From patchwork Mon Jul 12 06:09:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 475694 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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 74296C11F67 for ; Mon, 12 Jul 2021 07:19:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 586F9611F1 for ; Mon, 12 Jul 2021 07:19:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242177AbhGLHWf (ORCPT ); Mon, 12 Jul 2021 03:22:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:56246 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244940AbhGLHTP (ORCPT ); Mon, 12 Jul 2021 03:19:15 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 452AD610A6; Mon, 12 Jul 2021 07:16:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626074187; bh=JAP3cuzghKjeXSy/byvWtbu3KZU0skWbKJ6bO9HiEEM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=w8iVbJRzJYHnEF9yaz9MkDtmaXovfeOCWqvZlveqvnkqCeZrUWVPIoUgghOxGdLTF 2f/HWvaNPw2CK2ANMiTf2GmvSm1+eh8JdCHJstGw4PxUzsEhE0Qic1Z+7vOyaeznHz O/HAhSXtEUgUWmcUs+r/tQXB80QPH6XDdcycA9f4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?utf-8?q?H=C3=A5kon_Bugge?= , Leon Romanovsky , Jason Gunthorpe , Sasha Levin Subject: [PATCH 5.12 495/700] RDMA/cma: Fix incorrect Packet Lifetime calculation Date: Mon, 12 Jul 2021 08:09:38 +0200 Message-Id: <20210712061029.175960474@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210712060924.797321836@linuxfoundation.org> References: <20210712060924.797321836@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Håkon Bugge [ Upstream commit e84045eab69c625bc0b0bf24d8e05bc65da1eed1 ] An approximation for the PacketLifeTime is half the local ACK timeout. The encoding for both timers are logarithmic. If the local ACK timeout is set, but zero, it means the timer is disabled. In this case, we choose the CMA_IBOE_PACKET_LIFETIME value, since 50% of infinite makes no sense. Before this commit, the PacketLifeTime became 255 if local ACK timeout was zero (not running). Fixed by explicitly testing for timeout being zero. Fixes: e1ee1e62bec4 ("RDMA/cma: Use ACK timeout for RoCE packetLifeTime") Link: https://lore.kernel.org/r/1624371207-26710-1-git-send-email-haakon.bugge@oracle.com Signed-off-by: Håkon Bugge Reviewed-by: Leon Romanovsky Signed-off-by: Jason Gunthorpe Signed-off-by: Sasha Levin --- drivers/infiniband/core/cma.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c index 2f5f384987a2..68bbcecb0a6a 100644 --- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -3060,8 +3060,10 @@ static int cma_resolve_iboe_route(struct rdma_id_private *id_priv) * as a reasonable approximation for RoCE networks. */ mutex_lock(&id_priv->qp_mutex); - route->path_rec->packet_life_time = id_priv->timeout_set ? - id_priv->timeout - 1 : CMA_IBOE_PACKET_LIFETIME; + if (id_priv->timeout_set && id_priv->timeout) + route->path_rec->packet_life_time = id_priv->timeout - 1; + else + route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME; mutex_unlock(&id_priv->qp_mutex); if (!route->path_rec->mtu) {