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wifi: AP blocks TX to EMLSR clients holding a TXOP on another link

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This commit is contained in:
Stefano Avallone
2024-02-01 23:45:25 +01:00
parent 0a4a96f459
commit c60eb0208d
1 changed files with 65 additions and 0 deletions
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65
src/wifi/model/eht/eht-frame-exchange-manager.cc
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@@ -177,6 +177,71 @@ EhtFrameExchangeManager::StartTransmission(Ptr<Txop> edca, uint16_t allowedWidth
{
NS_LOG_FUNCTION(this << edca << allowedWidth);
if (m_apMac)
{
for (uint8_t linkId = 0; linkId < m_apMac->GetNLinks(); linkId++)
{
if (linkId == m_linkId)
{
continue;
}
// EMLSR clients involved in a DL or UL TXOP on another link
std::set<Mac48Address> emlsrClients;
// check if an EMLSR client is the holder of an UL TXOP on the other link
if (auto ehtFem =
StaticCast<EhtFrameExchangeManager>(m_mac->GetFrameExchangeManager(linkId));
ehtFem->m_ongoingTxopEnd.IsRunning() && ehtFem->m_txopHolder &&
m_mac->GetWifiRemoteStationManager(linkId)->GetEmlsrEnabled(
ehtFem->m_txopHolder.value()))
{
emlsrClients.insert(ehtFem->m_txopHolder.value());
}
// check if EMLSR clients are involved in a DL TXOP on another link
for (const auto& address : m_protectedStas)
{
if (m_mac->GetWifiRemoteStationManager(linkId)->GetEmlsrEnabled(address))
{
emlsrClients.insert(address);
}
}
for (const auto& address : emlsrClients)
{
auto mldAddress =
m_mac->GetWifiRemoteStationManager(linkId)->GetMldAddress(address);
NS_ASSERT_MSG(mldAddress, "MLD address not found for " << address);
if (!GetWifiRemoteStationManager()->GetEmlsrEnabled(*mldAddress))
{
// EMLSR client did not enable EMLSR mode on this link, we can transmit to it
continue;
}
// check that this link is blocked as expected
WifiContainerQueueId queueId(WIFI_QOSDATA_QUEUE, WIFI_UNICAST, *mldAddress, 0);
auto mask =
m_apMac->GetMacQueueScheduler()->GetQueueLinkMask(AC_BE, queueId, m_linkId);
NS_ASSERT_MSG(mask,
"No mask for client " << *mldAddress << " on link " << +m_linkId);
if (!mask->test(
static_cast<std::size_t>(WifiQueueBlockedReason::USING_OTHER_EMLSR_LINK)))
{
NS_ASSERT_MSG(false,
"Transmissions to " << *mldAddress << " on link " << +m_linkId
<< " are not blocked");
// in case asserts are disabled, block transmissions on the other links because
// this is what we need
m_mac->BlockUnicastTxOnLinks(WifiQueueBlockedReason::USING_OTHER_EMLSR_LINK,
*mldAddress,
{m_linkId});
}
}
}
}
std::optional<Time> timeToCtsEnd;
if (m_staMac && m_staMac->IsEmlsrLink(m_linkId))