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- Implementation of Receive function for packets - Implementation for reading and writing from and to descriptors in memory for Rx When RX starts, we need to flush the queued packets so that they can be received by the GMAC device. Without this it won't work with TAP NIC device. When RX descriptor list is full, it returns a DMA_STATUS for software to handle it. But there's no way to indicate the software has handled all RX descriptors and the whole pipeline stalls. We do something similar to NPCM7XX EMC to handle this case. 1. Return packet size when RX descriptor is full, effectively dropping these packets in such a case. 2. When software clears RX descriptor full bit, continue receiving further packets by flushing QEMU packet queue. Added relevant trace-events Change-Id: I132aa254a94cda1a586aba2ea33bbfc74ecdb831 Signed-off-by: Hao Wu <wuhaotsh@google.com> Signed-off-by: Nabih Estefan <nabihestefan@google.com> Reviewed-by: Tyrone Ting <kfting@nuvoton.com> Message-id: 20240131002800.989285-5-nabihestefan@google.com Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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