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 }; 224 225 /* This assumes that atomic_t is at least 32 bits */ 226 #define IB_GET_SEND_CREDITS(v) ((v) & 0xffff) 227 #define IB_GET_POST_CREDITS(v) ((v) >> 16) 228 #define IB_SET_SEND_CREDITS(v) ((v) & 0xffff) 229 #define IB_SET_POST_CREDITS(v) ((v) << 16) 230 231 struct rds_ib_ipaddr { 232 struct list_head list; 233 __be32 ipaddr; 234 struct rcu_head rcu; 235 }; 236 237 enum { 238 RDS_IB_MR_8K_POOL, 239 RDS_IB_MR_1M_POOL, 240 }; 241 242 struct rds_ib_device { 243 struct list_head list; 244 struct list_head ipaddr_list; 245 struct list_head conn_list; 246 struct ib_device *dev; 247 struct ib_pd *pd; 248 bool use_fastreg; 249 250 unsigned int max_mrs; 251 struct rds_ib_mr_pool *mr_1m_pool; 252 struct rds_ib_mr_pool *mr_8k_pool; 253 unsigned int fmr_max_remaps; 254 unsigned int max_8k_mrs; 255 unsigned int max_1m_mrs; 256 int max_sge; 257 unsigned int max_wrs; 258 unsigned int max_initiator_depth; 259 unsigned int max_responder_resources; 260 spinlock_t spinlock; /* protect the above */ 261 refcount_t refcount; 262 struct work_struct free_work; 263 int *vector_load; 264 }; 265 266 #define ibdev_to_node(ibdev) dev_to_node((ibdev)->dev.parent) 267 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev) 268 269 /* bits for i_ack_flags */ 270 #define IB_ACK_IN_FLIGHT 0 271 #define IB_ACK_REQUESTED 1 272 273 /* Magic WR_ID for ACKs */ 274 #define RDS_IB_ACK_WR_ID (~(u64) 0) 275 276 struct rds_ib_statistics { 277 uint64_t s_ib_connect_raced; 278 uint64_t s_ib_listen_closed_stale; 279 uint64_t s_ib_evt_handler_call; 280 uint64_t s_ib_tasklet_call; 281 uint64_t s_ib_tx_cq_event; 282 uint64_t s_ib_tx_ring_full; 283 uint64_t s_ib_tx_throttle; 284 uint64_t s_ib_tx_sg_mapping_failure; 285 uint64_t s_ib_tx_stalled; 286 uint64_t s_ib_tx_credit_updates; 287 uint64_t s_ib_rx_cq_event; 288 uint64_t s_ib_rx_ring_empty; 289 uint64_t s_ib_rx_refill_from_cq; 290 uint64_t s_ib_rx_refill_from_thread; 291 uint64_t s_ib_rx_alloc_limit; 292 uint64_t s_ib_rx_total_frags; 293 uint64_t s_ib_rx_total_incs; 294 uint64_t s_ib_rx_credit_updates; 295 uint64_t s_ib_ack_sent; 296 uint64_t s_ib_ack_send_failure; 297 uint64_t s_ib_ack_send_delayed; 298 uint64_t s_ib_ack_send_piggybacked; 299 uint64_t s_ib_ack_received; 300 uint64_t s_ib_rdma_mr_8k_alloc; 301 uint64_t s_ib_rdma_mr_8k_free; 302 uint64_t s_ib_rdma_mr_8k_used; 303 uint64_t s_ib_rdma_mr_8k_pool_flush; 304 uint64_t s_ib_rdma_mr_8k_pool_wait; 305 uint64_t s_ib_rdma_mr_8k_pool_depleted; 306 uint64_t s_ib_rdma_mr_1m_alloc; 307 uint64_t s_ib_rdma_mr_1m_free; 308 uint64_t s_ib_rdma_mr_1m_used; 309 uint64_t s_ib_rdma_mr_1m_pool_flush; 310 uint64_t s_ib_rdma_mr_1m_pool_wait; 311 uint64_t s_ib_rdma_mr_1m_pool_depleted; 312 uint64_t s_ib_rdma_mr_8k_reused; 313 uint64_t s_ib_rdma_mr_1m_reused; 314 uint64_t s_ib_atomic_cswp; 315 uint64_t s_ib_atomic_fadd; 316 uint64_t s_ib_recv_added_to_cache; 317 uint64_t s_ib_recv_removed_from_cache; 318 }; 319 320 extern struct workqueue_struct *rds_ib_wq; 321 322 /* 323 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h 324 * doesn't define it. 325 */ 326 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev, 327 struct scatterlist *sglist, 328 unsigned int sg_dma_len, 329 int direction) 330 { 331 struct scatterlist *sg; 332 unsigned int i; 333 334 for_each_sg(sglist, sg, sg_dma_len, i) { 335 ib_dma_sync_single_for_cpu(dev, sg_dma_address(sg), 336 sg_dma_len(sg), direction); 337 } 338 } 339 #define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu 340 341 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev, 342 struct scatterlist *sglist, 343 unsigned int sg_dma_len, 344 int direction) 345 { 346 struct scatterlist *sg; 347 unsigned int i; 348 349 for_each_sg(sglist, sg, sg_dma_len, i) { 350 ib_dma_sync_single_for_device(dev, sg_dma_address(sg), 351 sg_dma_len(sg), direction); 352 } 353 } 354 #define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device 355 356 357 /* ib.c */ 358 extern struct rds_transport rds_ib_transport; 359 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device); 360 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev); 361 extern struct ib_client rds_ib_client; 362 363 extern unsigned int rds_ib_retry_count; 364 365 extern spinlock_t ib_nodev_conns_lock; 366 extern struct list_head ib_nodev_conns; 367 368 /* ib_cm.c */ 369 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp); 370 void rds_ib_conn_free(void *arg); 371 int rds_ib_conn_path_connect(struct rds_conn_path *cp); 372 void rds_ib_conn_path_shutdown(struct rds_conn_path *cp); 373 void rds_ib_state_change(struct sock *sk); 374 int rds_ib_listen_init(void); 375 void rds_ib_listen_stop(void); 376 __printf(2, 3) 377 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...); 378 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, 379 struct rdma_cm_event *event, bool isv6); 380 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id, bool isv6); 381 void rds_ib_cm_connect_complete(struct rds_connection *conn, 382 struct rdma_cm_event *event); 383 384 385 #define rds_ib_conn_error(conn, fmt...) \ 386 __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt) 387 388 /* ib_rdma.c */ 389 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, 390 struct in6_addr *ipaddr); 391 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); 392 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); 393 void rds_ib_destroy_nodev_conns(void); 394 void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc); 395 396 /* ib_recv.c */ 397 int rds_ib_recv_init(void); 398 void rds_ib_recv_exit(void); 399 int rds_ib_recv_path(struct rds_conn_path *conn); 400 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic, gfp_t gfp); 401 void rds_ib_recv_free_caches(struct rds_ib_connection *ic); 402 void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp); 403 void rds_ib_inc_free(struct rds_incoming *inc); 404 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); 405 void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc, 406 struct rds_ib_ack_state *state); 407 void rds_ib_recv_tasklet_fn(unsigned long data); 408 void rds_ib_recv_init_ring(struct rds_ib_connection *ic); 409 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic); 410 void rds_ib_recv_init_ack(struct rds_ib_connection *ic); 411 void rds_ib_attempt_ack(struct rds_ib_connection *ic); 412 void rds_ib_ack_send_complete(struct rds_ib_connection *ic); 413 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic); 414 void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required); 415 416 /* ib_ring.c */ 417 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr); 418 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr); 419 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos); 420 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val); 421 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val); 422 int rds_ib_ring_empty(struct rds_ib_work_ring *ring); 423 int rds_ib_ring_low(struct rds_ib_work_ring *ring); 424 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring); 425 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest); 426 extern wait_queue_head_t rds_ib_ring_empty_wait; 427 428 /* ib_send.c */ 429 void rds_ib_xmit_path_complete(struct rds_conn_path *cp); 430 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm, 431 unsigned int hdr_off, unsigned int sg, unsigned int off); 432 void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc); 433 void rds_ib_send_init_ring(struct rds_ib_connection *ic); 434 void rds_ib_send_clear_ring(struct rds_ib_connection *ic); 435 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op); 436 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits); 437 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted); 438 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted, 439 u32 *adv_credits, int need_posted, int max_posted); 440 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op); 441 442 /* ib_stats.c */ 443 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_ib_statistics, rds_ib_stats); 444 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member) 445 #define rds_ib_stats_add(member, count) \ 446 rds_stats_add_which(rds_ib_stats, member, count) 447 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter, 448 unsigned int avail); 449 450 /* ib_sysctl.c */ 451 int rds_ib_sysctl_init(void); 452 void rds_ib_sysctl_exit(void); 453 extern unsigned long rds_ib_sysctl_max_send_wr; 454 extern unsigned long rds_ib_sysctl_max_recv_wr; 455 extern unsigned long rds_ib_sysctl_max_unsig_wrs; 456 extern unsigned long rds_ib_sysctl_max_unsig_bytes; 457 extern unsigned long rds_ib_sysctl_max_recv_allocation; 458 extern unsigned int rds_ib_sysctl_flow_control; 459 460 #endif 461