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228 | |
228 | |
229 | /* the submit/completion queue entries */ |
229 | /* the submit/completion queue entries */ |
230 | #define EV_SQES ((struct io_uring_sqe *) iouring_sqes) |
230 | #define EV_SQES ((struct io_uring_sqe *) iouring_sqes) |
231 | #define EV_CQES ((struct io_uring_cqe *)((char *)iouring_cq_ring + iouring_cq_cqes)) |
231 | #define EV_CQES ((struct io_uring_cqe *)((char *)iouring_cq_ring + iouring_cq_cqes)) |
232 | |
232 | |
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233 | /* TODO: this is not enough, we might have to reap events */ |
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234 | /* TODO: but we can't, as that will re-arm events, causing */ |
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235 | /* TODO: an endless loop in fd_reify */ |
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236 | static int |
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237 | iouring_enter (EV_P_ ev_tstamp timeout) |
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238 | { |
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239 | int res; |
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240 | |
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241 | EV_RELEASE_CB; |
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242 | |
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243 | res = evsys_io_uring_enter (iouring_fd, iouring_to_submit, 1, |
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244 | timeout > EV_TS_CONST (0.) ? IORING_ENTER_GETEVENTS : 0, 0, 0); |
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245 | |
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246 | assert (("libev: io_uring_enter did not consume all sqes", (res < 0 || res == iouring_to_submit))); |
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247 | |
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248 | iouring_to_submit = 0; |
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249 | |
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250 | EV_ACQUIRE_CB; |
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251 | |
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252 | return res; |
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253 | } |
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254 | |
233 | static |
255 | static |
234 | struct io_uring_sqe * |
256 | struct io_uring_sqe * |
235 | iouring_sqe_get (EV_P) |
257 | iouring_sqe_get (EV_P) |
236 | { |
258 | { |
237 | unsigned tail = EV_SQ_VAR (tail); |
259 | unsigned tail = EV_SQ_VAR (tail); |
238 | |
260 | |
239 | if (tail + 1 - EV_SQ_VAR (head) > EV_SQ_VAR (ring_entries)) |
261 | while (ecb_expect_false (tail + 1 - EV_SQ_VAR (head) > EV_SQ_VAR (ring_entries))) |
240 | { |
262 | { |
241 | /* queue full, flush */ |
263 | /* queue full, need to flush */ |
242 | evsys_io_uring_enter (iouring_fd, iouring_to_submit, 0, 0, 0, 0); |
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243 | iouring_to_submit = 0; |
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244 | } |
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245 | |
264 | |
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265 | int res = iouring_enter (EV_A_ EV_TS_CONST (0.)); |
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266 | |
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267 | /* io_uring_enter might fail with EBUSY and won't submit anything */ |
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268 | /* unfortunately, we can't handle this at the moment */ |
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269 | |
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270 | if (res < 0 && errno == EBUSY) |
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271 | //TODO |
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272 | ev_syserr ("(libev) io_uring_enter could not clear sq"); |
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273 | else |
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274 | break; |
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275 | |
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276 | /* iouring_poll should have done ECB_MEMORY_FENCE_ACQUIRE */ |
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277 | } |
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278 | |
246 | assert (("libev: io_uring queue full after flush", tail + 1 - EV_SQ_VAR (head) <= EV_SQ_VAR (ring_entries))); |
279 | /*assert (("libev: io_uring queue full after flush", tail + 1 - EV_SQ_VAR (head) <= EV_SQ_VAR (ring_entries)));*/ |
247 | |
280 | |
248 | return EV_SQES + (tail & EV_SQ_VAR (ring_mask)); |
281 | return EV_SQES + (tail & EV_SQ_VAR (ring_mask)); |
249 | } |
282 | } |
250 | |
283 | |
251 | inline_size |
284 | inline_size |
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598 | iouring_tfd_update (EV_A_ timeout); |
631 | iouring_tfd_update (EV_A_ timeout); |
599 | |
632 | |
600 | /* only enter the kernel if we have something to submit, or we need to wait */ |
633 | /* only enter the kernel if we have something to submit, or we need to wait */ |
601 | if (timeout || iouring_to_submit) |
634 | if (timeout || iouring_to_submit) |
602 | { |
635 | { |
603 | int res; |
636 | int res = iouring_enter (EV_A_ timeout); |
604 | |
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605 | EV_RELEASE_CB; |
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606 | |
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607 | res = evsys_io_uring_enter (iouring_fd, iouring_to_submit, 1, |
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608 | timeout > EV_TS_CONST (0.) ? IORING_ENTER_GETEVENTS : 0, 0, 0); |
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609 | iouring_to_submit = 0; |
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610 | |
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611 | EV_ACQUIRE_CB; |
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612 | |
637 | |
613 | if (ecb_expect_false (res < 0)) |
638 | if (ecb_expect_false (res < 0)) |
614 | if (errno == EINTR) |
639 | if (errno == EINTR) |
615 | /* ignore */; |
640 | /* ignore */; |
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641 | else if (errno == EBUSY) |
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642 | /* cq full, cannot submit - should be rare because we flush the cq first, so simply ignore */; |
616 | else |
643 | else |
617 | ev_syserr ("(libev) iouring setup"); |
644 | ev_syserr ("(libev) iouring setup"); |
618 | else |
645 | else |
619 | iouring_handle_cq (EV_A); |
646 | iouring_handle_cq (EV_A); |
620 | } |
647 | } |