[10/15] wifi: iwlwifi: mvm: use FW rate for non-data only on new devices

Commit Message

Korenblit, Miriam Rachel Jan. 29, 2024, 7:21 p.m. UTC

From: Johannes Berg <[e-mail]>

With MLO connections we need to let the firmware pick the rate
as we don't know the link the frame might be transmitted on
(in some cases we do know, but we'd rather always use the FW
and find bugs.) We _did_ end up finding bugs and fixing them,
but older devices likely won't get fixed as we don't have a
need for this there, they cannot support MLO.

Thus, go back to picking a rate on the host for the relevant
frames on older (pre-Bz) devices.

Fixes: 499d02790495 ("wifi: iwlwifi: Use FW rate for non-data frames")
Signed-off-by: Johannes Berg <[e-mail]>
Signed-off-by: Miri Korenblit <[e-mail]>
---
 drivers/net/wireless/intel/iwlwifi/mvm/tx.c | 33 ++++++++++++++++++---
 1 file changed, 29 insertions(+), 4 deletions(-)

Patch

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
index db986bfc4dc3..79eb6394e5a7 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
@@ -520,6 +520,31 @@  static void iwl_mvm_set_tx_cmd_crypto(struct iwl_mvm *mvm,
 	}
 }
 
+static bool iwl_mvm_use_host_rate(struct iwl_mvm *mvm,
+				  struct iwl_mvm_sta *mvmsta,
+				  struct ieee80211_hdr *hdr,
+				  struct ieee80211_tx_info *info)
+{
+	if (unlikely(!mvmsta))
+		return true;
+
+	if (unlikely(info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT))
+		return true;
+
+	if (likely(ieee80211_is_data(hdr->frame_control) &&
+		   mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED))
+		return false;
+
+	/*
+	 * Not a data frame, use host rate if on an old device that
+	 * can't possibly be doing MLO (firmware may be selecting a
+	 * bad rate), if we might be doing MLO we need to let FW pick
+	 * (since we don't necesarily know the link), but FW rate
+	 * selection was fixed.
+	 */
+	return mvm->trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_BZ;
+}
+
 /*
  * Allocates and sets the Tx cmd the driver data pointers in the skb
  */
@@ -556,12 +581,12 @@  iwl_mvm_set_tx_params(struct iwl_mvm *mvm, struct sk_buff *skb,
 			flags |= IWL_TX_FLAGS_ENCRYPT_DIS;
 
 		/*
-		 * For data and mgmt packets rate info comes from the fw. Only
+		 * For data and mgmt packets rate info comes from the fw (for
+		 * new devices, older FW is somewhat broken for this). Only
 		 * set rate/antenna for injected frames with fixed rate, or
-		 * when no sta is given.
+		 * when no sta is given, or with older firmware.
 		 */
-		if (unlikely(!sta ||
-			     info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)) {
+		if (unlikely(iwl_mvm_use_host_rate(mvm, mvmsta, hdr, info))) {
 			flags |= IWL_TX_FLAGS_CMD_RATE;
 			rate_n_flags =
 				iwl_mvm_get_tx_rate_n_flags(mvm, info, sta,