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#ifndef _RDS_IB_H
#define _RDS_IB_H
#include <rdma/ib_verbs.h>
#include <rdma/rdma_cm.h>
#include "rds.h"
#include "rdma_transport.h"
#define RDS_FMR_SIZE 256
#define RDS_FMR_POOL_SIZE 4096
#define RDS_IB_MAX_SGE 8
#define RDS_IB_RECV_SGE 2
#define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
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.
/* page offset of the final full frag that fits in the page */
struct rds_page_frag {
struct list_head f_item;
struct page *f_page;
unsigned long f_offset;
dma_addr_t f_mapped;
struct rds_ib_incoming {
struct list_head ii_frags;
struct rds_incoming ii_inc;
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 {
struct rds_message *s_rm;
struct rds_rdma_op *s_op;
struct ib_send_wr s_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;
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_mr *i_mr;
struct ib_cq *i_send_cq;
struct ib_cq *i_recv_cq;
/* tx */
struct rds_ib_work_ring i_send_ring;
struct rds_message *i_rm;
struct rds_header *i_send_hdrs;
u64 i_send_hdrs_dma;
struct rds_ib_send_work *i_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;
struct rds_page_frag i_frag;
u64 i_ack_recv; /* last ACK received */
/* 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;
long i_unsignaled_bytes;
/* This assumes that atomic_t is at least 32 bits */
#define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
#define IB_GET_POST_CREDITS(v) ((v) >> 16)
#define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
#define IB_SET_POST_CREDITS(v) ((v) << 16)
struct rds_ib_ipaddr {
struct list_head list;
__be32 ipaddr;
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;
struct ib_mr *mr;
struct rds_ib_mr_pool *mr_pool;
unsigned int fmr_max_remaps;
unsigned int max_fmrs;
int max_sge;
unsigned int max_wrs;
spinlock_t spinlock; /* protect the above */
/* 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_tx_cq_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_call;
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_alloc;
uint64_t s_ib_rdma_mr_free;
uint64_t s_ib_rdma_mr_used;
uint64_t s_ib_rdma_mr_pool_flush;
uint64_t s_ib_rdma_mr_pool_wait;
uint64_t s_ib_rdma_mr_pool_depleted;
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 *sg, unsigned int sg_dma_len, int direction)
unsigned int i;
for (i = 0; i < sg_dma_len; ++i) {
ib_sg_dma_address(dev, &sg[i]),
ib_sg_dma_len(dev, &sg[i]),
#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 *sg, unsigned int sg_dma_len, int direction)
unsigned int i;
for (i = 0; i < sg_dma_len; ++i) {
ib_sg_dma_address(dev, &sg[i]),
ib_sg_dma_len(dev, &sg[i]),
#define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device
/* ib.c */
extern struct rds_transport rds_ib_transport;
extern void rds_ib_add_one(struct ib_device *device);
extern void rds_ib_remove_one(struct ib_device *device);
extern struct ib_client rds_ib_client;
extern unsigned int fmr_pool_size;
extern unsigned int fmr_message_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 __init 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_conns(struct list_head *list, spinlock_t *list_lock);
static inline void rds_ib_destroy_nodev_conns(void)
__rds_ib_destroy_conns(&ib_nodev_conns, &ib_nodev_conns_lock);
static inline void rds_ib_destroy_conns(struct rds_ib_device *rds_ibdev)
__rds_ib_destroy_conns(&rds_ibdev->conn_list, &rds_ibdev->spinlock);
struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *);
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);
/* ib_recv.c */
int __init rds_ib_recv_init(void);
void rds_ib_recv_exit(void);
int rds_ib_recv(struct rds_connection *conn);
int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
gfp_t page_gfp, int prefill);
void rds_ib_inc_purge(struct rds_incoming *inc);
void rds_ib_inc_free(struct rds_incoming *inc);
int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
size_t size);
void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
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);
/* 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_cq_comp_handler(struct ib_cq *cq, void *context);
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 rds_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);
/* 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 __init 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;
extern ctl_table rds_ib_sysctl_table[];
* Helper functions for getting/setting the header and data SGEs in
* RDS packets (not RDMA)
* From version 3.1 onwards, header is in front of data in the sge.
static inline struct ib_sge *
rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
if (ic->conn->c_version > RDS_PROTOCOL_3_0)
return &sge[0];
return &sge[1];
static inline struct ib_sge *
rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
if (ic->conn->c_version > RDS_PROTOCOL_3_0)
return &sge[1];
return &sge[0];