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