Reviewed by: jhb, markj, imp MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D20874
90 lines
3.9 KiB
C
90 lines
3.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2019 Vincenzo Maffione <vmaffione@FreeBSD.org>
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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
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* 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 __NET_BACKENDS_H__
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#define __NET_BACKENDS_H__
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#include <stdint.h>
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/* Opaque type representing a network backend. */
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typedef struct net_backend net_backend_t;
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/* Interface between network frontends and the network backends. */
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typedef void (*net_be_rxeof_t)(int, enum ev_type, void *param);
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int netbe_init(net_backend_t **be, const char *devname, net_be_rxeof_t cb,
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void *param);
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void netbe_cleanup(net_backend_t *be);
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uint64_t netbe_get_cap(net_backend_t *be);
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int netbe_set_cap(net_backend_t *be, uint64_t cap,
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unsigned vnet_hdr_len);
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ssize_t netbe_send(net_backend_t *be, struct iovec *iov, int iovcnt);
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ssize_t netbe_recv(net_backend_t *be, struct iovec *iov, int iovcnt);
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ssize_t netbe_rx_discard(net_backend_t *be);
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/*
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* Network device capabilities taken from the VirtIO standard.
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* Despite the name, these capabilities can be used by different frontents
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* (virtio-net, ptnet) and supported by different backends (netmap, tap, ...).
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*/
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#define VIRTIO_NET_F_CSUM (1 << 0) /* host handles partial cksum */
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#define VIRTIO_NET_F_GUEST_CSUM (1 << 1) /* guest handles partial cksum */
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#define VIRTIO_NET_F_MAC (1 << 5) /* host supplies MAC */
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#define VIRTIO_NET_F_GSO_DEPREC (1 << 6) /* deprecated: host handles GSO */
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#define VIRTIO_NET_F_GUEST_TSO4 (1 << 7) /* guest can rcv TSOv4 */
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#define VIRTIO_NET_F_GUEST_TSO6 (1 << 8) /* guest can rcv TSOv6 */
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#define VIRTIO_NET_F_GUEST_ECN (1 << 9) /* guest can rcv TSO with ECN */
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#define VIRTIO_NET_F_GUEST_UFO (1 << 10) /* guest can rcv UFO */
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#define VIRTIO_NET_F_HOST_TSO4 (1 << 11) /* host can rcv TSOv4 */
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#define VIRTIO_NET_F_HOST_TSO6 (1 << 12) /* host can rcv TSOv6 */
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#define VIRTIO_NET_F_HOST_ECN (1 << 13) /* host can rcv TSO with ECN */
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#define VIRTIO_NET_F_HOST_UFO (1 << 14) /* host can rcv UFO */
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#define VIRTIO_NET_F_MRG_RXBUF (1 << 15) /* host can merge RX buffers */
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#define VIRTIO_NET_F_STATUS (1 << 16) /* config status field available */
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#define VIRTIO_NET_F_CTRL_VQ (1 << 17) /* control channel available */
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#define VIRTIO_NET_F_CTRL_RX (1 << 18) /* control channel RX mode support */
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#define VIRTIO_NET_F_CTRL_VLAN (1 << 19) /* control channel VLAN filtering */
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#define VIRTIO_NET_F_GUEST_ANNOUNCE \
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(1 << 21) /* guest can send gratuitous pkts */
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/*
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* Fixed network header size
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*/
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struct virtio_net_rxhdr {
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uint8_t vrh_flags;
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uint8_t vrh_gso_type;
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uint16_t vrh_hdr_len;
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uint16_t vrh_gso_size;
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uint16_t vrh_csum_start;
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uint16_t vrh_csum_offset;
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uint16_t vrh_bufs;
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} __packed;
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#endif /* __NET_BACKENDS_H__ */
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