// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
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/* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
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/* Copyright (c) 2008-2019, IBM Corporation */
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <rdma/ib_verbs.h>
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#include "siw.h"
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static int map_wc_opcode[SIW_NUM_OPCODES] = {
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[SIW_OP_WRITE] = IB_WC_RDMA_WRITE,
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[SIW_OP_SEND] = IB_WC_SEND,
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[SIW_OP_SEND_WITH_IMM] = IB_WC_SEND,
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[SIW_OP_READ] = IB_WC_RDMA_READ,
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[SIW_OP_READ_LOCAL_INV] = IB_WC_RDMA_READ,
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[SIW_OP_COMP_AND_SWAP] = IB_WC_COMP_SWAP,
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[SIW_OP_FETCH_AND_ADD] = IB_WC_FETCH_ADD,
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[SIW_OP_INVAL_STAG] = IB_WC_LOCAL_INV,
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[SIW_OP_REG_MR] = IB_WC_REG_MR,
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[SIW_OP_RECEIVE] = IB_WC_RECV,
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[SIW_OP_READ_RESPONSE] = -1 /* not used */
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};
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static struct {
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enum siw_wc_status siw;
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enum ib_wc_status ib;
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} map_cqe_status[SIW_NUM_WC_STATUS] = {
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{ SIW_WC_SUCCESS, IB_WC_SUCCESS },
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{ SIW_WC_LOC_LEN_ERR, IB_WC_LOC_LEN_ERR },
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{ SIW_WC_LOC_PROT_ERR, IB_WC_LOC_PROT_ERR },
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{ SIW_WC_LOC_QP_OP_ERR, IB_WC_LOC_QP_OP_ERR },
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{ SIW_WC_WR_FLUSH_ERR, IB_WC_WR_FLUSH_ERR },
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{ SIW_WC_BAD_RESP_ERR, IB_WC_BAD_RESP_ERR },
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{ SIW_WC_LOC_ACCESS_ERR, IB_WC_LOC_ACCESS_ERR },
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{ SIW_WC_REM_ACCESS_ERR, IB_WC_REM_ACCESS_ERR },
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{ SIW_WC_REM_INV_REQ_ERR, IB_WC_REM_INV_REQ_ERR },
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{ SIW_WC_GENERAL_ERR, IB_WC_GENERAL_ERR }
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};
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/*
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* Reap one CQE from the CQ. Only used by kernel clients
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* during CQ normal operation. Might be called during CQ
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* flush for user mapped CQE array as well.
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*/
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int siw_reap_cqe(struct siw_cq *cq, struct ib_wc *wc)
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{
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struct siw_cqe *cqe;
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unsigned long flags;
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spin_lock_irqsave(&cq->lock, flags);
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cqe = &cq->queue[cq->cq_get % cq->num_cqe];
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if (READ_ONCE(cqe->flags) & SIW_WQE_VALID) {
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memset(wc, 0, sizeof(*wc));
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wc->wr_id = cqe->id;
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wc->byte_len = cqe->bytes;
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/*
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* During CQ flush, also user land CQE's may get
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* reaped here, which do not hold a QP reference
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* and do not qualify for memory extension verbs.
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*/
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if (likely(rdma_is_kernel_res(&cq->base_cq.res))) {
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if (cqe->flags & SIW_WQE_REM_INVAL) {
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wc->ex.invalidate_rkey = cqe->inval_stag;
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wc->wc_flags = IB_WC_WITH_INVALIDATE;
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}
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wc->qp = cqe->base_qp;
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wc->opcode = map_wc_opcode[cqe->opcode];
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wc->status = map_cqe_status[cqe->status].ib;
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siw_dbg_cq(cq,
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"idx %u, type %d, flags %2x, id 0x%pK\n",
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cq->cq_get % cq->num_cqe, cqe->opcode,
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cqe->flags, (void *)(uintptr_t)cqe->id);
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} else {
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/*
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* A malicious user may set invalid opcode or
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* status in the user mmapped CQE array.
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* Sanity check and correct values in that case
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* to avoid out-of-bounds access to global arrays
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* for opcode and status mapping.
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*/
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u8 opcode = cqe->opcode;
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u16 status = cqe->status;
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if (opcode >= SIW_NUM_OPCODES) {
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opcode = 0;
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status = SIW_WC_GENERAL_ERR;
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} else if (status >= SIW_NUM_WC_STATUS) {
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status = SIW_WC_GENERAL_ERR;
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}
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wc->opcode = map_wc_opcode[opcode];
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wc->status = map_cqe_status[status].ib;
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}
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WRITE_ONCE(cqe->flags, 0);
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cq->cq_get++;
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spin_unlock_irqrestore(&cq->lock, flags);
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return 1;
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}
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spin_unlock_irqrestore(&cq->lock, flags);
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return 0;
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}
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/*
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* siw_cq_flush()
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*
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* Flush all CQ elements.
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*/
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void siw_cq_flush(struct siw_cq *cq)
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{
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struct ib_wc wc;
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while (siw_reap_cqe(cq, &wc))
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;
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}
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