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 = NL80211_BAND_2GHZ;
  68        else
  69                status->band = NL80211_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->encoding = RX_ENC_HT;
  76
  77        /*
  78        * Read the signal level and antenna diversity indication.
  79        * The msb in the signal level is always set as it is a
  80        * negative number.
  81        * The antenna indication is the msb of the rssi.
  82        */
  83        status->signal = ((desc->rssi & RSSI_LEVEL_BITMASK) | BIT(7));
  84        status->antenna = ((desc->rssi & ANT_DIVERSITY_BITMASK) >> 7);
  85
  86        /*
  87         * FIXME: In wl1251, the SNR should be divided by two.  In wl1271 we
  88         * need to divide by two for now, but TI has been discussing about
  89         * changing it.  This needs to be rechecked.
  90         */
  91        wl->noise = desc->rssi - (desc->snr >> 1);
  92
  93        status->freq = ieee80211_channel_to_frequency(desc->channel,
  94                                                      status->band);
  95
  96        if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
  97                u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK;
  98
  99                status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED |
 100                                RX_FLAG_DECRYPTED;
 101
 102                if (unlikely(desc_err_code & WL1271_RX_DESC_MIC_FAIL)) {
 103                        status->flag |= RX_FLAG_MMIC_ERROR;
 104                        wl1271_warning("Michael MIC error. Desc: 0x%x",
 105                                       desc_err_code);
 106                }
 107        }
 108
 109        if (beacon)
 110                wlcore_set_pending_regdomain_ch(wl, (u16)desc->channel,
 111                                                status->band);
 112}
 113
 114static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length,
 115                                 enum wl_rx_buf_align rx_align, u8 *hlid)
 116{
 117        struct wl1271_rx_descriptor *desc;
 118        struct sk_buff *skb;
 119        struct ieee80211_hdr *hdr;
 120        u8 beacon = 0;
 121        u8 is_data = 0;
 122        u8 reserved = 0, offset_to_data = 0;
 123        u16 seq_num;
 124        u32 pkt_data_len;
 125
 126        /*
 127         * In PLT mode we seem to get frames and mac80211 warns about them,
 128         * workaround this by not retrieving them at all.
 129         */
 130        if (unlikely(wl->plt))
 131                return -EINVAL;
 132
 133        pkt_data_len = wlcore_hw_get_rx_packet_len(wl, data, length);
 134        if (!pkt_data_len) {
 135                wl1271_error("Invalid packet arrived from HW. length %d",
 136                             length);
 137                return -EINVAL;
 138        }
 139
 140        if (rx_align == WLCORE_RX_BUF_UNALIGNED)
 141                reserved = RX_BUF_ALIGN;
 142        else if (rx_align == WLCORE_RX_BUF_PADDED)
 143                offset_to_data = RX_BUF_ALIGN;
 144
 145        /* the data read starts with the descriptor */
 146        desc = (struct wl1271_rx_descriptor *) data;
 147
 148        if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) {
 149                size_t len = length - sizeof(*desc);
 150                wl12xx_copy_fwlog(wl, data + sizeof(*desc), len);
 151                return 0;
 152        }
 153
 154        /* discard corrupted packets */
 155        if (desc->status & WL1271_RX_DESC_DECRYPT_FAIL) {
 156                hdr = (void *)(data + sizeof(*desc) + offset_to_data);
 157                wl1271_warning("corrupted packet in RX: status: 0x%x len: %d",
 158                               desc->status & WL1271_RX_DESC_STATUS_MASK,
 159                               pkt_data_len);
 160                wl1271_dump((DEBUG_RX|DEBUG_CMD), "PKT: ", data + sizeof(*desc),
 161                            min(pkt_data_len,
 162                                ieee80211_hdrlen(hdr->frame_control)));
 163                return -EINVAL;
 164        }
 165
 166        /* skb length not including rx descriptor */
 167        skb = __dev_alloc_skb(pkt_data_len + reserved, GFP_KERNEL);
 168        if (!skb) {
 169                wl1271_error("Couldn't allocate RX frame");
 170                return -ENOMEM;
 171        }
 172
 173        /* reserve the unaligned payload(if any) */
 174        skb_reserve(skb, reserved);
 175
 176        /*
 177         * Copy packets from aggregation buffer to the skbs without rx
 178         * descriptor and with packet payload aligned care. In case of unaligned
 179         * packets copy the packets in offset of 2 bytes guarantee IP header
 180         * payload aligned to 4 bytes.
 181         */
 182        skb_put_data(skb, data + sizeof(*desc), pkt_data_len);
 183        if (rx_align == WLCORE_RX_BUF_PADDED)
 184                skb_pull(skb, RX_BUF_ALIGN);
 185
 186        *hlid = desc->hlid;
 187
 188        hdr = (struct ieee80211_hdr *)skb->data;
 189        if (ieee80211_is_beacon(hdr->frame_control))
 190                beacon = 1;
 191        if (ieee80211_is_data_present(hdr->frame_control))
 192                is_data = 1;
 193
 194        wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon);
 195        wlcore_hw_set_rx_csum(wl, desc, skb);
 196
 197        seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4;
 198        wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb,
 199                     skb->len - desc->pad_len,
 200                     beacon ? "beacon" : "",
 201                     seq_num, *hlid);
 202
 203        skb_queue_tail(&wl->deferred_rx_queue, skb);
 204        queue_work(wl->freezable_wq, &wl->netstack_work);
 205
 206        return is_data;
 207}
 208
 209int wlcore_rx(struct wl1271 *wl, struct wl_fw_status *status)
 210{
 211        unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0};
 212        u32 buf_size;
 213        u32 fw_rx_counter = status->fw_rx_counter % wl->num_rx_desc;
 214        u32 drv_rx_counter = wl->rx_counter % wl->num_rx_desc;
 215        u32 rx_counter;
 216        u32 pkt_len, align_pkt_len;
 217        u32 pkt_offset, des;
 218        u8 hlid;
 219        enum wl_rx_buf_align rx_align;
 220        int ret = 0;
 221
 222        /* update rates per link */
 223        hlid = status->counters.hlid;
 224
 225        if (hlid < WLCORE_MAX_LINKS)
 226                wl->links[hlid].fw_rate_mbps =
 227                                status->counters.tx_last_rate_mbps;
 228
 229        while (drv_rx_counter != fw_rx_counter) {
 230                buf_size = 0;
 231                rx_counter = drv_rx_counter;
 232                while (rx_counter != fw_rx_counter) {
 233                        des = le32_to_cpu(status->rx_pkt_descs[rx_counter]);
 234                        pkt_len = wlcore_rx_get_buf_size(wl, des);
 235                        align_pkt_len = wlcore_rx_get_align_buf_size(wl,
 236                                                                     pkt_len);
 237                        if (buf_size + align_pkt_len > wl->aggr_buf_size)
 238                                break;
 239                        buf_size += align_pkt_len;
 240                        rx_counter++;
 241                        rx_counter %= wl->num_rx_desc;
 242                }
 243
 244                if (buf_size == 0) {
 245                        wl1271_warning("received empty data");
 246                        break;
 247                }
 248
 249                /* Read all available packets at once */
 250                des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
 251                ret = wlcore_hw_prepare_read(wl, des, buf_size);
 252                if (ret < 0)
 253                        goto out;
 254
 255                ret = wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 256                                       buf_size, true);
 257                if (ret < 0)
 258                        goto out;
 259
 260                /* Split data into separate packets */
 261                pkt_offset = 0;
 262                while (pkt_offset < buf_size) {
 263                        des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
 264                        pkt_len = wlcore_rx_get_buf_size(wl, des);
 265                        rx_align = wlcore_hw_get_rx_buf_align(wl, des);
 266
 267                        /*
 268                         * the handle data call can only fail in memory-outage
 269                         * conditions, in that case the received frame will just
 270                         * be dropped.
 271                         */
 272                        if (wl1271_rx_handle_data(wl,
 273                                                  wl->aggr_buf + pkt_offset,
 274                                                  pkt_len, rx_align,
 275                                                  &hlid) == 1) {
 276                                if (hlid < wl->num_links)
 277                                        __set_bit(hlid, active_hlids);
 278                                else
 279                                        WARN(1,
 280                                             "hlid (%d) exceeded MAX_LINKS\n",
 281                                             hlid);
 282                        }
 283
 284                        wl->rx_counter++;
 285                        drv_rx_counter++;
 286                        drv_rx_counter %= wl->num_rx_desc;
 287                        pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len);
 288                }
 289        }
 290
 291        /*
 292         * Write the driver's packet counter to the FW. This is only required
 293         * for older hardware revisions
 294         */
 295        if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
 296                ret = wlcore_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER,
 297                                     wl->rx_counter);
 298                if (ret < 0)
 299                        goto out;
 300        }
 301
 302        wl12xx_rearm_rx_streaming(wl, active_hlids);
 303
 304out:
 305        return ret;
 306}
 307
 308#ifdef CONFIG_PM
 309int wl1271_rx_filter_enable(struct wl1271 *wl,
 310                            int index, bool enable,
 311                            struct wl12xx_rx_filter *filter)
 312{
 313        int ret;
 314
 315        if (!!test_bit(index, wl->rx_filter_enabled) == enable) {
 316                wl1271_warning("Request to enable an already "
 317                             "enabled rx filter %d", index);
 318                return 0;
 319        }
 320
 321        ret = wl1271_acx_set_rx_filter(wl, index, enable, filter);
 322
 323        if (ret) {
 324                wl1271_error("Failed to %s rx data filter %d (err=%d)",
 325                             enable ? "enable" : "disable", index, ret);
 326                return ret;
 327        }
 328
 329        if (enable)
 330                __set_bit(index, wl->rx_filter_enabled);
 331        else
 332                __clear_bit(index, wl->rx_filter_enabled);
 333
 334        return 0;
 335}
 336
 337int wl1271_rx_filter_clear_all(struct wl1271 *wl)
 338{
 339        int i, ret = 0;
 340
 341        for (i = 0; i < WL1271_MAX_RX_FILTERS; i++) {
 342                if (!test_bit(i, wl->rx_filter_enabled))
 343                        continue;
 344                ret = wl1271_rx_filter_enable(wl, i, 0, NULL);
 345                if (ret)
 346                        goto out;
 347        }
 348
 349out:
 350        return ret;
 351}
 352#endif /* CONFIG_PM */
 353