| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * USB Network driver infrastructure |
| * Copyright (C) 2000-2005 by David Brownell |
| * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com> |
| */ |
| |
| /* |
| * This is a generic "USB networking" framework that works with several |
| * kinds of full and high speed networking devices: host-to-host cables, |
| * smart usb peripherals, and actual Ethernet adapters. |
| * |
| * These devices usually differ in terms of control protocols (if they |
| * even have one!) and sometimes they define new framing to wrap or batch |
| * Ethernet packets. Otherwise, they talk to USB pretty much the same, |
| * so interface (un)binding, endpoint I/O queues, fault handling, and other |
| * issues can usefully be addressed by this framework. |
| */ |
| |
| // #define DEBUG // error path messages, extra info |
| // #define VERBOSE // more; success messages |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/netdevice.h> |
| #include <linux/etherdevice.h> |
| #include <linux/ctype.h> |
| #include <linux/ethtool.h> |
| #include <linux/workqueue.h> |
| #include <linux/mii.h> |
| #include <linux/usb.h> |
| #include <linux/usb/usbnet.h> |
| #include <linux/slab.h> |
| #include <linux/kernel.h> |
| #include <linux/pm_runtime.h> |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* |
| * 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). |
| * |
| * 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 MAX_QUEUE_MEMORY (60 * 1518) |
| #define RX_QLEN(dev) ((dev)->rx_qlen) |
| #define TX_QLEN(dev) ((dev)->tx_qlen) |
| |
| // reawaken network queue this soon after stopping; else watchdog barks |
| #define TX_TIMEOUT_JIFFIES (5*HZ) |
| |
| /* throttle rx/tx briefly after some faults, so hub_wq 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]; |
| |
| /* 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 const char * const usbnet_event_names[] = { |
| [EVENT_TX_HALT] = "EVENT_TX_HALT", |
| [EVENT_RX_HALT] = "EVENT_RX_HALT", |
| [EVENT_RX_MEMORY] = "EVENT_RX_MEMORY", |
| [EVENT_STS_SPLIT] = "EVENT_STS_SPLIT", |
| [EVENT_LINK_RESET] = "EVENT_LINK_RESET", |
| [EVENT_RX_PAUSED] = "EVENT_RX_PAUSED", |
| [EVENT_DEV_ASLEEP] = "EVENT_DEV_ASLEEP", |
| [EVENT_DEV_OPEN] = "EVENT_DEV_OPEN", |
| [EVENT_DEVICE_REPORT_IDLE] = "EVENT_DEVICE_REPORT_IDLE", |
| [EVENT_NO_RUNTIME_PM] = "EVENT_NO_RUNTIME_PM", |
| [EVENT_RX_KILL] = "EVENT_RX_KILL", |
| [EVENT_LINK_CHANGE] = "EVENT_LINK_CHANGE", |
| [EVENT_SET_RX_MODE] = "EVENT_SET_RX_MODE", |
| [EVENT_NO_IP_ALIGN] = "EVENT_NO_IP_ALIGN", |
| }; |
| |
| /* handles CDC Ethernet and many other network "bulk data" interfaces */ |
| int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) |
| { |
| int tmp; |
| struct usb_host_interface *alt = NULL; |
| struct usb_host_endpoint *in = NULL, *out = NULL; |
| struct usb_host_endpoint *status = NULL; |
| |
| for (tmp = 0; tmp < intf->num_altsetting; tmp++) { |
| unsigned ep; |
| |
| in = out = status = NULL; |
| alt = intf->altsetting + tmp; |
| |
| /* take the first altsetting with in-bulk + out-bulk; |
| * remember any status endpoint, just in case; |
| * ignore other endpoints and altsettings. |
| */ |
| for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { |
| struct usb_host_endpoint *e; |
| int intr = 0; |
| |
| e = alt->endpoint + ep; |
| |
| /* ignore endpoints which cannot transfer data */ |
| if (!usb_endpoint_maxp(&e->desc)) |
| continue; |
| |
| switch (e->desc.bmAttributes) { |
| case USB_ENDPOINT_XFER_INT: |
| if (!usb_endpoint_dir_in(&e->desc)) |
| continue; |
| intr = 1; |
| fallthrough; |
| case USB_ENDPOINT_XFER_BULK: |
| break; |
| default: |
| continue; |
| } |
| if (usb_endpoint_dir_in(&e->desc)) { |
| if (!intr && !in) |
| in = e; |
| else if (intr && !status) |
| status = e; |
| } else { |
| if (!out) |
| out = e; |
| } |
| } |
| if (in && out) |
| break; |
| } |
| if (!alt || !in || !out) |
| return -EINVAL; |
| |
| if (alt->desc.bAlternateSetting != 0 || |
| !(dev->driver_info->flags & FLAG_NO_SETINT)) { |
| tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, |
| alt->desc.bAlternateSetting); |
| if (tmp < 0) |
| return tmp; |
| } |
| |
| dev->in = usb_rcvbulkpipe (dev->udev, |
| in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); |
| dev->out = usb_sndbulkpipe (dev->udev, |
| out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); |
| dev->status = status; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(usbnet_get_endpoints); |
| |
| int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) |
| { |
| int tmp = -1, ret; |
| unsigned char buf [13]; |
| |
| ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf); |
| if (ret == 12) |
| tmp = hex2bin(dev->net->dev_addr, buf, 6); |
| if (tmp < 0) { |
| dev_dbg(&dev->udev->dev, |
| "bad MAC string %d fetch, %d\n", iMACAddress, tmp); |
| if (ret >= 0) |
| ret = -EINVAL; |
| return ret; |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); |
| |
| static void intr_complete (struct urb *urb) |
| { |
| struct usbnet *dev = urb->context; |
| int status = urb->status; |
| |
| switch (status) { |
| /* success */ |
| case 0: |
| dev->driver_info->status(dev, urb); |
| break; |
| |
| /* software-driven interface shutdown */ |
| case -ENOENT: /* urb killed */ |
| case -ESHUTDOWN: /* hardware gone */ |
| netif_dbg(dev, ifdown, dev->net, |
| "intr shutdown, code %d\n", status); |
| return; |
| |
| /* NOTE: not throttling like RX/TX, since this endpoint |
| * already polls infrequently |
| */ |
| default: |
| netdev_dbg(dev->net, "intr status %d\n", status); |
| break; |
| } |
| |
| status = usb_submit_urb (urb, GFP_ATOMIC); |
| if (status != 0) |
| netif_err(dev, timer, dev->net, |
| "intr resubmit --> %d\n", status); |
| } |
| |
| static int init_status (struct usbnet *dev, struct usb_interface *intf) |
| { |
| char *buf = NULL; |
| unsigned pipe = 0; |
| unsigned maxp; |
| unsigned period; |
| |
| if (!dev->driver_info->status) |
| return 0; |
| |
| pipe = usb_rcvintpipe (dev->udev, |
| dev->status->desc.bEndpointAddress |
| & USB_ENDPOINT_NUMBER_MASK); |
| maxp = usb_maxpacket (dev->udev, pipe, 0); |
| |
| /* avoid 1 msec chatter: min 8 msec poll rate */ |
| period = max ((int) dev->status->desc.bInterval, |
| (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); |
| |
| buf = kmalloc (maxp, GFP_KERNEL); |
| if (buf) { |
| dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); |
| if (!dev->interrupt) { |
| kfree (buf); |
| return -ENOMEM; |
| } else { |
| usb_fill_int_urb(dev->interrupt, dev->udev, pipe, |
| buf, maxp, intr_complete, dev, period); |
| dev->interrupt->transfer_flags |= URB_FREE_BUFFER; |
| dev_dbg(&intf->dev, |
| "status ep%din, %d bytes period %d\n", |
| usb_pipeendpoint(pipe), maxp, period); |
| } |
| } |
| return 0; |
| } |
| |
| /* Submit the interrupt URB if not previously submitted, increasing refcount */ |
| int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags) |
| { |
| int ret = 0; |
| |
| WARN_ON_ONCE(dev->interrupt == NULL); |
| if (dev->interrupt) { |
| mutex_lock(&dev->interrupt_mutex); |
| |
| if (++dev->interrupt_count == 1) |
| ret = usb_submit_urb(dev->interrupt, mem_flags); |
| |
| dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n", |
| dev->interrupt_count); |
| mutex_unlock(&dev->interrupt_mutex); |
| } |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(usbnet_status_start); |
| |
| /* For resume; submit interrupt URB if previously submitted */ |
| static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags) |
| { |
| int ret = 0; |
| |
| mutex_lock(&dev->interrupt_mutex); |
| if (dev->interrupt_count) { |
| ret = usb_submit_urb(dev->interrupt, mem_flags); |
| dev_dbg(&dev->udev->dev, |
| "submitted interrupt URB for resume\n"); |
| } |
| mutex_unlock(&dev->interrupt_mutex); |
| return ret; |
| } |
| |
| /* Kill the interrupt URB if all submitters want it killed */ |
| void usbnet_status_stop(struct usbnet *dev) |
| { |
| if (dev->interrupt) { |
| mutex_lock(&dev->interrupt_mutex); |
| WARN_ON(dev->interrupt_count == 0); |
| |
| if (dev->interrupt_count && --dev->interrupt_count == 0) |
| usb_kill_urb(dev->interrupt); |
| |
| dev_dbg(&dev->udev->dev, |
| "decremented interrupt URB count to %d\n", |
| dev->interrupt_count); |
| mutex_unlock(&dev->interrupt_mutex); |
| } |
| } |
| EXPORT_SYMBOL_GPL(usbnet_status_stop); |
| |
| /* For suspend; always kill interrupt URB */ |
| static void __usbnet_status_stop_force(struct usbnet *dev) |
| { |
| if (dev->interrupt) { |
| mutex_lock(&dev->interrupt_mutex); |
| usb_kill_urb(dev->interrupt); |
| dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n"); |
| mutex_unlock(&dev->interrupt_mutex); |
| } |
| } |
| |
| /* 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) |
| { |
| struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->net->tstats); |
| unsigned long flags; |
| int status; |
| |
| if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { |
| skb_queue_tail(&dev->rxq_pause, skb); |
| return; |
| } |
| |
| /* only update if unset to allow minidriver rx_fixup override */ |
| if (skb->protocol == 0) |
| skb->protocol = eth_type_trans (skb, dev->net); |
| |
| flags = u64_stats_update_begin_irqsave(&stats64->syncp); |
| stats64->rx_packets++; |
| stats64->rx_bytes += skb->len; |
| u64_stats_update_end_irqrestore(&stats64->syncp, flags); |
| |
| netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", |
| skb->len + sizeof (struct ethhdr), skb->protocol); |
| memset (skb->cb, 0, sizeof (struct skb_data)); |
| |
| if (skb_defer_rx_timestamp(skb)) |
| return; |
| |
| status = netif_rx (skb); |
| if (status != NET_RX_SUCCESS) |
| netif_dbg(dev, rx_err, dev->net, |
| "netif_rx status %d\n", status); |
| } |
| EXPORT_SYMBOL_GPL(usbnet_skb_return); |
| |
| /* must be called if hard_mtu or rx_urb_size changed */ |
| void usbnet_update_max_qlen(struct usbnet *dev) |
| { |
| enum usb_device_speed speed = dev->udev->speed; |
| |
| if (!dev->rx_urb_size || !dev->hard_mtu) |
| goto insanity; |
| switch (speed) { |
| case USB_SPEED_HIGH: |
| dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; |
| dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu; |
| break; |
| case USB_SPEED_SUPER: |
| case USB_SPEED_SUPER_PLUS: |
| /* |
| * Not take default 5ms qlen for super speed HC to |
| * save memory, and iperf tests show 2.5ms qlen can |
| * work well |
| */ |
| dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size; |
| dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; |
| break; |
| default: |
| insanity: |
| dev->rx_qlen = dev->tx_qlen = 4; |
| } |
| } |
| EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); |
| |
| |
| /*------------------------------------------------------------------------- |
| * |
| * Network Device Driver (peer link to "Host Device", from USB host) |
| * |
| *-------------------------------------------------------------------------*/ |
| |
| int usbnet_change_mtu (struct net_device *net, int new_mtu) |
| { |
| struct usbnet *dev = netdev_priv(net); |
| int ll_mtu = new_mtu + net->hard_header_len; |
| int old_hard_mtu = dev->hard_mtu; |
| int old_rx_urb_size = dev->rx_urb_size; |
| |
| // no second zero-length packet read wanted after mtu-sized packets |
| if ((ll_mtu % dev->maxpacket) == 0) |
| return -EDOM; |
| net->mtu = new_mtu; |
| |
| dev->hard_mtu = net->mtu + net->hard_header_len; |
| if (dev->rx_urb_size == old_hard_mtu) { |
| dev->rx_urb_size = dev->hard_mtu; |
| if (dev->rx_urb_size > old_rx_urb_size) { |
| usbnet_pause_rx(dev); |
| usbnet_unlink_rx_urbs(dev); |
| usbnet_resume_rx(dev); |
| } |
| } |
| |
| /* max qlen depend on hard_mtu and rx_urb_size */ |
| usbnet_update_max_qlen(dev); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(usbnet_change_mtu); |
| |
| /* The caller must hold list->lock */ |
| static void __usbnet_queue_skb(struct sk_buff_head *list, |
| struct sk_buff *newsk, enum skb_state state) |
| { |
| struct skb_data *entry = (struct skb_data *) newsk->cb; |
| |
| __skb_queue_tail(list, newsk); |
| entry->state = state; |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from |
| * completion callbacks. 2.5 should have fixed those bugs... |
| */ |
| |
| static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, |
| struct sk_buff_head *list, enum skb_state state) |
| { |
| unsigned long flags; |
| enum skb_state old_state; |
| struct skb_data *entry = (struct skb_data *) skb->cb; |
| |
| spin_lock_irqsave(&list->lock, flags); |
| old_state = entry->state; |
| entry->state = state; |
| __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 void rx_process (struct usbnet *dev, struct sk_buff *skb) |
| { |
| if (dev->driver_info->rx_fixup && |
| !dev->driver_info->rx_fixup (dev, skb)) { |
| /* With RX_ASSEMBLE, rx_fixup() must update counters */ |
| if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) |
| dev->net->stats.rx_errors++; |
| goto done; |
| } |
| // else network stack removes extra byte if we forced a short packet |
| |
| /* all data was already cloned from skb inside the driver */ |
| if (dev->driver_info->flags & FLAG_MULTI_PACKET) |
| goto done; |
| |
| 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); |
| } else { |
| usbnet_skb_return(dev, skb); |
| return; |
| } |
| |
| done: |
| skb_queue_tail(&dev->done, skb); |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static void rx_complete (struct urb *urb) |
| { |
| struct sk_buff *skb = (struct sk_buff *) urb->context; |
| struct skb_data *entry = (struct skb_data *) skb->cb; |
| struct usbnet *dev = entry->dev; |
| int urb_status = urb->status; |
| 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); |
| |
| strlcpy (info->driver, dev->driver_name, sizeof info->driver); |
| strlcpy (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); |
| stats64->tx_packets += entry->packets; |
| 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; |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| // 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: |
| entry->state = rx_cleanup; |
| rx_process (dev, skb); |
| continue; |
| case tx_done: |
| kfree(entry->urb->sg); |
| fallthrough; |
| case rx_cleanup: |
| usb_free_urb (entry->urb); |
| dev_kfree_skb (skb); |
| continue; |
| default: |
| netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); |
| } |
| } |
| |
| /* 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)); |
| 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; |
| 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, 1); |
| 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"); |