LXR linux/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
  27static 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
  37static 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
  45static 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
 103static 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
 199int 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
 294out:
 295        return ret;
 296}
 297
 298#ifdef CONFIG_PM
 299int 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
 327int 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
 339out:
 340        return ret;
 341}
 342#endif /* CONFIG_PM */
 343