mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Pull SCSI target updates from Nicholas Bellinger: "The highlights this round include: - Add support for T10 PI pass-through between vhost-scsi + virtio-scsi (MST + Paolo + MKP + nab) - Add support for T10 PI in qla2xxx target mode (Quinn + MKP + hch + nab, merged through scsi.git) - Add support for percpu-ida pre-allocation in qla2xxx target code (Quinn + nab) - A number of iser-target fixes related to hardening the network portal shutdown path (Sagi + Slava) - Fix response length residual handling for a number of control CDBs (Roland + Christophe V.) - Various iscsi RFC conformance fixes in the CHAP authentication path (Tejas and Calsoft folks + nab) - Return TASK_SET_FULL status for tcm_fc(FCoE) DataIn + Response failures (Vasu + Jun + nab) - Fix long-standing ABORT_TASK + session reset hang (nab) - Convert iser-initiator + iser-target to include T10 bytes into EDTL (Sagi + Or + MKP + Mike Christie) - Fix NULL pointer dereference regression related to XCOPY introduced in v3.15 + CC'ed to v3.12.y (nab)" * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (34 commits) target: Fix NULL pointer dereference for XCOPY in target_put_sess_cmd vhost-scsi: Include prot_bytes into expected data transfer length TARGET/sbc,loopback: Adjust command data length in case pi exists on the wire libiscsi, iser: Adjust data_length to include protection information scsi_cmnd: Introduce scsi_transfer_length helper target: Report correct response length for some commands target/sbc: Check that the LBA and number of blocks are correct in VERIFY target/sbc: Remove sbc_check_valid_sectors() Target/iscsi: Fix sendtargets response pdu for iser transport Target/iser: Fix a wrong dereference in case discovery session is over iser iscsi-target: Fix ABORT_TASK + connection reset iscsi_queue_req memory leak target: Use complete_all for se_cmd->t_transport_stop_comp target: Set CMD_T_ACTIVE bit for Task Management Requests target: cleanup some boolean tests target/spc: Simplify INQUIRY EVPD=0x80 tcm_fc: Generate TASK_SET_FULL status for response failures tcm_fc: Generate TASK_SET_FULL status for DataIN failures iscsi-target: Reject mutual authentication with reflected CHAP_C iscsi-target: Remove no-op from iscsit_tpg_del_portal_group iscsi-target: Fix CHAP_A parameter list handling ...
2375 lines
62 KiB
C
2375 lines
62 KiB
C
/*******************************************************************************
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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 <nab@daterainc.com>
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* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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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/miscdevice.h>
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#include <asm/unaligned.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_tcq.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 <target/target_core_fabric_configfs.h>
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#include <target/target_core_configfs.h>
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#include <target/configfs_macros.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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#include <linux/percpu_ida.h>
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#include "vhost.h"
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#define TCM_VHOST_VERSION "v0.1"
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#define TCM_VHOST_NAMELEN 256
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#define TCM_VHOST_MAX_CDB_SIZE 32
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#define TCM_VHOST_DEFAULT_TAGS 256
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#define TCM_VHOST_PREALLOC_SGLS 2048
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#define TCM_VHOST_PREALLOC_UPAGES 2048
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#define TCM_VHOST_PREALLOC_PROT_SGLS 512
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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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struct tcm_vhost_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 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 tcm_vhost_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 */
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struct virtio_scsi_cmd_resp __user *tvc_resp;
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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 tcm_vhost_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 tcm_vhost_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[TCM_VHOST_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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struct tcm_vhost_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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struct tcm_vhost_nacl {
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/* Binary World Wide unique Port Name for Vhost Initiator port */
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u64 iport_wwpn;
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/* ASCII formatted WWPN for Sas Initiator port */
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char iport_name[TCM_VHOST_NAMELEN];
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/* Returned by tcm_vhost_make_nodeacl() */
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struct se_node_acl se_node_acl;
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};
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struct tcm_vhost_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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/* list for tcm_vhost_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 tcm_vhost_nexus *tpg_nexus;
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/* Pointer back to tcm_vhost_tport */
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struct tcm_vhost_tport *tport;
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/* Returned by tcm_vhost_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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};
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struct tcm_vhost_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[TCM_VHOST_NAMELEN];
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/* Returned by tcm_vhost_make_tport() */
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struct se_wwn tport_wwn;
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};
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struct tcm_vhost_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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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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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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};
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struct vhost_scsi {
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/* Protected by vhost_scsi->dev.mutex */
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struct tcm_vhost_tpg **vs_tpg;
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char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
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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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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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/* Local pointer to allocated TCM configfs fabric module */
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static struct target_fabric_configfs *tcm_vhost_fabric_configfs;
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static struct workqueue_struct *tcm_vhost_workqueue;
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/* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */
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static DEFINE_MUTEX(tcm_vhost_mutex);
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static LIST_HEAD(tcm_vhost_list);
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static int iov_num_pages(struct iovec *iov)
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{
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return (PAGE_ALIGN((unsigned long)iov->iov_base + iov->iov_len) -
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((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT;
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}
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static void tcm_vhost_done_inflight(struct kref *kref)
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{
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struct vhost_scsi_inflight *inflight;
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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 tcm_vhost_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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/* 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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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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tcm_vhost_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 tcm_vhost_put_inflight(struct vhost_scsi_inflight *inflight)
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{
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kref_put(&inflight->kref, tcm_vhost_done_inflight);
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}
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static int tcm_vhost_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 tcm_vhost_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 *tcm_vhost_get_fabric_name(void)
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{
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return "vhost";
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}
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static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg)
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{
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struct tcm_vhost_tpg *tpg = container_of(se_tpg,
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struct tcm_vhost_tpg, se_tpg);
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struct tcm_vhost_tport *tport = tpg->tport;
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switch (tport->tport_proto_id) {
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case SCSI_PROTOCOL_SAS:
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return sas_get_fabric_proto_ident(se_tpg);
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case SCSI_PROTOCOL_FCP:
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return fc_get_fabric_proto_ident(se_tpg);
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case SCSI_PROTOCOL_ISCSI:
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return iscsi_get_fabric_proto_ident(se_tpg);
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default:
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pr_err("Unknown tport_proto_id: 0x%02x, using"
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" SAS emulation\n", tport->tport_proto_id);
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break;
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}
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return sas_get_fabric_proto_ident(se_tpg);
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}
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static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg)
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{
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struct tcm_vhost_tpg *tpg = container_of(se_tpg,
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struct tcm_vhost_tpg, se_tpg);
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struct tcm_vhost_tport *tport = tpg->tport;
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return &tport->tport_name[0];
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}
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static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg)
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{
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struct tcm_vhost_tpg *tpg = container_of(se_tpg,
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struct tcm_vhost_tpg, se_tpg);
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return tpg->tport_tpgt;
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}
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static u32 tcm_vhost_get_default_depth(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 u32
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tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg,
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struct se_node_acl *se_nacl,
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struct t10_pr_registration *pr_reg,
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int *format_code,
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unsigned char *buf)
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{
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struct tcm_vhost_tpg *tpg = container_of(se_tpg,
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struct tcm_vhost_tpg, se_tpg);
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struct tcm_vhost_tport *tport = tpg->tport;
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switch (tport->tport_proto_id) {
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case SCSI_PROTOCOL_SAS:
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return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
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format_code, buf);
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case SCSI_PROTOCOL_FCP:
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return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
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format_code, buf);
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case SCSI_PROTOCOL_ISCSI:
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return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
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format_code, buf);
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default:
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pr_err("Unknown tport_proto_id: 0x%02x, using"
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" SAS emulation\n", tport->tport_proto_id);
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break;
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}
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return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
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format_code, buf);
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}
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static u32
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tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg,
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struct se_node_acl *se_nacl,
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struct t10_pr_registration *pr_reg,
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int *format_code)
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{
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struct tcm_vhost_tpg *tpg = container_of(se_tpg,
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struct tcm_vhost_tpg, se_tpg);
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struct tcm_vhost_tport *tport = tpg->tport;
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switch (tport->tport_proto_id) {
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case SCSI_PROTOCOL_SAS:
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return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
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format_code);
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case SCSI_PROTOCOL_FCP:
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return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
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format_code);
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case SCSI_PROTOCOL_ISCSI:
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return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
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format_code);
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default:
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pr_err("Unknown tport_proto_id: 0x%02x, using"
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" SAS emulation\n", tport->tport_proto_id);
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break;
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}
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return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
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format_code);
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}
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static char *
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tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
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const char *buf,
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u32 *out_tid_len,
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char **port_nexus_ptr)
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{
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struct tcm_vhost_tpg *tpg = container_of(se_tpg,
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struct tcm_vhost_tpg, se_tpg);
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struct tcm_vhost_tport *tport = tpg->tport;
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switch (tport->tport_proto_id) {
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case SCSI_PROTOCOL_SAS:
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return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
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port_nexus_ptr);
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case SCSI_PROTOCOL_FCP:
|
|
return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
|
|
port_nexus_ptr);
|
|
case SCSI_PROTOCOL_ISCSI:
|
|
return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
|
|
port_nexus_ptr);
|
|
default:
|
|
pr_err("Unknown tport_proto_id: 0x%02x, using"
|
|
" SAS emulation\n", tport->tport_proto_id);
|
|
break;
|
|
}
|
|
|
|
return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
|
|
port_nexus_ptr);
|
|
}
|
|
|
|
static struct se_node_acl *
|
|
tcm_vhost_alloc_fabric_acl(struct se_portal_group *se_tpg)
|
|
{
|
|
struct tcm_vhost_nacl *nacl;
|
|
|
|
nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL);
|
|
if (!nacl) {
|
|
pr_err("Unable to allocate struct tcm_vhost_nacl\n");
|
|
return NULL;
|
|
}
|
|
|
|
return &nacl->se_node_acl;
|
|
}
|
|
|
|
static void
|
|
tcm_vhost_release_fabric_acl(struct se_portal_group *se_tpg,
|
|
struct se_node_acl *se_nacl)
|
|
{
|
|
struct tcm_vhost_nacl *nacl = container_of(se_nacl,
|
|
struct tcm_vhost_nacl, se_node_acl);
|
|
kfree(nacl);
|
|
}
|
|
|
|
static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static void tcm_vhost_release_cmd(struct se_cmd *se_cmd)
|
|
{
|
|
struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
|
|
struct tcm_vhost_cmd, tvc_se_cmd);
|
|
struct se_session *se_sess = se_cmd->se_sess;
|
|
int i;
|
|
|
|
if (tv_cmd->tvc_sgl_count) {
|
|
for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
|
|
put_page(sg_page(&tv_cmd->tvc_sgl[i]));
|
|
}
|
|
if (tv_cmd->tvc_prot_sgl_count) {
|
|
for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++)
|
|
put_page(sg_page(&tv_cmd->tvc_prot_sgl[i]));
|
|
}
|
|
|
|
tcm_vhost_put_inflight(tv_cmd->inflight);
|
|
percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag);
|
|
}
|
|
|
|
static int tcm_vhost_shutdown_session(struct se_session *se_sess)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void tcm_vhost_close_session(struct se_session *se_sess)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static u32 tcm_vhost_sess_get_index(struct se_session *se_sess)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int tcm_vhost_write_pending(struct se_cmd *se_cmd)
|
|
{
|
|
/* Go ahead and process the write immediately */
|
|
target_execute_cmd(se_cmd);
|
|
return 0;
|
|
}
|
|
|
|
static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *cmd)
|
|
{
|
|
struct vhost_scsi *vs = cmd->tvc_vhost;
|
|
|
|
llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list);
|
|
|
|
vhost_work_queue(&vs->dev, &vs->vs_completion_work);
|
|
}
|
|
|
|
static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd)
|
|
{
|
|
struct tcm_vhost_cmd *cmd = container_of(se_cmd,
|
|
struct tcm_vhost_cmd, tvc_se_cmd);
|
|
vhost_scsi_complete_cmd(cmd);
|
|
return 0;
|
|
}
|
|
|
|
static int tcm_vhost_queue_status(struct se_cmd *se_cmd)
|
|
{
|
|
struct tcm_vhost_cmd *cmd = container_of(se_cmd,
|
|
struct tcm_vhost_cmd, tvc_se_cmd);
|
|
vhost_scsi_complete_cmd(cmd);
|
|
return 0;
|
|
}
|
|
|
|
static void tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static void tcm_vhost_aborted_task(struct se_cmd *se_cmd)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static void tcm_vhost_free_evt(struct vhost_scsi *vs, struct tcm_vhost_evt *evt)
|
|
{
|
|
vs->vs_events_nr--;
|
|
kfree(evt);
|
|
}
|
|
|
|
static struct tcm_vhost_evt *
|
|
tcm_vhost_allocate_evt(struct vhost_scsi *vs,
|
|
u32 event, u32 reason)
|
|
{
|
|
struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
|
|
struct tcm_vhost_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 tcm_vhost_evt\n");
|
|
vs->vs_events_missed = true;
|
|
return NULL;
|
|
}
|
|
|
|
evt->event.event = event;
|
|
evt->event.reason = reason;
|
|
vs->vs_events_nr++;
|
|
|
|
return evt;
|
|
}
|
|
|
|
static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *cmd)
|
|
{
|
|
struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
|
|
|
|
/* TODO locking against target/backend threads? */
|
|
transport_generic_free_cmd(se_cmd, 0);
|
|
|
|
}
|
|
|
|
static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd)
|
|
{
|
|
return target_put_sess_cmd(se_cmd->se_sess, se_cmd);
|
|
}
|
|
|
|
static void
|
|
tcm_vhost_do_evt_work(struct vhost_scsi *vs, struct tcm_vhost_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 (!vq->private_data) {
|
|
vs->vs_events_missed = true;
|
|
return;
|
|
}
|
|
|
|
again:
|
|
vhost_disable_notify(&vs->dev, vq);
|
|
head = vhost_get_vq_desc(vq, vq->iov,
|
|
ARRAY_SIZE(vq->iov), &out, &in,
|
|
NULL, NULL);
|
|
if (head < 0) {
|
|
vs->vs_events_missed = true;
|
|
return;
|
|
}
|
|
if (head == vq->num) {
|
|
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 |= 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 tcm_vhost_send_event\n");
|
|
}
|
|
|
|
static void tcm_vhost_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 tcm_vhost_evt *evt;
|
|
struct llist_node *llnode;
|
|
|
|
mutex_lock(&vq->mutex);
|
|
llnode = llist_del_all(&vs->vs_event_list);
|
|
while (llnode) {
|
|
evt = llist_entry(llnode, struct tcm_vhost_evt, list);
|
|
llnode = llist_next(llnode);
|
|
tcm_vhost_do_evt_work(vs, evt);
|
|
tcm_vhost_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 tcm_vhost_cmd *cmd;
|
|
struct llist_node *llnode;
|
|
struct se_cmd *se_cmd;
|
|
int ret, vq;
|
|
|
|
bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
|
|
llnode = llist_del_all(&vs->vs_completion_list);
|
|
while (llnode) {
|
|
cmd = llist_entry(llnode, struct tcm_vhost_cmd,
|
|
tvc_completion_list);
|
|
llnode = llist_next(llnode);
|
|
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 = se_cmd->residual_count;
|
|
/* TODO is status_qualifier field needed? */
|
|
v_rsp.status = se_cmd->scsi_status;
|
|
v_rsp.sense_len = se_cmd->scsi_sense_length;
|
|
memcpy(v_rsp.sense, cmd->tvc_sense_buf,
|
|
v_rsp.sense_len);
|
|
ret = copy_to_user(cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
|
|
if (likely(ret == 0)) {
|
|
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_free_cmd(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 tcm_vhost_cmd *
|
|
vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct tcm_vhost_tpg *tpg,
|
|
unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
|
|
u32 exp_data_len, int data_direction)
|
|
{
|
|
struct tcm_vhost_cmd *cmd;
|
|
struct tcm_vhost_nexus *tv_nexus;
|
|
struct se_session *se_sess;
|
|
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 tcm_vhost_nexus\n");
|
|
return ERR_PTR(-EIO);
|
|
}
|
|
se_sess = tv_nexus->tvn_se_sess;
|
|
|
|
tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING);
|
|
if (tag < 0) {
|
|
pr_err("Unable to obtain tag for tcm_vhost_cmd\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[tag];
|
|
sg = cmd->tvc_sgl;
|
|
prot_sg = cmd->tvc_prot_sgl;
|
|
pages = cmd->tvc_upages;
|
|
memset(cmd, 0, sizeof(struct tcm_vhost_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 = tcm_vhost_get_inflight(vq);
|
|
|
|
memcpy(cmd->tvc_cdb, cdb, TCM_VHOST_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 tcm_vhost_cmd *tv_cmd,
|
|
struct scatterlist *sgl,
|
|
unsigned int sgl_count,
|
|
struct iovec *iov,
|
|
struct page **pages,
|
|
bool write)
|
|
{
|
|
unsigned int npages = 0, pages_nr, offset, nbytes;
|
|
struct scatterlist *sg = sgl;
|
|
void __user *ptr = iov->iov_base;
|
|
size_t len = iov->iov_len;
|
|
int ret, i;
|
|
|
|
pages_nr = iov_num_pages(iov);
|
|
if (pages_nr > sgl_count) {
|
|
pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
|
|
" sgl_count: %u\n", pages_nr, sgl_count);
|
|
return -ENOBUFS;
|
|
}
|
|
if (pages_nr > TCM_VHOST_PREALLOC_UPAGES) {
|
|
pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
|
|
" preallocated TCM_VHOST_PREALLOC_UPAGES: %u\n",
|
|
pages_nr, TCM_VHOST_PREALLOC_UPAGES);
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
|
|
/* No pages were pinned */
|
|
if (ret < 0)
|
|
goto out;
|
|
/* Less pages pinned than wanted */
|
|
if (ret != pages_nr) {
|
|
for (i = 0; i < ret; i++)
|
|
put_page(pages[i]);
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
while (len > 0) {
|
|
offset = (uintptr_t)ptr & ~PAGE_MASK;
|
|
nbytes = min_t(unsigned int, PAGE_SIZE - offset, len);
|
|
sg_set_page(sg, pages[npages], nbytes, offset);
|
|
ptr += nbytes;
|
|
len -= nbytes;
|
|
sg++;
|
|
npages++;
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *cmd,
|
|
struct iovec *iov,
|
|
int niov,
|
|
bool write)
|
|
{
|
|
struct scatterlist *sg = cmd->tvc_sgl;
|
|
unsigned int sgl_count = 0;
|
|
int ret, i;
|
|
|
|
for (i = 0; i < niov; i++)
|
|
sgl_count += iov_num_pages(&iov[i]);
|
|
|
|
if (sgl_count > TCM_VHOST_PREALLOC_SGLS) {
|
|
pr_err("vhost_scsi_map_iov_to_sgl() sgl_count: %u greater than"
|
|
" preallocated TCM_VHOST_PREALLOC_SGLS: %u\n",
|
|
sgl_count, TCM_VHOST_PREALLOC_SGLS);
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
pr_debug("%s sg %p sgl_count %u\n", __func__, sg, sgl_count);
|
|
sg_init_table(sg, sgl_count);
|
|
cmd->tvc_sgl_count = sgl_count;
|
|
|
|
pr_debug("Mapping iovec %p for %u pages\n", &iov[0], sgl_count);
|
|
|
|
for (i = 0; i < niov; i++) {
|
|
ret = vhost_scsi_map_to_sgl(cmd, sg, sgl_count, &iov[i],
|
|
cmd->tvc_upages, write);
|
|
if (ret < 0) {
|
|
for (i = 0; i < cmd->tvc_sgl_count; i++)
|
|
put_page(sg_page(&cmd->tvc_sgl[i]));
|
|
|
|
cmd->tvc_sgl_count = 0;
|
|
return ret;
|
|
}
|
|
sg += ret;
|
|
sgl_count -= ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
vhost_scsi_map_iov_to_prot(struct tcm_vhost_cmd *cmd,
|
|
struct iovec *iov,
|
|
int niov,
|
|
bool write)
|
|
{
|
|
struct scatterlist *prot_sg = cmd->tvc_prot_sgl;
|
|
unsigned int prot_sgl_count = 0;
|
|
int ret, i;
|
|
|
|
for (i = 0; i < niov; i++)
|
|
prot_sgl_count += iov_num_pages(&iov[i]);
|
|
|
|
if (prot_sgl_count > TCM_VHOST_PREALLOC_PROT_SGLS) {
|
|
pr_err("vhost_scsi_map_iov_to_prot() sgl_count: %u greater than"
|
|
" preallocated TCM_VHOST_PREALLOC_PROT_SGLS: %u\n",
|
|
prot_sgl_count, TCM_VHOST_PREALLOC_PROT_SGLS);
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__,
|
|
prot_sg, prot_sgl_count);
|
|
sg_init_table(prot_sg, prot_sgl_count);
|
|
cmd->tvc_prot_sgl_count = prot_sgl_count;
|
|
|
|
for (i = 0; i < niov; i++) {
|
|
ret = vhost_scsi_map_to_sgl(cmd, prot_sg, prot_sgl_count, &iov[i],
|
|
cmd->tvc_upages, write);
|
|
if (ret < 0) {
|
|
for (i = 0; i < cmd->tvc_prot_sgl_count; i++)
|
|
put_page(sg_page(&cmd->tvc_prot_sgl[i]));
|
|
|
|
cmd->tvc_prot_sgl_count = 0;
|
|
return ret;
|
|
}
|
|
prot_sg += ret;
|
|
prot_sgl_count -= ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void tcm_vhost_submission_work(struct work_struct *work)
|
|
{
|
|
struct tcm_vhost_cmd *cmd =
|
|
container_of(work, struct tcm_vhost_cmd, work);
|
|
struct tcm_vhost_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;
|
|
|
|
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,
|
|
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 void
|
|
vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
|
|
{
|
|
struct tcm_vhost_tpg **vs_tpg;
|
|
struct virtio_scsi_cmd_req v_req;
|
|
struct virtio_scsi_cmd_req_pi v_req_pi;
|
|
struct tcm_vhost_tpg *tpg;
|
|
struct tcm_vhost_cmd *cmd;
|
|
u64 tag;
|
|
u32 exp_data_len, data_first, data_num, data_direction, prot_first;
|
|
unsigned out, in, i;
|
|
int head, ret, data_niov, prot_niov, prot_bytes;
|
|
size_t req_size;
|
|
u16 lun;
|
|
u8 *target, *lunp, task_attr;
|
|
bool hdr_pi;
|
|
void *req, *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 = vq->private_data;
|
|
if (!vs_tpg)
|
|
goto out;
|
|
|
|
vhost_disable_notify(&vs->dev, vq);
|
|
|
|
for (;;) {
|
|
head = vhost_get_vq_desc(vq, vq->iov,
|
|
ARRAY_SIZE(vq->iov), &out, &in,
|
|
NULL, NULL);
|
|
pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
|
|
head, out, in);
|
|
/* On error, stop handling until the next kick. */
|
|
if (unlikely(head < 0))
|
|
break;
|
|
/* Nothing new? Wait for eventfd to tell us they refilled. */
|
|
if (head == vq->num) {
|
|
if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
|
|
vhost_disable_notify(&vs->dev, vq);
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* FIXME: BIDI operation */
|
|
if (out == 1 && in == 1) {
|
|
data_direction = DMA_NONE;
|
|
data_first = 0;
|
|
data_num = 0;
|
|
} else if (out == 1 && in > 1) {
|
|
data_direction = DMA_FROM_DEVICE;
|
|
data_first = out + 1;
|
|
data_num = in - 1;
|
|
} else if (out > 1 && in == 1) {
|
|
data_direction = DMA_TO_DEVICE;
|
|
data_first = 1;
|
|
data_num = out - 1;
|
|
} else {
|
|
vq_err(vq, "Invalid buffer layout out: %u in: %u\n",
|
|
out, in);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Check for a sane resp buffer so we can report errors to
|
|
* the guest.
|
|
*/
|
|
if (unlikely(vq->iov[out].iov_len !=
|
|
sizeof(struct virtio_scsi_cmd_resp))) {
|
|
vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
|
|
" bytes\n", vq->iov[out].iov_len);
|
|
break;
|
|
}
|
|
|
|
if (vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI)) {
|
|
req = &v_req_pi;
|
|
lunp = &v_req_pi.lun[0];
|
|
target = &v_req_pi.lun[1];
|
|
req_size = sizeof(v_req_pi);
|
|
hdr_pi = true;
|
|
} else {
|
|
req = &v_req;
|
|
lunp = &v_req.lun[0];
|
|
target = &v_req.lun[1];
|
|
req_size = sizeof(v_req);
|
|
hdr_pi = false;
|
|
}
|
|
|
|
if (unlikely(vq->iov[0].iov_len < req_size)) {
|
|
pr_err("Expecting virtio-scsi header: %zu, got %zu\n",
|
|
req_size, vq->iov[0].iov_len);
|
|
break;
|
|
}
|
|
ret = memcpy_fromiovecend(req, &vq->iov[0], 0, req_size);
|
|
if (unlikely(ret)) {
|
|
vq_err(vq, "Faulted on virtio_scsi_cmd_req\n");
|
|
break;
|
|
}
|
|
|
|
/* virtio-scsi spec requires byte 0 of the lun to be 1 */
|
|
if (unlikely(*lunp != 1)) {
|
|
vhost_scsi_send_bad_target(vs, vq, head, out);
|
|
continue;
|
|
}
|
|
|
|
tpg = ACCESS_ONCE(vs_tpg[*target]);
|
|
|
|
/* Target does not exist, fail the request */
|
|
if (unlikely(!tpg)) {
|
|
vhost_scsi_send_bad_target(vs, vq, head, out);
|
|
continue;
|
|
}
|
|
|
|
data_niov = data_num;
|
|
prot_niov = prot_first = prot_bytes = 0;
|
|
/*
|
|
* Determine if any protection information iovecs are preceeding
|
|
* the actual data payload, and adjust data_first + data_niov
|
|
* values accordingly for vhost_scsi_map_iov_to_sgl() below.
|
|
*
|
|
* Also extract virtio_scsi header bits for vhost_scsi_get_tag()
|
|
*/
|
|
if (hdr_pi) {
|
|
if (v_req_pi.pi_bytesout) {
|
|
if (data_direction != DMA_TO_DEVICE) {
|
|
vq_err(vq, "Received non zero do_pi_niov"
|
|
", but wrong data_direction\n");
|
|
goto err_cmd;
|
|
}
|
|
prot_bytes = v_req_pi.pi_bytesout;
|
|
} else if (v_req_pi.pi_bytesin) {
|
|
if (data_direction != DMA_FROM_DEVICE) {
|
|
vq_err(vq, "Received non zero di_pi_niov"
|
|
", but wrong data_direction\n");
|
|
goto err_cmd;
|
|
}
|
|
prot_bytes = v_req_pi.pi_bytesin;
|
|
}
|
|
if (prot_bytes) {
|
|
int tmp = 0;
|
|
|
|
for (i = 0; i < data_num; i++) {
|
|
tmp += vq->iov[data_first + i].iov_len;
|
|
prot_niov++;
|
|
if (tmp >= prot_bytes)
|
|
break;
|
|
}
|
|
prot_first = data_first;
|
|
data_first += prot_niov;
|
|
data_niov = data_num - prot_niov;
|
|
}
|
|
tag = v_req_pi.tag;
|
|
task_attr = v_req_pi.task_attr;
|
|
cdb = &v_req_pi.cdb[0];
|
|
lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF;
|
|
} else {
|
|
tag = v_req.tag;
|
|
task_attr = v_req.task_attr;
|
|
cdb = &v_req.cdb[0];
|
|
lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
|
|
}
|
|
exp_data_len = 0;
|
|
for (i = 0; i < data_niov; i++)
|
|
exp_data_len += vq->iov[data_first + i].iov_len;
|
|
/*
|
|
* Check that the recieved CDB size does not exceeded our
|
|
* hardcoded max for vhost-scsi
|
|
*
|
|
* TODO what if cdb was too small for varlen cdb header?
|
|
*/
|
|
if (unlikely(scsi_command_size(cdb) > TCM_VHOST_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), TCM_VHOST_MAX_CDB_SIZE);
|
|
goto err_cmd;
|
|
}
|
|
|
|
cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr,
|
|
exp_data_len + prot_bytes,
|
|
data_direction);
|
|
if (IS_ERR(cmd)) {
|
|
vq_err(vq, "vhost_scsi_get_tag failed %ld\n",
|
|
PTR_ERR(cmd));
|
|
goto err_cmd;
|
|
}
|
|
|
|
pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
|
|
": %d\n", cmd, exp_data_len, data_direction);
|
|
|
|
cmd->tvc_vhost = vs;
|
|
cmd->tvc_vq = vq;
|
|
cmd->tvc_resp = vq->iov[out].iov_base;
|
|
|
|
pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
|
|
cmd->tvc_cdb[0], cmd->tvc_lun);
|
|
|
|
if (prot_niov) {
|
|
ret = vhost_scsi_map_iov_to_prot(cmd,
|
|
&vq->iov[prot_first], prot_niov,
|
|
data_direction == DMA_FROM_DEVICE);
|
|
if (unlikely(ret)) {
|
|
vq_err(vq, "Failed to map iov to"
|
|
" prot_sgl\n");
|
|
goto err_free;
|
|
}
|
|
}
|
|
if (data_direction != DMA_NONE) {
|
|
ret = vhost_scsi_map_iov_to_sgl(cmd,
|
|
&vq->iov[data_first], data_niov,
|
|
data_direction == DMA_FROM_DEVICE);
|
|
if (unlikely(ret)) {
|
|
vq_err(vq, "Failed to map iov to sgl\n");
|
|
goto err_free;
|
|
}
|
|
}
|
|
/*
|
|
* Save the descriptor from vhost_get_vq_desc() to be used to
|
|
* complete the virtio-scsi request in TCM callback context via
|
|
* tcm_vhost_queue_data_in() and tcm_vhost_queue_status()
|
|
*/
|
|
cmd->tvc_vq_desc = head;
|
|
/*
|
|
* Dispatch tv_cmd descriptor for cmwq execution in process
|
|
* context provided by tcm_vhost_workqueue. This also ensures
|
|
* tv_cmd is executed on the same kworker CPU as this vhost
|
|
* thread to gain positive L2 cache locality effects..
|
|
*/
|
|
INIT_WORK(&cmd->work, tcm_vhost_submission_work);
|
|
queue_work(tcm_vhost_workqueue, &cmd->work);
|
|
}
|
|
|
|
mutex_unlock(&vq->mutex);
|
|
return;
|
|
|
|
err_free:
|
|
vhost_scsi_free_cmd(cmd);
|
|
err_cmd:
|
|
vhost_scsi_send_bad_target(vs, vq, head, out);
|
|
out:
|
|
mutex_unlock(&vq->mutex);
|
|
}
|
|
|
|
static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
|
|
{
|
|
pr_debug("%s: The handling func for control queue.\n", __func__);
|
|
}
|
|
|
|
static void
|
|
tcm_vhost_send_evt(struct vhost_scsi *vs,
|
|
struct tcm_vhost_tpg *tpg,
|
|
struct se_lun *lun,
|
|
u32 event,
|
|
u32 reason)
|
|
{
|
|
struct tcm_vhost_evt *evt;
|
|
|
|
evt = tcm_vhost_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 & 0xFF;
|
|
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 (!vq->private_data)
|
|
goto out;
|
|
|
|
if (vs->vs_events_missed)
|
|
tcm_vhost_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 */
|
|
tcm_vhost_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, tcm_vhost_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);
|
|
}
|
|
|
|
/*
|
|
* Called from vhost_scsi_ioctl() context to walk the list of available
|
|
* tcm_vhost_tpg with an active struct tcm_vhost_nexus
|
|
*
|
|
* The lock nesting rule is:
|
|
* tcm_vhost_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 tcm_vhost_tport *tv_tport;
|
|
struct tcm_vhost_tpg *tpg;
|
|
struct tcm_vhost_tpg **vs_tpg;
|
|
struct vhost_virtqueue *vq;
|
|
int index, ret, i, len;
|
|
bool match = false;
|
|
|
|
mutex_lock(&tcm_vhost_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, &tcm_vhost_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]) {
|
|
kfree(vs_tpg);
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
tpg->tv_tpg_vhost_count++;
|
|
tpg->vhost_scsi = vs;
|
|
vs_tpg[tpg->tport_tpgt] = tpg;
|
|
smp_mb__after_atomic();
|
|
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 = 0; i < VHOST_SCSI_MAX_VQ; i++) {
|
|
vq = &vs->vqs[i].vq;
|
|
mutex_lock(&vq->mutex);
|
|
vq->private_data = vs_tpg;
|
|
vhost_init_used(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;
|
|
|
|
out:
|
|
mutex_unlock(&vs->dev.mutex);
|
|
mutex_unlock(&tcm_vhost_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
|
|
struct vhost_scsi_target *t)
|
|
{
|
|
struct tcm_vhost_tport *tv_tport;
|
|
struct tcm_vhost_tpg *tpg;
|
|
struct vhost_virtqueue *vq;
|
|
bool match = false;
|
|
int index, ret, i;
|
|
u8 target;
|
|
|
|
mutex_lock(&tcm_vhost_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);
|
|
}
|
|
if (match) {
|
|
for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
|
|
vq = &vs->vqs[i].vq;
|
|
mutex_lock(&vq->mutex);
|
|
vq->private_data = NULL;
|
|
mutex_unlock(&vq->mutex);
|
|
}
|
|
}
|
|
/*
|
|
* 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(&tcm_vhost_mutex);
|
|
return 0;
|
|
|
|
err_tpg:
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
err_dev:
|
|
mutex_unlock(&vs->dev.mutex);
|
|
mutex_unlock(&tcm_vhost_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 void vhost_scsi_free(struct vhost_scsi *vs)
|
|
{
|
|
if (is_vmalloc_addr(vs))
|
|
vfree(vs);
|
|
else
|
|
kfree(vs);
|
|
}
|
|
|
|
static int vhost_scsi_open(struct inode *inode, struct file *f)
|
|
{
|
|
struct vhost_scsi *vs;
|
|
struct vhost_virtqueue **vqs;
|
|
int r = -ENOMEM, i;
|
|
|
|
vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
|
|
if (!vs) {
|
|
vs = vzalloc(sizeof(*vs));
|
|
if (!vs)
|
|
goto err_vs;
|
|
}
|
|
|
|
vqs = kmalloc(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, tcm_vhost_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);
|
|
|
|
tcm_vhost_init_inflight(vs, NULL);
|
|
|
|
f->private_data = vs;
|
|
return 0;
|
|
|
|
err_vqs:
|
|
vhost_scsi_free(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, false);
|
|
/* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
|
|
vhost_scsi_flush(vs);
|
|
kfree(vs->dev.vqs);
|
|
vhost_scsi_free(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;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
|
|
unsigned long arg)
|
|
{
|
|
return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
|
|
}
|
|
#endif
|
|
|
|
static const struct file_operations vhost_scsi_fops = {
|
|
.owner = THIS_MODULE,
|
|
.release = vhost_scsi_release,
|
|
.unlocked_ioctl = vhost_scsi_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = vhost_scsi_compat_ioctl,
|
|
#endif
|
|
.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 int vhost_scsi_deregister(void)
|
|
{
|
|
return misc_deregister(&vhost_scsi_misc);
|
|
}
|
|
|
|
static char *tcm_vhost_dump_proto_id(struct tcm_vhost_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
|
|
tcm_vhost_do_plug(struct tcm_vhost_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))
|
|
tcm_vhost_send_evt(vs, tpg, lun,
|
|
VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
|
|
mutex_unlock(&vq->mutex);
|
|
mutex_unlock(&vs->dev.mutex);
|
|
}
|
|
|
|
static void tcm_vhost_hotplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun)
|
|
{
|
|
tcm_vhost_do_plug(tpg, lun, true);
|
|
}
|
|
|
|
static void tcm_vhost_hotunplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun)
|
|
{
|
|
tcm_vhost_do_plug(tpg, lun, false);
|
|
}
|
|
|
|
static int tcm_vhost_port_link(struct se_portal_group *se_tpg,
|
|
struct se_lun *lun)
|
|
{
|
|
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
|
|
struct tcm_vhost_tpg, se_tpg);
|
|
|
|
mutex_lock(&tcm_vhost_mutex);
|
|
|
|
mutex_lock(&tpg->tv_tpg_mutex);
|
|
tpg->tv_tpg_port_count++;
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
|
|
tcm_vhost_hotplug(tpg, lun);
|
|
|
|
mutex_unlock(&tcm_vhost_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg,
|
|
struct se_lun *lun)
|
|
{
|
|
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
|
|
struct tcm_vhost_tpg, se_tpg);
|
|
|
|
mutex_lock(&tcm_vhost_mutex);
|
|
|
|
mutex_lock(&tpg->tv_tpg_mutex);
|
|
tpg->tv_tpg_port_count--;
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
|
|
tcm_vhost_hotunplug(tpg, lun);
|
|
|
|
mutex_unlock(&tcm_vhost_mutex);
|
|
}
|
|
|
|
static struct se_node_acl *
|
|
tcm_vhost_make_nodeacl(struct se_portal_group *se_tpg,
|
|
struct config_group *group,
|
|
const char *name)
|
|
{
|
|
struct se_node_acl *se_nacl, *se_nacl_new;
|
|
struct tcm_vhost_nacl *nacl;
|
|
u64 wwpn = 0;
|
|
u32 nexus_depth;
|
|
|
|
/* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
|
|
return ERR_PTR(-EINVAL); */
|
|
se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg);
|
|
if (!se_nacl_new)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
nexus_depth = 1;
|
|
/*
|
|
* se_nacl_new may be released by core_tpg_add_initiator_node_acl()
|
|
* when converting a NodeACL from demo mode -> explict
|
|
*/
|
|
se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
|
|
name, nexus_depth);
|
|
if (IS_ERR(se_nacl)) {
|
|
tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new);
|
|
return se_nacl;
|
|
}
|
|
/*
|
|
* Locate our struct tcm_vhost_nacl and set the FC Nport WWPN
|
|
*/
|
|
nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl);
|
|
nacl->iport_wwpn = wwpn;
|
|
|
|
return se_nacl;
|
|
}
|
|
|
|
static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl)
|
|
{
|
|
struct tcm_vhost_nacl *nacl = container_of(se_acl,
|
|
struct tcm_vhost_nacl, se_node_acl);
|
|
core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
|
|
kfree(nacl);
|
|
}
|
|
|
|
static void tcm_vhost_free_cmd_map_res(struct tcm_vhost_nexus *nexus,
|
|
struct se_session *se_sess)
|
|
{
|
|
struct tcm_vhost_cmd *tv_cmd;
|
|
unsigned int i;
|
|
|
|
if (!se_sess->sess_cmd_map)
|
|
return;
|
|
|
|
for (i = 0; i < TCM_VHOST_DEFAULT_TAGS; i++) {
|
|
tv_cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[i];
|
|
|
|
kfree(tv_cmd->tvc_sgl);
|
|
kfree(tv_cmd->tvc_prot_sgl);
|
|
kfree(tv_cmd->tvc_upages);
|
|
}
|
|
}
|
|
|
|
static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tpg,
|
|
const char *name)
|
|
{
|
|
struct se_portal_group *se_tpg;
|
|
struct se_session *se_sess;
|
|
struct tcm_vhost_nexus *tv_nexus;
|
|
struct tcm_vhost_cmd *tv_cmd;
|
|
unsigned int i;
|
|
|
|
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;
|
|
}
|
|
se_tpg = &tpg->se_tpg;
|
|
|
|
tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL);
|
|
if (!tv_nexus) {
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
pr_err("Unable to allocate struct tcm_vhost_nexus\n");
|
|
return -ENOMEM;
|
|
}
|
|
/*
|
|
* Initialize the struct se_session pointer and setup tagpool
|
|
* for struct tcm_vhost_cmd descriptors
|
|
*/
|
|
tv_nexus->tvn_se_sess = transport_init_session_tags(
|
|
TCM_VHOST_DEFAULT_TAGS,
|
|
sizeof(struct tcm_vhost_cmd),
|
|
TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS);
|
|
if (IS_ERR(tv_nexus->tvn_se_sess)) {
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
kfree(tv_nexus);
|
|
return -ENOMEM;
|
|
}
|
|
se_sess = tv_nexus->tvn_se_sess;
|
|
for (i = 0; i < TCM_VHOST_DEFAULT_TAGS; i++) {
|
|
tv_cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[i];
|
|
|
|
tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) *
|
|
TCM_VHOST_PREALLOC_SGLS, GFP_KERNEL);
|
|
if (!tv_cmd->tvc_sgl) {
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
|
|
goto out;
|
|
}
|
|
|
|
tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) *
|
|
TCM_VHOST_PREALLOC_UPAGES, GFP_KERNEL);
|
|
if (!tv_cmd->tvc_upages) {
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
pr_err("Unable to allocate tv_cmd->tvc_upages\n");
|
|
goto out;
|
|
}
|
|
|
|
tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) *
|
|
TCM_VHOST_PREALLOC_PROT_SGLS, GFP_KERNEL);
|
|
if (!tv_cmd->tvc_prot_sgl) {
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
|
|
goto out;
|
|
}
|
|
}
|
|
/*
|
|
* Since we are running in 'demo mode' this call with generate a
|
|
* struct se_node_acl for the tcm_vhost struct se_portal_group with
|
|
* the SCSI Initiator port name of the passed configfs group 'name'.
|
|
*/
|
|
tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
|
|
se_tpg, (unsigned char *)name);
|
|
if (!tv_nexus->tvn_se_sess->se_node_acl) {
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
pr_debug("core_tpg_check_initiator_node_acl() failed"
|
|
" for %s\n", name);
|
|
goto out;
|
|
}
|
|
/*
|
|
* Now register the TCM vhost virtual I_T Nexus as active with the
|
|
* call to __transport_register_session()
|
|
*/
|
|
__transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
|
|
tv_nexus->tvn_se_sess, tv_nexus);
|
|
tpg->tpg_nexus = tv_nexus;
|
|
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
return 0;
|
|
|
|
out:
|
|
tcm_vhost_free_cmd_map_res(tv_nexus, se_sess);
|
|
transport_free_session(se_sess);
|
|
kfree(tv_nexus);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int tcm_vhost_drop_nexus(struct tcm_vhost_tpg *tpg)
|
|
{
|
|
struct se_session *se_sess;
|
|
struct tcm_vhost_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", tcm_vhost_dump_proto_id(tpg->tport),
|
|
tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
|
|
|
|
tcm_vhost_free_cmd_map_res(tv_nexus, se_sess);
|
|
/*
|
|
* Release the SCSI I_T Nexus to the emulated vhost Target Port
|
|
*/
|
|
transport_deregister_session(tv_nexus->tvn_se_sess);
|
|
tpg->tpg_nexus = NULL;
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
|
|
kfree(tv_nexus);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t tcm_vhost_tpg_show_nexus(struct se_portal_group *se_tpg,
|
|
char *page)
|
|
{
|
|
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
|
|
struct tcm_vhost_tpg, se_tpg);
|
|
struct tcm_vhost_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 tcm_vhost_tpg_store_nexus(struct se_portal_group *se_tpg,
|
|
const char *page,
|
|
size_t count)
|
|
{
|
|
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
|
|
struct tcm_vhost_tpg, se_tpg);
|
|
struct tcm_vhost_tport *tport_wwn = tpg->tport;
|
|
unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr;
|
|
int ret;
|
|
/*
|
|
* Shutdown the active I_T nexus if 'NULL' is passed..
|
|
*/
|
|
if (!strncmp(page, "NULL", 4)) {
|
|
ret = tcm_vhost_drop_nexus(tpg);
|
|
return (!ret) ? count : ret;
|
|
}
|
|
/*
|
|
* Otherwise make sure the passed virtual Initiator port WWN matches
|
|
* the fabric protocol_id set in tcm_vhost_make_tport(), and call
|
|
* tcm_vhost_make_nexus().
|
|
*/
|
|
if (strlen(page) >= TCM_VHOST_NAMELEN) {
|
|
pr_err("Emulated NAA Sas Address: %s, exceeds"
|
|
" max: %d\n", page, TCM_VHOST_NAMELEN);
|
|
return -EINVAL;
|
|
}
|
|
snprintf(&i_port[0], TCM_VHOST_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,
|
|
tcm_vhost_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,
|
|
tcm_vhost_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,
|
|
tcm_vhost_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 = tcm_vhost_make_nexus(tpg, port_ptr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return count;
|
|
}
|
|
|
|
TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR);
|
|
|
|
static struct configfs_attribute *tcm_vhost_tpg_attrs[] = {
|
|
&tcm_vhost_tpg_nexus.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct se_portal_group *
|
|
tcm_vhost_make_tpg(struct se_wwn *wwn,
|
|
struct config_group *group,
|
|
const char *name)
|
|
{
|
|
struct tcm_vhost_tport *tport = container_of(wwn,
|
|
struct tcm_vhost_tport, tport_wwn);
|
|
|
|
struct tcm_vhost_tpg *tpg;
|
|
unsigned long tpgt;
|
|
int ret;
|
|
|
|
if (strstr(name, "tpgt_") != name)
|
|
return ERR_PTR(-EINVAL);
|
|
if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL);
|
|
if (!tpg) {
|
|
pr_err("Unable to allocate struct tcm_vhost_tpg");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
mutex_init(&tpg->tv_tpg_mutex);
|
|
INIT_LIST_HEAD(&tpg->tv_tpg_list);
|
|
tpg->tport = tport;
|
|
tpg->tport_tpgt = tpgt;
|
|
|
|
ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn,
|
|
&tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
|
|
if (ret < 0) {
|
|
kfree(tpg);
|
|
return NULL;
|
|
}
|
|
mutex_lock(&tcm_vhost_mutex);
|
|
list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list);
|
|
mutex_unlock(&tcm_vhost_mutex);
|
|
|
|
return &tpg->se_tpg;
|
|
}
|
|
|
|
static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg)
|
|
{
|
|
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
|
|
struct tcm_vhost_tpg, se_tpg);
|
|
|
|
mutex_lock(&tcm_vhost_mutex);
|
|
list_del(&tpg->tv_tpg_list);
|
|
mutex_unlock(&tcm_vhost_mutex);
|
|
/*
|
|
* Release the virtual I_T Nexus for this vhost TPG
|
|
*/
|
|
tcm_vhost_drop_nexus(tpg);
|
|
/*
|
|
* Deregister the se_tpg from TCM..
|
|
*/
|
|
core_tpg_deregister(se_tpg);
|
|
kfree(tpg);
|
|
}
|
|
|
|
static struct se_wwn *
|
|
tcm_vhost_make_tport(struct target_fabric_configfs *tf,
|
|
struct config_group *group,
|
|
const char *name)
|
|
{
|
|
struct tcm_vhost_tport *tport;
|
|
char *ptr;
|
|
u64 wwpn = 0;
|
|
int off = 0;
|
|
|
|
/* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
|
|
return ERR_PTR(-EINVAL); */
|
|
|
|
tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL);
|
|
if (!tport) {
|
|
pr_err("Unable to allocate struct tcm_vhost_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) >= TCM_VHOST_NAMELEN) {
|
|
pr_err("Emulated %s Address: %s, exceeds"
|
|
" max: %d\n", name, tcm_vhost_dump_proto_id(tport),
|
|
TCM_VHOST_NAMELEN);
|
|
kfree(tport);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]);
|
|
|
|
pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
|
|
" %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name);
|
|
|
|
return &tport->tport_wwn;
|
|
}
|
|
|
|
static void tcm_vhost_drop_tport(struct se_wwn *wwn)
|
|
{
|
|
struct tcm_vhost_tport *tport = container_of(wwn,
|
|
struct tcm_vhost_tport, tport_wwn);
|
|
|
|
pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
|
|
" %s Address: %s\n", tcm_vhost_dump_proto_id(tport),
|
|
tport->tport_name);
|
|
|
|
kfree(tport);
|
|
}
|
|
|
|
static ssize_t
|
|
tcm_vhost_wwn_show_attr_version(struct target_fabric_configfs *tf,
|
|
char *page)
|
|
{
|
|
return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
|
|
"on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
|
|
utsname()->machine);
|
|
}
|
|
|
|
TF_WWN_ATTR_RO(tcm_vhost, version);
|
|
|
|
static struct configfs_attribute *tcm_vhost_wwn_attrs[] = {
|
|
&tcm_vhost_wwn_version.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct target_core_fabric_ops tcm_vhost_ops = {
|
|
.get_fabric_name = tcm_vhost_get_fabric_name,
|
|
.get_fabric_proto_ident = tcm_vhost_get_fabric_proto_ident,
|
|
.tpg_get_wwn = tcm_vhost_get_fabric_wwn,
|
|
.tpg_get_tag = tcm_vhost_get_tag,
|
|
.tpg_get_default_depth = tcm_vhost_get_default_depth,
|
|
.tpg_get_pr_transport_id = tcm_vhost_get_pr_transport_id,
|
|
.tpg_get_pr_transport_id_len = tcm_vhost_get_pr_transport_id_len,
|
|
.tpg_parse_pr_out_transport_id = tcm_vhost_parse_pr_out_transport_id,
|
|
.tpg_check_demo_mode = tcm_vhost_check_true,
|
|
.tpg_check_demo_mode_cache = tcm_vhost_check_true,
|
|
.tpg_check_demo_mode_write_protect = tcm_vhost_check_false,
|
|
.tpg_check_prod_mode_write_protect = tcm_vhost_check_false,
|
|
.tpg_alloc_fabric_acl = tcm_vhost_alloc_fabric_acl,
|
|
.tpg_release_fabric_acl = tcm_vhost_release_fabric_acl,
|
|
.tpg_get_inst_index = tcm_vhost_tpg_get_inst_index,
|
|
.release_cmd = tcm_vhost_release_cmd,
|
|
.check_stop_free = vhost_scsi_check_stop_free,
|
|
.shutdown_session = tcm_vhost_shutdown_session,
|
|
.close_session = tcm_vhost_close_session,
|
|
.sess_get_index = tcm_vhost_sess_get_index,
|
|
.sess_get_initiator_sid = NULL,
|
|
.write_pending = tcm_vhost_write_pending,
|
|
.write_pending_status = tcm_vhost_write_pending_status,
|
|
.set_default_node_attributes = tcm_vhost_set_default_node_attrs,
|
|
.get_task_tag = tcm_vhost_get_task_tag,
|
|
.get_cmd_state = tcm_vhost_get_cmd_state,
|
|
.queue_data_in = tcm_vhost_queue_data_in,
|
|
.queue_status = tcm_vhost_queue_status,
|
|
.queue_tm_rsp = tcm_vhost_queue_tm_rsp,
|
|
.aborted_task = tcm_vhost_aborted_task,
|
|
/*
|
|
* Setup callers for generic logic in target_core_fabric_configfs.c
|
|
*/
|
|
.fabric_make_wwn = tcm_vhost_make_tport,
|
|
.fabric_drop_wwn = tcm_vhost_drop_tport,
|
|
.fabric_make_tpg = tcm_vhost_make_tpg,
|
|
.fabric_drop_tpg = tcm_vhost_drop_tpg,
|
|
.fabric_post_link = tcm_vhost_port_link,
|
|
.fabric_pre_unlink = tcm_vhost_port_unlink,
|
|
.fabric_make_np = NULL,
|
|
.fabric_drop_np = NULL,
|
|
.fabric_make_nodeacl = tcm_vhost_make_nodeacl,
|
|
.fabric_drop_nodeacl = tcm_vhost_drop_nodeacl,
|
|
};
|
|
|
|
static int tcm_vhost_register_configfs(void)
|
|
{
|
|
struct target_fabric_configfs *fabric;
|
|
int ret;
|
|
|
|
pr_debug("TCM_VHOST fabric module %s on %s/%s"
|
|
" on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
|
|
utsname()->machine);
|
|
/*
|
|
* Register the top level struct config_item_type with TCM core
|
|
*/
|
|
fabric = target_fabric_configfs_init(THIS_MODULE, "vhost");
|
|
if (IS_ERR(fabric)) {
|
|
pr_err("target_fabric_configfs_init() failed\n");
|
|
return PTR_ERR(fabric);
|
|
}
|
|
/*
|
|
* Setup fabric->tf_ops from our local tcm_vhost_ops
|
|
*/
|
|
fabric->tf_ops = tcm_vhost_ops;
|
|
/*
|
|
* Setup default attribute lists for various fabric->tf_cit_tmpl
|
|
*/
|
|
fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs;
|
|
fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs;
|
|
fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
|
|
fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL;
|
|
fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
|
|
fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL;
|
|
fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
|
|
fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
|
|
fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL;
|
|
/*
|
|
* Register the fabric for use within TCM
|
|
*/
|
|
ret = target_fabric_configfs_register(fabric);
|
|
if (ret < 0) {
|
|
pr_err("target_fabric_configfs_register() failed"
|
|
" for TCM_VHOST\n");
|
|
return ret;
|
|
}
|
|
/*
|
|
* Setup our local pointer to *fabric
|
|
*/
|
|
tcm_vhost_fabric_configfs = fabric;
|
|
pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n");
|
|
return 0;
|
|
};
|
|
|
|
static void tcm_vhost_deregister_configfs(void)
|
|
{
|
|
if (!tcm_vhost_fabric_configfs)
|
|
return;
|
|
|
|
target_fabric_configfs_deregister(tcm_vhost_fabric_configfs);
|
|
tcm_vhost_fabric_configfs = NULL;
|
|
pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n");
|
|
};
|
|
|
|
static int __init tcm_vhost_init(void)
|
|
{
|
|
int ret = -ENOMEM;
|
|
/*
|
|
* Use our own dedicated workqueue for submitting I/O into
|
|
* target core to avoid contention within system_wq.
|
|
*/
|
|
tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0);
|
|
if (!tcm_vhost_workqueue)
|
|
goto out;
|
|
|
|
ret = vhost_scsi_register();
|
|
if (ret < 0)
|
|
goto out_destroy_workqueue;
|
|
|
|
ret = tcm_vhost_register_configfs();
|
|
if (ret < 0)
|
|
goto out_vhost_scsi_deregister;
|
|
|
|
return 0;
|
|
|
|
out_vhost_scsi_deregister:
|
|
vhost_scsi_deregister();
|
|
out_destroy_workqueue:
|
|
destroy_workqueue(tcm_vhost_workqueue);
|
|
out:
|
|
return ret;
|
|
};
|
|
|
|
static void tcm_vhost_exit(void)
|
|
{
|
|
tcm_vhost_deregister_configfs();
|
|
vhost_scsi_deregister();
|
|
destroy_workqueue(tcm_vhost_workqueue);
|
|
};
|
|
|
|
MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
|
|
MODULE_ALIAS("tcm_vhost");
|
|
MODULE_LICENSE("GPL");
|
|
module_init(tcm_vhost_init);
|
|
module_exit(tcm_vhost_exit);
|