nfp: ethtool: support TX/RX pause frame on/off

Add support for ethtool -A tx on/off and rx on/off.

Signed-off-by: Yu Xiao <yu.xiao@corigine.com>
Signed-off-by: Louis Peens <louis.peens@corigine.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20231127055116.6668-1-louis.peens@corigine.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: macris-xiao

drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c

@@ -2235,6 +2235,30 @@ static int nfp_net_set_channels(struct net_device *netdev,
 	return nfp_net_set_num_rings(nn, total_rx, total_tx);
 }
 
+static int nfp_port_set_pauseparam(struct net_device *netdev,
+				   struct ethtool_pauseparam *pause)
+{
+	struct nfp_eth_table_port *eth_port;
+	struct nfp_port *port;
+	int err;
+
+	port = nfp_port_from_netdev(netdev);
+	eth_port = nfp_port_get_eth_port(port);
+	if (!eth_port)
+		return -EOPNOTSUPP;
+
+	if (pause->autoneg != AUTONEG_DISABLE)
+		return -EOPNOTSUPP;
+
+	err = nfp_eth_set_pauseparam(port->app->cpp, eth_port->index,
+				     pause->tx_pause, pause->rx_pause);
+	if (!err)
+		/* Only refresh if we did something */
+		nfp_net_refresh_port_table(port);
+
+	return err < 0 ? err : 0;
+}
+
 static void nfp_port_get_pauseparam(struct net_device *netdev,
 				    struct ethtool_pauseparam *pause)
 {
@@ -2246,10 +2270,10 @@ static void nfp_port_get_pauseparam(struct net_device *netdev,
 	if (!eth_port)
 		return;
 
-	/* Currently pause frame support is fixed */
+	/* Currently pause frame autoneg is fixed */
 	pause->autoneg = AUTONEG_DISABLE;
-	pause->rx_pause = 1;
-	pause->tx_pause = 1;
+	pause->rx_pause = eth_port->rx_pause;
+	pause->tx_pause = eth_port->tx_pause;
 }
 
 static int nfp_net_set_phys_id(struct net_device *netdev,
@@ -2475,6 +2499,7 @@ static const struct ethtool_ops nfp_net_ethtool_ops = {
 	.set_link_ksettings	= nfp_net_set_link_ksettings,
 	.get_fecparam		= nfp_port_get_fecparam,
 	.set_fecparam		= nfp_port_set_fecparam,
+	.set_pauseparam		= nfp_port_set_pauseparam,
 	.get_pauseparam		= nfp_port_get_pauseparam,
 	.set_phys_id		= nfp_net_set_phys_id,
 };
@@ -2499,6 +2524,7 @@ const struct ethtool_ops nfp_port_ethtool_ops = {
 	.set_link_ksettings	= nfp_net_set_link_ksettings,
 	.get_fecparam		= nfp_port_get_fecparam,
 	.set_fecparam		= nfp_port_set_fecparam,
+	.set_pauseparam		= nfp_port_set_pauseparam,
 	.get_pauseparam		= nfp_port_get_pauseparam,
 	.set_phys_id		= nfp_net_set_phys_id,
 };

drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h

@@ -189,6 +189,8 @@ enum nfp_ethtool_link_mode_list {
  * @ports.enabled:	is enabled?
  * @ports.tx_enabled:	is TX enabled?
  * @ports.rx_enabled:	is RX enabled?
+ * @ports.rx_pause:	Switch of RX pause frame
+ * @ports.tx_pause:	Switch of Tx pause frame
  * @ports.override_changed: is media reconfig pending?
  *
  * @ports.port_type:	one of %PORT_* defines for ethtool
@@ -227,6 +229,8 @@ struct nfp_eth_table {
 		bool tx_enabled;
 		bool rx_enabled;
 		bool supp_aneg;
+		bool rx_pause;
+		bool tx_pause;
 
 		bool override_changed;
 
@@ -255,6 +259,8 @@ int
 nfp_eth_set_fec(struct nfp_cpp *cpp, unsigned int idx, enum nfp_eth_fec mode);
 
 int nfp_eth_set_idmode(struct nfp_cpp *cpp, unsigned int idx, bool state);
+int nfp_eth_set_pauseparam(struct nfp_cpp *cpp, unsigned int idx,
+			   unsigned int tx_pause, unsigned int rx_pause);
 
 static inline bool nfp_eth_can_support_fec(struct nfp_eth_table_port *eth_port)
 {

drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp_eth.c

@@ -42,6 +42,8 @@
 #define NSP_ETH_STATE_ANEG		GENMASK_ULL(25, 23)
 #define NSP_ETH_STATE_FEC		GENMASK_ULL(27, 26)
 #define NSP_ETH_STATE_ACT_FEC		GENMASK_ULL(29, 28)
+#define NSP_ETH_STATE_TX_PAUSE		BIT_ULL(31)
+#define NSP_ETH_STATE_RX_PAUSE		BIT_ULL(32)
 
 #define NSP_ETH_CTRL_CONFIGURED		BIT_ULL(0)
 #define NSP_ETH_CTRL_ENABLED		BIT_ULL(1)
@@ -52,6 +54,8 @@
 #define NSP_ETH_CTRL_SET_ANEG		BIT_ULL(6)
 #define NSP_ETH_CTRL_SET_FEC		BIT_ULL(7)
 #define NSP_ETH_CTRL_SET_IDMODE		BIT_ULL(8)
+#define NSP_ETH_CTRL_SET_TX_PAUSE	BIT_ULL(10)
+#define NSP_ETH_CTRL_SET_RX_PAUSE	BIT_ULL(11)
 
 enum nfp_eth_raw {
 	NSP_ETH_RAW_PORT = 0,
@@ -180,6 +184,15 @@ nfp_eth_port_translate(struct nfp_nsp *nsp, const union eth_table_entry *src,
 
 	dst->act_fec = FIELD_GET(NSP_ETH_STATE_ACT_FEC, state);
 	dst->supp_aneg = FIELD_GET(NSP_ETH_PORT_SUPP_ANEG, port);
+
+	if (nfp_nsp_get_abi_ver_minor(nsp) < 37) {
+		dst->tx_pause = true;
+		dst->rx_pause = true;
+		return;
+	}
+
+	dst->tx_pause = FIELD_GET(NSP_ETH_STATE_TX_PAUSE, state);
+	dst->rx_pause = FIELD_GET(NSP_ETH_STATE_RX_PAUSE, state);
 }
 
 static void
@@ -497,7 +510,7 @@ int nfp_eth_set_configured(struct nfp_cpp *cpp, unsigned int idx, bool configed)
 static int
 nfp_eth_set_bit_config(struct nfp_nsp *nsp, unsigned int raw_idx,
 		       const u64 mask, const unsigned int shift,
-		       unsigned int val, const u64 ctrl_bit)
+		       u64 val, const u64 ctrl_bit)
 {
 	union eth_table_entry *entries = nfp_nsp_config_entries(nsp);
 	unsigned int idx = nfp_nsp_config_idx(nsp);
@@ -629,6 +642,81 @@ nfp_eth_set_fec(struct nfp_cpp *cpp, unsigned int idx, enum nfp_eth_fec mode)
 	return nfp_eth_config_commit_end(nsp);
 }
 
+/**
+ * __nfp_eth_set_txpause() - set tx pause control bit
+ * @nsp:	NFP NSP handle returned from nfp_eth_config_start()
+ * @tx_pause:	TX pause switch
+ *
+ * Set TX pause switch.
+ *
+ * Return: 0 or -ERRNO.
+ */
+static int __nfp_eth_set_txpause(struct nfp_nsp *nsp, unsigned int tx_pause)
+{
+	return NFP_ETH_SET_BIT_CONFIG(nsp, NSP_ETH_RAW_STATE, NSP_ETH_STATE_TX_PAUSE,
+				      tx_pause, NSP_ETH_CTRL_SET_TX_PAUSE);
+}
+
+/**
+ * __nfp_eth_set_rxpause() - set rx pause control bit
+ * @nsp:	NFP NSP handle returned from nfp_eth_config_start()
+ * @rx_pause:	RX pause switch
+ *
+ * Set RX pause switch.
+ *
+ * Return: 0 or -ERRNO.
+ */
+static int __nfp_eth_set_rxpause(struct nfp_nsp *nsp, unsigned int rx_pause)
+{
+	return NFP_ETH_SET_BIT_CONFIG(nsp, NSP_ETH_RAW_STATE, NSP_ETH_STATE_RX_PAUSE,
+				      rx_pause, NSP_ETH_CTRL_SET_RX_PAUSE);
+}
+
+/**
+ * nfp_eth_set_pauseparam() - Set TX/RX pause switch.
+ * @cpp:	NFP CPP handle
+ * @idx:	NFP chip-wide port index
+ * @tx_pause:	TX pause switch
+ * @rx_pause:	RX pause switch
+ *
+ * Return:
+ * 0 - configuration successful;
+ * 1 - no changes were needed;
+ * -ERRNO - configuration failed.
+ */
+int
+nfp_eth_set_pauseparam(struct nfp_cpp *cpp, unsigned int idx,
+		       unsigned int tx_pause, unsigned int rx_pause)
+{
+	struct nfp_nsp *nsp;
+	int err;
+
+	nsp = nfp_eth_config_start(cpp, idx);
+	if (IS_ERR(nsp))
+		return PTR_ERR(nsp);
+
+	if (nfp_nsp_get_abi_ver_minor(nsp) < 37) {
+		nfp_err(nfp_nsp_cpp(nsp),
+			"set pause parameter operation not supported, please update flash\n");
+		nfp_eth_config_cleanup_end(nsp);
+		return -EOPNOTSUPP;
+	}
+
+	err = __nfp_eth_set_txpause(nsp, tx_pause);
+	if (err) {
+		nfp_eth_config_cleanup_end(nsp);
+		return err;
+	}
+
+	err = __nfp_eth_set_rxpause(nsp, rx_pause);
+	if (err) {
+		nfp_eth_config_cleanup_end(nsp);
+		return err;
+	}
+
+	return nfp_eth_config_commit_end(nsp);
+}
+
 /**
  * __nfp_eth_set_speed() - set interface speed/rate
  * @nsp:	NFP NSP handle returned from nfp_eth_config_start()