| #ifndef _RDS_IW_H |
| #define _RDS_IW_H |
| |
| #include <rdma/ib_verbs.h> |
| #include <rdma/rdma_cm.h> |
| #include "rds.h" |
| #include "rdma_transport.h" |
| |
| #define RDS_FASTREG_SIZE 20 |
| #define RDS_FASTREG_POOL_SIZE 2048 |
| |
| #define RDS_IW_MAX_SGE 8 |
| #define RDS_IW_RECV_SGE 2 |
| |
| #define RDS_IW_DEFAULT_RECV_WR 1024 |
| #define RDS_IW_DEFAULT_SEND_WR 256 |
| |
| #define RDS_IW_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */ |
| |
| extern struct list_head rds_iw_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_iw_incoming { |
| struct list_head ii_frags; |
| struct rds_incoming ii_inc; |
| }; |
| |
| struct rds_iw_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_iw_scatterlist { |
| struct scatterlist *list; |
| unsigned int len; |
| int dma_len; |
| unsigned int dma_npages; |
| unsigned int bytes; |
| }; |
| |
| struct rds_iw_mapping { |
| spinlock_t m_lock; /* protect the mapping struct */ |
| struct list_head m_list; |
| struct rds_iw_mr *m_mr; |
| uint32_t m_rkey; |
| struct rds_iw_scatterlist m_sg; |
| }; |
| |
| struct rds_iw_send_work { |
| struct rds_message *s_rm; |
| |
| /* We should really put these into a union: */ |
| struct rds_rdma_op *s_op; |
| struct rds_iw_mapping *s_mapping; |
| struct ib_mr *s_mr; |
| struct ib_fast_reg_page_list *s_page_list; |
| unsigned char s_remap_count; |
| |
| struct ib_send_wr s_wr; |
| struct ib_sge s_sge[RDS_IW_MAX_SGE]; |
| unsigned long s_queued; |
| }; |
| |
| struct rds_iw_recv_work { |
| struct rds_iw_incoming *r_iwinc; |
| struct rds_page_frag *r_frag; |
| struct ib_recv_wr r_wr; |
| struct ib_sge r_sge[2]; |
| }; |
| |
| struct rds_iw_work_ring { |
| u32 w_nr; |
| u32 w_alloc_ptr; |
| u32 w_alloc_ctr; |
| u32 w_free_ptr; |
| atomic_t w_free_ctr; |
| }; |
| |
| struct rds_iw_device; |
| |
| struct rds_iw_connection { |
| |
| struct list_head iw_node; |
| struct rds_iw_device *rds_iwdev; |
| 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_iw_work_ring i_send_ring; |
| struct rds_message *i_rm; |
| struct rds_header *i_send_hdrs; |
| u64 i_send_hdrs_dma; |
| struct rds_iw_send_work *i_sends; |
| |
| /* rx */ |
| struct mutex i_recv_mutex; |
| struct rds_iw_work_ring i_recv_ring; |
| struct rds_iw_incoming *i_iwinc; |
| u32 i_recv_data_rem; |
| struct rds_header *i_recv_hdrs; |
| u64 i_recv_hdrs_dma; |
| struct rds_iw_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 */ |
| unsigned int i_dma_local_lkey:1; |
| unsigned int i_fastreg_posted:1; /* fastreg posted on this connection */ |
| /* 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_iw_cm_id { |
| struct list_head list; |
| struct rdma_cm_id *cm_id; |
| }; |
| |
| struct rds_iw_device { |
| struct list_head list; |
| struct list_head cm_id_list; |
| struct list_head conn_list; |
| struct ib_device *dev; |
| struct ib_pd *pd; |
| struct ib_mr *mr; |
| struct rds_iw_mr_pool *mr_pool; |
| int max_sge; |
| unsigned int max_wrs; |
| unsigned int dma_local_lkey:1; |
| 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_IW_ACK_WR_ID ((u64)0xffffffffffffffffULL) |
| #define RDS_IW_FAST_REG_WR_ID ((u64)0xefefefefefefefefULL) |
| #define RDS_IW_LOCAL_INV_WR_ID ((u64)0xdfdfdfdfdfdfdfdfULL) |
| |
| struct rds_iw_statistics { |
| uint64_t s_iw_connect_raced; |
| uint64_t s_iw_listen_closed_stale; |
| uint64_t s_iw_tx_cq_call; |
| uint64_t s_iw_tx_cq_event; |
| uint64_t s_iw_tx_ring_full; |
| uint64_t s_iw_tx_throttle; |
| uint64_t s_iw_tx_sg_mapping_failure; |
| uint64_t s_iw_tx_stalled; |
| uint64_t s_iw_tx_credit_updates; |
| uint64_t s_iw_rx_cq_call; |
| uint64_t s_iw_rx_cq_event; |
| uint64_t s_iw_rx_ring_empty; |
| uint64_t s_iw_rx_refill_from_cq; |
| uint64_t s_iw_rx_refill_from_thread; |
| uint64_t s_iw_rx_alloc_limit; |
| uint64_t s_iw_rx_credit_updates; |
| uint64_t s_iw_ack_sent; |
| uint64_t s_iw_ack_send_failure; |
| uint64_t s_iw_ack_send_delayed; |
| uint64_t s_iw_ack_send_piggybacked; |
| uint64_t s_iw_ack_received; |
| uint64_t s_iw_rdma_mr_alloc; |
| uint64_t s_iw_rdma_mr_free; |
| uint64_t s_iw_rdma_mr_used; |
| uint64_t s_iw_rdma_mr_pool_flush; |
| uint64_t s_iw_rdma_mr_pool_wait; |
| uint64_t s_iw_rdma_mr_pool_depleted; |
| }; |
| |
| extern struct workqueue_struct *rds_iw_wq; |
| |
| /* |
| * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h |
| * doesn't define it. |
| */ |
| static inline void rds_iw_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_iw_dma_sync_sg_for_cpu |
| |
| static inline void rds_iw_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_iw_dma_sync_sg_for_device |
| |
| static inline u32 rds_iw_local_dma_lkey(struct rds_iw_connection *ic) |
| { |
| return ic->i_dma_local_lkey ? ic->i_cm_id->device->local_dma_lkey : ic->i_mr->lkey; |
| } |
| |
| /* ib.c */ |
| extern struct rds_transport rds_iw_transport; |
| extern void rds_iw_add_one(struct ib_device *device); |
| extern void rds_iw_remove_one(struct ib_device *device); |
| extern struct ib_client rds_iw_client; |
| |
| extern unsigned int fastreg_pool_size; |
| extern unsigned int fastreg_message_size; |
| |
| extern spinlock_t iw_nodev_conns_lock; |
| extern struct list_head iw_nodev_conns; |
| |
| /* ib_cm.c */ |
| int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp); |
| void rds_iw_conn_free(void *arg); |
| int rds_iw_conn_connect(struct rds_connection *conn); |
| void rds_iw_conn_shutdown(struct rds_connection *conn); |
| void rds_iw_state_change(struct sock *sk); |
| int __init rds_iw_listen_init(void); |
| void rds_iw_listen_stop(void); |
| void __rds_iw_conn_error(struct rds_connection *conn, const char *, ...); |
| int rds_iw_cm_handle_connect(struct rdma_cm_id *cm_id, |
| struct rdma_cm_event *event); |
| int rds_iw_cm_initiate_connect(struct rdma_cm_id *cm_id); |
| void rds_iw_cm_connect_complete(struct rds_connection *conn, |
| struct rdma_cm_event *event); |
| |
| |
| #define rds_iw_conn_error(conn, fmt...) \ |
| __rds_iw_conn_error(conn, KERN_WARNING "RDS/IW: " fmt) |
| |
| /* ib_rdma.c */ |
| int rds_iw_update_cm_id(struct rds_iw_device *rds_iwdev, struct rdma_cm_id *cm_id); |
| void rds_iw_add_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn); |
| void rds_iw_remove_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn); |
| void __rds_iw_destroy_conns(struct list_head *list, spinlock_t *list_lock); |
| static inline void rds_iw_destroy_nodev_conns(void) |
| { |
| __rds_iw_destroy_conns(&iw_nodev_conns, &iw_nodev_conns_lock); |
| } |
| static inline void rds_iw_destroy_conns(struct rds_iw_device *rds_iwdev) |
| { |
| __rds_iw_destroy_conns(&rds_iwdev->conn_list, &rds_iwdev->spinlock); |
| } |
| struct rds_iw_mr_pool *rds_iw_create_mr_pool(struct rds_iw_device *); |
| void rds_iw_get_mr_info(struct rds_iw_device *rds_iwdev, struct rds_info_rdma_connection *iinfo); |
| void rds_iw_destroy_mr_pool(struct rds_iw_mr_pool *); |
| void *rds_iw_get_mr(struct scatterlist *sg, unsigned long nents, |
| struct rds_sock *rs, u32 *key_ret); |
| void rds_iw_sync_mr(void *trans_private, int dir); |
| void rds_iw_free_mr(void *trans_private, int invalidate); |
| void rds_iw_flush_mrs(void); |
| void rds_iw_remove_cm_id(struct rds_iw_device *rds_iwdev, struct rdma_cm_id *cm_id); |
| |
| /* ib_recv.c */ |
| int __init rds_iw_recv_init(void); |
| void rds_iw_recv_exit(void); |
| int rds_iw_recv(struct rds_connection *conn); |
| int rds_iw_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp, |
| gfp_t page_gfp, int prefill); |
| void rds_iw_inc_purge(struct rds_incoming *inc); |
| void rds_iw_inc_free(struct rds_incoming *inc); |
| int rds_iw_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov, |
| size_t size); |
| void rds_iw_recv_cq_comp_handler(struct ib_cq *cq, void *context); |
| void rds_iw_recv_init_ring(struct rds_iw_connection *ic); |
| void rds_iw_recv_clear_ring(struct rds_iw_connection *ic); |
| void rds_iw_recv_init_ack(struct rds_iw_connection *ic); |
| void rds_iw_attempt_ack(struct rds_iw_connection *ic); |
| void rds_iw_ack_send_complete(struct rds_iw_connection *ic); |
| u64 rds_iw_piggyb_ack(struct rds_iw_connection *ic); |
| |
| /* ib_ring.c */ |
| void rds_iw_ring_init(struct rds_iw_work_ring *ring, u32 nr); |
| void rds_iw_ring_resize(struct rds_iw_work_ring *ring, u32 nr); |
| u32 rds_iw_ring_alloc(struct rds_iw_work_ring *ring, u32 val, u32 *pos); |
| void rds_iw_ring_free(struct rds_iw_work_ring *ring, u32 val); |
| void rds_iw_ring_unalloc(struct rds_iw_work_ring *ring, u32 val); |
| int rds_iw_ring_empty(struct rds_iw_work_ring *ring); |
| int rds_iw_ring_low(struct rds_iw_work_ring *ring); |
| u32 rds_iw_ring_oldest(struct rds_iw_work_ring *ring); |
| u32 rds_iw_ring_completed(struct rds_iw_work_ring *ring, u32 wr_id, u32 oldest); |
| extern wait_queue_head_t rds_iw_ring_empty_wait; |
| |
| /* ib_send.c */ |
| void rds_iw_xmit_complete(struct rds_connection *conn); |
| int rds_iw_xmit(struct rds_connection *conn, struct rds_message *rm, |
| unsigned int hdr_off, unsigned int sg, unsigned int off); |
| void rds_iw_send_cq_comp_handler(struct ib_cq *cq, void *context); |
| void rds_iw_send_init_ring(struct rds_iw_connection *ic); |
| void rds_iw_send_clear_ring(struct rds_iw_connection *ic); |
| int rds_iw_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op); |
| void rds_iw_send_add_credits(struct rds_connection *conn, unsigned int credits); |
| void rds_iw_advertise_credits(struct rds_connection *conn, unsigned int posted); |
| int rds_iw_send_grab_credits(struct rds_iw_connection *ic, u32 wanted, |
| u32 *adv_credits, int need_posted, int max_posted); |
| |
| /* ib_stats.c */ |
| DECLARE_PER_CPU(struct rds_iw_statistics, rds_iw_stats); |
| #define rds_iw_stats_inc(member) rds_stats_inc_which(rds_iw_stats, member) |
| unsigned int rds_iw_stats_info_copy(struct rds_info_iterator *iter, |
| unsigned int avail); |
| |
| /* ib_sysctl.c */ |
| int __init rds_iw_sysctl_init(void); |
| void rds_iw_sysctl_exit(void); |
| extern unsigned long rds_iw_sysctl_max_send_wr; |
| extern unsigned long rds_iw_sysctl_max_recv_wr; |
| extern unsigned long rds_iw_sysctl_max_unsig_wrs; |
| extern unsigned long rds_iw_sysctl_max_unsig_bytes; |
| extern unsigned long rds_iw_sysctl_max_recv_allocation; |
| extern unsigned int rds_iw_sysctl_flow_control; |
| extern ctl_table rds_iw_sysctl_table[]; |
| |
| /* |
| * Helper functions for getting/setting the header and data SGEs in |
| * RDS packets (not RDMA) |
| */ |
| static inline struct ib_sge * |
| rds_iw_header_sge(struct rds_iw_connection *ic, struct ib_sge *sge) |
| { |
| return &sge[0]; |
| } |
| |
| static inline struct ib_sge * |
| rds_iw_data_sge(struct rds_iw_connection *ic, struct ib_sge *sge) |
| { |
| return &sge[1]; |
| } |
| |
| #endif |