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/*
* Copyright (c) 2016 Intel Corporation.
* 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 _PORT_BITMAP_H_
#define _PORT_BITMAP_H_
#ifdef __cplusplus
extern "C" {
#endif
/*
* Simple implementation of bitmap for all possible UDP ports [0-UINT16_MAX].
*/
#define MAX_PORT_NUM (UINT16_MAX + 1)
#define PORT_BLK(p) ((p) / (sizeof(uint32_t) * CHAR_BIT))
#define PORT_IDX(p) ((p) % (sizeof(uint32_t) * CHAR_BIT))
#define MAX_PORT_BLK PORT_BLK(MAX_PORT_NUM)
struct udp_pbm {
uint32_t nb_set; /* number of bits set. */
uint32_t blk; /* last block with free entry. */
uint32_t bm[MAX_PORT_BLK];
};
static inline void
udp_pbm_init(struct udp_pbm *pbm, uint32_t blk)
{
pbm->bm[0] = 1;
pbm->nb_set = 1;
pbm->blk = blk;
}
static inline void
udp_pbm_set(struct udp_pbm *pbm, uint16_t port)
{
uint32_t i, b, v;
i = PORT_BLK(port);
b = 1 << PORT_IDX(port);
v = pbm->bm[i];
pbm->bm[i] = v | b;
pbm->nb_set += (v & b) == 0;
}
static inline void
udp_pbm_clear(struct udp_pbm *pbm, uint16_t port)
{
uint32_t i, b, v;
i = PORT_BLK(port);
b = 1 << PORT_IDX(port);
v = pbm->bm[i];
pbm->bm[i] = v & ~b;
pbm->nb_set -= (v & b) != 0;
}
static inline uint32_t
udp_pbm_check(const struct udp_pbm *pbm, uint16_t port)
{
uint32_t i, v;
i = PORT_BLK(port);
v = pbm->bm[i] >> PORT_IDX(port);
return v & 1;
}
static inline uint16_t
udp_pbm_find_range(struct udp_pbm *pbm, uint32_t start_blk, uint32_t end_blk)
{
uint32_t i, v;
uint16_t p;
if (pbm->nb_set == MAX_PORT_NUM)
return 0;
p = 0;
for (i = start_blk; i != end_blk; i++) {
i %= RTE_DIM(pbm->bm);
v = pbm->bm[i];
if (v != UINT32_MAX) {
for (p = i * (sizeof(pbm->bm[0]) * CHAR_BIT);
(v & 1) != 0; v >>= 1, p++)
;
pbm->blk = i;
break;
}
}
return p;
}
#ifdef __cplusplus
}
#endif
#endif /* _PORT_BITMAP_H_ */
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