ice: Implement support for normal get_eeprom[_len] ethtool ops

Add support for get_eeprom and get_eeprom_len ethtool ops

Specification states that PF software accesses NVM (shadow-ram) via AQ
commands (e.g. NVM Read, NVM Write) in the range 0x000000-0x00FFFF (64KB),
so the get_eeprom_len op should return 64KB.  If additional regions of the
16MB NVM must be read, another access method must be used.

The ethtool kernel code, by default, will ask for multiple page-size hunks
of the NVM not to exceed the value returned by ice_get_eeprom_len().
ice_read_sr_buf() deals with arch page sizes different than 4KB.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
index 6facb0a7eed4..2a0bcd460d23 100644
--- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
+++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
@@ -203,6 +203,55 @@ static void ice_set_msglevel(struct net_device *netdev, u32 data)
 #endif /* !CONFIG_DYNAMIC_DEBUG */
 }
 
+static int ice_get_eeprom_len(struct net_device *netdev)
+{
+	struct ice_netdev_priv *np = netdev_priv(netdev);
+	struct ice_pf *pf = np->vsi->back;
+
+	return (int)(pf->hw.nvm.sr_words * sizeof(u16));
+}
+
+static int
+ice_get_eeprom(struct net_device *netdev, struct ethtool_eeprom *eeprom,
+	       u8 *bytes)
+{
+	struct ice_netdev_priv *np = netdev_priv(netdev);
+	u16 first_word, last_word, nwords;
+	struct ice_vsi *vsi = np->vsi;
+	struct ice_pf *pf = vsi->back;
+	struct ice_hw *hw = &pf->hw;
+	enum ice_status status;
+	struct device *dev;
+	int ret = 0;
+	u16 *buf;
+
+	dev = &pf->pdev->dev;
+
+	eeprom->magic = hw->vendor_id | (hw->device_id << 16);
+
+	first_word = eeprom->offset >> 1;
+	last_word = (eeprom->offset + eeprom->len - 1) >> 1;
+	nwords = last_word - first_word + 1;
+
+	buf = devm_kcalloc(dev, nwords, sizeof(u16), GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	status = ice_read_sr_buf(hw, first_word, &nwords, buf);
+	if (status) {
+		dev_err(dev, "ice_read_sr_buf failed, err %d aq_err %d\n",
+			status, hw->adminq.sq_last_status);
+		eeprom->len = sizeof(u16) * nwords;
+		ret = -EIO;
+		goto out;
+	}
+
+	memcpy(bytes, (u8 *)buf + (eeprom->offset & 1), eeprom->len);
+out:
+	devm_kfree(dev, buf);
+	return ret;
+}
+
 static void ice_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
 {
 	struct ice_netdev_priv *np = netdev_priv(netdev);
@@ -1699,6 +1748,8 @@ static const struct ethtool_ops ice_ethtool_ops = {
 	.get_msglevel           = ice_get_msglevel,
 	.set_msglevel           = ice_set_msglevel,
 	.get_link		= ethtool_op_get_link,
+	.get_eeprom_len		= ice_get_eeprom_len,
+	.get_eeprom		= ice_get_eeprom,
 	.get_strings		= ice_get_strings,
 	.set_phys_id		= ice_set_phys_id,
 	.get_ethtool_stats      = ice_get_ethtool_stats,