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List: linux-rdma
Subject: Re: [PATCH v5 11/13] SIW completion queue methods
From: "Bernard Metzler" <BMT () zurich ! ibm ! com>
Date: 2019-02-28 15:41:57
Message-ID: OF2AF6D0E0.87FAD686-ON002583AF.00563D34-002583AF.00563D3A () notes ! na ! collabserv ! com
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-----"Chuck Lever" <chuck.lever@oracle.com> wrote: -----
>To: "Bernard Metzler" <BMT@zurich.ibm.com>
>From: "Chuck Lever" <chuck.lever@oracle.com>
>Date: 02/28/2019 03:57PM
>Cc: "Gal Pressman" <galpress@amazon.com>, linux-rdma@vger.kernel.org
>Subject: Re: [PATCH v5 11/13] SIW completion queue methods
>
>
>> On Feb 28, 2019, at 9:36 AM, Bernard Metzler <BMT@zurich.ibm.com>
>wrote:
>>
>> -----"Gal Pressman" <galpress@amazon.com> wrote: -----
>>
>>> To: "Bernard Metzler" <bmt@zurich.ibm.com>,
>>> <linux-rdma@vger.kernel.org>
>>> From: "Gal Pressman" <galpress@amazon.com>
>>> Date: 02/28/2019 03:15PM
>>> Subject: Re: [PATCH v5 11/13] SIW completion queue methods
>>>
>>> On 19-Feb-19 12:09, Bernard Metzler wrote:
>>>> Signed-off-by: Bernard Metzler <bmt@zurich.ibm.com>
>>>> ---
>>>> drivers/infiniband/sw/siw/siw_cq.c | 149
>>> +++++++++++++++++++++++++++++
>>>> 1 file changed, 149 insertions(+)
>>>> create mode 100644 drivers/infiniband/sw/siw/siw_cq.c
>>>>
>>>> diff --git a/drivers/infiniband/sw/siw/siw_cq.c
>>> b/drivers/infiniband/sw/siw/siw_cq.c
>>>> new file mode 100644
>>>> index 000000000000..28c436f43597
>>>> --- /dev/null
>>>> +++ b/drivers/infiniband/sw/siw/siw_cq.c
>>>> @@ -0,0 +1,149 @@
>>>> +// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
>>>> +/*
>>>> + * Software iWARP device driver
>>>> + *
>>>> + * Authors: Bernard Metzler <bmt@zurich.ibm.com>
>>>> + *
>>>> + * Copyright (c) 2008-2018, IBM Corporation
>>>> + *
>>>> + * This software is available to you under a choice of one of
>two
>>>> + * licenses. You may choose to be licensed under the terms of
>the
>>> GNU
>>>> + * General Public License (GPL) Version 2, available from the
>file
>>>> + * COPYING in the main directory of this source tree, or the
>>>> + * BSD license below:
>>>> + *
>>>> + * Redistribution and use in source and binary forms, with or
>>>> + * without modification, are permitted provided that the
>>> following
>>>> + * conditions are met:
>>>> + *
>>>> + * - Redistributions of source code must retain the above
>>> copyright notice,
>>>> + * this list of conditions and the following disclaimer.
>>>> + *
>>>> + * - Redistributions in binary form must reproduce the above
>>> copyright
>>>> + * notice, this list of conditions and the following
>>> disclaimer in the
>>>> + * documentation and/or other materials provided with the
>>> distribution.
>>>> + *
>>>> + * - Neither the name of IBM nor the names of its contributors
>>> may be
>>>> + * used to endorse or promote products derived from this
>>> software without
>>>> + * specific prior written permission.
>>>> + *
>>>> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
>KIND,
>>>> + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
>WARRANTIES
>>> OF
>>>> + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
>>>> + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
>>> HOLDERS
>>>> + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
>IN
>>> AN
>>>> + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
>OR
>>> IN
>>>> + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
>>> THE
>>>> + * SOFTWARE.
>>>> + */
>>>> +
>>>> +#include <linux/errno.h>
>>>> +#include <linux/types.h>
>>>> +#include <linux/list.h>
>>>> +
>>>> +#include <rdma/iw_cm.h>
>>>> +#include <rdma/ib_verbs.h>
>>>> +#include <rdma/ib_smi.h>
>>>> +#include <rdma/ib_user_verbs.h>
>>>> +
>>>> +#include "siw.h"
>>>> +#include "siw_obj.h"
>>>> +#include "siw_cm.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;
>>>
>>> Don't you need to fill wc->wc_flags as well?
>>
>> good point.
>> all zero here, since no immediate data are implemented
>> in the version I am pushing. We have a prototype implementing
>> RFC 7306 (atomics and immediate data), but let's do such
>> an update later, if we got basic siw accepted.
>>
>> Other completion flags are not relevant as well.
>
>Hum. Does that mean remote invalidation is not supported?
OO! It is... So I need IB_WC_WITH_INVALIDATE support.
NVMeF stuff seem to be forgiving...
>
>
>>>> +
>>>> + /*
>>>> + * During CQ flush, also user land CQE's may
>>>> + * get reaped here, which do not hold a QP
>>>> + * reference.
>>>> + */
>>>> + if (likely(cq->kernel_verbs)) {
>>>> + wc->qp = &((struct siw_qp *)cqe->qp)->base_qp;
>>>> + siw_dbg_obj(cq, "[QP %d]: reap wqe type %d, idx %d\n",
>>>> + QP_ID(cqe->qp), cqe->opcode,
>>>> + cq->cq_get % cq->num_cqe);
>>>> + siw_qp_put(cqe->qp);
>>>> + }
>>>> + WRITE_ONCE(cqe->flags, 0);
>>>> + cq->cq_get++;
>>>> +
>>>> + spin_unlock_irqrestore(&cq->lock, flags);
>>>> +
>>>> + return 1;
>>>> + }
>>>> + spin_unlock_irqrestore(&cq->lock, flags);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +void siw_completion_task(unsigned long data)
>>>> +{
>>>> + struct ib_cq *base_cq = (struct ib_cq *)data;
>>>> +
>>>> + (*base_cq->comp_handler)(base_cq, base_cq->cq_context);
>>>> +}
>>>> +
>>>> +/*
>>>> + * siw_cq_flush()
>>>> + *
>>>> + * Flush all CQ elements.
>>>> + */
>>>> +void siw_cq_flush(struct siw_cq *cq)
>>>> +{
>>>> + struct ib_wc wc;
>>>> + int got;
>>>> +
>>>> + siw_dbg(cq->hdr.sdev, "[CQ %d]: enter\n", OBJ_ID(cq));
>>>> +
>>>> + do {
>>>> + got = siw_reap_cqe(cq, &wc);
>>>> + } while (got > 0);
>>>> +}
>>>>
>>>
>>> Reviewed-by: Gal Pressman <galpress@amazon.com>
>
>--
>Chuck Lever
>
>
>
>
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