The PPE RSS hash is generated during PPE receive, based on the packet
content (3 tuples or 5 tuples) and as per the configured RSS seed. The
hash is then used to select the queue to transmit the packet to the
ARM CPU.

This patch initializes the RSS hash settings that are used to generate
the hash for the packet during PPE packet receive.

Signed-off-by: Luo Jie <redacted>
---
 drivers/net/ethernet/qualcomm/ppe/ppe_config.c | 194 ++++++++++++++++++++++++-
 drivers/net/ethernet/qualcomm/ppe/ppe_config.h |  39 +++++
 drivers/net/ethernet/qualcomm/ppe/ppe_regs.h   |  40 +++++
 3 files changed, 272 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qualcomm/ppe/ppe_config.c b/drivers/net/ethernet/qualcomm/ppe/ppe_config.c
index dd7a4949f049..3b290eda7633 100644
--- a/drivers/net/ethernet/qualcomm/ppe/ppe_config.c
+++ b/drivers/net/ethernet/qualcomm/ppe/ppe_config.c

@@ -1216,6 +1216,143 @@ int ppe_counter_enable_set(struct ppe_device *ppe_dev, int port)
 	return regmap_set_bits(ppe_dev->regmap, reg, PPE_PORT_EG_VLAN_TBL_TX_COUNTING_EN);
 }
 
+static int ppe_rss_hash_ipv4_config(struct ppe_device *ppe_dev, int index,
+				    struct ppe_rss_hash_cfg cfg)
+{
+	u32 reg, val;
+
+	switch (index) {
+	case 0:
+		val = FIELD_PREP(PPE_RSS_HASH_MIX_IPV4_VAL, cfg.hash_sip_mix[0]);
+		break;
+	case 1:
+		val = FIELD_PREP(PPE_RSS_HASH_MIX_IPV4_VAL, cfg.hash_dip_mix[0]);
+		break;
+	case 2:
+		val = FIELD_PREP(PPE_RSS_HASH_MIX_IPV4_VAL, cfg.hash_protocol_mix);
+		break;
+	case 3:
+		val = FIELD_PREP(PPE_RSS_HASH_MIX_IPV4_VAL, cfg.hash_dport_mix);
+		break;
+	case 4:
+		val = FIELD_PREP(PPE_RSS_HASH_MIX_IPV4_VAL, cfg.hash_sport_mix);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	reg = PPE_RSS_HASH_MIX_IPV4_ADDR + index * PPE_RSS_HASH_MIX_IPV4_INC;
+
+	return regmap_write(ppe_dev->regmap, reg, val);