drivers/net/wireless/wl12xx/rx.c

   1 /*
   2  * This file is part of wl1271
   3  *
   4  * Copyright (C) 2009 Nokia Corporation
   5  *
   6  * Contact: Luciano Coelho <luciano.coelho@nokia.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
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * 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 St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include <linux/gfp.h>
  25 #include <linux/sched.h>
  26
  27 #include "wl12xx.h"
  28 #include "acx.h"
  29 #include "reg.h"
  30 #include "rx.h"
  31 #include "io.h"
  32
  33 static u8 wl1271_rx_get_mem_block(struct wl1271_fw_common_status *status,
  34                                   u32 drv_rx_counter)
  35 {
  36         return le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
  37                 RX_MEM_BLOCK_MASK;
  38 }
  39
  40 static u32 wl1271_rx_get_buf_size(struct wl1271_fw_common_status *status,
  41                                  u32 drv_rx_counter)
  42 {
  43         return (le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
  44                 RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
  45 }
  46
  47 static void wl1271_rx_status(struct wl1271 *wl,
  48                              struct wl1271_rx_descriptor *desc,
  49                              struct ieee80211_rx_status *status,
  50                              u8 beacon)
  51 {
  52         memset(status, 0, sizeof(struct ieee80211_rx_status));
  53
  54         if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG)
  55                 status->band = IEEE80211_BAND_2GHZ;
  56         else
  57                 status->band = IEEE80211_BAND_5GHZ;
  58
  59         status->rate_idx = wl1271_rate_to_idx(desc->rate, status->band);
  60
  61 #ifdef CONFIG_WL12XX_HT
  62         /* 11n support */
  63         if (desc->rate <= CONF_HW_RXTX_RATE_MCS0)
  64                 status->flag |= RX_FLAG_HT;
  65 #endif
  66
  67         status->signal = desc->rssi;
  68
  69         /*
  70          * FIXME: In wl1251, the SNR should be divided by two.  In wl1271 we
  71          * need to divide by two for now, but TI has been discussing about
  72          * changing it.  This needs to be rechecked.
  73          */
  74         wl->noise = desc->rssi - (desc->snr >> 1);
  75
  76         status->freq = ieee80211_channel_to_frequency(desc->channel,
  77                                                       status->band);
  78
  79         if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
  80                 u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK;
  81
  82                 status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED |
  83                                 RX_FLAG_DECRYPTED;
  84
  85                 if (unlikely(desc_err_code == WL1271_RX_DESC_MIC_FAIL)) {
  86                         status->flag |= RX_FLAG_MMIC_ERROR;
  87                         wl1271_warning("Michael MIC error");
  88                 }
  89         }
  90 }
  91
  92 static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length)
  93 {
  94         struct wl1271_rx_descriptor *desc;
  95         struct sk_buff *skb;
  96         struct ieee80211_hdr *hdr;
  97         u8 *buf;
  98         u8 beacon = 0;
  99         u8 is_data = 0;
 100
 101         /*
 102          * In PLT mode we seem to get frames and mac80211 warns about them,
 103          * workaround this by not retrieving them at all.
 104          */
 105         if (unlikely(wl->state == WL1271_STATE_PLT))
 106                 return -EINVAL;
 107
 108         /* the data read starts with the descriptor */
 109         desc = (struct wl1271_rx_descriptor *) data;
 110
 111         if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) {
 112                 size_t len = length - sizeof(*desc);
 113                 wl12xx_copy_fwlog(wl, data + sizeof(*desc), len);
 114                 wake_up_interruptible(&wl->fwlog_waitq);
 115                 return 0;
 116         }
 117
 118         switch (desc->status & WL1271_RX_DESC_STATUS_MASK) {
 119         /* discard corrupted packets */
 120         case WL1271_RX_DESC_DRIVER_RX_Q_FAIL:
 121         case WL1271_RX_DESC_DECRYPT_FAIL:
 122                 wl1271_warning("corrupted packet in RX with status: 0x%x",
 123                                desc->status & WL1271_RX_DESC_STATUS_MASK);
 124                 return -EINVAL;
 125         case WL1271_RX_DESC_SUCCESS:
 126         case WL1271_RX_DESC_MIC_FAIL:
 127                 break;
 128         default:
 129                 wl1271_error("invalid RX descriptor status: 0x%x",
 130                              desc->status & WL1271_RX_DESC_STATUS_MASK);
 131                 return -EINVAL;
 132         }
 133
 134         skb = __dev_alloc_skb(length, GFP_KERNEL);
 135         if (!skb) {
 136                 wl1271_error("Couldn't allocate RX frame");
 137                 return -ENOMEM;
 138         }
 139
 140         buf = skb_put(skb, length);
 141         memcpy(buf, data, length);
 142
 143         /* now we pull the descriptor out of the buffer */
 144         skb_pull(skb, sizeof(*desc));
 145
 146         hdr = (struct ieee80211_hdr *)skb->data;
 147         if (ieee80211_is_beacon(hdr->frame_control))
 148                 beacon = 1;
 149         if (ieee80211_is_data_present(hdr->frame_control))
 150                 is_data = 1;
 151
 152         wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon);
 153
 154         wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb,
 155                      skb->len - desc->pad_len,
 156                      beacon ? "beacon" : "");
 157
 158         skb_trim(skb, skb->len - desc->pad_len);
 159
 160         skb_queue_tail(&wl->deferred_rx_queue, skb);
 161         queue_work(wl->freezable_wq, &wl->netstack_work);
 162
 163         return is_data;
 164 }
 165
 166 void wl1271_rx(struct wl1271 *wl, struct wl1271_fw_common_status *status)
 167 {
 168         struct wl1271_acx_mem_map *wl_mem_map = wl->target_mem_map;
 169         u32 buf_size;
 170         u32 fw_rx_counter  = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
 171         u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
 172         u32 rx_counter;
 173         u32 mem_block;
 174         u32 pkt_length;
 175         u32 pkt_offset;
 176         bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
 177         bool had_data = false;
 178
 179         while (drv_rx_counter != fw_rx_counter) {
 180                 buf_size = 0;
 181                 rx_counter = drv_rx_counter;
 182                 while (rx_counter != fw_rx_counter) {
 183                         pkt_length = wl1271_rx_get_buf_size(status, rx_counter);
 184                         if (buf_size + pkt_length > WL1271_AGGR_BUFFER_SIZE)
 185                                 break;
 186                         buf_size += pkt_length;
 187                         rx_counter++;
 188                         rx_counter &= NUM_RX_PKT_DESC_MOD_MASK;
 189                 }
 190
 191                 if (buf_size == 0) {
 192                         wl1271_warning("received empty data");
 193                         break;
 194                 }
 195
 196                 if (wl->chip.id != CHIP_ID_1283_PG20) {
 197                         /*
 198                          * Choose the block we want to read
 199                          * For aggregated packets, only the first memory block
 200                          * should be retrieved. The FW takes care of the rest.
 201                          */
 202                         mem_block = wl1271_rx_get_mem_block(status,
 203                                                             drv_rx_counter);
 204
 205                         wl->rx_mem_pool_addr.addr = (mem_block << 8) +
 206                            le32_to_cpu(wl_mem_map->packet_memory_pool_start);
 207
 208                         wl->rx_mem_pool_addr.addr_extra =
 209                                 wl->rx_mem_pool_addr.addr + 4;
 210
 211                         wl1271_write(wl, WL1271_SLV_REG_DATA,
 212                                      &wl->rx_mem_pool_addr,
 213                                      sizeof(wl->rx_mem_pool_addr), false);
 214                 }
 215
 216                 /* Read all available packets at once */
 217                 wl1271_read(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
 218                                 buf_size, true);
 219
 220                 /* Split data into separate packets */
 221                 pkt_offset = 0;
 222                 while (pkt_offset < buf_size) {
 223                         pkt_length = wl1271_rx_get_buf_size(status,
 224                                         drv_rx_counter);
 225                         /*
 226                          * the handle data call can only fail in memory-outage
 227                          * conditions, in that case the received frame will just
 228                          * be dropped.
 229                          */
 230                         if (wl1271_rx_handle_data(wl,
 231                                                   wl->aggr_buf + pkt_offset,
 232                                                   pkt_length) == 1)
 233                                 had_data = true;
 234
 235                         wl->rx_counter++;
 236                         drv_rx_counter++;
 237                         drv_rx_counter &= NUM_RX_PKT_DESC_MOD_MASK;
 238                         pkt_offset += pkt_length;
 239                 }
 240         }
 241
 242         /*
 243          * Write the driver's packet counter to the FW. This is only required
 244          * for older hardware revisions
 245          */
 246         if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
 247                 wl1271_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);
 248
 249         if (!is_ap && wl->conf.rx_streaming.interval && had_data &&
 250             (wl->conf.rx_streaming.always ||
 251              test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))) {
 252                 u32 timeout = wl->conf.rx_streaming.duration;
 253
 254                 /* restart rx streaming */
 255                 if (!test_bit(WL1271_FLAG_RX_STREAMING_STARTED, &wl->flags))
 256                         ieee80211_queue_work(wl->hw,
 257                                              &wl->rx_streaming_enable_work);
 258
 259                 mod_timer(&wl->rx_streaming_timer,
 260                           jiffies + msecs_to_jiffies(timeout));
 261         }
 262 }
 263
 264 void wl1271_set_default_filters(struct wl1271 *wl)
 265 {
 266         if (wl->bss_type == BSS_TYPE_AP_BSS) {
 267                 wl->rx_config = WL1271_DEFAULT_AP_RX_CONFIG;
 268                 wl->rx_filter = WL1271_DEFAULT_AP_RX_FILTER;
 269         } else {
 270                 wl->rx_config = WL1271_DEFAULT_STA_RX_CONFIG;
 271                 wl->rx_filter = WL1271_DEFAULT_STA_RX_FILTER;
 272         }
 273 }