diff options
Diffstat (limited to 'drivers/uwb/i1480/i1480u-wlp/netdev.c')
| -rw-r--r-- | drivers/uwb/i1480/i1480u-wlp/netdev.c | 368 |
1 files changed, 368 insertions, 0 deletions
diff --git a/drivers/uwb/i1480/i1480u-wlp/netdev.c b/drivers/uwb/i1480/i1480u-wlp/netdev.c new file mode 100644 index 000000000000..8802ac43d872 --- /dev/null +++ b/drivers/uwb/i1480/i1480u-wlp/netdev.c @@ -0,0 +1,368 @@ +/* + * 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/if_arp.h> +#include <linux/etherdevice.h> +#include <linux/uwb/debug.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; + 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 + i1480u->uwb_notifs_handler.cb = i1480u_uwb_notifs_cb; + i1480u->uwb_notifs_handler.data = i1480u; + if (uwb_bg_joined(rc)) + netif_carrier_on(net_dev); + else + netif_carrier_off(net_dev); + uwb_notifs_register(rc, &i1480u->uwb_notifs_handler); + /* 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_notif_deregister; + } + return 0; +error_notif_deregister: + uwb_notifs_deregister(rc, &i1480u->uwb_notifs_handler); +#ifdef i1480u_FLOW_CONTROL +error_notif_urb_submit: +#endif + 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; + struct uwb_rc *rc = wlp->rc; + + BUG_ON(wlp->rc == NULL); + wlp_wss_remove(&wlp->wss); + uwb_notifs_deregister(rc, &i1480u->uwb_notifs_handler); + netif_carrier_off(net_dev); +#ifdef i1480u_FLOW_CONTROL + usb_kill_urb(i1480u->notif_urb); +#endif + netif_stop_queue(net_dev); + i1480u_rx_release(i1480u); + i1480u_tx_release(i1480u); + return 0; +} + + +/** Report statistics */ +struct net_device_stats *i1480u_get_stats(struct net_device *net_dev) +{ + struct i1480u *i1480u = netdev_priv(net_dev); + return &i1480u->stats; +} + + +/** + * + * 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; +} + + +/** + * Callback function to handle events from UWB + * When we see other devices we know the carrier is ok, + * if we are the only device in the beacon group we set the carrier + * state to off. + * */ +void i1480u_uwb_notifs_cb(void *data, struct uwb_dev *uwb_dev, + enum uwb_notifs event) +{ + struct i1480u *i1480u = data; + struct net_device *net_dev = i1480u->net_dev; + struct device *dev = &i1480u->usb_iface->dev; + switch (event) { + case UWB_NOTIF_BG_JOIN: + netif_carrier_on(net_dev); + dev_info(dev, "Link is up\n"); + break; + case UWB_NOTIF_BG_LEAVE: + netif_carrier_off(net_dev); + dev_info(dev, "Link is down\n"); + break; + default: + dev_err(dev, "don't know how to handle event %d from uwb\n", + event); + } +} + +/** + * 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); +} |