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