1#ifndef _RDS_IW_H 2#define _RDS_IW_H 3 4#include <linux/interrupt.h> 5#include <rdma/ib_verbs.h> 6#include <rdma/rdma_cm.h> 7#include "rds.h" 8#include "rdma_transport.h" 9 10#define RDS_FASTREG_SIZE 20 11#define RDS_FASTREG_POOL_SIZE 2048 12 13#define RDS_IW_MAX_SGE 8 14#define RDS_IW_RECV_SGE 2 15 16#define RDS_IW_DEFAULT_RECV_WR 1024 17#define RDS_IW_DEFAULT_SEND_WR 256 18 19#define RDS_IW_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */ 20 21extern struct list_head rds_iw_devices; 22 23/* 24 * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to 25 * try and minimize the amount of memory tied up both the device and 26 * socket receive queues. 27 */ 28/* page offset of the final full frag that fits in the page */ 29#define RDS_PAGE_LAST_OFF (((PAGE_SIZE / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE) 30struct rds_page_frag { 31 struct list_head f_item; 32 struct page *f_page; 33 unsigned long f_offset; 34 dma_addr_t f_mapped; 35}; 36 37struct rds_iw_incoming { 38 struct list_head ii_frags; 39 struct rds_incoming ii_inc; 40}; 41 42struct rds_iw_connect_private { 43 /* Add new fields at the end, and don't permute existing fields. */ 44 __be32 dp_saddr; 45 __be32 dp_daddr; 46 u8 dp_protocol_major; 47 u8 dp_protocol_minor; 48 __be16 dp_protocol_minor_mask; /* bitmask */ 49 __be32 dp_reserved1; 50 __be64 dp_ack_seq; 51 __be32 dp_credit; /* non-zero enables flow ctl */ 52}; 53 54struct rds_iw_scatterlist { 55 struct scatterlist *list; 56 unsigned int len; 57 int dma_len; 58 unsigned int dma_npages; 59 unsigned int bytes; 60}; 61 62struct rds_iw_mapping { 63 spinlock_t m_lock; /* protect the mapping struct */ 64 struct list_head m_list; 65 struct rds_iw_mr *m_mr; 66 uint32_t m_rkey; 67 struct rds_iw_scatterlist m_sg; 68}; 69 70struct rds_iw_send_work { 71 struct rds_message *s_rm; 72 73 /* We should really put these into a union: */ 74 struct rm_rdma_op *s_op; 75 struct rds_iw_mapping *s_mapping; 76 struct ib_mr *s_mr; 77 struct ib_fast_reg_page_list *s_page_list; 78 unsigned char s_remap_count; 79 80 struct ib_send_wr s_wr; 81 struct ib_sge s_sge[RDS_IW_MAX_SGE]; 82 unsigned long s_queued; 83}; 84 85struct rds_iw_recv_work { 86 struct rds_iw_incoming *r_iwinc; 87 struct rds_page_frag *r_frag; 88 struct ib_recv_wr r_wr; 89 struct ib_sge r_sge[2]; 90}; 91 92struct rds_iw_work_ring { 93 u32 w_nr; 94 u32 w_alloc_ptr; 95 u32 w_alloc_ctr; 96 u32 w_free_ptr; 97 atomic_t w_free_ctr; 98}; 99 100struct rds_iw_device; 101 102struct rds_iw_connection { 103 104 struct list_head iw_node; 105 struct rds_iw_device *rds_iwdev; 106 struct rds_connection *conn; 107 108 /* alphabet soup, IBTA style */ 109 struct rdma_cm_id *i_cm_id; 110 struct ib_pd *i_pd; 111 struct ib_mr *i_mr; 112 struct ib_cq *i_send_cq; 113 struct ib_cq *i_recv_cq; 114 115 /* tx */ 116 struct rds_iw_work_ring i_send_ring; 117 struct rds_message *i_rm; 118 struct rds_header *i_send_hdrs; 119 u64 i_send_hdrs_dma; 120 struct rds_iw_send_work *i_sends; 121 122 /* rx */ 123 struct tasklet_struct i_recv_tasklet; 124 struct mutex i_recv_mutex; 125 struct rds_iw_work_ring i_recv_ring; 126 struct rds_iw_incoming *i_iwinc; 127 u32 i_recv_data_rem; 128 struct rds_header *i_recv_hdrs; 129 u64 i_recv_hdrs_dma; 130 struct rds_iw_recv_work *i_recvs; 131 struct rds_page_frag i_frag; 132 u64 i_ack_recv; /* last ACK received */ 133 134 /* sending acks */ 135 unsigned long i_ack_flags; 136#ifdef KERNEL_HAS_ATOMIC64 137 atomic64_t i_ack_next; /* next ACK to send */ 138#else 139 spinlock_t i_ack_lock; /* protect i_ack_next */ 140 u64 i_ack_next; /* next ACK to send */ 141#endif 142 struct rds_header *i_ack; 143 struct ib_send_wr i_ack_wr; 144 struct ib_sge i_ack_sge; 145 u64 i_ack_dma; 146 unsigned long i_ack_queued; 147 148 /* Flow control related information 149 * 150 * Our algorithm uses a pair variables that we need to access 151 * atomically - one for the send credits, and one posted 152 * recv credits we need to transfer to remote. 153 * Rather than protect them using a slow spinlock, we put both into 154 * a single atomic_t and update it using cmpxchg 155 */ 156 atomic_t i_credits; 157 158 /* Protocol version specific information */ 159 unsigned int i_flowctl:1; /* enable/disable flow ctl */ 160 unsigned int i_dma_local_lkey:1; 161 unsigned int i_fastreg_posted:1; /* fastreg posted on this connection */ 162 /* Batched completions */ 163 unsigned int i_unsignaled_wrs; 164 long i_unsignaled_bytes; 165}; 166 167/* This assumes that atomic_t is at least 32 bits */ 168#define IB_GET_SEND_CREDITS(v) ((v) & 0xffff) 169#define IB_GET_POST_CREDITS(v) ((v) >> 16) 170#define IB_SET_SEND_CREDITS(v) ((v) & 0xffff) 171#define IB_SET_POST_CREDITS(v) ((v) << 16) 172 173struct rds_iw_cm_id { 174 struct list_head list; 175 struct rdma_cm_id *cm_id; 176}; 177 178struct rds_iw_device { 179 struct list_head list; 180 struct list_head cm_id_list; 181 struct list_head conn_list; 182 struct ib_device *dev; 183 struct ib_pd *pd; 184 struct ib_mr *mr; 185 struct rds_iw_mr_pool *mr_pool; 186 int max_sge; 187 unsigned int max_wrs; 188 unsigned int dma_local_lkey:1; 189 spinlock_t spinlock; /* protect the above */ 190}; 191 192/* bits for i_ack_flags */ 193#define IB_ACK_IN_FLIGHT 0 194#define IB_ACK_REQUESTED 1 195 196/* Magic WR_ID for ACKs */ 197#define RDS_IW_ACK_WR_ID ((u64)0xffffffffffffffffULL) 198#define RDS_IW_FAST_REG_WR_ID ((u64)0xefefefefefefefefULL) 199#define RDS_IW_LOCAL_INV_WR_ID ((u64)0xdfdfdfdfdfdfdfdfULL) 200 201struct rds_iw_statistics { 202 uint64_t s_iw_connect_raced; 203 uint64_t s_iw_listen_closed_stale; 204 uint64_t s_iw_tx_cq_call; 205 uint64_t s_iw_tx_cq_event; 206 uint64_t s_iw_tx_ring_full; 207 uint64_t s_iw_tx_throttle; 208 uint64_t s_iw_tx_sg_mapping_failure; 209 uint64_t s_iw_tx_stalled; 210 uint64_t s_iw_tx_credit_updates; 211 uint64_t s_iw_rx_cq_call; 212 uint64_t s_iw_rx_cq_event; 213 uint64_t s_iw_rx_ring_empty; 214 uint64_t s_iw_rx_refill_from_cq; 215 uint64_t s_iw_rx_refill_from_thread; 216 uint64_t s_iw_rx_alloc_limit; 217 uint64_t s_iw_rx_credit_updates; 218 uint64_t s_iw_ack_sent; 219 uint64_t s_iw_ack_send_failure; 220 uint64_t s_iw_ack_send_delayed; 221 uint64_t s_iw_ack_send_piggybacked; 222 uint64_t s_iw_ack_received; 223 uint64_t s_iw_rdma_mr_alloc; 224 uint64_t s_iw_rdma_mr_free; 225 uint64_t s_iw_rdma_mr_used; 226 uint64_t s_iw_rdma_mr_pool_flush; 227 uint64_t s_iw_rdma_mr_pool_wait; 228 uint64_t s_iw_rdma_mr_pool_depleted; 229}; 230 231extern struct workqueue_struct *rds_iw_wq; 232 233/* 234 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h 235 * doesn't define it. 236 */ 237static inline void rds_iw_dma_sync_sg_for_cpu(struct ib_device *dev, 238 struct scatterlist *sg, unsigned int sg_dma_len, int direction) 239{ 240 unsigned int i; 241 242 for (i = 0; i < sg_dma_len; ++i) { 243 ib_dma_sync_single_for_cpu(dev, 244 ib_sg_dma_address(dev, &sg[i]), 245 ib_sg_dma_len(dev, &sg[i]), 246 direction); 247 } 248} 249#define ib_dma_sync_sg_for_cpu rds_iw_dma_sync_sg_for_cpu 250 251static inline void rds_iw_dma_sync_sg_for_device(struct ib_device *dev, 252 struct scatterlist *sg, unsigned int sg_dma_len, int direction) 253{ 254 unsigned int i; 255 256 for (i = 0; i < sg_dma_len; ++i) { 257 ib_dma_sync_single_for_device(dev, 258 ib_sg_dma_address(dev, &sg[i]), 259 ib_sg_dma_len(dev, &sg[i]), 260 direction); 261 } 262} 263#define ib_dma_sync_sg_for_device rds_iw_dma_sync_sg_for_device 264 265static inline u32 rds_iw_local_dma_lkey(struct rds_iw_connection *ic) 266{ 267 return ic->i_dma_local_lkey ? ic->i_cm_id->device->local_dma_lkey : ic->i_mr->lkey; 268} 269 270/* ib.c */ 271extern struct rds_transport rds_iw_transport; 272extern struct ib_client rds_iw_client; 273 274extern unsigned int fastreg_pool_size; 275extern unsigned int fastreg_message_size; 276 277extern spinlock_t iw_nodev_conns_lock; 278extern struct list_head iw_nodev_conns; 279 280/* ib_cm.c */ 281int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp); 282void rds_iw_conn_free(void *arg); 283int rds_iw_conn_connect(struct rds_connection *conn); 284void rds_iw_conn_shutdown(struct rds_connection *conn); 285void rds_iw_state_change(struct sock *sk); 286int rds_iw_listen_init(void); 287void rds_iw_listen_stop(void); 288void __rds_iw_conn_error(struct rds_connection *conn, const char *, ...); 289int rds_iw_cm_handle_connect(struct rdma_cm_id *cm_id, 290 struct rdma_cm_event *event); 291int rds_iw_cm_initiate_connect(struct rdma_cm_id *cm_id); 292void rds_iw_cm_connect_complete(struct rds_connection *conn, 293 struct rdma_cm_event *event); 294 295 296#define rds_iw_conn_error(conn, fmt...) \ 297 __rds_iw_conn_error(conn, KERN_WARNING "RDS/IW: " fmt) 298 299/* ib_rdma.c */ 300int rds_iw_update_cm_id(struct rds_iw_device *rds_iwdev, struct rdma_cm_id *cm_id); 301void rds_iw_add_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn); 302void rds_iw_remove_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn); 303void __rds_iw_destroy_conns(struct list_head *list, spinlock_t *list_lock); 304static inline void rds_iw_destroy_nodev_conns(void) 305{ 306 __rds_iw_destroy_conns(&iw_nodev_conns, &iw_nodev_conns_lock); 307} 308static inline void rds_iw_destroy_conns(struct rds_iw_device *rds_iwdev) 309{ 310 __rds_iw_destroy_conns(&rds_iwdev->conn_list, &rds_iwdev->spinlock); 311} 312struct rds_iw_mr_pool *rds_iw_create_mr_pool(struct rds_iw_device *); 313void rds_iw_get_mr_info(struct rds_iw_device *rds_iwdev, struct rds_info_rdma_connection *iinfo); 314void rds_iw_destroy_mr_pool(struct rds_iw_mr_pool *); 315void *rds_iw_get_mr(struct scatterlist *sg, unsigned long nents, 316 struct rds_sock *rs, u32 *key_ret); 317void rds_iw_sync_mr(void *trans_private, int dir); 318void rds_iw_free_mr(void *trans_private, int invalidate); 319void rds_iw_flush_mrs(void); 320 321/* ib_recv.c */ 322int rds_iw_recv_init(void); 323void rds_iw_recv_exit(void); 324int rds_iw_recv(struct rds_connection *conn); 325int rds_iw_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp, 326 gfp_t page_gfp, int prefill); 327void rds_iw_inc_free(struct rds_incoming *inc); 328int rds_iw_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); 329void rds_iw_recv_cq_comp_handler(struct ib_cq *cq, void *context); 330void rds_iw_recv_tasklet_fn(unsigned long data); 331void rds_iw_recv_init_ring(struct rds_iw_connection *ic); 332void rds_iw_recv_clear_ring(struct rds_iw_connection *ic); 333void rds_iw_recv_init_ack(struct rds_iw_connection *ic); 334void rds_iw_attempt_ack(struct rds_iw_connection *ic); 335void rds_iw_ack_send_complete(struct rds_iw_connection *ic); 336u64 rds_iw_piggyb_ack(struct rds_iw_connection *ic); 337 338/* ib_ring.c */ 339void rds_iw_ring_init(struct rds_iw_work_ring *ring, u32 nr); 340void rds_iw_ring_resize(struct rds_iw_work_ring *ring, u32 nr); 341u32 rds_iw_ring_alloc(struct rds_iw_work_ring *ring, u32 val, u32 *pos); 342void rds_iw_ring_free(struct rds_iw_work_ring *ring, u32 val); 343void rds_iw_ring_unalloc(struct rds_iw_work_ring *ring, u32 val); 344int rds_iw_ring_empty(struct rds_iw_work_ring *ring); 345int rds_iw_ring_low(struct rds_iw_work_ring *ring); 346u32 rds_iw_ring_oldest(struct rds_iw_work_ring *ring); 347u32 rds_iw_ring_completed(struct rds_iw_work_ring *ring, u32 wr_id, u32 oldest); 348extern wait_queue_head_t rds_iw_ring_empty_wait; 349 350/* ib_send.c */ 351void rds_iw_xmit_complete(struct rds_connection *conn); 352int rds_iw_xmit(struct rds_connection *conn, struct rds_message *rm, 353 unsigned int hdr_off, unsigned int sg, unsigned int off); 354void rds_iw_send_cq_comp_handler(struct ib_cq *cq, void *context); 355void rds_iw_send_init_ring(struct rds_iw_connection *ic); 356void rds_iw_send_clear_ring(struct rds_iw_connection *ic); 357int rds_iw_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op); 358void rds_iw_send_add_credits(struct rds_connection *conn, unsigned int credits); 359void rds_iw_advertise_credits(struct rds_connection *conn, unsigned int posted); 360int rds_iw_send_grab_credits(struct rds_iw_connection *ic, u32 wanted, 361 u32 *adv_credits, int need_posted, int max_posted); 362 363/* ib_stats.c */ 364DECLARE_PER_CPU(struct rds_iw_statistics, rds_iw_stats); 365#define rds_iw_stats_inc(member) rds_stats_inc_which(rds_iw_stats, member) 366unsigned int rds_iw_stats_info_copy(struct rds_info_iterator *iter, 367 unsigned int avail); 368 369/* ib_sysctl.c */ 370int rds_iw_sysctl_init(void); 371void rds_iw_sysctl_exit(void); 372extern unsigned long rds_iw_sysctl_max_send_wr; 373extern unsigned long rds_iw_sysctl_max_recv_wr; 374extern unsigned long rds_iw_sysctl_max_unsig_wrs; 375extern unsigned long rds_iw_sysctl_max_unsig_bytes; 376extern unsigned long rds_iw_sysctl_max_recv_allocation; 377extern unsigned int rds_iw_sysctl_flow_control; 378 379/* 380 * Helper functions for getting/setting the header and data SGEs in 381 * RDS packets (not RDMA) 382 */ 383static inline struct ib_sge * 384rds_iw_header_sge(struct rds_iw_connection *ic, struct ib_sge *sge) 385{ 386 return &sge[0]; 387} 388 389static inline struct ib_sge * 390rds_iw_data_sge(struct rds_iw_connection *ic, struct ib_sge *sge) 391{ 392 return &sge[1]; 393} 394 395#endif 396