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2526 lines
66 KiB
2526 lines
66 KiB
/******************************************************************************* |
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* Vhost kernel TCM fabric driver for virtio SCSI initiators |
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* |
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* (C) Copyright 2010-2013 Datera, Inc. |
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* (C) Copyright 2010-2012 IBM Corp. |
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* |
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* Licensed to the Linux Foundation under the General Public License (GPL) version 2. |
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* |
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* Authors: Nicholas A. Bellinger <[email protected]> |
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* Stefan Hajnoczi <[email protected]> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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****************************************************************************/ |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <generated/utsrelease.h> |
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#include <linux/utsname.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/kthread.h> |
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#include <linux/types.h> |
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#include <linux/string.h> |
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#include <linux/configfs.h> |
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#include <linux/ctype.h> |
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#include <linux/compat.h> |
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#include <linux/eventfd.h> |
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#include <linux/fs.h> |
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#include <linux/vmalloc.h> |
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#include <linux/miscdevice.h> |
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#include <asm/unaligned.h> |
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#include <scsi/scsi_common.h> |
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#include <scsi/scsi_proto.h> |
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#include <target/target_core_base.h> |
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#include <target/target_core_fabric.h> |
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#include <linux/vhost.h> |
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#include <linux/virtio_scsi.h> |
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#include <linux/llist.h> |
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#include <linux/bitmap.h> |
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|
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#include "vhost.h" |
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|
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#define VHOST_SCSI_VERSION "v0.1" |
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#define VHOST_SCSI_NAMELEN 256 |
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#define VHOST_SCSI_MAX_CDB_SIZE 32 |
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#define VHOST_SCSI_PREALLOC_SGLS 2048 |
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#define VHOST_SCSI_PREALLOC_UPAGES 2048 |
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#define VHOST_SCSI_PREALLOC_PROT_SGLS 2048 |
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|
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/* Max number of requests before requeueing the job. |
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* Using this limit prevents one virtqueue from starving others with |
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* request. |
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*/ |
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#define VHOST_SCSI_WEIGHT 256 |
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|
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struct vhost_scsi_inflight { |
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/* Wait for the flush operation to finish */ |
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struct completion comp; |
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/* Refcount for the inflight reqs */ |
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struct kref kref; |
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}; |
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|
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struct vhost_scsi_cmd { |
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/* Descriptor from vhost_get_vq_desc() for virt_queue segment */ |
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int tvc_vq_desc; |
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/* virtio-scsi initiator task attribute */ |
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int tvc_task_attr; |
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/* virtio-scsi response incoming iovecs */ |
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int tvc_in_iovs; |
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/* virtio-scsi initiator data direction */ |
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enum dma_data_direction tvc_data_direction; |
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/* Expected data transfer length from virtio-scsi header */ |
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u32 tvc_exp_data_len; |
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/* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */ |
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u64 tvc_tag; |
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/* The number of scatterlists associated with this cmd */ |
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u32 tvc_sgl_count; |
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u32 tvc_prot_sgl_count; |
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/* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */ |
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u32 tvc_lun; |
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/* Pointer to the SGL formatted memory from virtio-scsi */ |
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struct scatterlist *tvc_sgl; |
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struct scatterlist *tvc_prot_sgl; |
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struct page **tvc_upages; |
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/* Pointer to response header iovec */ |
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struct iovec tvc_resp_iov; |
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/* Pointer to vhost_scsi for our device */ |
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struct vhost_scsi *tvc_vhost; |
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/* Pointer to vhost_virtqueue for the cmd */ |
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struct vhost_virtqueue *tvc_vq; |
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/* Pointer to vhost nexus memory */ |
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struct vhost_scsi_nexus *tvc_nexus; |
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/* The TCM I/O descriptor that is accessed via container_of() */ |
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struct se_cmd tvc_se_cmd; |
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/* work item used for cmwq dispatch to vhost_scsi_submission_work() */ |
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struct work_struct work; |
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/* Copy of the incoming SCSI command descriptor block (CDB) */ |
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unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE]; |
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/* Sense buffer that will be mapped into outgoing status */ |
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unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER]; |
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/* Completed commands list, serviced from vhost worker thread */ |
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struct llist_node tvc_completion_list; |
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/* Used to track inflight cmd */ |
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struct vhost_scsi_inflight *inflight; |
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}; |
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|
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struct vhost_scsi_nexus { |
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/* Pointer to TCM session for I_T Nexus */ |
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struct se_session *tvn_se_sess; |
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}; |
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|
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struct vhost_scsi_tpg { |
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/* Vhost port target portal group tag for TCM */ |
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u16 tport_tpgt; |
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/* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */ |
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int tv_tpg_port_count; |
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/* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */ |
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int tv_tpg_vhost_count; |
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/* Used for enabling T10-PI with legacy devices */ |
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int tv_fabric_prot_type; |
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/* list for vhost_scsi_list */ |
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struct list_head tv_tpg_list; |
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/* Used to protect access for tpg_nexus */ |
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struct mutex tv_tpg_mutex; |
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/* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */ |
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struct vhost_scsi_nexus *tpg_nexus; |
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/* Pointer back to vhost_scsi_tport */ |
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struct vhost_scsi_tport *tport; |
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/* Returned by vhost_scsi_make_tpg() */ |
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struct se_portal_group se_tpg; |
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/* Pointer back to vhost_scsi, protected by tv_tpg_mutex */ |
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struct vhost_scsi *vhost_scsi; |
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struct list_head tmf_queue; |
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}; |
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struct vhost_scsi_tport { |
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/* SCSI protocol the tport is providing */ |
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u8 tport_proto_id; |
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/* Binary World Wide unique Port Name for Vhost Target port */ |
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u64 tport_wwpn; |
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/* ASCII formatted WWPN for Vhost Target port */ |
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char tport_name[VHOST_SCSI_NAMELEN]; |
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/* Returned by vhost_scsi_make_tport() */ |
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struct se_wwn tport_wwn; |
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}; |
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struct vhost_scsi_evt { |
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/* event to be sent to guest */ |
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struct virtio_scsi_event event; |
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/* event list, serviced from vhost worker thread */ |
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struct llist_node list; |
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}; |
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enum { |
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VHOST_SCSI_VQ_CTL = 0, |
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VHOST_SCSI_VQ_EVT = 1, |
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VHOST_SCSI_VQ_IO = 2, |
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}; |
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|
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/* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */ |
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enum { |
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VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) | |
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(1ULL << VIRTIO_SCSI_F_T10_PI) |
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}; |
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#define VHOST_SCSI_MAX_TARGET 256 |
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#define VHOST_SCSI_MAX_VQ 128 |
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#define VHOST_SCSI_MAX_EVENT 128 |
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|
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struct vhost_scsi_virtqueue { |
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struct vhost_virtqueue vq; |
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/* |
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* Reference counting for inflight reqs, used for flush operation. At |
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* each time, one reference tracks new commands submitted, while we |
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* wait for another one to reach 0. |
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*/ |
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struct vhost_scsi_inflight inflights[2]; |
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/* |
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* Indicate current inflight in use, protected by vq->mutex. |
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* Writers must also take dev mutex and flush under it. |
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*/ |
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int inflight_idx; |
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struct vhost_scsi_cmd *scsi_cmds; |
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struct sbitmap scsi_tags; |
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int max_cmds; |
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}; |
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struct vhost_scsi { |
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/* Protected by vhost_scsi->dev.mutex */ |
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struct vhost_scsi_tpg **vs_tpg; |
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char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; |
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|
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struct vhost_dev dev; |
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struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ]; |
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struct vhost_work vs_completion_work; /* cmd completion work item */ |
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struct llist_head vs_completion_list; /* cmd completion queue */ |
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|
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struct vhost_work vs_event_work; /* evt injection work item */ |
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struct llist_head vs_event_list; /* evt injection queue */ |
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bool vs_events_missed; /* any missed events, protected by vq->mutex */ |
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int vs_events_nr; /* num of pending events, protected by vq->mutex */ |
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}; |
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struct vhost_scsi_tmf { |
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struct vhost_work vwork; |
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struct vhost_scsi_tpg *tpg; |
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struct vhost_scsi *vhost; |
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struct vhost_scsi_virtqueue *svq; |
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struct list_head queue_entry; |
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|
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struct se_cmd se_cmd; |
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u8 scsi_resp; |
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struct vhost_scsi_inflight *inflight; |
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struct iovec resp_iov; |
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int in_iovs; |
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int vq_desc; |
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}; |
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|
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/* |
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* Context for processing request and control queue operations. |
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*/ |
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struct vhost_scsi_ctx { |
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int head; |
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unsigned int out, in; |
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size_t req_size, rsp_size; |
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size_t out_size, in_size; |
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u8 *target, *lunp; |
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void *req; |
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struct iov_iter out_iter; |
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}; |
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static struct workqueue_struct *vhost_scsi_workqueue; |
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|
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/* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */ |
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static DEFINE_MUTEX(vhost_scsi_mutex); |
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static LIST_HEAD(vhost_scsi_list); |
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static void vhost_scsi_done_inflight(struct kref *kref) |
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{ |
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struct vhost_scsi_inflight *inflight; |
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|
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inflight = container_of(kref, struct vhost_scsi_inflight, kref); |
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complete(&inflight->comp); |
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} |
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static void vhost_scsi_init_inflight(struct vhost_scsi *vs, |
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struct vhost_scsi_inflight *old_inflight[]) |
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{ |
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struct vhost_scsi_inflight *new_inflight; |
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struct vhost_virtqueue *vq; |
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int idx, i; |
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for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
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vq = &vs->vqs[i].vq; |
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mutex_lock(&vq->mutex); |
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/* store old infight */ |
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idx = vs->vqs[i].inflight_idx; |
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if (old_inflight) |
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old_inflight[i] = &vs->vqs[i].inflights[idx]; |
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|
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/* setup new infight */ |
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vs->vqs[i].inflight_idx = idx ^ 1; |
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new_inflight = &vs->vqs[i].inflights[idx ^ 1]; |
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kref_init(&new_inflight->kref); |
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init_completion(&new_inflight->comp); |
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|
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mutex_unlock(&vq->mutex); |
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} |
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} |
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static struct vhost_scsi_inflight * |
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vhost_scsi_get_inflight(struct vhost_virtqueue *vq) |
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{ |
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struct vhost_scsi_inflight *inflight; |
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struct vhost_scsi_virtqueue *svq; |
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svq = container_of(vq, struct vhost_scsi_virtqueue, vq); |
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inflight = &svq->inflights[svq->inflight_idx]; |
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kref_get(&inflight->kref); |
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return inflight; |
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} |
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static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight) |
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{ |
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kref_put(&inflight->kref, vhost_scsi_done_inflight); |
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} |
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static int vhost_scsi_check_true(struct se_portal_group *se_tpg) |
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{ |
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return 1; |
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} |
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static int vhost_scsi_check_false(struct se_portal_group *se_tpg) |
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{ |
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return 0; |
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} |
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static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg) |
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{ |
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struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
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struct vhost_scsi_tpg, se_tpg); |
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struct vhost_scsi_tport *tport = tpg->tport; |
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|
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return &tport->tport_name[0]; |
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} |
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static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg) |
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{ |
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struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
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struct vhost_scsi_tpg, se_tpg); |
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return tpg->tport_tpgt; |
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} |
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|
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static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg) |
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{ |
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struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
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struct vhost_scsi_tpg, se_tpg); |
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|
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return tpg->tv_fabric_prot_type; |
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} |
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|
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static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg) |
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{ |
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return 1; |
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} |
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|
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static void vhost_scsi_release_cmd_res(struct se_cmd *se_cmd) |
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{ |
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struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd, |
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struct vhost_scsi_cmd, tvc_se_cmd); |
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struct vhost_scsi_virtqueue *svq = container_of(tv_cmd->tvc_vq, |
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struct vhost_scsi_virtqueue, vq); |
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struct vhost_scsi_inflight *inflight = tv_cmd->inflight; |
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int i; |
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|
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if (tv_cmd->tvc_sgl_count) { |
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for (i = 0; i < tv_cmd->tvc_sgl_count; i++) |
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put_page(sg_page(&tv_cmd->tvc_sgl[i])); |
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} |
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if (tv_cmd->tvc_prot_sgl_count) { |
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for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++) |
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put_page(sg_page(&tv_cmd->tvc_prot_sgl[i])); |
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} |
|
|
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sbitmap_clear_bit(&svq->scsi_tags, se_cmd->map_tag); |
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vhost_scsi_put_inflight(inflight); |
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} |
|
|
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static void vhost_scsi_release_tmf_res(struct vhost_scsi_tmf *tmf) |
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{ |
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struct vhost_scsi_tpg *tpg = tmf->tpg; |
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struct vhost_scsi_inflight *inflight = tmf->inflight; |
|
|
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mutex_lock(&tpg->tv_tpg_mutex); |
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list_add_tail(&tpg->tmf_queue, &tmf->queue_entry); |
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mutex_unlock(&tpg->tv_tpg_mutex); |
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vhost_scsi_put_inflight(inflight); |
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} |
|
|
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static void vhost_scsi_release_cmd(struct se_cmd *se_cmd) |
|
{ |
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if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) { |
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struct vhost_scsi_tmf *tmf = container_of(se_cmd, |
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struct vhost_scsi_tmf, se_cmd); |
|
|
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vhost_work_queue(&tmf->vhost->dev, &tmf->vwork); |
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} else { |
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struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
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struct vhost_scsi_cmd, tvc_se_cmd); |
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struct vhost_scsi *vs = cmd->tvc_vhost; |
|
|
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llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); |
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vhost_work_queue(&vs->dev, &vs->vs_completion_work); |
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} |
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} |
|
|
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static u32 vhost_scsi_sess_get_index(struct se_session *se_sess) |
|
{ |
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return 0; |
|
} |
|
|
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static int vhost_scsi_write_pending(struct se_cmd *se_cmd) |
|
{ |
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/* Go ahead and process the write immediately */ |
|
target_execute_cmd(se_cmd); |
|
return 0; |
|
} |
|
|
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static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl) |
|
{ |
|
return; |
|
} |
|
|
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static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd) |
|
{ |
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return 0; |
|
} |
|
|
|
static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd) |
|
{ |
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transport_generic_free_cmd(se_cmd, 0); |
|
return 0; |
|
} |
|
|
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static int vhost_scsi_queue_status(struct se_cmd *se_cmd) |
|
{ |
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transport_generic_free_cmd(se_cmd, 0); |
|
return 0; |
|
} |
|
|
|
static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd) |
|
{ |
|
struct vhost_scsi_tmf *tmf = container_of(se_cmd, struct vhost_scsi_tmf, |
|
se_cmd); |
|
|
|
tmf->scsi_resp = se_cmd->se_tmr_req->response; |
|
transport_generic_free_cmd(&tmf->se_cmd, 0); |
|
} |
|
|
|
static void vhost_scsi_aborted_task(struct se_cmd *se_cmd) |
|
{ |
|
return; |
|
} |
|
|
|
static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
|
{ |
|
vs->vs_events_nr--; |
|
kfree(evt); |
|
} |
|
|
|
static struct vhost_scsi_evt * |
|
vhost_scsi_allocate_evt(struct vhost_scsi *vs, |
|
u32 event, u32 reason) |
|
{ |
|
struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
|
struct vhost_scsi_evt *evt; |
|
|
|
if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { |
|
vs->vs_events_missed = true; |
|
return NULL; |
|
} |
|
|
|
evt = kzalloc(sizeof(*evt), GFP_KERNEL); |
|
if (!evt) { |
|
vq_err(vq, "Failed to allocate vhost_scsi_evt\n"); |
|
vs->vs_events_missed = true; |
|
return NULL; |
|
} |
|
|
|
evt->event.event = cpu_to_vhost32(vq, event); |
|
evt->event.reason = cpu_to_vhost32(vq, reason); |
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vs->vs_events_nr++; |
|
|
|
return evt; |
|
} |
|
|
|
static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) |
|
{ |
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return target_put_sess_cmd(se_cmd); |
|
} |
|
|
|
static void |
|
vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
|
{ |
|
struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
|
struct virtio_scsi_event *event = &evt->event; |
|
struct virtio_scsi_event __user *eventp; |
|
unsigned out, in; |
|
int head, ret; |
|
|
|
if (!vhost_vq_get_backend(vq)) { |
|
vs->vs_events_missed = true; |
|
return; |
|
} |
|
|
|
again: |
|
vhost_disable_notify(&vs->dev, vq); |
|
head = vhost_get_vq_desc(vq, vq->iov, |
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ARRAY_SIZE(vq->iov), &out, &in, |
|
NULL, NULL); |
|
if (head < 0) { |
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vs->vs_events_missed = true; |
|
return; |
|
} |
|
if (head == vq->num) { |
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if (vhost_enable_notify(&vs->dev, vq)) |
|
goto again; |
|
vs->vs_events_missed = true; |
|
return; |
|
} |
|
|
|
if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { |
|
vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", |
|
vq->iov[out].iov_len); |
|
vs->vs_events_missed = true; |
|
return; |
|
} |
|
|
|
if (vs->vs_events_missed) { |
|
event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED); |
|
vs->vs_events_missed = false; |
|
} |
|
|
|
eventp = vq->iov[out].iov_base; |
|
ret = __copy_to_user(eventp, event, sizeof(*event)); |
|
if (!ret) |
|
vhost_add_used_and_signal(&vs->dev, vq, head, 0); |
|
else |
|
vq_err(vq, "Faulted on vhost_scsi_send_event\n"); |
|
} |
|
|
|
static void vhost_scsi_evt_work(struct vhost_work *work) |
|
{ |
|
struct vhost_scsi *vs = container_of(work, struct vhost_scsi, |
|
vs_event_work); |
|
struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
|
struct vhost_scsi_evt *evt, *t; |
|
struct llist_node *llnode; |
|
|
|
mutex_lock(&vq->mutex); |
|
llnode = llist_del_all(&vs->vs_event_list); |
|
llist_for_each_entry_safe(evt, t, llnode, list) { |
|
vhost_scsi_do_evt_work(vs, evt); |
|
vhost_scsi_free_evt(vs, evt); |
|
} |
|
mutex_unlock(&vq->mutex); |
|
} |
|
|
|
/* Fill in status and signal that we are done processing this command |
|
* |
|
* This is scheduled in the vhost work queue so we are called with the owner |
|
* process mm and can access the vring. |
|
*/ |
|
static void vhost_scsi_complete_cmd_work(struct vhost_work *work) |
|
{ |
|
struct vhost_scsi *vs = container_of(work, struct vhost_scsi, |
|
vs_completion_work); |
|
DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); |
|
struct virtio_scsi_cmd_resp v_rsp; |
|
struct vhost_scsi_cmd *cmd, *t; |
|
struct llist_node *llnode; |
|
struct se_cmd *se_cmd; |
|
struct iov_iter iov_iter; |
|
int ret, vq; |
|
|
|
bitmap_zero(signal, VHOST_SCSI_MAX_VQ); |
|
llnode = llist_del_all(&vs->vs_completion_list); |
|
llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list) { |
|
se_cmd = &cmd->tvc_se_cmd; |
|
|
|
pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, |
|
cmd, se_cmd->residual_count, se_cmd->scsi_status); |
|
|
|
memset(&v_rsp, 0, sizeof(v_rsp)); |
|
v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count); |
|
/* TODO is status_qualifier field needed? */ |
|
v_rsp.status = se_cmd->scsi_status; |
|
v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq, |
|
se_cmd->scsi_sense_length); |
|
memcpy(v_rsp.sense, cmd->tvc_sense_buf, |
|
se_cmd->scsi_sense_length); |
|
|
|
iov_iter_init(&iov_iter, READ, &cmd->tvc_resp_iov, |
|
cmd->tvc_in_iovs, sizeof(v_rsp)); |
|
ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter); |
|
if (likely(ret == sizeof(v_rsp))) { |
|
struct vhost_scsi_virtqueue *q; |
|
vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); |
|
q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); |
|
vq = q - vs->vqs; |
|
__set_bit(vq, signal); |
|
} else |
|
pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
|
|
|
vhost_scsi_release_cmd_res(se_cmd); |
|
} |
|
|
|
vq = -1; |
|
while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) |
|
< VHOST_SCSI_MAX_VQ) |
|
vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
|
} |
|
|
|
static struct vhost_scsi_cmd * |
|
vhost_scsi_get_cmd(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg, |
|
unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr, |
|
u32 exp_data_len, int data_direction) |
|
{ |
|
struct vhost_scsi_virtqueue *svq = container_of(vq, |
|
struct vhost_scsi_virtqueue, vq); |
|
struct vhost_scsi_cmd *cmd; |
|
struct vhost_scsi_nexus *tv_nexus; |
|
struct scatterlist *sg, *prot_sg; |
|
struct page **pages; |
|
int tag; |
|
|
|
tv_nexus = tpg->tpg_nexus; |
|
if (!tv_nexus) { |
|
pr_err("Unable to locate active struct vhost_scsi_nexus\n"); |
|
return ERR_PTR(-EIO); |
|
} |
|
|
|
tag = sbitmap_get(&svq->scsi_tags, 0, false); |
|
if (tag < 0) { |
|
pr_err("Unable to obtain tag for vhost_scsi_cmd\n"); |
|
return ERR_PTR(-ENOMEM); |
|
} |
|
|
|
cmd = &svq->scsi_cmds[tag]; |
|
sg = cmd->tvc_sgl; |
|
prot_sg = cmd->tvc_prot_sgl; |
|
pages = cmd->tvc_upages; |
|
memset(cmd, 0, sizeof(*cmd)); |
|
cmd->tvc_sgl = sg; |
|
cmd->tvc_prot_sgl = prot_sg; |
|
cmd->tvc_upages = pages; |
|
cmd->tvc_se_cmd.map_tag = tag; |
|
cmd->tvc_tag = scsi_tag; |
|
cmd->tvc_lun = lun; |
|
cmd->tvc_task_attr = task_attr; |
|
cmd->tvc_exp_data_len = exp_data_len; |
|
cmd->tvc_data_direction = data_direction; |
|
cmd->tvc_nexus = tv_nexus; |
|
cmd->inflight = vhost_scsi_get_inflight(vq); |
|
|
|
memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE); |
|
|
|
return cmd; |
|
} |
|
|
|
/* |
|
* Map a user memory range into a scatterlist |
|
* |
|
* Returns the number of scatterlist entries used or -errno on error. |
|
*/ |
|
static int |
|
vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd, |
|
struct iov_iter *iter, |
|
struct scatterlist *sgl, |
|
bool write) |
|
{ |
|
struct page **pages = cmd->tvc_upages; |
|
struct scatterlist *sg = sgl; |
|
ssize_t bytes; |
|
size_t offset; |
|
unsigned int npages = 0; |
|
|
|
bytes = iov_iter_get_pages(iter, pages, LONG_MAX, |
|
VHOST_SCSI_PREALLOC_UPAGES, &offset); |
|
/* No pages were pinned */ |
|
if (bytes <= 0) |
|
return bytes < 0 ? bytes : -EFAULT; |
|
|
|
iov_iter_advance(iter, bytes); |
|
|
|
while (bytes) { |
|
unsigned n = min_t(unsigned, PAGE_SIZE - offset, bytes); |
|
sg_set_page(sg++, pages[npages++], n, offset); |
|
bytes -= n; |
|
offset = 0; |
|
} |
|
return npages; |
|
} |
|
|
|
static int |
|
vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls) |
|
{ |
|
int sgl_count = 0; |
|
|
|
if (!iter || !iter->iov) { |
|
pr_err("%s: iter->iov is NULL, but expected bytes: %zu" |
|
" present\n", __func__, bytes); |
|
return -EINVAL; |
|
} |
|
|
|
sgl_count = iov_iter_npages(iter, 0xffff); |
|
if (sgl_count > max_sgls) { |
|
pr_err("%s: requested sgl_count: %d exceeds pre-allocated" |
|
" max_sgls: %d\n", __func__, sgl_count, max_sgls); |
|
return -EINVAL; |
|
} |
|
return sgl_count; |
|
} |
|
|
|
static int |
|
vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write, |
|
struct iov_iter *iter, |
|
struct scatterlist *sg, int sg_count) |
|
{ |
|
struct scatterlist *p = sg; |
|
int ret; |
|
|
|
while (iov_iter_count(iter)) { |
|
ret = vhost_scsi_map_to_sgl(cmd, iter, sg, write); |
|
if (ret < 0) { |
|
while (p < sg) { |
|
struct page *page = sg_page(p++); |
|
if (page) |
|
put_page(page); |
|
} |
|
return ret; |
|
} |
|
sg += ret; |
|
} |
|
return 0; |
|
} |
|
|
|
static int |
|
vhost_scsi_mapal(struct vhost_scsi_cmd *cmd, |
|
size_t prot_bytes, struct iov_iter *prot_iter, |
|
size_t data_bytes, struct iov_iter *data_iter) |
|
{ |
|
int sgl_count, ret; |
|
bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE); |
|
|
|
if (prot_bytes) { |
|
sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes, |
|
VHOST_SCSI_PREALLOC_PROT_SGLS); |
|
if (sgl_count < 0) |
|
return sgl_count; |
|
|
|
sg_init_table(cmd->tvc_prot_sgl, sgl_count); |
|
cmd->tvc_prot_sgl_count = sgl_count; |
|
pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__, |
|
cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count); |
|
|
|
ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter, |
|
cmd->tvc_prot_sgl, |
|
cmd->tvc_prot_sgl_count); |
|
if (ret < 0) { |
|
cmd->tvc_prot_sgl_count = 0; |
|
return ret; |
|
} |
|
} |
|
sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes, |
|
VHOST_SCSI_PREALLOC_SGLS); |
|
if (sgl_count < 0) |
|
return sgl_count; |
|
|
|
sg_init_table(cmd->tvc_sgl, sgl_count); |
|
cmd->tvc_sgl_count = sgl_count; |
|
pr_debug("%s data_sg %p data_sgl_count %u\n", __func__, |
|
cmd->tvc_sgl, cmd->tvc_sgl_count); |
|
|
|
ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter, |
|
cmd->tvc_sgl, cmd->tvc_sgl_count); |
|
if (ret < 0) { |
|
cmd->tvc_sgl_count = 0; |
|
return ret; |
|
} |
|
return 0; |
|
} |
|
|
|
static int vhost_scsi_to_tcm_attr(int attr) |
|
{ |
|
switch (attr) { |
|
case VIRTIO_SCSI_S_SIMPLE: |
|
return TCM_SIMPLE_TAG; |
|
case VIRTIO_SCSI_S_ORDERED: |
|
return TCM_ORDERED_TAG; |
|
case VIRTIO_SCSI_S_HEAD: |
|
return TCM_HEAD_TAG; |
|
case VIRTIO_SCSI_S_ACA: |
|
return TCM_ACA_TAG; |
|
default: |
|
break; |
|
} |
|
return TCM_SIMPLE_TAG; |
|
} |
|
|
|
static void vhost_scsi_submission_work(struct work_struct *work) |
|
{ |
|
struct vhost_scsi_cmd *cmd = |
|
container_of(work, struct vhost_scsi_cmd, work); |
|
struct vhost_scsi_nexus *tv_nexus; |
|
struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
|
struct scatterlist *sg_ptr, *sg_prot_ptr = NULL; |
|
int rc; |
|
|
|
/* FIXME: BIDI operation */ |
|
if (cmd->tvc_sgl_count) { |
|
sg_ptr = cmd->tvc_sgl; |
|
|
|
if (cmd->tvc_prot_sgl_count) |
|
sg_prot_ptr = cmd->tvc_prot_sgl; |
|
else |
|
se_cmd->prot_pto = true; |
|
} else { |
|
sg_ptr = NULL; |
|
} |
|
tv_nexus = cmd->tvc_nexus; |
|
|
|
se_cmd->tag = 0; |
|
rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, |
|
cmd->tvc_cdb, &cmd->tvc_sense_buf[0], |
|
cmd->tvc_lun, cmd->tvc_exp_data_len, |
|
vhost_scsi_to_tcm_attr(cmd->tvc_task_attr), |
|
cmd->tvc_data_direction, TARGET_SCF_ACK_KREF, |
|
sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr, |
|
cmd->tvc_prot_sgl_count); |
|
if (rc < 0) { |
|
transport_send_check_condition_and_sense(se_cmd, |
|
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
|
transport_generic_free_cmd(se_cmd, 0); |
|
} |
|
} |
|
|
|
static void |
|
vhost_scsi_send_bad_target(struct vhost_scsi *vs, |
|
struct vhost_virtqueue *vq, |
|
int head, unsigned out) |
|
{ |
|
struct virtio_scsi_cmd_resp __user *resp; |
|
struct virtio_scsi_cmd_resp rsp; |
|
int ret; |
|
|
|
memset(&rsp, 0, sizeof(rsp)); |
|
rsp.response = VIRTIO_SCSI_S_BAD_TARGET; |
|
resp = vq->iov[out].iov_base; |
|
ret = __copy_to_user(resp, &rsp, sizeof(rsp)); |
|
if (!ret) |
|
vhost_add_used_and_signal(&vs->dev, vq, head, 0); |
|
else |
|
pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
|
} |
|
|
|
static int |
|
vhost_scsi_get_desc(struct vhost_scsi *vs, struct vhost_virtqueue *vq, |
|
struct vhost_scsi_ctx *vc) |
|
{ |
|
int ret = -ENXIO; |
|
|
|
vc->head = vhost_get_vq_desc(vq, vq->iov, |
|
ARRAY_SIZE(vq->iov), &vc->out, &vc->in, |
|
NULL, NULL); |
|
|
|
pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", |
|
vc->head, vc->out, vc->in); |
|
|
|
/* On error, stop handling until the next kick. */ |
|
if (unlikely(vc->head < 0)) |
|
goto done; |
|
|
|
/* Nothing new? Wait for eventfd to tell us they refilled. */ |
|
if (vc->head == vq->num) { |
|
if (unlikely(vhost_enable_notify(&vs->dev, vq))) { |
|
vhost_disable_notify(&vs->dev, vq); |
|
ret = -EAGAIN; |
|
} |
|
goto done; |
|
} |
|
|
|
/* |
|
* Get the size of request and response buffers. |
|
* FIXME: Not correct for BIDI operation |
|
*/ |
|
vc->out_size = iov_length(vq->iov, vc->out); |
|
vc->in_size = iov_length(&vq->iov[vc->out], vc->in); |
|
|
|
/* |
|
* Copy over the virtio-scsi request header, which for a |
|
* ANY_LAYOUT enabled guest may span multiple iovecs, or a |
|
* single iovec may contain both the header + outgoing |
|
* WRITE payloads. |
|
* |
|
* copy_from_iter() will advance out_iter, so that it will |
|
* point at the start of the outgoing WRITE payload, if |
|
* DMA_TO_DEVICE is set. |
|
*/ |
|
iov_iter_init(&vc->out_iter, WRITE, vq->iov, vc->out, vc->out_size); |
|
ret = 0; |
|
|
|
done: |
|
return ret; |
|
} |
|
|
|
static int |
|
vhost_scsi_chk_size(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc) |
|
{ |
|
if (unlikely(vc->in_size < vc->rsp_size)) { |
|
vq_err(vq, |
|
"Response buf too small, need min %zu bytes got %zu", |
|
vc->rsp_size, vc->in_size); |
|
return -EINVAL; |
|
} else if (unlikely(vc->out_size < vc->req_size)) { |
|
vq_err(vq, |
|
"Request buf too small, need min %zu bytes got %zu", |
|
vc->req_size, vc->out_size); |
|
return -EIO; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int |
|
vhost_scsi_get_req(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc, |
|
struct vhost_scsi_tpg **tpgp) |
|
{ |
|
int ret = -EIO; |
|
|
|
if (unlikely(!copy_from_iter_full(vc->req, vc->req_size, |
|
&vc->out_iter))) { |
|
vq_err(vq, "Faulted on copy_from_iter_full\n"); |
|
} else if (unlikely(*vc->lunp != 1)) { |
|
/* virtio-scsi spec requires byte 0 of the lun to be 1 */ |
|
vq_err(vq, "Illegal virtio-scsi lun: %u\n", *vc->lunp); |
|
} else { |
|
struct vhost_scsi_tpg **vs_tpg, *tpg; |
|
|
|
vs_tpg = vhost_vq_get_backend(vq); /* validated at handler entry */ |
|
|
|
tpg = READ_ONCE(vs_tpg[*vc->target]); |
|
if (unlikely(!tpg)) { |
|
vq_err(vq, "Target 0x%x does not exist\n", *vc->target); |
|
} else { |
|
if (tpgp) |
|
*tpgp = tpg; |
|
ret = 0; |
|
} |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static u16 vhost_buf_to_lun(u8 *lun_buf) |
|
{ |
|
return ((lun_buf[2] << 8) | lun_buf[3]) & 0x3FFF; |
|
} |
|
|
|
static void |
|
vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) |
|
{ |
|
struct vhost_scsi_tpg **vs_tpg, *tpg; |
|
struct virtio_scsi_cmd_req v_req; |
|
struct virtio_scsi_cmd_req_pi v_req_pi; |
|
struct vhost_scsi_ctx vc; |
|
struct vhost_scsi_cmd *cmd; |
|
struct iov_iter in_iter, prot_iter, data_iter; |
|
u64 tag; |
|
u32 exp_data_len, data_direction; |
|
int ret, prot_bytes, c = 0; |
|
u16 lun; |
|
u8 task_attr; |
|
bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI); |
|
void *cdb; |
|
|
|
mutex_lock(&vq->mutex); |
|
/* |
|
* We can handle the vq only after the endpoint is setup by calling the |
|
* VHOST_SCSI_SET_ENDPOINT ioctl. |
|
*/ |
|
vs_tpg = vhost_vq_get_backend(vq); |
|
if (!vs_tpg) |
|
goto out; |
|
|
|
memset(&vc, 0, sizeof(vc)); |
|
vc.rsp_size = sizeof(struct virtio_scsi_cmd_resp); |
|
|
|
vhost_disable_notify(&vs->dev, vq); |
|
|
|
do { |
|
ret = vhost_scsi_get_desc(vs, vq, &vc); |
|
if (ret) |
|
goto err; |
|
|
|
/* |
|
* Setup pointers and values based upon different virtio-scsi |
|
* request header if T10_PI is enabled in KVM guest. |
|
*/ |
|
if (t10_pi) { |
|
vc.req = &v_req_pi; |
|
vc.req_size = sizeof(v_req_pi); |
|
vc.lunp = &v_req_pi.lun[0]; |
|
vc.target = &v_req_pi.lun[1]; |
|
} else { |
|
vc.req = &v_req; |
|
vc.req_size = sizeof(v_req); |
|
vc.lunp = &v_req.lun[0]; |
|
vc.target = &v_req.lun[1]; |
|
} |
|
|
|
/* |
|
* Validate the size of request and response buffers. |
|
* Check for a sane response buffer so we can report |
|
* early errors back to the guest. |
|
*/ |
|
ret = vhost_scsi_chk_size(vq, &vc); |
|
if (ret) |
|
goto err; |
|
|
|
ret = vhost_scsi_get_req(vq, &vc, &tpg); |
|
if (ret) |
|
goto err; |
|
|
|
ret = -EIO; /* bad target on any error from here on */ |
|
|
|
/* |
|
* Determine data_direction by calculating the total outgoing |
|
* iovec sizes + incoming iovec sizes vs. virtio-scsi request + |
|
* response headers respectively. |
|
* |
|
* For DMA_TO_DEVICE this is out_iter, which is already pointing |
|
* to the right place. |
|
* |
|
* For DMA_FROM_DEVICE, the iovec will be just past the end |
|
* of the virtio-scsi response header in either the same |
|
* or immediately following iovec. |
|
* |
|
* Any associated T10_PI bytes for the outgoing / incoming |
|
* payloads are included in calculation of exp_data_len here. |
|
*/ |
|
prot_bytes = 0; |
|
|
|
if (vc.out_size > vc.req_size) { |
|
data_direction = DMA_TO_DEVICE; |
|
exp_data_len = vc.out_size - vc.req_size; |
|
data_iter = vc.out_iter; |
|
} else if (vc.in_size > vc.rsp_size) { |
|
data_direction = DMA_FROM_DEVICE; |
|
exp_data_len = vc.in_size - vc.rsp_size; |
|
|
|
iov_iter_init(&in_iter, READ, &vq->iov[vc.out], vc.in, |
|
vc.rsp_size + exp_data_len); |
|
iov_iter_advance(&in_iter, vc.rsp_size); |
|
data_iter = in_iter; |
|
} else { |
|
data_direction = DMA_NONE; |
|
exp_data_len = 0; |
|
} |
|
/* |
|
* If T10_PI header + payload is present, setup prot_iter values |
|
* and recalculate data_iter for vhost_scsi_mapal() mapping to |
|
* host scatterlists via get_user_pages_fast(). |
|
*/ |
|
if (t10_pi) { |
|
if (v_req_pi.pi_bytesout) { |
|
if (data_direction != DMA_TO_DEVICE) { |
|
vq_err(vq, "Received non zero pi_bytesout," |
|
" but wrong data_direction\n"); |
|
goto err; |
|
} |
|
prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout); |
|
} else if (v_req_pi.pi_bytesin) { |
|
if (data_direction != DMA_FROM_DEVICE) { |
|
vq_err(vq, "Received non zero pi_bytesin," |
|
" but wrong data_direction\n"); |
|
goto err; |
|
} |
|
prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin); |
|
} |
|
/* |
|
* Set prot_iter to data_iter and truncate it to |
|
* prot_bytes, and advance data_iter past any |
|
* preceeding prot_bytes that may be present. |
|
* |
|
* Also fix up the exp_data_len to reflect only the |
|
* actual data payload length. |
|
*/ |
|
if (prot_bytes) { |
|
exp_data_len -= prot_bytes; |
|
prot_iter = data_iter; |
|
iov_iter_truncate(&prot_iter, prot_bytes); |
|
iov_iter_advance(&data_iter, prot_bytes); |
|
} |
|
tag = vhost64_to_cpu(vq, v_req_pi.tag); |
|
task_attr = v_req_pi.task_attr; |
|
cdb = &v_req_pi.cdb[0]; |
|
lun = vhost_buf_to_lun(v_req_pi.lun); |
|
} else { |
|
tag = vhost64_to_cpu(vq, v_req.tag); |
|
task_attr = v_req.task_attr; |
|
cdb = &v_req.cdb[0]; |
|
lun = vhost_buf_to_lun(v_req.lun); |
|
} |
|
/* |
|
* Check that the received CDB size does not exceeded our |
|
* hardcoded max for vhost-scsi, then get a pre-allocated |
|
* cmd descriptor for the new virtio-scsi tag. |
|
* |
|
* TODO what if cdb was too small for varlen cdb header? |
|
*/ |
|
if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) { |
|
vq_err(vq, "Received SCSI CDB with command_size: %d that" |
|
" exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
|
scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE); |
|
goto err; |
|
} |
|
cmd = vhost_scsi_get_cmd(vq, tpg, cdb, tag, lun, task_attr, |
|
exp_data_len + prot_bytes, |
|
data_direction); |
|
if (IS_ERR(cmd)) { |
|
vq_err(vq, "vhost_scsi_get_cmd failed %ld\n", |
|
PTR_ERR(cmd)); |
|
goto err; |
|
} |
|
cmd->tvc_vhost = vs; |
|
cmd->tvc_vq = vq; |
|
cmd->tvc_resp_iov = vq->iov[vc.out]; |
|
cmd->tvc_in_iovs = vc.in; |
|
|
|
pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", |
|
cmd->tvc_cdb[0], cmd->tvc_lun); |
|
pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:" |
|
" %d\n", cmd, exp_data_len, prot_bytes, data_direction); |
|
|
|
if (data_direction != DMA_NONE) { |
|
if (unlikely(vhost_scsi_mapal(cmd, prot_bytes, |
|
&prot_iter, exp_data_len, |
|
&data_iter))) { |
|
vq_err(vq, "Failed to map iov to sgl\n"); |
|
vhost_scsi_release_cmd_res(&cmd->tvc_se_cmd); |
|
goto err; |
|
} |
|
} |
|
/* |
|
* Save the descriptor from vhost_get_vq_desc() to be used to |
|
* complete the virtio-scsi request in TCM callback context via |
|
* vhost_scsi_queue_data_in() and vhost_scsi_queue_status() |
|
*/ |
|
cmd->tvc_vq_desc = vc.head; |
|
/* |
|
* Dispatch cmd descriptor for cmwq execution in process |
|
* context provided by vhost_scsi_workqueue. This also ensures |
|
* cmd is executed on the same kworker CPU as this vhost |
|
* thread to gain positive L2 cache locality effects. |
|
*/ |
|
INIT_WORK(&cmd->work, vhost_scsi_submission_work); |
|
queue_work(vhost_scsi_workqueue, &cmd->work); |
|
ret = 0; |
|
err: |
|
/* |
|
* ENXIO: No more requests, or read error, wait for next kick |
|
* EINVAL: Invalid response buffer, drop the request |
|
* EIO: Respond with bad target |
|
* EAGAIN: Pending request |
|
*/ |
|
if (ret == -ENXIO) |
|
break; |
|
else if (ret == -EIO) |
|
vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out); |
|
} while (likely(!vhost_exceeds_weight(vq, ++c, 0))); |
|
out: |
|
mutex_unlock(&vq->mutex); |
|
} |
|
|
|
static void |
|
vhost_scsi_send_tmf_resp(struct vhost_scsi *vs, struct vhost_virtqueue *vq, |
|
int in_iovs, int vq_desc, struct iovec *resp_iov, |
|
int tmf_resp_code) |
|
{ |
|
struct virtio_scsi_ctrl_tmf_resp rsp; |
|
struct iov_iter iov_iter; |
|
int ret; |
|
|
|
pr_debug("%s\n", __func__); |
|
memset(&rsp, 0, sizeof(rsp)); |
|
rsp.response = tmf_resp_code; |
|
|
|
iov_iter_init(&iov_iter, READ, resp_iov, in_iovs, sizeof(rsp)); |
|
|
|
ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter); |
|
if (likely(ret == sizeof(rsp))) |
|
vhost_add_used_and_signal(&vs->dev, vq, vq_desc, 0); |
|
else |
|
pr_err("Faulted on virtio_scsi_ctrl_tmf_resp\n"); |
|
} |
|
|
|
static void vhost_scsi_tmf_resp_work(struct vhost_work *work) |
|
{ |
|
struct vhost_scsi_tmf *tmf = container_of(work, struct vhost_scsi_tmf, |
|
vwork); |
|
int resp_code; |
|
|
|
if (tmf->scsi_resp == TMR_FUNCTION_COMPLETE) |
|
resp_code = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; |
|
else |
|
resp_code = VIRTIO_SCSI_S_FUNCTION_REJECTED; |
|
|
|
vhost_scsi_send_tmf_resp(tmf->vhost, &tmf->svq->vq, tmf->in_iovs, |
|
tmf->vq_desc, &tmf->resp_iov, resp_code); |
|
vhost_scsi_release_tmf_res(tmf); |
|
} |
|
|
|
static void |
|
vhost_scsi_handle_tmf(struct vhost_scsi *vs, struct vhost_scsi_tpg *tpg, |
|
struct vhost_virtqueue *vq, |
|
struct virtio_scsi_ctrl_tmf_req *vtmf, |
|
struct vhost_scsi_ctx *vc) |
|
{ |
|
struct vhost_scsi_virtqueue *svq = container_of(vq, |
|
struct vhost_scsi_virtqueue, vq); |
|
struct vhost_scsi_tmf *tmf; |
|
|
|
if (vhost32_to_cpu(vq, vtmf->subtype) != |
|
VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET) |
|
goto send_reject; |
|
|
|
if (!tpg->tpg_nexus || !tpg->tpg_nexus->tvn_se_sess) { |
|
pr_err("Unable to locate active struct vhost_scsi_nexus for LUN RESET.\n"); |
|
goto send_reject; |
|
} |
|
|
|
mutex_lock(&tpg->tv_tpg_mutex); |
|
if (list_empty(&tpg->tmf_queue)) { |
|
pr_err("Missing reserve TMF. Could not handle LUN RESET.\n"); |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
goto send_reject; |
|
} |
|
|
|
tmf = list_first_entry(&tpg->tmf_queue, struct vhost_scsi_tmf, |
|
queue_entry); |
|
list_del_init(&tmf->queue_entry); |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
|
|
tmf->tpg = tpg; |
|
tmf->vhost = vs; |
|
tmf->svq = svq; |
|
tmf->resp_iov = vq->iov[vc->out]; |
|
tmf->vq_desc = vc->head; |
|
tmf->in_iovs = vc->in; |
|
tmf->inflight = vhost_scsi_get_inflight(vq); |
|
|
|
if (target_submit_tmr(&tmf->se_cmd, tpg->tpg_nexus->tvn_se_sess, NULL, |
|
vhost_buf_to_lun(vtmf->lun), NULL, |
|
TMR_LUN_RESET, GFP_KERNEL, 0, |
|
TARGET_SCF_ACK_KREF) < 0) { |
|
vhost_scsi_release_tmf_res(tmf); |
|
goto send_reject; |
|
} |
|
|
|
return; |
|
|
|
send_reject: |
|
vhost_scsi_send_tmf_resp(vs, vq, vc->in, vc->head, &vq->iov[vc->out], |
|
VIRTIO_SCSI_S_FUNCTION_REJECTED); |
|
} |
|
|
|
static void |
|
vhost_scsi_send_an_resp(struct vhost_scsi *vs, |
|
struct vhost_virtqueue *vq, |
|
struct vhost_scsi_ctx *vc) |
|
{ |
|
struct virtio_scsi_ctrl_an_resp rsp; |
|
struct iov_iter iov_iter; |
|
int ret; |
|
|
|
pr_debug("%s\n", __func__); |
|
memset(&rsp, 0, sizeof(rsp)); /* event_actual = 0 */ |
|
rsp.response = VIRTIO_SCSI_S_OK; |
|
|
|
iov_iter_init(&iov_iter, READ, &vq->iov[vc->out], vc->in, sizeof(rsp)); |
|
|
|
ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter); |
|
if (likely(ret == sizeof(rsp))) |
|
vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0); |
|
else |
|
pr_err("Faulted on virtio_scsi_ctrl_an_resp\n"); |
|
} |
|
|
|
static void |
|
vhost_scsi_ctl_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) |
|
{ |
|
struct vhost_scsi_tpg *tpg; |
|
union { |
|
__virtio32 type; |
|
struct virtio_scsi_ctrl_an_req an; |
|
struct virtio_scsi_ctrl_tmf_req tmf; |
|
} v_req; |
|
struct vhost_scsi_ctx vc; |
|
size_t typ_size; |
|
int ret, c = 0; |
|
|
|
mutex_lock(&vq->mutex); |
|
/* |
|
* We can handle the vq only after the endpoint is setup by calling the |
|
* VHOST_SCSI_SET_ENDPOINT ioctl. |
|
*/ |
|
if (!vhost_vq_get_backend(vq)) |
|
goto out; |
|
|
|
memset(&vc, 0, sizeof(vc)); |
|
|
|
vhost_disable_notify(&vs->dev, vq); |
|
|
|
do { |
|
ret = vhost_scsi_get_desc(vs, vq, &vc); |
|
if (ret) |
|
goto err; |
|
|
|
/* |
|
* Get the request type first in order to setup |
|
* other parameters dependent on the type. |
|
*/ |
|
vc.req = &v_req.type; |
|
typ_size = sizeof(v_req.type); |
|
|
|
if (unlikely(!copy_from_iter_full(vc.req, typ_size, |
|
&vc.out_iter))) { |
|
vq_err(vq, "Faulted on copy_from_iter tmf type\n"); |
|
/* |
|
* The size of the response buffer depends on the |
|
* request type and must be validated against it. |
|
* Since the request type is not known, don't send |
|
* a response. |
|
*/ |
|
continue; |
|
} |
|
|
|
switch (vhost32_to_cpu(vq, v_req.type)) { |
|
case VIRTIO_SCSI_T_TMF: |
|
vc.req = &v_req.tmf; |
|
vc.req_size = sizeof(struct virtio_scsi_ctrl_tmf_req); |
|
vc.rsp_size = sizeof(struct virtio_scsi_ctrl_tmf_resp); |
|
vc.lunp = &v_req.tmf.lun[0]; |
|
vc.target = &v_req.tmf.lun[1]; |
|
break; |
|
case VIRTIO_SCSI_T_AN_QUERY: |
|
case VIRTIO_SCSI_T_AN_SUBSCRIBE: |
|
vc.req = &v_req.an; |
|
vc.req_size = sizeof(struct virtio_scsi_ctrl_an_req); |
|
vc.rsp_size = sizeof(struct virtio_scsi_ctrl_an_resp); |
|
vc.lunp = &v_req.an.lun[0]; |
|
vc.target = NULL; |
|
break; |
|
default: |
|
vq_err(vq, "Unknown control request %d", v_req.type); |
|
continue; |
|
} |
|
|
|
/* |
|
* Validate the size of request and response buffers. |
|
* Check for a sane response buffer so we can report |
|
* early errors back to the guest. |
|
*/ |
|
ret = vhost_scsi_chk_size(vq, &vc); |
|
if (ret) |
|
goto err; |
|
|
|
/* |
|
* Get the rest of the request now that its size is known. |
|
*/ |
|
vc.req += typ_size; |
|
vc.req_size -= typ_size; |
|
|
|
ret = vhost_scsi_get_req(vq, &vc, &tpg); |
|
if (ret) |
|
goto err; |
|
|
|
if (v_req.type == VIRTIO_SCSI_T_TMF) |
|
vhost_scsi_handle_tmf(vs, tpg, vq, &v_req.tmf, &vc); |
|
else |
|
vhost_scsi_send_an_resp(vs, vq, &vc); |
|
err: |
|
/* |
|
* ENXIO: No more requests, or read error, wait for next kick |
|
* EINVAL: Invalid response buffer, drop the request |
|
* EIO: Respond with bad target |
|
* EAGAIN: Pending request |
|
*/ |
|
if (ret == -ENXIO) |
|
break; |
|
else if (ret == -EIO) |
|
vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out); |
|
} while (likely(!vhost_exceeds_weight(vq, ++c, 0))); |
|
out: |
|
mutex_unlock(&vq->mutex); |
|
} |
|
|
|
static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) |
|
{ |
|
struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
|
poll.work); |
|
struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); |
|
|
|
pr_debug("%s: The handling func for control queue.\n", __func__); |
|
vhost_scsi_ctl_handle_vq(vs, vq); |
|
} |
|
|
|
static void |
|
vhost_scsi_send_evt(struct vhost_scsi *vs, |
|
struct vhost_scsi_tpg *tpg, |
|
struct se_lun *lun, |
|
u32 event, |
|
u32 reason) |
|
{ |
|
struct vhost_scsi_evt *evt; |
|
|
|
evt = vhost_scsi_allocate_evt(vs, event, reason); |
|
if (!evt) |
|
return; |
|
|
|
if (tpg && lun) { |
|
/* TODO: share lun setup code with virtio-scsi.ko */ |
|
/* |
|
* Note: evt->event is zeroed when we allocate it and |
|
* lun[4-7] need to be zero according to virtio-scsi spec. |
|
*/ |
|
evt->event.lun[0] = 0x01; |
|
evt->event.lun[1] = tpg->tport_tpgt; |
|
if (lun->unpacked_lun >= 256) |
|
evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; |
|
evt->event.lun[3] = lun->unpacked_lun & 0xFF; |
|
} |
|
|
|
llist_add(&evt->list, &vs->vs_event_list); |
|
vhost_work_queue(&vs->dev, &vs->vs_event_work); |
|
} |
|
|
|
static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
|
{ |
|
struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
|
poll.work); |
|
struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); |
|
|
|
mutex_lock(&vq->mutex); |
|
if (!vhost_vq_get_backend(vq)) |
|
goto out; |
|
|
|
if (vs->vs_events_missed) |
|
vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); |
|
out: |
|
mutex_unlock(&vq->mutex); |
|
} |
|
|
|
static void vhost_scsi_handle_kick(struct vhost_work *work) |
|
{ |
|
struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
|
poll.work); |
|
struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); |
|
|
|
vhost_scsi_handle_vq(vs, vq); |
|
} |
|
|
|
static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) |
|
{ |
|
vhost_poll_flush(&vs->vqs[index].vq.poll); |
|
} |
|
|
|
/* Callers must hold dev mutex */ |
|
static void vhost_scsi_flush(struct vhost_scsi *vs) |
|
{ |
|
struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; |
|
int i; |
|
|
|
/* Init new inflight and remember the old inflight */ |
|
vhost_scsi_init_inflight(vs, old_inflight); |
|
|
|
/* |
|
* The inflight->kref was initialized to 1. We decrement it here to |
|
* indicate the start of the flush operation so that it will reach 0 |
|
* when all the reqs are finished. |
|
*/ |
|
for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
|
kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight); |
|
|
|
/* Flush both the vhost poll and vhost work */ |
|
for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
|
vhost_scsi_flush_vq(vs, i); |
|
vhost_work_flush(&vs->dev, &vs->vs_completion_work); |
|
vhost_work_flush(&vs->dev, &vs->vs_event_work); |
|
|
|
/* Wait for all reqs issued before the flush to be finished */ |
|
for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
|
wait_for_completion(&old_inflight[i]->comp); |
|
} |
|
|
|
static void vhost_scsi_destroy_vq_cmds(struct vhost_virtqueue *vq) |
|
{ |
|
struct vhost_scsi_virtqueue *svq = container_of(vq, |
|
struct vhost_scsi_virtqueue, vq); |
|
struct vhost_scsi_cmd *tv_cmd; |
|
unsigned int i; |
|
|
|
if (!svq->scsi_cmds) |
|
return; |
|
|
|
for (i = 0; i < svq->max_cmds; i++) { |
|
tv_cmd = &svq->scsi_cmds[i]; |
|
|
|
kfree(tv_cmd->tvc_sgl); |
|
kfree(tv_cmd->tvc_prot_sgl); |
|
kfree(tv_cmd->tvc_upages); |
|
} |
|
|
|
sbitmap_free(&svq->scsi_tags); |
|
kfree(svq->scsi_cmds); |
|
svq->scsi_cmds = NULL; |
|
} |
|
|
|
static int vhost_scsi_setup_vq_cmds(struct vhost_virtqueue *vq, int max_cmds) |
|
{ |
|
struct vhost_scsi_virtqueue *svq = container_of(vq, |
|
struct vhost_scsi_virtqueue, vq); |
|
struct vhost_scsi_cmd *tv_cmd; |
|
unsigned int i; |
|
|
|
if (svq->scsi_cmds) |
|
return 0; |
|
|
|
if (sbitmap_init_node(&svq->scsi_tags, max_cmds, -1, GFP_KERNEL, |
|
NUMA_NO_NODE)) |
|
return -ENOMEM; |
|
svq->max_cmds = max_cmds; |
|
|
|
svq->scsi_cmds = kcalloc(max_cmds, sizeof(*tv_cmd), GFP_KERNEL); |
|
if (!svq->scsi_cmds) { |
|
sbitmap_free(&svq->scsi_tags); |
|
return -ENOMEM; |
|
} |
|
|
|
for (i = 0; i < max_cmds; i++) { |
|
tv_cmd = &svq->scsi_cmds[i]; |
|
|
|
tv_cmd->tvc_sgl = kcalloc(VHOST_SCSI_PREALLOC_SGLS, |
|
sizeof(struct scatterlist), |
|
GFP_KERNEL); |
|
if (!tv_cmd->tvc_sgl) { |
|
pr_err("Unable to allocate tv_cmd->tvc_sgl\n"); |
|
goto out; |
|
} |
|
|
|
tv_cmd->tvc_upages = kcalloc(VHOST_SCSI_PREALLOC_UPAGES, |
|
sizeof(struct page *), |
|
GFP_KERNEL); |
|
if (!tv_cmd->tvc_upages) { |
|
pr_err("Unable to allocate tv_cmd->tvc_upages\n"); |
|
goto out; |
|
} |
|
|
|
tv_cmd->tvc_prot_sgl = kcalloc(VHOST_SCSI_PREALLOC_PROT_SGLS, |
|
sizeof(struct scatterlist), |
|
GFP_KERNEL); |
|
if (!tv_cmd->tvc_prot_sgl) { |
|
pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n"); |
|
goto out; |
|
} |
|
} |
|
return 0; |
|
out: |
|
vhost_scsi_destroy_vq_cmds(vq); |
|
return -ENOMEM; |
|
} |
|
|
|
/* |
|
* Called from vhost_scsi_ioctl() context to walk the list of available |
|
* vhost_scsi_tpg with an active struct vhost_scsi_nexus |
|
* |
|
* The lock nesting rule is: |
|
* vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex |
|
*/ |
|
static int |
|
vhost_scsi_set_endpoint(struct vhost_scsi *vs, |
|
struct vhost_scsi_target *t) |
|
{ |
|
struct se_portal_group *se_tpg; |
|
struct vhost_scsi_tport *tv_tport; |
|
struct vhost_scsi_tpg *tpg; |
|
struct vhost_scsi_tpg **vs_tpg; |
|
struct vhost_virtqueue *vq; |
|
int index, ret, i, len; |
|
bool match = false; |
|
|
|
mutex_lock(&vhost_scsi_mutex); |
|
mutex_lock(&vs->dev.mutex); |
|
|
|
/* Verify that ring has been setup correctly. */ |
|
for (index = 0; index < vs->dev.nvqs; ++index) { |
|
/* Verify that ring has been setup correctly. */ |
|
if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
|
ret = -EFAULT; |
|
goto out; |
|
} |
|
} |
|
|
|
len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
|
vs_tpg = kzalloc(len, GFP_KERNEL); |
|
if (!vs_tpg) { |
|
ret = -ENOMEM; |
|
goto out; |
|
} |
|
if (vs->vs_tpg) |
|
memcpy(vs_tpg, vs->vs_tpg, len); |
|
|
|
list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) { |
|
mutex_lock(&tpg->tv_tpg_mutex); |
|
if (!tpg->tpg_nexus) { |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
continue; |
|
} |
|
if (tpg->tv_tpg_vhost_count != 0) { |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
continue; |
|
} |
|
tv_tport = tpg->tport; |
|
|
|
if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
|
if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
ret = -EEXIST; |
|
goto undepend; |
|
} |
|
/* |
|
* In order to ensure individual vhost-scsi configfs |
|
* groups cannot be removed while in use by vhost ioctl, |
|
* go ahead and take an explicit se_tpg->tpg_group.cg_item |
|
* dependency now. |
|
*/ |
|
se_tpg = &tpg->se_tpg; |
|
ret = target_depend_item(&se_tpg->tpg_group.cg_item); |
|
if (ret) { |
|
pr_warn("target_depend_item() failed: %d\n", ret); |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
goto undepend; |
|
} |
|
tpg->tv_tpg_vhost_count++; |
|
tpg->vhost_scsi = vs; |
|
vs_tpg[tpg->tport_tpgt] = tpg; |
|
match = true; |
|
} |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
} |
|
|
|
if (match) { |
|
memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, |
|
sizeof(vs->vs_vhost_wwpn)); |
|
|
|
for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { |
|
vq = &vs->vqs[i].vq; |
|
if (!vhost_vq_is_setup(vq)) |
|
continue; |
|
|
|
ret = vhost_scsi_setup_vq_cmds(vq, vq->num); |
|
if (ret) |
|
goto destroy_vq_cmds; |
|
} |
|
|
|
for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
|
vq = &vs->vqs[i].vq; |
|
mutex_lock(&vq->mutex); |
|
vhost_vq_set_backend(vq, vs_tpg); |
|
vhost_vq_init_access(vq); |
|
mutex_unlock(&vq->mutex); |
|
} |
|
ret = 0; |
|
} else { |
|
ret = -EEXIST; |
|
} |
|
|
|
/* |
|
* Act as synchronize_rcu to make sure access to |
|
* old vs->vs_tpg is finished. |
|
*/ |
|
vhost_scsi_flush(vs); |
|
kfree(vs->vs_tpg); |
|
vs->vs_tpg = vs_tpg; |
|
goto out; |
|
|
|
destroy_vq_cmds: |
|
for (i--; i >= VHOST_SCSI_VQ_IO; i--) { |
|
if (!vhost_vq_get_backend(&vs->vqs[i].vq)) |
|
vhost_scsi_destroy_vq_cmds(&vs->vqs[i].vq); |
|
} |
|
undepend: |
|
for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
|
tpg = vs_tpg[i]; |
|
if (tpg) { |
|
tpg->tv_tpg_vhost_count--; |
|
target_undepend_item(&tpg->se_tpg.tpg_group.cg_item); |
|
} |
|
} |
|
kfree(vs_tpg); |
|
out: |
|
mutex_unlock(&vs->dev.mutex); |
|
mutex_unlock(&vhost_scsi_mutex); |
|
return ret; |
|
} |
|
|
|
static int |
|
vhost_scsi_clear_endpoint(struct vhost_scsi *vs, |
|
struct vhost_scsi_target *t) |
|
{ |
|
struct se_portal_group *se_tpg; |
|
struct vhost_scsi_tport *tv_tport; |
|
struct vhost_scsi_tpg *tpg; |
|
struct vhost_virtqueue *vq; |
|
bool match = false; |
|
int index, ret, i; |
|
u8 target; |
|
|
|
mutex_lock(&vhost_scsi_mutex); |
|
mutex_lock(&vs->dev.mutex); |
|
/* Verify that ring has been setup correctly. */ |
|
for (index = 0; index < vs->dev.nvqs; ++index) { |
|
if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
|
ret = -EFAULT; |
|
goto err_dev; |
|
} |
|
} |
|
|
|
if (!vs->vs_tpg) { |
|
ret = 0; |
|
goto err_dev; |
|
} |
|
|
|
for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
|
target = i; |
|
tpg = vs->vs_tpg[target]; |
|
if (!tpg) |
|
continue; |
|
|
|
mutex_lock(&tpg->tv_tpg_mutex); |
|
tv_tport = tpg->tport; |
|
if (!tv_tport) { |
|
ret = -ENODEV; |
|
goto err_tpg; |
|
} |
|
|
|
if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
|
pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu" |
|
" does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", |
|
tv_tport->tport_name, tpg->tport_tpgt, |
|
t->vhost_wwpn, t->vhost_tpgt); |
|
ret = -EINVAL; |
|
goto err_tpg; |
|
} |
|
tpg->tv_tpg_vhost_count--; |
|
tpg->vhost_scsi = NULL; |
|
vs->vs_tpg[target] = NULL; |
|
match = true; |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
/* |
|
* Release se_tpg->tpg_group.cg_item configfs dependency now |
|
* to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur. |
|
*/ |
|
se_tpg = &tpg->se_tpg; |
|
target_undepend_item(&se_tpg->tpg_group.cg_item); |
|
} |
|
if (match) { |
|
for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
|
vq = &vs->vqs[i].vq; |
|
mutex_lock(&vq->mutex); |
|
vhost_vq_set_backend(vq, NULL); |
|
mutex_unlock(&vq->mutex); |
|
/* |
|
* Make sure cmds are not running before tearing them |
|
* down. |
|
*/ |
|
vhost_scsi_flush(vs); |
|
vhost_scsi_destroy_vq_cmds(vq); |
|
} |
|
} |
|
/* |
|
* Act as synchronize_rcu to make sure access to |
|
* old vs->vs_tpg is finished. |
|
*/ |
|
vhost_scsi_flush(vs); |
|
kfree(vs->vs_tpg); |
|
vs->vs_tpg = NULL; |
|
WARN_ON(vs->vs_events_nr); |
|
mutex_unlock(&vs->dev.mutex); |
|
mutex_unlock(&vhost_scsi_mutex); |
|
return 0; |
|
|
|
err_tpg: |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
err_dev: |
|
mutex_unlock(&vs->dev.mutex); |
|
mutex_unlock(&vhost_scsi_mutex); |
|
return ret; |
|
} |
|
|
|
static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
|
{ |
|
struct vhost_virtqueue *vq; |
|
int i; |
|
|
|
if (features & ~VHOST_SCSI_FEATURES) |
|
return -EOPNOTSUPP; |
|
|
|
mutex_lock(&vs->dev.mutex); |
|
if ((features & (1 << VHOST_F_LOG_ALL)) && |
|
!vhost_log_access_ok(&vs->dev)) { |
|
mutex_unlock(&vs->dev.mutex); |
|
return -EFAULT; |
|
} |
|
|
|
for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
|
vq = &vs->vqs[i].vq; |
|
mutex_lock(&vq->mutex); |
|
vq->acked_features = features; |
|
mutex_unlock(&vq->mutex); |
|
} |
|
mutex_unlock(&vs->dev.mutex); |
|
return 0; |
|
} |
|
|
|
static int vhost_scsi_open(struct inode *inode, struct file *f) |
|
{ |
|
struct vhost_scsi *vs; |
|
struct vhost_virtqueue **vqs; |
|
int r = -ENOMEM, i; |
|
|
|
vs = kvzalloc(sizeof(*vs), GFP_KERNEL); |
|
if (!vs) |
|
goto err_vs; |
|
|
|
vqs = kmalloc_array(VHOST_SCSI_MAX_VQ, sizeof(*vqs), GFP_KERNEL); |
|
if (!vqs) |
|
goto err_vqs; |
|
|
|
vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work); |
|
vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work); |
|
|
|
vs->vs_events_nr = 0; |
|
vs->vs_events_missed = false; |
|
|
|
vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq; |
|
vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
|
vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; |
|
vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; |
|
for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { |
|
vqs[i] = &vs->vqs[i].vq; |
|
vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; |
|
} |
|
vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ, UIO_MAXIOV, |
|
VHOST_SCSI_WEIGHT, 0, true, NULL); |
|
|
|
vhost_scsi_init_inflight(vs, NULL); |
|
|
|
f->private_data = vs; |
|
return 0; |
|
|
|
err_vqs: |
|
kvfree(vs); |
|
err_vs: |
|
return r; |
|
} |
|
|
|
static int vhost_scsi_release(struct inode *inode, struct file *f) |
|
{ |
|
struct vhost_scsi *vs = f->private_data; |
|
struct vhost_scsi_target t; |
|
|
|
mutex_lock(&vs->dev.mutex); |
|
memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); |
|
mutex_unlock(&vs->dev.mutex); |
|
vhost_scsi_clear_endpoint(vs, &t); |
|
vhost_dev_stop(&vs->dev); |
|
vhost_dev_cleanup(&vs->dev); |
|
/* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ |
|
vhost_scsi_flush(vs); |
|
kfree(vs->dev.vqs); |
|
kvfree(vs); |
|
return 0; |
|
} |
|
|
|
static long |
|
vhost_scsi_ioctl(struct file *f, |
|
unsigned int ioctl, |
|
unsigned long arg) |
|
{ |
|
struct vhost_scsi *vs = f->private_data; |
|
struct vhost_scsi_target backend; |
|
void __user *argp = (void __user *)arg; |
|
u64 __user *featurep = argp; |
|
u32 __user *eventsp = argp; |
|
u32 events_missed; |
|
u64 features; |
|
int r, abi_version = VHOST_SCSI_ABI_VERSION; |
|
struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
|
|
|
switch (ioctl) { |
|
case VHOST_SCSI_SET_ENDPOINT: |
|
if (copy_from_user(&backend, argp, sizeof backend)) |
|
return -EFAULT; |
|
if (backend.reserved != 0) |
|
return -EOPNOTSUPP; |
|
|
|
return vhost_scsi_set_endpoint(vs, &backend); |
|
case VHOST_SCSI_CLEAR_ENDPOINT: |
|
if (copy_from_user(&backend, argp, sizeof backend)) |
|
return -EFAULT; |
|
if (backend.reserved != 0) |
|
return -EOPNOTSUPP; |
|
|
|
return vhost_scsi_clear_endpoint(vs, &backend); |
|
case VHOST_SCSI_GET_ABI_VERSION: |
|
if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
|
return -EFAULT; |
|
return 0; |
|
case VHOST_SCSI_SET_EVENTS_MISSED: |
|
if (get_user(events_missed, eventsp)) |
|
return -EFAULT; |
|
mutex_lock(&vq->mutex); |
|
vs->vs_events_missed = events_missed; |
|
mutex_unlock(&vq->mutex); |
|
return 0; |
|
case VHOST_SCSI_GET_EVENTS_MISSED: |
|
mutex_lock(&vq->mutex); |
|
events_missed = vs->vs_events_missed; |
|
mutex_unlock(&vq->mutex); |
|
if (put_user(events_missed, eventsp)) |
|
return -EFAULT; |
|
return 0; |
|
case VHOST_GET_FEATURES: |
|
features = VHOST_SCSI_FEATURES; |
|
if (copy_to_user(featurep, &features, sizeof features)) |
|
return -EFAULT; |
|
return 0; |
|
case VHOST_SET_FEATURES: |
|
if (copy_from_user(&features, featurep, sizeof features)) |
|
return -EFAULT; |
|
return vhost_scsi_set_features(vs, features); |
|
default: |
|
mutex_lock(&vs->dev.mutex); |
|
r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
|
/* TODO: flush backend after dev ioctl. */ |
|
if (r == -ENOIOCTLCMD) |
|
r = vhost_vring_ioctl(&vs->dev, ioctl, argp); |
|
mutex_unlock(&vs->dev.mutex); |
|
return r; |
|
} |
|
} |
|
|
|
static const struct file_operations vhost_scsi_fops = { |
|
.owner = THIS_MODULE, |
|
.release = vhost_scsi_release, |
|
.unlocked_ioctl = vhost_scsi_ioctl, |
|
.compat_ioctl = compat_ptr_ioctl, |
|
.open = vhost_scsi_open, |
|
.llseek = noop_llseek, |
|
}; |
|
|
|
static struct miscdevice vhost_scsi_misc = { |
|
MISC_DYNAMIC_MINOR, |
|
"vhost-scsi", |
|
&vhost_scsi_fops, |
|
}; |
|
|
|
static int __init vhost_scsi_register(void) |
|
{ |
|
return misc_register(&vhost_scsi_misc); |
|
} |
|
|
|
static void vhost_scsi_deregister(void) |
|
{ |
|
misc_deregister(&vhost_scsi_misc); |
|
} |
|
|
|
static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport) |
|
{ |
|
switch (tport->tport_proto_id) { |
|
case SCSI_PROTOCOL_SAS: |
|
return "SAS"; |
|
case SCSI_PROTOCOL_FCP: |
|
return "FCP"; |
|
case SCSI_PROTOCOL_ISCSI: |
|
return "iSCSI"; |
|
default: |
|
break; |
|
} |
|
|
|
return "Unknown"; |
|
} |
|
|
|
static void |
|
vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg, |
|
struct se_lun *lun, bool plug) |
|
{ |
|
|
|
struct vhost_scsi *vs = tpg->vhost_scsi; |
|
struct vhost_virtqueue *vq; |
|
u32 reason; |
|
|
|
if (!vs) |
|
return; |
|
|
|
mutex_lock(&vs->dev.mutex); |
|
|
|
if (plug) |
|
reason = VIRTIO_SCSI_EVT_RESET_RESCAN; |
|
else |
|
reason = VIRTIO_SCSI_EVT_RESET_REMOVED; |
|
|
|
vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
|
mutex_lock(&vq->mutex); |
|
if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG)) |
|
vhost_scsi_send_evt(vs, tpg, lun, |
|
VIRTIO_SCSI_T_TRANSPORT_RESET, reason); |
|
mutex_unlock(&vq->mutex); |
|
mutex_unlock(&vs->dev.mutex); |
|
} |
|
|
|
static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
|
{ |
|
vhost_scsi_do_plug(tpg, lun, true); |
|
} |
|
|
|
static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
|
{ |
|
vhost_scsi_do_plug(tpg, lun, false); |
|
} |
|
|
|
static int vhost_scsi_port_link(struct se_portal_group *se_tpg, |
|
struct se_lun *lun) |
|
{ |
|
struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
|
struct vhost_scsi_tpg, se_tpg); |
|
struct vhost_scsi_tmf *tmf; |
|
|
|
tmf = kzalloc(sizeof(*tmf), GFP_KERNEL); |
|
if (!tmf) |
|
return -ENOMEM; |
|
INIT_LIST_HEAD(&tmf->queue_entry); |
|
vhost_work_init(&tmf->vwork, vhost_scsi_tmf_resp_work); |
|
|
|
mutex_lock(&vhost_scsi_mutex); |
|
|
|
mutex_lock(&tpg->tv_tpg_mutex); |
|
tpg->tv_tpg_port_count++; |
|
list_add_tail(&tmf->queue_entry, &tpg->tmf_queue); |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
|
|
vhost_scsi_hotplug(tpg, lun); |
|
|
|
mutex_unlock(&vhost_scsi_mutex); |
|
|
|
return 0; |
|
} |
|
|
|
static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg, |
|
struct se_lun *lun) |
|
{ |
|
struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
|
struct vhost_scsi_tpg, se_tpg); |
|
struct vhost_scsi_tmf *tmf; |
|
|
|
mutex_lock(&vhost_scsi_mutex); |
|
|
|
mutex_lock(&tpg->tv_tpg_mutex); |
|
tpg->tv_tpg_port_count--; |
|
tmf = list_first_entry(&tpg->tmf_queue, struct vhost_scsi_tmf, |
|
queue_entry); |
|
list_del(&tmf->queue_entry); |
|
kfree(tmf); |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
|
|
vhost_scsi_hotunplug(tpg, lun); |
|
|
|
mutex_unlock(&vhost_scsi_mutex); |
|
} |
|
|
|
static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store( |
|
struct config_item *item, const char *page, size_t count) |
|
{ |
|
struct se_portal_group *se_tpg = attrib_to_tpg(item); |
|
struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
|
struct vhost_scsi_tpg, se_tpg); |
|
unsigned long val; |
|
int ret = kstrtoul(page, 0, &val); |
|
|
|
if (ret) { |
|
pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); |
|
return ret; |
|
} |
|
if (val != 0 && val != 1 && val != 3) { |
|
pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val); |
|
return -EINVAL; |
|
} |
|
tpg->tv_fabric_prot_type = val; |
|
|
|
return count; |
|
} |
|
|
|
static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show( |
|
struct config_item *item, char *page) |
|
{ |
|
struct se_portal_group *se_tpg = attrib_to_tpg(item); |
|
struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
|
struct vhost_scsi_tpg, se_tpg); |
|
|
|
return sprintf(page, "%d\n", tpg->tv_fabric_prot_type); |
|
} |
|
|
|
CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type); |
|
|
|
static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = { |
|
&vhost_scsi_tpg_attrib_attr_fabric_prot_type, |
|
NULL, |
|
}; |
|
|
|
static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg, |
|
const char *name) |
|
{ |
|
struct vhost_scsi_nexus *tv_nexus; |
|
|
|
mutex_lock(&tpg->tv_tpg_mutex); |
|
if (tpg->tpg_nexus) { |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
pr_debug("tpg->tpg_nexus already exists\n"); |
|
return -EEXIST; |
|
} |
|
|
|
tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); |
|
if (!tv_nexus) { |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
pr_err("Unable to allocate struct vhost_scsi_nexus\n"); |
|
return -ENOMEM; |
|
} |
|
/* |
|
* Since we are running in 'demo mode' this call with generate a |
|
* struct se_node_acl for the vhost_scsi struct se_portal_group with |
|
* the SCSI Initiator port name of the passed configfs group 'name'. |
|
*/ |
|
tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, 0, 0, |
|
TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS, |
|
(unsigned char *)name, tv_nexus, NULL); |
|
if (IS_ERR(tv_nexus->tvn_se_sess)) { |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
kfree(tv_nexus); |
|
return -ENOMEM; |
|
} |
|
tpg->tpg_nexus = tv_nexus; |
|
|
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
return 0; |
|
} |
|
|
|
static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg) |
|
{ |
|
struct se_session *se_sess; |
|
struct vhost_scsi_nexus *tv_nexus; |
|
|
|
mutex_lock(&tpg->tv_tpg_mutex); |
|
tv_nexus = tpg->tpg_nexus; |
|
if (!tv_nexus) { |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
return -ENODEV; |
|
} |
|
|
|
se_sess = tv_nexus->tvn_se_sess; |
|
if (!se_sess) { |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
return -ENODEV; |
|
} |
|
|
|
if (tpg->tv_tpg_port_count != 0) { |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
pr_err("Unable to remove TCM_vhost I_T Nexus with" |
|
" active TPG port count: %d\n", |
|
tpg->tv_tpg_port_count); |
|
return -EBUSY; |
|
} |
|
|
|
if (tpg->tv_tpg_vhost_count != 0) { |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
pr_err("Unable to remove TCM_vhost I_T Nexus with" |
|
" active TPG vhost count: %d\n", |
|
tpg->tv_tpg_vhost_count); |
|
return -EBUSY; |
|
} |
|
|
|
pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
|
" %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport), |
|
tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
|
|
|
/* |
|
* Release the SCSI I_T Nexus to the emulated vhost Target Port |
|
*/ |
|
target_remove_session(se_sess); |
|
tpg->tpg_nexus = NULL; |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
|
|
kfree(tv_nexus); |
|
return 0; |
|
} |
|
|
|
static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page) |
|
{ |
|
struct se_portal_group *se_tpg = to_tpg(item); |
|
struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
|
struct vhost_scsi_tpg, se_tpg); |
|
struct vhost_scsi_nexus *tv_nexus; |
|
ssize_t ret; |
|
|
|
mutex_lock(&tpg->tv_tpg_mutex); |
|
tv_nexus = tpg->tpg_nexus; |
|
if (!tv_nexus) { |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
return -ENODEV; |
|
} |
|
ret = snprintf(page, PAGE_SIZE, "%s\n", |
|
tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
|
mutex_unlock(&tpg->tv_tpg_mutex); |
|
|
|
return ret; |
|
} |
|
|
|
static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item, |
|
const char *page, size_t count) |
|
{ |
|
struct se_portal_group *se_tpg = to_tpg(item); |
|
struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
|
struct vhost_scsi_tpg, se_tpg); |
|
struct vhost_scsi_tport *tport_wwn = tpg->tport; |
|
unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr; |
|
int ret; |
|
/* |
|
* Shutdown the active I_T nexus if 'NULL' is passed.. |
|
*/ |
|
if (!strncmp(page, "NULL", 4)) { |
|
ret = vhost_scsi_drop_nexus(tpg); |
|
return (!ret) ? count : ret; |
|
} |
|
/* |
|
* Otherwise make sure the passed virtual Initiator port WWN matches |
|
* the fabric protocol_id set in vhost_scsi_make_tport(), and call |
|
* vhost_scsi_make_nexus(). |
|
*/ |
|
if (strlen(page) >= VHOST_SCSI_NAMELEN) { |
|
pr_err("Emulated NAA Sas Address: %s, exceeds" |
|
" max: %d\n", page, VHOST_SCSI_NAMELEN); |
|
return -EINVAL; |
|
} |
|
snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page); |
|
|
|
ptr = strstr(i_port, "naa."); |
|
if (ptr) { |
|
if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { |
|
pr_err("Passed SAS Initiator Port %s does not" |
|
" match target port protoid: %s\n", i_port, |
|
vhost_scsi_dump_proto_id(tport_wwn)); |
|
return -EINVAL; |
|
} |
|
port_ptr = &i_port[0]; |
|
goto check_newline; |
|
} |
|
ptr = strstr(i_port, "fc."); |
|
if (ptr) { |
|
if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { |
|
pr_err("Passed FCP Initiator Port %s does not" |
|
" match target port protoid: %s\n", i_port, |
|
vhost_scsi_dump_proto_id(tport_wwn)); |
|
return -EINVAL; |
|
} |
|
port_ptr = &i_port[3]; /* Skip over "fc." */ |
|
goto check_newline; |
|
} |
|
ptr = strstr(i_port, "iqn."); |
|
if (ptr) { |
|
if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { |
|
pr_err("Passed iSCSI Initiator Port %s does not" |
|
" match target port protoid: %s\n", i_port, |
|
vhost_scsi_dump_proto_id(tport_wwn)); |
|
return -EINVAL; |
|
} |
|
port_ptr = &i_port[0]; |
|
goto check_newline; |
|
} |
|
pr_err("Unable to locate prefix for emulated Initiator Port:" |
|
" %s\n", i_port); |
|
return -EINVAL; |
|
/* |
|
* Clear any trailing newline for the NAA WWN |
|
*/ |
|
check_newline: |
|
if (i_port[strlen(i_port)-1] == '\n') |
|
i_port[strlen(i_port)-1] = '\0'; |
|
|
|
ret = vhost_scsi_make_nexus(tpg, port_ptr); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return count; |
|
} |
|
|
|
CONFIGFS_ATTR(vhost_scsi_tpg_, nexus); |
|
|
|
static struct configfs_attribute *vhost_scsi_tpg_attrs[] = { |
|
&vhost_scsi_tpg_attr_nexus, |
|
NULL, |
|
}; |
|
|
|
static struct se_portal_group * |
|
vhost_scsi_make_tpg(struct se_wwn *wwn, const char *name) |
|
{ |
|
struct vhost_scsi_tport *tport = container_of(wwn, |
|
struct vhost_scsi_tport, tport_wwn); |
|
|
|
struct vhost_scsi_tpg *tpg; |
|
u16 tpgt; |
|
int ret; |
|
|
|
if (strstr(name, "tpgt_") != name) |
|
return ERR_PTR(-EINVAL); |
|
if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET) |
|
return ERR_PTR(-EINVAL); |
|
|
|
tpg = kzalloc(sizeof(*tpg), GFP_KERNEL); |
|
if (!tpg) { |
|
pr_err("Unable to allocate struct vhost_scsi_tpg"); |
|
return ERR_PTR(-ENOMEM); |
|
} |
|
mutex_init(&tpg->tv_tpg_mutex); |
|
INIT_LIST_HEAD(&tpg->tv_tpg_list); |
|
INIT_LIST_HEAD(&tpg->tmf_queue); |
|
tpg->tport = tport; |
|
tpg->tport_tpgt = tpgt; |
|
|
|
ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id); |
|
if (ret < 0) { |
|
kfree(tpg); |
|
return NULL; |
|
} |
|
mutex_lock(&vhost_scsi_mutex); |
|
list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list); |
|
mutex_unlock(&vhost_scsi_mutex); |
|
|
|
return &tpg->se_tpg; |
|
} |
|
|
|
static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg) |
|
{ |
|
struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
|
struct vhost_scsi_tpg, se_tpg); |
|
|
|
mutex_lock(&vhost_scsi_mutex); |
|
list_del(&tpg->tv_tpg_list); |
|
mutex_unlock(&vhost_scsi_mutex); |
|
/* |
|
* Release the virtual I_T Nexus for this vhost TPG |
|
*/ |
|
vhost_scsi_drop_nexus(tpg); |
|
/* |
|
* Deregister the se_tpg from TCM.. |
|
*/ |
|
core_tpg_deregister(se_tpg); |
|
kfree(tpg); |
|
} |
|
|
|
static struct se_wwn * |
|
vhost_scsi_make_tport(struct target_fabric_configfs *tf, |
|
struct config_group *group, |
|
const char *name) |
|
{ |
|
struct vhost_scsi_tport *tport; |
|
char *ptr; |
|
u64 wwpn = 0; |
|
int off = 0; |
|
|
|
/* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0) |
|
return ERR_PTR(-EINVAL); */ |
|
|
|
tport = kzalloc(sizeof(*tport), GFP_KERNEL); |
|
if (!tport) { |
|
pr_err("Unable to allocate struct vhost_scsi_tport"); |
|
return ERR_PTR(-ENOMEM); |
|
} |
|
tport->tport_wwpn = wwpn; |
|
/* |
|
* Determine the emulated Protocol Identifier and Target Port Name |
|
* based on the incoming configfs directory name. |
|
*/ |
|
ptr = strstr(name, "naa."); |
|
if (ptr) { |
|
tport->tport_proto_id = SCSI_PROTOCOL_SAS; |
|
goto check_len; |
|
} |
|
ptr = strstr(name, "fc."); |
|
if (ptr) { |
|
tport->tport_proto_id = SCSI_PROTOCOL_FCP; |
|
off = 3; /* Skip over "fc." */ |
|
goto check_len; |
|
} |
|
ptr = strstr(name, "iqn."); |
|
if (ptr) { |
|
tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; |
|
goto check_len; |
|
} |
|
|
|
pr_err("Unable to locate prefix for emulated Target Port:" |
|
" %s\n", name); |
|
kfree(tport); |
|
return ERR_PTR(-EINVAL); |
|
|
|
check_len: |
|
if (strlen(name) >= VHOST_SCSI_NAMELEN) { |
|
pr_err("Emulated %s Address: %s, exceeds" |
|
" max: %d\n", name, vhost_scsi_dump_proto_id(tport), |
|
VHOST_SCSI_NAMELEN); |
|
kfree(tport); |
|
return ERR_PTR(-EINVAL); |
|
} |
|
snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]); |
|
|
|
pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" |
|
" %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name); |
|
|
|
return &tport->tport_wwn; |
|
} |
|
|
|
static void vhost_scsi_drop_tport(struct se_wwn *wwn) |
|
{ |
|
struct vhost_scsi_tport *tport = container_of(wwn, |
|
struct vhost_scsi_tport, tport_wwn); |
|
|
|
pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" |
|
" %s Address: %s\n", vhost_scsi_dump_proto_id(tport), |
|
tport->tport_name); |
|
|
|
kfree(tport); |
|
} |
|
|
|
static ssize_t |
|
vhost_scsi_wwn_version_show(struct config_item *item, char *page) |
|
{ |
|
return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" |
|
"on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
|
utsname()->machine); |
|
} |
|
|
|
CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version); |
|
|
|
static struct configfs_attribute *vhost_scsi_wwn_attrs[] = { |
|
&vhost_scsi_wwn_attr_version, |
|
NULL, |
|
}; |
|
|
|
static const struct target_core_fabric_ops vhost_scsi_ops = { |
|
.module = THIS_MODULE, |
|
.fabric_name = "vhost", |
|
.max_data_sg_nents = VHOST_SCSI_PREALLOC_SGLS, |
|
.tpg_get_wwn = vhost_scsi_get_fabric_wwn, |
|
.tpg_get_tag = vhost_scsi_get_tpgt, |
|
.tpg_check_demo_mode = vhost_scsi_check_true, |
|
.tpg_check_demo_mode_cache = vhost_scsi_check_true, |
|
.tpg_check_demo_mode_write_protect = vhost_scsi_check_false, |
|
.tpg_check_prod_mode_write_protect = vhost_scsi_check_false, |
|
.tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only, |
|
.tpg_get_inst_index = vhost_scsi_tpg_get_inst_index, |
|
.release_cmd = vhost_scsi_release_cmd, |
|
.check_stop_free = vhost_scsi_check_stop_free, |
|
.sess_get_index = vhost_scsi_sess_get_index, |
|
.sess_get_initiator_sid = NULL, |
|
.write_pending = vhost_scsi_write_pending, |
|
.set_default_node_attributes = vhost_scsi_set_default_node_attrs, |
|
.get_cmd_state = vhost_scsi_get_cmd_state, |
|
.queue_data_in = vhost_scsi_queue_data_in, |
|
.queue_status = vhost_scsi_queue_status, |
|
.queue_tm_rsp = vhost_scsi_queue_tm_rsp, |
|
.aborted_task = vhost_scsi_aborted_task, |
|
/* |
|
* Setup callers for generic logic in target_core_fabric_configfs.c |
|
*/ |
|
.fabric_make_wwn = vhost_scsi_make_tport, |
|
.fabric_drop_wwn = vhost_scsi_drop_tport, |
|
.fabric_make_tpg = vhost_scsi_make_tpg, |
|
.fabric_drop_tpg = vhost_scsi_drop_tpg, |
|
.fabric_post_link = vhost_scsi_port_link, |
|
.fabric_pre_unlink = vhost_scsi_port_unlink, |
|
|
|
.tfc_wwn_attrs = vhost_scsi_wwn_attrs, |
|
.tfc_tpg_base_attrs = vhost_scsi_tpg_attrs, |
|
.tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs, |
|
}; |
|
|
|
static int __init vhost_scsi_init(void) |
|
{ |
|
int ret = -ENOMEM; |
|
|
|
pr_debug("TCM_VHOST fabric module %s on %s/%s" |
|
" on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
|
utsname()->machine); |
|
|
|
/* |
|
* Use our own dedicated workqueue for submitting I/O into |
|
* target core to avoid contention within system_wq. |
|
*/ |
|
vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0); |
|
if (!vhost_scsi_workqueue) |
|
goto out; |
|
|
|
ret = vhost_scsi_register(); |
|
if (ret < 0) |
|
goto out_destroy_workqueue; |
|
|
|
ret = target_register_template(&vhost_scsi_ops); |
|
if (ret < 0) |
|
goto out_vhost_scsi_deregister; |
|
|
|
return 0; |
|
|
|
out_vhost_scsi_deregister: |
|
vhost_scsi_deregister(); |
|
out_destroy_workqueue: |
|
destroy_workqueue(vhost_scsi_workqueue); |
|
out: |
|
return ret; |
|
}; |
|
|
|
static void vhost_scsi_exit(void) |
|
{ |
|
target_unregister_template(&vhost_scsi_ops); |
|
vhost_scsi_deregister(); |
|
destroy_workqueue(vhost_scsi_workqueue); |
|
}; |
|
|
|
MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
|
MODULE_ALIAS("tcm_vhost"); |
|
MODULE_LICENSE("GPL"); |
|
module_init(vhost_scsi_init); |
|
module_exit(vhost_scsi_exit);
|
|
|