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