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zebra: Improve commenting for group requeue case

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The commenting for why we would need to requeue a
group from the kernel to be later processed was not
sufficient. Add a better explanation for the flow
and state of the system.

Signed-off-by: Stephen Worley <sworley@cumulusnetworks.com>
This commit is contained in:
Stephen Worley 2019-10-23 15:07:22 -04:00
parent c1da832a94
commit e1292378e2
1 changed files with 10 additions and 3 deletions
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13
zebra/zebra_nhg.c
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@ -883,10 +883,17 @@ int nhg_ctx_process(struct nhg_ctx *ctx)
ret = nhg_ctx_process_new(ctx);
if (nhg_ctx_get_count(ctx) && ret == -ENOENT
&& nhg_ctx_get_status(ctx) != NHG_CTX_REQUEUED) {
/* Depends probably came before group, re-queue.
/**
* We have entered a situation where we are
* processing a group from the kernel
* that has a contained nexthop which
* we have not yet processed.
*
* Only going to retry once, hence just using status
* flag rather than counter.
* Re-enqueue this ctx to be handled exactly one
* more time (indicated by the flag).
*
* By the time we get back to it, we
* should have processed its depends.
*/
nhg_ctx_set_status(ctx, NHG_CTX_NONE);
if (queue_add(ctx) == 0) {