1 /*- 2 * Copyright (c) 2009-2012,2016 Microsoft Corp. 3 * Copyright (c) 2012 NetApp Inc. 4 * Copyright (c) 2012 Citrix Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #ifndef _VMBUS_BRVAR_H_ 30 #define _VMBUS_BRVAR_H_ 31 32 #include <sys/param.h> 33 #include <sys/lock.h> 34 #include <sys/mutex.h> 35 #include <sys/_iovec.h> 36 37 struct vmbus_br { 38 struct vmbus_bufring *vbr; 39 uint32_t vbr_dsize; /* total data size */ 40 }; 41 42 #define vbr_windex vbr->br_windex 43 #define vbr_rindex vbr->br_rindex 44 #define vbr_imask vbr->br_imask 45 #define vbr_psndsz vbr->br_pending_snd_sz 46 #define vbr_fpsndsz vbr->br_feature_bits.feat_pending_snd_sz 47 #define vbr_fvalue vbr->br_feature_bits.value 48 #define vbr_intrcnt vbr->br_g2h_intr_cnt 49 #define vbr_data vbr->br_data 50 51 struct vmbus_rxbr { 52 struct mtx rxbr_lock; 53 struct vmbus_br rxbr; 54 }; 55 56 #define rxbr_windex rxbr.vbr_windex 57 #define rxbr_rindex rxbr.vbr_rindex 58 #define rxbr_imask rxbr.vbr_imask 59 #define rxbr_psndsz rxbr.vbr_psndsz 60 #define rxbr_fpsndsz rxbr.vbr_fpsndsz 61 #define rxbr_fvalue rxbr.vbr_fvalue 62 #define rxbr_intrcnt rxbr.vbr_intrcnt 63 #define rxbr_data rxbr.vbr_data 64 #define rxbr_dsize rxbr.vbr_dsize 65 66 struct vmbus_txbr { 67 struct mtx txbr_lock; 68 struct vmbus_br txbr; 69 }; 70 71 #define txbr_windex txbr.vbr_windex 72 #define txbr_rindex txbr.vbr_rindex 73 #define txbr_imask txbr.vbr_imask 74 #define txbr_psndsz txbr.vbr_psndsz 75 #define txbr_fpsndsz txbr.vbr_fpsndsz 76 #define txbr_fvalue txbr.vbr_fvalue 77 #define txbr_intrcnt txbr.vbr_intrcnt 78 #define txbr_data txbr.vbr_data 79 #define txbr_dsize txbr.vbr_dsize 80 81 struct sysctl_ctx_list; 82 struct sysctl_oid; 83 84 static __inline int 85 vmbus_txbr_maxpktsz(const struct vmbus_txbr *tbr) 86 { 87 88 /* 89 * - 64 bits for the trailing start index (- sizeof(uint64_t)). 90 * - The rindex and windex can't be same (- 1). See 91 * the comment near vmbus_bufring.br_{r,w}index. 92 */ 93 return (tbr->txbr_dsize - sizeof(uint64_t) - 1); 94 } 95 96 static __inline bool 97 vmbus_txbr_empty(const struct vmbus_txbr *tbr) 98 { 99 100 return (atomic_load_acq_32(&tbr->txbr_windex) == 101 atomic_load_acq_32(&tbr->txbr_rindex) ? true : false); 102 } 103 104 static __inline bool 105 vmbus_rxbr_empty(const struct vmbus_rxbr *rbr) 106 { 107 108 return (atomic_load_acq_32(&rbr->rxbr_windex) == 109 atomic_load_acq_32(&rbr->rxbr_rindex) ? true : false); 110 } 111 112 static __inline int 113 vmbus_br_nelem(int br_size, int elem_size) 114 { 115 116 /* Strip bufring header */ 117 br_size -= sizeof(struct vmbus_bufring); 118 /* Add per-element trailing index */ 119 elem_size += sizeof(uint64_t); 120 return (br_size / elem_size); 121 } 122 123 void vmbus_br_sysctl_create(struct sysctl_ctx_list *ctx, 124 struct sysctl_oid *br_tree, struct vmbus_br *br, 125 const char *name); 126 127 void vmbus_rxbr_init(struct vmbus_rxbr *rbr); 128 void vmbus_rxbr_deinit(struct vmbus_rxbr *rbr); 129 void vmbus_rxbr_setup(struct vmbus_rxbr *rbr, void *buf, int blen); 130 int vmbus_rxbr_peek(struct vmbus_rxbr *rbr, void *data, int dlen); 131 int vmbus_rxbr_read(struct vmbus_rxbr *rbr, void *data, int dlen, 132 uint32_t skip, boolean_t *need_sig); 133 int vmbus_rxbr_idxadv(struct vmbus_rxbr *rbr, uint32_t idx_adv, 134 boolean_t *need_sig); 135 int vmbus_rxbr_idxadv_peek(struct vmbus_rxbr *rbr, void *data, 136 int dlen, uint32_t idx_adv, boolean_t *need_sig); 137 int vmbus_rxbr_peek_call(struct vmbus_rxbr *rbr, int dlen, 138 uint32_t skip, vmbus_br_copy_callback_t cb, void *cbarg); 139 void vmbus_rxbr_intr_mask(struct vmbus_rxbr *rbr); 140 uint32_t vmbus_rxbr_intr_unmask(struct vmbus_rxbr *rbr); 141 uint32_t vmbus_rxbr_available(const struct vmbus_rxbr *rbr); 142 143 void vmbus_txbr_init(struct vmbus_txbr *tbr); 144 void vmbus_txbr_deinit(struct vmbus_txbr *tbr); 145 void vmbus_txbr_setup(struct vmbus_txbr *tbr, void *buf, int blen); 146 int vmbus_txbr_write(struct vmbus_txbr *tbr, 147 const struct iovec iov[], int iovlen, boolean_t *need_sig); 148 int vmbus_txbr_write_call(struct vmbus_txbr *tbr, 149 const struct iovec iov[], int iovlen, 150 vmbus_br_copy_callback_t cb, void *cbarg, 151 boolean_t *need_sig); 152 uint32_t vmbus_txbr_available(const struct vmbus_txbr *tbr); 153 uint32_t vmbus_txbr_get_imask(const struct vmbus_txbr *tbr); 154 void vmbus_txbr_set_pending_snd_sz(struct vmbus_txbr *tbr, 155 uint32_t size); 156 157 #endif /* _VMBUS_BRVAR_H_ */ 158