From patchwork Tue Feb 2 13:36:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Loftus, Ciara" X-Patchwork-Id: 375000 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, 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 B1D0CC433E0 for ; Tue, 2 Feb 2021 17:58:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5552564ECE for ; Tue, 2 Feb 2021 17:58:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238065AbhBBR5f (ORCPT ); Tue, 2 Feb 2021 12:57:35 -0500 Received: from mga06.intel.com ([134.134.136.31]:52445 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233675AbhBBOIv (ORCPT ); Tue, 2 Feb 2021 09:08:51 -0500 IronPort-SDR: /JGeFuokv4KwsUWxe2yKIsmm3y5P9yVD6h9r+NZqZInAMXGBECW2KuM4T1h9lUobJEowqO3HJq i+Vd+D+eVcNw== X-IronPort-AV: E=McAfee;i="6000,8403,9882"; a="242371363" X-IronPort-AV: E=Sophos;i="5.79,395,1602572400"; d="scan'208";a="242371363" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Feb 2021 06:06:43 -0800 IronPort-SDR: RpYyiJkRarA/yatYhjV/cPc857C1uLV3ReHe9wDbMVXzzzDFiFWAk1KvkRtkxR5knkEt8FYXxE LTVsIuedXHXg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.79,395,1602572400"; d="scan'208";a="479774668" Received: from silpixa00399839.ir.intel.com (HELO localhost.localdomain) ([10.237.222.142]) by fmsmga001.fm.intel.com with ESMTP; 02 Feb 2021 06:06:41 -0800 From: Ciara Loftus To: netdev@vger.kernel.org, bpf@vger.kernel.org, magnus.karlsson@intel.com, bjorn@kernel.org, weqaar.a.janjua@intel.com Cc: daniel@iogearbox.net, Ciara Loftus Subject: [PATCH bpf-next v3 1/6] xsk: add tracepoints for packet drops Date: Tue, 2 Feb 2021 13:36:37 +0000 Message-Id: <20210202133642.8562-2-ciara.loftus@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210202133642.8562-1-ciara.loftus@intel.com> References: <20210202133642.8562-1-ciara.loftus@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This commit introduces tracing infrastructure for AF_XDP sockets (xsks) and a new trace event called 'xsk_packet_drop'. This trace event is triggered when a packet cannot be processed by the socket due to one of the following issues: (1) packet exceeds the maximum permitted size. (2) invalid fill descriptor address. (3) invalid tx descriptor field. The trace provides information about the error to the user. For example the size vs permitted size is provided for (1). For (2) and (3) the relevant descriptor fields are printed. This information should help a user troubleshoot packet drops by providing this extra level of detail which is not available through use of simple counters. The tracepoint can be enabled/disabled by toggling /sys/kernel/debug/tracing/events/xsk/xsk_packet_drop/enable Signed-off-by: Ciara Loftus Reported-by: kernel test robot --- MAINTAINERS | 1 + include/linux/bpf_trace.h | 1 + include/trace/events/xsk.h | 73 +++++++++++++++++++++++++++++++ include/uapi/linux/if_xdp.h | 6 +++ kernel/bpf/core.c | 1 + net/xdp/xsk.c | 7 ++- net/xdp/xsk_buff_pool.c | 3 ++ net/xdp/xsk_queue.h | 4 ++ tools/include/uapi/linux/if_xdp.h | 6 +++ 9 files changed, 101 insertions(+), 1 deletion(-) create mode 100644 include/trace/events/xsk.h diff --git a/MAINTAINERS b/MAINTAINERS index 1df56a32d2df..efe6662d4198 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -19440,6 +19440,7 @@ S: Maintained F: Documentation/networking/af_xdp.rst F: include/net/xdp_sock* F: include/net/xsk_buff_pool.h +F: include/trace/events/xsk.h F: include/uapi/linux/if_xdp.h F: include/uapi/linux/xdp_diag.h F: include/net/netns/xdp.h diff --git a/include/linux/bpf_trace.h b/include/linux/bpf_trace.h index ddf896abcfb6..477d29b6c2c1 100644 --- a/include/linux/bpf_trace.h +++ b/include/linux/bpf_trace.h @@ -3,5 +3,6 @@ #define __LINUX_BPF_TRACE_H__ #include +#include #endif /* __LINUX_BPF_TRACE_H__ */ diff --git a/include/trace/events/xsk.h b/include/trace/events/xsk.h new file mode 100644 index 000000000000..74b53b10c40b --- /dev/null +++ b/include/trace/events/xsk.h @@ -0,0 +1,73 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright(c) 2021 Intel Corporation. */ + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM xsk + +#if !defined(_TRACE_XSK_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_XSK_H + +#include +#include + +#define print_reason(reason) \ + __print_symbolic(reason, \ + { XSK_TRACE_DROP_PKT_TOO_BIG, "packet too big" }, \ + { XSK_TRACE_DROP_INVALID_FILLADDR, "invalid fill addr" }, \ + { XSK_TRACE_DROP_INVALID_TXD, "invalid tx desc" }) + +#define print_val1(reason) \ + __print_symbolic(reason, \ + { XSK_TRACE_DROP_PKT_TOO_BIG, "len" }, \ + { XSK_TRACE_DROP_INVALID_FILLADDR, "addr" }, \ + { XSK_TRACE_DROP_INVALID_TXD, "addr" }) + +#define print_val2(reason) \ + __print_symbolic(reason, \ + { XSK_TRACE_DROP_PKT_TOO_BIG, "max" }, \ + { XSK_TRACE_DROP_INVALID_FILLADDR, "not_used" }, \ + { XSK_TRACE_DROP_INVALID_TXD, "len" }) + +#define print_val3(reason) \ + __print_symbolic(reason, \ + { XSK_TRACE_DROP_PKT_TOO_BIG, "not_used" }, \ + { XSK_TRACE_DROP_INVALID_FILLADDR, "not_used" }, \ + { XSK_TRACE_DROP_INVALID_TXD, "options" }) + + + +TRACE_EVENT(xsk_packet_drop, + + TP_PROTO(char *name, u16 queue_id, u32 reason, u64 val1, u64 val2, u64 val3), + + TP_ARGS(name, queue_id, reason, val1, val2, val3), + + TP_STRUCT__entry( + __field(char *, name) + __field(u16, queue_id) + __field(u32, reason) + __field(u64, val1) + __field(u64, val2) + __field(u64, val3) + ), + + TP_fast_assign( + __entry->name = name; + __entry->queue_id = queue_id; + __entry->reason = reason; + __entry->val1 = val1; + __entry->val2 = val2; + __entry->val3 = val3; + ), + + TP_printk("netdev: %s qid %u reason: %s: %s %lu %s %lu %s %lu", + __entry->name, __entry->queue_id, print_reason(__entry->reason), + print_val1(__entry->reason), __entry->val1, + print_val2(__entry->reason), __entry->val2, + print_val3(__entry->reason), __entry->val3 + ) +); + +#endif /* _TRACE_XSK_H */ + +#include diff --git a/include/uapi/linux/if_xdp.h b/include/uapi/linux/if_xdp.h index a78a8096f4ce..d7eb031d2465 100644 --- a/include/uapi/linux/if_xdp.h +++ b/include/uapi/linux/if_xdp.h @@ -108,4 +108,10 @@ struct xdp_desc { /* UMEM descriptor is __u64 */ +enum xdp_trace_reasons { + XSK_TRACE_DROP_PKT_TOO_BIG, + XSK_TRACE_DROP_INVALID_FILLADDR, + XSK_TRACE_DROP_INVALID_TXD, +}; + #endif /* _LINUX_IF_XDP_H */ diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index 5bbd4884ff7a..442b0d7f9bf8 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -2362,3 +2362,4 @@ EXPORT_SYMBOL(bpf_stats_enabled_key); EXPORT_TRACEPOINT_SYMBOL_GPL(xdp_exception); EXPORT_TRACEPOINT_SYMBOL_GPL(xdp_bulk_tx); +EXPORT_TRACEPOINT_SYMBOL_GPL(xsk_packet_drop); diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c index 4faabd1ecfd1..689da22c8e4f 100644 --- a/net/xdp/xsk.c +++ b/net/xdp/xsk.c @@ -11,6 +11,7 @@ #define pr_fmt(fmt) "AF_XDP: %s: " fmt, __func__ +#include #include #include #include @@ -189,9 +190,13 @@ static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) struct xdp_buff *xsk_xdp; int err; u32 len; + u32 max = xsk_pool_get_rx_frame_size(xs->pool); len = xdp->data_end - xdp->data; - if (len > xsk_pool_get_rx_frame_size(xs->pool)) { + if (len > max) { + trace_xsk_packet_drop(xs->dev->name, xs->queue_id, + XSK_TRACE_DROP_PKT_TOO_BIG, + len, max, 0); xs->rx_dropped++; return -ENOSPC; } diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c index 8de01aaac4a0..e0bd1bfd4324 100644 --- a/net/xdp/xsk_buff_pool.c +++ b/net/xdp/xsk_buff_pool.c @@ -1,5 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 +#include #include #include #include @@ -460,6 +461,8 @@ static struct xdp_buff_xsk *__xp_alloc(struct xsk_buff_pool *pool) ok = pool->unaligned ? xp_check_unaligned(pool, &addr) : xp_check_aligned(pool, &addr); if (!ok) { + trace_xsk_packet_drop(pool->netdev->name, pool->queue_id, + XSK_TRACE_DROP_INVALID_FILLADDR, addr, 0, 0); pool->fq->invalid_descs++; xskq_cons_release(pool->fq); continue; diff --git a/net/xdp/xsk_queue.h b/net/xdp/xsk_queue.h index 2823b7c3302d..8e9ba3cfe286 100644 --- a/net/xdp/xsk_queue.h +++ b/net/xdp/xsk_queue.h @@ -6,6 +6,7 @@ #ifndef _LINUX_XSK_QUEUE_H #define _LINUX_XSK_QUEUE_H +#include #include #include #include @@ -175,6 +176,9 @@ static inline bool xskq_cons_is_valid_desc(struct xsk_queue *q, struct xsk_buff_pool *pool) { if (!xp_validate_desc(pool, d)) { + trace_xsk_packet_drop(pool->netdev->name, pool->queue_id, + XSK_TRACE_DROP_INVALID_TXD, d->addr, + d->len, d->options); q->invalid_descs++; return false; } diff --git a/tools/include/uapi/linux/if_xdp.h b/tools/include/uapi/linux/if_xdp.h index a78a8096f4ce..d7eb031d2465 100644 --- a/tools/include/uapi/linux/if_xdp.h +++ b/tools/include/uapi/linux/if_xdp.h @@ -108,4 +108,10 @@ struct xdp_desc { /* UMEM descriptor is __u64 */ +enum xdp_trace_reasons { + XSK_TRACE_DROP_PKT_TOO_BIG, + XSK_TRACE_DROP_INVALID_FILLADDR, + XSK_TRACE_DROP_INVALID_TXD, +}; + #endif /* _LINUX_IF_XDP_H */