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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E7208C43217 for ; Sat, 26 Feb 2022 08:51:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230313AbiBZIvi (ORCPT ); Sat, 26 Feb 2022 03:51:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57320 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230292AbiBZIvg (ORCPT ); Sat, 26 Feb 2022 03:51:36 -0500 Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF3B37C171; Sat, 26 Feb 2022 00:51:01 -0800 (PST) Received: from pps.filterd (m0246631.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 21Q4n0pP008190; Sat, 26 Feb 2022 08:50:00 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : content-type : mime-version; s=corp-2021-07-09; bh=KULiEBIbcn9Eo3Ut40u3HCw508xCB4/Jx/reEsrZzC0=; b=AHILOU2vJkR/7plCSGEA/t8i9NtFie8Z5sZBPFLmbq2f8ieE+4PUl+RWKdbHtY27QWAU rPfJ2vENvQFjixeUwGVKJszytAw7Jw+vv96cioKbHCvJVLVIiJm+IcgFlaLxHJNQVg+6 ymfGMdF4jWxZ0c3SDADSn7l+XVy7Ii018SwA/8qIBxGM3Et3kQDSW1ZvDRkpCLScbjm9 MOkJHCji8P8OqCXS228+MkR85YwJ7ASd6llZdmVSqenr1pk5reEu3KEjZSrGpsdOdybx EDXVnFZpYQBgYsgBNVNaUeBo6fh6XBa2EpDvOGuB6cRrzFfCtF7gvNN7Xe7bz3M3ovg4 6A== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by mx0b-00069f02.pphosted.com with ESMTP id 3efb02gdu0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 26 Feb 2022 08:50:00 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.1.2/8.16.1.2) with SMTP id 21Q8kO7r005020; Sat, 26 Feb 2022 08:49:59 GMT Received: from nam12-bn8-obe.outbound.protection.outlook.com (mail-bn8nam12lp2170.outbound.protection.outlook.com [104.47.55.170]) by userp3030.oracle.com with ESMTP id 3ef9askqdw-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 26 Feb 2022 08:49:59 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=K40YzUD+AXWMUA5NCeSaRxCXmGyhBKO3RRKS+Cf+CrAGfs2QRtIF/OGOytAMLYcspS5qTis97KBFR9Vexe62hZr5XtROlbp7N5Hoyfn7h+FWh4b3DfTBzkQbMRpzW3HiOAkdAYnaHFBW4Uvq3mchZEeq8c+TR+KVCzmVZBRJpmOX5LCgNxguKfXYxRSoORU4WZBD+tH7TmNsUM9LwtDcI3GAU8niLWSIBhzBPs4DyQzE0SM1J2OMF2rWWWfniT3+U9PpJc6uXWcjif9q+Hc/MqHwuNL7BICpf6JKquuDUdAZhCker2sNut1Kdc1tGzdpLMc/sxQmV2ORA1kVJmpGqA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=KULiEBIbcn9Eo3Ut40u3HCw508xCB4/Jx/reEsrZzC0=; b=oElxz/lBUyS9ClWqEJC1KoiSl3osRmcpE/IiSpo6zoLjN8XyKe4N/x7bMgJvAB9W2UpbSO0UBPWjdN9oDHe4sdtrC/mr6fCo/NQHDJ4jeTzLqz5n1YaM10i1reErN20L0l3FfzQJlHbhfn5b9xqxwOV4k0TDAMno/QPIMUlserO9j4Jc3AGQBpsNtIw1MvwpWRAqpOaFUiMRc5BOwEYZptddSmcpDlWVrx/OTPhFYZPlzNLlMdI46A9DrBDW++cynpKEkAGpn++ASRq/X5ZbKAnRc0St1DwAMWhse1AiQpB68/LB7LB9RXa3mprvR8CTob8pkucoDeHZoW3OtfFl4w== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=KULiEBIbcn9Eo3Ut40u3HCw508xCB4/Jx/reEsrZzC0=; b=L0Zizxwykjje2NR/TC4rz2EMQNGo3CwshS4350hS280swduHy29qViYl1ZEndjfYARIcxwb4MSGatNsVhm8CTk8ifM2nKkEWhwagtCqOiE0OzLiFv03U93KVboUg1UWGP8Ocjx5JqwPetv7Zin+Nf7rahB1S6SgJ3QjfWYPBSgg= Received: from BYAPR10MB2663.namprd10.prod.outlook.com (2603:10b6:a02:a9::20) by CY4PR10MB1768.namprd10.prod.outlook.com (2603:10b6:910:c::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5017.26; Sat, 26 Feb 2022 08:49:55 +0000 Received: from BYAPR10MB2663.namprd10.prod.outlook.com ([fe80::a0d5:610d:bcf:9b47]) by BYAPR10MB2663.namprd10.prod.outlook.com ([fe80::a0d5:610d:bcf:9b47%4]) with mapi id 15.20.5017.025; Sat, 26 Feb 2022 08:49:55 +0000 From: Dongli Zhang To: netdev@vger.kernel.org, bpf@vger.kernel.org Cc: linux-kernel@vger.kernel.org, davem@davemloft.net, kuba@kernel.org, rostedt@goodmis.org, mingo@redhat.com, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, imagedong@tencent.com, joao.m.martins@oracle.com, joe.jin@oracle.com, dsahern@gmail.com, edumazet@google.com Subject: [PATCH net-next v4 2/4] net: tap: track dropped skb via kfree_skb_reason() Date: Sat, 26 Feb 2022 00:49:27 -0800 Message-Id: <20220226084929.6417-3-dongli.zhang@oracle.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220226084929.6417-1-dongli.zhang@oracle.com> References: <20220226084929.6417-1-dongli.zhang@oracle.com> Content-Type: text/plain X-ClientProxiedBy: SJ0PR05CA0196.namprd05.prod.outlook.com (2603:10b6:a03:330::21) To BYAPR10MB2663.namprd10.prod.outlook.com (2603:10b6:a02:a9::20) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 2b1c431f-d024-420e-6692-08d9f904f5c3 X-MS-TrafficTypeDiagnostic: CY4PR10MB1768:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BYAPR10MB2663.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230001)(366004)(52116002)(316002)(6512007)(6666004)(6506007)(186003)(5660300002)(86362001)(8936002)(44832011)(26005)(7416002)(1076003)(2616005)(2906002)(8676002)(66476007)(66556008)(83380400001)(66946007)(38350700002)(38100700002)(4326008)(6486002)(508600001)(36756003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?X73KnMAgIoNWHepzmwnCxFSmDRoQNK780Tm/qKnI4K1MxXWfWgidtK8yPiqB?= =?us-ascii?Q?96aPwh8ejGwswRrggkUq8OGtc3OxK9jMLUpj6S4y19pjDiJyL11bFsVROxES?= =?us-ascii?Q?Pa7X/j8NLgpR2A2GG64+DYT7+G5TB4TApot/zpgKFT2rJm1zCcRI/zdRwC9B?= =?us-ascii?Q?6MYMLX5Y8rHsb9WfKxwO8SpzT8ZE99XIjQ9ZLZqyyfSb8+IFb5qIqpkETq9B?= =?us-ascii?Q?b73G5u6773dooUnLfmstuTqWNffhbkhRnOMlu/veL7dRBXJNHNM3vtXA+E0X?= =?us-ascii?Q?q9d8iCTPaCop6w7bfatTxO3cnCBf8sh9W0hMLjoiFWpa6EXTxLxq2cpJYdys?= =?us-ascii?Q?ubqkJnRHQ0u9pe9UAiLVsYhPnCyxKYzXZ9C70fRpKNCJCFFpf2Gq4tRssrYm?= =?us-ascii?Q?myzlRdHeZjWe1V0Y+JLapx90mivgiHmbr2nwb9GcKu4mWmL2fU/KadTaRCbL?= =?us-ascii?Q?/DcEHa2vazsIfKU+uUlOevVH2NGerfHMkOwZDId6wZIy5pL/RgMyFWjqB0Ol?= =?us-ascii?Q?6paMB+B9/DCG20mn2qfHAUyXLTPxXl4/lQRZT1KRD5cIXupKJX3jeH7FWBs/?= =?us-ascii?Q?VxLovyNndUOH5txDxKRJWExIb0uee78hnJVu3bavlxSWwGQR/QysAyaq3BvG?= =?us-ascii?Q?AU4+4WA0fgz49ZBINkszQ4TZQUJ0x+xe9GxGT9tNLXKdxWopN5jgUiNClQBr?= =?us-ascii?Q?9SrNz+zanEN4VaXUxNaeID14YqqFqLdD8hfvrdfOWYOQqVRUXp4vH+dLRNEf?= =?us-ascii?Q?MtAtdH5Cw0HUQae5DN4ceRIPC0p4mzm3zl9tqRyPAVf4Rthm/zRoh2PJnu4l?= =?us-ascii?Q?FjBXU9bjbCxBk7SBJ9B+px8SP8OFFnruTIEIxvLjQByvOf3T6dgW2Ts19fHh?= =?us-ascii?Q?QtX3OxIRT2nvDwm8KQPJ617yzWq57aJD6xTM+KKzZNg+I6vl22bSNSwl/0rs?= =?us-ascii?Q?kZJTPa2aOtbRLKYLO/x7xHDEeNohWXu6PiFCsrkVM3v8Gcsd/d0R0PYa4DKK?= =?us-ascii?Q?HUcotRE4a6IiPQNd1nePeSh8DRmZZqgHMQJZMInkrxzMm3Kzs+4lpD928G/6?= =?us-ascii?Q?Uo5NuCOw4HD3K7k+or9UHErd3N/vnp30F2TGKOwehI5+ycC3JpgG+PTDyIVC?= =?us-ascii?Q?ZsLPElMB/KdsnSztkn8HeiWlvqVPkHqvHnG6U/3BfnpwEw9trMg48QXcoCXp?= =?us-ascii?Q?SgfPW75vQ3cvh3ra54td38mZBSkvi3aUValWn9hiEfoPdoQ7QYxTmgmwjpEp?= =?us-ascii?Q?8NELj0kMNvCGcn01l6e7uDV5SFbHOKnW3TgEf4ci5Jmjl6G5rOHDhfwN+7WE?= =?us-ascii?Q?Ll/dPq6r5nrH64MYsj+Bels8dvuTMthQbsY2aVJMJDWhNN5s5dMvePwdlV5V?= =?us-ascii?Q?uETFbZrrYfN/x4bZ7ledg5egJV0cbbB6tT0coS2Ej0LoNu7XxRFkx/sbhk5S?= =?us-ascii?Q?FF3moWCLxIeDjaHnQIOu6sRvKC7HwO8PFCQNmnwjcUdNbRcIAM48uMBAu1a5?= =?us-ascii?Q?7LT6mexsyAHhOXgg3Q+JkPh47PAlMBbpClYes2VEzvD5nXBmCsXK8E1rIZs9?= =?us-ascii?Q?+YN+kzsYxfEaoPzFm1V0LowMYfEwpC2w+qIJJkdxSsdEmyBdRU/xyKDbF6w6?= =?us-ascii?Q?GkkHvjAOK3PS7I7FHI2dwj4=3D?= X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2b1c431f-d024-420e-6692-08d9f904f5c3 X-MS-Exchange-CrossTenant-AuthSource: BYAPR10MB2663.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Feb 2022 08:49:54.9919 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: X4xOEFrqyr5KhAbucr9NDiG0VjSKdOI2OX9JZBhfnL8OTyJnTh1Xoo83tW6mm1wGtyXuLECpV+gMZb4+zL/QWg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR10MB1768 X-Proofpoint-Virus-Version: vendor=nai engine=6300 definitions=10269 signatures=684655 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 bulkscore=0 malwarescore=0 mlxscore=0 phishscore=0 suspectscore=0 adultscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2202260060 X-Proofpoint-GUID: dLfnqIzUtmsjzVCU4ACEHqQwQC18JO8J X-Proofpoint-ORIG-GUID: dLfnqIzUtmsjzVCU4ACEHqQwQC18JO8J Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The TAP can be used as vhost-net backend. E.g., the tap_handle_frame() is the interface to forward the skb from TAP to vhost-net/virtio-net. However, there are many "goto drop" in the TAP driver. Therefore, the kfree_skb_reason() is involved at each "goto drop" to help userspace ftrace/ebpf to track the reason for the loss of packets. The below reasons are introduced: - SKB_DROP_REASON_SKB_CSUM - SKB_DROP_REASON_SKB_COPY_DATA - SKB_DROP_REASON_SKB_GSO_SEG - SKB_DROP_REASON_DEV_HDR - SKB_DROP_REASON_FULL_RING Cc: Joao Martins Cc: Joe Jin Signed-off-by: Dongli Zhang Reviewed-by: David Ahern --- Changed since v1: - revise the reason name Changed since v2: - declare drop_reason as type "enum skb_drop_reason" - handle the drop in skb_list_walk_safe() case drivers/net/tap.c | 35 +++++++++++++++++++++++++---------- include/linux/skbuff.h | 9 +++++++++ include/trace/events/skb.h | 5 +++++ 3 files changed, 39 insertions(+), 10 deletions(-) diff --git a/drivers/net/tap.c b/drivers/net/tap.c index 8e3a28ba6b28..b48f519fe63f 100644 --- a/drivers/net/tap.c +++ b/drivers/net/tap.c @@ -322,6 +322,7 @@ rx_handler_result_t tap_handle_frame(struct sk_buff **pskb) struct tap_dev *tap; struct tap_queue *q; netdev_features_t features = TAP_FEATURES; + enum skb_drop_reason drop_reason; tap = tap_dev_get_rcu(dev); if (!tap) @@ -343,12 +344,16 @@ rx_handler_result_t tap_handle_frame(struct sk_buff **pskb) struct sk_buff *segs = __skb_gso_segment(skb, features, false); struct sk_buff *next; - if (IS_ERR(segs)) + if (IS_ERR(segs)) { + drop_reason = SKB_DROP_REASON_SKB_GSO_SEG; goto drop; + } if (!segs) { - if (ptr_ring_produce(&q->ring, skb)) + if (ptr_ring_produce(&q->ring, skb)) { + drop_reason = SKB_DROP_REASON_FULL_RING; goto drop; + } goto wake_up; } @@ -356,8 +361,9 @@ rx_handler_result_t tap_handle_frame(struct sk_buff **pskb) skb_list_walk_safe(segs, skb, next) { skb_mark_not_on_list(skb); if (ptr_ring_produce(&q->ring, skb)) { - kfree_skb(skb); - kfree_skb_list(next); + drop_reason = SKB_DROP_REASON_FULL_RING; + kfree_skb_reason(skb, drop_reason); + kfree_skb_list_reason(next, drop_reason); break; } } @@ -369,10 +375,14 @@ rx_handler_result_t tap_handle_frame(struct sk_buff **pskb) */ if (skb->ip_summed == CHECKSUM_PARTIAL && !(features & NETIF_F_CSUM_MASK) && - skb_checksum_help(skb)) + skb_checksum_help(skb)) { + drop_reason = SKB_DROP_REASON_SKB_CSUM; goto drop; - if (ptr_ring_produce(&q->ring, skb)) + } + if (ptr_ring_produce(&q->ring, skb)) { + drop_reason = SKB_DROP_REASON_FULL_RING; goto drop; + } } wake_up: @@ -383,7 +393,7 @@ rx_handler_result_t tap_handle_frame(struct sk_buff **pskb) /* Count errors/drops only here, thus don't care about args. */ if (tap->count_rx_dropped) tap->count_rx_dropped(tap); - kfree_skb(skb); + kfree_skb_reason(skb, drop_reason); return RX_HANDLER_CONSUMED; } EXPORT_SYMBOL_GPL(tap_handle_frame); @@ -632,6 +642,7 @@ static ssize_t tap_get_user(struct tap_queue *q, void *msg_control, int depth; bool zerocopy = false; size_t linear; + enum skb_drop_reason drop_reason; if (q->flags & IFF_VNET_HDR) { vnet_hdr_len = READ_ONCE(q->vnet_hdr_sz); @@ -696,8 +707,10 @@ static ssize_t tap_get_user(struct tap_queue *q, void *msg_control, else err = skb_copy_datagram_from_iter(skb, 0, from, len); - if (err) + if (err) { + drop_reason = SKB_DROP_REASON_SKB_COPY_DATA; goto err_kfree; + } skb_set_network_header(skb, ETH_HLEN); skb_reset_mac_header(skb); @@ -706,8 +719,10 @@ static ssize_t tap_get_user(struct tap_queue *q, void *msg_control, if (vnet_hdr_len) { err = virtio_net_hdr_to_skb(skb, &vnet_hdr, tap_is_little_endian(q)); - if (err) + if (err) { + drop_reason = SKB_DROP_REASON_DEV_HDR; goto err_kfree; + } } skb_probe_transport_header(skb); @@ -738,7 +753,7 @@ static ssize_t tap_get_user(struct tap_queue *q, void *msg_control, return total_len; err_kfree: - kfree_skb(skb); + kfree_skb_reason(skb, drop_reason); err: rcu_read_lock(); diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index bc3f7822110c..9f523da4d3f2 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -380,6 +380,15 @@ enum skb_drop_reason { * the ofo queue, corresponding to * LINUX_MIB_TCPOFOMERGE */ + SKB_DROP_REASON_SKB_CSUM, /* sk_buff checksum error */ + SKB_DROP_REASON_SKB_COPY_DATA, /* failed to copy data from or to + * sk_buff + */ + SKB_DROP_REASON_SKB_GSO_SEG, /* gso segmentation error */ + SKB_DROP_REASON_DEV_HDR, /* there is something wrong with + * device driver specific header + */ + SKB_DROP_REASON_FULL_RING, /* ring buffer is full */ SKB_DROP_REASON_MAX, }; diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h index 2ab7193313aa..5b5f1351dcde 100644 --- a/include/trace/events/skb.h +++ b/include/trace/events/skb.h @@ -37,6 +37,11 @@ EM(SKB_DROP_REASON_TCP_OLD_DATA, TCP_OLD_DATA) \ EM(SKB_DROP_REASON_TCP_OVERWINDOW, TCP_OVERWINDOW) \ EM(SKB_DROP_REASON_TCP_OFOMERGE, TCP_OFOMERGE) \ + EM(SKB_DROP_REASON_SKB_CSUM, SKB_CSUM) \ + EM(SKB_DROP_REASON_SKB_COPY_DATA, SKB_COPY_DATA) \ + EM(SKB_DROP_REASON_SKB_GSO_SEG, SKB_GSO_SEG) \ + EM(SKB_DROP_REASON_DEV_HDR, DEV_HDR) \ + EM(SKB_DROP_REASON_FULL_RING, FULL_RING) \ EMe(SKB_DROP_REASON_MAX, MAX) #undef EM -- 2.17.1