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vcl svm: fix rx event loss

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When vcl_epoll_wait_handle_mq handles rx events exceeding maxevents, VPP will not signal because cursize > 0, and the remaining rx events cannot be triggered because the eventfd event has been read. Therefore, we should dequeue all events until cursize = 0. And then handle msg up to maxevents with vcl_epoll_wait_handle_mq_event and those beyond with vcl_handle_mq_event.

Type: fix
Signed-off-by: hanlin <hanlin_wang@163.com>
Change-Id: I8a0c87cb41c837deb8284b40f668cc3c7d9d6e56
Signed-off-by: hanlin <hanlin_wang@163.com>
(cherry picked from commit d0e646f6892e9c85278c9538760a8940c86dcdbb)
This commit is contained in:
hanlin
2020-05-11 22:20:37 +08:00
committed by Andrew Yourtchenko
parent f89bbaac78
commit acf0bd5567
1 changed files with 5 additions and 2 deletions
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7
src/vcl/vppcom.c
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@ -2752,7 +2752,7 @@ vcl_epoll_wait_handle_mq (vcl_worker_t * wrk, svm_msg_q_t * mq,
}
}
ASSERT (maxevents > *num_ev);
vcl_mq_dequeue_batch (wrk, mq, maxevents - *num_ev);
vcl_mq_dequeue_batch (wrk, mq, ~0);
svm_msg_q_unlock (mq);
handle_dequeued:
@ -2760,7 +2760,10 @@ handle_dequeued:
{
msg = vec_elt_at_index (wrk->mq_msg_vector, i);
e = svm_msg_q_msg_data (mq, msg);
vcl_epoll_wait_handle_mq_event (wrk, e, events, num_ev);
if (*num_ev < maxevents)
vcl_epoll_wait_handle_mq_event (wrk, e, events, num_ev);
else
vcl_handle_mq_event (wrk, e);
svm_msg_q_free_msg (mq, msg);
}
vec_reset_length (wrk->mq_msg_vector);