igb: Support to read and export SFF-8472/8079 data

This patch adds support to read and export SFF-8472/8079 (SFP data)
over i2c, through Ethtool.

v2: Changed implementation to accommodate any offset within SFF module
    length boundary.

Reported-by: Aurélien Guillaume <footplus@gmail.com>
CC: Aurélien Guillaume <footplus@gmail.com>
CC: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

2 files changed, 89 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/igb/igb.h b/drivers/net/ethernet/intel/igb/igb.h
index 25151401c2ab..7cb039827a0c 100644
--- a/drivers/net/ethernet/intel/igb/igb.h
+++ b/drivers/net/ethernet/intel/igb/igb.h
@@ -178,6 +178,14 @@ enum igb_tx_flags {
 #define TXD_USE_COUNT(S) DIV_ROUND_UP((S), IGB_MAX_DATA_PER_TXD)
 #define DESC_NEEDED (MAX_SKB_FRAGS + 4)
 
+/* EEPROM byte offsets */
+#define IGB_SFF_8472_SWAP               0x5C
+#define IGB_SFF_8472_COMP               0x5E
+
+/* Bitmasks */
+#define IGB_SFF_ADDRESSING_MODE         0x4
+#define IGB_SFF_8472_UNSUP              0x00
+
 /* wrapper around a pointer to a socket buffer,
  * so a DMA handle can be stored along with the buffer */
 struct igb_tx_buffer {
diff --git a/drivers/net/ethernet/intel/igb/igb_ethtool.c b/drivers/net/ethernet/intel/igb/igb_ethtool.c
index 8499c48090c6..6afd7278ad67 100644
--- a/drivers/net/ethernet/intel/igb/igb_ethtool.c
+++ b/drivers/net/ethernet/intel/igb/igb_ethtool.c
@@ -2622,6 +2622,85 @@ static int igb_set_eee(struct net_device *netdev,
         return 0;
 }
 
+static int igb_get_module_info(struct net_device *netdev,
+                               struct ethtool_modinfo *modinfo)
+{
+        struct igb_adapter *adapter = netdev_priv(netdev);
+        struct e1000_hw *hw = &adapter->hw;
+        u32 status = E1000_SUCCESS;
+        u16 sff8472_rev, addr_mode;
+        bool page_swap = false;
+
+        if ((hw->phy.media_type == e1000_media_type_copper) ||
+            (hw->phy.media_type == e1000_media_type_unknown))
+                return -EOPNOTSUPP;
+
+        /* Check whether we support SFF-8472 or not */
+        status = igb_read_phy_reg_i2c(hw, IGB_SFF_8472_COMP, &sff8472_rev);
+        if (status != E1000_SUCCESS)
+                return -EIO;
+
+        /* addressing mode is not supported */
+        status = igb_read_phy_reg_i2c(hw, IGB_SFF_8472_SWAP, &addr_mode);
+        if (status != E1000_SUCCESS)
+                return -EIO;
+
+        /* addressing mode is not supported */
+        if ((addr_mode & 0xFF) & IGB_SFF_ADDRESSING_MODE) {
+                hw_dbg("Address change required to access page 0xA2, but not supported. Please report the module type to the driver maintainers.\n");
+                page_swap = true;
+        }
+
+        if ((sff8472_rev & 0xFF) == IGB_SFF_8472_UNSUP || page_swap) {
+                /* We have an SFP, but it does not support SFF-8472 */
+                modinfo->type = ETH_MODULE_SFF_8079;
+                modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
+        } else {
+                /* We have an SFP which supports a revision of SFF-8472 */
+                modinfo->type = ETH_MODULE_SFF_8472;
+                modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN;
+        }
+
+        return 0;
+}
+
+static int igb_get_module_eeprom(struct net_device *netdev,
+                                 struct ethtool_eeprom *ee, u8 *data)
+{
+        struct igb_adapter *adapter = netdev_priv(netdev);
+        struct e1000_hw *hw = &adapter->hw;
+        u32 status = E1000_SUCCESS;
+        u16 *dataword;
+        u16 first_word, last_word;
+        int i = 0;
+
+        if (ee->len == 0)
+                return -EINVAL;
+
+        first_word = ee->offset >> 1;
+        last_word = (ee->offset + ee->len - 1) >> 1;
+
+        dataword = kmalloc(sizeof(u16) * (last_word - first_word + 1),
+                           GFP_KERNEL);
+        if (!dataword)
+                return -ENOMEM;
+
+        /* Read EEPROM block, SFF-8079/SFF-8472, word at a time */
+        for (i = 0; i < last_word - first_word + 1; i++) {
+                status = igb_read_phy_reg_i2c(hw, first_word + i, &dataword[i]);
+                if (status != E1000_SUCCESS)
+                        /* Error occurred while reading module */
+                        return -EIO;
+
+                be16_to_cpus(&dataword[i]);
+        }
+
+        memcpy(data, (u8 *)dataword + (ee->offset & 1), ee->len);
+        kfree(dataword);
+
+        return 0;
+}
+
 static int igb_ethtool_begin(struct net_device *netdev)
 {
         struct igb_adapter *adapter = netdev_priv(netdev);
@@ -2666,6 +2745,8 @@ static const struct ethtool_ops igb_ethtool_ops = {
         .set_rxnfc              = igb_set_rxnfc,
         .get_eee                = igb_get_eee,
         .set_eee                = igb_set_eee,
+        .get_module_info        = igb_get_module_info,
+        .get_module_eeprom      = igb_get_module_eeprom,
         .begin                  = igb_ethtool_begin,
         .complete               = igb_ethtool_complete,
 };