1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause 2 3 /* Authors: Bernard Metzler <bmt@zurich.ibm.com> */ 4 /* Copyright (c) 2008-2019, IBM Corporation */ 5 6 #include <linux/errno.h> 7 #include <linux/types.h> 8 9 #include <rdma/ib_verbs.h> 10 11 #include "siw.h" 12 13 static int map_wc_opcode[SIW_NUM_OPCODES] = { 14 [SIW_OP_WRITE] = IB_WC_RDMA_WRITE, 15 [SIW_OP_SEND] = IB_WC_SEND, 16 [SIW_OP_SEND_WITH_IMM] = IB_WC_SEND, 17 [SIW_OP_READ] = IB_WC_RDMA_READ, 18 [SIW_OP_READ_LOCAL_INV] = IB_WC_RDMA_READ, 19 [SIW_OP_COMP_AND_SWAP] = IB_WC_COMP_SWAP, 20 [SIW_OP_FETCH_AND_ADD] = IB_WC_FETCH_ADD, 21 [SIW_OP_INVAL_STAG] = IB_WC_LOCAL_INV, 22 [SIW_OP_REG_MR] = IB_WC_REG_MR, 23 [SIW_OP_RECEIVE] = IB_WC_RECV, 24 [SIW_OP_READ_RESPONSE] = -1 /* not used */ 25 }; 26 27 static struct { 28 enum siw_wc_status siw; 29 enum ib_wc_status ib; 30 } map_cqe_status[SIW_NUM_WC_STATUS] = { 31 { SIW_WC_SUCCESS, IB_WC_SUCCESS }, 32 { SIW_WC_LOC_LEN_ERR, IB_WC_LOC_LEN_ERR }, 33 { SIW_WC_LOC_PROT_ERR, IB_WC_LOC_PROT_ERR }, 34 { SIW_WC_LOC_QP_OP_ERR, IB_WC_LOC_QP_OP_ERR }, 35 { SIW_WC_WR_FLUSH_ERR, IB_WC_WR_FLUSH_ERR }, 36 { SIW_WC_BAD_RESP_ERR, IB_WC_BAD_RESP_ERR }, 37 { SIW_WC_LOC_ACCESS_ERR, IB_WC_LOC_ACCESS_ERR }, 38 { SIW_WC_REM_ACCESS_ERR, IB_WC_REM_ACCESS_ERR }, 39 { SIW_WC_REM_INV_REQ_ERR, IB_WC_REM_INV_REQ_ERR }, 40 { SIW_WC_GENERAL_ERR, IB_WC_GENERAL_ERR } 41 }; 42 43 /* 44 * Reap one CQE from the CQ. Only used by kernel clients 45 * during CQ normal operation. Might be called during CQ 46 * flush for user mapped CQE array as well. 47 */ 48 int siw_reap_cqe(struct siw_cq *cq, struct ib_wc *wc) 49 { 50 struct siw_cqe *cqe; 51 unsigned long flags; 52 53 spin_lock_irqsave(&cq->lock, flags); 54 55 cqe = &cq->queue[cq->cq_get % cq->num_cqe]; 56 if (READ_ONCE(cqe->flags) & SIW_WQE_VALID) { 57 memset(wc, 0, sizeof(*wc)); 58 wc->wr_id = cqe->id; 59 wc->status = map_cqe_status[cqe->status].ib; 60 wc->opcode = map_wc_opcode[cqe->opcode]; 61 wc->byte_len = cqe->bytes; 62 63 /* 64 * During CQ flush, also user land CQE's may get 65 * reaped here, which do not hold a QP reference 66 * and do not qualify for memory extension verbs. 67 */ 68 if (likely(rdma_is_kernel_res(&cq->base_cq.res))) { 69 if (cqe->flags & SIW_WQE_REM_INVAL) { 70 wc->ex.invalidate_rkey = cqe->inval_stag; 71 wc->wc_flags = IB_WC_WITH_INVALIDATE; 72 } 73 wc->qp = cqe->base_qp; 74 siw_dbg_cq(cq, 75 "idx %u, type %d, flags %2x, id 0x%pK\n", 76 cq->cq_get % cq->num_cqe, cqe->opcode, 77 cqe->flags, (void *)(uintptr_t)cqe->id); 78 } 79 WRITE_ONCE(cqe->flags, 0); 80 cq->cq_get++; 81 82 spin_unlock_irqrestore(&cq->lock, flags); 83 84 return 1; 85 } 86 spin_unlock_irqrestore(&cq->lock, flags); 87 88 return 0; 89 } 90 91 /* 92 * siw_cq_flush() 93 * 94 * Flush all CQ elements. 95 */ 96 void siw_cq_flush(struct siw_cq *cq) 97 { 98 struct ib_wc wc; 99 100 while (siw_reap_cqe(cq, &wc)) 101 ; 102 } 103