LXR linux/drivers/infiniband/hw/hfi1/verbs

   1/*
   2 * Copyright(c) 2016 - 2018 Intel Corporation.
   3 *
   4 * This file is provided under a dual BSD/GPLv2 license.  When using or
   5 * redistributing this file, you may do so under either license.
   6 *
   7 * GPL LICENSE SUMMARY
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of version 2 of the GNU General Public License as
  11 * published by the Free Software Foundation.
  12 *
  13 * This program is distributed in the hope that it will be useful, but
  14 * WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 * General Public License for more details.
  17 *
  18 * BSD LICENSE
  19 *
  20 * Redistribution and use in source and binary forms, with or without
  21 * modification, are permitted provided that the following conditions
  22 * are met:
  23 *
  24 *  - Redistributions of source code must retain the above copyright
  25 *    notice, this list of conditions and the following disclaimer.
  26 *  - Redistributions in binary form must reproduce the above copyright
  27 *    notice, this list of conditions and the following disclaimer in
  28 *    the documentation and/or other materials provided with the
  29 *    distribution.
  30 *  - Neither the name of Intel Corporation nor the names of its
  31 *    contributors may be used to endorse or promote products derived
  32 *    from this software without specific prior written permission.
  33 *
  34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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  42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  45 *
  46 */
  47
  48#ifndef HFI1_VERBS_TXREQ_H
  49#define HFI1_VERBS_TXREQ_H
  50
  51#include <linux/types.h>
  52#include <linux/slab.h>
  53
  54#include "verbs.h"
  55#include "sdma_txreq.h"
  56#include "iowait.h"
  57
  58struct verbs_txreq {
  59        struct hfi1_sdma_header phdr;
  60        struct sdma_txreq       txreq;
  61        struct rvt_qp           *qp;
  62        struct rvt_swqe         *wqe;
  63        struct rvt_mregion      *mr;
  64        struct rvt_sge_state    *ss;
  65        struct sdma_engine     *sde;
  66        struct send_context     *psc;
  67        u16                     hdr_dwords;
  68        u16                     s_cur_size;
  69};
  70
  71struct hfi1_ibdev;
  72struct verbs_txreq *__get_txreq(struct hfi1_ibdev *dev,
  73                                struct rvt_qp *qp);
  74
  75#define VERBS_TXREQ_GFP (GFP_ATOMIC | __GFP_NOWARN)
  76static inline struct verbs_txreq *get_txreq(struct hfi1_ibdev *dev,
  77                                            struct rvt_qp *qp)
  78        __must_hold(&qp->slock)
  79{
  80        struct verbs_txreq *tx;
  81        struct hfi1_qp_priv *priv = qp->priv;
  82
  83        tx = kmem_cache_alloc(dev->verbs_txreq_cache, VERBS_TXREQ_GFP);
  84        if (unlikely(!tx)) {
  85                /* call slow path to get the lock */
  86                tx = __get_txreq(dev, qp);
  87                if (!tx)
  88                        return tx;
  89        }
  90        tx->qp = qp;
  91        tx->mr = NULL;
  92        tx->sde = priv->s_sde;
  93        tx->psc = priv->s_sendcontext;
  94        /* so that we can test if the sdma descriptors are there */
  95        tx->txreq.num_desc = 0;
  96        /* Set the header type */
  97        tx->phdr.hdr.hdr_type = priv->hdr_type;
  98        tx->txreq.flags = 0;
  99        return tx;
 100}
 101
 102static inline struct sdma_txreq *get_sdma_txreq(struct verbs_txreq *tx)
 103{
 104        return &tx->txreq;
 105}
 106
 107static inline struct verbs_txreq *get_waiting_verbs_txreq(struct iowait_work *w)
 108{
 109        struct sdma_txreq *stx;
 110
 111        stx = iowait_get_txhead(w);
 112        if (stx)
 113                return container_of(stx, struct verbs_txreq, txreq);
 114        return NULL;
 115}
 116
 117static inline bool verbs_txreq_queued(struct iowait_work *w)
 118{
 119        return iowait_packet_queued(w);
 120}
 121
 122void hfi1_put_txreq(struct verbs_txreq *tx);
 123int verbs_txreq_init(struct hfi1_ibdev *dev);
 124void verbs_txreq_exit(struct hfi1_ibdev *dev);
 125
 126#endif                         /* HFI1_VERBS_TXREQ_H */
 127