From: bugzilla@dpdk.org
To: dev@dpdk.org
Subject: [DPDK/ethdev Bug 1666] It is not possible to increase the MTU for AF_PACKET PMD beyond 1500B
Date: Fri, 28 Feb 2025 12:03:48 +0000 [thread overview]
Message-ID: <bug-1666-3@http.bugs.dpdk.org/> (raw)
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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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