octeontx2-af: Don't reset previous pfc config

Current implementation is such that driver first resets the
existing PFC config before applying new pfc configuration.
This creates a problem like once PF or VFs requests PFC config
previous pfc config by other PFVfs is getting reset.

This patch fixes the problem by removing unnecessary resetting
of PFC config. Also configure Pause quanta value to smaller as
current value is too high.
Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
Signed-off-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/octeontx2/af/cgx.c

@@ -847,6 +847,11 @@ static void cgx_lmac_pause_frm_config(void *cgxd, int lmac_id, bool enable)
 	cfg |= CGX_CMR_RX_OVR_BP_EN(lmac_id);
 	cfg &= ~CGX_CMR_RX_OVR_BP_BP(lmac_id);
 	cgx_write(cgx, 0, CGXX_CMR_RX_OVR_BP, cfg);
+
+	/* Disable all PFC classes by default */
+	cfg = cgx_read(cgx, lmac_id, CGXX_SMUX_CBFC_CTL);
+	cfg = FIELD_SET(CGX_PFC_CLASS_MASK, 0, cfg);
+	cgx_write(cgx, lmac_id, CGXX_SMUX_CBFC_CTL, cfg);
 }
 
 int verify_lmac_fc_cfg(void *cgxd, int lmac_id, u8 tx_pause, u8 rx_pause,
@@ -899,6 +904,7 @@ int cgx_lmac_pfc_config(void *cgxd, int lmac_id, u8 tx_pause,
 		return 0;
 
 	cfg = cgx_read(cgx, lmac_id, CGXX_SMUX_CBFC_CTL);
+	pfc_en |= FIELD_GET(CGX_PFC_CLASS_MASK, cfg);
 
 	if (rx_pause) {
 		cfg |= (CGXX_SMUX_CBFC_CTL_RX_EN |
@@ -910,12 +916,13 @@ int cgx_lmac_pfc_config(void *cgxd, int lmac_id, u8 tx_pause,
 			CGXX_SMUX_CBFC_CTL_DRP_EN);
 	}
 
-	if (tx_pause)
+	if (tx_pause) {
 		cfg |= CGXX_SMUX_CBFC_CTL_TX_EN;
-	else
-		cfg &= ~CGXX_SMUX_CBFC_CTL_TX_EN;
-
 		cfg = FIELD_SET(CGX_PFC_CLASS_MASK, pfc_en, cfg);
+	} else {
+		cfg &= ~CGXX_SMUX_CBFC_CTL_TX_EN;
+		cfg = FIELD_SET(CGX_PFC_CLASS_MASK, 0, cfg);
+	}
 
 	cgx_write(cgx, lmac_id, CGXX_SMUX_CBFC_CTL, cfg);
 

drivers/net/ethernet/marvell/octeontx2/af/rpm.c

@@ -276,6 +276,11 @@ void rpm_lmac_pause_frm_config(void *rpmd, int lmac_id, bool enable)
 	cfg = rpm_read(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG);
 	cfg |= RPMX_MTI_MAC100X_COMMAND_CONFIG_TX_P_DISABLE;
 	rpm_write(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG, cfg);
+
+	/* Disable all PFC classes */
+	cfg = rpm_read(rpm, lmac_id, RPMX_CMRX_PRT_CBFC_CTL);
+	cfg = FIELD_SET(RPM_PFC_CLASS_MASK, 0, cfg);
+	rpm_write(rpm, lmac_id, RPMX_CMRX_PRT_CBFC_CTL, cfg);
 }
 
 int rpm_get_rx_stats(void *rpmd, int lmac_id, int idx, u64 *rx_stat)
@@ -387,15 +392,14 @@ void rpm_lmac_ptp_config(void *rpmd, int lmac_id, bool enable)
 int rpm_lmac_pfc_config(void *rpmd, int lmac_id, u8 tx_pause, u8 rx_pause, u16 pfc_en)
 {
 	rpm_t *rpm = rpmd;
-	u64 cfg;
+	u64 cfg, class_en;
 
 	if (!is_lmac_valid(rpm, lmac_id))
 		return -ENODEV;
 
-	/* reset PFC class quanta and threshold */
-	rpm_cfg_pfc_quanta_thresh(rpm, lmac_id, 0xffff, false);
-
 	cfg = rpm_read(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG);
+	class_en = rpm_read(rpm, lmac_id, RPMX_CMRX_PRT_CBFC_CTL);
+	pfc_en |= FIELD_GET(RPM_PFC_CLASS_MASK, class_en);
 
 	if (rx_pause) {
 		cfg &= ~(RPMX_MTI_MAC100X_COMMAND_CONFIG_RX_P_DISABLE |
@@ -410,9 +414,11 @@ int rpm_lmac_pfc_config(void *rpmd, int lmac_id, u8 tx_pause, u8 rx_pause, u16 p
 	if (tx_pause) {
 		rpm_cfg_pfc_quanta_thresh(rpm, lmac_id, pfc_en, true);
 		cfg &= ~RPMX_MTI_MAC100X_COMMAND_CONFIG_TX_P_DISABLE;
+		class_en = FIELD_SET(RPM_PFC_CLASS_MASK, pfc_en, class_en);
 	} else {
 		rpm_cfg_pfc_quanta_thresh(rpm, lmac_id, 0xfff, false);
 		cfg |= RPMX_MTI_MAC100X_COMMAND_CONFIG_TX_P_DISABLE;
+		class_en = FIELD_SET(RPM_PFC_CLASS_MASK, 0, class_en);
 	}
 
 	if (!rx_pause && !tx_pause)
@@ -422,9 +428,7 @@ int rpm_lmac_pfc_config(void *rpmd, int lmac_id, u8 tx_pause, u8 rx_pause, u16 p
 
 	rpm_write(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG, cfg);
 
-	cfg = rpm_read(rpm, lmac_id, RPMX_CMRX_PRT_CBFC_CTL);
-	cfg = FIELD_SET(RPM_PFC_CLASS_MASK, pfc_en, cfg);
-	rpm_write(rpm, lmac_id, RPMX_CMRX_PRT_CBFC_CTL, cfg);
+	rpm_write(rpm, lmac_id, RPMX_CMRX_PRT_CBFC_CTL, class_en);
 
 	return 0;
 }

drivers/net/ethernet/marvell/octeontx2/af/rpm.h

@@ -48,7 +48,6 @@
 #define RPMX_MTI_MAC100X_CL1011_QUANTA_THRESH		0x8130
 #define RPMX_MTI_MAC100X_CL1213_QUANTA_THRESH		0x8138
 #define RPMX_MTI_MAC100X_CL1415_QUANTA_THRESH		0x8140
-#define RPM_DEFAULT_PAUSE_TIME			0xFFFF
 #define RPMX_CMR_RX_OVR_BP		0x4120
 #define RPMX_CMR_RX_OVR_BP_EN(x)	BIT_ULL((x) + 8)
 #define RPMX_CMR_RX_OVR_BP_BP(x)	BIT_ULL((x) + 4)
@@ -70,7 +69,7 @@
 #define RPMX_MTI_MAC100X_COMMAND_CONFIG_PAUSE_FWD              BIT_ULL(7)
 #define RPMX_MTI_MAC100X_CL01_PAUSE_QUANTA              0x80A8
 #define RPMX_MTI_MAC100X_CL89_PAUSE_QUANTA		0x8108
-#define RPM_DEFAULT_PAUSE_TIME                          0xFFFF
+#define RPM_DEFAULT_PAUSE_TIME                          0x7FF
 
 /* Function Declarations */
 int rpm_get_nr_lmacs(void *rpmd);