[PATCH v2] wifi: iwlwifi: mld: include VI packets in low latency detection

[PATCH v2] wifi: iwlwifi: mld: include VI packets in low latency detection

[Endrik Einberg]

iwl_mld_is_vo_vi_pkt() checks whether the mapped access category
is less than IEEE80211_AC_VI.
Since mac80211 defines IEEE80211_AC_VO as 0 and IEEE80211_AC_VI as 1,
this only matches voice traffic and excludes video traffic.

This was discovered during Wi-Fi troubleshooting with LLM assistance,
then confirmed through runtime testing and manual code inspection.
Synthetic video-priority UDP traffic did not automatically
activate low-latency mode, whereas voice-priority traffic did
(observed through the iwlmld debugfs state).

Include IEEE80211_AC_VI as intended,
matching behaviour of iwlmvm's iwl_mvm_calc_tcm_stats().
Explicitly specify the two values to match,
avoiding such issues from enum value comparison in the future.

Fixes: d1e879ec600f ("wifi: iwlwifi: add iwlmld sub-driver")
Signed-off-by: Endrik Einberg <git@endrik.dev>
---
Changes in v2:
- Match IEEE80211_AC_VO and _VI explicitly, as suggested by Miri.
- Describe how the issue was discovered and confirmed.

 drivers/net/wireless/intel/iwlwifi/mld/low_latency.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mld/low_latency.c b/drivers/net/wireless/intel/iwlwifi/mld/low_latency.c
index a4ddc32e2860..e7482623111c 100644
--- a/drivers/net/wireless/intel/iwlwifi/mld/low_latency.c
+++ b/drivers/net/wireless/intel/iwlwifi/mld/low_latency.c
@@ -257,7 +257,8 @@ static bool iwl_mld_is_vo_vi_pkt(struct ieee80211_hdr *hdr)
 	if (tid >= IWL_MAX_TID_COUNT)
 		return false;
 
-	return tid_to_mac80211_ac[tid] < IEEE80211_AC_VI;
+	return tid_to_mac80211_ac[tid] == IEEE80211_AC_VI ||
+	       tid_to_mac80211_ac[tid] == IEEE80211_AC_VO;
 }
 
 void iwl_mld_low_latency_update_counters(struct iwl_mld *mld,
-- 
2.53.0