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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  Copyright (C) 2002 Intersil Americas Inc.
   4 *  Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
   5 */
   6
   7#include <linux/module.h>
   8#include <linux/gfp.h>
   9
  10#include <linux/pci.h>
  11#include <linux/delay.h>
  12#include <linux/netdevice.h>
  13#include <linux/etherdevice.h>
  14#include <linux/if_arp.h>
  15#include <asm/byteorder.h>
  16
  17#include "prismcompat.h"
  18#include "isl_38xx.h"
  19#include "islpci_eth.h"
  20#include "islpci_mgt.h"
  21#include "oid_mgt.h"
  22
  23/******************************************************************************
  24    Network Interface functions
  25******************************************************************************/
  26void
  27islpci_eth_cleanup_transmit(islpci_private *priv,
  28                            isl38xx_control_block *control_block)
  29{
  30        struct sk_buff *skb;
  31        u32 index;
  32
  33        /* compare the control block read pointer with the free pointer */
  34        while (priv->free_data_tx !=
  35               le32_to_cpu(control_block->
  36                           device_curr_frag[ISL38XX_CB_TX_DATA_LQ])) {
  37                /* read the index of the first fragment to be freed */
  38                index = priv->free_data_tx % ISL38XX_CB_TX_QSIZE;
  39
  40                /* check for holes in the arrays caused by multi fragment frames
  41                 * searching for the last fragment of a frame */
  42                if (priv->pci_map_tx_address[index]) {
  43                        /* entry is the last fragment of a frame
  44                         * free the skb structure and unmap pci memory */
  45                        skb = priv->data_low_tx[index];
  46
  47#if VERBOSE > SHOW_ERROR_MESSAGES
  48                        DEBUG(SHOW_TRACING,
  49                              "cleanup skb %p skb->data %p skb->len %u truesize %u\n",
  50                              skb, skb->data, skb->len, skb->truesize);
  51#endif
  52
  53                        dma_unmap_single(&priv->pdev->dev,
  54                                         priv->pci_map_tx_address[index],
  55                                         skb->len, DMA_TO_DEVICE);
  56                        dev_kfree_skb_irq(skb);
  57                        skb = NULL;
  58                }
  59                /* increment the free data low queue pointer */
  60                priv->free_data_tx++;
  61        }
  62}
  63
  64netdev_tx_t
  65islpci_eth_transmit(struct sk_buff *skb, struct net_device *ndev)
  66{
  67        islpci_private *priv = netdev_priv(ndev);
  68        isl38xx_control_block *cb = priv->control_block;
  69        u32 index;
  70        dma_addr_t pci_map_address;
  71        int frame_size;
  72        isl38xx_fragment *fragment;
  73        int offset;
  74        struct sk_buff *newskb;
  75        int newskb_offset;
  76        unsigned long flags;
  77        unsigned char wds_mac[6];
  78        u32 curr_frag;
  79
  80#if VERBOSE > SHOW_ERROR_MESSAGES
  81        DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_transmit\n");
  82#endif
  83
  84        /* lock the driver code */
  85        spin_lock_irqsave(&priv->slock, flags);
  86
  87        /* check whether the destination queue has enough fragments for the frame */
  88        curr_frag = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ]);
  89        if (unlikely(curr_frag - priv->free_data_tx >= ISL38XX_CB_TX_QSIZE)) {
  90                printk(KERN_ERR "%s: transmit device queue full when awake\n",
  91                       ndev->name);
  92                netif_stop_queue(ndev);
  93
  94                /* trigger the device */
  95                isl38xx_w32_flush(priv->device_base, ISL38XX_DEV_INT_UPDATE,
  96                                  ISL38XX_DEV_INT_REG);
  97                udelay(ISL38XX_WRITEIO_DELAY);
  98                goto drop_free;
  99        }
 100        /* Check alignment and WDS frame formatting. The start of the packet should
 101         * be aligned on a 4-byte boundary. If WDS is enabled add another 6 bytes
 102         * and add WDS address information */
 103        if (likely(((long) skb->data & 0x03) | init_wds)) {
 104                /* get the number of bytes to add and re-align */
 105                offset = (4 - (long) skb->data) & 0x03;
 106                offset += init_wds ? 6 : 0;
 107
 108                /* check whether the current skb can be used  */
 109                if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
 110                        unsigned char *src = skb->data;
 111
 112#if VERBOSE > SHOW_ERROR_MESSAGES
 113                        DEBUG(SHOW_TRACING, "skb offset %i wds %i\n", offset,
 114                              init_wds);
 115#endif
 116
 117                        /* align the buffer on 4-byte boundary */
 118                        skb_reserve(skb, (4 - (long) skb->data) & 0x03);
 119                        if (init_wds) {
 120                                /* wds requires an additional address field of 6 bytes */
 121                                skb_put(skb, 6);
 122#ifdef ISLPCI_ETH_DEBUG
 123                                printk("islpci_eth_transmit:wds_mac\n");
 124#endif
 125                                memmove(skb->data + 6, src, skb->len);
 126                                skb_copy_to_linear_data(skb, wds_mac, 6);
 127                        } else {
 128                                memmove(skb->data, src, skb->len);
 129                        }
 130
 131#if VERBOSE > SHOW_ERROR_MESSAGES
 132                        DEBUG(SHOW_TRACING, "memmove %p %p %i\n", skb->data,
 133                              src, skb->len);
 134#endif
 135                } else {
 136                        newskb =
 137                            dev_alloc_skb(init_wds ? skb->len + 6 : skb->len);
 138                        if (unlikely(newskb == NULL)) {
 139                                printk(KERN_ERR "%s: Cannot allocate skb\n",
 140                                       ndev->name);
 141                                goto drop_free;
 142                        }
 143                        newskb_offset = (4 - (long) newskb->data) & 0x03;
 144
 145                        /* Check if newskb->data is aligned */
 146                        if (newskb_offset)
 147                                skb_reserve(newskb, newskb_offset);
 148
 149                        skb_put(newskb, init_wds ? skb->len + 6 : skb->len);
 150                        if (init_wds) {
 151                                skb_copy_from_linear_data(skb,
 152                                                          newskb->data + 6,
 153                                                          skb->len);
 154                                skb_copy_to_linear_data(newskb, wds_mac, 6);
 155#ifdef ISLPCI_ETH_DEBUG
 156                                printk("islpci_eth_transmit:wds_mac\n");
 157#endif
 158                        } else
 159                                skb_copy_from_linear_data(skb, newskb->data,
 160                                                          skb->len);
 161
 162#if VERBOSE > SHOW_ERROR_MESSAGES
 163                        DEBUG(SHOW_TRACING, "memcpy %p %p %i wds %i\n",
 164                              newskb->data, skb->data, skb->len, init_wds);
 165#endif
 166
 167                        newskb->dev = skb->dev;
 168                        dev_kfree_skb_irq(skb);
 169                        skb = newskb;
 170                }
 171        }
 172        /* display the buffer contents for debugging */
 173#if VERBOSE > SHOW_ERROR_MESSAGES
 174        DEBUG(SHOW_BUFFER_CONTENTS, "\ntx %p ", skb->data);
 175        display_buffer((char *) skb->data, skb->len);
 176#endif
 177
 178        /* map the skb buffer to pci memory for DMA operation */
 179        pci_map_address = dma_map_single(&priv->pdev->dev, (void *)skb->data,
 180                                         skb->len, DMA_TO_DEVICE);
 181        if (dma_mapping_error(&priv->pdev->dev, pci_map_address)) {
 182                printk(KERN_WARNING "%s: cannot map buffer to PCI\n",
 183                       ndev->name);
 184                goto drop_free;
 185        }
 186        /* Place the fragment in the control block structure. */
 187        index = curr_frag % ISL38XX_CB_TX_QSIZE;
 188        fragment = &cb->tx_data_low[index];
 189
 190        priv->pci_map_tx_address[index] = pci_map_address;
 191        /* store the skb address for future freeing  */
 192        priv->data_low_tx[index] = skb;
 193        /* set the proper fragment start address and size information */
 194        frame_size = skb->len;
 195        fragment->size = cpu_to_le16(frame_size);
 196        fragment->flags = cpu_to_le16(0);       /* set to 1 if more fragments */
 197        fragment->address = cpu_to_le32(pci_map_address);
 198        curr_frag++;
 199
 200        /* The fragment address in the control block must have been
 201         * written before announcing the frame buffer to device. */
 202        wmb();
 203        cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ] = cpu_to_le32(curr_frag);
 204
 205        if (curr_frag - priv->free_data_tx + ISL38XX_MIN_QTHRESHOLD
 206            > ISL38XX_CB_TX_QSIZE) {
 207                /* stop sends from upper layers */
 208                netif_stop_queue(ndev);
 209
 210                /* set the full flag for the transmission queue */
 211                priv->data_low_tx_full = 1;
 212        }
 213
 214        ndev->stats.tx_packets++;
 215        ndev->stats.tx_bytes += skb->len;
 216
 217        /* trigger the device */
 218        islpci_trigger(priv);
 219
 220        /* unlock the driver code */
 221        spin_unlock_irqrestore(&priv->slock, flags);
 222
 223        return NETDEV_TX_OK;
 224
 225      drop_free:
 226        ndev->stats.tx_dropped++;
 227        spin_unlock_irqrestore(&priv->slock, flags);
 228        dev_kfree_skb(skb);
 229        return NETDEV_TX_OK;
 230}
 231
 232static inline int
 233islpci_monitor_rx(islpci_private *priv, struct sk_buff **skb)
 234{
 235        /* The card reports full 802.11 packets but with a 20 bytes
 236         * header and without the FCS. But there a is a bit that
 237         * indicates if the packet is corrupted :-) */
 238        struct rfmon_header *hdr = (struct rfmon_header *) (*skb)->data;
 239
 240        if (hdr->flags & 0x01)
 241                /* This one is bad. Drop it ! */
 242                return -1;
 243        if (priv->ndev->type == ARPHRD_IEEE80211_PRISM) {
 244                struct avs_80211_1_header *avs;
 245                /* extract the relevant data from the header */
 246                u32 clock = le32_to_cpu(hdr->clock);
 247                u8 rate = hdr->rate;
 248                u16 freq = le16_to_cpu(hdr->freq);
 249                u8 rssi = hdr->rssi;
 250
 251                skb_pull(*skb, sizeof (struct rfmon_header));
 252
 253                if (skb_headroom(*skb) < sizeof (struct avs_80211_1_header)) {
 254                        struct sk_buff *newskb = skb_copy_expand(*skb,
 255                                                                 sizeof (struct
 256                                                                         avs_80211_1_header),
 257                                                                 0, GFP_ATOMIC);
 258                        if (newskb) {
 259                                dev_kfree_skb_irq(*skb);
 260                                *skb = newskb;
 261                        } else
 262                                return -1;
 263                        /* This behavior is not very subtile... */
 264                }
 265
 266                /* make room for the new header and fill it. */
 267                avs = skb_push(*skb, sizeof(struct avs_80211_1_header));
 268
 269                avs->version = cpu_to_be32(P80211CAPTURE_VERSION);
 270                avs->length = cpu_to_be32(sizeof (struct avs_80211_1_header));
 271                avs->mactime = cpu_to_be64(clock);
 272                avs->hosttime = cpu_to_be64(jiffies);
 273                avs->phytype = cpu_to_be32(6);  /*OFDM: 6 for (g), 8 for (a) */
 274                avs->channel = cpu_to_be32(channel_of_freq(freq));
 275                avs->datarate = cpu_to_be32(rate * 5);
 276                avs->antenna = cpu_to_be32(0);  /*unknown */
 277                avs->priority = cpu_to_be32(0); /*unknown */
 278                avs->ssi_type = cpu_to_be32(3); /*2: dBm, 3: raw RSSI */
 279                avs->ssi_signal = cpu_to_be32(rssi & 0x7f);
 280                avs->ssi_noise = cpu_to_be32(priv->local_iwstatistics.qual.noise);      /*better than 'undefined', I assume */
 281                avs->preamble = cpu_to_be32(0); /*unknown */
 282                avs->encoding = cpu_to_be32(0); /*unknown */
 283        } else
 284                skb_pull(*skb, sizeof (struct rfmon_header));
 285
 286        (*skb)->protocol = htons(ETH_P_802_2);
 287        skb_reset_mac_header(*skb);
 288        (*skb)->pkt_type = PACKET_OTHERHOST;
 289
 290        return 0;
 291}
 292
 293int
 294islpci_eth_receive(islpci_private *priv)
 295{
 296        struct net_device *ndev = priv->ndev;
 297        isl38xx_control_block *control_block = priv->control_block;
 298        struct sk_buff *skb;
 299        u16 size;
 300        u32 index, offset;
 301        unsigned char *src;
 302        int discard = 0;
 303
 304#if VERBOSE > SHOW_ERROR_MESSAGES
 305        DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_receive\n");
 306#endif
 307
 308        /* the device has written an Ethernet frame in the data area
 309         * of the sk_buff without updating the structure, do it now */
 310        index = priv->free_data_rx % ISL38XX_CB_RX_QSIZE;
 311        size = le16_to_cpu(control_block->rx_data_low[index].size);
 312        skb = priv->data_low_rx[index];
 313        offset = ((unsigned long)
 314                  le32_to_cpu(control_block->rx_data_low[index].address) -
 315                  (unsigned long) skb->data) & 3;
 316
 317#if VERBOSE > SHOW_ERROR_MESSAGES
 318        DEBUG(SHOW_TRACING,
 319              "frq->addr %x skb->data %p skb->len %u offset %u truesize %u\n",
 320              control_block->rx_data_low[priv->free_data_rx].address, skb->data,
 321              skb->len, offset, skb->truesize);
 322#endif
 323
 324        /* delete the streaming DMA mapping before processing the skb */
 325        dma_unmap_single(&priv->pdev->dev, priv->pci_map_rx_address[index],
 326                         MAX_FRAGMENT_SIZE_RX + 2, DMA_FROM_DEVICE);
 327
 328        /* update the skb structure and align the buffer */
 329        skb_put(skb, size);
 330        if (offset) {
 331                /* shift the buffer allocation offset bytes to get the right frame */
 332                skb_pull(skb, 2);
 333                skb_put(skb, 2);
 334        }
 335#if VERBOSE > SHOW_ERROR_MESSAGES
 336        /* display the buffer contents for debugging */
 337        DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
 338        display_buffer((char *) skb->data, skb->len);
 339#endif
 340
 341        /* check whether WDS is enabled and whether the data frame is a WDS frame */
 342
 343        if (init_wds) {
 344                /* WDS enabled, check for the wds address on the first 6 bytes of the buffer */
 345                src = skb->data + 6;
 346                memmove(skb->data, src, skb->len - 6);
 347                skb_trim(skb, skb->len - 6);
 348        }
 349#if VERBOSE > SHOW_ERROR_MESSAGES
 350        DEBUG(SHOW_TRACING, "Fragment size %i in skb at %p\n", size, skb);
 351        DEBUG(SHOW_TRACING, "Skb data at %p, length %i\n", skb->data, skb->len);
 352
 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        /* take care of monitor mode and spy monitoring. */
 358        if (unlikely(priv->iw_mode == IW_MODE_MONITOR)) {
 359                skb->dev = ndev;
 360                discard = islpci_monitor_rx(priv, &skb);
 361        } else {
 362                if (unlikely(skb->data[2 * ETH_ALEN] == 0)) {
 363                        /* The packet has a rx_annex. Read it for spy monitoring, Then
 364                         * remove it, while keeping the 2 leading MAC addr.
 365                         */
 366                        struct iw_quality wstats;
 367                        struct rx_annex_header *annex =
 368                            (struct rx_annex_header *) skb->data;
 369                        wstats.level = annex->rfmon.rssi;
 370                        /* The noise value can be a bit outdated if nobody's
 371                         * reading wireless stats... */
 372                        wstats.noise = priv->local_iwstatistics.qual.noise;
 373                        wstats.qual = wstats.level - wstats.noise;
 374                        wstats.updated = 0x07;
 375                        /* Update spy records */
 376                        wireless_spy_update(ndev, annex->addr2, &wstats);
 377
 378                        skb_copy_from_linear_data(skb,
 379                                                  (skb->data +
 380                                                   sizeof(struct rfmon_header)),
 381                                                  2 * ETH_ALEN);
 382                        skb_pull(skb, sizeof (struct rfmon_header));
 383                }
 384                skb->protocol = eth_type_trans(skb, ndev);
 385        }
 386        skb->ip_summed = CHECKSUM_NONE;
 387        ndev->stats.rx_packets++;
 388        ndev->stats.rx_bytes += size;
 389
 390        /* deliver the skb to the network layer */
 391#ifdef ISLPCI_ETH_DEBUG
 392        printk
 393            ("islpci_eth_receive:netif_rx %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
 394             skb->data[0], skb->data[1], skb->data[2], skb->data[3],
 395             skb->data[4], skb->data[5]);
 396#endif
 397        if (unlikely(discard)) {
 398                dev_kfree_skb_irq(skb);
 399                skb = NULL;
 400        } else
 401                netif_rx(skb);
 402
 403        /* increment the read index for the rx data low queue */
 404        priv->free_data_rx++;
 405
 406        /* add one or more sk_buff structures */
 407        while (index =
 408               le32_to_cpu(control_block->
 409                           driver_curr_frag[ISL38XX_CB_RX_DATA_LQ]),
 410               index - priv->free_data_rx < ISL38XX_CB_RX_QSIZE) {
 411                /* allocate an sk_buff for received data frames storage
 412                 * include any required allignment operations */
 413                skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2);
 414                if (unlikely(skb == NULL)) {
 415                        /* error allocating an sk_buff structure elements */
 416                        DEBUG(SHOW_ERROR_MESSAGES, "Error allocating skb\n");
 417                        break;
 418                }
 419                skb_reserve(skb, (4 - (long) skb->data) & 0x03);
 420                /* store the new skb structure pointer */
 421                index = index % ISL38XX_CB_RX_QSIZE;
 422                priv->data_low_rx[index] = skb;
 423
 424#if VERBOSE > SHOW_ERROR_MESSAGES
 425                DEBUG(SHOW_TRACING,
 426                      "new alloc skb %p skb->data %p skb->len %u index %u truesize %u\n",
 427                      skb, skb->data, skb->len, index, skb->truesize);
 428#endif
 429
 430                /* set the streaming DMA mapping for proper PCI bus operation */
 431                priv->pci_map_rx_address[index] =
 432                    dma_map_single(&priv->pdev->dev, (void *)skb->data,
 433                                   MAX_FRAGMENT_SIZE_RX + 2, DMA_FROM_DEVICE);
 434                if (dma_mapping_error(&priv->pdev->dev, priv->pci_map_rx_address[index])) {
 435                        /* error mapping the buffer to device accessible memory address */
 436                        DEBUG(SHOW_ERROR_MESSAGES,
 437                              "Error mapping DMA address\n");
 438
 439                        /* free the skbuf structure before aborting */
 440                        dev_kfree_skb_irq(skb);
 441                        skb = NULL;
 442                        break;
 443                }
 444                /* update the fragment address */
 445                control_block->rx_data_low[index].address =
 446                        cpu_to_le32((u32)priv->pci_map_rx_address[index]);
 447                wmb();
 448
 449                /* increment the driver read pointer */
 450                le32_add_cpu(&control_block->
 451                             driver_curr_frag[ISL38XX_CB_RX_DATA_LQ], 1);
 452        }
 453
 454        /* trigger the device */
 455        islpci_trigger(priv);
 456
 457        return 0;
 458}
 459
 460void
 461islpci_do_reset_and_wake(struct work_struct *work)
 462{
 463        islpci_private *priv = container_of(work, islpci_private, reset_task);
 464
 465        islpci_reset(priv, 1);
 466        priv->reset_task_pending = 0;
 467        smp_wmb();
 468        netif_wake_queue(priv->ndev);
 469}
 470
 471void
 472islpci_eth_tx_timeout(struct net_device *ndev, unsigned int txqueue)
 473{
 474        islpci_private *priv = netdev_priv(ndev);
 475
 476        /* increment the transmit error counter */
 477        ndev->stats.tx_errors++;
 478
 479        if (!priv->reset_task_pending) {
 480                printk(KERN_WARNING
 481                        "%s: tx_timeout, scheduling reset", ndev->name);
 482                netif_stop_queue(ndev);
 483                priv->reset_task_pending = 1;
 484                schedule_work(&priv->reset_task);
 485        } else {
 486                printk(KERN_WARNING
 487                        "%s: tx_timeout, waiting for reset", ndev->name);
 488        }
 489}
 490