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linux-sg2042/drivers/infiniband/hw/mlx5/mad.c

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/*
* Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/mlx5/cmd.h>
#include <linux/mlx5/vport.h>
#include <rdma/ib_mad.h>
#include <rdma/ib_smi.h>
#include <rdma/ib_pma.h>
#include "mlx5_ib.h"
#include "cmd.h"
enum {
MLX5_IB_VENDOR_CLASS1 = 0x9,
MLX5_IB_VENDOR_CLASS2 = 0xa
};
static bool can_do_mad_ifc(struct mlx5_ib_dev *dev, u8 port_num,
struct ib_mad *in_mad)
{
if (in_mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED &&
in_mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
return true;
return dev->mdev->port_caps[port_num - 1].has_smi;
}
static int mlx5_MAD_IFC(struct mlx5_ib_dev *dev, int ignore_mkey,
int ignore_bkey, u8 port, const struct ib_wc *in_wc,
const struct ib_grh *in_grh, const void *in_mad,
void *response_mad)
{
u8 op_modifier = 0;
if (!can_do_mad_ifc(dev, port, (struct ib_mad *)in_mad))
return -EPERM;
/* Key check traps can't be generated unless we have in_wc to
* tell us where to send the trap.
*/
if (ignore_mkey || !in_wc)
op_modifier |= 0x1;
if (ignore_bkey || !in_wc)
op_modifier |= 0x2;
return mlx5_cmd_mad_ifc(dev->mdev, in_mad, response_mad, op_modifier,
port);
}
static int process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
const struct ib_wc *in_wc, const struct ib_grh *in_grh,
const struct ib_mad *in_mad, struct ib_mad *out_mad)
{
u16 slid;
int err;
slid = in_wc ? ib_lid_cpu16(in_wc->slid) : be16_to_cpu(IB_LID_PERMISSIVE);
if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && slid == 0)
return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
in_mad->mad_hdr.method != IB_MGMT_METHOD_SET &&
in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS)
return IB_MAD_RESULT_SUCCESS;
/* Don't process SMInfo queries -- the SMA can't handle them.
*/
if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO)
return IB_MAD_RESULT_SUCCESS;
} else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
in_mad->mad_hdr.mgmt_class == MLX5_IB_VENDOR_CLASS1 ||
in_mad->mad_hdr.mgmt_class == MLX5_IB_VENDOR_CLASS2 ||
in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_CONG_MGMT) {
if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
in_mad->mad_hdr.method != IB_MGMT_METHOD_SET)
return IB_MAD_RESULT_SUCCESS;
} else {
return IB_MAD_RESULT_SUCCESS;
}
err = mlx5_MAD_IFC(to_mdev(ibdev),
mad_flags & IB_MAD_IGNORE_MKEY,
mad_flags & IB_MAD_IGNORE_BKEY,
port_num, in_wc, in_grh, in_mad, out_mad);
if (err)
return IB_MAD_RESULT_FAILURE;
/* set return bit in status of directed route responses */
if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
/* no response for trap repress */
return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
}
static void pma_cnt_ext_assign(struct ib_pma_portcounters_ext *pma_cnt_ext,
void *out)
{
#define MLX5_SUM_CNT(p, cntr1, cntr2) \
(MLX5_GET64(query_vport_counter_out, p, cntr1) + \
MLX5_GET64(query_vport_counter_out, p, cntr2))
pma_cnt_ext->port_xmit_data =
cpu_to_be64(MLX5_SUM_CNT(out, transmitted_ib_unicast.octets,
transmitted_ib_multicast.octets) >> 2);
pma_cnt_ext->port_rcv_data =
cpu_to_be64(MLX5_SUM_CNT(out, received_ib_unicast.octets,
received_ib_multicast.octets) >> 2);
pma_cnt_ext->port_xmit_packets =
cpu_to_be64(MLX5_SUM_CNT(out, transmitted_ib_unicast.packets,
transmitted_ib_multicast.packets));
pma_cnt_ext->port_rcv_packets =
cpu_to_be64(MLX5_SUM_CNT(out, received_ib_unicast.packets,
received_ib_multicast.packets));
pma_cnt_ext->port_unicast_xmit_packets =
MLX5_GET64_BE(query_vport_counter_out,
out, transmitted_ib_unicast.packets);
pma_cnt_ext->port_unicast_rcv_packets =
MLX5_GET64_BE(query_vport_counter_out,
out, received_ib_unicast.packets);
pma_cnt_ext->port_multicast_xmit_packets =
MLX5_GET64_BE(query_vport_counter_out,
out, transmitted_ib_multicast.packets);
pma_cnt_ext->port_multicast_rcv_packets =
MLX5_GET64_BE(query_vport_counter_out,
out, received_ib_multicast.packets);
}
static void pma_cnt_assign(struct ib_pma_portcounters *pma_cnt,
void *out)
{
/* Traffic counters will be reported in
* their 64bit form via ib_pma_portcounters_ext by default.
*/
void *out_pma = MLX5_ADDR_OF(ppcnt_reg, out,
counter_set);
#define MLX5_ASSIGN_PMA_CNTR(counter_var, counter_name) { \
counter_var = MLX5_GET_BE(typeof(counter_var), \
ib_port_cntrs_grp_data_layout, \
out_pma, counter_name); \
}
MLX5_ASSIGN_PMA_CNTR(pma_cnt->symbol_error_counter,
symbol_error_counter);
MLX5_ASSIGN_PMA_CNTR(pma_cnt->link_error_recovery_counter,
link_error_recovery_counter);
MLX5_ASSIGN_PMA_CNTR(pma_cnt->link_downed_counter,
link_downed_counter);
MLX5_ASSIGN_PMA_CNTR(pma_cnt->port_rcv_errors,
port_rcv_errors);
MLX5_ASSIGN_PMA_CNTR(pma_cnt->port_rcv_remphys_errors,
port_rcv_remote_physical_errors);
MLX5_ASSIGN_PMA_CNTR(pma_cnt->port_rcv_switch_relay_errors,
port_rcv_switch_relay_errors);
MLX5_ASSIGN_PMA_CNTR(pma_cnt->port_xmit_discards,
port_xmit_discards);
MLX5_ASSIGN_PMA_CNTR(pma_cnt->port_xmit_constraint_errors,
port_xmit_constraint_errors);
MLX5_ASSIGN_PMA_CNTR(pma_cnt->port_xmit_wait,
port_xmit_wait);
MLX5_ASSIGN_PMA_CNTR(pma_cnt->port_rcv_constraint_errors,
port_rcv_constraint_errors);
MLX5_ASSIGN_PMA_CNTR(pma_cnt->link_overrun_errors,
link_overrun_errors);
MLX5_ASSIGN_PMA_CNTR(pma_cnt->vl15_dropped,
vl_15_dropped);
}
static int process_pma_cmd(struct mlx5_ib_dev *dev, u8 port_num,
const struct ib_mad *in_mad, struct ib_mad *out_mad)
{
struct mlx5_core_dev *mdev;
bool native_port = true;
u8 mdev_port_num;
void *out_cnt;
int err;
mdev = mlx5_ib_get_native_port_mdev(dev, port_num, &mdev_port_num);
if (!mdev) {
/* Fail to get the native port, likely due to 2nd port is still
* unaffiliated. In such case default to 1st port and attached
* PF device.
*/
native_port = false;
mdev = dev->mdev;
mdev_port_num = 1;
}
/* Declaring support of extended counters */
if (in_mad->mad_hdr.attr_id == IB_PMA_CLASS_PORT_INFO) {
struct ib_class_port_info cpi = {};
cpi.capability_mask = IB_PMA_CLASS_CAP_EXT_WIDTH;
memcpy((out_mad->data + 40), &cpi, sizeof(cpi));
err = IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
goto done;
}
if (in_mad->mad_hdr.attr_id == IB_PMA_PORT_COUNTERS_EXT) {
struct ib_pma_portcounters_ext *pma_cnt_ext =
(struct ib_pma_portcounters_ext *)(out_mad->data + 40);
int sz = MLX5_ST_SZ_BYTES(query_vport_counter_out);
out_cnt = kvzalloc(sz, GFP_KERNEL);
if (!out_cnt) {
err = IB_MAD_RESULT_FAILURE;
goto done;
}
err = mlx5_core_query_vport_counter(mdev, 0, 0,
mdev_port_num, out_cnt, sz);
if (!err)
pma_cnt_ext_assign(pma_cnt_ext, out_cnt);
} else {
struct ib_pma_portcounters *pma_cnt =
(struct ib_pma_portcounters *)(out_mad->data + 40);
int sz = MLX5_ST_SZ_BYTES(ppcnt_reg);
out_cnt = kvzalloc(sz, GFP_KERNEL);
if (!out_cnt) {
err = IB_MAD_RESULT_FAILURE;
goto done;
}
err = mlx5_core_query_ib_ppcnt(mdev, mdev_port_num,
out_cnt, sz);
if (!err)
pma_cnt_assign(pma_cnt, out_cnt);
}
kvfree(out_cnt);
err = err ? IB_MAD_RESULT_FAILURE :
IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
done:
if (native_port)
mlx5_ib_put_native_port_mdev(dev, port_num);
return err;
}
int mlx5_ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
const struct ib_wc *in_wc, const struct ib_grh *in_grh,
const struct ib_mad_hdr *in, size_t in_mad_size,
struct ib_mad_hdr *out, size_t *out_mad_size,
u16 *out_mad_pkey_index)
{
struct mlx5_ib_dev *dev = to_mdev(ibdev);
const struct ib_mad *in_mad = (const struct ib_mad *)in;
struct ib_mad *out_mad = (struct ib_mad *)out;
int ret;
if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) ||
*out_mad_size != sizeof(*out_mad)))
return IB_MAD_RESULT_FAILURE;
memset(out_mad->data, 0, sizeof(out_mad->data));
if (MLX5_CAP_GEN(dev->mdev, vport_counters) &&
in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT &&
in_mad->mad_hdr.method == IB_MGMT_METHOD_GET) {
ret = process_pma_cmd(dev, port_num, in_mad, out_mad);
} else {
ret = process_mad(ibdev, mad_flags, port_num, in_wc, in_grh,
in_mad, out_mad);
}
return ret;
}
int mlx5_query_ext_port_caps(struct mlx5_ib_dev *dev, u8 port)
{
struct ib_smp *in_mad = NULL;
struct ib_smp *out_mad = NULL;
int err = -ENOMEM;
u16 packet_error;
in_mad = kzalloc(sizeof(*in_mad), GFP_KERNEL);
out_mad = kmalloc(sizeof(*out_mad), GFP_KERNEL);
if (!in_mad || !out_mad)
goto out;
init_query_mad(in_mad);
in_mad->attr_id = MLX5_ATTR_EXTENDED_PORT_INFO;
in_mad->attr_mod = cpu_to_be32(port);
err = mlx5_MAD_IFC(dev, 1, 1, 1, NULL, NULL, in_mad, out_mad);
packet_error = be16_to_cpu(out_mad->status);
dev->mdev->port_caps[port - 1].ext_port_cap = (!err && !packet_error) ?
MLX_EXT_PORT_CAP_FLAG_EXTENDED_PORT_INFO : 0;
out:
kfree(in_mad);
kfree(out_mad);
return err;
}
int mlx5_query_mad_ifc_smp_attr_node_info(struct ib_device *ibdev,
struct ib_smp *out_mad)
{
struct ib_smp *in_mad = NULL;
int err = -ENOMEM;
in_mad = kzalloc(sizeof(*in_mad), GFP_KERNEL);
if (!in_mad)
return -ENOMEM;
init_query_mad(in_mad);
in_mad->attr_id = IB_SMP_ATTR_NODE_INFO;
err = mlx5_MAD_IFC(to_mdev(ibdev), 1, 1, 1, NULL, NULL, in_mad,
out_mad);
kfree(in_mad);
return err;
}
int mlx5_query_mad_ifc_system_image_guid(struct ib_device *ibdev,
__be64 *sys_image_guid)
{
struct ib_smp *out_mad = NULL;
int err = -ENOMEM;
out_mad = kmalloc(sizeof(*out_mad), GFP_KERNEL);
if (!out_mad)
return -ENOMEM;
err = mlx5_query_mad_ifc_smp_attr_node_info(ibdev, out_mad);
if (err)
goto out;
memcpy(sys_image_guid, out_mad->data + 4, 8);
out:
kfree(out_mad);
return err;
}
int mlx5_query_mad_ifc_max_pkeys(struct ib_device *ibdev,
u16 *max_pkeys)
{
struct ib_smp *out_mad = NULL;
int err = -ENOMEM;
out_mad = kmalloc(sizeof(*out_mad), GFP_KERNEL);
if (!out_mad)
return -ENOMEM;
err = mlx5_query_mad_ifc_smp_attr_node_info(ibdev, out_mad);
if (err)
goto out;
*max_pkeys = be16_to_cpup((__be16 *)(out_mad->data + 28));
out:
kfree(out_mad);
return err;
}
int mlx5_query_mad_ifc_vendor_id(struct ib_device *ibdev,
u32 *vendor_id)
{
struct ib_smp *out_mad = NULL;
int err = -ENOMEM;
out_mad = kmalloc(sizeof(*out_mad), GFP_KERNEL);
if (!out_mad)
return -ENOMEM;
err = mlx5_query_mad_ifc_smp_attr_node_info(ibdev, out_mad);
if (err)
goto out;
*vendor_id = be32_to_cpup((__be32 *)(out_mad->data + 36)) & 0xffff;
out:
kfree(out_mad);
return err;
}
int mlx5_query_mad_ifc_node_desc(struct mlx5_ib_dev *dev, char *node_desc)
{
struct ib_smp *in_mad = NULL;
struct ib_smp *out_mad = NULL;
int err = -ENOMEM;
in_mad = kzalloc(sizeof(*in_mad), GFP_KERNEL);
out_mad = kmalloc(sizeof(*out_mad), GFP_KERNEL);
if (!in_mad || !out_mad)
goto out;
init_query_mad(in_mad);
in_mad->attr_id = IB_SMP_ATTR_NODE_DESC;
err = mlx5_MAD_IFC(dev, 1, 1, 1, NULL, NULL, in_mad, out_mad);
if (err)
goto out;
memcpy(node_desc, out_mad->data, IB_DEVICE_NODE_DESC_MAX);
out:
kfree(in_mad);
kfree(out_mad);
return err;
}
int mlx5_query_mad_ifc_node_guid(struct mlx5_ib_dev *dev, __be64 *node_guid)
{
struct ib_smp *in_mad = NULL;
struct ib_smp *out_mad = NULL;
int err = -ENOMEM;
in_mad = kzalloc(sizeof(*in_mad), GFP_KERNEL);
out_mad = kmalloc(sizeof(*out_mad), GFP_KERNEL);
if (!in_mad || !out_mad)
goto out;
init_query_mad(in_mad);
in_mad->attr_id = IB_SMP_ATTR_NODE_INFO;
err = mlx5_MAD_IFC(dev, 1, 1, 1, NULL, NULL, in_mad, out_mad);
if (err)
goto out;
memcpy(node_guid, out_mad->data + 12, 8);
out:
kfree(in_mad);
kfree(out_mad);
return err;
}
int mlx5_query_mad_ifc_pkey(struct ib_device *ibdev, u8 port, u16 index,
u16 *pkey)
{
struct ib_smp *in_mad = NULL;
struct ib_smp *out_mad = NULL;
int err = -ENOMEM;
in_mad = kzalloc(sizeof(*in_mad), GFP_KERNEL);
out_mad = kmalloc(sizeof(*out_mad), GFP_KERNEL);
if (!in_mad || !out_mad)
goto out;
init_query_mad(in_mad);
in_mad->attr_id = IB_SMP_ATTR_PKEY_TABLE;
in_mad->attr_mod = cpu_to_be32(index / 32);
err = mlx5_MAD_IFC(to_mdev(ibdev), 1, 1, port, NULL, NULL, in_mad,
out_mad);
if (err)
goto out;
*pkey = be16_to_cpu(((__be16 *)out_mad->data)[index % 32]);
out:
kfree(in_mad);
kfree(out_mad);
return err;
}
int mlx5_query_mad_ifc_gids(struct ib_device *ibdev, u8 port, int index,
union ib_gid *gid)
{
struct ib_smp *in_mad = NULL;
struct ib_smp *out_mad = NULL;
int err = -ENOMEM;
in_mad = kzalloc(sizeof(*in_mad), GFP_KERNEL);
out_mad = kmalloc(sizeof(*out_mad), GFP_KERNEL);
if (!in_mad || !out_mad)
goto out;
init_query_mad(in_mad);
in_mad->attr_id = IB_SMP_ATTR_PORT_INFO;
in_mad->attr_mod = cpu_to_be32(port);
err = mlx5_MAD_IFC(to_mdev(ibdev), 1, 1, port, NULL, NULL, in_mad,
out_mad);
if (err)
goto out;
memcpy(gid->raw, out_mad->data + 8, 8);
init_query_mad(in_mad);
in_mad->attr_id = IB_SMP_ATTR_GUID_INFO;
in_mad->attr_mod = cpu_to_be32(index / 8);
err = mlx5_MAD_IFC(to_mdev(ibdev), 1, 1, port, NULL, NULL, in_mad,
out_mad);
if (err)
goto out;
memcpy(gid->raw + 8, out_mad->data + (index % 8) * 8, 8);
out:
kfree(in_mad);
kfree(out_mad);
return err;
}
int mlx5_query_mad_ifc_port(struct ib_device *ibdev, u8 port,
struct ib_port_attr *props)
{
struct mlx5_ib_dev *dev = to_mdev(ibdev);
struct mlx5_core_dev *mdev = dev->mdev;
struct ib_smp *in_mad = NULL;
struct ib_smp *out_mad = NULL;
int ext_active_speed;
int err = -ENOMEM;
in_mad = kzalloc(sizeof(*in_mad), GFP_KERNEL);
out_mad = kmalloc(sizeof(*out_mad), GFP_KERNEL);
if (!in_mad || !out_mad)
goto out;
/* props being zeroed by the caller, avoid zeroing it here */
init_query_mad(in_mad);
in_mad->attr_id = IB_SMP_ATTR_PORT_INFO;
in_mad->attr_mod = cpu_to_be32(port);
err = mlx5_MAD_IFC(dev, 1, 1, port, NULL, NULL, in_mad, out_mad);
if (err) {
mlx5_ib_warn(dev, "err %d\n", err);
goto out;
}
props->lid = be16_to_cpup((__be16 *)(out_mad->data + 16));
props->lmc = out_mad->data[34] & 0x7;
props->sm_lid = be16_to_cpup((__be16 *)(out_mad->data + 18));
props->sm_sl = out_mad->data[36] & 0xf;
props->state = out_mad->data[32] & 0xf;
props->phys_state = out_mad->data[33] >> 4;
props->port_cap_flags = be32_to_cpup((__be32 *)(out_mad->data + 20));
props->gid_tbl_len = out_mad->data[50];
props->max_msg_sz = 1 << MLX5_CAP_GEN(mdev, log_max_msg);
props->pkey_tbl_len = mdev->port_caps[port - 1].pkey_table_len;
props->bad_pkey_cntr = be16_to_cpup((__be16 *)(out_mad->data + 46));
props->qkey_viol_cntr = be16_to_cpup((__be16 *)(out_mad->data + 48));
props->active_width = out_mad->data[31] & 0xf;
props->active_speed = out_mad->data[35] >> 4;
props->max_mtu = out_mad->data[41] & 0xf;
props->active_mtu = out_mad->data[36] >> 4;
props->subnet_timeout = out_mad->data[51] & 0x1f;
props->max_vl_num = out_mad->data[37] >> 4;
props->init_type_reply = out_mad->data[41] >> 4;
if (props->port_cap_flags & IB_PORT_CAP_MASK2_SUP) {
props->port_cap_flags2 =
be16_to_cpup((__be16 *)(out_mad->data + 60));
if (props->port_cap_flags2 & IB_PORT_LINK_WIDTH_2X_SUP)
props->active_width = out_mad->data[31] & 0x1f;
}
/* Check if extended speeds (EDR/FDR/...) are supported */
if (props->port_cap_flags & IB_PORT_EXTENDED_SPEEDS_SUP) {
ext_active_speed = out_mad->data[62] >> 4;
switch (ext_active_speed) {
case 1:
props->active_speed = 16; /* FDR */
break;
case 2:
props->active_speed = 32; /* EDR */
break;
case 4:
if (props->port_cap_flags & IB_PORT_CAP_MASK2_SUP &&
props->port_cap_flags2 & IB_PORT_LINK_SPEED_HDR_SUP)
props->active_speed = IB_SPEED_HDR;
break;
}
}
/* If reported active speed is QDR, check if is FDR-10 */
if (props->active_speed == 4) {
if (mdev->port_caps[port - 1].ext_port_cap &
MLX_EXT_PORT_CAP_FLAG_EXTENDED_PORT_INFO) {
init_query_mad(in_mad);
in_mad->attr_id = MLX5_ATTR_EXTENDED_PORT_INFO;
in_mad->attr_mod = cpu_to_be32(port);
err = mlx5_MAD_IFC(dev, 1, 1, port,
NULL, NULL, in_mad, out_mad);
if (err)
goto out;
/* Checking LinkSpeedActive for FDR-10 */
if (out_mad->data[15] & 0x1)
props->active_speed = 8;
}
}
out:
kfree(in_mad);
kfree(out_mad);
return err;
}
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