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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 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 | /* * USB Host-to-Host Links * Copyright (C) 2000-2001 by David Brownell <dbrownell@users.sourceforge.net> */ /* * This is used for "USB networking", connecting USB hosts as peers. * * It can be used with USB "network cables", for IP-over-USB communications; * Ethernet speeds without the Ethernet. USB devices (including some PDAs) * can support such links directly, replacing device-specific protocols * with Internet standard ones. * * The links can be bridged using the Ethernet bridging (net/bridge) * support as appropriate. Devices currently supported include: * * - AnchorChip 2720 * - Belkin, eTEK (interops with Win32 drivers) * - "Linux Devices" (like iPaq and similar SA-1100 based PDAs) * - NetChip 1080 (interoperates with NetChip Win32 drivers) * - Prolific PL-2301/2302 (replaces "plusb" driver) * * USB devices can implement their side of this protocol at the cost * of two bulk endpoints; it's not restricted to "cable" applications. * See the LINUXDEV support. * * * TODO: * * This needs to be retested for bulk queuing problems ... earlier versions * seemed to find different types of problems in each HCD. Once they're fixed, * re-enable queues to get higher bandwidth utilization (without needing * to tweak MTU for larger packets). * * Add support for more "network cable" chips; interop with their Win32 * drivers may be a good thing. Test the AnchorChip 2720 support.. * Figure out the initialization protocol used by the Prolific chips, * for better robustness ... there's some powerup/reset handshake that's * needed when only one end reboots. * * Use interrupt on PL230x to detect peer connect/disconnect, and call * netif_carrier_{on,off} (?) appropriately. For Net1080, detect peer * connect/disconnect with async control messages. * * Find some way to report "peer connected" network hotplug events; it'll * likely mean updating the networking layer. (This has been discussed * on the netdev list...) * * Craft smarter hotplug policy scripts ... ones that know how to arrange * bridging with "brctl", and can handle static and dynamic ("pump") setups. * Use those "peer connected" events. * * * CHANGELOG: * * 13-sep-2000 experimental, new * 10-oct-2000 usb_device_id table created. * 28-oct-2000 misc fixes; mostly, discard more TTL-mangled rx packets. * 01-nov-2000 usb_device_id table and probing api update by * Adam J. Richter <adam@yggdrasil.com>. * 18-dec-2000 (db) tx watchdog, "net1080" renaming to "usbnet", device_info * and prolific support, isolate net1080-specific bits, cleanup. * fix unlink_urbs oops in D3 PM resume code path. * 02-feb-2001 (db) fix tx skb sharing, packet length, match_flags, ... * 08-feb-2001 stubbed in "linuxdev", maybe the SA-1100 folk can use it; * AnchorChips 2720 support (from spec) for testing; * fix bit-ordering problem with ethernet multicast addr * 19-feb-2001 Support for clearing halt conditions. SA1100 UDC support * updates. Oleg Drokin (green@iXcelerator.com) * 25-mar-2001 More SA-1100 updates, including workaround for ip problem * expecting cleared skb->cb and framing change to match latest * handhelds.org version (Oleg). Enable device IDs from the * Win32 Belkin driver; other cleanups (db). * 16-jul-2001 Bugfixes for uhci oops-on-unplug, Belkin support, various * cleanups for problems not yet seen in the field. (db) * 17-oct-2001 Handle "Advance USBNET" product, like Belkin/eTEK devices, * from Ioannis Mavroukakis <i.mavroukakis@btinternet.com>; * rx unlinks somehow weren't async; minor cleanup. * *-------------------------------------------------------------------------*/ #include <linux/config.h> #include <linux/module.h> #include <linux/kmod.h> #include <linux/sched.h> #include <linux/init.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/random.h> #include <asm/unaligned.h> // #define DEBUG // error path messages, extra info // #define VERBOSE // more; success messages // #define REALLY_QUEUE #if !defined (DEBUG) && defined (CONFIG_USB_DEBUG) # define DEBUG #endif #include <linux/usb.h> #define CONFIG_USB_AN2720 #define CONFIG_USB_BELKIN #define CONFIG_USB_LINUXDEV #define CONFIG_USB_NET1080 #define CONFIG_USB_PL2301 /*-------------------------------------------------------------------------*/ /* * 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. */ #ifdef REALLY_QUEUE #define RX_QLEN 4 #define TX_QLEN 4 #else #define RX_QLEN 1 #define TX_QLEN 1 #endif // packets are always ethernet inside // ... except they can be bigger (limit of 64K with NetChip framing) #define MIN_PACKET sizeof(struct ethhdr) #define MAX_PACKET 32768 // reawaken network queue this soon after stopping; else watchdog barks #define TX_TIMEOUT_JIFFIES (5*HZ) // for vendor-specific control operations #define CONTROL_TIMEOUT_MS (500) /* msec */ #define CONTROL_TIMEOUT_JIFFIES ((CONTROL_TIMEOUT_MS * HZ)/1000) // between wakeups #define UNLINK_TIMEOUT_JIFFIES ((3 /*ms*/ * HZ)/1000) /*-------------------------------------------------------------------------*/ // list of all devices we manage static DECLARE_MUTEX (usbnet_mutex); static LIST_HEAD (usbnet_list); // randomly generated ethernet address static u8 node_id [ETH_ALEN]; // state we keep for each device we handle struct usbnet { // housekeeping struct usb_device *udev; struct driver_info *driver_info; struct semaphore mutex; struct list_head dev_list; wait_queue_head_t *wait; // protocol/interface state struct net_device net; struct net_device_stats stats; u16 packet_id; // various kinds of pending driver work struct sk_buff_head rxq; struct sk_buff_head txq; struct sk_buff_head done; struct tasklet_struct bh; struct tq_struct ctrl_task; }; // device-specific info used by the driver struct driver_info { char *description; int flags; #define FLAG_FRAMING_NC 0x0001 /* guard against device dropouts */ #define FLAG_NO_SETINT 0x0010 /* device can't set_interface() */ /* reset device ... can sleep */ int (*reset)(struct usbnet *); /* see if peer is connected ... can sleep */ int (*check_connect)(struct usbnet *); // FIXME -- also an interrupt mechanism /* framework currently "knows" bulk EPs talk packets */ int in; /* rx endpoint */ int out; /* tx endpoint */ int epsize; }; #define EP_SIZE(usbnet) ((usbnet)->driver_info->epsize) // we record the state for each of our queued skbs enum skb_state { illegal = 0, tx_start, tx_done, rx_start, rx_done, rx_cleanup }; struct skb_data { // skb->cb is one of these struct urb *urb; struct usbnet *dev; enum skb_state state; size_t length; }; #define mutex_lock(x) down(x) #define mutex_unlock(x) up(x) #define RUN_CONTEXT (in_irq () ? "in_irq" \ : (in_interrupt () ? "in_interrupt" : "can sleep")) /*-------------------------------------------------------------------------*/ #ifdef DEBUG #define devdbg(usbnet, fmt, arg...) \ printk(KERN_DEBUG "%s: " fmt "\n" , (usbnet)->net.name, ## arg) #else #define devdbg(usbnet, fmt, arg...) do {} while(0) #endif #define devinfo(usbnet, fmt, arg...) \ printk(KERN_INFO "%s: " fmt "\n" , (usbnet)->net.name, ## arg) /*------------------------------------------------------------------------- * * NetChip framing of ethernet packets, supporting additional error * checks for links that may drop bulk packets from inside messages. * Odd USB length == always short read for last usb packet. * - nc_header * - Ethernet header (14 bytes) * - payload * - (optional padding byte, if needed so length becomes odd) * - nc_trailer * * This framing is to be avoided for non-NetChip devices. */ struct nc_header { // packed: u16 hdr_len; // sizeof nc_header (LE, all) u16 packet_len; // payload size (including ethhdr) u16 packet_id; // detects dropped packets #define MIN_HEADER 6 // all else is optional, and must start with: // u16 vendorId; // from usb-if // u16 productId; } __attribute__((__packed__)); #define PAD_BYTE ((unsigned char)0xAC) struct nc_trailer { u16 packet_id; } __attribute__((__packed__)); // packets may use FLAG_FRAMING_NC and optional pad #define FRAMED_SIZE(mtu) (sizeof (struct nc_header) \ + sizeof (struct ethhdr) \ + (mtu) \ + 1 \ + sizeof (struct nc_trailer)) #define MIN_FRAMED FRAMED_SIZE(0) #ifdef CONFIG_USB_AN2720 /*------------------------------------------------------------------------- * * AnchorChips 2720 driver ... http://www.cypress.com * * This doesn't seem to have a way to detect whether the peer is * connected, or need any reset handshaking. It's got pretty big * internal buffers (handles most of a frame's worth of data). * Chip data sheets don't describe any vendor control messages. * *-------------------------------------------------------------------------*/ static const struct driver_info an2720_info = { description: "AnchorChips/Cypress 2720", // no reset available! // no check_connect available! in: 2, out: 2, // direction distinguishes these epsize: 64, }; #endif /* CONFIG_USB_AN2720 */ #ifdef CONFIG_USB_BELKIN /*------------------------------------------------------------------------- * * Belkin F5U104 ... two NetChip 2280 devices + Atmel microcontroller * * ... also two eTEK designs, including one sold as "Advance USBNET" * *-------------------------------------------------------------------------*/ static const struct driver_info belkin_info = { description: "Belkin, eTEK, or compatible", in: 1, out: 1, // direction distinguishes these epsize: 64, }; #endif /* CONFIG_USB_BELKIN */ #ifdef CONFIG_USB_LINUXDEV /*------------------------------------------------------------------------- * * This could talk to a device that uses Linux, such as a PDA or * an embedded system, or in fact to any "smart" device using this * particular mapping of USB and Ethernet. * * Such a Linux host would need a "USB Device Controller" hardware * (not "USB Host Controller"), and a network driver talking to that * hardware. * * One example is Intel's SA-1100 chip, which integrates basic USB * support (arch/arm/sa1100/usb-eth.c); it's used in the iPaq PDA. * *-------------------------------------------------------------------------*/ static const struct driver_info linuxdev_info = { description: "Linux Device", // no reset defined (yet?) // no check_connect needed! in: 2, out: 1, epsize: 64, }; #endif /* CONFIG_USB_LINUXDEV */ #ifdef CONFIG_USB_NET1080 /*------------------------------------------------------------------------- * * Netchip 1080 driver ... http://www.netchip.com * *-------------------------------------------------------------------------*/ /* * Zero means no timeout; else, how long a 64 byte bulk packet may be queued * before the hardware drops it. If that's done, the driver will need to * frame network packets to guard against the dropped USB packets. The win32 * driver sets this for both sides of the link. */ #define NC_READ_TTL_MS ((u8)255) // ms /* * We ignore most registers and EEPROM contents. */ #define REG_USBCTL ((u8)0x04) #define REG_TTL ((u8)0x10) #define REG_STATUS ((u8)0x11) /* * Vendor specific requests to read/write data */ #define REQUEST_REGISTER ((u8)0x10) #define REQUEST_EEPROM ((u8)0x11) static int nc_vendor_read (struct usbnet *dev, u8 req, u8 regnum, u16 *retval_ptr) { int status = usb_control_msg (dev->udev, usb_rcvctrlpipe (dev->udev, 0), req, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, 0, regnum, retval_ptr, sizeof *retval_ptr, CONTROL_TIMEOUT_JIFFIES); if (status > 0) status = 0; if (!status) le16_to_cpus (retval_ptr); return status; } static inline int nc_register_read (struct usbnet *dev, u8 regnum, u16 *retval_ptr) { return nc_vendor_read (dev, REQUEST_REGISTER, regnum, retval_ptr); } // no retval ... can become async, usable in_interrupt() static void nc_vendor_write (struct usbnet *dev, u8 req, u8 regnum, u16 value) { usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0), req, USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, value, regnum, 0, 0, // data is in setup packet CONTROL_TIMEOUT_JIFFIES); } static inline void nc_register_write (struct usbnet *dev, u8 regnum, u16 value) { nc_vendor_write (dev, REQUEST_REGISTER, regnum, value); } #if 0 static void nc_dump_registers (struct usbnet *dev) { u8 reg; u16 *vp = kmalloc (sizeof (u16)); if (!vp) { dbg ("no memory?"); return; } dbg ("%s registers:", dev->net.name); for (reg = 0; reg < 0x20; reg++) { int retval; // reading some registers is trouble if (reg >= 0x08 && reg <= 0xf) continue; if (reg >= 0x12 && reg <= 0x1e) continue; retval = nc_register_read (dev, reg, vp); if (retval < 0) dbg ("%s reg [0x%x] ==> error %d", dev->net.name, reg, retval); else dbg ("%s reg [0x%x] = 0x%x", dev->net.name, reg, *vp); } kfree (vp); } #endif /*-------------------------------------------------------------------------*/ /* * Control register */ #define USBCTL_WRITABLE_MASK 0x1f0f // bits 15-13 reserved, r/o #define USBCTL_ENABLE_LANG (1 << 12) #define USBCTL_ENABLE_MFGR (1 << 11) #define USBCTL_ENABLE_PROD (1 << 10) #define USBCTL_ENABLE_SERIAL (1 << 9) #define USBCTL_ENABLE_DEFAULTS (1 << 8) // bits 7-4 reserved, r/o #define USBCTL_FLUSH_OTHER (1 << 3) #define USBCTL_FLUSH_THIS (1 << 2) #define USBCTL_DISCONN_OTHER (1 << 1) #define USBCTL_DISCONN_THIS (1 << 0) static inline void nc_dump_usbctl (struct usbnet *dev, u16 usbctl) { #ifdef DEBUG devdbg (dev, "net1080 %03d/%03d usbctl 0x%x:%s%s%s%s%s;" " this%s%s;" " other%s%s; r/o 0x%x", dev->udev->bus->busnum, dev->udev->devnum, usbctl, (usbctl & USBCTL_ENABLE_LANG) ? " lang" : "", (usbctl & USBCTL_ENABLE_MFGR) ? " mfgr" : "", (usbctl & USBCTL_ENABLE_PROD) ? " prod" : "", (usbctl & USBCTL_ENABLE_SERIAL) ? " serial" : "", (usbctl & USBCTL_ENABLE_DEFAULTS) ? " defaults" : "", (usbctl & USBCTL_FLUSH_OTHER) ? " FLUSH" : "", (usbctl & USBCTL_DISCONN_OTHER) ? " DIS" : "", (usbctl & USBCTL_FLUSH_THIS) ? " FLUSH" : "", (usbctl & USBCTL_DISCONN_THIS) ? " DIS" : "", usbctl & ~USBCTL_WRITABLE_MASK ); #endif } /*-------------------------------------------------------------------------*/ /* * Status register */ #define STATUS_PORT_A (1 << 15) #define STATUS_CONN_OTHER (1 << 14) #define STATUS_SUSPEND_OTHER (1 << 13) #define STATUS_MAILBOX_OTHER (1 << 12) #define STATUS_PACKETS_OTHER(n) (((n) >> 8) && 0x03) #define STATUS_CONN_THIS (1 << 6) #define STATUS_SUSPEND_THIS (1 << 5) #define STATUS_MAILBOX_THIS (1 << 4) #define STATUS_PACKETS_THIS(n) (((n) >> 0) && 0x03) #define STATUS_UNSPEC_MASK 0x0c8c #define STATUS_NOISE_MASK ((u16)~(0x0303|STATUS_UNSPEC_MASK)) static inline void nc_dump_status (struct usbnet *dev, u16 status) { #ifdef DEBUG devdbg (dev, "net1080 %03d/%03d status 0x%x:" " this (%c) PKT=%d%s%s%s;" " other PKT=%d%s%s%s; unspec 0x%x", dev->udev->bus->busnum, dev->udev->devnum, status, // XXX the packet counts don't seem right // (1 at reset, not 0); maybe UNSPEC too (status & STATUS_PORT_A) ? 'A' : 'B', STATUS_PACKETS_THIS (status), (status & STATUS_CONN_THIS) ? " CON" : "", (status & STATUS_SUSPEND_THIS) ? " SUS" : "", (status & STATUS_MAILBOX_THIS) ? " MBOX" : "", STATUS_PACKETS_OTHER (status), (status & STATUS_CONN_OTHER) ? " CON" : "", (status & STATUS_SUSPEND_OTHER) ? " SUS" : "", (status & STATUS_MAILBOX_OTHER) ? " MBOX" : "", status & STATUS_UNSPEC_MASK ); #endif } /*-------------------------------------------------------------------------*/ /* * TTL register */ #define TTL_THIS(ttl) (0x00ff & ttl) #define TTL_OTHER(ttl) (0x00ff & (ttl >> 8)) #define MK_TTL(this,other) ((u16)(((other)<<8)|(0x00ff&(this)))) static inline void nc_dump_ttl (struct usbnet *dev, u16 ttl) { #ifdef DEBUG devdbg (dev, "net1080 %03d/%03d ttl 0x%x this = %d, other = %d", dev->udev->bus->busnum, dev->udev->devnum, ttl, TTL_THIS (ttl), TTL_OTHER (ttl) ); #endif } /*-------------------------------------------------------------------------*/ static int net1080_reset (struct usbnet *dev) { u16 usbctl, status, ttl; u16 *vp = kmalloc (sizeof (u16), GFP_KERNEL); int retval; if (!vp) return -ENOMEM; // nc_dump_registers (dev); if ((retval = nc_register_read (dev, REG_STATUS, vp)) < 0) { dbg ("can't read dev %d status: %d", dev->udev->devnum, retval); goto done; } status = *vp; // nc_dump_status (dev, status); if ((retval = nc_register_read (dev, REG_USBCTL, vp)) < 0) { dbg ("can't read USBCTL, %d", retval); goto done; } usbctl = *vp; // nc_dump_usbctl (dev, usbctl); nc_register_write (dev, REG_USBCTL, USBCTL_FLUSH_THIS | USBCTL_FLUSH_OTHER); if ((retval = nc_register_read (dev, REG_TTL, vp)) < 0) { dbg ("can't read TTL, %d", retval); goto done; } ttl = *vp; // nc_dump_ttl (dev, ttl); nc_register_write (dev, REG_TTL, MK_TTL (NC_READ_TTL_MS, TTL_OTHER (ttl)) ); dbg ("%s: assigned TTL, %d ms", dev->net.name, NC_READ_TTL_MS); devdbg (dev, "port %c, peer %sconnected", (status & STATUS_PORT_A) ? 'A' : 'B', (status & STATUS_CONN_OTHER) ? "" : "dis" ); retval = 0; done: kfree (vp); return retval; } static int net1080_check_connect (struct usbnet *dev) { int retval; u16 status; u16 *vp = kmalloc (sizeof (u16), GFP_KERNEL); if (!vp) return -ENOMEM; retval = nc_register_read (dev, REG_STATUS, vp); status = *vp; kfree (vp); if (retval != 0) { dbg ("%s net1080_check_conn read - %d", dev->net.name, retval); return retval; } if ((status & STATUS_CONN_OTHER) != STATUS_CONN_OTHER) return -ENOLINK; return 0; } static const struct driver_info net1080_info = { description: "NetChip TurboCONNECT", flags: FLAG_FRAMING_NC, reset: net1080_reset, check_connect: net1080_check_connect, in: 1, out: 1, // direction distinguishes these epsize: 64, }; #endif /* CONFIG_USB_NET1080 */ #ifdef CONFIG_USB_PL2301 /*------------------------------------------------------------------------- * * Prolific PL-2301/PL-2302 driver ... http://www.prolifictech.com * *-------------------------------------------------------------------------*/ /* * Bits 0-4 can be used for software handshaking; they're set from * one end, cleared from the other, "read" with the interrupt byte. */ #define PL_S_EN (1<<7) /* (feature only) suspend enable */ /* reserved bit -- rx ready (6) ? */ #define PL_TX_READY (1<<5) /* (interrupt only) transmit ready */ #define PL_RESET_OUT (1<<4) /* reset output pipe */ #define PL_RESET_IN (1<<3) /* reset input pipe */ #define PL_TX_C (1<<2) /* transmission complete */ #define PL_TX_REQ (1<<1) /* transmission received */ #define PL_PEER_E (1<<0) /* peer exists */ static inline int pl_vendor_req (struct usbnet *dev, u8 req, u8 val, u8 index) { return usb_control_msg (dev->udev, usb_rcvctrlpipe (dev->udev, 0), req, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, val, index, 0, 0, CONTROL_TIMEOUT_JIFFIES); } static inline int pl_clear_QuickLink_features (struct usbnet *dev, int val) { return pl_vendor_req (dev, 1, (u8) val, 0); } static inline int pl_set_QuickLink_features (struct usbnet *dev, int val) { return pl_vendor_req (dev, 3, (u8) val, 0); } /*-------------------------------------------------------------------------*/ static int pl_reset (struct usbnet *dev) { return pl_set_QuickLink_features (dev, PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E); } static int pl_check_connect (struct usbnet *dev) { // FIXME test interrupt data PL_PEER_E bit // plus, there's some handshake done by // the prolific win32 driver... dbg ("%s: assuming peer is connected", dev->net.name); return 0; } static const struct driver_info prolific_info = { description: "Prolific PL-2301/PL-2302", reset: pl_reset, check_connect: pl_check_connect, in: 3, out: 2, epsize: 64, }; #endif /* CONFIG_USB_PL2301 */ /*------------------------------------------------------------------------- * * Network Device Driver (peer link to "Host Device", from USB host) * *-------------------------------------------------------------------------*/ static int usbnet_change_mtu (struct net_device *net, int new_mtu) { struct usbnet *dev = (struct usbnet *) net->priv; if (new_mtu <= MIN_PACKET || new_mtu > MAX_PACKET) return -EINVAL; if (((dev->driver_info->flags) & FLAG_FRAMING_NC)) { if (FRAMED_SIZE (new_mtu) > MAX_PACKET) return -EINVAL; // no second zero-length packet read wanted after mtu-sized packets } else if (((new_mtu + sizeof (struct ethhdr)) % EP_SIZE (dev)) == 0) return -EDOM; net->mtu = new_mtu; return 0; } /*-------------------------------------------------------------------------*/ static struct net_device_stats *usbnet_get_stats (struct net_device *net) { return &((struct usbnet *) net->priv)->stats; } /*-------------------------------------------------------------------------*/ /* urb completions are currently in_irq; avoid doing real work then. */ static void defer_bh (struct usbnet *dev, struct sk_buff *skb) { struct sk_buff_head *list = skb->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); } /*-------------------------------------------------------------------------*/ static void rx_complete (struct urb *urb); static void rx_submit (struct usbnet *dev, struct urb *urb, int flags) { struct sk_buff *skb; struct skb_data *entry; int retval = 0; unsigned long lockflags; size_t size; if (dev->driver_info->flags & FLAG_FRAMING_NC) size = FRAMED_SIZE (dev->net.mtu); else size = (sizeof (struct ethhdr) + dev->net.mtu); if ((skb = alloc_skb (size, flags)) == 0) { dbg ("no rx skb"); tasklet_schedule (&dev->bh); usb_free_urb (urb); return; } entry = (struct skb_data *) skb->cb; entry->urb = urb; entry->dev = dev; entry->state = rx_start; entry->length = 0; FILL_BULK_URB (urb, dev->udev, usb_rcvbulkpipe (dev->udev, dev->driver_info->in), skb->data, size, rx_complete, skb); urb->transfer_flags |= USB_ASYNC_UNLINK; #ifdef REALLY_QUEUE urb->transfer_flags |= USB_QUEUE_BULK; #endif #if 0 // Idle-but-posted reads with UHCI really chew up // PCI bandwidth unless FSBR is disabled urb->transfer_flags |= USB_NO_FSBR; #endif spin_lock_irqsave (&dev->rxq.lock, lockflags); if (netif_running (&dev->net)) { if ((retval = usb_submit_urb (urb)) != 0) { dbg ("%s rx submit, %d", dev->net.name, retval); tasklet_schedule (&dev->bh); } else { __skb_queue_tail (&dev->rxq, skb); } } else { dbg ("rx: stopped"); retval = -ENOLINK; } spin_unlock_irqrestore (&dev->rxq.lock, lockflags); if (retval) { dev_kfree_skb_any (skb); usb_free_urb (urb); } } /*-------------------------------------------------------------------------*/ static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) { if (dev->driver_info->flags & FLAG_FRAMING_NC) { struct nc_header *header; struct nc_trailer *trailer; if (!(skb->len & 0x01) || MIN_FRAMED > skb->len || skb->len > FRAMED_SIZE (dev->net.mtu)) { dev->stats.rx_frame_errors++; dbg ("rx framesize %d range %d..%d mtu %d", skb->len, MIN_FRAMED, FRAMED_SIZE (dev->net.mtu), dev->net.mtu ); goto error; } header = (struct nc_header *) skb->data; le16_to_cpus (&header->hdr_len); le16_to_cpus (&header->packet_len); if (FRAMED_SIZE (header->packet_len) > MAX_PACKET) { dev->stats.rx_frame_errors++; dbg ("packet too big, %d", header->packet_len); goto error; } else if (header->hdr_len < MIN_HEADER) { dev->stats.rx_frame_errors++; dbg ("header too short, %d", header->hdr_len); goto error; } else if (header->hdr_len > MIN_HEADER) { // out of band data for us? dbg ("header OOB, %d bytes", header->hdr_len - MIN_HEADER); // switch (vendor/product ids) { ... } } skb_pull (skb, header->hdr_len); trailer = (struct nc_trailer *) (skb->data + skb->len - sizeof *trailer); skb_trim (skb, skb->len - sizeof *trailer); if ((header->packet_len & 0x01) == 0) { if (skb->data [header->packet_len] != PAD_BYTE) { dev->stats.rx_frame_errors++; dbg ("bad pad"); goto error; } skb_trim (skb, skb->len - 1); } if (skb->len != header->packet_len) { dev->stats.rx_frame_errors++; dbg ("bad packet len %d (expected %d)", skb->len, header->packet_len); goto error; } if (header->packet_id != get_unaligned (&trailer->packet_id)) { dev->stats.rx_fifo_errors++; dbg ("(2+ dropped) rx packet_id mismatch 0x%x 0x%x", header->packet_id, trailer->packet_id); goto error; } #if 0 devdbg (dev, "frame <rx h %d p %d id %d", header->hdr_len, header->packet_len, header->packet_id); #endif } else { // we trust the network stack to remove // the extra byte we may have appended } if (skb->len) { int status; // FIXME: eth_copy_and_csum "small" packets to new SKB (small < ~200 bytes) ? skb->dev = &dev->net; skb->protocol = eth_type_trans (skb, &dev->net); dev->stats.rx_packets++; dev->stats.rx_bytes += skb->len; #ifdef VERBOSE devdbg (dev, "< rx, len %d, type 0x%x", skb->len + sizeof (struct ethhdr), skb->protocol); #endif memset (skb->cb,0,sizeof(struct skb_data)); status = netif_rx (skb); if (status != NET_RX_SUCCESS) devdbg (dev, "netif_rx status %d", status); } else { dbg ("drop"); error: dev->stats.rx_errors++; 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 = 0; switch (urb_status) { // success case 0: if (MIN_PACKET > skb->len || skb->len > MAX_PACKET) { entry->state = rx_cleanup; dev->stats.rx_errors++; dev->stats.rx_length_errors++; dbg ("rx length %d", skb->len); } break; // software-driven interface shutdown case -ECONNRESET: // usb-ohci, usb-uhci case -ECONNABORTED: // uhci ... for usb-uhci, INTR dbg ("%s shutdown, code %d", dev->net.name, urb_status); entry->state = rx_cleanup; // do urb frees only in the tasklet entry->urb = urb; urb = 0; break; // data overrun ... flush fifo? case -EOVERFLOW: dev->stats.rx_over_errors++; // FALLTHROUGH default: // on unplug we'll get a burst of ETIMEDOUT/EILSEQ // till the khubd gets and handles its interrupt. entry->state = rx_cleanup; dev->stats.rx_errors++; dbg ("%s rx: status %d", dev->net.name, urb_status); break; } defer_bh (dev, skb); if (urb) { if (netif_running (&dev->net)) { rx_submit (dev, urb, GFP_ATOMIC); return; } } #ifdef VERBOSE dbg ("no read resubmitted"); #endif /* VERBOSE */ } /*-------------------------------------------------------------------------*/ // unlink pending rx/tx; completion handlers do all other cleanup static int unlink_urbs (struct sk_buff_head *q) { unsigned long flags; struct sk_buff *skb, *skbnext; int count = 0; spin_lock_irqsave (&q->lock, flags); for (skb = q->next; skb != (struct sk_buff *) q; skb = skbnext) { struct skb_data *entry; struct urb *urb; int retval; entry = (struct skb_data *) skb->cb; urb = entry->urb; skbnext = skb->next; // during some PM-driven resume scenarios, // these (async) unlinks complete immediately retval = usb_unlink_urb (urb); if (retval < 0) dbg ("unlink urb err, %d", retval); else count++; } spin_unlock_irqrestore (&q->lock, flags); return count; } /*-------------------------------------------------------------------------*/ // precondition: never called in_interrupt static int usbnet_stop (struct net_device *net) { struct usbnet *dev = (struct usbnet *) net->priv; int temp; DECLARE_WAIT_QUEUE_HEAD (unlink_wakeup); DECLARE_WAITQUEUE (wait, current); mutex_lock (&dev->mutex); netif_stop_queue(net); devdbg (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld", dev->stats.rx_packets, dev->stats.tx_packets, dev->stats.rx_errors, dev->stats.tx_errors ); // ensure there are no more active urbs add_wait_queue (&unlink_wakeup, &wait); dev->wait = &unlink_wakeup; temp = unlink_urbs (&dev->txq) + unlink_urbs (&dev->rxq); // maybe wait for deletions to finish. while (skb_queue_len (&dev->rxq) && skb_queue_len (&dev->txq) && skb_queue_len (&dev->done)) { set_current_state(TASK_UNINTERRUPTIBLE); schedule_timeout (UNLINK_TIMEOUT_JIFFIES); dbg ("waited for %d urb completions", temp); } dev->wait = 0; remove_wait_queue (&unlink_wakeup, &wait); mutex_unlock (&dev->mutex); return 0; } /*-------------------------------------------------------------------------*/ // posts reads, and enables write queing // precondition: never called in_interrupt static int usbnet_open (struct net_device *net) { struct usbnet *dev = (struct usbnet *) net->priv; int retval = 0; struct driver_info *info = dev->driver_info; mutex_lock (&dev->mutex); // put into "known safe" state if (info->reset && (retval = info->reset (dev)) < 0) { devinfo (dev, "open reset fail (%d) usbnet %03d/%03d, %s", retval, dev->udev->bus->busnum, dev->udev->devnum, info->description); goto done; } // insist peer be connected if (info->check_connect && (retval = info->check_connect (dev)) < 0) { devdbg (dev, "can't open; %d", retval); goto done; } netif_start_queue (net); devdbg (dev, "open: enable queueing (rx %d, tx %d) mtu %d %s framing", RX_QLEN, TX_QLEN, dev->net.mtu, (info->flags & FLAG_FRAMING_NC) ? "NetChip" : "raw" ); // delay posting reads until we're fully open tasklet_schedule (&dev->bh); done: mutex_unlock (&dev->mutex); return retval; } /*-------------------------------------------------------------------------*/ /* usb_clear_halt cannot be called in interrupt context */ static void tx_clear_halt(void *data) { struct usbnet *dev = data; usb_clear_halt (dev->udev, usb_sndbulkpipe (dev->udev, dev->driver_info->out)); netif_wake_queue (&dev->net); } /*-------------------------------------------------------------------------*/ 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 == USB_ST_STALL) { if (dev->ctrl_task.sync == 0) { dev->ctrl_task.routine = tx_clear_halt; dev->ctrl_task.data = dev; schedule_task(&dev->ctrl_task); } else { dbg ("Cannot clear TX stall"); } } urb->dev = 0; entry->state = tx_done; defer_bh (dev, skb); } /*-------------------------------------------------------------------------*/ static void usbnet_tx_timeout (struct net_device *net) { struct usbnet *dev = (struct usbnet *) net->priv; unlink_urbs (&dev->txq); tasklet_schedule (&dev->bh); // FIXME: device recovery -- reset? } /*-------------------------------------------------------------------------*/ static inline struct sk_buff *fixup_skb (struct sk_buff *skb, int flags) { int padlen; struct sk_buff *skb2; padlen = ((skb->len + sizeof (struct nc_header) + sizeof (struct nc_trailer)) & 0x01) ? 0 : 1; if (!skb_cloned (skb)) { int headroom = skb_headroom (skb); int tailroom = skb_tailroom (skb); if ((padlen + sizeof (struct nc_trailer)) <= tailroom && sizeof (struct nc_header) <= headroom) return skb; if ((sizeof (struct nc_header) + padlen + sizeof (struct nc_trailer)) < (headroom + tailroom)) { skb->data = memmove (skb->head + sizeof (struct nc_header), skb->data, skb->len); skb->tail = skb->data + skb->len; return skb; } } skb2 = skb_copy_expand (skb, sizeof (struct nc_header), sizeof (struct nc_trailer) + padlen, flags); dev_kfree_skb_any (skb); return skb2; } /*-------------------------------------------------------------------------*/ static int usbnet_start_xmit (struct sk_buff *skb, struct net_device *net) { struct usbnet *dev = (struct usbnet *) net->priv; int length = skb->len; int retval = NET_XMIT_SUCCESS; struct urb *urb = 0; struct skb_data *entry; struct nc_header *header = 0; struct nc_trailer *trailer = 0; struct driver_info *info = dev->driver_info; int flags; flags = in_interrupt () ? GFP_ATOMIC : GFP_KERNEL; if (info->flags & FLAG_FRAMING_NC) { struct sk_buff *skb2; skb2 = fixup_skb (skb, flags); if (!skb2) { dbg ("can't fixup skb"); goto drop; } skb = skb2; } if (!(urb = usb_alloc_urb (0))) { dbg ("no urb"); goto drop; } entry = (struct skb_data *) skb->cb; entry->urb = urb; entry->dev = dev; entry->state = tx_start; entry->length = length; if (info->flags & FLAG_FRAMING_NC) { header = (struct nc_header *) skb_push (skb, sizeof *header); header->hdr_len = cpu_to_le16 (sizeof (*header)); header->packet_len = cpu_to_le16 (length); if (!((skb->len + sizeof *trailer) & 0x01)) *skb_put (skb, 1) = PAD_BYTE; trailer = (struct nc_trailer *) skb_put (skb, sizeof *trailer); } else if ((length % EP_SIZE (dev)) == 0) { // not all hardware behaves with USB_ZERO_PACKET, // so we add an extra one-byte packet if (skb_shared (skb)) { struct sk_buff *skb2; skb2 = skb_unshare (skb, flags); if (!skb2) { dbg ("can't unshare skb"); goto drop; } skb = skb2; } skb->len++; } FILL_BULK_URB (urb, dev->udev, usb_sndbulkpipe (dev->udev, info->out), skb->data, skb->len, tx_complete, skb); urb->transfer_flags |= USB_ASYNC_UNLINK; #ifdef REALLY_QUEUE urb->transfer_flags |= USB_QUEUE_BULK; #endif // FIXME urb->timeout = ... jiffies ... ; spin_lock_irqsave (&dev->txq.lock, flags); if (info->flags & FLAG_FRAMING_NC) { header->packet_id = cpu_to_le16 (dev->packet_id++); put_unaligned (header->packet_id, &trailer->packet_id); #if 0 devdbg (dev, "frame >tx h %d p %d id %d", header->hdr_len, header->packet_len, header->packet_id); #endif } netif_stop_queue (net); if ((retval = usb_submit_urb (urb)) != 0) { netif_start_queue (net); dbg ("%s tx: submit urb err %d", net->name, retval); } else { net->trans_start = jiffies; __skb_queue_tail (&dev->txq, skb); if (dev->txq.qlen < TX_QLEN) netif_start_queue (net); } spin_unlock_irqrestore (&dev->txq.lock, flags); if (retval) { devdbg (dev, "drop, code %d", retval); drop: retval = NET_XMIT_DROP; dev->stats.tx_dropped++; dev_kfree_skb_any (skb); usb_free_urb (urb); #ifdef VERBOSE } else { devdbg (dev, "> tx, len %d, type 0x%x", length, skb->protocol); #endif } return retval; } /*-------------------------------------------------------------------------*/ // tasklet ... work that avoided running in_irq() 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: if (entry->urb->status) { // can this statistic become more specific? dev->stats.tx_errors++; dbg ("%s tx: err %d", dev->net.name, entry->urb->status); } else { dev->stats.tx_packets++; dev->stats.tx_bytes += entry->length; } // FALLTHROUGH: case rx_cleanup: usb_free_urb (entry->urb); dev_kfree_skb (skb); continue; default: dbg ("%s: bogus skb state %d", dev->net.name, 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)) { int temp = dev->rxq.qlen; if (temp < RX_QLEN) { struct urb *urb; int i; for (i = 0; i < 3 && dev->rxq.qlen < RX_QLEN; i++) { if ((urb = usb_alloc_urb (0)) != 0) rx_submit (dev, urb, GFP_ATOMIC); } if (temp != dev->rxq.qlen) devdbg (dev, "rxqlen %d --> %d", temp, dev->rxq.qlen); if (dev->rxq.qlen < RX_QLEN) tasklet_schedule (&dev->bh); } if (dev->txq.qlen < TX_QLEN) netif_wake_queue (&dev->net); } } /*------------------------------------------------------------------------- * * USB Device Driver support * *-------------------------------------------------------------------------*/ // precondition: never called in_interrupt static void usbnet_disconnect (struct usb_device *udev, void *ptr) { struct usbnet *dev = (struct usbnet *) ptr; devinfo (dev, "unregister usbnet %03d/%03d, %s", udev->bus->busnum, udev->devnum, dev->driver_info->description); unregister_netdev (&dev->net); mutex_lock (&usbnet_mutex); mutex_lock (&dev->mutex); list_del (&dev->dev_list); mutex_unlock (&usbnet_mutex); kfree (dev); usb_dec_dev_use (udev); } /*-------------------------------------------------------------------------*/ // precondition: never called in_interrupt static void * usbnet_probe (struct usb_device *udev, unsigned ifnum, const struct usb_device_id *prod) { struct usbnet *dev; struct net_device *net; struct usb_interface_descriptor *interface; struct driver_info *info; int altnum = 0; info = (struct driver_info *) prod->driver_info; // sanity check; expect dedicated interface/devices for now. interface = &udev->actconfig->interface [ifnum].altsetting [altnum]; if (udev->descriptor.bNumConfigurations != 1 || udev->config[0].bNumInterfaces != 1 // || interface->bInterfaceClass != USB_CLASS_VENDOR_SPEC ) { dbg ("Bogus config info"); return 0; } // more sanity (unless the device is broken) if (!(info->flags & FLAG_NO_SETINT)) { if (usb_set_interface (udev, ifnum, altnum) < 0) { err ("set_interface failed"); return 0; } } // set up our own records if (!(dev = kmalloc (sizeof *dev, GFP_KERNEL))) { dbg ("can't kmalloc dev"); return 0; } memset (dev, 0, sizeof *dev); init_MUTEX_LOCKED (&dev->mutex); usb_inc_dev_use (udev); dev->udev = udev; dev->driver_info = info; INIT_LIST_HEAD (&dev->dev_list); skb_queue_head_init (&dev->rxq); skb_queue_head_init (&dev->txq); skb_queue_head_init (&dev->done); dev->bh.func = usbnet_bh; dev->bh.data = (unsigned long) dev; // set up network interface records net = &dev->net; SET_MODULE_OWNER (net); net->priv = dev; strcpy (net->name, "usb%d"); memcpy (net->dev_addr, node_id, sizeof node_id); // point-to-point link ... we always use Ethernet headers // supports win32 interop and the bridge driver. ether_setup (net); net->change_mtu = usbnet_change_mtu; net->get_stats = usbnet_get_stats; net->hard_start_xmit = usbnet_start_xmit; net->open = usbnet_open; net->stop = usbnet_stop; net->watchdog_timeo = TX_TIMEOUT_JIFFIES; net->tx_timeout = usbnet_tx_timeout; register_netdev (&dev->net); devinfo (dev, "register usbnet %03d/%03d, %s", udev->bus->busnum, udev->devnum, dev->driver_info->description); // ok, it's ready to go. mutex_lock (&usbnet_mutex); list_add (&dev->dev_list, &usbnet_list); mutex_unlock (&dev->mutex); // start as if the link is up netif_device_attach (&dev->net); mutex_unlock (&usbnet_mutex); return dev; } /*-------------------------------------------------------------------------*/ /* * chip vendor names won't normally be on the cables, and * may not be on the device. */ static const struct usb_device_id products [] = { #ifdef CONFIG_USB_AN2720 { USB_DEVICE (0x0547, 0x2720), // AnchorChips defaults driver_info: (unsigned long) &an2720_info, }, #endif #ifdef CONFIG_USB_BELKIN { USB_DEVICE (0x050d, 0x0004), // Belkin driver_info: (unsigned long) &belkin_info, }, { USB_DEVICE (0x056c, 0x8100), // eTEK driver_info: (unsigned long) &belkin_info, }, { USB_DEVICE (0x0525, 0x9901), // Advance USBNET (eTEK) driver_info: (unsigned long) &belkin_info, }, #endif // GeneSys GL620USB (www.genesyslogic.com.tw) // (patch exists against an older driver version) #ifdef CONFIG_USB_LINUXDEV /* * for example, this can be a host side talk-to-PDA driver. * this driver is NOT what runs _inside_ a Linux device !! */ { // 1183 = 0x049F, both used as hex values? USB_DEVICE (0x049F, 0x505A), // Compaq "Itsy" driver_info: (unsigned long) &linuxdev_info, }, #endif #ifdef CONFIG_USB_NET1080 { USB_DEVICE (0x0525, 0x1080), // NetChip ref design driver_info: (unsigned long) &net1080_info, }, #endif #ifdef CONFIG_USB_PL2301 { USB_DEVICE (0x067b, 0x0000), // PL-2301 driver_info: (unsigned long) &prolific_info, }, { USB_DEVICE (0x067b, 0x0001), // PL-2302 driver_info: (unsigned long) &prolific_info, }, #endif { }, // END }; MODULE_DEVICE_TABLE (usb, products); static struct usb_driver usbnet_driver = { name: "usbnet", id_table: products, probe: usbnet_probe, disconnect: usbnet_disconnect, }; /*-------------------------------------------------------------------------*/ static int __init usbnet_init (void) { // compiler should optimize this out if (sizeof (((struct sk_buff *)0)->cb) < sizeof (struct skb_data)) BUG (); get_random_bytes (node_id, sizeof node_id); node_id [0] &= 0xfe; // clear multicast bit if (usb_register (&usbnet_driver) < 0) return -1; return 0; } module_init (usbnet_init); static void __exit usbnet_exit (void) { usb_deregister (&usbnet_driver); } module_exit (usbnet_exit); EXPORT_NO_SYMBOLS; MODULE_AUTHOR ("David Brownell <dbrownell@users.sourceforge.net>"); MODULE_DESCRIPTION ("USB Host-to-Host Link Drivers (numerous vendors)"); MODULE_LICENSE ("GPL"); |