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/*
* Copyright (c) 2019 Ant Financial Services Group.
* 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_STATMAP_H_
#define _PORT_STATMAP_H_
#ifdef __cplusplus
extern "C" {
#endif
#define MAX_PORT_NUM (UINT16_MAX + 1)
#define ALLOC_PORT_START 0x8000
struct tle_psm {
uint32_t nb_used; /* Number of ports already in use. */
uint32_t next_alloc; /* Next port to try allocate. */
uint8_t stat[MAX_PORT_NUM]; /* Status of the port:
* 1) the most significant bit indicates
* if SO_REUSEPORT is allowed;
* 2) lowest 7 bits indicate # of streams
* using the port.
*/
};
static inline void
tle_psm_init(struct tle_psm *psm)
{
memset(psm, 0, sizeof(struct tle_psm));
psm->next_alloc = ALLOC_PORT_START;
}
static inline int
tle_psm_set(struct tle_psm *psm, uint16_t port, uint8_t reuseport)
{
if (psm->stat[port] == 0) {
/* port has not been used */
psm->stat[port]++;
if (reuseport)
psm->stat[port] |= 0x80;
} else {
/* port is used by some socket */
if (reuseport && (psm->stat[port] & 0x80)) {
/* all sockets set reuseport */
psm->stat[port]++;
} else
return -1;
}
return 0;
}
static inline void
tle_psm_clear(struct tle_psm *psm, uint16_t port)
{
psm->stat[port]--;
if ((psm->stat[port] & 0x7f) == 0)
psm->stat[port] = 0;
}
static inline uint8_t
tle_psm_check(const struct tle_psm *psm, uint16_t port)
{
return psm->stat[port];
}
static inline uint16_t
tle_psm_alloc_port(struct tle_psm *psm)
{
uint32_t i = psm->next_alloc;
for (; i < MAX_PORT_NUM; i++) {
if (psm->stat[i] == 0) {
psm->next_alloc = i + 1;
return (uint16_t)i;
}
}
for (i = ALLOC_PORT_START; i < psm->next_alloc; i++) {
if (psm->stat[i] == 0) {
psm->next_alloc = i + 1;
return (uint16_t)i;
}
}
return 0;
}
static inline uint16_t
tle_psm_alloc_dual_port(struct tle_psm *psm4, struct tle_psm *psm6)
{
uint32_t i = psm6->next_alloc;
for (; i < MAX_PORT_NUM; i++) {
if (psm6->stat[i] == 0 && psm4->stat[i] == 0) {
psm6->next_alloc = i + 1;
return (uint16_t)i;
}
}
for (i = ALLOC_PORT_START; i < psm6->next_alloc; i++) {
if (psm6->stat[i] == 0 && psm4->stat[i] == 0) {
psm6->next_alloc = i + 1;
return (uint16_t)i;
}
}
return 0;
}
#ifdef __cplusplus
}
#endif
#endif /* _PORT_STATMAP_H_ */
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