On Fri, 18 Oct 2024 22:19:35 +0530 Rajasekhar Pulluru <pullururajasek...@gmail.com> wrote:
> Thanks Stephen. > > On Fri, Oct 18, 2024 at 10:13 PM Stephen Hemminger < > step...@networkplumber.org> wrote: > > > On Fri, 18 Oct 2024 22:05:24 +0530 > > Rajasekhar Pulluru <pullururajasek...@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. > > There are some drivers like ixgbe that need to round up the receive buffer to a power of 2. So it is possible to get 2K frames even with standard 1500 byte MTU.
