e8223cc6cf
MFC after: 1 week Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D8044
131 lines
4.0 KiB
C
131 lines
4.0 KiB
C
/*-
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* Copyright (c) 2009-2012,2016 Microsoft Corp.
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* Copyright (c) 2012 NetApp Inc.
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* Copyright (c) 2012 Citrix Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _VMBUS_BRVAR_H_
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#define _VMBUS_BRVAR_H_
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/_iovec.h>
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struct vmbus_br {
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struct vmbus_bufring *vbr;
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uint32_t vbr_dsize; /* total data size */
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};
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#define vbr_windex vbr->br_windex
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#define vbr_rindex vbr->br_rindex
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#define vbr_imask vbr->br_imask
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#define vbr_data vbr->br_data
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struct vmbus_rxbr {
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struct mtx rxbr_lock;
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struct vmbus_br rxbr;
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};
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#define rxbr_windex rxbr.vbr_windex
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#define rxbr_rindex rxbr.vbr_rindex
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#define rxbr_imask rxbr.vbr_imask
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#define rxbr_data rxbr.vbr_data
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#define rxbr_dsize rxbr.vbr_dsize
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struct vmbus_txbr {
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struct mtx txbr_lock;
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struct vmbus_br txbr;
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};
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#define txbr_windex txbr.vbr_windex
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#define txbr_rindex txbr.vbr_rindex
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#define txbr_imask txbr.vbr_imask
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#define txbr_data txbr.vbr_data
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#define txbr_dsize txbr.vbr_dsize
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struct sysctl_ctx_list;
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struct sysctl_oid;
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static __inline int
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vmbus_txbr_maxpktsz(const struct vmbus_txbr *tbr)
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{
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/*
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* - 64 bits for the trailing start index (- sizeof(uint64_t)).
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* - The rindex and windex can't be same (- 1). See
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* the comment near vmbus_bufring.br_{r,w}index.
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*/
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return (tbr->txbr_dsize - sizeof(uint64_t) - 1);
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}
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static __inline bool
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vmbus_txbr_empty(const struct vmbus_txbr *tbr)
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{
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return (tbr->txbr_windex == tbr->txbr_rindex ? true : false);
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}
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static __inline bool
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vmbus_rxbr_empty(const struct vmbus_rxbr *rbr)
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{
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return (rbr->rxbr_windex == rbr->rxbr_rindex ? true : false);
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}
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static __inline int
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vmbus_br_nelem(int br_size, int elem_size)
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{
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/* Strip bufring header */
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br_size -= sizeof(struct vmbus_bufring);
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/* Add per-element trailing index */
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elem_size += sizeof(uint64_t);
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return (br_size / elem_size);
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}
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void vmbus_br_sysctl_create(struct sysctl_ctx_list *ctx,
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struct sysctl_oid *br_tree, struct vmbus_br *br,
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const char *name);
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void vmbus_rxbr_init(struct vmbus_rxbr *rbr);
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void vmbus_rxbr_deinit(struct vmbus_rxbr *rbr);
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void vmbus_rxbr_setup(struct vmbus_rxbr *rbr, void *buf, int blen);
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int vmbus_rxbr_peek(struct vmbus_rxbr *rbr, void *data, int dlen);
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int vmbus_rxbr_read(struct vmbus_rxbr *rbr, void *data, int dlen,
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uint32_t skip);
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void vmbus_rxbr_intr_mask(struct vmbus_rxbr *rbr);
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uint32_t vmbus_rxbr_intr_unmask(struct vmbus_rxbr *rbr);
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void vmbus_txbr_init(struct vmbus_txbr *tbr);
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void vmbus_txbr_deinit(struct vmbus_txbr *tbr);
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void vmbus_txbr_setup(struct vmbus_txbr *tbr, void *buf, int blen);
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int vmbus_txbr_write(struct vmbus_txbr *tbr,
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const struct iovec iov[], int iovlen, boolean_t *need_sig);
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#endif /* _VMBUS_BRVAR_H_ */
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