netdev - [PATCH net-next 01/12] mlxsw: reg: Add Policy Engine Algorithmic Bloom Filter Entries Register

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Date:   Sun, 16 Dec 2018 08:49:24 +0000
From:   Ido Schimmel <idosch@...lanox.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>, Nir Dotan <nird@...lanox.com>,
        mlxsw <mlxsw@...lanox.com>, Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next 01/12] mlxsw: reg: Add Policy Engine Algorithmic
 Bloom Filter Entries Register

From: Nir Dotan <nird@...lanox.com>

Bloom filter is a bit vector which allows the HW a fast lookup on a
small size bit vector, that may reduce the number of lookups on the
A-TCAM memory. PEABFE register allows setting values to the bits of
the bit vector mentioned above.
Add the register to be later used in A-TCAM optimizations.

Signed-off-by: Nir Dotan <nird@...lanox.com>
Signed-off-by: Ido Schimmel <idosch@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/reg.h | 67 +++++++++++++++++++++++
 1 file changed, 67 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/reg.h b/drivers/net/ethernet/mellanox/mlxsw/reg.h
index ace3a897b3f0..8e1f7ae4342a 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/reg.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/reg.h
@@ -3095,6 +3095,72 @@ static inline void mlxsw_reg_pererp_pack(char *payload, u16 region_id,
 	mlxsw_reg_pererp_master_rp_id_set(payload, master_rp_id);
 }
 
+/* PEABFE - Policy-Engine Algorithmic Bloom Filter Entries Register
+ * ----------------------------------------------------------------
+ * This register configures the Bloom filter entries.
+ */
+#define MLXSW_REG_PEABFE_ID 0x3022
+#define MLXSW_REG_PEABFE_BASE_LEN 0x10
+#define MLXSW_REG_PEABFE_BF_REC_LEN 0x4
+#define MLXSW_REG_PEABFE_BF_REC_MAX_COUNT 256
+#define MLXSW_REG_PEABFE_LEN (MLXSW_REG_PEABFE_BASE_LEN + \
+			      MLXSW_REG_PEABFE_BF_REC_LEN * \
+			      MLXSW_REG_PEABFE_BF_REC_MAX_COUNT)
+
+MLXSW_REG_DEFINE(peabfe, MLXSW_REG_PEABFE_ID, MLXSW_REG_PEABFE_LEN);
+
+/* reg_peabfe_size
+ * Number of BF entries to be updated.
+ * Range 1..256
+ * Access: Op
+ */
+MLXSW_ITEM32(reg, peabfe, size, 0x00, 0, 9);
+
+/* reg_peabfe_bf_entry_state
+ * Bloom filter state
+ * 0 - Clear
+ * 1 - Set
+ * Access: RW
+ */
+MLXSW_ITEM32_INDEXED(reg, peabfe, bf_entry_state,
+		     MLXSW_REG_PEABFE_BASE_LEN,	31, 1,
+		     MLXSW_REG_PEABFE_BF_REC_LEN, 0x00, false);
+
+/* reg_peabfe_bf_entry_bank
+ * Bloom filter bank ID
+ * Range 0..cap_max_erp_table_banks-1
+ * Access: Index
+ */
+MLXSW_ITEM32_INDEXED(reg, peabfe, bf_entry_bank,
+		     MLXSW_REG_PEABFE_BASE_LEN,	24, 4,
+		     MLXSW_REG_PEABFE_BF_REC_LEN, 0x00, false);
+
+/* reg_peabfe_bf_entry_index
+ * Bloom filter entry index
+ * Range 0..2^cap_max_bf_log-1
+ * Access: Index
+ */
+MLXSW_ITEM32_INDEXED(reg, peabfe, bf_entry_index,
+		     MLXSW_REG_PEABFE_BASE_LEN,	0, 24,
+		     MLXSW_REG_PEABFE_BF_REC_LEN, 0x00, false);
+
+static inline void mlxsw_reg_peabfe_pack(char *payload)
+{
+	MLXSW_REG_ZERO(peabfe, payload);
+}
+
+static inline void mlxsw_reg_peabfe_rec_pack(char *payload, int rec_index,
+					     u8 state, u8 bank, u32 bf_index)
+{
+	u8 num_rec = mlxsw_reg_peabfe_size_get(payload);
+
+	if (rec_index >= num_rec)
+		mlxsw_reg_peabfe_size_set(payload, rec_index + 1);
+	mlxsw_reg_peabfe_bf_entry_state_set(payload, rec_index, state);
+	mlxsw_reg_peabfe_bf_entry_bank_set(payload, rec_index, bank);
+	mlxsw_reg_peabfe_bf_entry_index_set(payload, rec_index, bf_index);
+}
+
 /* IEDR - Infrastructure Entry Delete Register
  * ----------------------------------------------------
  * This register is used for deleting entries from the entry tables.
@@ -9608,6 +9674,7 @@ static const struct mlxsw_reg_info *mlxsw_reg_infos[] = {
 	MLXSW_REG(pemrbt),
 	MLXSW_REG(ptce2),
 	MLXSW_REG(perpt),
+	MLXSW_REG(peabfe),
 	MLXSW_REG(perar),
 	MLXSW_REG(ptce3),
 	MLXSW_REG(percr),
-- 
2.20.0