Hi Nishant,

Our application runs on top of DPDK-21.11 with net_i40e PMD(X710 NIC).

After running traffic for some days(8 to 10 days), intermittently we could see Tx-shall on Queue-0(we had enabled only a single queue) and this was identified by looking into the Rx/Tx eth-stats of NIC, where we could see Tx-packets stats was not incremented and only Rx-stats were incremented and the 'rte_eth_tx_burst()', this function returns '0'.

Work-arounds: Monitor this Rx/Tx stats for every second in an other thread and do the following steps:

1) Restart the PMD. using rte_eth_dev_stop(port) , usleep(10) and rte_eth_dev_start().

2) Restart the respective Tx Queue-0 only, which got stalled, by using rte_eth_dev_tx_queue_stop() and rte_eth_dev_tx_queue_start().

First approach takes a long time(around 10 seconds) to recover the NIC. whereas the second approach recovers within < 3 seconds.

Regards,

Madhukar.

On Thu, May 18, 2023 at 5:34 PM Nishant Verma <vnish11@gmail.com> wrote:

Hi Madhukar,

Can you please elaborate what issue you found in TX-side? Any solution for that?
For me it seems to be both rx and tx.

Thanks.

Regards,
Nishant Verma

On Mon, May 8, 2023 at 2:53 AM madhukar mythri <madhukar.mythri@gmail.com> wrote:
Hi,

We are facing an issue at the Transmit side randomly after 8 to 10 days of network traffic flow on the Intel X710 10G NIC with i40e PMD.
We found the issue is at Transmit side Tx-queue, as the Tx packets were not going out and also observed that the Tx-queue stats were not incrementing, even though we are sending packets out through the 'rte_eth_tx_burst()', this function returns '0'. Whereas the Rx-packets were received well at the same-time and Rx-stats were incremented well, even the NIC Link is also stable at 1G speed.

So, has anyone faced such issue on this DPDK i40e PMD at Transmit side(Tx-queue), if so, please let us know, if any known-issue 'Or' fix/work-around on this.

DPDK-version: DPDK-21.11
X710 NIC speed: Connected with 1G speed switch-port. so, as per auto-negotiation the link-speed is 1G only.
X710 NIC firmware-version: "fw 6.0.48442 api 1.7 nvm 6.01 0x80003b43 1.1824.0 [8086:1589] [108e:7b1c]".

Thanks,
Madhukar.