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Pavel Begunkov authored
When checking for draining with __req_need_defer(), it tries to match how many requests were sent before a current one with number of already completed. Dropped SQEs are included in req->sequence, and they won't ever appear in CQ. To compensate for that, __req_need_defer() substracts ctx->cached_sq_dropped. However, what it should really use is number of SQEs dropped __before__ the current one. In other words, any submitted request shouldn't shouldn't affect dequeueing from the drain queue of previously submitted ones. Instead of saving proper ctx->cached_sq_dropped in each request, substract from req->sequence it at initialisation, so it includes number of properly submitted requests. note: it also changes behaviour of timeouts, but 1. it's already diverge from the description because of using SQ 2. the description is ambiguous regarding dropped SQEs Signed-off-by:
Pavel Begunkov <asml.silence@gmail.com> Signed-off-by:
Jens Axboe <axboe@kernel.dk>
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