/* * USB Networking Links * Copyright (C) 2000-2005 by David Brownell * Copyright (C) 2002 Pavel Machek * Copyright (C) 2003-2005 David Hollis * * 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: * * + USB host-to-host "network cables", used for IP-over-USB links. * These are often used for Laplink style connectivity products. * - AnchorChip 2720 * - Belkin, eTEK (interops with Win32 drivers) * - GeneSys GL620USB-A * - NetChip 1080 (interoperates with NetChip Win32 drivers) * - Prolific PL-2301/2302 (replaces "plusb" driver) * - KC Technology KC2190 * * + Smart USB devices can support such links directly, using Internet * standard protocols instead of proprietary host-to-device links. * - Linux PDAs like iPaq, Yopy, and Zaurus * - The BLOB boot loader (for diskless booting) * - Linux "gadgets", perhaps using PXA-2xx or Net2280 controllers * - Devices using EPSON's sample USB firmware * - CDC-Ethernet class devices, such as many cable modems * * + Adapters to networks such as Ethernet. * - AX8817X based USB 2.0 products * * Links to these devices can be bridged using Linux Ethernet bridging. * With minor exceptions, these all use similar USB framing for network * traffic, but need different protocols for control traffic. * * 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 SA1110, Zaurus, or EPSON device/client support in this driver; * slave/target drivers such as "usb-eth" (on most SA-1100 PDAs) or * "g_ether" (in the Linux "gadget" framework) implement that behavior * within devices. * * * 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 . * 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 ; * rx unlinks somehow weren't async; minor cleanup. * 03-nov-2001 Merged GeneSys driver; original code from Jiun-Jie Huang * , updated by Stanislav Brabec * . Made framing options (NetChip/GeneSys) * tie mostly to (sub)driver info. Workaround some PL-2302 * chips that seem to reject SET_INTERFACE requests. * * 06-apr-2002 Added ethtool support, based on a patch from Brad Hards. * Level of diagnostics is more configurable; they use device * location (usb_device->devpath) instead of address (2.5). * For tx_fixup, memflags can't be NOIO. * 07-may-2002 Generalize/cleanup keventd support, handling rx stalls (mostly * for USB 2.0 TTs) and memory shortages (potential) too. (db) * Use "locally assigned" IEEE802 address space. (Brad Hards) * 18-oct-2002 Support for Zaurus (Pavel Machek), related cleanup (db). * 14-dec-2002 Remove Zaurus-private crc32 code (Pavel); 2.5 oops fix, * cleanups and stubbed PXA-250 support (db), fix for framing * issues on Z, net1080, and gl620a (Toby Milne) * * 31-mar-2003 Use endpoint descriptors: high speed support, simpler sa1100 * vs pxa25x, and CDC Ethernet. Throttle down log floods on * disconnect; other cleanups. (db) Flush net1080 fifos * after several sequential framing errors. (Johannes Erdfelt) * 22-aug-2003 AX8817X support (Dave Hollis). * 14-jun-2004 Trivial patch for AX8817X based Buffalo LUA-U2-KTX in Japan * (Neil Bortnak) * 03-nov-2004 Trivial patch for KC2190 (KC-190) chip. (Jonathan McDowell) * * 01-feb-2005 AX88772 support (Phil Chang & Dave Hollis) *-------------------------------------------------------------------------*/ // #define DEBUG // error path messages, extra info // #define VERBOSE // more; success messages #include #ifdef CONFIG_USB_DEBUG # define DEBUG #endif #include #include #include #include #include #include #include #include #include #include "usbnet.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_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? 60 : 4) #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? 60 : 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"); /*-------------------------------------------------------------------------*/ static u32 usbnet_get_link (struct net_device *); /* mostly for PDA style devices, which are always connected if present */ static int always_connected (struct usbnet *dev) { return 0; } /* 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 altsetttings. */ 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 (!(e->desc.bEndpointAddress & USB_DIR_IN)) continue; intr = 1; /* FALLTHROUGH */ case USB_ENDPOINT_XFER_BULK: break; default: continue; } if (e->desc.bEndpointAddress & USB_DIR_IN) { 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); static void intr_complete (struct urb *urb, struct pt_regs *regs); 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, SLAB_KERNEL); if (buf) { dev->interrupt = usb_alloc_urb (0, SLAB_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; skb->dev = dev->net; skb->protocol = eth_type_trans (skb, dev->net); dev->stats.rx_packets++; dev->stats.rx_bytes += skb->len; if (netif_msg_rx_status (dev)) devdbg (dev, "< rx, len %zu, type 0x%x", skb->len + sizeof (struct ethhdr), skb->protocol); memset (skb->cb, 0, sizeof (struct skb_data)); status = netif_rx (skb); if (status != NET_RX_SUCCESS && netif_msg_rx_err (dev)) devdbg (dev, "netif_rx status %d", status); } EXPORT_SYMBOL_GPL(usbnet_skb_return); /*------------------------------------------------------------------------- * * Communications Device Class declarations. * Used by CDC Ethernet, and some CDC variants * *-------------------------------------------------------------------------*/ #ifdef CONFIG_USB_CDCETHER #define NEED_GENERIC_CDC #endif #ifdef CONFIG_USB_ZAURUS /* Ethernet variant uses funky framing, broken ethernet addressing */ #define NEED_GENERIC_CDC #endif #ifdef CONFIG_USB_RNDIS /* ACM variant uses even funkier framing, complex control RPC scheme */ #define NEED_GENERIC_CDC #endif #ifdef NEED_GENERIC_CDC #include struct cdc_state { struct usb_cdc_header_desc *header; struct usb_cdc_union_desc *u; struct usb_cdc_ether_desc *ether; struct usb_interface *control; struct usb_interface *data; }; static struct usb_driver usbnet_driver; /* * probes control interface, claims data interface, collects the bulk * endpoints, activates data interface (if needed), maybe sets MTU. * all pure cdc, except for certain firmware workarounds. */ static int generic_cdc_bind (struct usbnet *dev, struct usb_interface *intf) { u8 *buf = intf->cur_altsetting->extra; int len = intf->cur_altsetting->extralen; struct usb_interface_descriptor *d; struct cdc_state *info = (void *) &dev->data; int status; int rndis; if (sizeof dev->data < sizeof *info) return -EDOM; /* expect strict spec conformance for the descriptors, but * cope with firmware which stores them in the wrong place */ if (len == 0 && dev->udev->actconfig->extralen) { /* Motorola SB4100 (and others: Brad Hards says it's * from a Broadcom design) put CDC descriptors here */ buf = dev->udev->actconfig->extra; len = dev->udev->actconfig->extralen; if (len) dev_dbg (&intf->dev, "CDC descriptors on config\n"); } /* this assumes that if there's a non-RNDIS vendor variant * of cdc-acm, it'll fail RNDIS requests cleanly. */ rndis = (intf->cur_altsetting->desc.bInterfaceProtocol == 0xff); memset (info, 0, sizeof *info); info->control = intf; while (len > 3) { if (buf [1] != USB_DT_CS_INTERFACE) goto next_desc; /* use bDescriptorSubType to identify the CDC descriptors. * We expect devices with CDC header and union descriptors. * For CDC Ethernet we need the ethernet descriptor. * For RNDIS, ignore two (pointless) CDC modem descriptors * in favor of a complicated OID-based RPC scheme doing what * CDC Ethernet achieves with a simple descriptor. */ switch (buf [2]) { case USB_CDC_HEADER_TYPE: if (info->header) { dev_dbg (&intf->dev, "extra CDC header\n"); goto bad_desc; } info->header = (void *) buf; if (info->header->bLength != sizeof *info->header) { dev_dbg (&intf->dev, "CDC header len %u\n", info->header->bLength); goto bad_desc; } break; case USB_CDC_UNION_TYPE: if (info->u) { dev_dbg (&intf->dev, "extra CDC union\n"); goto bad_desc; } info->u = (void *) buf; if (info->u->bLength != sizeof *info->u) { dev_dbg (&intf->dev, "CDC union len %u\n", info->u->bLength); goto bad_desc; } /* we need a master/control interface (what we're * probed with) and a slave/data interface; union * descriptors sort this all out. */ info->control = usb_ifnum_to_if(dev->udev, info->u->bMasterInterface0); info->data = usb_ifnum_to_if(dev->udev, info->u->bSlaveInterface0); if (!info->control || !info->data) { dev_dbg (&intf->dev, "master #%u/%p slave #%u/%p\n", info->u->bMasterInterface0, info->control, info->u->bSlaveInterface0, info->data); goto bad_desc; } if (info->control != intf) { dev_dbg (&intf->dev, "bogus CDC Union\n"); /* Ambit USB Cable Modem (and maybe others) * interchanges master and slave interface. */ if (info->data == intf) { info->data = info->control; info->control = intf; } else goto bad_desc; } /* a data interface altsetting does the real i/o */ d = &info->data->cur_altsetting->desc; if (d->bInterfaceClass != USB_CLASS_CDC_DATA) { dev_dbg (&intf->dev, "slave class %u\n", d->bInterfaceClass); goto bad_desc; } break; case USB_CDC_ETHERNET_TYPE: if (info->ether) { dev_dbg (&intf->dev, "extra CDC ether\n"); goto bad_desc; } info->ether = (void *) buf; if (info->ether->bLength != sizeof *info->ether) { dev_dbg (&intf->dev, "CDC ether len %u\n", info->ether->bLength); goto bad_desc; } dev->hard_mtu = le16_to_cpu( info->ether->wMaxSegmentSize); /* because of Zaurus, we may be ignoring the host * side link address we were given. */ break; } next_desc: len -= buf [0]; /* bLength */ buf += buf [0]; } if (!info->header || !info->u || (!rndis && !info->ether)) { dev_dbg (&intf->dev, "missing cdc %s%s%sdescriptor\n", info->header ? "" : "header ", info->u ? "" : "union ", info->ether ? "" : "ether "); goto bad_desc; } /* claim data interface and set it up ... with side effects. * network traffic can't flow until an altsetting is enabled. */ status = usb_driver_claim_interface (&usbnet_driver, info->data, dev); if (status < 0) return status; status = usbnet_get_endpoints (dev, info->data); if (status < 0) { /* ensure immediate exit from usbnet_disconnect */ usb_set_intfdata(info->data, NULL); usb_driver_release_interface (&usbnet_driver, info->data); return status; } /* status endpoint: optional for CDC Ethernet, not RNDIS (or ACM) */ dev->status = NULL; if (info->control->cur_altsetting->desc.bNumEndpoints == 1) { struct usb_endpoint_descriptor *desc; dev->status = &info->control->cur_altsetting->endpoint [0]; desc = &dev->status->desc; if (desc->bmAttributes != USB_ENDPOINT_XFER_INT || !(desc->bEndpointAddress & USB_DIR_IN) || (le16_to_cpu(desc->wMaxPacketSize) < sizeof (struct usb_cdc_notification)) || !desc->bInterval) { dev_dbg (&intf->dev, "bad notification endpoint\n"); dev->status = NULL; } } if (rndis && !dev->status) { dev_dbg (&intf->dev, "missing RNDIS status endpoint\n"); usb_set_intfdata(info->data, NULL); usb_driver_release_interface (&usbnet_driver, info->data); return -ENODEV; } return 0; bad_desc: dev_info (&dev->udev->dev, "bad CDC descriptors\n"); return -ENODEV; } static void cdc_unbind (struct usbnet *dev, struct usb_interface *intf) { struct cdc_state *info = (void *) &dev->data; /* disconnect master --> disconnect slave */ if (intf == info->control && info->data) { /* ensure immediate exit from usbnet_disconnect */ usb_set_intfdata(info->data, NULL); usb_driver_release_interface (&usbnet_driver, info->data); info->data = NULL; } /* and vice versa (just in case) */ else if (intf == info->data && info->control) { /* ensure immediate exit from usbnet_disconnect */ usb_set_intfdata(info->control, NULL); usb_driver_release_interface (&usbnet_driver, info->control); info->control = NULL; } } #endif /* NEED_GENERIC_CDC */ #ifdef CONFIG_USB_CDCETHER #define HAVE_HARDWARE /*------------------------------------------------------------------------- * * Communications Device Class, Ethernet Control model * * Takes two interfaces. The DATA interface is inactive till an altsetting * is selected. Configuration data includes class descriptors. * * This should interop with whatever the 2.4 "CDCEther.c" driver * (by Brad Hards) talked with. * *-------------------------------------------------------------------------*/ #include static void dumpspeed (struct usbnet *dev, __le32 *speeds) { if (netif_msg_timer (dev)) devinfo (dev, "link speeds: %u kbps up, %u kbps down", __le32_to_cpu(speeds[0]) / 1000, __le32_to_cpu(speeds[1]) / 1000); } static void cdc_status (struct usbnet *dev, struct urb *urb) { struct usb_cdc_notification *event; if (urb->actual_length < sizeof *event) return; /* SPEED_CHANGE can get split into two 8-byte packets */ if (test_and_clear_bit (EVENT_STS_SPLIT, &dev->flags)) { dumpspeed (dev, (__le32 *) urb->transfer_buffer); return; } event = urb->transfer_buffer; switch (event->bNotificationType) { case USB_CDC_NOTIFY_NETWORK_CONNECTION: if (netif_msg_timer (dev)) devdbg (dev, "CDC: carrier %s", event->wValue ? "on" : "off"); if (event->wValue) netif_carrier_on(dev->net); else netif_carrier_off(dev->net); break; case USB_CDC_NOTIFY_SPEED_CHANGE: /* tx/rx rates */ if (netif_msg_timer (dev)) devdbg (dev, "CDC: speed change (len %d)", urb->actual_length); if (urb->actual_length != (sizeof *event + 8)) set_bit (EVENT_STS_SPLIT, &dev->flags); else dumpspeed (dev, (__le32 *) &event[1]); break; // case USB_CDC_NOTIFY_RESPONSE_AVAILABLE: /* RNDIS; or unsolicited */ default: deverr (dev, "CDC: unexpected notification %02x!", event->bNotificationType); break; } } static u8 nibble (unsigned char c) { if (likely (isdigit (c))) return c - '0'; c = toupper (c); if (likely (isxdigit (c))) return 10 + c - 'A'; return 0; } static inline int get_ethernet_addr (struct usbnet *dev, struct usb_cdc_ether_desc *e) { int tmp, i; unsigned char buf [13]; tmp = usb_string (dev->udev, e->iMACAddress, buf, sizeof buf); if (tmp != 12) { dev_dbg (&dev->udev->dev, "bad MAC string %d fetch, %d\n", e->iMACAddress, tmp); if (tmp >= 0) tmp = -EINVAL; return tmp; } for (i = tmp = 0; i < 6; i++, tmp += 2) dev->net->dev_addr [i] = (nibble (buf [tmp]) << 4) + nibble (buf [tmp + 1]); return 0; } static int cdc_bind (struct usbnet *dev, struct usb_interface *intf) { int status; struct cdc_state *info = (void *) &dev->data; status = generic_cdc_bind (dev, intf); if (status < 0) return status; status = get_ethernet_addr (dev, info->ether); if (status < 0) { usb_set_intfdata(info->data, NULL); usb_driver_release_interface (&usbnet_driver, info->data); return status; } /* FIXME cdc-ether has some multicast code too, though it complains * in routine cases. info->ether describes the multicast support. */ return 0; } static const struct driver_info cdc_info = { .description = "CDC Ethernet Device", .flags = FLAG_ETHER, // .check_connect = cdc_check_connect, .bind = cdc_bind, .unbind = cdc_unbind, .status = cdc_status, }; #endif /* CONFIG_USB_CDCETHER */ #ifdef CONFIG_USB_PL2301 #define HAVE_HARDWARE /*------------------------------------------------------------------------- * * Prolific PL-2301/PL-2302 driver ... http://www.prolifictech.com * * The protocol and handshaking used here should be bug-compatible * with the Linux 2.2 "plusb" driver, by Deti Fliegl. * *-------------------------------------------------------------------------*/ /* * 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, NULL, 0, USB_CTRL_GET_TIMEOUT); } 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) { /* some units seem to need this reset, others reject it utterly. * FIXME be more like "naplink" or windows drivers. */ (void) pl_set_QuickLink_features (dev, PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E); return 0; } static const struct driver_info prolific_info = { .description = "Prolific PL-2301/PL-2302", .flags = FLAG_NO_SETINT, /* some PL-2302 versions seem to fail usb_set_interface() */ .reset = pl_reset, }; #endif /* CONFIG_USB_PL2301 */ #ifdef CONFIG_USB_ZAURUS #define HAVE_HARDWARE #include /*------------------------------------------------------------------------- * * Zaurus is also a SA-1110 based PDA, but one using a different driver * (and framing) for its USB slave/gadget controller than the case above. * * For the current version of that driver, the main way that framing is * nonstandard (also from perspective of the CDC ethernet model!) is a * crc32, added to help detect when some sa1100 usb-to-memory DMA errata * haven't been fully worked around. Also, all Zaurii use the same * default Ethernet address. * * PXA based models use the same framing, and also can't implement * set_interface properly. * * All known Zaurii lie about their standards conformance. Most lie by * saying they support CDC Ethernet. Some lie and say they support CDC * MDLM (as if for access to cell phone modems). Someone, please beat * on Sharp (and other such vendors) for a while with a cluestick. * *-------------------------------------------------------------------------*/ static struct sk_buff * zaurus_tx_fixup (struct usbnet *dev, struct sk_buff *skb, unsigned flags) { int padlen; struct sk_buff *skb2; padlen = 2; if (!skb_cloned (skb)) { int tailroom = skb_tailroom (skb); if ((padlen + 4) <= tailroom) goto done; } skb2 = skb_copy_expand (skb, 0, 4 + padlen, flags); dev_kfree_skb_any (skb); skb = skb2; if (skb) { u32 fcs; done: fcs = crc32_le (~0, skb->data, skb->len); fcs = ~fcs; *skb_put (skb, 1) = fcs & 0xff; *skb_put (skb, 1) = (fcs>> 8) & 0xff; *skb_put (skb, 1) = (fcs>>16) & 0xff; *skb_put (skb, 1) = (fcs>>24) & 0xff; } return skb; } static int zaurus_bind (struct usbnet *dev, struct usb_interface *intf) { /* Belcarra's funky framing has other options; mostly * TRAILERS (!) with 4 bytes CRC, and maybe 2 pad bytes. */ dev->net->hard_header_len += 6; return generic_cdc_bind(dev, intf); } static const struct driver_info zaurus_sl5x00_info = { .description = "Sharp Zaurus SL-5x00", .flags = FLAG_FRAMING_Z, .check_connect = always_connected, .bind = zaurus_bind, .unbind = cdc_unbind, .tx_fixup = zaurus_tx_fixup, }; #define ZAURUS_STRONGARM_INFO ((unsigned long)&zaurus_sl5x00_info) static const struct driver_info zaurus_pxa_info = { .description = "Sharp Zaurus, PXA-2xx based", .flags = FLAG_FRAMING_Z, .check_connect = always_connected, .bind = zaurus_bind, .unbind = cdc_unbind, .tx_fixup = zaurus_tx_fixup, }; #define ZAURUS_PXA_INFO ((unsigned long)&zaurus_pxa_info) static const struct driver_info olympus_mxl_info = { .description = "Olympus R1000", .flags = FLAG_FRAMING_Z, .check_connect = always_connected, .bind = zaurus_bind, .unbind = cdc_unbind, .tx_fixup = zaurus_tx_fixup, }; #define OLYMPUS_MXL_INFO ((unsigned long)&olympus_mxl_info) /* Some more recent products using Lineo/Belcarra code will wrongly claim * CDC MDLM conformance. They aren't conformant: data endpoints live * in the control interface, there's no data interface, and it's not used * to talk to a cell phone radio. But at least we can detect these two * pseudo-classes, rather than growing this product list with entries for * each new nonconformant product (sigh). */ static const u8 safe_guid[16] = { 0x5d, 0x34, 0xcf, 0x66, 0x11, 0x18, 0x11, 0xd6, 0xa2, 0x1a, 0x00, 0x01, 0x02, 0xca, 0x9a, 0x7f, }; static const u8 blan_guid[16] = { 0x74, 0xf0, 0x3d, 0xbd, 0x1e, 0xc1, 0x44, 0x70, 0xa3, 0x67, 0x71, 0x34, 0xc9, 0xf5, 0x54, 0x37, }; static int blan_mdlm_bind (struct usbnet *dev, struct usb_interface *intf) { u8 *buf = intf->cur_altsetting->extra; int len = intf->cur_altsetting->extralen; struct usb_cdc_mdlm_desc *desc = NULL; struct usb_cdc_mdlm_detail_desc *detail = NULL; while (len > 3) { if (buf [1] != USB_DT_CS_INTERFACE) goto next_desc; /* use bDescriptorSubType, and just verify that we get a * "BLAN" (or "SAFE") descriptor. */ switch (buf [2]) { case USB_CDC_MDLM_TYPE: if (desc) { dev_dbg (&intf->dev, "extra MDLM\n"); goto bad_desc; } desc = (void *) buf; if (desc->bLength != sizeof *desc) { dev_dbg (&intf->dev, "MDLM len %u\n", desc->bLength); goto bad_desc; } /* expect bcdVersion 1.0, ignore */ if (memcmp(&desc->bGUID, blan_guid, 16) && memcmp(&desc->bGUID, safe_guid, 16) ) { /* hey, this one might _really_ be MDLM! */ dev_dbg (&intf->dev, "MDLM guid\n"); goto bad_desc; } break; case USB_CDC_MDLM_DETAIL_TYPE: if (detail) { dev_dbg (&intf->dev, "extra MDLM detail\n"); goto bad_desc; } detail = (void *) buf; switch (detail->bGuidDescriptorType) { case 0: /* "SAFE" */ if (detail->bLength != (sizeof *detail + 2)) goto bad_detail; break; case 1: /* "BLAN" */ if (detail->bLength != (sizeof *detail + 3)) goto bad_detail; break; default: goto bad_detail; } /* assuming we either noticed BLAN already, or will * find it soon, there are some data bytes here: * - bmNetworkCapabilities (unused) * - bmDataCapabilities (bits, see below) * - bPad (ignored, for PADAFTER -- BLAN-only) * bits are: * - 0x01 -- Zaurus framing (add CRC) * - 0x02 -- PADBEFORE (CRC includes some padding) * - 0x04 -- PADAFTER (some padding after CRC) * - 0x08 -- "fermat" packet mangling (for hw bugs) * the PADBEFORE appears not to matter; we interop * with devices that use it and those that don't. */ if ((detail->bDetailData[1] & ~02) != 0x01) { /* bmDataCapabilites == 0 would be fine too, * but framing is minidriver-coupled for now. */ bad_detail: dev_dbg (&intf->dev, "bad MDLM detail, %d %d %d\n", detail->bLength, detail->bDetailData[0], detail->bDetailData[2]); goto bad_desc; } break; } next_desc: len -= buf [0]; /* bLength */ buf += buf [0]; } if (!desc || !detail) { dev_dbg (&intf->dev, "missing cdc mdlm %s%sdescriptor\n", desc ? "" : "func ", detail ? "" : "detail "); goto bad_desc; } /* There's probably a CDC Ethernet descriptor there, but we can't * rely on the Ethernet address it provides since not all vendors * bother to make it unique. Likewise there's no point in tracking * of the CDC event notifications. */ return usbnet_get_endpoints (dev, intf); bad_desc: dev_info (&dev->udev->dev, "unsupported MDLM descriptors\n"); return -ENODEV; } static const struct driver_info bogus_mdlm_info = { .description = "pseudo-MDLM (BLAN) device", .flags = FLAG_FRAMING_Z, .check_connect = always_connected, .tx_fixup = zaurus_tx_fixup, .bind = blan_mdlm_bind, }; #else /* blacklist all those devices */ #define ZAURUS_STRONGARM_INFO 0 #define ZAURUS_PXA_INFO 0 #define OLYMPUS_MXL_INFO 0 #endif /*------------------------------------------------------------------------- * * 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 = netdev_priv(net); int ll_mtu = new_mtu + net->hard_header_len; if (new_mtu <= 0 || ll_mtu > dev->hard_mtu) 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; return 0; } /*-------------------------------------------------------------------------*/ static struct net_device_stats *usbnet_get_stats (struct net_device *net) { struct usbnet *dev = netdev_priv(net); return &dev->stats; } /*-------------------------------------------------------------------------*/ /* 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)) deverr (dev, "kevent %d may have been dropped", work); else devdbg (dev, "kevent %d scheduled", work); } EXPORT_SYMBOL_GPL(usbnet_defer_kevent); /*-------------------------------------------------------------------------*/ static void rx_complete (struct urb *urb, struct pt_regs *regs); static void rx_submit (struct usbnet *dev, struct urb *urb, unsigned flags) { struct sk_buff *skb; struct skb_data *entry; int retval = 0; unsigned long lockflags; size_t size = dev->rx_urb_size; if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) { if (netif_msg_rx_err (dev)) devdbg (dev, "no rx skb"); usbnet_defer_kevent (dev, EVENT_RX_MEMORY); usb_free_urb (urb); return; } skb_reserve (skb, NET_IP_ALIGN); 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)) { 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: if (netif_msg_ifdown (dev)) devdbg (dev, "device gone"); netif_device_detach (dev->net); break; default: if (netif_msg_rx_err (dev)) devdbg (dev, "rx submit, %d", retval); tasklet_schedule (&dev->bh); break; case 0: __skb_queue_tail (&dev->rxq, skb); } } else { if (netif_msg_ifdown (dev)) devdbg (dev, "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->rx_fixup && !dev->driver_info->rx_fixup (dev, skb)) goto error; // else network stack removes extra byte if we forced a short packet if (skb->len) usbnet_skb_return (dev, skb); else { if (netif_msg_rx_err (dev)) devdbg (dev, "drop"); error: dev->stats.rx_errors++; skb_queue_tail (&dev->done, skb); } } /*-------------------------------------------------------------------------*/ static void rx_complete (struct urb *urb, struct pt_regs *regs) { 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->stats.rx_errors++; dev->stats.rx_length_errors++; if (netif_msg_rx_err (dev)) devdbg (dev, "rx length %d", 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 ETIMEOUT/EILSEQ // storm, recovering as needed. case -EPIPE: dev->stats.rx_errors++; usbnet_defer_kevent (dev, EVENT_RX_HALT); // FALLTHROUGH // software-driven interface shutdown case -ECONNRESET: // async unlink case -ESHUTDOWN: // hardware gone if (netif_msg_ifdown (dev)) devdbg (dev, "rx shutdown, code %d", 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: // ehci case -ETIMEDOUT: // ohci case -EILSEQ: // uhci dev->stats.rx_errors++; if (!timer_pending (&dev->delay)) { mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); if (netif_msg_link (dev)) devdbg (dev, "rx throttle %d", urb_status); } block: entry->state = rx_cleanup; entry->urb = urb; urb = NULL; break; // data overrun ... flush fifo? case -EOVERFLOW: dev->stats.rx_over_errors++; // FALLTHROUGH default: entry->state = rx_cleanup; dev->stats.rx_errors++; if (netif_msg_rx_err (dev)) devdbg (dev, "rx status %d", 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); return; } usb_free_urb (urb); } if (netif_msg_rx_err (dev)) devdbg (dev, "no read resubmitted"); } static void intr_complete (struct urb *urb, struct pt_regs *regs) { 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 if (netif_msg_ifdown (dev)) devdbg (dev, "intr shutdown, code %d", status); return; /* NOTE: not throttling like RX/TX, since this endpoint * already polls infrequently */ default: devdbg (dev, "intr status %d", 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_msg_timer (dev)) deverr(dev, "intr resubmit --> %d", status); } /*-------------------------------------------------------------------------*/ // 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); 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 != -EINPROGRESS && retval != 0) devdbg (dev, "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 = netdev_priv(net); int temp; DECLARE_WAIT_QUEUE_HEAD (unlink_wakeup); DECLARE_WAITQUEUE (wait, current); netif_stop_queue (net); if (netif_msg_ifdown (dev)) devinfo (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, &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)) { msleep(UNLINK_TIMEOUT_MS); if (netif_msg_ifdown (dev)) devdbg (dev, "waited for %d urb completions", temp); } dev->wait = NULL; remove_wait_queue (&unlink_wakeup, &wait); usb_kill_urb(dev->interrupt); /* 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); return 0; } /*-------------------------------------------------------------------------*/ // posts reads, and enables write queuing // precondition: never called in_interrupt static int usbnet_open (struct net_device *net) { struct usbnet *dev = netdev_priv(net); int retval = 0; struct driver_info *info = dev->driver_info; // put into "known safe" state if (info->reset && (retval = info->reset (dev)) < 0) { if (netif_msg_ifup (dev)) devinfo (dev, "open reset fail (%d) usbnet usb-%s-%s, %s", 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) { if (netif_msg_ifup (dev)) devdbg (dev, "can't open; %d", retval); goto done; } /* start any status interrupt transfer */ if (dev->interrupt) { retval = usb_submit_urb (dev->interrupt, GFP_KERNEL); if (retval < 0) { if (netif_msg_ifup (dev)) deverr (dev, "intr submit %d", retval); goto done; } } netif_start_queue (net); if (netif_msg_ifup (dev)) { char *framing; if (dev->driver_info->flags & FLAG_FRAMING_NC) framing = "NetChip"; else if (dev->driver_info->flags & FLAG_FRAMING_GL) framing = "GeneSys"; else if (dev->driver_info->flags & FLAG_FRAMING_Z) framing = "Zaurus"; else if (dev->driver_info->flags & FLAG_FRAMING_RN) framing = "RNDIS"; else if (dev->driver_info->flags & FLAG_FRAMING_AX) framing = "ASIX"; else framing = "simple"; devinfo (dev, "open: enable queueing " "(rx %d, tx %d) mtu %d %s framing", RX_QLEN (dev), TX_QLEN (dev), dev->net->mtu, framing); } // delay posting reads until we're fully open tasklet_schedule (&dev->bh); done: return retval; } /*-------------------------------------------------------------------------*/ /* ethtool methods; minidrivers may need to add some more, but * they'll probably want to use this base set. */ void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) { struct usbnet *dev = netdev_priv(net); /* REVISIT don't always return "usbnet" */ strncpy (info->driver, 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); static 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; /* Otherwise, say we're up (to avoid breaking scripts) */ return 1; } 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 struct ethtool_ops usbnet_ethtool_ops = { .get_drvinfo = usbnet_get_drvinfo, .get_link = usbnet_get_link, .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 (void *data) { struct usbnet *dev = data; int status; /* usb_clear_halt() needs a thread context */ if (test_bit (EVENT_TX_HALT, &dev->flags)) { unlink_urbs (dev, &dev->txq); status = usb_clear_halt (dev->udev, dev->out); if (status < 0 && status != -EPIPE && status != -ESHUTDOWN) { if (netif_msg_tx_err (dev)) deverr (dev, "can't clear tx halt, status %d", 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_clear_halt (dev->udev, dev->in); if (status < 0 && status != -EPIPE && status != -ESHUTDOWN) { if (netif_msg_rx_err (dev)) deverr (dev, "can't clear rx halt, status %d", 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; 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); rx_submit (dev, urb, GFP_KERNEL); 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); if(info->link_reset && (retval = info->link_reset(dev)) < 0) { devinfo(dev, "link reset failed (%d) usbnet usb-%s-%s, %s", retval, dev->udev->bus->bus_name, dev->udev->devpath, info->description); } } if (dev->flags) devdbg (dev, "kevent done, flags = 0x%lx", dev->flags); } /*-------------------------------------------------------------------------*/ static void tx_complete (struct urb *urb, struct pt_regs *regs) { 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) { dev->stats.tx_packets++; dev->stats.tx_bytes += entry->length; } else { dev->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: // ehci case -ETIMEDOUT: // ohci case -EILSEQ: // uhci if (!timer_pending (&dev->delay)) { mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); if (netif_msg_link (dev)) devdbg (dev, "tx throttle %d", urb->status); } netif_stop_queue (dev->net); break; default: if (netif_msg_tx_err (dev)) devdbg (dev, "tx err %d", entry->urb->status); break; } } urb->dev = NULL; entry->state = tx_done; defer_bh(dev, skb, &dev->txq); } /*-------------------------------------------------------------------------*/ static 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? } /*-------------------------------------------------------------------------*/ static int usbnet_start_xmit (struct sk_buff *skb, struct net_device *net) { struct usbnet *dev = netdev_priv(net); int length; int retval = NET_XMIT_SUCCESS; struct urb *urb = NULL; struct skb_data *entry; struct driver_info *info = dev->driver_info; unsigned long flags; // 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)) devdbg (dev, "can't tx_fixup skb"); goto drop; } } length = skb->len; if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { if (netif_msg_tx_err (dev)) devdbg (dev, "no urb"); 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. * * FIXME zero that byte, if it doesn't require a new skb. */ if ((length % dev->maxpacket) == 0) urb->transfer_buffer_length++; spin_lock_irqsave (&dev->txq.lock, flags); switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { case -EPIPE: netif_stop_queue (net); usbnet_defer_kevent (dev, EVENT_TX_HALT); break; default: if (netif_msg_tx_err (dev)) devdbg (dev, "tx: submit urb err %d", 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) { if (netif_msg_tx_err (dev)) devdbg (dev, "drop, code %d", retval); drop: retval = NET_XMIT_SUCCESS; dev->stats.tx_dropped++; if (skb) dev_kfree_skb_any (skb); usb_free_urb (urb); } else if (netif_msg_tx_queued (dev)) { devdbg (dev, "> tx, len %d, type 0x%x", length, skb->protocol); } return retval; } /*-------------------------------------------------------------------------*/ // 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: devdbg (dev, "bogus skb state %d", 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) rx_submit (dev, urb, GFP_ATOMIC); } if (temp != dev->rxq.qlen && netif_msg_link (dev)) devdbg (dev, "rxqlen %d --> %d", 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); if (netif_msg_probe (dev)) devinfo (dev, "unregister '%s' usb-%s-%s, %s", intf->dev.driver->name, xdev->bus->bus_name, xdev->devpath, dev->driver_info->description); net = dev->net; unregister_netdev (net); /* we don't hold rtnl here ... */ flush_scheduled_work (); if (dev->driver_info->unbind) dev->driver_info->unbind (dev, intf); free_netdev(net); usb_put_dev (xdev); } EXPORT_SYMBOL_GPL(usbnet_disconnect); /*-------------------------------------------------------------------------*/ // precondition: never called in_interrupt 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; info = (struct driver_info *) prod->driver_info; if (!info) { dev_dbg (&udev->dev, "blacklisted by %s\n", driver_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) { dbg ("can't kmalloc dev"); goto out; } dev = netdev_priv(net); dev->udev = xdev; dev->driver_info = info; 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); dev->bh.func = usbnet_bh; dev->bh.data = (unsigned long) dev; INIT_WORK (&dev->kevent, kevent, dev); dev->delay.function = usbnet_bh; dev->delay.data = (unsigned long) dev; init_timer (&dev->delay); SET_MODULE_OWNER (net); 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_64BIT_MASK)) net->features |= NETIF_F_HIGHDMA; #endif 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; 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); // 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 && (net->dev_addr [0] & 0x02) == 0) strcpy (net->name, "eth%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 out1; if (!dev->rx_urb_size) dev->rx_urb_size = dev->hard_mtu; dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); SET_NETDEV_DEV(net, &udev->dev); status = register_netdev (net); if (status) goto out3; if (netif_msg_probe (dev)) devinfo (dev, "register '%s' at usb-%s-%s, %s, " "%02x:%02x:%02x:%02x:%02x:%02x", udev->dev.driver->name, xdev->bus->bus_name, xdev->devpath, dev->driver_info->description, net->dev_addr [0], net->dev_addr [1], net->dev_addr [2], net->dev_addr [3], net->dev_addr [4], net->dev_addr [5]); // ok, it's ready to go. usb_set_intfdata (udev, dev); // start as if the link is up netif_device_attach (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); /*-------------------------------------------------------------------------*/ /* FIXME these suspend/resume methods assume non-CDC style * devices, with only one interface. */ int usbnet_suspend (struct usb_interface *intf, pm_message_t message) { struct usbnet *dev = usb_get_intfdata(intf); /* accelerate emptying of the rx and queues, to avoid * having everything error out. */ netif_device_detach (dev->net); (void) unlink_urbs (dev, &dev->rxq); (void) unlink_urbs (dev, &dev->txq); intf->dev.power.power_state = PMSG_SUSPEND; return 0; } EXPORT_SYMBOL_GPL(usbnet_suspend); int usbnet_resume (struct usb_interface *intf) { struct usbnet *dev = usb_get_intfdata(intf); intf->dev.power.power_state = PMSG_ON; netif_device_attach (dev->net); tasklet_schedule (&dev->bh); return 0; } EXPORT_SYMBOL_GPL(usbnet_resume); /*-------------------------------------------------------------------------*/ #ifndef HAVE_HARDWARE #error You need to configure some hardware for this driver #endif /* * 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_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 #ifdef CONFIG_USB_RNDIS { /* RNDIS is MSFT's un-official variant of CDC ACM */ USB_INTERFACE_INFO (USB_CLASS_COMM, 2 /* ACM */, 0x0ff), .driver_info = (unsigned long) &rndis_info, }, #endif #if defined(CONFIG_USB_ZAURUS) || defined(CONFIG_USB_CDCETHER) /* * SA-1100 based Sharp Zaurus ("collie"), or compatible. * Same idea as above, but different framing. * * PXA-2xx based models are also lying-about-cdc. * Some models don't even tell the same lies ... * * NOTE: OpenZaurus versions with 2.6 kernels won't use these entries, * unlike the older ones with 2.4 "embedix" kernels. * * NOTE: These entries do double-duty, serving as blacklist entries * whenever Zaurus support isn't enabled, but CDC Ethernet is. */ #define ZAURUS_MASTER_INTERFACE \ .bInterfaceClass = USB_CLASS_COMM, \ .bInterfaceSubClass = USB_CDC_SUBCLASS_ETHERNET, \ .bInterfaceProtocol = USB_CDC_PROTO_NONE { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO | USB_DEVICE_ID_MATCH_DEVICE, .idVendor = 0x04DD, .idProduct = 0x8004, ZAURUS_MASTER_INTERFACE, .driver_info = ZAURUS_STRONGARM_INFO, }, { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO | USB_DEVICE_ID_MATCH_DEVICE, .idVendor = 0x04DD, .idProduct = 0x8005, /* A-300 */ ZAURUS_MASTER_INTERFACE, .driver_info = ZAURUS_PXA_INFO, }, { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO | USB_DEVICE_ID_MATCH_DEVICE, .idVendor = 0x04DD, .idProduct = 0x8006, /* B-500/SL-5600 */ ZAURUS_MASTER_INTERFACE, .driver_info = ZAURUS_PXA_INFO, }, { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO | USB_DEVICE_ID_MATCH_DEVICE, .idVendor = 0x04DD, .idProduct = 0x8007, /* C-700 */ ZAURUS_MASTER_INTERFACE, .driver_info = ZAURUS_PXA_INFO, }, { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO | USB_DEVICE_ID_MATCH_DEVICE, .idVendor = 0x04DD, .idProduct = 0x9031, /* C-750 C-760 */ ZAURUS_MASTER_INTERFACE, .driver_info = ZAURUS_PXA_INFO, }, { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO | USB_DEVICE_ID_MATCH_DEVICE, .idVendor = 0x04DD, .idProduct = 0x9032, /* SL-6000 */ ZAURUS_MASTER_INTERFACE, .driver_info = ZAURUS_PXA_INFO, }, { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO | USB_DEVICE_ID_MATCH_DEVICE, .idVendor = 0x04DD, /* reported with some C860 units */ .idProduct = 0x9050, /* C-860 */ ZAURUS_MASTER_INTERFACE, .driver_info = ZAURUS_PXA_INFO, }, #ifdef CONFIG_USB_ZAURUS /* At least some (reports vary) PXA units have very different lies * about their standards support: they claim to be cell phones with * direct access to their radios. (They don't conform to CDC MDLM.) */ { USB_INTERFACE_INFO (USB_CLASS_COMM, USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE), .driver_info = (unsigned long) &bogus_mdlm_info, }, #endif /* Olympus has some models with a Zaurus-compatible option. * R-1000 uses a FreeScale i.MXL cpu (ARMv4T) */ { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO | USB_DEVICE_ID_MATCH_DEVICE, .idVendor = 0x07B4, .idProduct = 0x0F02, /* R-1000 */ ZAURUS_MASTER_INTERFACE, .driver_info = OLYMPUS_MXL_INFO, }, #endif #ifdef CONFIG_USB_CDCETHER { /* CDC Ether uses two interfaces, not necessarily consecutive. * We match the main interface, ignoring the optional device * class so we could handle devices that aren't exclusively * CDC ether. * * NOTE: this match must come AFTER entries working around * bugs/quirks in a given product (like Zaurus, above). */ USB_INTERFACE_INFO (USB_CLASS_COMM, USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE), .driver_info = (unsigned long) &cdc_info, }, #endif { }, // END }; MODULE_DEVICE_TABLE (usb, products); static struct usb_driver usbnet_driver = { .owner = THIS_MODULE, .name = driver_name, .id_table = products, .probe = usbnet_probe, .disconnect = usbnet_disconnect, .suspend = usbnet_suspend, .resume = usbnet_resume, }; /*-------------------------------------------------------------------------*/ static int __init usbnet_init(void) { // compiler should optimize these out BUG_ON (sizeof (((struct sk_buff *)0)->cb) < sizeof (struct skb_data)); #ifdef CONFIG_USB_CDCETHER BUG_ON ((sizeof (((struct usbnet *)0)->data) < sizeof (struct cdc_state))); #endif random_ether_addr(node_id); return usb_register(&usbnet_driver); } module_init(usbnet_init); static void __exit usbnet_exit(void) { usb_deregister(&usbnet_driver); } module_exit(usbnet_exit); MODULE_AUTHOR("David Brownell"); MODULE_DESCRIPTION("USB Host-to-Host Link Drivers (numerous vendors)"); MODULE_LICENSE("GPL");