1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _RDS_IB_H 3 #define _RDS_IB_H 4 5 #include <rdma/ib_verbs.h> 6 #include <rdma/rdma_cm.h> 7 #include <linux/interrupt.h> 8 #include <linux/pci.h> 9 #include <linux/slab.h> 10 #include "rds.h" 11 #include "rdma_transport.h" 12 13 #define RDS_IB_MAX_SGE 8 14 #define RDS_IB_RECV_SGE 2 15 16 #define RDS_IB_DEFAULT_RECV_WR 1024 17 #define RDS_IB_DEFAULT_SEND_WR 256 18 #define RDS_IB_DEFAULT_FR_WR 512 19 20 #define RDS_IB_DEFAULT_RETRY_COUNT 1 21 22 #define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */ 23 24 #define RDS_IB_RECYCLE_BATCH_COUNT 32 25 26 #define RDS_IB_WC_MAX 32 27 28 extern struct rw_semaphore rds_ib_devices_lock; 29 extern struct list_head rds_ib_devices; 30 31 /* 32 * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to 33 * try and minimize the amount of memory tied up both the device and 34 * socket receive queues. 35 */ 36 struct rds_page_frag { 37 struct list_head f_item; 38 struct list_head f_cache_entry; 39 struct scatterlist f_sg; 40 }; 41 42 struct rds_ib_incoming { 43 struct list_head ii_frags; 44 struct list_head ii_cache_entry; 45 struct rds_incoming ii_inc; 46 }; 47 48 struct rds_ib_cache_head { 49 struct list_head *first; 50 unsigned long count; 51 }; 52 53 struct rds_ib_refill_cache { 54 struct rds_ib_cache_head __percpu *percpu; 55 struct list_head *xfer; 56 struct list_head *ready; 57 }; 58 59 /* This is the common structure for the IB private data exchange in setting up 60 * an RDS connection. The exchange is different for IPv4 and IPv6 connections. 61 * The reason is that the address size is different and the addresses 62 * exchanged are in the beginning of the structure. Hence it is not possible 63 * for interoperability if same structure is used. 64 */ 65 struct rds_ib_conn_priv_cmn { 66 u8 ricpc_protocol_major; 67 u8 ricpc_protocol_minor; 68 __be16 ricpc_protocol_minor_mask; /* bitmask */ 69 u8 ricpc_dp_toss; 70 u8 ripc_reserved1; 71 __be16 ripc_reserved2; 72 __be64 ricpc_ack_seq; 73 __be32 ricpc_credit; /* non-zero enables flow ctl */ 74 }; 75 76 struct rds_ib_connect_private { 77 /* Add new fields at the end, and don't permute existing fields. */ 78 __be32 dp_saddr; 79 __be32 dp_daddr; 80 struct rds_ib_conn_priv_cmn dp_cmn; 81 }; 82 83 struct rds6_ib_connect_private { 84 /* Add new fields at the end, and don't permute existing fields. */ 85 struct in6_addr dp_saddr; 86 struct in6_addr dp_daddr; 87 struct rds_ib_conn_priv_cmn dp_cmn; 88 }; 89 90 #define dp_protocol_major dp_cmn.ricpc_protocol_major 91 #define dp_protocol_minor dp_cmn.ricpc_protocol_minor 92 #define dp_protocol_minor_mask dp_cmn.ricpc_protocol_minor_mask 93 #define dp_ack_seq dp_cmn.ricpc_ack_seq 94 #define dp_credit dp_cmn.ricpc_credit 95 96 union rds_ib_conn_priv { 97 struct rds_ib_connect_private ricp_v4; 98 struct rds6_ib_connect_private ricp_v6; 99 }; 100 101 struct rds_ib_send_work { 102 void *s_op; 103 union { 104 struct ib_send_wr s_wr; 105 struct ib_rdma_wr s_rdma_wr; 106 struct ib_atomic_wr s_atomic_wr; 107 }; 108 struct ib_sge s_sge[RDS_IB_MAX_SGE]; 109 unsigned long s_queued; 110 }; 111 112 struct rds_ib_recv_work { 113 struct rds_ib_incoming *r_ibinc; 114 struct rds_page_frag *r_frag; 115 struct ib_recv_wr r_wr; 116 struct ib_sge r_sge[2]; 117 }; 118 119 struct rds_ib_work_ring { 120 u32 w_nr; 121 u32 w_alloc_ptr; 122 u32 w_alloc_ctr; 123 u32 w_free_ptr; 124 atomic_t w_free_ctr; 125 }; 126 127 /* Rings are posted with all the allocations they'll need to queue the 128 * incoming message to the receiving socket so this can't fail. 129 * All fragments start with a header, so we can make sure we're not receiving 130 * garbage, and we can tell a small 8 byte fragment from an ACK frame. 131 */ 132 struct rds_ib_ack_state { 133 u64 ack_next; 134 u64 ack_recv; 135 unsigned int ack_required:1; 136 unsigned int ack_next_valid:1; 137 unsigned int ack_recv_valid:1; 138 }; 139 140 141 struct rds_ib_device; 142 143 struct rds_ib_connection { 144 145 struct list_head ib_node; 146 struct rds_ib_device *rds_ibdev; 147 struct rds_connection *conn; 148 149 /* alphabet soup, IBTA style */ 150 struct rdma_cm_id *i_cm_id; 151 struct ib_pd *i_pd; 152 struct ib_cq *i_send_cq; 153 struct ib_cq *i_recv_cq; 154 struct ib_wc i_send_wc[RDS_IB_WC_MAX]; 155 struct ib_wc i_recv_wc[RDS_IB_WC_MAX]; 156 157 /* To control the number of wrs from fastreg */ 158 atomic_t i_fastreg_wrs; 159 atomic_t i_fastreg_inuse_count; 160 161 /* interrupt handling */ 162 struct tasklet_struct i_send_tasklet; 163 struct tasklet_struct i_recv_tasklet; 164 165 /* tx */ 166 struct rds_ib_work_ring i_send_ring; 167 struct rm_data_op *i_data_op; 168 struct rds_header **i_send_hdrs; 169 dma_addr_t *i_send_hdrs_dma; 170 struct rds_ib_send_work *i_sends; 171 atomic_t i_signaled_sends; 172 173 /* rx */ 174 struct mutex i_recv_mutex; 175 struct rds_ib_work_ring i_recv_ring; 176 struct rds_ib_incoming *i_ibinc; 177 u32 i_recv_data_rem; 178 struct rds_header **i_recv_hdrs; 179 dma_addr_t *i_recv_hdrs_dma; 180 struct rds_ib_recv_work *i_recvs; 181 u64 i_ack_recv; /* last ACK received */ 182 struct rds_ib_refill_cache i_cache_incs; 183 struct rds_ib_refill_cache i_cache_frags; 184 atomic_t i_cache_allocs; 185 186 /* sending acks */ 187 unsigned long i_ack_flags; 188 #ifdef KERNEL_HAS_ATOMIC64 189 atomic64_t i_ack_next; /* next ACK to send */ 190 #else 191 spinlock_t i_ack_lock; /* protect i_ack_next */ 192 u64 i_ack_next; /* next ACK to send */ 193 #endif 194 struct rds_header *i_ack; 195 struct ib_send_wr i_ack_wr; 196 struct ib_sge i_ack_sge; 197 dma_addr_t i_ack_dma; 198 unsigned long i_ack_queued; 199 200 /* Flow control related information 201 * 202 * Our algorithm uses a pair variables that we need to access 203 * atomically - one for the send credits, and one posted 204 * recv credits we need to transfer to remote. 205 * Rather than protect them using a slow spinlock, we put both into 206 * a single atomic_t and update it using cmpxchg 207 */ 208 atomic_t i_credits; 209 210 /* Protocol version specific information */ 211 unsigned int i_flowctl:1; /* enable/disable flow ctl */ 212 213 /* Batched completions */ 214 unsigned int i_unsignaled_wrs; 215 216 /* Endpoint role in connection */ 217 bool i_active_side; 218 atomic_t i_cq_quiesce; 219 220 /* Send/Recv vectors */ 221 int i_scq_vector; 222 int i_rcq_vector; 223 u8 i_sl; 224 }; 225 226 /* This assumes that atomic_t is at least 32 bits */ 227 #define IB_GET_SEND_CREDITS(v) ((v) & 0xffff) 228 #define IB_GET_POST_CREDITS(v) ((v) >> 16) 229 #define IB_SET_SEND_CREDITS(v) ((v) & 0xffff) 230 #define IB_SET_POST_CREDITS(v) ((v) << 16) 231 232 struct rds_ib_ipaddr { 233 struct list_head list; 234 __be32 ipaddr; 235 struct rcu_head rcu; 236 }; 237 238 enum { 239 RDS_IB_MR_8K_POOL, 240 RDS_IB_MR_1M_POOL, 241 }; 242 243 struct rds_ib_device { 244 struct list_head list; 245 struct list_head ipaddr_list; 246 struct list_head conn_list; 247 struct ib_device *dev; 248 struct ib_pd *pd; 249 struct dma_pool *rid_hdrs_pool; /* RDS headers DMA pool */ 250 u8 use_fastreg:1; 251 u8 odp_capable:1; 252 253 unsigned int max_mrs; 254 struct rds_ib_mr_pool *mr_1m_pool; 255 struct rds_ib_mr_pool *mr_8k_pool; 256 unsigned int fmr_max_remaps; 257 unsigned int max_8k_mrs; 258 unsigned int max_1m_mrs; 259 int max_sge; 260 unsigned int max_wrs; 261 unsigned int max_initiator_depth; 262 unsigned int max_responder_resources; 263 spinlock_t spinlock; /* protect the above */ 264 refcount_t refcount; 265 struct work_struct free_work; 266 int *vector_load; 267 }; 268 269 #define ibdev_to_node(ibdev) dev_to_node((ibdev)->dev.parent) 270 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev) 271 272 /* bits for i_ack_flags */ 273 #define IB_ACK_IN_FLIGHT 0 274 #define IB_ACK_REQUESTED 1 275 276 /* Magic WR_ID for ACKs */ 277 #define RDS_IB_ACK_WR_ID (~(u64) 0) 278 279 struct rds_ib_statistics { 280 uint64_t s_ib_connect_raced; 281 uint64_t s_ib_listen_closed_stale; 282 uint64_t s_ib_evt_handler_call; 283 uint64_t s_ib_tasklet_call; 284 uint64_t s_ib_tx_cq_event; 285 uint64_t s_ib_tx_ring_full; 286 uint64_t s_ib_tx_throttle; 287 uint64_t s_ib_tx_sg_mapping_failure; 288 uint64_t s_ib_tx_stalled; 289 uint64_t s_ib_tx_credit_updates; 290 uint64_t s_ib_rx_cq_event; 291 uint64_t s_ib_rx_ring_empty; 292 uint64_t s_ib_rx_refill_from_cq; 293 uint64_t s_ib_rx_refill_from_thread; 294 uint64_t s_ib_rx_alloc_limit; 295 uint64_t s_ib_rx_total_frags; 296 uint64_t s_ib_rx_total_incs; 297 uint64_t s_ib_rx_credit_updates; 298 uint64_t s_ib_ack_sent; 299 uint64_t s_ib_ack_send_failure; 300 uint64_t s_ib_ack_send_delayed; 301 uint64_t s_ib_ack_send_piggybacked; 302 uint64_t s_ib_ack_received; 303 uint64_t s_ib_rdma_mr_8k_alloc; 304 uint64_t s_ib_rdma_mr_8k_free; 305 uint64_t s_ib_rdma_mr_8k_used; 306 uint64_t s_ib_rdma_mr_8k_pool_flush; 307 uint64_t s_ib_rdma_mr_8k_pool_wait; 308 uint64_t s_ib_rdma_mr_8k_pool_depleted; 309 uint64_t s_ib_rdma_mr_1m_alloc; 310 uint64_t s_ib_rdma_mr_1m_free; 311 uint64_t s_ib_rdma_mr_1m_used; 312 uint64_t s_ib_rdma_mr_1m_pool_flush; 313 uint64_t s_ib_rdma_mr_1m_pool_wait; 314 uint64_t s_ib_rdma_mr_1m_pool_depleted; 315 uint64_t s_ib_rdma_mr_8k_reused; 316 uint64_t s_ib_rdma_mr_1m_reused; 317 uint64_t s_ib_atomic_cswp; 318 uint64_t s_ib_atomic_fadd; 319 uint64_t s_ib_recv_added_to_cache; 320 uint64_t s_ib_recv_removed_from_cache; 321 }; 322 323 extern struct workqueue_struct *rds_ib_wq; 324 325 /* 326 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h 327 * doesn't define it. 328 */ 329 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev, 330 struct scatterlist *sglist, 331 unsigned int sg_dma_len, 332 int direction) 333 { 334 struct scatterlist *sg; 335 unsigned int i; 336 337 for_each_sg(sglist, sg, sg_dma_len, i) { 338 ib_dma_sync_single_for_cpu(dev, sg_dma_address(sg), 339 sg_dma_len(sg), direction); 340 } 341 } 342 #define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu 343 344 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev, 345 struct scatterlist *sglist, 346 unsigned int sg_dma_len, 347 int direction) 348 { 349 struct scatterlist *sg; 350 unsigned int i; 351 352 for_each_sg(sglist, sg, sg_dma_len, i) { 353 ib_dma_sync_single_for_device(dev, sg_dma_address(sg), 354 sg_dma_len(sg), direction); 355 } 356 } 357 #define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device 358 359 360 /* ib.c */ 361 extern struct rds_transport rds_ib_transport; 362 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device); 363 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev); 364 extern struct ib_client rds_ib_client; 365 366 extern unsigned int rds_ib_retry_count; 367 368 extern spinlock_t ib_nodev_conns_lock; 369 extern struct list_head ib_nodev_conns; 370 371 /* ib_cm.c */ 372 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp); 373 void rds_ib_conn_free(void *arg); 374 int rds_ib_conn_path_connect(struct rds_conn_path *cp); 375 void rds_ib_conn_path_shutdown(struct rds_conn_path *cp); 376 void rds_ib_state_change(struct sock *sk); 377 int rds_ib_listen_init(void); 378 void rds_ib_listen_stop(void); 379 __printf(2, 3) 380 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...); 381 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, 382 struct rdma_cm_event *event, bool isv6); 383 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id, bool isv6); 384 void rds_ib_cm_connect_complete(struct rds_connection *conn, 385 struct rdma_cm_event *event); 386 struct rds_header **rds_dma_hdrs_alloc(struct ib_device *ibdev, 387 struct dma_pool *pool, 388 dma_addr_t **dma_addrs, u32 num_hdrs); 389 void rds_dma_hdrs_free(struct dma_pool *pool, struct rds_header **hdrs, 390 dma_addr_t *dma_addrs, u32 num_hdrs); 391 392 #define rds_ib_conn_error(conn, fmt...) \ 393 __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt) 394 395 /* ib_rdma.c */ 396 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, 397 struct in6_addr *ipaddr); 398 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); 399 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); 400 void rds_ib_destroy_nodev_conns(void); 401 void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc); 402 403 /* ib_recv.c */ 404 int rds_ib_recv_init(void); 405 void rds_ib_recv_exit(void); 406 int rds_ib_recv_path(struct rds_conn_path *conn); 407 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic, gfp_t gfp); 408 void rds_ib_recv_free_caches(struct rds_ib_connection *ic); 409 void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp); 410 void rds_ib_inc_free(struct rds_incoming *inc); 411 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); 412 void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc, 413 struct rds_ib_ack_state *state); 414 void rds_ib_recv_tasklet_fn(unsigned long data); 415 void rds_ib_recv_init_ring(struct rds_ib_connection *ic); 416 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic); 417 void rds_ib_recv_init_ack(struct rds_ib_connection *ic); 418 void rds_ib_attempt_ack(struct rds_ib_connection *ic); 419 void rds_ib_ack_send_complete(struct rds_ib_connection *ic); 420 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic); 421 void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required); 422 423 /* ib_ring.c */ 424 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr); 425 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr); 426 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos); 427 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val); 428 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val); 429 int rds_ib_ring_empty(struct rds_ib_work_ring *ring); 430 int rds_ib_ring_low(struct rds_ib_work_ring *ring); 431 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring); 432 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest); 433 extern wait_queue_head_t rds_ib_ring_empty_wait; 434 435 /* ib_send.c */ 436 void rds_ib_xmit_path_complete(struct rds_conn_path *cp); 437 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm, 438 unsigned int hdr_off, unsigned int sg, unsigned int off); 439 void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc); 440 void rds_ib_send_init_ring(struct rds_ib_connection *ic); 441 void rds_ib_send_clear_ring(struct rds_ib_connection *ic); 442 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op); 443 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits); 444 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted); 445 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted, 446 u32 *adv_credits, int need_posted, int max_posted); 447 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op); 448 449 /* ib_stats.c */ 450 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_ib_statistics, rds_ib_stats); 451 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member) 452 #define rds_ib_stats_add(member, count) \ 453 rds_stats_add_which(rds_ib_stats, member, count) 454 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter, 455 unsigned int avail); 456 457 /* ib_sysctl.c */ 458 int rds_ib_sysctl_init(void); 459 void rds_ib_sysctl_exit(void); 460 extern unsigned long rds_ib_sysctl_max_send_wr; 461 extern unsigned long rds_ib_sysctl_max_recv_wr; 462 extern unsigned long rds_ib_sysctl_max_unsig_wrs; 463 extern unsigned long rds_ib_sysctl_max_unsig_bytes; 464 extern unsigned long rds_ib_sysctl_max_recv_allocation; 465 extern unsigned int rds_ib_sysctl_flow_control; 466 467 #endif 468