Re: ixgbe rxq interrupt not working

[Rajasekhar Pulluru <pullururajasekhar@gmail.com>]

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No Honnappa.

Thanks & Regards,
Rajasekhar

On Wed, Mar 8, 2023 at 5:49 AM Honnappa Nagarahalli <
Honnappa.Nagarahalli@arm.com> wrote:

>
>
> From: Rajasekhar Pulluru <pullururajasekhar@gmail.com>
> Sent: Tuesday, March 7, 2023 12:52 PM
> To: dev@dpdk.org
> Subject: ixgbe rxq interrupt not working
>
> Hi Team,
>
> Bringing-up dpdk-22.07 on an intel machine with 8 ports, 4 of them driven
> by igb and the rest of the 4 ports driven by ixgbe.
> [Honnappa]  Do you have packets crossing between the 2 drivers?
>
>
> I am following the below sequence to initialize these ports:
>
> dev_conf.intr_conf.lsc = 1; //Enable link state change interrupt
> dev_conf.intr_conf.rxq = 1; //Enable RX Queue Interrupt
> dev_conf.rxmode.mq_mode = RTE_ETH_MQ_RX_NONE;
> dev_conf.rxmode.offloads = 0;
> dev_conf.txmode.mq_mode = RTE_ETH_MQ_TX_NONE;
> dev_conf.txmode.offloads = 0;
>
> rte_eth_dev_configure
> rte_eth_rx_queue_setup
> rte_eth_tx_queue_setup
> rte_eth_dev_start
> data = port_id << CHAR_BIT | queue_id;
> rte_eth_dev_rx_intr_ctl_q(port_id, queue_id, RTE_EPOLL_PER_THREAD,
> RTE_INTR_EVENT_ADD, (void *)((uintptr_t)data));
> rte_eth_dev_rx_intr_enable(port_id, queue_id);
>
> And then main loop repeats the below:
>
> rte_epoll_wait(RTE_EPOLL_PER_THREAD, event, 1, timeout /* 200micro-sec
> */); /* ignore return value */
> rte_eth_dev_rx_intr_disable(port_id, queue_id);
> rte_eth_rx_burst(port_id, queue_id, pkts, num_pkts);
> rte_eth_dev_rx_intr_enable(port_id, queue_id);
>
> The code is same for all the ports, igb ports are able to come-up and rx
> packets, where-as the ixgbe ports are not able to rx packets at all.
> cat /proc/interrupts dumps vfio-msix counters for ixgbe as 0, where-as
> it's non-zero for igb.
> If I don't use/enable rxq interrupt for ixgbe (and remove epoll wait,
> interrupt enable/disable from while loop) and simply poll for
> rte_eth_rx_burst in a loop, ixgbe ports are able to rx packets.
>
> What could be wrong here? Appreciate any help.
>
> I would also like to know if there's an asynchronous rxq interrupt
> notification to the application instead of rte_epoll_wait (and sleep).
>
> Thanks & Regards,
> Rajasekhar
>

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