cregit-Linux how code gets into the kernel

Release 4.8 net/rds/ib.h

Directory: net/rds
#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_FR_WR		512


#define RDS_IB_SUPPORTED_PROTOCOLS	0x00000003	
/* minor versions supported */


#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];

	/* To control the number of wrs from fastreg */
atomic_t		i_fastreg_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;
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;
atomic64_t		i_ack_next;	/* next ACK to send */
spinlock_t		i_ack_lock;	/* protect i_ack_next */
u64			i_ack_next;	/* next ACK to send */
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 {

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                    has_fmr;
bool                    has_fr;
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 */
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


/* 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_rdma_mr_8k_reused;
uint64_t	s_ib_rdma_mr_1m_reused;
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); } }


andy groverandy grover5075.76%150.00%
fabian frederickfabian frederick1624.24%150.00%

#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); } }


andy groverandy grover5075.76%150.00%
fabian frederickfabian frederick1624.24%150.00%

#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); 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); 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); 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) 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

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