Adaptec 1737100 Programmer Manual - Page 188
TxComQConsumerIndex %= AIC6915_NUMBER_OF_TX_COMPLETION_DESC
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Page 188 highlights
AIC-6915 Ethernet LAN Controller Programmer's Manual // The index is a multiple of the size of the Transmit Buffer Descriptor. IndexToDescriptor = TxCompletionDesc->ConsumerIndex/ sizeof(AIC6915_TX_DESC); TxDesc = Adapter->TxDesc[IndexToDescriptor]; // Return the packet to the operating system. // This is the packet given to us by the operating system when the // transmit was first initiated. The packet was stored in the skip field // at that time. NdisMSendComplete( Adapter->MiniportAdapterHandle, TxDesc->Reserved.OwningPacket, NDIS_STATUS_SUCCESS ); TxComQConsumerIndex++; TxComQConsumerIndex %= AIC6915_NUMBER_OF_TX_COMPLETION_DESC; } // while (TxComQConsumerIndex != TxComQProducerIndex) // Give the Tx completion descriptors we've processed back to the AIC-6915. AIC6915_READ_REG(CompletionQ1ConsumerIndex, &CompletionQ1ConsumerReg); CompletionQ1ConsumerReg.TxCompletionConsumerIndex = TxComQConsumerIndex; AIC6915_WRITE_REG(CompletionQ1ConsumerIndex, CompletionQ1ConsumerReg); // We're finished with all Transmit Complete processing! 8-28