From patchwork Sat Jan 19 00:33:11 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saeed Mahameed X-Patchwork-Id: 10771867 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3D8276C5 for ; Sat, 19 Jan 2019 00:33:46 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2E9B730851 for ; Sat, 19 Jan 2019 00:33:46 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2322030853; Sat, 19 Jan 2019 00:33:46 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C1B2C30851 for ; Sat, 19 Jan 2019 00:33:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730288AbfASAdk (ORCPT ); Fri, 18 Jan 2019 19:33:40 -0500 Received: from mail-il-dmz.mellanox.com ([193.47.165.129]:60996 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730215AbfASAdk (ORCPT ); Fri, 18 Jan 2019 19:33:40 -0500 Received: from Internal Mail-Server by MTLPINE1 (envelope-from saeedm@mellanox.com) with ESMTPS (AES256-SHA encrypted); 19 Jan 2019 02:33:34 +0200 Received: from sx1.mtl.com ([172.16.5.71]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id x0J0XP7p002420; Sat, 19 Jan 2019 02:33:31 +0200 From: Saeed Mahameed To: Leon Romanovsky , saeedm@mellanox.com Cc: netdev@vger.kernel.org, linux-rdma@vger.kernel.org, Jason Gunthorpe , Michael Guralnik , Majd Dibbiny Subject: [PATCH mlx5-next 2/4] net/mlx5: Add pci AtomicOps request Date: Fri, 18 Jan 2019 16:33:11 -0800 Message-Id: <20190119003313.16711-3-saeedm@mellanox.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190119003313.16711-1-saeedm@mellanox.com> References: <20190119003313.16711-1-saeedm@mellanox.com> MIME-Version: 1.0 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Michael Guralnik Calling pci_enable_atomic_ops_to_root enables AtomicOp requests to pci root port. AtomicOp requests will be enabled only if the completer and all intermediate pci bridges support PCI atomic operations. This, together with appropriate settings in the NVCONFIG should enable PCI atomic operations on the device. PCI atomic operations were first introduced in PCI Express Base Specification 2.1. The Supported operations are Swap (Unconditional Swap), CAS (Compare and Swap) and FetchAdd (Fetch and Add). Unlike other atomic operation modes PCI atomic operations gives the user the option to do atomic operations on local memory, without involving verbs api, without it compromising the operation's atomicity. Signed-off-by: Michael Guralnik Reviewed-by: Majd Dibbiny Signed-off-by: Saeed Mahameed --- drivers/net/ethernet/mellanox/mlx5/core/main.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c index be81b319b0dc..085e1133b8d5 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/main.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c @@ -693,6 +693,11 @@ static int mlx5_pci_init(struct mlx5_core_dev *dev, struct mlx5_priv *priv) goto err_clr_master; } + if (pci_enable_atomic_ops_to_root(pdev, PCI_EXP_DEVCAP2_ATOMIC_COMP32) && + pci_enable_atomic_ops_to_root(pdev, PCI_EXP_DEVCAP2_ATOMIC_COMP64) && + pci_enable_atomic_ops_to_root(pdev, PCI_EXP_DEVCAP2_ATOMIC_COMP128)) + mlx5_core_dbg(dev, "Enabling pci atomics failed\n"); + dev->iseg_base = pci_resource_start(dev->pdev, 0); dev->iseg = ioremap(dev->iseg_base, sizeof(*dev->iseg)); if (!dev->iseg) {