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tcp: Apply faster PCB recycling in FIN_WAIT_1 or FIN_WAIT_2 state

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This commit is contained in:
LiPeng
2023-12-20 11:37:41 +08:00
committed by David Čermák
parent 0c9c39a957
commit 3bfc85d29c
1 changed files with 30 additions and 4 deletions
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src/core/tcp.c
+30 -4
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@@ -1768,7 +1768,9 @@ tcp_kill_state(enum tcp_state state)
struct tcp_pcb *pcb, *inactive;
u32_t inactivity;
#if !ESP_LWIP
LWIP_ASSERT("invalid state", (state == CLOSING) || (state == LAST_ACK));
#endif
inactivity = 0;
inactive = NULL;
@@ -1873,17 +1875,41 @@ tcp_alloc(u8_t prio)
tcp_kill_state(CLOSING);
/* Try to allocate a tcp_pcb again. */
pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
#if ESP_LWIP
if (pcb == NULL) {
/* Try killing oldest active connection with lower priority than the new one. */
LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing oldest connection with prio lower than %d\n", prio));
tcp_kill_prio(prio);
/* Try to allocate a tcp_pcb again. */
/* Try killing oldest connection in FIN_WAIT_2. */
LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest FIN_WAIT_2 connection\n"));
tcp_kill_state(FIN_WAIT_2);
pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
if (pcb == NULL) {
/* Try killing oldest connection in FIN_WAIT_1. */
LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest FIN_WAIT_1 connection\n"));
tcp_kill_state(FIN_WAIT_1);
pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
#endif
if (pcb == NULL) {
/* Try killing oldest active connection with lower priority than the new one. */
LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing oldest connection with prio lower than %d\n", prio));
tcp_kill_prio(prio);
/* Try to allocate a tcp_pcb again. */
pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
if (pcb != NULL) {
/* adjust err stats: memp_malloc failed multiple times before */
MEMP_STATS_DEC(err, MEMP_TCP_PCB);
}
}
#if ESP_LWIP
if (pcb != NULL) {
/* adjust err stats: memp_malloc failed multiple times before */
MEMP_STATS_DEC(err, MEMP_TCP_PCB);
}
}
if (pcb != NULL) {
/* adjust err stats: memp_malloc failed multiple times before */
MEMP_STATS_DEC(err, MEMP_TCP_PCB);
}
}
#endif
if (pcb != NULL) {
/* adjust err stats: memp_malloc failed multiple times before */
MEMP_STATS_DEC(err, MEMP_TCP_PCB);