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

/* SPDX-License-Identifier: GPL-2.0 */
#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_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_FR_WR		256
#define RDS_IB_DEFAULT_FR_INV_WR	256

#define RDS_IB_DEFAULT_RETRY_COUNT	1

#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;
};

/* This is the common structure for the IB private data exchange in setting up
 * an RDS connection.  The exchange is different for IPv4 and IPv6 connections.
 * The reason is that the address size is different and the addresses
 * exchanged are in the beginning of the structure.  Hence it is not possible
 * for interoperability if same structure is used.
 */
struct rds_ib_conn_priv_cmn {
	u8			ricpc_protocol_major;
	u8			ricpc_protocol_minor;
	__be16			ricpc_protocol_minor_mask;	/* bitmask */
	__be32			ricpc_reserved1;
	__be64			ricpc_ack_seq;
	__be32			ricpc_credit;	/* non-zero enables flow ctl */
};

struct rds_ib_connect_private {
	/* Add new fields at the end, and don't permute existing fields. */
	__be32				dp_saddr;
	__be32				dp_daddr;
	struct rds_ib_conn_priv_cmn	dp_cmn;
};

struct rds6_ib_connect_private {
	/* Add new fields at the end, and don't permute existing fields. */
	struct in6_addr			dp_saddr;
	struct in6_addr			dp_daddr;
	struct rds_ib_conn_priv_cmn	dp_cmn;
};

#define dp_protocol_major	dp_cmn.ricpc_protocol_major
#define dp_protocol_minor	dp_cmn.ricpc_protocol_minor
#define dp_protocol_minor_mask	dp_cmn.ricpc_protocol_minor_mask
#define dp_ack_seq		dp_cmn.ricpc_ack_seq
#define dp_credit		dp_cmn.ricpc_credit

union rds_ib_conn_priv {
	struct rds_ib_connect_private	ricp_v4;
	struct rds6_ib_connect_private	ricp_v6;
};

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];

	/* To control the number of wrs from fastreg */
	atomic_t		i_fastreg_wrs;
	atomic_t		i_fastunreg_wrs;

	/* 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;
	dma_addr_t		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;
	dma_addr_t		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;
	atomic_t		i_cache_allocs;

	/* 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;
	dma_addr_t		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;

	/* Endpoint role in connection */
	bool			i_active_side;
	atomic_t		i_cq_quiesce;

	/* Send/Recv vectors */
	int			i_scq_vector;
	int			i_rcq_vector;
};

/* 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;
	bool                    use_fastreg;

	unsigned int		max_mrs;
	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_mrs;
	unsigned int		max_1m_mrs;
	int			max_sge;
	unsigned int		max_wrs;
	unsigned int		max_initiator_depth;
	unsigned int		max_responder_resources;
	spinlock_t		spinlock;	/* protect the above */
	refcount_t		refcount;
	struct work_struct	free_work;
	int			*vector_load;
};

#define ibdev_to_node(ibdev) dev_to_node((ibdev)->dev.parent)
#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_total_frags;
	uint64_t	s_ib_rx_total_incs;
	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_rdma_mr_8k_reused;
	uint64_t	s_ib_rdma_mr_1m_reused;
	uint64_t	s_ib_atomic_cswp;
	uint64_t	s_ib_atomic_fadd;
	uint64_t	s_ib_recv_added_to_cache;
	uint64_t	s_ib_recv_removed_from_cache;
};

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_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_path_connect(struct rds_conn_path *cp);
void rds_ib_conn_path_shutdown(struct rds_conn_path *cp);
void rds_ib_state_change(struct sock *sk);
int rds_ib_listen_init(void);
void rds_ib_listen_stop(void);
__printf(2, 3)
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, bool isv6);
int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id, bool isv6);
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,
			 struct in6_addr *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);
void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);

/* ib_recv.c */
int rds_ib_recv_init(void);
void rds_ib_recv_exit(void);
int rds_ib_recv_path(struct rds_conn_path *conn);
int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic, gfp_t gfp);
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_path_complete(struct rds_conn_path *cp);
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)
#define rds_ib_stats_add(member, count) \
		rds_stats_add_which(rds_ib_stats, member, count)
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
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
ec16227e AG	2	#ifndef _RDS_IB_H
	3	#define _RDS_IB_H
	4
	5	#include <rdma/ib_verbs.h>
	6	#include <rdma/rdma_cm.h>
a6b7a407	7	#include <linux/interrupt.h>
e4c52c98 AG	8	#include <linux/pci.h>
e4c52c98 AG	9	#include <linux/slab.h>
ec16227e AG	10	#include "rds.h"
	11	#include "rdma_transport.h"
	12
ec16227e AG	13	#define RDS_IB_MAX_SGE 8
	14	#define RDS_IB_RECV_SGE 2
	15
	16	#define RDS_IB_DEFAULT_RECV_WR 1024
	17	#define RDS_IB_DEFAULT_SEND_WR 256
56012459 SS	18	#define RDS_IB_DEFAULT_FR_WR 256
56012459 SS	19	#define RDS_IB_DEFAULT_FR_INV_WR 256
ec16227e	20
fab8688d	21	#define RDS_IB_DEFAULT_RETRY_COUNT 1
3ba23ade	22
ec16227e AG	23	#define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
ec16227e AG	24
33244125 CM	25	#define RDS_IB_RECYCLE_BATCH_COUNT 32
33244125 CM	26
f4f943c9 SS	27	#define RDS_IB_WC_MAX 32
f4f943c9 SS	28
ea819867	29	extern struct rw_semaphore rds_ib_devices_lock;
ec16227e AG	30	extern struct list_head rds_ib_devices;
	31
	32	/*
	33	* IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
	34	* try and minimize the amount of memory tied up both the device and
	35	* socket receive queues.
	36	*/
ec16227e AG	37	struct rds_page_frag {
ec16227e AG	38	struct list_head f_item;
33244125	39	struct list_head f_cache_entry;
0b088e00	40	struct scatterlist f_sg;
ec16227e AG	41	};
	42
	43	struct rds_ib_incoming {
	44	struct list_head ii_frags;
33244125	45	struct list_head ii_cache_entry;
ec16227e AG	46	struct rds_incoming ii_inc;
	47	};
	48
33244125 CM	49	struct rds_ib_cache_head {
	50	struct list_head *first;
	51	unsigned long count;
	52	};
	53
	54	struct rds_ib_refill_cache {
ae4b46e9	55	struct rds_ib_cache_head __percpu *percpu;
33244125 CM	56	struct list_head *xfer;
	57	struct list_head *ready;
	58	};
	59
eee2fa6a KCP	60	/* This is the common structure for the IB private data exchange in setting up
	61	* an RDS connection. The exchange is different for IPv4 and IPv6 connections.
	62	* The reason is that the address size is different and the addresses
	63	* exchanged are in the beginning of the structure. Hence it is not possible
	64	* for interoperability if same structure is used.
	65	*/
	66	struct rds_ib_conn_priv_cmn {
	67	u8 ricpc_protocol_major;
	68	u8 ricpc_protocol_minor;
	69	__be16 ricpc_protocol_minor_mask; /* bitmask */
	70	__be32 ricpc_reserved1;
	71	__be64 ricpc_ack_seq;
	72	__be32 ricpc_credit; /* non-zero enables flow ctl */
	73	};
	74
ec16227e AG	75	struct rds_ib_connect_private {
ec16227e AG	76	/* Add new fields at the end, and don't permute existing fields. */
eee2fa6a KCP	77	__be32 dp_saddr;
	78	__be32 dp_daddr;
	79	struct rds_ib_conn_priv_cmn dp_cmn;
	80	};
	81
	82	struct rds6_ib_connect_private {
	83	/* Add new fields at the end, and don't permute existing fields. */
	84	struct in6_addr dp_saddr;
	85	struct in6_addr dp_daddr;
	86	struct rds_ib_conn_priv_cmn dp_cmn;
	87	};
	88
	89	#define dp_protocol_major dp_cmn.ricpc_protocol_major
	90	#define dp_protocol_minor dp_cmn.ricpc_protocol_minor
	91	#define dp_protocol_minor_mask dp_cmn.ricpc_protocol_minor_mask
	92	#define dp_ack_seq dp_cmn.ricpc_ack_seq
	93	#define dp_credit dp_cmn.ricpc_credit
	94
	95	union rds_ib_conn_priv {
	96	struct rds_ib_connect_private ricp_v4;
	97	struct rds6_ib_connect_private ricp_v6;
ec16227e AG	98	};
	99
	100	struct rds_ib_send_work {
ff3d7d36	101	void *s_op;
e622f2f4 CH	102	union {
	103	struct ib_send_wr s_wr;
	104	struct ib_rdma_wr s_rdma_wr;
	105	struct ib_atomic_wr s_atomic_wr;
	106	};
ec16227e AG	107	struct ib_sge s_sge[RDS_IB_MAX_SGE];
	108	unsigned long s_queued;
	109	};
	110
	111	struct rds_ib_recv_work {
	112	struct rds_ib_incoming *r_ibinc;
	113	struct rds_page_frag *r_frag;
	114	struct ib_recv_wr r_wr;
	115	struct ib_sge r_sge[2];
	116	};
	117
	118	struct rds_ib_work_ring {
	119	u32 w_nr;
	120	u32 w_alloc_ptr;
	121	u32 w_alloc_ctr;
	122	u32 w_free_ptr;
	123	atomic_t w_free_ctr;
	124	};
	125
f4f943c9 SS	126	/* Rings are posted with all the allocations they'll need to queue the
	127	* incoming message to the receiving socket so this can't fail.
	128	* All fragments start with a header, so we can make sure we're not receiving
	129	* garbage, and we can tell a small 8 byte fragment from an ACK frame.
	130	*/
	131	struct rds_ib_ack_state {
	132	u64 ack_next;
	133	u64 ack_recv;
	134	unsigned int ack_required:1;
	135	unsigned int ack_next_valid:1;
	136	unsigned int ack_recv_valid:1;
	137	};
	138
	139
ec16227e AG	140	struct rds_ib_device;
	141
	142	struct rds_ib_connection {
	143
	144	struct list_head ib_node;
	145	struct rds_ib_device *rds_ibdev;
	146	struct rds_connection *conn;
	147
	148	/* alphabet soup, IBTA style */
	149	struct rdma_cm_id *i_cm_id;
	150	struct ib_pd *i_pd;
ec16227e AG	151	struct ib_cq *i_send_cq;
ec16227e AG	152	struct ib_cq *i_recv_cq;
0c28c045	153	struct ib_wc i_send_wc[RDS_IB_WC_MAX];
f4f943c9 SS	154	struct ib_wc i_recv_wc[RDS_IB_WC_MAX];
f4f943c9 SS	155
ad6832f9	156	/* To control the number of wrs from fastreg */
ad6832f9	157	atomic_t i_fastreg_wrs;
56012459	158	atomic_t i_fastunreg_wrs;
ad6832f9	159
f4f943c9	160	/* interrupt handling */
0c28c045	161	struct tasklet_struct i_send_tasklet;
f4f943c9	162	struct tasklet_struct i_recv_tasklet;
ec16227e AG	163
	164	/* tx */
	165	struct rds_ib_work_ring i_send_ring;
ff3d7d36	166	struct rm_data_op *i_data_op;
ec16227e	167	struct rds_header *i_send_hdrs;
d43dbacf	168	dma_addr_t i_send_hdrs_dma;
ec16227e	169	struct rds_ib_send_work *i_sends;
f046011c	170	atomic_t i_signaled_sends;
ec16227e AG	171
	172	/* rx */
	173	struct mutex i_recv_mutex;
	174	struct rds_ib_work_ring i_recv_ring;
	175	struct rds_ib_incoming *i_ibinc;
	176	u32 i_recv_data_rem;
	177	struct rds_header *i_recv_hdrs;
d43dbacf	178	dma_addr_t i_recv_hdrs_dma;
ec16227e	179	struct rds_ib_recv_work *i_recvs;
ec16227e	180	u64 i_ack_recv; /* last ACK received */
33244125 CM	181	struct rds_ib_refill_cache i_cache_incs;
33244125 CM	182	struct rds_ib_refill_cache i_cache_frags;
09b2b8f5	183	atomic_t i_cache_allocs;
ec16227e AG	184
	185	/* sending acks */
	186	unsigned long i_ack_flags;
8cbd9606 AG	187	#ifdef KERNEL_HAS_ATOMIC64
	188	atomic64_t i_ack_next; /* next ACK to send */
	189	#else
	190	spinlock_t i_ack_lock; /* protect i_ack_next */
ec16227e	191	u64 i_ack_next; /* next ACK to send */
8cbd9606	192	#endif
ec16227e AG	193	struct rds_header *i_ack;
	194	struct ib_send_wr i_ack_wr;
	195	struct ib_sge i_ack_sge;
d43dbacf	196	dma_addr_t i_ack_dma;
ec16227e AG	197	unsigned long i_ack_queued;
	198
	199	/* Flow control related information
	200	*
	201	* Our algorithm uses a pair variables that we need to access
	202	* atomically - one for the send credits, and one posted
	203	* recv credits we need to transfer to remote.
	204	* Rather than protect them using a slow spinlock, we put both into
	205	* a single atomic_t and update it using cmpxchg
	206	*/
	207	atomic_t i_credits;
	208
	209	/* Protocol version specific information */
	210	unsigned int i_flowctl:1; /* enable/disable flow ctl */
	211
	212	/* Batched completions */
	213	unsigned int i_unsignaled_wrs;
581d53c9 SS	214
	215	/* Endpoint role in connection */
	216	bool i_active_side;
cf657269	217	atomic_t i_cq_quiesce;
be2f76ea SS	218
	219	/* Send/Recv vectors */
	220	int i_scq_vector;
	221	int i_rcq_vector;
ec16227e AG	222	};
	223
	224	/* This assumes that atomic_t is at least 32 bits */
	225	#define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
	226	#define IB_GET_POST_CREDITS(v) ((v) >> 16)
	227	#define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
	228	#define IB_SET_POST_CREDITS(v) ((v) << 16)
	229
	230	struct rds_ib_ipaddr {
	231	struct list_head list;
	232	__be32 ipaddr;
59fe4606	233	struct rcu_head rcu;
ec16227e AG	234	};
ec16227e AG	235
06766513 SS	236	enum {
	237	RDS_IB_MR_8K_POOL,
	238	RDS_IB_MR_1M_POOL,
	239	};
	240
ec16227e AG	241	struct rds_ib_device {
	242	struct list_head list;
	243	struct list_head ipaddr_list;
	244	struct list_head conn_list;
	245	struct ib_device *dev;
	246	struct ib_pd *pd;
2cb2912d	247	bool use_fastreg;
2cb2912d	248
f6df683f	249	unsigned int max_mrs;
06766513 SS	250	struct rds_ib_mr_pool *mr_1m_pool;
	251	struct rds_ib_mr_pool *mr_8k_pool;
	252	unsigned int fmr_max_remaps;
f6df683f	253	unsigned int max_8k_mrs;
f6df683f	254	unsigned int max_1m_mrs;
ec16227e AG	255	int max_sge;
ec16227e AG	256	unsigned int max_wrs;
40589e74 AG	257	unsigned int max_initiator_depth;
40589e74 AG	258	unsigned int max_responder_resources;
ec16227e	259	spinlock_t spinlock; /* protect the above */
50d61ff7	260	refcount_t refcount;
3e0249f9	261	struct work_struct free_work;
be2f76ea	262	int *vector_load;
ec16227e AG	263	};
ec16227e AG	264
5f68dcaf	265	#define ibdev_to_node(ibdev) dev_to_node((ibdev)->dev.parent)
e4c52c98 AG	266	#define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
e4c52c98 AG	267
ec16227e AG	268	/* bits for i_ack_flags */
	269	#define IB_ACK_IN_FLIGHT 0
	270	#define IB_ACK_REQUESTED 1
	271
	272	/* Magic WR_ID for ACKs */
	273	#define RDS_IB_ACK_WR_ID (~(u64) 0)
	274
	275	struct rds_ib_statistics {
	276	uint64_t s_ib_connect_raced;
	277	uint64_t s_ib_listen_closed_stale;
f4f943c9 SS	278	uint64_t s_ib_evt_handler_call;
f4f943c9 SS	279	uint64_t s_ib_tasklet_call;
ec16227e AG	280	uint64_t s_ib_tx_cq_event;
	281	uint64_t s_ib_tx_ring_full;
	282	uint64_t s_ib_tx_throttle;
	283	uint64_t s_ib_tx_sg_mapping_failure;
	284	uint64_t s_ib_tx_stalled;
	285	uint64_t s_ib_tx_credit_updates;
ec16227e AG	286	uint64_t s_ib_rx_cq_event;
	287	uint64_t s_ib_rx_ring_empty;
	288	uint64_t s_ib_rx_refill_from_cq;
	289	uint64_t s_ib_rx_refill_from_thread;
	290	uint64_t s_ib_rx_alloc_limit;
09b2b8f5 SS	291	uint64_t s_ib_rx_total_frags;
09b2b8f5 SS	292	uint64_t s_ib_rx_total_incs;
ec16227e AG	293	uint64_t s_ib_rx_credit_updates;
	294	uint64_t s_ib_ack_sent;
	295	uint64_t s_ib_ack_send_failure;
	296	uint64_t s_ib_ack_send_delayed;
	297	uint64_t s_ib_ack_send_piggybacked;
	298	uint64_t s_ib_ack_received;
06766513 SS	299	uint64_t s_ib_rdma_mr_8k_alloc;
	300	uint64_t s_ib_rdma_mr_8k_free;
	301	uint64_t s_ib_rdma_mr_8k_used;
	302	uint64_t s_ib_rdma_mr_8k_pool_flush;
	303	uint64_t s_ib_rdma_mr_8k_pool_wait;
	304	uint64_t s_ib_rdma_mr_8k_pool_depleted;
	305	uint64_t s_ib_rdma_mr_1m_alloc;
	306	uint64_t s_ib_rdma_mr_1m_free;
	307	uint64_t s_ib_rdma_mr_1m_used;
	308	uint64_t s_ib_rdma_mr_1m_pool_flush;
	309	uint64_t s_ib_rdma_mr_1m_pool_wait;
	310	uint64_t s_ib_rdma_mr_1m_pool_depleted;
db42753a	311	uint64_t s_ib_rdma_mr_8k_reused;
db42753a	312	uint64_t s_ib_rdma_mr_1m_reused;
51e2cba8 AG	313	uint64_t s_ib_atomic_cswp;
51e2cba8 AG	314	uint64_t s_ib_atomic_fadd;
09b2b8f5 SS	315	uint64_t s_ib_recv_added_to_cache;
09b2b8f5 SS	316	uint64_t s_ib_recv_removed_from_cache;
ec16227e AG	317	};
	318
	319	extern struct workqueue_struct *rds_ib_wq;
	320
	321	/*
	322	* Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
	323	* doesn't define it.
	324	*/
	325	static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
d2a9ec64 FF	326	struct scatterlist *sglist,
	327	unsigned int sg_dma_len,
	328	int direction)
ec16227e	329	{
d2a9ec64	330	struct scatterlist *sg;
ec16227e AG	331	unsigned int i;
ec16227e AG	332
d2a9ec64	333	for_each_sg(sglist, sg, sg_dma_len, i) {
ec16227e	334	ib_dma_sync_single_for_cpu(dev,
d2a9ec64 FF	335	ib_sg_dma_address(dev, sg),
d2a9ec64 FF	336	ib_sg_dma_len(dev, sg),
ec16227e AG	337	direction);
	338	}
	339	}
	340	#define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu
	341
	342	static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
d2a9ec64 FF	343	struct scatterlist *sglist,
	344	unsigned int sg_dma_len,
	345	int direction)
ec16227e	346	{
d2a9ec64	347	struct scatterlist *sg;
ec16227e AG	348	unsigned int i;
ec16227e AG	349
d2a9ec64	350	for_each_sg(sglist, sg, sg_dma_len, i) {
ec16227e	351	ib_dma_sync_single_for_device(dev,
d2a9ec64 FF	352	ib_sg_dma_address(dev, sg),
d2a9ec64 FF	353	ib_sg_dma_len(dev, sg),
ec16227e AG	354	direction);
	355	}
	356	}
	357	#define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device
	358
	359
	360	/* ib.c */
	361	extern struct rds_transport rds_ib_transport;
3e0249f9 ZB	362	struct rds_ib_device rds_ib_get_client_data(struct ib_device device);
3e0249f9 ZB	363	void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
ec16227e AG	364	extern struct ib_client rds_ib_client;
ec16227e AG	365
3ba23ade	366	extern unsigned int rds_ib_retry_count;
ec16227e AG	367
	368	extern spinlock_t ib_nodev_conns_lock;
	369	extern struct list_head ib_nodev_conns;
	370
	371	/* ib_cm.c */
	372	int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
	373	void rds_ib_conn_free(void *arg);
b04e8554	374	int rds_ib_conn_path_connect(struct rds_conn_path *cp);
226f7a7d	375	void rds_ib_conn_path_shutdown(struct rds_conn_path *cp);
ec16227e	376	void rds_ib_state_change(struct sock *sk);
ef87b7ea	377	int rds_ib_listen_init(void);
ec16227e	378	void rds_ib_listen_stop(void);
6cdaf03f	379	__printf(2, 3)
ec16227e AG	380	void __rds_ib_conn_error(struct rds_connection conn, const char , ...);
ec16227e AG	381	int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
eee2fa6a KCP	382	struct rdma_cm_event *event, bool isv6);
eee2fa6a KCP	383	int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id, bool isv6);
ec16227e AG	384	void rds_ib_cm_connect_complete(struct rds_connection *conn,
	385	struct rdma_cm_event *event);
	386
	387
	388	#define rds_ib_conn_error(conn, fmt...) \
	389	__rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
	390
	391	/* ib_rdma.c */
eee2fa6a KCP	392	int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev,
eee2fa6a KCP	393	struct in6_addr *ipaddr);
745cbcca AG	394	void rds_ib_add_conn(struct rds_ib_device rds_ibdev, struct rds_connection conn);
745cbcca AG	395	void rds_ib_remove_conn(struct rds_ib_device rds_ibdev, struct rds_connection conn);
8aeb1ba6	396	void rds_ib_destroy_nodev_conns(void);
1659185f	397	void rds_ib_mr_cqe_handler(struct rds_ib_connection ic, struct ib_wc wc);
ec16227e AG	398
ec16227e AG	399	/* ib_recv.c */
ef87b7ea	400	int rds_ib_recv_init(void);
ec16227e	401	void rds_ib_recv_exit(void);
2da43c4a	402	int rds_ib_recv_path(struct rds_conn_path *conn);
f394ad28	403	int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic, gfp_t gfp);
33244125	404	void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
73ce4317	405	void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
ec16227e	406	void rds_ib_inc_free(struct rds_incoming *inc);
c310e72c	407	int rds_ib_inc_copy_to_user(struct rds_incoming inc, struct iov_iter to);
f4f943c9 SS	408	void rds_ib_recv_cqe_handler(struct rds_ib_connection ic, struct ib_wc wc,
f4f943c9 SS	409	struct rds_ib_ack_state *state);
d521b63b	410	void rds_ib_recv_tasklet_fn(unsigned long data);
ec16227e AG	411	void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
	412	void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
	413	void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
	414	void rds_ib_attempt_ack(struct rds_ib_connection *ic);
	415	void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
	416	u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
f4f943c9	417	void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
ec16227e AG	418
	419	/* ib_ring.c */
	420	void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
	421	void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
	422	u32 rds_ib_ring_alloc(struct rds_ib_work_ring ring, u32 val, u32 pos);
	423	void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
	424	void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
	425	int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
	426	int rds_ib_ring_low(struct rds_ib_work_ring *ring);
	427	u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
	428	u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
	429	extern wait_queue_head_t rds_ib_ring_empty_wait;
	430
	431	/* ib_send.c */
226f7a7d	432	void rds_ib_xmit_path_complete(struct rds_conn_path *cp);
ec16227e AG	433	int rds_ib_xmit(struct rds_connection conn, struct rds_message rm,
ec16227e AG	434	unsigned int hdr_off, unsigned int sg, unsigned int off);
0c28c045	435	void rds_ib_send_cqe_handler(struct rds_ib_connection ic, struct ib_wc wc);
ec16227e AG	436	void rds_ib_send_init_ring(struct rds_ib_connection *ic);
ec16227e AG	437	void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
f8b3aaf2	438	int rds_ib_xmit_rdma(struct rds_connection conn, struct rm_rdma_op op);
ec16227e AG	439	void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
	440	void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
	441	int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
7b70d033	442	u32 *adv_credits, int need_posted, int max_posted);
ff3d7d36	443	int rds_ib_xmit_atomic(struct rds_connection conn, struct rm_atomic_op op);
ec16227e AG	444
	445	/* ib_stats.c */
	446	DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
	447	#define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
09b2b8f5 SS	448	#define rds_ib_stats_add(member, count) \
09b2b8f5 SS	449	rds_stats_add_which(rds_ib_stats, member, count)
ec16227e AG	450	unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
	451	unsigned int avail);
	452
	453	/* ib_sysctl.c */
ef87b7ea	454	int rds_ib_sysctl_init(void);
ec16227e AG	455	void rds_ib_sysctl_exit(void);
	456	extern unsigned long rds_ib_sysctl_max_send_wr;
	457	extern unsigned long rds_ib_sysctl_max_recv_wr;
	458	extern unsigned long rds_ib_sysctl_max_unsig_wrs;
	459	extern unsigned long rds_ib_sysctl_max_unsig_bytes;
	460	extern unsigned long rds_ib_sysctl_max_recv_allocation;
	461	extern unsigned int rds_ib_sysctl_flow_control;
ec16227e	462
ec16227e	463	#endif