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Removed (late) sending of pbufs during dequeue.

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Pbufs should be sent from the queue once an ARP entry state goes from PENDING to STABLE.
Non-PENDING entries MUST NOT have queued packets (TODO).
This commit is contained in:
likewise 2003-11-18 00:53:54 +00:00
parent 94225531f8
commit 2c1cf05524
1 changed files with 37 additions and 19 deletions
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56
src/netif/etharp.c
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@ -129,7 +129,7 @@ static s8_t find_arp_entry(void);
static struct pbuf *update_arp_entry(struct netif *netif, struct ip_addr *ipaddr, struct eth_addr *ethaddr, u8_t flags);
#if ARP_QUEUEING
static struct pbuf *etharp_enqueue(s8_t i, struct pbuf *q);
static struct pbuf *etharp_dequeue(s8_t i);
static u8_t etharp_dequeue(s8_t i);
#endif
/**
* Initializes ARP module.
@ -231,10 +231,8 @@ find_arp_entry(void)
/* clean up the recycled stable entry */
if (arp_table[i].state == ETHARP_STATE_STABLE) {
#if ARP_QUEUEING
struct pbuf *q;
/* free packets on queue */
q = etharp_dequeue(i);
if (q != NULL) pbuf_free(q);
etharp_dequeue(i);
#endif
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("find_arp_entry: recycling oldest stable entry %u\n", i));
arp_table[i].state = ETHARP_STATE_EMPTY;
@ -245,25 +243,38 @@ find_arp_entry(void)
}
#if ARP_QUEUEING
/*
* Enqueues a pbuf (chain) on an ARP entry.
*
* Places the pbuf (chain) on the queue (if space allows). The
* caller may safely free the pbuf (chain) afterwards, as the
* pbufs will be referenced by the queue and copies are made of
* pbufs referencing external payloads.
*
* @ i the ARP entry index
* @arg q the pbuf (chain) to be queued on the ARP entry
*
* @return Returns the new head of queue of the ARP entry.
*
*/
static struct pbuf *
etharp_enqueue(s8_t i, struct pbuf *q)
{
/* any pbuf to queue? */
if (q != NULL) {
/* remove old packet on queue? */
/* queue later packet over earliers? TODO: Implement multiple pbuf queue */
#if ARP_QUEUE_FIRST == 0
struct pbuf *p;
p = etharp_dequeue(i);
if (p != NULL) pbuf_free(p);
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | 3, ("etharp_query: dropped packet %p on ARP queue. Should not occur.\n", (void *)arp_table[i].p));
/* remove any pbufs on queue */
u8_t deq = etharp_dequeue(i);
if (deq > 0) LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | 3, ("etharp_query: dequeued %u pbufs from ARP entry %u. Should not occur.\n", deq, i));
#endif
/* packet can be queued? */
/* packet can be queued? TODO: Implement multiple pbuf queue */
if (arp_table[i].p == NULL) {
/* copy PBUF_REF referenced payloads into PBUF_RAM */
/* copy any PBUF_REF referenced payloads into PBUF_RAM */
q = pbuf_take(q);
/* remember pbuf to queue, if any */
/* add pbuf to queue */
arp_table[i].p = q;
/* pbufs are queued, increase the reference count */
/* pbuf (chain) now queued, increase the reference count */
pbuf_ref(q);
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | DBG_STATE, ("etharp_query: queued packet %p on ARP entry %u.\n", (void *)q, i));
}
@ -271,18 +282,25 @@ etharp_enqueue(s8_t i, struct pbuf *q)
return arp_table[i].p;
}
static struct pbuf *
/**
* Dequeues any pbufs queued on an ARP entry
*
* @return number of pbufs removed from the queue
*
* TODO: decide what is a sensible return value?
*/
static u8_t
etharp_dequeue(s8_t i)
{
/* queued packets on a stable entry (work in progress) */
if (arp_table[i].p != NULL) {
/* send the queued IP packets */
netif->linkoutput(netif, arp_table[i].p);
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | 3,
("find_arp_entry: sent queued packet %p.\n", (void *)arp_table[i].p));
/* queue no longer references pbuf */
pbuf_free(arp_table[i].p);
arp_table[i].p = NULL;
return 1;
} else {
return 0;
}
return arp_table[i].p;
}
#endif