if_veth.c revision 1.15
1 /* $NetBSD: if_veth.c,v 1.15 2021/06/16 00:21:18 riastradh 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 1.15 2021/06/16 00:21:18 riastradh 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; 105 106 sc->sc_dev = self; 107 108 pmf_device_register1(self, NULL, NULL, veth_shutdown); 109 110 sc->sc_tapfd = thunk_open_tap(taa->u.veth.device); 111 if (sc->sc_tapfd == -1) { 112 aprint_error(": couldn't open %s: %d\n", 113 taa->u.veth.device, thunk_geterrno()); 114 return; 115 } 116 if (ether_aton_r(sc->sc_eaddr, sizeof(sc->sc_eaddr), 117 taa->u.veth.eaddr) != 0) { 118 aprint_error(": couldn't parse hw address '%s'\n", 119 taa->u.veth.eaddr); 120 return; 121 } 122 123 aprint_naive("\n"); 124 aprint_normal(": Virtual Ethernet (device = %s)\n", taa->u.veth.device); 125 126 aprint_normal_dev(self, "Ethernet address %s\n", 127 ether_sprintf(sc->sc_eaddr)); 128 129 strlcpy(ifp->if_xname, device_xname(self), IFNAMSIZ); 130 ifp->if_softc = sc; 131 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 132 ifp->if_ioctl = veth_ioctl; 133 ifp->if_watchdog = veth_watchdog; 134 ifp->if_start = veth_start; 135 ifp->if_init = veth_init; 136 ifp->if_stop = veth_stop; 137 IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN); 138 IFQ_SET_READY(&ifq->if_snd); 139 140 if_initialize(ifp); 141 ether_ifattach(ifp, sc->sc_eaddr); 142 if_register(ifp); 143 144 /* Initialize ifmedia structures. */ 145 sc->sc_ec.ec_ifmedia = &sc->sc_ifmedia; 146 ifmedia_init(&sc->sc_ifmedia, 0, 147 veth_ifmedia_change, veth_ifmedia_status); 148 ifmedia_add(&sc->sc_ifmedia, IFM_ETHER | IFM_100_TX, 0, NULL); 149 ifmedia_set(&sc->sc_ifmedia, IFM_ETHER | IFM_100_TX); 150 151 sc->sc_rx_intr = softint_establish(SOFTINT_NET, veth_softrx, sc); 152 if (sc->sc_rx_intr == NULL) 153 panic("couldn't establish veth rx softint"); 154 sc->sc_tx_intr = softint_establish(SOFTINT_NET, veth_softtx, sc); 155 if (sc->sc_tx_intr == NULL) 156 panic("couldn't establish veth tx softint"); 157 158 thunk_setown(sc->sc_tapfd); 159 160 sc->sc_rx_ih = sigio_intr_establish(veth_rx, sc); 161 if (sc->sc_rx_ih == NULL) 162 panic("couldn't establish veth rx interrupt"); 163 } 164 165 static bool 166 veth_shutdown(device_t self, int flags) 167 { 168 struct veth_softc *sc = device_private(self); 169 170 if (sc->sc_tapfd != -1) 171 thunk_close(sc->sc_tapfd); 172 173 return true; 174 } 175 176 static int 177 veth_init(struct ifnet *ifp) 178 { 179 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 180 181 veth_stop(ifp, 0); 182 183 ifp->if_flags |= IFF_RUNNING; 184 ifp->if_flags &= ~IFF_OACTIVE; 185 186 return 0; 187 } 188 189 static int 190 veth_rx(void *priv) 191 { 192 struct veth_softc *sc = priv; 193 194 softint_schedule(sc->sc_rx_intr); 195 return 0; 196 } 197 198 static void 199 veth_softrx(void *priv) 200 { 201 struct veth_softc *sc = priv; 202 struct ifnet *ifp = &sc->sc_ec.ec_if; 203 struct mbuf *m; 204 ssize_t len; 205 int s, avail; 206 207 for (;;) { 208 avail = thunk_pollin_tap(sc->sc_tapfd, 0); 209 if (avail == 0) 210 break; 211 212 len = thunk_read(sc->sc_tapfd, sc->sc_rx_buf, 213 uimin(avail, sizeof(sc->sc_rx_buf))); 214 vethprintf("%s: read returned %d\n", __func__, len); 215 if (len == -1) 216 panic("read() from tap failed"); 217 218 MGETHDR(m, M_DONTWAIT, MT_DATA); 219 if (m == NULL) { 220 vethprintf("MGETHDR failed (input error)\n"); 221 if_statinc(ifp, if_ierrors); 222 continue; 223 } 224 if (len > MHLEN) { 225 MCLGET(m, M_DONTWAIT); 226 if ((m->m_flags & M_EXT) == 0) { 227 m_freem(m); 228 if_statinc(ifp, if_ierrors); 229 vethprintf("M_EXT not set (input error)\n"); 230 continue; 231 } 232 } 233 m_set_rcvif(m, ifp); 234 m->m_pkthdr.len = m->m_len = len; 235 memcpy(mtod(m, void *), sc->sc_rx_buf, len); 236 237 s = splnet(); 238 if_input(ifp, m); 239 splx(s); 240 } 241 } 242 243 static void 244 veth_softtx(void *priv) 245 { 246 struct veth_softc *sc = priv; 247 struct ifnet *ifp = &sc->sc_ec.ec_if; 248 int s; 249 250 if (ifp->if_flags & IFF_OACTIVE) { 251 if (thunk_pollout_tap(sc->sc_tapfd, 0) == 1) 252 ifp->if_flags &= ~IFF_OACTIVE; 253 } 254 255 s = splnet(); 256 veth_start(ifp); 257 splx(s); 258 } 259 260 static void 261 veth_start(struct ifnet *ifp) 262 { 263 struct veth_softc *sc = ifp->if_softc; 264 struct mbuf *m0; 265 ssize_t len; 266 267 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 268 269 if ((ifp->if_flags & (IFF_RUNNING | IFF_OACTIVE)) != IFF_RUNNING) 270 return; 271 272 for (;;) { 273 IFQ_POLL(&ifp->if_snd, m0); 274 if (m0 == NULL) 275 break; 276 277 if (thunk_pollout_tap(sc->sc_tapfd, 0) != 1) { 278 printf("queue full\n"); 279 ifp->if_flags |= IFF_OACTIVE; 280 break; 281 } 282 283 IFQ_DEQUEUE(&ifp->if_snd, m0); 284 bpf_mtap(ifp, m0, BPF_D_OUT); 285 286 m_copydata(m0, 0, m0->m_pkthdr.len, sc->sc_tx_buf); 287 288 vethprintf("write %d bytes...\n", m0->m_pkthdr.len); 289 len = thunk_write(sc->sc_tapfd, sc->sc_tx_buf, 290 m0->m_pkthdr.len); 291 vethprintf("write returned %d\n", len); 292 if (len > 0) 293 if_statinc(ifp, if_opackets); 294 else 295 if_statinc(ifp, if_oerrors); 296 m_freem(m0); 297 } 298 } 299 300 static void 301 veth_stop(struct ifnet *ifp, int disable) 302 { 303 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 304 ifp->if_timer = 0; 305 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE); 306 } 307 308 static void 309 veth_watchdog(struct ifnet *ifp) 310 { 311 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 312 if_statinc(ifp, if_oerrors); 313 veth_init(ifp); 314 } 315 316 static int 317 veth_ioctl(struct ifnet *ifp, u_long cmd, void *data) 318 { 319 int s, error; 320 321 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 322 323 s = splnet(); 324 325 switch (cmd) { 326 case SIOCADDMULTI: 327 case SIOCDELMULTI: 328 if ((error = ether_ioctl(ifp, cmd, data)) == ENETRESET) { 329 if (ifp->if_flags & IFF_RUNNING) { 330 veth_init(ifp); 331 } 332 error = 0; 333 } 334 break; 335 default: 336 error = ether_ioctl(ifp, cmd, data); 337 break; 338 } 339 340 splx(s); 341 return error; 342 } 343 344 static int 345 veth_ifmedia_change(struct ifnet *ifp) 346 { 347 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 348 return 0; 349 } 350 351 static void 352 veth_ifmedia_status(struct ifnet *ifp, struct ifmediareq *req) 353 { 354 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 355 req->ifm_status |= IFM_ACTIVE | IFM_AVALID; 356 req->ifm_active = IFM_100_TX | IFM_FDX | IFM_ETHER; 357 } 358
Indexes created Thu Sep 25 16:09:42 GMT 2025