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 39F19C4332F for ; Sat, 4 Nov 2023 01:03:20 +0000 (UTC) Received: from h2850616.stratoserver.net (localhost [IPv6:::1]) by phobos.denx.de (Postfix) with ESMTP id 733CB8757D; Sat, 4 Nov 2023 02:01:48 +0100 (CET) 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="oQ6QVSE+"; dkim-atps=neutral Received: by phobos.denx.de (Postfix, from userid 109) id C66F187450; Sat, 4 Nov 2023 02:00:45 +0100 (CET) Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by phobos.denx.de (Postfix) with ESMTP id 4AC8787252 for ; Sat, 4 Nov 2023 02:00:22 +0100 (CET) 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 7703920B74C0; Fri, 3 Nov 2023 18:00:20 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 7703920B74C0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1699059620; bh=7B6JK6rwxPY4YKxMD/7jRDVjNa3jWi48Qh624aPDFAA=; h=From:To:Cc:Subject:Date:From; b=oQ6QVSE+HXnLUU0Ui3GnMZ6oNom6+KFzTWTzXl5SddXL7Xz8FfdqwnpJ7co+rp5Y/ hBME/MB09oeCNEQB9nQhbywoWerzO3MYbrHUmVj82+in3qAfwYmGNeB/RP8Po3aKIp F3l8cIHuADfqTsxaLSe1cgjTaPm6jHoxI1vDcnO0= From: seanedmond@linux.microsoft.com To: u-boot@lists.denx.de Cc: xypron.glpk@gmx.de, joe.hershberger@ni.com, rfried.dev@gmail.com, sjg@chromium.org, ilias.apalodimas@linaro.org Subject: [PATCH v3 0/3] BOOTP/DHCPv4 enhancements Date: Fri, 3 Nov 2023 18:00:02 -0700 Message-ID: <20231104010005.2483397-1-seanedmond@linux.microsoft.com> X-Mailer: git-send-email 2.42.0 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 v3: - add define for option 209 and rfc5071 reference - Set RETRANSMIT_PERIOD_MAX_MS=60000 - Add randomization factor to retransmission timeout - Add depends for BOOTP_RANDOM_XID 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 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 | 93 ++++++++++++++++++++++++++++++++++++++++++++--------- net/bootp.h | 2 ++ 4 files changed, 101 insertions(+), 15 deletions(-) -- 2.42.0