue_struct *rds_ib_wq;
	273
	274	/*
	275	* Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
	276	* doesn't define it.
	277	*/
	278	static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
d2a9ec64 FF	279	struct scatterlist *sglist,
	280	unsigned int sg_dma_len,
	281	int direction)
ec16227e	282	{
d2a9ec64	283	struct scatterlist *sg;
ec16227e AG	284	unsigned int i;
ec16227e AG	285
d2a9ec64	286	for_each_sg(sglist, sg, sg_dma_len, i) {
ec16227e	287	ib_dma_sync_single_for_cpu(dev,
d2a9ec64 FF	288	ib_sg_dma_address(dev, sg),
d2a9ec64 FF	289	ib_sg_dma_len(dev, sg),
ec16227e AG	290	direction);
	291	}
	292	}
	293	#define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu
	294
	295	static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
d2a9ec64 FF	296	struct scatterlist *sglist,
	297	unsigned int sg_dma_len,
	298	int direction)
ec16227e	299	{
d2a9ec64	300	struct scatterlist *sg;
ec16227e AG	301	unsigned int i;
ec16227e AG	302
d2a9ec64	303	for_each_sg(sglist, sg, sg_dma_len, i) {
ec16227e	304	ib_dma_sync_single_for_device(dev,
d2a9ec64 FF	305	ib_sg_dma_address(dev, sg),
d2a9ec64 FF	306	ib_sg_dma_len(dev, sg),
ec16227e AG	307	direction);
	308	}
	309	}
	310	#define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device
	311
	312
	313	/* ib.c */
	314	extern struct rds_transport rds_ib_transport;
3e0249f9 ZB	315	struct rds_ib_device rds_ib_get_client_data(struct ib_device device);
3e0249f9 ZB	316	void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
ec16227e AG	317	extern struct ib_client rds_ib_client;
ec16227e AG	318
06766513 SS	319	extern unsigned int rds_ib_fmr_1m_pool_size;
06766513 SS	320	extern unsigned int rds_ib_fmr_8k_pool_size;
3ba23ade	321	extern unsigned int rds_ib_retry_count;
ec16227e AG	322
	323	extern spinlock_t ib_nodev_conns_lock;
	324	extern struct list_head ib_nodev_conns;
	325
	326	/* ib_cm.c */
	327	int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
	328	void rds_ib_conn_free(void *arg);
	329	int rds_ib_conn_connect(struct rds_connection *conn);
	330	void rds_ib_conn_shutdown(struct rds_connection *conn);
	331	void rds_ib_state_change(struct sock *sk);
ef87b7ea	332	int rds_ib_listen_init(void);
ec16227e AG	333	void rds_ib_listen_stop(void);
	334	void __rds_ib_conn_error(struct rds_connection conn, const char , ...);
	335	int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
	336	struct rdma_cm_event *event);
	337	int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
	338	void rds_ib_cm_connect_complete(struct rds_connection *conn,
	339	struct rdma_cm_event *event);
	340
	341
	342	#define rds_ib_conn_error(conn, fmt...) \
	343	__rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
	344
	345	/* ib_rdma.c */
	346	int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
745cbcca AG	347	void rds_ib_add_conn(struct rds_ib_device rds_ibdev, struct rds_connection conn);
745cbcca AG	348	void rds_ib_remove_conn(struct rds_ib_device rds_ibdev, struct rds_connection conn);
8aeb1ba6	349	void rds_ib_destroy_nodev_conns(void);
06766513 SS	350	struct rds_ib_mr_pool rds_ib_create_mr_pool(struct rds_ib_device rds_dev,
06766513 SS	351	int npages);
ec16227e AG	352	void rds_ib_get_mr_info(struct rds_ib_device rds_ibdev, struct rds_info_rdma_connection iinfo);
	353	void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
	354	void rds_ib_get_mr(struct scatterlist sg, unsigned long nents,
	355	struct rds_sock rs, u32 key_ret);
	356	void rds_ib_sync_mr(void *trans_private, int dir);
	357	void rds_ib_free_mr(void *trans_private, int invalidate);
	358	void rds_ib_flush_mrs(void);
ad1d7dc0	359	int rds_ib_fmr_init(void);
ad1d7dc0	360	void rds_ib_fmr_exit(void);
ec16227e AG	361
ec16227e AG	362	/* ib_recv.c */
ef87b7ea	363	int rds_ib_recv_init(void);
ec16227e AG	364	void rds_ib_recv_exit(void);
ec16227e AG	365	int rds_ib_recv(struct rds_connection *conn);
33244125 CM	366	int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
33244125 CM	367	void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
73ce4317	368	void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
ec16227e	369	void rds_ib_inc_free(struct rds_incoming *inc);
c310e72c	370	int rds_ib_inc_copy_to_user(struct rds_incoming inc, struct iov_iter to);
f4f943c9 SS	371	void rds_ib_recv_cqe_handler(struct rds_ib_connection ic, struct ib_wc wc,
f4f943c9 SS	372	struct rds_ib_ack_state *state);
d521b63b	373	void rds_ib_recv_tasklet_fn(unsigned long data);
ec16227e AG	374	void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
	375	void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
	376	void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
	377	void rds_ib_attempt_ack(struct rds_ib_connection *ic);
	378	void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
	379	u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
f4f943c9	380	void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
ec16227e AG	381
	382	/* ib_ring.c */
	383	void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
	384	void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
	385	u32 rds_ib_ring_alloc(struct rds_ib_work_ring ring, u32 val, u32 pos);
	386	void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
	387	void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
	388	int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
	389	int rds_ib_ring_low(struct rds_ib_work_ring *ring);
	390	u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
	391	u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
	392	extern wait_queue_head_t rds_ib_ring_empty_wait;
	393
	394	/* ib_send.c */
	395	void rds_ib_xmit_complete(struct rds_connection *conn);
	396	int rds_ib_xmit(struct rds_connection conn, struct rds_message rm,
	397	unsigned int hdr_off, unsigned int sg, unsigned int off);
0c28c045	398	void rds_ib_send_cqe_handler(struct rds_ib_connection ic, struct ib_wc wc);
ec16227e AG	399	void rds_ib_send_init_ring(struct rds_ib_connection *ic);
ec16227e AG	400	void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
f8b3aaf2	401	int rds_ib_xmit_rdma(struct rds_connection conn, struct rm_rdma_op op);
ec16227e AG	402	void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
	403	void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
	404	int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
7b70d033	405	u32 *adv_credits, int need_posted, int max_posted);
ff3d7d36	406	int rds_ib_xmit_atomic(struct rds_connection conn, struct rm_atomic_op op);
ec16227e AG	407
	408	/* ib_stats.c */
	409	DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
	410	#define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
	411	unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
	412	unsigned int avail);
	413
	414	/* ib_sysctl.c */
ef87b7ea	415	int rds_ib_sysctl_init(void);
ec16227e AG	416	void rds_ib_sysctl_exit(void);
	417	extern unsigned long rds_ib_sysctl_max_send_wr;
	418	extern unsigned long rds_ib_sysctl_max_recv_wr;
	419	extern unsigned long rds_ib_sysctl_max_unsig_wrs;
	420	extern unsigned long rds_ib_sysctl_max_unsig_bytes;
	421	extern unsigned long rds_ib_sysctl_max_recv_allocation;
	422	extern unsigned int rds_ib_sysctl_flow_control;
ec16227e	423
ec16227e	424	#endif