From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 80723C7EE22 for ; Tue, 2 May 2023 16:54:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234383AbjEBQyQ (ORCPT ); Tue, 2 May 2023 12:54:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40224 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234388AbjEBQyM (ORCPT ); Tue, 2 May 2023 12:54:12 -0400 Received: from 66-220-144-178.mail-mxout.facebook.com (66-220-144-178.mail-mxout.facebook.com [66.220.144.178]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B295735A5 for ; Tue, 2 May 2023 09:54:03 -0700 (PDT) Received: by devbig1114.prn1.facebook.com (Postfix, from userid 425415) id 313114CF6CC6; Tue, 2 May 2023 09:53:47 -0700 (PDT) From: Stefan Roesch To: io-uring@vger.kernel.org, kernel-team@fb.com Cc: shr@devkernel.io, axboe@kernel.dk, ammarfaizi2@gnuweeb.org, Jakub Kicinski Subject: [PATCH v12 4/5] io_uring: add register/unregister napi function Date: Tue, 2 May 2023 09:53:31 -0700 Message-Id: <20230502165332.2075091-5-shr@devkernel.io> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230502165332.2075091-1-shr@devkernel.io> References: <20230502165332.2075091-1-shr@devkernel.io> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org This adds an api to register and unregister the napi for io-uring. If the arg value is specified when unregistering, the current napi setting for the busy poll timeout is copied into the user structure. If this is not required, NULL can be passed as the arg value. Signed-off-by: Stefan Roesch Acked-by: Jakub Kicinski --- include/uapi/linux/io_uring.h | 11 ++++++++ io_uring/io_uring.c | 9 +++++++ io_uring/napi.c | 48 +++++++++++++++++++++++++++++++++++ io_uring/napi.h | 13 ++++++++++ 4 files changed, 81 insertions(+) diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.= h index 0716cb17e436..278c1a9de78c 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -523,6 +523,10 @@ enum { /* register a range of fixed file slots for automatic slot allocation *= / IORING_REGISTER_FILE_ALLOC_RANGE =3D 25, =20 + /* set/clear busy poll settings */ + IORING_REGISTER_NAPI =3D 26, + IORING_UNREGISTER_NAPI =3D 27, + /* this goes last */ IORING_REGISTER_LAST, =20 @@ -649,6 +653,13 @@ struct io_uring_buf_reg { __u64 resv[3]; }; =20 +/* argument for IORING_(UN)REGISTER_NAPI */ +struct io_uring_napi { + __u32 busy_poll_to; + __u32 pad; + __u64 resv; +}; + /* * io_uring_restriction->opcode values */ diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index f06175b36b41..66e4591fbe2b 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -4405,6 +4405,15 @@ static int __io_uring_register(struct io_ring_ctx = *ctx, unsigned opcode, break; ret =3D io_register_file_alloc_range(ctx, arg); break; + case IORING_REGISTER_NAPI: + ret =3D -EINVAL; + if (!arg) + break; + ret =3D io_register_napi(ctx, arg); + break; + case IORING_UNREGISTER_NAPI: + ret =3D io_unregister_napi(ctx, arg); + break; default: ret =3D -EINVAL; break; diff --git a/io_uring/napi.c b/io_uring/napi.c index 491d028e8146..fa531949fc6f 100644 --- a/io_uring/napi.c +++ b/io_uring/napi.c @@ -212,6 +212,54 @@ void io_napi_free(struct io_ring_ctx *ctx) spin_unlock(&ctx->napi_lock); } =20 +/* + * io_napi_register() - Register napi with io-uring + * @ctx: pointer to io-uring context structure + * @arg: pointer to io_uring_napi structure + * + * Register napi in the io-uring context. + */ +int io_register_napi(struct io_ring_ctx *ctx, void __user *arg) +{ + const struct io_uring_napi curr =3D { + .busy_poll_to =3D ctx->napi_busy_poll_to, + }; + struct io_uring_napi napi; + + if (copy_from_user(&napi, arg, sizeof(napi))) + return -EFAULT; + if (napi.pad || napi.resv) + return -EINVAL; + + WRITE_ONCE(ctx->napi_busy_poll_to, napi.busy_poll_to); + + if (copy_to_user(arg, &curr, sizeof(curr))) + return -EFAULT; + + return 0; +} + +/* + * io_napi_unregister() - Unregister napi with io-uring + * @ctx: pointer to io-uring context structure + * @arg: pointer to io_uring_napi structure + * + * Unregister napi. If arg has been specified copy the busy poll timeout= and + * prefer busy poll setting to the passed in structure. + */ +int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg) +{ + const struct io_uring_napi curr =3D { + .busy_poll_to =3D ctx->napi_busy_poll_to, + }; + + if (arg && copy_to_user(arg, &curr, sizeof(curr))) + return -EFAULT; + + WRITE_ONCE(ctx->napi_busy_poll_to, 0); + return 0; +} + /* * __io_napi_adjust_timeout() - Add napi id to the busy poll list * @ctx: pointer to io-uring context structure diff --git a/io_uring/napi.h b/io_uring/napi.h index 0484dfd9a396..b5e93b3777c0 100644 --- a/io_uring/napi.h +++ b/io_uring/napi.h @@ -12,6 +12,9 @@ void io_napi_init(struct io_ring_ctx *ctx); void io_napi_free(struct io_ring_ctx *ctx); =20 +int io_register_napi(struct io_ring_ctx *ctx, void __user *arg); +int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg); + void __io_napi_add(struct io_ring_ctx *ctx, struct file *file); =20 void __io_napi_adjust_timeout(struct io_ring_ctx *ctx, @@ -67,6 +70,16 @@ static inline void io_napi_free(struct io_ring_ctx *ct= x) { } =20 +static inline int io_register_napi(struct io_ring_ctx *ctx, void __user = *arg) +{ + return -EOPNOTSUPP; +} + +static inline int io_unregister_napi(struct io_ring_ctx *ctx, void __use= r *arg) +{ + return -EOPNOTSUPP; +} + static inline bool io_napi(struct io_ring_ctx *ctx) { return false; --=20 2.39.1