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io.cfa @ 8ae4165

ADTarm-ehast-experimentalenumforall-pointer-decayjacob/cs343-translationnew-astnew-ast-unique-exprpthread-emulationqualifiedEnum

Last change on this file since 8ae4165 was 8ae4165, checked in by Thierry Delisle <tdelisle@…>, 4 years ago
Moved interrupts in io.cfa to be more localized
Property mode set to `100644`
File size: 37.1 KB

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1	//
2	// Cforall Version 1.0.0 Copyright (C) 2020 University of Waterloo
3	//
4	// The contents of this file are covered under the licence agreement in the
5	// file "LICENCE" distributed with Cforall.
6	//
7	// io.cfa --
8	//
9	// Author : Thierry Delisle
10	// Created On : Thu Apr 23 17:31:00 2020
11	// Last Modified By :
12	// Last Modified On :
13	// Update Count :
14	//
15
16	// #define __CFA_DEBUG_PRINT_IO__
17	// #define __CFA_DEBUG_PRINT_IO_CORE__
18
19	#include "kernel.hfa"
20	#include "bitmanip.hfa"
21
22	#if !defined(HAVE_LINUX_IO_URING_H)
23	void __kernel_io_startup( cluster &, unsigned, bool ) {
24	// Nothing to do without io_uring
25	}
26
27	void __kernel_io_finish_start( cluster & ) {
28	// Nothing to do without io_uring
29	}
30
31	void __kernel_io_prepare_stop( cluster & ) {
32	// Nothing to do without io_uring
33	}
34
35	void __kernel_io_shutdown( cluster &, bool ) {
36	// Nothing to do without io_uring
37	}
38
39	#else
40	extern "C" {
41	#define _GNU_SOURCE /* See feature_test_macros(7) */
42	#include <errno.h>
43	#include <stdint.h>
44	#include <string.h>
45	#include <unistd.h>
46	#include <sys/mman.h>
47	#include <sys/syscall.h>
48
49	#include <linux/io_uring.h>
50	}
51
52	#include "bits/signal.hfa"
53	#include "kernel_private.hfa"
54	#include "thread.hfa"
55
56	uint32_t entries_per_cluster() {
57	return 256;
58	}
59
60	static void * __io_poller_slow( void * arg );
61
62	// Weirdly, some systems that do support io_uring don't actually define these
63	#ifdef __alpha__
64	/*
65	* alpha is the only exception, all other architectures
66	* have common numbers for new system calls.
67	*/
68	#ifndef __NR_io_uring_setup
69	#define __NR_io_uring_setup 535
70	#endif
71	#ifndef __NR_io_uring_enter
72	#define __NR_io_uring_enter 536
73	#endif
74	#ifndef __NR_io_uring_register
75	#define __NR_io_uring_register 537
76	#endif
77	#else /* !__alpha__ */
78	#ifndef __NR_io_uring_setup
79	#define __NR_io_uring_setup 425
80	#endif
81	#ifndef __NR_io_uring_enter
82	#define __NR_io_uring_enter 426
83	#endif
84	#ifndef __NR_io_uring_register
85	#define __NR_io_uring_register 427
86	#endif
87	#endif
88
89	// Fast poller user-thread
90	// Not using the "thread" keyword because we want to control
91	// more carefully when to start/stop it
92	struct __io_poller_fast {
93	struct __io_data * ring;
94	$thread thrd;
95	};
96
97	void ?{}( __io_poller_fast & this, struct cluster & cltr ) {
98	this.ring = cltr.io;
99	(this.thrd){ "Fast I/O Poller", cltr };
100	}
101	void ^?{}( __io_poller_fast & mutex this );
102	void main( __io_poller_fast & this );
103	static inline $thread * get_thread( __io_poller_fast & this ) { return &this.thrd; }
104	void ^?{}( __io_poller_fast & mutex this ) {}
105
106	struct __submition_data {
107	// Head and tail of the ring (associated with array)
108	volatile uint32_t * head;
109	volatile uint32_t * tail;
110
111	// The actual kernel ring which uses head/tail
112	// indexes into the sqes arrays
113	uint32_t * array;
114
115	// number of entries and mask to go with it
116	const uint32_t * num;
117	const uint32_t * mask;
118
119	// Submission flags (Not sure what for)
120	uint32_t * flags;
121
122	// number of sqes not submitted (whatever that means)
123	uint32_t * dropped;
124
125	// Like head/tail but not seen by the kernel
126	volatile uint32_t * ready;
127	uint32_t ready_cnt;
128
129	__spinlock_t lock;
130
131	// A buffer of sqes (not the actual ring)
132	struct io_uring_sqe * sqes;
133
134	// The location and size of the mmaped area
135	void * ring_ptr;
136	size_t ring_sz;
137	};
138
139	struct __completion_data {
140	// Head and tail of the ring
141	volatile uint32_t * head;
142	volatile uint32_t * tail;
143
144	// number of entries and mask to go with it
145	const uint32_t * mask;
146	const uint32_t * num;
147
148	// number of cqes not submitted (whatever that means)
149	uint32_t * overflow;
150
151	// the kernel ring
152	struct io_uring_cqe * cqes;
153
154	// The location and size of the mmaped area
155	void * ring_ptr;
156	size_t ring_sz;
157	};
158
159	struct __io_data {
160	struct __submition_data submit_q;
161	struct __completion_data completion_q;
162	uint32_t ring_flags;
163	int cltr_flags;
164	int fd;
165	semaphore submit;
166	volatile bool done;
167	struct {
168	struct {
169	__processor_id_t id;
170	void * stack;
171	pthread_t kthrd;
172	volatile bool blocked;
173	} slow;
174	__io_poller_fast fast;
175	__bin_sem_t sem;
176	} poller;
177	};
178
179	//=============================================================================================
180	// I/O Startup / Shutdown logic
181	//=============================================================================================
182	void __kernel_io_startup( cluster & this, unsigned io_flags, bool main_cluster ) {
183	this.io = malloc();
184
185	// Step 1 : call to setup
186	struct io_uring_params params;
187	memset(&params, 0, sizeof(params));
188
189	uint32_t nentries = entries_per_cluster();
190
191	int fd = syscall(__NR_io_uring_setup, nentries, &params );
192	if(fd < 0) {
193	abort("KERNEL ERROR: IO_URING SETUP - %s\n", strerror(errno));
194	}
195
196	// Step 2 : mmap result
197	memset( this.io, 0, sizeof(struct __io_data) );
198	struct __submition_data & sq = this.io->submit_q;
199	struct __completion_data & cq = this.io->completion_q;
200
201	// calculate the right ring size
202	sq.ring_sz = params.sq_off.array + (params.sq_entries * sizeof(unsigned) );
203	cq.ring_sz = params.cq_off.cqes + (params.cq_entries * sizeof(struct io_uring_cqe));
204
205	// Requires features
206	#if defined(IORING_FEAT_SINGLE_MMAP)
207	// adjust the size according to the parameters
208	if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) {
209	cq->ring_sz = sq->ring_sz = max(cq->ring_sz, sq->ring_sz);
210	}
211	#endif
212
213	// mmap the Submit Queue into existence
214	sq.ring_ptr = mmap(0, sq.ring_sz, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_SQ_RING);
215	if (sq.ring_ptr == (void*)MAP_FAILED) {
216	abort("KERNEL ERROR: IO_URING MMAP1 - %s\n", strerror(errno));
217	}
218
219	// Requires features
220	#if defined(IORING_FEAT_SINGLE_MMAP)
221	// mmap the Completion Queue into existence (may or may not be needed)
222	if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) {
223	cq->ring_ptr = sq->ring_ptr;
224	}
225	else
226	#endif
227	{
228	// We need multiple call to MMAP
229	cq.ring_ptr = mmap(0, cq.ring_sz, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_CQ_RING);
230	if (cq.ring_ptr == (void*)MAP_FAILED) {
231	munmap(sq.ring_ptr, sq.ring_sz);
232	abort("KERNEL ERROR: IO_URING MMAP2 - %s\n", strerror(errno));
233	}
234	}
235
236	// mmap the submit queue entries
237	size_t size = params.sq_entries * sizeof(struct io_uring_sqe);
238	sq.sqes = (struct io_uring_sqe *)mmap(0, size, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_SQES);
239	if (sq.sqes == (struct io_uring_sqe *)MAP_FAILED) {
240	munmap(sq.ring_ptr, sq.ring_sz);
241	if (cq.ring_ptr != sq.ring_ptr) munmap(cq.ring_ptr, cq.ring_sz);
242	abort("KERNEL ERROR: IO_URING MMAP3 - %s\n", strerror(errno));
243	}
244
245	// Get the pointers from the kernel to fill the structure
246	// submit queue
247	sq.head = (volatile uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.head);
248	sq.tail = (volatile uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.tail);
249	sq.mask = ( const uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_mask);
250	sq.num = ( const uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_entries);
251	sq.flags = ( uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.flags);
252	sq.dropped = ( uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.dropped);
253	sq.array = ( uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.array);
254
255	{
256	const uint32_t num = *sq.num;
257	for( i; num ) {
258	sq.sqes[i].user_data = 0ul64;
259	}
260	}
261
262	if( io_flags & CFA_CLUSTER_IO_POLLER_THREAD_SUBMITS ) {
263	/* paranoid */ verify( is_pow2( io_flags >> CFA_CLUSTER_IO_BUFFLEN_OFFSET ) \|\| ((io_flags >> CFA_CLUSTER_IO_BUFFLEN_OFFSET) < 8) );
264	sq.ready_cnt = max(io_flags >> CFA_CLUSTER_IO_BUFFLEN_OFFSET, 8);
265	sq.ready = alloc_align( 64, sq.ready_cnt );
266	for(i; sq.ready_cnt) {
267	sq.ready[i] = -1ul32;
268	}
269	}
270	else {
271	sq.ready_cnt = 0;
272	sq.ready = 0p;
273	}
274
275	// completion queue
276	cq.head = (volatile uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.head);
277	cq.tail = (volatile uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.tail);
278	cq.mask = ( const uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_mask);
279	cq.num = ( const uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_entries);
280	cq.overflow = ( uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.overflow);
281	cq.cqes = (struct io_uring_cqe *)(((intptr_t)cq.ring_ptr) + params.cq_off.cqes);
282
283	// some paranoid checks
284	/* paranoid / verifyf( (cq.mask) == ((cq.num) - 1ul32), "IO_URING Expected mask to be %u (%u entries), was %u", (cq.num) - 1ul32, cq.num, cq.mask );
285	/* paranoid / verifyf( (cq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *cq.num );
286	/* paranoid / verifyf( (cq.head) == 0, "IO_URING Expected head to be 0, got %u", *cq.head );
287	/* paranoid / verifyf( (cq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *cq.tail );
288
289	/* paranoid / verifyf( (sq.mask) == ((sq.num) - 1ul32), "IO_URING Expected mask to be %u (%u entries), was %u", (sq.num) - 1ul32, sq.num, sq.mask );
290	/* paranoid / verifyf( (sq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *sq.num );
291	/* paranoid / verifyf( (sq.head) == 0, "IO_URING Expected head to be 0, got %u", *sq.head );
292	/* paranoid / verifyf( (sq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *sq.tail );
293
294	// Update the global ring info
295	this.io->ring_flags = params.flags;
296	this.io->cltr_flags = io_flags;
297	this.io->fd = fd;
298	this.io->done = false;
299	(this.io->submit){ min(sq.num, cq.num) };
300
301	if(!main_cluster) {
302	__kernel_io_finish_start( this );
303	}
304	}
305
306	void __kernel_io_finish_start( cluster & this ) {
307	if( this.io->cltr_flags & CFA_CLUSTER_IO_POLLER_USER_THREAD ) {
308	__cfadbg_print_safe(io_core, "Kernel I/O : Creating fast poller for cluter %p\n", &this);
309	(this.io->poller.fast){ this };
310	__thrd_start( this.io->poller.fast, main );
311	}
312
313	// Create the poller thread
314	__cfadbg_print_safe(io_core, "Kernel I/O : Creating slow poller for cluter %p\n", &this);
315	this.io->poller.slow.blocked = false;
316	this.io->poller.slow.stack = __create_pthread( &this.io->poller.slow.kthrd, __io_poller_slow, &this );
317	}
318
319	void __kernel_io_prepare_stop( cluster & this ) {
320	__cfadbg_print_safe(io_core, "Kernel I/O : Stopping pollers for cluster\n", &this);
321	// Notify the poller thread of the shutdown
322	__atomic_store_n(&this.io->done, true, __ATOMIC_SEQ_CST);
323
324	// Stop the IO Poller
325	sigval val = { 1 };
326	pthread_sigqueue( this.io->poller.slow.kthrd, SIGUSR1, val );
327	post( this.io->poller.sem );
328
329	// Wait for the poller thread to finish
330	pthread_join( this.io->poller.slow.kthrd, 0p );
331	free( this.io->poller.slow.stack );
332
333	__cfadbg_print_safe(io_core, "Kernel I/O : Slow poller stopped for cluster\n", &this);
334
335	if( this.io->cltr_flags & CFA_CLUSTER_IO_POLLER_USER_THREAD ) {
336	with( this.io->poller.fast ) {
337	/* paranoid */ verify( this.nprocessors == 0 \|\| &this == mainCluster );
338	/* paranoid */ verify( !ready_mutate_islocked() );
339
340	// We need to adjust the clean-up based on where the thread is
341	if( thrd.state == Ready \|\| thrd.preempted != __NO_PREEMPTION ) {
342
343	ready_schedule_lock( (struct __processor_id_t *)active_processor() );
344
345	// This is the tricky case
346	// The thread was preempted and now it is on the ready queue
347	// The thread should be the last on the list
348	/* paranoid */ verify( thrd.link.next != 0p );
349
350	// Remove the thread from the ready queue of this cluster
351	__attribute__((unused)) bool removed = remove_head( &this, &thrd );
352	/* paranoid */ verify( removed );
353	thrd.link.next = 0p;
354	thrd.link.prev = 0p;
355	__cfaabi_dbg_debug_do( thrd.unpark_stale = true );
356
357	// Fixup the thread state
358	thrd.state = Blocked;
359	thrd.ticket = 0;
360	thrd.preempted = __NO_PREEMPTION;
361
362	ready_schedule_unlock( (struct __processor_id_t *)active_processor() );
363
364	// Pretend like the thread was blocked all along
365	}
366	// !!! This is not an else if !!!
367	if( thrd.state == Blocked ) {
368
369	// This is the "easy case"
370	// The thread is parked and can easily be moved to active cluster
371	verify( thrd.curr_cluster != active_cluster() \|\| thrd.curr_cluster == mainCluster );
372	thrd.curr_cluster = active_cluster();
373
374	// unpark the fast io_poller
375	unpark( &thrd __cfaabi_dbg_ctx2 );
376	}
377	else {
378
379	// The thread is in a weird state
380	// I don't know what to do here
381	abort("Fast poller thread is in unexpected state, cannot clean-up correctly\n");
382	}
383
384	}
385
386	^(this.io->poller.fast){};
387
388	__cfadbg_print_safe(io_core, "Kernel I/O : Fast poller stopped for cluster\n", &this);
389	}
390	}
391
392	void __kernel_io_shutdown( cluster & this, bool main_cluster ) {
393	if(!main_cluster) {
394	__kernel_io_prepare_stop( this );
395	}
396
397	// Shutdown the io rings
398	struct __submition_data & sq = this.io->submit_q;
399	struct __completion_data & cq = this.io->completion_q;
400
401	// unmap the submit queue entries
402	munmap(sq.sqes, (sq.num) sizeof(struct io_uring_sqe));
403
404	// unmap the Submit Queue ring
405	munmap(sq.ring_ptr, sq.ring_sz);
406
407	// unmap the Completion Queue ring, if it is different
408	if (cq.ring_ptr != sq.ring_ptr) {
409	munmap(cq.ring_ptr, cq.ring_sz);
410	}
411
412	// close the file descriptor
413	close(this.io->fd);
414
415	free( this.io->submit_q.ready ); // Maybe null, doesn't matter
416	free( this.io );
417	}
418
419	//=============================================================================================
420	// I/O Polling
421	//=============================================================================================
422	struct io_user_data {
423	int32_t result;
424	$thread * thrd;
425	};
426
427	// Process a single completion message from the io_uring
428	// This is NOT thread-safe
429	static [int, bool] __drain_io( & struct __io_data ring, * sigset_t mask, int waitcnt, bool in_kernel ) {
430	unsigned to_submit = 0;
431	if( ring.cltr_flags & CFA_CLUSTER_IO_POLLER_THREAD_SUBMITS ) {
432
433	// If the poller thread also submits, then we need to aggregate the submissions which are ready
434	uint32_t tail = *ring.submit_q.tail;
435	const uint32_t mask = *ring.submit_q.mask;
436
437	// Go through the list of ready submissions
438	for( i; ring.submit_q.ready_cnt ) {
439	// replace any submission with the sentinel, to consume it.
440	uint32_t idx = __atomic_exchange_n( &ring.submit_q.ready[i], -1ul32, __ATOMIC_RELAXED);
441
442	// If it was already the sentinel, then we are done
443	if( idx == -1ul32 ) continue;
444
445	// If we got a real submission, append it to the list
446	ring.submit_q.array[ (tail + to_submit) & mask ] = idx & mask;
447	to_submit++;
448	}
449
450	// Increment the tail based on how many we are ready to submit
451	__atomic_fetch_add(ring.submit_q.tail, to_submit, __ATOMIC_SEQ_CST);
452	}
453
454	const uint32_t smask = *ring.submit_q.mask;
455	uint32_t shead = *ring.submit_q.head;
456	int ret = syscall( __NR_io_uring_enter, ring.fd, to_submit, waitcnt, IORING_ENTER_GETEVENTS, mask, _NSIG / 8);
457	if( ret < 0 ) {
458	switch((int)errno) {
459	case EAGAIN:
460	case EINTR:
461	return -EAGAIN;
462	default:
463	abort( "KERNEL ERROR: IO_URING WAIT - %s\n", strerror(errno) );
464	}
465	}
466
467	// Release the consumed SQEs
468	for( i; ret ) {
469	uint32_t idx = ring.submit_q.array[ (i + shead) & smask ];
470	ring.submit_q.sqes[ idx ].user_data = 0;
471	}
472
473	uint32_t avail = 0;
474	uint32_t sqe_num = *ring.submit_q.num;
475	for(i; sqe_num) {
476	if( ring.submit_q.sqes[ i ].user_data == 0 ) avail++;
477	}
478
479	// update statistics
480	#if !defined(__CFA_NO_STATISTICS__)
481	__tls_stats()->io.submit_q.submit_avg.rdy += to_submit;
482	__tls_stats()->io.submit_q.submit_avg.csm += ret;
483	__tls_stats()->io.submit_q.submit_avg.avl += avail;
484	__tls_stats()->io.submit_q.submit_avg.cnt += 1;
485	#endif
486
487	// Drain the queue
488	unsigned head = *ring.completion_q.head;
489	unsigned tail = *ring.completion_q.tail;
490	const uint32_t mask = *ring.completion_q.mask;
491
492	// Memory barrier
493	__atomic_thread_fence( __ATOMIC_SEQ_CST );
494
495	// Nothing was new return 0
496	if (head == tail) {
497	return 0;
498	}
499
500	uint32_t count = tail - head;
501	for(i; count) {
502	unsigned idx = (head + i) & mask;
503	struct io_uring_cqe & cqe = ring.completion_q.cqes[idx];
504
505	/* paranoid */ verify(&cqe);
506
507	struct io_user_data * data = (struct io_user_data *)cqe.user_data;
508	__cfadbg_print_safe( io, "Kernel I/O : Performed reading io cqe %p, result %d for %p\n", data, cqe.res, data->thrd );
509
510	data->result = cqe.res;
511	if(!in_kernel) { unpark( data->thrd __cfaabi_dbg_ctx2 ); }
512	else { __unpark( &ring.poller.slow.id, data->thrd __cfaabi_dbg_ctx2 ); }
513	}
514
515	// Allow new submissions to happen
516	// V(ring.submit, count);
517
518	// Mark to the kernel that the cqe has been seen
519	// Ensure that the kernel only sees the new value of the head index after the CQEs have been read.
520	__atomic_thread_fence( __ATOMIC_SEQ_CST );
521	__atomic_fetch_add( ring.completion_q.head, count, __ATOMIC_RELAXED );
522
523	return [count, count > 0 \|\| to_submit > 0];
524	}
525
526	static void * __io_poller_slow( void * arg ) {
527	#if !defined( __CFA_NO_STATISTICS__ )
528	__stats_t local_stats;
529	__init_stats( &local_stats );
530	kernelTLS.this_stats = &local_stats;
531	#endif
532
533	cluster * cltr = (cluster *)arg;
534	struct __io_data & ring = *cltr->io;
535
536	ring.poller.slow.id.id = doregister( &ring.poller.slow.id );
537
538	sigset_t mask;
539	sigfillset(&mask);
540	if ( pthread_sigmask( SIG_BLOCK, &mask, 0p ) == -1 ) {
541	abort( "KERNEL ERROR: IO_URING - pthread_sigmask" );
542	}
543
544	sigdelset( &mask, SIGUSR1 );
545
546	verify( (ring.submit_q.head) == (ring.submit_q.tail) );
547	verify( (ring.completion_q.head) == (ring.completion_q.tail) );
548
549	__cfadbg_print_safe(io_core, "Kernel I/O : Slow poller for ring %p ready\n", &ring);
550
551	if( ring.cltr_flags & CFA_CLUSTER_IO_POLLER_USER_THREAD ) {
552	while(!__atomic_load_n(&ring.done, __ATOMIC_SEQ_CST)) {
553
554	__atomic_store_n( &ring.poller.slow.blocked, true, __ATOMIC_SEQ_CST );
555
556	// In the user-thread approach drain and if anything was drained,
557	// batton pass to the user-thread
558	int count;
559	bool again;
560	[count, again] = __drain_io( ring, &mask, 1, true );
561
562	__atomic_store_n( &ring.poller.slow.blocked, false, __ATOMIC_SEQ_CST );
563
564	// Update statistics
565	#if !defined(__CFA_NO_STATISTICS__)
566	__tls_stats()->io.complete_q.completed_avg.val += count;
567	__tls_stats()->io.complete_q.completed_avg.slow_cnt += 1;
568	#endif
569
570	if(again) {
571	__cfadbg_print_safe(io_core, "Kernel I/O : Moving to ring %p to fast poller\n", &ring);
572	__unpark( &ring.poller.slow.id, &ring.poller.fast.thrd __cfaabi_dbg_ctx2 );
573	wait( ring.poller.sem );
574	}
575	}
576	}
577	else {
578	while(!__atomic_load_n(&ring.done, __ATOMIC_SEQ_CST)) {
579	//In the naive approach, just poll the io completion queue directly
580	int count;
581	bool again;
582	[count, again] = __drain_io( ring, &mask, 1, true );
583
584	// Update statistics
585	#if !defined(__CFA_NO_STATISTICS__)
586	__tls_stats()->io.complete_q.completed_avg.val += count;
587	__tls_stats()->io.complete_q.completed_avg.slow_cnt += 1;
588	#endif
589	}
590	}
591
592	__cfadbg_print_safe(io_core, "Kernel I/O : Slow poller for ring %p stopping\n", &ring);
593
594	unregister( &ring.poller.slow.id );
595
596	return 0p;
597	}
598
599	void main( __io_poller_fast & this ) {
600	verify( this.ring->cltr_flags & CFA_CLUSTER_IO_POLLER_USER_THREAD );
601
602	// Start parked
603	park( __cfaabi_dbg_ctx );
604
605	__cfadbg_print_safe(io_core, "Kernel I/O : Fast poller for ring %p ready\n", &this.ring);
606
607	int reset = 0;
608
609	// Then loop until we need to start
610	while(!__atomic_load_n(&this.ring->done, __ATOMIC_SEQ_CST)) {
611
612	// Drain the io
613	int count;
614	bool again;
615	disable_interrupts();
616	[count, again] = __drain_io( *this.ring, 0p, 0, false );
617
618	if(!again) reset++;
619
620	// Update statistics
621	#if !defined(__CFA_NO_STATISTICS__)
622	__tls_stats()->io.complete_q.completed_avg.val += count;
623	__tls_stats()->io.complete_q.completed_avg.fast_cnt += 1;
624	#endif
625	enable_interrupts( __cfaabi_dbg_ctx );
626
627	// If we got something, just yield and check again
628	if(reset < 5) {
629	yield();
630	}
631	// We didn't get anything baton pass to the slow poller
632	else {
633	__cfadbg_print_safe(io_core, "Kernel I/O : Moving to ring %p to slow poller\n", &this.ring);
634	reset = 0;
635
636	// wake up the slow poller
637	post( this.ring->poller.sem );
638
639	// park this thread
640	park( __cfaabi_dbg_ctx );
641	}
642	}
643
644	__cfadbg_print_safe(io_core, "Kernel I/O : Fast poller for ring %p stopping\n", &this.ring);
645	}
646
647	static inline void __wake_poller( struct __io_data & ring ) __attribute__((artificial));
648	static inline void __wake_poller( struct __io_data & ring ) {
649	if(!__atomic_load_n( &ring.poller.slow.blocked, __ATOMIC_SEQ_CST)) return;
650
651	sigval val = { 1 };
652	pthread_sigqueue( ring.poller.slow.kthrd, SIGUSR1, val );
653	}
654
655	//=============================================================================================
656	// I/O Submissions
657	//=============================================================================================
658
659	// Submition steps :
660	// 1 - We need to make sure we don't overflow any of the buffer, P(ring.submit) to make sure
661	// entries are available. The semaphore make sure that there is no more operations in
662	// progress then the number of entries in the buffer. This probably limits concurrency
663	// more than necessary since submitted but not completed operations don't need any
664	// entries in user space. However, I don't know what happens if we overflow the buffers
665	// because too many requests completed at once. This is a safe approach in all cases.
666	// Furthermore, with hundreds of entries, this may be okay.
667	//
668	// 2 - Allocate a queue entry. The ring already has memory for all entries but only the ones
669	// listed in sq.array are visible by the kernel. For those not listed, the kernel does not
670	// offer any assurance that an entry is not being filled by multiple flags. Therefore, we
671	// need to write an allocator that allows allocating concurrently.
672	//
673	// 3 - Actually fill the submit entry, this is the only simple and straightforward step.
674	//
675	// 4 - Append the entry index to the array and adjust the tail accordingly. This operation
676	// needs to arrive to two concensus at the same time:
677	// A - The order in which entries are listed in the array: no two threads must pick the
678	// same index for their entries
679	// B - When can the tail be update for the kernel. EVERY entries in the array between
680	// head and tail must be fully filled and shouldn't ever be touched again.
681	//
682
683	static inline [* struct io_uring_sqe, uint32_t] __submit_alloc( struct __io_data & ring, uint64_t data ) {
684	verify( data != 0 );
685
686
687	// Prepare the data we need
688	__attribute((unused)) int len = 0;
689	__attribute((unused)) int block = 0;
690	uint32_t cnt = *ring.submit_q.num;
691	uint32_t mask = *ring.submit_q.mask;
692
693	disable_interrupts();
694	uint32_t off = __tls_rand();
695	enable_interrupts( __cfaabi_dbg_ctx );
696
697	// Loop around looking for an available spot
698	for() {
699	// Look through the list starting at some offset
700	for(i; cnt) {
701	uint64_t expected = 0;
702	uint32_t idx = (i + off) & mask;
703	struct io_uring_sqe * sqe = &ring.submit_q.sqes[idx];
704	volatile uint64_t * udata = &sqe->user_data;
705
706	if( *udata == expected &&
707	__atomic_compare_exchange_n( udata, &expected, data, true, __ATOMIC_SEQ_CST, __ATOMIC_RELAXED ) )
708	{
709	// update statistics
710	#if !defined(__CFA_NO_STATISTICS__)
711	disable_interrupts();
712	__tls_stats()->io.submit_q.alloc_avg.val += len;
713	__tls_stats()->io.submit_q.alloc_avg.block += block;
714	__tls_stats()->io.submit_q.alloc_avg.cnt += 1;
715	enable_interrupts( __cfaabi_dbg_ctx );
716	#endif
717
718
719	// Success return the data
720	return [sqe, idx];
721	}
722	verify(expected != data);
723
724	len ++;
725	}
726
727	block++;
728	yield();
729	}
730	}
731
732	static inline void __submit( struct __io_data & ring, uint32_t idx ) {
733	// Get now the data we definetely need
734	uint32_t * const tail = ring.submit_q.tail;
735	const uint32_t mask = *ring.submit_q.mask;
736
737	disable_interrupts();
738
739	// There are 2 submission schemes, check which one we are using
740	if( ring.cltr_flags & CFA_CLUSTER_IO_POLLER_THREAD_SUBMITS ) {
741	// If the poller thread submits, then we just need to add this to the ready array
742
743	/* paranoid */ verify( idx <= mask );
744	/* paranoid */ verify( idx != -1ul32 );
745
746	// We need to find a spot in the ready array
747	__attribute((unused)) int len = 0;
748	__attribute((unused)) int block = 0;
749	uint32_t ready_mask = ring.submit_q.ready_cnt - 1;
750	uint32_t off = __tls_rand();
751	LOOKING: for() {
752	for(i; ring.submit_q.ready_cnt) {
753	uint32_t ii = (i + off) & ready_mask;
754	uint32_t expected = -1ul32;
755	if( __atomic_compare_exchange_n( &ring.submit_q.ready[ii], &expected, idx, true, __ATOMIC_SEQ_CST, __ATOMIC_RELAXED ) ) {
756	break LOOKING;
757	}
758	verify(expected != idx);
759
760	len ++;
761	}
762
763	block++;
764	yield();
765	}
766
767	__wake_poller( ring );
768
769	// update statistics
770	#if !defined(__CFA_NO_STATISTICS__)
771	__tls_stats()->io.submit_q.look_avg.val += len;
772	__tls_stats()->io.submit_q.look_avg.block += block;
773	__tls_stats()->io.submit_q.look_avg.cnt += 1;
774	#endif
775
776	__cfadbg_print_safe( io, "Kernel I/O : Added %u to ready for %p\n", idx, active_thread() );
777	}
778	else {
779	// get mutual exclusion
780	lock(ring.submit_q.lock __cfaabi_dbg_ctx2);
781
782	// Append to the list of ready entries
783
784	/* paranoid */ verify( idx <= mask );
785
786	ring.submit_q.array[ (*tail) & mask ] = idx & mask;
787	__atomic_fetch_add(tail, 1ul32, __ATOMIC_SEQ_CST);
788
789	// Submit however, many entries need to be submitted
790	int ret = syscall( __NR_io_uring_enter, ring.fd, 1, 0, 0, 0p, 0);
791	if( ret < 0 ) {
792	switch((int)errno) {
793	default:
794	abort( "KERNEL ERROR: IO_URING SUBMIT - %s\n", strerror(errno) );
795	}
796	}
797
798	// update statistics
799	#if !defined(__CFA_NO_STATISTICS__)
800	__tls_stats()->io.submit_q.submit_avg.csm += 1;
801	__tls_stats()->io.submit_q.submit_avg.cnt += 1;
802	#endif
803
804	unlock(ring.submit_q.lock);
805
806	__cfadbg_print_safe( io, "Kernel I/O : Performed io_submit for %p, returned %d\n", active_thread(), ret );
807	}
808
809	enable_interrupts( __cfaabi_dbg_ctx );
810	}
811
812	static inline void ?{}(struct io_uring_sqe & this, uint8_t opcode, int fd) {
813	this.opcode = opcode;
814	#if !defined(IOSQE_ASYNC)
815	this.flags = 0;
816	#else
817	this.flags = IOSQE_ASYNC;
818	#endif
819	this.ioprio = 0;
820	this.fd = fd;
821	this.off = 0;
822	this.addr = 0;
823	this.len = 0;
824	this.rw_flags = 0;
825	this.__pad2[0] = this.__pad2[1] = this.__pad2[2] = 0;
826	}
827
828	static inline void ?{}(struct io_uring_sqe & this, uint8_t opcode, int fd, void * addr, uint32_t len, uint64_t off ) {
829	(this){ opcode, fd };
830	this.off = off;
831	this.addr = (uint64_t)addr;
832	this.len = len;
833	}
834
835
836	//=============================================================================================
837	// I/O Interface
838	//=============================================================================================
839
840	#define __submit_prelude \
841	io_user_data data = { 0, active_thread() }; \
842	struct __io_data & ring = *data.thrd->curr_cluster->io; \
843	struct io_uring_sqe * sqe; \
844	uint32_t idx; \
845	[sqe, idx] = __submit_alloc( ring, (uint64_t)&data );
846
847	#define __submit_wait \
848	/__cfaabi_bits_print_safe( STDERR_FILENO, "Preparing user data %p for %p\n", &data, data.thrd );/ \
849	verify( sqe->user_data == (uint64_t)&data ); \
850	__submit( ring, idx ); \
851	park( __cfaabi_dbg_ctx ); \
852	return data.result;
853	#endif
854
855	// Some forward declarations
856	extern "C" {
857	#include <unistd.h>
858	#include <sys/types.h>
859	#include <sys/socket.h>
860	#include <sys/syscall.h>
861
862	#if defined(HAVE_PREADV2)
863	struct iovec;
864	extern ssize_t preadv2 (int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags);
865	#endif
866	#if defined(HAVE_PWRITEV2)
867	struct iovec;
868	extern ssize_t pwritev2(int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags);
869	#endif
870
871	extern int fsync(int fd);
872	extern int sync_file_range(int fd, int64_t offset, int64_t nbytes, unsigned int flags);
873
874	struct msghdr;
875	struct sockaddr;
876	extern ssize_t sendmsg(int sockfd, const struct msghdr *msg, int flags);
877	extern ssize_t recvmsg(int sockfd, struct msghdr *msg, int flags);
878	extern ssize_t send(int sockfd, const void *buf, size_t len, int flags);
879	extern ssize_t recv(int sockfd, void *buf, size_t len, int flags);
880	extern int accept4(int sockfd, struct sockaddr addr, socklen_t addrlen, int flags);
881	extern int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen);
882
883	extern int fallocate(int fd, int mode, uint64_t offset, uint64_t len);
884	extern int posix_fadvise(int fd, uint64_t offset, uint64_t len, int advice);
885	extern int madvise(void *addr, size_t length, int advice);
886
887	extern int openat(int dirfd, const char *pathname, int flags, mode_t mode);
888	extern int close(int fd);
889
890	extern ssize_t read (int fd, void *buf, size_t count);
891	}
892
893	//-----------------------------------------------------------------------------
894	// Asynchronous operations
895	#if defined(HAVE_PREADV2)
896	ssize_t cfa_preadv2(int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags) {
897	#if !defined(HAVE_LINUX_IO_URING_H) \|\| !defined(IORING_OP_READV)
898	return preadv2(fd, iov, iovcnt, offset, flags);
899	#else
900	__submit_prelude
901
902	(*sqe){ IORING_OP_READV, fd, iov, iovcnt, offset };
903
904	__submit_wait
905	#endif
906	}
907	#endif
908
909	#if defined(HAVE_PWRITEV2)
910	ssize_t cfa_pwritev2(int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags) {
911	#if !defined(HAVE_LINUX_IO_URING_H) \|\| !defined(IORING_OP_WRITEV)
912	return pwritev2(fd, iov, iovcnt, offset, flags);
913	#else
914	__submit_prelude
915
916	(*sqe){ IORING_OP_WRITEV, fd, iov, iovcnt, offset };
917
918	__submit_wait
919	#endif
920	}
921	#endif
922
923	int cfa_fsync(int fd) {
924	#if !defined(HAVE_LINUX_IO_URING_H) \|\| !defined(IORING_OP_FSYNC)
925	return fsync(fd);
926	#else
927	__submit_prelude
928
929	(*sqe){ IORING_OP_FSYNC, fd };
930
931	__submit_wait
932	#endif
933	}
934
935	int cfa_sync_file_range(int fd, int64_t offset, int64_t nbytes, unsigned int flags) {
936	#if !defined(HAVE_LINUX_IO_URING_H) \|\| !defined(IORING_OP_SYNC_FILE_RANGE)
937	return sync_file_range(fd, offset, nbytes, flags);
938	#else
939	__submit_prelude
940
941	(*sqe){ IORING_OP_SYNC_FILE_RANGE, fd };
942	sqe->off = offset;
943	sqe->len = nbytes;
944	sqe->sync_range_flags = flags;
945
946	__submit_wait
947	#endif
948	}
949
950
951	ssize_t cfa_sendmsg(int sockfd, const struct msghdr *msg, int flags) {
952	#if !defined(HAVE_LINUX_IO_URING_H) \|\| !defined(IORING_OP_SENDMSG)
953	return sendmsg(sockfd, msg, flags);
954	#else
955	__submit_prelude
956
957	(*sqe){ IORING_OP_SENDMSG, sockfd, msg, 1, 0 };
958	sqe->msg_flags = flags;
959
960	__submit_wait
961	#endif
962	}
963
964	ssize_t cfa_recvmsg(int sockfd, struct msghdr *msg, int flags) {
965	#if !defined(HAVE_LINUX_IO_URING_H) \|\| !defined(IORING_OP_RECVMSG)
966	return recvmsg(sockfd, msg, flags);
967	#else
968	__submit_prelude
969
970	(*sqe){ IORING_OP_RECVMSG, sockfd, msg, 1, 0 };
971	sqe->msg_flags = flags;
972
973	__submit_wait
974	#endif
975	}
976
977	ssize_t cfa_send(int sockfd, const void *buf, size_t len, int flags) {
978	#if !defined(HAVE_LINUX_IO_URING_H) \|\| !defined(IORING_OP_SEND)
979	return send( sockfd, buf, len, flags );
980	#else
981	__submit_prelude
982
983	(*sqe){ IORING_OP_SEND, sockfd };
984	sqe->addr = (uint64_t)buf;
985	sqe->len = len;
986	sqe->msg_flags = flags;
987
988	__submit_wait
989	#endif
990	}
991
992	ssize_t cfa_recv(int sockfd, void *buf, size_t len, int flags) {
993	#if !defined(HAVE_LINUX_IO_URING_H) \|\| !defined(IORING_OP_RECV)
994	return recv( sockfd, buf, len, flags );
995	#else
996	__submit_prelude
997
998	(*sqe){ IORING_OP_RECV, sockfd };
999	sqe->addr = (uint64_t)buf;
1000	sqe->len = len;
1001	sqe->msg_flags = flags;
1002
1003	__submit_wait
1004	#endif
1005	}
1006
1007	int cfa_accept4(int sockfd, struct sockaddr addr, socklen_t addrlen, int flags) {
1008	#if !defined(HAVE_LINUX_IO_URING_H) \|\| !defined(IORING_OP_ACCEPT)
1009	return accept4( sockfd, addr, addrlen, flags );
1010	#else
1011	__submit_prelude
1012
1013	(*sqe){ IORING_OP_ACCEPT, sockfd };
1014	sqe->addr = addr;
1015	sqe->addr2 = addrlen;
1016	sqe->accept_flags = flags;
1017
1018	__submit_wait
1019	#endif
1020	}
1021
1022	int cfa_connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen) {
1023	#if !defined(HAVE_LINUX_IO_URING_H) \|\| !defined(IORING_OP_CONNECT)
1024	return connect( sockfd, addr, addrlen );
1025	#else
1026	__submit_prelude
1027
1028	(*sqe){ IORING_OP_CONNECT, sockfd };
1029	sqe->addr = (uint64_t)addr;
1030	sqe->off = addrlen;
1031
1032	__submit_wait
1033	#endif
1034	}
1035
1036	int cfa_fallocate(int fd, int mode, uint64_t offset, uint64_t len) {
1037	#if !defined(HAVE_LINUX_IO_URING_H) \|\| !defined(IORING_OP_FALLOCATE)
1038	return fallocate( fd, mode, offset, len );
1039	#else
1040	__submit_prelude
1041
1042	(*sqe){ IORING_OP_FALLOCATE, fd };
1043	sqe->off = offset;
1044	sqe->len = length;
1045	sqe->mode = mode;
1046
1047	__submit_wait
1048	#endif
1049	}
1050
1051	int cfa_fadvise(int fd, uint64_t offset, uint64_t len, int advice) {
1052	#if !defined(HAVE_LINUX_IO_URING_H) \|\| !defined(IORING_OP_FADVISE)
1053	return posix_fadvise( fd, offset, len, advice );
1054	#else
1055	__submit_prelude
1056
1057	(*sqe){ IORING_OP_FADVISE, fd };
1058	sqe->off = (uint64_t)offset;
1059	sqe->len = length;
1060	sqe->fadvise_advice = advice;
1061
1062	__submit_wait
1063	#endif
1064	}
1065
1066	int cfa_madvise(void *addr, size_t length, int advice) {
1067	#if !defined(HAVE_LINUX_IO_URING_H) \|\| !defined(IORING_OP_MADVISE)
1068	return madvise( addr, length, advice );
1069	#else
1070	__submit_prelude
1071
1072	(*sqe){ IORING_OP_MADVISE, 0 };
1073	sqe->addr = (uint64_t)addr;
1074	sqe->len = length;
1075	sqe->fadvise_advice = advice;
1076
1077	__submit_wait
1078	#endif
1079	}
1080
1081	int cfa_openat(int dirfd, const char *pathname, int flags, mode_t mode) {
1082	#if !defined(HAVE_LINUX_IO_URING_H) \|\| !defined(IORING_OP_OPENAT)
1083	return openat( dirfd, pathname, flags, mode );
1084	#else
1085	__submit_prelude
1086
1087	(*sqe){ IORING_OP_OPENAT, dirfd };
1088	sqe->addr = (uint64_t)pathname;
1089	sqe->open_flags = flags;
1090	sqe->mode = mode;
1091
1092	__submit_wait
1093	#endif
1094	}
1095
1096	int cfa_close(int fd) {
1097	#if !defined(HAVE_LINUX_IO_URING_H) \|\| !defined(IORING_OP_CLOSE)
1098	return close( fd );
1099	#else
1100	__submit_prelude
1101
1102	(*sqe){ IORING_OP_CLOSE, fd };
1103
1104	__submit_wait
1105	#endif
1106	}
1107
1108
1109	ssize_t cfa_read(int fd, void *buf, size_t count) {
1110	#if !defined(HAVE_LINUX_IO_URING_H) \|\| !defined(IORING_OP_READ)
1111	return read( fd, buf, count );
1112	#else
1113	__submit_prelude
1114
1115	(*sqe){ IORING_OP_READ, fd, buf, count, 0 };
1116
1117	__submit_wait
1118	#endif
1119	}
1120
1121	ssize_t cfa_write(int fd, void *buf, size_t count) {
1122	#if !defined(HAVE_LINUX_IO_URING_H) \|\| !defined(IORING_OP_WRITE)
1123	return read( fd, buf, count );
1124	#else
1125	__submit_prelude
1126
1127	(*sqe){ IORING_OP_WRITE, fd, buf, count, 0 };
1128
1129	__submit_wait
1130	#endif
1131	}
1132
1133	//-----------------------------------------------------------------------------
1134	// Check if a function is asynchronous
1135
1136	// Macro magic to reduce the size of the following switch case
1137	#define IS_DEFINED_APPLY(f, ...) f(__VA_ARGS__)
1138	#define IS_DEFINED_SECOND(first, second, ...) second
1139	#define IS_DEFINED_TEST(expansion) _CFA_IO_FEATURE_##expansion
1140	#define IS_DEFINED(macro) IS_DEFINED_APPLY( IS_DEFINED_SECOND,IS_DEFINED_TEST(macro) false, true)
1141
1142	bool has_user_level_blocking( fptr_t func ) {
1143	#if defined(HAVE_LINUX_IO_URING_H)
1144	#if defined(HAVE_PREADV2)
1145	if( /func == (fptr_t)preadv2 \|\| /
1146	func == (fptr_t)cfa_preadv2 )
1147	#define _CFA_IO_FEATURE_IORING_OP_READV ,
1148	return IS_DEFINED(IORING_OP_READV);
1149	#endif
1150
1151	#if defined(HAVE_PWRITEV2)
1152	if( /func == (fptr_t)pwritev2 \|\| /
1153	func == (fptr_t)cfa_pwritev2 )
1154	#define _CFA_IO_FEATURE_IORING_OP_WRITEV ,
1155	return IS_DEFINED(IORING_OP_WRITEV);
1156	#endif
1157
1158	if( /func == (fptr_t)fsync \|\| /
1159	func == (fptr_t)cfa_fsync )
1160	#define _CFA_IO_FEATURE_IORING_OP_FSYNC ,
1161	return IS_DEFINED(IORING_OP_FSYNC);
1162
1163	if( /func == (fptr_t)ync_file_range \|\| /
1164	func == (fptr_t)cfa_sync_file_range )
1165	#define _CFA_IO_FEATURE_IORING_OP_SYNC_FILE_RANGE ,
1166	return IS_DEFINED(IORING_OP_SYNC_FILE_RANGE);
1167
1168	if( /func == (fptr_t)sendmsg \|\| /
1169	func == (fptr_t)cfa_sendmsg )
1170	#define _CFA_IO_FEATURE_IORING_OP_SENDMSG ,
1171	return IS_DEFINED(IORING_OP_SENDMSG);
1172
1173	if( /func == (fptr_t)recvmsg \|\| /
1174	func == (fptr_t)cfa_recvmsg )
1175	#define _CFA_IO_FEATURE_IORING_OP_RECVMSG ,
1176	return IS_DEFINED(IORING_OP_RECVMSG);
1177
1178	if( /func == (fptr_t)send \|\| /
1179	func == (fptr_t)cfa_send )
1180	#define _CFA_IO_FEATURE_IORING_OP_SEND ,
1181	return IS_DEFINED(IORING_OP_SEND);
1182
1183	if( /func == (fptr_t)recv \|\| /
1184	func == (fptr_t)cfa_recv )
1185	#define _CFA_IO_FEATURE_IORING_OP_RECV ,
1186	return IS_DEFINED(IORING_OP_RECV);
1187
1188	if( /func == (fptr_t)accept4 \|\| /
1189	func == (fptr_t)cfa_accept4 )
1190	#define _CFA_IO_FEATURE_IORING_OP_ACCEPT ,
1191	return IS_DEFINED(IORING_OP_ACCEPT);
1192
1193	if( /func == (fptr_t)connect \|\| /
1194	func == (fptr_t)cfa_connect )
1195	#define _CFA_IO_FEATURE_IORING_OP_CONNECT ,
1196	return IS_DEFINED(IORING_OP_CONNECT);
1197
1198	if( /func == (fptr_t)fallocate \|\| /
1199	func == (fptr_t)cfa_fallocate )
1200	#define _CFA_IO_FEATURE_IORING_OP_FALLOCATE ,
1201	return IS_DEFINED(IORING_OP_FALLOCATE);
1202
1203	if( /func == (fptr_t)posix_fadvise \|\| /
1204	func == (fptr_t)cfa_fadvise )
1205	#define _CFA_IO_FEATURE_IORING_OP_FADVISE ,
1206	return IS_DEFINED(IORING_OP_FADVISE);
1207
1208	if( /func == (fptr_t)madvise \|\| /
1209	func == (fptr_t)cfa_madvise )
1210	#define _CFA_IO_FEATURE_IORING_OP_MADVISE ,
1211	return IS_DEFINED(IORING_OP_MADVISE);
1212
1213	if( /func == (fptr_t)openat \|\| /
1214	func == (fptr_t)cfa_openat )
1215	#define _CFA_IO_FEATURE_IORING_OP_OPENAT ,
1216	return IS_DEFINED(IORING_OP_OPENAT);
1217
1218	if( /func == (fptr_t)close \|\| /
1219	func == (fptr_t)cfa_close )
1220	#define _CFA_IO_FEATURE_IORING_OP_CLOSE ,
1221	return IS_DEFINED(IORING_OP_CLOSE);
1222
1223	if( /func == (fptr_t)read \|\| /
1224	func == (fptr_t)cfa_read )
1225	#define _CFA_IO_FEATURE_IORING_OP_READ ,
1226	return IS_DEFINED(IORING_OP_READ);
1227
1228	if( /func == (fptr_t)write \|\| /
1229	func == (fptr_t)cfa_write )
1230	#define _CFA_IO_FEATURE_IORING_OP_WRITE ,
1231	return IS_DEFINED(IORING_OP_WRITE);
1232	#endif
1233
1234	return false;
1235	}

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