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GET /api/patches/113748/?format=api
{ "id": 113748, "url": "http://patches.dpdk.org/api/patches/113748/?format=api", "web_url": "http://patches.dpdk.org/project/dpdk/patch/20220706092401.36815-1-asaini@xilinx.com/", "project": { "id": 1, "url": "http://patches.dpdk.org/api/projects/1/?format=api", "name": "DPDK", "link_name": "dpdk", "list_id": "dev.dpdk.org", "list_email": "dev@dpdk.org", "web_url": "http://core.dpdk.org", "scm_url": "git://dpdk.org/dpdk", "webscm_url": "http://git.dpdk.org/dpdk", "list_archive_url": "https://inbox.dpdk.org/dev", "list_archive_url_format": "https://inbox.dpdk.org/dev/{}", "commit_url_format": "" }, "msgid": "<20220706092401.36815-1-asaini@xilinx.com>", "list_archive_url": "https://inbox.dpdk.org/dev/20220706092401.36815-1-asaini@xilinx.com", "date": "2022-07-06T09:24:01", "name": "vdpa/sfc: resolve race between libvhost and dev_conf", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": true, "hash": "9865ff56d4f6b97bac5d1405b41c694a351652da", "submitter": { "id": 2468, "url": "http://patches.dpdk.org/api/people/2468/?format=api", "name": "", "email": "abhimanyu.saini@xilinx.com" }, "delegate": { "id": 2642, "url": "http://patches.dpdk.org/api/users/2642/?format=api", "username": "mcoquelin", "first_name": "Maxime", "last_name": "Coquelin", "email": "maxime.coquelin@redhat.com" }, "mbox": "http://patches.dpdk.org/project/dpdk/patch/20220706092401.36815-1-asaini@xilinx.com/mbox/", "series": [ { "id": 23903, "url": "http://patches.dpdk.org/api/series/23903/?format=api", "web_url": "http://patches.dpdk.org/project/dpdk/list/?series=23903", "date": "2022-07-06T09:24:01", "name": "vdpa/sfc: resolve race between libvhost and dev_conf", "version": 1, "mbox": "http://patches.dpdk.org/series/23903/mbox/" } ], "comments": "http://patches.dpdk.org/api/patches/113748/comments/", "check": "fail", "checks": "http://patches.dpdk.org/api/patches/113748/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@inbox.dpdk.org", "Delivered-To": "patchwork@inbox.dpdk.org", "Received": [ "from mails.dpdk.org (mails.dpdk.org [217.70.189.124])\n\tby inbox.dpdk.org (Postfix) with ESMTP id EDB96A0540;\n\tWed, 6 Jul 2022 11:24:22 +0200 (CEST)", "from [217.70.189.124] (localhost [127.0.0.1])\n\tby mails.dpdk.org (Postfix) with ESMTP id 9C1BB40A7F;\n\tWed, 6 Jul 2022 11:24:22 +0200 (CEST)", "from NAM10-DM6-obe.outbound.protection.outlook.com\n (mail-dm6nam10on2055.outbound.protection.outlook.com [40.107.93.55])\n by mails.dpdk.org (Postfix) with ESMTP id 9731F40691\n for <dev@dpdk.org>; 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CTRY:US; LANG:en; SCL:1; SRV:;\n IPV:NLI; SFV:NSPM;\n H:mailrelay000000.14r1f435wfvunndds3vy4cdalc.xx.internal.cloudapp.net;\n PTR:InfoDomainNonexistent; CAT:NONE;\n SFS:(13230016)(4636009)(376002)(39860400002)(346002)(396003)(136003)(46966006)(36840700001)(2906002)(36860700001)(41300700001)(34020700004)(2616005)(6666004)(40480700001)(1076003)(82310400005)(316002)(36756003)(2876002)(426003)(54906003)(6916009)(7696005)(70206006)(8676002)(4326008)(9786002)(47076005)(478600001)(186003)(42882007)(83380400001)(336012)(82740400003)(81166007)(83170400001)(26005)(8936002)(5660300002)(102446001)(84790400001)(36900700001);\n DIR:OUT; SFP:1101;", "X-OriginatorOrg": "amd.com", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "06 Jul 2022 09:24:17.6594 (UTC)", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n df202e23-f65a-443c-bb99-08da5f314d0c", "X-MS-Exchange-CrossTenant-Id": "3dd8961f-e488-4e60-8e11-a82d994e183d", "X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp": "\n TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[20.83.241.18];\n Helo=[mailrelay000000.14r1f435wfvunndds3vy4cdalc.xx.internal.cloudapp.net]", "X-MS-Exchange-CrossTenant-AuthAs": "Internal", "X-MS-Exchange-CrossTenant-AuthSource": "\n TreatMessagesAsInternal-CO1NAM11FT051.eop-nam11.prod.protection.outlook.com", "X-MS-Exchange-CrossTenant-FromEntityHeader": "HybridOnPrem", "X-BeenThere": "dev@dpdk.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "DPDK patches and discussions <dev.dpdk.org>", "List-Unsubscribe": "<https://mails.dpdk.org/options/dev>,\n <mailto:dev-request@dpdk.org?subject=unsubscribe>", "List-Archive": "<http://mails.dpdk.org/archives/dev/>", "List-Post": "<mailto:dev@dpdk.org>", "List-Help": "<mailto:dev-request@dpdk.org?subject=help>", "List-Subscribe": "<https://mails.dpdk.org/listinfo/dev>,\n <mailto:dev-request@dpdk.org?subject=subscribe>", "Errors-To": "dev-bounces@dpdk.org" }, "content": "From: Abhimanyu Saini <absaini@amd.com>\n\nlibvhost calls dev_conf() before prosessing the\nVHOST_USER_SET_VRING_CALL message for the last VQ. So\nthis message is processed after dev_conf() returns.\n\nHowever, the dev_conf() function spawns a thread to set\nrte_vhost_host_notifier_ctrl() before returning control to\nlibvhost. This parallel thread in turn invokes get_notify_area().\nTo get the notify_area, the vdpa driver needs to query the HW and\nfor this query it needs an enabled VQ.\n\nBut at the same time libvhost is processing the last\nVHOST_USER_SET_VRING_CALL, and to do that it disables the last VQ.\n\nHence there is a race b/w the libvhost and the vdpa driver.\n\nTo resolve this race condition, query the HW and cache notify_area\ninside dev_conf() instead of doing it the parallel thread.\n\nSigned-off-by: Abhimanyu Saini <absaini@amd.com>\n---\n drivers/vdpa/sfc/sfc_vdpa_ops.c | 36 ++++++++++++++++++------------------\n drivers/vdpa/sfc/sfc_vdpa_ops.h | 1 +\n 2 files changed, 19 insertions(+), 18 deletions(-)", "diff": "diff --git a/drivers/vdpa/sfc/sfc_vdpa_ops.c b/drivers/vdpa/sfc/sfc_vdpa_ops.c\nindex 63aa52d..b84699d 100644\n--- a/drivers/vdpa/sfc/sfc_vdpa_ops.c\n+++ b/drivers/vdpa/sfc/sfc_vdpa_ops.c\n@@ -222,6 +222,7 @@\n sfc_vdpa_virtq_start(struct sfc_vdpa_ops_data *ops_data, int vq_num)\n {\n \tint rc;\n+\tuint32_t doorbell;\n \tefx_virtio_vq_t *vq;\n \tstruct sfc_vdpa_vring_info vring;\n \tefx_virtio_vq_cfg_t vq_cfg;\n@@ -270,22 +271,35 @@\n \t/* Start virtqueue */\n \trc = efx_virtio_qstart(vq, &vq_cfg, &vq_dyncfg);\n \tif (rc != 0) {\n-\t\t/* destroy virtqueue */\n \t\tsfc_vdpa_err(ops_data->dev_handle,\n \t\t\t \"virtqueue start failed: %s\",\n \t\t\t rte_strerror(rc));\n-\t\tefx_virtio_qdestroy(vq);\n \t\tgoto fail_virtio_qstart;\n \t}\n \n \tsfc_vdpa_info(ops_data->dev_handle,\n \t\t \"virtqueue started successfully for vq_num %d\", vq_num);\n \n+\trc = efx_virtio_get_doorbell_offset(vq,\t&doorbell);\n+\tif (rc != 0) {\n+\t\tsfc_vdpa_err(ops_data->dev_handle,\n+\t\t\t \"failed to get doorbell offset: %s\",\n+\t\t\t rte_strerror(rc));\n+\t\tgoto fail_doorbell;\n+\t}\n+\n+\t/*\n+\t * Cache the bar_offset here for each VQ here, it will come\n+\t * in handy when sfc_vdpa_get_notify_area() is invoked.\n+\t */\n+\tops_data->vq_cxt[vq_num].doorbell = (void *)(uintptr_t)doorbell;\n \tops_data->vq_cxt[vq_num].enable = B_TRUE;\n \n \treturn rc;\n \n+fail_doorbell:\n fail_virtio_qstart:\n+\tefx_virtio_qdestroy(vq);\n fail_vring_info:\n \treturn rc;\n }\n@@ -792,8 +806,6 @@\n \tint ret;\n \tefx_nic_t *nic;\n \tint vfio_dev_fd;\n-\tefx_rc_t rc;\n-\tunsigned int bar_offset;\n \tvolatile void *doorbell;\n \tstruct rte_pci_device *pci_dev;\n \tstruct rte_vdpa_device *vdpa_dev;\n@@ -824,19 +836,6 @@\n \t\treturn -1;\n \t}\n \n-\tif (ops_data->vq_cxt[qid].enable != B_TRUE) {\n-\t\tsfc_vdpa_err(dev, \"vq is not enabled\");\n-\t\treturn -1;\n-\t}\n-\n-\trc = efx_virtio_get_doorbell_offset(ops_data->vq_cxt[qid].vq,\n-\t\t\t\t\t &bar_offset);\n-\tif (rc != 0) {\n-\t\tsfc_vdpa_err(dev, \"failed to get doorbell offset: %s\",\n-\t\t\t rte_strerror(rc));\n-\t\treturn rc;\n-\t}\n-\n \treg.index = sfc_vdpa_adapter_by_dev_handle(dev)->mem_bar.esb_rid;\n \tret = ioctl(vfio_dev_fd, VFIO_DEVICE_GET_REGION_INFO, ®);\n \tif (ret != 0) {\n@@ -845,7 +844,8 @@\n \t\treturn ret;\n \t}\n \n-\t*offset = reg.offset + bar_offset;\n+\t/* Use bar_offset that was cached during sfc_vdpa_virtq_start() */\n+\t*offset = reg.offset + (uint64_t)ops_data->vq_cxt[qid].doorbell;\n \n \tlen = (1U << encp->enc_vi_window_shift) / 2;\n \tif (len >= sysconf(_SC_PAGESIZE)) {\ndiff --git a/drivers/vdpa/sfc/sfc_vdpa_ops.h b/drivers/vdpa/sfc/sfc_vdpa_ops.h\nindex 6d790fd..9dbd5b8 100644\n--- a/drivers/vdpa/sfc/sfc_vdpa_ops.h\n+++ b/drivers/vdpa/sfc/sfc_vdpa_ops.h\n@@ -35,6 +35,7 @@ struct sfc_vdpa_vring_info {\n };\n \n typedef struct sfc_vdpa_vq_context_s {\n+\tvolatile void\t\t\t*doorbell;\n \tuint8_t\t\t\t\tenable;\n \tuint32_t\t\t\tpidx;\n \tuint32_t\t\t\tcidx;\n", "prefixes": [] }