io_uring/zcrx: throttle receive requests

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io_zc_rx_tcp_recvmsg() continues until it fails or there is nothing to
receive. If the other side sends fast enough, we might get stuck in
io_zc_rx_tcp_recvmsg() producing more and more CQEs but not letting the
user to handle them leading to unbound latencies.

Break out of it based on an arbitrarily chosen limit, the upper layer
will either return to userspace or requeue the request.

Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: David Wei <dw@davidwei.uk>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20250215000947.789731-9-dw@davidwei.uk
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2025-02-14 16:09:43 -08:00 • committed by Jens Axboe

parent e0793de24a

commit 931dfae190

2 changed files with 11 additions and 0 deletions

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io_uring/net.c

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9

io_uring/zcrx.c

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