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[wireless-next,05/14] wifi: iwlwifi: mld: allow EMLSR on separated 5 GHz subbands

Message ID 20250424153620.d568a26661d5.Ie4277945272c5bbf637957704fda34ea03ef28d2@changeid
State New
Headers show
Series wifi: iwlwifi: updates - 2025-04-24 | expand

Commit Message

Miri Korenblit April 24, 2025, 12:38 p.m. UTC 
From: Johannes Berg <johannes.berg@intel.com>

If there are two links on 5 GHz subbands that are separated
enough (using channels 36-64 and 100+) then we can support
EMLSR across those two links. Allow that in the logic.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mld/mlo.c | 24 ++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/net/wireless/intel/iwlwifi/mld/mlo.c b/drivers/net/wireless/intel/iwlwifi/mld/mlo.c
index 8f7578bc46b1..da16fff1ce86 100644
--- a/drivers/net/wireless/intel/iwlwifi/mld/mlo.c
+++ b/drivers/net/wireless/intel/iwlwifi/mld/mlo.c
@@ -805,8 +805,28 @@  iwl_mld_valid_emlsr_pair(struct ieee80211_vif *vif,
 	    iwl_mld_emlsr_disallowed_with_link(mld, vif, b, false))
 		return false;
 
-	if (a->chandef->chan->band == b->chandef->chan->band)
-		reason_mask |= IWL_MLD_EMLSR_EXIT_EQUAL_BAND;
+	if (a->chandef->chan->band == b->chandef->chan->band) {
+		const struct cfg80211_chan_def *c_low = a->chandef;
+		const struct cfg80211_chan_def *c_high = b->chandef;
+		u32 c_low_upper_edge, c_high_lower_edge;
+
+		if (c_low->chan->center_freq > c_high->chan->center_freq)
+			swap(c_low, c_high);
+
+		c_low_upper_edge = c_low->chan->center_freq +
+				   cfg80211_chandef_get_width(c_low) / 2;
+		c_high_lower_edge = c_high->chan->center_freq -
+				    cfg80211_chandef_get_width(c_high) / 2;
+
+		if (a->chandef->chan->band == NL80211_BAND_5GHZ &&
+		    c_low_upper_edge <= 5330 && c_high_lower_edge >= 5490) {
+			/* This case is fine - HW/FW can deal with it, there's
+			 * enough separation between the two channels.
+			 */
+		} else {
+			reason_mask |= IWL_MLD_EMLSR_EXIT_EQUAL_BAND;
+		}
+	}
 	if (!iwl_mld_channel_load_allows_emlsr(mld, vif, a, b))
 		reason_mask |= IWL_MLD_EMLSR_EXIT_CHAN_LOAD;