staging: fsl-dpaa2/eth: Add DCB support

Add initial DCB ops in the DPAA2 Ethernet driver. Currently they are
dummy calls.

Tested integration with userspace lldpad:
- lldpad daemon running
- bring interface up
- lldptool -L -i niX adminStatus=rxtx
- lldptool -T -i niX -V PFC -c enabled={prio comma separated list}
- lldptool -t -i niX -V PFC -c enabled

Signed-off-by: Bogdan Purcareata <bogdan.purcareata@nxp.com>

2 files changed, 78 insertions, 0 deletions

diff --git a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
index e37e25f..a959d4c 100644
--- a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
+++ b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
@@ -2933,6 +2933,76 @@ static void dpaa2_eth_sysfs_remove(struct device *dev)
 		device_remove_file(dev, &dpaa2_eth_attrs[i]);
 }
 
+#ifdef CONFIG_FSL_DPAA2_ETH_DCB
+static int dpaa2_eth_dcbnl_ieee_getpfc(struct net_device *net_dev,
+				       struct ieee_pfc *pfc)
+{
+	struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
+
+	pfc->pfc_cap = dpaa2_eth_tc_count(priv);
+	pfc->pfc_en = priv->pfc.pfc_en;
+	pfc->mbc = priv->pfc.mbc;
+	pfc->delay = priv->pfc.delay;
+
+	return 0;
+}
+
+static int dpaa2_eth_dcbnl_ieee_setpfc(struct net_device *net_dev,
+				       struct ieee_pfc *pfc)
+{
+	struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
+
+	memcpy(&priv->pfc, pfc, sizeof(priv->pfc));
+
+	return 0;
+}
+
+static u8 dpaa2_eth_dcbnl_getdcbx(struct net_device *net_dev)
+{
+	struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
+
+	return priv->dcbx_mode;
+}
+
+static u8 dpaa2_eth_dcbnl_setdcbx(struct net_device *net_dev, u8 mode)
+{
+	struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
+
+	priv->dcbx_mode = mode;
+	return 0;
+}
+
+static u8 dpaa2_eth_dcbnl_getcap(struct net_device *net_dev, int capid, u8 *cap)
+{
+	struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
+
+	switch (capid) {
+	case DCB_CAP_ATTR_PFC:
+		*cap = true;
+		break;
+	case DCB_CAP_ATTR_PFC_TCS:
+		*cap = 1 << dpaa2_eth_tc_count(priv);
+		break;
+	case DCB_CAP_ATTR_DCBX:
+		*cap = priv->dcbx_mode;
+		break;
+	default:
+		*cap = false;
+		break;
+	}
+
+	return 0;
+}
+
+const struct dcbnl_rtnl_ops dpaa2_eth_dcbnl_ops = {
+	.ieee_getpfc	= dpaa2_eth_dcbnl_ieee_getpfc,
+	.ieee_setpfc	= dpaa2_eth_dcbnl_ieee_setpfc,
+	.getdcbx	= dpaa2_eth_dcbnl_getdcbx,
+	.setdcbx	= dpaa2_eth_dcbnl_setdcbx,
+	.getcap		= dpaa2_eth_dcbnl_getcap,
+};
+#endif
+
 static int dpaa2_eth_probe(struct fsl_mc_device *dpni_dev)
 {
 	struct device *dev;
@@ -3033,6 +3103,10 @@ static int dpaa2_eth_probe(struct fsl_mc_device *dpni_dev)
 		goto err_alloc_rings;
 
 	net_dev->ethtool_ops = &dpaa2_ethtool_ops;
+#ifdef CONFIG_FSL_DPAA2_ETH_DCB
+	net_dev->dcbnl_ops = &dpaa2_eth_dcbnl_ops;
+	priv->dcbx_mode = DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE;
+#endif
 
 	err = setup_irqs(dpni_dev);
 	if (err) {
diff --git a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h
index ce1668c..056c453 100644
--- a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h
+++ b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h
@@ -33,6 +33,7 @@
 #define __DPAA2_ETH_H
 
 #include <linux/atomic.h>
+#include <linux/dcbnl.h>
 #include <linux/netdevice.h>
 #include <linux/if_vlan.h>
 #include "../../fsl-mc/include/dpaa2-io.h"
@@ -431,6 +432,9 @@ struct dpaa2_eth_priv {
 	struct dpaa2_eth_cls_rule *cls_rule;
 
 	struct dpni_tx_shaping_cfg shaping_cfg;
+
+	u8 dcbx_mode;
+	struct ieee_pfc pfc;
 };
 
 #define dpaa2_eth_hash_enabled(priv)	\