From 428f13826855e3eea44bf13cedbf33f382ef8794 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Wed, 14 Feb 2024 12:59:36 -0700 Subject: io_uring/napi: ensure napi polling is aborted when work is available While testing io_uring NAPI with DEFER_TASKRUN, I ran into slowdowns and stalls in packet delivery. Turns out that while io_napi_busy_loop_should_end() aborts appropriately on regular task_work, it does not abort if we have local task_work pending. Move io_has_work() into the private io_uring.h header, and gate whether we should continue polling on that as well. This makes NAPI polling on send/receive work as designed with IORING_SETUP_DEFER_TASKRUN as well. Fixes: 8d0c12a80cde ("io-uring: add napi busy poll support") Signed-off-by: Jens Axboe --- io_uring/io_uring.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'io_uring/io_uring.h') diff --git a/io_uring/io_uring.h b/io_uring/io_uring.h index 1ca99522811b..6426ee382276 100644 --- a/io_uring/io_uring.h +++ b/io_uring/io_uring.h @@ -448,4 +448,15 @@ static inline bool io_file_can_poll(struct io_kiocb *req) } return false; } + +enum { + IO_CHECK_CQ_OVERFLOW_BIT, + IO_CHECK_CQ_DROPPED_BIT, +}; + +static inline bool io_has_work(struct io_ring_ctx *ctx) +{ + return test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq) || + !llist_empty(&ctx->work_llist); +} #endif -- cgit v1.2.3