/*
* WUSB Wire Adapter: WLP interface
* Driver for the Linux Network stack.
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* 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 Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* FIXME: docs
*
* Implementation of the netdevice linkage (except tx and rx related stuff).
*
* ROADMAP:
*
* ENTRY POINTS (Net device):
*
* i1480u_open(): Called when we ifconfig up the interface;
* associates to a UWB host controller, reserves
* bandwidth (MAS), sets up RX USB URB and starts
* the queue.
*
* i1480u_stop(): Called when we ifconfig down a interface;
* reverses _open().
*
* i1480u_set_config():
*/
#include <linux/slab.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include "i1480u-wlp.h"
struct i1480u_cmd_set_ip_mas {
struct uwb_rccb rccb;
struct uwb_dev_addr addr;
u8 stream;
u8 owner;
u8 type; /* enum uwb_drp_type */
u8 baMAS[32];
} __attribute__((packed));
static
int i1480u_set_ip_mas(
struct uwb_rc *rc,
const struct uwb_dev_addr *dstaddr,
u8 stream, u8 owner, u8 type, unsigned long *mas)
{
int result;
struct i1480u_cmd_set_ip_mas *cmd;
struct uwb_rc_evt_confirm reply;
result = -ENOMEM;
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
if (cmd == NULL)
goto error_kzalloc;
cmd->rccb.bCommandType = 0xfd;
cmd->rccb.wCommand = cpu_to_le16(0x000e);
cmd->addr = *dstaddr;
cmd->stream = stream;
cmd->owner = owner;
cmd->type = type;
if (mas == NULL)
memset(cmd->baMAS, 0x00, sizeof(cmd->baMAS));
else
memcpy(cmd->baMAS, mas, sizeof(cmd->baMAS));
reply.rceb.bEventType = 0xfd;
reply.rceb.wEvent = cpu_to_le16(0x000e);
result = uwb_rc_cmd(rc, "SET-IP-MAS", &cmd->rccb, sizeof(*cmd),
&reply.rceb, sizeof(reply));
if (result < 0)
goto error_cmd;
if (reply.bResultCode != UWB_RC_RES_FAIL) {
dev_err(&rc->uwb_dev.dev,
"SET-IP-MAS: command execution failed: %d\n",
reply.bResultCode);
result = -EIO;
}
error_cmd:
kfree(cmd);
error_kzalloc:
return result;
}
/*
* Inform a WLP interface of a MAS reservation
*
* @rc is assumed refcnted.
*/
/* FIXME: detect if remote device is WLP capable? */
static int i1480u_mas_set_dev(struct uwb_dev *uwb_dev, struct uwb_rc *rc,
u8 stream, u8 owner, u8 type, unsigned long *mas)
{
int result = 0;
struct device *dev = &rc->uwb_dev.dev;
result = i1480u_set_ip_mas(rc, &uwb_dev->dev_addr, stream, owner,
type, mas);
if (result < 0) {
char rcaddrbuf[UWB_ADDR_STRSIZE], devaddrbuf[UWB_ADDR_STRSIZE];
uwb_dev_addr_print(rcaddrbuf, sizeof(rcaddrbuf),
&rc->uwb_dev.dev_addr);
uwb_dev_addr_print(devaddrbuf, sizeof(devaddrbuf),
&uwb_dev->dev_addr);
dev_err(dev, "Set IP MAS (%s to %s) failed: %d\n",
rcaddrbuf, devaddrbuf, result);
}
return result;
}
/**
* Called by bandwidth allocator when change occurs in reservation.
*
* @rsv: The reservation that is being established, modified, or
* terminated.
*
* When a reservation is established, modified, or terminated the upper layer
* (WLP here) needs set/update the currently available Media Access Slots
* that can be use for IP traffic.
*
* Our action taken during failure depends on how the reservation is being
* changed:
* - if reservation is being established we do nothing if we cannot set the
* new MAS to be used
* - if reservation is being terminated we revert back to PCA whether the
* SET IP MAS command succeeds or not.
*/
void i1480u_bw_alloc_cb(struct uwb_rsv *rsv)
{
int result = 0;
struct i1480u *i1480u = rsv->pal_priv;
struct device *dev = &i1480u->usb_iface->dev;
struct uwb_dev *target_dev = rsv->target.dev;
struct uwb_rc *rc = i1480u->wlp.rc;
u8 stream = rsv->stream;
int type = rsv->type;
int is_owner = rsv->owner == &rc->uwb_dev;
unsigned long *bmp = rsv->mas.bm;
dev_err(dev, "WLP callback called - sending set ip mas\n");
/*user cannot change options while setting configuration*/
mutex_lock(&i1480u->options.mutex);
switch (rsv->state) {
case UWB_RSV_STATE_T_ACCEPTED:
case UWB_RSV_STATE_O_ESTABLISHED:
result = i1480u_mas_set_dev(target_dev, rc, stream, is_owner,
type, bmp);
if (result < 0) {
dev_err(dev, "MAS reservation failed: %d\n", result);
goto out;
}
if (is_owner) {
wlp_tx_hdr_set_delivery_id_type(&i1480u->options.def_tx_hdr,
WLP_DRP | stream);
wlp_tx_hdr_set_rts_cts(&i1480u->options.def_tx_hdr, 0);
}
break;
case UWB_RSV_STATE_NONE:
/* revert back to PCA */
result = i1480u_mas_set_dev(target_dev, rc, stream, is_owner,
type, bmp);
if (result < 0)
dev_err(dev, "MAS reservation failed: %d\n", result);
/* Revert to PCA even though SET IP MAS failed. */
wlp_tx_hdr_set_delivery_id_type(&i1480u->options.def_tx_hdr,
i1480u->options.pca_base_priority);
wlp_tx_hdr_set_rts_cts(&i1480u->options.def_tx_hdr, 1);
break;
default:
dev_err(dev, "unexpected WLP reservation state: %s (%d).\n",
uwb_rsv_state_str(rsv->state), rsv->state);
break;
}
out:
mutex_unlock(&i1480u->options.mutex);
return;
}
/**
*
* Called on 'ifconfig up'
*/
int i1480u_open(struct net_device *net_dev)
{
int result;
struct i1480u *i1480u = netdev_priv(net_dev);
struct wlp *wlp = &i1480u->wlp;
struct uwb_rc *rc;
struct device *dev = &i1480u->usb_iface->dev;
rc = wlp->rc;
result = i1480u_rx_setup(i1480u); /* Alloc RX stuff */
if (result < 0)
goto error_rx_setup;
result = uwb_radio_start(&wlp->pal);
if (result < 0)
goto error_radio_start;
netif_wake_queue(net_dev);
#ifdef i1480u_FLOW_CONTROL
result = usb_submit_urb(i1480u->notif_urb, GFP_KERNEL);
if (result < 0) {
dev_err(dev, "Can't submit notification URB: %d\n", result);
goto error_notif_urb_submit;
}
#endif
/* Interface is up with an address, now we can create WSS */
result = wlp_wss_setup(net_dev, &wlp->wss);
if (result < 0) {
dev_err(dev, "Can't create WSS: %d. \n", result);
goto error_wss_setup;
}
return 0;
error_wss_setup:
#ifdef i1480u_FLOW_CONTROL
usb_kill_urb(i1480u->notif_urb);
error_notif_urb_submit:
#endif
uwb_radio_stop(&wlp->pal);
error_radio_start:
netif_stop_queue(net_dev);
i1480u_rx_release(i1480u);
error_rx_setup:
return result;
}
/**
* Called on 'ifconfig down'
*/
int i1480u_stop(struct net_device *net_dev)
{
struct i1480u *i1480u = netdev_priv(net_dev);
struct wlp *wlp = &i1480u->wlp;
BUG_ON(wlp->rc == NULL);
wlp_wss_remove(&wlp->wss);
netif_carrier_off(net_dev);
#ifdef i1480u_FLOW_CONTROL
usb_kill_urb(i1480u->notif_urb);
#endif
netif_stop_queue(net_dev);
uwb_radio_stop(&wlp->pal);
i1480u_rx_release(i1480u);
i1480u_tx_release(i1480u);
return 0;
}
/**
*
* Change the interface config--we probably don't have to do anything.
*/
int i1480u_set_config(struct net_device *net_dev, struct ifmap *map)
{
int result;
struct i1480u *i1480u = netdev_priv(net_dev);
BUG_ON(i1480u->wlp.rc == NULL);
result = 0;
return result;
}
/**
* Change the MTU of the interface
*/
int i1480u_change_mtu(struct net_device *net_dev, int mtu)
{
static union {
struct wlp_tx_hdr tx;
struct wlp_rx_hdr rx;
} i1480u_all_hdrs;
if (mtu < ETH_HLEN) /* We encap eth frames */
return -ERANGE;
if (mtu > 4000 - sizeof(i1480u_all_hdrs))
return -ERANGE;
net_dev->mtu = mtu;
return 0;
}
/**
* Stop the network queue
*
* Enable WLP substack to stop network queue. We also set the flow control
* threshold at this time to prevent the flow control from restarting the
* queue.
*
* we are loosing the current threshold value here ... FIXME?
*/
void i1480u_stop_queue(struct wlp *wlp)
{
struct i1480u *i1480u = container_of(wlp, struct i1480u, wlp);
struct net_device *net_dev = i1480u->net_dev;
i1480u->tx_inflight.threshold = 0;
netif_stop_queue(net_dev);
}
/**
* Start the network queue
*
* Enable WLP substack to start network queue. Also re-enable the flow
* control to manage the queue again.
*
* We re-enable the flow control by storing the default threshold in the
* flow control threshold. This means that if the user modified the
* threshold before the queue was stopped and restarted that information
* will be lost. FIXME?
*/
void i1480u_start_queue(struct wlp *wlp)
{
struct i1480u *i1480u = container_of(wlp, struct i1480u, wlp);
struct net_device *net_dev = i1480u->net_dev;
i1480u->tx_inflight.threshold = i1480u_TX_INFLIGHT_THRESHOLD;
netif_start_queue(net_dev);
}
