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39f75da7bc
Delete/fixup few includes in anticipation of global -isystem compile option removal. Note: crypto/aegis128-neon-inner.c keeps <stddef.h> due to redefinition of uintptr_t error (one definition comes from <stddef.h>, another from <linux/types.h>). Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
1856 lines
46 KiB
C
1856 lines
46 KiB
C
/*
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* Xen SCSI backend driver
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*
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* Copyright (c) 2008, FUJITSU Limited
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*
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* Based on the blkback driver code.
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* Adaption to kernel taget core infrastructure taken from vhost/scsi.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#define pr_fmt(fmt) "xen-pvscsi: " fmt
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#include <linux/module.h>
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#include <linux/utsname.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/wait.h>
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#include <linux/sched.h>
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#include <linux/list.h>
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#include <linux/gfp.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/configfs.h>
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#include <generated/utsrelease.h>
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#include <scsi/scsi_host.h> /* SG_ALL */
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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 <asm/hypervisor.h>
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#include <xen/xen.h>
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#include <xen/balloon.h>
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#include <xen/events.h>
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#include <xen/xenbus.h>
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#include <xen/grant_table.h>
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#include <xen/page.h>
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#include <xen/interface/grant_table.h>
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#include <xen/interface/io/vscsiif.h>
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#define VSCSI_VERSION "v0.1"
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#define VSCSI_NAMELEN 32
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struct ids_tuple {
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unsigned int hst; /* host */
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unsigned int chn; /* channel */
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unsigned int tgt; /* target */
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unsigned int lun; /* LUN */
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};
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struct v2p_entry {
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struct ids_tuple v; /* translate from */
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struct scsiback_tpg *tpg; /* translate to */
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unsigned int lun;
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struct kref kref;
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struct list_head l;
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};
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struct vscsibk_info {
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struct xenbus_device *dev;
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domid_t domid;
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unsigned int irq;
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struct vscsiif_back_ring ring;
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spinlock_t ring_lock;
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atomic_t nr_unreplied_reqs;
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spinlock_t v2p_lock;
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struct list_head v2p_entry_lists;
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wait_queue_head_t waiting_to_free;
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struct gnttab_page_cache free_pages;
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};
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/* theoretical maximum of grants for one request */
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#define VSCSI_MAX_GRANTS (SG_ALL + VSCSIIF_SG_TABLESIZE)
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/*
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* VSCSI_GRANT_BATCH is the maximum number of grants to be processed in one
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* call to map/unmap grants. Don't choose it too large, as there are arrays
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* with VSCSI_GRANT_BATCH elements allocated on the stack.
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*/
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#define VSCSI_GRANT_BATCH 16
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struct vscsibk_pend {
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uint16_t rqid;
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uint8_t cmnd[VSCSIIF_MAX_COMMAND_SIZE];
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uint8_t cmd_len;
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uint8_t sc_data_direction;
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uint16_t n_sg; /* real length of SG list */
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uint16_t n_grants; /* SG pages and potentially SG list */
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uint32_t data_len;
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uint32_t result;
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struct vscsibk_info *info;
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struct v2p_entry *v2p;
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struct scatterlist *sgl;
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uint8_t sense_buffer[VSCSIIF_SENSE_BUFFERSIZE];
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grant_handle_t grant_handles[VSCSI_MAX_GRANTS];
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struct page *pages[VSCSI_MAX_GRANTS];
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struct se_cmd se_cmd;
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struct completion tmr_done;
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};
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#define VSCSI_DEFAULT_SESSION_TAGS 128
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struct scsiback_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 scsiback_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 pvscsi Target port */
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u64 tport_wwpn;
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/* ASCII formatted WWPN for pvscsi Target port */
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char tport_name[VSCSI_NAMELEN];
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/* Returned by scsiback_make_tport() */
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struct se_wwn tport_wwn;
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};
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struct scsiback_tpg {
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/* scsiback port target portal group tag for TCM */
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u16 tport_tpgt;
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/* track number of TPG Port/Lun Links wrt explicit I_T Nexus shutdown */
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int tv_tpg_port_count;
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/* xen-pvscsi references to tpg_nexus, protected by tv_tpg_mutex */
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int tv_tpg_fe_count;
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/* list for scsiback_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 pvscsi I_T Nexus for this TPG endpoint */
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struct scsiback_nexus *tpg_nexus;
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/* Pointer back to scsiback_tport */
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struct scsiback_tport *tport;
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/* Returned by scsiback_make_tpg() */
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struct se_portal_group se_tpg;
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/* alias used in xenstore */
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char param_alias[VSCSI_NAMELEN];
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/* list of info structures related to this target portal group */
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struct list_head info_list;
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};
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#define SCSIBACK_INVALID_HANDLE (~0)
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static bool log_print_stat;
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module_param(log_print_stat, bool, 0644);
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static int scsiback_max_buffer_pages = 1024;
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module_param_named(max_buffer_pages, scsiback_max_buffer_pages, int, 0644);
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MODULE_PARM_DESC(max_buffer_pages,
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"Maximum number of free pages to keep in backend buffer");
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/* Global spinlock to protect scsiback TPG list */
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static DEFINE_MUTEX(scsiback_mutex);
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static LIST_HEAD(scsiback_list);
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static void scsiback_get(struct vscsibk_info *info)
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{
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atomic_inc(&info->nr_unreplied_reqs);
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}
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static void scsiback_put(struct vscsibk_info *info)
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{
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if (atomic_dec_and_test(&info->nr_unreplied_reqs))
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wake_up(&info->waiting_to_free);
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}
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static unsigned long vaddr_page(struct page *page)
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{
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unsigned long pfn = page_to_pfn(page);
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return (unsigned long)pfn_to_kaddr(pfn);
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}
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static unsigned long vaddr(struct vscsibk_pend *req, int seg)
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{
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return vaddr_page(req->pages[seg]);
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}
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static void scsiback_print_status(char *sense_buffer, int errors,
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struct vscsibk_pend *pending_req)
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{
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struct scsiback_tpg *tpg = pending_req->v2p->tpg;
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pr_err("[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x\n",
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tpg->tport->tport_name, pending_req->v2p->lun,
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pending_req->cmnd[0], errors & 0xff, COMMAND_COMPLETE,
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host_byte(errors));
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}
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static void scsiback_fast_flush_area(struct vscsibk_pend *req)
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{
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struct gnttab_unmap_grant_ref unmap[VSCSI_GRANT_BATCH];
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struct page *pages[VSCSI_GRANT_BATCH];
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unsigned int i, invcount = 0;
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grant_handle_t handle;
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int err;
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kfree(req->sgl);
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req->sgl = NULL;
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req->n_sg = 0;
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if (!req->n_grants)
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return;
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for (i = 0; i < req->n_grants; i++) {
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handle = req->grant_handles[i];
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if (handle == SCSIBACK_INVALID_HANDLE)
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continue;
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gnttab_set_unmap_op(&unmap[invcount], vaddr(req, i),
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GNTMAP_host_map, handle);
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req->grant_handles[i] = SCSIBACK_INVALID_HANDLE;
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pages[invcount] = req->pages[i];
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put_page(pages[invcount]);
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invcount++;
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if (invcount < VSCSI_GRANT_BATCH)
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continue;
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err = gnttab_unmap_refs(unmap, NULL, pages, invcount);
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BUG_ON(err);
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invcount = 0;
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}
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if (invcount) {
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err = gnttab_unmap_refs(unmap, NULL, pages, invcount);
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BUG_ON(err);
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}
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gnttab_page_cache_put(&req->info->free_pages, req->pages,
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req->n_grants);
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req->n_grants = 0;
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}
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static void scsiback_free_translation_entry(struct kref *kref)
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{
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struct v2p_entry *entry = container_of(kref, struct v2p_entry, kref);
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struct scsiback_tpg *tpg = entry->tpg;
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mutex_lock(&tpg->tv_tpg_mutex);
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tpg->tv_tpg_fe_count--;
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mutex_unlock(&tpg->tv_tpg_mutex);
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kfree(entry);
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}
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static void scsiback_send_response(struct vscsibk_info *info,
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char *sense_buffer, int32_t result, uint32_t resid,
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uint16_t rqid)
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{
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struct vscsiif_response *ring_res;
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int notify;
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struct scsi_sense_hdr sshdr;
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unsigned long flags;
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unsigned len;
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spin_lock_irqsave(&info->ring_lock, flags);
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ring_res = RING_GET_RESPONSE(&info->ring, info->ring.rsp_prod_pvt);
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info->ring.rsp_prod_pvt++;
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ring_res->rslt = result;
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ring_res->rqid = rqid;
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if (sense_buffer != NULL &&
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scsi_normalize_sense(sense_buffer, VSCSIIF_SENSE_BUFFERSIZE,
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&sshdr)) {
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len = min_t(unsigned, 8 + sense_buffer[7],
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VSCSIIF_SENSE_BUFFERSIZE);
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memcpy(ring_res->sense_buffer, sense_buffer, len);
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ring_res->sense_len = len;
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} else {
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ring_res->sense_len = 0;
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}
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ring_res->residual_len = resid;
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RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&info->ring, notify);
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spin_unlock_irqrestore(&info->ring_lock, flags);
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if (notify)
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notify_remote_via_irq(info->irq);
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}
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static void scsiback_do_resp_with_sense(char *sense_buffer, int32_t result,
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uint32_t resid, struct vscsibk_pend *pending_req)
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{
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scsiback_send_response(pending_req->info, sense_buffer, result,
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resid, pending_req->rqid);
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if (pending_req->v2p)
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kref_put(&pending_req->v2p->kref,
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scsiback_free_translation_entry);
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}
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static void scsiback_cmd_done(struct vscsibk_pend *pending_req)
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{
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struct vscsibk_info *info = pending_req->info;
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unsigned char *sense_buffer;
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unsigned int resid;
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int errors;
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sense_buffer = pending_req->sense_buffer;
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resid = pending_req->se_cmd.residual_count;
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errors = pending_req->result;
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if (errors && log_print_stat)
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scsiback_print_status(sense_buffer, errors, pending_req);
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scsiback_fast_flush_area(pending_req);
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scsiback_do_resp_with_sense(sense_buffer, errors, resid, pending_req);
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scsiback_put(info);
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/*
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* Drop the extra KREF_ACK reference taken by target_submit_cmd_map_sgls()
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* ahead of scsiback_check_stop_free() -> transport_generic_free_cmd()
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* final se_cmd->cmd_kref put.
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*/
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target_put_sess_cmd(&pending_req->se_cmd);
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}
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static void scsiback_cmd_exec(struct vscsibk_pend *pending_req)
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{
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struct se_cmd *se_cmd = &pending_req->se_cmd;
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struct se_session *sess = pending_req->v2p->tpg->tpg_nexus->tvn_se_sess;
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scsiback_get(pending_req->info);
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se_cmd->tag = pending_req->rqid;
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target_init_cmd(se_cmd, sess, pending_req->sense_buffer,
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pending_req->v2p->lun, pending_req->data_len, 0,
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pending_req->sc_data_direction, TARGET_SCF_ACK_KREF);
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if (target_submit_prep(se_cmd, pending_req->cmnd, pending_req->sgl,
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pending_req->n_sg, NULL, 0, NULL, 0, GFP_KERNEL))
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return;
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target_submit(se_cmd);
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}
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static int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map,
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struct page **pg, grant_handle_t *grant, int cnt)
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{
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int err, i;
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if (!cnt)
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return 0;
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err = gnttab_map_refs(map, NULL, pg, cnt);
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for (i = 0; i < cnt; i++) {
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if (unlikely(map[i].status != GNTST_okay)) {
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pr_err("invalid buffer -- could not remap it\n");
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map[i].handle = SCSIBACK_INVALID_HANDLE;
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if (!err)
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err = -ENOMEM;
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} else {
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get_page(pg[i]);
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}
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grant[i] = map[i].handle;
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}
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return err;
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}
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static int scsiback_gnttab_data_map_list(struct vscsibk_pend *pending_req,
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struct scsiif_request_segment *seg, struct page **pg,
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grant_handle_t *grant, int cnt, u32 flags)
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{
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int mapcount = 0, i, err = 0;
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struct gnttab_map_grant_ref map[VSCSI_GRANT_BATCH];
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struct vscsibk_info *info = pending_req->info;
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for (i = 0; i < cnt; i++) {
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if (gnttab_page_cache_get(&info->free_pages, pg + mapcount)) {
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gnttab_page_cache_put(&info->free_pages, pg, mapcount);
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pr_err("no grant page\n");
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return -ENOMEM;
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}
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gnttab_set_map_op(&map[mapcount], vaddr_page(pg[mapcount]),
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flags, seg[i].gref, info->domid);
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mapcount++;
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if (mapcount < VSCSI_GRANT_BATCH)
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continue;
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err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount);
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pg += mapcount;
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grant += mapcount;
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pending_req->n_grants += mapcount;
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if (err)
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return err;
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mapcount = 0;
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}
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err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount);
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pending_req->n_grants += mapcount;
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return err;
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}
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static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req,
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struct vscsibk_pend *pending_req)
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{
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u32 flags;
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int i, err, n_segs, i_seg = 0;
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struct page **pg;
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struct scsiif_request_segment *seg;
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unsigned long end_seg = 0;
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unsigned int nr_segments = (unsigned int)ring_req->nr_segments;
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unsigned int nr_sgl = 0;
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struct scatterlist *sg;
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grant_handle_t *grant;
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pending_req->n_sg = 0;
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pending_req->n_grants = 0;
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pending_req->data_len = 0;
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nr_segments &= ~VSCSIIF_SG_GRANT;
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if (!nr_segments)
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return 0;
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if (nr_segments > VSCSIIF_SG_TABLESIZE) {
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pr_debug("invalid parameter nr_seg = %d\n",
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ring_req->nr_segments);
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return -EINVAL;
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}
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if (ring_req->nr_segments & VSCSIIF_SG_GRANT) {
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err = scsiback_gnttab_data_map_list(pending_req, ring_req->seg,
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pending_req->pages, pending_req->grant_handles,
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nr_segments, GNTMAP_host_map | GNTMAP_readonly);
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if (err)
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return err;
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nr_sgl = nr_segments;
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nr_segments = 0;
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for (i = 0; i < nr_sgl; i++) {
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n_segs = ring_req->seg[i].length /
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sizeof(struct scsiif_request_segment);
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if ((unsigned)ring_req->seg[i].offset +
|
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(unsigned)ring_req->seg[i].length > PAGE_SIZE ||
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n_segs * sizeof(struct scsiif_request_segment) !=
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ring_req->seg[i].length)
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return -EINVAL;
|
|
nr_segments += n_segs;
|
|
}
|
|
if (nr_segments > SG_ALL) {
|
|
pr_debug("invalid nr_seg = %d\n", nr_segments);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/* free of (sgl) in fast_flush_area() */
|
|
pending_req->sgl = kmalloc_array(nr_segments,
|
|
sizeof(struct scatterlist), GFP_KERNEL);
|
|
if (!pending_req->sgl)
|
|
return -ENOMEM;
|
|
|
|
sg_init_table(pending_req->sgl, nr_segments);
|
|
pending_req->n_sg = nr_segments;
|
|
|
|
flags = GNTMAP_host_map;
|
|
if (pending_req->sc_data_direction == DMA_TO_DEVICE)
|
|
flags |= GNTMAP_readonly;
|
|
|
|
pg = pending_req->pages + nr_sgl;
|
|
grant = pending_req->grant_handles + nr_sgl;
|
|
if (!nr_sgl) {
|
|
seg = ring_req->seg;
|
|
err = scsiback_gnttab_data_map_list(pending_req, seg,
|
|
pg, grant, nr_segments, flags);
|
|
if (err)
|
|
return err;
|
|
} else {
|
|
for (i = 0; i < nr_sgl; i++) {
|
|
seg = (struct scsiif_request_segment *)(
|
|
vaddr(pending_req, i) + ring_req->seg[i].offset);
|
|
n_segs = ring_req->seg[i].length /
|
|
sizeof(struct scsiif_request_segment);
|
|
err = scsiback_gnttab_data_map_list(pending_req, seg,
|
|
pg, grant, n_segs, flags);
|
|
if (err)
|
|
return err;
|
|
pg += n_segs;
|
|
grant += n_segs;
|
|
}
|
|
end_seg = vaddr(pending_req, 0) + ring_req->seg[0].offset;
|
|
seg = (struct scsiif_request_segment *)end_seg;
|
|
end_seg += ring_req->seg[0].length;
|
|
pg = pending_req->pages + nr_sgl;
|
|
}
|
|
|
|
for_each_sg(pending_req->sgl, sg, nr_segments, i) {
|
|
sg_set_page(sg, pg[i], seg->length, seg->offset);
|
|
pending_req->data_len += seg->length;
|
|
seg++;
|
|
if (nr_sgl && (unsigned long)seg >= end_seg) {
|
|
i_seg++;
|
|
end_seg = vaddr(pending_req, i_seg) +
|
|
ring_req->seg[i_seg].offset;
|
|
seg = (struct scsiif_request_segment *)end_seg;
|
|
end_seg += ring_req->seg[i_seg].length;
|
|
}
|
|
if (sg->offset >= PAGE_SIZE ||
|
|
sg->length > PAGE_SIZE ||
|
|
sg->offset + sg->length > PAGE_SIZE)
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void scsiback_disconnect(struct vscsibk_info *info)
|
|
{
|
|
wait_event(info->waiting_to_free,
|
|
atomic_read(&info->nr_unreplied_reqs) == 0);
|
|
|
|
unbind_from_irqhandler(info->irq, info);
|
|
info->irq = 0;
|
|
xenbus_unmap_ring_vfree(info->dev, info->ring.sring);
|
|
}
|
|
|
|
static void scsiback_device_action(struct vscsibk_pend *pending_req,
|
|
enum tcm_tmreq_table act, int tag)
|
|
{
|
|
struct scsiback_tpg *tpg = pending_req->v2p->tpg;
|
|
struct scsiback_nexus *nexus = tpg->tpg_nexus;
|
|
struct se_cmd *se_cmd = &pending_req->se_cmd;
|
|
u64 unpacked_lun = pending_req->v2p->lun;
|
|
int rc, err = FAILED;
|
|
|
|
init_completion(&pending_req->tmr_done);
|
|
|
|
rc = target_submit_tmr(&pending_req->se_cmd, nexus->tvn_se_sess,
|
|
&pending_req->sense_buffer[0],
|
|
unpacked_lun, NULL, act, GFP_KERNEL,
|
|
tag, TARGET_SCF_ACK_KREF);
|
|
if (rc)
|
|
goto err;
|
|
|
|
wait_for_completion(&pending_req->tmr_done);
|
|
|
|
err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ?
|
|
SUCCESS : FAILED;
|
|
|
|
scsiback_do_resp_with_sense(NULL, err, 0, pending_req);
|
|
transport_generic_free_cmd(&pending_req->se_cmd, 0);
|
|
return;
|
|
|
|
err:
|
|
scsiback_do_resp_with_sense(NULL, err, 0, pending_req);
|
|
}
|
|
|
|
/*
|
|
Perform virtual to physical translation
|
|
*/
|
|
static struct v2p_entry *scsiback_do_translation(struct vscsibk_info *info,
|
|
struct ids_tuple *v)
|
|
{
|
|
struct v2p_entry *entry;
|
|
struct list_head *head = &(info->v2p_entry_lists);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->v2p_lock, flags);
|
|
list_for_each_entry(entry, head, l) {
|
|
if ((entry->v.chn == v->chn) &&
|
|
(entry->v.tgt == v->tgt) &&
|
|
(entry->v.lun == v->lun)) {
|
|
kref_get(&entry->kref);
|
|
goto out;
|
|
}
|
|
}
|
|
entry = NULL;
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&info->v2p_lock, flags);
|
|
return entry;
|
|
}
|
|
|
|
static struct vscsibk_pend *scsiback_get_pend_req(struct vscsiif_back_ring *ring,
|
|
struct v2p_entry *v2p)
|
|
{
|
|
struct scsiback_tpg *tpg = v2p->tpg;
|
|
struct scsiback_nexus *nexus = tpg->tpg_nexus;
|
|
struct se_session *se_sess = nexus->tvn_se_sess;
|
|
struct vscsibk_pend *req;
|
|
int tag, cpu, i;
|
|
|
|
tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
|
|
if (tag < 0) {
|
|
pr_err("Unable to obtain tag for vscsiif_request\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
req = &((struct vscsibk_pend *)se_sess->sess_cmd_map)[tag];
|
|
memset(req, 0, sizeof(*req));
|
|
req->se_cmd.map_tag = tag;
|
|
req->se_cmd.map_cpu = cpu;
|
|
|
|
for (i = 0; i < VSCSI_MAX_GRANTS; i++)
|
|
req->grant_handles[i] = SCSIBACK_INVALID_HANDLE;
|
|
|
|
return req;
|
|
}
|
|
|
|
static struct vscsibk_pend *prepare_pending_reqs(struct vscsibk_info *info,
|
|
struct vscsiif_back_ring *ring,
|
|
struct vscsiif_request *ring_req)
|
|
{
|
|
struct vscsibk_pend *pending_req;
|
|
struct v2p_entry *v2p;
|
|
struct ids_tuple vir;
|
|
|
|
/* request range check from frontend */
|
|
if ((ring_req->sc_data_direction != DMA_BIDIRECTIONAL) &&
|
|
(ring_req->sc_data_direction != DMA_TO_DEVICE) &&
|
|
(ring_req->sc_data_direction != DMA_FROM_DEVICE) &&
|
|
(ring_req->sc_data_direction != DMA_NONE)) {
|
|
pr_debug("invalid parameter data_dir = %d\n",
|
|
ring_req->sc_data_direction);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
if (ring_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) {
|
|
pr_debug("invalid parameter cmd_len = %d\n",
|
|
ring_req->cmd_len);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
vir.chn = ring_req->channel;
|
|
vir.tgt = ring_req->id;
|
|
vir.lun = ring_req->lun;
|
|
|
|
v2p = scsiback_do_translation(info, &vir);
|
|
if (!v2p) {
|
|
pr_debug("the v2p of (chn:%d, tgt:%d, lun:%d) doesn't exist.\n",
|
|
vir.chn, vir.tgt, vir.lun);
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
pending_req = scsiback_get_pend_req(ring, v2p);
|
|
if (IS_ERR(pending_req)) {
|
|
kref_put(&v2p->kref, scsiback_free_translation_entry);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
pending_req->rqid = ring_req->rqid;
|
|
pending_req->info = info;
|
|
pending_req->v2p = v2p;
|
|
pending_req->sc_data_direction = ring_req->sc_data_direction;
|
|
pending_req->cmd_len = ring_req->cmd_len;
|
|
memcpy(pending_req->cmnd, ring_req->cmnd, pending_req->cmd_len);
|
|
|
|
return pending_req;
|
|
}
|
|
|
|
static int scsiback_do_cmd_fn(struct vscsibk_info *info,
|
|
unsigned int *eoi_flags)
|
|
{
|
|
struct vscsiif_back_ring *ring = &info->ring;
|
|
struct vscsiif_request ring_req;
|
|
struct vscsibk_pend *pending_req;
|
|
RING_IDX rc, rp;
|
|
int more_to_do;
|
|
uint32_t result;
|
|
|
|
rc = ring->req_cons;
|
|
rp = ring->sring->req_prod;
|
|
rmb(); /* guest system is accessing ring, too */
|
|
|
|
if (RING_REQUEST_PROD_OVERFLOW(ring, rp)) {
|
|
rc = ring->rsp_prod_pvt;
|
|
pr_warn("Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n",
|
|
info->domid, rp, rc, rp - rc);
|
|
return -EINVAL;
|
|
}
|
|
|
|
while ((rc != rp)) {
|
|
*eoi_flags &= ~XEN_EOI_FLAG_SPURIOUS;
|
|
|
|
if (RING_REQUEST_CONS_OVERFLOW(ring, rc))
|
|
break;
|
|
|
|
RING_COPY_REQUEST(ring, rc, &ring_req);
|
|
ring->req_cons = ++rc;
|
|
|
|
pending_req = prepare_pending_reqs(info, ring, &ring_req);
|
|
if (IS_ERR(pending_req)) {
|
|
switch (PTR_ERR(pending_req)) {
|
|
case -ENODEV:
|
|
result = DID_NO_CONNECT;
|
|
break;
|
|
default:
|
|
result = DID_ERROR;
|
|
break;
|
|
}
|
|
scsiback_send_response(info, NULL, result << 16, 0,
|
|
ring_req.rqid);
|
|
return 1;
|
|
}
|
|
|
|
switch (ring_req.act) {
|
|
case VSCSIIF_ACT_SCSI_CDB:
|
|
if (scsiback_gnttab_data_map(&ring_req, pending_req)) {
|
|
scsiback_fast_flush_area(pending_req);
|
|
scsiback_do_resp_with_sense(NULL,
|
|
DID_ERROR << 16, 0, pending_req);
|
|
transport_generic_free_cmd(&pending_req->se_cmd, 0);
|
|
} else {
|
|
scsiback_cmd_exec(pending_req);
|
|
}
|
|
break;
|
|
case VSCSIIF_ACT_SCSI_ABORT:
|
|
scsiback_device_action(pending_req, TMR_ABORT_TASK,
|
|
ring_req.ref_rqid);
|
|
break;
|
|
case VSCSIIF_ACT_SCSI_RESET:
|
|
scsiback_device_action(pending_req, TMR_LUN_RESET, 0);
|
|
break;
|
|
default:
|
|
pr_err_ratelimited("invalid request\n");
|
|
scsiback_do_resp_with_sense(NULL, DID_ERROR << 16, 0,
|
|
pending_req);
|
|
transport_generic_free_cmd(&pending_req->se_cmd, 0);
|
|
break;
|
|
}
|
|
|
|
/* Yield point for this unbounded loop. */
|
|
cond_resched();
|
|
}
|
|
|
|
gnttab_page_cache_shrink(&info->free_pages, scsiback_max_buffer_pages);
|
|
|
|
RING_FINAL_CHECK_FOR_REQUESTS(&info->ring, more_to_do);
|
|
return more_to_do;
|
|
}
|
|
|
|
static irqreturn_t scsiback_irq_fn(int irq, void *dev_id)
|
|
{
|
|
struct vscsibk_info *info = dev_id;
|
|
int rc;
|
|
unsigned int eoi_flags = XEN_EOI_FLAG_SPURIOUS;
|
|
|
|
while ((rc = scsiback_do_cmd_fn(info, &eoi_flags)) > 0)
|
|
cond_resched();
|
|
|
|
/* In case of a ring error we keep the event channel masked. */
|
|
if (!rc)
|
|
xen_irq_lateeoi(irq, eoi_flags);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int scsiback_init_sring(struct vscsibk_info *info, grant_ref_t ring_ref,
|
|
evtchn_port_t evtchn)
|
|
{
|
|
void *area;
|
|
struct vscsiif_sring *sring;
|
|
int err;
|
|
|
|
if (info->irq)
|
|
return -1;
|
|
|
|
err = xenbus_map_ring_valloc(info->dev, &ring_ref, 1, &area);
|
|
if (err)
|
|
return err;
|
|
|
|
sring = (struct vscsiif_sring *)area;
|
|
BACK_RING_INIT(&info->ring, sring, PAGE_SIZE);
|
|
|
|
err = bind_interdomain_evtchn_to_irq_lateeoi(info->dev, evtchn);
|
|
if (err < 0)
|
|
goto unmap_page;
|
|
|
|
info->irq = err;
|
|
|
|
err = request_threaded_irq(info->irq, NULL, scsiback_irq_fn,
|
|
IRQF_ONESHOT, "vscsiif-backend", info);
|
|
if (err)
|
|
goto free_irq;
|
|
|
|
return 0;
|
|
|
|
free_irq:
|
|
unbind_from_irqhandler(info->irq, info);
|
|
info->irq = 0;
|
|
unmap_page:
|
|
xenbus_unmap_ring_vfree(info->dev, area);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int scsiback_map(struct vscsibk_info *info)
|
|
{
|
|
struct xenbus_device *dev = info->dev;
|
|
unsigned int ring_ref;
|
|
evtchn_port_t evtchn;
|
|
int err;
|
|
|
|
err = xenbus_gather(XBT_NIL, dev->otherend,
|
|
"ring-ref", "%u", &ring_ref,
|
|
"event-channel", "%u", &evtchn, NULL);
|
|
if (err) {
|
|
xenbus_dev_fatal(dev, err, "reading %s ring", dev->otherend);
|
|
return err;
|
|
}
|
|
|
|
return scsiback_init_sring(info, ring_ref, evtchn);
|
|
}
|
|
|
|
/*
|
|
Check for a translation entry being present
|
|
*/
|
|
static struct v2p_entry *scsiback_chk_translation_entry(
|
|
struct vscsibk_info *info, struct ids_tuple *v)
|
|
{
|
|
struct list_head *head = &(info->v2p_entry_lists);
|
|
struct v2p_entry *entry;
|
|
|
|
list_for_each_entry(entry, head, l)
|
|
if ((entry->v.chn == v->chn) &&
|
|
(entry->v.tgt == v->tgt) &&
|
|
(entry->v.lun == v->lun))
|
|
return entry;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
Add a new translation entry
|
|
*/
|
|
static int scsiback_add_translation_entry(struct vscsibk_info *info,
|
|
char *phy, struct ids_tuple *v)
|
|
{
|
|
int err = 0;
|
|
struct v2p_entry *new;
|
|
unsigned long flags;
|
|
char *lunp;
|
|
unsigned long long unpacked_lun;
|
|
struct se_lun *se_lun;
|
|
struct scsiback_tpg *tpg_entry, *tpg = NULL;
|
|
char *error = "doesn't exist";
|
|
|
|
lunp = strrchr(phy, ':');
|
|
if (!lunp) {
|
|
pr_err("illegal format of physical device %s\n", phy);
|
|
return -EINVAL;
|
|
}
|
|
*lunp = 0;
|
|
lunp++;
|
|
err = kstrtoull(lunp, 10, &unpacked_lun);
|
|
if (err < 0) {
|
|
pr_err("lun number not valid: %s\n", lunp);
|
|
return err;
|
|
}
|
|
|
|
mutex_lock(&scsiback_mutex);
|
|
list_for_each_entry(tpg_entry, &scsiback_list, tv_tpg_list) {
|
|
if (!strcmp(phy, tpg_entry->tport->tport_name) ||
|
|
!strcmp(phy, tpg_entry->param_alias)) {
|
|
mutex_lock(&tpg_entry->se_tpg.tpg_lun_mutex);
|
|
hlist_for_each_entry(se_lun, &tpg_entry->se_tpg.tpg_lun_hlist, link) {
|
|
if (se_lun->unpacked_lun == unpacked_lun) {
|
|
if (!tpg_entry->tpg_nexus)
|
|
error = "nexus undefined";
|
|
else
|
|
tpg = tpg_entry;
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&tpg_entry->se_tpg.tpg_lun_mutex);
|
|
break;
|
|
}
|
|
}
|
|
if (tpg) {
|
|
mutex_lock(&tpg->tv_tpg_mutex);
|
|
tpg->tv_tpg_fe_count++;
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
}
|
|
mutex_unlock(&scsiback_mutex);
|
|
|
|
if (!tpg) {
|
|
pr_err("%s:%llu %s\n", phy, unpacked_lun, error);
|
|
return -ENODEV;
|
|
}
|
|
|
|
new = kmalloc(sizeof(struct v2p_entry), GFP_KERNEL);
|
|
if (new == NULL) {
|
|
err = -ENOMEM;
|
|
goto out_free;
|
|
}
|
|
|
|
spin_lock_irqsave(&info->v2p_lock, flags);
|
|
|
|
/* Check double assignment to identical virtual ID */
|
|
if (scsiback_chk_translation_entry(info, v)) {
|
|
pr_warn("Virtual ID is already used. Assignment was not performed.\n");
|
|
err = -EEXIST;
|
|
goto out;
|
|
}
|
|
|
|
/* Create a new translation entry and add to the list */
|
|
kref_init(&new->kref);
|
|
new->v = *v;
|
|
new->tpg = tpg;
|
|
new->lun = unpacked_lun;
|
|
list_add_tail(&new->l, &info->v2p_entry_lists);
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&info->v2p_lock, flags);
|
|
|
|
out_free:
|
|
if (err) {
|
|
mutex_lock(&tpg->tv_tpg_mutex);
|
|
tpg->tv_tpg_fe_count--;
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
kfree(new);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __scsiback_del_translation_entry(struct v2p_entry *entry)
|
|
{
|
|
list_del(&entry->l);
|
|
kref_put(&entry->kref, scsiback_free_translation_entry);
|
|
}
|
|
|
|
/*
|
|
Delete the translation entry specified
|
|
*/
|
|
static int scsiback_del_translation_entry(struct vscsibk_info *info,
|
|
struct ids_tuple *v)
|
|
{
|
|
struct v2p_entry *entry;
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
spin_lock_irqsave(&info->v2p_lock, flags);
|
|
/* Find out the translation entry specified */
|
|
entry = scsiback_chk_translation_entry(info, v);
|
|
if (entry)
|
|
__scsiback_del_translation_entry(entry);
|
|
else
|
|
ret = -ENOENT;
|
|
|
|
spin_unlock_irqrestore(&info->v2p_lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state,
|
|
char *phy, struct ids_tuple *vir, int try)
|
|
{
|
|
struct v2p_entry *entry;
|
|
unsigned long flags;
|
|
int err;
|
|
|
|
if (try) {
|
|
spin_lock_irqsave(&info->v2p_lock, flags);
|
|
entry = scsiback_chk_translation_entry(info, vir);
|
|
spin_unlock_irqrestore(&info->v2p_lock, flags);
|
|
if (entry)
|
|
return;
|
|
}
|
|
if (!scsiback_add_translation_entry(info, phy, vir)) {
|
|
if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
|
|
"%d", XenbusStateInitialised)) {
|
|
pr_err("xenbus_printf error %s\n", state);
|
|
scsiback_del_translation_entry(info, vir);
|
|
}
|
|
} else if (!try) {
|
|
err = xenbus_printf(XBT_NIL, info->dev->nodename, state,
|
|
"%d", XenbusStateClosed);
|
|
if (err)
|
|
xenbus_dev_error(info->dev, err,
|
|
"%s: writing %s", __func__, state);
|
|
}
|
|
}
|
|
|
|
static void scsiback_do_del_lun(struct vscsibk_info *info, const char *state,
|
|
struct ids_tuple *vir)
|
|
{
|
|
if (!scsiback_del_translation_entry(info, vir)) {
|
|
if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
|
|
"%d", XenbusStateClosed))
|
|
pr_err("xenbus_printf error %s\n", state);
|
|
}
|
|
}
|
|
|
|
#define VSCSIBACK_OP_ADD_OR_DEL_LUN 1
|
|
#define VSCSIBACK_OP_UPDATEDEV_STATE 2
|
|
|
|
static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op,
|
|
char *ent)
|
|
{
|
|
int err;
|
|
struct ids_tuple vir;
|
|
char *val;
|
|
int device_state;
|
|
char phy[VSCSI_NAMELEN];
|
|
char str[64];
|
|
char state[64];
|
|
struct xenbus_device *dev = info->dev;
|
|
|
|
/* read status */
|
|
snprintf(state, sizeof(state), "vscsi-devs/%s/state", ent);
|
|
err = xenbus_scanf(XBT_NIL, dev->nodename, state, "%u", &device_state);
|
|
if (XENBUS_EXIST_ERR(err))
|
|
return;
|
|
|
|
/* physical SCSI device */
|
|
snprintf(str, sizeof(str), "vscsi-devs/%s/p-dev", ent);
|
|
val = xenbus_read(XBT_NIL, dev->nodename, str, NULL);
|
|
if (IS_ERR(val)) {
|
|
err = xenbus_printf(XBT_NIL, dev->nodename, state,
|
|
"%d", XenbusStateClosed);
|
|
if (err)
|
|
xenbus_dev_error(info->dev, err,
|
|
"%s: writing %s", __func__, state);
|
|
return;
|
|
}
|
|
strlcpy(phy, val, VSCSI_NAMELEN);
|
|
kfree(val);
|
|
|
|
/* virtual SCSI device */
|
|
snprintf(str, sizeof(str), "vscsi-devs/%s/v-dev", ent);
|
|
err = xenbus_scanf(XBT_NIL, dev->nodename, str, "%u:%u:%u:%u",
|
|
&vir.hst, &vir.chn, &vir.tgt, &vir.lun);
|
|
if (XENBUS_EXIST_ERR(err)) {
|
|
err = xenbus_printf(XBT_NIL, dev->nodename, state,
|
|
"%d", XenbusStateClosed);
|
|
if (err)
|
|
xenbus_dev_error(info->dev, err,
|
|
"%s: writing %s", __func__, state);
|
|
return;
|
|
}
|
|
|
|
switch (op) {
|
|
case VSCSIBACK_OP_ADD_OR_DEL_LUN:
|
|
switch (device_state) {
|
|
case XenbusStateInitialising:
|
|
scsiback_do_add_lun(info, state, phy, &vir, 0);
|
|
break;
|
|
case XenbusStateConnected:
|
|
scsiback_do_add_lun(info, state, phy, &vir, 1);
|
|
break;
|
|
case XenbusStateClosing:
|
|
scsiback_do_del_lun(info, state, &vir);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case VSCSIBACK_OP_UPDATEDEV_STATE:
|
|
if (device_state == XenbusStateInitialised) {
|
|
/* modify vscsi-devs/dev-x/state */
|
|
if (xenbus_printf(XBT_NIL, dev->nodename, state,
|
|
"%d", XenbusStateConnected)) {
|
|
pr_err("xenbus_printf error %s\n", str);
|
|
scsiback_del_translation_entry(info, &vir);
|
|
xenbus_printf(XBT_NIL, dev->nodename, state,
|
|
"%d", XenbusStateClosed);
|
|
}
|
|
}
|
|
break;
|
|
/* When it is necessary, processing is added here. */
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void scsiback_do_lun_hotplug(struct vscsibk_info *info, int op)
|
|
{
|
|
int i;
|
|
char **dir;
|
|
unsigned int ndir = 0;
|
|
|
|
dir = xenbus_directory(XBT_NIL, info->dev->nodename, "vscsi-devs",
|
|
&ndir);
|
|
if (IS_ERR(dir))
|
|
return;
|
|
|
|
for (i = 0; i < ndir; i++)
|
|
scsiback_do_1lun_hotplug(info, op, dir[i]);
|
|
|
|
kfree(dir);
|
|
}
|
|
|
|
static void scsiback_frontend_changed(struct xenbus_device *dev,
|
|
enum xenbus_state frontend_state)
|
|
{
|
|
struct vscsibk_info *info = dev_get_drvdata(&dev->dev);
|
|
|
|
switch (frontend_state) {
|
|
case XenbusStateInitialising:
|
|
break;
|
|
|
|
case XenbusStateInitialised:
|
|
if (scsiback_map(info))
|
|
break;
|
|
|
|
scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN);
|
|
xenbus_switch_state(dev, XenbusStateConnected);
|
|
break;
|
|
|
|
case XenbusStateConnected:
|
|
scsiback_do_lun_hotplug(info, VSCSIBACK_OP_UPDATEDEV_STATE);
|
|
|
|
if (dev->state == XenbusStateConnected)
|
|
break;
|
|
|
|
xenbus_switch_state(dev, XenbusStateConnected);
|
|
break;
|
|
|
|
case XenbusStateClosing:
|
|
if (info->irq)
|
|
scsiback_disconnect(info);
|
|
|
|
xenbus_switch_state(dev, XenbusStateClosing);
|
|
break;
|
|
|
|
case XenbusStateClosed:
|
|
xenbus_switch_state(dev, XenbusStateClosed);
|
|
if (xenbus_dev_is_online(dev))
|
|
break;
|
|
fallthrough; /* if not online */
|
|
case XenbusStateUnknown:
|
|
device_unregister(&dev->dev);
|
|
break;
|
|
|
|
case XenbusStateReconfiguring:
|
|
scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN);
|
|
xenbus_switch_state(dev, XenbusStateReconfigured);
|
|
|
|
break;
|
|
|
|
default:
|
|
xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend",
|
|
frontend_state);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
Release the translation entry specfied
|
|
*/
|
|
static void scsiback_release_translation_entry(struct vscsibk_info *info)
|
|
{
|
|
struct v2p_entry *entry, *tmp;
|
|
struct list_head *head = &(info->v2p_entry_lists);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->v2p_lock, flags);
|
|
|
|
list_for_each_entry_safe(entry, tmp, head, l)
|
|
__scsiback_del_translation_entry(entry);
|
|
|
|
spin_unlock_irqrestore(&info->v2p_lock, flags);
|
|
}
|
|
|
|
static int scsiback_remove(struct xenbus_device *dev)
|
|
{
|
|
struct vscsibk_info *info = dev_get_drvdata(&dev->dev);
|
|
|
|
if (info->irq)
|
|
scsiback_disconnect(info);
|
|
|
|
scsiback_release_translation_entry(info);
|
|
|
|
gnttab_page_cache_shrink(&info->free_pages, 0);
|
|
|
|
dev_set_drvdata(&dev->dev, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int scsiback_probe(struct xenbus_device *dev,
|
|
const struct xenbus_device_id *id)
|
|
{
|
|
int err;
|
|
|
|
struct vscsibk_info *info = kzalloc(sizeof(struct vscsibk_info),
|
|
GFP_KERNEL);
|
|
|
|
pr_debug("%s %p %d\n", __func__, dev, dev->otherend_id);
|
|
|
|
if (!info) {
|
|
xenbus_dev_fatal(dev, -ENOMEM, "allocating backend structure");
|
|
return -ENOMEM;
|
|
}
|
|
info->dev = dev;
|
|
dev_set_drvdata(&dev->dev, info);
|
|
|
|
info->domid = dev->otherend_id;
|
|
spin_lock_init(&info->ring_lock);
|
|
atomic_set(&info->nr_unreplied_reqs, 0);
|
|
init_waitqueue_head(&info->waiting_to_free);
|
|
info->dev = dev;
|
|
info->irq = 0;
|
|
INIT_LIST_HEAD(&info->v2p_entry_lists);
|
|
spin_lock_init(&info->v2p_lock);
|
|
gnttab_page_cache_init(&info->free_pages);
|
|
|
|
err = xenbus_printf(XBT_NIL, dev->nodename, "feature-sg-grant", "%u",
|
|
SG_ALL);
|
|
if (err)
|
|
xenbus_dev_error(dev, err, "writing feature-sg-grant");
|
|
|
|
err = xenbus_switch_state(dev, XenbusStateInitWait);
|
|
if (err)
|
|
goto fail;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
pr_warn("%s failed\n", __func__);
|
|
scsiback_remove(dev);
|
|
|
|
return err;
|
|
}
|
|
|
|
static char *scsiback_dump_proto_id(struct scsiback_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 char *scsiback_get_fabric_wwn(struct se_portal_group *se_tpg)
|
|
{
|
|
struct scsiback_tpg *tpg = container_of(se_tpg,
|
|
struct scsiback_tpg, se_tpg);
|
|
struct scsiback_tport *tport = tpg->tport;
|
|
|
|
return &tport->tport_name[0];
|
|
}
|
|
|
|
static u16 scsiback_get_tag(struct se_portal_group *se_tpg)
|
|
{
|
|
struct scsiback_tpg *tpg = container_of(se_tpg,
|
|
struct scsiback_tpg, se_tpg);
|
|
return tpg->tport_tpgt;
|
|
}
|
|
|
|
static struct se_wwn *
|
|
scsiback_make_tport(struct target_fabric_configfs *tf,
|
|
struct config_group *group,
|
|
const char *name)
|
|
{
|
|
struct scsiback_tport *tport;
|
|
char *ptr;
|
|
u64 wwpn = 0;
|
|
int off = 0;
|
|
|
|
tport = kzalloc(sizeof(struct scsiback_tport), GFP_KERNEL);
|
|
if (!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) >= VSCSI_NAMELEN) {
|
|
pr_err("Emulated %s Address: %s, exceeds max: %d\n", name,
|
|
scsiback_dump_proto_id(tport), VSCSI_NAMELEN);
|
|
kfree(tport);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
snprintf(&tport->tport_name[0], VSCSI_NAMELEN, "%s", &name[off]);
|
|
|
|
pr_debug("Allocated emulated Target %s Address: %s\n",
|
|
scsiback_dump_proto_id(tport), name);
|
|
|
|
return &tport->tport_wwn;
|
|
}
|
|
|
|
static void scsiback_drop_tport(struct se_wwn *wwn)
|
|
{
|
|
struct scsiback_tport *tport = container_of(wwn,
|
|
struct scsiback_tport, tport_wwn);
|
|
|
|
pr_debug("Deallocating emulated Target %s Address: %s\n",
|
|
scsiback_dump_proto_id(tport), tport->tport_name);
|
|
|
|
kfree(tport);
|
|
}
|
|
|
|
static u32 scsiback_tpg_get_inst_index(struct se_portal_group *se_tpg)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int scsiback_check_stop_free(struct se_cmd *se_cmd)
|
|
{
|
|
return transport_generic_free_cmd(se_cmd, 0);
|
|
}
|
|
|
|
static void scsiback_release_cmd(struct se_cmd *se_cmd)
|
|
{
|
|
target_free_tag(se_cmd->se_sess, se_cmd);
|
|
}
|
|
|
|
static u32 scsiback_sess_get_index(struct se_session *se_sess)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int scsiback_write_pending(struct se_cmd *se_cmd)
|
|
{
|
|
/* Go ahead and process the write immediately */
|
|
target_execute_cmd(se_cmd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void scsiback_set_default_node_attrs(struct se_node_acl *nacl)
|
|
{
|
|
}
|
|
|
|
static int scsiback_get_cmd_state(struct se_cmd *se_cmd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int scsiback_queue_data_in(struct se_cmd *se_cmd)
|
|
{
|
|
struct vscsibk_pend *pending_req = container_of(se_cmd,
|
|
struct vscsibk_pend, se_cmd);
|
|
|
|
pending_req->result = SAM_STAT_GOOD;
|
|
scsiback_cmd_done(pending_req);
|
|
return 0;
|
|
}
|
|
|
|
static int scsiback_queue_status(struct se_cmd *se_cmd)
|
|
{
|
|
struct vscsibk_pend *pending_req = container_of(se_cmd,
|
|
struct vscsibk_pend, se_cmd);
|
|
|
|
if (se_cmd->sense_buffer &&
|
|
((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
|
|
(se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE)))
|
|
pending_req->result = SAM_STAT_CHECK_CONDITION;
|
|
else
|
|
pending_req->result = se_cmd->scsi_status;
|
|
|
|
scsiback_cmd_done(pending_req);
|
|
return 0;
|
|
}
|
|
|
|
static void scsiback_queue_tm_rsp(struct se_cmd *se_cmd)
|
|
{
|
|
struct vscsibk_pend *pending_req = container_of(se_cmd,
|
|
struct vscsibk_pend, se_cmd);
|
|
|
|
complete(&pending_req->tmr_done);
|
|
}
|
|
|
|
static void scsiback_aborted_task(struct se_cmd *se_cmd)
|
|
{
|
|
}
|
|
|
|
static ssize_t scsiback_tpg_param_alias_show(struct config_item *item,
|
|
char *page)
|
|
{
|
|
struct se_portal_group *se_tpg = param_to_tpg(item);
|
|
struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg,
|
|
se_tpg);
|
|
ssize_t rb;
|
|
|
|
mutex_lock(&tpg->tv_tpg_mutex);
|
|
rb = snprintf(page, PAGE_SIZE, "%s\n", tpg->param_alias);
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
|
|
return rb;
|
|
}
|
|
|
|
static ssize_t scsiback_tpg_param_alias_store(struct config_item *item,
|
|
const char *page, size_t count)
|
|
{
|
|
struct se_portal_group *se_tpg = param_to_tpg(item);
|
|
struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg,
|
|
se_tpg);
|
|
int len;
|
|
|
|
if (strlen(page) >= VSCSI_NAMELEN) {
|
|
pr_err("param alias: %s, exceeds max: %d\n", page,
|
|
VSCSI_NAMELEN);
|
|
return -EINVAL;
|
|
}
|
|
|
|
mutex_lock(&tpg->tv_tpg_mutex);
|
|
len = snprintf(tpg->param_alias, VSCSI_NAMELEN, "%s", page);
|
|
if (tpg->param_alias[len - 1] == '\n')
|
|
tpg->param_alias[len - 1] = '\0';
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
|
|
return count;
|
|
}
|
|
|
|
CONFIGFS_ATTR(scsiback_tpg_param_, alias);
|
|
|
|
static struct configfs_attribute *scsiback_param_attrs[] = {
|
|
&scsiback_tpg_param_attr_alias,
|
|
NULL,
|
|
};
|
|
|
|
static int scsiback_alloc_sess_cb(struct se_portal_group *se_tpg,
|
|
struct se_session *se_sess, void *p)
|
|
{
|
|
struct scsiback_tpg *tpg = container_of(se_tpg,
|
|
struct scsiback_tpg, se_tpg);
|
|
|
|
tpg->tpg_nexus = p;
|
|
return 0;
|
|
}
|
|
|
|
static int scsiback_make_nexus(struct scsiback_tpg *tpg,
|
|
const char *name)
|
|
{
|
|
struct scsiback_nexus *tv_nexus;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&tpg->tv_tpg_mutex);
|
|
if (tpg->tpg_nexus) {
|
|
pr_debug("tpg->tpg_nexus already exists\n");
|
|
ret = -EEXIST;
|
|
goto out_unlock;
|
|
}
|
|
|
|
tv_nexus = kzalloc(sizeof(struct scsiback_nexus), GFP_KERNEL);
|
|
if (!tv_nexus) {
|
|
ret = -ENOMEM;
|
|
goto out_unlock;
|
|
}
|
|
|
|
tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg,
|
|
VSCSI_DEFAULT_SESSION_TAGS,
|
|
sizeof(struct vscsibk_pend),
|
|
TARGET_PROT_NORMAL, name,
|
|
tv_nexus, scsiback_alloc_sess_cb);
|
|
if (IS_ERR(tv_nexus->tvn_se_sess)) {
|
|
kfree(tv_nexus);
|
|
ret = -ENOMEM;
|
|
goto out_unlock;
|
|
}
|
|
|
|
out_unlock:
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static int scsiback_drop_nexus(struct scsiback_tpg *tpg)
|
|
{
|
|
struct se_session *se_sess;
|
|
struct scsiback_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 xen-pvscsi I_T Nexus with active TPG port count: %d\n",
|
|
tpg->tv_tpg_port_count);
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (tpg->tv_tpg_fe_count != 0) {
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG frontend count: %d\n",
|
|
tpg->tv_tpg_fe_count);
|
|
return -EBUSY;
|
|
}
|
|
|
|
pr_debug("Removing I_T Nexus to emulated %s Initiator Port: %s\n",
|
|
scsiback_dump_proto_id(tpg->tport),
|
|
tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
|
|
|
|
/*
|
|
* Release the SCSI I_T Nexus to the emulated xen-pvscsi 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 scsiback_tpg_nexus_show(struct config_item *item, char *page)
|
|
{
|
|
struct se_portal_group *se_tpg = to_tpg(item);
|
|
struct scsiback_tpg *tpg = container_of(se_tpg,
|
|
struct scsiback_tpg, se_tpg);
|
|
struct scsiback_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 scsiback_tpg_nexus_store(struct config_item *item,
|
|
const char *page, size_t count)
|
|
{
|
|
struct se_portal_group *se_tpg = to_tpg(item);
|
|
struct scsiback_tpg *tpg = container_of(se_tpg,
|
|
struct scsiback_tpg, se_tpg);
|
|
struct scsiback_tport *tport_wwn = tpg->tport;
|
|
unsigned char i_port[VSCSI_NAMELEN], *ptr, *port_ptr;
|
|
int ret;
|
|
/*
|
|
* Shutdown the active I_T nexus if 'NULL' is passed.
|
|
*/
|
|
if (!strncmp(page, "NULL", 4)) {
|
|
ret = scsiback_drop_nexus(tpg);
|
|
return (!ret) ? count : ret;
|
|
}
|
|
/*
|
|
* Otherwise make sure the passed virtual Initiator port WWN matches
|
|
* the fabric protocol_id set in scsiback_make_tport(), and call
|
|
* scsiback_make_nexus().
|
|
*/
|
|
if (strlen(page) >= VSCSI_NAMELEN) {
|
|
pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n",
|
|
page, VSCSI_NAMELEN);
|
|
return -EINVAL;
|
|
}
|
|
snprintf(&i_port[0], VSCSI_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, scsiback_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, scsiback_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, scsiback_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 = scsiback_make_nexus(tpg, port_ptr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return count;
|
|
}
|
|
|
|
CONFIGFS_ATTR(scsiback_tpg_, nexus);
|
|
|
|
static struct configfs_attribute *scsiback_tpg_attrs[] = {
|
|
&scsiback_tpg_attr_nexus,
|
|
NULL,
|
|
};
|
|
|
|
static ssize_t
|
|
scsiback_wwn_version_show(struct config_item *item, char *page)
|
|
{
|
|
return sprintf(page, "xen-pvscsi fabric module %s on %s/%s on "
|
|
UTS_RELEASE"\n",
|
|
VSCSI_VERSION, utsname()->sysname, utsname()->machine);
|
|
}
|
|
|
|
CONFIGFS_ATTR_RO(scsiback_wwn_, version);
|
|
|
|
static struct configfs_attribute *scsiback_wwn_attrs[] = {
|
|
&scsiback_wwn_attr_version,
|
|
NULL,
|
|
};
|
|
|
|
static int scsiback_port_link(struct se_portal_group *se_tpg,
|
|
struct se_lun *lun)
|
|
{
|
|
struct scsiback_tpg *tpg = container_of(se_tpg,
|
|
struct scsiback_tpg, se_tpg);
|
|
|
|
mutex_lock(&tpg->tv_tpg_mutex);
|
|
tpg->tv_tpg_port_count++;
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void scsiback_port_unlink(struct se_portal_group *se_tpg,
|
|
struct se_lun *lun)
|
|
{
|
|
struct scsiback_tpg *tpg = container_of(se_tpg,
|
|
struct scsiback_tpg, se_tpg);
|
|
|
|
mutex_lock(&tpg->tv_tpg_mutex);
|
|
tpg->tv_tpg_port_count--;
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
}
|
|
|
|
static struct se_portal_group *
|
|
scsiback_make_tpg(struct se_wwn *wwn, const char *name)
|
|
{
|
|
struct scsiback_tport *tport = container_of(wwn,
|
|
struct scsiback_tport, tport_wwn);
|
|
|
|
struct scsiback_tpg *tpg;
|
|
u16 tpgt;
|
|
int ret;
|
|
|
|
if (strstr(name, "tpgt_") != name)
|
|
return ERR_PTR(-EINVAL);
|
|
ret = kstrtou16(name + 5, 10, &tpgt);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
tpg = kzalloc(sizeof(struct scsiback_tpg), GFP_KERNEL);
|
|
if (!tpg)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
mutex_init(&tpg->tv_tpg_mutex);
|
|
INIT_LIST_HEAD(&tpg->tv_tpg_list);
|
|
INIT_LIST_HEAD(&tpg->info_list);
|
|
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(&scsiback_mutex);
|
|
list_add_tail(&tpg->tv_tpg_list, &scsiback_list);
|
|
mutex_unlock(&scsiback_mutex);
|
|
|
|
return &tpg->se_tpg;
|
|
}
|
|
|
|
static void scsiback_drop_tpg(struct se_portal_group *se_tpg)
|
|
{
|
|
struct scsiback_tpg *tpg = container_of(se_tpg,
|
|
struct scsiback_tpg, se_tpg);
|
|
|
|
mutex_lock(&scsiback_mutex);
|
|
list_del(&tpg->tv_tpg_list);
|
|
mutex_unlock(&scsiback_mutex);
|
|
/*
|
|
* Release the virtual I_T Nexus for this xen-pvscsi TPG
|
|
*/
|
|
scsiback_drop_nexus(tpg);
|
|
/*
|
|
* Deregister the se_tpg from TCM.
|
|
*/
|
|
core_tpg_deregister(se_tpg);
|
|
kfree(tpg);
|
|
}
|
|
|
|
static int scsiback_check_true(struct se_portal_group *se_tpg)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int scsiback_check_false(struct se_portal_group *se_tpg)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static const struct target_core_fabric_ops scsiback_ops = {
|
|
.module = THIS_MODULE,
|
|
.fabric_name = "xen-pvscsi",
|
|
.tpg_get_wwn = scsiback_get_fabric_wwn,
|
|
.tpg_get_tag = scsiback_get_tag,
|
|
.tpg_check_demo_mode = scsiback_check_true,
|
|
.tpg_check_demo_mode_cache = scsiback_check_true,
|
|
.tpg_check_demo_mode_write_protect = scsiback_check_false,
|
|
.tpg_check_prod_mode_write_protect = scsiback_check_false,
|
|
.tpg_get_inst_index = scsiback_tpg_get_inst_index,
|
|
.check_stop_free = scsiback_check_stop_free,
|
|
.release_cmd = scsiback_release_cmd,
|
|
.sess_get_index = scsiback_sess_get_index,
|
|
.sess_get_initiator_sid = NULL,
|
|
.write_pending = scsiback_write_pending,
|
|
.set_default_node_attributes = scsiback_set_default_node_attrs,
|
|
.get_cmd_state = scsiback_get_cmd_state,
|
|
.queue_data_in = scsiback_queue_data_in,
|
|
.queue_status = scsiback_queue_status,
|
|
.queue_tm_rsp = scsiback_queue_tm_rsp,
|
|
.aborted_task = scsiback_aborted_task,
|
|
/*
|
|
* Setup callers for generic logic in target_core_fabric_configfs.c
|
|
*/
|
|
.fabric_make_wwn = scsiback_make_tport,
|
|
.fabric_drop_wwn = scsiback_drop_tport,
|
|
.fabric_make_tpg = scsiback_make_tpg,
|
|
.fabric_drop_tpg = scsiback_drop_tpg,
|
|
.fabric_post_link = scsiback_port_link,
|
|
.fabric_pre_unlink = scsiback_port_unlink,
|
|
|
|
.tfc_wwn_attrs = scsiback_wwn_attrs,
|
|
.tfc_tpg_base_attrs = scsiback_tpg_attrs,
|
|
.tfc_tpg_param_attrs = scsiback_param_attrs,
|
|
};
|
|
|
|
static const struct xenbus_device_id scsiback_ids[] = {
|
|
{ "vscsi" },
|
|
{ "" }
|
|
};
|
|
|
|
static struct xenbus_driver scsiback_driver = {
|
|
.ids = scsiback_ids,
|
|
.probe = scsiback_probe,
|
|
.remove = scsiback_remove,
|
|
.otherend_changed = scsiback_frontend_changed
|
|
};
|
|
|
|
static int __init scsiback_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (!xen_domain())
|
|
return -ENODEV;
|
|
|
|
pr_debug("xen-pvscsi: fabric module %s on %s/%s on "UTS_RELEASE"\n",
|
|
VSCSI_VERSION, utsname()->sysname, utsname()->machine);
|
|
|
|
ret = xenbus_register_backend(&scsiback_driver);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = target_register_template(&scsiback_ops);
|
|
if (ret)
|
|
goto out_unregister_xenbus;
|
|
|
|
return 0;
|
|
|
|
out_unregister_xenbus:
|
|
xenbus_unregister_driver(&scsiback_driver);
|
|
out:
|
|
pr_err("%s: error %d\n", __func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit scsiback_exit(void)
|
|
{
|
|
target_unregister_template(&scsiback_ops);
|
|
xenbus_unregister_driver(&scsiback_driver);
|
|
}
|
|
|
|
module_init(scsiback_init);
|
|
module_exit(scsiback_exit);
|
|
|
|
MODULE_DESCRIPTION("Xen SCSI backend driver");
|
|
MODULE_LICENSE("Dual BSD/GPL");
|
|
MODULE_ALIAS("xen-backend:vscsi");
|
|
MODULE_AUTHOR("Juergen Gross <jgross@suse.com>");
|