net: dsa: sja1105: fix dynamic access to L2 Address Lookup table for SJA1110

The SJA1105P/Q/R/S and SJA1110 may have the same layout for the command
to read/write/search for L2 Address Lookup entries, but as explained in
the comments at the beginning of the sja1105_dynamic_config.c file, the
command portion of the buffer is at the end, and we need to obtain a
pointer to it by adding the length of the entry to the buffer.

Alas, the length of an L2 Address Lookup entry is larger in SJA1110 than
it is for SJA1105P/Q/R/S, so we need to create a common helper to access
the command buffer, and this receives as argument the length of the
entry buffer.

Fixes: 3e77e59b ("net: dsa: sja1105: add support for the SJA1110 switch family")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/sja1105/sja1105_dynamic_config.c

@@ -258,11 +258,11 @@ sja1110_vl_policing_cmd_packing(void *buf, struct sja1105_dyn_cmd *cmd,
 }
 
 static void
-sja1105pqrs_l2_lookup_cmd_packing(void *buf, struct sja1105_dyn_cmd *cmd,
-				  enum packing_op op)
+sja1105pqrs_common_l2_lookup_cmd_packing(void *buf, struct sja1105_dyn_cmd *cmd,
+					 enum packing_op op, int entry_size)
 {
-	u8 *p = buf + SJA1105PQRS_SIZE_L2_LOOKUP_ENTRY;
 	const int size = SJA1105_SIZE_DYN_CMD;
+	u8 *p = buf + entry_size;
 	u64 hostcmd;
 
 	sja1105_packing(p, &cmd->valid,    31, 31, size, op);
@@ -317,6 +317,24 @@ sja1105pqrs_l2_lookup_cmd_packing(void *buf, struct sja1105_dyn_cmd *cmd,
 			SJA1105PQRS_SIZE_L2_LOOKUP_ENTRY, op);
 }
 
+static void
+sja1105pqrs_l2_lookup_cmd_packing(void *buf, struct sja1105_dyn_cmd *cmd,
+				  enum packing_op op)
+{
+	int size = SJA1105PQRS_SIZE_L2_LOOKUP_ENTRY;
+
+	return sja1105pqrs_common_l2_lookup_cmd_packing(buf, cmd, op, size);
+}
+
+static void
+sja1110_l2_lookup_cmd_packing(void *buf, struct sja1105_dyn_cmd *cmd,
+			      enum packing_op op)
+{
+	int size = SJA1110_SIZE_L2_LOOKUP_ENTRY;
+
+	return sja1105pqrs_common_l2_lookup_cmd_packing(buf, cmd, op, size);
+}
+
 /* The switch is so retarded that it makes our command/entry abstraction
  * crumble apart.
  *
@@ -1055,7 +1073,7 @@ const struct sja1105_dynamic_table_ops sja1110_dyn_ops[BLK_IDX_MAX_DYN] = {
 	},
 	[BLK_IDX_L2_LOOKUP] = {
 		.entry_packing = sja1110_dyn_l2_lookup_entry_packing,
-		.cmd_packing = sja1105pqrs_l2_lookup_cmd_packing,
+		.cmd_packing = sja1110_l2_lookup_cmd_packing,
 		.access = (OP_READ | OP_WRITE | OP_DEL | OP_SEARCH),
 		.max_entry_count = SJA1105_MAX_L2_LOOKUP_COUNT,
 		.packed_size = SJA1110_SIZE_L2_LOOKUP_DYN_CMD,