From patchwork Fri Mar 12 17:47:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Nguyen X-Patchwork-Id: 399400 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, 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 91516C433DB for ; Fri, 12 Mar 2021 17:47:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5A15464F0E for ; Fri, 12 Mar 2021 17:47:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232468AbhCLRrJ (ORCPT ); Fri, 12 Mar 2021 12:47:09 -0500 Received: from mga06.intel.com ([134.134.136.31]:9116 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232233AbhCLRqi (ORCPT ); Fri, 12 Mar 2021 12:46:38 -0500 IronPort-SDR: FQxB7mO4UcvBTA4oYkvJASVDVgwCS9QVWWHGAd9owJCqY/mZ/pilHH2mFXRmL5Exh8QovZWNoa /Yd4olSnSJsA== X-IronPort-AV: E=McAfee;i="6000,8403,9921"; a="250232655" X-IronPort-AV: E=Sophos;i="5.81,244,1610438400"; d="scan'208";a="250232655" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Mar 2021 09:46:38 -0800 IronPort-SDR: /HBHtw9GWVepyl3BgYEwkiehjB998RG+8KWFVFAqwYTIRkEUTmvHFwjdcnqdSejC4RCexw8iKi BSquv+qYmG7Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.81,244,1610438400"; d="scan'208";a="589615848" Received: from anguy11-desk2.jf.intel.com ([10.166.244.147]) by orsmga005.jf.intel.com with ESMTP; 12 Mar 2021 09:46:38 -0800 From: Tony Nguyen To: davem@davemloft.net, kuba@kernel.org Cc: Maciej Fijalkowski , netdev@vger.kernel.org, sassmann@redhat.com, anthony.l.nguyen@intel.com, bjorn.topel@intel.com, magnus.karlsson@intel.com, Jesper Dangaard Brouer , Kiran Bhandare Subject: [PATCH net 2/5] i40e: move headroom initialization to i40e_configure_rx_ring Date: Fri, 12 Mar 2021 09:47:52 -0800 Message-Id: <20210312174755.2103336-3-anthony.l.nguyen@intel.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210312174755.2103336-1-anthony.l.nguyen@intel.com> References: <20210312174755.2103336-1-anthony.l.nguyen@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Maciej Fijalkowski i40e_rx_offset(), that is supposed to initialize the Rx buffer headroom, relies on I40E_RXR_FLAGS_BUILD_SKB_ENABLED flag. Currently, the callsite of mentioned function is placed incorrectly within i40e_setup_rx_descriptors() where Rx ring's build skb flag is not set yet. This causes the XDP_REDIRECT to be partially broken due to inability to create xdp_frame in the headroom space, as the headroom is 0. For the record, below is the call graph: i40e_vsi_open i40e_vsi_setup_rx_resources i40e_setup_rx_descriptors i40e_rx_offset() <-- sets offset to 0 as build_skb flag is set below i40e_vsi_configure_rx i40e_configure_rx_ring set_ring_build_skb_enabled(ring) <-- set build_skb flag Fix this by moving i40e_rx_offset() to i40e_configure_rx_ring() after the flag setting. Fixes: f7bb0d71d658 ("i40e: store the result of i40e_rx_offset() onto i40e_ring") Reported-by: Jesper Dangaard Brouer Co-developed-by: Jesper Dangaard Brouer Signed-off-by: Jesper Dangaard Brouer Signed-off-by: Maciej Fijalkowski Acked-by: Jesper Dangaard Brouer Tested-by: Jesper Dangaard Brouer Tested-by: Kiran Bhandare Signed-off-by: Tony Nguyen --- drivers/net/ethernet/intel/i40e/i40e_main.c | 13 +++++++++++++ drivers/net/ethernet/intel/i40e/i40e_txrx.c | 12 ------------ 2 files changed, 13 insertions(+), 12 deletions(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index 353deae139f9..17f3b800640e 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -3258,6 +3258,17 @@ static int i40e_configure_tx_ring(struct i40e_ring *ring) return 0; } +/** + * i40e_rx_offset - Return expected offset into page to access data + * @rx_ring: Ring we are requesting offset of + * + * Returns the offset value for ring into the data buffer. + */ +static unsigned int i40e_rx_offset(struct i40e_ring *rx_ring) +{ + return ring_uses_build_skb(rx_ring) ? I40E_SKB_PAD : 0; +} + /** * i40e_configure_rx_ring - Configure a receive ring context * @ring: The Rx ring to configure @@ -3369,6 +3380,8 @@ static int i40e_configure_rx_ring(struct i40e_ring *ring) else set_ring_build_skb_enabled(ring); + ring->rx_offset = i40e_rx_offset(ring); + /* cache tail for quicker writes, and clear the reg before use */ ring->tail = hw->hw_addr + I40E_QRX_TAIL(pf_q); writel(0, ring->tail); diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c index 627794b31e33..5747a99122fb 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c @@ -1569,17 +1569,6 @@ void i40e_free_rx_resources(struct i40e_ring *rx_ring) } } -/** - * i40e_rx_offset - Return expected offset into page to access data - * @rx_ring: Ring we are requesting offset of - * - * Returns the offset value for ring into the data buffer. - */ -static unsigned int i40e_rx_offset(struct i40e_ring *rx_ring) -{ - return ring_uses_build_skb(rx_ring) ? I40E_SKB_PAD : 0; -} - /** * i40e_setup_rx_descriptors - Allocate Rx descriptors * @rx_ring: Rx descriptor ring (for a specific queue) to setup @@ -1608,7 +1597,6 @@ int i40e_setup_rx_descriptors(struct i40e_ring *rx_ring) rx_ring->next_to_alloc = 0; rx_ring->next_to_clean = 0; rx_ring->next_to_use = 0; - rx_ring->rx_offset = i40e_rx_offset(rx_ring); /* XDP RX-queue info only needed for RX rings exposed to XDP */ if (rx_ring->vsi->type == I40E_VSI_MAIN) {