1/*
2 * Copyright (C) 2018 Giuseppe Lettieri
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *   1. Redistributions of source code must retain the above copyright
9 *      notice, this list of conditions and the following disclaimer.
10 *   2. Redistributions in binary form must reproduce the above copyright
11 *      notice, this list of conditions and the following disclaimer in the
12 *      documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#if defined(__FreeBSD__)
28#include <sys/cdefs.h> /* prerequisite */
29
30#include <sys/types.h>
31#include <sys/errno.h>
32#include <sys/param.h>	/* defines used in kernel.h */
33#include <sys/kernel.h>	/* types used in module initialization */
34#include <sys/malloc.h>
35#include <sys/poll.h>
36#include <sys/lock.h>
37#include <sys/rwlock.h>
38#include <sys/selinfo.h>
39#include <sys/sysctl.h>
40#include <sys/socket.h> /* sockaddrs */
41#include <net/if.h>
42#include <net/if_var.h>
43#include <machine/bus.h>	/* bus_dmamap_* */
44#include <sys/refcount.h>
45
46
47#elif defined(linux)
48
49#include "bsd_glue.h"
50
51#elif defined(__APPLE__)
52
53#warning OSX support is only partial
54#include "osx_glue.h"
55
56#elif defined(_WIN32)
57#include "win_glue.h"
58
59#else
60
61#error	Unsupported platform
62
63#endif /* unsupported */
64
65/*
66 * common headers
67 */
68
69#include <net/netmap.h>
70#include <dev/netmap/netmap_kern.h>
71#include <dev/netmap/netmap_mem2.h>
72
73#ifdef WITH_NMNULL
74
75static int
76netmap_null_sync(struct netmap_kring *kring, int flags)
77{
78	(void)kring;
79	(void)flags;
80	return 0;
81}
82
83static int
84netmap_null_krings_create(struct netmap_adapter *na)
85{
86	return netmap_krings_create(na, 0);
87}
88
89static int
90netmap_null_reg(struct netmap_adapter *na, int onoff)
91{
92	if (na->active_fds == 0) {
93		if (onoff)
94			na->na_flags |= NAF_NETMAP_ON;
95		else
96			na->na_flags &= ~NAF_NETMAP_ON;
97	}
98	return 0;
99}
100
101static int
102netmap_null_bdg_attach(const char *name, struct netmap_adapter *na,
103		struct nm_bridge *b)
104{
105	(void)name;
106	(void)na;
107	(void)b;
108	return EINVAL;
109}
110
111int
112netmap_get_null_na(struct nmreq_header *hdr, struct netmap_adapter **na,
113		struct netmap_mem_d *nmd, int create)
114{
115	struct nmreq_register *req = (struct nmreq_register *)(uintptr_t)hdr->nr_body;
116	struct netmap_null_adapter *nna;
117	int error;
118
119	if (req->nr_mode != NR_REG_NULL) {
120		nm_prdis("not a null port");
121		return 0;
122	}
123
124	if (!create) {
125		nm_prerr("null ports cannot be re-opened");
126		return EINVAL;
127	}
128
129	if (nmd == NULL) {
130		nm_prerr("null ports must use an existing allocator");
131		return EINVAL;
132	}
133
134	nna = nm_os_malloc(sizeof(*nna));
135	if (nna == NULL) {
136		error = ENOMEM;
137		goto err;
138	}
139	snprintf(nna->up.name, sizeof(nna->up.name), "null:%s", hdr->nr_name);
140
141	nna->up.nm_txsync = netmap_null_sync;
142	nna->up.nm_rxsync = netmap_null_sync;
143	nna->up.nm_register = netmap_null_reg;
144	nna->up.nm_krings_create = netmap_null_krings_create;
145	nna->up.nm_krings_delete = netmap_krings_delete;
146	nna->up.nm_bdg_attach = netmap_null_bdg_attach;
147	nna->up.nm_mem = netmap_mem_get(nmd);
148
149	nna->up.num_tx_rings = req->nr_tx_rings;
150	nna->up.num_rx_rings = req->nr_rx_rings;
151	nna->up.num_tx_desc = req->nr_tx_slots;
152	nna->up.num_rx_desc = req->nr_rx_slots;
153	nna->up.na_flags = NAF_OFFSETS;
154	error = netmap_attach_common(&nna->up);
155	if (error)
156		goto free_nna;
157	*na = &nna->up;
158	netmap_adapter_get(*na);
159	nm_prdis("created null %s", nna->up.name);
160
161	return 0;
162
163free_nna:
164	nm_os_free(nna);
165err:
166	return error;
167}
168
169
170#endif /* WITH_NMNULL */
171