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 314C0C433F5 for ; Mon, 25 Apr 2022 18:26:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244396AbiDYS3O (ORCPT ); Mon, 25 Apr 2022 14:29:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53990 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244421AbiDYS3L (ORCPT ); Mon, 25 Apr 2022 14:29:11 -0400 Received: from mx0b-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9BD6927B1A for ; Mon, 25 Apr 2022 11:26:04 -0700 (PDT) Received: from pps.filterd (m0109331.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 23PHP6Xk005303 for ; Mon, 25 Apr 2022 11:26:03 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=qjQT4TdGjYQP+fFIUJysux2Jl90fDRSvqrS2tPCEO04=; b=GDhEtA7GXgSc2FOdMQgDbfj1EIqUdKPmt08O9c+9BMMVvyNLtSkwcr/GLi/YghbYdcEV pPHd43t8PDXhIlvQYTAu9fTsibrI/XCfHM4sSKL4GtrWy3rPsTAgnS5B0xUm/hsB1PyU HWnUiGNUabHFT3Akl6SxhCy9EJivLORc3TY= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3fmf9puxy0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Mon, 25 Apr 2022 11:26:03 -0700 Received: from twshared16483.05.ash9.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:83::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 25 Apr 2022 11:26:02 -0700 Received: by devvm225.atn0.facebook.com (Postfix, from userid 425415) id 3E5E8E1F2A5F; Mon, 25 Apr 2022 11:25:41 -0700 (PDT) From: Stefan Roesch To: , , CC: , Subject: [PATCH v3 06/12] io_uring: modify io_get_cqe for CQE32 Date: Mon, 25 Apr 2022 11:25:24 -0700 Message-ID: <20220425182530.2442911-7-shr@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220425182530.2442911-1-shr@fb.com> References: <20220425182530.2442911-1-shr@fb.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-ORIG-GUID: AFF7RUE5XY2woM26kGF7hP0o1mQVNVYp X-Proofpoint-GUID: AFF7RUE5XY2woM26kGF7hP0o1mQVNVYp X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.858,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-04-25_10,2022-04-25_03,2022-02-23_01 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Modify accesses to the CQE array to take large CQE's into account. The index needs to be shifted by one for large CQE's. Signed-off-by: Stefan Roesch Signed-off-by: Jens Axboe --- fs/io_uring.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index f300130fd9f0..726238dc65dc 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -1909,8 +1909,12 @@ static noinline struct io_uring_cqe *__io_get_cqe(= struct io_ring_ctx *ctx) { struct io_rings *rings =3D ctx->rings; unsigned int off =3D ctx->cached_cq_tail & (ctx->cq_entries - 1); + unsigned int shift =3D 0; unsigned int free, queued, len; =20 + if (ctx->flags & IORING_SETUP_CQE32) + shift =3D 1; + /* userspace may cheat modifying the tail, be safe and do min */ queued =3D min(__io_cqring_events(ctx), ctx->cq_entries); free =3D ctx->cq_entries - queued; @@ -1922,15 +1926,26 @@ static noinline struct io_uring_cqe *__io_get_cqe= (struct io_ring_ctx *ctx) ctx->cached_cq_tail++; ctx->cqe_cached =3D &rings->cqes[off]; ctx->cqe_sentinel =3D ctx->cqe_cached + len; - return ctx->cqe_cached++; + ctx->cqe_cached++; + return &rings->cqes[off << shift]; } =20 static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) { if (likely(ctx->cqe_cached < ctx->cqe_sentinel)) { + struct io_uring_cqe *cqe =3D ctx->cqe_cached; + + if (ctx->flags & IORING_SETUP_CQE32) { + unsigned int off =3D ctx->cqe_cached - ctx->rings->cqes; + + cqe +=3D off; + } + ctx->cached_cq_tail++; - return ctx->cqe_cached++; + ctx->cqe_cached++; + return cqe; } + return __io_get_cqe(ctx); } =20 --=20 2.30.2