1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2019 Vincenzo Maffione <vmaffione@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS 19 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 20 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 21 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 22 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 24 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 25 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 #ifndef __NET_BACKENDS_H__ 31 #define __NET_BACKENDS_H__ 32 33 #include <stdint.h> 34 35 /* Opaque type representing a network backend. */ 36 typedef struct net_backend net_backend_t; 37 38 /* Interface between network frontends and the network backends. */ 39 typedef void (*net_be_rxeof_t)(int, enum ev_type, void *param); 40 int netbe_init(net_backend_t **be, const char *opts, net_be_rxeof_t cb, 41 void *param); 42 void netbe_cleanup(net_backend_t *be); 43 uint64_t netbe_get_cap(net_backend_t *be); 44 int netbe_set_cap(net_backend_t *be, uint64_t cap, 45 unsigned vnet_hdr_len); 46 size_t netbe_get_vnet_hdr_len(net_backend_t *be); 47 ssize_t netbe_send(net_backend_t *be, const struct iovec *iov, int iovcnt); 48 ssize_t netbe_peek_recvlen(net_backend_t *be); 49 ssize_t netbe_recv(net_backend_t *be, const struct iovec *iov, int iovcnt); 50 ssize_t netbe_rx_discard(net_backend_t *be); 51 void netbe_rx_disable(net_backend_t *be); 52 void netbe_rx_enable(net_backend_t *be); 53 54 55 /* 56 * Network device capabilities taken from the VirtIO standard. 57 * Despite the name, these capabilities can be used by different frontents 58 * (virtio-net, ptnet) and supported by different backends (netmap, tap, ...). 59 */ 60 #define VIRTIO_NET_F_CSUM (1 << 0) /* host handles partial cksum */ 61 #define VIRTIO_NET_F_GUEST_CSUM (1 << 1) /* guest handles partial cksum */ 62 #define VIRTIO_NET_F_MTU (1 << 3) /* initial MTU advice */ 63 #define VIRTIO_NET_F_MAC (1 << 5) /* host supplies MAC */ 64 #define VIRTIO_NET_F_GSO_DEPREC (1 << 6) /* deprecated: host handles GSO */ 65 #define VIRTIO_NET_F_GUEST_TSO4 (1 << 7) /* guest can rcv TSOv4 */ 66 #define VIRTIO_NET_F_GUEST_TSO6 (1 << 8) /* guest can rcv TSOv6 */ 67 #define VIRTIO_NET_F_GUEST_ECN (1 << 9) /* guest can rcv TSO with ECN */ 68 #define VIRTIO_NET_F_GUEST_UFO (1 << 10) /* guest can rcv UFO */ 69 #define VIRTIO_NET_F_HOST_TSO4 (1 << 11) /* host can rcv TSOv4 */ 70 #define VIRTIO_NET_F_HOST_TSO6 (1 << 12) /* host can rcv TSOv6 */ 71 #define VIRTIO_NET_F_HOST_ECN (1 << 13) /* host can rcv TSO with ECN */ 72 #define VIRTIO_NET_F_HOST_UFO (1 << 14) /* host can rcv UFO */ 73 #define VIRTIO_NET_F_MRG_RXBUF (1 << 15) /* host can merge RX buffers */ 74 #define VIRTIO_NET_F_STATUS (1 << 16) /* config status field available */ 75 #define VIRTIO_NET_F_CTRL_VQ (1 << 17) /* control channel available */ 76 #define VIRTIO_NET_F_CTRL_RX (1 << 18) /* control channel RX mode support */ 77 #define VIRTIO_NET_F_CTRL_VLAN (1 << 19) /* control channel VLAN filtering */ 78 #define VIRTIO_NET_F_GUEST_ANNOUNCE \ 79 (1 << 21) /* guest can send gratuitous pkts */ 80 #define VIRTIO_NET_F_MQ (1 << 22) /* host supports multiple VQ pairs */ 81 82 /* 83 * Fixed network header size 84 */ 85 struct virtio_net_rxhdr { 86 uint8_t vrh_flags; 87 uint8_t vrh_gso_type; 88 uint16_t vrh_hdr_len; 89 uint16_t vrh_gso_size; 90 uint16_t vrh_csum_start; 91 uint16_t vrh_csum_offset; 92 uint16_t vrh_bufs; 93 } __packed; 94 95 #endif /* __NET_BACKENDS_H__ */ 96