netdev - [PATCH net-next] sky2: use PCI VPD API in eeprom ethtool ops

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Date:   Thu, 18 Nov 2021 21:04:23 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Mirko Lindner <mlindner@...vell.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next] sky2: use PCI VPD API in eeprom ethtool ops

Recently pci_read/write_vpd_any() have been added to the PCI VPD API.
These functions allow to access VPD address space outside the
auto-detected VPD, and they can be used to significantly simplify the
eeprom ethtool ops.

Tested with a 88E8070 card with 1KB EEPROM.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/ethernet/marvell/sky2.c | 84 +++++------------------------
 1 file changed, 12 insertions(+), 72 deletions(-)

diff --git a/drivers/net/ethernet/marvell/sky2.c b/drivers/net/ethernet/marvell/sky2.c
index e9fc74e54..5ed44a191 100644
--- a/drivers/net/ethernet/marvell/sky2.c
+++ b/drivers/net/ethernet/marvell/sky2.c
@@ -4266,96 +4266,36 @@ static int sky2_get_eeprom_len(struct net_device *dev)
 	return 1 << ( ((reg2 & PCI_VPD_ROM_SZ) >> 14) + 8);
 }
 
-static int sky2_vpd_wait(const struct sky2_hw *hw, int cap, u16 busy)
-{
-	unsigned long start = jiffies;
-
-	while ( (sky2_pci_read16(hw, cap + PCI_VPD_ADDR) & PCI_VPD_ADDR_F) == busy) {
-		/* Can take up to 10.6 ms for write */
-		if (time_after(jiffies, start + HZ/4)) {
-			dev_err(&hw->pdev->dev, "VPD cycle timed out\n");
-			return -ETIMEDOUT;
-		}
-		msleep(1);
-	}
-
-	return 0;
-}
-
-static int sky2_vpd_read(struct sky2_hw *hw, int cap, void *data,
-			 u16 offset, size_t length)
-{
-	int rc = 0;
-
-	while (length > 0) {
-		u32 val;
-
-		sky2_pci_write16(hw, cap + PCI_VPD_ADDR, offset);
-		rc = sky2_vpd_wait(hw, cap, 0);
-		if (rc)
-			break;
-
-		val = sky2_pci_read32(hw, cap + PCI_VPD_DATA);
-
-		memcpy(data, &val, min(sizeof(val), length));
-		offset += sizeof(u32);
-		data += sizeof(u32);
-		length -= sizeof(u32);
-	}
-
-	return rc;
-}
-
-static int sky2_vpd_write(struct sky2_hw *hw, int cap, const void *data,
-			  u16 offset, unsigned int length)
-{
-	unsigned int i;
-	int rc = 0;
-
-	for (i = 0; i < length; i += sizeof(u32)) {
-		u32 val = *(u32 *)(data + i);
-
-		sky2_pci_write32(hw, cap + PCI_VPD_DATA, val);
-		sky2_pci_write32(hw, cap + PCI_VPD_ADDR, offset | PCI_VPD_ADDR_F);
-
-		rc = sky2_vpd_wait(hw, cap, PCI_VPD_ADDR_F);
-		if (rc)
-			break;
-	}
-	return rc;
-}
-
 static int sky2_get_eeprom(struct net_device *dev, struct ethtool_eeprom *eeprom,
 			   u8 *data)
 {
 	struct sky2_port *sky2 = netdev_priv(dev);
-	int cap = pci_find_capability(sky2->hw->pdev, PCI_CAP_ID_VPD);
-
-	if (!cap)
-		return -EINVAL;
+	int rc;
 
 	eeprom->magic = SKY2_EEPROM_MAGIC;
+	rc = pci_read_vpd_any(sky2->hw->pdev, eeprom->offset, eeprom->len,
+			      data);
+	if (rc < 0)
+		return rc;
+
+	eeprom->len = rc;
 
-	return sky2_vpd_read(sky2->hw, cap, data, eeprom->offset, eeprom->len);
+	return 0;
 }
 
 static int sky2_set_eeprom(struct net_device *dev, struct ethtool_eeprom *eeprom,
 			   u8 *data)
 {
 	struct sky2_port *sky2 = netdev_priv(dev);
-	int cap = pci_find_capability(sky2->hw->pdev, PCI_CAP_ID_VPD);
-
-	if (!cap)
-		return -EINVAL;
+	int rc;
 
 	if (eeprom->magic != SKY2_EEPROM_MAGIC)
 		return -EINVAL;
 
-	/* Partial writes not supported */
-	if ((eeprom->offset & 3) || (eeprom->len & 3))
-		return -EINVAL;
+	rc = pci_write_vpd_any(sky2->hw->pdev, eeprom->offset, eeprom->len,
+			       data);
 
-	return sky2_vpd_write(sky2->hw, cap, data, eeprom->offset, eeprom->len);
+	return rc < 0 ? rc : 0;
 }
 
 static netdev_features_t sky2_fix_features(struct net_device *dev,
-- 
2.33.0