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ospfd: use a new vertex list for every SPF run

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In the context of TI-LFA it is necessary to have multiple
representations of SPFs for so called P and Q spaces. Hence it makes
sense to start with fresh vertex lists, and only delete them when
the SPF calculation is not a 'dry run'.

Signed-off-by: GalaxyGorilla <sascha@netdef.org>
This commit is contained in:
GalaxyGorilla 2020-08-25 14:13:08 +00:00
parent 4519ba13f9
commit 81443a283b
3 changed files with 30 additions and 25 deletions
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52
ospfd/ospf_spf.c
View File

@ -68,12 +68,6 @@ static void ospf_spf_set_reason(ospf_spf_reason_t reason)
}
static void ospf_vertex_free(void *);
/*
* List of allocated vertices, to simplify cleanup of SPF.
* Not thread-safe obviously. If it ever needs to be, it'd have to be
* dynamically allocated at begin of ospf_spf_calculate
*/
static struct list vertex_list = {.del = ospf_vertex_free};
/*
* Heap related functions, for the managment of the candidates, to
@ -184,7 +178,8 @@ static int vertex_parent_cmp(void *aa, void *bb)
return IPV4_ADDR_CMP(&a->nexthop->router, &b->nexthop->router);
}
static struct vertex *ospf_vertex_new(struct ospf_lsa *lsa)
static struct vertex *ospf_vertex_new(struct ospf_area *area,
struct ospf_lsa *lsa)
{
struct vertex *new;
@ -202,7 +197,7 @@ static struct vertex *ospf_vertex_new(struct ospf_lsa *lsa)
lsa->stat = new;
listnode_add(&vertex_list, new);
listnode_add(area->spf_vertex_list, new);
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("%s: Created %s vertex %s", __func__,
@ -292,12 +287,18 @@ static void ospf_vertex_add_parent(struct vertex *v)
static void ospf_spf_init(struct ospf_area *area, struct ospf_lsa *root_lsa,
bool is_dry_run, bool is_root_node)
{
struct list *vertex_list;
struct vertex *v;
/* Create root node. */
v = ospf_vertex_new(root_lsa);
/* Create vertex list */
vertex_list = list_new();
vertex_list->del = ospf_vertex_free;
area->spf_vertex_list = vertex_list;
/* Create root node. */
v = ospf_vertex_new(area, root_lsa);
area->spf = v;
area->spf_dry_run = is_dry_run;
area->spf_root_node = is_root_node;
@ -956,7 +957,7 @@ static void ospf_spf_next(struct vertex *v, struct ospf_area *area,
/* Is there already vertex W in candidate list? */
if (w_lsa->stat == LSA_SPF_NOT_EXPLORED) {
/* prepare vertex W. */
w = ospf_vertex_new(w_lsa);
w = ospf_vertex_new(area, w_lsa);
/* Calculate nexthop to W. */
if (ospf_nexthop_calculation(area, v, w, l, distance,
@ -1146,6 +1147,19 @@ void ospf_rtrs_free(struct route_table *rtrs)
route_table_finish(rtrs);
}
void ospf_spf_cleanup(struct vertex *spf, struct list *vertex_list)
{
/*
* Free nexthop information, canonical versions of which are
* attached the first level of router vertices attached to the
* root vertex, see ospf_nexthop_calculation.
*/
ospf_canonical_nexthops_free(spf);
/* Free SPF vertices list with deconstructor ospf_vertex_free. */
list_delete(&vertex_list);
}
#if 0
static void
ospf_rtrs_print (struct route_table *rtrs)
@ -1311,20 +1325,8 @@ void ospf_spf_calculate(struct ospf_area *area, struct ospf_lsa *root_lsa,
mtype_stats_alloc(MTYPE_OSPF_VERTEX));
/* If this is a dry run then keep the SPF data in place */
if (!area->spf_dry_run) {
/*
* Free nexthop information, canonical versions of which are
* attached the first level of router vertices attached to the
* root vertex, see ospf_nexthop_calculation.
*/
ospf_canonical_nexthops_free(area->spf);
/*
* Free SPF vertices, but not the list. List has
* ospf_vertex_free as deconstructor.
*/
list_delete_all_node(&vertex_list);
}
if (!area->spf_dry_run)
ospf_spf_cleanup(area->spf, area->spf_vertex_list);
}
int ospf_spf_calculate_areas(struct ospf *ospf, struct route_table *new_table,

1
ospfd/ospf_spf.h
View File

@ -82,6 +82,7 @@ extern int ospf_spf_calculate_areas(struct ospf *ospf,
struct route_table *new_rtrs,
bool is_dry_run, bool is_root_node);
extern void ospf_rtrs_free(struct route_table *);
extern void ospf_spf_cleanup(struct vertex *spf, struct list *vertex_list);
extern void ospf_spf_print(struct vty *vty, struct vertex *v, int i);

2
ospfd/ospfd.h
View File

@ -414,6 +414,8 @@ struct ospf_area {
/* Shortest Path Tree. */
struct vertex *spf;
struct list *spf_vertex_list;
bool spf_dry_run; /* flag for checking if the SPF calculation is
intended for the local RIB */
bool spf_root_node; /* flag for checking if the calculating node is the