r92c_rx.c

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    1 /*      $OpenBSD: if_urtwn.c,v 1.16 2011/02/10 17:26:40 jakemsr Exp $   */
    2 
    3 /*-
    4  * Copyright (c) 2010 Damien Bergamini <damien.bergamini@free.fr>
    5  * Copyright (c) 2014 Kevin Lo <kevlo@FreeBSD.org>
    6  * Copyright (c) 2015-2016 Andriy Voskoboinyk <avos@FreeBSD.org>
    7  *
    8  * Permission to use, copy, modify, and distribute this software for any
    9  * purpose with or without fee is hereby granted, provided that the above
   10  * copyright notice and this permission notice appear in all copies.
   11  *
   12  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   13  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   14  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   15  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   16  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   17  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   18  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   19  */
   20 
   21 #include <sys/cdefs.h>
   22 __FBSDID("$FreeBSD$");
   23 
   24 #include "opt_wlan.h"
   25 
   26 #include <sys/param.h>
   27 #include <sys/lock.h>
   28 #include <sys/mutex.h>
   29 #include <sys/mbuf.h>
   30 #include <sys/kernel.h>
   31 #include <sys/socket.h>
   32 #include <sys/systm.h>
   33 #include <sys/malloc.h>
   34 #include <sys/queue.h>
   35 #include <sys/taskqueue.h>
   36 #include <sys/bus.h>
   37 #include <sys/endian.h>
   38 #include <sys/linker.h>
   39 
   40 #include <net/if.h>
   41 #include <net/ethernet.h>
   42 #include <net/if_media.h>
   43 
   44 #include <net80211/ieee80211_var.h>
   45 #include <net80211/ieee80211_radiotap.h>
   46 
   47 #include <dev/rtwn/if_rtwnreg.h>
   48 #include <dev/rtwn/if_rtwnvar.h>
   49 #include <dev/rtwn/if_rtwn_ridx.h>
   50 
   51 #include <dev/rtwn/rtl8192c/r92c.h>
   52 #include <dev/rtwn/rtl8192c/r92c_rx_desc.h>
   53 
   54 int
   55 r92c_classify_intr(struct rtwn_softc *sc, void *buf, int len)
   56 {
   57         /* NB: reports are fetched from C2H_MSG register. */
   58         return (RTWN_RX_DATA);
   59 }
   60 
   61 int8_t
   62 r92c_get_rssi_cck(struct rtwn_softc *sc, void *physt)
   63 {
   64         static const int8_t cckoff[] = { 16, -12, -26, -46 };
   65         struct r92c_rx_cck *cck = (struct r92c_rx_cck *)physt;
   66         uint8_t rpt;
   67         int8_t rssi;
   68 
   69         if (sc->sc_flags & RTWN_FLAG_CCK_HIPWR) {
   70                 rpt = (cck->agc_rpt >> 5) & 0x03;
   71                 rssi = (cck->agc_rpt & 0x1f) << 1;
   72         } else {
   73                 rpt = (cck->agc_rpt >> 6) & 0x03;
   74                 rssi = cck->agc_rpt & 0x3e;
   75         }
   76         rssi = cckoff[rpt] - rssi;
   77 
   78         return (rssi);
   79 }
   80 
   81 int8_t
   82 r92c_get_rssi_ofdm(struct rtwn_softc *sc, void *physt)
   83 {
   84         struct r92c_rx_phystat *phy = (struct r92c_rx_phystat *)physt;
   85         int rssi;
   86 
   87         /* Get average RSSI. */
   88         rssi = ((phy->pwdb_all >> 1) & 0x7f) - 110;
   89 
   90         return (rssi);
   91 }
   92 
   93 uint8_t
   94 r92c_rx_radiotap_flags(const void *buf)
   95 {
   96         const struct r92c_rx_stat *stat = buf;
   97         uint8_t flags, rate;
   98 
   99         if (!(stat->rxdw3 & htole32(R92C_RXDW3_SPLCP)))
  100                 return (0);
  101 
  102         rate = MS(le32toh(stat->rxdw3), R92C_RXDW3_RATE);
  103         if (RTWN_RATE_IS_CCK(rate))
  104                 flags = IEEE80211_RADIOTAP_F_SHORTPRE;
  105         else
  106                 flags = IEEE80211_RADIOTAP_F_SHORTGI;
  107         return (flags);
  108 }
  109 
  110 void
  111 r92c_get_rx_stats(struct rtwn_softc *sc, struct ieee80211_rx_stats *rxs,
  112     const void *desc, const void *physt_ptr)
  113 {
  114         const struct r92c_rx_stat *stat = desc;
  115         uint32_t rxdw1, rxdw3;
  116         uint8_t rate;
  117 
  118         rxdw1 = le32toh(stat->rxdw1);
  119         rxdw3 = le32toh(stat->rxdw3);
  120         rate = MS(rxdw3, R92C_RXDW3_RATE);
  121 
  122         if (rxdw1 & R92C_RXDW1_AMPDU)
  123                 rxs->c_pktflags |= IEEE80211_RX_F_AMPDU;
  124         else if (rxdw1 & R92C_RXDW1_AMPDU_MORE)
  125                 rxs->c_pktflags |= IEEE80211_RX_F_AMPDU_MORE;
  126         if ((rxdw3 & R92C_RXDW3_SPLCP) && rate >= RTWN_RIDX_HT_MCS(0))
  127                 rxs->c_pktflags |= IEEE80211_RX_F_SHORTGI;
  128 
  129         if (rxdw3 & R92C_RXDW3_HT40)
  130                 rxs->c_width = IEEE80211_RX_FW_40MHZ;
  131         else
  132                 rxs->c_width = IEEE80211_RX_FW_20MHZ;
  133 
  134         if (RTWN_RATE_IS_CCK(rate))
  135                 rxs->c_phytype = IEEE80211_RX_FP_11B;
  136         else if (rate < RTWN_RIDX_HT_MCS(0))
  137                 rxs->c_phytype = IEEE80211_RX_FP_11G;
  138         else
  139                 rxs->c_phytype = IEEE80211_RX_FP_11NG;
  140 
  141         /* Map HW rate index to 802.11 rate. */
  142         if (rate < RTWN_RIDX_HT_MCS(0)) {
  143                 rxs->c_rate = ridx2rate[rate];
  144                 if (RTWN_RATE_IS_CCK(rate))
  145                         rxs->c_pktflags |= IEEE80211_RX_F_CCK;
  146                 else
  147                         rxs->c_pktflags |= IEEE80211_RX_F_OFDM;
  148         } else {        /* MCS0~15. */
  149                 rxs->c_rate =
  150                     IEEE80211_RATE_MCS | (rate - RTWN_RIDX_HT_MCS_SHIFT);
  151                 rxs->c_pktflags |= IEEE80211_RX_F_HT;
  152         }
  153 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/rtwn/rtl8192c/r92c_rx.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/rtwn/rtl8192c/r92c_rx.c