6bd57d14ed
New design allows to attach multiple consumers to ntb_transport(4) instance. Previous design obtained from Linux theoretically allowed that, but was not practically usable (Linux also has only one consumer driver now).
62 lines
2.6 KiB
C
62 lines
2.6 KiB
C
/*-
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* Copyright (c) 2016 Alexander Motin <mav@FreeBSD.org>
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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, this list of conditions and the following 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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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struct ntb_transport_qp;
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extern devclass_t ntb_transport_devclass;
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enum ntb_link_event {
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NTB_LINK_DOWN = 0,
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NTB_LINK_UP,
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};
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struct ntb_queue_handlers {
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void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data,
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void *data, int len);
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void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data,
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void *data, int len);
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void (*event_handler)(void *data, enum ntb_link_event status);
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};
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int ntb_transport_queue_count(device_t dev);
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struct ntb_transport_qp *
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ntb_transport_create_queue(device_t dev, int q,
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const struct ntb_queue_handlers *handlers, void *data);
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void ntb_transport_free_queue(struct ntb_transport_qp *qp);
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unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp);
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unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp);
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int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data,
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unsigned int len);
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int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data,
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unsigned int len);
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void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len);
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void ntb_transport_link_up(struct ntb_transport_qp *qp);
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void ntb_transport_link_down(struct ntb_transport_qp *qp);
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bool ntb_transport_link_query(struct ntb_transport_qp *qp);
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unsigned int ntb_transport_tx_free_entry(struct ntb_transport_qp *qp);
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