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 X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id ABA90C433DF for ; Fri, 24 Jul 2020 14:04:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 858B92065C for ; Fri, 24 Jul 2020 14:04:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=bytedance-com.20150623.gappssmtp.com header.i=@bytedance-com.20150623.gappssmtp.com header.b="TFEVryem" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726686AbgGXOEI (ORCPT ); Fri, 24 Jul 2020 10:04:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42992 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726607AbgGXOEH (ORCPT ); Fri, 24 Jul 2020 10:04:07 -0400 Received: from mail-pj1-x1044.google.com (mail-pj1-x1044.google.com [IPv6:2607:f8b0:4864:20::1044]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9B78EC0619D3 for ; Fri, 24 Jul 2020 07:04:06 -0700 (PDT) Received: by mail-pj1-x1044.google.com with SMTP id k71so5273720pje.0 for ; Fri, 24 Jul 2020 07:04:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=AumJku5mcZ/Rq/5BxLKNESx5aO3qoxwojN7ONDDAbDY=; b=TFEVryem3XPKwqBbyepWH433FI+5aCRAhpLBGqHqCpIadXaYX7NIT86SQ3qeRr2JMQ rrEn6nDAjkZMr3yaIFuMRuYjCNKbkaOBLzfvK5pGeBaLKRc2Ru5RqEsw3qkz2A9eWkGs UaTIcxTraDDBfIWoHjlZ1/aWcvqwZgQkfKlFRQQlBzol9rgRuDNOlRnCXBi2dugciCE0 JoKRSlkL+dwmCsC3+jKxjEk92doAD3Js//+y2awzL4MMB3zYd9YX0a7qd1tsK3keY55s O3r3cvp8ddd7rJa4pDAlWPdQELIroQjDK6XKMdb9/L/2g8RO8kvS2cdkT5g54rSN0E/V kdjQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=AumJku5mcZ/Rq/5BxLKNESx5aO3qoxwojN7ONDDAbDY=; b=J/9PgixbFJp9y+yM/XirQDIJdCDJsRW9ykck5ahWGX+XoG1FCniCfOmQL7UrjpHAlq L4zUoXowHP/yvflNYZNc8nDdraqekLqTIUfZ82m7n8+cukDwIPHSFl3iJVc5oMtXPoKq KqXgLKL7hinyBUhvkX6/pMZqjc/6tiTyoJKIPFqkDeIPM3RfG7GVAbMkDcw7qNOh97dS Ss/ogEI+D7KRPPNtexKIO8c2qUdUkpVWSuzsiAiixEdIAc36VGd+/V/MOLDSCfLQB0C4 CwvRfpSnj3p1cx7cKDmtEW2ng0xRQ/wL/nK1ea/5+HNt96xPqRGFjfl87zgdsNZNc6I9 KUCg== X-Gm-Message-State: AOAM530NQKx6q0Qm0zMmHI1OKooU7PAcTZRYd0rWiaJ+jm2Rp9SobiwY /bwy0sAhKY2BgVO53scv/CqSwQ== X-Google-Smtp-Source: ABdhPJwQpBfn2RcJFoF86XoagpskOIpTEAlcXpQEqf55M8K2znE44A3T73GzI52vu7iptTEN1D004Q== X-Received: by 2002:a17:902:e901:: with SMTP id k1mr8705116pld.130.1595599446089; Fri, 24 Jul 2020 07:04:06 -0700 (PDT) Received: from [10.86.108.142] ([103.136.221.71]) by smtp.gmail.com with ESMTPSA id g18sm6470227pfi.141.2020.07.24.07.04.04 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 24 Jul 2020 07:04:05 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.1\)) Subject: Re: [External] [PATCH] RDMA/rxe: fix retry forever when rnr_retry >= 7 From: =?utf-8?B?5p2o5biG?= In-Reply-To: Date: Fri, 24 Jul 2020 22:04:01 +0800 Cc: Zhu Yanjun , linux-rdma@vger.kernel.org Content-Transfer-Encoding: quoted-printable Message-Id: <827596D2-8EB2-4660-9118-70289FCD09AA@bytedance.com> References: To: Zhu Yanjun X-Mailer: Apple Mail (2.3608.120.23.2.1) Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org >=20 > Please read the following from IB specification >=20 Oh I see, I missed that part. Thanks for your explanation. > An exception to > the following is if the RNR NAK retry counter is set to 7. This value = indicates > infinite retry and the counter is not decremented. I wonder what if the user set RNR retry larger than 7? Say the user set = the RNR retry attribute to 10, is he expecting a 10-time retry or an infinite = retry? In the current implementation, any larger-than-7 retry count causes = infinite retry. Is this an expected behavior? Regards, Fan=