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