mlxsw: spectrum_acl_bloom_filter: Make mlxsw_sp_acl_bf_key_encode() more flexible

Spectrum-4 will calculate hash function for bloom filter differently from
the existing ASICs.

One of the changes is related to the way that the chunks will be build -
without padding.

As preparation for support of Spectrum-4 bloom filter, make
mlxsw_sp_acl_bf_key_encode() more flexible, so it will be able to use it
for Spectrum-4 as well.
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_bloom_filter.c

@@ -116,9 +116,10 @@ static u16 mlxsw_sp_acl_bf_crc(const u8 *buffer, size_t len)
 }
 
 static void
-mlxsw_sp_acl_bf_key_encode(struct mlxsw_sp_acl_atcam_region *aregion,
-			   struct mlxsw_sp_acl_atcam_entry *aentry,
-			   char *output, u8 *len)
+__mlxsw_sp_acl_bf_key_encode(struct mlxsw_sp_acl_atcam_region *aregion,
+			     struct mlxsw_sp_acl_atcam_entry *aentry,
+			     char *output, u8 *len, u8 max_chunks, u8 pad_bytes,
+			     u8 key_offset, u8 chunk_key_len, u8 chunk_len)
 {
 	struct mlxsw_afk_key_info *key_info = aregion->region->key_info;
 	u8 chunk_index, chunk_count, block_count;
@@ -129,17 +130,30 @@ mlxsw_sp_acl_bf_key_encode(struct mlxsw_sp_acl_atcam_region *aregion,
 	chunk_count = 1 + ((block_count - 1) >> 2);
 	erp_region_id = cpu_to_be16(aentry->ht_key.erp_id |
 				   (aregion->region->id << 4));
-	for (chunk_index = MLXSW_BLOOM_KEY_CHUNKS - chunk_count;
-	     chunk_index < MLXSW_BLOOM_KEY_CHUNKS; chunk_index++) {
-		memset(chunk, 0, MLXSW_BLOOM_CHUNK_PAD_BYTES);
-		memcpy(chunk + MLXSW_BLOOM_CHUNK_PAD_BYTES, &erp_region_id,
+	for (chunk_index = max_chunks - chunk_count; chunk_index < max_chunks;
+	     chunk_index++) {
+		memset(chunk, 0, pad_bytes);
+		memcpy(chunk + pad_bytes, &erp_region_id,
 		       sizeof(erp_region_id));
-		memcpy(chunk + MLXSW_BLOOM_CHUNK_KEY_OFFSET,
+		memcpy(chunk + key_offset,
 		       &aentry->enc_key[chunk_key_offsets[chunk_index]],
-		       MLXSW_BLOOM_CHUNK_KEY_BYTES);
-		chunk += MLXSW_BLOOM_KEY_CHUNK_BYTES;
+		       chunk_key_len);
+		chunk += chunk_len;
 	}
-	*len = chunk_count * MLXSW_BLOOM_KEY_CHUNK_BYTES;
+	*len = chunk_count * chunk_len;
+}
+
+static void
+mlxsw_sp_acl_bf_key_encode(struct mlxsw_sp_acl_atcam_region *aregion,
+			   struct mlxsw_sp_acl_atcam_entry *aentry,
+			   char *output, u8 *len)
+{
+	__mlxsw_sp_acl_bf_key_encode(aregion, aentry, output, len,
+				     MLXSW_BLOOM_KEY_CHUNKS,
+				     MLXSW_BLOOM_CHUNK_PAD_BYTES,
+				     MLXSW_BLOOM_CHUNK_KEY_OFFSET,
+				     MLXSW_BLOOM_CHUNK_KEY_BYTES,
+				     MLXSW_BLOOM_KEY_CHUNK_BYTES);
 }
 
 static unsigned int