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zebra: Refactor nexthop resolution in active funcs

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Refactor/move around the code for nexthop resolution so
that it occurs only when the nexthop actually changes. Further,
provide a helper function to make the code more readable.

Also, remove the check for NEXTHOPS_CHANGED as this flag is used
specifcially for nexthop tracking and not an appropriate check
here.

Signed-off-by: Stephen Worley <sworley@cumulusnetworks.com>
This commit is contained in:
Stephen Worley 2019-07-02 01:37:17 -04:00
parent 2f00094498
commit df31a989ca
1 changed files with 76 additions and 65 deletions
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141
zebra/zebra_nhg.c
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@ -918,6 +918,48 @@ static bool nexthop_valid_resolve(const struct nexthop *nexthop,
return true;
}
static bool zebra_nhg_set_resolved(struct nhg_hash_entry *nhe,
struct nhg_hash_entry *resolved)
{
bool new = true;
struct nhg_hash_entry *old_resolved = NULL;
struct nexthop *nh = NULL;
assert(!CHECK_FLAG(resolved->flags, NEXTHOP_GROUP_RECURSIVE));
/* If this was already resolved, get its resolved nhe */
if (CHECK_FLAG(nhe->flags, NEXTHOP_GROUP_RECURSIVE))
old_resolved = zebra_nhg_resolve(nhe);
/*
* We are going to do what is done in nexthop_active
* and clear whatever resolved nexthop may already be
* there.
*/
zebra_nhg_depends_release(nhe);
nhg_connected_head_free(&nhe->nhg_depends);
/* Add new resolved */
zebra_nhg_depends_add(nhe, resolved);
zebra_nhg_dependents_add(resolved, nhe);
if (old_resolved && resolved->id != old_resolved->id) {
resolved->refcnt += nhe->refcnt;
old_resolved->refcnt -= nhe->refcnt;
} else if (!old_resolved)
zebra_nhg_increment_ref(resolved);
else
new = false; /* Same one that was there */
for (nh = resolved->nhg->nexthop; nh; nh = nh->next)
nexthop_set_resolved(nhe->afi, nhe->nhg->nexthop, nh);
SET_FLAG(nhe->flags, NEXTHOP_GROUP_RECURSIVE);
return new;
}
/*
* Given a nexthop we need to properly recursively resolve
* the route. As such, do a table lookup to find and match
@ -926,7 +968,7 @@ static bool nexthop_valid_resolve(const struct nexthop *nexthop,
*/
static int nexthop_active(afi_t afi, struct route_entry *re,
struct nexthop *nexthop, struct route_node *top,
uint32_t *resolved_id)
struct nhg_hash_entry **resolved_nhe)
{
struct prefix p;
struct route_table *table;
@ -1102,7 +1144,9 @@ static int nexthop_active(afi_t afi, struct route_entry *re,
}
if (resolved) {
re->nexthop_mtu = match->mtu;
*resolved_id = match->nhe_id;
zebra_nhg_find_nexthop(resolved_nhe, 0,
nexthop->resolved, afi,
false);
}
if (!resolved && IS_ZEBRA_DEBUG_RIB_DETAILED)
zlog_debug("\t%s: Recursion failed to find",
@ -1124,7 +1168,9 @@ static int nexthop_active(afi_t afi, struct route_entry *re,
}
if (resolved) {
re->nexthop_mtu = match->mtu;
*resolved_id = match->nhe_id;
zebra_nhg_find_nexthop(resolved_nhe, 0,
nexthop->resolved, afi,
false);
}
if (!resolved && IS_ZEBRA_DEBUG_RIB_DETAILED)
zlog_debug(
@ -1165,7 +1211,7 @@ static int nexthop_active(afi_t afi, struct route_entry *re,
static unsigned nexthop_active_check(struct route_node *rn,
struct route_entry *re,
struct nexthop *nexthop,
uint32_t *resolved_id)
struct nhg_hash_entry **resolved_nhe)
{
struct interface *ifp;
route_map_result_t ret = RMAP_PERMITMATCH;
@ -1193,14 +1239,14 @@ static unsigned nexthop_active_check(struct route_node *rn,
case NEXTHOP_TYPE_IPV4:
case NEXTHOP_TYPE_IPV4_IFINDEX:
family = AFI_IP;
if (nexthop_active(AFI_IP, re, nexthop, rn, resolved_id))
if (nexthop_active(AFI_IP, re, nexthop, rn, resolved_nhe))
SET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
else
UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
break;
case NEXTHOP_TYPE_IPV6:
family = AFI_IP6;
if (nexthop_active(AFI_IP6, re, nexthop, rn, resolved_id))
if (nexthop_active(AFI_IP6, re, nexthop, rn, resolved_nhe))
SET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
else
UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
@ -1218,7 +1264,7 @@ static unsigned nexthop_active_check(struct route_node *rn,
UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
} else {
if (nexthop_active(AFI_IP6, re, nexthop, rn,
resolved_id))
resolved_nhe))
SET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
else
UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
@ -1298,6 +1344,7 @@ int nexthop_active_update(struct route_node *rn, struct route_entry *re)
unsigned int prev_active, new_active;
ifindex_t prev_index;
uint8_t curr_active = 0;
bool new_resolve = false;
afi_t rt_afi = family2afi(rn->p.family);
@ -1308,7 +1355,7 @@ int nexthop_active_update(struct route_node *rn, struct route_entry *re)
for (nexthop = new_grp.nexthop; nexthop; nexthop = nexthop->next) {
struct nhg_hash_entry *nhe = NULL;
uint32_t resolved_id = 0;
struct nhg_hash_entry *resolved_nhe = NULL;
/* No protocol daemon provides src and so we're skipping
* tracking it */
@ -1322,52 +1369,7 @@ int nexthop_active_update(struct route_node *rn, struct route_entry *re)
* decision point.
*/
new_active =
nexthop_active_check(rn, re, nexthop, &resolved_id);
/*
* Create the individual nexthop hash entries
* for the nexthops in the group
*/
nhe = depends_find(nexthop, rt_afi);
if (nhe && resolved_id) {
struct nhg_hash_entry *old_resolved = NULL;
struct nhg_hash_entry *new_resolved = NULL;
/* If this was already resolved, get its resolved nhe */
if (CHECK_FLAG(nhe->flags, NEXTHOP_GROUP_RECURSIVE))
old_resolved = zebra_nhg_resolve(nhe);
/*
* We are going to do what is done in nexthop_active
* and clear whatever resolved nexthop may already be
* there.
*/
zebra_nhg_depends_release(nhe);
nhg_connected_head_free(&nhe->nhg_depends);
new_resolved = zebra_nhg_lookup_id(resolved_id);
if (new_resolved) {
/* Add new resolved */
zebra_nhg_depends_add(nhe, new_resolved);
zebra_nhg_dependents_add(new_resolved, nhe);
if (old_resolved && new_resolved->id != old_resolved->id) {
new_resolved->refcnt+=nhe->refcnt;
old_resolved->refcnt-=nhe->refcnt;
} else if (!old_resolved)
zebra_nhg_increment_ref(new_resolved);
SET_FLAG(nhe->flags, NEXTHOP_GROUP_RECURSIVE);
} else
flog_err(
EC_ZEBRA_TABLE_LOOKUP_FAILED,
"Zebra failed to lookup a resolved nexthop hash entry id=%u",
resolved_id);
}
nexthop_active_check(rn, re, nexthop, &resolved_nhe);
if (new_active
&& nexthop_group_active_nexthop_num(&new_grp)
@ -1376,15 +1378,9 @@ int nexthop_active_update(struct route_node *rn, struct route_entry *re)
new_active = 0;
}
if (nhe && new_active) {
if (new_active)
curr_active++;
SET_FLAG(nhe->flags, NEXTHOP_GROUP_VALID);
if (!nhe->is_kernel_nh
&& !CHECK_FLAG(nhe->flags, NEXTHOP_GROUP_RECURSIVE))
zebra_nhg_install_kernel(nhe);
}
/* Don't allow src setting on IPv6 addr for now */
if (prev_active != new_active || prev_index != nexthop->ifindex
|| ((nexthop->type >= NEXTHOP_TYPE_IFINDEX
@ -1395,11 +1391,26 @@ int nexthop_active_update(struct route_node *rn, struct route_entry *re)
&& nexthop->type < NEXTHOP_TYPE_BLACKHOLE)
&& !(IPV6_ADDR_SAME(&prev_src.ipv6,
&nexthop->rmap_src.ipv6)))
|| CHECK_FLAG(re->status, ROUTE_ENTRY_LABELS_CHANGED))
|| CHECK_FLAG(re->status, ROUTE_ENTRY_LABELS_CHANGED)) {
SET_FLAG(re->status, ROUTE_ENTRY_CHANGED);
/*
* Create the individual nexthop hash entries
* for the nexthops in the group
*/
nhe = depends_find(nexthop, rt_afi);
if (resolved_nhe)
new_resolve = zebra_nhg_set_resolved(
nhe, resolved_nhe);
if (nhe && new_active)
SET_FLAG(nhe->flags, NEXTHOP_GROUP_VALID);
}
}
if (CHECK_FLAG(re->status, ROUTE_ENTRY_NEXTHOPS_CHANGED)) {
if (CHECK_FLAG(re->status, ROUTE_ENTRY_CHANGED) || new_resolve) {
struct nhg_hash_entry *new_nhe = NULL;
// TODO: Add proto type here
@ -1477,8 +1488,8 @@ uint8_t zebra_nhg_nhe2grp(struct nh_grp *grp, struct nhg_hash_entry *nhe)
if (!depend) {
flog_err(
EC_ZEBRA_NHG_FIB_UPDATE,
"Failed to recursively resolve Nexthop Hash Entry id=%u in the group id=%u",
depend->id, nhe->id);
"Failed to recursively resolve Nexthop Hash Entry in the group id=%u",
nhe->id);
continue;
}
}