drivers/net/wireless/ti/wlcore/rx.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * This file is part of wl1271
   4  *
   5  * Copyright (C) 2009 Nokia Corporation
   6  *
   7  * Contact: Luciano Coelho <luciano.coelho@nokia.com>
   8  */
   9
  10 #include <linux/gfp.h>
  11 #include <linux/sched.h>
  12
  13 #include "wlcore.h"
  14 #include "debug.h"
  15 #include "acx.h"
  16 #include "rx.h"
  17 #include "tx.h"
  18 #include "io.h"
  19 #include "hw_ops.h"
  20
  21 /*
  22  * TODO: this is here just for now, it must be removed when the data
  23  * operations are in place.
  24  */
  25 #include "../wl12xx/reg.h"
  26
  27 static u32 wlcore_rx_get_buf_size(struct wl1271 *wl,
  28                                   u32 rx_pkt_desc)
  29 {
  30         if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN)
  31                 return (rx_pkt_desc & ALIGNED_RX_BUF_SIZE_MASK) >>
  32                        ALIGNED_RX_BUF_SIZE_SHIFT;
  33
  34         return (rx_pkt_desc & RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
  35 }
  36
  37 static u32 wlcore_rx_get_align_buf_size(struct wl1271 *wl, u32 pkt_len)
  38 {
  39         if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN)
  40                 return ALIGN(pkt_len, WL12XX_BUS_BLOCK_SIZE);
  41
  42         return pkt_len;
  43 }
  44
  45 static void wl1271_rx_status(struct wl1271 *wl,
  46                              struct wl1271_rx_descriptor *desc,
  47                              struct ieee80211_rx_status *status,
  48                              u8 beacon, u8 probe_rsp)
  49 {
  50         memset(status, 0, sizeof(struct ieee80211_rx_status));
  51
  52         if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG)
  53                 status->band = NL80211_BAND_2GHZ;
  54         else
  55                 status->band = NL80211_BAND_5GHZ;
  56
  57         status->rate_idx = wlcore_rate_to_idx(wl, desc->rate, status->band);
  58
  59         /* 11n support */
  60         if (desc->rate <= wl->hw_min_ht_rate)
  61                 status->encoding = RX_ENC_HT;
  62
  63         /*
  64         * Read the signal level and antenna diversity indication.
  65         * The msb in the signal level is always set as it is a
  66         * negative number.
  67         * The antenna indication is the msb of the rssi.
  68         */
  69         status->signal = ((desc->rssi & RSSI_LEVEL_BITMASK) | BIT(7));
  70         status->antenna = ((desc->rssi & ANT_DIVERSITY_BITMASK) >> 7);
  71
  72         /*
  73          * FIXME: In wl1251, the SNR should be divided by two.  In wl1271 we
  74          * need to divide by two for now, but TI has been discussing about
  75          * changing it.  This needs to be rechecked.
  76          */
  77         wl->noise = desc->rssi - (desc->snr >> 1);
  78
  79         status->freq = ieee80211_channel_to_frequency(desc->channel,
  80                                                       status->band);
  81
  82         if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
  83                 u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK;
  84
  85                 status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED |
  86                                 RX_FLAG_DECRYPTED;
  87
  88                 if (unlikely(desc_err_code & WL1271_RX_DESC_MIC_FAIL)) {
  89                         status->flag |= RX_FLAG_MMIC_ERROR;
  90                         wl1271_warning("Michael MIC error. Desc: 0x%x",
  91                                        desc_err_code);
  92                 }
  93         }
  94
  95         if (beacon || probe_rsp)
  96                 status->boottime_ns = ktime_get_boottime_ns();
  97
  98         if (beacon)
  99                 wlcore_set_pending_regdomain_ch(wl, (u16)desc->channel,
 100                                                 status->band);
 101 }
 102
 103 static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length,
 104                                  enum wl_rx_buf_align rx_align, u8 *hlid)
 105 {
 106         struct wl1271_rx_descriptor *desc;
 107         struct sk_buff *skb;
 108         struct ieee80211_hdr *hdr;
 109         u8 beacon = 0;
 110         u8 is_data = 0;
 111         u8 reserved = 0, offset_to_data = 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         else if (rx_align == WLCORE_RX_BUF_PADDED)
 132                 offset_to_data = RX_BUF_ALIGN;
 133
 134         /* the data read starts with the descriptor */
 135         desc = (struct wl1271_rx_descriptor *) data;
 136
 137         if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) {
 138                 size_t len = length - sizeof(*desc);
 139                 wl12xx_copy_fwlog(wl, data + sizeof(*desc), len);
 140                 return 0;
 141         }
 142
 143         /* discard corrupted packets */
 144         if (desc->status & WL1271_RX_DESC_DECRYPT_FAIL) {
 145                 hdr = (void *)(data + sizeof(*desc) + offset_to_data);
 146                 wl1271_warning("corrupted packet in RX: status: 0x%x len: %d",
 147                                desc->status & WL1271_RX_DESC_STATUS_MASK,
 148                                pkt_data_len);
 149                 wl1271_dump((DEBUG_RX|DEBUG_CMD), "PKT: ", data + sizeof(*desc),
 150                             min(pkt_data_len,
 151                                 ieee80211_hdrlen(hdr->frame_control)));
 152                 return -EINVAL;
 153         }
 154
 155         /* skb length not including rx descriptor */
 156         skb = __dev_alloc_skb(pkt_data_len + reserved, GFP_KERNEL);
 157         if (!skb) {
 158                 wl1271_error("Couldn't allocate RX frame");
 159                 return -ENOMEM;
 160         }
 161
 162         /* reserve the unaligned payload(if any) */
 163         skb_reserve(skb, reserved);
 164
 165         /*
 166          * Copy packets from aggregation buffer to the skbs without rx
 167          * descriptor and with packet payload aligned care. In case of unaligned
 168          * packets copy the packets in offset of 2 bytes guarantee IP header
 169          * payload aligned to 4 bytes.
 170          */
 171         skb_put_data(skb, data + sizeof(*desc), pkt_data_len);
 172         if (rx_align == WLCORE_RX_BUF_PADDED)
 173                 skb_pull(skb, RX_BUF_ALIGN);
 174
 175         *hlid = desc->hlid;
 176
 177         hdr = (struct ieee80211_hdr *)skb->data;
 178         if (ieee80211_is_beacon(hdr->frame_control))
 179                 beacon = 1;
 180         if (ieee80211_is_data_present(hdr->frame_control))
 181                 is_data = 1;
 182
 183         wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon,
 184                          ieee80211_is_probe_resp(hdr->frame_control));
 185         wlcore_hw_set_rx_csum(wl, desc, skb);
 186
 187         seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4;
 188         wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb,
 189                      skb->len - desc->pad_len,
 190                      beacon ? "beacon" : "",
 191                      seq_num, *hlid);
 192
 193         skb_queue_tail(&wl->deferred_rx_queue, skb);
 194         queue_work(wl->freezable_wq, &wl->netstack_work);
 195
 196         return is_data;
 197 }
 198
 199 int wlcore_rx(struct wl1271 *wl, struct wl_fw_status *status)
 200 {
 201         unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0};
 202         u32 buf_size;
 203         u32 fw_rx_counter = status->fw_rx_counter % wl->num_rx_desc;
 204         u32 drv_rx_counter = wl->rx_counter % wl->num_rx_desc;
 205         u32 rx_counter;
 206         u32 pkt_len, align_pkt_len;
 207         u32 pkt_offset, des;
 208         u8 hlid;
 209         enum wl_rx_buf_align rx_align;
 210         int ret = 0;
 211
 212         /* update rates per link */
 213         hlid = status->counters.hlid;
 214
 215         if (hlid < WLCORE_MAX_LINKS)
 216                 wl->links[hlid].fw_rate_mbps =
 217                                 status->counters.tx_last_rate_mbps;
 218
 219         while (drv_rx_counter != fw_rx_counter) {
 220                 buf_size = 0;
 221                 rx_counter = drv_rx_counter;
 222                 while (rx_counter != fw_rx_counter) {
 223                         des = le32_to_cpu(status->rx_pkt_descs[rx_counter]);
 224                         pkt_len = wlcore_rx_get_buf_size(wl, des);
 225                         align_pkt_len = wlcore_rx_get_align_buf_size(wl,
 226                                                                      pkt_len);
 227                         if (buf_size + align_pkt_len > wl->aggr_buf_size)
 228                                 break;
 229                         buf_size += align_pkt_len;
 230                         rx_counter++;
 231                         rx_counter %= wl->num_rx_desc;
 232                 }
 233
 234                 if (buf_size == 0) {
 235                         wl1271_warning("received empty data");
 236                         break;
 237                 }
 238
 239                 /* Read all available packets at once */
 240                 des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
 241                 ret = wlcore_hw_prepare_read(wl, des, buf_size);
 242                 if (ret < 0)
 243                         goto out;
 244
 245                 ret = wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 246                                        buf_size, true);
 247                 if (ret < 0)
 248                         goto out;
 249
 250                 /* Split data into separate packets */
 251                 pkt_offset = 0;
 252                 while (pkt_offset < buf_size) {
 253                         des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
 254                         pkt_len = wlcore_rx_get_buf_size(wl, des);
 255                         rx_align = wlcore_hw_get_rx_buf_align(wl, des);
 256
 257                         /*
 258                          * the handle data call can only fail in memory-outage
 259                          * conditions, in that case the received frame will just
 260                          * be dropped.
 261                          */
 262                         if (wl1271_rx_handle_data(wl,
 263                                                   wl->aggr_buf + pkt_offset,
 264                                                   pkt_len, rx_align,
 265                                                   &hlid) == 1) {
 266                                 if (hlid < wl->num_links)
 267                                         __set_bit(hlid, active_hlids);
 268                                 else
 269                                         WARN(1,
 270                                              "hlid (%d) exceeded MAX_LINKS\n",
 271                                              hlid);
 272                         }
 273
 274                         wl->rx_counter++;
 275                         drv_rx_counter++;
 276                         drv_rx_counter %= wl->num_rx_desc;
 277                         pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len);
 278                 }
 279         }
 280
 281         /*
 282          * Write the driver's packet counter to the FW. This is only required
 283          * for older hardware revisions
 284          */
 285         if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
 286                 ret = wlcore_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER,
 287                                      wl->rx_counter);
 288                 if (ret < 0)
 289                         goto out;
 290         }
 291
 292         wl12xx_rearm_rx_streaming(wl, active_hlids);
 293
 294 out:
 295         return ret;
 296 }
 297
 298 #ifdef CONFIG_PM
 299 int wl1271_rx_filter_enable(struct wl1271 *wl,
 300                             int index, bool enable,
 301                             struct wl12xx_rx_filter *filter)
 302 {
 303         int ret;
 304
 305         if (!!test_bit(index, wl->rx_filter_enabled) == enable) {
 306                 wl1271_warning("Request to enable an already "
 307                              "enabled rx filter %d", index);
 308                 return 0;
 309         }
 310
 311         ret = wl1271_acx_set_rx_filter(wl, index, enable, filter);
 312
 313         if (ret) {
 314                 wl1271_error("Failed to %s rx data filter %d (err=%d)",
 315                              enable ? "enable" : "disable", index, ret);
 316                 return ret;
 317         }
 318
 319         if (enable)
 320                 __set_bit(index, wl->rx_filter_enabled);
 321         else
 322                 __clear_bit(index, wl->rx_filter_enabled);
 323
 324         return 0;
 325 }
 326
 327 int wl1271_rx_filter_clear_all(struct wl1271 *wl)
 328 {
 329         int i, ret = 0;
 330
 331         for (i = 0; i < WL1271_MAX_RX_FILTERS; i++) {
 332                 if (!test_bit(i, wl->rx_filter_enabled))
 333                         continue;
 334                 ret = wl1271_rx_filter_enable(wl, i, 0, NULL);
 335                 if (ret)
 336                         goto out;
 337         }
 338
 339 out:
 340         return ret;
 341 }
 342 #endif /* CONFIG_PM */