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mt76: mt7921: fix firmware usage of RA info using legacy rates 

According to the firmware usage, OFDM rates should fill out bit 6 - 13
while CCK rates should fill out bit 0 - 3 in legacy field of RA info to
make the rate adaption runs propertly. Otherwise, a unicast frame might be
picking up the unsupported rate to send out.

Fixes: 1c099ab447 ("mt76: mt7921: add MCU support")
Reported-by: Joshua Emele <jemele@chromium.org>
Co-developed-by: YN Chen <YN.Chen@mediatek.com>
Signed-off-by: YN Chen <YN.Chen@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Sean Wang 2021-08-11 13:58:24 +08:00 committed by Felix Fietkau
parent 4d2423326d
commit 99b8e19599
2 changed files with 12 additions and 1 deletions
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11
drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
View File

@ -719,6 +719,7 @@ void mt76_connac_mcu_sta_tlv(struct mt76_phy *mphy, struct sk_buff *skb,
struct sta_rec_state *state;
struct sta_rec_phy *phy;
struct tlv *tlv;
u16 supp_rates;
/* starec ht */
if (sta->ht_cap.ht_supported) {
@ -767,7 +768,15 @@ void mt76_connac_mcu_sta_tlv(struct mt76_phy *mphy, struct sk_buff *skb,
tlv = mt76_connac_mcu_add_tlv(skb, STA_REC_RA, sizeof(*ra_info));
ra_info = (struct sta_rec_ra_info *)tlv;
ra_info->legacy = cpu_to_le16((u16)sta->supp_rates[band]);
supp_rates = sta->supp_rates[band];
if (band == NL80211_BAND_2GHZ)
supp_rates = FIELD_PREP(RA_LEGACY_OFDM, supp_rates >> 4) |
FIELD_PREP(RA_LEGACY_CCK, supp_rates & 0xf);
else
supp_rates = FIELD_PREP(RA_LEGACY_OFDM, supp_rates);
ra_info->legacy = cpu_to_le16(supp_rates);
if (sta->ht_cap.ht_supported)
memcpy(ra_info->rx_mcs_bitmask, sta->ht_cap.mcs.rx_mask,

2
drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.h
View File

@ -124,6 +124,8 @@ struct sta_rec_state {
u8 rsv[1];
} __packed;
#define RA_LEGACY_OFDM GENMASK(13, 6)
#define RA_LEGACY_CCK GENMASK(3, 0)
#define HT_MCS_MASK_NUM 10
struct sta_rec_ra_info {
__le16 tag;