[PATCH 2/2] wifi: iwlwifi: mld: Fix injected 5 GHz legacy rate

[benthecarman via B4 Relay <devnull+benthecarman1.gmail.com@kernel.org>]

From: benthecarman <benthecarman@live.com>

iwl_mld_get_inject_tx_rate() hands the legacy rate index from mac80211
to iwl_mld_mac80211_rate_idx_to_fw(), which expects the driver's rate
indices. Outside 2.4 GHz the mac80211 index points into a bitrate
table that starts at 6 Mbps, so a 12 Mbps injection on 5 or 6 GHz goes
out as 5.5 Mbps CCK.

Add IWL_FIRST_OFDM_RATE outside 2.4 GHz, as mvm does for frames that
are not injected.

Fixes: d1e879ec600f ("wifi: iwlwifi: add iwlmld sub-driver")
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: benthecarman <benthecarman@live.com>
---
 drivers/net/wireless/intel/iwlwifi/mld/tx.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mld/tx.c b/drivers/net/wireless/intel/iwlwifi/mld/tx.c
index fc501ac0c..317573b5e 100644
--- a/drivers/net/wireless/intel/iwlwifi/mld/tx.c
+++ b/drivers/net/wireless/intel/iwlwifi/mld/tx.c
@@ -599,7 +599,16 @@ static u32 iwl_mld_get_inject_tx_rate(struct iwl_mld *mld,
 		if (u32_get_bits(info->flags, IEEE80211_TX_CTL_STBC))
 			result |= RATE_MCS_STBC_MSK;
 	} else {
-		result = iwl_mld_mac80211_rate_idx_to_fw(mld, info, rate->idx);
+		int rate_idx = rate->idx;
+
+		/*
+		 * mac80211 indexes the band's bitrates, which start at
+		 * 6 Mbps outside 2.4 GHz; remap to our rate indices.
+		 */
+		if (info->band != NL80211_BAND_2GHZ)
+			rate_idx += IWL_FIRST_OFDM_RATE;
+
+		result = iwl_mld_mac80211_rate_idx_to_fw(mld, info, rate_idx);
 	}
 
 	if (info->control.antennas)

-- 
2.55.0