From: Stephen Hemminger <stephen@networkplumber.org>
To: Rajasekhar Pulluru <pullururajasekhar@gmail.com>
Cc: dev@dpdk.org
Subject: Re: Restrict max packet size on rx
Date: Fri, 18 Oct 2024 09:43:48 -0700 [thread overview]
Message-ID: <20241018094348.4e91b6e5@hermes.local> (raw)
In-Reply-To: <CAGA5_H4auz9x2qe5EvYH48f+0zstnxpeRHHpWWbBMCVQj7V8BA@mail.gmail.com>
On Fri, 18 Oct 2024 22:05:24 +0530
Rajasekhar Pulluru <pullururajasekhar@gmail.com> wrote:
> Team,
> Does setting mtu using rte_eth_dev_set_mtu limit the maximum size of the
> packet received on the dpdk port to the configured mtu size?
>
> On an intel machine with ixgbe port, with mtu set to 1500, no rx-offloads
> enabled, ixgbe dpdk port is able to receive packets greater than 1500 size
> and even jumbo frames of size 9000, even though the peer is sending them
> fragmented with mtu of 1500.
>
> How do I restrict the port not to receive any frame greater than mtu size?
>
> Appreciate any help,
> Thanks.
> Rajasekhar
In networking, MTU and MRU are overlapping concepts.
The MTU value is used as a hint to the driver as to what size buffer to allocate
but it can use larger if it wants. If you have restrictions, then the application
needs to enforce them.
next prev parent reply other threads:[~2024-10-18 16:43 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-18 16:35 Rajasekhar Pulluru
2024-10-18 16:43 ` Stephen Hemminger [this message]
2024-10-18 16:49 ` Rajasekhar Pulluru
2024-10-18 17:37 ` Stephen Hemminger
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