From patchwork Tue Jul 5 15:01:20 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Begunkov X-Patchwork-Id: 12906711 X-Patchwork-Delegate: kuba@kernel.org 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 E5114C433EF for ; Tue, 5 Jul 2022 15:04:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232626AbiGEPEf (ORCPT ); Tue, 5 Jul 2022 11:04:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54440 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232933AbiGEPCg (ORCPT ); Tue, 5 Jul 2022 11:02:36 -0400 Received: from mail-wm1-x32a.google.com (mail-wm1-x32a.google.com [IPv6:2a00:1450:4864:20::32a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 803C61572F; Tue, 5 Jul 2022 08:02:14 -0700 (PDT) Received: by mail-wm1-x32a.google.com with SMTP id k129so7229512wme.0; Tue, 05 Jul 2022 08:02:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=QayDVb1TKX4nQ32atr/TNQ1V8pDXQwsZmBz0HTUXHx0=; b=UWMB+llED/MEE1En5HIuhSQzeryDHrKYY2Oa6b+KhkqzdKYypx6Kypn4Wby2ccgM7F UZRh74HoA0ltXLlK8BIMlhaJ+EUzL0qamQ52hZCAQNXm7tI0KehlCywyGmqJ4wlhDgJf 3awMgLs2eGkhY721CEm4oJs0m4z6M2stAlMl/wqIk8Fgo+v4dtt1um0c/+P4mK2e916l LzQIoapR4enyXXfP9Ixud/7yghoL+wi71/NQq/cWxYrt8o/DV9dg27Xomk/+1RC4hAQv wmvLWghSzEBwZpi0Hnx7Ln31Z1n7+/CKWMW1qEilJ9xcRUr1S/fhWpKwegJ6P3eMhAQU Fd3Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=QayDVb1TKX4nQ32atr/TNQ1V8pDXQwsZmBz0HTUXHx0=; b=u+orRW/lWpkCIvSLZVgIeWqhnkCH81yVIka2Mluk7mNX+joF6WoGH5VkebvVNrYJmn YH/x2Vl3J0xBW5ONoru7nfxVqmK7BaLRrlo+TUhovttFNH0j1Tf3Nre82YdtZzslP+ff gnIf7tN8Fnb5wFWbOv+8XrRJlfPJSyw5n+7Ue1Sp5g7cWA6uGPopA1oDCVzXJw2GEKVm xGQGtsBj/wvZGKa/Qc4yDeOSH3YRJRSgAR3n+01TCYowJKREUnkaeR0ll/M+8hvVMXYS vhe95NHxZ49rFkD7Bz+gL/enyqwKbqbscYm/1kazYeOJw6yJ/ILFVb6cRhyJT7Z97mNI sxkA== X-Gm-Message-State: AJIora8ea1dtBElIRuezRKIFFRgqd2IWxECJoeET9djF24aOALSgAXsw ap0jYWiBtaj/BniKBcp5hD/KYaUX/fGVVA== X-Google-Smtp-Source: AGRyM1s5PtBo8NsQvmSVPotWDsA2JqWeU6dcxcJtAw47i0CUV/9f8oeYLKjcrAhRTaov5q7+/AaP9g== X-Received: by 2002:a05:600c:a42:b0:39c:9086:8a34 with SMTP id c2-20020a05600c0a4200b0039c90868a34mr39290063wmq.169.1657033332623; Tue, 05 Jul 2022 08:02:12 -0700 (PDT) Received: from 127.0.0.1localhost (188.28.125.106.threembb.co.uk. [188.28.125.106]) by smtp.gmail.com with ESMTPSA id k27-20020adfd23b000000b0021d728d687asm2518200wrh.36.2022.07.05.08.02.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Jul 2022 08:02:12 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: "David S . Miller" , Jakub Kicinski , Jonathan Lemon , Willem de Bruijn , Jens Axboe , David Ahern , kernel-team@fb.com, Pavel Begunkov Subject: [PATCH net-next v3 20/25] io_uring: add rsrc referencing for notifiers Date: Tue, 5 Jul 2022 16:01:20 +0100 Message-Id: <77556e7ac0d76a760c3a3f739fb2d177853e76c0.1656318994.git.asml.silence@gmail.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org In preparation to zerocopy sends with fixed buffers make notifiers to reference the rsrc node to protect the used fixed buffers. We can't just grab it for a send request as notifiers can likely outlive requests that used it. Signed-off-by: Pavel Begunkov --- io_uring/notif.c | 5 +++++ io_uring/notif.h | 1 + io_uring/rsrc.h | 12 +++++++++--- 3 files changed, 15 insertions(+), 3 deletions(-) diff --git a/io_uring/notif.c b/io_uring/notif.c index 0a03d04c010b..a53acdda9ec0 100644 --- a/io_uring/notif.c +++ b/io_uring/notif.c @@ -7,10 +7,12 @@ #include "io_uring.h" #include "notif.h" +#include "rsrc.h" static void __io_notif_complete_tw(struct callback_head *cb) { struct io_notif *notif = container_of(cb, struct io_notif, task_work); + struct io_rsrc_node *rsrc_node = notif->rsrc_node; struct io_ring_ctx *ctx = notif->ctx; struct mmpin *mmp = ¬if->uarg.mmp; @@ -31,6 +33,7 @@ static void __io_notif_complete_tw(struct callback_head *cb) ctx->notif_locked_nr++; io_cq_unlock_post(ctx); + io_rsrc_put_node(rsrc_node, 1); percpu_ref_put(&ctx->refs); } @@ -125,6 +128,8 @@ struct io_notif *io_alloc_notif(struct io_ring_ctx *ctx, /* master ref owned by io_notif_slot, will be dropped on flush */ refcount_set(¬if->uarg.refcnt, 1); percpu_ref_get(&ctx->refs); + notif->rsrc_node = ctx->rsrc_node; + io_charge_rsrc_node(ctx); return notif; } diff --git a/io_uring/notif.h b/io_uring/notif.h index 6dde39c6afbe..00efe164bdc4 100644 --- a/io_uring/notif.h +++ b/io_uring/notif.h @@ -11,6 +11,7 @@ struct io_notif { struct ubuf_info uarg; struct io_ring_ctx *ctx; + struct io_rsrc_node *rsrc_node; /* complete via tw if ->task is non-NULL, fallback to wq otherwise */ struct task_struct *task; diff --git a/io_uring/rsrc.h b/io_uring/rsrc.h index 87f58315b247..af342fd239d0 100644 --- a/io_uring/rsrc.h +++ b/io_uring/rsrc.h @@ -135,6 +135,13 @@ static inline void io_req_put_rsrc_locked(struct io_kiocb *req, } } +static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx) +{ + ctx->rsrc_cached_refs--; + if (unlikely(ctx->rsrc_cached_refs < 0)) + io_rsrc_refs_refill(ctx); +} + static inline void io_req_set_rsrc_node(struct io_kiocb *req, struct io_ring_ctx *ctx, unsigned int issue_flags) @@ -144,9 +151,8 @@ static inline void io_req_set_rsrc_node(struct io_kiocb *req, if (!(issue_flags & IO_URING_F_UNLOCKED)) { lockdep_assert_held(&ctx->uring_lock); - ctx->rsrc_cached_refs--; - if (unlikely(ctx->rsrc_cached_refs < 0)) - io_rsrc_refs_refill(ctx); + + io_charge_rsrc_node(ctx); } else { percpu_ref_get(&req->rsrc_node->refs); }