1 #ifndef _RDS_IB_H 2 #define _RDS_IB_H 3 4 #include <rdma/ib_verbs.h> 5 #include <rdma/rdma_cm.h> 6 #include "rds.h" 7 #include "rdma_transport.h" 8 9 #define RDS_FMR_SIZE 256 10 #define RDS_FMR_POOL_SIZE 4096 11 12 #define RDS_IB_MAX_SGE 8 13 #define RDS_IB_RECV_SGE 2 14 15 #define RDS_IB_DEFAULT_RECV_WR 1024 16 #define RDS_IB_DEFAULT_SEND_WR 256 17 18 #define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */ 19 20 extern struct list_head rds_ib_devices; 21 22 /* 23 * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to 24 * try and minimize the amount of memory tied up both the device and 25 * socket receive queues. 26 */ 27 /* page offset of the final full frag that fits in the page */ 28 #define RDS_PAGE_LAST_OFF (((PAGE_SIZE / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE) 29 struct rds_page_frag { 30 struct list_head f_item; 31 struct page *f_page; 32 unsigned long f_offset; 33 dma_addr_t f_mapped; 34 }; 35 36 struct rds_ib_incoming { 37 struct list_head ii_frags; 38 struct rds_incoming ii_inc; 39 }; 40 41 struct rds_ib_connect_private { 42 /* Add new fields at the end, and don't permute existing fields. */ 43 __be32 dp_saddr; 44 __be32 dp_daddr; 45 u8 dp_protocol_major; 46 u8 dp_protocol_minor; 47 __be16 dp_protocol_minor_mask; /* bitmask */ 48 __be32 dp_reserved1; 49 __be64 dp_ack_seq; 50 __be32 dp_credit; /* non-zero enables flow ctl */ 51 }; 52 53 struct rds_ib_send_work { 54 struct rds_message *s_rm; 55 struct rds_rdma_op *s_op; 56 struct ib_send_wr s_wr; 57 struct ib_sge s_sge[RDS_IB_MAX_SGE]; 58 unsigned long s_queued; 59 }; 60 61 struct rds_ib_recv_work { 62 struct rds_ib_incoming *r_ibinc; 63 struct rds_page_frag *r_frag; 64 struct ib_recv_wr r_wr; 65 struct ib_sge r_sge[2]; 66 }; 67 68 struct rds_ib_work_ring { 69 u32 w_nr; 70 u32 w_alloc_ptr; 71 u32 w_alloc_ctr; 72 u32 w_free_ptr; 73 atomic_t w_free_ctr; 74 }; 75 76 struct rds_ib_device; 77 78 struct rds_ib_connection { 79 80 struct list_head ib_node; 81 struct rds_ib_device *rds_ibdev; 82 struct rds_connection *conn; 83 84 /* alphabet soup, IBTA style */ 85 struct rdma_cm_id *i_cm_id; 86 struct ib_pd *i_pd; 87 struct ib_mr *i_mr; 88 struct ib_cq *i_send_cq; 89 struct ib_cq *i_recv_cq; 90 91 /* tx */ 92 struct rds_ib_work_ring i_send_ring; 93 struct rds_message *i_rm; 94 struct rds_header *i_send_hdrs; 95 u64 i_send_hdrs_dma; 96 struct rds_ib_send_work *i_sends; 97 98 /* rx */ 99 struct mutex i_recv_mutex; 100 struct rds_ib_work_ring i_recv_ring; 101 struct rds_ib_incoming *i_ibinc; 102 u32 i_recv_data_rem; 103 struct rds_header *i_recv_hdrs; 104 u64 i_recv_hdrs_dma; 105 struct rds_ib_recv_work *i_recvs; 106 struct rds_page_frag i_frag; 107 u64 i_ack_recv; /* last ACK received */ 108 109 /* sending acks */ 110 unsigned long i_ack_flags; 111 #ifdef KERNEL_HAS_ATOMIC64 112 atomic64_t i_ack_next; /* next ACK to send */ 113 #else 114 spinlock_t i_ack_lock; /* protect i_ack_next */ 115 u64 i_ack_next; /* next ACK to send */ 116 #endif 117 struct rds_header *i_ack; 118 struct ib_send_wr i_ack_wr; 119 struct ib_sge i_ack_sge; 120 u64 i_ack_dma; 121 unsigned long i_ack_queued; 122 123 /* Flow control related information 124 * 125 * Our algorithm uses a pair variables that we need to access 126 * atomically - one for the send credits, and one posted 127 * recv credits we need to transfer to remote. 128 * Rather than protect them using a slow spinlock, we put both into 129 * a single atomic_t and update it using cmpxchg 130 */ 131 atomic_t i_credits; 132 133 /* Protocol version specific information */ 134 unsigned int i_flowctl:1; /* enable/disable flow ctl */ 135 136 /* Batched completions */ 137 unsigned int i_unsignaled_wrs; 138 long i_unsignaled_bytes; 139 }; 140 141 /* This assumes that atomic_t is at least 32 bits */ 142 #define IB_GET_SEND_CREDITS(v) ((v) & 0xffff) 143 #define IB_GET_POST_CREDITS(v) ((v) >> 16) 144 #define IB_SET_SEND_CREDITS(v) ((v) & 0xffff) 145 #define IB_SET_POST_CREDITS(v) ((v) << 16) 146 147 struct rds_ib_ipaddr { 148 struct list_head list; 149 __be32 ipaddr; 150 }; 151 152 struct rds_ib_device { 153 struct list_head list; 154 struct list_head ipaddr_list; 155 struct list_head conn_list; 156 struct ib_device *dev; 157 struct ib_pd *pd; 158 struct ib_mr *mr; 159 struct rds_ib_mr_pool *mr_pool; 160 int fmr_page_shift; 161 int fmr_page_size; 162 u64 fmr_page_mask; 163 unsigned int fmr_max_remaps; 164 unsigned int max_fmrs; 165 int max_sge; 166 unsigned int max_wrs; 167 spinlock_t spinlock; /* protect the above */ 168 }; 169 170 /* bits for i_ack_flags */ 171 #define IB_ACK_IN_FLIGHT 0 172 #define IB_ACK_REQUESTED 1 173 174 /* Magic WR_ID for ACKs */ 175 #define RDS_IB_ACK_WR_ID (~(u64) 0) 176 177 struct rds_ib_statistics { 178 uint64_t s_ib_connect_raced; 179 uint64_t s_ib_listen_closed_stale; 180 uint64_t s_ib_tx_cq_call; 181 uint64_t s_ib_tx_cq_event; 182 uint64_t s_ib_tx_ring_full; 183 uint64_t s_ib_tx_throttle; 184 uint64_t s_ib_tx_sg_mapping_failure; 185 uint64_t s_ib_tx_stalled; 186 uint64_t s_ib_tx_credit_updates; 187 uint64_t s_ib_rx_cq_call; 188 uint64_t s_ib_rx_cq_event; 189 uint64_t s_ib_rx_ring_empty; 190 uint64_t s_ib_rx_refill_from_cq; 191 uint64_t s_ib_rx_refill_from_thread; 192 uint64_t s_ib_rx_alloc_limit; 193 uint64_t s_ib_rx_credit_updates; 194 uint64_t s_ib_ack_sent; 195 uint64_t s_ib_ack_send_failure; 196 uint64_t s_ib_ack_send_delayed; 197 uint64_t s_ib_ack_send_piggybacked; 198 uint64_t s_ib_ack_received; 199 uint64_t s_ib_rdma_mr_alloc; 200 uint64_t s_ib_rdma_mr_free; 201 uint64_t s_ib_rdma_mr_used; 202 uint64_t s_ib_rdma_mr_pool_flush; 203 uint64_t s_ib_rdma_mr_pool_wait; 204 uint64_t s_ib_rdma_mr_pool_depleted; 205 }; 206 207 extern struct workqueue_struct *rds_ib_wq; 208 209 /* 210 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h 211 * doesn't define it. 212 */ 213 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev, 214 struct scatterlist *sg, unsigned int sg_dma_len, int direction) 215 { 216 unsigned int i; 217 218 for (i = 0; i < sg_dma_len; ++i) { 219 ib_dma_sync_single_for_cpu(dev, 220 ib_sg_dma_address(dev, &sg[i]), 221 ib_sg_dma_len(dev, &sg[i]), 222 direction); 223 } 224 } 225 #define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu 226 227 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev, 228 struct scatterlist *sg, unsigned int sg_dma_len, int direction) 229 { 230 unsigned int i; 231 232 for (i = 0; i < sg_dma_len; ++i) { 233 ib_dma_sync_single_for_device(dev, 234 ib_sg_dma_address(dev, &sg[i]), 235 ib_sg_dma_len(dev, &sg[i]), 236 direction); 237 } 238 } 239 #define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device 240 241 242 /* ib.c */ 243 extern struct rds_transport rds_ib_transport; 244 extern void rds_ib_add_one(struct ib_device *device); 245 extern void rds_ib_remove_one(struct ib_device *device); 246 extern struct ib_client rds_ib_client; 247 248 extern unsigned int fmr_pool_size; 249 extern unsigned int fmr_message_size; 250 251 extern spinlock_t ib_nodev_conns_lock; 252 extern struct list_head ib_nodev_conns; 253 254 /* ib_cm.c */ 255 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp); 256 void rds_ib_conn_free(void *arg); 257 int rds_ib_conn_connect(struct rds_connection *conn); 258 void rds_ib_conn_shutdown(struct rds_connection *conn); 259 void rds_ib_state_change(struct sock *sk); 260 int __init rds_ib_listen_init(void); 261 void rds_ib_listen_stop(void); 262 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...); 263 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, 264 struct rdma_cm_event *event); 265 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id); 266 void rds_ib_cm_connect_complete(struct rds_connection *conn, 267 struct rdma_cm_event *event); 268 269 270 #define rds_ib_conn_error(conn, fmt...) \ 271 __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt) 272 273 /* ib_rdma.c */ 274 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr); 275 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); 276 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); 277 void __rds_ib_destroy_conns(struct list_head *list, spinlock_t *list_lock); 278 static inline void rds_ib_destroy_nodev_conns(void) 279 { 280 __rds_ib_destroy_conns(&ib_nodev_conns, &ib_nodev_conns_lock); 281 } 282 static inline void rds_ib_destroy_conns(struct rds_ib_device *rds_ibdev) 283 { 284 __rds_ib_destroy_conns(&rds_ibdev->conn_list, &rds_ibdev->spinlock); 285 } 286 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *); 287 void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo); 288 void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *); 289 void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents, 290 struct rds_sock *rs, u32 *key_ret); 291 void rds_ib_sync_mr(void *trans_private, int dir); 292 void rds_ib_free_mr(void *trans_private, int invalidate); 293 void rds_ib_flush_mrs(void); 294 295 /* ib_recv.c */ 296 int __init rds_ib_recv_init(void); 297 void rds_ib_recv_exit(void); 298 int rds_ib_recv(struct rds_connection *conn); 299 int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp, 300 gfp_t page_gfp, int prefill); 301 void rds_ib_inc_purge(struct rds_incoming *inc); 302 void rds_ib_inc_free(struct rds_incoming *inc); 303 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov, 304 size_t size); 305 void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context); 306 void rds_ib_recv_init_ring(struct rds_ib_connection *ic); 307 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic); 308 void rds_ib_recv_init_ack(struct rds_ib_connection *ic); 309 void rds_ib_attempt_ack(struct rds_ib_connection *ic); 310 void rds_ib_ack_send_complete(struct rds_ib_connection *ic); 311 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic); 312 313 /* ib_ring.c */ 314 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr); 315 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr); 316 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos); 317 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val); 318 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val); 319 int rds_ib_ring_empty(struct rds_ib_work_ring *ring); 320 int rds_ib_ring_low(struct rds_ib_work_ring *ring); 321 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring); 322 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest); 323 extern wait_queue_head_t rds_ib_ring_empty_wait; 324 325 /* ib_send.c */ 326 void rds_ib_xmit_complete(struct rds_connection *conn); 327 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm, 328 unsigned int hdr_off, unsigned int sg, unsigned int off); 329 void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context); 330 void rds_ib_send_init_ring(struct rds_ib_connection *ic); 331 void rds_ib_send_clear_ring(struct rds_ib_connection *ic); 332 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op); 333 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits); 334 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted); 335 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted, 336 u32 *adv_credits, int need_posted); 337 338 /* ib_stats.c */ 339 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats); 340 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member) 341 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter, 342 unsigned int avail); 343 344 /* ib_sysctl.c */ 345 int __init rds_ib_sysctl_init(void); 346 void rds_ib_sysctl_exit(void); 347 extern unsigned long rds_ib_sysctl_max_send_wr; 348 extern unsigned long rds_ib_sysctl_max_recv_wr; 349 extern unsigned long rds_ib_sysctl_max_unsig_wrs; 350 extern unsigned long rds_ib_sysctl_max_unsig_bytes; 351 extern unsigned long rds_ib_sysctl_max_recv_allocation; 352 extern unsigned int rds_ib_sysctl_flow_control; 353 extern ctl_table rds_ib_sysctl_table[]; 354 355 /* 356 * Helper functions for getting/setting the header and data SGEs in 357 * RDS packets (not RDMA) 358 */ 359 static inline struct ib_sge * 360 rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge) 361 { 362 return &sge[0]; 363 } 364 365 static inline struct ib_sge * 366 rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge) 367 { 368 return &sge[1]; 369 } 370 371 #endif 372