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wifi: mt76: mt76x02: report rx FCS errors to mac80211

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When the fcsfail filter is enabled the hardware passes frames with a bad
FCS up to the driver, but mt76x02_mac_process_rx() never checks
MT_RXINFO_CRCERR and hands them to mac80211 without
RX_FLAG_FAILED_FCS_CRC. In monitor mode the radiotap flags byte then
never gets IEEE80211_RADIOTAP_F_BADFCS set and corrupted frames cannot be
told apart from clean ones.

Set RX_FLAG_FAILED_FCS_CRC from the descriptor CRC error bit, matching
mt7603, mt7615, mt7915, mt7921, mt7925 and mt7996.

Reported-by: 0072a70 <[email protected]>
Closes: https://github.com/morrownr/mt76/issues/38
Tested-by: 0072a70 <[email protected]>
Signed-off-by: Devin Wittmayer <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Devin Wittmayer
2026-07-21 10:30:02 +02:00
committed by Felix Fietkau
parent 49795048d9
commit f5dc4270d2
1 changed files with 3 additions and 0 deletions
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mt76x02_mac.c
+3
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@@ -792,6 +792,9 @@ int mt76x02_mac_process_rx(struct mt76x02_dev *dev, struct sk_buff *skb,
if (rxinfo & MT_RXINFO_L2PAD)
pad_len += 2;
if (rxinfo & MT_RXINFO_CRCERR)
status->flag |= RX_FLAG_FAILED_FCS_CRC;
if (rxinfo & MT_RXINFO_DECRYPT) {
status->flag |= RX_FLAG_DECRYPTED;
status->flag |= RX_FLAG_MMIC_STRIPPED;