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ldpd: use red-black trees to store 'l2vpn_if' elements

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Using red-black trees instead of linked lists brings the following
benefits:
1 - Elements are naturally ordered (no need to reorder anything before
    outputting data to the user);
2 - Faster lookups/deletes: O(log n) time complexity against O(n).

The insert operation with red-black trees is more expensive though,
but that's not a big issue since lookups are much more frequent.

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>
This commit is contained in:
Renato Westphal 2016-12-14 12:34:57 -02:00
parent 2db4e1fca1
commit 7a09a2b1c4
6 changed files with 44 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
ldpd/l2vpn.c
View File

@ -28,8 +28,10 @@
static void l2vpn_pw_fec(struct l2vpn_pw *, struct fec *);
static __inline int l2vpn_compare(struct l2vpn *, struct l2vpn *);
static __inline int l2vpn_if_compare(struct l2vpn_if *, struct l2vpn_if *);
RB_GENERATE(l2vpn_head, l2vpn, entry, l2vpn_compare)
RB_GENERATE(l2vpn_if_head, l2vpn_if, entry, l2vpn_if_compare)
static __inline int
l2vpn_compare(struct l2vpn *a, struct l2vpn *b)
@ -51,7 +53,7 @@ l2vpn_new(const char *name)
l2vpn->mtu = DEFAULT_L2VPN_MTU;
l2vpn->pw_type = DEFAULT_PW_TYPE;
LIST_INIT(&l2vpn->if_list);
RB_INIT(&l2vpn->if_tree);
LIST_INIT(&l2vpn->pw_list);
LIST_INIT(&l2vpn->pw_inactive_list);
@ -72,8 +74,8 @@ l2vpn_del(struct l2vpn *l2vpn)
struct l2vpn_if *lif;
struct l2vpn_pw *pw;
while ((lif = LIST_FIRST(&l2vpn->if_list)) != NULL) {
LIST_REMOVE(lif, entry);
while ((lif = RB_ROOT(&l2vpn->if_tree)) != NULL) {
RB_REMOVE(l2vpn_if_head, &l2vpn->if_tree, lif);
free(lif);
}
while ((pw = LIST_FIRST(&l2vpn->pw_list)) != NULL) {
@ -106,6 +108,12 @@ l2vpn_exit(struct l2vpn *l2vpn)
l2vpn_pw_exit(pw);
}
static __inline int
l2vpn_if_compare(struct l2vpn_if *a, struct l2vpn_if *b)
{
return (strcmp(a->ifname, b->ifname));
}
struct l2vpn_if *
l2vpn_if_new(struct l2vpn *l2vpn, struct kif *kif)
{
@ -127,7 +135,7 @@ l2vpn_if_find(struct l2vpn *l2vpn, unsigned int ifindex)
{
struct l2vpn_if *lif;
LIST_FOREACH(lif, &l2vpn->if_list, entry)
RB_FOREACH(lif, l2vpn_if_head, &l2vpn->if_tree)
if (lif->ifindex == ifindex)
return (lif);
@ -137,13 +145,9 @@ l2vpn_if_find(struct l2vpn *l2vpn, unsigned int ifindex)
struct l2vpn_if *
l2vpn_if_find_name(struct l2vpn *l2vpn, const char *ifname)
{
struct l2vpn_if *lif;
LIST_FOREACH(lif, &l2vpn->if_list, entry)
if (strcmp(lif->ifname, ifname) == 0)
return (lif);
return (NULL);
struct l2vpn_if lif;
strlcpy(lif.ifname, ifname, sizeof(lif.ifname));
return (RB_FIND(l2vpn_if_head, &l2vpn->if_tree, &lif));
}

4
ldpd/lde.c
View File

@ -509,7 +509,7 @@ lde_dispatch_parent(struct thread *thread)
fatal(NULL);
memcpy(nl2vpn, imsg.data, sizeof(struct l2vpn));
LIST_INIT(&nl2vpn->if_list);
RB_INIT(&nl2vpn->if_tree);
LIST_INIT(&nl2vpn->pw_list);
LIST_INIT(&nl2vpn->pw_inactive_list);
@ -521,7 +521,7 @@ lde_dispatch_parent(struct thread *thread)
memcpy(nlif, imsg.data, sizeof(struct l2vpn_if));
nlif->l2vpn = nl2vpn;
LIST_INSERT_HEAD(&nl2vpn->if_list, nlif, entry);
RB_INSERT(l2vpn_if_head, &nl2vpn->if_tree, nlif);
break;
case IMSG_RECONF_L2VPN_PW:
if ((npw = malloc(sizeof(struct l2vpn_pw))) == NULL)

16
ldpd/ldp_vty_conf.c
View File

@ -354,7 +354,7 @@ ldp_l2vpn_config_write(struct vty *vty)
vty_out(vty, " bridge %s%s", l2vpn->br_ifname,
VTY_NEWLINE);
LIST_FOREACH(lif, &l2vpn->if_list, entry)
RB_FOREACH(lif, l2vpn_if_head, &l2vpn->if_tree)
vty_out(vty, " member interface %s%s", lif->ifname,
VTY_NEWLINE);
@ -1369,7 +1369,7 @@ ldp_vty_l2vpn_interface(struct vty *vty, struct vty_arg *args[])
if (lif == NULL)
goto cancel;
LIST_REMOVE(lif, entry);
RB_REMOVE(l2vpn_if_head, &l2vpn->if_tree, lif);
free(lif);
ldp_reload(vty_conf);
return (CMD_SUCCESS);
@ -1392,7 +1392,7 @@ ldp_vty_l2vpn_interface(struct vty *vty, struct vty_arg *args[])
}
lif = l2vpn_if_new(l2vpn, &kif);
LIST_INSERT_HEAD(&l2vpn->if_list, lif, entry);
RB_INSERT(l2vpn_if_head, &l2vpn->if_tree, lif);
ldp_reload_ref(vty_conf, (void **)&l2vpn);
@ -1723,8 +1723,8 @@ l2vpn_del_api(struct ldpd_conf *conf, struct l2vpn *l2vpn)
struct l2vpn_if *lif;
struct l2vpn_pw *pw;
while ((lif = LIST_FIRST(&l2vpn->if_list)) != NULL) {
LIST_REMOVE(lif, entry);
while ((lif = RB_ROOT(&l2vpn->if_tree)) != NULL) {
RB_REMOVE(l2vpn_if_head, &l2vpn->if_tree, lif);
free(lif);
}
while ((pw = LIST_FIRST(&l2vpn->pw_list)) != NULL) {
@ -1759,14 +1759,14 @@ l2vpn_if_new_api(struct ldpd_conf *conf, struct l2vpn *l2vpn,
}
lif = l2vpn_if_new(l2vpn, &kif);
LIST_INSERT_HEAD(&l2vpn->if_list, lif, entry);
RB_INSERT(l2vpn_if_head, &l2vpn->if_tree, lif);
return (lif);
}
void
l2vpn_if_del_api(struct l2vpn_if *lif)
l2vpn_if_del_api(struct l2vpn *l2vpn, struct l2vpn_if *lif)
{
LIST_REMOVE(lif, entry);
RB_REMOVE(l2vpn_if_head, &l2vpn->if_tree, lif);
free(lif);
}

22
ldpd/ldpd.c
View File

@ -914,7 +914,7 @@ main_imsg_send_config(struct ldpd_conf *xconf)
sizeof(*l2vpn)) == -1)
return (-1);
LIST_FOREACH(lif, &l2vpn->if_list, entry) {
RB_FOREACH(lif, l2vpn_if_head, &l2vpn->if_tree) {
if (main_imsg_compose_both(IMSG_RECONF_L2VPN_IF, lif,
sizeof(*lif)) == -1)
return (-1);
@ -1094,15 +1094,15 @@ ldp_dup_config_ref(struct ldpd_conf *conf, void **ref)
}
RB_FOREACH(l2vpn, l2vpn_head, &conf->l2vpn_tree) {
COPY(xl, l2vpn);
LIST_INIT(&xl->if_list);
RB_INIT(&xl->if_tree);
LIST_INIT(&xl->pw_list);
LIST_INIT(&xl->pw_inactive_list);
RB_INSERT(l2vpn_head, &xconf->l2vpn_tree, xl);
LIST_FOREACH(lif, &l2vpn->if_list, entry) {
RB_FOREACH(lif, l2vpn_if_head, &l2vpn->if_tree) {
COPY(xf, lif);
xf->l2vpn = xl;
LIST_INSERT_HEAD(&xl->if_list, xf, entry);
RB_INSERT(l2vpn_if_head, &xl->if_tree, xf);
}
LIST_FOREACH(pw, &l2vpn->pw_list, entry) {
COPY(xp, pw);
@ -1523,7 +1523,7 @@ merge_l2vpns(struct ldpd_conf *conf, struct ldpd_conf *xconf, void **ref)
ldpe_l2vpn_exit(l2vpn);
break;
case PROC_MAIN:
LIST_FOREACH(lif, &l2vpn->if_list, entry)
RB_FOREACH(lif, l2vpn_if_head, &l2vpn->if_tree)
QOBJ_UNREG (lif);
LIST_FOREACH(pw, &l2vpn->pw_list, entry)
QOBJ_UNREG (pw);
@ -1578,27 +1578,27 @@ merge_l2vpn(struct ldpd_conf *xconf, struct l2vpn *l2vpn, struct l2vpn *xl, void
previous_mtu = l2vpn->mtu;
/* merge intefaces */
LIST_FOREACH_SAFE(lif, &l2vpn->if_list, entry, ftmp) {
RB_FOREACH_SAFE(lif, l2vpn_if_head, &l2vpn->if_tree, ftmp) {
/* find deleted interfaces */
if ((xf = l2vpn_if_find_name(xl, lif->ifname)) == NULL) {
if (ldpd_process == PROC_MAIN)
QOBJ_UNREG (lif);
LIST_REMOVE(lif, entry);
RB_REMOVE(l2vpn_if_head, &l2vpn->if_tree, lif);
free(lif);
}
}
LIST_FOREACH_SAFE(xf, &xl->if_list, entry, ftmp) {
RB_FOREACH_SAFE(xf, l2vpn_if_head, &xl->if_tree, ftmp) {
/* find new interfaces */
if ((lif = l2vpn_if_find_name(l2vpn, xf->ifname)) == NULL) {
LIST_REMOVE(xf, entry);
LIST_INSERT_HEAD(&l2vpn->if_list, xf, entry);
RB_REMOVE(l2vpn_if_head, &xl->if_tree, xf);
RB_INSERT(l2vpn_if_head, &l2vpn->if_tree, xf);
xf->l2vpn = l2vpn;
if (ldpd_process == PROC_MAIN)
QOBJ_REG (xf, l2vpn_if);
continue;
}
LIST_REMOVE(xf, entry);
RB_REMOVE(l2vpn_if_head, &xl->if_tree, xf);
if (ref && *ref == xf)
*ref = lif;
free(xf);

9
ldpd/ldpd.h
View File

@ -325,13 +325,15 @@ DECLARE_QOBJ_TYPE(nbr_params)
#define F_NBRP_GTSM_HOPS 0x04
struct l2vpn_if {
LIST_ENTRY(l2vpn_if) entry;
RB_ENTRY(l2vpn_if) entry;
struct l2vpn *l2vpn;
char ifname[IF_NAMESIZE];
unsigned int ifindex;
uint16_t flags;
QOBJ_FIELDS
};
RB_HEAD(l2vpn_if_head, l2vpn_if);
RB_PROTOTYPE(l2vpn_if_head, l2vpn_if, entry, l2vpn_if_compare);
DECLARE_QOBJ_TYPE(l2vpn_if)
struct l2vpn_pw {
@ -365,7 +367,7 @@ struct l2vpn {
int mtu;
char br_ifname[IF_NAMESIZE];
unsigned int br_ifindex;
LIST_HEAD(, l2vpn_if) if_list;
struct l2vpn_if_head if_tree;
LIST_HEAD(, l2vpn_pw) pw_list;
LIST_HEAD(, l2vpn_pw) pw_inactive_list;
QOBJ_FIELDS
@ -651,7 +653,8 @@ void l2vpn_del_api(struct ldpd_conf *conf,
struct l2vpn *l2vpn);
struct l2vpn_if *l2vpn_if_new_api(struct ldpd_conf *conf,
struct l2vpn *l2vpn, const char *ifname);
void l2vpn_if_del_api(struct l2vpn_if *lif);
void l2vpn_if_del_api(struct l2vpn *l2vpn,
struct l2vpn_if *lif);
struct l2vpn_pw *l2vpn_pw_new_api(struct ldpd_conf *conf,
struct l2vpn *l2vpn, const char *ifname);
void l2vpn_pw_del_api(struct l2vpn_pw *pw);

4
ldpd/ldpe.c
View File

@ -452,7 +452,7 @@ ldpe_dispatch_main(struct thread *thread)
fatal(NULL);
memcpy(nl2vpn, imsg.data, sizeof(struct l2vpn));
LIST_INIT(&nl2vpn->if_list);
RB_INIT(&nl2vpn->if_tree);
LIST_INIT(&nl2vpn->pw_list);
LIST_INIT(&nl2vpn->pw_inactive_list);
@ -464,7 +464,7 @@ ldpe_dispatch_main(struct thread *thread)
memcpy(nlif, imsg.data, sizeof(struct l2vpn_if));
nlif->l2vpn = nl2vpn;
LIST_INSERT_HEAD(&nl2vpn->if_list, nlif, entry);
RB_INSERT(l2vpn_if_head, &nl2vpn->if_tree, nlif);
break;
case IMSG_RECONF_L2VPN_PW:
if ((npw = malloc(sizeof(struct l2vpn_pw))) == NULL)