From: Casey Leedom <leedom@chelsio.com>
Date: Thu, 27 Jul 2017 16:47:28 -0700
Subject: cxgb4: ethtool forward error correction management support
Patch-mainline: v4.14-rc1
Git-commit: 7fece840e35e52c7114dcf874a72b2c962923800
References: bsc#1046540 FATE#322930

Signed-off-by: Casey Leedom <leedom@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_ethtool.c |  100 +++++++++++++++++++++
 1 file changed, 100 insertions(+)

--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ethtool.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ethtool.c
@@ -801,6 +801,104 @@ static int set_link_ksettings(struct net
 	return ret;
 }
 
+/* Translate the Firmware FEC value into the ethtool value. */
+static inline unsigned int fwcap_to_eth_fec(unsigned int fw_fec)
+{
+	unsigned int eth_fec = 0;
+
+	if (fw_fec & FW_PORT_CAP_FEC_RS)
+		eth_fec |= ETHTOOL_FEC_RS;
+	if (fw_fec & FW_PORT_CAP_FEC_BASER_RS)
+		eth_fec |= ETHTOOL_FEC_BASER;
+
+	/* if nothing is set, then FEC is off */
+	if (!eth_fec)
+		eth_fec = ETHTOOL_FEC_OFF;
+
+	return eth_fec;
+}
+
+/* Translate Common Code FEC value into ethtool value. */
+static inline unsigned int cc_to_eth_fec(unsigned int cc_fec)
+{
+	unsigned int eth_fec = 0;
+
+	if (cc_fec & FEC_AUTO)
+		eth_fec |= ETHTOOL_FEC_AUTO;
+	if (cc_fec & FEC_RS)
+		eth_fec |= ETHTOOL_FEC_RS;
+	if (cc_fec & FEC_BASER_RS)
+		eth_fec |= ETHTOOL_FEC_BASER;
+
+	/* if nothing is set, then FEC is off */
+	if (!eth_fec)
+		eth_fec = ETHTOOL_FEC_OFF;
+
+	return eth_fec;
+}
+
+/* Translate ethtool FEC value into Common Code value. */
+static inline unsigned int eth_to_cc_fec(unsigned int eth_fec)
+{
+	unsigned int cc_fec = 0;
+
+	if (eth_fec & ETHTOOL_FEC_OFF)
+		return cc_fec;
+
+	if (eth_fec & ETHTOOL_FEC_AUTO)
+		cc_fec |= FEC_AUTO;
+	if (eth_fec & ETHTOOL_FEC_RS)
+		cc_fec |= FEC_RS;
+	if (eth_fec & ETHTOOL_FEC_BASER)
+		cc_fec |= FEC_BASER_RS;
+
+	return cc_fec;
+}
+
+static int get_fecparam(struct net_device *dev, struct ethtool_fecparam *fec)
+{
+	const struct port_info *pi = netdev_priv(dev);
+	const struct link_config *lc = &pi->link_cfg;
+
+	/* Translate the Firmware FEC Support into the ethtool value.  We
+	 * always support IEEE 802.3 "automatic" selection of Link FEC type if
+	 * any FEC is supported.
+	 */
+	fec->fec = fwcap_to_eth_fec(lc->supported);
+	if (fec->fec != ETHTOOL_FEC_OFF)
+		fec->fec |= ETHTOOL_FEC_AUTO;
+
+	/* Translate the current internal FEC parameters into the
+	 * ethtool values.
+	 */
+	fec->active_fec = cc_to_eth_fec(lc->fec);
+
+	return 0;
+}
+
+static int set_fecparam(struct net_device *dev, struct ethtool_fecparam *fec)
+{
+	struct port_info *pi = netdev_priv(dev);
+	struct link_config *lc = &pi->link_cfg;
+	struct link_config old_lc;
+	int ret;
+
+	/* Save old Link Configuration in case the L1 Configure below
+	 * fails.
+	 */
+	old_lc = *lc;
+
+	/* Try to perform the L1 Configure and return the result of that
+	 * effort.  If it fails, revert the attempted change.
+	 */
+	lc->requested_fec = eth_to_cc_fec(fec->fec);
+	ret = t4_link_l1cfg(pi->adapter, pi->adapter->mbox,
+			    pi->tx_chan, lc);
+	if (ret)
+		*lc = old_lc;
+	return ret;
+}
+
 static void get_pauseparam(struct net_device *dev,
 			   struct ethtool_pauseparam *epause)
 {
@@ -1255,6 +1353,8 @@ static int get_rxnfc(struct net_device *
 static const struct ethtool_ops cxgb_ethtool_ops = {
 	.get_link_ksettings = get_link_ksettings,
 	.set_link_ksettings = set_link_ksettings,
+	.get_fecparam      = get_fecparam,
+	.set_fecparam      = set_fecparam,
 	.get_drvinfo       = get_drvinfo,
 	.get_msglevel      = get_msglevel,
 	.set_msglevel      = set_msglevel,