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io_uring: move max entry definition and ring sizing into header

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In preparation for needing this somewhere else, move the definitions
for the maximum CQ and SQ ring size into io_uring.h. Make the
rings_size() helper available as well, and have it take just the setup
flags argument rather than the fill ring pointer. That's all that is
needed.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2024-10-21 13:29:39 -06:00
parent 882dec6c39
commit 09d0a8ea7f
2 changed files with 11 additions and 8 deletions
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14
io_uring/io_uring.c
View File

@ -105,9 +105,6 @@
#include "alloc_cache.h"
#include "eventfd.h"
#define IORING_MAX_ENTRIES 32768
#define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES)
#define SQE_COMMON_FLAGS (IOSQE_FIXED_FILE | IOSQE_IO_LINK | \
IOSQE_IO_HARDLINK | IOSQE_ASYNC)
@ -2667,8 +2664,8 @@ static void io_rings_free(struct io_ring_ctx *ctx)
ctx->sq_sqes = NULL;
}
static unsigned long rings_size(struct io_ring_ctx *ctx, unsigned int sq_entries,
unsigned int cq_entries, size_t *sq_offset)
unsigned long rings_size(unsigned int flags, unsigned int sq_entries,
unsigned int cq_entries, size_t *sq_offset)
{
struct io_rings *rings;
size_t off, sq_array_size;
@ -2676,7 +2673,7 @@ static unsigned long rings_size(struct io_ring_ctx *ctx, unsigned int sq_entries
off = struct_size(rings, cqes, cq_entries);
if (off == SIZE_MAX)
return SIZE_MAX;
if (ctx->flags & IORING_SETUP_CQE32) {
if (flags & IORING_SETUP_CQE32) {
if (check_shl_overflow(off, 1, &off))
return SIZE_MAX;
}
@ -2687,7 +2684,7 @@ static unsigned long rings_size(struct io_ring_ctx *ctx, unsigned int sq_entries
return SIZE_MAX;
#endif
if (ctx->flags & IORING_SETUP_NO_SQARRAY) {
if (flags & IORING_SETUP_NO_SQARRAY) {
*sq_offset = SIZE_MAX;
return off;
}
@ -3434,7 +3431,8 @@ static __cold int io_allocate_scq_urings(struct io_ring_ctx *ctx,
ctx->sq_entries = p->sq_entries;
ctx->cq_entries = p->cq_entries;
size = rings_size(ctx, p->sq_entries, p->cq_entries, &sq_array_offset);
size = rings_size(ctx->flags, p->sq_entries, p->cq_entries,
&sq_array_offset);
if (size == SIZE_MAX)
return -EOVERFLOW;

5
io_uring/io_uring.h
View File

@ -65,6 +65,11 @@ static inline bool io_should_wake(struct io_wait_queue *iowq)
return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts;
}
#define IORING_MAX_ENTRIES 32768
#define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES)
unsigned long rings_size(unsigned int flags, unsigned int sq_entries,
unsigned int cq_entries, size_t *sq_offset);
bool io_cqe_cache_refill(struct io_ring_ctx *ctx, bool overflow);
int io_run_task_work_sig(struct io_ring_ctx *ctx);
void io_req_defer_failed(struct io_kiocb *req, s32 res);