[DPDK/ethdev Bug 1666] It is not possible to increase the MTU for AF_PACKET PMD beyond 1500B

[bugzilla@dpdk.org]

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https://bugs.dpdk.org/show_bug.cgi?id=1666

            Bug ID: 1666
           Summary: It is not possible to increase the MTU for AF_PACKET
                    PMD beyond 1500B
           Product: DPDK
           Version: 21.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: angelo.mirabella96@gmail.com
  Target Milestone: ---

Created attachment 302
  --> https://bugs.dpdk.org/attachment.cgi?id=302&action=edit
testpmd logs

Hi everyone,

I'm currently working with DPDK v21.11 from the official Ubuntu Jammy package,
having recently upgraded from v19.11. I noticed that a new check,
"eth_dev_validate_mtu", has been introduced in "eth_dev_configure".

The final check in this function is:


```
        if (frame_size > dev_info->max_rx_pktlen) {
---
```

For the AF_PACKET PMD, "max_rx_pktlen" is hardcoded to RTE_ETHER_MAX_LEN
(1518). As a result, any attempt to increase the MTU beyond 1500 fails, even
when the vdev is configured with a larger framesz.

I've attached logs from testpmd for reference. Any insights or possible
workarounds would be appreciated!

Thanks!

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