Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 | /* * USB Network driver infrastructure * Copyright (C) 2000-2005 by David Brownell * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* * This is a generic "USB networking" framework that works with several * kinds of full and high speed networking devices: host-to-host cables, * smart usb peripherals, and actual Ethernet adapters. * * These devices usually differ in terms of control protocols (if they * even have one!) and sometimes they define new framing to wrap or batch * Ethernet packets. Otherwise, they talk to USB pretty much the same, * so interface (un)binding, endpoint I/O queues, fault handling, and other * issues can usefully be addressed by this framework. */ // #define DEBUG // error path messages, extra info // #define VERBOSE // more; success messages #include <linux/module.h> #include <linux/init.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/ctype.h> #include <linux/ethtool.h> #include <linux/workqueue.h> #include <linux/mii.h> #include <linux/usb.h> #include <linux/usb/usbnet.h> #include <linux/slab.h> #include <linux/kernel.h> #include <linux/pm_runtime.h> #define DRIVER_VERSION "22-Aug-2005" /*-------------------------------------------------------------------------*/ /* * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. * Several dozen bytes of IPv4 data can fit in two such transactions. * One maximum size Ethernet packet takes twenty four of them. * For high speed, each frame comfortably fits almost 36 max size * Ethernet packets (so queues should be bigger). * * REVISIT qlens should be members of 'struct usbnet'; the goal is to * let the USB host controller be busy for 5msec or more before an irq * is required, under load. Jumbograms change the equation. */ #define RX_MAX_QUEUE_MEMORY (60 * 1518) #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \ (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4) #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \ (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4) // reawaken network queue this soon after stopping; else watchdog barks #define TX_TIMEOUT_JIFFIES (5*HZ) // throttle rx/tx briefly after some faults, so khubd might disconnect() // us (it polls at HZ/4 usually) before we report too many false errors. #define THROTTLE_JIFFIES (HZ/8) // between wakeups #define UNLINK_TIMEOUT_MS 3 /*-------------------------------------------------------------------------*/ // randomly generated ethernet address static u8 node_id [ETH_ALEN]; static const char driver_name [] = "usbnet"; /* use ethtool to change the level for any given device */ static int msg_level = -1; module_param (msg_level, int, 0); MODULE_PARM_DESC (msg_level, "Override default message level"); /*-------------------------------------------------------------------------*/ /* handles CDC Ethernet and many other network "bulk data" interfaces */ int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) { int tmp; struct usb_host_interface *alt = NULL; struct usb_host_endpoint *in = NULL, *out = NULL; struct usb_host_endpoint *status = NULL; for (tmp = 0; tmp < intf->num_altsetting; tmp++) { unsigned ep; in = out = status = NULL; alt = intf->altsetting + tmp; /* take the first altsetting with in-bulk + out-bulk; * remember any status endpoint, just in case; * ignore other endpoints and altsettings. */ for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { struct usb_host_endpoint *e; int intr = 0; e = alt->endpoint + ep; switch (e->desc.bmAttributes) { case USB_ENDPOINT_XFER_INT: if (!usb_endpoint_dir_in(&e->desc)) continue; intr = 1; /* FALLTHROUGH */ case USB_ENDPOINT_XFER_BULK: break; default: continue; } if (usb_endpoint_dir_in(&e->desc)) { if (!intr && !in) in = e; else if (intr && !status) status = e; } else { if (!out) out = e; } } if (in && out) break; } if (!alt || !in || !out) return -EINVAL; if (alt->desc.bAlternateSetting != 0 || !(dev->driver_info->flags & FLAG_NO_SETINT)) { tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, alt->desc.bAlternateSetting); if (tmp < 0) return tmp; } dev->in = usb_rcvbulkpipe (dev->udev, in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); dev->out = usb_sndbulkpipe (dev->udev, out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); dev->status = status; return 0; } EXPORT_SYMBOL_GPL(usbnet_get_endpoints); int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) { int tmp, i; unsigned char buf [13]; tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf); if (tmp != 12) { dev_dbg(&dev->udev->dev, "bad MAC string %d fetch, %d\n", iMACAddress, tmp); if (tmp >= 0) tmp = -EINVAL; return tmp; } for (i = tmp = 0; i < 6; i++, tmp += 2) dev->net->dev_addr [i] = (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]); return 0; } EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); static void intr_complete (struct urb *urb); static int init_status (struct usbnet *dev, struct usb_interface *intf) { char *buf = NULL; unsigned pipe = 0; unsigned maxp; unsigned period; if (!dev->driver_info->status) return 0; pipe = usb_rcvintpipe (dev->udev, dev->status->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); maxp = usb_maxpacket (dev->udev, pipe, 0); /* avoid 1 msec chatter: min 8 msec poll rate */ period = max ((int) dev->status->desc.bInterval, (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); buf = kmalloc (maxp, GFP_KERNEL); if (buf) { dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); if (!dev->interrupt) { kfree (buf); return -ENOMEM; } else { usb_fill_int_urb(dev->interrupt, dev->udev, pipe, buf, maxp, intr_complete, dev, period); dev_dbg(&intf->dev, "status ep%din, %d bytes period %d\n", usb_pipeendpoint(pipe), maxp, period); } } return 0; } /* Passes this packet up the stack, updating its accounting. * Some link protocols batch packets, so their rx_fixup paths * can return clones as well as just modify the original skb. */ void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) { int status; if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { skb_queue_tail(&dev->rxq_pause, skb); return; } skb->protocol = eth_type_trans (skb, dev->net); dev->net->stats.rx_packets++; dev->net->stats.rx_bytes += skb->len; netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", skb->len + sizeof (struct ethhdr), skb->protocol); memset (skb->cb, 0, sizeof (struct skb_data)); if (skb_defer_rx_timestamp(skb)) return; status = netif_rx (skb); if (status != NET_RX_SUCCESS) netif_dbg(dev, rx_err, dev->net, "netif_rx status %d\n", status); } EXPORT_SYMBOL_GPL(usbnet_skb_return); /*------------------------------------------------------------------------- * * Network Device Driver (peer link to "Host Device", from USB host) * *-------------------------------------------------------------------------*/ int usbnet_change_mtu (struct net_device *net, int new_mtu) { struct usbnet *dev = netdev_priv(net); int ll_mtu = new_mtu + net->hard_header_len; int old_hard_mtu = dev->hard_mtu; int old_rx_urb_size = dev->rx_urb_size; if (new_mtu <= 0) return -EINVAL; // no second zero-length packet read wanted after mtu-sized packets if ((ll_mtu % dev->maxpacket) == 0) return -EDOM; net->mtu = new_mtu; dev->hard_mtu = net->mtu + net->hard_header_len; if (dev->rx_urb_size == old_hard_mtu) { dev->rx_urb_size = dev->hard_mtu; if (dev->rx_urb_size > old_rx_urb_size) usbnet_unlink_rx_urbs(dev); } return 0; } EXPORT_SYMBOL_GPL(usbnet_change_mtu); /*-------------------------------------------------------------------------*/ /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from * completion callbacks. 2.5 should have fixed those bugs... */ static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list) { unsigned long flags; spin_lock_irqsave(&list->lock, flags); __skb_unlink(skb, list); spin_unlock(&list->lock); spin_lock(&dev->done.lock); __skb_queue_tail(&dev->done, skb); if (dev->done.qlen == 1) tasklet_schedule(&dev->bh); spin_unlock_irqrestore(&dev->done.lock, flags); } /* some work can't be done in tasklets, so we use keventd * * NOTE: annoying asymmetry: if it's active, schedule_work() fails, * but tasklet_schedule() doesn't. hope the failure is rare. */ void usbnet_defer_kevent (struct usbnet *dev, int work) { set_bit (work, &dev->flags); if (!schedule_work (&dev->kevent)) netdev_err(dev->net, "kevent %d may have been dropped\n", work); else netdev_dbg(dev->net, "kevent %d scheduled\n", work); } EXPORT_SYMBOL_GPL(usbnet_defer_kevent); /*-------------------------------------------------------------------------*/ static void rx_complete (struct urb *urb); static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) { struct sk_buff *skb; struct skb_data *entry; int retval = 0; unsigned long lockflags; size_t size = dev->rx_urb_size; skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); if (!skb) { netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); usbnet_defer_kevent (dev, EVENT_RX_MEMORY); usb_free_urb (urb); return -ENOMEM; } entry = (struct skb_data *) skb->cb; entry->urb = urb; entry->dev = dev; entry->state = rx_start; entry->length = 0; usb_fill_bulk_urb (urb, dev->udev, dev->in, skb->data, size, rx_complete, skb); spin_lock_irqsave (&dev->rxq.lock, lockflags); if (netif_running (dev->net) && netif_device_present (dev->net) && !test_bit (EVENT_RX_HALT, &dev->flags) && !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { case -EPIPE: usbnet_defer_kevent (dev, EVENT_RX_HALT); break; case -ENOMEM: usbnet_defer_kevent (dev, EVENT_RX_MEMORY); break; case -ENODEV: netif_dbg(dev, ifdown, dev->net, "device gone\n"); netif_device_detach (dev->net); break; case -EHOSTUNREACH: retval = -ENOLINK; break; default: netif_dbg(dev, rx_err, dev->net, "rx submit, %d\n", retval); tasklet_schedule (&dev->bh); break; case 0: __skb_queue_tail (&dev->rxq, skb); } } else { netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); retval = -ENOLINK; } spin_unlock_irqrestore (&dev->rxq.lock, lockflags); if (retval) { dev_kfree_skb_any (skb); usb_free_urb (urb); } return retval; } /*-------------------------------------------------------------------------*/ static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) { if (dev->driver_info->rx_fixup && !dev->driver_info->rx_fixup (dev, skb)) { /* With RX_ASSEMBLE, rx_fixup() must update counters */ if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) dev->net->stats.rx_errors++; goto done; } // else network stack removes extra byte if we forced a short packet if (skb->len) { /* all data was already cloned from skb inside the driver */ if (dev->driver_info->flags & FLAG_MULTI_PACKET) dev_kfree_skb_any(skb); else usbnet_skb_return(dev, skb); return; } netif_dbg(dev, rx_err, dev->net, "drop\n"); dev->net->stats.rx_errors++; done: skb_queue_tail(&dev->done, skb); } /*-------------------------------------------------------------------------*/ static void rx_complete (struct urb *urb) { struct sk_buff *skb = (struct sk_buff *) urb->context; struct skb_data *entry = (struct skb_data *) skb->cb; struct usbnet *dev = entry->dev; int urb_status = urb->status; skb_put (skb, urb->actual_length); entry->state = rx_done; entry->urb = NULL; switch (urb_status) { /* success */ case 0: if (skb->len < dev->net->hard_header_len) { entry->state = rx_cleanup; dev->net->stats.rx_errors++; dev->net->stats.rx_length_errors++; netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len); } break; /* stalls need manual reset. this is rare ... except that * when going through USB 2.0 TTs, unplug appears this way. * we avoid the highspeed version of the ETIMEDOUT/EILSEQ * storm, recovering as needed. */ case -EPIPE: dev->net->stats.rx_errors++; usbnet_defer_kevent (dev, EVENT_RX_HALT); // FALLTHROUGH /* software-driven interface shutdown */ case -ECONNRESET: /* async unlink */ case -ESHUTDOWN: /* hardware gone */ netif_dbg(dev, ifdown, dev->net, "rx shutdown, code %d\n", urb_status); goto block; /* we get controller i/o faults during khubd disconnect() delays. * throttle down resubmits, to avoid log floods; just temporarily, * so we still recover when the fault isn't a khubd delay. */ case -EPROTO: case -ETIME: case -EILSEQ: dev->net->stats.rx_errors++; if (!timer_pending (&dev->delay)) { mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); netif_dbg(dev, link, dev->net, "rx throttle %d\n", urb_status); } block: entry->state = rx_cleanup; entry->urb = urb; urb = NULL; break; /* data overrun ... flush fifo? */ case -EOVERFLOW: dev->net->stats.rx_over_errors++; // FALLTHROUGH default: entry->state = rx_cleanup; dev->net->stats.rx_errors++; netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); break; } defer_bh(dev, skb, &dev->rxq); if (urb) { if (netif_running (dev->net) && !test_bit (EVENT_RX_HALT, &dev->flags)) { rx_submit (dev, urb, GFP_ATOMIC); usb_mark_last_busy(dev->udev); return; } usb_free_urb (urb); } netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); } static void intr_complete (struct urb *urb) { struct usbnet *dev = urb->context; int status = urb->status; switch (status) { /* success */ case 0: dev->driver_info->status(dev, urb); break; /* software-driven interface shutdown */ case -ENOENT: /* urb killed */ case -ESHUTDOWN: /* hardware gone */ netif_dbg(dev, ifdown, dev->net, "intr shutdown, code %d\n", status); return; /* NOTE: not throttling like RX/TX, since this endpoint * already polls infrequently */ default: netdev_dbg(dev->net, "intr status %d\n", status); break; } if (!netif_running (dev->net)) return; memset(urb->transfer_buffer, 0, urb->transfer_buffer_length); status = usb_submit_urb (urb, GFP_ATOMIC); if (status != 0) netif_err(dev, timer, dev->net, "intr resubmit --> %d\n", status); } /*-------------------------------------------------------------------------*/ void usbnet_pause_rx(struct usbnet *dev) { set_bit(EVENT_RX_PAUSED, &dev->flags); netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); } EXPORT_SYMBOL_GPL(usbnet_pause_rx); void usbnet_resume_rx(struct usbnet *dev) { struct sk_buff *skb; int num = 0; clear_bit(EVENT_RX_PAUSED, &dev->flags); while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { usbnet_skb_return(dev, skb); num++; } tasklet_schedule(&dev->bh); netif_dbg(dev, rx_status, dev->net, "paused rx queue disabled, %d skbs requeued\n", num); } EXPORT_SYMBOL_GPL(usbnet_resume_rx); void usbnet_purge_paused_rxq(struct usbnet *dev) { skb_queue_purge(&dev->rxq_pause); } EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); /*-------------------------------------------------------------------------*/ // unlink pending rx/tx; completion handlers do all other cleanup static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) { unsigned long flags; struct sk_buff *skb, *skbnext; int count = 0; spin_lock_irqsave (&q->lock, flags); skb_queue_walk_safe(q, skb, skbnext) { struct skb_data *entry; struct urb *urb; int retval; entry = (struct skb_data *) skb->cb; urb = entry->urb; /* * Get reference count of the URB to avoid it to be * freed during usb_unlink_urb, which may trigger * use-after-free problem inside usb_unlink_urb since * usb_unlink_urb is always racing with .complete * handler(include defer_bh). */ usb_get_urb(urb); spin_unlock_irqrestore(&q->lock, flags); // during some PM-driven resume scenarios, // these (async) unlinks complete immediately retval = usb_unlink_urb (urb); if (retval != -EINPROGRESS && retval != 0) netdev_dbg(dev->net, "unlink urb err, %d\n", retval); else count++; usb_put_urb(urb); spin_lock_irqsave(&q->lock, flags); } spin_unlock_irqrestore (&q->lock, flags); return count; } // Flush all pending rx urbs // minidrivers may need to do this when the MTU changes void usbnet_unlink_rx_urbs(struct usbnet *dev) { if (netif_running(dev->net)) { (void) unlink_urbs (dev, &dev->rxq); tasklet_schedule(&dev->bh); } } EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); /*-------------------------------------------------------------------------*/ // precondition: never called in_interrupt static void usbnet_terminate_urbs(struct usbnet *dev) { DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup); DECLARE_WAITQUEUE(wait, current); int temp; /* ensure there are no more active urbs */ add_wait_queue(&unlink_wakeup, &wait); set_current_state(TASK_UNINTERRUPTIBLE); dev->wait = &unlink_wakeup; temp = unlink_urbs(dev, &dev->txq) + unlink_urbs(dev, &dev->rxq); /* maybe wait for deletions to finish. */ while (!skb_queue_empty(&dev->rxq) && !skb_queue_empty(&dev->txq) && !skb_queue_empty(&dev->done)) { schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); set_current_state(TASK_UNINTERRUPTIBLE); netif_dbg(dev, ifdown, dev->net, "waited for %d urb completions\n", temp); } set_current_state(TASK_RUNNING); dev->wait = NULL; remove_wait_queue(&unlink_wakeup, &wait); } int usbnet_stop (struct net_device *net) { struct usbnet *dev = netdev_priv(net); struct driver_info *info = dev->driver_info; int retval; clear_bit(EVENT_DEV_OPEN, &dev->flags); netif_stop_queue (net); netif_info(dev, ifdown, dev->net, "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", net->stats.rx_packets, net->stats.tx_packets, net->stats.rx_errors, net->stats.tx_errors); /* allow minidriver to stop correctly (wireless devices to turn off * radio etc) */ if (info->stop) { retval = info->stop(dev); if (retval < 0) netif_info(dev, ifdown, dev->net, "stop fail (%d) usbnet usb-%s-%s, %s\n", retval, dev->udev->bus->bus_name, dev->udev->devpath, info->description); } if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) usbnet_terminate_urbs(dev); usb_kill_urb(dev->interrupt); usbnet_purge_paused_rxq(dev); /* deferred work (task, timer, softirq) must also stop. * can't flush_scheduled_work() until we drop rtnl (later), * else workers could deadlock; so make workers a NOP. */ dev->flags = 0; del_timer_sync (&dev->delay); tasklet_kill (&dev->bh); if (info->manage_power) info->manage_power(dev, 0); else usb_autopm_put_interface(dev->intf); return 0; } EXPORT_SYMBOL_GPL(usbnet_stop); /*-------------------------------------------------------------------------*/ // posts reads, and enables write queuing // precondition: never called in_interrupt int usbnet_open (struct net_device *net) { struct usbnet *dev = netdev_priv(net); int retval; struct driver_info *info = dev->driver_info; if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { netif_info(dev, ifup, dev->net, "resumption fail (%d) usbnet usb-%s-%s, %s\n", retval, dev->udev->bus->bus_name, dev->udev->devpath, info->description); goto done_nopm; } // put into "known safe" state if (info->reset && (retval = info->reset (dev)) < 0) { netif_info(dev, ifup, dev->net, "open reset fail (%d) usbnet usb-%s-%s, %s\n", retval, dev->udev->bus->bus_name, dev->udev->devpath, info->description); goto done; } // insist peer be connected if (info->check_connect && (retval = info->check_connect (dev)) < 0) { netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); goto done; } /* start any status interrupt transfer */ if (dev->interrupt) { retval = usb_submit_urb (dev->interrupt, GFP_KERNEL); if (retval < 0) { netif_err(dev, ifup, dev->net, "intr submit %d\n", retval); goto done; } } set_bit(EVENT_DEV_OPEN, &dev->flags); netif_start_queue (net); netif_info(dev, ifup, dev->net, "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", (int)RX_QLEN(dev), (int)TX_QLEN(dev), dev->net->mtu, (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : "simple"); // delay posting reads until we're fully open tasklet_schedule (&dev->bh); if (info->manage_power) { retval = info->manage_power(dev, 1); if (retval < 0) goto done; usb_autopm_put_interface(dev->intf); } return retval; done: usb_autopm_put_interface(dev->intf); done_nopm: return retval; } EXPORT_SYMBOL_GPL(usbnet_open); /*-------------------------------------------------------------------------*/ /* ethtool methods; minidrivers may need to add some more, but * they'll probably want to use this base set. */ int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) { struct usbnet *dev = netdev_priv(net); if (!dev->mii.mdio_read) return -EOPNOTSUPP; return mii_ethtool_gset(&dev->mii, cmd); } EXPORT_SYMBOL_GPL(usbnet_get_settings); int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) { struct usbnet *dev = netdev_priv(net); int retval; if (!dev->mii.mdio_write) return -EOPNOTSUPP; retval = mii_ethtool_sset(&dev->mii, cmd); /* link speed/duplex might have changed */ if (dev->driver_info->link_reset) dev->driver_info->link_reset(dev); return retval; } EXPORT_SYMBOL_GPL(usbnet_set_settings); u32 usbnet_get_link (struct net_device *net) { struct usbnet *dev = netdev_priv(net); /* If a check_connect is defined, return its result */ if (dev->driver_info->check_connect) return dev->driver_info->check_connect (dev) == 0; /* if the device has mii operations, use those */ if (dev->mii.mdio_read) return mii_link_ok(&dev->mii); /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ return ethtool_op_get_link(net); } EXPORT_SYMBOL_GPL(usbnet_get_link); int usbnet_nway_reset(struct net_device *net) { struct usbnet *dev = netdev_priv(net); if (!dev->mii.mdio_write) return -EOPNOTSUPP; return mii_nway_restart(&dev->mii); } EXPORT_SYMBOL_GPL(usbnet_nway_reset); void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) { struct usbnet *dev = netdev_priv(net); strncpy (info->driver, dev->driver_name, sizeof info->driver); strncpy (info->version, DRIVER_VERSION, sizeof info->version); strncpy (info->fw_version, dev->driver_info->description, sizeof info->fw_version); usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); } EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); u32 usbnet_get_msglevel (struct net_device *net) { struct usbnet *dev = netdev_priv(net); return dev->msg_enable; } EXPORT_SYMBOL_GPL(usbnet_get_msglevel); void usbnet_set_msglevel (struct net_device *net, u32 level) { struct usbnet *dev = netdev_priv(net); dev->msg_enable = level; } EXPORT_SYMBOL_GPL(usbnet_set_msglevel); /* drivers may override default ethtool_ops in their bind() routine */ static const struct ethtool_ops usbnet_ethtool_ops = { .get_settings = usbnet_get_settings, .set_settings = usbnet_set_settings, .get_link = usbnet_get_link, .nway_reset = usbnet_nway_reset, .get_drvinfo = usbnet_get_drvinfo, .get_msglevel = usbnet_get_msglevel, .set_msglevel = usbnet_set_msglevel, }; /*-------------------------------------------------------------------------*/ /* work that cannot be done in interrupt context uses keventd. * * NOTE: with 2.5 we could do more of this using completion callbacks, * especially now that control transfers can be queued. */ static void kevent (struct work_struct *work) { struct usbnet *dev = container_of(work, struct usbnet, kevent); int status; /* usb_clear_halt() needs a thread context */ if (test_bit (EVENT_TX_HALT, &dev->flags)) { unlink_urbs (dev, &dev->txq); status = usb_autopm_get_interface(dev->intf); if (status < 0) goto fail_pipe; status = usb_clear_halt (dev->udev, dev->out); usb_autopm_put_interface(dev->intf); if (status < 0 && status != -EPIPE && status != -ESHUTDOWN) { if (netif_msg_tx_err (dev)) fail_pipe: netdev_err(dev->net, "can't clear tx halt, status %d\n", status); } else { clear_bit (EVENT_TX_HALT, &dev->flags); if (status != -ESHUTDOWN) netif_wake_queue (dev->net); } } if (test_bit (EVENT_RX_HALT, &dev->flags)) { unlink_urbs (dev, &dev->rxq); status = usb_autopm_get_interface(dev->intf); if (status < 0) goto fail_halt; status = usb_clear_halt (dev->udev, dev->in); usb_autopm_put_interface(dev->intf); if (status < 0 && status != -EPIPE && status != -ESHUTDOWN) { if (netif_msg_rx_err (dev)) fail_halt: netdev_err(dev->net, "can't clear rx halt, status %d\n", status); } else { clear_bit (EVENT_RX_HALT, &dev->flags); tasklet_schedule (&dev->bh); } } /* tasklet could resubmit itself forever if memory is tight */ if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { struct urb *urb = NULL; int resched = 1; if (netif_running (dev->net)) urb = usb_alloc_urb (0, GFP_KERNEL); else clear_bit (EVENT_RX_MEMORY, &dev->flags); if (urb != NULL) { clear_bit (EVENT_RX_MEMORY, &dev->flags); status = usb_autopm_get_interface(dev->intf); if (status < 0) { usb_free_urb(urb); goto fail_lowmem; } if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) resched = 0; usb_autopm_put_interface(dev->intf); fail_lowmem: if (resched) tasklet_schedule (&dev->bh); } } if (test_bit (EVENT_LINK_RESET, &dev->flags)) { struct driver_info *info = dev->driver_info; int retval = 0; clear_bit (EVENT_LINK_RESET, &dev->flags); status = usb_autopm_get_interface(dev->intf); if (status < 0) goto skip_reset; if(info->link_reset && (retval = info->link_reset(dev)) < 0) { usb_autopm_put_interface(dev->intf); skip_reset: netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", retval, dev->udev->bus->bus_name, dev->udev->devpath, info->description); } else { usb_autopm_put_interface(dev->intf); } } if (dev->flags) netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); } /*-------------------------------------------------------------------------*/ static void tx_complete (struct urb *urb) { struct sk_buff *skb = (struct sk_buff *) urb->context; struct skb_data *entry = (struct skb_data *) skb->cb; struct usbnet *dev = entry->dev; if (urb->status == 0) { if (!(dev->driver_info->flags & FLAG_MULTI_PACKET)) dev->net->stats.tx_packets++; dev->net->stats.tx_bytes += entry->length; } else { dev->net->stats.tx_errors++; switch (urb->status) { case -EPIPE: usbnet_defer_kevent (dev, EVENT_TX_HALT); break; /* software-driven interface shutdown */ case -ECONNRESET: // async unlink case -ESHUTDOWN: // hardware gone break; // like rx, tx gets controller i/o faults during khubd delays // and so it uses the same throttling mechanism. case -EPROTO: case -ETIME: case -EILSEQ: usb_mark_last_busy(dev->udev); if (!timer_pending (&dev->delay)) { mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); netif_dbg(dev, link, dev->net, "tx throttle %d\n", urb->status); } netif_stop_queue (dev->net); break; default: netif_dbg(dev, tx_err, dev->net, "tx err %d\n", entry->urb->status); break; } } usb_autopm_put_interface_async(dev->intf); entry->state = tx_done; defer_bh(dev, skb, &dev->txq); } /*-------------------------------------------------------------------------*/ void usbnet_tx_timeout (struct net_device *net) { struct usbnet *dev = netdev_priv(net); unlink_urbs (dev, &dev->txq); tasklet_schedule (&dev->bh); // FIXME: device recovery -- reset? } EXPORT_SYMBOL_GPL(usbnet_tx_timeout); /*-------------------------------------------------------------------------*/ netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, struct net_device *net) { struct usbnet *dev = netdev_priv(net); int length; struct urb *urb = NULL; struct skb_data *entry; struct driver_info *info = dev->driver_info; unsigned long flags; int retval; if (skb) skb_tx_timestamp(skb); // some devices want funky USB-level framing, for // win32 driver (usually) and/or hardware quirks if (info->tx_fixup) { skb = info->tx_fixup (dev, skb, GFP_ATOMIC); if (!skb) { if (netif_msg_tx_err(dev)) { netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); goto drop; } else { /* cdc_ncm collected packet; waits for more */ goto not_drop; } } } length = skb->len; if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { netif_dbg(dev, tx_err, dev->net, "no urb\n"); goto drop; } entry = (struct skb_data *) skb->cb; entry->urb = urb; entry->dev = dev; entry->state = tx_start; entry->length = length; usb_fill_bulk_urb (urb, dev->udev, dev->out, skb->data, skb->len, tx_complete, skb); /* don't assume the hardware handles USB_ZERO_PACKET * NOTE: strictly conforming cdc-ether devices should expect * the ZLP here, but ignore the one-byte packet. * NOTE2: CDC NCM specification is different from CDC ECM when * handling ZLP/short packets, so cdc_ncm driver will make short * packet itself if needed. */ if (length % dev->maxpacket == 0) { if (!(info->flags & FLAG_SEND_ZLP)) { if (!(info->flags & FLAG_MULTI_PACKET)) { urb->transfer_buffer_length++; if (skb_tailroom(skb)) { skb->data[skb->len] = 0; __skb_put(skb, 1); } } } else urb->transfer_flags |= URB_ZERO_PACKET; } spin_lock_irqsave(&dev->txq.lock, flags); retval = usb_autopm_get_interface_async(dev->intf); if (retval < 0) { spin_unlock_irqrestore(&dev->txq.lock, flags); goto drop; } #ifdef CONFIG_PM /* if this triggers the device is still a sleep */ if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { /* transmission will be done in resume */ usb_anchor_urb(urb, &dev->deferred); /* no use to process more packets */ netif_stop_queue(net); spin_unlock_irqrestore(&dev->txq.lock, flags); netdev_dbg(dev->net, "Delaying transmission for resumption\n"); goto deferred; } #endif switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { case -EPIPE: netif_stop_queue (net); usbnet_defer_kevent (dev, EVENT_TX_HALT); usb_autopm_put_interface_async(dev->intf); break; default: usb_autopm_put_interface_async(dev->intf); netif_dbg(dev, tx_err, dev->net, "tx: submit urb err %d\n", retval); break; case 0: net->trans_start = jiffies; __skb_queue_tail (&dev->txq, skb); if (dev->txq.qlen >= TX_QLEN (dev)) netif_stop_queue (net); } spin_unlock_irqrestore (&dev->txq.lock, flags); if (retval) { netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); drop: dev->net->stats.tx_dropped++; not_drop: if (skb) dev_kfree_skb_any (skb); usb_free_urb (urb); } else netif_dbg(dev, tx_queued, dev->net, "> tx, len %d, type 0x%x\n", length, skb->protocol); #ifdef CONFIG_PM deferred: #endif return NETDEV_TX_OK; } EXPORT_SYMBOL_GPL(usbnet_start_xmit); /*-------------------------------------------------------------------------*/ // tasklet (work deferred from completions, in_irq) or timer static void usbnet_bh (unsigned long param) { struct usbnet *dev = (struct usbnet *) param; struct sk_buff *skb; struct skb_data *entry; while ((skb = skb_dequeue (&dev->done))) { entry = (struct skb_data *) skb->cb; switch (entry->state) { case rx_done: entry->state = rx_cleanup; rx_process (dev, skb); continue; case tx_done: case rx_cleanup: usb_free_urb (entry->urb); dev_kfree_skb (skb); continue; default: netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); } } // waiting for all pending urbs to complete? if (dev->wait) { if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { wake_up (dev->wait); } // or are we maybe short a few urbs? } else if (netif_running (dev->net) && netif_device_present (dev->net) && !timer_pending (&dev->delay) && !test_bit (EVENT_RX_HALT, &dev->flags)) { int temp = dev->rxq.qlen; int qlen = RX_QLEN (dev); if (temp < qlen) { struct urb *urb; int i; // don't refill the queue all at once for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) { urb = usb_alloc_urb (0, GFP_ATOMIC); if (urb != NULL) { if (rx_submit (dev, urb, GFP_ATOMIC) == -ENOLINK) return; } } if (temp != dev->rxq.qlen) netif_dbg(dev, link, dev->net, "rxqlen %d --> %d\n", temp, dev->rxq.qlen); if (dev->rxq.qlen < qlen) tasklet_schedule (&dev->bh); } if (dev->txq.qlen < TX_QLEN (dev)) netif_wake_queue (dev->net); } } /*------------------------------------------------------------------------- * * USB Device Driver support * *-------------------------------------------------------------------------*/ // precondition: never called in_interrupt void usbnet_disconnect (struct usb_interface *intf) { struct usbnet *dev; struct usb_device *xdev; struct net_device *net; dev = usb_get_intfdata(intf); usb_set_intfdata(intf, NULL); if (!dev) return; xdev = interface_to_usbdev (intf); netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", intf->dev.driver->name, xdev->bus->bus_name, xdev->devpath, dev->driver_info->description); net = dev->net; unregister_netdev (net); cancel_work_sync(&dev->kevent); if (dev->driver_info->unbind) dev->driver_info->unbind (dev, intf); usb_kill_urb(dev->interrupt); usb_free_urb(dev->interrupt); free_netdev(net); usb_put_dev (xdev); } EXPORT_SYMBOL_GPL(usbnet_disconnect); static const struct net_device_ops usbnet_netdev_ops = { .ndo_open = usbnet_open, .ndo_stop = usbnet_stop, .ndo_start_xmit = usbnet_start_xmit, .ndo_tx_timeout = usbnet_tx_timeout, .ndo_change_mtu = usbnet_change_mtu, .ndo_set_mac_address = eth_mac_addr, .ndo_validate_addr = eth_validate_addr, }; /*-------------------------------------------------------------------------*/ // precondition: never called in_interrupt static struct device_type wlan_type = { .name = "wlan", }; static struct device_type wwan_type = { .name = "wwan", }; int usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) { struct usbnet *dev; struct net_device *net; struct usb_host_interface *interface; struct driver_info *info; struct usb_device *xdev; int status; const char *name; struct usb_driver *driver = to_usb_driver(udev->dev.driver); /* usbnet already took usb runtime pm, so have to enable the feature * for usb interface, otherwise usb_autopm_get_interface may return * failure if USB_SUSPEND(RUNTIME_PM) is enabled. */ if (!driver->supports_autosuspend) { driver->supports_autosuspend = 1; pm_runtime_enable(&udev->dev); } name = udev->dev.driver->name; info = (struct driver_info *) prod->driver_info; if (!info) { dev_dbg (&udev->dev, "blacklisted by %s\n", name); return -ENODEV; } xdev = interface_to_usbdev (udev); interface = udev->cur_altsetting; usb_get_dev (xdev); status = -ENOMEM; // set up our own records net = alloc_etherdev(sizeof(*dev)); if (!net) goto out; /* netdev_printk() needs this so do it as early as possible */ SET_NETDEV_DEV(net, &udev->dev); dev = netdev_priv(net); dev->udev = xdev; dev->intf = udev; dev->driver_info = info; dev->driver_name = name; dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK); skb_queue_head_init (&dev->rxq); skb_queue_head_init (&dev->txq); skb_queue_head_init (&dev->done); skb_queue_head_init(&dev->rxq_pause); dev->bh.func = usbnet_bh; dev->bh.data = (unsigned long) dev; INIT_WORK (&dev->kevent, kevent); init_usb_anchor(&dev->deferred); dev->delay.function = usbnet_bh; dev->delay.data = (unsigned long) dev; init_timer (&dev->delay); mutex_init (&dev->phy_mutex); dev->net = net; strcpy (net->name, "usb%d"); memcpy (net->dev_addr, node_id, sizeof node_id); /* rx and tx sides can use different message sizes; * bind() should set rx_urb_size in that case. */ dev->hard_mtu = net->mtu + net->hard_header_len; #if 0 // dma_supported() is deeply broken on almost all architectures // possible with some EHCI controllers if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) net->features |= NETIF_F_HIGHDMA; #endif net->netdev_ops = &usbnet_netdev_ops; net->watchdog_timeo = TX_TIMEOUT_JIFFIES; net->ethtool_ops = &usbnet_ethtool_ops; // allow device-specific bind/init procedures // NOTE net->name still not usable ... if (info->bind) { status = info->bind (dev, udev); if (status < 0) goto out1; // heuristic: "usb%d" for links we know are two-host, // else "eth%d" when there's reasonable doubt. userspace // can rename the link if it knows better. if ((dev->driver_info->flags & FLAG_ETHER) != 0 && ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || (net->dev_addr [0] & 0x02) == 0)) strcpy (net->name, "eth%d"); /* WLAN devices should always be named "wlan%d" */ if ((dev->driver_info->flags & FLAG_WLAN) != 0) strcpy(net->name, "wlan%d"); /* WWAN devices should always be named "wwan%d" */ if ((dev->driver_info->flags & FLAG_WWAN) != 0) strcpy(net->name, "wwan%d"); /* maybe the remote can't receive an Ethernet MTU */ if (net->mtu > (dev->hard_mtu - net->hard_header_len)) net->mtu = dev->hard_mtu - net->hard_header_len; } else if (!info->in || !info->out) status = usbnet_get_endpoints (dev, udev); else { dev->in = usb_rcvbulkpipe (xdev, info->in); dev->out = usb_sndbulkpipe (xdev, info->out); if (!(info->flags & FLAG_NO_SETINT)) status = usb_set_interface (xdev, interface->desc.bInterfaceNumber, interface->desc.bAlternateSetting); else status = 0; } if (status >= 0 && dev->status) status = init_status (dev, udev); if (status < 0) goto out3; if (!dev->rx_urb_size) dev->rx_urb_size = dev->hard_mtu; dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); if ((dev->driver_info->flags & FLAG_WLAN) != 0) SET_NETDEV_DEVTYPE(net, &wlan_type); if ((dev->driver_info->flags & FLAG_WWAN) != 0) SET_NETDEV_DEVTYPE(net, &wwan_type); status = register_netdev (net); if (status) goto out3; netif_info(dev, probe, dev->net, "register '%s' at usb-%s-%s, %s, %pM\n", udev->dev.driver->name, xdev->bus->bus_name, xdev->devpath, dev->driver_info->description, net->dev_addr); // ok, it's ready to go. usb_set_intfdata (udev, dev); netif_device_attach (net); if (dev->driver_info->flags & FLAG_LINK_INTR) netif_carrier_off(net); return 0; out3: if (info->unbind) info->unbind (dev, udev); out1: free_netdev(net); out: usb_put_dev(xdev); return status; } EXPORT_SYMBOL_GPL(usbnet_probe); /*-------------------------------------------------------------------------*/ /* * suspend the whole driver as soon as the first interface is suspended * resume only when the last interface is resumed */ int usbnet_suspend (struct usb_interface *intf, pm_message_t message) { struct usbnet *dev = usb_get_intfdata(intf); if (!dev->suspend_count++) { spin_lock_irq(&dev->txq.lock); /* don't autosuspend while transmitting */ if (dev->txq.qlen && PMSG_IS_AUTO(message)) { spin_unlock_irq(&dev->txq.lock); return -EBUSY; } else { set_bit(EVENT_DEV_ASLEEP, &dev->flags); spin_unlock_irq(&dev->txq.lock); } /* * accelerate emptying of the rx and queues, to avoid * having everything error out. */ netif_device_detach (dev->net); usbnet_terminate_urbs(dev); usb_kill_urb(dev->interrupt); /* * reattach so runtime management can use and * wake the device */ netif_device_attach (dev->net); } return 0; } EXPORT_SYMBOL_GPL(usbnet_suspend); int usbnet_resume (struct usb_interface *intf) { struct usbnet *dev = usb_get_intfdata(intf); struct sk_buff *skb; struct urb *res; int retval; if (!--dev->suspend_count) { /* resume interrupt URBs */ if (dev->interrupt && test_bit(EVENT_DEV_OPEN, &dev->flags)) usb_submit_urb(dev->interrupt, GFP_NOIO); spin_lock_irq(&dev->txq.lock); while ((res = usb_get_from_anchor(&dev->deferred))) { skb = (struct sk_buff *)res->context; retval = usb_submit_urb(res, GFP_ATOMIC); if (retval < 0) { dev_kfree_skb_any(skb); usb_free_urb(res); usb_autopm_put_interface_async(dev->intf); } else { dev->net->trans_start = jiffies; __skb_queue_tail(&dev->txq, skb); } } smp_mb(); clear_bit(EVENT_DEV_ASLEEP, &dev->flags); spin_unlock_irq(&dev->txq.lock); if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { if (!(dev->txq.qlen >= TX_QLEN(dev))) netif_tx_wake_all_queues(dev->net); tasklet_schedule (&dev->bh); } } return 0; } EXPORT_SYMBOL_GPL(usbnet_resume); /*-------------------------------------------------------------------------*/ static int __init usbnet_init(void) { /* Compiler should optimize this out. */ BUILD_BUG_ON( FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); random_ether_addr(node_id); return 0; } module_init(usbnet_init); static void __exit usbnet_exit(void) { } module_exit(usbnet_exit); MODULE_AUTHOR("David Brownell"); MODULE_DESCRIPTION("USB network driver framework"); MODULE_LICENSE("GPL"); |