wifi: Decouple setup PHY/MAC and reset on remote station manager

src/wifi/model/wifi-mac.cc

@@ -587,10 +587,8 @@ WifiMac::NotifyChannelSwitching(uint8_t linkId)
     // the PHY dependent parameters. In any case, this makes no harm
     ConfigurePhyDependentParameters(linkId);
 
-    // SetupPhy not only resets the remote station manager, but also sets the
-    // default TX mode and MCS, which is required when switching to a channel
-    // in a different band
-    GetLink(linkId).stationManager->SetupPhy(GetLink(linkId).phy);
+    // Reset remote station manager
+    GetLink(linkId).stationManager->Reset();
 }
 
 void

src/wifi/model/wifi-remote-station-manager.cc

@@ -144,6 +144,8 @@ WifiRemoteStationManager::WifiRemoteStationManager()
       m_shortSlotTimeEnabled(false)
 {
     NS_LOG_FUNCTION(this);
+    m_ssrc.fill(0);
+    m_slrc.fill(0);
 }
 
 WifiRemoteStationManager::~WifiRemoteStationManager()
@@ -168,7 +170,6 @@ WifiRemoteStationManager::SetupPhy(const Ptr<WifiPhy> phy)
     // transmit rate for automatic control responses like
     // acknowledgments.
     m_wifiPhy = phy;
-    Reset();
 }
 
 void
@@ -178,7 +179,6 @@ WifiRemoteStationManager::SetupMac(const Ptr<WifiMac> mac)
     // We need to track our MAC because it is the object that knows the
     // full set of interframe spaces.
     m_wifiMac = mac;
-    Reset();
 }
 
 int64_t