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