drivers/net/wireless/prism54/islpci_mgt.c

   1 /*
   2  *  Copyright (C) 2002 Intersil Americas Inc.
   3  *  Copyright 2004 Jens Maurer <Jens.Maurer@gmx.net>
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, write to the Free Software
  16  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  *
  18  */
  19
  20 #include <linux/netdevice.h>
  21 #include <linux/module.h>
  22 #include <linux/pci.h>
  23 #include <linux/sched.h>
  24 #include <linux/slab.h>
  25
  26 #include <asm/io.h>
  27 #include <linux/if_arp.h>
  28
  29 #include "prismcompat.h"
  30 #include "isl_38xx.h"
  31 #include "islpci_mgt.h"
  32 #include "isl_oid.h"            /* additional types and defs for isl38xx fw */
  33 #include "isl_ioctl.h"
  34
  35 #include <net/iw_handler.h>
  36
  37 /******************************************************************************
  38         Global variable definition section
  39 ******************************************************************************/
  40 int pc_debug = VERBOSE;
  41 module_param(pc_debug, int, 0);
  42
  43 /******************************************************************************
  44     Driver general functions
  45 ******************************************************************************/
  46 #if VERBOSE > SHOW_ERROR_MESSAGES
  47 void
  48 display_buffer(char *buffer, int length)
  49 {
  50         if ((pc_debug & SHOW_BUFFER_CONTENTS) == 0)
  51                 return;
  52
  53         while (length > 0) {
  54                 printk("[%02x]", *buffer & 255);
  55                 length--;
  56                 buffer++;
  57         }
  58
  59         printk("\n");
  60 }
  61 #endif
  62
  63 /*****************************************************************************
  64     Queue handling for management frames
  65 ******************************************************************************/
  66
  67 /*
  68  * Helper function to create a PIMFOR management frame header.
  69  */
  70 static void
  71 pimfor_encode_header(int operation, u32 oid, u32 length, pimfor_header_t *h)
  72 {
  73         h->version = PIMFOR_VERSION;
  74         h->operation = operation;
  75         h->device_id = PIMFOR_DEV_ID_MHLI_MIB;
  76         h->flags = 0;
  77         h->oid = cpu_to_be32(oid);
  78         h->length = cpu_to_be32(length);
  79 }
  80
  81 /*
  82  * Helper function to analyze a PIMFOR management frame header.
  83  */
  84 static pimfor_header_t *
  85 pimfor_decode_header(void *data, int len)
  86 {
  87         pimfor_header_t *h = data;
  88
  89         while ((void *) h < data + len) {
  90                 if (h->flags & PIMFOR_FLAG_LITTLE_ENDIAN) {
  91                         le32_to_cpus(&h->oid);
  92                         le32_to_cpus(&h->length);
  93                 } else {
  94                         be32_to_cpus(&h->oid);
  95                         be32_to_cpus(&h->length);
  96                 }
  97                 if (h->oid != OID_INL_TUNNEL)
  98                         return h;
  99                 h++;
 100         }
 101         return NULL;
 102 }
 103
 104 /*
 105  * Fill the receive queue for management frames with fresh buffers.
 106  */
 107 int
 108 islpci_mgmt_rx_fill(struct net_device *ndev)
 109 {
 110         islpci_private *priv = netdev_priv(ndev);
 111         isl38xx_control_block *cb =     /* volatile not needed */
 112             (isl38xx_control_block *) priv->control_block;
 113         u32 curr = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_RX_MGMTQ]);
 114
 115 #if VERBOSE > SHOW_ERROR_MESSAGES
 116         DEBUG(SHOW_FUNCTION_CALLS, "islpci_mgmt_rx_fill\n");
 117 #endif
 118
 119         while (curr - priv->index_mgmt_rx < ISL38XX_CB_MGMT_QSIZE) {
 120                 u32 index = curr % ISL38XX_CB_MGMT_QSIZE;
 121                 struct islpci_membuf *buf = &priv->mgmt_rx[index];
 122                 isl38xx_fragment *frag = &cb->rx_data_mgmt[index];
 123
 124                 if (buf->mem == NULL) {
 125                         buf->mem = kmalloc(MGMT_FRAME_SIZE, GFP_ATOMIC);
 126                         if (!buf->mem)
 127                                 return -ENOMEM;
 128                         buf->size = MGMT_FRAME_SIZE;
 129                 }
 130                 if (buf->pci_addr == 0) {
 131                         buf->pci_addr = pci_map_single(priv->pdev, buf->mem,
 132                                                        MGMT_FRAME_SIZE,
 133                                                        PCI_DMA_FROMDEVICE);
 134                         if (!buf->pci_addr) {
 135                                 printk(KERN_WARNING
 136                                        "Failed to make memory DMA'able.\n");
 137                                 return -ENOMEM;
 138                         }
 139                 }
 140
 141                 /* be safe: always reset control block information */
 142                 frag->size = cpu_to_le16(MGMT_FRAME_SIZE);
 143                 frag->flags = 0;
 144                 frag->address = cpu_to_le32(buf->pci_addr);
 145                 curr++;
 146
 147                 /* The fragment address in the control block must have
 148                  * been written before announcing the frame buffer to
 149                  * device */
 150                 wmb();
 151                 cb->driver_curr_frag[ISL38XX_CB_RX_MGMTQ] = cpu_to_le32(curr);
 152         }
 153         return 0;
 154 }
 155
 156 /*
 157  * Create and transmit a management frame using "operation" and "oid",
 158  * with arguments data/length.
 159  * We either return an error and free the frame, or we return 0 and
 160  * islpci_mgt_cleanup_transmit() frees the frame in the tx-done
 161  * interrupt.
 162  */
 163 static int
 164 islpci_mgt_transmit(struct net_device *ndev, int operation, unsigned long oid,
 165                     void *data, int length)
 166 {
 167         islpci_private *priv = netdev_priv(ndev);
 168         isl38xx_control_block *cb =
 169             (isl38xx_control_block *) priv->control_block;
 170         void *p;
 171         int err = -EINVAL;
 172         unsigned long flags;
 173         isl38xx_fragment *frag;
 174         struct islpci_membuf buf;
 175         u32 curr_frag;
 176         int index;
 177         int frag_len = length + PIMFOR_HEADER_SIZE;
 178
 179 #if VERBOSE > SHOW_ERROR_MESSAGES
 180         DEBUG(SHOW_FUNCTION_CALLS, "islpci_mgt_transmit\n");
 181 #endif
 182
 183         if (frag_len > MGMT_FRAME_SIZE) {
 184                 printk(KERN_DEBUG "%s: mgmt frame too large %d\n",
 185                        ndev->name, frag_len);
 186                 goto error;
 187         }
 188
 189         err = -ENOMEM;
 190         p = buf.mem = kmalloc(frag_len, GFP_KERNEL);
 191         if (!buf.mem)
 192                 goto error;
 193
 194         buf.size = frag_len;
 195
 196         /* create the header directly in the fragment data area */
 197         pimfor_encode_header(operation, oid, length, (pimfor_header_t *) p);
 198         p += PIMFOR_HEADER_SIZE;
 199
 200         if (data)
 201                 memcpy(p, data, length);
 202         else
 203                 memset(p, 0, length);
 204
 205 #if VERBOSE > SHOW_ERROR_MESSAGES
 206         {
 207                 pimfor_header_t *h = buf.mem;
 208                 DEBUG(SHOW_PIMFOR_FRAMES,
 209                       "PIMFOR: op %i, oid 0x%08lx, device %i, flags 0x%x length 0x%x\n",
 210                       h->operation, oid, h->device_id, h->flags, length);
 211
 212                 /* display the buffer contents for debugging */
 213                 display_buffer((char *) h, sizeof (pimfor_header_t));
 214                 display_buffer(p, length);
 215         }
 216 #endif
 217
 218         err = -ENOMEM;
 219         buf.pci_addr = pci_map_single(priv->pdev, buf.mem, frag_len,
 220                                       PCI_DMA_TODEVICE);
 221         if (!buf.pci_addr) {
 222                 printk(KERN_WARNING "%s: cannot map PCI memory for mgmt\n",
 223                        ndev->name);
 224                 goto error_free;
 225         }
 226
 227         /* Protect the control block modifications against interrupts. */
 228         spin_lock_irqsave(&priv->slock, flags);
 229         curr_frag = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_TX_MGMTQ]);
 230         if (curr_frag - priv->index_mgmt_tx >= ISL38XX_CB_MGMT_QSIZE) {
 231                 printk(KERN_WARNING "%s: mgmt tx queue is still full\n",
 232                        ndev->name);
 233                 goto error_unlock;
 234         }
 235
 236         /* commit the frame to the tx device queue */
 237         index = curr_frag % ISL38XX_CB_MGMT_QSIZE;
 238         priv->mgmt_tx[index] = buf;
 239         frag = &cb->tx_data_mgmt[index];
 240         frag->size = cpu_to_le16(frag_len);
 241         frag->flags = 0;        /* for any other than the last fragment, set to 1 */
 242         frag->address = cpu_to_le32(buf.pci_addr);
 243
 244         /* The fragment address in the control block must have
 245          * been written before announcing the frame buffer to
 246          * device */
 247         wmb();
 248         cb->driver_curr_frag[ISL38XX_CB_TX_MGMTQ] = cpu_to_le32(curr_frag + 1);
 249         spin_unlock_irqrestore(&priv->slock, flags);
 250
 251         /* trigger the device */
 252         islpci_trigger(priv);
 253         return 0;
 254
 255       error_unlock:
 256         spin_unlock_irqrestore(&priv->slock, flags);
 257       error_free:
 258         kfree(buf.mem);
 259       error:
 260         return err;
 261 }
 262
 263 /*
 264  * Receive a management frame from the device.
 265  * This can be an arbitrary number of traps, and at most one response
 266  * frame for a previous request sent via islpci_mgt_transmit().
 267  */
 268 int
 269 islpci_mgt_receive(struct net_device *ndev)
 270 {
 271         islpci_private *priv = netdev_priv(ndev);
 272         isl38xx_control_block *cb =
 273             (isl38xx_control_block *) priv->control_block;
 274         u32 curr_frag;
 275
 276 #if VERBOSE > SHOW_ERROR_MESSAGES
 277         DEBUG(SHOW_FUNCTION_CALLS, "islpci_mgt_receive\n");
 278 #endif
 279
 280         /* Only once per interrupt, determine fragment range to
 281          * process.  This avoids an endless loop (i.e. lockup) if
 282          * frames come in faster than we can process them. */
 283         curr_frag = le32_to_cpu(cb->device_curr_frag[ISL38XX_CB_RX_MGMTQ]);
 284         barrier();
 285
 286         for (; priv->index_mgmt_rx < curr_frag; priv->index_mgmt_rx++) {
 287                 pimfor_header_t *header;
 288                 u32 index = priv->index_mgmt_rx % ISL38XX_CB_MGMT_QSIZE;
 289                 struct islpci_membuf *buf = &priv->mgmt_rx[index];
 290                 u16 frag_len;
 291                 int size;
 292                 struct islpci_mgmtframe *frame;
 293
 294                 /* I have no idea (and no documentation) if flags != 0
 295                  * is possible.  Drop the frame, reuse the buffer. */
 296                 if (le16_to_cpu(cb->rx_data_mgmt[index].flags) != 0) {
 297                         printk(KERN_WARNING "%s: unknown flags 0x%04x\n",
 298                                ndev->name,
 299                                le16_to_cpu(cb->rx_data_mgmt[index].flags));
 300                         continue;
 301                 }
 302
 303                 /* The device only returns the size of the header(s) here. */
 304                 frag_len = le16_to_cpu(cb->rx_data_mgmt[index].size);
 305
 306                 /*
 307                  * We appear to have no way to tell the device the
 308                  * size of a receive buffer.  Thus, if this check
 309                  * triggers, we likely have kernel heap corruption. */
 310                 if (frag_len > MGMT_FRAME_SIZE) {
 311                         printk(KERN_WARNING
 312                                 "%s: Bogus packet size of %d (%#x).\n",
 313                                 ndev->name, frag_len, frag_len);
 314                         frag_len = MGMT_FRAME_SIZE;
 315                 }
 316
 317                 /* Ensure the results of device DMA are visible to the CPU. */
 318                 pci_dma_sync_single_for_cpu(priv->pdev, buf->pci_addr,
 319                                             buf->size, PCI_DMA_FROMDEVICE);
 320
 321                 /* Perform endianess conversion for PIMFOR header in-place. */
 322                 header = pimfor_decode_header(buf->mem, frag_len);
 323                 if (!header) {
 324                         printk(KERN_WARNING "%s: no PIMFOR header found\n",
 325                                ndev->name);
 326                         continue;
 327                 }
 328
 329                 /* The device ID from the PIMFOR packet received from
 330                  * the MVC is always 0.  We forward a sensible device_id.
 331                  * Not that anyone upstream would care... */
 332                 header->device_id = priv->ndev->ifindex;
 333
 334 #if VERBOSE > SHOW_ERROR_MESSAGES
 335                 DEBUG(SHOW_PIMFOR_FRAMES,
 336                       "PIMFOR: op %i, oid 0x%08x, device %i, flags 0x%x length 0x%x\n",
 337                       header->operation, header->oid, header->device_id,
 338                       header->flags, header->length);
 339
 340                 /* display the buffer contents for debugging */
 341                 display_buffer((char *) header, PIMFOR_HEADER_SIZE);
 342                 display_buffer((char *) header + PIMFOR_HEADER_SIZE,
 343                                header->length);
 344 #endif
 345
 346                 /* nobody sends these */
 347                 if (header->flags & PIMFOR_FLAG_APPLIC_ORIGIN) {
 348                         printk(KERN_DEBUG
 349                                "%s: errant PIMFOR application frame\n",
 350                                ndev->name);
 351                         continue;
 352                 }
 353
 354                 /* Determine frame size, skipping OID_INL_TUNNEL headers. */
 355                 size = PIMFOR_HEADER_SIZE + header->length;
 356                 frame = kmalloc(sizeof(struct islpci_mgmtframe) + size,
 357                                 GFP_ATOMIC);
 358                 if (!frame)
 359                         continue;
 360
 361                 frame->ndev = ndev;
 362                 memcpy(&frame->buf, header, size);
 363                 frame->header = (pimfor_header_t *) frame->buf;
 364                 frame->data = frame->buf + PIMFOR_HEADER_SIZE;
 365
 366 #if VERBOSE > SHOW_ERROR_MESSAGES
 367                 DEBUG(SHOW_PIMFOR_FRAMES,
 368                       "frame: header: %p, data: %p, size: %d\n",
 369                       frame->header, frame->data, size);
 370 #endif
 371
 372                 if (header->operation == PIMFOR_OP_TRAP) {
 373 #if VERBOSE > SHOW_ERROR_MESSAGES
 374                         printk(KERN_DEBUG
 375                                "TRAP: oid 0x%x, device %i, flags 0x%x length %i\n",
 376                                header->oid, header->device_id, header->flags,
 377                                header->length);
 378 #endif
 379
 380                         /* Create work to handle trap out of interrupt
 381                          * context. */
 382                         INIT_WORK(&frame->ws, prism54_process_trap);
 383                         schedule_work(&frame->ws);
 384
 385                 } else {
 386                         /* Signal the one waiting process that a response
 387                          * has been received. */
 388                         if ((frame = xchg(&priv->mgmt_received, frame)) != NULL) {
 389                                 printk(KERN_WARNING
 390                                        "%s: mgmt response not collected\n",
 391                                        ndev->name);
 392                                 kfree(frame);
 393                         }
 394 #if VERBOSE > SHOW_ERROR_MESSAGES
 395                         DEBUG(SHOW_TRACING, "Wake up Mgmt Queue\n");
 396 #endif
 397                         wake_up(&priv->mgmt_wqueue);
 398                 }
 399
 400         }
 401
 402         return 0;
 403 }
 404
 405 /*
 406  * Cleanup the transmit queue by freeing all frames handled by the device.
 407  */
 408 void
 409 islpci_mgt_cleanup_transmit(struct net_device *ndev)
 410 {
 411         islpci_private *priv = netdev_priv(ndev);
 412         isl38xx_control_block *cb =     /* volatile not needed */
 413             (isl38xx_control_block *) priv->control_block;
 414         u32 curr_frag;
 415
 416 #if VERBOSE > SHOW_ERROR_MESSAGES
 417         DEBUG(SHOW_FUNCTION_CALLS, "islpci_mgt_cleanup_transmit\n");
 418 #endif
 419
 420         /* Only once per cleanup, determine fragment range to
 421          * process.  This avoids an endless loop (i.e. lockup) if
 422          * the device became confused, incrementing device_curr_frag
 423          * rapidly. */
 424         curr_frag = le32_to_cpu(cb->device_curr_frag[ISL38XX_CB_TX_MGMTQ]);
 425         barrier();
 426
 427         for (; priv->index_mgmt_tx < curr_frag; priv->index_mgmt_tx++) {
 428                 int index = priv->index_mgmt_tx % ISL38XX_CB_MGMT_QSIZE;
 429                 struct islpci_membuf *buf = &priv->mgmt_tx[index];
 430                 pci_unmap_single(priv->pdev, buf->pci_addr, buf->size,
 431                                  PCI_DMA_TODEVICE);
 432                 buf->pci_addr = 0;
 433                 kfree(buf->mem);
 434                 buf->mem = NULL;
 435                 buf->size = 0;
 436         }
 437 }
 438
 439 /*
 440  * Perform one request-response transaction to the device.
 441  */
 442 int
 443 islpci_mgt_transaction(struct net_device *ndev,
 444                        int operation, unsigned long oid,
 445                        void *senddata, int sendlen,
 446                        struct islpci_mgmtframe **recvframe)
 447 {
 448         islpci_private *priv = netdev_priv(ndev);
 449         const long wait_cycle_jiffies = msecs_to_jiffies(ISL38XX_WAIT_CYCLE * 10);
 450         long timeout_left = ISL38XX_MAX_WAIT_CYCLES * wait_cycle_jiffies;
 451         int err;
 452         DEFINE_WAIT(wait);
 453
 454         *recvframe = NULL;
 455
 456         if (mutex_lock_interruptible(&priv->mgmt_lock))
 457                 return -ERESTARTSYS;
 458
 459         prepare_to_wait(&priv->mgmt_wqueue, &wait, TASK_UNINTERRUPTIBLE);
 460         err = islpci_mgt_transmit(ndev, operation, oid, senddata, sendlen);
 461         if (err)
 462                 goto out;
 463
 464         err = -ETIMEDOUT;
 465         while (timeout_left > 0) {
 466                 int timeleft;
 467                 struct islpci_mgmtframe *frame;
 468
 469                 timeleft = schedule_timeout_uninterruptible(wait_cycle_jiffies);
 470                 frame = xchg(&priv->mgmt_received, NULL);
 471                 if (frame) {
 472                         if (frame->header->oid == oid) {
 473                                 *recvframe = frame;
 474                                 err = 0;
 475                                 goto out;
 476                         } else {
 477                                 printk(KERN_DEBUG
 478                                        "%s: expecting oid 0x%x, received 0x%x.\n",
 479                                        ndev->name, (unsigned int) oid,
 480                                        frame->header->oid);
 481                                 kfree(frame);
 482                                 frame = NULL;
 483                         }
 484                 }
 485                 if (timeleft == 0) {
 486                         printk(KERN_DEBUG
 487                                 "%s: timeout waiting for mgmt response %lu, "
 488                                 "triggering device\n",
 489                                 ndev->name, timeout_left);
 490                         islpci_trigger(priv);
 491                 }
 492                 timeout_left += timeleft - wait_cycle_jiffies;
 493         }
 494         printk(KERN_WARNING "%s: timeout waiting for mgmt response\n",
 495                ndev->name);
 496
 497         /* TODO: we should reset the device here */
 498  out:
 499         finish_wait(&priv->mgmt_wqueue, &wait);
 500         mutex_unlock(&priv->mgmt_lock);
 501         return err;
 502 }
 503