[PATCH iwl-next v2 8/9] igc: Add support to get MAC Merge data via ethtool

[Faizal Rahim <faizal.abdul.rahim@linux.intel.com>]

Implement "ethtool --show-mm" callback for IGC.

Tested with command:
$ ethtool --show-mm enp1s0.
  MAC Merge layer state for enp1s0:
  pMAC enabled: on
  TX enabled: on
  TX active: on
  TX minimum fragment size: 64
  RX minimum fragment size: 60
  Verify enabled: on
  Verify time: 128
  Max verify time: 128
  Verification status: SUCCEEDED

Verified that the fields value are retrieved correctly.

Signed-off-by: Faizal Rahim <faizal.abdul.rahim@linux.intel.com>
---
 drivers/net/ethernet/intel/igc/igc_ethtool.c | 14 ++++++++++++++
 drivers/net/ethernet/intel/igc/igc_tsn.h     |  1 +
 2 files changed, 15 insertions(+)

diff --git a/drivers/net/ethernet/intel/igc/igc_ethtool.c b/drivers/net/ethernet/intel/igc/igc_ethtool.c
index 83da59aec59e..0140f2258823 100644
--- a/drivers/net/ethernet/intel/igc/igc_ethtool.c
+++ b/drivers/net/ethernet/intel/igc/igc_ethtool.c
@@ -1782,6 +1782,19 @@ static int igc_ethtool_set_eee(struct net_device *netdev,
 	return 0;
 }
 
+static int igc_ethtool_get_mm(struct net_device *netdev,
+			      struct ethtool_mm_state *cmd)
+{
+	struct igc_adapter *adapter = netdev_priv(netdev);
+	struct fpe_t *fpe = &adapter->fpe;
+
+	ethtool_mmsv_get_mm(&fpe->mmsv, cmd);
+	cmd->tx_min_frag_size = fpe->tx_min_frag_size;
+	cmd->rx_min_frag_size = IGC_RX_MIN_FRAG_SIZE;
+
+	return 0;
+}
+
 static int igc_ethtool_set_mm(struct net_device *netdev,
 			      struct ethtool_mm_cfg *cmd,
 			      struct netlink_ext_ack *extack)
@@ -2091,6 +2104,7 @@ static const struct ethtool_ops igc_ethtool_ops = {
 	.set_rxfh		= igc_ethtool_set_rxfh,
 	.get_ts_info		= igc_ethtool_get_ts_info,
 	.get_channels		= igc_ethtool_get_channels,
+	.get_mm			= igc_ethtool_get_mm,
 	.set_mm			= igc_ethtool_set_mm,
 	.set_channels		= igc_ethtool_set_channels,
 	.get_priv_flags		= igc_ethtool_get_priv_flags,
diff --git a/drivers/net/ethernet/intel/igc/igc_tsn.h b/drivers/net/ethernet/intel/igc/igc_tsn.h
index 898c4630bc70..c82f9718cb85 100644
--- a/drivers/net/ethernet/intel/igc/igc_tsn.h
+++ b/drivers/net/ethernet/intel/igc/igc_tsn.h
@@ -4,6 +4,7 @@
 #ifndef _IGC_TSN_H_
 #define _IGC_TSN_H_
 
+#define IGC_RX_MIN_FRAG_SIZE		60
 #define SMD_FRAME_SIZE			60
 
 DECLARE_STATIC_KEY_FALSE(igc_fpe_enabled);
-- 
2.34.1