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// SPDX-License-Identifier: GPL-2.0
/*
* Functions for dibs loopback/loopback-ism device.
*
* Copyright (c) 2024, Alibaba Inc.
*
* Author: Wen Gu <guwen@linux.alibaba.com>
* Tony Lu <tonylu@linux.alibaba.com>
*
*/
#include <linux/dibs.h>
#include <linux/slab.h>
#include <linux/types.h>
#include "dibs_loopback.h"
/* global loopback device */
static struct dibs_lo_dev *lo_dev;
static u16 dibs_lo_get_fabric_id(struct dibs_dev *dibs)
{
return DIBS_LOOPBACK_FABRIC;
}
static const struct dibs_dev_ops dibs_lo_ops = {
.get_fabric_id = dibs_lo_get_fabric_id,
};
static void dibs_lo_dev_exit(struct dibs_lo_dev *ldev)
{
dibs_dev_del(ldev->dibs);
}
static int dibs_lo_dev_probe(void)
{
struct dibs_lo_dev *ldev;
struct dibs_dev *dibs;
int ret;
ldev = kzalloc(sizeof(*ldev), GFP_KERNEL);
if (!ldev)
return -ENOMEM;
dibs = dibs_dev_alloc();
if (!dibs) {
kfree(ldev);
return -ENOMEM;
}
ldev->dibs = dibs;
dibs->drv_priv = ldev;
dibs->ops = &dibs_lo_ops;
ret = dibs_dev_add(dibs);
if (ret)
goto err_reg;
lo_dev = ldev;
return 0;
err_reg:
/* pairs with dibs_dev_alloc() */
kfree(dibs);
kfree(ldev);
return ret;
}
static void dibs_lo_dev_remove(void)
{
if (!lo_dev)
return;
dibs_lo_dev_exit(lo_dev);
/* pairs with dibs_dev_alloc() */
kfree(lo_dev->dibs);
kfree(lo_dev);
lo_dev = NULL;
}
int dibs_loopback_init(void)
{
return dibs_lo_dev_probe();
}
void dibs_loopback_exit(void)
{
dibs_lo_dev_remove();
}
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