cxgb3: Remove t3_seeprom_read and use VPD API

Using the VPD API allows to simplify the code and completely get rid
of t3_seeprom_read(). Note that we don't have to use pci_read_vpd_any()
here because a VPD quirk sets dev->vpd.len to the full EEPROM size.

Tested with a T320 card.

Link: https://lore.kernel.org/r/68ef15bb-b6bf-40ad-160c-aaa72c4a70f8@gmail.comSigned-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/chelsio/cxgb3/common.h

@@ -676,7 +676,6 @@ void t3_link_changed(struct adapter *adapter, int port_id);
 void t3_link_fault(struct adapter *adapter, int port_id);
 int t3_link_start(struct cphy *phy, struct cmac *mac, struct link_config *lc);
 const struct adapter_info *t3_get_adapter_info(unsigned int board_id);
-int t3_seeprom_read(struct adapter *adapter, u32 addr, __le32 *data);
 int t3_seeprom_write(struct adapter *adapter, u32 addr, __le32 data);
 int t3_seeprom_wp(struct adapter *adapter, int enable);
 int t3_get_tp_version(struct adapter *adapter, u32 *vers);

drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c

@@ -2036,20 +2036,16 @@ static int get_eeprom(struct net_device *dev, struct ethtool_eeprom *e,
 {
 	struct port_info *pi = netdev_priv(dev);
 	struct adapter *adapter = pi->adapter;
-	int i, err = 0;
-
-	u8 *buf = kmalloc(EEPROMSIZE, GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
+	int cnt;
 
 	e->magic = EEPROM_MAGIC;
-	for (i = e->offset & ~3; !err && i < e->offset + e->len; i += 4)
-		err = t3_seeprom_read(adapter, i, (__le32 *) & buf[i]);
+	cnt = pci_read_vpd(adapter->pdev, e->offset, e->len, data);
+	if (cnt < 0)
+		return cnt;
 
-	if (!err)
-		memcpy(data, buf + e->offset, e->len);
-	kfree(buf);
-	return err;
+	e->len = cnt;
+
+	return 0;
 }
 
 static int set_eeprom(struct net_device *dev, struct ethtool_eeprom *eeprom,
@@ -2072,12 +2068,9 @@ static int set_eeprom(struct net_device *dev, struct ethtool_eeprom *eeprom,
 		buf = kmalloc(aligned_len, GFP_KERNEL);
 		if (!buf)
 			return -ENOMEM;
-		err = t3_seeprom_read(adapter, aligned_offset, (__le32 *) buf);
-		if (!err && aligned_len > 4)
-			err = t3_seeprom_read(adapter,
-					      aligned_offset + aligned_len - 4,
-					      (__le32 *) & buf[aligned_len - 4]);
-		if (err)
+		err = pci_read_vpd(adapter->pdev, aligned_offset, aligned_len,
+				   buf);
+		if (err < 0)
 			goto out;
 		memcpy(buf + (eeprom->offset & 3), data, eeprom->len);
 	} else

drivers/net/ethernet/chelsio/cxgb3/t3_hw.c

@@ -599,42 +599,6 @@ struct t3_vpd {
 #define EEPROM_STAT_ADDR  0x4000
 #define VPD_BASE          0xc00
 
-/**
- *	t3_seeprom_read - read a VPD EEPROM location
- *	@adapter: adapter to read
- *	@addr: EEPROM address
- *	@data: where to store the read data
- *
- *	Read a 32-bit word from a location in VPD EEPROM using the card's PCI
- *	VPD ROM capability.  A zero is written to the flag bit when the
- *	address is written to the control register.  The hardware device will
- *	set the flag to 1 when 4 bytes have been read into the data register.
- */
-int t3_seeprom_read(struct adapter *adapter, u32 addr, __le32 *data)
-{
-	u16 val;
-	int attempts = EEPROM_MAX_POLL;
-	u32 v;
-	unsigned int base = adapter->params.pci.vpd_cap_addr;
-
-	if ((addr >= EEPROMSIZE && addr != EEPROM_STAT_ADDR) || (addr & 3))
-		return -EINVAL;
-
-	pci_write_config_word(adapter->pdev, base + PCI_VPD_ADDR, addr);
-	do {
-		udelay(10);
-		pci_read_config_word(adapter->pdev, base + PCI_VPD_ADDR, &val);
-	} while (!(val & PCI_VPD_ADDR_F) && --attempts);
-
-	if (!(val & PCI_VPD_ADDR_F)) {
-		CH_ERR(adapter, "reading EEPROM address 0x%x failed\n", addr);
-		return -EIO;
-	}
-	pci_read_config_dword(adapter->pdev, base + PCI_VPD_DATA, &v);
-	*data = cpu_to_le32(v);
-	return 0;
-}
-
 /**
  *	t3_seeprom_write - write a VPD EEPROM location
  *	@adapter: adapter to write
@@ -708,24 +672,22 @@ static int vpdstrtou16(char *s, u8 len, unsigned int base, u16 *val)
  */
 static int get_vpd_params(struct adapter *adapter, struct vpd_params *p)
 {
-	int i, addr, ret;
 	struct t3_vpd vpd;
+	u8 base_val = 0;
+	int addr, ret;
 
 	/*
 	 * Card information is normally at VPD_BASE but some early cards had
 	 * it at 0.
 	 */
-	ret = t3_seeprom_read(adapter, VPD_BASE, (__le32 *)&vpd);
-	if (ret)
+	ret = pci_read_vpd(adapter->pdev, VPD_BASE, 1, &base_val);
+	if (ret < 0)
 		return ret;
-	addr = vpd.id_tag == 0x82 ? VPD_BASE : 0;
+	addr = base_val == PCI_VPD_LRDT_ID_STRING ? VPD_BASE : 0;
 
-	for (i = 0; i < sizeof(vpd); i += 4) {
-		ret = t3_seeprom_read(adapter, addr + i,
-				      (__le32 *)((u8 *)&vpd + i));
-		if (ret)
-			return ret;
-	}
+	ret = pci_read_vpd(adapter->pdev, addr, sizeof(vpd), &vpd);
+	if (ret < 0)
+		return ret;
 
 	ret = vpdstrtouint(vpd.cclk_data, vpd.cclk_len, 10, &p->cclk);
 	if (ret)