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![Alan Stern](/assets/img/avatar_default.png)
The syzbot fuzzer identified a problem in the usbnet driver: usb 1-1: BOGUS urb xfer, pipe 3 != type 1 WARNING: CPU: 0 PID: 754 at drivers/usb/core/urb.c:504 usb_submit_urb+0xed6/0x1880 drivers/usb/core/urb.c:504 Modules linked in: CPU: 0 PID: 754 Comm: kworker/0:2 Not tainted 6.4.0-rc7-syzkaller-00014-g692b7dc87ca6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Workqueue: mld mld_ifc_work RIP: 0010:usb_submit_urb+0xed6/0x1880 drivers/usb/core/urb.c:504 Code: 7c 24 18 e8 2c b4 5b fb 48 8b 7c 24 18 e8 42 07 f0 fe 41 89 d8 44 89 e1 4c 89 ea 48 89 c6 48 c7 c7 a0 c9 fc 8a e8 5a 6f 23 fb <0f> 0b e9 58 f8 ff ff e8 fe b3 5b fb 48 81 c5 c0 05 00 00 e9 84 f7 RSP: 0018:ffffc9000463f568 EFLAGS: 00010086 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff88801eb28000 RSI: ffffffff814c03b7 RDI: 0000000000000001 RBP: ffff8881443b7190 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000003 R13: ffff88802a77cb18 R14: 0000000000000003 R15: ffff888018262500 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000556a99c15a18 CR3: 0000000028c71000 CR4: 0000000000350ef0 Call Trace: <TASK> usbnet_start_xmit+0xfe5/0x2190 drivers/net/usb/usbnet.c:1453 __netdev_start_xmit include/linux/netdevice.h:4918 [inline] netdev_start_xmit include/linux/netdevice.h:4932 [inline] xmit_one net/core/dev.c:3578 [inline] dev_hard_start_xmit+0x187/0x700 net/core/dev.c:3594 ... This bug is caused by the fact that usbnet trusts the bulk endpoint addresses its probe routine receives in the driver_info structure, and it does not check to see that these endpoints actually exist and have the expected type and directions. The fix is simply to add such a check. Reported-and-tested-by: syzbot+63ee658b9a100ffadbe2@syzkaller.appspotmail.com Closes: https://lore.kernel.org/linux-usb/000000000000a56e9105d0cec021@google.com/ Signed-off-by: Alan Stern <stern@rowland.harvard.edu> CC: Oliver Neukum <oneukum@suse.com> Link: https://lore.kernel.org/r/ea152b6d-44df-4f8a-95c6-4db51143dcc1@rowland.harvard.edu Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2232 lines
58 KiB
C
2232 lines
58 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* USB Network driver infrastructure
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* Copyright (C) 2000-2005 by David Brownell
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* Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
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*/
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/*
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* This is a generic "USB networking" framework that works with several
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* kinds of full and high speed networking devices: host-to-host cables,
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* smart usb peripherals, and actual Ethernet adapters.
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*
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* These devices usually differ in terms of control protocols (if they
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* even have one!) and sometimes they define new framing to wrap or batch
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* Ethernet packets. Otherwise, they talk to USB pretty much the same,
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* so interface (un)binding, endpoint I/O queues, fault handling, and other
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* issues can usefully be addressed by this framework.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ctype.h>
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#include <linux/ethtool.h>
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#include <linux/workqueue.h>
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#include <linux/mii.h>
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#include <linux/usb.h>
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#include <linux/usb/usbnet.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/pm_runtime.h>
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/*-------------------------------------------------------------------------*/
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/*
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* Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
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* Several dozen bytes of IPv4 data can fit in two such transactions.
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* One maximum size Ethernet packet takes twenty four of them.
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* For high speed, each frame comfortably fits almost 36 max size
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* Ethernet packets (so queues should be bigger).
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*
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* The goal is to let the USB host controller be busy for 5msec or
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* more before an irq is required, under load. Jumbograms change
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* the equation.
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*/
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#define MAX_QUEUE_MEMORY (60 * 1518)
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#define RX_QLEN(dev) ((dev)->rx_qlen)
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#define TX_QLEN(dev) ((dev)->tx_qlen)
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// reawaken network queue this soon after stopping; else watchdog barks
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#define TX_TIMEOUT_JIFFIES (5*HZ)
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/* throttle rx/tx briefly after some faults, so hub_wq might disconnect()
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* us (it polls at HZ/4 usually) before we report too many false errors.
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*/
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#define THROTTLE_JIFFIES (HZ/8)
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// between wakeups
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#define UNLINK_TIMEOUT_MS 3
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/*-------------------------------------------------------------------------*/
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// randomly generated ethernet address
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static u8 node_id [ETH_ALEN];
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/* use ethtool to change the level for any given device */
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static int msg_level = -1;
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module_param (msg_level, int, 0);
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MODULE_PARM_DESC (msg_level, "Override default message level");
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/*-------------------------------------------------------------------------*/
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static const char * const usbnet_event_names[] = {
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[EVENT_TX_HALT] = "EVENT_TX_HALT",
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[EVENT_RX_HALT] = "EVENT_RX_HALT",
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[EVENT_RX_MEMORY] = "EVENT_RX_MEMORY",
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[EVENT_STS_SPLIT] = "EVENT_STS_SPLIT",
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[EVENT_LINK_RESET] = "EVENT_LINK_RESET",
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[EVENT_RX_PAUSED] = "EVENT_RX_PAUSED",
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[EVENT_DEV_ASLEEP] = "EVENT_DEV_ASLEEP",
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[EVENT_DEV_OPEN] = "EVENT_DEV_OPEN",
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[EVENT_DEVICE_REPORT_IDLE] = "EVENT_DEVICE_REPORT_IDLE",
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[EVENT_NO_RUNTIME_PM] = "EVENT_NO_RUNTIME_PM",
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[EVENT_RX_KILL] = "EVENT_RX_KILL",
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[EVENT_LINK_CHANGE] = "EVENT_LINK_CHANGE",
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[EVENT_SET_RX_MODE] = "EVENT_SET_RX_MODE",
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[EVENT_NO_IP_ALIGN] = "EVENT_NO_IP_ALIGN",
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};
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/* handles CDC Ethernet and many other network "bulk data" interfaces */
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int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
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{
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int tmp;
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struct usb_host_interface *alt = NULL;
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struct usb_host_endpoint *in = NULL, *out = NULL;
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struct usb_host_endpoint *status = NULL;
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for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
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unsigned ep;
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in = out = status = NULL;
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alt = intf->altsetting + tmp;
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/* take the first altsetting with in-bulk + out-bulk;
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* remember any status endpoint, just in case;
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* ignore other endpoints and altsettings.
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*/
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for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
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struct usb_host_endpoint *e;
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int intr = 0;
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e = alt->endpoint + ep;
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/* ignore endpoints which cannot transfer data */
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if (!usb_endpoint_maxp(&e->desc))
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continue;
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switch (e->desc.bmAttributes) {
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case USB_ENDPOINT_XFER_INT:
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if (!usb_endpoint_dir_in(&e->desc))
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continue;
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intr = 1;
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fallthrough;
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case USB_ENDPOINT_XFER_BULK:
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break;
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default:
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continue;
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}
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if (usb_endpoint_dir_in(&e->desc)) {
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if (!intr && !in)
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in = e;
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else if (intr && !status)
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status = e;
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} else {
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if (!out)
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out = e;
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}
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}
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if (in && out)
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break;
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}
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if (!alt || !in || !out)
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return -EINVAL;
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if (alt->desc.bAlternateSetting != 0 ||
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!(dev->driver_info->flags & FLAG_NO_SETINT)) {
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tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
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alt->desc.bAlternateSetting);
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if (tmp < 0)
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return tmp;
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}
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dev->in = usb_rcvbulkpipe (dev->udev,
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in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
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dev->out = usb_sndbulkpipe (dev->udev,
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out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
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dev->status = status;
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return 0;
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}
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EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
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int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
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{
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u8 addr[ETH_ALEN];
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int tmp = -1, ret;
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unsigned char buf [13];
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ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
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if (ret == 12)
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tmp = hex2bin(addr, buf, 6);
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if (tmp < 0) {
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dev_dbg(&dev->udev->dev,
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"bad MAC string %d fetch, %d\n", iMACAddress, tmp);
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if (ret >= 0)
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ret = -EINVAL;
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return ret;
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}
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eth_hw_addr_set(dev->net, addr);
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return 0;
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}
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EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
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static void intr_complete (struct urb *urb)
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{
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struct usbnet *dev = urb->context;
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int status = urb->status;
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switch (status) {
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/* success */
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case 0:
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dev->driver_info->status(dev, urb);
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break;
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/* software-driven interface shutdown */
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case -ENOENT: /* urb killed */
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case -ESHUTDOWN: /* hardware gone */
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netif_dbg(dev, ifdown, dev->net,
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"intr shutdown, code %d\n", status);
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return;
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/* NOTE: not throttling like RX/TX, since this endpoint
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* already polls infrequently
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*/
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default:
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netdev_dbg(dev->net, "intr status %d\n", status);
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break;
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}
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status = usb_submit_urb (urb, GFP_ATOMIC);
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if (status != 0)
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netif_err(dev, timer, dev->net,
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"intr resubmit --> %d\n", status);
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}
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static int init_status (struct usbnet *dev, struct usb_interface *intf)
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{
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char *buf = NULL;
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unsigned pipe = 0;
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unsigned maxp;
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unsigned period;
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if (!dev->driver_info->status)
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return 0;
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pipe = usb_rcvintpipe (dev->udev,
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dev->status->desc.bEndpointAddress
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& USB_ENDPOINT_NUMBER_MASK);
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maxp = usb_maxpacket(dev->udev, pipe);
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/* avoid 1 msec chatter: min 8 msec poll rate */
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period = max ((int) dev->status->desc.bInterval,
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(dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
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buf = kmalloc (maxp, GFP_KERNEL);
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if (buf) {
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dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
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if (!dev->interrupt) {
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kfree (buf);
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return -ENOMEM;
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} else {
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usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
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buf, maxp, intr_complete, dev, period);
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dev->interrupt->transfer_flags |= URB_FREE_BUFFER;
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dev_dbg(&intf->dev,
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"status ep%din, %d bytes period %d\n",
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usb_pipeendpoint(pipe), maxp, period);
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}
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}
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return 0;
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}
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/* Submit the interrupt URB if not previously submitted, increasing refcount */
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int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags)
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{
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int ret = 0;
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WARN_ON_ONCE(dev->interrupt == NULL);
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if (dev->interrupt) {
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mutex_lock(&dev->interrupt_mutex);
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if (++dev->interrupt_count == 1)
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ret = usb_submit_urb(dev->interrupt, mem_flags);
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dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n",
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dev->interrupt_count);
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mutex_unlock(&dev->interrupt_mutex);
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(usbnet_status_start);
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/* For resume; submit interrupt URB if previously submitted */
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static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags)
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{
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int ret = 0;
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mutex_lock(&dev->interrupt_mutex);
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if (dev->interrupt_count) {
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ret = usb_submit_urb(dev->interrupt, mem_flags);
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dev_dbg(&dev->udev->dev,
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"submitted interrupt URB for resume\n");
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}
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mutex_unlock(&dev->interrupt_mutex);
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return ret;
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}
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/* Kill the interrupt URB if all submitters want it killed */
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void usbnet_status_stop(struct usbnet *dev)
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{
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if (dev->interrupt) {
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mutex_lock(&dev->interrupt_mutex);
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WARN_ON(dev->interrupt_count == 0);
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if (dev->interrupt_count && --dev->interrupt_count == 0)
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usb_kill_urb(dev->interrupt);
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dev_dbg(&dev->udev->dev,
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"decremented interrupt URB count to %d\n",
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dev->interrupt_count);
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mutex_unlock(&dev->interrupt_mutex);
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}
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}
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EXPORT_SYMBOL_GPL(usbnet_status_stop);
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/* For suspend; always kill interrupt URB */
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static void __usbnet_status_stop_force(struct usbnet *dev)
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{
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if (dev->interrupt) {
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mutex_lock(&dev->interrupt_mutex);
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usb_kill_urb(dev->interrupt);
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dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n");
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mutex_unlock(&dev->interrupt_mutex);
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}
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}
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/* Passes this packet up the stack, updating its accounting.
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* Some link protocols batch packets, so their rx_fixup paths
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* can return clones as well as just modify the original skb.
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*/
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void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
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{
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struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->net->tstats);
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unsigned long flags;
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int status;
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if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
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skb_queue_tail(&dev->rxq_pause, skb);
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return;
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}
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/* only update if unset to allow minidriver rx_fixup override */
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if (skb->protocol == 0)
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skb->protocol = eth_type_trans (skb, dev->net);
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flags = u64_stats_update_begin_irqsave(&stats64->syncp);
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u64_stats_inc(&stats64->rx_packets);
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u64_stats_add(&stats64->rx_bytes, skb->len);
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u64_stats_update_end_irqrestore(&stats64->syncp, flags);
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netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
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skb->len + sizeof (struct ethhdr), skb->protocol);
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memset (skb->cb, 0, sizeof (struct skb_data));
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if (skb_defer_rx_timestamp(skb))
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return;
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status = netif_rx (skb);
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if (status != NET_RX_SUCCESS)
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netif_dbg(dev, rx_err, dev->net,
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"netif_rx status %d\n", status);
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}
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EXPORT_SYMBOL_GPL(usbnet_skb_return);
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/* must be called if hard_mtu or rx_urb_size changed */
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void usbnet_update_max_qlen(struct usbnet *dev)
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{
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enum usb_device_speed speed = dev->udev->speed;
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if (!dev->rx_urb_size || !dev->hard_mtu)
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goto insanity;
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switch (speed) {
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case USB_SPEED_HIGH:
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dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size;
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dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;
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break;
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case USB_SPEED_SUPER:
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case USB_SPEED_SUPER_PLUS:
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/*
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* Not take default 5ms qlen for super speed HC to
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* save memory, and iperf tests show 2.5ms qlen can
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* work well
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*/
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dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size;
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dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu;
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break;
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default:
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insanity:
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dev->rx_qlen = dev->tx_qlen = 4;
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}
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}
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EXPORT_SYMBOL_GPL(usbnet_update_max_qlen);
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/*-------------------------------------------------------------------------
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*
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* Network Device Driver (peer link to "Host Device", from USB host)
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*
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*-------------------------------------------------------------------------*/
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int usbnet_change_mtu (struct net_device *net, int new_mtu)
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{
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struct usbnet *dev = netdev_priv(net);
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int ll_mtu = new_mtu + net->hard_header_len;
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int old_hard_mtu = dev->hard_mtu;
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int old_rx_urb_size = dev->rx_urb_size;
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// no second zero-length packet read wanted after mtu-sized packets
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if ((ll_mtu % dev->maxpacket) == 0)
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return -EDOM;
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net->mtu = new_mtu;
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dev->hard_mtu = net->mtu + net->hard_header_len;
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if (dev->rx_urb_size == old_hard_mtu) {
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dev->rx_urb_size = dev->hard_mtu;
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if (dev->rx_urb_size > old_rx_urb_size) {
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usbnet_pause_rx(dev);
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usbnet_unlink_rx_urbs(dev);
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usbnet_resume_rx(dev);
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}
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}
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/* max qlen depend on hard_mtu and rx_urb_size */
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usbnet_update_max_qlen(dev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(usbnet_change_mtu);
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/* The caller must hold list->lock */
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static void __usbnet_queue_skb(struct sk_buff_head *list,
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struct sk_buff *newsk, enum skb_state state)
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{
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struct skb_data *entry = (struct skb_data *) newsk->cb;
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__skb_queue_tail(list, newsk);
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entry->state = state;
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}
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/*-------------------------------------------------------------------------*/
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/* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
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* completion callbacks. 2.5 should have fixed those bugs...
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*/
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static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
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struct sk_buff_head *list, enum skb_state state)
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{
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unsigned long flags;
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enum skb_state old_state;
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struct skb_data *entry = (struct skb_data *) skb->cb;
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spin_lock_irqsave(&list->lock, flags);
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old_state = entry->state;
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entry->state = state;
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|
__skb_unlink(skb, list);
|
|
|
|
/* defer_bh() is never called with list == &dev->done.
|
|
* spin_lock_nested() tells lockdep that it is OK to take
|
|
* dev->done.lock here with list->lock held.
|
|
*/
|
|
spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING);
|
|
|
|
__skb_queue_tail(&dev->done, skb);
|
|
if (dev->done.qlen == 1)
|
|
tasklet_schedule(&dev->bh);
|
|
spin_unlock(&dev->done.lock);
|
|
spin_unlock_irqrestore(&list->lock, flags);
|
|
return old_state;
|
|
}
|
|
|
|
/* some work can't be done in tasklets, so we use keventd
|
|
*
|
|
* NOTE: annoying asymmetry: if it's active, schedule_work() fails,
|
|
* but tasklet_schedule() doesn't. hope the failure is rare.
|
|
*/
|
|
void usbnet_defer_kevent (struct usbnet *dev, int work)
|
|
{
|
|
set_bit (work, &dev->flags);
|
|
if (!schedule_work (&dev->kevent))
|
|
netdev_dbg(dev->net, "kevent %s may have been dropped\n", usbnet_event_names[work]);
|
|
else
|
|
netdev_dbg(dev->net, "kevent %s scheduled\n", usbnet_event_names[work]);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static void rx_complete (struct urb *urb);
|
|
|
|
static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct skb_data *entry;
|
|
int retval = 0;
|
|
unsigned long lockflags;
|
|
size_t size = dev->rx_urb_size;
|
|
|
|
/* prevent rx skb allocation when error ratio is high */
|
|
if (test_bit(EVENT_RX_KILL, &dev->flags)) {
|
|
usb_free_urb(urb);
|
|
return -ENOLINK;
|
|
}
|
|
|
|
if (test_bit(EVENT_NO_IP_ALIGN, &dev->flags))
|
|
skb = __netdev_alloc_skb(dev->net, size, flags);
|
|
else
|
|
skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
|
|
if (!skb) {
|
|
netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
|
|
usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
|
|
usb_free_urb (urb);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
entry = (struct skb_data *) skb->cb;
|
|
entry->urb = urb;
|
|
entry->dev = dev;
|
|
entry->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_DEV_OPEN, &dev->flags) &&
|
|
!test_bit (EVENT_RX_HALT, &dev->flags) &&
|
|
!test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
|
|
switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
|
|
case -EPIPE:
|
|
usbnet_defer_kevent (dev, EVENT_RX_HALT);
|
|
break;
|
|
case -ENOMEM:
|
|
usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
|
|
break;
|
|
case -ENODEV:
|
|
netif_dbg(dev, ifdown, dev->net, "device gone\n");
|
|
netif_device_detach (dev->net);
|
|
break;
|
|
case -EHOSTUNREACH:
|
|
retval = -ENOLINK;
|
|
break;
|
|
default:
|
|
netif_dbg(dev, rx_err, dev->net,
|
|
"rx submit, %d\n", retval);
|
|
tasklet_schedule (&dev->bh);
|
|
break;
|
|
case 0:
|
|
__usbnet_queue_skb(&dev->rxq, skb, rx_start);
|
|
}
|
|
} else {
|
|
netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
|
|
retval = -ENOLINK;
|
|
}
|
|
spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
|
|
if (retval) {
|
|
dev_kfree_skb_any (skb);
|
|
usb_free_urb (urb);
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static inline int rx_process(struct usbnet *dev, struct sk_buff *skb)
|
|
{
|
|
if (dev->driver_info->rx_fixup &&
|
|
!dev->driver_info->rx_fixup (dev, skb)) {
|
|
/* With RX_ASSEMBLE, rx_fixup() must update counters */
|
|
if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
|
|
dev->net->stats.rx_errors++;
|
|
return -EPROTO;
|
|
}
|
|
// else network stack removes extra byte if we forced a short packet
|
|
|
|
/* all data was already cloned from skb inside the driver */
|
|
if (dev->driver_info->flags & FLAG_MULTI_PACKET)
|
|
return -EALREADY;
|
|
|
|
if (skb->len < ETH_HLEN) {
|
|
dev->net->stats.rx_errors++;
|
|
dev->net->stats.rx_length_errors++;
|
|
netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len);
|
|
return -EPROTO;
|
|
}
|
|
|
|
usbnet_skb_return(dev, skb);
|
|
return 0;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
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;
|
|
enum skb_state state;
|
|
|
|
skb_put (skb, urb->actual_length);
|
|
state = rx_done;
|
|
entry->urb = NULL;
|
|
|
|
switch (urb_status) {
|
|
/* success */
|
|
case 0:
|
|
break;
|
|
|
|
/* stalls need manual reset. this is rare ... except that
|
|
* when going through USB 2.0 TTs, unplug appears this way.
|
|
* we avoid the highspeed version of the ETIMEDOUT/EILSEQ
|
|
* storm, recovering as needed.
|
|
*/
|
|
case -EPIPE:
|
|
dev->net->stats.rx_errors++;
|
|
usbnet_defer_kevent (dev, EVENT_RX_HALT);
|
|
fallthrough;
|
|
|
|
/* software-driven interface shutdown */
|
|
case -ECONNRESET: /* async unlink */
|
|
case -ESHUTDOWN: /* hardware gone */
|
|
netif_dbg(dev, ifdown, dev->net,
|
|
"rx shutdown, code %d\n", urb_status);
|
|
goto block;
|
|
|
|
/* we get controller i/o faults during hub_wq disconnect() delays.
|
|
* throttle down resubmits, to avoid log floods; just temporarily,
|
|
* so we still recover when the fault isn't a hub_wq delay.
|
|
*/
|
|
case -EPROTO:
|
|
case -ETIME:
|
|
case -EILSEQ:
|
|
dev->net->stats.rx_errors++;
|
|
if (!timer_pending (&dev->delay)) {
|
|
mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
|
|
netif_dbg(dev, link, dev->net,
|
|
"rx throttle %d\n", urb_status);
|
|
}
|
|
block:
|
|
state = rx_cleanup;
|
|
entry->urb = urb;
|
|
urb = NULL;
|
|
break;
|
|
|
|
/* data overrun ... flush fifo? */
|
|
case -EOVERFLOW:
|
|
dev->net->stats.rx_over_errors++;
|
|
fallthrough;
|
|
|
|
default:
|
|
state = rx_cleanup;
|
|
dev->net->stats.rx_errors++;
|
|
netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
|
|
break;
|
|
}
|
|
|
|
/* stop rx if packet error rate is high */
|
|
if (++dev->pkt_cnt > 30) {
|
|
dev->pkt_cnt = 0;
|
|
dev->pkt_err = 0;
|
|
} else {
|
|
if (state == rx_cleanup)
|
|
dev->pkt_err++;
|
|
if (dev->pkt_err > 20)
|
|
set_bit(EVENT_RX_KILL, &dev->flags);
|
|
}
|
|
|
|
state = defer_bh(dev, skb, &dev->rxq, state);
|
|
|
|
if (urb) {
|
|
if (netif_running (dev->net) &&
|
|
!test_bit (EVENT_RX_HALT, &dev->flags) &&
|
|
state != unlink_start) {
|
|
rx_submit (dev, urb, GFP_ATOMIC);
|
|
usb_mark_last_busy(dev->udev);
|
|
return;
|
|
}
|
|
usb_free_urb (urb);
|
|
}
|
|
netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
void usbnet_pause_rx(struct usbnet *dev)
|
|
{
|
|
set_bit(EVENT_RX_PAUSED, &dev->flags);
|
|
|
|
netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_pause_rx);
|
|
|
|
void usbnet_resume_rx(struct usbnet *dev)
|
|
{
|
|
struct sk_buff *skb;
|
|
int num = 0;
|
|
|
|
clear_bit(EVENT_RX_PAUSED, &dev->flags);
|
|
|
|
while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
|
|
usbnet_skb_return(dev, skb);
|
|
num++;
|
|
}
|
|
|
|
tasklet_schedule(&dev->bh);
|
|
|
|
netif_dbg(dev, rx_status, dev->net,
|
|
"paused rx queue disabled, %d skbs requeued\n", num);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_resume_rx);
|
|
|
|
void usbnet_purge_paused_rxq(struct usbnet *dev)
|
|
{
|
|
skb_queue_purge(&dev->rxq_pause);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
// unlink pending rx/tx; completion handlers do all other cleanup
|
|
|
|
static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
|
|
{
|
|
unsigned long flags;
|
|
struct sk_buff *skb;
|
|
int count = 0;
|
|
|
|
spin_lock_irqsave (&q->lock, flags);
|
|
while (!skb_queue_empty(q)) {
|
|
struct skb_data *entry;
|
|
struct urb *urb;
|
|
int retval;
|
|
|
|
skb_queue_walk(q, skb) {
|
|
entry = (struct skb_data *) skb->cb;
|
|
if (entry->state != unlink_start)
|
|
goto found;
|
|
}
|
|
break;
|
|
found:
|
|
entry->state = unlink_start;
|
|
urb = entry->urb;
|
|
|
|
/*
|
|
* Get reference count of the URB to avoid it to be
|
|
* freed during usb_unlink_urb, which may trigger
|
|
* use-after-free problem inside usb_unlink_urb since
|
|
* usb_unlink_urb is always racing with .complete
|
|
* handler(include defer_bh).
|
|
*/
|
|
usb_get_urb(urb);
|
|
spin_unlock_irqrestore(&q->lock, flags);
|
|
// during some PM-driven resume scenarios,
|
|
// these (async) unlinks complete immediately
|
|
retval = usb_unlink_urb (urb);
|
|
if (retval != -EINPROGRESS && retval != 0)
|
|
netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
|
|
else
|
|
count++;
|
|
usb_put_urb(urb);
|
|
spin_lock_irqsave(&q->lock, flags);
|
|
}
|
|
spin_unlock_irqrestore (&q->lock, flags);
|
|
return count;
|
|
}
|
|
|
|
// Flush all pending rx urbs
|
|
// minidrivers may need to do this when the MTU changes
|
|
|
|
void usbnet_unlink_rx_urbs(struct usbnet *dev)
|
|
{
|
|
if (netif_running(dev->net)) {
|
|
(void) unlink_urbs (dev, &dev->rxq);
|
|
tasklet_schedule(&dev->bh);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static void wait_skb_queue_empty(struct sk_buff_head *q)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&q->lock, flags);
|
|
while (!skb_queue_empty(q)) {
|
|
spin_unlock_irqrestore(&q->lock, flags);
|
|
schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
spin_lock_irqsave(&q->lock, flags);
|
|
}
|
|
spin_unlock_irqrestore(&q->lock, flags);
|
|
}
|
|
|
|
// precondition: never called in_interrupt
|
|
static void usbnet_terminate_urbs(struct usbnet *dev)
|
|
{
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
int temp;
|
|
|
|
/* ensure there are no more active urbs */
|
|
add_wait_queue(&dev->wait, &wait);
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
temp = unlink_urbs(dev, &dev->txq) +
|
|
unlink_urbs(dev, &dev->rxq);
|
|
|
|
/* maybe wait for deletions to finish. */
|
|
wait_skb_queue_empty(&dev->rxq);
|
|
wait_skb_queue_empty(&dev->txq);
|
|
wait_skb_queue_empty(&dev->done);
|
|
netif_dbg(dev, ifdown, dev->net,
|
|
"waited for %d urb completions\n", temp);
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&dev->wait, &wait);
|
|
}
|
|
|
|
int usbnet_stop (struct net_device *net)
|
|
{
|
|
struct usbnet *dev = netdev_priv(net);
|
|
const struct driver_info *info = dev->driver_info;
|
|
int retval, pm, mpn;
|
|
|
|
clear_bit(EVENT_DEV_OPEN, &dev->flags);
|
|
netif_stop_queue (net);
|
|
|
|
netif_info(dev, ifdown, dev->net,
|
|
"stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
|
|
net->stats.rx_packets, net->stats.tx_packets,
|
|
net->stats.rx_errors, net->stats.tx_errors);
|
|
|
|
/* to not race resume */
|
|
pm = usb_autopm_get_interface(dev->intf);
|
|
/* allow minidriver to stop correctly (wireless devices to turn off
|
|
* radio etc) */
|
|
if (info->stop) {
|
|
retval = info->stop(dev);
|
|
if (retval < 0)
|
|
netif_info(dev, ifdown, dev->net,
|
|
"stop fail (%d) usbnet usb-%s-%s, %s\n",
|
|
retval,
|
|
dev->udev->bus->bus_name, dev->udev->devpath,
|
|
info->description);
|
|
}
|
|
|
|
if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
|
|
usbnet_terminate_urbs(dev);
|
|
|
|
usbnet_status_stop(dev);
|
|
|
|
usbnet_purge_paused_rxq(dev);
|
|
|
|
mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
|
|
|
|
/* deferred work (timer, softirq, task) must also stop */
|
|
dev->flags = 0;
|
|
del_timer_sync (&dev->delay);
|
|
tasklet_kill (&dev->bh);
|
|
cancel_work_sync(&dev->kevent);
|
|
if (!pm)
|
|
usb_autopm_put_interface(dev->intf);
|
|
|
|
if (info->manage_power && mpn)
|
|
info->manage_power(dev, 0);
|
|
else
|
|
usb_autopm_put_interface(dev->intf);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_stop);
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
// posts reads, and enables write queuing
|
|
|
|
// precondition: never called in_interrupt
|
|
|
|
int usbnet_open (struct net_device *net)
|
|
{
|
|
struct usbnet *dev = netdev_priv(net);
|
|
int retval;
|
|
const struct driver_info *info = dev->driver_info;
|
|
|
|
if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
|
|
netif_info(dev, ifup, dev->net,
|
|
"resumption fail (%d) usbnet usb-%s-%s, %s\n",
|
|
retval,
|
|
dev->udev->bus->bus_name,
|
|
dev->udev->devpath,
|
|
info->description);
|
|
goto done_nopm;
|
|
}
|
|
|
|
// put into "known safe" state
|
|
if (info->reset && (retval = info->reset (dev)) < 0) {
|
|
netif_info(dev, ifup, dev->net,
|
|
"open reset fail (%d) usbnet usb-%s-%s, %s\n",
|
|
retval,
|
|
dev->udev->bus->bus_name,
|
|
dev->udev->devpath,
|
|
info->description);
|
|
goto done;
|
|
}
|
|
|
|
/* hard_mtu or rx_urb_size may change in reset() */
|
|
usbnet_update_max_qlen(dev);
|
|
|
|
// insist peer be connected
|
|
if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
|
|
netif_err(dev, ifup, dev->net, "can't open; %d\n", retval);
|
|
goto done;
|
|
}
|
|
|
|
/* start any status interrupt transfer */
|
|
if (dev->interrupt) {
|
|
retval = usbnet_status_start(dev, GFP_KERNEL);
|
|
if (retval < 0) {
|
|
netif_err(dev, ifup, dev->net,
|
|
"intr submit %d\n", retval);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
set_bit(EVENT_DEV_OPEN, &dev->flags);
|
|
netif_start_queue (net);
|
|
netif_info(dev, ifup, dev->net,
|
|
"open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
|
|
(int)RX_QLEN(dev), (int)TX_QLEN(dev),
|
|
dev->net->mtu,
|
|
(dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
|
|
(dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
|
|
(dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
|
|
(dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
|
|
(dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
|
|
"simple");
|
|
|
|
/* reset rx error state */
|
|
dev->pkt_cnt = 0;
|
|
dev->pkt_err = 0;
|
|
clear_bit(EVENT_RX_KILL, &dev->flags);
|
|
|
|
// delay posting reads until we're fully open
|
|
tasklet_schedule (&dev->bh);
|
|
if (info->manage_power) {
|
|
retval = info->manage_power(dev, 1);
|
|
if (retval < 0) {
|
|
retval = 0;
|
|
set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
|
|
} else {
|
|
usb_autopm_put_interface(dev->intf);
|
|
}
|
|
}
|
|
return retval;
|
|
done:
|
|
usb_autopm_put_interface(dev->intf);
|
|
done_nopm:
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_open);
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* ethtool methods; minidrivers may need to add some more, but
|
|
* they'll probably want to use this base set.
|
|
*/
|
|
|
|
/* These methods are written on the assumption that the device
|
|
* uses MII
|
|
*/
|
|
int usbnet_get_link_ksettings_mii(struct net_device *net,
|
|
struct ethtool_link_ksettings *cmd)
|
|
{
|
|
struct usbnet *dev = netdev_priv(net);
|
|
|
|
if (!dev->mii.mdio_read)
|
|
return -EOPNOTSUPP;
|
|
|
|
mii_ethtool_get_link_ksettings(&dev->mii, cmd);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings_mii);
|
|
|
|
int usbnet_get_link_ksettings_internal(struct net_device *net,
|
|
struct ethtool_link_ksettings *cmd)
|
|
{
|
|
struct usbnet *dev = netdev_priv(net);
|
|
|
|
/* the assumption that speed is equal on tx and rx
|
|
* is deeply engrained into the networking layer.
|
|
* For wireless stuff it is not true.
|
|
* We assume that rx_speed matters more.
|
|
*/
|
|
if (dev->rx_speed != SPEED_UNSET)
|
|
cmd->base.speed = dev->rx_speed / 1000000;
|
|
else if (dev->tx_speed != SPEED_UNSET)
|
|
cmd->base.speed = dev->tx_speed / 1000000;
|
|
else
|
|
cmd->base.speed = SPEED_UNKNOWN;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings_internal);
|
|
|
|
int usbnet_set_link_ksettings_mii(struct net_device *net,
|
|
const struct ethtool_link_ksettings *cmd)
|
|
{
|
|
struct usbnet *dev = netdev_priv(net);
|
|
int retval;
|
|
|
|
if (!dev->mii.mdio_write)
|
|
return -EOPNOTSUPP;
|
|
|
|
retval = mii_ethtool_set_link_ksettings(&dev->mii, cmd);
|
|
|
|
/* link speed/duplex might have changed */
|
|
if (dev->driver_info->link_reset)
|
|
dev->driver_info->link_reset(dev);
|
|
|
|
/* hard_mtu or rx_urb_size may change in link_reset() */
|
|
usbnet_update_max_qlen(dev);
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_set_link_ksettings_mii);
|
|
|
|
u32 usbnet_get_link (struct net_device *net)
|
|
{
|
|
struct usbnet *dev = netdev_priv(net);
|
|
|
|
/* If a check_connect is defined, return its result */
|
|
if (dev->driver_info->check_connect)
|
|
return dev->driver_info->check_connect (dev) == 0;
|
|
|
|
/* if the device has mii operations, use those */
|
|
if (dev->mii.mdio_read)
|
|
return mii_link_ok(&dev->mii);
|
|
|
|
/* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
|
|
return ethtool_op_get_link(net);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_get_link);
|
|
|
|
int usbnet_nway_reset(struct net_device *net)
|
|
{
|
|
struct usbnet *dev = netdev_priv(net);
|
|
|
|
if (!dev->mii.mdio_write)
|
|
return -EOPNOTSUPP;
|
|
|
|
return mii_nway_restart(&dev->mii);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_nway_reset);
|
|
|
|
void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
|
|
{
|
|
struct usbnet *dev = netdev_priv(net);
|
|
|
|
strscpy(info->driver, dev->driver_name, sizeof(info->driver));
|
|
strscpy(info->fw_version, dev->driver_info->description,
|
|
sizeof(info->fw_version));
|
|
usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
|
|
|
|
u32 usbnet_get_msglevel (struct net_device *net)
|
|
{
|
|
struct usbnet *dev = netdev_priv(net);
|
|
|
|
return dev->msg_enable;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
|
|
|
|
void usbnet_set_msglevel (struct net_device *net, u32 level)
|
|
{
|
|
struct usbnet *dev = netdev_priv(net);
|
|
|
|
dev->msg_enable = level;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
|
|
|
|
/* drivers may override default ethtool_ops in their bind() routine */
|
|
static const struct ethtool_ops usbnet_ethtool_ops = {
|
|
.get_link = usbnet_get_link,
|
|
.nway_reset = usbnet_nway_reset,
|
|
.get_drvinfo = usbnet_get_drvinfo,
|
|
.get_msglevel = usbnet_get_msglevel,
|
|
.set_msglevel = usbnet_set_msglevel,
|
|
.get_ts_info = ethtool_op_get_ts_info,
|
|
.get_link_ksettings = usbnet_get_link_ksettings_mii,
|
|
.set_link_ksettings = usbnet_set_link_ksettings_mii,
|
|
};
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static void __handle_link_change(struct usbnet *dev)
|
|
{
|
|
if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
|
|
return;
|
|
|
|
if (!netif_carrier_ok(dev->net)) {
|
|
/* kill URBs for reading packets to save bus bandwidth */
|
|
unlink_urbs(dev, &dev->rxq);
|
|
|
|
/*
|
|
* tx_timeout will unlink URBs for sending packets and
|
|
* tx queue is stopped by netcore after link becomes off
|
|
*/
|
|
} else {
|
|
/* submitting URBs for reading packets */
|
|
tasklet_schedule(&dev->bh);
|
|
}
|
|
|
|
/* hard_mtu or rx_urb_size may change during link change */
|
|
usbnet_update_max_qlen(dev);
|
|
|
|
clear_bit(EVENT_LINK_CHANGE, &dev->flags);
|
|
}
|
|
|
|
void usbnet_set_rx_mode(struct net_device *net)
|
|
{
|
|
struct usbnet *dev = netdev_priv(net);
|
|
|
|
usbnet_defer_kevent(dev, EVENT_SET_RX_MODE);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_set_rx_mode);
|
|
|
|
static void __handle_set_rx_mode(struct usbnet *dev)
|
|
{
|
|
if (dev->driver_info->set_rx_mode)
|
|
(dev->driver_info->set_rx_mode)(dev);
|
|
|
|
clear_bit(EVENT_SET_RX_MODE, &dev->flags);
|
|
}
|
|
|
|
/* 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
|
|
usbnet_deferred_kevent (struct work_struct *work)
|
|
{
|
|
struct usbnet *dev =
|
|
container_of(work, struct usbnet, kevent);
|
|
int status;
|
|
|
|
/* usb_clear_halt() needs a thread context */
|
|
if (test_bit (EVENT_TX_HALT, &dev->flags)) {
|
|
unlink_urbs (dev, &dev->txq);
|
|
status = usb_autopm_get_interface(dev->intf);
|
|
if (status < 0)
|
|
goto fail_pipe;
|
|
status = usb_clear_halt (dev->udev, dev->out);
|
|
usb_autopm_put_interface(dev->intf);
|
|
if (status < 0 &&
|
|
status != -EPIPE &&
|
|
status != -ESHUTDOWN) {
|
|
if (netif_msg_tx_err (dev))
|
|
fail_pipe:
|
|
netdev_err(dev->net, "can't clear tx halt, status %d\n",
|
|
status);
|
|
} else {
|
|
clear_bit (EVENT_TX_HALT, &dev->flags);
|
|
if (status != -ESHUTDOWN)
|
|
netif_wake_queue (dev->net);
|
|
}
|
|
}
|
|
if (test_bit (EVENT_RX_HALT, &dev->flags)) {
|
|
unlink_urbs (dev, &dev->rxq);
|
|
status = usb_autopm_get_interface(dev->intf);
|
|
if (status < 0)
|
|
goto fail_halt;
|
|
status = usb_clear_halt (dev->udev, dev->in);
|
|
usb_autopm_put_interface(dev->intf);
|
|
if (status < 0 &&
|
|
status != -EPIPE &&
|
|
status != -ESHUTDOWN) {
|
|
if (netif_msg_rx_err (dev))
|
|
fail_halt:
|
|
netdev_err(dev->net, "can't clear rx halt, status %d\n",
|
|
status);
|
|
} else {
|
|
clear_bit (EVENT_RX_HALT, &dev->flags);
|
|
tasklet_schedule (&dev->bh);
|
|
}
|
|
}
|
|
|
|
/* tasklet could resubmit itself forever if memory is tight */
|
|
if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
|
|
struct urb *urb = NULL;
|
|
int resched = 1;
|
|
|
|
if (netif_running (dev->net))
|
|
urb = usb_alloc_urb (0, GFP_KERNEL);
|
|
else
|
|
clear_bit (EVENT_RX_MEMORY, &dev->flags);
|
|
if (urb != NULL) {
|
|
clear_bit (EVENT_RX_MEMORY, &dev->flags);
|
|
status = usb_autopm_get_interface(dev->intf);
|
|
if (status < 0) {
|
|
usb_free_urb(urb);
|
|
goto fail_lowmem;
|
|
}
|
|
if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
|
|
resched = 0;
|
|
usb_autopm_put_interface(dev->intf);
|
|
fail_lowmem:
|
|
if (resched)
|
|
tasklet_schedule (&dev->bh);
|
|
}
|
|
}
|
|
|
|
if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
|
|
const struct driver_info *info = dev->driver_info;
|
|
int retval = 0;
|
|
|
|
clear_bit (EVENT_LINK_RESET, &dev->flags);
|
|
status = usb_autopm_get_interface(dev->intf);
|
|
if (status < 0)
|
|
goto skip_reset;
|
|
if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
|
|
usb_autopm_put_interface(dev->intf);
|
|
skip_reset:
|
|
netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
|
|
retval,
|
|
dev->udev->bus->bus_name,
|
|
dev->udev->devpath,
|
|
info->description);
|
|
} else {
|
|
usb_autopm_put_interface(dev->intf);
|
|
}
|
|
|
|
/* handle link change from link resetting */
|
|
__handle_link_change(dev);
|
|
}
|
|
|
|
if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
|
|
__handle_link_change(dev);
|
|
|
|
if (test_bit (EVENT_SET_RX_MODE, &dev->flags))
|
|
__handle_set_rx_mode(dev);
|
|
|
|
|
|
if (dev->flags)
|
|
netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static void tx_complete (struct urb *urb)
|
|
{
|
|
struct sk_buff *skb = (struct sk_buff *) urb->context;
|
|
struct skb_data *entry = (struct skb_data *) skb->cb;
|
|
struct usbnet *dev = entry->dev;
|
|
|
|
if (urb->status == 0) {
|
|
struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->net->tstats);
|
|
unsigned long flags;
|
|
|
|
flags = u64_stats_update_begin_irqsave(&stats64->syncp);
|
|
u64_stats_add(&stats64->tx_packets, entry->packets);
|
|
u64_stats_add(&stats64->tx_bytes, entry->length);
|
|
u64_stats_update_end_irqrestore(&stats64->syncp, flags);
|
|
} else {
|
|
dev->net->stats.tx_errors++;
|
|
|
|
switch (urb->status) {
|
|
case -EPIPE:
|
|
usbnet_defer_kevent (dev, EVENT_TX_HALT);
|
|
break;
|
|
|
|
/* software-driven interface shutdown */
|
|
case -ECONNRESET: // async unlink
|
|
case -ESHUTDOWN: // hardware gone
|
|
break;
|
|
|
|
/* like rx, tx gets controller i/o faults during hub_wq
|
|
* delays and so it uses the same throttling mechanism.
|
|
*/
|
|
case -EPROTO:
|
|
case -ETIME:
|
|
case -EILSEQ:
|
|
usb_mark_last_busy(dev->udev);
|
|
if (!timer_pending (&dev->delay)) {
|
|
mod_timer (&dev->delay,
|
|
jiffies + THROTTLE_JIFFIES);
|
|
netif_dbg(dev, link, dev->net,
|
|
"tx throttle %d\n", urb->status);
|
|
}
|
|
netif_stop_queue (dev->net);
|
|
break;
|
|
default:
|
|
netif_dbg(dev, tx_err, dev->net,
|
|
"tx err %d\n", entry->urb->status);
|
|
break;
|
|
}
|
|
}
|
|
|
|
usb_autopm_put_interface_async(dev->intf);
|
|
(void) defer_bh(dev, skb, &dev->txq, tx_done);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
void usbnet_tx_timeout (struct net_device *net, unsigned int txqueue)
|
|
{
|
|
struct usbnet *dev = netdev_priv(net);
|
|
|
|
unlink_urbs (dev, &dev->txq);
|
|
tasklet_schedule (&dev->bh);
|
|
/* this needs to be handled individually because the generic layer
|
|
* doesn't know what is sufficient and could not restore private
|
|
* information if a remedy of an unconditional reset were used.
|
|
*/
|
|
if (dev->driver_info->recover)
|
|
(dev->driver_info->recover)(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
|
|
{
|
|
unsigned num_sgs, total_len = 0;
|
|
int i, s = 0;
|
|
|
|
num_sgs = skb_shinfo(skb)->nr_frags + 1;
|
|
if (num_sgs == 1)
|
|
return 0;
|
|
|
|
/* reserve one for zero packet */
|
|
urb->sg = kmalloc_array(num_sgs + 1, sizeof(struct scatterlist),
|
|
GFP_ATOMIC);
|
|
if (!urb->sg)
|
|
return -ENOMEM;
|
|
|
|
urb->num_sgs = num_sgs;
|
|
sg_init_table(urb->sg, urb->num_sgs + 1);
|
|
|
|
sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
|
|
total_len += skb_headlen(skb);
|
|
|
|
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
|
|
skb_frag_t *f = &skb_shinfo(skb)->frags[i];
|
|
|
|
total_len += skb_frag_size(f);
|
|
sg_set_page(&urb->sg[i + s], skb_frag_page(f), skb_frag_size(f),
|
|
skb_frag_off(f));
|
|
}
|
|
urb->transfer_buffer_length = total_len;
|
|
|
|
return 1;
|
|
}
|
|
|
|
netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
|
|
struct net_device *net)
|
|
{
|
|
struct usbnet *dev = netdev_priv(net);
|
|
unsigned int length;
|
|
struct urb *urb = NULL;
|
|
struct skb_data *entry;
|
|
const struct driver_info *info = dev->driver_info;
|
|
unsigned long flags;
|
|
int retval;
|
|
|
|
if (skb)
|
|
skb_tx_timestamp(skb);
|
|
|
|
// some devices want funky USB-level framing, for
|
|
// win32 driver (usually) and/or hardware quirks
|
|
if (info->tx_fixup) {
|
|
skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
|
|
if (!skb) {
|
|
/* packet collected; minidriver waiting for more */
|
|
if (info->flags & FLAG_MULTI_PACKET)
|
|
goto not_drop;
|
|
netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
|
|
goto drop;
|
|
}
|
|
}
|
|
|
|
if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
|
|
netif_dbg(dev, tx_err, dev->net, "no urb\n");
|
|
goto drop;
|
|
}
|
|
|
|
entry = (struct skb_data *) skb->cb;
|
|
entry->urb = urb;
|
|
entry->dev = dev;
|
|
|
|
usb_fill_bulk_urb (urb, dev->udev, dev->out,
|
|
skb->data, skb->len, tx_complete, skb);
|
|
if (dev->can_dma_sg) {
|
|
if (build_dma_sg(skb, urb) < 0)
|
|
goto drop;
|
|
}
|
|
length = urb->transfer_buffer_length;
|
|
|
|
/* don't assume the hardware handles USB_ZERO_PACKET
|
|
* NOTE: strictly conforming cdc-ether devices should expect
|
|
* the ZLP here, but ignore the one-byte packet.
|
|
* NOTE2: CDC NCM specification is different from CDC ECM when
|
|
* handling ZLP/short packets, so cdc_ncm driver will make short
|
|
* packet itself if needed.
|
|
*/
|
|
if (length % dev->maxpacket == 0) {
|
|
if (!(info->flags & FLAG_SEND_ZLP)) {
|
|
if (!(info->flags & FLAG_MULTI_PACKET)) {
|
|
length++;
|
|
if (skb_tailroom(skb) && !urb->num_sgs) {
|
|
skb->data[skb->len] = 0;
|
|
__skb_put(skb, 1);
|
|
} else if (urb->num_sgs)
|
|
sg_set_buf(&urb->sg[urb->num_sgs++],
|
|
dev->padding_pkt, 1);
|
|
}
|
|
} else
|
|
urb->transfer_flags |= URB_ZERO_PACKET;
|
|
}
|
|
urb->transfer_buffer_length = length;
|
|
|
|
if (info->flags & FLAG_MULTI_PACKET) {
|
|
/* Driver has set number of packets and a length delta.
|
|
* Calculate the complete length and ensure that it's
|
|
* positive.
|
|
*/
|
|
entry->length += length;
|
|
if (WARN_ON_ONCE(entry->length <= 0))
|
|
entry->length = length;
|
|
} else {
|
|
usbnet_set_skb_tx_stats(skb, 1, length);
|
|
}
|
|
|
|
spin_lock_irqsave(&dev->txq.lock, flags);
|
|
retval = usb_autopm_get_interface_async(dev->intf);
|
|
if (retval < 0) {
|
|
spin_unlock_irqrestore(&dev->txq.lock, flags);
|
|
goto drop;
|
|
}
|
|
if (netif_queue_stopped(net)) {
|
|
usb_autopm_put_interface_async(dev->intf);
|
|
spin_unlock_irqrestore(&dev->txq.lock, flags);
|
|
goto drop;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
/* if this triggers the device is still a sleep */
|
|
if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
|
|
/* transmission will be done in resume */
|
|
usb_anchor_urb(urb, &dev->deferred);
|
|
/* no use to process more packets */
|
|
netif_stop_queue(net);
|
|
usb_put_urb(urb);
|
|
spin_unlock_irqrestore(&dev->txq.lock, flags);
|
|
netdev_dbg(dev->net, "Delaying transmission for resumption\n");
|
|
goto deferred;
|
|
}
|
|
#endif
|
|
|
|
switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
|
|
case -EPIPE:
|
|
netif_stop_queue (net);
|
|
usbnet_defer_kevent (dev, EVENT_TX_HALT);
|
|
usb_autopm_put_interface_async(dev->intf);
|
|
break;
|
|
default:
|
|
usb_autopm_put_interface_async(dev->intf);
|
|
netif_dbg(dev, tx_err, dev->net,
|
|
"tx: submit urb err %d\n", retval);
|
|
break;
|
|
case 0:
|
|
netif_trans_update(net);
|
|
__usbnet_queue_skb(&dev->txq, skb, tx_start);
|
|
if (dev->txq.qlen >= TX_QLEN (dev))
|
|
netif_stop_queue (net);
|
|
}
|
|
spin_unlock_irqrestore (&dev->txq.lock, flags);
|
|
|
|
if (retval) {
|
|
netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
|
|
drop:
|
|
dev->net->stats.tx_dropped++;
|
|
not_drop:
|
|
if (skb)
|
|
dev_kfree_skb_any (skb);
|
|
if (urb) {
|
|
kfree(urb->sg);
|
|
usb_free_urb(urb);
|
|
}
|
|
} else
|
|
netif_dbg(dev, tx_queued, dev->net,
|
|
"> tx, len %u, type 0x%x\n", length, skb->protocol);
|
|
#ifdef CONFIG_PM
|
|
deferred:
|
|
#endif
|
|
return NETDEV_TX_OK;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_start_xmit);
|
|
|
|
static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
|
|
{
|
|
struct urb *urb;
|
|
int i;
|
|
int ret = 0;
|
|
|
|
/* don't refill the queue all at once */
|
|
for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
|
|
urb = usb_alloc_urb(0, flags);
|
|
if (urb != NULL) {
|
|
ret = rx_submit(dev, urb, flags);
|
|
if (ret)
|
|
goto err;
|
|
} else {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
}
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
static inline void usb_free_skb(struct sk_buff *skb)
|
|
{
|
|
struct skb_data *entry = (struct skb_data *)skb->cb;
|
|
|
|
usb_free_urb(entry->urb);
|
|
dev_kfree_skb(skb);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
// tasklet (work deferred from completions, in_irq) or timer
|
|
|
|
static void usbnet_bh (struct timer_list *t)
|
|
{
|
|
struct usbnet *dev = from_timer(dev, t, delay);
|
|
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:
|
|
if (rx_process(dev, skb))
|
|
usb_free_skb(skb);
|
|
continue;
|
|
case tx_done:
|
|
kfree(entry->urb->sg);
|
|
fallthrough;
|
|
case rx_cleanup:
|
|
usb_free_skb(skb);
|
|
continue;
|
|
default:
|
|
netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
|
|
}
|
|
}
|
|
|
|
/* restart RX again after disabling due to high error rate */
|
|
clear_bit(EVENT_RX_KILL, &dev->flags);
|
|
|
|
/* waiting for all pending urbs to complete?
|
|
* only then can we forgo submitting anew
|
|
*/
|
|
if (waitqueue_active(&dev->wait)) {
|
|
if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0)
|
|
wake_up_all(&dev->wait);
|
|
|
|
// or are we maybe short a few urbs?
|
|
} else if (netif_running (dev->net) &&
|
|
netif_device_present (dev->net) &&
|
|
netif_carrier_ok(dev->net) &&
|
|
!timer_pending(&dev->delay) &&
|
|
!test_bit(EVENT_RX_PAUSED, &dev->flags) &&
|
|
!test_bit(EVENT_RX_HALT, &dev->flags)) {
|
|
int temp = dev->rxq.qlen;
|
|
|
|
if (temp < RX_QLEN(dev)) {
|
|
if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
|
|
return;
|
|
if (temp != dev->rxq.qlen)
|
|
netif_dbg(dev, link, dev->net,
|
|
"rxqlen %d --> %d\n",
|
|
temp, dev->rxq.qlen);
|
|
if (dev->rxq.qlen < RX_QLEN(dev))
|
|
tasklet_schedule (&dev->bh);
|
|
}
|
|
if (dev->txq.qlen < TX_QLEN (dev))
|
|
netif_wake_queue (dev->net);
|
|
}
|
|
}
|
|
|
|
static void usbnet_bh_tasklet(struct tasklet_struct *t)
|
|
{
|
|
struct usbnet *dev = from_tasklet(dev, t, bh);
|
|
|
|
usbnet_bh(&dev->delay);
|
|
}
|
|
|
|
|
|
/*-------------------------------------------------------------------------
|
|
*
|
|
* 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;
|
|
struct urb *urb;
|
|
|
|
dev = usb_get_intfdata(intf);
|
|
usb_set_intfdata(intf, NULL);
|
|
if (!dev)
|
|
return;
|
|
|
|
xdev = interface_to_usbdev (intf);
|
|
|
|
netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
|
|
intf->dev.driver->name,
|
|
xdev->bus->bus_name, xdev->devpath,
|
|
dev->driver_info->description);
|
|
|
|
net = dev->net;
|
|
unregister_netdev (net);
|
|
|
|
while ((urb = usb_get_from_anchor(&dev->deferred))) {
|
|
dev_kfree_skb(urb->context);
|
|
kfree(urb->sg);
|
|
usb_free_urb(urb);
|
|
}
|
|
|
|
if (dev->driver_info->unbind)
|
|
dev->driver_info->unbind(dev, intf);
|
|
|
|
usb_kill_urb(dev->interrupt);
|
|
usb_free_urb(dev->interrupt);
|
|
kfree(dev->padding_pkt);
|
|
|
|
free_percpu(net->tstats);
|
|
free_netdev(net);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_disconnect);
|
|
|
|
static const struct net_device_ops usbnet_netdev_ops = {
|
|
.ndo_open = usbnet_open,
|
|
.ndo_stop = usbnet_stop,
|
|
.ndo_start_xmit = usbnet_start_xmit,
|
|
.ndo_tx_timeout = usbnet_tx_timeout,
|
|
.ndo_set_rx_mode = usbnet_set_rx_mode,
|
|
.ndo_change_mtu = usbnet_change_mtu,
|
|
.ndo_get_stats64 = dev_get_tstats64,
|
|
.ndo_set_mac_address = eth_mac_addr,
|
|
.ndo_validate_addr = eth_validate_addr,
|
|
};
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
// precondition: never called in_interrupt
|
|
|
|
static struct device_type wlan_type = {
|
|
.name = "wlan",
|
|
};
|
|
|
|
static struct device_type wwan_type = {
|
|
.name = "wwan",
|
|
};
|
|
|
|
int
|
|
usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
|
|
{
|
|
struct usbnet *dev;
|
|
struct net_device *net;
|
|
struct usb_host_interface *interface;
|
|
const struct driver_info *info;
|
|
struct usb_device *xdev;
|
|
int status;
|
|
const char *name;
|
|
struct usb_driver *driver = to_usb_driver(udev->dev.driver);
|
|
|
|
/* usbnet already took usb runtime pm, so have to enable the feature
|
|
* for usb interface, otherwise usb_autopm_get_interface may return
|
|
* failure if RUNTIME_PM is enabled.
|
|
*/
|
|
if (!driver->supports_autosuspend) {
|
|
driver->supports_autosuspend = 1;
|
|
pm_runtime_enable(&udev->dev);
|
|
}
|
|
|
|
name = udev->dev.driver->name;
|
|
info = (const struct driver_info *) prod->driver_info;
|
|
if (!info) {
|
|
dev_dbg (&udev->dev, "blacklisted by %s\n", name);
|
|
return -ENODEV;
|
|
}
|
|
xdev = interface_to_usbdev (udev);
|
|
interface = udev->cur_altsetting;
|
|
|
|
status = -ENOMEM;
|
|
|
|
// set up our own records
|
|
net = alloc_etherdev(sizeof(*dev));
|
|
if (!net)
|
|
goto out;
|
|
|
|
/* netdev_printk() needs this so do it as early as possible */
|
|
SET_NETDEV_DEV(net, &udev->dev);
|
|
|
|
dev = netdev_priv(net);
|
|
dev->udev = xdev;
|
|
dev->intf = udev;
|
|
dev->driver_info = info;
|
|
dev->driver_name = name;
|
|
dev->rx_speed = SPEED_UNSET;
|
|
dev->tx_speed = SPEED_UNSET;
|
|
|
|
net->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
|
|
if (!net->tstats)
|
|
goto out0;
|
|
|
|
dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
|
|
| NETIF_MSG_PROBE | NETIF_MSG_LINK);
|
|
init_waitqueue_head(&dev->wait);
|
|
skb_queue_head_init (&dev->rxq);
|
|
skb_queue_head_init (&dev->txq);
|
|
skb_queue_head_init (&dev->done);
|
|
skb_queue_head_init(&dev->rxq_pause);
|
|
tasklet_setup(&dev->bh, usbnet_bh_tasklet);
|
|
INIT_WORK (&dev->kevent, usbnet_deferred_kevent);
|
|
init_usb_anchor(&dev->deferred);
|
|
timer_setup(&dev->delay, usbnet_bh, 0);
|
|
mutex_init (&dev->phy_mutex);
|
|
mutex_init(&dev->interrupt_mutex);
|
|
dev->interrupt_count = 0;
|
|
|
|
dev->net = net;
|
|
strscpy(net->name, "usb%d", sizeof(net->name));
|
|
eth_hw_addr_set(net, 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;
|
|
net->min_mtu = 0;
|
|
net->max_mtu = ETH_MAX_MTU;
|
|
|
|
net->netdev_ops = &usbnet_netdev_ops;
|
|
net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
|
|
net->ethtool_ops = &usbnet_ethtool_ops;
|
|
|
|
// allow device-specific bind/init procedures
|
|
// NOTE net->name still not usable ...
|
|
if (info->bind) {
|
|
status = info->bind (dev, udev);
|
|
if (status < 0)
|
|
goto out1;
|
|
|
|
// heuristic: "usb%d" for links we know are two-host,
|
|
// else "eth%d" when there's reasonable doubt. userspace
|
|
// can rename the link if it knows better.
|
|
if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
|
|
((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
|
|
(net->dev_addr [0] & 0x02) == 0))
|
|
strscpy(net->name, "eth%d", sizeof(net->name));
|
|
/* WLAN devices should always be named "wlan%d" */
|
|
if ((dev->driver_info->flags & FLAG_WLAN) != 0)
|
|
strscpy(net->name, "wlan%d", sizeof(net->name));
|
|
/* WWAN devices should always be named "wwan%d" */
|
|
if ((dev->driver_info->flags & FLAG_WWAN) != 0)
|
|
strscpy(net->name, "wwan%d", sizeof(net->name));
|
|
|
|
/* devices that cannot do ARP */
|
|
if ((dev->driver_info->flags & FLAG_NOARP) != 0)
|
|
net->flags |= IFF_NOARP;
|
|
|
|
/* 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 {
|
|
u8 ep_addrs[3] = {
|
|
info->in + USB_DIR_IN, info->out + USB_DIR_OUT, 0
|
|
};
|
|
|
|
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 && !usb_check_bulk_endpoints(udev, ep_addrs))
|
|
status = -EINVAL;
|
|
}
|
|
if (status >= 0 && dev->status)
|
|
status = init_status (dev, udev);
|
|
if (status < 0)
|
|
goto out3;
|
|
|
|
if (!dev->rx_urb_size)
|
|
dev->rx_urb_size = dev->hard_mtu;
|
|
dev->maxpacket = usb_maxpacket(dev->udev, dev->out);
|
|
if (dev->maxpacket == 0) {
|
|
/* that is a broken device */
|
|
status = -ENODEV;
|
|
goto out4;
|
|
}
|
|
|
|
/* let userspace know we have a random address */
|
|
if (ether_addr_equal(net->dev_addr, node_id))
|
|
net->addr_assign_type = NET_ADDR_RANDOM;
|
|
|
|
if ((dev->driver_info->flags & FLAG_WLAN) != 0)
|
|
SET_NETDEV_DEVTYPE(net, &wlan_type);
|
|
if ((dev->driver_info->flags & FLAG_WWAN) != 0)
|
|
SET_NETDEV_DEVTYPE(net, &wwan_type);
|
|
|
|
/* initialize max rx_qlen and tx_qlen */
|
|
usbnet_update_max_qlen(dev);
|
|
|
|
if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) &&
|
|
!(info->flags & FLAG_MULTI_PACKET)) {
|
|
dev->padding_pkt = kzalloc(1, GFP_KERNEL);
|
|
if (!dev->padding_pkt) {
|
|
status = -ENOMEM;
|
|
goto out4;
|
|
}
|
|
}
|
|
|
|
status = register_netdev (net);
|
|
if (status)
|
|
goto out5;
|
|
netif_info(dev, probe, dev->net,
|
|
"register '%s' at usb-%s-%s, %s, %pM\n",
|
|
udev->dev.driver->name,
|
|
xdev->bus->bus_name, xdev->devpath,
|
|
dev->driver_info->description,
|
|
net->dev_addr);
|
|
|
|
// ok, it's ready to go.
|
|
usb_set_intfdata (udev, dev);
|
|
|
|
netif_device_attach (net);
|
|
|
|
if (dev->driver_info->flags & FLAG_LINK_INTR)
|
|
usbnet_link_change(dev, 0, 0);
|
|
|
|
return 0;
|
|
|
|
out5:
|
|
kfree(dev->padding_pkt);
|
|
out4:
|
|
usb_free_urb(dev->interrupt);
|
|
out3:
|
|
if (info->unbind)
|
|
info->unbind (dev, udev);
|
|
out1:
|
|
/* subdrivers must undo all they did in bind() if they
|
|
* fail it, but we may fail later and a deferred kevent
|
|
* may trigger an error resubmitting itself and, worse,
|
|
* schedule a timer. So we kill it all just in case.
|
|
*/
|
|
cancel_work_sync(&dev->kevent);
|
|
del_timer_sync(&dev->delay);
|
|
free_percpu(net->tstats);
|
|
out0:
|
|
free_netdev(net);
|
|
out:
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_probe);
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/*
|
|
* suspend the whole driver as soon as the first interface is suspended
|
|
* resume only when the last interface is resumed
|
|
*/
|
|
|
|
int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
|
|
{
|
|
struct usbnet *dev = usb_get_intfdata(intf);
|
|
|
|
if (!dev->suspend_count++) {
|
|
spin_lock_irq(&dev->txq.lock);
|
|
/* don't autosuspend while transmitting */
|
|
if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
|
|
dev->suspend_count--;
|
|
spin_unlock_irq(&dev->txq.lock);
|
|
return -EBUSY;
|
|
} else {
|
|
set_bit(EVENT_DEV_ASLEEP, &dev->flags);
|
|
spin_unlock_irq(&dev->txq.lock);
|
|
}
|
|
/*
|
|
* accelerate emptying of the rx and queues, to avoid
|
|
* having everything error out.
|
|
*/
|
|
netif_device_detach (dev->net);
|
|
usbnet_terminate_urbs(dev);
|
|
__usbnet_status_stop_force(dev);
|
|
|
|
/*
|
|
* reattach so runtime management can use and
|
|
* wake the device
|
|
*/
|
|
netif_device_attach (dev->net);
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_suspend);
|
|
|
|
int usbnet_resume (struct usb_interface *intf)
|
|
{
|
|
struct usbnet *dev = usb_get_intfdata(intf);
|
|
struct sk_buff *skb;
|
|
struct urb *res;
|
|
int retval;
|
|
|
|
if (!--dev->suspend_count) {
|
|
/* resume interrupt URB if it was previously submitted */
|
|
__usbnet_status_start_force(dev, GFP_NOIO);
|
|
|
|
spin_lock_irq(&dev->txq.lock);
|
|
while ((res = usb_get_from_anchor(&dev->deferred))) {
|
|
|
|
skb = (struct sk_buff *)res->context;
|
|
retval = usb_submit_urb(res, GFP_ATOMIC);
|
|
if (retval < 0) {
|
|
dev_kfree_skb_any(skb);
|
|
kfree(res->sg);
|
|
usb_free_urb(res);
|
|
usb_autopm_put_interface_async(dev->intf);
|
|
} else {
|
|
netif_trans_update(dev->net);
|
|
__skb_queue_tail(&dev->txq, skb);
|
|
}
|
|
}
|
|
|
|
smp_mb();
|
|
clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
|
|
spin_unlock_irq(&dev->txq.lock);
|
|
|
|
if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
|
|
/* handle remote wakeup ASAP
|
|
* we cannot race against stop
|
|
*/
|
|
if (netif_device_present(dev->net) &&
|
|
!timer_pending(&dev->delay) &&
|
|
!test_bit(EVENT_RX_HALT, &dev->flags))
|
|
rx_alloc_submit(dev, GFP_NOIO);
|
|
|
|
if (!(dev->txq.qlen >= TX_QLEN(dev)))
|
|
netif_tx_wake_all_queues(dev->net);
|
|
tasklet_schedule (&dev->bh);
|
|
}
|
|
}
|
|
|
|
if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
|
|
usb_autopm_get_interface_no_resume(intf);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_resume);
|
|
|
|
/*
|
|
* Either a subdriver implements manage_power, then it is assumed to always
|
|
* be ready to be suspended or it reports the readiness to be suspended
|
|
* explicitly
|
|
*/
|
|
void usbnet_device_suggests_idle(struct usbnet *dev)
|
|
{
|
|
if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
|
|
dev->intf->needs_remote_wakeup = 1;
|
|
usb_autopm_put_interface_async(dev->intf);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(usbnet_device_suggests_idle);
|
|
|
|
/*
|
|
* For devices that can do without special commands
|
|
*/
|
|
int usbnet_manage_power(struct usbnet *dev, int on)
|
|
{
|
|
dev->intf->needs_remote_wakeup = on;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(usbnet_manage_power);
|
|
|
|
void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
|
|
{
|
|
/* update link after link is reseted */
|
|
if (link && !need_reset)
|
|
netif_carrier_on(dev->net);
|
|
else
|
|
netif_carrier_off(dev->net);
|
|
|
|
if (need_reset && link)
|
|
usbnet_defer_kevent(dev, EVENT_LINK_RESET);
|
|
else
|
|
usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
|
|
}
|
|
EXPORT_SYMBOL(usbnet_link_change);
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
|
|
u16 value, u16 index, void *data, u16 size)
|
|
{
|
|
void *buf = NULL;
|
|
int err = -ENOMEM;
|
|
|
|
netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
|
|
" value=0x%04x index=0x%04x size=%d\n",
|
|
cmd, reqtype, value, index, size);
|
|
|
|
if (size) {
|
|
buf = kmalloc(size, GFP_NOIO);
|
|
if (!buf)
|
|
goto out;
|
|
}
|
|
|
|
err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
|
|
cmd, reqtype, value, index, buf, size,
|
|
USB_CTRL_GET_TIMEOUT);
|
|
if (err > 0 && err <= size) {
|
|
if (data)
|
|
memcpy(data, buf, err);
|
|
else
|
|
netdev_dbg(dev->net,
|
|
"Huh? Data requested but thrown away.\n");
|
|
}
|
|
kfree(buf);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
|
|
u16 value, u16 index, const void *data,
|
|
u16 size)
|
|
{
|
|
void *buf = NULL;
|
|
int err = -ENOMEM;
|
|
|
|
netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
|
|
" value=0x%04x index=0x%04x size=%d\n",
|
|
cmd, reqtype, value, index, size);
|
|
|
|
if (data) {
|
|
buf = kmemdup(data, size, GFP_NOIO);
|
|
if (!buf)
|
|
goto out;
|
|
} else {
|
|
if (size) {
|
|
WARN_ON_ONCE(1);
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
|
|
cmd, reqtype, value, index, buf, size,
|
|
USB_CTRL_SET_TIMEOUT);
|
|
kfree(buf);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* The function can't be called inside suspend/resume callback,
|
|
* otherwise deadlock will be caused.
|
|
*/
|
|
int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
|
|
u16 value, u16 index, void *data, u16 size)
|
|
{
|
|
int ret;
|
|
|
|
if (usb_autopm_get_interface(dev->intf) < 0)
|
|
return -ENODEV;
|
|
ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
|
|
data, size);
|
|
usb_autopm_put_interface(dev->intf);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_read_cmd);
|
|
|
|
/*
|
|
* The function can't be called inside suspend/resume callback,
|
|
* otherwise deadlock will be caused.
|
|
*/
|
|
int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
|
|
u16 value, u16 index, const void *data, u16 size)
|
|
{
|
|
int ret;
|
|
|
|
if (usb_autopm_get_interface(dev->intf) < 0)
|
|
return -ENODEV;
|
|
ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
|
|
data, size);
|
|
usb_autopm_put_interface(dev->intf);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_write_cmd);
|
|
|
|
/*
|
|
* The function can be called inside suspend/resume callback safely
|
|
* and should only be called by suspend/resume callback generally.
|
|
*/
|
|
int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
|
|
u16 value, u16 index, void *data, u16 size)
|
|
{
|
|
return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
|
|
data, size);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
|
|
|
|
/*
|
|
* The function can be called inside suspend/resume callback safely
|
|
* and should only be called by suspend/resume callback generally.
|
|
*/
|
|
int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
|
|
u16 value, u16 index, const void *data,
|
|
u16 size)
|
|
{
|
|
return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
|
|
data, size);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
|
|
|
|
static void usbnet_async_cmd_cb(struct urb *urb)
|
|
{
|
|
struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
|
|
int status = urb->status;
|
|
|
|
if (status < 0)
|
|
dev_dbg(&urb->dev->dev, "%s failed with %d",
|
|
__func__, status);
|
|
|
|
kfree(req);
|
|
usb_free_urb(urb);
|
|
}
|
|
|
|
/*
|
|
* The caller must make sure that device can't be put into suspend
|
|
* state until the control URB completes.
|
|
*/
|
|
int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
|
|
u16 value, u16 index, const void *data, u16 size)
|
|
{
|
|
struct usb_ctrlrequest *req;
|
|
struct urb *urb;
|
|
int err = -ENOMEM;
|
|
void *buf = NULL;
|
|
|
|
netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
|
|
" value=0x%04x index=0x%04x size=%d\n",
|
|
cmd, reqtype, value, index, size);
|
|
|
|
urb = usb_alloc_urb(0, GFP_ATOMIC);
|
|
if (!urb)
|
|
goto fail;
|
|
|
|
if (data) {
|
|
buf = kmemdup(data, size, GFP_ATOMIC);
|
|
if (!buf) {
|
|
netdev_err(dev->net, "Error allocating buffer"
|
|
" in %s!\n", __func__);
|
|
goto fail_free_urb;
|
|
}
|
|
}
|
|
|
|
req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
|
|
if (!req)
|
|
goto fail_free_buf;
|
|
|
|
req->bRequestType = reqtype;
|
|
req->bRequest = cmd;
|
|
req->wValue = cpu_to_le16(value);
|
|
req->wIndex = cpu_to_le16(index);
|
|
req->wLength = cpu_to_le16(size);
|
|
|
|
usb_fill_control_urb(urb, dev->udev,
|
|
usb_sndctrlpipe(dev->udev, 0),
|
|
(void *)req, buf, size,
|
|
usbnet_async_cmd_cb, req);
|
|
urb->transfer_flags |= URB_FREE_BUFFER;
|
|
|
|
err = usb_submit_urb(urb, GFP_ATOMIC);
|
|
if (err < 0) {
|
|
netdev_err(dev->net, "Error submitting the control"
|
|
" message: status=%d\n", err);
|
|
goto fail_free_all;
|
|
}
|
|
return 0;
|
|
|
|
fail_free_all:
|
|
kfree(req);
|
|
fail_free_buf:
|
|
kfree(buf);
|
|
/*
|
|
* avoid a double free
|
|
* needed because the flag can be set only
|
|
* after filling the URB
|
|
*/
|
|
urb->transfer_flags = 0;
|
|
fail_free_urb:
|
|
usb_free_urb(urb);
|
|
fail:
|
|
return err;
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static int __init usbnet_init(void)
|
|
{
|
|
/* Compiler should optimize this out. */
|
|
BUILD_BUG_ON(
|
|
sizeof_field(struct sk_buff, cb) < sizeof(struct skb_data));
|
|
|
|
eth_random_addr(node_id);
|
|
return 0;
|
|
}
|
|
module_init(usbnet_init);
|
|
|
|
static void __exit usbnet_exit(void)
|
|
{
|
|
}
|
|
module_exit(usbnet_exit);
|
|
|
|
MODULE_AUTHOR("David Brownell");
|
|
MODULE_DESCRIPTION("USB network driver framework");
|
|
MODULE_LICENSE("GPL");
|