[PATCH 0/3] BOOTP/DHCPv4 enhancements

[seanedmond@linux.microsoft.com]

From: Sean Edmond <seanedmond@microsoft.com>

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)

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(-)

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2.40.0