1 #ifndef DEF_RDMAVT_INCCQ_H 2 #define DEF_RDMAVT_INCCQ_H 3 4 /* 5 * 6 * This file is provided under a dual BSD/GPLv2 license. When using or 7 * redistributing this file, you may do so under either license. 8 * 9 * GPL LICENSE SUMMARY 10 * 11 * Copyright(c) 2016 - 2018 Intel Corporation. 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of version 2 of the GNU General Public License as 15 * published by the Free Software Foundation. 16 * 17 * This program is distributed in the hope that it will be useful, but 18 * WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 20 * General Public License for more details. 21 * 22 * BSD LICENSE 23 * 24 * Copyright(c) 2015 Intel Corporation. 25 * 26 * Redistribution and use in source and binary forms, with or without 27 * modification, are permitted provided that the following conditions 28 * are met: 29 * 30 * - Redistributions of source code must retain the above copyright 31 * notice, this list of conditions and the following disclaimer. 32 * - Redistributions in binary form must reproduce the above copyright 33 * notice, this list of conditions and the following disclaimer in 34 * the documentation and/or other materials provided with the 35 * distribution. 36 * - Neither the name of Intel Corporation nor the names of its 37 * contributors may be used to endorse or promote products derived 38 * from this software without specific prior written permission. 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 41 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 42 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 43 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 44 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 46 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 47 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 48 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 49 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 50 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 51 * 52 */ 53 54 #include <linux/kthread.h> 55 #include <rdma/ib_user_verbs.h> 56 57 /* 58 * Define an ib_cq_notify value that is not valid so we know when CQ 59 * notifications are armed. 60 */ 61 #define RVT_CQ_NONE (IB_CQ_NEXT_COMP + 1) 62 63 /* 64 * Define read macro that apply smp_load_acquire memory barrier 65 * when reading indice of circular buffer that mmaped to user space. 66 */ 67 #define RDMA_READ_UAPI_ATOMIC(member) smp_load_acquire(&(member).val) 68 69 /* 70 * Define write macro that uses smp_store_release memory barrier 71 * when writing indice of circular buffer that mmaped to user space. 72 */ 73 #define RDMA_WRITE_UAPI_ATOMIC(member, x) smp_store_release(&(member).val, x) 74 #include <rdma/rvt-abi.h> 75 76 /* 77 * This structure is used to contain the head pointer, tail pointer, 78 * and completion queue entries as a single memory allocation so 79 * it can be mmap'ed into user space. 80 */ 81 struct rvt_k_cq_wc { 82 u32 head; /* index of next entry to fill */ 83 u32 tail; /* index of next ib_poll_cq() entry */ 84 struct ib_wc kqueue[]; 85 }; 86 87 /* 88 * The completion queue structure. 89 */ 90 struct rvt_cq { 91 struct ib_cq ibcq; 92 struct work_struct comptask; 93 spinlock_t lock; /* protect changes in this struct */ 94 u8 notify; 95 u8 triggered; 96 u8 cq_full; 97 int comp_vector_cpu; 98 struct rvt_dev_info *rdi; 99 struct rvt_cq_wc *queue; 100 struct rvt_mmap_info *ip; 101 struct rvt_k_cq_wc *kqueue; 102 }; 103 104 static inline struct rvt_cq *ibcq_to_rvtcq(struct ib_cq *ibcq) 105 { 106 return container_of(ibcq, struct rvt_cq, ibcq); 107 } 108 109 bool rvt_cq_enter(struct rvt_cq *cq, struct ib_wc *entry, bool solicited); 110 111 #endif /* DEF_RDMAVT_INCCQH */ 112