octeontx2-af: cn10k: Add RPM LMAC pause frame support

Flow control configuration is different for CGX(Octeontx2)
and RPM(CN10K) functional blocks. This patch adds the necessary
changes for RPM to support 802.3 pause frames configuration on
cn10k platforms.
Signed-off-by: Rakesh Babu <rsaladi2@marvell.com>
Signed-off-by: Geetha sowjanya <gakula@marvell.com>
Signed-off-by: Sunil Kovvuri Goutham <Sunil.Goutham@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -307,9 +307,6 @@ void cgx_lmac_enadis_rx_pause_fwding(void *cgxd, int lmac_id, bool enable)
 	struct cgx *cgx = cgxd;
 	u64 cfg;
 
-	if (is_dev_rpm(cgx))
-		return;
-
 	if (!cgx)
 		return;
 
@@ -452,8 +449,8 @@ int cgx_lmac_tx_enable(void *cgxd, int lmac_id, bool enable)
 	return !!(last & DATA_PKT_TX_EN);
 }
 
-int cgx_lmac_get_pause_frm(void *cgxd, int lmac_id,
-			   u8 *tx_pause, u8 *rx_pause)
+static int cgx_lmac_get_pause_frm_status(void *cgxd, int lmac_id,
+					 u8 *tx_pause, u8 *rx_pause)
 {
 	struct cgx *cgx = cgxd;
 	u64 cfg;
@@ -472,8 +469,8 @@ int cgx_lmac_get_pause_frm(void *cgxd, int lmac_id,
 	return 0;
 }
 
-int cgx_lmac_set_pause_frm(void *cgxd, int lmac_id,
-			   u8 tx_pause, u8 rx_pause)
+static int cgx_lmac_enadis_pause_frm(void *cgxd, int lmac_id,
+				     u8 tx_pause, u8 rx_pause)
 {
 	struct cgx *cgx = cgxd;
 	u64 cfg;
@@ -505,13 +502,11 @@ int cgx_lmac_set_pause_frm(void *cgxd, int lmac_id,
 	return 0;
 }
 
-static void cgx_lmac_pause_frm_config(struct cgx *cgx, int lmac_id, bool enable)
+static void cgx_lmac_pause_frm_config(void *cgxd, int lmac_id, bool enable)
 {
+	struct cgx *cgx = cgxd;
 	u64 cfg;
 
-	if (is_dev_rpm(cgx))
-		return;
-
 	if (!is_lmac_valid(cgx, lmac_id))
 		return;
 	if (enable) {
@@ -1252,7 +1247,7 @@ static int cgx_lmac_init(struct cgx *cgx)
 
 		/* Add reference */
 		cgx->lmac_idmap[lmac->lmac_id] = lmac;
-		cgx_lmac_pause_frm_config(cgx, lmac->lmac_id, true);
+		cgx->mac_ops->mac_pause_frm_config(cgx, lmac->lmac_id, true);
 		set_bit(lmac->lmac_id, &cgx->lmac_bmap);
 	}
 
@@ -1281,7 +1276,7 @@ static int cgx_lmac_exit(struct cgx *cgx)
 		lmac = cgx->lmac_idmap[i];
 		if (!lmac)
 			continue;
-		cgx_lmac_pause_frm_config(cgx, lmac->lmac_id, false);
+		cgx->mac_ops->mac_pause_frm_config(cgx, lmac->lmac_id, false);
 		cgx_configure_interrupt(cgx, lmac, lmac->lmac_id, true);
 		kfree(lmac->name);
 		kfree(lmac);
@@ -1293,7 +1288,7 @@ static int cgx_lmac_exit(struct cgx *cgx)
 static void cgx_populate_features(struct cgx *cgx)
 {
 	if (is_dev_rpm(cgx))
-		cgx->hw_features =  RVU_MAC_RPM;
+		cgx->hw_features =  (RVU_MAC_RPM | RVU_LMAC_FEAT_FC);
 	else
 		cgx->hw_features = (RVU_LMAC_FEAT_FC | RVU_LMAC_FEAT_PTP);
 }
@@ -1309,6 +1304,10 @@ static struct mac_ops	cgx_mac_ops    = {
 	.lmac_fwi	=	CGX_LMAC_FWI,
 	.non_contiguous_serdes_lane = false,
 	.get_nr_lmacs	=	cgx_get_nr_lmacs,
+	.mac_enadis_rx_pause_fwding =	cgx_lmac_enadis_rx_pause_fwding,
+	.mac_get_pause_frm_status =	cgx_lmac_get_pause_frm_status,
+	.mac_enadis_pause_frm =		cgx_lmac_enadis_pause_frm,
+	.mac_pause_frm_config =		cgx_lmac_pause_frm_config,
 };
 
 static int cgx_probe(struct pci_dev *pdev, const struct pci_device_id *id)

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

@@ -67,6 +67,24 @@ struct mac_ops {
 	 * number of setbits in lmac_exist tells number of lmacs
 	 */
 	int			(*get_nr_lmacs)(void *cgx);
+
+	/* Enable LMAC Pause Frame Configuration */
+	void			(*mac_enadis_rx_pause_fwding)(void *cgxd,
+							      int lmac_id,
+							      bool enable);
+	int			(*mac_get_pause_frm_status)(void *cgxd,
+							    int lmac_id,
+							    u8 *tx_pause,
+							    u8 *rx_pause);
+
+	int			(*mac_enadis_pause_frm)(void *cgxd,
+							int lmac_id,
+							u8 tx_pause,
+							u8 rx_pause);
+	void			(*mac_pause_frm_config)(void  *cgxd,
+							int lmac_id,
+							bool enable);
+
 };
 
 struct cgx {

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

@@ -19,6 +19,10 @@ static struct mac_ops	rpm_mac_ops   = {
 	.lmac_fwi	=	RPM_LMAC_FWI,
 	.non_contiguous_serdes_lane = true,
 	.get_nr_lmacs	=	rpm_get_nr_lmacs,
+	.mac_enadis_rx_pause_fwding =	rpm_lmac_enadis_rx_pause_fwding,
+	.mac_get_pause_frm_status =	rpm_lmac_get_pause_frm_status,
+	.mac_enadis_pause_frm =		rpm_lmac_enadis_pause_frm,
+	.mac_pause_frm_config =		rpm_lmac_pause_frm_config,
 };
 
 struct mac_ops *rpm_get_mac_ops(void)
@@ -26,6 +30,11 @@ struct mac_ops *rpm_get_mac_ops(void)
 	return &rpm_mac_ops;
 }
 
+static void rpm_write(rpm_t *rpm, u64 lmac, u64 offset, u64 val)
+{
+	cgx_write(rpm, lmac, offset, val);
+}
+
 static u64 rpm_read(rpm_t *rpm, u64 lmac, u64 offset)
 {
 	return	cgx_read(rpm, lmac, offset);
@@ -37,3 +46,128 @@ int rpm_get_nr_lmacs(void *rpmd)
 
 	return hweight8(rpm_read(rpm, 0, CGXX_CMRX_RX_LMACS) & 0xFULL);
 }
+
+void rpm_lmac_enadis_rx_pause_fwding(void *rpmd, int lmac_id, bool enable)
+{
+	struct cgx *rpm = rpmd;
+	u64 cfg;
+
+	if (!rpm)
+		return;
+
+	if (enable) {
+		cfg = rpm_read(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG);
+		cfg &= ~RPMX_MTI_MAC100X_COMMAND_CONFIG_PAUSE_IGNORE;
+		rpm_write(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG, cfg);
+	} else {
+		cfg = rpm_read(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG);
+		cfg |= RPMX_MTI_MAC100X_COMMAND_CONFIG_PAUSE_IGNORE;
+		rpm_write(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG, cfg);
+	}
+}
+
+int rpm_lmac_get_pause_frm_status(void *rpmd, int lmac_id,
+				  u8 *tx_pause, u8 *rx_pause)
+{
+	rpm_t *rpm = rpmd;
+	u64 cfg;
+
+	if (!is_lmac_valid(rpm, lmac_id))
+		return -ENODEV;
+
+	cfg = rpm_read(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG);
+	*rx_pause = !(cfg & RPMX_MTI_MAC100X_COMMAND_CONFIG_RX_P_DISABLE);
+
+	cfg = rpm_read(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG);
+	*tx_pause = !(cfg & RPMX_MTI_MAC100X_COMMAND_CONFIG_TX_P_DISABLE);
+	return 0;
+}
+
+int rpm_lmac_enadis_pause_frm(void *rpmd, int lmac_id, u8 tx_pause,
+			      u8 rx_pause)
+{
+	rpm_t *rpm = rpmd;
+	u64 cfg;
+
+	if (!is_lmac_valid(rpm, lmac_id))
+		return -ENODEV;
+
+	cfg = rpm_read(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG);
+	cfg &= ~RPMX_MTI_MAC100X_COMMAND_CONFIG_RX_P_DISABLE;
+	cfg |= rx_pause ? 0x0 : RPMX_MTI_MAC100X_COMMAND_CONFIG_RX_P_DISABLE;
+	cfg &= ~RPMX_MTI_MAC100X_COMMAND_CONFIG_PAUSE_IGNORE;
+	cfg |= rx_pause ? 0x0 : RPMX_MTI_MAC100X_COMMAND_CONFIG_PAUSE_IGNORE;
+	rpm_write(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG, cfg);
+
+	cfg = rpm_read(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG);
+	cfg &= ~RPMX_MTI_MAC100X_COMMAND_CONFIG_TX_P_DISABLE;
+	cfg |= tx_pause ? 0x0 : RPMX_MTI_MAC100X_COMMAND_CONFIG_TX_P_DISABLE;
+	rpm_write(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG, cfg);
+
+	cfg = rpm_read(rpm, 0, RPMX_CMR_RX_OVR_BP);
+	if (tx_pause) {
+		cfg &= ~RPMX_CMR_RX_OVR_BP_EN(lmac_id);
+	} else {
+		cfg |= RPMX_CMR_RX_OVR_BP_EN(lmac_id);
+		cfg &= ~RPMX_CMR_RX_OVR_BP_BP(lmac_id);
+	}
+	rpm_write(rpm, 0, RPMX_CMR_RX_OVR_BP, cfg);
+	return 0;
+}
+
+void rpm_lmac_pause_frm_config(void *rpmd, int lmac_id, bool enable)
+{
+	rpm_t *rpm = rpmd;
+	u64 cfg;
+
+	if (enable) {
+		/* Enable 802.3 pause frame mode */
+		cfg = rpm_read(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG);
+		cfg &= ~RPMX_MTI_MAC100X_COMMAND_CONFIG_PFC_MODE;
+		rpm_write(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG, cfg);
+
+		/* Enable receive pause frames */
+		cfg = rpm_read(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG);
+		cfg &= ~RPMX_MTI_MAC100X_COMMAND_CONFIG_RX_P_DISABLE;
+		rpm_write(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG, cfg);
+
+		/* Enable forward pause to TX block */
+		cfg = rpm_read(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG);
+		cfg &= ~RPMX_MTI_MAC100X_COMMAND_CONFIG_PAUSE_IGNORE;
+		rpm_write(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG, cfg);
+
+		/* Enable pause frames transmission */
+		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);
+
+		/* Set pause time and interval */
+		cfg = rpm_read(rpm, lmac_id,
+			       RPMX_MTI_MAC100X_CL01_PAUSE_QUANTA);
+		cfg &= ~0xFFFFULL;
+		rpm_write(rpm, lmac_id, RPMX_MTI_MAC100X_CL01_PAUSE_QUANTA,
+			  cfg | RPM_DEFAULT_PAUSE_TIME);
+		/* Set pause interval as the hardware default is too short */
+		cfg = rpm_read(rpm, lmac_id,
+			       RPMX_MTI_MAC100X_CL01_QUANTA_THRESH);
+		cfg &= ~0xFFFFULL;
+		rpm_write(rpm, lmac_id, RPMX_MTI_MAC100X_CL01_QUANTA_THRESH,
+			  cfg | (RPM_DEFAULT_PAUSE_TIME / 2));
+
+	} else {
+		/* ALL pause frames received are completely ignored */
+		cfg = rpm_read(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG);
+		cfg |= RPMX_MTI_MAC100X_COMMAND_CONFIG_RX_P_DISABLE;
+		rpm_write(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG, cfg);
+
+		/* Disable forward pause to TX block */
+		cfg = rpm_read(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG);
+		cfg |= RPMX_MTI_MAC100X_COMMAND_CONFIG_PAUSE_IGNORE;
+		rpm_write(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG, cfg);
+
+		/* Disable pause frames transmission */
+		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);
+	}
+}

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

@@ -21,9 +21,25 @@
 
 #define RPMX_CMRX_LINK_RANGE_MASK	GENMASK_ULL(19, 16)
 #define RPMX_CMRX_LINK_BASE_MASK	GENMASK_ULL(11, 0)
-
+#define RPMX_MTI_MAC100X_COMMAND_CONFIG	0x8010
+#define RPMX_MTI_MAC100X_COMMAND_CONFIG_RX_P_DISABLE	BIT_ULL(29)
+#define RPMX_MTI_MAC100X_COMMAND_CONFIG_TX_P_DISABLE	BIT_ULL(28)
+#define RPMX_MTI_MAC100X_COMMAND_CONFIG_PAUSE_IGNORE	BIT_ULL(8)
+#define RPMX_MTI_MAC100X_COMMAND_CONFIG_PFC_MODE	BIT_ULL(19)
+#define RPMX_MTI_MAC100X_CL01_PAUSE_QUANTA		0x80A8
+#define RPMX_MTI_MAC100X_CL01_QUANTA_THRESH		0x80C8
+#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)
 #define RPM_LMAC_FWI			0xa
 
 /* Function Declarations */
+void rpm_lmac_enadis_rx_pause_fwding(void *rpmd, int lmac_id, bool enable);
+int rpm_lmac_get_pause_frm_status(void *cgxd, int lmac_id, u8 *tx_pause,
+				  u8 *rx_pause);
+void rpm_lmac_pause_frm_config(void *rpmd, int lmac_id, bool enable);
+int rpm_lmac_enadis_pause_frm(void *rpmd, int lmac_id, u8 tx_pause,
+			      u8 rx_pause);
 int rpm_get_nr_lmacs(void *cgxd);
 #endif /* RPM_H */

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

@@ -406,6 +406,7 @@ static bool is_cgx_config_permitted(struct rvu *rvu, u16 pcifunc)
 
 void rvu_cgx_enadis_rx_bp(struct rvu *rvu, int pf, bool enable)
 {
+	struct mac_ops *mac_ops;
 	u8 cgx_id, lmac_id;
 	void *cgxd;
 
@@ -415,11 +416,12 @@ void rvu_cgx_enadis_rx_bp(struct rvu *rvu, int pf, bool enable)
 	rvu_get_cgx_lmac_id(rvu->pf2cgxlmac_map[pf], &cgx_id, &lmac_id);
 	cgxd = rvu_cgx_pdata(cgx_id, rvu);
 
+	mac_ops = get_mac_ops(cgxd);
 	/* Set / clear CTL_BCK to control pause frame forwarding to NIX */
 	if (enable)
-		cgx_lmac_enadis_rx_pause_fwding(cgxd, lmac_id, true);
+		mac_ops->mac_enadis_rx_pause_fwding(cgxd, lmac_id, true);
 	else
-		cgx_lmac_enadis_rx_pause_fwding(cgxd, lmac_id, false);
+		mac_ops->mac_enadis_rx_pause_fwding(cgxd, lmac_id, false);
 }
 
 int rvu_cgx_config_rxtx(struct rvu *rvu, u16 pcifunc, bool start)
@@ -731,7 +733,9 @@ int rvu_mbox_handler_cgx_cfg_pause_frm(struct rvu *rvu,
 				       struct cgx_pause_frm_cfg *rsp)
 {
 	int pf = rvu_get_pf(req->hdr.pcifunc);
+	struct mac_ops *mac_ops;
 	u8 cgx_id, lmac_id;
+	void *cgxd;
 
 	if (!is_mac_feature_supported(rvu, pf, RVU_LMAC_FEAT_FC))
 		return 0;
@@ -743,13 +747,16 @@ int rvu_mbox_handler_cgx_cfg_pause_frm(struct rvu *rvu,
 		return -ENODEV;
 
 	rvu_get_cgx_lmac_id(rvu->pf2cgxlmac_map[pf], &cgx_id, &lmac_id);
+	cgxd = rvu_cgx_pdata(cgx_id, rvu);
+	mac_ops = get_mac_ops(cgxd);
 
 	if (req->set)
-		cgx_lmac_set_pause_frm(rvu_cgx_pdata(cgx_id, rvu), lmac_id,
-				       req->tx_pause, req->rx_pause);
+		mac_ops->mac_enadis_pause_frm(cgxd, lmac_id,
+					      req->tx_pause, req->rx_pause);
 	else
-		cgx_lmac_get_pause_frm(rvu_cgx_pdata(cgx_id, rvu), lmac_id,
-				       &rsp->tx_pause, &rsp->rx_pause);
+		mac_ops->mac_get_pause_frm_status(cgxd, lmac_id,
+						  &rsp->tx_pause,
+						  &rsp->rx_pause);
 	return 0;
 }
 

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

@@ -16,6 +16,7 @@
 #include "rvu.h"
 #include "npc.h"
 #include "cgx.h"
+#include "lmac_common.h"
 
 static void nix_free_tx_vtag_entries(struct rvu *rvu, u16 pcifunc);
 static int rvu_nix_get_bpid(struct rvu *rvu, struct nix_bp_cfg_req *req,
@@ -214,6 +215,7 @@ static bool is_valid_txschq(struct rvu *rvu, int blkaddr,
 static int nix_interface_init(struct rvu *rvu, u16 pcifunc, int type, int nixlf)
 {
 	struct rvu_pfvf *pfvf = rvu_get_pfvf(rvu, pcifunc);
+	struct mac_ops *mac_ops;
 	int pkind, pf, vf, lbkid;
 	u8 cgx_id, lmac_id;
 	int err;
@@ -240,10 +242,12 @@ static int nix_interface_init(struct rvu *rvu, u16 pcifunc, int type, int nixlf)
 		cgx_set_pkind(rvu_cgx_pdata(cgx_id, rvu), lmac_id, pkind);
 		rvu_npc_set_pkind(rvu, pkind, pfvf);
 
+		mac_ops = get_mac_ops(rvu_cgx_pdata(cgx_id, rvu));
 		/* By default we enable pause frames */
 		if ((pcifunc & RVU_PFVF_FUNC_MASK) == 0)
-			cgx_lmac_set_pause_frm(rvu_cgx_pdata(cgx_id, rvu),
-					       lmac_id, true, true);
+			mac_ops->mac_enadis_pause_frm(rvu_cgx_pdata(cgx_id,
+								    rvu),
+						      lmac_id, true, true);
 		break;
 	case NIX_INTF_TYPE_LBK:
 		vf = (pcifunc & RVU_PFVF_FUNC_MASK) - 1;