fyi - vmxnet3 maintainer Jochen On 19/09/2025 21:15, [email protected] wrote: > https://bugs.dpdk.org/show_bug.cgi?id=1789 > > Bug ID: 1789 > Summary: vmxnet3_dev_start fails in vmxnet3_v4_rss_configure() > for single queue in ESX8.0 causing application to exit > Product: DPDK > Version: 19.11 > Hardware: All > OS: All > Status: UNCONFIRMED > Severity: normal > Priority: Normal > Component: ethdev > Assignee: [email protected] > Reporter: [email protected] > Target Milestone: --- > > DPDK Version: 19.11 > ESX version: ESX8.0 > > We faced an exact similar issue as mentioned in > https://mails.dpdk.org/archives/users/2025-April/008236.html. > > Context Details: > ----------------- > In ESXi 8.0 setup with dpdk-19.11, when the HW compatibility version is ESX8.0 > and with single queue pair configuration, the RSS gets enabled. As a result, > vmxnet3_v4_rss_configure() gets called and fails while writing/reading from > BAR1 hw register. It looks to be some compatibility issue with dpdk-19.11 and > ESX8.0. > > if (VMXNET3_VERSION_GE_4(hw) && > > dev->data->dev_conf.rxmode.mq_mode == ETH_MQ_RX_RSS) { > > /* Check for additional RSS */ > > ret = vmxnet3_v4_rss_configure(dev); > > if (ret != VMXNET3_SUCCESS) { > > PMD_INIT_LOG(ERR, "Failed to configure v4 RSS"); > > return ret; > > } > > } > > As a result, it causes the application to exit. > > Proposed fix: > I have a plausible fix for this. The fix is to disable RSS for such a case ( > the fix should go only in 19.11). During dev_configure(), we can set the > mq_mode to ETH_MQ_RX_NONE if the num_rx_queues is 1. This would avoid calling > of vmxnet3_v4_rss_configure(). > > > /* Disabling RSS for single queue pair */ > > if (dev->data->nb_rx_queues == 1) { > > dev->data->dev_conf.rxmode.mq_mode = ETH_MQ_RX_NONE; > > PMD_INIT_LOG(ERR, "WARN: Disabling RSS for single Rx queue"); > > } > > > Pls verify and let me know if it can be upstreamed. Once confirmed/approved, > If > required, I can generate a main stream patch for it. >
