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bgpd: fix label allocation should not be allocated at startup

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BGP always asks zebra for a chunk of MPLS label even if it doesn't need it.
Fix this by correcting the rounding up "labels_needed" formula.

Fixes: 80853c2ec7 ("bgpd: improve labelpool performance at scale")
Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
This commit is contained in:
Philippe Guibert 2023-09-01 17:51:54 +02:00
parent d162d5f6f5
commit cb86d8e3a4
2 changed files with 8 additions and 4 deletions
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10
bgpd/bgp_labelpool.c
View File

@ -642,7 +642,11 @@ void bgp_lp_event_zebra_up(void)
}
/* round up */
chunks_needed = (labels_needed / lp->next_chunksize) + 1;
if (((float)labels_needed / (float)lp->next_chunksize) >
(labels_needed / lp->next_chunksize))
chunks_needed = (labels_needed / lp->next_chunksize) + 1;
else
chunks_needed = (labels_needed / lp->next_chunksize);
labels_needed = chunks_needed * lp->next_chunksize;
/*
@ -650,8 +654,8 @@ void bgp_lp_event_zebra_up(void)
*/
list_delete_all_node(lp->chunks);
if (!bgp_zebra_request_label_range(MPLS_LABEL_BASE_ANY, labels_needed,
true))
if (labels_needed && !bgp_zebra_request_label_range(MPLS_LABEL_BASE_ANY,
labels_needed, true))
return;
lp->pending_count = labels_needed;

2
tests/topotests/bgp_lu_topo1/R2/labelpool.summ.json
View File

@ -2,5 +2,5 @@
"ledger":0,
"inUse":0,
"requests":0,
"labelChunks":1
"labelChunks":0
}