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zebra: add flag track released state of proto NHGS

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Add a flag to track the released state of a proto-based NHG.

This flag is used to know whether the upper level proto has called
the *_del API. Typically, the NHG would just get removed and uninstalled
at this point but there is a chance we are being sent it while routes
are still being owned or we were sent it multiple times. This flag
and associated code handles that.

Ticket: CM-30369

Signed-off-by: Stephen Worley <sworley@cumulusnetworks.com>
This commit is contained in:
Stephen Worley 2020-07-22 13:45:47 -04:00
parent 2053061bae
commit 8155e8c592
2 changed files with 33 additions and 3 deletions
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23
zebra/zebra_nhg.c
View File

@ -2794,6 +2794,17 @@ struct nhg_hash_entry *zebra_nhg_proto_add(uint32_t id, int type,
zebra_nhg_install_kernel(new);
if (old) {
/*
* Check to handle recving DEL while routes still in use then
* a replace.
*
* In this case we would have decremented the refcnt already
* but set the FLAG here. Go ahead and increment once to fix
* the misordering we have been sent.
*/
if (CHECK_FLAG(old->flags, NEXTHOP_GROUP_PROTO_RELEASED))
zebra_nhg_increment_ref(old);
rib_handle_nhg_replace(old, new);
/* if this != 1 at this point, we have a bug */
@ -2833,14 +2844,22 @@ struct nhg_hash_entry *zebra_nhg_proto_del(uint32_t id)
nhe = zebra_nhg_lookup_id(id);
if (!nhe) {
if (IS_ZEBRA_DEBUG_NHG_DETAIL)
if (IS_ZEBRA_DEBUG_NHG)
zlog_debug("%s: id %u, lookup failed", __func__, id);
return NULL;
}
if (CHECK_FLAG(nhe->flags, NEXTHOP_GROUP_PROTO_RELEASED)) {
if (IS_ZEBRA_DEBUG_NHG)
zlog_debug("%s: id %u, already released", __func__, id);
return NULL;
}
SET_FLAG(nhe->flags, NEXTHOP_GROUP_PROTO_RELEASED);
if (nhe->refcnt > 1) {
/* TODO: should be warn? */
if (IS_ZEBRA_DEBUG_NHG)
zlog_debug(
"%s: id %u, still being used by routes refcnt %u",

13
zebra/zebra_nhg.h
View File

@ -109,10 +109,21 @@ struct nhg_hash_entry {
*/
#define NEXTHOP_GROUP_BACKUP (1 << 4)
/*
* The NHG has been release by an upper level protocol via the
* `zebra_nhg_proto_del()` API.
*
* We use this flag to track this state in case the NHG is still being used
* by routes therefore holding their refcnts as well. Otherwise, the NHG will
* be removed and uninstalled.
*
*/
#define NEXTHOP_GROUP_PROTO_RELEASED (1 << 5)
/*
* Track FPM installation status..
*/
#define NEXTHOP_GROUP_FPM (1 << 5)
#define NEXTHOP_GROUP_FPM (1 << 6)
};
/* Was this one we created, either this session or previously? */