linux-kernel - [PATCH v4 3/3] e1000e: Use pcie_capability_read

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Message-Id: <20231121123428.20907-4-ilpo.jarvinen@linux.intel.com>
Date:   Tue, 21 Nov 2023 14:34:28 +0200
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        intel-wired-lan@...ts.osuosl.org, Jakub Kicinski <kuba@...nel.org>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        linux-kernel@...r.kernel.org
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH v4 3/3] e1000e: Use pcie_capability_read_word() for reading LNKSTA

Use pcie_capability_read_word() for reading LNKSTA and remove the
custom define that matches to PCI_EXP_LNKSTA.

As only single user for cap_offset remains, replace it with a call to
pci_pcie_cap(). Instead of e1000_adapter, make local variable out of
pci_dev because both users are interested in it.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
 drivers/net/ethernet/intel/e1000e/defines.h |  1 -
 drivers/net/ethernet/intel/e1000e/mac.c     | 11 ++++-------
 2 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/defines.h b/drivers/net/ethernet/intel/e1000e/defines.h
index a4d29c9e03a6..23a58cada43a 100644
--- a/drivers/net/ethernet/intel/e1000e/defines.h
+++ b/drivers/net/ethernet/intel/e1000e/defines.h
@@ -678,7 +678,6 @@
 
 /* PCI/PCI-X/PCI-EX Config space */
 #define PCI_HEADER_TYPE_REGISTER     0x0E
-#define PCIE_LINK_STATUS             0x12
 
 #define PCI_HEADER_TYPE_MULTIFUNC    0x80
 
diff --git a/drivers/net/ethernet/intel/e1000e/mac.c b/drivers/net/ethernet/intel/e1000e/mac.c
index 5340cf73778d..694a779e718d 100644
--- a/drivers/net/ethernet/intel/e1000e/mac.c
+++ b/drivers/net/ethernet/intel/e1000e/mac.c
@@ -17,16 +17,13 @@ s32 e1000e_get_bus_info_pcie(struct e1000_hw *hw)
 {
 	struct e1000_mac_info *mac = &hw->mac;
 	struct e1000_bus_info *bus = &hw->bus;
-	struct e1000_adapter *adapter = hw->adapter;
-	u16 pcie_link_status, cap_offset;
+	struct pci_dev *pdev = hw->adapter->pdev;
+	u16 pcie_link_status;
 
-	cap_offset = adapter->pdev->pcie_cap;
-	if (!cap_offset) {
+	if (!pci_pcie_cap(pdev)) {
 		bus->width = e1000_bus_width_unknown;
 	} else {
-		pci_read_config_word(adapter->pdev,
-				     cap_offset + PCIE_LINK_STATUS,
-				     &pcie_link_status);
+		pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &pcie_link_status);
 		bus->width = (enum e1000_bus_width)FIELD_GET(PCI_EXP_LNKSTA_NLW,
 							     pcie_link_status);
 	}
-- 
2.30.2