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rdmavt_qp.h
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linux-6.19.14/include/rdma/rdmavt_qp.h
1/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */ 2/* 3 * Copyright(c) 2016 - 2020 Intel Corporation. 4 */ 5 6#ifndef DEF_RDMAVT_INCQP_H 7#define DEF_RDMAVT_INCQP_H 8 9#include <rdma/rdma_vt.h> 10#include <rdma/ib_pack.h> 11#include <rdma/ib_verbs.h> 12#include <rdma/rdmavt_cq.h> 13#include <rdma/rvt-abi.h> 14#include <linux/vmalloc.h> 15/* 16 * Atomic bit definitions for r_aflags. 17 */ 18#define RVT_R_WRID_VALID 0 19#define RVT_R_REWIND_SGE 1 20 21/* 22 * Bit definitions for r_flags. 23 */ 24#define RVT_R_REUSE_SGE 0x01 25#define RVT_R_RDMAR_SEQ 0x02 26#define RVT_R_RSP_NAK 0x04 27#define RVT_R_RSP_SEND 0x08 28#define RVT_R_COMM_EST 0x10 29 30/* 31 * If a packet's QP[23:16] bits match this value, then it is 32 * a PSM packet and the hardware will expect a KDETH header 33 * following the BTH. 34 */ 35#define RVT_KDETH_QP_PREFIX 0x80 36#define RVT_KDETH_QP_SUFFIX 0xffff 37#define RVT_KDETH_QP_PREFIX_MASK 0x00ff0000 38#define RVT_KDETH_QP_PREFIX_SHIFT 16 39#define RVT_KDETH_QP_BASE (u32)(RVT_KDETH_QP_PREFIX << \ 40 RVT_KDETH_QP_PREFIX_SHIFT) 41#define RVT_KDETH_QP_MAX (u32)(RVT_KDETH_QP_BASE + RVT_KDETH_QP_SUFFIX) 42 43/* 44 * If a packet's LNH == BTH and DEST QPN[23:16] in the BTH match this 45 * prefix value, then it is an AIP packet with a DETH containing the entropy 46 * value in byte 4 following the BTH. 47 */ 48#define RVT_AIP_QP_PREFIX 0x81 49#define RVT_AIP_QP_SUFFIX 0xffff 50#define RVT_AIP_QP_PREFIX_MASK 0x00ff0000 51#define RVT_AIP_QP_PREFIX_SHIFT 16 52#define RVT_AIP_QP_BASE (u32)(RVT_AIP_QP_PREFIX << \ 53 RVT_AIP_QP_PREFIX_SHIFT) 54#define RVT_AIP_QPN_MAX BIT(RVT_AIP_QP_PREFIX_SHIFT) 55#define RVT_AIP_QP_MAX (u32)(RVT_AIP_QP_BASE + RVT_AIP_QPN_MAX - 1) 56 57/* 58 * Bit definitions for s_flags. 59 * 60 * RVT_S_SIGNAL_REQ_WR - set if QP send WRs contain completion signaled 61 * RVT_S_BUSY - send tasklet is processing the QP 62 * RVT_S_TIMER - the RC retry timer is active 63 * RVT_S_ACK_PENDING - an ACK is waiting to be sent after RDMA read/atomics 64 * RVT_S_WAIT_FENCE - waiting for all prior RDMA read or atomic SWQEs 65 * before processing the next SWQE 66 * RVT_S_WAIT_RDMAR - waiting for a RDMA read or atomic SWQE to complete 67 * before processing the next SWQE 68 * RVT_S_WAIT_RNR - waiting for RNR timeout 69 * RVT_S_WAIT_SSN_CREDIT - waiting for RC credits to process next SWQE 70 * RVT_S_WAIT_DMA - waiting for send DMA queue to drain before generating 71 * next send completion entry not via send DMA 72 * RVT_S_WAIT_PIO - waiting for a send buffer to be available 73 * RVT_S_WAIT_TX - waiting for a struct verbs_txreq to be available 74 * RVT_S_WAIT_DMA_DESC - waiting for DMA descriptors to be available 75 * RVT_S_WAIT_KMEM - waiting for kernel memory to be available 76 * RVT_S_WAIT_PSN - waiting for a packet to exit the send DMA queue 77 * RVT_S_WAIT_ACK - waiting for an ACK packet before sending more requests 78 * RVT_S_SEND_ONE - send one packet, request ACK, then wait for ACK 79 * RVT_S_ECN - a BECN was queued to the send engine 80 * RVT_S_MAX_BIT_MASK - The max bit that can be used by rdmavt 81 */ 82#define RVT_S_SIGNAL_REQ_WR 0x0001 83#define RVT_S_BUSY 0x0002 84#define RVT_S_TIMER 0x0004 85#define RVT_S_RESP_PENDING 0x0008 86#define RVT_S_ACK_PENDING 0x0010 87#define RVT_S_WAIT_FENCE 0x0020 88#define RVT_S_WAIT_RDMAR 0x0040 89#define RVT_S_WAIT_RNR 0x0080 90#define RVT_S_WAIT_SSN_CREDIT 0x0100 91#define RVT_S_WAIT_DMA 0x0200 92#define RVT_S_WAIT_PIO 0x0400 93#define RVT_S_WAIT_TX 0x0800 94#define RVT_S_WAIT_DMA_DESC 0x1000 95#define RVT_S_WAIT_KMEM 0x2000 96#define RVT_S_WAIT_PSN 0x4000 97#define RVT_S_WAIT_ACK 0x8000 98#define RVT_S_SEND_ONE 0x10000 99#define RVT_S_UNLIMITED_CREDIT 0x20000 100#define RVT_S_ECN 0x40000 101#define RVT_S_MAX_BIT_MASK 0x800000 102 103/* 104 * Drivers should use s_flags starting with bit 31 down to the bit next to 105 * RVT_S_MAX_BIT_MASK 106 */ 107 108/* 109 * Wait flags that would prevent any packet type from being sent. 110 */ 111#define RVT_S_ANY_WAIT_IO \ 112 (RVT_S_WAIT_PIO | RVT_S_WAIT_TX | \ 113 RVT_S_WAIT_DMA_DESC | RVT_S_WAIT_KMEM) 114 115/* 116 * Wait flags that would prevent send work requests from making progress. 117 */ 118#define RVT_S_ANY_WAIT_SEND (RVT_S_WAIT_FENCE | RVT_S_WAIT_RDMAR | \ 119 RVT_S_WAIT_RNR | RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_DMA | \ 120 RVT_S_WAIT_PSN | RVT_S_WAIT_ACK) 121 122#define RVT_S_ANY_WAIT (RVT_S_ANY_WAIT_IO | RVT_S_ANY_WAIT_SEND) 123 124/* Number of bits to pay attention to in the opcode for checking qp type */ 125#define RVT_OPCODE_QP_MASK 0xE0 126 127/* Flags for checking QP state (see ib_rvt_state_ops[]) */ 128#define RVT_POST_SEND_OK 0x01 129#define RVT_POST_RECV_OK 0x02 130#define RVT_PROCESS_RECV_OK 0x04 131#define RVT_PROCESS_SEND_OK 0x08 132#define RVT_PROCESS_NEXT_SEND_OK 0x10 133#define RVT_FLUSH_SEND 0x20 134#define RVT_FLUSH_RECV 0x40 135#define RVT_PROCESS_OR_FLUSH_SEND \ 136 (RVT_PROCESS_SEND_OK | RVT_FLUSH_SEND) 137#define RVT_SEND_OR_FLUSH_OR_RECV_OK \ 138 (RVT_PROCESS_SEND_OK | RVT_FLUSH_SEND | RVT_PROCESS_RECV_OK) 139 140/* 141 * Internal send flags 142 */ 143#define RVT_SEND_RESERVE_USED IB_SEND_RESERVED_START 144#define RVT_SEND_COMPLETION_ONLY (IB_SEND_RESERVED_START << 1) 145 146/** 147 * struct rvt_ud_wr - IB UD work plus AH cache 148 * @wr: valid IB work request 149 * @attr: pointer to an allocated AH attribute 150 * 151 * Special case the UD WR so we can keep track of the AH attributes. 152 * 153 * NOTE: This data structure is stricly ordered wr then attr. I.e the attr 154 * MUST come after wr. The ib_ud_wr is sized and copied in rvt_post_one_wr. 155 * The copy assumes that wr is first. 156 */ 157struct rvt_ud_wr { 158 struct ib_ud_wr wr; 159 struct rdma_ah_attr *attr; 160}; 161 162/* 163 * Send work request queue entry. 164 * The size of the sg_list is determined when the QP is created and stored 165 * in qp->s_max_sge. 166 */ 167struct rvt_swqe { 168 union { 169 struct ib_send_wr wr; /* don't use wr.sg_list */ 170 struct rvt_ud_wr ud_wr; 171 struct ib_reg_wr reg_wr; 172 struct ib_rdma_wr rdma_wr; 173 struct ib_atomic_wr atomic_wr; 174 }; 175 u32 psn; /* first packet sequence number */ 176 u32 lpsn; /* last packet sequence number */ 177 u32 ssn; /* send sequence number */ 178 u32 length; /* total length of data in sg_list */ 179 void *priv; /* driver dependent field */ 180 struct rvt_sge sg_list[]; 181}; 182 183/** 184 * struct rvt_krwq - kernel struct receive work request 185 * @p_lock: lock to protect producer of the kernel buffer 186 * @head: index of next entry to fill 187 * @c_lock: lock to protect consumer of the kernel buffer 188 * @tail: index of next entry to pull 189 * @count: count is approximate of total receive entries posted 190 * @curr_wq: struct of receive work request queue entry 191 * 192 * This structure is used to contain the head pointer, 193 * tail pointer and receive work queue entries for kernel 194 * mode user. 195 */ 196struct rvt_krwq { 197 spinlock_t p_lock; /* protect producer */ 198 u32 head; /* new work requests posted to the head */ 199 200 /* protect consumer */ 201 spinlock_t c_lock ____cacheline_aligned_in_smp; 202 u32 tail; /* receives pull requests from here. */ 203 u32 count; /* approx count of receive entries posted */ 204 struct rvt_rwqe *curr_wq; 205 struct rvt_rwqe wq[]; 206}; 207 208/* 209 * rvt_get_swqe_ah - Return the pointer to the struct rvt_ah 210 * @swqe: valid Send WQE 211 * 212 */ 213static inline struct rvt_ah *rvt_get_swqe_ah(struct rvt_swqe *swqe) 214{ 215 return ibah_to_rvtah(swqe->ud_wr.wr.ah); 216} 217 218/** 219 * rvt_get_swqe_ah_attr - Return the cached ah attribute information 220 * @swqe: valid Send WQE 221 * 222 */ 223static inline struct rdma_ah_attr *rvt_get_swqe_ah_attr(struct rvt_swqe *swqe) 224{ 225 return swqe->ud_wr.attr; 226} 227 228/** 229 * rvt_get_swqe_remote_qpn - Access the remote QPN value 230 * @swqe: valid Send WQE 231 * 232 */ 233static inline u32 rvt_get_swqe_remote_qpn(struct rvt_swqe *swqe) 234{ 235 return swqe->ud_wr.wr.remote_qpn; 236} 237 238/** 239 * rvt_get_swqe_remote_qkey - Acces the remote qkey value 240 * @swqe: valid Send WQE 241 * 242 */ 243static inline u32 rvt_get_swqe_remote_qkey(struct rvt_swqe *swqe) 244{ 245 return swqe->ud_wr.wr.remote_qkey; 246} 247 248/** 249 * rvt_get_swqe_pkey_index - Access the pkey index 250 * @swqe: valid Send WQE 251 * 252 */ 253static inline u16 rvt_get_swqe_pkey_index(struct rvt_swqe *swqe) 254{ 255 return swqe->ud_wr.wr.pkey_index; 256} 257 258struct rvt_rq { 259 struct rvt_rwq *wq; 260 struct rvt_krwq *kwq; 261 u32 size; /* size of RWQE array */ 262 u8 max_sge; 263 /* protect changes in this struct */ 264 spinlock_t lock ____cacheline_aligned_in_smp; 265}; 266 267/** 268 * rvt_get_rq_count - count numbers of request work queue entries 269 * in circular buffer 270 * @rq: data structure for request queue entry 271 * @head: head indices of the circular buffer 272 * @tail: tail indices of the circular buffer 273 * 274 * Return - total number of entries in the Receive Queue 275 */ 276 277static inline u32 rvt_get_rq_count(struct rvt_rq *rq, u32 head, u32 tail) 278{ 279 u32 count = head - tail; 280 281 if ((s32)count < 0) 282 count += rq->size; 283 return count; 284} 285 286/* 287 * This structure holds the information that the send tasklet needs 288 * to send a RDMA read response or atomic operation. 289 */ 290struct rvt_ack_entry { 291 struct rvt_sge rdma_sge; 292 u64 atomic_data; 293 u32 psn; 294 u32 lpsn; 295 u8 opcode; 296 u8 sent; 297 void *priv; 298}; 299 300#define RC_QP_SCALING_INTERVAL 5 301 302#define RVT_OPERATION_PRIV 0x00000001 303#define RVT_OPERATION_ATOMIC 0x00000002 304#define RVT_OPERATION_ATOMIC_SGE 0x00000004 305#define RVT_OPERATION_LOCAL 0x00000008 306#define RVT_OPERATION_USE_RESERVE 0x00000010 307#define RVT_OPERATION_IGN_RNR_CNT 0x00000020 308 309#define RVT_OPERATION_MAX (IB_WR_RESERVED10 + 1) 310 311/** 312 * struct rvt_operation_params - op table entry 313 * @length: the length to copy into the swqe entry 314 * @qpt_support: a bit mask indicating QP type support 315 * @flags: RVT_OPERATION flags (see above) 316 * 317 * This supports table driven post send so that 318 * the driver can have differing an potentially 319 * different sets of operations. 320 * 321 **/ 322 323struct rvt_operation_params { 324 size_t length; 325 u32 qpt_support; 326 u32 flags; 327}; 328 329/* 330 * Common variables are protected by both r_rq.lock and s_lock in that order 331 * which only happens in modify_qp() or changing the QP 'state'. 332 */ 333struct rvt_qp { 334 struct ib_qp ibqp; 335 void *priv; /* Driver private data */ 336 /* read mostly fields above and below */ 337 struct rdma_ah_attr remote_ah_attr; 338 struct rdma_ah_attr alt_ah_attr; 339 struct rvt_qp __rcu *next; /* link list for QPN hash table */ 340 struct rvt_swqe *s_wq; /* send work queue */ 341 struct rvt_mmap_info *ip; 342 343 unsigned long timeout_jiffies; /* computed from timeout */ 344 345 int srate_mbps; /* s_srate (below) converted to Mbit/s */ 346 pid_t pid; /* pid for user mode QPs */ 347 u32 remote_qpn; 348 u32 qkey; /* QKEY for this QP (for UD or RD) */ 349 u32 s_size; /* send work queue size */ 350 351 u16 pmtu; /* decoded from path_mtu */ 352 u8 log_pmtu; /* shift for pmtu */ 353 u8 state; /* QP state */ 354 u8 allowed_ops; /* high order bits of allowed opcodes */ 355 u8 qp_access_flags; 356 u8 alt_timeout; /* Alternate path timeout for this QP */ 357 u8 timeout; /* Timeout for this QP */ 358 u8 s_srate; 359 u8 s_mig_state; 360 u8 port_num; 361 u8 s_pkey_index; /* PKEY index to use */ 362 u8 s_alt_pkey_index; /* Alternate path PKEY index to use */ 363 u8 r_max_rd_atomic; /* max number of RDMA read/atomic to receive */ 364 u8 s_max_rd_atomic; /* max number of RDMA read/atomic to send */ 365 u8 s_retry_cnt; /* number of times to retry */ 366 u8 s_rnr_retry_cnt; 367 u8 r_min_rnr_timer; /* retry timeout value for RNR NAKs */ 368 u8 s_max_sge; /* size of s_wq->sg_list */ 369 u8 s_draining; 370 371 /* start of read/write fields */ 372 atomic_t refcount ____cacheline_aligned_in_smp; 373 wait_queue_head_t wait; 374 375 struct rvt_ack_entry *s_ack_queue; 376 struct rvt_sge_state s_rdma_read_sge; 377 378 spinlock_t r_lock ____cacheline_aligned_in_smp; /* used for APM */ 379 u32 r_psn; /* expected rcv packet sequence number */ 380 unsigned long r_aflags; 381 u64 r_wr_id; /* ID for current receive WQE */ 382 u32 r_ack_psn; /* PSN for next ACK or atomic ACK */ 383 u32 r_len; /* total length of r_sge */ 384 u32 r_rcv_len; /* receive data len processed */ 385 u32 r_msn; /* message sequence number */ 386 387 u8 r_state; /* opcode of last packet received */ 388 u8 r_flags; 389 u8 r_head_ack_queue; /* index into s_ack_queue[] */ 390 u8 r_adefered; /* defered ack count */ 391 392 struct list_head rspwait; /* link for waiting to respond */ 393 394 struct rvt_sge_state r_sge; /* current receive data */ 395 struct rvt_rq r_rq; /* receive work queue */ 396 397 /* post send line */ 398 spinlock_t s_hlock ____cacheline_aligned_in_smp; 399 u32 s_head; /* new entries added here */ 400 u32 s_next_psn; /* PSN for next request */ 401 u32 s_avail; /* number of entries avail */ 402 u32 s_ssn; /* SSN of tail entry */ 403 atomic_t s_reserved_used; /* reserved entries in use */ 404 405 spinlock_t s_lock ____cacheline_aligned_in_smp; 406 u32 s_flags; 407 struct rvt_sge_state *s_cur_sge; 408 struct rvt_swqe *s_wqe; 409 struct rvt_sge_state s_sge; /* current send request data */ 410 struct rvt_mregion *s_rdma_mr; 411 u32 s_len; /* total length of s_sge */ 412 u32 s_rdma_read_len; /* total length of s_rdma_read_sge */ 413 u32 s_last_psn; /* last response PSN processed */ 414 u32 s_sending_psn; /* lowest PSN that is being sent */ 415 u32 s_sending_hpsn; /* highest PSN that is being sent */ 416 u32 s_psn; /* current packet sequence number */ 417 u32 s_ack_rdma_psn; /* PSN for sending RDMA read responses */ 418 u32 s_ack_psn; /* PSN for acking sends and RDMA writes */ 419 u32 s_tail; /* next entry to process */ 420 u32 s_cur; /* current work queue entry */ 421 u32 s_acked; /* last un-ACK'ed entry */ 422 u32 s_last; /* last completed entry */ 423 u32 s_lsn; /* limit sequence number (credit) */ 424 u32 s_ahgpsn; /* set to the psn in the copy of the header */ 425 u16 s_cur_size; /* size of send packet in bytes */ 426 u16 s_rdma_ack_cnt; 427 u8 s_hdrwords; /* size of s_hdr in 32 bit words */ 428 s8 s_ahgidx; 429 u8 s_state; /* opcode of last packet sent */ 430 u8 s_ack_state; /* opcode of packet to ACK */ 431 u8 s_nak_state; /* non-zero if NAK is pending */ 432 u8 r_nak_state; /* non-zero if NAK is pending */ 433 u8 s_retry; /* requester retry counter */ 434 u8 s_rnr_retry; /* requester RNR retry counter */ 435 u8 s_num_rd_atomic; /* number of RDMA read/atomic pending */ 436 u8 s_tail_ack_queue; /* index into s_ack_queue[] */ 437 u8 s_acked_ack_queue; /* index into s_ack_queue[] */ 438 439 struct rvt_sge_state s_ack_rdma_sge; 440 struct timer_list s_timer; 441 struct hrtimer s_rnr_timer; 442 443 atomic_t local_ops_pending; /* number of fast_reg/local_inv reqs */ 444 445 /* 446 * This sge list MUST be last. Do not add anything below here. 447 */ 448 struct rvt_sge *r_sg_list /* verified SGEs */ 449 ____cacheline_aligned_in_smp; 450}; 451 452struct rvt_srq { 453 struct ib_srq ibsrq; 454 struct rvt_rq rq; 455 struct rvt_mmap_info *ip; 456 /* send signal when number of RWQEs < limit */ 457 u32 limit; 458}; 459 460static inline struct rvt_srq *ibsrq_to_rvtsrq(struct ib_srq *ibsrq) 461{ 462 return container_of(ibsrq, struct rvt_srq, ibsrq); 463} 464 465static inline struct rvt_qp *ibqp_to_rvtqp(struct ib_qp *ibqp) 466{ 467 return container_of(ibqp, struct rvt_qp, ibqp); 468} 469 470#define RVT_QPN_MAX BIT(24) 471#define RVT_QPNMAP_ENTRIES (RVT_QPN_MAX / PAGE_SIZE / BITS_PER_BYTE) 472#define RVT_BITS_PER_PAGE (PAGE_SIZE * BITS_PER_BYTE) 473#define RVT_BITS_PER_PAGE_MASK (RVT_BITS_PER_PAGE - 1) 474#define RVT_QPN_MASK IB_QPN_MASK 475 476/* 477 * QPN-map pages start out as NULL, they get allocated upon 478 * first use and are never deallocated. This way, 479 * large bitmaps are not allocated unless large numbers of QPs are used. 480 */ 481struct rvt_qpn_map { 482 void *page; 483}; 484 485struct rvt_qpn_table { 486 spinlock_t lock; /* protect changes to the qp table */ 487 unsigned flags; /* flags for QP0/1 allocated for each port */ 488 u32 last; /* last QP number allocated */ 489 u32 nmaps; /* size of the map table */ 490 u16 limit; 491 u8 incr; 492 /* bit map of free QP numbers other than 0/1 */ 493 struct rvt_qpn_map map[RVT_QPNMAP_ENTRIES]; 494}; 495 496struct rvt_qp_ibdev { 497 u32 qp_table_size; 498 u32 qp_table_bits; 499 struct rvt_qp __rcu **qp_table; 500 spinlock_t qpt_lock; /* qptable lock */ 501 struct rvt_qpn_table qpn_table; 502}; 503 504/* 505 * There is one struct rvt_mcast for each multicast GID. 506 * All attached QPs are then stored as a list of 507 * struct rvt_mcast_qp. 508 */ 509struct rvt_mcast_qp { 510 struct list_head list; 511 struct rvt_qp *qp; 512}; 513 514struct rvt_mcast_addr { 515 union ib_gid mgid; 516 u16 lid; 517}; 518 519struct rvt_mcast { 520 struct rb_node rb_node; 521 struct rvt_mcast_addr mcast_addr; 522 struct list_head qp_list; 523 wait_queue_head_t wait; 524 atomic_t refcount; 525 int n_attached; 526}; 527 528/* 529 * Since struct rvt_swqe is not a fixed size, we can't simply index into 530 * struct rvt_qp.s_wq. This function does the array index computation. 531 */ 532static inline struct rvt_swqe *rvt_get_swqe_ptr(struct rvt_qp *qp, 533 unsigned n) 534{ 535 return (struct rvt_swqe *)((char *)qp->s_wq + 536 (sizeof(struct rvt_swqe) + 537 qp->s_max_sge * 538 sizeof(struct rvt_sge)) * n); 539} 540 541/* 542 * Since struct rvt_rwqe is not a fixed size, we can't simply index into 543 * struct rvt_rwq.wq. This function does the array index computation. 544 */ 545static inline struct rvt_rwqe *rvt_get_rwqe_ptr(struct rvt_rq *rq, unsigned n) 546{ 547 return (struct rvt_rwqe *) 548 ((char *)rq->kwq->curr_wq + 549 (sizeof(struct rvt_rwqe) + 550 rq->max_sge * sizeof(struct ib_sge)) * n); 551} 552 553/** 554 * rvt_is_user_qp - return if this is user mode QP 555 * @qp: the target QP 556 */ 557static inline bool rvt_is_user_qp(struct rvt_qp *qp) 558{ 559 return !!qp->pid; 560} 561 562/** 563 * rvt_get_qp - get a QP reference 564 * @qp: the QP to hold 565 */ 566static inline void rvt_get_qp(struct rvt_qp *qp) 567{ 568 atomic_inc(&qp->refcount); 569} 570 571/** 572 * rvt_put_qp - release a QP reference 573 * @qp: the QP to release 574 */ 575static inline void rvt_put_qp(struct rvt_qp *qp) 576{ 577 if (qp && atomic_dec_and_test(&qp->refcount)) 578 wake_up(&qp->wait); 579} 580 581/** 582 * rvt_put_swqe - drop mr refs held by swqe 583 * @wqe: the send wqe 584 * 585 * This drops any mr references held by the swqe 586 */ 587static inline void rvt_put_swqe(struct rvt_swqe *wqe) 588{ 589 int i; 590 591 for (i = 0; i < wqe->wr.num_sge; i++) { 592 struct rvt_sge *sge = &wqe->sg_list[i]; 593 594 rvt_put_mr(sge->mr); 595 } 596} 597 598/** 599 * rvt_qp_wqe_reserve - reserve operation 600 * @qp: the rvt qp 601 * @wqe: the send wqe 602 * 603 * This routine used in post send to record 604 * a wqe relative reserved operation use. 605 */ 606static inline void rvt_qp_wqe_reserve( 607 struct rvt_qp *qp, 608 struct rvt_swqe *wqe) 609{ 610 atomic_inc(&qp->s_reserved_used); 611} 612 613/** 614 * rvt_qp_wqe_unreserve - clean reserved operation 615 * @qp: the rvt qp 616 * @flags: send wqe flags 617 * 618 * This decrements the reserve use count. 619 * 620 * This call MUST precede the change to 621 * s_last to insure that post send sees a stable 622 * s_avail. 623 * 624 * An smp_mp__after_atomic() is used to insure 625 * the compiler does not juggle the order of the s_last 626 * ring index and the decrementing of s_reserved_used. 627 */ 628static inline void rvt_qp_wqe_unreserve(struct rvt_qp *qp, int flags) 629{ 630 if (unlikely(flags & RVT_SEND_RESERVE_USED)) { 631 atomic_dec(&qp->s_reserved_used); 632 /* insure no compiler re-order up to s_last change */ 633 smp_mb__after_atomic(); 634 } 635} 636 637extern const enum ib_wc_opcode ib_rvt_wc_opcode[]; 638 639/* 640 * Compare the lower 24 bits of the msn values. 641 * Returns an integer <, ==, or > than zero. 642 */ 643static inline int rvt_cmp_msn(u32 a, u32 b) 644{ 645 return (((int)a) - ((int)b)) << 8; 646} 647 648__be32 rvt_compute_aeth(struct rvt_qp *qp); 649 650void rvt_get_credit(struct rvt_qp *qp, u32 aeth); 651 652u32 rvt_restart_sge(struct rvt_sge_state *ss, struct rvt_swqe *wqe, u32 len); 653 654/** 655 * rvt_div_round_up_mtu - round up divide 656 * @qp: the qp pair 657 * @len: the length 658 * 659 * Perform a shift based mtu round up divide 660 */ 661static inline u32 rvt_div_round_up_mtu(struct rvt_qp *qp, u32 len) 662{ 663 return (len + qp->pmtu - 1) >> qp->log_pmtu; 664} 665 666/** 667 * rvt_div_mtu - shift-based divide 668 * @qp: the qp pair 669 * @len: the length 670 * 671 * Perform a shift based mtu divide 672 */ 673static inline u32 rvt_div_mtu(struct rvt_qp *qp, u32 len) 674{ 675 return len >> qp->log_pmtu; 676} 677 678/** 679 * rvt_timeout_to_jiffies - Convert a ULP timeout input into jiffies 680 * @timeout: timeout input(0 - 31). 681 * 682 * Return a timeout value in jiffies. 683 */ 684static inline unsigned long rvt_timeout_to_jiffies(u8 timeout) 685{ 686 if (timeout > 31) 687 timeout = 31; 688 689 return usecs_to_jiffies(1U << timeout) * 4096UL / 1000UL; 690} 691 692/** 693 * rvt_lookup_qpn - return the QP with the given QPN 694 * @rdi: rvt device info structure 695 * @rvp: the ibport 696 * @qpn: the QP number to look up 697 * 698 * The caller must hold the rcu_read_lock(), and keep the lock until 699 * the returned qp is no longer in use. 700 */ 701static inline struct rvt_qp *rvt_lookup_qpn(struct rvt_dev_info *rdi, 702 struct rvt_ibport *rvp, 703 u32 qpn) __must_hold(RCU) 704{ 705 struct rvt_qp *qp = NULL; 706 707 if (unlikely(qpn <= 1)) { 708 qp = rcu_dereference(rvp->qp[qpn]); 709 } else { 710 u32 n = hash_32(qpn, rdi->qp_dev->qp_table_bits); 711 712 for (qp = rcu_dereference(rdi->qp_dev->qp_table[n]); qp; 713 qp = rcu_dereference(qp->next)) 714 if (qp->ibqp.qp_num == qpn) 715 break; 716 } 717 return qp; 718} 719 720/** 721 * rvt_mod_retry_timer_ext - mod a retry timer 722 * @qp: the QP 723 * @shift: timeout shift to wait for multiple packets 724 * Modify a potentially already running retry timer 725 */ 726static inline void rvt_mod_retry_timer_ext(struct rvt_qp *qp, u8 shift) 727{ 728 struct ib_qp *ibqp = &qp->ibqp; 729 struct rvt_dev_info *rdi = ib_to_rvt(ibqp->device); 730 731 lockdep_assert_held(&qp->s_lock); 732 qp->s_flags |= RVT_S_TIMER; 733 /* 4.096 usec. * (1 << qp->timeout) */ 734 mod_timer(&qp->s_timer, jiffies + rdi->busy_jiffies + 735 (qp->timeout_jiffies << shift)); 736} 737 738static inline void rvt_mod_retry_timer(struct rvt_qp *qp) 739{ 740 return rvt_mod_retry_timer_ext(qp, 0); 741} 742 743/** 744 * rvt_put_qp_swqe - drop refs held by swqe 745 * @qp: the send qp 746 * @wqe: the send wqe 747 * 748 * This drops any references held by the swqe 749 */ 750static inline void rvt_put_qp_swqe(struct rvt_qp *qp, struct rvt_swqe *wqe) 751{ 752 rvt_put_swqe(wqe); 753 if (qp->allowed_ops == IB_OPCODE_UD) 754 rdma_destroy_ah_attr(wqe->ud_wr.attr); 755} 756 757/** 758 * rvt_qp_swqe_incr - increment ring index 759 * @qp: the qp 760 * @val: the starting value 761 * 762 * Return: the new value wrapping as appropriate 763 */ 764static inline u32 765rvt_qp_swqe_incr(struct rvt_qp *qp, u32 val) 766{ 767 if (++val >= qp->s_size) 768 val = 0; 769 return val; 770} 771 772int rvt_error_qp(struct rvt_qp *qp, enum ib_wc_status err); 773 774/** 775 * rvt_recv_cq - add a new entry to completion queue 776 * by receive queue 777 * @qp: receive queue 778 * @wc: work completion entry to add 779 * @solicited: true if @entry is solicited 780 * 781 * This is wrapper function for rvt_enter_cq function call by 782 * receive queue. If rvt_cq_enter return false, it means cq is 783 * full and the qp is put into error state. 784 */ 785static inline void rvt_recv_cq(struct rvt_qp *qp, struct ib_wc *wc, 786 bool solicited) 787{ 788 struct rvt_cq *cq = ibcq_to_rvtcq(qp->ibqp.recv_cq); 789 790 if (unlikely(!rvt_cq_enter(cq, wc, solicited))) 791 rvt_error_qp(qp, IB_WC_LOC_QP_OP_ERR); 792} 793 794/** 795 * rvt_send_cq - add a new entry to completion queue 796 * by send queue 797 * @qp: send queue 798 * @wc: work completion entry to add 799 * @solicited: true if @entry is solicited 800 * 801 * This is wrapper function for rvt_enter_cq function call by 802 * send queue. If rvt_cq_enter return false, it means cq is 803 * full and the qp is put into error state. 804 */ 805static inline void rvt_send_cq(struct rvt_qp *qp, struct ib_wc *wc, 806 bool solicited) 807{ 808 struct rvt_cq *cq = ibcq_to_rvtcq(qp->ibqp.send_cq); 809 810 if (unlikely(!rvt_cq_enter(cq, wc, solicited))) 811 rvt_error_qp(qp, IB_WC_LOC_QP_OP_ERR); 812} 813 814/** 815 * rvt_qp_complete_swqe - insert send completion 816 * @qp: the qp 817 * @wqe: the send wqe 818 * @opcode: wc operation (driver dependent) 819 * @status: completion status 820 * 821 * Update the s_last information, and then insert a send 822 * completion into the completion 823 * queue if the qp indicates it should be done. 824 * 825 * See IBTA 10.7.3.1 for info on completion 826 * control. 827 * 828 * Return: new last 829 */ 830static inline u32 831rvt_qp_complete_swqe(struct rvt_qp *qp, 832 struct rvt_swqe *wqe, 833 enum ib_wc_opcode opcode, 834 enum ib_wc_status status) 835{ 836 bool need_completion; 837 u64 wr_id; 838 u32 byte_len, last; 839 int flags = wqe->wr.send_flags; 840 841 rvt_qp_wqe_unreserve(qp, flags); 842 rvt_put_qp_swqe(qp, wqe); 843 844 need_completion = 845 !(flags & RVT_SEND_RESERVE_USED) && 846 (!(qp->s_flags & RVT_S_SIGNAL_REQ_WR) || 847 (flags & IB_SEND_SIGNALED) || 848 status != IB_WC_SUCCESS); 849 if (need_completion) { 850 wr_id = wqe->wr.wr_id; 851 byte_len = wqe->length; 852 /* above fields required before writing s_last */ 853 } 854 last = rvt_qp_swqe_incr(qp, qp->s_last); 855 /* see rvt_qp_is_avail() */ 856 smp_store_release(&qp->s_last, last); 857 if (need_completion) { 858 struct ib_wc w = { 859 .wr_id = wr_id, 860 .status = status, 861 .opcode = opcode, 862 .qp = &qp->ibqp, 863 .byte_len = byte_len, 864 }; 865 rvt_send_cq(qp, &w, status != IB_WC_SUCCESS); 866 } 867 return last; 868} 869 870extern const int ib_rvt_state_ops[]; 871 872struct rvt_dev_info; 873int rvt_get_rwqe(struct rvt_qp *qp, bool wr_id_only); 874void rvt_comm_est(struct rvt_qp *qp); 875void rvt_rc_error(struct rvt_qp *qp, enum ib_wc_status err); 876unsigned long rvt_rnr_tbl_to_usec(u32 index); 877enum hrtimer_restart rvt_rc_rnr_retry(struct hrtimer *t); 878void rvt_add_rnr_timer(struct rvt_qp *qp, u32 aeth); 879void rvt_del_timers_sync(struct rvt_qp *qp); 880void rvt_stop_rc_timers(struct rvt_qp *qp); 881void rvt_add_retry_timer_ext(struct rvt_qp *qp, u8 shift); 882static inline void rvt_add_retry_timer(struct rvt_qp *qp) 883{ 884 rvt_add_retry_timer_ext(qp, 0); 885} 886 887void rvt_copy_sge(struct rvt_qp *qp, struct rvt_sge_state *ss, 888 void *data, u32 length, 889 bool release, bool copy_last); 890void rvt_send_complete(struct rvt_qp *qp, struct rvt_swqe *wqe, 891 enum ib_wc_status status); 892void rvt_ruc_loopback(struct rvt_qp *qp); 893 894/** 895 * struct rvt_qp_iter - the iterator for QPs 896 * @qp: the current QP 897 * 898 * This structure defines the current iterator 899 * state for sequenced access to all QPs relative 900 * to an rvt_dev_info. 901 */ 902struct rvt_qp_iter { 903 struct rvt_qp *qp; 904 /* private: backpointer */ 905 struct rvt_dev_info *rdi; 906 /* private: callback routine */ 907 void (*cb)(struct rvt_qp *qp, u64 v); 908 /* private: for arg to callback routine */ 909 u64 v; 910 /* private: number of SMI,GSI QPs for device */ 911 int specials; 912 /* private: current iterator index */ 913 int n; 914}; 915 916/** 917 * ib_cq_tail - Return tail index of cq buffer 918 * @send_cq: The cq for send 919 * 920 * This is called in qp_iter_print to get tail 921 * of cq buffer. 922 */ 923static inline u32 ib_cq_tail(struct ib_cq *send_cq) 924{ 925 struct rvt_cq *cq = ibcq_to_rvtcq(send_cq); 926 927 return ibcq_to_rvtcq(send_cq)->ip ? 928 RDMA_READ_UAPI_ATOMIC(cq->queue->tail) : 929 ibcq_to_rvtcq(send_cq)->kqueue->tail; 930} 931 932/** 933 * ib_cq_head - Return head index of cq buffer 934 * @send_cq: The cq for send 935 * 936 * This is called in qp_iter_print to get head 937 * of cq buffer. 938 */ 939static inline u32 ib_cq_head(struct ib_cq *send_cq) 940{ 941 struct rvt_cq *cq = ibcq_to_rvtcq(send_cq); 942 943 return ibcq_to_rvtcq(send_cq)->ip ? 944 RDMA_READ_UAPI_ATOMIC(cq->queue->head) : 945 ibcq_to_rvtcq(send_cq)->kqueue->head; 946} 947 948/** 949 * rvt_free_rq - free memory allocated for rvt_rq struct 950 * @rq: request queue data structure 951 * 952 * This function should only be called if the rvt_mmap_info() 953 * has not succeeded. 954 */ 955static inline void rvt_free_rq(struct rvt_rq *rq) 956{ 957 kvfree(rq->kwq); 958 rq->kwq = NULL; 959 vfree(rq->wq); 960 rq->wq = NULL; 961} 962 963/** 964 * rvt_to_iport - Get the ibport pointer 965 * @qp: the qp pointer 966 * 967 * This function returns the ibport pointer from the qp pointer. 968 */ 969static inline struct rvt_ibport *rvt_to_iport(struct rvt_qp *qp) 970{ 971 struct rvt_dev_info *rdi = ib_to_rvt(qp->ibqp.device); 972 973 return rdi->ports[qp->port_num - 1]; 974} 975 976/** 977 * rvt_rc_credit_avail - Check if there are enough RC credits for the request 978 * @qp: the qp 979 * @wqe: the request 980 * 981 * This function returns false when there are not enough credits for the given 982 * request and true otherwise. 983 */ 984static inline bool rvt_rc_credit_avail(struct rvt_qp *qp, struct rvt_swqe *wqe) 985{ 986 lockdep_assert_held(&qp->s_lock); 987 if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) && 988 rvt_cmp_msn(wqe->ssn, qp->s_lsn + 1) > 0) { 989 struct rvt_ibport *rvp = rvt_to_iport(qp); 990 991 qp->s_flags |= RVT_S_WAIT_SSN_CREDIT; 992 rvp->n_rc_crwaits++; 993 return false; 994 } 995 return true; 996} 997 998struct rvt_qp_iter *rvt_qp_iter_init(struct rvt_dev_info *rdi, 999 u64 v, 1000 void (*cb)(struct rvt_qp *qp, u64 v)); 1001int rvt_qp_iter_next(struct rvt_qp_iter *iter); 1002void rvt_qp_iter(struct rvt_dev_info *rdi, 1003 u64 v, 1004 void (*cb)(struct rvt_qp *qp, u64 v)); 1005void rvt_qp_mr_clean(struct rvt_qp *qp, u32 lkey); 1006#endif /* DEF_RDMAVT_INCQP_H */
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