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
  41 static 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
  51 static 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
  59 static 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
 114 static 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
 212 int 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         /* update rates per link */
 226         hlid = status->counters.hlid;
 227
 228         if (hlid < WLCORE_MAX_LINKS)
 229                 wl->links[hlid].fw_rate_mbps =
 230                                 status->counters.tx_last_rate_mbps;
 231
 232         while (drv_rx_counter != fw_rx_counter) {
 233                 buf_size = 0;
 234                 rx_counter = drv_rx_counter;
 235                 while (rx_counter != fw_rx_counter) {
 236                         des = le32_to_cpu(status->rx_pkt_descs[rx_counter]);
 237                         pkt_len = wlcore_rx_get_buf_size(wl, des);
 238                         align_pkt_len = wlcore_rx_get_align_buf_size(wl,
 239                                                                      pkt_len);
 240                         if (buf_size + align_pkt_len > wl->aggr_buf_size)
 241                                 break;
 242                         buf_size += align_pkt_len;
 243                         rx_counter++;
 244                         rx_counter %= wl->num_rx_desc;
 245                 }
 246
 247                 if (buf_size == 0) {
 248                         wl1271_warning("received empty data");
 249                         break;
 250                 }
 251
 252                 /* Read all available packets at once */
 253                 des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
 254                 ret = wlcore_hw_prepare_read(wl, des, buf_size);
 255                 if (ret < 0)
 256                         goto out;
 257
 258                 ret = wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 259                                        buf_size, true);
 260                 if (ret < 0)
 261                         goto out;
 262
 263                 /* Split data into separate packets */
 264                 pkt_offset = 0;
 265                 while (pkt_offset < buf_size) {
 266                         des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
 267                         pkt_len = wlcore_rx_get_buf_size(wl, des);
 268                         rx_align = wlcore_hw_get_rx_buf_align(wl, des);
 269
 270                         /*
 271                          * the handle data call can only fail in memory-outage
 272                          * conditions, in that case the received frame will just
 273                          * be dropped.
 274                          */
 275                         if (wl1271_rx_handle_data(wl,
 276                                                   wl->aggr_buf + pkt_offset,
 277                                                   pkt_len, rx_align,
 278                                                   &hlid) == 1) {
 279                                 if (hlid < wl->num_links)
 280                                         __set_bit(hlid, active_hlids);
 281                                 else
 282                                         WARN(1,
 283                                              "hlid (%d) exceeded MAX_LINKS\n",
 284                                              hlid);
 285                         }
 286
 287                         wl->rx_counter++;
 288                         drv_rx_counter++;
 289                         drv_rx_counter %= wl->num_rx_desc;
 290                         pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len);
 291                 }
 292         }
 293
 294         /*
 295          * Write the driver's packet counter to the FW. This is only required
 296          * for older hardware revisions
 297          */
 298         if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
 299                 ret = wlcore_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER,
 300                                      wl->rx_counter);
 301                 if (ret < 0)
 302                         goto out;
 303         }
 304
 305         wl12xx_rearm_rx_streaming(wl, active_hlids);
 306
 307 out:
 308         return ret;
 309 }
 310
 311 #ifdef CONFIG_PM
 312 int wl1271_rx_filter_enable(struct wl1271 *wl,
 313                             int index, bool enable,
 314                             struct wl12xx_rx_filter *filter)
 315 {
 316         int ret;
 317
 318         if (!!test_bit(index, wl->rx_filter_enabled) == enable) {
 319                 wl1271_warning("Request to enable an already "
 320                              "enabled rx filter %d", index);
 321                 return 0;
 322         }
 323
 324         ret = wl1271_acx_set_rx_filter(wl, index, enable, filter);
 325
 326         if (ret) {
 327                 wl1271_error("Failed to %s rx data filter %d (err=%d)",
 328                              enable ? "enable" : "disable", index, ret);
 329                 return ret;
 330         }
 331
 332         if (enable)
 333                 __set_bit(index, wl->rx_filter_enabled);
 334         else
 335                 __clear_bit(index, wl->rx_filter_enabled);
 336
 337         return 0;
 338 }
 339
 340 int wl1271_rx_filter_clear_all(struct wl1271 *wl)
 341 {
 342         int i, ret = 0;
 343
 344         for (i = 0; i < WL1271_MAX_RX_FILTERS; i++) {
 345                 if (!test_bit(i, wl->rx_filter_enabled))
 346                         continue;
 347                 ret = wl1271_rx_filter_enable(wl, i, 0, NULL);
 348                 if (ret)
 349                         goto out;
 350         }
 351
 352 out:
 353         return ret;
 354 }
 355 #endif /* CONFIG_PM */