qedentv - RSS feature support in Multi-function Mode
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qedentv - RSS feature support in Multi-function Mode

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Article ID: 313170

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Updated On:

Products

VMware vSphere ESXi

Issue/Introduction

  • RSS (DefQ_RSS and NetQ_RSS) feature queues are not being utilized by qedentv driver when NIC is configured in multi-function mode.
  • In Multi-function mode (switch dependent or switch independent), RSS feature is supported only on first four PCI functions if there are enough system and adapter resources available.
  • This is the reason RSS queues are not utilized on remaining PCI functions. In SR-IOV over Multi-function configuration, RSS is not supported on any PCI function.
  • The first four functions of driver qedentv, which will have RSS feature enabled can be seen using the below command:
    # zcat /var/log/boot.gz | grep QueuesRunningConfig
    [YYYY-MM-DDTHH:MM:SS] cpu7:2098062)[qedentv_init_edev:1504(0000:21:00.0)]QueuesRunningConfig: max_rxq:20, max_txq:20, max_tc:1, max_rss:4, total_filters:64, fltrs_per_q:2, num_defq_rss_count:0
    [YYYY-MM-DDTHH:MM:SS] cpu7:2098062)[qedentv_init_edev:1504(0000:21:00.1)]QueuesRunningConfig: max_rxq:20, max_txq:20, max_tc:1, max_rss:4, total_filters:64, fltrs_per_q:2, num_defq_rss_count:0
    [YYYY-MM-DDTHH:MM:SS] cpu7:2098062)[qedentv_init_edev:1504(0000:21:00.2)]QueuesRunningConfig: max_rxq:20, max_txq:20, max_tc:1, max_rss:4, total_filters:64, fltrs_per_q:2, num_defq_rss_count:0
    [YYYY-MM-DDTHH:MM:SS] cpu7:2098062)[qedentv_init_edev:1504(0000:21:00.3)]QueuesRunningConfig: max_rxq:20, max_txq:20, max_tc:1, max_rss:4, total_filters:64, fltrs_per_q:2, num_defq_rss_count:0
    [YYYY-MM-DDTHH:MM:SS] cpu7:2098062)[qedentv_init_edev:1504(0000:21:00.4)]QueuesRunningConfig: max_rxq:2, max_txq:2, max_tc:1, max_rss:0, total_filters:64, fltrs_per_q:2, num_defq_rss_count:0
    [YYYY-MM-DDTHH:MM:SS] cpu7:2098062)[qedentv_init_edev:1504(0000:21:00.5)]QueuesRunningConfig: max_rxq:2, max_txq:2, max_tc:1, max_rss:0, total_filters:64, fltrs_per_q:2, num_defq_rss_count:0
    [YYYY-MM-DDTHH:MM:SS] cpu7:2098062)[qedentv_init_edev:1504(0000:21:00.6)]QueuesRunningConfig: max_rxq:2, max_txq:2, max_tc:1, max_rss:0, total_filters:64, fltrs_per_q:2, num_defq_rss_count:0
    [YYYY-MM-DDTHH:MM:SS] cpu7:2098062)[qedentv_init_edev:1504(0000:21:00.7)]QueuesRunningConfig: max_rxq:2, max_txq:2, max_tc:1, max_rss:0, total_filters:64, fltrs_per_q:2, num_defq_rss_count:0

  • If storage is enabled then RSS will be enabled in first two functions only, as later two will be used for storage purpose.

Resolution

This is expected behaviour.

Recommendation

  • As RSS is only supported on first four PCI functions, it is recommended to use the first four PCI functions for those workloads that need RSS to be enabled.
  • If feasible, another option could be to use Single Function mode.

Additional Information

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