Re: [RFC PATCH 4/5] tcp, udp: Pad batched frames to 60 bytes (802.3 minimum) in non-vhost-user modes

[Laurent Vivier <lvivier@redhat.com>]

On 11/3/25 11:16, Stefano Brivio wrote:
> Add a further iovec frame part, TCP_IOV_ETH_PAD for TCP and
> UDP_IOV_ETH_PAD for UDP, after the payload, make that point to a
> zero-filled buffer, and send out a part of it if needed to reach
> the minimum frame length given by 802.3, that is, 60 bytes altogether.
> 
> The frames we might need to pad are IPv4 only (the IPv6 header is
> larger), and are typically TCP ACK segments but can also be small
> data segments or datagrams.
> 
> Link: https://bugs.passt.top/show_bug.cgi?id=166
> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
> ---
>   tcp_buf.c      | 23 +++++++++++++++++++++++
>   tcp_internal.h |  2 ++
>   udp.c          | 21 +++++++++++++++++++++
>   util.c         |  3 +++
>   util.h         |  3 +++
>   5 files changed, 52 insertions(+)
> 

Reviewed-by: Laurent Vivier <lvivier@redhat.com>