On Tue, 2012-02-21 at 00:07 +0530, Mugunthan V N wrote:

TI CPSW ethernet switch has a built-in address lookup engine.  This patch adds
the code necessary for programming this module.

just some style notes.

[]

+struct ale_control_info {
+	const char	*name;
+	int		offset, port_offset;
+	int		shift, port_shift;
+	int		bits;
+};
+
+#define CTRL_GLOBAL(name, bit)		{#name, ALE_CONTROL, 0, bit, 0, 1}
+#define CTRL_UNK(name, shift, bits)	{#name, ALE_UNKNOWNVLAN, 0, shift, \
+						0, bits}
+#define CTRL_PORTCTL(name, start, bits)	{#name, ALE_PORTCTL, 4, start, 0, bits}

named initializers might be more readable,
embedding the index might be too.
[]

+struct cpsw_ale *cpsw_ale_create(struct cpsw_ale_params *params)
+{
+	struct cpsw_ale *ale;
+	int ret;
+
+	ret = -ENOMEM;
+	ale = kzalloc(sizeof(*ale), GFP_KERNEL);
+	if (WARN_ON(!ale))
+		return NULL;

The WARN_ON is unnecessary.  alloc failures get a dump_stack.

[]

+struct cpsw_ale {
+	struct cpsw_ale_params	params;
+	struct timer_list	timer;
+	unsigned long		ageout;
+	struct device_attribute ale_control_attr;
+#define control_attr_to_ale(attr)	\
+	container_of(attr, struct cpsw_ale, ale_control_attr);
+	struct device_attribute ale_table_attr;
+#define table_attr_to_ale(attr)		\
+	container_of(attr, struct cpsw_ale, ale_table_attr);
+};

Embedding the #defines in a struct makes it difficult to read.
Perhaps this is simpler:

struct cpsw_ale {
	struct cpsw_ale_params	params;
	struct timer_list	timer;
	unsigned long		ageout;
	struct device_attribute ale_control_attr;
	struct device_attribute ale_table_attr;
};

#define control_attr_to_ale(attr)	\
	container_of(attr, struct cpsw_ale, ale_control_attr);
#define table_attr_to_ale(attr)		\
	container_of(attr, struct cpsw_ale, ale_table_attr);