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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 7B04AC432BE for ; Wed, 1 Sep 2021 11:26:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 58EF06101B for ; Wed, 1 Sep 2021 11:26:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241833AbhIAL1c (ORCPT ); Wed, 1 Sep 2021 07:27:32 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:17306 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S238424AbhIAL12 (ORCPT ); Wed, 1 Sep 2021 07:27:28 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 181B9DmU066359; Wed, 1 Sep 2021 07:26:31 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding; s=pp1; bh=I8hQID+vSl4NuGAz5BcL53/xBmYYHTKXcGDR/m62xHs=; b=I3khhDdplqvZ5oVogjAD+VmwTrTwEMnLZy1z925LEZRxc6r7ImDJFg2P9xZxoUL/k7Vw 7Whb5o4NaoQVJfVmbTI22cGlJu90pl4bzl0AxbNWUIzGc4O83aPpgjyebh8fOBduHvb/ gcQ6MOcwLGVW2xBZDNAieebjybMtMYYEr2BJiFUWZCKoWzJOdKORg4qw+ps2sKnxJza6 pKetmxh5N38xd9KALuAes/B7WHhBWEfZQHC01Wp5ZjS5jqJs6Mf6xu4ML81MVB+BCNH3 7RdiQhKZ2XyHp9FnbuuWT0q28nnuSPV26rrGCqXVdlVI+Bn8N377qR4uxT/Rx72Z7mQz AA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 3at6xm2y2e-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 01 Sep 2021 07:26:30 -0400 Received: from m0098419.ppops.net (m0098419.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 181BQUVq141314; Wed, 1 Sep 2021 07:26:30 -0400 Received: from ppma04ams.nl.ibm.com (63.31.33a9.ip4.static.sl-reverse.com [169.51.49.99]) by mx0b-001b2d01.pphosted.com with ESMTP id 3at6xm2y1u-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 01 Sep 2021 07:26:30 -0400 Received: from pps.filterd (ppma04ams.nl.ibm.com [127.0.0.1]) by ppma04ams.nl.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 181BLprA003143; Wed, 1 Sep 2021 11:26:28 GMT Received: from b06avi18626390.portsmouth.uk.ibm.com (b06avi18626390.portsmouth.uk.ibm.com [9.149.26.192]) by ppma04ams.nl.ibm.com with ESMTP id 3aqcs9sxjt-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 01 Sep 2021 11:26:28 +0000 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 181BMRJm61669698 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 1 Sep 2021 11:22:27 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2F9EDA511A; Wed, 1 Sep 2021 11:26:26 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E9216A5118; Wed, 1 Sep 2021 11:26:25 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 1 Sep 2021 11:26:25 +0000 (GMT) From: Niklas Schnelle To: Leon Romanovsky , Jason Gunthorpe , Doug Ledford Cc: linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] RDMA/mlx5: Fix number of allocated XLT entries Date: Wed, 1 Sep 2021 13:26:24 +0200 Message-Id: <20210901112625.1638072-1-schnelle@linux.ibm.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: SY0JeQrIrJgGNoQ5vIayw0bJxorvpMwJ X-Proofpoint-ORIG-GUID: jX-96SmZr7F_k7ZprkhKbuYyKLtwNt5E X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-09-01_03:2021-09-01,2021-09-01 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 priorityscore=1501 mlxscore=0 impostorscore=0 suspectscore=0 spamscore=0 lowpriorityscore=0 adultscore=0 clxscore=1011 mlxlogscore=999 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2107140000 definitions=main-2109010065 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org In commit 8010d74b9965b ("RDMA/mlx5: Split the WR setup out of mlx5_ib_update_xlt()") the allocation logic was split out of mlx5_ib_update_xlt() and the logic was changed to enable better OOM handling. Sadly this change introduced a miscalculation of the number of entries that were actually allocated when under memory pressure where it can actually become 0 which on s390 lets dma_map_single() fail. It can also lead to corruption of the free pages list when the wrong number of entries is used in the calculation of sg->length which is used as argument for free_pages(). Fix this by using the allocation size instead of misusing get_order(size). Cc: stable@vger.kernel.org Fixes: 8010d74b9965b ("RDMA/mlx5: Split the WR setup out of mlx5_ib_update_xlt()") Signed-off-by: Niklas Schnelle --- drivers/infiniband/hw/mlx5/mr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c index 3f1c5a4f158b..19713cdd7b78 100644 --- a/drivers/infiniband/hw/mlx5/mr.c +++ b/drivers/infiniband/hw/mlx5/mr.c @@ -1024,7 +1024,7 @@ static void *mlx5_ib_alloc_xlt(size_t *nents, size_t ent_size, gfp_t gfp_mask) if (size > MLX5_SPARE_UMR_CHUNK) { size = MLX5_SPARE_UMR_CHUNK; - *nents = get_order(size) / ent_size; + *nents = size / ent_size; res = (void *)__get_free_pages(gfp_mask | __GFP_NOWARN, get_order(size)); if (res) -- 2.25.1