if_veth.c revision 1.14
1 /* $NetBSD: if_veth.c,v 1.14 2020/02/05 07:18:16 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2011 Jared D. McNeill <jmcneill (at) invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: if_veth.c,v 1.14 2020/02/05 07:18:16 skrll Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/proc.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/mbuf.h> 37 #include <sys/socket.h> 38 #include <sys/device.h> 39 40 #include <net/if.h> 41 #include <net/if_ether.h> 42 #include <net/if_media.h> 43 44 #include <net/bpf.h> 45 46 #include <machine/mainbus.h> 47 #include <machine/thunk.h> 48 49 static int veth_match(device_t, cfdata_t, void *); 50 static void veth_attach(device_t, device_t, void *); 51 static bool veth_shutdown(device_t, int); 52 53 static int veth_init(struct ifnet *); 54 static void veth_start(struct ifnet *); 55 static void veth_stop(struct ifnet *, int); 56 static void veth_watchdog(struct ifnet *); 57 static int veth_ioctl(struct ifnet *, u_long, void *); 58 59 static int veth_rx(void *); 60 static void veth_softrx(void *); 61 static void veth_softtx(void *); 62 63 static int veth_ifmedia_change(struct ifnet *); 64 static void veth_ifmedia_status(struct ifnet *, struct ifmediareq *); 65 66 #ifdef VETH_DEBUG 67 #define vethprintf printf 68 #else 69 static inline void vethprintf(const char *fmt, ...) { } 70 #endif 71 72 struct veth_softc { 73 device_t sc_dev; 74 struct ethercom sc_ec; 75 struct ifmedia sc_ifmedia; 76 int sc_tapfd; 77 uint8_t sc_eaddr[ETHER_ADDR_LEN]; 78 uint8_t sc_rx_buf[4096 + 65536]; 79 uint8_t sc_tx_buf[4096 + 65536]; 80 void *sc_rx_ih; 81 void *sc_rx_intr; 82 void *sc_tx_intr; 83 }; 84 85 CFATTACH_DECL_NEW(veth, sizeof(struct veth_softc), 86 veth_match, veth_attach, NULL, NULL); 87 88 static int 89 veth_match(device_t parent, cfdata_t match, void *opaque) 90 { 91 struct thunkbus_attach_args *taa = opaque; 92 93 if (taa->taa_type != THUNKBUS_TYPE_VETH) 94 return 0; 95 96 return 1; 97 } 98 99 static void 100 veth_attach(device_t parent, device_t self, void *opaque) 101 { 102 struct veth_softc *sc = device_private(self); 103 struct thunkbus_attach_args *taa = opaque; 104 struct ifnet *ifp = &sc->sc_ec.ec_if; 105 int rv; 106 107 sc->sc_dev = self; 108 109 pmf_device_register1(self, NULL, NULL, veth_shutdown); 110 111 sc->sc_tapfd = thunk_open_tap(taa->u.veth.device); 112 if (sc->sc_tapfd == -1) { 113 aprint_error(": couldn't open %s: %d\n", 114 taa->u.veth.device, thunk_geterrno()); 115 return; 116 } 117 if (ether_aton_r(sc->sc_eaddr, sizeof(sc->sc_eaddr), 118 taa->u.veth.eaddr) != 0) { 119 aprint_error(": couldn't parse hw address '%s'\n", 120 taa->u.veth.eaddr); 121 return; 122 } 123 124 aprint_naive("\n"); 125 aprint_normal(": Virtual Ethernet (device = %s)\n", taa->u.veth.device); 126 127 aprint_normal_dev(self, "Ethernet address %s\n", 128 ether_sprintf(sc->sc_eaddr)); 129 130 strlcpy(ifp->if_xname, device_xname(self), IFNAMSIZ); 131 ifp->if_softc = sc; 132 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 133 ifp->if_ioctl = veth_ioctl; 134 ifp->if_watchdog = veth_watchdog; 135 ifp->if_start = veth_start; 136 ifp->if_init = veth_init; 137 ifp->if_stop = veth_stop; 138 IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN); 139 IFQ_SET_READY(&ifq->if_snd); 140 141 rv = if_initialize(ifp); 142 if (rv != 0) { 143 aprint_error_dev(self, "if_initialize failed(%d)\n", rv); 144 thunk_close(sc->sc_tapfd); 145 pmf_device_deregister(self); 146 return; /* Error */ 147 } 148 ether_ifattach(ifp, sc->sc_eaddr); 149 if_register(ifp); 150 151 /* Initialize ifmedia structures. */ 152 sc->sc_ec.ec_ifmedia = &sc->sc_ifmedia; 153 ifmedia_init(&sc->sc_ifmedia, 0, 154 veth_ifmedia_change, veth_ifmedia_status); 155 ifmedia_add(&sc->sc_ifmedia, IFM_ETHER | IFM_100_TX, 0, NULL); 156 ifmedia_set(&sc->sc_ifmedia, IFM_ETHER | IFM_100_TX); 157 158 sc->sc_rx_intr = softint_establish(SOFTINT_NET, veth_softrx, sc); 159 if (sc->sc_rx_intr == NULL) 160 panic("couldn't establish veth rx softint"); 161 sc->sc_tx_intr = softint_establish(SOFTINT_NET, veth_softtx, sc); 162 if (sc->sc_tx_intr == NULL) 163 panic("couldn't establish veth tx softint"); 164 165 thunk_setown(sc->sc_tapfd); 166 167 sc->sc_rx_ih = sigio_intr_establish(veth_rx, sc); 168 if (sc->sc_rx_ih == NULL) 169 panic("couldn't establish veth rx interrupt"); 170 } 171 172 static bool 173 veth_shutdown(device_t self, int flags) 174 { 175 struct veth_softc *sc = device_private(self); 176 177 if (sc->sc_tapfd != -1) 178 thunk_close(sc->sc_tapfd); 179 180 return true; 181 } 182 183 static int 184 veth_init(struct ifnet *ifp) 185 { 186 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 187 188 veth_stop(ifp, 0); 189 190 ifp->if_flags |= IFF_RUNNING; 191 ifp->if_flags &= ~IFF_OACTIVE; 192 193 return 0; 194 } 195 196 static int 197 veth_rx(void *priv) 198 { 199 struct veth_softc *sc = priv; 200 201 softint_schedule(sc->sc_rx_intr); 202 return 0; 203 } 204 205 static void 206 veth_softrx(void *priv) 207 { 208 struct veth_softc *sc = priv; 209 struct ifnet *ifp = &sc->sc_ec.ec_if; 210 struct mbuf *m; 211 ssize_t len; 212 int s, avail; 213 214 for (;;) { 215 avail = thunk_pollin_tap(sc->sc_tapfd, 0); 216 if (avail == 0) 217 break; 218 219 len = thunk_read(sc->sc_tapfd, sc->sc_rx_buf, 220 uimin(avail, sizeof(sc->sc_rx_buf))); 221 vethprintf("%s: read returned %d\n", __func__, len); 222 if (len == -1) 223 panic("read() from tap failed"); 224 225 MGETHDR(m, M_DONTWAIT, MT_DATA); 226 if (m == NULL) { 227 vethprintf("MGETHDR failed (input error)\n"); 228 if_statinc(ifp, if_ierrors); 229 continue; 230 } 231 if (len > MHLEN) { 232 MCLGET(m, M_DONTWAIT); 233 if ((m->m_flags & M_EXT) == 0) { 234 m_freem(m); 235 if_statinc(ifp, if_ierrors); 236 vethprintf("M_EXT not set (input error)\n"); 237 continue; 238 } 239 } 240 m_set_rcvif(m, ifp); 241 m->m_pkthdr.len = m->m_len = len; 242 memcpy(mtod(m, void *), sc->sc_rx_buf, len); 243 244 s = splnet(); 245 if_input(ifp, m); 246 splx(s); 247 } 248 } 249 250 static void 251 veth_softtx(void *priv) 252 { 253 struct veth_softc *sc = priv; 254 struct ifnet *ifp = &sc->sc_ec.ec_if; 255 int s; 256 257 if (ifp->if_flags & IFF_OACTIVE) { 258 if (thunk_pollout_tap(sc->sc_tapfd, 0) == 1) 259 ifp->if_flags &= ~IFF_OACTIVE; 260 } 261 262 s = splnet(); 263 veth_start(ifp); 264 splx(s); 265 } 266 267 static void 268 veth_start(struct ifnet *ifp) 269 { 270 struct veth_softc *sc = ifp->if_softc; 271 struct mbuf *m0; 272 ssize_t len; 273 274 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 275 276 if ((ifp->if_flags & (IFF_RUNNING | IFF_OACTIVE)) != IFF_RUNNING) 277 return; 278 279 for (;;) { 280 IFQ_POLL(&ifp->if_snd, m0); 281 if (m0 == NULL) 282 break; 283 284 if (thunk_pollout_tap(sc->sc_tapfd, 0) != 1) { 285 printf("queue full\n"); 286 ifp->if_flags |= IFF_OACTIVE; 287 break; 288 } 289 290 IFQ_DEQUEUE(&ifp->if_snd, m0); 291 bpf_mtap(ifp, m0, BPF_D_OUT); 292 293 m_copydata(m0, 0, m0->m_pkthdr.len, sc->sc_tx_buf); 294 295 vethprintf("write %d bytes...\n", m0->m_pkthdr.len); 296 len = thunk_write(sc->sc_tapfd, sc->sc_tx_buf, 297 m0->m_pkthdr.len); 298 vethprintf("write returned %d\n", len); 299 if (len > 0) 300 if_statinc(ifp, if_opackets); 301 else 302 if_statinc(ifp, if_oerrors); 303 m_freem(m0); 304 } 305 } 306 307 static void 308 veth_stop(struct ifnet *ifp, int disable) 309 { 310 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 311 ifp->if_timer = 0; 312 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE); 313 } 314 315 static void 316 veth_watchdog(struct ifnet *ifp) 317 { 318 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 319 if_statinc(ifp, if_oerrors); 320 veth_init(ifp); 321 } 322 323 static int 324 veth_ioctl(struct ifnet *ifp, u_long cmd, void *data) 325 { 326 int s, error; 327 328 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 329 330 s = splnet(); 331 332 switch (cmd) { 333 case SIOCADDMULTI: 334 case SIOCDELMULTI: 335 if ((error = ether_ioctl(ifp, cmd, data)) == ENETRESET) { 336 if (ifp->if_flags & IFF_RUNNING) { 337 veth_init(ifp); 338 } 339 error = 0; 340 } 341 break; 342 default: 343 error = ether_ioctl(ifp, cmd, data); 344 break; 345 } 346 347 splx(s); 348 return error; 349 } 350 351 static int 352 veth_ifmedia_change(struct ifnet *ifp) 353 { 354 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 355 return 0; 356 } 357 358 static void 359 veth_ifmedia_status(struct ifnet *ifp, struct ifmediareq *req) 360 { 361 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 362 req->ifm_status |= IFM_ACTIVE | IFM_AVALID; 363 req->ifm_active = IFM_100_TX | IFM_FDX | IFM_ETHER; 364 } 365
Indexes created Tue Sep 23 02:09:52 GMT 2025