From patchwork Sun Jan 9 13:53:27 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe JAILLET X-Patchwork-Id: 12707789 X-Patchwork-Delegate: kuba@kernel.org 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 E4D2BC433EF for ; Sun, 9 Jan 2022 13:53:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235737AbiAINxd (ORCPT ); Sun, 9 Jan 2022 08:53:33 -0500 Received: from smtp09.smtpout.orange.fr ([80.12.242.131]:51599 "EHLO smtp.smtpout.orange.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234024AbiAINxd (ORCPT ); Sun, 9 Jan 2022 08:53:33 -0500 Received: from pop-os.home ([90.11.185.88]) by smtp.orange.fr with ESMTPA id 6YdXnCf5oUujj6YdXnIXeC; Sun, 09 Jan 2022 14:53:32 +0100 X-ME-Helo: pop-os.home X-ME-Auth: YWZlNiIxYWMyZDliZWIzOTcwYTEyYzlhMmU3ZiQ1M2U2MzfzZDfyZTMxZTBkMTYyNDBjNDJlZmQ3ZQ== X-ME-Date: Sun, 09 Jan 2022 14:53:32 +0100 X-ME-IP: 90.11.185.88 From: Christophe JAILLET To: Raju Rangoju , "David S. Miller" , Jakub Kicinski Cc: linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org, Christophe JAILLET , netdev@vger.kernel.org Subject: [PATCH] cxgb4: Remove useless DMA-32 fallback configuration Date: Sun, 9 Jan 2022 14:53:27 +0100 Message-Id: <56db10d53be0897ff1be5f37d64b91cb7e1d932c.1641736387.git.christophe.jaillet@wanadoo.fr> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org As stated in [1], dma_set_mask() with a 64-bit mask never fails if dev->dma_mask is non-NULL. So, if it fails, the 32 bits case will also fail for the same reason. So, if dma_set_mask_and_coherent() succeeds, 'highdma' is known to be true. Simplify code and remove some dead code accordingly. [1]: https://lkml.org/lkml/2021/6/7/398 Signed-off-by: Christophe JAILLET --- drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c | 17 +++++------------ 1 file changed, 5 insertions(+), 12 deletions(-) diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c index dde1cf51d0ab..0c78c0db8937 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c @@ -6608,7 +6608,6 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent) static int adap_idx = 1; int s_qpp, qpp, num_seg; struct port_info *pi; - bool highdma = false; enum chip_type chip; void __iomem *regs; int func, chip_ver; @@ -6687,14 +6686,10 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent) return 0; } - if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) { - highdma = true; - } else { - err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); - if (err) { - dev_err(&pdev->dev, "no usable DMA configuration\n"); - goto out_free_adapter; - } + err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); + if (err) { + dev_err(&pdev->dev, "no usable DMA configuration\n"); + goto out_free_adapter; } pci_enable_pcie_error_reporting(pdev); @@ -6823,7 +6818,7 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent) NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM | NETIF_F_RXHASH | NETIF_F_GRO | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | - NETIF_F_HW_TC | NETIF_F_NTUPLE; + NETIF_F_HW_TC | NETIF_F_NTUPLE | NETIF_F_HIGHDMA; if (chip_ver > CHELSIO_T5) { netdev->hw_enc_features |= NETIF_F_IP_CSUM | @@ -6841,8 +6836,6 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent) netdev->udp_tunnel_nic_info = &cxgb_udp_tunnels; } - if (highdma) - netdev->hw_features |= NETIF_F_HIGHDMA; netdev->features |= netdev->hw_features; netdev->vlan_features = netdev->features & VLAN_FEAT; #if IS_ENABLED(CONFIG_CHELSIO_TLS_DEVICE)