1 /* $NetBSD: if_veth.c,v 1.4 2012/01/15 10:51:12 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2011 Jared D. McNeill <jmcneill@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 1.4 2012/01/15 10:51:12 jmcneill 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_attach(ifp); 141 ether_ifattach(ifp, sc->sc_eaddr); 142 143 ifmedia_init(&sc->sc_ifmedia, 0, 144 veth_ifmedia_change, 145 veth_ifmedia_status); 146 ifmedia_add(&sc->sc_ifmedia, IFM_ETHER|IFM_100_TX, 0, NULL); 147 ifmedia_set(&sc->sc_ifmedia, IFM_ETHER|IFM_100_TX); 148 149 sc->sc_rx_intr = softint_establish(SOFTINT_NET, veth_softrx, sc); 150 if (sc->sc_rx_intr == NULL) 151 panic("couldn't establish veth rx softint"); 152 sc->sc_tx_intr = softint_establish(SOFTINT_NET, veth_softtx, sc); 153 if (sc->sc_tx_intr == NULL) 154 panic("couldn't establish veth tx softint"); 155 156 thunk_setown(sc->sc_tapfd); 157 158 sc->sc_rx_ih = sigio_intr_establish(veth_rx, sc); 159 if (sc->sc_rx_ih == NULL) 160 panic("couldn't establish veth rx interrupt"); 161 } 162 163 static bool 164 veth_shutdown(device_t self, int flags) 165 { 166 struct veth_softc *sc = device_private(self); 167 168 if (sc->sc_tapfd != -1) 169 thunk_close(sc->sc_tapfd); 170 171 return true; 172 } 173 174 static int 175 veth_init(struct ifnet *ifp) 176 { 177 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 178 179 veth_stop(ifp, 0); 180 181 ifp->if_flags |= IFF_RUNNING; 182 ifp->if_flags &= ~IFF_OACTIVE; 183 184 return 0; 185 } 186 187 static int 188 veth_rx(void *priv) 189 { 190 struct veth_softc *sc = priv; 191 192 curcpu()->ci_idepth++; 193 spl_intr(IPL_NET, softint_schedule, sc->sc_rx_intr); 194 curcpu()->ci_idepth--; 195 196 return 0; 197 } 198 199 static void 200 veth_softrx(void *priv) 201 { 202 struct veth_softc *sc = priv; 203 struct ifnet *ifp = &sc->sc_ec.ec_if; 204 struct mbuf *m; 205 ssize_t len; 206 int s, avail; 207 208 for (;;) { 209 avail = thunk_pollin_tap(sc->sc_tapfd, 0); 210 if (avail == 0) 211 break; 212 213 len = thunk_read(sc->sc_tapfd, sc->sc_rx_buf, 214 min(avail, sizeof(sc->sc_rx_buf))); 215 vethprintf("%s: read returned %d\n", __func__, len); 216 if (len == -1) 217 panic("read() from tap failed"); 218 219 MGETHDR(m, M_DONTWAIT, MT_DATA); 220 if (m == NULL) { 221 vethprintf("MGETHDR failed (input error)\n"); 222 ++ifp->if_ierrors; 223 continue; 224 } 225 if (len > MHLEN) { 226 MCLGET(m, M_DONTWAIT); 227 if ((m->m_flags & M_EXT) == 0) { 228 m_freem(m); 229 ++ifp->if_ierrors; 230 vethprintf("M_EXT not set (input error)\n"); 231 continue; 232 } 233 } 234 m->m_pkthdr.rcvif = ifp; 235 m->m_pkthdr.len = m->m_len = len; 236 memcpy(mtod(m, void *), sc->sc_rx_buf, len); 237 ++ifp->if_ipackets; 238 239 bpf_mtap(ifp, m); 240 241 s = splnet(); 242 ifp->if_input(ifp, m); 243 splx(s); 244 } 245 } 246 247 static void 248 veth_softtx(void *priv) 249 { 250 struct veth_softc *sc = priv; 251 struct ifnet *ifp = &sc->sc_ec.ec_if; 252 int s; 253 254 if (ifp->if_flags & IFF_OACTIVE) { 255 if (thunk_pollout_tap(sc->sc_tapfd, 0) == 1) 256 ifp->if_flags &= ~IFF_OACTIVE; 257 } 258 259 s = splnet(); 260 veth_start(ifp); 261 splx(s); 262 } 263 264 static void 265 veth_start(struct ifnet *ifp) 266 { 267 struct veth_softc *sc = ifp->if_softc; 268 struct mbuf *m0; 269 ssize_t len; 270 271 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 272 273 if ((ifp->if_flags & (IFF_RUNNING|IFF_OACTIVE)) != IFF_RUNNING) 274 return; 275 276 for (;;) { 277 IFQ_POLL(&ifp->if_snd, m0); 278 if (m0 == NULL) 279 break; 280 281 if (thunk_pollout_tap(sc->sc_tapfd, 0) != 1) { 282 printf("queue full\n"); 283 ifp->if_flags |= IFF_OACTIVE; 284 break; 285 } 286 287 IFQ_DEQUEUE(&ifp->if_snd, m0); 288 bpf_mtap(ifp, m0); 289 290 m_copydata(m0, 0, m0->m_pkthdr.len, sc->sc_tx_buf); 291 292 vethprintf("write %d bytes...\n", m0->m_pkthdr.len); 293 len = thunk_write(sc->sc_tapfd, sc->sc_tx_buf, 294 m0->m_pkthdr.len); 295 vethprintf("write returned %d\n", len); 296 if (len > 0) 297 ++ifp->if_opackets; 298 else 299 ++ifp->if_oerrors; 300 m_freem(m0); 301 } 302 } 303 304 static void 305 veth_stop(struct ifnet *ifp, int disable) 306 { 307 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 308 ifp->if_timer = 0; 309 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE); 310 } 311 312 static void 313 veth_watchdog(struct ifnet *ifp) 314 { 315 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 316 ++ifp->if_oerrors; 317 veth_init(ifp); 318 } 319 320 static int 321 veth_ioctl(struct ifnet *ifp, u_long cmd, void *data) 322 { 323 struct veth_softc *sc = ifp->if_softc; 324 struct ifreq *ifr; 325 int s, error; 326 327 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 328 329 s = splnet(); 330 331 switch (cmd) { 332 case SIOCSIFMEDIA: 333 case SIOCGIFMEDIA: 334 ifr = data; 335 error = ifmedia_ioctl(ifp, ifr, &sc->sc_ifmedia, cmd); 336 break; 337 case SIOCADDMULTI: 338 case SIOCDELMULTI: 339 if ((error = ether_ioctl(ifp, cmd, data)) == ENETRESET) { 340 if (ifp->if_flags & IFF_RUNNING) { 341 veth_init(ifp); 342 } 343 error = 0; 344 } 345 break; 346 default: 347 error = ether_ioctl(ifp, cmd, data); 348 break; 349 } 350 351 splx(s); 352 return error; 353 } 354 355 static int 356 veth_ifmedia_change(struct ifnet *ifp) 357 { 358 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 359 return 0; 360 } 361 362 static void 363 veth_ifmedia_status(struct ifnet *ifp, struct ifmediareq *req) 364 { 365 vethprintf("%s: %s flags=%x\n", __func__, ifp->if_xname, ifp->if_flags); 366 req->ifm_status |= IFM_ACTIVE | IFM_AVALID; 367 req->ifm_active = IFM_100_TX | IFM_FDX | IFM_ETHER; 368 } 369