#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_DEFAULT_RECV_WR 1024 #define RDS_IB_DEFAULT_SEND_WR 256 #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 */ #define RDS_PAGE_LAST_OFF (((PAGE_SIZE / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE) 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; #ifdef KERNEL_HAS_ATOMIC64 atomic64_t i_ack_next; /* next ACK to send */ #else spinlock_t i_ack_lock; /* protect i_ack_next */ u64 i_ack_next; /* next ACK to send */ #endif struct rds_header *i_ack; struct ib_send_wr i_ack_wr; struct ib_sge i_ack_sge; u64 i_ack_dma; unsigned long i_ack_queued; /* Flow control related information * * Our algorithm uses a pair variables that we need to access * atomically - one for the send credits, and one posted * recv credits we need to transfer to remote. * Rather than protect them using a slow spinlock, we put both into * a single atomic_t and update it using cmpxchg */ atomic_t i_credits; /* Protocol version specific information */ unsigned int i_flowctl:1; /* enable/disable flow ctl */ /* Batched completions */ unsigned int i_unsignaled_wrs; 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; int fmr_page_shift; int fmr_page_size; u64 fmr_page_mask; 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 #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_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_dma_sync_single_for_cpu(dev, ib_sg_dma_address(dev, &sg[i]), ib_sg_dma_len(dev, &sg[i]), 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 *sg, unsigned int sg_dma_len, int direction) { unsigned int i; for (i = 0; i < sg_dma_len; ++i) { ib_dma_sync_single_for_device(dev, ib_sg_dma_address(dev, &sg[i]), ib_sg_dma_len(dev, &sg[i]), direction); } } #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 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); /* 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) */ static inline struct ib_sge * rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge) { return &sge[0]; } static inline struct ib_sge * rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge) { return &sge[1]; } #endif