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libalias: Restructure - Separate fully qualified search

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Search fully specified links first.  Some performance loss due to need
to revisit the db twice, if not found.

MFC after:	1 week
Differential Revision: https://reviews.freebsd.org/D30569
This commit is contained in:
Lutz Donnerhacke 2021-05-25 15:44:34 +02:00
parent 3386347f65
commit 32f9c2ceb3
1 changed files with 17 additions and 12 deletions
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29
sys/netinet/libalias/alias_db.c
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@ -1210,18 +1210,27 @@ _FindLinkIn(struct libalias *la, struct in_addr dst_addr,
/* Search loop */
start_point = StartPointIn(alias_addr, alias_port, link_type);
if (!(flags_in & LINK_PARTIALLY_SPECIFIED)) {
LIST_FOREACH(lnk, &la->linkTableIn[start_point], list_in) {
INGUARD;
if (lnk->flags & LINK_PARTIALLY_SPECIFIED)
continue;
if (lnk->dst_addr.s_addr == dst_addr.s_addr
&& lnk->dst_port == dst_port) {
CleanupLink(la, &lnk);
if (lnk != NULL) {
lnk->timestamp = LibAliasTime;
return (lnk);
}
}
}
}
LIST_FOREACH(lnk, &la->linkTableIn[start_point], list_in) {
int flags;
INGUARD;
flags = flags_in | lnk->flags;
if (!(flags & LINK_PARTIALLY_SPECIFIED)) {
if (lnk->dst_addr.s_addr == dst_addr.s_addr
&& lnk->dst_port == dst_port) {
lnk_fully_specified = lnk;
break;
}
} else if ((flags & LINK_UNKNOWN_DEST_ADDR)
if ((flags & LINK_UNKNOWN_DEST_ADDR)
&& (flags & LINK_UNKNOWN_DEST_PORT)) {
if (lnk_unknown_all == NULL)
lnk_unknown_all = lnk;
@ -1239,11 +1248,7 @@ _FindLinkIn(struct libalias *la, struct in_addr dst_addr,
}
#undef INGUARD
CleanupLink(la, &lnk_fully_specified);
if (lnk_fully_specified != NULL) {
lnk_fully_specified->timestamp = LibAliasTime;
lnk = lnk_fully_specified;
} else if (lnk_unknown_dst_port != NULL)
if (lnk_unknown_dst_port != NULL)
lnk = lnk_unknown_dst_port;
else if (lnk_unknown_dst_addr != NULL)
lnk = lnk_unknown_dst_addr;