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components/lwip/arp: change the arp dropping packet function

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LWIP will drop the oldest package at the arp packet cache queue and return "ERR_OK"
We change it that ARP level will drop the current packet and return "ERR_MEM" to tell user that you should send the packet again latter.
This commit is contained in:
tianzhongxing 2016-11-21 14:09:52 +08:00
parent 311a4cd678
commit cc39b7b286
2 changed files with 18 additions and 0 deletions
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1
components/lwip/include/lwip/port/lwipopts.h
View File

@ -515,6 +515,7 @@ extern unsigned long os_random(void);
/* Enable all Espressif-only options */
#define ESP_LWIP 1
#define ESP_LWIP_ARP 1
#define ESP_PER_SOC_TCP_WND 1
#define ESP_THREAD_SAFE 1
#define ESP_THREAD_SAFE_DEBUG LWIP_DBG_OFF

17
components/lwip/netif/etharp.c
View File

@ -1192,11 +1192,28 @@ etharp_query(struct netif *netif, const ip4_addr_t *ipaddr, struct pbuf *q)
}
#if ARP_QUEUE_LEN
if (qlen >= ARP_QUEUE_LEN) {
#if ESP_LWIP_ARP
int l;
struct etharp_q_entry *r;
l = qlen - 1;
r = arp_table[i].q;
while (l--)
r = r->next;
r->next = NULL;
pbuf_free(new_entry->p);
memp_free(MEMP_ARP_QUEUE, new_entry);
LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not queue the packet %p (queue is full)\n", (void *)q));
return ERR_MEM;
#else
struct etharp_q_entry *old;
old = arp_table[i].q;
arp_table[i].q = arp_table[i].q->next;
pbuf_free(old->p);
memp_free(MEMP_ARP_QUEUE, old);
#endif
}
#endif
LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));