net: ti: icssg: Add support sending FDB command to update rx_flow_id

ICSSG firmware supports FDB commands. Add support to send FDB commands
from driver. Once rx_flow_id is obtained from dma, let firmware know that
we are using this rx_flow_id by sending a FDB command.

Reviewed-by: Ravi Gunasekaran <r-gunasekaran@ti.com>
Signed-off-by: MD Danish Anwar <danishanwar@ti.com>

drivers/net/ti/icssg_config.c

@@ -9,6 +9,7 @@
 #include "icssg_switch_map.h"
 #include "icss_mii_rt.h"
 #include <dm/device_compat.h>
+#include <linux/iopoll.h>
 
 /* TX IPG Values to be set for 100M and 1G link speeds.  These values are
  * in ocp_clk cycles. So need change if ocp_clk is changed for a specific
@@ -404,3 +405,70 @@ int emac_set_port_state(struct prueth_priv *priv,
 
 	return ret;
 }
+
+int icssg_send_fdb_msg(struct prueth_priv *priv, struct mgmt_cmd *cmd,
+		       struct mgmt_cmd_rsp *rsp)
+{
+	struct prueth *prueth = priv->prueth;
+	int slice = priv->port_id;
+	int ret, addr;
+
+	addr = icssg_queue_pop(prueth, slice == 0 ?
+			       ICSSG_CMD_POP_SLICE0 : ICSSG_CMD_POP_SLICE1);
+	if (addr < 0)
+		return addr;
+
+	/* First 4 bytes have FW owned buffer linking info which should
+	 * not be touched
+	 */
+	memcpy_toio((void __iomem *)prueth->shram.pa + addr + 4, cmd, sizeof(*cmd));
+	icssg_queue_push(prueth, slice == 0 ?
+			 ICSSG_CMD_PUSH_SLICE0 : ICSSG_CMD_PUSH_SLICE1, addr);
+	ret = read_poll_timeout(icssg_queue_pop, addr, addr >= 0,
+				2000, 20000000, prueth, slice == 0 ?
+				ICSSG_RSP_POP_SLICE0 : ICSSG_RSP_POP_SLICE1);
+
+	if (ret) {
+		dev_err(prueth->dev, "Timedout sending HWQ message\n");
+		return ret;
+	}
+
+	memcpy_fromio(rsp, (void __iomem *)prueth->shram.pa + addr, sizeof(*rsp));
+	/* Return buffer back for to pool */
+	icssg_queue_push(prueth, slice == 0 ?
+			 ICSSG_RSP_PUSH_SLICE0 : ICSSG_RSP_PUSH_SLICE1, addr);
+
+	return 0;
+}
+
+int emac_fdb_flow_id_updated(struct prueth_priv *priv)
+{
+	struct mgmt_cmd_rsp fdb_cmd_rsp = { 0 };
+	struct prueth *prueth = priv->prueth;
+	struct mgmt_cmd fdb_cmd = { 0 };
+	int slice = priv->port_id;
+	int ret = 0;
+
+	fdb_cmd.header = ICSSG_FW_MGMT_CMD_HEADER;
+	fdb_cmd.type   = ICSSG_FW_MGMT_FDB_CMD_TYPE_RX_FLOW;
+	fdb_cmd.seqnum = ++(prueth->icssg_hwcmdseq);
+	fdb_cmd.param  = 0;
+
+	fdb_cmd.param |= (slice << 4);
+	fdb_cmd.cmd_args[0] = 0;
+
+	ret = icssg_send_fdb_msg(priv, &fdb_cmd, &fdb_cmd_rsp);
+	if (ret)
+		return ret;
+
+	if (fdb_cmd.seqnum != fdb_cmd_rsp.seqnum) {
+		dev_err(prueth->dev, "seqnum doesn't match, cmd.seqnum %d != rsp.seqnum %d\n",
+			fdb_cmd.seqnum, fdb_cmd_rsp.seqnum);
+		return -EINVAL;
+	}
+
+	if (fdb_cmd_rsp.status == 1)
+		return 0;
+
+	return -EINVAL;
+}

drivers/net/ti/icssg_config.h

@@ -80,6 +80,7 @@ struct icssg_rxq_ctx {
 #define ICSSG_FW_MGMT_FDB_CMD_TYPE	0x03
 #define ICSSG_FW_MGMT_CMD_TYPE		0x04
 #define ICSSG_FW_MGMT_PKT		0x80000000
+#define ICSSG_FW_MGMT_FDB_CMD_TYPE_RX_FLOW	0x05
 
 struct icssg_r30_cmd {
 	u32 cmd[4];
@@ -156,6 +157,23 @@ struct icssg_setclock_desc {
 	u32 CMP0_new;
 } __packed;
 
+struct mgmt_cmd {
+	u8 param;
+	u8 seqnum;
+	u8 type;
+	u8 header;
+	u32 cmd_args[3];
+} __packed;
+
+struct mgmt_cmd_rsp {
+	u32 reserved;
+	u8 status;
+	u8 seqnum;
+	u8 type;
+	u8 header;
+	u32 cmd_args[3];
+} __packed;
+
 #define ICSSG_CMD_POP_SLICE0	56
 #define ICSSG_CMD_POP_SLICE1	60
 

drivers/net/ti/icssg_prueth.c

@@ -374,6 +374,12 @@ static int prueth_start(struct udevice *dev)
 	dev_info(dev, "K3 ICSSG: rflow_id_base: %u, chn_name = %s\n",
 		 dma_rx_cfg_data->flow_id_base, chn_name);
 
+	ret = emac_fdb_flow_id_updated(priv);
+	if (ret) {
+		dev_err(dev, "Failed to update Rx Flow ID %d", ret);
+		goto phy_fail;
+	}
+
 	ret = phy_startup(priv->phydev);
 	if (ret) {
 		dev_err(dev, "phy_startup failed\n");

drivers/net/ti/icssg_prueth.h

@@ -65,6 +65,7 @@ struct prueth {
 	u8			pru_core_id;
 	u8			rtu_core_id;
 	u8			txpru_core_id;
+	u8			icssg_hwcmdseq;
 };
 
 struct prueth_priv {
@@ -88,4 +89,9 @@ int icssg_queue_pop(struct prueth *prueth, u8 queue);
 void icssg_queue_push(struct prueth *prueth, int queue, u16 addr);
 u32 icssg_queue_level(struct prueth *prueth, int queue);
 
+/* FDB helpers */
+int icssg_send_fdb_msg(struct prueth_priv *priv, struct mgmt_cmd *cmd,
+		       struct mgmt_cmd_rsp *rsp);
+int emac_fdb_flow_id_updated(struct prueth_priv *priv);
+
 #endif /* __NET_TI_ICSSG_PRUETH_H */