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wifi: Block channel access when aux PHYs change channel width

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This commit is contained in:
Stefano Avallone
2023-11-23 19:00:23 +01:00
committed by Stefano Avallone
parent 8c0bb0b2a3
commit 151316ce68
1 changed files with 14 additions and 10 deletions
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24
src/wifi/model/eht/emlsr-manager.cc
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@@ -926,19 +926,23 @@ EmlsrManager::ApplyMaxChannelWidthAndModClassOnAuxPhys()
auto cam = m_staMac->GetChannelAccessManager(linkId);
cam->NotifySwitchingEmlsrLink(auxPhy, channel, linkId);
void (WifiPhy::*fp)(const WifiPhyOperatingChannel&) = &WifiPhy::SetOperatingChannel;
Simulator::ScheduleNow(fp, auxPhy, channel);
auxPhy->SetOperatingChannel(channel);
// the way the ChannelAccessManager handles EMLSR link switch implies that a PHY listener
// is removed when the channel switch starts and another one is attached when the channel
// switch ends. In the meantime, no PHY is connected to the ChannelAccessManager. Inform
// the ChannelAccessManager that this channel switch is related to EMLSR operations, so
// that the ChannelAccessManager does not complain if events requiring access to the PHY
// occur during the channel switch.
cam->NotifyStartUsingOtherEmlsrLink();
Simulator::Schedule(auxPhy->GetChannelSwitchDelay(),
&ChannelAccessManager::NotifyStopUsingOtherEmlsrLink,
cam);
// switch ends. In the meantime, no PHY is connected to the ChannelAccessManager. Thus,
// reset all backoffs (so that access timeout is also cancelled) when the channel switch
// starts and request channel access (if needed) when the channel switch ends.
cam->ResetAllBackoffs();
Simulator::Schedule(auxPhy->GetChannelSwitchDelay(), [=, this]() {
for (const auto& [acIndex, ac] : wifiAcList)
{
m_staMac->GetQosTxop(acIndex)->StartAccessAfterEvent(
linkId,
Txop::DIDNT_HAVE_FRAMES_TO_TRANSMIT,
Txop::CHECK_MEDIUM_BUSY);
}
});
}
}