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freebsd-skq/sys/dev/rtwn/rtl8812a/r12a_tx.c
avos 9260667a71 rtwn(4): clear 'basic' rate bit before calculating RTS/CTS rate. 
Rate tables have this bit set to indicate minimal set of basic rates;
however, it overlappes with MCS bit, so rate2ridx() will treat them as
an 11n rate.

Due to the current rates setup the issue can be reproduced only
in 5GHz band with 11n / protection enabled.

Tested with RTL8821AU, HOSTAP mode.

MFC after:	5 days
2019-01-16 12:11:29 +00:00

447 lines
12 KiB
C
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/*-
* Copyright (c) 2016 Andriy Voskoboinyk <avos@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_wlan.h"
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/taskqueue.h>
#include <sys/bus.h>
#include <sys/endian.h>
#include <sys/linker.h>
#include <net/if.h>
#include <net/ethernet.h>
#include <net/if_media.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_radiotap.h>
#include <dev/rtwn/if_rtwnreg.h>
#include <dev/rtwn/if_rtwnvar.h>
#include <dev/rtwn/if_rtwn_ridx.h>
#include <dev/rtwn/rtl8812a/r12a.h>
#include <dev/rtwn/rtl8812a/r12a_tx_desc.h>
static int
r12a_get_primary_channel(struct rtwn_softc *sc, struct ieee80211_channel *c)
{
/* XXX 80 MHz */
if (IEEE80211_IS_CHAN_HT40U(c))
return (R12A_TXDW5_PRIM_CHAN_20_80_2);
else
return (R12A_TXDW5_PRIM_CHAN_20_80_3);
}
static void
r12a_tx_set_ht40(struct rtwn_softc *sc, void *buf, struct ieee80211_node *ni)
{
struct r12a_tx_desc *txd = (struct r12a_tx_desc *)buf;
/* XXX 80 Mhz */
if (ni->ni_chan != IEEE80211_CHAN_ANYC &&
IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
int prim_chan;
prim_chan = r12a_get_primary_channel(sc, ni->ni_chan);
txd->txdw5 |= htole32(SM(R12A_TXDW5_DATA_BW,
R12A_TXDW5_DATA_BW40));
txd->txdw5 |= htole32(SM(R12A_TXDW5_DATA_PRIM_CHAN,
prim_chan));
}
}
static void
r12a_tx_protection(struct rtwn_softc *sc, struct r12a_tx_desc *txd,
enum ieee80211_protmode mode, uint8_t ridx)
{
struct ieee80211com *ic = &sc->sc_ic;
uint8_t rate;
switch (mode) {
case IEEE80211_PROT_CTSONLY:
txd->txdw3 |= htole32(R12A_TXDW3_CTS2SELF);
break;
case IEEE80211_PROT_RTSCTS:
txd->txdw3 |= htole32(R12A_TXDW3_RTSEN);
break;
default:
break;
}
if (mode == IEEE80211_PROT_CTSONLY ||
mode == IEEE80211_PROT_RTSCTS) {
if (ridx >= RTWN_RIDX_HT_MCS(0))
rate = rtwn_ctl_mcsrate(ic->ic_rt, ridx);
else
rate = ieee80211_ctl_rate(ic->ic_rt, ridx2rate[ridx]);
ridx = rate2ridx(IEEE80211_RV(rate));
txd->txdw4 |= htole32(SM(R12A_TXDW4_RTSRATE, ridx));
/* RTS rate fallback limit (max). */
txd->txdw4 |= htole32(SM(R12A_TXDW4_RTSRATE_FB_LMT, 0xf));
if (RTWN_RATE_IS_CCK(ridx) && ridx != RTWN_RIDX_CCK1 &&
(ic->ic_flags & IEEE80211_F_SHPREAMBLE))
txd->txdw5 |= htole32(R12A_TXDW5_RTS_SHORT);
}
}
static void
r12a_tx_raid(struct rtwn_softc *sc, struct r12a_tx_desc *txd,
struct ieee80211_node *ni, int ismcast)
{
struct ieee80211com *ic = &sc->sc_ic;
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_channel *chan;
enum ieee80211_phymode mode;
uint8_t raid;
chan = (ni->ni_chan != IEEE80211_CHAN_ANYC) ?
ni->ni_chan : ic->ic_curchan;
mode = ieee80211_chan2mode(chan);
/* NB: group addressed frames are done at 11bg rates for now */
if (ismcast || !(ni->ni_flags & IEEE80211_NODE_HT)) {
switch (mode) {
case IEEE80211_MODE_11A:
case IEEE80211_MODE_11B:
case IEEE80211_MODE_11G:
break;
case IEEE80211_MODE_11NA:
mode = IEEE80211_MODE_11A;
break;
case IEEE80211_MODE_11NG:
mode = IEEE80211_MODE_11G;
break;
default:
device_printf(sc->sc_dev, "unknown mode(1) %d!\n",
ic->ic_curmode);
return;
}
}
switch (mode) {
case IEEE80211_MODE_11A:
raid = R12A_RAID_11G;
break;
case IEEE80211_MODE_11B:
raid = R12A_RAID_11B;
break;
case IEEE80211_MODE_11G:
if (vap->iv_flags & IEEE80211_F_PUREG)
raid = R12A_RAID_11G;
else
raid = R12A_RAID_11BG;
break;
case IEEE80211_MODE_11NA:
if (sc->ntxchains == 1)
raid = R12A_RAID_11GN_1;
else
raid = R12A_RAID_11GN_2;
break;
case IEEE80211_MODE_11NG:
if (sc->ntxchains == 1) {
if (IEEE80211_IS_CHAN_HT40(chan))
raid = R12A_RAID_11BGN_1_40;
else
raid = R12A_RAID_11BGN_1;
} else {
if (IEEE80211_IS_CHAN_HT40(chan))
raid = R12A_RAID_11BGN_2_40;
else
raid = R12A_RAID_11BGN_2;
}
break;
default:
/* TODO: 80 MHz / 11ac */
device_printf(sc->sc_dev, "unknown mode(2) %d!\n", mode);
return;
}
txd->txdw1 |= htole32(SM(R12A_TXDW1_RAID, raid));
}
static void
r12a_tx_set_sgi(struct rtwn_softc *sc, void *buf, struct ieee80211_node *ni)
{
struct r12a_tx_desc *txd = (struct r12a_tx_desc *)buf;
struct ieee80211vap *vap = ni->ni_vap;
if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) && /* HT20 */
(ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20))
txd->txdw5 |= htole32(R12A_TXDW5_DATA_SHORT);
else if (ni->ni_chan != IEEE80211_CHAN_ANYC && /* HT40 */
IEEE80211_IS_CHAN_HT40(ni->ni_chan) &&
(ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) &&
(vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40))
txd->txdw5 |= htole32(R12A_TXDW5_DATA_SHORT);
}
static void
r12a_tx_set_ldpc(struct rtwn_softc *sc, struct r12a_tx_desc *txd,
struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
if ((vap->iv_flags_ht & IEEE80211_FHT_LDPC_TX) &&
(ni->ni_htcap & IEEE80211_HTCAP_LDPC))
txd->txdw5 |= htole32(R12A_TXDW5_DATA_LDPC);
}
void
r12a_fill_tx_desc(struct rtwn_softc *sc, struct ieee80211_node *ni,
struct mbuf *m, void *buf, uint8_t ridx, int maxretry)
{
struct ieee80211com *ic = &sc->sc_ic;
struct ieee80211vap *vap = ni->ni_vap;
struct rtwn_vap *uvp = RTWN_VAP(vap);
struct ieee80211_frame *wh;
struct r12a_tx_desc *txd;
enum ieee80211_protmode prot;
uint8_t type, tid, qos, qsel;
int hasqos, ismcast, macid;
wh = mtod(m, struct ieee80211_frame *);
type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
hasqos = IEEE80211_QOS_HAS_SEQ(wh);
ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
/* Select TX ring for this frame. */
if (hasqos) {
qos = ((const struct ieee80211_qosframe *)wh)->i_qos[0];
tid = qos & IEEE80211_QOS_TID;
} else {
qos = 0;
tid = 0;
}
/* Fill Tx descriptor. */
txd = (struct r12a_tx_desc *)buf;
txd->flags0 |= R12A_FLAGS0_LSG | R12A_FLAGS0_FSG;
if (ismcast)
txd->flags0 |= R12A_FLAGS0_BMCAST;
if (!ismcast) {
/* Unicast frame, check if an ACK is expected. */
if (!qos || (qos & IEEE80211_QOS_ACKPOLICY) !=
IEEE80211_QOS_ACKPOLICY_NOACK) {
txd->txdw4 = htole32(R12A_TXDW4_RETRY_LMT_ENA);
txd->txdw4 |= htole32(SM(R12A_TXDW4_RETRY_LMT,
maxretry));
}
struct rtwn_node *un = RTWN_NODE(ni);
macid = un->id;
if (type == IEEE80211_FC0_TYPE_DATA) {
qsel = tid % RTWN_MAX_TID;
if (m->m_flags & M_AMPDU_MPDU) {
txd->txdw2 |= htole32(R12A_TXDW2_AGGEN);
txd->txdw2 |= htole32(SM(R12A_TXDW2_AMPDU_DEN,
vap->iv_ampdu_density));
txd->txdw3 |= htole32(SM(R12A_TXDW3_MAX_AGG,
0x1f)); /* XXX */
} else
txd->txdw2 |= htole32(R12A_TXDW2_AGGBK);
if (sc->sc_ratectl == RTWN_RATECTL_NET80211) {
txd->txdw2 |= htole32(R12A_TXDW2_SPE_RPT);
sc->sc_tx_n_active++;
}
if (RTWN_RATE_IS_CCK(ridx) && ridx != RTWN_RIDX_CCK1 &&
(ic->ic_flags & IEEE80211_F_SHPREAMBLE))
txd->txdw5 |= htole32(R12A_TXDW5_DATA_SHORT);
prot = IEEE80211_PROT_NONE;
if (ridx >= RTWN_RIDX_HT_MCS(0)) {
r12a_tx_set_ht40(sc, txd, ni);
r12a_tx_set_sgi(sc, txd, ni);
r12a_tx_set_ldpc(sc, txd, ni);
prot = ic->ic_htprotmode;
} else if (ic->ic_flags & IEEE80211_F_USEPROT)
prot = ic->ic_protmode;
/* XXX fix last comparison for A-MSDU (in net80211) */
/* XXX A-MPDU? */
if (m->m_pkthdr.len + IEEE80211_CRC_LEN >
vap->iv_rtsthreshold &&
vap->iv_rtsthreshold != IEEE80211_RTS_MAX)
prot = IEEE80211_PROT_RTSCTS;
if (prot != IEEE80211_PROT_NONE)
r12a_tx_protection(sc, txd, prot, ridx);
} else /* IEEE80211_FC0_TYPE_MGT */
qsel = R12A_TXDW1_QSEL_MGNT;
} else {
macid = RTWN_MACID_BC;
qsel = R12A_TXDW1_QSEL_MGNT;
}
txd->txdw1 |= htole32(SM(R12A_TXDW1_QSEL, qsel));
txd->txdw1 |= htole32(SM(R12A_TXDW1_MACID, macid));
txd->txdw4 |= htole32(SM(R12A_TXDW4_DATARATE, ridx));
/* Data rate fallback limit (max). */
txd->txdw4 |= htole32(SM(R12A_TXDW4_DATARATE_FB_LMT, 0x1f));
/* XXX recheck for non-21au */
txd->txdw6 |= htole32(SM(R21A_TXDW6_MBSSID, uvp->id));
r12a_tx_raid(sc, txd, ni, ismcast);
/* Force this rate if needed. */
if (sc->sc_ratectl != RTWN_RATECTL_FW)
txd->txdw3 |= htole32(R12A_TXDW3_DRVRATE);
if (!hasqos) {
/* Use HW sequence numbering for non-QoS frames. */
txd->txdw8 |= htole32(R12A_TXDW8_HWSEQ_EN);
txd->txdw3 |= htole32(SM(R12A_TXDW3_SEQ_SEL, uvp->id));
} else {
uint16_t seqno;
if (m->m_flags & M_AMPDU_MPDU) {
seqno = ni->ni_txseqs[tid];
ni->ni_txseqs[tid]++;
} else
seqno = M_SEQNO_GET(m) % IEEE80211_SEQ_RANGE;
/* Set sequence number. */
txd->txdw9 |= htole32(SM(R12A_TXDW9_SEQ, seqno));
}
}
void
r12a_fill_tx_desc_raw(struct rtwn_softc *sc, struct ieee80211_node *ni,
struct mbuf *m, void *buf, const struct ieee80211_bpf_params *params)
{
struct ieee80211vap *vap = ni->ni_vap;
struct rtwn_vap *uvp = RTWN_VAP(vap);
struct ieee80211_frame *wh;
struct r12a_tx_desc *txd;
uint8_t ridx;
int ismcast;
/* XXX TODO: 11n checks, matching rtwn_fill_tx_desc() */
wh = mtod(m, struct ieee80211_frame *);
ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
ridx = rate2ridx(params->ibp_rate0);
/* Fill Tx descriptor. */
txd = (struct r12a_tx_desc *)buf;
txd->flags0 |= R12A_FLAGS0_LSG | R12A_FLAGS0_FSG;
if (ismcast)
txd->flags0 |= R12A_FLAGS0_BMCAST;
if ((params->ibp_flags & IEEE80211_BPF_NOACK) == 0) {
txd->txdw4 = htole32(R12A_TXDW4_RETRY_LMT_ENA);
txd->txdw4 |= htole32(SM(R12A_TXDW4_RETRY_LMT,
params->ibp_try0));
}
if (params->ibp_flags & IEEE80211_BPF_RTS)
r12a_tx_protection(sc, txd, IEEE80211_PROT_RTSCTS, ridx);
if (params->ibp_flags & IEEE80211_BPF_CTS)
r12a_tx_protection(sc, txd, IEEE80211_PROT_CTSONLY, ridx);
txd->txdw1 |= htole32(SM(R12A_TXDW1_MACID, RTWN_MACID_BC));
txd->txdw1 |= htole32(SM(R12A_TXDW1_QSEL, R12A_TXDW1_QSEL_MGNT));
/* Set TX rate index. */
txd->txdw4 |= htole32(SM(R12A_TXDW4_DATARATE, ridx));
txd->txdw4 |= htole32(SM(R12A_TXDW4_DATARATE_FB_LMT, 0x1f));
txd->txdw6 |= htole32(SM(R21A_TXDW6_MBSSID, uvp->id));
txd->txdw3 |= htole32(R12A_TXDW3_DRVRATE);
r12a_tx_raid(sc, txd, ni, ismcast);
if (!IEEE80211_QOS_HAS_SEQ(wh)) {
/* Use HW sequence numbering for non-QoS frames. */
txd->txdw8 |= htole32(R12A_TXDW8_HWSEQ_EN);
txd->txdw3 |= htole32(SM(R12A_TXDW3_SEQ_SEL, uvp->id));
} else {
/* Set sequence number. */
txd->txdw9 |= htole32(SM(R12A_TXDW9_SEQ,
M_SEQNO_GET(m) % IEEE80211_SEQ_RANGE));
}
}
void
r12a_fill_tx_desc_null(struct rtwn_softc *sc, void *buf, int is11b, int qos,
int id)
{
struct r12a_tx_desc *txd = (struct r12a_tx_desc *)buf;
txd->flags0 = R12A_FLAGS0_FSG | R12A_FLAGS0_LSG | R12A_FLAGS0_OWN;
txd->txdw1 = htole32(
SM(R12A_TXDW1_QSEL, R12A_TXDW1_QSEL_MGNT));
txd->txdw3 = htole32(R12A_TXDW3_DRVRATE);
txd->txdw6 = htole32(SM(R21A_TXDW6_MBSSID, id));
if (is11b) {
txd->txdw4 = htole32(SM(R12A_TXDW4_DATARATE,
RTWN_RIDX_CCK1));
} else {
txd->txdw4 = htole32(SM(R12A_TXDW4_DATARATE,
RTWN_RIDX_OFDM6));
}
if (!qos) {
txd->txdw8 = htole32(R12A_TXDW8_HWSEQ_EN);
txd->txdw3 |= htole32(SM(R12A_TXDW3_SEQ_SEL, id));
}
}
uint8_t
r12a_tx_radiotap_flags(const void *buf)
{
const struct r12a_tx_desc *txd = buf;
uint8_t flags, rate;
if (!(txd->txdw5 & htole32(R12A_TXDW5_DATA_SHORT)))
return (0);
rate = MS(le32toh(txd->txdw4), R12A_TXDW4_DATARATE);
if (RTWN_RATE_IS_CCK(rate))
flags = IEEE80211_RADIOTAP_F_SHORTPRE;
else
flags = IEEE80211_RADIOTAP_F_SHORTGI;
return (flags);
}
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