vmbus_brvar.h

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    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  * $FreeBSD$
   29  */
   30 
   31 #ifndef _VMBUS_BRVAR_H_
   32 #define _VMBUS_BRVAR_H_
   33 
   34 #include <sys/param.h>
   35 #include <sys/lock.h>
   36 #include <sys/mutex.h>
   37 #include <sys/_iovec.h>
   38 
   39 struct vmbus_br {
   40         struct vmbus_bufring    *vbr;
   41         uint32_t                vbr_dsize;      /* total data size */
   42 };
   43 
   44 #define vbr_windex              vbr->br_windex
   45 #define vbr_rindex              vbr->br_rindex
   46 #define vbr_imask               vbr->br_imask
   47 #define vbr_psndsz              vbr->br_pending_snd_sz
   48 #define vbr_fpsndsz             vbr->br_feature_bits.feat_pending_snd_sz
   49 #define vbr_fvalue              vbr->br_feature_bits.value
   50 #define vbr_intrcnt             vbr->br_g2h_intr_cnt
   51 #define vbr_data                vbr->br_data
   52 
   53 struct vmbus_rxbr {
   54         struct mtx              rxbr_lock;
   55         struct vmbus_br         rxbr;
   56 };
   57 
   58 #define rxbr_windex             rxbr.vbr_windex
   59 #define rxbr_rindex             rxbr.vbr_rindex
   60 #define rxbr_imask              rxbr.vbr_imask
   61 #define rxbr_psndsz             rxbr.vbr_psndsz
   62 #define rxbr_fpsndsz            rxbr.vbr_fpsndsz
   63 #define rxbr_fvalue             rxbr.vbr_fvalue
   64 #define rxbr_intrcnt            rxbr.vbr_intrcnt
   65 #define rxbr_data               rxbr.vbr_data
   66 #define rxbr_dsize              rxbr.vbr_dsize
   67 
   68 struct vmbus_txbr {
   69         struct mtx              txbr_lock;
   70         struct vmbus_br         txbr;
   71 };
   72 
   73 #define txbr_windex             txbr.vbr_windex
   74 #define txbr_rindex             txbr.vbr_rindex
   75 #define txbr_imask              txbr.vbr_imask
   76 #define txbr_psndsz             txbr.vbr_psndsz
   77 #define txbr_fpsndsz            txbr.vbr_fpsndsz
   78 #define txbr_fvalue             txbr.vbr_fvalue
   79 #define txbr_intrcnt            txbr.vbr_intrcnt
   80 #define txbr_data               txbr.vbr_data
   81 #define txbr_dsize              txbr.vbr_dsize
   82 
   83 struct sysctl_ctx_list;
   84 struct sysctl_oid;
   85 
   86 static __inline int
   87 vmbus_txbr_maxpktsz(const struct vmbus_txbr *tbr)
   88 {
   89 
   90         /*
   91          * - 64 bits for the trailing start index (- sizeof(uint64_t)).
   92          * - The rindex and windex can't be same (- 1).  See
   93          *   the comment near vmbus_bufring.br_{r,w}index.
   94          */
   95         return (tbr->txbr_dsize - sizeof(uint64_t) - 1);
   96 }
   97 
   98 static __inline bool
   99 vmbus_txbr_empty(const struct vmbus_txbr *tbr)
  100 {
  101 
  102         return (tbr->txbr_windex == tbr->txbr_rindex ? true : false);
  103 }
  104 
  105 static __inline bool
  106 vmbus_rxbr_empty(const struct vmbus_rxbr *rbr)
  107 {
  108 
  109         return (rbr->rxbr_windex == 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);
  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_ */

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FreeBSD/Linux Kernel Cross Reference sys/dev/hyperv/vmbus/vmbus_brvar.h

FreeBSD/Linux Kernel Cross Reference
sys/dev/hyperv/vmbus/vmbus_brvar.h