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linux_dsm_epyc7002/drivers/net/ethernet/ti/cpsw_ale.c
Mugunthan V N 0cd8f9cc06 drivers: net: cpsw: enable promiscuous mode support 
Enable promiscuous mode support for CPSW.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-23 13:12:14 -08:00

766 lines
17 KiB
C
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/*
* Texas Instruments 3-Port Ethernet Switch Address Lookup Engine
*
* Copyright (C) 2012 Texas Instruments
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/stat.h>
#include <linux/sysfs.h>
#include <linux/etherdevice.h>
#include "cpsw_ale.h"
#define BITMASK(bits) (BIT(bits) - 1)
#define ALE_ENTRY_BITS 68
#define ALE_ENTRY_WORDS DIV_ROUND_UP(ALE_ENTRY_BITS, 32)
#define ALE_VERSION_MAJOR(rev) ((rev >> 8) & 0xff)
#define ALE_VERSION_MINOR(rev) (rev & 0xff)
/* ALE Registers */
#define ALE_IDVER 0x00
#define ALE_CONTROL 0x08
#define ALE_PRESCALE 0x10
#define ALE_UNKNOWNVLAN 0x18
#define ALE_TABLE_CONTROL 0x20
#define ALE_TABLE 0x34
#define ALE_PORTCTL 0x40
#define ALE_TABLE_WRITE BIT(31)
#define ALE_TYPE_FREE 0
#define ALE_TYPE_ADDR 1
#define ALE_TYPE_VLAN 2
#define ALE_TYPE_VLAN_ADDR 3
#define ALE_UCAST_PERSISTANT 0
#define ALE_UCAST_UNTOUCHED 1
#define ALE_UCAST_OUI 2
#define ALE_UCAST_TOUCHED 3
static inline int cpsw_ale_get_field(u32 *ale_entry, u32 start, u32 bits)
{
int idx;
idx = start / 32;
start -= idx * 32;
idx = 2 - idx; /* flip */
return (ale_entry[idx] >> start) & BITMASK(bits);
}
static inline void cpsw_ale_set_field(u32 *ale_entry, u32 start, u32 bits,
u32 value)
{
int idx;
value &= BITMASK(bits);
idx = start / 32;
start -= idx * 32;
idx = 2 - idx; /* flip */
ale_entry[idx] &= ~(BITMASK(bits) << start);
ale_entry[idx] |= (value << start);
}
#define DEFINE_ALE_FIELD(name, start, bits) \
static inline int cpsw_ale_get_##name(u32 *ale_entry) \
{ \
return cpsw_ale_get_field(ale_entry, start, bits); \
} \
static inline void cpsw_ale_set_##name(u32 *ale_entry, u32 value) \
{ \
cpsw_ale_set_field(ale_entry, start, bits, value); \
}
DEFINE_ALE_FIELD(entry_type, 60, 2)
DEFINE_ALE_FIELD(vlan_id, 48, 12)
DEFINE_ALE_FIELD(mcast_state, 62, 2)
DEFINE_ALE_FIELD(port_mask, 66, 3)
DEFINE_ALE_FIELD(super, 65, 1)
DEFINE_ALE_FIELD(ucast_type, 62, 2)
DEFINE_ALE_FIELD(port_num, 66, 2)
DEFINE_ALE_FIELD(blocked, 65, 1)
DEFINE_ALE_FIELD(secure, 64, 1)
DEFINE_ALE_FIELD(vlan_untag_force, 24, 3)
DEFINE_ALE_FIELD(vlan_reg_mcast, 16, 3)
DEFINE_ALE_FIELD(vlan_unreg_mcast, 8, 3)
DEFINE_ALE_FIELD(vlan_member_list, 0, 3)
DEFINE_ALE_FIELD(mcast, 40, 1)
/* The MAC address field in the ALE entry cannot be macroized as above */
static inline void cpsw_ale_get_addr(u32 *ale_entry, u8 *addr)
{
int i;
for (i = 0; i < 6; i++)
addr[i] = cpsw_ale_get_field(ale_entry, 40 - 8*i, 8);
}
static inline void cpsw_ale_set_addr(u32 *ale_entry, u8 *addr)
{
int i;
for (i = 0; i < 6; i++)
cpsw_ale_set_field(ale_entry, 40 - 8*i, 8, addr[i]);
}
static int cpsw_ale_read(struct cpsw_ale *ale, int idx, u32 *ale_entry)
{
int i;
WARN_ON(idx > ale->params.ale_entries);
__raw_writel(idx, ale->params.ale_regs + ALE_TABLE_CONTROL);
for (i = 0; i < ALE_ENTRY_WORDS; i++)
ale_entry[i] = __raw_readl(ale->params.ale_regs +
ALE_TABLE + 4 * i);
return idx;
}
static int cpsw_ale_write(struct cpsw_ale *ale, int idx, u32 *ale_entry)
{
int i;
WARN_ON(idx > ale->params.ale_entries);
for (i = 0; i < ALE_ENTRY_WORDS; i++)
__raw_writel(ale_entry[i], ale->params.ale_regs +
ALE_TABLE + 4 * i);
__raw_writel(idx | ALE_TABLE_WRITE, ale->params.ale_regs +
ALE_TABLE_CONTROL);
return idx;
}
int cpsw_ale_match_addr(struct cpsw_ale *ale, u8 *addr, u16 vid)
{
u32 ale_entry[ALE_ENTRY_WORDS];
int type, idx;
for (idx = 0; idx < ale->params.ale_entries; idx++) {
u8 entry_addr[6];
cpsw_ale_read(ale, idx, ale_entry);
type = cpsw_ale_get_entry_type(ale_entry);
if (type != ALE_TYPE_ADDR && type != ALE_TYPE_VLAN_ADDR)
continue;
if (cpsw_ale_get_vlan_id(ale_entry) != vid)
continue;
cpsw_ale_get_addr(ale_entry, entry_addr);
if (ether_addr_equal(entry_addr, addr))
return idx;
}
return -ENOENT;
}
int cpsw_ale_match_vlan(struct cpsw_ale *ale, u16 vid)
{
u32 ale_entry[ALE_ENTRY_WORDS];
int type, idx;
for (idx = 0; idx < ale->params.ale_entries; idx++) {
cpsw_ale_read(ale, idx, ale_entry);
type = cpsw_ale_get_entry_type(ale_entry);
if (type != ALE_TYPE_VLAN)
continue;
if (cpsw_ale_get_vlan_id(ale_entry) == vid)
return idx;
}
return -ENOENT;
}
static int cpsw_ale_match_free(struct cpsw_ale *ale)
{
u32 ale_entry[ALE_ENTRY_WORDS];
int type, idx;
for (idx = 0; idx < ale->params.ale_entries; idx++) {
cpsw_ale_read(ale, idx, ale_entry);
type = cpsw_ale_get_entry_type(ale_entry);
if (type == ALE_TYPE_FREE)
return idx;
}
return -ENOENT;
}
static int cpsw_ale_find_ageable(struct cpsw_ale *ale)
{
u32 ale_entry[ALE_ENTRY_WORDS];
int type, idx;
for (idx = 0; idx < ale->params.ale_entries; idx++) {
cpsw_ale_read(ale, idx, ale_entry);
type = cpsw_ale_get_entry_type(ale_entry);
if (type != ALE_TYPE_ADDR && type != ALE_TYPE_VLAN_ADDR)
continue;
if (cpsw_ale_get_mcast(ale_entry))
continue;
type = cpsw_ale_get_ucast_type(ale_entry);
if (type != ALE_UCAST_PERSISTANT &&
type != ALE_UCAST_OUI)
return idx;
}
return -ENOENT;
}
static void cpsw_ale_flush_mcast(struct cpsw_ale *ale, u32 *ale_entry,
int port_mask)
{
int mask;
mask = cpsw_ale_get_port_mask(ale_entry);
if ((mask & port_mask) == 0)
return; /* ports dont intersect, not interested */
mask &= ~port_mask;
/* free if only remaining port is host port */
if (mask)
cpsw_ale_set_port_mask(ale_entry, mask);
else
cpsw_ale_set_entry_type(ale_entry, ALE_TYPE_FREE);
}
int cpsw_ale_flush_multicast(struct cpsw_ale *ale, int port_mask)
{
u32 ale_entry[ALE_ENTRY_WORDS];
int ret, idx;
for (idx = 0; idx < ale->params.ale_entries; idx++) {
cpsw_ale_read(ale, idx, ale_entry);
ret = cpsw_ale_get_entry_type(ale_entry);
if (ret != ALE_TYPE_ADDR && ret != ALE_TYPE_VLAN_ADDR)
continue;
if (cpsw_ale_get_mcast(ale_entry)) {
u8 addr[6];
cpsw_ale_get_addr(ale_entry, addr);
if (!is_broadcast_ether_addr(addr))
cpsw_ale_flush_mcast(ale, ale_entry, port_mask);
}
cpsw_ale_write(ale, idx, ale_entry);
}
return 0;
}
static void cpsw_ale_flush_ucast(struct cpsw_ale *ale, u32 *ale_entry,
int port_mask)
{
int port;
port = cpsw_ale_get_port_num(ale_entry);
if ((BIT(port) & port_mask) == 0)
return; /* ports dont intersect, not interested */
cpsw_ale_set_entry_type(ale_entry, ALE_TYPE_FREE);
}
int cpsw_ale_flush(struct cpsw_ale *ale, int port_mask)
{
u32 ale_entry[ALE_ENTRY_WORDS];
int ret, idx;
for (idx = 0; idx < ale->params.ale_entries; idx++) {
cpsw_ale_read(ale, idx, ale_entry);
ret = cpsw_ale_get_entry_type(ale_entry);
if (ret != ALE_TYPE_ADDR && ret != ALE_TYPE_VLAN_ADDR)
continue;
if (cpsw_ale_get_mcast(ale_entry))
cpsw_ale_flush_mcast(ale, ale_entry, port_mask);
else
cpsw_ale_flush_ucast(ale, ale_entry, port_mask);
cpsw_ale_write(ale, idx, ale_entry);
}
return 0;
}
static inline void cpsw_ale_set_vlan_entry_type(u32 *ale_entry,
int flags, u16 vid)
{
if (flags & ALE_VLAN) {
cpsw_ale_set_entry_type(ale_entry, ALE_TYPE_VLAN_ADDR);
cpsw_ale_set_vlan_id(ale_entry, vid);
} else {
cpsw_ale_set_entry_type(ale_entry, ALE_TYPE_ADDR);
}
}
int cpsw_ale_add_ucast(struct cpsw_ale *ale, u8 *addr, int port,
int flags, u16 vid)
{
u32 ale_entry[ALE_ENTRY_WORDS] = {0, 0, 0};
int idx;
cpsw_ale_set_vlan_entry_type(ale_entry, flags, vid);
cpsw_ale_set_addr(ale_entry, addr);
cpsw_ale_set_ucast_type(ale_entry, ALE_UCAST_PERSISTANT);
cpsw_ale_set_secure(ale_entry, (flags & ALE_SECURE) ? 1 : 0);
cpsw_ale_set_blocked(ale_entry, (flags & ALE_BLOCKED) ? 1 : 0);
cpsw_ale_set_port_num(ale_entry, port);
idx = cpsw_ale_match_addr(ale, addr, (flags & ALE_VLAN) ? vid : 0);
if (idx < 0)
idx = cpsw_ale_match_free(ale);
if (idx < 0)
idx = cpsw_ale_find_ageable(ale);
if (idx < 0)
return -ENOMEM;
cpsw_ale_write(ale, idx, ale_entry);
return 0;
}
int cpsw_ale_del_ucast(struct cpsw_ale *ale, u8 *addr, int port,
int flags, u16 vid)
{
u32 ale_entry[ALE_ENTRY_WORDS] = {0, 0, 0};
int idx;
idx = cpsw_ale_match_addr(ale, addr, (flags & ALE_VLAN) ? vid : 0);
if (idx < 0)
return -ENOENT;
cpsw_ale_set_entry_type(ale_entry, ALE_TYPE_FREE);
cpsw_ale_write(ale, idx, ale_entry);
return 0;
}
int cpsw_ale_add_mcast(struct cpsw_ale *ale, u8 *addr, int port_mask,
int flags, u16 vid, int mcast_state)
{
u32 ale_entry[ALE_ENTRY_WORDS] = {0, 0, 0};
int idx, mask;
idx = cpsw_ale_match_addr(ale, addr, (flags & ALE_VLAN) ? vid : 0);
if (idx >= 0)
cpsw_ale_read(ale, idx, ale_entry);
cpsw_ale_set_vlan_entry_type(ale_entry, flags, vid);
cpsw_ale_set_addr(ale_entry, addr);
cpsw_ale_set_super(ale_entry, (flags & ALE_BLOCKED) ? 1 : 0);
cpsw_ale_set_mcast_state(ale_entry, mcast_state);
mask = cpsw_ale_get_port_mask(ale_entry);
port_mask |= mask;
cpsw_ale_set_port_mask(ale_entry, port_mask);
if (idx < 0)
idx = cpsw_ale_match_free(ale);
if (idx < 0)
idx = cpsw_ale_find_ageable(ale);
if (idx < 0)
return -ENOMEM;
cpsw_ale_write(ale, idx, ale_entry);
return 0;
}
int cpsw_ale_del_mcast(struct cpsw_ale *ale, u8 *addr, int port_mask,
int flags, u16 vid)
{
u32 ale_entry[ALE_ENTRY_WORDS] = {0, 0, 0};
int idx;
idx = cpsw_ale_match_addr(ale, addr, (flags & ALE_VLAN) ? vid : 0);
if (idx < 0)
return -EINVAL;
cpsw_ale_read(ale, idx, ale_entry);
if (port_mask)
cpsw_ale_set_port_mask(ale_entry, port_mask);
else
cpsw_ale_set_entry_type(ale_entry, ALE_TYPE_FREE);
cpsw_ale_write(ale, idx, ale_entry);
return 0;
}
int cpsw_ale_add_vlan(struct cpsw_ale *ale, u16 vid, int port, int untag,
int reg_mcast, int unreg_mcast)
{
u32 ale_entry[ALE_ENTRY_WORDS] = {0, 0, 0};
int idx;
idx = cpsw_ale_match_vlan(ale, vid);
if (idx >= 0)
cpsw_ale_read(ale, idx, ale_entry);
cpsw_ale_set_entry_type(ale_entry, ALE_TYPE_VLAN);
cpsw_ale_set_vlan_id(ale_entry, vid);
cpsw_ale_set_vlan_untag_force(ale_entry, untag);
cpsw_ale_set_vlan_reg_mcast(ale_entry, reg_mcast);
cpsw_ale_set_vlan_unreg_mcast(ale_entry, unreg_mcast);
cpsw_ale_set_vlan_member_list(ale_entry, port);
if (idx < 0)
idx = cpsw_ale_match_free(ale);
if (idx < 0)
idx = cpsw_ale_find_ageable(ale);
if (idx < 0)
return -ENOMEM;
cpsw_ale_write(ale, idx, ale_entry);
return 0;
}
int cpsw_ale_del_vlan(struct cpsw_ale *ale, u16 vid, int port_mask)
{
u32 ale_entry[ALE_ENTRY_WORDS] = {0, 0, 0};
int idx;
idx = cpsw_ale_match_vlan(ale, vid);
if (idx < 0)
return -ENOENT;
cpsw_ale_read(ale, idx, ale_entry);
if (port_mask)
cpsw_ale_set_vlan_member_list(ale_entry, port_mask);
else
cpsw_ale_set_entry_type(ale_entry, ALE_TYPE_FREE);
cpsw_ale_write(ale, idx, ale_entry);
return 0;
}
struct ale_control_info {
const char *name;
int offset, port_offset;
int shift, port_shift;
int bits;
};
static const struct ale_control_info ale_controls[ALE_NUM_CONTROLS] = {
[ALE_ENABLE] = {
.name = "enable",
.offset = ALE_CONTROL,
.port_offset = 0,
.shift = 31,
.port_shift = 0,
.bits = 1,
},
[ALE_CLEAR] = {
.name = "clear",
.offset = ALE_CONTROL,
.port_offset = 0,
.shift = 30,
.port_shift = 0,
.bits = 1,
},
[ALE_AGEOUT] = {
.name = "ageout",
.offset = ALE_CONTROL,
.port_offset = 0,
.shift = 29,
.port_shift = 0,
.bits = 1,
},
[ALE_P0_UNI_FLOOD] = {
.name = "port0_unicast_flood",
.offset = ALE_CONTROL,
.port_offset = 0,
.shift = 8,
.port_shift = 0,
.bits = 1,
},
[ALE_VLAN_NOLEARN] = {
.name = "vlan_nolearn",
.offset = ALE_CONTROL,
.port_offset = 0,
.shift = 7,
.port_shift = 0,
.bits = 1,
},
[ALE_NO_PORT_VLAN] = {
.name = "no_port_vlan",
.offset = ALE_CONTROL,
.port_offset = 0,
.shift = 6,
.port_shift = 0,
.bits = 1,
},
[ALE_OUI_DENY] = {
.name = "oui_deny",
.offset = ALE_CONTROL,
.port_offset = 0,
.shift = 5,
.port_shift = 0,
.bits = 1,
},
[ALE_BYPASS] = {
.name = "bypass",
.offset = ALE_CONTROL,
.port_offset = 0,
.shift = 4,
.port_shift = 0,
.bits = 1,
},
[ALE_RATE_LIMIT_TX] = {
.name = "rate_limit_tx",
.offset = ALE_CONTROL,
.port_offset = 0,
.shift = 3,
.port_shift = 0,
.bits = 1,
},
[ALE_VLAN_AWARE] = {
.name = "vlan_aware",
.offset = ALE_CONTROL,
.port_offset = 0,
.shift = 2,
.port_shift = 0,
.bits = 1,
},
[ALE_AUTH_ENABLE] = {
.name = "auth_enable",
.offset = ALE_CONTROL,
.port_offset = 0,
.shift = 1,
.port_shift = 0,
.bits = 1,
},
[ALE_RATE_LIMIT] = {
.name = "rate_limit",
.offset = ALE_CONTROL,
.port_offset = 0,
.shift = 0,
.port_shift = 0,
.bits = 1,
},
[ALE_PORT_STATE] = {
.name = "port_state",
.offset = ALE_PORTCTL,
.port_offset = 4,
.shift = 0,
.port_shift = 0,
.bits = 2,
},
[ALE_PORT_DROP_UNTAGGED] = {
.name = "drop_untagged",
.offset = ALE_PORTCTL,
.port_offset = 4,
.shift = 2,
.port_shift = 0,
.bits = 1,
},
[ALE_PORT_DROP_UNKNOWN_VLAN] = {
.name = "drop_unknown",
.offset = ALE_PORTCTL,
.port_offset = 4,
.shift = 3,
.port_shift = 0,
.bits = 1,
},
[ALE_PORT_NOLEARN] = {
.name = "nolearn",
.offset = ALE_PORTCTL,
.port_offset = 4,
.shift = 4,
.port_shift = 0,
.bits = 1,
},
[ALE_PORT_NO_SA_UPDATE] = {
.name = "no_source_update",
.offset = ALE_PORTCTL,
.port_offset = 4,
.shift = 5,
.port_shift = 0,
.bits = 1,
},
[ALE_PORT_MCAST_LIMIT] = {
.name = "mcast_limit",
.offset = ALE_PORTCTL,
.port_offset = 4,
.shift = 16,
.port_shift = 0,
.bits = 8,
},
[ALE_PORT_BCAST_LIMIT] = {
.name = "bcast_limit",
.offset = ALE_PORTCTL,
.port_offset = 4,
.shift = 24,
.port_shift = 0,
.bits = 8,
},
[ALE_PORT_UNKNOWN_VLAN_MEMBER] = {
.name = "unknown_vlan_member",
.offset = ALE_UNKNOWNVLAN,
.port_offset = 0,
.shift = 0,
.port_shift = 0,
.bits = 6,
},
[ALE_PORT_UNKNOWN_MCAST_FLOOD] = {
.name = "unknown_mcast_flood",
.offset = ALE_UNKNOWNVLAN,
.port_offset = 0,
.shift = 8,
.port_shift = 0,
.bits = 6,
},
[ALE_PORT_UNKNOWN_REG_MCAST_FLOOD] = {
.name = "unknown_reg_flood",
.offset = ALE_UNKNOWNVLAN,
.port_offset = 0,
.shift = 16,
.port_shift = 0,
.bits = 6,
},
[ALE_PORT_UNTAGGED_EGRESS] = {
.name = "untagged_egress",
.offset = ALE_UNKNOWNVLAN,
.port_offset = 0,
.shift = 24,
.port_shift = 0,
.bits = 6,
},
};
int cpsw_ale_control_set(struct cpsw_ale *ale, int port, int control,
int value)
{
const struct ale_control_info *info;
int offset, shift;
u32 tmp, mask;
if (control < 0 || control >= ARRAY_SIZE(ale_controls))
return -EINVAL;
info = &ale_controls[control];
if (info->port_offset == 0 && info->port_shift == 0)
port = 0; /* global, port is a dont care */
if (port < 0 || port > ale->params.ale_ports)
return -EINVAL;
mask = BITMASK(info->bits);
if (value & ~mask)
return -EINVAL;
offset = info->offset + (port * info->port_offset);
shift = info->shift + (port * info->port_shift);
tmp = __raw_readl(ale->params.ale_regs + offset);
tmp = (tmp & ~(mask << shift)) | (value << shift);
__raw_writel(tmp, ale->params.ale_regs + offset);
return 0;
}
int cpsw_ale_control_get(struct cpsw_ale *ale, int port, int control)
{
const struct ale_control_info *info;
int offset, shift;
u32 tmp;
if (control < 0 || control >= ARRAY_SIZE(ale_controls))
return -EINVAL;
info = &ale_controls[control];
if (info->port_offset == 0 && info->port_shift == 0)
port = 0; /* global, port is a dont care */
if (port < 0 || port > ale->params.ale_ports)
return -EINVAL;
offset = info->offset + (port * info->port_offset);
shift = info->shift + (port * info->port_shift);
tmp = __raw_readl(ale->params.ale_regs + offset) >> shift;
return tmp & BITMASK(info->bits);
}
static void cpsw_ale_timer(unsigned long arg)
{
struct cpsw_ale *ale = (struct cpsw_ale *)arg;
cpsw_ale_control_set(ale, 0, ALE_AGEOUT, 1);
if (ale->ageout) {
ale->timer.expires = jiffies + ale->ageout;
add_timer(&ale->timer);
}
}
int cpsw_ale_set_ageout(struct cpsw_ale *ale, int ageout)
{
del_timer_sync(&ale->timer);
ale->ageout = ageout * HZ;
if (ale->ageout) {
ale->timer.expires = jiffies + ale->ageout;
add_timer(&ale->timer);
}
return 0;
}
void cpsw_ale_start(struct cpsw_ale *ale)
{
u32 rev;
rev = __raw_readl(ale->params.ale_regs + ALE_IDVER);
dev_dbg(ale->params.dev, "initialized cpsw ale revision %d.%d\n",
ALE_VERSION_MAJOR(rev), ALE_VERSION_MINOR(rev));
cpsw_ale_control_set(ale, 0, ALE_ENABLE, 1);
cpsw_ale_control_set(ale, 0, ALE_CLEAR, 1);
init_timer(&ale->timer);
ale->timer.data = (unsigned long)ale;
ale->timer.function = cpsw_ale_timer;
if (ale->ageout) {
ale->timer.expires = jiffies + ale->ageout;
add_timer(&ale->timer);
}
}
void cpsw_ale_stop(struct cpsw_ale *ale)
{
del_timer_sync(&ale->timer);
}
struct cpsw_ale *cpsw_ale_create(struct cpsw_ale_params *params)
{
struct cpsw_ale *ale;
ale = kzalloc(sizeof(*ale), GFP_KERNEL);
if (!ale)
return NULL;
ale->params = *params;
ale->ageout = ale->params.ale_ageout * HZ;
return ale;
}
int cpsw_ale_destroy(struct cpsw_ale *ale)
{
if (!ale)
return -EINVAL;
cpsw_ale_stop(ale);
cpsw_ale_control_set(ale, 0, ALE_ENABLE, 0);
kfree(ale);
return 0;
}
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