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