i40e PMD: Tx hang issue

[madhukar mythri]

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.
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