[PATCH] net/mlx5: update stored Rx queue MTU when port MTU changes

[Adrian Schollmeyer]

Hi,

Am Montag, dem 17.11.2025 um 09:39 +0200 schrieb Shani Peretz:
> Offending commit added rxq_ctrl->mtu to track MTU at queue
> allocation time for validating shared RX queue compatibility.
> 
> When MTU changes via rte_eth_dev_set_mtu(), only priv->mtu was
> updated, leaving rxq_ctrl->mtu with the old value.

If you read the commit message of the offending patch, this was in fact
intentional. The MTU at allocation time is relevant when joining a Rx
share group, as it is (to the best of my knowledge) the only MTU
setting that actually has an influence on the size of the packet
buffers. Therefore, it is the value which is relevant for sharing
packet buffers.

I've tested your patch again with the prototype I used to discover the
original bug and unfortunately it reappears.

Best regards,
Adrian

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Adrian Schollmeyer

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