From b0fff7317bb4325ace221a24c4bfa274f0046ee4 Mon Sep 17 00:00:00 2001 From: Bernard Metzler Date: Thu, 20 Jun 2019 18:21:32 +0200 Subject: rdma/siw: completion queue methods Broken up commit to add the Soft iWarp RDMA driver. Signed-off-by: Bernard Metzler Signed-off-by: Jason Gunthorpe --- drivers/infiniband/sw/siw/siw_cq.c | 101 +++++++++++++++++++++++++++++++++++++ 1 file changed, 101 insertions(+) create mode 100644 drivers/infiniband/sw/siw/siw_cq.c (limited to 'drivers/infiniband/sw') diff --git a/drivers/infiniband/sw/siw/siw_cq.c b/drivers/infiniband/sw/siw/siw_cq.c new file mode 100644 index 000000000000..e2a0ee40d5b5 --- /dev/null +++ b/drivers/infiniband/sw/siw/siw_cq.c @@ -0,0 +1,101 @@ +// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause + +/* Authors: Bernard Metzler */ +/* Copyright (c) 2008-2019, IBM Corporation */ + +#include +#include + +#include + +#include "siw.h" + +static int map_wc_opcode[SIW_NUM_OPCODES] = { + [SIW_OP_WRITE] = IB_WC_RDMA_WRITE, + [SIW_OP_SEND] = IB_WC_SEND, + [SIW_OP_SEND_WITH_IMM] = IB_WC_SEND, + [SIW_OP_READ] = IB_WC_RDMA_READ, + [SIW_OP_READ_LOCAL_INV] = IB_WC_RDMA_READ, + [SIW_OP_COMP_AND_SWAP] = IB_WC_COMP_SWAP, + [SIW_OP_FETCH_AND_ADD] = IB_WC_FETCH_ADD, + [SIW_OP_INVAL_STAG] = IB_WC_LOCAL_INV, + [SIW_OP_REG_MR] = IB_WC_REG_MR, + [SIW_OP_RECEIVE] = IB_WC_RECV, + [SIW_OP_READ_RESPONSE] = -1 /* not used */ +}; + +static struct { + enum siw_opcode siw; + enum ib_wc_status ib; +} map_cqe_status[SIW_NUM_WC_STATUS] = { + { SIW_WC_SUCCESS, IB_WC_SUCCESS }, + { SIW_WC_LOC_LEN_ERR, IB_WC_LOC_LEN_ERR }, + { SIW_WC_LOC_PROT_ERR, IB_WC_LOC_PROT_ERR }, + { SIW_WC_LOC_QP_OP_ERR, IB_WC_LOC_QP_OP_ERR }, + { SIW_WC_WR_FLUSH_ERR, IB_WC_WR_FLUSH_ERR }, + { SIW_WC_BAD_RESP_ERR, IB_WC_BAD_RESP_ERR }, + { SIW_WC_LOC_ACCESS_ERR, IB_WC_LOC_ACCESS_ERR }, + { SIW_WC_REM_ACCESS_ERR, IB_WC_REM_ACCESS_ERR }, + { SIW_WC_REM_INV_REQ_ERR, IB_WC_REM_INV_REQ_ERR }, + { SIW_WC_GENERAL_ERR, IB_WC_GENERAL_ERR } +}; + +/* + * Reap one CQE from the CQ. Only used by kernel clients + * during CQ normal operation. Might be called during CQ + * flush for user mapped CQE array as well. + */ +int siw_reap_cqe(struct siw_cq *cq, struct ib_wc *wc) +{ + struct siw_cqe *cqe; + unsigned long flags; + + spin_lock_irqsave(&cq->lock, flags); + + cqe = &cq->queue[cq->cq_get % cq->num_cqe]; + if (READ_ONCE(cqe->flags) & SIW_WQE_VALID) { + memset(wc, 0, sizeof(*wc)); + wc->wr_id = cqe->id; + wc->status = map_cqe_status[cqe->status].ib; + wc->opcode = map_wc_opcode[cqe->opcode]; + wc->byte_len = cqe->bytes; + + /* + * During CQ flush, also user land CQE's may get + * reaped here, which do not hold a QP reference + * and do not qualify for memory extension verbs. + */ + if (likely(cq->kernel_verbs)) { + if (cqe->flags & SIW_WQE_REM_INVAL) { + wc->ex.invalidate_rkey = cqe->inval_stag; + wc->wc_flags = IB_WC_WITH_INVALIDATE; + } + wc->qp = cqe->base_qp; + siw_dbg_cq(cq, "idx %u, type %d, flags %2x, id 0x%p\n", + cq->cq_get % cq->num_cqe, cqe->opcode, + cqe->flags, (void *)cqe->id); + } + WRITE_ONCE(cqe->flags, 0); + cq->cq_get++; + + spin_unlock_irqrestore(&cq->lock, flags); + + return 1; + } + spin_unlock_irqrestore(&cq->lock, flags); + + return 0; +} + +/* + * siw_cq_flush() + * + * Flush all CQ elements. + */ +void siw_cq_flush(struct siw_cq *cq) +{ + struct ib_wc wc; + + while (siw_reap_cqe(cq, &wc)) + ; +} -- cgit v1.2.3-59-g8ed1b