From patchwork Tue Apr 18 13:30:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jesper Dangaard Brouer X-Patchwork-Id: 13215728 X-Patchwork-Delegate: bpf@iogearbox.net 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 6D73FC77B75 for ; Tue, 18 Apr 2023 13:32:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231305AbjDRNcL (ORCPT ); Tue, 18 Apr 2023 09:32:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50478 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230311AbjDRNcJ (ORCPT ); Tue, 18 Apr 2023 09:32:09 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EA9F315A22 for ; Tue, 18 Apr 2023 06:31:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1681824677; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=AK4HrA02Q1v0w9WsJgOrguYhNpSNgBPs/ggkgsLYvjA=; b=d0Z1H4r94J15iC6NqATWFEBInF4nqTvLZD29gIP5QwhQMgutPVLYRK1WHIAVMZx1izTYoM uIIGcBym4GvhBy7ADy2jdLYfv2MY3ddRuoJ9SZpHlse77/j5+fvxVrYathBakOW79ET7/b oYa6eie6Jy1C+aKOmCTvT71t0EA2v4U= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-664-PMQLmTNYOwewXYm-BgBc4g-1; Tue, 18 Apr 2023 09:31:06 -0400 X-MC-Unique: PMQLmTNYOwewXYm-BgBc4g-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E28DC3850542; Tue, 18 Apr 2023 13:31:03 +0000 (UTC) Received: from firesoul.localdomain (unknown [10.45.242.22]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8B2B51410F21; Tue, 18 Apr 2023 13:30:58 +0000 (UTC) Received: from [10.1.1.1] (localhost [IPv6:::1]) by firesoul.localdomain (Postfix) with ESMTP id EC4FC307372E8; Tue, 18 Apr 2023 15:30:57 +0200 (CEST) Subject: [PATCH bpf-next V2 4/5] igc: add XDP hints kfuncs for RX timestamp From: Jesper Dangaard Brouer To: bpf@vger.kernel.org, Stanislav Fomichev , =?utf-8?q?Toke?= =?utf-8?q?_H=C3=B8iland-J=C3=B8rgensen?= Cc: Jesper Dangaard Brouer , netdev@vger.kernel.org, martin.lau@kernel.org, ast@kernel.org, daniel@iogearbox.net, alexandr.lobakin@intel.com, larysa.zaremba@intel.com, xdp-hints@xdp-project.net, yoong.siang.song@intel.com, intel-wired-lan@lists.osuosl.org, pabeni@redhat.com, jesse.brandeburg@intel.com, kuba@kernel.org, edumazet@google.com, john.fastabend@gmail.com, hawk@kernel.org, davem@davemloft.net Date: Tue, 18 Apr 2023 15:30:57 +0200 Message-ID: <168182465791.616355.2583922957423587914.stgit@firesoul> In-Reply-To: <168182460362.616355.14591423386485175723.stgit@firesoul> References: <168182460362.616355.14591423386485175723.stgit@firesoul> User-Agent: StGit/1.4 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net The NIC hardware RX timestamping mechanism adds an optional tailored header before the MAC header containing packet reception time. Optional depending on RX descriptor TSIP status bit (IGC_RXDADV_STAT_TSIP). In case this bit is set driver does offset adjustments to packet data start and extracts the timestamp. The timestamp need to be extracted before invoking the XDP bpf_prog, because this area just before the packet is also accessible by XDP via data_meta context pointer (and helper bpf_xdp_adjust_meta). Thus, an XDP bpf_prog can potentially overwrite this and corrupt data that we want to extract with the new kfunc for reading the timestamp. Signed-off-by: Jesper Dangaard Brouer --- drivers/net/ethernet/intel/igc/igc.h | 1 + drivers/net/ethernet/intel/igc/igc_main.c | 16 ++++++++++++++++ 2 files changed, 17 insertions(+) diff --git a/drivers/net/ethernet/intel/igc/igc.h b/drivers/net/ethernet/intel/igc/igc.h index c609a2e648f8..18d4af934d8c 100644 --- a/drivers/net/ethernet/intel/igc/igc.h +++ b/drivers/net/ethernet/intel/igc/igc.h @@ -503,6 +503,7 @@ struct igc_rx_buffer { struct igc_xdp_buff { struct xdp_buff xdp; union igc_adv_rx_desc *rx_desc; + ktime_t rx_ts; /* data indication bit IGC_RXDADV_STAT_TSIP */ }; struct igc_q_vector { diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c index 9cb43c0eab73..38d113b48111 100644 --- a/drivers/net/ethernet/intel/igc/igc_main.c +++ b/drivers/net/ethernet/intel/igc/igc_main.c @@ -2552,6 +2552,7 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget) if (igc_test_staterr(rx_desc, IGC_RXDADV_STAT_TSIP)) { timestamp = igc_ptp_rx_pktstamp(q_vector->adapter, pktbuf); + ctx.rx_ts = timestamp; pkt_offset = IGC_TS_HDR_LEN; size -= IGC_TS_HDR_LEN; } @@ -2740,6 +2741,7 @@ static int igc_clean_rx_irq_zc(struct igc_q_vector *q_vector, const int budget) if (igc_test_staterr(desc, IGC_RXDADV_STAT_TSIP)) { timestamp = igc_ptp_rx_pktstamp(q_vector->adapter, bi->xdp->data); + ctx->rx_ts = timestamp; bi->xdp->data += IGC_TS_HDR_LEN; @@ -6526,8 +6528,22 @@ static int igc_xdp_rx_hash(const struct xdp_md *_ctx, u32 *hash, return 0; } +static int igc_xdp_rx_timestamp(const struct xdp_md *_ctx, u64 *timestamp) +{ + const struct igc_xdp_buff *ctx = (void *)_ctx; + + if (igc_test_staterr(ctx->rx_desc, IGC_RXDADV_STAT_TSIP)) { + *timestamp = ctx->rx_ts; + + return 0; + } + + return -ENODATA; +} + static const struct xdp_metadata_ops igc_xdp_metadata_ops = { .xmo_rx_hash = igc_xdp_rx_hash, + .xmo_rx_timestamp = igc_xdp_rx_timestamp, }; /**