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

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 --- 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