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TMS570LS3137 EMAC的QoS

user6263934
Prodigy 130 points
Other Parts Discussed in Thread: TMS570LS3137

TMS570LS3137 的TRM的EMAC feature中提到八条接收发送channels支持接收发送QoS。但是在Code Generator的配置中显示只支持配置一个通道。

如果支持多个通道，那么在描述发送功能时，假如使能了4个发送通道，那么DMA如何选择向哪个通道发送数据？在描述接收功能时，假如使能了4个接收通道，DMA是如何选择接收哪个通道的数据？接收QoS是如何体现的？

  • 0
    TI__Guru**** 252096 points

    Hardware QOS is enabled by the RXQOSEN bit in the receive multicast/broadcast/promiscuous channel enable register (RXMBPENABLE).

    您可以看一下用户指南的

    29.5.21 Receive Multicast/Broadcast/Promiscuous Channel Enable Register (RXMBPENABLE)  的 RXMULTEN 

    以及

    29.2.11.4 Hardware Receive QOS Support

    另外请您参考这个帖子

  • 0 回复 Susan Yang
    Prodigy 130 points
    Q1。现在的HAL Code Generator中只可以配置使能某一个channel，那么EMAC确实是只能使用某一个配置的通道的？不存在使能多个通道的情况吗？
    Q2。接收QoS，如何控制DMA去读哪一个通道？
    Q3。发送QoS，如何控制DMA去向哪一个通道发送数据？
  • 0 回复 user6263934
    TI__Guru**** 252096 points
    我在E2E发了帖子，您可以参考相关的回复

    e2e.ti.com/.../3523333

    Please refer to in the TRM: 32.2.11.4 Hardware Receive QOS Support

    It looks like hardware ignores the ID portion of the tag, and just uses the priority bits (TCI = Traffic Class ID = priority bits), therefore we think that ID cannot be used in packet classification. Priority bits can be used to implement quality of service on receive where lower priority packets (TCI = 0 - 3 we think) will be dropped if there isn’t enough buffering available. Priority bits aren’t used to pick RX channel as far as we can tell.
  • 0 回复 user6263934
    TI__Guru**** 252096 points

    请问您现在情况如何？以下是国外专家的回复原文：

    It looks like hardware ignores the ID portion of the tag, and just uses the priority bits (TCI = Traffic Class ID = priority bits), therefore we think that ID cannot be used in packet classification. Priority bits can be used to implement quality of service on receive where lower priority packets (TCI = 0 - 3 we think) will be dropped if there isn’t enough buffering available. Priority bits aren’t used to pick RX channel as far as we can tell.