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vlib: fix handoff queue sequencing bug

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Set vm->check_frame_queues after actually enqueuing a frame. Under
obscure circumstances, the code managed to set check_frame_queues so
far in advance that 100 dispatch cycles could elapse before the frame
enqueue succeeded. That resulted in permanent lack of queue service.

Type: fix
Ticket: VPP-1734
Fixes: 18191

Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: If2d398202b4ba2b96581d25e8142daef3f74c9e5
This commit is contained in:
Dave Barach
2019-11-08 08:22:28 -05:00
committed by Damjan Marion
parent b3dce89a76
commit 320998a812
1 changed files with 2 additions and 1 deletions
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3
src/vlib/buffer_node.h
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@ -517,7 +517,6 @@ vlib_buffer_enqueue_to_thread (vlib_main_t * vm, u32 frame_queue_index,
n_drop++;
goto next;
}
vlib_mains[next_thread_index]->check_frame_queues = 1;
if (hf)
hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_thread;
@ -539,6 +538,7 @@ vlib_buffer_enqueue_to_thread (vlib_main_t * vm, u32 frame_queue_index,
{
hf->n_vectors = VLIB_FRAME_SIZE;
vlib_put_frame_queue_elt (hf);
vlib_mains[current_thread_index]->check_frame_queues = 1;
current_thread_index = ~0;
ptd->handoff_queue_elt_by_thread_index[next_thread_index] = 0;
hf = 0;
@ -567,6 +567,7 @@ vlib_buffer_enqueue_to_thread (vlib_main_t * vm, u32 frame_queue_index,
if (1 || hf->n_vectors == hf->last_n_vectors)
{
vlib_put_frame_queue_elt (hf);
vlib_mains[i]->check_frame_queues = 1;
ptd->handoff_queue_elt_by_thread_index[i] = 0;
}
else