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        /*
  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 *buf;
 121        u8 beacon = 0;
 122        u8 is_data = 0;
 123        u8 reserved = 0, offset_to_data = 0;
 124        u16 seq_num;
 125        u32 pkt_data_len;
 126
 127        /*
 128         * In PLT mode we seem to get frames and mac80211 warns about them,
 129         * workaround this by not retrieving them at all.
 130         */
 131        if (unlikely(wl->plt))
 132                return -EINVAL;
 133
 134        pkt_data_len = wlcore_hw_get_rx_packet_len(wl, data, length);
 135        if (!pkt_data_len) {
 136                wl1271_error("Invalid packet arrived from HW. length %d",
 137                             length);
 138                return -EINVAL;
 139        }
 140
 141        if (rx_align == WLCORE_RX_BUF_UNALIGNED)
 142                reserved = RX_BUF_ALIGN;
 143        else if (rx_align == WLCORE_RX_BUF_PADDED)
 144                offset_to_data = RX_BUF_ALIGN;
 145
 146        /* the data read starts with the descriptor */
 147        desc = (struct wl1271_rx_descriptor *) data;
 148
 149        if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) {
 150                size_t len = length - sizeof(*desc);
 151                wl12xx_copy_fwlog(wl, data + sizeof(*desc), len);
 152                return 0;
 153        }
 154
 155        /* discard corrupted packets */
 156        if (desc->status & WL1271_RX_DESC_DECRYPT_FAIL) {
 157                hdr = (void *)(data + sizeof(*desc) + offset_to_data);
 158                wl1271_warning("corrupted packet in RX: status: 0x%x len: %d",
 159                               desc->status & WL1271_RX_DESC_STATUS_MASK,
 160                               pkt_data_len);
 161                wl1271_dump((DEBUG_RX|DEBUG_CMD), "PKT: ", data + sizeof(*desc),
 162                            min(pkt_data_len,
 163                                ieee80211_hdrlen(hdr->frame_control)));
 164                return -EINVAL;
 165        }
 166
 167        /* skb length not including rx descriptor */
 168        skb = __dev_alloc_skb(pkt_data_len + reserved, GFP_KERNEL);
 169        if (!skb) {
 170                wl1271_error("Couldn't allocate RX frame");
 171                return -ENOMEM;
 172        }
 173
 174        /* reserve the unaligned payload(if any) */
 175        skb_reserve(skb, reserved);
 176
 177        buf = skb_put(skb, pkt_data_len);
 178
 179        /*
 180         * Copy packets from aggregation buffer to the skbs without rx
 181         * descriptor and with packet payload aligned care. In case of unaligned
 182         * packets copy the packets in offset of 2 bytes guarantee IP header
 183         * payload aligned to 4 bytes.
 184         */
 185        memcpy(buf, data + sizeof(*desc), pkt_data_len);
 186        if (rx_align == WLCORE_RX_BUF_PADDED)
 187                skb_pull(skb, RX_BUF_ALIGN);
 188
 189        *hlid = desc->hlid;
 190
 191        hdr = (struct ieee80211_hdr *)skb->data;
 192        if (ieee80211_is_beacon(hdr->frame_control))
 193                beacon = 1;
 194        if (ieee80211_is_data_present(hdr->frame_control))
 195                is_data = 1;
 196
 197        wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon);
 198        wlcore_hw_set_rx_csum(wl, desc, skb);
 199
 200        seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4;
 201        wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb,
 202                     skb->len - desc->pad_len,
 203                     beacon ? "beacon" : "",
 204                     seq_num, *hlid);
 205
 206        skb_queue_tail(&wl->deferred_rx_queue, skb);
 207        queue_work(wl->freezable_wq, &wl->netstack_work);
 208
 209        return is_data;
 210}
 211
 212int wlcore_rx(struct wl1271 *wl, struct wl_fw_status *status)
 213{
 214        unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0};
 215        u32 buf_size;
 216        u32 fw_rx_counter = status->fw_rx_counter % wl->num_rx_desc;
 217        u32 drv_rx_counter = wl->rx_counter % wl->num_rx_desc;
 218        u32 rx_counter;
 219        u32 pkt_len, align_pkt_len;
 220        u32 pkt_offset, des;
 221        u8 hlid;
 222        enum wl_rx_buf_align rx_align;
 223        int ret = 0;
 224
 225        while (drv_rx_counter != fw_rx_counter) {
 226                buf_size = 0;
 227                rx_counter = drv_rx_counter;
 228                while (rx_counter != fw_rx_counter) {
 229                        des = le32_to_cpu(status->rx_pkt_descs[rx_counter]);
 230                        pkt_len = wlcore_rx_get_buf_size(wl, des);
 231                        align_pkt_len = wlcore_rx_get_align_buf_size(wl,
 232                                                                     pkt_len);
 233                        if (buf_size + align_pkt_len > wl->aggr_buf_size)
 234                                break;
 235                        buf_size += align_pkt_len;
 236                        rx_counter++;
 237                        rx_counter %= wl->num_rx_desc;
 238                }
 239
 240                if (buf_size == 0) {
 241                        wl1271_warning("received empty data");
 242                        break;
 243                }
 244
 245                /* Read all available packets at once */
 246                des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
 247                ret = wlcore_hw_prepare_read(wl, des, buf_size);
 248                if (ret < 0)
 249                        goto out;
 250
 251                ret = wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 252                                       buf_size, true);
 253                if (ret < 0)
 254                        goto out;
 255
 256                /* Split data into separate packets */
 257                pkt_offset = 0;
 258                while (pkt_offset < buf_size) {
 259                        des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
 260                        pkt_len = wlcore_rx_get_buf_size(wl, des);
 261                        rx_align = wlcore_hw_get_rx_buf_align(wl, des);
 262
 263                        /*
 264                         * the handle data call can only fail in memory-outage
 265                         * conditions, in that case the received frame will just
 266                         * be dropped.
 267                         */
 268                        if (wl1271_rx_handle_data(wl,
 269                                                  wl->aggr_buf + pkt_offset,
 270                                                  pkt_len, rx_align,
 271                                                  &hlid) == 1) {
 272                                if (hlid < wl->num_links)
 273                                        __set_bit(hlid, active_hlids);
 274                                else
 275                                        WARN(1,
 276                                             "hlid (%d) exceeded MAX_LINKS\n",
 277                                             hlid);
 278                        }
 279
 280                        wl->rx_counter++;
 281                        drv_rx_counter++;
 282                        drv_rx_counter %= wl->num_rx_desc;
 283                        pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len);
 284                }
 285        }
 286
 287        /*
 288         * Write the driver's packet counter to the FW. This is only required
 289         * for older hardware revisions
 290         */
 291        if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
 292                ret = wlcore_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER,
 293                                     wl->rx_counter);
 294                if (ret < 0)
 295                        goto out;
 296        }
 297
 298        wl12xx_rearm_rx_streaming(wl, active_hlids);
 299
 300out:
 301        return ret;
 302}
 303
 304#ifdef CONFIG_PM
 305int wl1271_rx_filter_enable(struct wl1271 *wl,
 306                            int index, bool enable,
 307                            struct wl12xx_rx_filter *filter)
 308{
 309        int ret;
 310
 311        if (!!test_bit(index, wl->rx_filter_enabled) == enable) {
 312                wl1271_warning("Request to enable an already "
 313                             "enabled rx filter %d", index);
 314                return 0;
 315        }
 316
 317        ret = wl1271_acx_set_rx_filter(wl, index, enable, filter);
 318
 319        if (ret) {
 320                wl1271_error("Failed to %s rx data filter %d (err=%d)",
 321                             enable ? "enable" : "disable", index, ret);
 322                return ret;
 323        }
 324
 325        if (enable)
 326                __set_bit(index, wl->rx_filter_enabled);
 327        else
 328                __clear_bit(index, wl->rx_filter_enabled);
 329
 330        return 0;
 331}
 332
 333int wl1271_rx_filter_clear_all(struct wl1271 *wl)
 334{
 335        int i, ret = 0;
 336
 337        for (i = 0; i < WL1271_MAX_RX_FILTERS; i++) {
 338                if (!test_bit(i, wl->rx_filter_enabled))
 339                        continue;
 340                ret = wl1271_rx_filter_enable(wl, i, 0, NULL);
 341                if (ret)
 342                        goto out;
 343        }
 344
 345out:
 346        return ret;
 347}
 348#endif /* CONFIG_PM */
 349