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 <linux/interrupt.h> 7 #include <linux/pci.h> 8 #include <linux/slab.h> 9 #include "rds.h" 10 #include "rdma_transport.h" 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 #define RDS_IB_DEFAULT_FR_WR 512 18 19 #define RDS_IB_DEFAULT_RETRY_COUNT 2 20 21 #define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */ 22 23 #define RDS_IB_RECYCLE_BATCH_COUNT 32 24 25 #define RDS_IB_WC_MAX 32 26 27 extern struct rw_semaphore rds_ib_devices_lock; 28 extern struct list_head rds_ib_devices; 29 30 /* 31 * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to 32 * try and minimize the amount of memory tied up both the device and 33 * socket receive queues. 34 */ 35 struct rds_page_frag { 36 struct list_head f_item; 37 struct list_head f_cache_entry; 38 struct scatterlist f_sg; 39 }; 40 41 struct rds_ib_incoming { 42 struct list_head ii_frags; 43 struct list_head ii_cache_entry; 44 struct rds_incoming ii_inc; 45 }; 46 47 struct rds_ib_cache_head { 48 struct list_head *first; 49 unsigned long count; 50 }; 51 52 struct rds_ib_refill_cache { 53 struct rds_ib_cache_head __percpu *percpu; 54 struct list_head *xfer; 55 struct list_head *ready; 56 }; 57 58 struct rds_ib_connect_private { 59 /* Add new fields at the end, and don't permute existing fields. */ 60 __be32 dp_saddr; 61 __be32 dp_daddr; 62 u8 dp_protocol_major; 63 u8 dp_protocol_minor; 64 __be16 dp_protocol_minor_mask; /* bitmask */ 65 __be32 dp_reserved1; 66 __be64 dp_ack_seq; 67 __be32 dp_credit; /* non-zero enables flow ctl */ 68 }; 69 70 struct rds_ib_send_work { 71 void *s_op; 72 union { 73 struct ib_send_wr s_wr; 74 struct ib_rdma_wr s_rdma_wr; 75 struct ib_atomic_wr s_atomic_wr; 76 }; 77 struct ib_sge s_sge[RDS_IB_MAX_SGE]; 78 unsigned long s_queued; 79 }; 80 81 struct rds_ib_recv_work { 82 struct rds_ib_incoming *r_ibinc; 83 struct rds_page_frag *r_frag; 84 struct ib_recv_wr r_wr; 85 struct ib_sge r_sge[2]; 86 }; 87 88 struct rds_ib_work_ring { 89 u32 w_nr; 90 u32 w_alloc_ptr; 91 u32 w_alloc_ctr; 92 u32 w_free_ptr; 93 atomic_t w_free_ctr; 94 }; 95 96 /* Rings are posted with all the allocations they'll need to queue the 97 * incoming message to the receiving socket so this can't fail. 98 * All fragments start with a header, so we can make sure we're not receiving 99 * garbage, and we can tell a small 8 byte fragment from an ACK frame. 100 */ 101 struct rds_ib_ack_state { 102 u64 ack_next; 103 u64 ack_recv; 104 unsigned int ack_required:1; 105 unsigned int ack_next_valid:1; 106 unsigned int ack_recv_valid:1; 107 }; 108 109 110 struct rds_ib_device; 111 112 struct rds_ib_connection { 113 114 struct list_head ib_node; 115 struct rds_ib_device *rds_ibdev; 116 struct rds_connection *conn; 117 118 /* alphabet soup, IBTA style */ 119 struct rdma_cm_id *i_cm_id; 120 struct ib_pd *i_pd; 121 struct ib_cq *i_send_cq; 122 struct ib_cq *i_recv_cq; 123 struct ib_wc i_send_wc[RDS_IB_WC_MAX]; 124 struct ib_wc i_recv_wc[RDS_IB_WC_MAX]; 125 126 /* To control the number of wrs from fastreg */ 127 atomic_t i_fastreg_wrs; 128 129 /* interrupt handling */ 130 struct tasklet_struct i_send_tasklet; 131 struct tasklet_struct i_recv_tasklet; 132 133 /* tx */ 134 struct rds_ib_work_ring i_send_ring; 135 struct rm_data_op *i_data_op; 136 struct rds_header *i_send_hdrs; 137 u64 i_send_hdrs_dma; 138 struct rds_ib_send_work *i_sends; 139 atomic_t i_signaled_sends; 140 141 /* rx */ 142 struct mutex i_recv_mutex; 143 struct rds_ib_work_ring i_recv_ring; 144 struct rds_ib_incoming *i_ibinc; 145 u32 i_recv_data_rem; 146 struct rds_header *i_recv_hdrs; 147 u64 i_recv_hdrs_dma; 148 struct rds_ib_recv_work *i_recvs; 149 u64 i_ack_recv; /* last ACK received */ 150 struct rds_ib_refill_cache i_cache_incs; 151 struct rds_ib_refill_cache i_cache_frags; 152 153 /* sending acks */ 154 unsigned long i_ack_flags; 155 #ifdef KERNEL_HAS_ATOMIC64 156 atomic64_t i_ack_next; /* next ACK to send */ 157 #else 158 spinlock_t i_ack_lock; /* protect i_ack_next */ 159 u64 i_ack_next; /* next ACK to send */ 160 #endif 161 struct rds_header *i_ack; 162 struct ib_send_wr i_ack_wr; 163 struct ib_sge i_ack_sge; 164 u64 i_ack_dma; 165 unsigned long i_ack_queued; 166 167 /* Flow control related information 168 * 169 * Our algorithm uses a pair variables that we need to access 170 * atomically - one for the send credits, and one posted 171 * recv credits we need to transfer to remote. 172 * Rather than protect them using a slow spinlock, we put both into 173 * a single atomic_t and update it using cmpxchg 174 */ 175 atomic_t i_credits; 176 177 /* Protocol version specific information */ 178 unsigned int i_flowctl:1; /* enable/disable flow ctl */ 179 180 /* Batched completions */ 181 unsigned int i_unsignaled_wrs; 182 }; 183 184 /* This assumes that atomic_t is at least 32 bits */ 185 #define IB_GET_SEND_CREDITS(v) ((v) & 0xffff) 186 #define IB_GET_POST_CREDITS(v) ((v) >> 16) 187 #define IB_SET_SEND_CREDITS(v) ((v) & 0xffff) 188 #define IB_SET_POST_CREDITS(v) ((v) << 16) 189 190 struct rds_ib_ipaddr { 191 struct list_head list; 192 __be32 ipaddr; 193 struct rcu_head rcu; 194 }; 195 196 enum { 197 RDS_IB_MR_8K_POOL, 198 RDS_IB_MR_1M_POOL, 199 }; 200 201 struct rds_ib_device { 202 struct list_head list; 203 struct list_head ipaddr_list; 204 struct list_head conn_list; 205 struct ib_device *dev; 206 struct ib_pd *pd; 207 bool has_fmr; 208 bool has_fr; 209 bool use_fastreg; 210 211 unsigned int max_mrs; 212 struct rds_ib_mr_pool *mr_1m_pool; 213 struct rds_ib_mr_pool *mr_8k_pool; 214 unsigned int fmr_max_remaps; 215 unsigned int max_8k_mrs; 216 unsigned int max_1m_mrs; 217 int max_sge; 218 unsigned int max_wrs; 219 unsigned int max_initiator_depth; 220 unsigned int max_responder_resources; 221 spinlock_t spinlock; /* protect the above */ 222 atomic_t refcount; 223 struct work_struct free_work; 224 }; 225 226 #define ibdev_to_node(ibdev) dev_to_node(ibdev->dma_device) 227 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev) 228 229 /* bits for i_ack_flags */ 230 #define IB_ACK_IN_FLIGHT 0 231 #define IB_ACK_REQUESTED 1 232 233 /* Magic WR_ID for ACKs */ 234 #define RDS_IB_ACK_WR_ID (~(u64) 0) 235 236 struct rds_ib_statistics { 237 uint64_t s_ib_connect_raced; 238 uint64_t s_ib_listen_closed_stale; 239 uint64_t s_ib_evt_handler_call; 240 uint64_t s_ib_tasklet_call; 241 uint64_t s_ib_tx_cq_event; 242 uint64_t s_ib_tx_ring_full; 243 uint64_t s_ib_tx_throttle; 244 uint64_t s_ib_tx_sg_mapping_failure; 245 uint64_t s_ib_tx_stalled; 246 uint64_t s_ib_tx_credit_updates; 247 uint64_t s_ib_rx_cq_event; 248 uint64_t s_ib_rx_ring_empty; 249 uint64_t s_ib_rx_refill_from_cq; 250 uint64_t s_ib_rx_refill_from_thread; 251 uint64_t s_ib_rx_alloc_limit; 252 uint64_t s_ib_rx_credit_updates; 253 uint64_t s_ib_ack_sent; 254 uint64_t s_ib_ack_send_failure; 255 uint64_t s_ib_ack_send_delayed; 256 uint64_t s_ib_ack_send_piggybacked; 257 uint64_t s_ib_ack_received; 258 uint64_t s_ib_rdma_mr_8k_alloc; 259 uint64_t s_ib_rdma_mr_8k_free; 260 uint64_t s_ib_rdma_mr_8k_used; 261 uint64_t s_ib_rdma_mr_8k_pool_flush; 262 uint64_t s_ib_rdma_mr_8k_pool_wait; 263 uint64_t s_ib_rdma_mr_8k_pool_depleted; 264 uint64_t s_ib_rdma_mr_1m_alloc; 265 uint64_t s_ib_rdma_mr_1m_free; 266 uint64_t s_ib_rdma_mr_1m_used; 267 uint64_t s_ib_rdma_mr_1m_pool_flush; 268 uint64_t s_ib_rdma_mr_1m_pool_wait; 269 uint64_t s_ib_rdma_mr_1m_pool_depleted; 270 uint64_t s_ib_rdma_mr_8k_reused; 271 uint64_t s_ib_rdma_mr_1m_reused; 272 uint64_t s_ib_atomic_cswp; 273 uint64_t s_ib_atomic_fadd; 274 }; 275 276 extern struct workqueue_struct *rds_ib_wq; 277 278 /* 279 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h 280 * doesn't define it. 281 */ 282 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev, 283 struct scatterlist *sglist, 284 unsigned int sg_dma_len, 285 int direction) 286 { 287 struct scatterlist *sg; 288 unsigned int i; 289 290 for_each_sg(sglist, sg, sg_dma_len, i) { 291 ib_dma_sync_single_for_cpu(dev, 292 ib_sg_dma_address(dev, sg), 293 ib_sg_dma_len(dev, sg), 294 direction); 295 } 296 } 297 #define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu 298 299 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev, 300 struct scatterlist *sglist, 301 unsigned int sg_dma_len, 302 int direction) 303 { 304 struct scatterlist *sg; 305 unsigned int i; 306 307 for_each_sg(sglist, sg, sg_dma_len, i) { 308 ib_dma_sync_single_for_device(dev, 309 ib_sg_dma_address(dev, sg), 310 ib_sg_dma_len(dev, sg), 311 direction); 312 } 313 } 314 #define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device 315 316 317 /* ib.c */ 318 extern struct rds_transport rds_ib_transport; 319 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device); 320 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev); 321 extern struct ib_client rds_ib_client; 322 323 extern unsigned int rds_ib_retry_count; 324 325 extern spinlock_t ib_nodev_conns_lock; 326 extern struct list_head ib_nodev_conns; 327 328 /* ib_cm.c */ 329 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp); 330 void rds_ib_conn_free(void *arg); 331 int rds_ib_conn_connect(struct rds_connection *conn); 332 void rds_ib_conn_shutdown(struct rds_connection *conn); 333 void rds_ib_state_change(struct sock *sk); 334 int rds_ib_listen_init(void); 335 void rds_ib_listen_stop(void); 336 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...); 337 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, 338 struct rdma_cm_event *event); 339 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id); 340 void rds_ib_cm_connect_complete(struct rds_connection *conn, 341 struct rdma_cm_event *event); 342 343 344 #define rds_ib_conn_error(conn, fmt...) \ 345 __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt) 346 347 /* ib_rdma.c */ 348 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr); 349 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); 350 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); 351 void rds_ib_destroy_nodev_conns(void); 352 void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc); 353 354 /* ib_recv.c */ 355 int rds_ib_recv_init(void); 356 void rds_ib_recv_exit(void); 357 int rds_ib_recv(struct rds_connection *conn); 358 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic); 359 void rds_ib_recv_free_caches(struct rds_ib_connection *ic); 360 void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp); 361 void rds_ib_inc_free(struct rds_incoming *inc); 362 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); 363 void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc, 364 struct rds_ib_ack_state *state); 365 void rds_ib_recv_tasklet_fn(unsigned long data); 366 void rds_ib_recv_init_ring(struct rds_ib_connection *ic); 367 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic); 368 void rds_ib_recv_init_ack(struct rds_ib_connection *ic); 369 void rds_ib_attempt_ack(struct rds_ib_connection *ic); 370 void rds_ib_ack_send_complete(struct rds_ib_connection *ic); 371 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic); 372 void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required); 373 374 /* ib_ring.c */ 375 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr); 376 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr); 377 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos); 378 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val); 379 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val); 380 int rds_ib_ring_empty(struct rds_ib_work_ring *ring); 381 int rds_ib_ring_low(struct rds_ib_work_ring *ring); 382 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring); 383 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest); 384 extern wait_queue_head_t rds_ib_ring_empty_wait; 385 386 /* ib_send.c */ 387 void rds_ib_xmit_complete(struct rds_connection *conn); 388 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm, 389 unsigned int hdr_off, unsigned int sg, unsigned int off); 390 void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc); 391 void rds_ib_send_init_ring(struct rds_ib_connection *ic); 392 void rds_ib_send_clear_ring(struct rds_ib_connection *ic); 393 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op); 394 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits); 395 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted); 396 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted, 397 u32 *adv_credits, int need_posted, int max_posted); 398 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op); 399 400 /* ib_stats.c */ 401 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats); 402 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member) 403 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter, 404 unsigned int avail); 405 406 /* ib_sysctl.c */ 407 int rds_ib_sysctl_init(void); 408 void rds_ib_sysctl_exit(void); 409 extern unsigned long rds_ib_sysctl_max_send_wr; 410 extern unsigned long rds_ib_sysctl_max_recv_wr; 411 extern unsigned long rds_ib_sysctl_max_unsig_wrs; 412 extern unsigned long rds_ib_sysctl_max_unsig_bytes; 413 extern unsigned long rds_ib_sysctl_max_recv_allocation; 414 extern unsigned int rds_ib_sysctl_flow_control; 415 416 #endif 417