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wifi: AP MLDs process TID-to-Link Mapping IEs in AssocReq frames

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This commit is contained in:
Stefano Avallone
2023-05-17 17:07:45 +02:00
parent a36de7eafe
commit a8bcedbb06
1 changed files with 106 additions and 4 deletions
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110
src/wifi/model/ap-wifi-mac.cc
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@@ -1102,6 +1102,10 @@ ApWifiMac::GetAssocResp(Mac48Address to, uint8_t linkId)
{
assoc.Get<EhtCapabilities>() = GetEhtCapabilities(linkId);
assoc.Get<EhtOperation>() = GetEhtOperation(linkId);
// The AP MLD that accepts the requested TID-to-link mapping shall not include in the
// (Re)Association Response frame the TID-to-link Mapping element.
// (Sec. 35.3.7.1.8 of 802.11be D3.1).
// For now, we assume that AP MLDs always accept requested TID-to-link mappings.
}
return assoc;
}
@@ -1485,6 +1489,9 @@ ApWifiMac::TxOk(Ptr<const WifiMpdu> mpdu)
StaSwitchingToPsMode(*staAddress, i);
}
}
// Apply the negotiated TID-to-Link Mapping (if any) for DL direction
ApplyTidLinkMapping(*staMldAddress, WifiDirection::DOWNLINK);
}
}
else if (hdr.IsAction())
@@ -1911,9 +1918,105 @@ ApWifiMac::ReceiveAssocRequest(const AssocReqRefVariant& assoc,
}
if (GetEhtSupported())
{
// check whether the EHT STA supports all MCSs in Basic MCS Set
// const auto& ehtCapabilities = frame.GetEhtCapabilities ();
// TODO: to be completed
// TODO check whether the EHT STA supports all MCSs in Basic MCS Set
auto ehtConfig = GetEhtConfiguration();
NS_ASSERT(ehtConfig);
if (const auto& tidLinkMapping = frame.template Get<TidToLinkMapping>();
!tidLinkMapping.empty())
{
// non-AP MLD included TID-to-Link Mapping IE(s) in the Association Request.
// We refuse association if we do not support TID-to-Link mapping negotiation
// or the non-AP MLD included more than two TID-to-Link Mapping IEs
// or we support negotiation type 1 but TIDs are mapped onto distinct link sets
// or there is some TID that is not mapped to any link
// or the direction(s) is/are not set properly
if (tidLinkMapping.size() > 2)
{
return failure("More than two TID-to-Link Mapping IEs");
}
// if only one Tid-to-Link Mapping element is present, it must be valid for
// both directions
bool bothDirIfOneTlm =
tidLinkMapping.size() != 1 ||
tidLinkMapping[0].m_control.direction == WifiDirection::BOTH_DIRECTIONS;
// An MLD that includes two TID-To-Link Mapping elements in a (Re)Association
// Request frame or a (Re)Association Response frame shall set the Direction
// subfield in one of the TID-To-Link Mapping elements to 0 and the Direction
// subfield in the other TID-To- Link Mapping element to 1.
// (Sec. 35.3.7.1.8 of 802.11be D3.1)
bool distinctDirsIfTwoTlms =
tidLinkMapping.size() != 2 ||
(tidLinkMapping[0].m_control.direction != WifiDirection::BOTH_DIRECTIONS &&
tidLinkMapping[1].m_control.direction != WifiDirection::BOTH_DIRECTIONS &&
tidLinkMapping[0].m_control.direction !=
tidLinkMapping[1].m_control.direction);
if (!bothDirIfOneTlm || !distinctDirsIfTwoTlms)
{
return failure("Incorrect directions in TID-to-Link Mapping IEs");
}
EnumValue negSupport;
ehtConfig->GetAttributeFailSafe("TidToLinkMappingNegSupport", negSupport);
if (negSupport.Get() == 0)
{
return failure("TID-to-Link Mapping negotiation not supported");
}
auto getMapping = [](const TidToLinkMapping& tlmIe, WifiTidLinkMapping& mapping) {
if (tlmIe.m_control.defaultMapping)
{
return;
}
for (uint8_t tid = 0; tid < 8; tid++)
{
if (auto linkSet = tlmIe.GetLinkMappingOfTid(tid); !linkSet.empty())
{
mapping.emplace(tid, std::move(linkSet));
}
}
};
WifiTidLinkMapping dlMapping;
WifiTidLinkMapping ulMapping;
switch (tidLinkMapping[0].m_control.direction)
{
case WifiDirection::BOTH_DIRECTIONS:
getMapping(tidLinkMapping.at(0), dlMapping);
ulMapping = dlMapping;
break;
case WifiDirection::DOWNLINK:
getMapping(tidLinkMapping.at(0), dlMapping);
getMapping(tidLinkMapping.at(1), ulMapping);
break;
case WifiDirection::UPLINK:
getMapping(tidLinkMapping.at(0), ulMapping);
getMapping(tidLinkMapping.at(1), dlMapping);
break;
}
if (negSupport.Get() == 1 &&
!TidToLinkMappingValidForNegType1(dlMapping, ulMapping))
{
return failure("Mapping TIDs to distinct link sets is incompatible with "
"negotiation support of 1");
}
// otherwise, we accept the TID-to-link Mapping and store it
const auto& mle = frame.template Get<MultiLinkElement>();
NS_ASSERT_MSG(mle,
"Multi-Link Element not present in an Association Request including "
"TID-to-Link Mapping element(s)");
auto mldAddr = mle->GetMldMacAddress();
// The requested link mappings are valid and can be accepted; store them.
UpdateTidToLinkMapping(mldAddr, WifiDirection::DOWNLINK, dlMapping);
UpdateTidToLinkMapping(mldAddr, WifiDirection::UPLINK, ulMapping);
}
}
// The association request from the station can be accepted.
@@ -1994,7 +2097,6 @@ ApWifiMac::ReceiveAssocRequest(const AssocReqRefVariant& assoc,
NS_LOG_DEBUG("Association Request from " << from << " accepted");
remoteStationManager->RecordWaitAssocTxOk(from);
return true;
;
};
return std::visit(recvAssocRequest, assoc);