From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 1CD04462E6; Fri, 28 Feb 2025 13:03:50 +0100 (CET) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id B901B40E3F; Fri, 28 Feb 2025 13:03:49 +0100 (CET) Received: from inbox.dpdk.org (inbox.dpdk.org [95.142.172.178]) by mails.dpdk.org (Postfix) with ESMTP id 2162440609 for ; Fri, 28 Feb 2025 13:03:49 +0100 (CET) Received: by inbox.dpdk.org (Postfix, from userid 33) id EAB62462E7; Fri, 28 Feb 2025 13:03:48 +0100 (CET) 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 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: DPDK X-Bugzilla-Component: ethdev X-Bugzilla-Version: 21.11 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: angelo.mirabella96@gmail.com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: Normal X-Bugzilla-Assigned-To: dev@dpdk.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter target_milestone attachments.created Message-ID: Content-Type: multipart/alternative; boundary=17407442280.8dcc148.1469702 Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://bugs.dpdk.org/ Auto-Submitted: auto-generated X-Auto-Response-Suppress: All MIME-Version: 1.0 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org --17407442280.8dcc148.1469702 Date: Fri, 28 Feb 2025 13:03:48 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.dpdk.org/ Auto-Submitted: auto-generated X-Auto-Response-Suppress: All https://bugs.dpdk.org/show_bug.cgi?id=3D1666 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=3D302&action=3Dedit testpmd logs Hi everyone, I'm currently working with DPDK v21.11 from the official Ubuntu Jammy packa= ge, 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! --=20 You are receiving this mail because: You are the assignee for the bug.= --17407442280.8dcc148.1469702 Date: Fri, 28 Feb 2025 13:03:48 +0100 MIME-Version: 1.0 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.dpdk.org/ Auto-Submitted: auto-generated X-Auto-Response-Suppress: All
Bug ID 1666
Summary It is not possible to increase the MTU for AF_PACKET PMD beyo= nd 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 att=
achment 302 [details]
testpmd logs

Hi everyone,

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

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!

You are receiving this mail because:
  • You are the assignee for the bug.
=20=20=20=20=20=20=20=20=20=20
= --17407442280.8dcc148.1469702--