Basic conversion ensuring async_data is allocated off the prep path. Adds a basic alloc cache as well, as passthrough IO can be quite high in rate. Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> --- include/linux/io_uring_types.h | 1 + io_uring/io_uring.c | 3 ++ io_uring/opdef.c | 1 - io_uring/uring_cmd.c | 77 ++++++++++++++++++++++++---------- io_uring/uring_cmd.h | 10 ++++- 5 files changed, 69 insertions(+), 23 deletions(-) diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h index 2ba8676f83cc..e3ec84c43f1a 100644 --- a/include/linux/io_uring_types.h +++ b/include/linux/io_uring_types.h @@ -301,6 +301,7 @@ struct io_ring_ctx { struct io_alloc_cache apoll_cache; struct io_alloc_cache netmsg_cache; struct io_alloc_cache rw_cache; + struct io_alloc_cache uring_cache; /* * Any cancelable uring_cmd is added to this list in diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index cc8ce830ff4b..e2b9b00eedef 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -310,6 +310,8 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) sizeof(struct io_async_msghdr)); io_alloc_cache_init(&ctx->rw_cache, IO_ALLOC_CACHE_MAX, sizeof(struct io_async_rw)); + io_alloc_cache_init(&ctx->uring_cache, IO_ALLOC_CACHE_MAX, + sizeof(struct uring_cache)); io_futex_cache_init(ctx); init_completion(&ctx->ref_comp); xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); @@ -2901,6 +2903,7 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx) io_alloc_cache_free(&ctx->apoll_cache, io_apoll_cache_free); io_alloc_cache_free(&ctx->netmsg_cache, io_netmsg_cache_free); io_alloc_cache_free(&ctx->rw_cache, io_rw_cache_free); + io_alloc_cache_free(&ctx->uring_cache, io_uring_cache_free); io_futex_cache_free(ctx); io_destroy_buffers(ctx); mutex_unlock(&ctx->uring_lock); diff --git a/io_uring/opdef.c b/io_uring/opdef.c index 065c92c57878..4c0e9688a159 100644 --- a/io_uring/opdef.c +++ b/io_uring/opdef.c @@ -677,7 +677,6 @@ const struct io_cold_def io_cold_defs[] = { [IORING_OP_URING_CMD] = { .name = "URING_CMD", .async_size = 2 * sizeof(struct io_uring_sqe), - .prep_async = io_uring_cmd_prep_async, }, [IORING_OP_SEND_ZC] = { .name = "SEND_ZC", diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c index 4614ce734fee..9bd0ba87553f 100644 --- a/io_uring/uring_cmd.c +++ b/io_uring/uring_cmd.c @@ -14,6 +14,38 @@ #include "rsrc.h" #include "uring_cmd.h" +static struct uring_cache *io_uring_async_get(struct io_kiocb *req) +{ + struct io_ring_ctx *ctx = req->ctx; + struct io_cache_entry *entry; + struct uring_cache *cache; + + entry = io_alloc_cache_get(&ctx->uring_cache); + if (entry) { + cache = container_of(entry, struct uring_cache, cache); + req->flags |= REQ_F_ASYNC_DATA; + req->async_data = cache; + return cache; + } + if (!io_alloc_async_data(req)) + return req->async_data; + return NULL; +} + +static void io_req_uring_cleanup(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); + struct uring_cache *cache = req->async_data; + + if (issue_flags & IO_URING_F_UNLOCKED) + return; + if (io_alloc_cache_put(&req->ctx->uring_cache, &cache->cache)) { + ioucmd->sqe = NULL; + req->async_data = NULL; + req->flags &= ~REQ_F_ASYNC_DATA; + } +} + bool io_uring_try_cancel_uring_cmd(struct io_ring_ctx *ctx, struct task_struct *task, bool cancel_all) { @@ -128,6 +160,7 @@ void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2, io_req_set_res(req, ret, 0); if (req->ctx->flags & IORING_SETUP_CQE32) io_req_set_cqe32_extra(req, res2, 0); + io_req_uring_cleanup(req, issue_flags); if (req->ctx->flags & IORING_SETUP_IOPOLL) { /* order with io_iopoll_req_issued() checking ->iopoll_complete */ smp_store_release(&req->iopoll_completed, 1); @@ -142,13 +175,19 @@ void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2, } EXPORT_SYMBOL_GPL(io_uring_cmd_done); -int io_uring_cmd_prep_async(struct io_kiocb *req) +static int io_uring_cmd_prep_setup(struct io_kiocb *req, + const struct io_uring_sqe *sqe) { struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); + struct uring_cache *cache; - memcpy(req->async_data, ioucmd->sqe, uring_sqe_size(req->ctx)); - ioucmd->sqe = req->async_data; - return 0; + cache = io_uring_async_get(req); + if (cache) { + memcpy(cache->sqes, sqe, uring_sqe_size(req->ctx)); + ioucmd->sqe = req->async_data; + return 0; + } + return -ENOMEM; } int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) @@ -173,9 +212,9 @@ int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) req->imu = ctx->user_bufs[index]; io_req_set_rsrc_node(req, ctx, 0); } - ioucmd->sqe = sqe; ioucmd->cmd_op = READ_ONCE(sqe->cmd_op); - return 0; + + return io_uring_cmd_prep_setup(req, sqe); } int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags) @@ -206,23 +245,14 @@ int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags) } ret = file->f_op->uring_cmd(ioucmd, issue_flags); - if (ret == -EAGAIN) { - if (!req_has_async_data(req)) { - if (io_alloc_async_data(req)) - return -ENOMEM; - io_uring_cmd_prep_async(req); - } - return -EAGAIN; - } - - if (ret != -EIOCBQUEUED) { - if (ret < 0) - req_set_fail(req); - io_req_set_res(req, ret, 0); + if (ret == -EAGAIN || ret == -EIOCBQUEUED) return ret; - } - return IOU_ISSUE_SKIP_COMPLETE; + if (ret < 0) + req_set_fail(req); + io_req_uring_cleanup(req, issue_flags); + io_req_set_res(req, ret, 0); + return ret; } int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, @@ -311,3 +341,8 @@ int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags) } EXPORT_SYMBOL_GPL(io_uring_cmd_sock); #endif + +void io_uring_cache_free(struct io_cache_entry *entry) +{ + kfree(container_of(entry, struct uring_cache, cache)); +} diff --git a/io_uring/uring_cmd.h b/io_uring/uring_cmd.h index 7356bf9aa655..b0ccff7091ee 100644 --- a/io_uring/uring_cmd.h +++ b/io_uring/uring_cmd.h @@ -1,8 +1,16 @@ // SPDX-License-Identifier: GPL-2.0 +struct uring_cache { + union { + struct io_cache_entry cache; + struct io_uring_sqe sqes[2]; + }; +}; + int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags); int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); int io_uring_cmd_prep_async(struct io_kiocb *req); +void io_uring_cache_free(struct io_cache_entry *entry); bool io_uring_try_cancel_uring_cmd(struct io_ring_ctx *ctx, - struct task_struct *task, bool cancel_all); \ No newline at end of file + struct task_struct *task, bool cancel_all); -- 2.43.0