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linux-next/drivers/usb/gadget/f_phonet.c
Rémi Denis-Courmont f5a4532528 f_phonet: avoid pskb_pull(), fix OOPS with CONFIG_HIGHMEM
This is similar to what we already do in cdc-phonet.c in the same
situation. pskb_pull() refuses to work with HIGHMEM, even if it is
known that the socket buffer is entirely in "low" memory.

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-28 12:36:39 -08:00

640 lines
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/*
* f_phonet.c -- USB CDC Phonet function
*
* Copyright (C) 2007-2008 Nokia Corporation. All rights reserved.
*
* Author: Rémi Denis-Courmont
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/netdevice.h>
#include <linux/if_ether.h>
#include <linux/if_phonet.h>
#include <linux/if_arp.h>
#include <linux/usb/ch9.h>
#include <linux/usb/cdc.h>
#include <linux/usb/composite.h>
#include "u_phonet.h"
#define PN_MEDIA_USB 0x1B
#define MAXPACKET 512
#if (PAGE_SIZE % MAXPACKET)
#error MAXPACKET must divide PAGE_SIZE!
#endif
/*-------------------------------------------------------------------------*/
struct phonet_port {
struct f_phonet *usb;
spinlock_t lock;
};
struct f_phonet {
struct usb_function function;
struct {
struct sk_buff *skb;
spinlock_t lock;
} rx;
struct net_device *dev;
struct usb_ep *in_ep, *out_ep;
struct usb_request *in_req;
struct usb_request *out_reqv[0];
};
static int phonet_rxq_size = 17;
static inline struct f_phonet *func_to_pn(struct usb_function *f)
{
return container_of(f, struct f_phonet, function);
}
/*-------------------------------------------------------------------------*/
#define USB_CDC_SUBCLASS_PHONET 0xfe
#define USB_CDC_PHONET_TYPE 0xab
static struct usb_interface_descriptor
pn_control_intf_desc = {
.bLength = sizeof pn_control_intf_desc,
.bDescriptorType = USB_DT_INTERFACE,
/* .bInterfaceNumber = DYNAMIC, */
.bInterfaceClass = USB_CLASS_COMM,
.bInterfaceSubClass = USB_CDC_SUBCLASS_PHONET,
};
static const struct usb_cdc_header_desc
pn_header_desc = {
.bLength = sizeof pn_header_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_HEADER_TYPE,
.bcdCDC = cpu_to_le16(0x0110),
};
static const struct usb_cdc_header_desc
pn_phonet_desc = {
.bLength = sizeof pn_phonet_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_PHONET_TYPE,
.bcdCDC = cpu_to_le16(0x1505), /* ??? */
};
static struct usb_cdc_union_desc
pn_union_desc = {
.bLength = sizeof pn_union_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_UNION_TYPE,
/* .bMasterInterface0 = DYNAMIC, */
/* .bSlaveInterface0 = DYNAMIC, */
};
static struct usb_interface_descriptor
pn_data_nop_intf_desc = {
.bLength = sizeof pn_data_nop_intf_desc,
.bDescriptorType = USB_DT_INTERFACE,
/* .bInterfaceNumber = DYNAMIC, */
.bAlternateSetting = 0,
.bNumEndpoints = 0,
.bInterfaceClass = USB_CLASS_CDC_DATA,
};
static struct usb_interface_descriptor
pn_data_intf_desc = {
.bLength = sizeof pn_data_intf_desc,
.bDescriptorType = USB_DT_INTERFACE,
/* .bInterfaceNumber = DYNAMIC, */
.bAlternateSetting = 1,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_CDC_DATA,
};
static struct usb_endpoint_descriptor
pn_fs_sink_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_endpoint_descriptor
pn_hs_sink_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(MAXPACKET),
};
static struct usb_endpoint_descriptor
pn_fs_source_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_endpoint_descriptor
pn_hs_source_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
};
static struct usb_descriptor_header *fs_pn_function[] = {
(struct usb_descriptor_header *) &pn_control_intf_desc,
(struct usb_descriptor_header *) &pn_header_desc,
(struct usb_descriptor_header *) &pn_phonet_desc,
(struct usb_descriptor_header *) &pn_union_desc,
(struct usb_descriptor_header *) &pn_data_nop_intf_desc,
(struct usb_descriptor_header *) &pn_data_intf_desc,
(struct usb_descriptor_header *) &pn_fs_sink_desc,
(struct usb_descriptor_header *) &pn_fs_source_desc,
NULL,
};
static struct usb_descriptor_header *hs_pn_function[] = {
(struct usb_descriptor_header *) &pn_control_intf_desc,
(struct usb_descriptor_header *) &pn_header_desc,
(struct usb_descriptor_header *) &pn_phonet_desc,
(struct usb_descriptor_header *) &pn_union_desc,
(struct usb_descriptor_header *) &pn_data_nop_intf_desc,
(struct usb_descriptor_header *) &pn_data_intf_desc,
(struct usb_descriptor_header *) &pn_hs_sink_desc,
(struct usb_descriptor_header *) &pn_hs_source_desc,
NULL,
};
/*-------------------------------------------------------------------------*/
static int pn_net_open(struct net_device *dev)
{
netif_wake_queue(dev);
return 0;
}
static int pn_net_close(struct net_device *dev)
{
netif_stop_queue(dev);
return 0;
}
static void pn_tx_complete(struct usb_ep *ep, struct usb_request *req)
{
struct f_phonet *fp = ep->driver_data;
struct net_device *dev = fp->dev;
struct sk_buff *skb = req->context;
switch (req->status) {
case 0:
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
break;
case -ESHUTDOWN: /* disconnected */
case -ECONNRESET: /* disabled */
dev->stats.tx_aborted_errors++;
default:
dev->stats.tx_errors++;
}
dev_kfree_skb_any(skb);
netif_wake_queue(dev);
}
static int pn_net_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct phonet_port *port = netdev_priv(dev);
struct f_phonet *fp;
struct usb_request *req;
unsigned long flags;
if (skb->protocol != htons(ETH_P_PHONET))
goto out;
spin_lock_irqsave(&port->lock, flags);
fp = port->usb;
if (unlikely(!fp)) /* race with carrier loss */
goto out_unlock;
req = fp->in_req;
req->buf = skb->data;
req->length = skb->len;
req->complete = pn_tx_complete;
req->zero = 1;
req->context = skb;
if (unlikely(usb_ep_queue(fp->in_ep, req, GFP_ATOMIC)))
goto out_unlock;
netif_stop_queue(dev);
skb = NULL;
out_unlock:
spin_unlock_irqrestore(&port->lock, flags);
out:
if (unlikely(skb)) {
dev_kfree_skb(skb);
dev->stats.tx_dropped++;
}
return NETDEV_TX_OK;
}
static int pn_net_mtu(struct net_device *dev, int new_mtu)
{
if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU))
return -EINVAL;
dev->mtu = new_mtu;
return 0;
}
static const struct net_device_ops pn_netdev_ops = {
.ndo_open = pn_net_open,
.ndo_stop = pn_net_close,
.ndo_start_xmit = pn_net_xmit,
.ndo_change_mtu = pn_net_mtu,
};
static void pn_net_setup(struct net_device *dev)
{
dev->features = 0;
dev->type = ARPHRD_PHONET;
dev->flags = IFF_POINTOPOINT | IFF_NOARP;
dev->mtu = PHONET_DEV_MTU;
dev->hard_header_len = 1;
dev->dev_addr[0] = PN_MEDIA_USB;
dev->addr_len = 1;
dev->tx_queue_len = 1;
dev->netdev_ops = &pn_netdev_ops;
dev->destructor = free_netdev;
dev->header_ops = &phonet_header_ops;
}
/*-------------------------------------------------------------------------*/
/*
* Queue buffer for data from the host
*/
static int
pn_rx_submit(struct f_phonet *fp, struct usb_request *req, gfp_t gfp_flags)
{
struct net_device *dev = fp->dev;
struct page *page;
int err;
page = __netdev_alloc_page(dev, gfp_flags);
if (!page)
return -ENOMEM;
req->buf = page_address(page);
req->length = PAGE_SIZE;
req->context = page;
err = usb_ep_queue(fp->out_ep, req, gfp_flags);
if (unlikely(err))
netdev_free_page(dev, page);
return err;
}
static void pn_rx_complete(struct usb_ep *ep, struct usb_request *req)
{
struct f_phonet *fp = ep->driver_data;
struct net_device *dev = fp->dev;
struct page *page = req->context;
struct sk_buff *skb;
unsigned long flags;
int status = req->status;
switch (status) {
case 0:
spin_lock_irqsave(&fp->rx.lock, flags);
skb = fp->rx.skb;
if (!skb)
skb = fp->rx.skb = netdev_alloc_skb(dev, 12);
if (req->actual < req->length) /* Last fragment */
fp->rx.skb = NULL;
spin_unlock_irqrestore(&fp->rx.lock, flags);
if (unlikely(!skb))
break;
if (skb->len == 0) { /* First fragment */
skb->protocol = htons(ETH_P_PHONET);
skb_reset_mac_header(skb);
/* Can't use pskb_pull() on page in IRQ */
memcpy(skb_put(skb, 1), page_address(page), 1);
}
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
skb->len == 0, req->actual);
page = NULL;
if (req->actual < req->length) { /* Last fragment */
skb->dev = dev;
dev->stats.rx_packets++;
dev->stats.rx_bytes += skb->len;
netif_rx(skb);
}
break;
/* Do not resubmit in these cases: */
case -ESHUTDOWN: /* disconnect */
case -ECONNABORTED: /* hw reset */
case -ECONNRESET: /* dequeued (unlink or netif down) */
req = NULL;
break;
/* Do resubmit in these cases: */
case -EOVERFLOW: /* request buffer overflow */
dev->stats.rx_over_errors++;
default:
dev->stats.rx_errors++;
break;
}
if (page)
netdev_free_page(dev, page);
if (req)
pn_rx_submit(fp, req, GFP_ATOMIC);
}
/*-------------------------------------------------------------------------*/
static void __pn_reset(struct usb_function *f)
{
struct f_phonet *fp = func_to_pn(f);
struct net_device *dev = fp->dev;
struct phonet_port *port = netdev_priv(dev);
netif_carrier_off(dev);
port->usb = NULL;
usb_ep_disable(fp->out_ep);
usb_ep_disable(fp->in_ep);
if (fp->rx.skb) {
dev_kfree_skb_irq(fp->rx.skb);
fp->rx.skb = NULL;
}
}
static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
{
struct f_phonet *fp = func_to_pn(f);
struct usb_gadget *gadget = fp->function.config->cdev->gadget;
if (intf == pn_control_intf_desc.bInterfaceNumber)
/* control interface, no altsetting */
return (alt > 0) ? -EINVAL : 0;
if (intf == pn_data_intf_desc.bInterfaceNumber) {
struct net_device *dev = fp->dev;
struct phonet_port *port = netdev_priv(dev);
/* data intf (0: inactive, 1: active) */
if (alt > 1)
return -EINVAL;
spin_lock(&port->lock);
__pn_reset(f);
if (alt == 1) {
struct usb_endpoint_descriptor *out, *in;
int i;
out = ep_choose(gadget,
&pn_hs_sink_desc,
&pn_fs_sink_desc);
in = ep_choose(gadget,
&pn_hs_source_desc,
&pn_fs_source_desc);
usb_ep_enable(fp->out_ep, out);
usb_ep_enable(fp->in_ep, in);
port->usb = fp;
fp->out_ep->driver_data = fp;
fp->in_ep->driver_data = fp;
netif_carrier_on(dev);
for (i = 0; i < phonet_rxq_size; i++)
pn_rx_submit(fp, fp->out_reqv[i], GFP_ATOMIC);
}
spin_unlock(&port->lock);
return 0;
}
return -EINVAL;
}
static int pn_get_alt(struct usb_function *f, unsigned intf)
{
struct f_phonet *fp = func_to_pn(f);
if (intf == pn_control_intf_desc.bInterfaceNumber)
return 0;
if (intf == pn_data_intf_desc.bInterfaceNumber) {
struct phonet_port *port = netdev_priv(fp->dev);
u8 alt;
spin_lock(&port->lock);
alt = port->usb != NULL;
spin_unlock(&port->lock);
return alt;
}
return -EINVAL;
}
static void pn_disconnect(struct usb_function *f)
{
struct f_phonet *fp = func_to_pn(f);
struct phonet_port *port = netdev_priv(fp->dev);
unsigned long flags;
/* remain disabled until set_alt */
spin_lock_irqsave(&port->lock, flags);
__pn_reset(f);
spin_unlock_irqrestore(&port->lock, flags);
}
/*-------------------------------------------------------------------------*/
static __init
int pn_bind(struct usb_configuration *c, struct usb_function *f)
{
struct usb_composite_dev *cdev = c->cdev;
struct usb_gadget *gadget = cdev->gadget;
struct f_phonet *fp = func_to_pn(f);
struct usb_ep *ep;
int status, i;
/* Reserve interface IDs */
status = usb_interface_id(c, f);
if (status < 0)
goto err;
pn_control_intf_desc.bInterfaceNumber = status;
pn_union_desc.bMasterInterface0 = status;
status = usb_interface_id(c, f);
if (status < 0)
goto err;
pn_data_nop_intf_desc.bInterfaceNumber = status;
pn_data_intf_desc.bInterfaceNumber = status;
pn_union_desc.bSlaveInterface0 = status;
/* Reserve endpoints */
status = -ENODEV;
ep = usb_ep_autoconfig(gadget, &pn_fs_sink_desc);
if (!ep)
goto err;
fp->out_ep = ep;
ep->driver_data = fp; /* Claim */
ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc);
if (!ep)
goto err;
fp->in_ep = ep;
ep->driver_data = fp; /* Claim */
pn_hs_sink_desc.bEndpointAddress =
pn_fs_sink_desc.bEndpointAddress;
pn_hs_source_desc.bEndpointAddress =
pn_fs_source_desc.bEndpointAddress;
/* Do not try to bind Phonet twice... */
fp->function.descriptors = fs_pn_function;
fp->function.hs_descriptors = hs_pn_function;
/* Incoming USB requests */
status = -ENOMEM;
for (i = 0; i < phonet_rxq_size; i++) {
struct usb_request *req;
req = usb_ep_alloc_request(fp->out_ep, GFP_KERNEL);
if (!req)
goto err;
req->complete = pn_rx_complete;
fp->out_reqv[i] = req;
}
/* Outgoing USB requests */
fp->in_req = usb_ep_alloc_request(fp->in_ep, GFP_KERNEL);
if (!fp->in_req)
goto err;
INFO(cdev, "USB CDC Phonet function\n");
INFO(cdev, "using %s, OUT %s, IN %s\n", cdev->gadget->name,
fp->out_ep->name, fp->in_ep->name);
return 0;
err:
if (fp->out_ep)
fp->out_ep->driver_data = NULL;
if (fp->in_ep)
fp->in_ep->driver_data = NULL;
ERROR(cdev, "USB CDC Phonet: cannot autoconfigure\n");
return status;
}
static void
pn_unbind(struct usb_configuration *c, struct usb_function *f)
{
struct f_phonet *fp = func_to_pn(f);
int i;
/* We are already disconnected */
if (fp->in_req)
usb_ep_free_request(fp->in_ep, fp->in_req);
for (i = 0; i < phonet_rxq_size; i++)
if (fp->out_reqv[i])
usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
kfree(fp);
}
/*-------------------------------------------------------------------------*/
static struct net_device *dev;
int __init phonet_bind_config(struct usb_configuration *c)
{
struct f_phonet *fp;
int err, size;
size = sizeof(*fp) + (phonet_rxq_size * sizeof(struct usb_request *));
fp = kzalloc(size, GFP_KERNEL);
if (!fp)
return -ENOMEM;
fp->dev = dev;
fp->function.name = "phonet";
fp->function.bind = pn_bind;
fp->function.unbind = pn_unbind;
fp->function.set_alt = pn_set_alt;
fp->function.get_alt = pn_get_alt;
fp->function.disable = pn_disconnect;
spin_lock_init(&fp->rx.lock);
err = usb_add_function(c, &fp->function);
if (err)
kfree(fp);
return err;
}
int __init gphonet_setup(struct usb_gadget *gadget)
{
struct phonet_port *port;
int err;
/* Create net device */
BUG_ON(dev);
dev = alloc_netdev(sizeof(*port), "upnlink%d", pn_net_setup);
if (!dev)
return -ENOMEM;
port = netdev_priv(dev);
spin_lock_init(&port->lock);
netif_carrier_off(dev);
SET_NETDEV_DEV(dev, &gadget->dev);
err = register_netdev(dev);
if (err)
free_netdev(dev);
return err;
}
void gphonet_cleanup(void)
{
unregister_netdev(dev);
}