[PATCH 3/5] wifi: mt76: mt7603: improve stuck beacon handling

Felix Fietkau
2023-08-17T15:53:58Z

Before preparing the new beacon, check the queue status, flush out all
previous beacons and buffered multicast packets, then (if necessary)
try to recover more gracefully from a stuck beacon condition by making a
less invasive attempt at getting the MAC un-stuck.

Fixes: c8846e101502 ("mt76: add driver for MT7603E and MT7628/7688")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
.../wireless/mediatek/mt76/mt7603/beacon.c | 76 ++++++++++++++-----
.../net/wireless/mediatek/mt76/mt7603/regs.h | 5 ++
2 files changed, 60 insertions(+), 21 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7603/beacon.c b/drivers/net/wireless/mediatek/mt76/mt7603/beacon.c
index 888678732f29..c223f7c19e6d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7603/beacon.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7603/beacon.c
@@ -9,6 +9,23 @@ struct beacon_bc_data {
int count[MT7603_MAX_INTERFACES];
};

+static void
+mt7603_mac_stuck_beacon_recovery(struct mt7603_dev *dev)
+{
+ if (dev->beacon_check % 5 != 4)
+ return;
+
+ mt76_clear(dev, MT_WPDMA_GLO_CFG, MT_WPDMA_GLO_CFG_TX_DMA_EN);
+ mt76_set(dev, MT_SCH_4, MT_SCH_4_RESET);
+ mt76_clear(dev, MT_SCH_4, MT_SCH_4_RESET);
+ mt76_set(dev, MT_WPDMA_GLO_CFG, MT_WPDMA_GLO_CFG_TX_DMA_EN);
+
+ mt76_set(dev, MT_WF_CFG_OFF_WOCCR, MT_WF_CFG_OFF_WOCCR_TMAC_GC_DIS);
+ mt76_set(dev, MT_ARB_SCR, MT_ARB_SCR_TX_DISABLE);
+ mt76_clear(dev, MT_ARB_SCR, MT_ARB_SCR_TX_DISABLE);
+ mt76_clear(dev, MT_WF_CFG_OFF_WOCCR, MT_WF_CFG_OFF_WOCCR_TMAC_GC_DIS);
+}
+
static void
mt7603_update_beacon_iter(void *priv, u8 *mac, struct ieee80211_vif *vif)
{
@@ -16,6 +33,8 @@ mt7603_update_beacon_iter(void *priv, u8 *mac, struct ieee80211_vif *vif)
struct mt76_dev *mdev = &dev->mt76;
struct mt7603_vif *mvif = (struct mt7603_vif *)vif->drv_priv;
struct sk_buff *skb = NULL;
+ u32 om_idx = mvif->idx;
+ u32 val;

if (!(mdev->beacon_mask & BIT(mvif->idx)))
return;
@@ -24,20 +43,33 @@ mt7603_update_beacon_iter(void *priv, u8 *mac, struct ieee80211_vif *vif)
if (!skb)
return;

- mt76_tx_queue_skb(dev, dev->mphy.q_tx[MT_TXQ_BEACON],
- MT_TXQ_BEACON, skb, &mvif->sta.wcid, NULL);
+ if (om_idx)
+ om_idx |= 0x10;
+ val = MT_DMA_FQCR0_BUSY | MT_DMA_FQCR0_MODE |
+ FIELD_PREP(MT_DMA_FQCR0_TARGET_BSS, om_idx) |
+ FIELD_PREP(MT_DMA_FQCR0_DEST_PORT_ID, 3) |
+ FIELD_PREP(MT_DMA_FQCR0_DEST_QUEUE_ID, 8);

spin_lock_bh(&dev->ps_lock);
- mt76_wr(dev, MT_DMA_FQCR0, MT_DMA_FQCR0_BUSY |
- FIELD_PREP(MT_DMA_FQCR0_TARGET_WCID, mvif->sta.wcid.idx) |
- FIELD_PREP(MT_DMA_FQCR0_TARGET_QID,
- dev->mphy.q_tx[MT_TXQ_CAB]->hw_idx) |
- FIELD_PREP(MT_DMA_FQCR0_DEST_PORT_ID, 3) |
- FIELD_PREP(MT_DMA_FQCR0_DEST_QUEUE_ID, 8));

- if (!mt76_poll(dev, MT_DMA_FQCR0, MT_DMA_FQCR0_BUSY, 0, 5000))
+ mt76_wr(dev, MT_DMA_FQCR0, val |
+ FIELD_PREP(MT_DMA_FQCR0_TARGET_QID, MT_TX_HW_QUEUE_BCN));
+ if (!mt76_poll(dev, MT_DMA_FQCR0, MT_DMA_FQCR0_BUSY, 0, 5000)) {
dev->beacon_check = MT7603_WATCHDOG_TIMEOUT;
+ goto out;
+ }
+
+ mt76_wr(dev, MT_DMA_FQCR0, val |
+ FIELD_PREP(MT_DMA_FQCR0_TARGET_QID, MT_TX_HW_QUEUE_BMC));
+ if (!mt76_poll(dev, MT_DMA_FQCR0, MT_DMA_FQCR0_BUSY, 0, 5000)) {
+ dev->beacon_check = MT7603_WATCHDOG_TIMEOUT;
+ goto out;
+ }

+ mt76_tx_queue_skb(dev, dev->mphy.q_tx[MT_TXQ_BEACON],
+ MT_TXQ_BEACON, skb, &mvif->sta.wcid, NULL);
+
+out:
spin_unlock_bh(&dev->ps_lock);
}

@@ -81,6 +113,18 @@ void mt7603_pre_tbtt_tasklet(struct tasklet_struct *t)
data.dev = dev;
__skb_queue_head_init(&data.q);

+ /* Flush all previous CAB queue packets and beacons */
+ mt76_wr(dev, MT_WF_ARB_CAB_FLUSH, GENMASK(30, 16) | BIT(0));
+
+ mt76_queue_tx_cleanup(dev, dev->mphy.q_tx[MT_TXQ_CAB], false);
+ mt76_queue_tx_cleanup(dev, dev->mphy.q_tx[MT_TXQ_BEACON], false);
+
+ if (dev->mphy.q_tx[MT_TXQ_BEACON]->queued > 0)
+ dev->beacon_check++;
+ else
+ dev->beacon_check = 0;
+ mt7603_mac_stuck_beacon_recovery(dev);
+
q = dev->mphy.q_tx[MT_TXQ_BEACON];
spin_lock(&q->lock);
ieee80211_iterate_active_interfaces_atomic(mt76_hw(dev),
@@ -89,14 +133,9 @@ void mt7603_pre_tbtt_tasklet(struct tasklet_struct *t)
mt76_queue_kick(dev, q);
spin_unlock(&q->lock);

- /* Flush all previous CAB queue packets */
- mt76_wr(dev, MT_WF_ARB_CAB_FLUSH, GENMASK(30, 16) | BIT(0));
-
- mt76_queue_tx_cleanup(dev, dev->mphy.q_tx[MT_TXQ_CAB], false);
-
mt76_csa_check(mdev);
if (mdev->csa_complete)
- goto out;
+ return;

q = dev->mphy.q_tx[MT_TXQ_CAB];
do {
@@ -108,7 +147,7 @@ void mt7603_pre_tbtt_tasklet(struct tasklet_struct *t)
skb_queue_len(&data.q) < 8);

if (skb_queue_empty(&data.q))
- goto out;
+ return;

for (i = 0; i < ARRAY_SIZE(data.tail); i++) {
if (!data.tail[i])
@@ -136,11 +175,6 @@ void mt7603_pre_tbtt_tasklet(struct tasklet_struct *t)
MT_WF_ARB_CAB_START_BSSn(0) |
(MT_WF_ARB_CAB_START_BSS0n(1) *
((1 << (MT7603_MAX_INTERFACES - 1)) - 1)));
-
-out:
- mt76_queue_tx_cleanup(dev, dev->mphy.q_tx[MT_TXQ_BEACON], false);
- if (dev->mphy.q_tx[MT_TXQ_BEACON]->queued > hweight8(mdev->beacon_mask))
- dev->beacon_check++;
}

void mt7603_beacon_set_timer(struct mt7603_dev *dev, int idx, int intval)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7603/regs.h b/drivers/net/wireless/mediatek/mt76/mt7603/regs.h
index a39c9a0fcb1c..524bceb8e958 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7603/regs.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7603/regs.h
@@ -469,6 +469,11 @@ enum {
#define MT_WF_SEC_BASE 0x21a00
#define MT_WF_SEC(ofs) (MT_WF_SEC_BASE + (ofs))

+#define MT_WF_CFG_OFF_BASE 0x21e00
+#define MT_WF_CFG_OFF(ofs) (MT_WF_CFG_OFF_BASE + (ofs))
+#define MT_WF_CFG_OFF_WOCCR MT_WF_CFG_OFF(0x004)
+#define MT_WF_CFG_OFF_WOCCR_TMAC_GC_DIS BIT(4)
+
#define MT_SEC_SCR MT_WF_SEC(0x004)
#define MT_SEC_SCR_MASK_ORDER GENMASK(1, 0)

--
2.41.0