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io_uring/zcrx: count zcrx users

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zcrx tries to detach ifq / terminate page pools when the io_uring ctx
owning it is being destroyed. There will be multiple io_uring instances
attached to it in the future, so add a separate counter to track the
users. Note, refs can't be reused for this purpose as it only used to
prevent zcrx and rings destruction, and also used by page pools to keep
it alive.

Signed-off-by: David Wei <dw@davidwei.uk>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
2025-11-13 10:46:14 +00:00
committed by Jens Axboe
parent 475eb39b00
commit 39c9676f78
2 changed files with 7 additions and 2 deletions
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7
io_uring/zcrx.c
View File

@@ -482,6 +482,7 @@ static struct io_zcrx_ifq *io_zcrx_ifq_alloc(struct io_ring_ctx *ctx)
spin_lock_init(&ifq->rq_lock);
mutex_init(&ifq->pp_lock);
refcount_set(&ifq->refs, 1);
refcount_set(&ifq->user_refs, 1);
return ifq;
}
@@ -742,8 +743,10 @@ void io_unregister_zcrx_ifqs(struct io_ring_ctx *ctx)
if (!ifq)
break;
io_close_queue(ifq);
io_zcrx_scrub(ifq);
if (refcount_dec_and_test(&ifq->user_refs)) {
io_close_queue(ifq);
io_zcrx_scrub(ifq);
}
io_put_zcrx_ifq(ifq);
}

2
io_uring/zcrx.h
View File

@@ -55,6 +55,8 @@ struct io_zcrx_ifq {
struct net_device *netdev;
netdevice_tracker netdev_tracker;
refcount_t refs;
/* counts userspace facing users like io_uring */
refcount_t user_refs;
/*
* Page pool and net configuration lock, can be taken deeper in the