@@ -258,10 +258,11 @@ struct mt76_rx_tid {
#define MT_TX_CB_TXS_DONE BIT(1)
#define MT_TX_CB_TXS_FAILED BIT(2)
-#define MT_PACKET_ID_MASK GENMASK(7, 0)
+#define MT_PACKET_ID_MASK GENMASK(6, 0)
#define MT_PACKET_ID_NO_ACK 0
#define MT_PACKET_ID_NO_SKB 1
#define MT_PACKET_ID_FIRST 2
+#define MT_PACKET_ID_HAS_RATE BIT(7)
#define MT_TX_STATUS_SKB_TIMEOUT HZ
@@ -689,6 +690,14 @@ static inline void mt76_insert_hdr_pad(struct sk_buff *skb)
skb->data[len + 1] = 0;
}
+static inline bool mt76_is_skb_pktid(u8 pktid)
+{
+ if (pktid & MT_PACKET_ID_HAS_RATE)
+ return false;
+
+ return pktid >= MT_PACKET_ID_FIRST;
+}
+
void mt76_rx(struct mt76_dev *dev, enum mt76_rxq_id q, struct sk_buff *skb);
void mt76_tx(struct mt76_dev *dev, struct ieee80211_sta *sta,
struct mt76_wcid *wcid, struct sk_buff *skb);
@@ -419,31 +419,87 @@ void mt76x02_mac_write_txwi(struct mt76x02_dev *dev, struct mt76x02_txwi *txwi,
}
EXPORT_SYMBOL_GPL(mt76x02_mac_write_txwi);
+static void
+mt76x02_tx_rate_fallback(struct ieee80211_tx_rate *rates, int idx, int phy)
+{
+ u8 mcs, nss;
+
+ if (!idx)
+ return;
+
+ rates += idx - 1;
+ rates[1] = rates[0];
+ switch (phy) {
+ case MT_PHY_TYPE_VHT:
+ mcs = ieee80211_rate_get_vht_mcs(rates);
+ nss = ieee80211_rate_get_vht_nss(rates);
+
+ if (mcs == 0)
+ nss = max_t(int, nss - 1, 1);
+ else
+ mcs--;
+
+ ieee80211_rate_set_vht(rates + 1, mcs, nss);
+ break;
+ case MT_PHY_TYPE_HT_GF:
+ case MT_PHY_TYPE_HT:
+ /* MCS 8 falls back to MCS 0 */
+ if (rates[0].idx == 8) {
+ rates[1].idx = 0;
+ break;
+ }
+ /* fall through */
+ default:
+ rates[1].idx = max_t(int, rates[0].idx - 1, 0);
+ break;
+ }
+}
+
static void
mt76x02_mac_fill_tx_status(struct mt76x02_dev *dev,
struct ieee80211_tx_info *info,
struct mt76x02_tx_status *st, int n_frames)
{
struct ieee80211_tx_rate *rate = info->status.rates;
- int cur_idx, last_rate;
+ struct ieee80211_tx_rate last_rate;
+ u16 first_rate;
+ int retry = st->retry;
+ int phy;
int i;
if (!n_frames)
return;
- last_rate = min_t(int, st->retry, IEEE80211_TX_MAX_RATES - 1);
- mt76x02_mac_process_tx_rate(&rate[last_rate], st->rate,
+ phy = FIELD_GET(MT_RXWI_RATE_PHY, st->rate);
+
+ if (st->pktid & MT_PACKET_ID_HAS_RATE) {
+ first_rate = st->rate & ~MT_RXWI_RATE_INDEX;
+ first_rate |= st->pktid & MT_RXWI_RATE_INDEX;
+
+ mt76x02_mac_process_tx_rate(&rate[0], first_rate,
+ dev->mt76.chandef.chan->band);
+ }
+
+ mt76x02_mac_process_tx_rate(&last_rate, st->rate,
dev->mt76.chandef.chan->band);
- if (last_rate < IEEE80211_TX_MAX_RATES - 1)
- rate[last_rate + 1].idx = -1;
-
- cur_idx = rate[last_rate].idx + last_rate;
- for (i = 0; i <= last_rate; i++) {
- rate[i].flags = rate[last_rate].flags;
- rate[i].idx = max_t(int, 0, cur_idx - i);
- rate[i].count = 1;
+
+ for (i = 0; i < ARRAY_SIZE(info->status.rates); i++) {
+ retry--;
+ if (i + 1 == ARRAY_SIZE(info->status.rates)) {
+ info->status.rates[i] = last_rate;
+ info->status.rates[i].count = max_t(int, retry, 1);
+ break;
+ }
+
+ mt76x02_tx_rate_fallback(info->status.rates, i, phy);
+ if (info->status.rates[i].idx == last_rate.idx)
+ break;
+ }
+
+ if (i + 1 < ARRAY_SIZE(info->status.rates)) {
+ info->status.rates[i + 1].idx = -1;
+ info->status.rates[i + 1].count = 0;
}
- rate[last_rate].count = st->retry + 1 - last_rate;
info->status.ampdu_len = n_frames;
info->status.ampdu_ack_len = st->success ? n_frames : 0;
@@ -489,13 +545,19 @@ void mt76x02_send_tx_status(struct mt76x02_dev *dev,
mt76_tx_status_lock(mdev, &list);
if (wcid) {
- if (stat->pktid >= MT_PACKET_ID_FIRST)
+ if (mt76_is_skb_pktid(stat->pktid))
status.skb = mt76_tx_status_skb_get(mdev, wcid,
stat->pktid, &list);
if (status.skb)
status.info = IEEE80211_SKB_CB(status.skb);
}
+ if (!status.skb && !(stat->pktid & MT_PACKET_ID_HAS_RATE)) {
+ mt76_tx_status_unlock(mdev, &list);
+ rcu_read_unlock();
+ return;
+ }
+
if (msta && stat->aggr && !status.skb) {
u32 stat_val, stat_cache;
@@ -164,9 +164,14 @@ int mt76x02_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
mt76x02_mac_write_txwi(dev, txwi, tx_info->skb, wcid, sta, len);
pid = mt76_tx_status_skb_add(mdev, wcid, tx_info->skb);
+
+ /* encode packet rate for no-skb packet id to fix up status reporting */
+ if (pid == MT_PACKET_ID_NO_SKB)
+ pid = MT_PACKET_ID_HAS_RATE | (txwi->rate & MT_RXWI_RATE_INDEX);
+
txwi->pktid = pid;
- if (pid >= MT_PACKET_ID_FIRST)
+ if (mt76_is_skb_pktid(pid))
qsel = MT_QSEL_MGMT;
tx_info->info = FIELD_PREP(MT_TXD_INFO_QSEL, qsel) |
@@ -89,9 +89,14 @@ int mt76x02u_tx_prepare_skb(struct mt76_dev *mdev, void *data,
skb_push(tx_info->skb, sizeof(*txwi));
pid = mt76_tx_status_skb_add(mdev, wcid, tx_info->skb);
+
+ /* encode packet rate for no-skb packet id to fix up status reporting */
+ if (pid == MT_PACKET_ID_NO_SKB)
+ pid = MT_PACKET_ID_HAS_RATE | (txwi->rate & MT_RXWI_RATE_INDEX);
+
txwi->pktid = pid;
- if (pid >= MT_PACKET_ID_FIRST || ep == MT_EP_OUT_HCCA)
+ if (mt76_is_skb_pktid(pid) || ep == MT_EP_OUT_HCCA)
qsel = MT_QSEL_MGMT;
else
qsel = MT_QSEL_EDCA;
When the hardware falls back to lower rates for a transmit attempt, only the first status report will show the number of retries correctly. The frames that follow will report the correct final rate, but number of retries set to 0. This can cause the rate control module to vastly underestimate the number of retransmissions per rate. To fix this, we need to keep track of the initial requested tx rate per packet and pass it to the status information. For frames with tx status requested, this is simple: use the rate configured in info->control.rates[0] as reference. For no-skb tx status information, we have to encode the requested tx rate in the packet id (and make it possible to distinguish it from real packet ids). To do that, reduce the packet id field size by one bit, and use that bit to indicate packet id vs rate. This change also improves reporting by filling the status rate array with rates from first rate to final rate, taking the same steps as the hardware fallback table. This matters in corner cases like MCS8 on HT, where the fallback target is MCS0, not MCS7. Signed-off-by: Felix Fietkau <nbd@nbd.name> --- drivers/net/wireless/mediatek/mt76/mt76.h | 11 ++- .../net/wireless/mediatek/mt76/mt76x02_mac.c | 88 ++++++++++++++++--- .../net/wireless/mediatek/mt76/mt76x02_txrx.c | 7 +- .../wireless/mediatek/mt76/mt76x02_usb_core.c | 7 +- 4 files changed, 97 insertions(+), 16 deletions(-)