From patchwork Fri Jun 19 06:22:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Kirsher X-Patchwork-Id: 217560 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=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 7A8F4C433E0 for ; Fri, 19 Jun 2020 06:22:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 62ECB2078D for ; Fri, 19 Jun 2020 06:22:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728109AbgFSGWQ (ORCPT ); Fri, 19 Jun 2020 02:22:16 -0400 Received: from mga18.intel.com ([134.134.136.126]:50185 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725290AbgFSGWQ (ORCPT ); Fri, 19 Jun 2020 02:22:16 -0400 IronPort-SDR: kDNLAnhRy1LUZrUB7oYV2uzwJd2LH8Ym5Per5qiEYIGUoRDmrlYRR/sfrpfDLu2eNI43wEk66T ZnubQP8kW4wQ== X-IronPort-AV: E=McAfee;i="6000,8403,9656"; a="130229728" X-IronPort-AV: E=Sophos;i="5.75,253,1589266800"; d="scan'208";a="130229728" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Jun 2020 23:22:13 -0700 IronPort-SDR: WDsxgGjAaHjL+WGxVKljHzhUeJP4/pwm+zkmeh26dQtfb98/hiEaQKwabohCgl4bSJt1wPN+y9 A6YkZUATqOig== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,253,1589266800"; d="scan'208";a="421753963" Received: from jtkirshe-desk1.jf.intel.com ([134.134.177.86]) by orsmga004.jf.intel.com with ESMTP; 18 Jun 2020 23:22:13 -0700 From: Jeff Kirsher To: davem@davemloft.net Cc: Ciara Loftus , netdev@vger.kernel.org, nhorman@redhat.com, sassmann@redhat.com, Andrew Bowers , Jeff Kirsher Subject: [net 3/4] ice: protect ring accesses with WRITE_ONCE Date: Thu, 18 Jun 2020 23:22:09 -0700 Message-Id: <20200619062210.3159291-4-jeffrey.t.kirsher@intel.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200619062210.3159291-1-jeffrey.t.kirsher@intel.com> References: <20200619062210.3159291-1-jeffrey.t.kirsher@intel.com> MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Ciara Loftus The READ_ONCE macro is used when reading rings prior to accessing the statistics pointer. The corresponding WRITE_ONCE usage when allocating and freeing the rings to ensure protected access was not in place. Introduce this. Signed-off-by: Ciara Loftus Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/ice/ice_lib.c | 8 ++++---- drivers/net/ethernet/intel/ice/ice_main.c | 2 +- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c index 28b46cc9f5cb..2e3a39cea2c0 100644 --- a/drivers/net/ethernet/intel/ice/ice_lib.c +++ b/drivers/net/ethernet/intel/ice/ice_lib.c @@ -1194,7 +1194,7 @@ static void ice_vsi_clear_rings(struct ice_vsi *vsi) for (i = 0; i < vsi->alloc_txq; i++) { if (vsi->tx_rings[i]) { kfree_rcu(vsi->tx_rings[i], rcu); - vsi->tx_rings[i] = NULL; + WRITE_ONCE(vsi->tx_rings[i], NULL); } } } @@ -1202,7 +1202,7 @@ static void ice_vsi_clear_rings(struct ice_vsi *vsi) for (i = 0; i < vsi->alloc_rxq; i++) { if (vsi->rx_rings[i]) { kfree_rcu(vsi->rx_rings[i], rcu); - vsi->rx_rings[i] = NULL; + WRITE_ONCE(vsi->rx_rings[i], NULL); } } } @@ -1235,7 +1235,7 @@ static int ice_vsi_alloc_rings(struct ice_vsi *vsi) ring->vsi = vsi; ring->dev = dev; ring->count = vsi->num_tx_desc; - vsi->tx_rings[i] = ring; + WRITE_ONCE(vsi->tx_rings[i], ring); } /* Allocate Rx rings */ @@ -1254,7 +1254,7 @@ static int ice_vsi_alloc_rings(struct ice_vsi *vsi) ring->netdev = vsi->netdev; ring->dev = dev; ring->count = vsi->num_rx_desc; - vsi->rx_rings[i] = ring; + WRITE_ONCE(vsi->rx_rings[i], ring); } return 0; diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c index 082825e3cb39..4cbd49c87568 100644 --- a/drivers/net/ethernet/intel/ice/ice_main.c +++ b/drivers/net/ethernet/intel/ice/ice_main.c @@ -1702,7 +1702,7 @@ static int ice_xdp_alloc_setup_rings(struct ice_vsi *vsi) xdp_ring->netdev = NULL; xdp_ring->dev = dev; xdp_ring->count = vsi->num_tx_desc; - vsi->xdp_rings[i] = xdp_ring; + WRITE_ONCE(vsi->xdp_rings[i], xdp_ring); if (ice_setup_tx_ring(xdp_ring)) goto free_xdp_rings; ice_set_ring_xdp(xdp_ring);