void
ath_rate_tx_complete(struct ath_softc *sc, struct ath_node *an,
const struct ath_rc_series *rc, const struct ath_tx_status *ts,
int frame_size, int nframes, int nbad)
{
struct ifnet *ifp = sc->sc_ifp;
struct ieee80211com *ic = ifp->if_l2com;
struct sample_node *sn = ATH_NODE_SAMPLE(an);
int final_rix, short_tries, long_tries;
const HAL_RATE_TABLE *rt = sc->sc_currates;
int status = ts->ts_status;
int mrr;
final_rix = rt->rateCodeToIndex[ts->ts_rate];
short_tries = ts->ts_shortretry;
long_tries = ts->ts_longretry + 1;
if (frame_size == 0) /* NB: should not happen */
frame_size = 1500;
if (sn->ratemask == 0) {
IEEE80211_NOTE(an->an_node.ni_vap, IEEE80211_MSG_RATECTL,
&an->an_node,
"%s: size %d %s rate/try %d/%d no rates yet",
__func__,
bin_to_size(size_to_bin(frame_size)),
status ? "FAIL" : "OK",
short_tries, long_tries);
return;
}
mrr = sc->sc_mrretry && !(ic->ic_flags & IEEE80211_F_USEPROT);
if (!mrr || ts->ts_finaltsi == 0) {
if (!IS_RATE_DEFINED(sn, final_rix)) {
badrate(ifp, 0, ts->ts_rate, long_tries, status);
return;
}
/*
* Only one rate was used; optimize work.
*/
IEEE80211_NOTE(an->an_node.ni_vap, IEEE80211_MSG_RATECTL,
&an->an_node, "%s: size %d (%d bytes) %s rate/try %d %s/%d/%d nframes/nbad [%d/%d]",
__func__,
bin_to_size(size_to_bin(frame_size)),
frame_size,
status ? "FAIL" : "OK",
dot11rate(rt, final_rix), dot11rate_label(rt, final_rix),
short_tries, long_tries, nframes, nbad);
update_stats(sc, an, frame_size,
final_rix, long_tries,
0, 0,
0, 0,
0, 0,
short_tries, long_tries, status,
nframes, nbad);
update_ewma_stats(sc, an, frame_size,
final_rix, long_tries,
0, 0,
0, 0,
0, 0,
short_tries, long_tries, status,
nframes, nbad);
} else {
int finalTSIdx = ts->ts_finaltsi;
int i;
/*
* Process intermediate rates that failed.
*/
IEEE80211_NOTE(an->an_node.ni_vap, IEEE80211_MSG_RATECTL,
&an->an_node,
"%s: size %d (%d bytes) finaltsidx %d tries %d %s rate/try [%d %s/%d %d %s/%d %d %s/%d %d %s/%d] nframes/nbad [%d/%d]",
__func__,
bin_to_size(size_to_bin(frame_size)),
frame_size,
finalTSIdx,
long_tries,
status ? "FAIL" : "OK",
dot11rate(rt, rc[0].rix),
dot11rate_label(rt, rc[0].rix), rc[0].tries,
dot11rate(rt, rc[1].rix),
dot11rate_label(rt, rc[1].rix), rc[1].tries,
dot11rate(rt, rc[2].rix),
dot11rate_label(rt, rc[2].rix), rc[2].tries,
dot11rate(rt, rc[3].rix),
dot11rate_label(rt, rc[3].rix), rc[3].tries,
nframes, nbad);
for (i = 0; i < 4; i++) {
if (rc[i].tries && !IS_RATE_DEFINED(sn, rc[i].rix))
badrate(ifp, 0, rc[i].ratecode, rc[i].tries,
status);
}
/*
* NB: series > 0 are not penalized for failure
* based on the try counts under the assumption
* that losses are often bursty and since we
* sample higher rates 1 try at a time doing so
* may unfairly penalize them.
*/
if (rc[0].tries) {
update_stats(sc, an, frame_size,
rc[0].rix, rc[0].tries,
rc[1].rix, rc[1].tries,
rc[2].rix, rc[2].tries,
rc[3].rix, rc[3].tries,
short_tries, long_tries,
long_tries > rc[0].tries,
nframes, nbad);
long_tries -= rc[0].tries;
}
if (rc[1].tries && finalTSIdx > 0) {
update_stats(sc, an, frame_size,
rc[1].rix, rc[1].tries,
rc[2].rix, rc[2].tries,
rc[3].rix, rc[3].tries,
0, 0,
short_tries, long_tries,
status,
nframes, nbad);
long_tries -= rc[1].tries;
}
if (rc[2].tries && finalTSIdx > 1) {
update_stats(sc, an, frame_size,
rc[2].rix, rc[2].tries,
rc[3].rix, rc[3].tries,
0, 0,
0, 0,
short_tries, long_tries,
status,
nframes, nbad);
long_tries -= rc[2].tries;
}
if (rc[3].tries && finalTSIdx > 2) {
update_stats(sc, an, frame_size,
rc[3].rix, rc[3].tries,
0, 0,
0, 0,
0, 0,
short_tries, long_tries,
status,
nframes, nbad);
}
update_ewma_stats(sc, an, frame_size,
rc[0].rix, rc[0].tries,
rc[1].rix, rc[1].tries,
rc[2].rix, rc[2].tries,
rc[3].rix, rc[3].tries,
short_tries, long_tries,
long_tries > rc[0].tries,
nframes, nbad);
}
}
static void
update_stats(struct ath_softc *sc, struct ath_node *an,
int frame_size,
int rix0, int tries0,
int rix1, int tries1,
int rix2, int tries2,
int rix3, int tries3,
int short_tries, int tries, int status,
int nframes, int nbad)
{
struct sample_node *sn = ATH_NODE_SAMPLE(an);
struct sample_softc *ssc = ATH_SOFTC_SAMPLE(sc);
#ifdef IEEE80211_DEBUG
const HAL_RATE_TABLE *rt = sc->sc_currates;
#endif
const int size_bin = size_to_bin(frame_size);
const int size = bin_to_size(size_bin);
int tt, tries_so_far;
int is_ht40 = (an->an_node.ni_chw == 40);
if (!IS_RATE_DEFINED(sn, rix0))
return;
tt = calc_usecs_unicast_packet(sc, size, rix0, short_tries,
MIN(tries0, tries) - 1, is_ht40);
tries_so_far = tries0;
if (tries1 && tries_so_far < tries) {
if (!IS_RATE_DEFINED(sn, rix1))
return;
tt += calc_usecs_unicast_packet(sc, size, rix1, short_tries,
MIN(tries1 + tries_so_far, tries) - tries_so_far - 1, is_ht40);
tries_so_far += tries1;
}
if (tries2 && tries_so_far < tries) {
if (!IS_RATE_DEFINED(sn, rix2))
return;
tt += calc_usecs_unicast_packet(sc, size, rix2, short_tries,
MIN(tries2 + tries_so_far, tries) - tries_so_far - 1, is_ht40);
tries_so_far += tries2;
}
if (tries3 && tries_so_far < tries) {
if (!IS_RATE_DEFINED(sn, rix3))
return;
tt += calc_usecs_unicast_packet(sc, size, rix3, short_tries,
MIN(tries3 + tries_so_far, tries) - tries_so_far - 1, is_ht40);
}
if (sn->stats[size_bin][rix0].total_packets < ssc->smoothing_minpackets) {
/* just average the first few packets */
int avg_tx = sn->stats[size_bin][rix0].average_tx_time;
int packets = sn->stats[size_bin][rix0].total_packets;
sn->stats[size_bin][rix0].average_tx_time = (tt+(avg_tx*packets))/(packets+nframes);
} else {
/* use a ewma */
sn->stats[size_bin][rix0].average_tx_time =
((sn->stats[size_bin][rix0].average_tx_time * ssc->smoothing_rate) +
(tt * (100 - ssc->smoothing_rate))) / 100;
}
/*
* XXX Don't mark the higher bit rates as also having failed; as this
* unfortunately stops those rates from being tasted when trying to
* TX. This happens with 11n aggregation.
*/
if (nframes == nbad) {
#if 0
int y;
#endif
sn->stats[size_bin][rix0].successive_failures += nbad;
#if 0
for (y = size_bin+1; y < NUM_PACKET_SIZE_BINS; y++) {
/*
* Also say larger packets failed since we
* assume if a small packet fails at a
* bit-rate then a larger one will also.
*/
sn->stats[y][rix0].successive_failures += nbad;
sn->stats[y][rix0].last_tx = ticks;
sn->stats[y][rix0].tries += tries;
sn->stats[y][rix0].total_packets += nframes;
}
#endif
} else {
sn->stats[size_bin][rix0].packets_acked += (nframes - nbad);
sn->stats[size_bin][rix0].successive_failures = 0;
}
sn->stats[size_bin][rix0].tries += tries;
sn->stats[size_bin][rix0].last_tx = ticks;
sn->stats[size_bin][rix0].total_packets += nframes;
if (rix0 == sn->current_sample_rix[size_bin]) {
IEEE80211_NOTE(an->an_node.ni_vap, IEEE80211_MSG_RATECTL,
&an->an_node,
"%s: size %d %s sample rate %d %s tries (%d/%d) tt %d avg_tt (%d/%d) nfrm %d nbad %d",
__func__,
size,
status ? "FAIL" : "OK",
dot11rate(rt, rix0),
dot11rate_label(rt, rix0),
short_tries, tries, tt,
sn->stats[size_bin][rix0].average_tx_time,
sn->stats[size_bin][rix0].perfect_tx_time,
nframes, nbad);
sn->sample_tt[size_bin] = tt;
sn->current_sample_rix[size_bin] = -1;
}
}
/*
* Initialize the tables for a node.
*/
static void
ath_rate_ctl_reset(struct ath_softc *sc, struct ieee80211_node *ni)
{
#define RATE(_ix) (ni->ni_rates.rs_rates[(_ix)] & IEEE80211_RATE_VAL)
#define DOT11RATE(_ix) (rt->info[(_ix)].dot11Rate & IEEE80211_RATE_VAL)
#define MCS(_ix) (ni->ni_htrates.rs_rates[_ix] | IEEE80211_RATE_MCS)
struct ath_node *an = ATH_NODE(ni);
struct sample_node *sn = ATH_NODE_SAMPLE(an);
const HAL_RATE_TABLE *rt = sc->sc_currates;
int x, y, rix;
KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
KASSERT(sc->sc_curmode < IEEE80211_MODE_MAX+2,
("curmode %u", sc->sc_curmode));
sn->sched = mrr_schedules[sc->sc_curmode];
KASSERT(sn->sched != NULL,
("no mrr schedule for mode %u", sc->sc_curmode));
sn->static_rix = -1;
ath_rate_update_static_rix(sc, ni);
/*
* Construct a bitmask of usable rates. This has all
* negotiated rates minus those marked by the hal as
* to be ignored for doing rate control.
*/
sn->ratemask = 0;
/* MCS rates */
if (ni->ni_flags & IEEE80211_NODE_HT) {
for (x = 0; x < ni->ni_htrates.rs_nrates; x++) {
rix = sc->sc_rixmap[MCS(x)];
if (rix == 0xff)
continue;
/* skip rates marked broken by hal */
if (!rt->info[rix].valid)
continue;
KASSERT(rix < SAMPLE_MAXRATES,
("mcs %u has rix %d", MCS(x), rix));
sn->ratemask |= 1<<rix;
}
}
/* Legacy rates */
for (x = 0; x < ni->ni_rates.rs_nrates; x++) {
rix = sc->sc_rixmap[RATE(x)];
if (rix == 0xff)
continue;
/* skip rates marked broken by hal */
if (!rt->info[rix].valid)
continue;
KASSERT(rix < SAMPLE_MAXRATES,
("rate %u has rix %d", RATE(x), rix));
sn->ratemask |= 1<<rix;
}
#ifdef IEEE80211_DEBUG
if (ieee80211_msg(ni->ni_vap, IEEE80211_MSG_RATECTL)) {
uint32_t mask;
ieee80211_note(ni->ni_vap, "[%6D] %s: size 1600 rate/tt",
ni->ni_macaddr, ":", __func__);
for (mask = sn->ratemask, rix = 0; mask != 0; mask >>= 1, rix++) {
if ((mask & 1) == 0)
continue;
printf(" %d %s/%d", dot11rate(rt, rix), dot11rate_label(rt, rix),
calc_usecs_unicast_packet(sc, 1600, rix, 0,0,
(ni->ni_chw == 40)));
}
printf("\n");
}
void
ath_rate_findrate(struct ath_softc *sc, struct ath_node *an,
int shortPreamble, size_t frameLen,
u_int8_t *rix0, int *try0, u_int8_t *txrate)
{
#define DOT11RATE(ix) (rt->info[ix].dot11Rate & IEEE80211_RATE_VAL)
#define MCS(ix) (rt->info[ix].dot11Rate | IEEE80211_RATE_MCS)
#define RATE(ix) (DOT11RATE(ix) / 2)
struct sample_node *sn = ATH_NODE_SAMPLE(an);
struct sample_softc *ssc = ATH_SOFTC_SAMPLE(sc);
struct ifnet *ifp = sc->sc_ifp;
struct ieee80211com *ic = ifp->if_l2com;
const HAL_RATE_TABLE *rt = sc->sc_currates;
const int size_bin = size_to_bin(frameLen);
int rix, mrr, best_rix, change_rates;
unsigned average_tx_time;
ath_rate_update_static_rix(sc, &an->an_node);
if (sn->static_rix != -1) {
rix = sn->static_rix;
*try0 = ATH_TXMAXTRY;
goto done;
}
/* XXX TODO: this doesn't know about 11gn vs 11g protection; teach it */
mrr = sc->sc_mrretry && !(ic->ic_flags & IEEE80211_F_USEPROT);
best_rix = pick_best_rate(an, rt, size_bin, !mrr);
if (best_rix >= 0) {
average_tx_time = sn->stats[size_bin][best_rix].average_tx_time;
} else {
average_tx_time = 0;
}
/*
* Limit the time measuring the performance of other tx
* rates to sample_rate% of the total transmission time.
*/
if (sn->sample_tt[size_bin] < average_tx_time * (sn->packets_since_sample[size_bin]*ssc->sample_rate/100)) {
rix = pick_sample_rate(ssc, an, rt, size_bin);
IEEE80211_NOTE(an->an_node.ni_vap, IEEE80211_MSG_RATECTL,
&an->an_node, "att %d sample_tt %d size %u sample rate %d %s current rate %d %s",
average_tx_time,
sn->sample_tt[size_bin],
bin_to_size(size_bin),
dot11rate(rt, rix),
dot11rate_label(rt, rix),
dot11rate(rt, sn->current_rix[size_bin]),
dot11rate_label(rt, sn->current_rix[size_bin]));
if (rix != sn->current_rix[size_bin]) {
sn->current_sample_rix[size_bin] = rix;
} else {
sn->current_sample_rix[size_bin] = -1;
}
sn->packets_since_sample[size_bin] = 0;
} else {
change_rates = 0;
if (!sn->packets_sent[size_bin] || best_rix == -1) {
/* no packet has been sent successfully yet */
change_rates = 1;
if (an->an_node.ni_flags & IEEE80211_NODE_HT)
best_rix =
ath_rate_pick_seed_rate_ht(sc, an, frameLen);
else
best_rix =
ath_rate_pick_seed_rate_legacy(sc, an, frameLen);
} else if (sn->packets_sent[size_bin] < 20) {
/* let the bit-rate switch quickly during the first few packets */
IEEE80211_NOTE(an->an_node.ni_vap,
IEEE80211_MSG_RATECTL, &an->an_node,
"%s: switching quickly..", __func__);
change_rates = 1;
} else if (ticks - ssc->min_switch > sn->ticks_since_switch[size_bin]) {
/* min_switch seconds have gone by */
IEEE80211_NOTE(an->an_node.ni_vap,
IEEE80211_MSG_RATECTL, &an->an_node,
"%s: min_switch %d > ticks_since_switch %d..",
__func__, ticks - ssc->min_switch, sn->ticks_since_switch[size_bin]);
change_rates = 1;
} else if ((! (an->an_node.ni_flags & IEEE80211_NODE_HT)) &&
(2*average_tx_time < sn->stats[size_bin][sn->current_rix[size_bin]].average_tx_time)) {
/* the current bit-rate is twice as slow as the best one */
IEEE80211_NOTE(an->an_node.ni_vap,
IEEE80211_MSG_RATECTL, &an->an_node,
"%s: 2x att (= %d) < cur_rix att %d",
__func__,
2 * average_tx_time, sn->stats[size_bin][sn->current_rix[size_bin]].average_tx_time);
change_rates = 1;
} else if ((an->an_node.ni_flags & IEEE80211_NODE_HT)) {
int cur_rix = sn->current_rix[size_bin];
int cur_att = sn->stats[size_bin][cur_rix].average_tx_time;
/*
* If the node is HT, upgrade it if the MCS rate is
* higher and the average tx time is within 20% of
* the current rate. It can fail a little.
*
* This is likely not optimal!
*/
#if 0
printf("cur rix/att %x/%d, best rix/att %x/%d\n",
MCS(cur_rix), cur_att, MCS(best_rix), average_tx_time);
#endif
if ((MCS(best_rix) > MCS(cur_rix)) &&
(average_tx_time * 8) <= (cur_att * 10)) {
IEEE80211_NOTE(an->an_node.ni_vap,
IEEE80211_MSG_RATECTL, &an->an_node,
"%s: HT: best_rix 0x%d > cur_rix 0x%x, average_tx_time %d, cur_att %d",
__func__,
MCS(best_rix), MCS(cur_rix), average_tx_time, cur_att);
change_rates = 1;
}
}
sn->packets_since_sample[size_bin]++;
if (change_rates) {
if (best_rix != sn->current_rix[size_bin]) {
IEEE80211_NOTE(an->an_node.ni_vap,
IEEE80211_MSG_RATECTL,
&an->an_node,
"%s: size %d switch rate %d (%d/%d) -> %d (%d/%d) after %d packets mrr %d",
__func__,
bin_to_size(size_bin),
RATE(sn->current_rix[size_bin]),
sn->stats[size_bin][sn->current_rix[size_bin]].average_tx_time,
sn->stats[size_bin][sn->current_rix[size_bin]].perfect_tx_time,
RATE(best_rix),
sn->stats[size_bin][best_rix].average_tx_time,
sn->stats[size_bin][best_rix].perfect_tx_time,
sn->packets_since_switch[size_bin],
mrr);
}
sn->packets_since_switch[size_bin] = 0;
sn->current_rix[size_bin] = best_rix;
sn->ticks_since_switch[size_bin] = ticks;
/*
* Set the visible txrate for this node.
*/
an->an_node.ni_txrate = (rt->info[best_rix].phy == IEEE80211_T_HT) ? MCS(best_rix) : DOT11RATE(best_rix);
}
rix = sn->current_rix[size_bin];
sn->packets_since_switch[size_bin]++;
}
*try0 = mrr ? sn->sched[rix].t0 : ATH_TXMAXTRY;
done:
KASSERT(rix >= 0 && rix < rt->rateCount, ("rix is %d", rix));
*rix0 = rix;
*txrate = rt->info[rix].rateCode
| (shortPreamble ? rt->info[rix].shortPreamble : 0);
sn->packets_sent[size_bin]++;
#undef DOT11RATE
#undef MCS
#undef RATE
}
static void
ath_sample_stats(struct ath_ratestats *r, struct ath_rateioctl_rt *rt,
struct sample_node *sn)
{
uint32_t mask;
int rix, y;
PRINTMSG("static_rix (%d) ratemask 0x%llx\n",
sn->static_rix,
(long long) sn->ratemask);
for (y = 0; y < NUM_PACKET_SIZE_BINS; y++) {
PRINTATTR_ON(COLOR_PAIR(y+4) | A_BOLD);
PRINTMSG("[%4u] cur rate %d %s since switch: "
"packets %d ticks %u\n",
bin_to_size(y),
dot11rate(rt, sn->current_rix[y]),
dot11str(rt, sn->current_rix[y]),
sn->packets_since_switch[y],
sn->ticks_since_switch[y]);
PRINTMSG("[%4u] last sample (%d %s) cur sample (%d %s) "
"packets sent %d\n",
bin_to_size(y),
dot11rate(rt, sn->last_sample_rix[y]),
dot11str(rt, sn->last_sample_rix[y]),
dot11rate(rt, sn->current_sample_rix[y]),
dot11str(rt, sn->current_sample_rix[y]),
sn->packets_sent[y]);
PRINTATTR_OFF(COLOR_PAIR(y+4) | A_BOLD);
PRINTATTR_ON(COLOR_PAIR(3) | A_BOLD);
PRINTMSG("[%4u] packets since sample %d sample tt %u\n",
bin_to_size(y),
sn->packets_since_sample[y],
sn->sample_tt[y]);
PRINTATTR_OFF(COLOR_PAIR(3) | A_BOLD);
PRINTMSG("\n");
}
PRINTMSG(" TX Rate TXTOTAL:TXOK EWMA T/ F"
" avg last xmit\n");
for (mask = sn->ratemask, rix = 0; mask != 0; mask >>= 1, rix++) {
if ((mask & 1) == 0)
continue;
for (y = 0; y < NUM_PACKET_SIZE_BINS; y++) {
if (sn->stats[y][rix].total_packets == 0)
continue;
if (rix == sn->current_rix[y])
PRINTATTR_ON(COLOR_PAIR(y+4) | A_BOLD);
else if (rix == sn->last_sample_rix[y])
PRINTATTR_ON(COLOR_PAIR(3) | A_BOLD);
#if 0
else if (sn->stats[y][rix].ewma_pct / 10 < 50)
PRINTATTR_ON(COLOR_PAIR(2) | A_BOLD);
else if (sn->stats[y][rix].ewma_pct / 10 < 75)
PRINTATTR_ON(COLOR_PAIR(1) | A_BOLD);
#endif
PRINTMSG("[%2u %s:%4u] %8ju:%-8ju "
"(%3d.%1d%%) %8ju/%4d %5uuS %u\n",
dot11rate(rt, rix),
dot11str(rt, rix),
bin_to_size(y),
(uintmax_t) sn->stats[y][rix].total_packets,
(uintmax_t) sn->stats[y][rix].packets_acked,
sn->stats[y][rix].ewma_pct / 10,
sn->stats[y][rix].ewma_pct % 10,
(uintmax_t) sn->stats[y][rix].tries,
sn->stats[y][rix].successive_failures,
sn->stats[y][rix].average_tx_time,
sn->stats[y][rix].last_tx);
if (rix == sn->current_rix[y])
PRINTATTR_OFF(COLOR_PAIR(y+4) | A_BOLD);
else if (rix == sn->last_sample_rix[y])
PRINTATTR_OFF(COLOR_PAIR(3) | A_BOLD);
#if 0
else if (sn->stats[y][rix].ewma_pct / 10 < 50)
PRINTATTR_OFF(COLOR_PAIR(2) | A_BOLD);
else if (sn->stats[y][rix].ewma_pct / 10 < 75)
PRINTATTR_OFF(COLOR_PAIR(1) | A_BOLD);
#endif
}
}
}
