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/*
* Copyright (c) 2020 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __CNAT_INLINE_H__
#define __CNAT_INLINE_H__
#include <cnat/cnat_types.h>
always_inline int
cnat_ts_is_free_index (u32 index)
{
u32 pidx = index >> (32 - CNAT_TS_MPOOL_BITS);
index = index & (0xffffffff >> CNAT_TS_MPOOL_BITS);
return pool_is_free_index (cnat_timestamps.ts_pools[pidx], index);
}
always_inline cnat_timestamp_t *
cnat_timestamp_get (u32 index)
{
/* 6 top bits for choosing pool */
u32 pidx = index >> (32 - CNAT_TS_MPOOL_BITS);
index = index & (0xffffffff >> CNAT_TS_MPOOL_BITS);
return pool_elt_at_index (cnat_timestamps.ts_pools[pidx], index);
}
always_inline cnat_timestamp_t *
cnat_timestamp_get_if_valid (u32 index)
{
/* 6 top bits for choosing pool */
u32 pidx = index >> (32 - CNAT_TS_MPOOL_BITS);
index = index & (0xffffffff >> CNAT_TS_MPOOL_BITS);
if (pidx >= cnat_timestamps.next_empty_pool_idx)
return (NULL);
if (pool_is_free_index (cnat_timestamps.ts_pools[pidx], index))
return (NULL);
return pool_elt_at_index (cnat_timestamps.ts_pools[pidx], index);
}
always_inline index_t
cnat_timestamp_alloc ()
{
cnat_timestamp_t *ts;
u32 index, pool_sz;
uword pidx;
clib_spinlock_lock (&cnat_timestamps.ts_lock);
pidx = clib_bitmap_first_set (cnat_timestamps.ts_free);
pool_sz = 1 << (CNAT_TS_BASE_SIZE + pidx);
ASSERT (pidx <= cnat_timestamps.next_empty_pool_idx);
if (pidx == cnat_timestamps.next_empty_pool_idx)
pool_init_fixed (
cnat_timestamps.ts_pools[cnat_timestamps.next_empty_pool_idx++],
pool_sz);
pool_get (cnat_timestamps.ts_pools[pidx], ts);
if (pool_elts (cnat_timestamps.ts_pools[pidx]) == pool_sz)
clib_bitmap_set (cnat_timestamps.ts_free, pidx, 0);
clib_spinlock_unlock (&cnat_timestamps.ts_lock);
index = (u32) pidx << (32 - CNAT_TS_MPOOL_BITS);
return index | (ts - cnat_timestamps.ts_pools[pidx]);
}
always_inline void
cnat_timestamp_destroy (u32 index)
{
u32 pidx = index >> (32 - CNAT_TS_MPOOL_BITS);
index = index & (0xffffffff >> CNAT_TS_MPOOL_BITS);
clib_spinlock_lock (&cnat_timestamps.ts_lock);
pool_put_index (cnat_timestamps.ts_pools[pidx], index);
clib_bitmap_set (cnat_timestamps.ts_free, pidx, 1);
clib_spinlock_unlock (&cnat_timestamps.ts_lock);
}
always_inline u32
cnat_timestamp_new (f64 t)
{
index_t index = cnat_timestamp_alloc ();
cnat_timestamp_t *ts = cnat_timestamp_get (index);
ts->last_seen = t;
ts->lifetime = cnat_main.session_max_age;
ts->refcnt = CNAT_TIMESTAMP_INIT_REFCNT;
return index;
}
always_inline void
cnat_timestamp_inc_refcnt (u32 index)
{
cnat_timestamp_t *ts = cnat_timestamp_get (index);
clib_atomic_add_fetch (&ts->refcnt, 1);
}
always_inline void
cnat_timestamp_update (u32 index, f64 t)
{
cnat_timestamp_t *ts = cnat_timestamp_get (index);
ts->last_seen = t;
}
always_inline void
cnat_timestamp_set_lifetime (u32 index, u16 lifetime)
{
cnat_timestamp_t *ts = cnat_timestamp_get (index);
ts->lifetime = lifetime;
}
always_inline f64
cnat_timestamp_exp (u32 index)
{
f64 t;
cnat_timestamp_t *ts = cnat_timestamp_get_if_valid (index);
if (NULL == ts)
return -1;
t = ts->last_seen + (f64) ts->lifetime;
return t;
}
always_inline void
cnat_timestamp_free (u32 index)
{
cnat_timestamp_t *ts = cnat_timestamp_get_if_valid (index);
if (NULL == ts)
return;
if (0 == clib_atomic_sub_fetch (&ts->refcnt, 1))
cnat_timestamp_destroy (index);
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
#endif
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