From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from phobos.denx.de (phobos.denx.de [85.214.62.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DA1A1C00A8F for ; Tue, 24 Oct 2023 00:22:06 +0000 (UTC) Received: from h2850616.stratoserver.net (localhost [IPv6:::1]) by phobos.denx.de (Postfix) with ESMTP id 9651987769; Tue, 24 Oct 2023 02:22:04 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de Authentication-Results: phobos.denx.de; dkim=pass (1024-bit key; unprotected) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="EYK6maDC"; dkim-atps=neutral Received: by phobos.denx.de (Postfix, from userid 109) id 218A18794F; Tue, 24 Oct 2023 02:22:04 +0200 (CEST) Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by phobos.denx.de (Postfix) with ESMTP id 4E7CB8702C for ; Tue, 24 Oct 2023 02:22:01 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=seanedmond@linux.microsoft.com Received: from ovlvm106.redmond.corp.microsoft.com (unknown [131.107.147.185]) by linux.microsoft.com (Postfix) with ESMTPSA id F1C6920B74C0; Mon, 23 Oct 2023 17:21:59 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com F1C6920B74C0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1698106920; bh=OmS4SU12XNVAMHrPNUW+AnlDp640MPMAN6PWZ3esd90=; h=From:To:Cc:Subject:Date:From; b=EYK6maDC+aJsb/EqFplmbjCnZdMTO4W+tp1prq6AzTG7SY6upqUqkWkpPbedF4l/2 S/DbSIQyh71pEdpijODcttVVVHNI8IltidabCOFaMBIqDdmnLyZ5A2t/8mKS5Ojyvj ad3kweFs6PVDBb2ndJ8+bAxYoqgJsUN3aT8DmWkE= From: seanedmond@linux.microsoft.com To: u-boot@lists.denx.de Cc: joe.hershberger@ni.com, rfried.dev@gmail.com, sjg@chromium.org, xypron.glpk@gmx.de, ilias.apalodimas@linaro.org Subject: [PATCH v2 0/3] BOOTP/DHCPv4 enhancements Date: Mon, 23 Oct 2023 17:21:56 -0700 Message-Id: <20231024002159.74477-1-seanedmond@linux.microsoft.com> X-Mailer: git-send-email 2.40.0 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean From: Sean Edmond 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(). changes in v2: - use env_get_ulong() to get environment variables 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 | 78 ++++++++++++++++++++++++++++++++++++++++++----------- 3 files changed, 84 insertions(+), 15 deletions(-) -- 2.40.0