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
75 static int
netmap_null_sync(struct netmap_kring * kring,int flags)76 netmap_null_sync(struct netmap_kring *kring, int flags)
77 {
78 (void)kring;
79 (void)flags;
80 return 0;
81 }
82
83 static int
netmap_null_krings_create(struct netmap_adapter * na)84 netmap_null_krings_create(struct netmap_adapter *na)
85 {
86 return netmap_krings_create(na, 0);
87 }
88
89 static int
netmap_null_reg(struct netmap_adapter * na,int onoff)90 netmap_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
101 static int
netmap_null_bdg_attach(const char * name,struct netmap_adapter * na,struct nm_bridge * b)102 netmap_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
111 int
netmap_get_null_na(struct nmreq_header * hdr,struct netmap_adapter ** na,struct netmap_mem_d * nmd,int create)112 netmap_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
163 free_nna:
164 nm_os_free(nna);
165 err:
166 return error;
167 }
168
169
170 #endif /* WITH_NMNULL */
171