LXR linux/drivers/net/wireless/ti/wlcore/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 "wlcore.h"
  28#include "debug.h"
  29#include "acx.h"
  30#include "rx.h"
  31#include "tx.h"
  32#include "io.h"
  33#include "hw_ops.h"
  34
  35/*
  36 * TODO: this is here just for now, it must be removed when the data
  37 * operations are in place.
  38 */
  39#include "../wl12xx/reg.h"
  40
  41static u32 wlcore_rx_get_buf_size(struct wl1271 *wl,
  42                                  u32 rx_pkt_desc)
  43{
  44        if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN)
  45                return (rx_pkt_desc & ALIGNED_RX_BUF_SIZE_MASK) >>
  46                       ALIGNED_RX_BUF_SIZE_SHIFT;
  47
  48        return (rx_pkt_desc & RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
  49}
  50
  51static u32 wlcore_rx_get_align_buf_size(struct wl1271 *wl, u32 pkt_len)
  52{
  53        if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN)
  54                return ALIGN(pkt_len, WL12XX_BUS_BLOCK_SIZE);
  55
  56        return pkt_len;
  57}
  58
  59static void wl1271_rx_status(struct wl1271 *wl,
  60                             struct wl1271_rx_descriptor *desc,
  61                             struct ieee80211_rx_status *status,
  62                             u8 beacon)
  63{
  64        memset(status, 0, sizeof(struct ieee80211_rx_status));
  65
  66        if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG)
  67                status->band = IEEE80211_BAND_2GHZ;
  68        else
  69                status->band = IEEE80211_BAND_5GHZ;
  70
  71        status->rate_idx = wlcore_rate_to_idx(wl, desc->rate, status->band);
  72
  73        /* 11n support */
  74        if (desc->rate <= wl->hw_min_ht_rate)
  75                status->flag |= RX_FLAG_HT;
  76
  77        status->signal = desc->rssi;
  78
  79        /*
  80         * FIXME: In wl1251, the SNR should be divided by two.  In wl1271 we
  81         * need to divide by two for now, but TI has been discussing about
  82         * changing it.  This needs to be rechecked.
  83         */
  84        wl->noise = desc->rssi - (desc->snr >> 1);
  85
  86        status->freq = ieee80211_channel_to_frequency(desc->channel,
  87                                                      status->band);
  88
  89        if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
  90                u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK;
  91
  92                status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED |
  93                                RX_FLAG_DECRYPTED;
  94
  95                if (unlikely(desc_err_code == WL1271_RX_DESC_MIC_FAIL)) {
  96                        status->flag |= RX_FLAG_MMIC_ERROR;
  97                        wl1271_warning("Michael MIC error");
  98                }
  99        }
 100}
 101
 102static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length,
 103                                 enum wl_rx_buf_align rx_align, u8 *hlid)
 104{
 105        struct wl1271_rx_descriptor *desc;
 106        struct sk_buff *skb;
 107        struct ieee80211_hdr *hdr;
 108        u8 *buf;
 109        u8 beacon = 0;
 110        u8 is_data = 0;
 111        u8 reserved = 0;
 112        u16 seq_num;
 113        u32 pkt_data_len;
 114
 115        /*
 116         * In PLT mode we seem to get frames and mac80211 warns about them,
 117         * workaround this by not retrieving them at all.
 118         */
 119        if (unlikely(wl->plt))
 120                return -EINVAL;
 121
 122        pkt_data_len = wlcore_hw_get_rx_packet_len(wl, data, length);
 123        if (!pkt_data_len) {
 124                wl1271_error("Invalid packet arrived from HW. length %d",
 125                             length);
 126                return -EINVAL;
 127        }
 128
 129        if (rx_align == WLCORE_RX_BUF_UNALIGNED)
 130                reserved = RX_BUF_ALIGN;
 131
 132        /* the data read starts with the descriptor */
 133        desc = (struct wl1271_rx_descriptor *) data;
 134
 135        if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) {
 136                size_t len = length - sizeof(*desc);
 137                wl12xx_copy_fwlog(wl, data + sizeof(*desc), len);
 138                wake_up_interruptible(&wl->fwlog_waitq);
 139                return 0;
 140        }
 141
 142        switch (desc->status & WL1271_RX_DESC_STATUS_MASK) {
 143        /* discard corrupted packets */
 144        case WL1271_RX_DESC_DRIVER_RX_Q_FAIL:
 145        case WL1271_RX_DESC_DECRYPT_FAIL:
 146                wl1271_warning("corrupted packet in RX with status: 0x%x",
 147                               desc->status & WL1271_RX_DESC_STATUS_MASK);
 148                return -EINVAL;
 149        case WL1271_RX_DESC_SUCCESS:
 150        case WL1271_RX_DESC_MIC_FAIL:
 151                break;
 152        default:
 153                wl1271_error("invalid RX descriptor status: 0x%x",
 154                             desc->status & WL1271_RX_DESC_STATUS_MASK);
 155                return -EINVAL;
 156        }
 157
 158        /* skb length not including rx descriptor */
 159        skb = __dev_alloc_skb(pkt_data_len + reserved, GFP_KERNEL);
 160        if (!skb) {
 161                wl1271_error("Couldn't allocate RX frame");
 162                return -ENOMEM;
 163        }
 164
 165        /* reserve the unaligned payload(if any) */
 166        skb_reserve(skb, reserved);
 167
 168        buf = skb_put(skb, pkt_data_len);
 169
 170        /*
 171         * Copy packets from aggregation buffer to the skbs without rx
 172         * descriptor and with packet payload aligned care. In case of unaligned
 173         * packets copy the packets in offset of 2 bytes guarantee IP header
 174         * payload aligned to 4 bytes.
 175         */
 176        memcpy(buf, data + sizeof(*desc), pkt_data_len);
 177        if (rx_align == WLCORE_RX_BUF_PADDED)
 178                skb_pull(skb, RX_BUF_ALIGN);
 179
 180        *hlid = desc->hlid;
 181
 182        hdr = (struct ieee80211_hdr *)skb->data;
 183        if (ieee80211_is_beacon(hdr->frame_control))
 184                beacon = 1;
 185        if (ieee80211_is_data_present(hdr->frame_control))
 186                is_data = 1;
 187
 188        wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon);
 189        wlcore_hw_set_rx_csum(wl, desc, skb);
 190
 191        seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4;
 192        wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb,
 193                     skb->len - desc->pad_len,
 194                     beacon ? "beacon" : "",
 195                     seq_num, *hlid);
 196
 197        skb_queue_tail(&wl->deferred_rx_queue, skb);
 198        queue_work(wl->freezable_wq, &wl->netstack_work);
 199
 200        return is_data;
 201}
 202
 203int wlcore_rx(struct wl1271 *wl, struct wl_fw_status_1 *status)
 204{
 205        unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0};
 206        u32 buf_size;
 207        u32 fw_rx_counter = status->fw_rx_counter % wl->num_rx_desc;
 208        u32 drv_rx_counter = wl->rx_counter % wl->num_rx_desc;
 209        u32 rx_counter;
 210        u32 pkt_len, align_pkt_len;
 211        u32 pkt_offset, des;
 212        u8 hlid;
 213        enum wl_rx_buf_align rx_align;
 214        int ret = 0;
 215
 216        while (drv_rx_counter != fw_rx_counter) {
 217                buf_size = 0;
 218                rx_counter = drv_rx_counter;
 219                while (rx_counter != fw_rx_counter) {
 220                        des = le32_to_cpu(status->rx_pkt_descs[rx_counter]);
 221                        pkt_len = wlcore_rx_get_buf_size(wl, des);
 222                        align_pkt_len = wlcore_rx_get_align_buf_size(wl,
 223                                                                     pkt_len);
 224                        if (buf_size + align_pkt_len > WL1271_AGGR_BUFFER_SIZE)
 225                                break;
 226                        buf_size += align_pkt_len;
 227                        rx_counter++;
 228                        rx_counter %= wl->num_rx_desc;
 229                }
 230
 231                if (buf_size == 0) {
 232                        wl1271_warning("received empty data");
 233                        break;
 234                }
 235
 236                /* Read all available packets at once */
 237                des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
 238                ret = wlcore_hw_prepare_read(wl, des, buf_size);
 239                if (ret < 0)
 240                        goto out;
 241
 242                ret = wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 243                                       buf_size, true);
 244                if (ret < 0)
 245                        goto out;
 246
 247                /* Split data into separate packets */
 248                pkt_offset = 0;
 249                while (pkt_offset < buf_size) {
 250                        des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
 251                        pkt_len = wlcore_rx_get_buf_size(wl, des);
 252                        rx_align = wlcore_hw_get_rx_buf_align(wl, des);
 253
 254                        /*
 255                         * the handle data call can only fail in memory-outage
 256                         * conditions, in that case the received frame will just
 257                         * be dropped.
 258                         */
 259                        if (wl1271_rx_handle_data(wl,
 260                                                  wl->aggr_buf + pkt_offset,
 261                                                  pkt_len, rx_align,
 262                                                  &hlid) == 1) {
 263                                if (hlid < WL12XX_MAX_LINKS)
 264                                        __set_bit(hlid, active_hlids);
 265                                else
 266                                        WARN(1,
 267                                             "hlid exceeded WL12XX_MAX_LINKS "
 268                                             "(%d)\n", hlid);
 269                        }
 270
 271                        wl->rx_counter++;
 272                        drv_rx_counter++;
 273                        drv_rx_counter %= wl->num_rx_desc;
 274                        pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len);
 275                }
 276        }
 277
 278        /*
 279         * Write the driver's packet counter to the FW. This is only required
 280         * for older hardware revisions
 281         */
 282        if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
 283                ret = wlcore_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER,
 284                                     wl->rx_counter);
 285                if (ret < 0)
 286                        goto out;
 287        }
 288
 289        wl12xx_rearm_rx_streaming(wl, active_hlids);
 290
 291out:
 292        return ret;
 293}
 294
 295#ifdef CONFIG_PM
 296int wl1271_rx_filter_enable(struct wl1271 *wl,
 297                            int index, bool enable,
 298                            struct wl12xx_rx_filter *filter)
 299{
 300        int ret;
 301
 302        if (wl->rx_filter_enabled[index] == enable) {
 303                wl1271_warning("Request to enable an already "
 304                             "enabled rx filter %d", index);
 305                return 0;
 306        }
 307
 308        ret = wl1271_acx_set_rx_filter(wl, index, enable, filter);
 309
 310        if (ret) {
 311                wl1271_error("Failed to %s rx data filter %d (err=%d)",
 312                             enable ? "enable" : "disable", index, ret);
 313                return ret;
 314        }
 315
 316        wl->rx_filter_enabled[index] = enable;
 317
 318        return 0;
 319}
 320
 321int wl1271_rx_filter_clear_all(struct wl1271 *wl)
 322{
 323        int i, ret = 0;
 324
 325        for (i = 0; i < WL1271_MAX_RX_FILTERS; i++) {
 326                if (!wl->rx_filter_enabled[i])
 327                        continue;
 328                ret = wl1271_rx_filter_enable(wl, i, 0, NULL);
 329                if (ret)
 330                        goto out;
 331        }
 332
 333out:
 334        return ret;
 335}
 336#endif /* CONFIG_PM */
 337