drivers/uwb/i1480/i1480u-wlp/netdev.c

   1 /*
   2  * WUSB Wire Adapter: WLP interface
   3  * Driver for the Linux Network stack.
   4  *
   5  * Copyright (C) 2005-2006 Intel Corporation
   6  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License version
  10  * 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA.
  21  *
  22  *
  23  * FIXME: docs
  24  *
  25  * Implementation of the netdevice linkage (except tx and rx related stuff).
  26  *
  27  * ROADMAP:
  28  *
  29  *   ENTRY POINTS (Net device):
  30  *
  31  *     i1480u_open(): Called when we ifconfig up the interface;
  32  *                    associates to a UWB host controller, reserves
  33  *                    bandwidth (MAS), sets up RX USB URB and starts
  34  *                    the queue.
  35  *
  36  *     i1480u_stop(): Called when we ifconfig down a interface;
  37  *                    reverses _open().
  38  *
  39  *     i1480u_set_config():
  40  */
  41
  42 #include <linux/if_arp.h>
  43 #include <linux/etherdevice.h>
  44
  45 #include "i1480u-wlp.h"
  46
  47 struct i1480u_cmd_set_ip_mas {
  48         struct uwb_rccb     rccb;
  49         struct uwb_dev_addr addr;
  50         u8                  stream;
  51         u8                  owner;
  52         u8                  type;       /* enum uwb_drp_type */
  53         u8                  baMAS[32];
  54 } __attribute__((packed));
  55
  56
  57 static
  58 int i1480u_set_ip_mas(
  59         struct uwb_rc *rc,
  60         const struct uwb_dev_addr *dstaddr,
  61         u8 stream, u8 owner, u8 type, unsigned long *mas)
  62 {
  63
  64         int result;
  65         struct i1480u_cmd_set_ip_mas *cmd;
  66         struct uwb_rc_evt_confirm reply;
  67
  68         result = -ENOMEM;
  69         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
  70         if (cmd == NULL)
  71                 goto error_kzalloc;
  72         cmd->rccb.bCommandType = 0xfd;
  73         cmd->rccb.wCommand = cpu_to_le16(0x000e);
  74         cmd->addr = *dstaddr;
  75         cmd->stream = stream;
  76         cmd->owner = owner;
  77         cmd->type = type;
  78         if (mas == NULL)
  79                 memset(cmd->baMAS, 0x00, sizeof(cmd->baMAS));
  80         else
  81                 memcpy(cmd->baMAS, mas, sizeof(cmd->baMAS));
  82         reply.rceb.bEventType = 0xfd;
  83         reply.rceb.wEvent = cpu_to_le16(0x000e);
  84         result = uwb_rc_cmd(rc, "SET-IP-MAS", &cmd->rccb, sizeof(*cmd),
  85                             &reply.rceb, sizeof(reply));
  86         if (result < 0)
  87                 goto error_cmd;
  88         if (reply.bResultCode != UWB_RC_RES_FAIL) {
  89                 dev_err(&rc->uwb_dev.dev,
  90                         "SET-IP-MAS: command execution failed: %d\n",
  91                         reply.bResultCode);
  92                 result = -EIO;
  93         }
  94 error_cmd:
  95         kfree(cmd);
  96 error_kzalloc:
  97         return result;
  98 }
  99
 100 /*
 101  * Inform a WLP interface of a MAS reservation
 102  *
 103  * @rc is assumed refcnted.
 104  */
 105 /* FIXME: detect if remote device is WLP capable? */
 106 static int i1480u_mas_set_dev(struct uwb_dev *uwb_dev, struct uwb_rc *rc,
 107                               u8 stream, u8 owner, u8 type, unsigned long *mas)
 108 {
 109         int result = 0;
 110         struct device *dev = &rc->uwb_dev.dev;
 111
 112         result = i1480u_set_ip_mas(rc, &uwb_dev->dev_addr, stream, owner,
 113                                    type, mas);
 114         if (result < 0) {
 115                 char rcaddrbuf[UWB_ADDR_STRSIZE], devaddrbuf[UWB_ADDR_STRSIZE];
 116                 uwb_dev_addr_print(rcaddrbuf, sizeof(rcaddrbuf),
 117                                    &rc->uwb_dev.dev_addr);
 118                 uwb_dev_addr_print(devaddrbuf, sizeof(devaddrbuf),
 119                                    &uwb_dev->dev_addr);
 120                 dev_err(dev, "Set IP MAS (%s to %s) failed: %d\n",
 121                         rcaddrbuf, devaddrbuf, result);
 122         }
 123         return result;
 124 }
 125
 126 /**
 127  * Called by bandwidth allocator when change occurs in reservation.
 128  *
 129  * @rsv:     The reservation that is being established, modified, or
 130  *           terminated.
 131  *
 132  * When a reservation is established, modified, or terminated the upper layer
 133  * (WLP here) needs set/update the currently available Media Access Slots
 134  * that can be use for IP traffic.
 135  *
 136  * Our action taken during failure depends on how the reservation is being
 137  * changed:
 138  * - if reservation is being established we do nothing if we cannot set the
 139  *   new MAS to be used
 140  * - if reservation is being terminated we revert back to PCA whether the
 141  *   SET IP MAS command succeeds or not.
 142  */
 143 void i1480u_bw_alloc_cb(struct uwb_rsv *rsv)
 144 {
 145         int result = 0;
 146         struct i1480u *i1480u = rsv->pal_priv;
 147         struct device *dev = &i1480u->usb_iface->dev;
 148         struct uwb_dev *target_dev = rsv->target.dev;
 149         struct uwb_rc *rc = i1480u->wlp.rc;
 150         u8 stream = rsv->stream;
 151         int type = rsv->type;
 152         int is_owner = rsv->owner == &rc->uwb_dev;
 153         unsigned long *bmp = rsv->mas.bm;
 154
 155         dev_err(dev, "WLP callback called - sending set ip mas\n");
 156         /*user cannot change options while setting configuration*/
 157         mutex_lock(&i1480u->options.mutex);
 158         switch (rsv->state) {
 159         case UWB_RSV_STATE_T_ACCEPTED:
 160         case UWB_RSV_STATE_O_ESTABLISHED:
 161                 result = i1480u_mas_set_dev(target_dev, rc, stream, is_owner,
 162                                         type, bmp);
 163                 if (result < 0) {
 164                         dev_err(dev, "MAS reservation failed: %d\n", result);
 165                         goto out;
 166                 }
 167                 if (is_owner) {
 168                         wlp_tx_hdr_set_delivery_id_type(&i1480u->options.def_tx_hdr,
 169                                                         WLP_DRP | stream);
 170                         wlp_tx_hdr_set_rts_cts(&i1480u->options.def_tx_hdr, 0);
 171                 }
 172                 break;
 173         case UWB_RSV_STATE_NONE:
 174                 /* revert back to PCA */
 175                 result = i1480u_mas_set_dev(target_dev, rc, stream, is_owner,
 176                                             type, bmp);
 177                 if (result < 0)
 178                         dev_err(dev, "MAS reservation failed: %d\n", result);
 179                 /* Revert to PCA even though SET IP MAS failed. */
 180                 wlp_tx_hdr_set_delivery_id_type(&i1480u->options.def_tx_hdr,
 181                                                 i1480u->options.pca_base_priority);
 182                 wlp_tx_hdr_set_rts_cts(&i1480u->options.def_tx_hdr, 1);
 183                 break;
 184         default:
 185                 dev_err(dev, "unexpected WLP reservation state: %s (%d).\n",
 186                         uwb_rsv_state_str(rsv->state), rsv->state);
 187                 break;
 188         }
 189 out:
 190         mutex_unlock(&i1480u->options.mutex);
 191         return;
 192 }
 193
 194 /**
 195  *
 196  * Called on 'ifconfig up'
 197  */
 198 int i1480u_open(struct net_device *net_dev)
 199 {
 200         int result;
 201         struct i1480u *i1480u = netdev_priv(net_dev);
 202         struct wlp *wlp = &i1480u->wlp;
 203         struct uwb_rc *rc;
 204         struct device *dev = &i1480u->usb_iface->dev;
 205
 206         rc = wlp->rc;
 207         result = i1480u_rx_setup(i1480u);               /* Alloc RX stuff */
 208         if (result < 0)
 209                 goto error_rx_setup;
 210
 211         result = uwb_radio_start(&wlp->pal);
 212         if (result < 0)
 213                 goto error_radio_start;
 214
 215         netif_wake_queue(net_dev);
 216 #ifdef i1480u_FLOW_CONTROL
 217         result = usb_submit_urb(i1480u->notif_urb, GFP_KERNEL);;
 218         if (result < 0) {
 219                 dev_err(dev, "Can't submit notification URB: %d\n", result);
 220                 goto error_notif_urb_submit;
 221         }
 222 #endif
 223         /* Interface is up with an address, now we can create WSS */
 224         result = wlp_wss_setup(net_dev, &wlp->wss);
 225         if (result < 0) {
 226                 dev_err(dev, "Can't create WSS: %d. \n", result);
 227                 goto error_wss_setup;
 228         }
 229         return 0;
 230 error_wss_setup:
 231 #ifdef i1480u_FLOW_CONTROL
 232         usb_kill_urb(i1480u->notif_urb);
 233 error_notif_urb_submit:
 234 #endif
 235         uwb_radio_stop(&wlp->pal);
 236 error_radio_start:
 237         netif_stop_queue(net_dev);
 238         i1480u_rx_release(i1480u);
 239 error_rx_setup:
 240         return result;
 241 }
 242
 243
 244 /**
 245  * Called on 'ifconfig down'
 246  */
 247 int i1480u_stop(struct net_device *net_dev)
 248 {
 249         struct i1480u *i1480u = netdev_priv(net_dev);
 250         struct wlp *wlp = &i1480u->wlp;
 251
 252         BUG_ON(wlp->rc == NULL);
 253         wlp_wss_remove(&wlp->wss);
 254         netif_carrier_off(net_dev);
 255 #ifdef i1480u_FLOW_CONTROL
 256         usb_kill_urb(i1480u->notif_urb);
 257 #endif
 258         netif_stop_queue(net_dev);
 259         uwb_radio_stop(&wlp->pal);
 260         i1480u_rx_release(i1480u);
 261         i1480u_tx_release(i1480u);
 262         return 0;
 263 }
 264
 265 /**
 266  *
 267  * Change the interface config--we probably don't have to do anything.
 268  */
 269 int i1480u_set_config(struct net_device *net_dev, struct ifmap *map)
 270 {
 271         int result;
 272         struct i1480u *i1480u = netdev_priv(net_dev);
 273         BUG_ON(i1480u->wlp.rc == NULL);
 274         result = 0;
 275         return result;
 276 }
 277
 278 /**
 279  * Change the MTU of the interface
 280  */
 281 int i1480u_change_mtu(struct net_device *net_dev, int mtu)
 282 {
 283         static union {
 284                 struct wlp_tx_hdr tx;
 285                 struct wlp_rx_hdr rx;
 286         } i1480u_all_hdrs;
 287
 288         if (mtu < ETH_HLEN)     /* We encap eth frames */
 289                 return -ERANGE;
 290         if (mtu > 4000 - sizeof(i1480u_all_hdrs))
 291                 return -ERANGE;
 292         net_dev->mtu = mtu;
 293         return 0;
 294 }
 295
 296 /**
 297  * Stop the network queue
 298  *
 299  * Enable WLP substack to stop network queue. We also set the flow control
 300  * threshold at this time to prevent the flow control from restarting the
 301  * queue.
 302  *
 303  * we are loosing the current threshold value here ... FIXME?
 304  */
 305 void i1480u_stop_queue(struct wlp *wlp)
 306 {
 307         struct i1480u *i1480u = container_of(wlp, struct i1480u, wlp);
 308         struct net_device *net_dev = i1480u->net_dev;
 309         i1480u->tx_inflight.threshold = 0;
 310         netif_stop_queue(net_dev);
 311 }
 312
 313 /**
 314  * Start the network queue
 315  *
 316  * Enable WLP substack to start network queue. Also re-enable the flow
 317  * control to manage the queue again.
 318  *
 319  * We re-enable the flow control by storing the default threshold in the
 320  * flow control threshold. This means that if the user modified the
 321  * threshold before the queue was stopped and restarted that information
 322  * will be lost. FIXME?
 323  */
 324 void i1480u_start_queue(struct wlp *wlp)
 325 {
 326         struct i1480u *i1480u = container_of(wlp, struct i1480u, wlp);
 327         struct net_device *net_dev = i1480u->net_dev;
 328         i1480u->tx_inflight.threshold = i1480u_TX_INFLIGHT_THRESHOLD;
 329         netif_start_queue(net_dev);
 330 }