Can dpdk rx interrupts work in secondary process

[jinag]

Hi matan and thomas:
When I call rte_eth_dev_rx_intr_ctl_q in secondary process, I found dev->intr_handle->intr_vec is NULL.
https://github.com/DPDK/dpdk/blob/v19.11/lib/librte_ethdev/rte_ethdev.c#L4120
I wonder if this is a bug or rx interrupts can't work in secondary prcess.
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