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io_uring: add mshot helper for posting CQE32

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Add a helper for posting 32 byte CQEs in a multishot mode and add a cmd
helper on top. As it specifically works with requests, the helper ignore
the passed in cqe->user_data and sets it to the one stored in the
request.

The command helper is only valid with multishot requests.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c29d7720c16e1f981cfaa903df187138baa3946b.1750065793.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2025-06-16 10:46:28 +01:00 committed by Jens Axboe
parent b955754959
commit ac479eac22
4 changed files with 56 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

40
io_uring/io_uring.c
View file

@ -793,6 +793,21 @@ bool io_cqe_cache_refill(struct io_ring_ctx *ctx, bool overflow)
return true;
}
static bool io_fill_cqe_aux32(struct io_ring_ctx *ctx,
struct io_uring_cqe src_cqe[2])
{
struct io_uring_cqe *cqe;
if (WARN_ON_ONCE(!(ctx->flags & IORING_SETUP_CQE32)))
return false;
if (unlikely(!io_get_cqe(ctx, &cqe)))
return false;
memcpy(cqe, src_cqe, 2 * sizeof(*cqe));
trace_io_uring_complete(ctx, NULL, cqe);
return true;
}
static bool io_fill_cqe_aux(struct io_ring_ctx *ctx, u64 user_data, s32 res,
u32 cflags)
{
@ -904,6 +919,31 @@ bool io_req_post_cqe(struct io_kiocb *req, s32 res, u32 cflags)
return posted;
}
/*
* A helper for multishot requests posting additional CQEs.
* Should only be used from a task_work including IO_URING_F_MULTISHOT.
*/
bool io_req_post_cqe32(struct io_kiocb *req, struct io_uring_cqe cqe[2])
{
struct io_ring_ctx *ctx = req->ctx;
bool posted;
lockdep_assert(!io_wq_current_is_worker());
lockdep_assert_held(&ctx->uring_lock);
cqe[0].user_data = req->cqe.user_data;
if (!ctx->lockless_cq) {
spin_lock(&ctx->completion_lock);
posted = io_fill_cqe_aux32(ctx, cqe);
spin_unlock(&ctx->completion_lock);
} else {
posted = io_fill_cqe_aux32(ctx, cqe);
}
ctx->submit_state.cq_flush = true;
return posted;
}
static void io_req_complete_post(struct io_kiocb *req, unsigned issue_flags)
{
struct io_ring_ctx *ctx = req->ctx;

1
io_uring/io_uring.h
View file

@ -81,6 +81,7 @@ void io_req_defer_failed(struct io_kiocb *req, s32 res);
bool io_post_aux_cqe(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags);
void io_add_aux_cqe(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags);
bool io_req_post_cqe(struct io_kiocb *req, s32 res, u32 cflags);
bool io_req_post_cqe32(struct io_kiocb *req, struct io_uring_cqe src_cqe[2]);
void __io_commit_cqring_flush(struct io_ring_ctx *ctx);
void io_req_track_inflight(struct io_kiocb *req);

11
io_uring/uring_cmd.c
View file

@ -328,3 +328,14 @@ int io_cmd_poll_multishot(struct io_uring_cmd *cmd,
ret = io_arm_apoll(req, issue_flags, mask);
return ret == IO_APOLL_OK ? -EIOCBQUEUED : -ECANCELED;
}
bool io_uring_cmd_post_mshot_cqe32(struct io_uring_cmd *cmd,
unsigned int issue_flags,
struct io_uring_cqe cqe[2])
{
struct io_kiocb *req = cmd_to_io_kiocb(cmd);
if (WARN_ON_ONCE(!(issue_flags & IO_URING_F_MULTISHOT)))
return false;
return io_req_post_cqe32(req, cqe);
}

4
io_uring/uring_cmd.h
View file

@ -17,6 +17,10 @@ void io_uring_cmd_cleanup(struct io_kiocb *req);
bool io_uring_try_cancel_uring_cmd(struct io_ring_ctx *ctx,
struct io_uring_task *tctx, bool cancel_all);
bool io_uring_cmd_post_mshot_cqe32(struct io_uring_cmd *cmd,
unsigned int issue_flags,
struct io_uring_cqe cqe[2]);
void io_cmd_cache_free(const void *entry);
int io_cmd_poll_multishot(struct io_uring_cmd *cmd,