LXR linux/drivers/net/wireless/prism54/islpci

   1/*
   2 *  Copyright (C) 2002 Intersil Americas Inc.
   3 *  Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
   4 *  This program is free software; you can redistribute it and/or modify
   5 *  it under the terms of the GNU General Public License as published by
   6 *  the Free Software Foundation; either version 2 of the License
   7 *
   8 *  This program is distributed in the hope that it will be useful,
   9 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 *  GNU General Public License for more details.
  12 *
  13 *  You should have received a copy of the GNU General Public License
  14 *  along with this program; if not, write to the Free Software
  15 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16 *
  17 */
  18
  19#include <linux/module.h>
  20
  21#include <linux/pci.h>
  22#include <linux/delay.h>
  23#include <linux/netdevice.h>
  24#include <linux/etherdevice.h>
  25#include <linux/if_arp.h>
  26#include <asm/byteorder.h>
  27
  28#include "prismcompat.h"
  29#include "isl_38xx.h"
  30#include "islpci_eth.h"
  31#include "islpci_mgt.h"
  32#include "oid_mgt.h"
  33
  34/******************************************************************************
  35    Network Interface functions
  36******************************************************************************/
  37void
  38islpci_eth_cleanup_transmit(islpci_private *priv,
  39                            isl38xx_control_block *control_block)
  40{
  41        struct sk_buff *skb;
  42        u32 index;
  43
  44        /* compare the control block read pointer with the free pointer */
  45        while (priv->free_data_tx !=
  46               le32_to_cpu(control_block->
  47                           device_curr_frag[ISL38XX_CB_TX_DATA_LQ])) {
  48                /* read the index of the first fragment to be freed */
  49                index = priv->free_data_tx % ISL38XX_CB_TX_QSIZE;
  50
  51                /* check for holes in the arrays caused by multi fragment frames
  52                 * searching for the last fragment of a frame */
  53                if (priv->pci_map_tx_address[index]) {
  54                        /* entry is the last fragment of a frame
  55                         * free the skb structure and unmap pci memory */
  56                        skb = priv->data_low_tx[index];
  57
  58#if VERBOSE > SHOW_ERROR_MESSAGES
  59                        DEBUG(SHOW_TRACING,
  60                              "cleanup skb %p skb->data %p skb->len %u truesize %u\n ",
  61                              skb, skb->data, skb->len, skb->truesize);
  62#endif
  63
  64                        pci_unmap_single(priv->pdev,
  65                                         priv->pci_map_tx_address[index],
  66                                         skb->len, PCI_DMA_TODEVICE);
  67                        dev_kfree_skb_irq(skb);
  68                        skb = NULL;
  69                }
  70                /* increment the free data low queue pointer */
  71                priv->free_data_tx++;
  72        }
  73}
  74
  75netdev_tx_t
  76islpci_eth_transmit(struct sk_buff *skb, struct net_device *ndev)
  77{
  78        islpci_private *priv = netdev_priv(ndev);
  79        isl38xx_control_block *cb = priv->control_block;
  80        u32 index;
  81        dma_addr_t pci_map_address;
  82        int frame_size;
  83        isl38xx_fragment *fragment;
  84        int offset;
  85        struct sk_buff *newskb;
  86        int newskb_offset;
  87        unsigned long flags;
  88        unsigned char wds_mac[6];
  89        u32 curr_frag;
  90
  91#if VERBOSE > SHOW_ERROR_MESSAGES
  92        DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_transmit \n");
  93#endif
  94
  95        /* lock the driver code */
  96        spin_lock_irqsave(&priv->slock, flags);
  97
  98        /* check whether the destination queue has enough fragments for the frame */
  99        curr_frag = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ]);
 100        if (unlikely(curr_frag - priv->free_data_tx >= ISL38XX_CB_TX_QSIZE)) {
 101                printk(KERN_ERR "%s: transmit device queue full when awake\n",
 102                       ndev->name);
 103                netif_stop_queue(ndev);
 104
 105                /* trigger the device */
 106                isl38xx_w32_flush(priv->device_base, ISL38XX_DEV_INT_UPDATE,
 107                                  ISL38XX_DEV_INT_REG);
 108                udelay(ISL38XX_WRITEIO_DELAY);
 109                goto drop_free;
 110        }
 111        /* Check alignment and WDS frame formatting. The start of the packet should
 112         * be aligned on a 4-byte boundary. If WDS is enabled add another 6 bytes
 113         * and add WDS address information */
 114        if (likely(((long) skb->data & 0x03) | init_wds)) {
 115                /* get the number of bytes to add and re-allign */
 116                offset = (4 - (long) skb->data) & 0x03;
 117                offset += init_wds ? 6 : 0;
 118
 119                /* check whether the current skb can be used  */
 120                if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
 121                        unsigned char *src = skb->data;
 122
 123#if VERBOSE > SHOW_ERROR_MESSAGES
 124                        DEBUG(SHOW_TRACING, "skb offset %i wds %i\n", offset,
 125                              init_wds);
 126#endif
 127
 128                        /* align the buffer on 4-byte boundary */
 129                        skb_reserve(skb, (4 - (long) skb->data) & 0x03);
 130                        if (init_wds) {
 131                                /* wds requires an additional address field of 6 bytes */
 132                                skb_put(skb, 6);
 133#ifdef ISLPCI_ETH_DEBUG
 134                                printk("islpci_eth_transmit:wds_mac\n");
 135#endif
 136                                memmove(skb->data + 6, src, skb->len);
 137                                skb_copy_to_linear_data(skb, wds_mac, 6);
 138                        } else {
 139                                memmove(skb->data, src, skb->len);
 140                        }
 141
 142#if VERBOSE > SHOW_ERROR_MESSAGES
 143                        DEBUG(SHOW_TRACING, "memmove %p %p %i \n", skb->data,
 144                              src, skb->len);
 145#endif
 146                } else {
 147                        newskb =
 148                            dev_alloc_skb(init_wds ? skb->len + 6 : skb->len);
 149                        if (unlikely(newskb == NULL)) {
 150                                printk(KERN_ERR "%s: Cannot allocate skb\n",
 151                                       ndev->name);
 152                                goto drop_free;
 153                        }
 154                        newskb_offset = (4 - (long) newskb->data) & 0x03;
 155
 156                        /* Check if newskb->data is aligned */
 157                        if (newskb_offset)
 158                                skb_reserve(newskb, newskb_offset);
 159
 160                        skb_put(newskb, init_wds ? skb->len + 6 : skb->len);
 161                        if (init_wds) {
 162                                skb_copy_from_linear_data(skb,
 163                                                          newskb->data + 6,
 164                                                          skb->len);
 165                                skb_copy_to_linear_data(newskb, wds_mac, 6);
 166#ifdef ISLPCI_ETH_DEBUG
 167                                printk("islpci_eth_transmit:wds_mac\n");
 168#endif
 169                        } else
 170                                skb_copy_from_linear_data(skb, newskb->data,
 171                                                          skb->len);
 172
 173#if VERBOSE > SHOW_ERROR_MESSAGES
 174                        DEBUG(SHOW_TRACING, "memcpy %p %p %i wds %i\n",
 175                              newskb->data, skb->data, skb->len, init_wds);
 176#endif
 177
 178                        newskb->dev = skb->dev;
 179                        dev_kfree_skb_irq(skb);
 180                        skb = newskb;
 181                }
 182        }
 183        /* display the buffer contents for debugging */
 184#if VERBOSE > SHOW_ERROR_MESSAGES
 185        DEBUG(SHOW_BUFFER_CONTENTS, "\ntx %p ", skb->data);
 186        display_buffer((char *) skb->data, skb->len);
 187#endif
 188
 189        /* map the skb buffer to pci memory for DMA operation */
 190        pci_map_address = pci_map_single(priv->pdev,
 191                                         (void *) skb->data, skb->len,
 192                                         PCI_DMA_TODEVICE);
 193        if (unlikely(pci_map_address == 0)) {
 194                printk(KERN_WARNING "%s: cannot map buffer to PCI\n",
 195                       ndev->name);
 196                goto drop_free;
 197        }
 198        /* Place the fragment in the control block structure. */
 199        index = curr_frag % ISL38XX_CB_TX_QSIZE;
 200        fragment = &cb->tx_data_low[index];
 201
 202        priv->pci_map_tx_address[index] = pci_map_address;
 203        /* store the skb address for future freeing  */
 204        priv->data_low_tx[index] = skb;
 205        /* set the proper fragment start address and size information */
 206        frame_size = skb->len;
 207        fragment->size = cpu_to_le16(frame_size);
 208        fragment->flags = cpu_to_le16(0);       /* set to 1 if more fragments */
 209        fragment->address = cpu_to_le32(pci_map_address);
 210        curr_frag++;
 211
 212        /* The fragment address in the control block must have been
 213         * written before announcing the frame buffer to device. */
 214        wmb();
 215        cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ] = cpu_to_le32(curr_frag);
 216
 217        if (curr_frag - priv->free_data_tx + ISL38XX_MIN_QTHRESHOLD
 218            > ISL38XX_CB_TX_QSIZE) {
 219                /* stop sends from upper layers */
 220                netif_stop_queue(ndev);
 221
 222                /* set the full flag for the transmission queue */
 223                priv->data_low_tx_full = 1;
 224        }
 225
 226        /* set the transmission time */
 227        ndev->trans_start = jiffies;
 228        ndev->stats.tx_packets++;
 229        ndev->stats.tx_bytes += skb->len;
 230
 231        /* trigger the device */
 232        islpci_trigger(priv);
 233
 234        /* unlock the driver code */
 235        spin_unlock_irqrestore(&priv->slock, flags);
 236
 237        return NETDEV_TX_OK;
 238
 239      drop_free:
 240        ndev->stats.tx_dropped++;
 241        spin_unlock_irqrestore(&priv->slock, flags);
 242        dev_kfree_skb(skb);
 243        return NETDEV_TX_OK;
 244}
 245
 246static inline int
 247islpci_monitor_rx(islpci_private *priv, struct sk_buff **skb)
 248{
 249        /* The card reports full 802.11 packets but with a 20 bytes
 250         * header and without the FCS. But there a is a bit that
 251         * indicates if the packet is corrupted :-) */
 252        struct rfmon_header *hdr = (struct rfmon_header *) (*skb)->data;
 253
 254        if (hdr->flags & 0x01)
 255                /* This one is bad. Drop it ! */
 256                return -1;
 257        if (priv->ndev->type == ARPHRD_IEEE80211_PRISM) {
 258                struct avs_80211_1_header *avs;
 259                /* extract the relevant data from the header */
 260                u32 clock = le32_to_cpu(hdr->clock);
 261                u8 rate = hdr->rate;
 262                u16 freq = le16_to_cpu(hdr->freq);
 263                u8 rssi = hdr->rssi;
 264
 265                skb_pull(*skb, sizeof (struct rfmon_header));
 266
 267                if (skb_headroom(*skb) < sizeof (struct avs_80211_1_header)) {
 268                        struct sk_buff *newskb = skb_copy_expand(*skb,
 269                                                                 sizeof (struct
 270                                                                         avs_80211_1_header),
 271                                                                 0, GFP_ATOMIC);
 272                        if (newskb) {
 273                                dev_kfree_skb_irq(*skb);
 274                                *skb = newskb;
 275                        } else
 276                                return -1;
 277                        /* This behavior is not very subtile... */
 278                }
 279
 280                /* make room for the new header and fill it. */
 281                avs =
 282                    (struct avs_80211_1_header *) skb_push(*skb,
 283                                                           sizeof (struct
 284                                                                   avs_80211_1_header));
 285
 286                avs->version = cpu_to_be32(P80211CAPTURE_VERSION);
 287                avs->length = cpu_to_be32(sizeof (struct avs_80211_1_header));
 288                avs->mactime = cpu_to_be64(clock);
 289                avs->hosttime = cpu_to_be64(jiffies);
 290                avs->phytype = cpu_to_be32(6);  /*OFDM: 6 for (g), 8 for (a) */
 291                avs->channel = cpu_to_be32(channel_of_freq(freq));
 292                avs->datarate = cpu_to_be32(rate * 5);
 293                avs->antenna = cpu_to_be32(0);  /*unknown */
 294                avs->priority = cpu_to_be32(0); /*unknown */
 295                avs->ssi_type = cpu_to_be32(3); /*2: dBm, 3: raw RSSI */
 296                avs->ssi_signal = cpu_to_be32(rssi & 0x7f);
 297                avs->ssi_noise = cpu_to_be32(priv->local_iwstatistics.qual.noise);      /*better than 'undefined', I assume */
 298                avs->preamble = cpu_to_be32(0); /*unknown */
 299                avs->encoding = cpu_to_be32(0); /*unknown */
 300        } else
 301                skb_pull(*skb, sizeof (struct rfmon_header));
 302
 303        (*skb)->protocol = htons(ETH_P_802_2);
 304        skb_reset_mac_header(*skb);
 305        (*skb)->pkt_type = PACKET_OTHERHOST;
 306
 307        return 0;
 308}
 309
 310int
 311islpci_eth_receive(islpci_private *priv)
 312{
 313        struct net_device *ndev = priv->ndev;
 314        isl38xx_control_block *control_block = priv->control_block;
 315        struct sk_buff *skb;
 316        u16 size;
 317        u32 index, offset;
 318        unsigned char *src;
 319        int discard = 0;
 320
 321#if VERBOSE > SHOW_ERROR_MESSAGES
 322        DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_receive \n");
 323#endif
 324
 325        /* the device has written an Ethernet frame in the data area
 326         * of the sk_buff without updating the structure, do it now */
 327        index = priv->free_data_rx % ISL38XX_CB_RX_QSIZE;
 328        size = le16_to_cpu(control_block->rx_data_low[index].size);
 329        skb = priv->data_low_rx[index];
 330        offset = ((unsigned long)
 331                  le32_to_cpu(control_block->rx_data_low[index].address) -
 332                  (unsigned long) skb->data) & 3;
 333
 334#if VERBOSE > SHOW_ERROR_MESSAGES
 335        DEBUG(SHOW_TRACING,
 336              "frq->addr %x skb->data %p skb->len %u offset %u truesize %u\n ",
 337              control_block->rx_data_low[priv->free_data_rx].address, skb->data,
 338              skb->len, offset, skb->truesize);
 339#endif
 340
 341        /* delete the streaming DMA mapping before processing the skb */
 342        pci_unmap_single(priv->pdev,
 343                         priv->pci_map_rx_address[index],
 344                         MAX_FRAGMENT_SIZE_RX + 2, PCI_DMA_FROMDEVICE);
 345
 346        /* update the skb structure and allign the buffer */
 347        skb_put(skb, size);
 348        if (offset) {
 349                /* shift the buffer allocation offset bytes to get the right frame */
 350                skb_pull(skb, 2);
 351                skb_put(skb, 2);
 352        }
 353#if VERBOSE > SHOW_ERROR_MESSAGES
 354        /* display the buffer contents for debugging */
 355        DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
 356        display_buffer((char *) skb->data, skb->len);
 357#endif
 358
 359        /* check whether WDS is enabled and whether the data frame is a WDS frame */
 360
 361        if (init_wds) {
 362                /* WDS enabled, check for the wds address on the first 6 bytes of the buffer */
 363                src = skb->data + 6;
 364                memmove(skb->data, src, skb->len - 6);
 365                skb_trim(skb, skb->len - 6);
 366        }
 367#if VERBOSE > SHOW_ERROR_MESSAGES
 368        DEBUG(SHOW_TRACING, "Fragment size %i in skb at %p\n", size, skb);
 369        DEBUG(SHOW_TRACING, "Skb data at %p, length %i\n", skb->data, skb->len);
 370
 371        /* display the buffer contents for debugging */
 372        DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
 373        display_buffer((char *) skb->data, skb->len);
 374#endif
 375        /* take care of monitor mode and spy monitoring. */
 376        if (unlikely(priv->iw_mode == IW_MODE_MONITOR)) {
 377                skb->dev = ndev;
 378                discard = islpci_monitor_rx(priv, &skb);
 379        } else {
 380                if (unlikely(skb->data[2 * ETH_ALEN] == 0)) {
 381                        /* The packet has a rx_annex. Read it for spy monitoring, Then
 382                         * remove it, while keeping the 2 leading MAC addr.
 383                         */
 384                        struct iw_quality wstats;
 385                        struct rx_annex_header *annex =
 386                            (struct rx_annex_header *) skb->data;
 387                        wstats.level = annex->rfmon.rssi;
 388                        /* The noise value can be a bit outdated if nobody's
 389                         * reading wireless stats... */
 390                        wstats.noise = priv->local_iwstatistics.qual.noise;
 391                        wstats.qual = wstats.level - wstats.noise;
 392                        wstats.updated = 0x07;
 393                        /* Update spy records */
 394                        wireless_spy_update(ndev, annex->addr2, &wstats);
 395
 396                        skb_copy_from_linear_data(skb,
 397                                                  (skb->data +
 398                                                   sizeof(struct rfmon_header)),
 399                                                  2 * ETH_ALEN);
 400                        skb_pull(skb, sizeof (struct rfmon_header));
 401                }
 402                skb->protocol = eth_type_trans(skb, ndev);
 403        }
 404        skb->ip_summed = CHECKSUM_NONE;
 405        ndev->stats.rx_packets++;
 406        ndev->stats.rx_bytes += size;
 407
 408        /* deliver the skb to the network layer */
 409#ifdef ISLPCI_ETH_DEBUG
 410        printk
 411            ("islpci_eth_receive:netif_rx %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
 412             skb->data[0], skb->data[1], skb->data[2], skb->data[3],
 413             skb->data[4], skb->data[5]);
 414#endif
 415        if (unlikely(discard)) {
 416                dev_kfree_skb_irq(skb);
 417                skb = NULL;
 418        } else
 419                netif_rx(skb);
 420
 421        /* increment the read index for the rx data low queue */
 422        priv->free_data_rx++;
 423
 424        /* add one or more sk_buff structures */
 425        while (index =
 426               le32_to_cpu(control_block->
 427                           driver_curr_frag[ISL38XX_CB_RX_DATA_LQ]),
 428               index - priv->free_data_rx < ISL38XX_CB_RX_QSIZE) {
 429                /* allocate an sk_buff for received data frames storage
 430                 * include any required allignment operations */
 431                skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2);
 432                if (unlikely(skb == NULL)) {
 433                        /* error allocating an sk_buff structure elements */
 434                        DEBUG(SHOW_ERROR_MESSAGES, "Error allocating skb \n");
 435                        break;
 436                }
 437                skb_reserve(skb, (4 - (long) skb->data) & 0x03);
 438                /* store the new skb structure pointer */
 439                index = index % ISL38XX_CB_RX_QSIZE;
 440                priv->data_low_rx[index] = skb;
 441
 442#if VERBOSE > SHOW_ERROR_MESSAGES
 443                DEBUG(SHOW_TRACING,
 444                      "new alloc skb %p skb->data %p skb->len %u index %u truesize %u\n ",
 445                      skb, skb->data, skb->len, index, skb->truesize);
 446#endif
 447
 448                /* set the streaming DMA mapping for proper PCI bus operation */
 449                priv->pci_map_rx_address[index] =
 450                    pci_map_single(priv->pdev, (void *) skb->data,
 451                                   MAX_FRAGMENT_SIZE_RX + 2,
 452                                   PCI_DMA_FROMDEVICE);
 453                if (unlikely(!priv->pci_map_rx_address[index])) {
 454                        /* error mapping the buffer to device accessable memory address */
 455                        DEBUG(SHOW_ERROR_MESSAGES,
 456                              "Error mapping DMA address\n");
 457
 458                        /* free the skbuf structure before aborting */
 459                        dev_kfree_skb_irq((struct sk_buff *) skb);
 460                        skb = NULL;
 461                        break;
 462                }
 463                /* update the fragment address */
 464                control_block->rx_data_low[index].address =
 465                        cpu_to_le32((u32)priv->pci_map_rx_address[index]);
 466                wmb();
 467
 468                /* increment the driver read pointer */
 469                le32_add_cpu(&control_block->
 470                             driver_curr_frag[ISL38XX_CB_RX_DATA_LQ], 1);
 471        }
 472
 473        /* trigger the device */
 474        islpci_trigger(priv);
 475
 476        return 0;
 477}
 478
 479void
 480islpci_do_reset_and_wake(struct work_struct *work)
 481{
 482        islpci_private *priv = container_of(work, islpci_private, reset_task);
 483
 484        islpci_reset(priv, 1);
 485        priv->reset_task_pending = 0;
 486        smp_wmb();
 487        netif_wake_queue(priv->ndev);
 488}
 489
 490void
 491islpci_eth_tx_timeout(struct net_device *ndev)
 492{
 493        islpci_private *priv = netdev_priv(ndev);
 494
 495        /* increment the transmit error counter */
 496        ndev->stats.tx_errors++;
 497
 498        if (!priv->reset_task_pending) {
 499                printk(KERN_WARNING
 500                        "%s: tx_timeout, scheduling reset", ndev->name);
 501                netif_stop_queue(ndev);
 502                priv->reset_task_pending = 1;
 503                schedule_work(&priv->reset_task);
 504        } else {
 505                printk(KERN_WARNING
 506                        "%s: tx_timeout, waiting for reset", ndev->name);
 507        }
 508}
 509