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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2019 Vincenzo Maffione <vmaffione@FreeBSD.org>
*
* 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, 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 AND CONTRIBUTORS``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 OR CONTRIBUTORS
* 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 __NET_BACKENDS_H__
#define __NET_BACKENDS_H__
#include <stdint.h>
/* Opaque type representing a network backend. */
typedef struct net_backend net_backend_t;
/* Interface between network frontends and the network backends. */
typedef void (*net_be_rxeof_t)(int, enum ev_type, void *param);
int netbe_init(net_backend_t **be, nvlist_t *nvl, net_be_rxeof_t cb,
void *param);
int netbe_legacy_config(nvlist_t *nvl, const char *opts);
void netbe_cleanup(net_backend_t *be);
uint64_t netbe_get_cap(net_backend_t *be);
int netbe_set_cap(net_backend_t *be, uint64_t cap,
unsigned vnet_hdr_len);
size_t netbe_get_vnet_hdr_len(net_backend_t *be);
ssize_t netbe_send(net_backend_t *be, const struct iovec *iov, int iovcnt);
ssize_t netbe_peek_recvlen(net_backend_t *be);
ssize_t netbe_recv(net_backend_t *be, const struct iovec *iov, int iovcnt);
ssize_t netbe_rx_discard(net_backend_t *be);
void netbe_rx_disable(net_backend_t *be);
void netbe_rx_enable(net_backend_t *be);
/*
* Network device capabilities taken from the VirtIO standard.
* Despite the name, these capabilities can be used by different frontents
* (virtio-net, ptnet) and supported by different backends (netmap, tap, ...).
*/
#define VIRTIO_NET_F_CSUM (1 << 0) /* host handles partial cksum */
#define VIRTIO_NET_F_GUEST_CSUM (1 << 1) /* guest handles partial cksum */
#define VIRTIO_NET_F_MTU (1 << 3) /* initial MTU advice */
#define VIRTIO_NET_F_MAC (1 << 5) /* host supplies MAC */
#define VIRTIO_NET_F_GSO_DEPREC (1 << 6) /* deprecated: host handles GSO */
#define VIRTIO_NET_F_GUEST_TSO4 (1 << 7) /* guest can rcv TSOv4 */
#define VIRTIO_NET_F_GUEST_TSO6 (1 << 8) /* guest can rcv TSOv6 */
#define VIRTIO_NET_F_GUEST_ECN (1 << 9) /* guest can rcv TSO with ECN */
#define VIRTIO_NET_F_GUEST_UFO (1 << 10) /* guest can rcv UFO */
#define VIRTIO_NET_F_HOST_TSO4 (1 << 11) /* host can rcv TSOv4 */
#define VIRTIO_NET_F_HOST_TSO6 (1 << 12) /* host can rcv TSOv6 */
#define VIRTIO_NET_F_HOST_ECN (1 << 13) /* host can rcv TSO with ECN */
#define VIRTIO_NET_F_HOST_UFO (1 << 14) /* host can rcv UFO */
#define VIRTIO_NET_F_MRG_RXBUF (1 << 15) /* host can merge RX buffers */
#define VIRTIO_NET_F_STATUS (1 << 16) /* config status field available */
#define VIRTIO_NET_F_CTRL_VQ (1 << 17) /* control channel available */
#define VIRTIO_NET_F_CTRL_RX (1 << 18) /* control channel RX mode support */
#define VIRTIO_NET_F_CTRL_VLAN (1 << 19) /* control channel VLAN filtering */
#define VIRTIO_NET_F_GUEST_ANNOUNCE \
(1 << 21) /* guest can send gratuitous pkts */
#define VIRTIO_NET_F_MQ (1 << 22) /* host supports multiple VQ pairs */
/*
* Fixed network header size
*/
struct virtio_net_rxhdr {
uint8_t vrh_flags;
uint8_t vrh_gso_type;
uint16_t vrh_hdr_len;
uint16_t vrh_gso_size;
uint16_t vrh_csum_start;
uint16_t vrh_csum_offset;
uint16_t vrh_bufs;
} __packed;
#endif /* __NET_BACKENDS_H__ */
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