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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 <90307219+0072a70@users.noreply.github.com>
Closes: https://github.com/morrownr/mt76/issues/38
Tested-by: 0072a70 <90307219+0072a70@users.noreply.github.com>
Signed-off-by: Devin Wittmayer <lucid_duck@justthetip.ca>
Link: https://patch.msgid.link/20260613002544.27750-3-lucid_duck@justthetip.ca
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Devin Wittmayer 2026-06-12 17:25:44 -07:00 committed by Felix Fietkau
parent 81497634d9
commit ddae0bcb01
1 changed files with 3 additions and 0 deletions
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3
drivers/net/wireless/mediatek/mt76/mt76x02_mac.c
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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;