[PATCH 0/3] BOOTP/DHCPv4 enhancements

[Peter Robinson]

Hi Sean,

> In our datacenter application, a single DHCP server is servicing 36000+ clients.
> Improvements are required to the DHCPv4 retransmission behavior to align with
> RFC and ensure less pressure is exerted on the server:
> - retransmission backoff interval maximum is configurable
>   (environment variable bootpretransmitperiodmax)
> - initial retransmission backoff interval is configurable
>   (environment variable bootpretransmitperiodinit)
> - transaction ID is kept the same for each BOOTP/DHCPv4 request
>   (not recreated on each retry)

Might be also worth looking at the series adding LWIP support [1] and
see what impact that may have on this too.

Peter

[1] https://lists.denx.de/pipermail/u-boot/2023-September/531716.html

> For our application we'll use:
> - bootpretransmitperiodmax=16000
> - bootpretransmitperiodinit=2000
>
> A new configuration BOOTP_RANDOM_XID has been added to enable a randomized
> BOOTP/DHCPv4 transaction ID.
>
> Add functionality for DHCPv4 sending/parsing option 209 (PXE config file).
> Enabled with Kconfig BOOTP_PXE_DHCP_OPTION.  Note, this patch was
> submitted previously but this latest version has been enhanced to
> avoid a possible double free().
>
> Sean Edmond (3):
>   net: Get pxe config file from dhcp option 209
>   net: bootp: BOOTP/DHCPv4 retransmission improvements
>   net: bootp: add config option BOOTP_RANDOM_XID
>
>  cmd/Kconfig | 11 +++++++
>  cmd/pxe.c   | 10 +++++++
>  net/bootp.c | 85 +++++++++++++++++++++++++++++++++++++++++++----------
>  3 files changed, 91 insertions(+), 15 deletions(-)
>
> --
> 2.40.0
>