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Introduced fast one-entry-cache to speed up ARP lookup when sending multiple packets to the same host.

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This commit is contained in:
goldsimon 2007-05-04 19:31:27 +00:00
parent 615e52d396
commit be316e81a7
2 changed files with 21 additions and 0 deletions
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4
CHANGELOG
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@ -23,6 +23,10 @@ HISTORY
++ New features:
2007-05-04 Simon Goldschmidt (Atte Kojo)
* etharp.c: Introduced fast one-entry-cache to speed up ARP lookup when sending
multiple packets to the same host.
2007-05-04 Frédéric Bernon, Jonathan Larmour
* sockets.c, api.h, api_lib.c, api_msg.h, api_msg.c: Fix bug #19162 "lwip_sento: a possible
to corrupt remote addr/port connection state". Reduce problems "not enought memory" with

17
src/netif/etharp.c
View File

@ -104,6 +104,7 @@ struct etharp_entry {
static const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
static struct etharp_entry arp_table[ARP_TABLE_SIZE];
static u8_t etharp_cached_entry = 0;
/**
* Try hard to create a new entry - we want the IP address to appear in
@ -232,6 +233,19 @@ static s8_t find_entry(struct ip_addr *ipaddr, u8_t flags)
u8_t age_queue = 0;
#endif
/* First, test if the last call to this function asked for the
* same address. If so, we're really fast! */
if (ipaddr) {
/* ipaddr to search for was given */
if (arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) {
/* the cached entry is stable */
if (ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr)) {
/* cached entry was the right one! */
return etharp_cached_entry;
}
}
}
/**
* a) do a search through the cache, remember candidates
* b) select candidate entry
@ -260,6 +274,7 @@ static s8_t find_entry(struct ip_addr *ipaddr, u8_t flags)
if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: found matching pending entry %"U16_F"\n", (u16_t)i));
/* found exact IP address match, simply bail out */
etharp_cached_entry = i;
return i;
#if ARP_QUEUEING
/* pending with queued packets? */
@ -283,6 +298,7 @@ static s8_t find_entry(struct ip_addr *ipaddr, u8_t flags)
if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: found matching stable entry %"U16_F"\n", (u16_t)i));
/* found exact IP address match, simply bail out */
etharp_cached_entry = i;
return i;
/* remember entry with oldest stable entry in oldest, its age in maxtime */
} else if (arp_table[i].ctime >= age_stable) {
@ -357,6 +373,7 @@ static s8_t find_entry(struct ip_addr *ipaddr, u8_t flags)
ip_addr_set(&arp_table[i].ipaddr, ipaddr);
}
arp_table[i].ctime = 0;
etharp_cached_entry = i;
return (err_t)i;
}