net/rds/ib.h - third_party/linux - Git at Google


            
            /* 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		512


            #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 */

            
            	u8			ricpc_dp_toss;

            
            	u8			ripc_reserved1;

            
            	__be16			ripc_reserved2;

            
            	__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_fastreg_inuse_count;


            	/* 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;

            
            	u8			i_sl;

            
            };


            /* 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;

            
            	u8			odp_capable:1;


            	unsigned int		max_mrs;

            
            	struct rds_ib_mr_pool	*mr_1m_pool;

            
            	struct rds_ib_mr_pool   *mr_8k_pool;

            
            	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 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, sg_dma_address(sg),

            
            					   sg_dma_len(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, sg_dma_address(sg),

            
            					      sg_dma_len(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);

            
            __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 */

            
            struct rds_ib_device *rds_ib_get_device(__be32 ipaddr);

            
            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_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_SHARED_ALIGNED(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
	/* 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 512

	#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 */
	u8 ricpc_dp_toss;
	u8 ripc_reserved1;
	__be16 ripc_reserved2;
	__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_fastreg_inuse_count;

	/* 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;
	u8 i_sl;
	};

	/* 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;
	u8 odp_capable:1;

	unsigned int max_mrs;
	struct rds_ib_mr_pool *mr_1m_pool;
	struct rds_ib_mr_pool *mr_8k_pool;
	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 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, sg_dma_address(sg),
	sg_dma_len(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, sg_dma_address(sg),
	sg_dma_len(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);
	__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 */
	struct rds_ib_device *rds_ib_get_device(__be32 ipaddr);
	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_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_SHARED_ALIGNED(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