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From: Roger Quadros <rogerq@kernel.org>
Date: Thu, 06 Jun 2024 15:09:21 +0300
Subject: [PATCH RFC net-next 5/7] net: ethernet: ti: cpsw_ale: add
 policer/classifier helpers
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Message-Id: <20240606-am65-cpsw-multi-rx-v1-5-0704b0cb6fdc@kernel.org>
References: <20240606-am65-cpsw-multi-rx-v1-0-0704b0cb6fdc@kernel.org>
In-Reply-To: <20240606-am65-cpsw-multi-rx-v1-0-0704b0cb6fdc@kernel.org>
To: "David S. Miller" <davem@davemloft.net>, 
 Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, 
 Paolo Abeni <pabeni@redhat.com>, Siddharth Vadapalli <s-vadapalli@ti.com>
Cc: Andrew Lunn <andrew@lunn.ch>, srk@ti.com, vigneshr@ti.com, 
 danishanwar@ti.com, pekka Varis <p-varis@ti.com>, netdev@vger.kernel.org, 
 linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, 
 Roger Quadros <rogerq@kernel.org>

The Policer registers in the ALE register space are just shadow registers
and use an index field in the policer table control register to read/write
to the actual Polier registers.
Add helper functions to Read and Write to Policer registers.

Also add a helper function to set the thread value to classifier/policer
mapping. Any packet that first matches the classifier will be sent to the
thread (flow) that is set in the classifer to thread mapping table.
If not set then it goes to the default flow.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
---
 drivers/net/ethernet/ti/cpsw_ale.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/net/ethernet/ti/cpsw_ale.c b/drivers/net/ethernet/ti/cpsw_ale.c
index cbcc6573d7f3..9f0a3b960f74 100644
--- a/drivers/net/ethernet/ti/cpsw_ale.c
+++ b/drivers/net/ethernet/ti/cpsw_ale.c
@@ -1626,3 +1626,27 @@ u32 cpsw_ale_get_num_entries(struct cpsw_ale *ale)
 {
 	return ale ? ale->params.ale_entries : 0;
 }
+
+/* Reads the specified policer index into ALE POLICER registers */
+static void cpsw_ale_policer_read_idx(struct cpsw_ale *ale, u32 idx)
+{
+	idx &= ALE_POLICER_TBL_INDEX_MASK;
+	writel_relaxed(idx, ale->params.ale_regs + ALE_POLICER_TBL_CTL);
+}
+
+/* Writes the ALE POLICER registers into the specified policer index */
+static void cpsw_ale_policer_write_idx(struct cpsw_ale *ale, u32 idx)
+{
+	idx &= ALE_POLICER_TBL_INDEX_MASK;
+	idx |= ALE_POLICER_TBL_WRITE_ENABLE;
+	writel_relaxed(idx, ale->params.ale_regs + ALE_POLICER_TBL_CTL);
+}
+
+/* enables/disables the custom thread value for the specified policer index */
+static void cpsw_ale_policer_thread_idx_enable(struct cpsw_ale *ale, u32 idx,
+					       u32 thread_id, bool enable)
+{
+	regmap_field_write(ale->fields[ALE_THREAD_CLASS_INDEX], idx);
+	regmap_field_write(ale->fields[ALE_THREAD_VALUE], thread_id);
+	regmap_field_write(ale->fields[ALE_THREAD_ENABLE], enable ? 1 : 0);
+}

-- 
2.34.1