From patchwork Sat Sep 24 23:21:33 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adit Ranadive X-Patchwork-Id: 674444 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3shRB15g15z9sD6 for ; Sun, 25 Sep 2016 09:23:37 +1000 (AEST) Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=onevmw.onmicrosoft.com header.i=@onevmw.onmicrosoft.com header.b=a+AXjUsp; dkim-atps=neutral Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936338AbcIXXXa (ORCPT ); Sat, 24 Sep 2016 19:23:30 -0400 Received: from ex13-edg-ou-002.vmware.com ([208.91.0.190]:3087 "EHLO EX13-EDG-OU-002.vmware.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1033024AbcIXXWq (ORCPT ); Sat, 24 Sep 2016 19:22:46 -0400 Received: from sc9-mailhost2.vmware.com (10.113.161.72) by EX13-EDG-OU-002.vmware.com (10.113.208.156) with Microsoft SMTP Server id 15.0.1156.6; Sat, 24 Sep 2016 16:22:22 -0700 Received: from EX13-CAS-010.vmware.com (smtp-inbound.vmware.com [10.113.191.62]) by sc9-mailhost2.vmware.com (Postfix) with ESMTP id DCC47B031E; Sat, 24 Sep 2016 16:22:45 -0700 (PDT) Received: from EX13-CAS-005.vmware.com (10.113.191.55) by EX13-MBX-001.vmware.com (10.113.191.21) with Microsoft SMTP Server (TLS) id 15.0.1156.6; Sat, 24 Sep 2016 16:22:32 -0700 Received: from NAM03-CO1-obe.outbound.protection.outlook.com (10.113.170.11) by EX13-CAS-005.vmware.com (10.113.191.55) with Microsoft SMTP Server (TLS) id 15.0.1156.6 via Frontend Transport; Sat, 24 Sep 2016 16:22:32 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=onevmw.onmicrosoft.com; s=selector1-vmware-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=A6T+Tj1ZlFuU+EmMiQxQozEBDx62dLxRVkzwkNc6jWA=; b=a+AXjUspHajNzBiZznuMmhpdXJj4J/+J+MxWUW9umx+67GKs0WHIFW756r9CtJdylaBaKOqAbR+FlOx68eT8RCAg7Z1kb5eupVhogrdUEZb5Q6RWdw2Vi2ivBUZJOPmhV3UjF68jbAvIlKxPoixr2h13gJKWB6uGfqJb1+tn2GM= Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=aditr@vmware.com; Received: from promb-2s-dhcp95-136.eng.vmware.com (208.91.1.34) by CO2PR0501MB837.namprd05.prod.outlook.com (10.141.244.147) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.639.2; Sat, 24 Sep 2016 23:22:21 +0000 From: Adit Ranadive To: , , CC: Adit Ranadive , , , , , , Subject: [PATCH v5 09/16] IB/pvrdma: Add support for Completion Queues Date: Sat, 24 Sep 2016 16:21:33 -0700 Message-ID: <4e4b66c188ce96b6435317f329b8dc7cc7d9a3b3.1474759181.git.aditr@vmware.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: MIME-Version: 1.0 X-Originating-IP: [208.91.1.34] X-ClientProxiedBy: CY1PR18CA0027.namprd18.prod.outlook.com (10.163.31.37) To CO2PR0501MB837.namprd05.prod.outlook.com (10.141.244.147) X-MS-Office365-Filtering-Correlation-Id: 062a2ea5-639f-4f7a-fb64-08d3e4d1a345 X-Microsoft-Exchange-Diagnostics: 1; CO2PR0501MB837; 2:q3D3v2rBO3+k93bBwlC3abwKPfK1tJR3xg7zrdW9UxG5Kg0ox6xnBm3O+SvasOB8mq8ChWW/0FUAh+Vw4kTPB/UPLSuzRO3pc2pIlTed/7/JqBqVPb2ebQfMN5mwIN2Yij6428r0nowA6o0h70cnQvVfgqfcdEy8YOg4fbP9JKF8kbNdzf2Y6YOS1oSq/3jn; 3:NJT7H2GXz/ik62nyTOrwnNsDGoBlyzQSWxDA43Ykzftc4wBPk58M1TaTk4I0QuvOsMvYIDu46hcFn/nJ30QtXxCUnPlARAY34JSNqJOyS//2O12hAptFpy/24q26wUkv X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:;SRVR:CO2PR0501MB837; X-Microsoft-Exchange-Diagnostics: 1; CO2PR0501MB837; 25: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 X-LD-Processed: b39138ca-3cee-4b4a-a4d6-cd83d9dd62f0,ExtAddr X-Microsoft-Exchange-Diagnostics: 1; CO2PR0501MB837; 31:alKmbPBWRo1AE3geeO34qpvFB+Gvn8KdH0GhYa4JkNTkTE6XkpcNOk68906oGtGCTyW5+8kHmXn8hVFxG1Hkb6+n1UZ3I/nRKb68FFlQRDmWe9BaOu/9jLXtSlGFSm6t4zB4x/vK+RYgm7Ks6eNtpizGLm2UhdTWs4lSr3MCPBMuSl0Ze5VVtF9Hls2X3QDC2xkA1WZwmQ57pucQGxYb5BQ37NO5CJACA+aLL+3le/I=; 20: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 X-Microsoft-Antispam-PRVS: X-Exchange-Antispam-Report-Test: UriScan:(250305191791016)(61668805478150)(22074186197030)(146099531331640); X-Exchange-Antispam-Report-CFA-Test: BCL:0; PCL:0; RULEID:(6040176)(601004)(2401047)(8121501046)(5005006)(3002001)(10201501046); SRVR:CO2PR0501MB837; BCL:0; PCL:0; RULEID:; SRVR:CO2PR0501MB837; X-Microsoft-Exchange-Diagnostics: 1; CO2PR0501MB837; 4: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 X-Forefront-PRVS: 0075CB064E X-Forefront-Antispam-Report: SFV:NSPM; SFS:(10009020)(4630300001)(6009001)(7916002)(189002)(199003)(107886002)(77096005)(97736004)(4326007)(106356001)(105586002)(15975445007)(76176999)(586003)(6862003)(118296001)(50986999)(2950100002)(33646002)(6116002)(5001770100001)(19580395003)(5660300001)(19580405001)(92566002)(2906002)(3846002)(47776003)(189998001)(50466002)(86362001)(48376002)(2201001)(81156014)(81166006)(101416001)(8676002)(50226002)(5003940100001)(36756003)(7736002)(7846002)(305945005)(229853001)(42186005)(68736007)(66066001)(4001430100002)(7099028)(2004002); DIR:OUT; SFP:1101; SCL:1; SRVR:CO2PR0501MB837; H:promb-2s-dhcp95-136.eng.vmware.com; FPR:; SPF:None; PTR:InfoNoRecords; MX:1; A:1; LANG:en; Received-SPF: None (EX13-EDG-OU-002.vmware.com: aditr@vmware.com does not designate permitted sender hosts) Received-SPF: None (protection.outlook.com: vmware.com does not designate permitted sender hosts) X-Microsoft-Exchange-Diagnostics: =?us-ascii?Q?1; CO2PR0501MB837; 23:bL/q33wk/tW96MmB5UC+B+49Ml942lSl0uaACgUh?= =?us-ascii?Q?4xarl15439iRsEElPNZuwzZMUu5HChv+IqDIc/JAZikT+tc8wSqBgQjp7sGt?= =?us-ascii?Q?YfZbE9EuInlfkdxwDiB9Bi8D2hbJL+fw5BI2WPY6BUh4ZVE9IcF9CN60Jy8O?= =?us-ascii?Q?rLKAjQmGaFhh2QCV5ykdfOgwMBlvU2OphfuFvhUfT3T1lPB7SPIp8m4610L6?= =?us-ascii?Q?M8Hh8BWWXcXboz/HsnnFpFdgUPN7RPLIe3clA9LiOvtMdb4dMx02b1I43ra5?= =?us-ascii?Q?5bbrYEeOnp/tOi0/p1u6kO1pWuJVASzefEj+rTgTSj4/D4L39xhbwCTjXZv+?= =?us-ascii?Q?/+Fjhn/9zqpoj2CMOwjF8f0Ne7v+1ohRY5MBKkpNtmyhCGdPO9J0ORBnP9S3?= =?us-ascii?Q?1dzBmuEHB8u14Ldh5tcYRpW+LqmojdWfTBzCfuoHGmyGvKJYLxLPtCjLseAN?= =?us-ascii?Q?6Fqo9O4sRVScsBKtGO2BTqMVkjZ6Jc8kEsMlpRNNKBqHqyURv7OEy09g46xn?= =?us-ascii?Q?zD6JcgNVWjthkaq7fTucJ18cqMtuotsfNwkf8jVAz17fGAZyofbUFhQE7b6L?= =?us-ascii?Q?uNB+3e208Pm1HApExlZepbeAfe6StymHjqtrXWbAGfWTsUNDiawh4Sb2Z9/o?= =?us-ascii?Q?ez1oUTCeMDLCXFjWLe/2fI9pEhlIpj4F/I0NZRjlqA/WumfcgXrZSF3tTsHY?= =?us-ascii?Q?xr7Fqc/K2JF9hvh5cwUoLjnd0dhcvgQr55Z/RRiY1DOEoKoZjoFZm03RZdSU?= =?us-ascii?Q?2SXHcbn1/gRTrHnh5hEE66YRc3DLvvpEOjHh6j9vcL2KFT5ySQktSbhm2Lam?= =?us-ascii?Q?7Stkx4b+ar92Z8/xC186v1zfVjZA/ljkscDvng+lNfaPC1TIJx9DCJTBO9JF?= =?us-ascii?Q?JflgQ108cW6Kxr7sHJkqQmcL8CeLSW0uAOsZXNQ2zFkJm3KMys5n1SLFffMy?= =?us-ascii?Q?wCjnFsSX2biyrdSn+hxiB6MOGtFNJSj9yVWpgZyHo9DAGywGI3WM5ZpGy2hT?= =?us-ascii?Q?BFx/oBm9wEhZqCELtSrGzO+hKcuTjWOdCFWSUr5gnc0AjDkGZETsqmrkCXBm?= =?us-ascii?Q?80lKmZAKHWEiZ9I9ahtgi9MNdUTY8VBAsBeKTPBIRZhB4KrGvb1xIqSlcvsD?= =?us-ascii?Q?FqbLvkQqSy1RTYPXtDjMNn1GZbvPsEa2JJVDXCK2bYpUETRBitPfDmangFDW?= =?us-ascii?Q?4p1a9AfxPE7WgH+h+a/Ez8T2/lGZ/SavGE8Mv4hfz744a9oUFgct5ipeBw?= =?us-ascii?Q?=3D=3D?= X-Microsoft-Exchange-Diagnostics: 1; CO2PR0501MB837; 6:PlRRocirs+iRzTTcSbu+oZhRnftX6TDbsyiFOiHTxx2L0hNiij7nGaYiJ70lMUnS5dIkFDmiZ0vJSRcl5C+s9+epGsjCrFW5HsUHXdmCr0g5VPSxpr5CYNlpL8JOd1jzTVdaG+Ll2XaMPZVRjKm2ZSdnw9rw60OEteIGNKh4nWnkc2242+BFIRTx69/f+PbuZNVyBJCVsQBkpdZXDLjZyz5WZ0S5eTStwfE+2xpEG0I3wF1bXh1XQlgbR/EUGLEeoy1DezDV4sm8Q64BkpCcmS+fHukPrdpvZNsSFc3ClVs=; 5:fr/7vJsxE8yzSRzQs85+VsPGPhC0EdHpqC5KRpX3wDuG4ZEhyIP1djz5r3xEA7GNrpp3ffsfJWlGt0dzVVoEOvkZ7yVWZQEoXM6N9U9J6lDLynmk0gvmSe6VgH6yRSDc7zrvxPXWZsIqp5nbL7hy6A==; 24:d8r7wzxFysg3POCYeAQD22Q51IG7noA5eW5mc35+2KCDGIQEWSzLVfqOHpV54h+0ficLBBrsERwlCvCqLyy2EjXGTDpLpVZy0btB+yUNbFQ=; 7:TzkZfW5CZuWWil6g6+nW46kgkUu26sKnzIL3tW+5SQEn94TmzTDJ2etvRqVx+zoUKT3XyRkWa9AsjF+rYALDLKRX6rvNQ2+HIIEfFYJN6dKD5NzSdKvd+3CFueMBlsPq61DmMUVgK05U39mCRCs1xaocHjMJHSzb9fqoml6JqQudY3ptwCwt1i9X4si/2k/cDVlHkU6Vj8Kci2vMgENiWmCH274SJIRv35pl+cxa1UXaNF7GouLvr/r8VBbE88EqNPoG8NR7JYD4VDR2UbuJC/ulVHwc1ZMcktJL2Y2mOVJDPWClzAmNWCTyjFoxvadp SpamDiagnosticOutput: 1:99 SpamDiagnosticMetadata: NSPM X-Microsoft-Exchange-Diagnostics: 1; CO2PR0501MB837; 20:f3OYt9EQROIn7OChQOu2n86miGrIeI2+rjmUwaCW0BPX8nYJCvM/IUzVYIl68tP6sZWZwrLR4IMICo1/DZKLZJMKhiWjoGf6lsi9p1mCfLEjhdgti0ozmjlWIWZnaYg8X0cj+X4tejbW4VZTaN9u/pMoKFJ1xg307wPThKpVKfw= X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Sep 2016 23:22:21.5592 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO2PR0501MB837 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This patch adds the support for creating and destroying completion queues on the paravirtual RDMA device. Reviewed-by: Yuval Shaia Reviewed-by: Jorgen Hansen Reviewed-by: George Zhang Reviewed-by: Aditya Sarwade Reviewed-by: Bryan Tan Signed-off-by: Adit Ranadive --- Changes v4->v5: - Updated include for headers in UAPI folder. - Changed from EINVAL to ENOMEM if atomic add fails. - Added error code if destroy cq command failed. - Update to pvrdma_cmd_post for creating/destroying CQ. Changes v3->v4: - Added a pvrdma_destroy_cq in the error path. - Renamed pvrdma_flush_cqe to _pvrdma_flush_cqe since we need a lock to be held while calling this. - Updated to use wrapper for UAR write for CQ. - Ensure that poll_cq does not return error values. Changes v2->v3: - Removed boolean from pvrdma_cmd_post. - Return -EAGAIN if qp retrieved from CQE is bogus. - Check for invalid index of ring. --- drivers/infiniband/hw/pvrdma/pvrdma_cq.c | 426 +++++++++++++++++++++++++++++++ 1 file changed, 426 insertions(+) create mode 100644 drivers/infiniband/hw/pvrdma/pvrdma_cq.c diff --git a/drivers/infiniband/hw/pvrdma/pvrdma_cq.c b/drivers/infiniband/hw/pvrdma/pvrdma_cq.c new file mode 100644 index 0000000..f26d4bc --- /dev/null +++ b/drivers/infiniband/hw/pvrdma/pvrdma_cq.c @@ -0,0 +1,426 @@ +/* + * Copyright (c) 2012-2016 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of EITHER the GNU General Public License + * version 2 as published by the Free Software Foundation or the BSD + * 2-Clause License. This program is distributed in the hope that it + * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED + * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. + * See the GNU General Public License version 2 for more details at + * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html. + * + * You should have received a copy of the GNU General Public License + * along with this program available in the file COPYING in the main + * directory of this source tree. + * + * The BSD 2-Clause License + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include +#include +#include +#include +#include +#include +#include + +#include "pvrdma.h" + +/** + * pvrdma_req_notify_cq - request notification for a completion queue + * @ibcq: the completion queue + * @notify_flags: notification flags + * + * @return: 0 for success. + */ +int pvrdma_req_notify_cq(struct ib_cq *ibcq, + enum ib_cq_notify_flags notify_flags) +{ + struct pvrdma_dev *dev = to_vdev(ibcq->device); + struct pvrdma_cq *cq = to_vcq(ibcq); + u32 val = cq->cq_handle; + + val |= (notify_flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ? + PVRDMA_UAR_CQ_ARM_SOL : PVRDMA_UAR_CQ_ARM; + + pvrdma_write_uar_cq(dev, val); + + return 0; +} + +/** + * pvrdma_create_cq - create completion queue + * @ibdev: the device + * @attr: completion queue attributes + * @context: user context + * @udata: user data + * + * @return: ib_cq completion queue pointer on success, + * otherwise returns negative errno. + */ +struct ib_cq *pvrdma_create_cq(struct ib_device *ibdev, + const struct ib_cq_init_attr *attr, + struct ib_ucontext *context, + struct ib_udata *udata) +{ + int entries = attr->cqe; + struct pvrdma_dev *dev = to_vdev(ibdev); + struct pvrdma_cq *cq; + int ret; + int npages; + unsigned long flags; + union pvrdma_cmd_req req; + union pvrdma_cmd_resp rsp; + struct pvrdma_cmd_create_cq *cmd = &req.create_cq; + struct pvrdma_cmd_create_cq_resp *resp = &rsp.create_cq_resp; + struct pvrdma_create_cq ucmd; + + BUILD_BUG_ON(sizeof(struct pvrdma_cqe) != 64); + + entries = roundup_pow_of_two(entries); + if (entries < 1 || entries > dev->dsr->caps.max_cqe) + return ERR_PTR(-EINVAL); + + if (!atomic_add_unless(&dev->num_cqs, 1, dev->dsr->caps.max_cq)) + return ERR_PTR(-ENOMEM); + + cq = kzalloc(sizeof(*cq), GFP_KERNEL); + if (!cq) { + atomic_dec(&dev->num_cqs); + return ERR_PTR(-ENOMEM); + } + + cq->ibcq.cqe = entries; + + if (context) { + if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) { + ret = -EFAULT; + goto err_cq; + } + + cq->umem = ib_umem_get(context, ucmd.buf_addr, ucmd.buf_size, + IB_ACCESS_LOCAL_WRITE, 1); + if (IS_ERR(cq->umem)) { + ret = PTR_ERR(cq->umem); + goto err_cq; + } + + npages = ib_umem_page_count(cq->umem); + } else { + cq->is_kernel = true; + + /* One extra page for shared ring state */ + npages = 1 + (entries * sizeof(struct pvrdma_cqe) + + PAGE_SIZE - 1) / PAGE_SIZE; + + /* Skip header page. */ + cq->offset = PAGE_SIZE; + } + + if (npages < 0 || npages > PVRDMA_PAGE_DIR_MAX_PAGES) { + dev_warn(&dev->pdev->dev, + "overflow pages in completion queue\n"); + ret = -EINVAL; + goto err_umem; + } + + ret = pvrdma_page_dir_init(dev, &cq->pdir, npages, cq->is_kernel); + if (ret) { + dev_warn(&dev->pdev->dev, + "could not allocate page directory\n"); + goto err_umem; + } + + /* Ring state is always the first page. Set in library for user cq. */ + if (cq->is_kernel) + cq->ring_state = cq->pdir.pages[0]; + else + pvrdma_page_dir_insert_umem(&cq->pdir, cq->umem, 0); + + atomic_set(&cq->refcnt, 1); + init_waitqueue_head(&cq->wait); + spin_lock_init(&cq->cq_lock); + + memset(cmd, 0, sizeof(*cmd)); + cmd->hdr.cmd = PVRDMA_CMD_CREATE_CQ; + cmd->nchunks = npages; + cmd->ctx_handle = (context) ? + (u64)to_vucontext(context)->ctx_handle : 0; + cmd->cqe = entries; + cmd->pdir_dma = cq->pdir.dir_dma; + ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_CQ_RESP); + if (ret < 0) { + dev_warn(&dev->pdev->dev, + "could not create completion queue, error: %d\n", ret); + goto err_page_dir; + } + + cq->ibcq.cqe = resp->cqe; + cq->cq_handle = resp->cq_handle; + spin_lock_irqsave(&dev->cq_tbl_lock, flags); + dev->cq_tbl[cq->cq_handle % dev->dsr->caps.max_cq] = cq; + spin_unlock_irqrestore(&dev->cq_tbl_lock, flags); + + if (context) { + cq->uar = &(to_vucontext(context)->uar); + + /* Copy udata back. */ + if (ib_copy_to_udata(udata, &cq->cq_handle, sizeof(__u32))) { + dev_warn(&dev->pdev->dev, + "failed to copy back udata\n"); + pvrdma_destroy_cq(&cq->ibcq); + return ERR_PTR(-EINVAL); + } + } + + return &cq->ibcq; + +err_page_dir: + pvrdma_page_dir_cleanup(dev, &cq->pdir); +err_umem: + if (context) + ib_umem_release(cq->umem); +err_cq: + atomic_dec(&dev->num_cqs); + kfree(cq); + + return ERR_PTR(ret); +} + +static void pvrdma_free_cq(struct pvrdma_dev *dev, struct pvrdma_cq *cq) +{ + atomic_dec(&cq->refcnt); + wait_event(cq->wait, !atomic_read(&cq->refcnt)); + + if (!cq->is_kernel) + ib_umem_release(cq->umem); + + pvrdma_page_dir_cleanup(dev, &cq->pdir); + kfree(cq); +} + +/** + * pvrdma_destroy_cq - destroy completion queue + * @cq: the completion queue to destroy. + * + * @return: 0 for success. + */ +int pvrdma_destroy_cq(struct ib_cq *cq) +{ + struct pvrdma_cq *vcq = to_vcq(cq); + union pvrdma_cmd_req req; + struct pvrdma_cmd_destroy_cq *cmd = &req.destroy_cq; + struct pvrdma_dev *dev = to_vdev(cq->device); + unsigned long flags; + int ret; + + memset(cmd, 0, sizeof(*cmd)); + cmd->hdr.cmd = PVRDMA_CMD_DESTROY_CQ; + cmd->cq_handle = vcq->cq_handle; + + ret = pvrdma_cmd_post(dev, &req, NULL, 0); + if (ret < 0) + dev_warn(&dev->pdev->dev, + "could not destroy completion queue, error: %d\n", + ret); + + /* free cq's resources */ + spin_lock_irqsave(&dev->cq_tbl_lock, flags); + dev->cq_tbl[vcq->cq_handle] = NULL; + spin_unlock_irqrestore(&dev->cq_tbl_lock, flags); + + pvrdma_free_cq(dev, vcq); + atomic_dec(&dev->num_cqs); + + return ret; +} + +/** + * pvrdma_modify_cq - modify the CQ moderation parameters + * @ibcq: the CQ to modify + * @cq_count: number of CQEs that will trigger an event + * @cq_period: max period of time in usec before triggering an event + * + * @return: -EOPNOTSUPP as CQ resize is not supported. + */ +int pvrdma_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period) +{ + return -EOPNOTSUPP; +} + +static inline struct pvrdma_cqe *get_cqe(struct pvrdma_cq *cq, int i) +{ + return (struct pvrdma_cqe *)pvrdma_page_dir_get_ptr( + &cq->pdir, + cq->offset + + sizeof(struct pvrdma_cqe) * i); +} + +void _pvrdma_flush_cqe(struct pvrdma_qp *qp, struct pvrdma_cq *cq) +{ + int head; + int has_data; + + if (!cq->is_kernel) + return; + + /* Lock held */ + has_data = pvrdma_idx_ring_has_data(&cq->ring_state->rx, + cq->ibcq.cqe, &head); + if (unlikely(has_data > 0)) { + int items; + int curr; + int tail = pvrdma_idx(&cq->ring_state->rx.prod_tail, + cq->ibcq.cqe); + struct pvrdma_cqe *cqe; + struct pvrdma_cqe *curr_cqe; + + items = (tail > head) ? (tail - head) : + (cq->ibcq.cqe - head + tail); + curr = --tail; + while (items-- > 0) { + if (curr < 0) + curr = cq->ibcq.cqe - 1; + if (tail < 0) + tail = cq->ibcq.cqe - 1; + curr_cqe = get_cqe(cq, curr); + if ((curr_cqe->qp & 0xFFFF) != qp->qp_handle) { + if (curr != tail) { + cqe = get_cqe(cq, tail); + *cqe = *curr_cqe; + } + tail--; + } else { + pvrdma_idx_ring_inc( + &cq->ring_state->rx.cons_head, + cq->ibcq.cqe); + } + curr--; + } + } +} + +static int pvrdma_poll_one(struct pvrdma_cq *cq, struct pvrdma_qp **cur_qp, + struct ib_wc *wc) +{ + struct pvrdma_dev *dev = to_vdev(cq->ibcq.device); + int has_data; + unsigned int head; + bool tried = false; + struct pvrdma_cqe *cqe; + +retry: + has_data = pvrdma_idx_ring_has_data(&cq->ring_state->rx, + cq->ibcq.cqe, &head); + if (has_data == 0) { + if (tried) + return -EAGAIN; + + pvrdma_write_uar_cq(dev, cq->cq_handle | PVRDMA_UAR_CQ_POLL); + + tried = true; + goto retry; + } else if (has_data == PVRDMA_INVALID_IDX) { + dev_err(&dev->pdev->dev, "CQ ring state invalid\n"); + return -EAGAIN; + } + + cqe = get_cqe(cq, head); + + /* Ensure cqe is valid. */ + rmb(); + if (dev->qp_tbl[cqe->qp & 0xffff]) + *cur_qp = (struct pvrdma_qp *)dev->qp_tbl[cqe->qp & 0xffff]; + else + return -EAGAIN; + + wc->opcode = pvrdma_wc_opcode_to_ib(cqe->opcode); + wc->status = pvrdma_wc_status_to_ib(cqe->status); + wc->wr_id = cqe->wr_id; + wc->qp = &(*cur_qp)->ibqp; + wc->byte_len = cqe->byte_len; + wc->ex.imm_data = cqe->imm_data; + wc->src_qp = cqe->src_qp; + wc->wc_flags = pvrdma_wc_flags_to_ib(cqe->wc_flags); + wc->pkey_index = cqe->pkey_index; + wc->slid = cqe->slid; + wc->sl = cqe->sl; + wc->dlid_path_bits = cqe->dlid_path_bits; + wc->port_num = cqe->port_num; + wc->vendor_err = 0; + + /* Update shared ring state */ + pvrdma_idx_ring_inc(&cq->ring_state->rx.cons_head, cq->ibcq.cqe); + + return 0; +} + +/** + * pvrdma_poll_cq - poll for work completion queue entries + * @ibcq: completion queue + * @num_entries: the maximum number of entries + * @entry: pointer to work completion array + * + * @return: number of polled completion entries + */ +int pvrdma_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc) +{ + struct pvrdma_cq *cq = to_vcq(ibcq); + struct pvrdma_qp *cur_qp = NULL; + unsigned long flags; + int npolled; + + if (num_entries < 1 || wc == NULL) + return 0; + + spin_lock_irqsave(&cq->cq_lock, flags); + for (npolled = 0; npolled < num_entries; ++npolled) { + if (pvrdma_poll_one(cq, &cur_qp, wc + npolled)) + break; + } + + spin_unlock_irqrestore(&cq->cq_lock, flags); + + /* Ensure we do not return errors from poll_cq */ + return npolled; +} + +/** + * pvrdma_resize_cq - resize CQ + * @ibcq: the completion queue + * @entries: CQ entries + * @udata: user data + * + * @return: -EOPNOTSUPP as CQ resize is not supported. + */ +int pvrdma_resize_cq(struct ib_cq *ibcq, int entries, struct ib_udata *udata) +{ + return -EOPNOTSUPP; +}