|
|
@@ -0,0 +1,2126 @@
|
|
|
+/*
|
|
|
+ * Xen SCSI backend driver
|
|
|
+ *
|
|
|
+ * Copyright (c) 2008, FUJITSU Limited
|
|
|
+ *
|
|
|
+ * Based on the blkback driver code.
|
|
|
+ * Adaption to kernel taget core infrastructure taken from vhost/scsi.c
|
|
|
+ *
|
|
|
+ * This program is free software; you can redistribute it and/or
|
|
|
+ * modify it under the terms of the GNU General Public License version 2
|
|
|
+ * as published by the Free Software Foundation; or, when distributed
|
|
|
+ * separately from the Linux kernel or incorporated into other
|
|
|
+ * software packages, subject to the following license:
|
|
|
+ *
|
|
|
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
|
+ * of this source file (the "Software"), to deal in the Software without
|
|
|
+ * restriction, including without limitation the rights to use, copy, modify,
|
|
|
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
|
|
|
+ * and to permit persons to whom the Software is furnished to do so, subject to
|
|
|
+ * the following conditions:
|
|
|
+ *
|
|
|
+ * The above copyright notice and this permission notice shall be included in
|
|
|
+ * all copies or substantial portions of the Software.
|
|
|
+ *
|
|
|
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
|
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
|
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
|
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
|
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
|
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
|
+ * IN THE SOFTWARE.
|
|
|
+ */
|
|
|
+
|
|
|
+#include <stdarg.h>
|
|
|
+
|
|
|
+#include <linux/module.h>
|
|
|
+#include <linux/utsname.h>
|
|
|
+#include <linux/interrupt.h>
|
|
|
+#include <linux/slab.h>
|
|
|
+#include <linux/wait.h>
|
|
|
+#include <linux/sched.h>
|
|
|
+#include <linux/list.h>
|
|
|
+#include <linux/gfp.h>
|
|
|
+#include <linux/delay.h>
|
|
|
+#include <linux/spinlock.h>
|
|
|
+#include <linux/configfs.h>
|
|
|
+
|
|
|
+#include <generated/utsrelease.h>
|
|
|
+
|
|
|
+#include <scsi/scsi_dbg.h>
|
|
|
+#include <scsi/scsi_eh.h>
|
|
|
+#include <scsi/scsi_tcq.h>
|
|
|
+
|
|
|
+#include <target/target_core_base.h>
|
|
|
+#include <target/target_core_fabric.h>
|
|
|
+#include <target/target_core_configfs.h>
|
|
|
+#include <target/target_core_fabric_configfs.h>
|
|
|
+
|
|
|
+#include <asm/hypervisor.h>
|
|
|
+
|
|
|
+#include <xen/xen.h>
|
|
|
+#include <xen/balloon.h>
|
|
|
+#include <xen/events.h>
|
|
|
+#include <xen/xenbus.h>
|
|
|
+#include <xen/grant_table.h>
|
|
|
+#include <xen/page.h>
|
|
|
+
|
|
|
+#include <xen/interface/grant_table.h>
|
|
|
+#include <xen/interface/io/vscsiif.h>
|
|
|
+
|
|
|
+#define DPRINTK(_f, _a...) \
|
|
|
+ pr_debug("(file=%s, line=%d) " _f, __FILE__ , __LINE__ , ## _a)
|
|
|
+
|
|
|
+#define VSCSI_VERSION "v0.1"
|
|
|
+#define VSCSI_NAMELEN 32
|
|
|
+
|
|
|
+struct ids_tuple {
|
|
|
+ unsigned int hst; /* host */
|
|
|
+ unsigned int chn; /* channel */
|
|
|
+ unsigned int tgt; /* target */
|
|
|
+ unsigned int lun; /* LUN */
|
|
|
+};
|
|
|
+
|
|
|
+struct v2p_entry {
|
|
|
+ struct ids_tuple v; /* translate from */
|
|
|
+ struct scsiback_tpg *tpg; /* translate to */
|
|
|
+ unsigned int lun;
|
|
|
+ struct kref kref;
|
|
|
+ struct list_head l;
|
|
|
+};
|
|
|
+
|
|
|
+struct vscsibk_info {
|
|
|
+ struct xenbus_device *dev;
|
|
|
+
|
|
|
+ domid_t domid;
|
|
|
+ unsigned int irq;
|
|
|
+
|
|
|
+ struct vscsiif_back_ring ring;
|
|
|
+ int ring_error;
|
|
|
+
|
|
|
+ spinlock_t ring_lock;
|
|
|
+ atomic_t nr_unreplied_reqs;
|
|
|
+
|
|
|
+ spinlock_t v2p_lock;
|
|
|
+ struct list_head v2p_entry_lists;
|
|
|
+
|
|
|
+ wait_queue_head_t waiting_to_free;
|
|
|
+};
|
|
|
+
|
|
|
+/* theoretical maximum of grants for one request */
|
|
|
+#define VSCSI_MAX_GRANTS (SG_ALL + VSCSIIF_SG_TABLESIZE)
|
|
|
+
|
|
|
+/*
|
|
|
+ * VSCSI_GRANT_BATCH is the maximum number of grants to be processed in one
|
|
|
+ * call to map/unmap grants. Don't choose it too large, as there are arrays
|
|
|
+ * with VSCSI_GRANT_BATCH elements allocated on the stack.
|
|
|
+ */
|
|
|
+#define VSCSI_GRANT_BATCH 16
|
|
|
+
|
|
|
+struct vscsibk_pend {
|
|
|
+ uint16_t rqid;
|
|
|
+
|
|
|
+ uint8_t cmnd[VSCSIIF_MAX_COMMAND_SIZE];
|
|
|
+ uint8_t cmd_len;
|
|
|
+
|
|
|
+ uint8_t sc_data_direction;
|
|
|
+ uint16_t n_sg; /* real length of SG list */
|
|
|
+ uint16_t n_grants; /* SG pages and potentially SG list */
|
|
|
+ uint32_t data_len;
|
|
|
+ uint32_t result;
|
|
|
+
|
|
|
+ struct vscsibk_info *info;
|
|
|
+ struct v2p_entry *v2p;
|
|
|
+ struct scatterlist *sgl;
|
|
|
+
|
|
|
+ uint8_t sense_buffer[VSCSIIF_SENSE_BUFFERSIZE];
|
|
|
+
|
|
|
+ grant_handle_t grant_handles[VSCSI_MAX_GRANTS];
|
|
|
+ struct page *pages[VSCSI_MAX_GRANTS];
|
|
|
+
|
|
|
+ struct se_cmd se_cmd;
|
|
|
+};
|
|
|
+
|
|
|
+struct scsiback_tmr {
|
|
|
+ atomic_t tmr_complete;
|
|
|
+ wait_queue_head_t tmr_wait;
|
|
|
+};
|
|
|
+
|
|
|
+struct scsiback_nexus {
|
|
|
+ /* Pointer to TCM session for I_T Nexus */
|
|
|
+ struct se_session *tvn_se_sess;
|
|
|
+};
|
|
|
+
|
|
|
+struct scsiback_tport {
|
|
|
+ /* SCSI protocol the tport is providing */
|
|
|
+ u8 tport_proto_id;
|
|
|
+ /* Binary World Wide unique Port Name for pvscsi Target port */
|
|
|
+ u64 tport_wwpn;
|
|
|
+ /* ASCII formatted WWPN for pvscsi Target port */
|
|
|
+ char tport_name[VSCSI_NAMELEN];
|
|
|
+ /* Returned by scsiback_make_tport() */
|
|
|
+ struct se_wwn tport_wwn;
|
|
|
+};
|
|
|
+
|
|
|
+struct scsiback_tpg {
|
|
|
+ /* scsiback port target portal group tag for TCM */
|
|
|
+ u16 tport_tpgt;
|
|
|
+ /* track number of TPG Port/Lun Links wrt explicit I_T Nexus shutdown */
|
|
|
+ int tv_tpg_port_count;
|
|
|
+ /* xen-pvscsi references to tpg_nexus, protected by tv_tpg_mutex */
|
|
|
+ int tv_tpg_fe_count;
|
|
|
+ /* list for scsiback_list */
|
|
|
+ struct list_head tv_tpg_list;
|
|
|
+ /* Used to protect access for tpg_nexus */
|
|
|
+ struct mutex tv_tpg_mutex;
|
|
|
+ /* Pointer to the TCM pvscsi I_T Nexus for this TPG endpoint */
|
|
|
+ struct scsiback_nexus *tpg_nexus;
|
|
|
+ /* Pointer back to scsiback_tport */
|
|
|
+ struct scsiback_tport *tport;
|
|
|
+ /* Returned by scsiback_make_tpg() */
|
|
|
+ struct se_portal_group se_tpg;
|
|
|
+ /* alias used in xenstore */
|
|
|
+ char param_alias[VSCSI_NAMELEN];
|
|
|
+ /* list of info structures related to this target portal group */
|
|
|
+ struct list_head info_list;
|
|
|
+};
|
|
|
+
|
|
|
+#define SCSIBACK_INVALID_HANDLE (~0)
|
|
|
+
|
|
|
+static bool log_print_stat;
|
|
|
+module_param(log_print_stat, bool, 0644);
|
|
|
+
|
|
|
+static int scsiback_max_buffer_pages = 1024;
|
|
|
+module_param_named(max_buffer_pages, scsiback_max_buffer_pages, int, 0644);
|
|
|
+MODULE_PARM_DESC(max_buffer_pages,
|
|
|
+"Maximum number of free pages to keep in backend buffer");
|
|
|
+
|
|
|
+static struct kmem_cache *scsiback_cachep;
|
|
|
+static DEFINE_SPINLOCK(free_pages_lock);
|
|
|
+static int free_pages_num;
|
|
|
+static LIST_HEAD(scsiback_free_pages);
|
|
|
+
|
|
|
+/* Global spinlock to protect scsiback TPG list */
|
|
|
+static DEFINE_MUTEX(scsiback_mutex);
|
|
|
+static LIST_HEAD(scsiback_list);
|
|
|
+
|
|
|
+/* Local pointer to allocated TCM configfs fabric module */
|
|
|
+static struct target_fabric_configfs *scsiback_fabric_configfs;
|
|
|
+
|
|
|
+static void scsiback_get(struct vscsibk_info *info)
|
|
|
+{
|
|
|
+ atomic_inc(&info->nr_unreplied_reqs);
|
|
|
+}
|
|
|
+
|
|
|
+static void scsiback_put(struct vscsibk_info *info)
|
|
|
+{
|
|
|
+ if (atomic_dec_and_test(&info->nr_unreplied_reqs))
|
|
|
+ wake_up(&info->waiting_to_free);
|
|
|
+}
|
|
|
+
|
|
|
+static void put_free_pages(struct page **page, int num)
|
|
|
+{
|
|
|
+ unsigned long flags;
|
|
|
+ int i = free_pages_num + num, n = num;
|
|
|
+
|
|
|
+ if (num == 0)
|
|
|
+ return;
|
|
|
+ if (i > scsiback_max_buffer_pages) {
|
|
|
+ n = min(num, i - scsiback_max_buffer_pages);
|
|
|
+ free_xenballooned_pages(n, page + num - n);
|
|
|
+ n = num - n;
|
|
|
+ }
|
|
|
+ spin_lock_irqsave(&free_pages_lock, flags);
|
|
|
+ for (i = 0; i < n; i++)
|
|
|
+ list_add(&page[i]->lru, &scsiback_free_pages);
|
|
|
+ free_pages_num += n;
|
|
|
+ spin_unlock_irqrestore(&free_pages_lock, flags);
|
|
|
+}
|
|
|
+
|
|
|
+static int get_free_page(struct page **page)
|
|
|
+{
|
|
|
+ unsigned long flags;
|
|
|
+
|
|
|
+ spin_lock_irqsave(&free_pages_lock, flags);
|
|
|
+ if (list_empty(&scsiback_free_pages)) {
|
|
|
+ spin_unlock_irqrestore(&free_pages_lock, flags);
|
|
|
+ return alloc_xenballooned_pages(1, page, false);
|
|
|
+ }
|
|
|
+ page[0] = list_first_entry(&scsiback_free_pages, struct page, lru);
|
|
|
+ list_del(&page[0]->lru);
|
|
|
+ free_pages_num--;
|
|
|
+ spin_unlock_irqrestore(&free_pages_lock, flags);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static unsigned long vaddr_page(struct page *page)
|
|
|
+{
|
|
|
+ unsigned long pfn = page_to_pfn(page);
|
|
|
+
|
|
|
+ return (unsigned long)pfn_to_kaddr(pfn);
|
|
|
+}
|
|
|
+
|
|
|
+static unsigned long vaddr(struct vscsibk_pend *req, int seg)
|
|
|
+{
|
|
|
+ return vaddr_page(req->pages[seg]);
|
|
|
+}
|
|
|
+
|
|
|
+static void scsiback_print_status(char *sense_buffer, int errors,
|
|
|
+ struct vscsibk_pend *pending_req)
|
|
|
+{
|
|
|
+ struct scsiback_tpg *tpg = pending_req->v2p->tpg;
|
|
|
+
|
|
|
+ pr_err("xen-pvscsi[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n",
|
|
|
+ tpg->tport->tport_name, pending_req->v2p->lun,
|
|
|
+ pending_req->cmnd[0], status_byte(errors), msg_byte(errors),
|
|
|
+ host_byte(errors), driver_byte(errors));
|
|
|
+
|
|
|
+ if (CHECK_CONDITION & status_byte(errors))
|
|
|
+ __scsi_print_sense("xen-pvscsi", sense_buffer,
|
|
|
+ SCSI_SENSE_BUFFERSIZE);
|
|
|
+}
|
|
|
+
|
|
|
+static void scsiback_fast_flush_area(struct vscsibk_pend *req)
|
|
|
+{
|
|
|
+ struct gnttab_unmap_grant_ref unmap[VSCSI_GRANT_BATCH];
|
|
|
+ struct page *pages[VSCSI_GRANT_BATCH];
|
|
|
+ unsigned int i, invcount = 0;
|
|
|
+ grant_handle_t handle;
|
|
|
+ int err;
|
|
|
+
|
|
|
+ kfree(req->sgl);
|
|
|
+ req->sgl = NULL;
|
|
|
+ req->n_sg = 0;
|
|
|
+
|
|
|
+ if (!req->n_grants)
|
|
|
+ return;
|
|
|
+
|
|
|
+ for (i = 0; i < req->n_grants; i++) {
|
|
|
+ handle = req->grant_handles[i];
|
|
|
+ if (handle == SCSIBACK_INVALID_HANDLE)
|
|
|
+ continue;
|
|
|
+ gnttab_set_unmap_op(&unmap[invcount], vaddr(req, i),
|
|
|
+ GNTMAP_host_map, handle);
|
|
|
+ req->grant_handles[i] = SCSIBACK_INVALID_HANDLE;
|
|
|
+ pages[invcount] = req->pages[i];
|
|
|
+ put_page(pages[invcount]);
|
|
|
+ invcount++;
|
|
|
+ if (invcount < VSCSI_GRANT_BATCH)
|
|
|
+ continue;
|
|
|
+ err = gnttab_unmap_refs(unmap, NULL, pages, invcount);
|
|
|
+ BUG_ON(err);
|
|
|
+ invcount = 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (invcount) {
|
|
|
+ err = gnttab_unmap_refs(unmap, NULL, pages, invcount);
|
|
|
+ BUG_ON(err);
|
|
|
+ }
|
|
|
+
|
|
|
+ put_free_pages(req->pages, req->n_grants);
|
|
|
+ req->n_grants = 0;
|
|
|
+}
|
|
|
+
|
|
|
+static void scsiback_free_translation_entry(struct kref *kref)
|
|
|
+{
|
|
|
+ struct v2p_entry *entry = container_of(kref, struct v2p_entry, kref);
|
|
|
+ struct scsiback_tpg *tpg = entry->tpg;
|
|
|
+
|
|
|
+ mutex_lock(&tpg->tv_tpg_mutex);
|
|
|
+ tpg->tv_tpg_fe_count--;
|
|
|
+ mutex_unlock(&tpg->tv_tpg_mutex);
|
|
|
+
|
|
|
+ kfree(entry);
|
|
|
+}
|
|
|
+
|
|
|
+static void scsiback_do_resp_with_sense(char *sense_buffer, int32_t result,
|
|
|
+ uint32_t resid, struct vscsibk_pend *pending_req)
|
|
|
+{
|
|
|
+ struct vscsiif_response *ring_res;
|
|
|
+ struct vscsibk_info *info = pending_req->info;
|
|
|
+ int notify;
|
|
|
+ struct scsi_sense_hdr sshdr;
|
|
|
+ unsigned long flags;
|
|
|
+ unsigned len;
|
|
|
+
|
|
|
+ spin_lock_irqsave(&info->ring_lock, flags);
|
|
|
+
|
|
|
+ ring_res = RING_GET_RESPONSE(&info->ring, info->ring.rsp_prod_pvt);
|
|
|
+ info->ring.rsp_prod_pvt++;
|
|
|
+
|
|
|
+ ring_res->rslt = result;
|
|
|
+ ring_res->rqid = pending_req->rqid;
|
|
|
+
|
|
|
+ if (sense_buffer != NULL &&
|
|
|
+ scsi_normalize_sense(sense_buffer, VSCSIIF_SENSE_BUFFERSIZE,
|
|
|
+ &sshdr)) {
|
|
|
+ len = min_t(unsigned, 8 + sense_buffer[7],
|
|
|
+ VSCSIIF_SENSE_BUFFERSIZE);
|
|
|
+ memcpy(ring_res->sense_buffer, sense_buffer, len);
|
|
|
+ ring_res->sense_len = len;
|
|
|
+ } else {
|
|
|
+ ring_res->sense_len = 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ ring_res->residual_len = resid;
|
|
|
+
|
|
|
+ RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&info->ring, notify);
|
|
|
+ spin_unlock_irqrestore(&info->ring_lock, flags);
|
|
|
+
|
|
|
+ if (notify)
|
|
|
+ notify_remote_via_irq(info->irq);
|
|
|
+
|
|
|
+ if (pending_req->v2p)
|
|
|
+ kref_put(&pending_req->v2p->kref,
|
|
|
+ scsiback_free_translation_entry);
|
|
|
+}
|
|
|
+
|
|
|
+static void scsiback_cmd_done(struct vscsibk_pend *pending_req)
|
|
|
+{
|
|
|
+ struct vscsibk_info *info = pending_req->info;
|
|
|
+ unsigned char *sense_buffer;
|
|
|
+ unsigned int resid;
|
|
|
+ int errors;
|
|
|
+
|
|
|
+ sense_buffer = pending_req->sense_buffer;
|
|
|
+ resid = pending_req->se_cmd.residual_count;
|
|
|
+ errors = pending_req->result;
|
|
|
+
|
|
|
+ if (errors && log_print_stat)
|
|
|
+ scsiback_print_status(sense_buffer, errors, pending_req);
|
|
|
+
|
|
|
+ scsiback_fast_flush_area(pending_req);
|
|
|
+ scsiback_do_resp_with_sense(sense_buffer, errors, resid, pending_req);
|
|
|
+ scsiback_put(info);
|
|
|
+}
|
|
|
+
|
|
|
+static void scsiback_cmd_exec(struct vscsibk_pend *pending_req)
|
|
|
+{
|
|
|
+ struct se_cmd *se_cmd = &pending_req->se_cmd;
|
|
|
+ struct se_session *sess = pending_req->v2p->tpg->tpg_nexus->tvn_se_sess;
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ memset(pending_req->sense_buffer, 0, VSCSIIF_SENSE_BUFFERSIZE);
|
|
|
+
|
|
|
+ memset(se_cmd, 0, sizeof(*se_cmd));
|
|
|
+
|
|
|
+ scsiback_get(pending_req->info);
|
|
|
+ rc = target_submit_cmd_map_sgls(se_cmd, sess, pending_req->cmnd,
|
|
|
+ pending_req->sense_buffer, pending_req->v2p->lun,
|
|
|
+ pending_req->data_len, 0,
|
|
|
+ pending_req->sc_data_direction, 0,
|
|
|
+ pending_req->sgl, pending_req->n_sg,
|
|
|
+ NULL, 0, NULL, 0);
|
|
|
+ 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 int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map,
|
|
|
+ struct page **pg, grant_handle_t *grant, int cnt)
|
|
|
+{
|
|
|
+ int err, i;
|
|
|
+
|
|
|
+ if (!cnt)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ err = gnttab_map_refs(map, NULL, pg, cnt);
|
|
|
+ BUG_ON(err);
|
|
|
+ for (i = 0; i < cnt; i++) {
|
|
|
+ if (unlikely(map[i].status != GNTST_okay)) {
|
|
|
+ pr_err("xen-pvscsi: invalid buffer -- could not remap it\n");
|
|
|
+ map[i].handle = SCSIBACK_INVALID_HANDLE;
|
|
|
+ err = -ENOMEM;
|
|
|
+ } else {
|
|
|
+ get_page(pg[i]);
|
|
|
+ }
|
|
|
+ grant[i] = map[i].handle;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+static int scsiback_gnttab_data_map_list(struct vscsibk_pend *pending_req,
|
|
|
+ struct scsiif_request_segment *seg, struct page **pg,
|
|
|
+ grant_handle_t *grant, int cnt, u32 flags)
|
|
|
+{
|
|
|
+ int mapcount = 0, i, err = 0;
|
|
|
+ struct gnttab_map_grant_ref map[VSCSI_GRANT_BATCH];
|
|
|
+ struct vscsibk_info *info = pending_req->info;
|
|
|
+
|
|
|
+ for (i = 0; i < cnt; i++) {
|
|
|
+ if (get_free_page(pg + mapcount)) {
|
|
|
+ put_free_pages(pg, mapcount);
|
|
|
+ pr_err("xen-pvscsi: no grant page\n");
|
|
|
+ return -ENOMEM;
|
|
|
+ }
|
|
|
+ gnttab_set_map_op(&map[mapcount], vaddr_page(pg[mapcount]),
|
|
|
+ flags, seg[i].gref, info->domid);
|
|
|
+ mapcount++;
|
|
|
+ if (mapcount < VSCSI_GRANT_BATCH)
|
|
|
+ continue;
|
|
|
+ err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount);
|
|
|
+ pg += mapcount;
|
|
|
+ grant += mapcount;
|
|
|
+ pending_req->n_grants += mapcount;
|
|
|
+ if (err)
|
|
|
+ return err;
|
|
|
+ mapcount = 0;
|
|
|
+ }
|
|
|
+ err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount);
|
|
|
+ pending_req->n_grants += mapcount;
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req,
|
|
|
+ struct vscsibk_pend *pending_req)
|
|
|
+{
|
|
|
+ u32 flags;
|
|
|
+ int i, err, n_segs, i_seg = 0;
|
|
|
+ struct page **pg;
|
|
|
+ struct scsiif_request_segment *seg;
|
|
|
+ unsigned long end_seg = 0;
|
|
|
+ unsigned int nr_segments = (unsigned int)ring_req->nr_segments;
|
|
|
+ unsigned int nr_sgl = 0;
|
|
|
+ struct scatterlist *sg;
|
|
|
+ grant_handle_t *grant;
|
|
|
+
|
|
|
+ pending_req->n_sg = 0;
|
|
|
+ pending_req->n_grants = 0;
|
|
|
+ pending_req->data_len = 0;
|
|
|
+
|
|
|
+ nr_segments &= ~VSCSIIF_SG_GRANT;
|
|
|
+ if (!nr_segments)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ if (nr_segments > VSCSIIF_SG_TABLESIZE) {
|
|
|
+ DPRINTK("xen-pvscsi: invalid parameter nr_seg = %d\n",
|
|
|
+ ring_req->nr_segments);
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (ring_req->nr_segments & VSCSIIF_SG_GRANT) {
|
|
|
+ err = scsiback_gnttab_data_map_list(pending_req, ring_req->seg,
|
|
|
+ pending_req->pages, pending_req->grant_handles,
|
|
|
+ nr_segments, GNTMAP_host_map | GNTMAP_readonly);
|
|
|
+ if (err)
|
|
|
+ return err;
|
|
|
+ nr_sgl = nr_segments;
|
|
|
+ nr_segments = 0;
|
|
|
+ for (i = 0; i < nr_sgl; i++) {
|
|
|
+ n_segs = ring_req->seg[i].length /
|
|
|
+ sizeof(struct scsiif_request_segment);
|
|
|
+ if ((unsigned)ring_req->seg[i].offset +
|
|
|
+ (unsigned)ring_req->seg[i].length > PAGE_SIZE ||
|
|
|
+ n_segs * sizeof(struct scsiif_request_segment) !=
|
|
|
+ ring_req->seg[i].length)
|
|
|
+ return -EINVAL;
|
|
|
+ nr_segments += n_segs;
|
|
|
+ }
|
|
|
+ if (nr_segments > SG_ALL) {
|
|
|
+ DPRINTK("xen-pvscsi: 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)
|
|
|
+{
|
|
|
+ int rc, err = FAILED;
|
|
|
+ struct scsiback_tpg *tpg = pending_req->v2p->tpg;
|
|
|
+ struct se_cmd *se_cmd = &pending_req->se_cmd;
|
|
|
+ struct scsiback_tmr *tmr;
|
|
|
+
|
|
|
+ tmr = kzalloc(sizeof(struct scsiback_tmr), GFP_KERNEL);
|
|
|
+ if (!tmr)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ init_waitqueue_head(&tmr->tmr_wait);
|
|
|
+
|
|
|
+ transport_init_se_cmd(se_cmd, tpg->se_tpg.se_tpg_tfo,
|
|
|
+ tpg->tpg_nexus->tvn_se_sess, 0, DMA_NONE, MSG_SIMPLE_TAG,
|
|
|
+ &pending_req->sense_buffer[0]);
|
|
|
+
|
|
|
+ rc = core_tmr_alloc_req(se_cmd, tmr, act, GFP_KERNEL);
|
|
|
+ if (rc < 0)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ se_cmd->se_tmr_req->ref_task_tag = tag;
|
|
|
+
|
|
|
+ if (transport_lookup_tmr_lun(se_cmd, pending_req->v2p->lun) < 0)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ transport_generic_handle_tmr(se_cmd);
|
|
|
+ wait_event(tmr->tmr_wait, atomic_read(&tmr->tmr_complete));
|
|
|
+
|
|
|
+ err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ?
|
|
|
+ SUCCESS : FAILED;
|
|
|
+
|
|
|
+out:
|
|
|
+ if (tmr) {
|
|
|
+ transport_generic_free_cmd(&pending_req->se_cmd, 1);
|
|
|
+ kfree(tmr);
|
|
|
+ }
|
|
|
+
|
|
|
+ scsiback_do_resp_with_sense(NULL, err, 0, pending_req);
|
|
|
+
|
|
|
+ kmem_cache_free(scsiback_cachep, 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 int prepare_pending_reqs(struct vscsibk_info *info,
|
|
|
+ struct vscsiif_request *ring_req,
|
|
|
+ struct vscsibk_pend *pending_req)
|
|
|
+{
|
|
|
+ struct v2p_entry *v2p;
|
|
|
+ struct ids_tuple vir;
|
|
|
+
|
|
|
+ pending_req->rqid = ring_req->rqid;
|
|
|
+ pending_req->info = info;
|
|
|
+
|
|
|
+ vir.chn = ring_req->channel;
|
|
|
+ vir.tgt = ring_req->id;
|
|
|
+ vir.lun = ring_req->lun;
|
|
|
+
|
|
|
+ v2p = scsiback_do_translation(info, &vir);
|
|
|
+ if (!v2p) {
|
|
|
+ pending_req->v2p = NULL;
|
|
|
+ DPRINTK("xen-pvscsi: doesn't exist.\n");
|
|
|
+ return -ENODEV;
|
|
|
+ }
|
|
|
+ pending_req->v2p = v2p;
|
|
|
+
|
|
|
+ /* request range check from frontend */
|
|
|
+ pending_req->sc_data_direction = ring_req->sc_data_direction;
|
|
|
+ if ((pending_req->sc_data_direction != DMA_BIDIRECTIONAL) &&
|
|
|
+ (pending_req->sc_data_direction != DMA_TO_DEVICE) &&
|
|
|
+ (pending_req->sc_data_direction != DMA_FROM_DEVICE) &&
|
|
|
+ (pending_req->sc_data_direction != DMA_NONE)) {
|
|
|
+ DPRINTK("xen-pvscsi: invalid parameter data_dir = %d\n",
|
|
|
+ pending_req->sc_data_direction);
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ pending_req->cmd_len = ring_req->cmd_len;
|
|
|
+ if (pending_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) {
|
|
|
+ DPRINTK("xen-pvscsi: invalid parameter cmd_len = %d\n",
|
|
|
+ pending_req->cmd_len);
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+ memcpy(pending_req->cmnd, ring_req->cmnd, pending_req->cmd_len);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int scsiback_do_cmd_fn(struct vscsibk_info *info)
|
|
|
+{
|
|
|
+ struct vscsiif_back_ring *ring = &info->ring;
|
|
|
+ struct vscsiif_request *ring_req;
|
|
|
+ struct vscsibk_pend *pending_req;
|
|
|
+ RING_IDX rc, rp;
|
|
|
+ int err, more_to_do;
|
|
|
+ uint32_t result;
|
|
|
+ uint8_t act;
|
|
|
+
|
|
|
+ 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("xen-pvscsi: Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n",
|
|
|
+ info->domid, rp, rc, rp - rc);
|
|
|
+ info->ring_error = 1;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ while ((rc != rp)) {
|
|
|
+ if (RING_REQUEST_CONS_OVERFLOW(ring, rc))
|
|
|
+ break;
|
|
|
+ pending_req = kmem_cache_alloc(scsiback_cachep, GFP_KERNEL);
|
|
|
+ if (!pending_req)
|
|
|
+ return 1;
|
|
|
+
|
|
|
+ ring_req = RING_GET_REQUEST(ring, rc);
|
|
|
+ ring->req_cons = ++rc;
|
|
|
+
|
|
|
+ act = ring_req->act;
|
|
|
+ err = prepare_pending_reqs(info, ring_req, pending_req);
|
|
|
+ if (err) {
|
|
|
+ switch (err) {
|
|
|
+ case -ENODEV:
|
|
|
+ result = DID_NO_CONNECT;
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ result = DRIVER_ERROR;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ scsiback_do_resp_with_sense(NULL, result << 24, 0,
|
|
|
+ pending_req);
|
|
|
+ kmem_cache_free(scsiback_cachep, pending_req);
|
|
|
+ return 1;
|
|
|
+ }
|
|
|
+
|
|
|
+ switch (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,
|
|
|
+ DRIVER_ERROR << 24, 0, pending_req);
|
|
|
+ kmem_cache_free(scsiback_cachep, pending_req);
|
|
|
+ } 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("xen-pvscsi: invalid request\n");
|
|
|
+ scsiback_do_resp_with_sense(NULL, DRIVER_ERROR << 24,
|
|
|
+ 0, pending_req);
|
|
|
+ kmem_cache_free(scsiback_cachep, pending_req);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Yield point for this unbounded loop. */
|
|
|
+ cond_resched();
|
|
|
+ }
|
|
|
+
|
|
|
+ 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;
|
|
|
+
|
|
|
+ if (info->ring_error)
|
|
|
+ return IRQ_HANDLED;
|
|
|
+
|
|
|
+ while (scsiback_do_cmd_fn(info))
|
|
|
+ cond_resched();
|
|
|
+
|
|
|
+ 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, &area);
|
|
|
+ if (err)
|
|
|
+ return err;
|
|
|
+
|
|
|
+ sring = (struct vscsiif_sring *)area;
|
|
|
+ BACK_RING_INIT(&info->ring, sring, PAGE_SIZE);
|
|
|
+
|
|
|
+ err = bind_interdomain_evtchn_to_irq(info->domid, 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;
|
|
|
+ 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);
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ 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 *entry;
|
|
|
+ struct v2p_entry *new;
|
|
|
+ struct list_head *head = &(info->v2p_entry_lists);
|
|
|
+ unsigned long flags;
|
|
|
+ char *lunp;
|
|
|
+ unsigned int lun;
|
|
|
+ struct scsiback_tpg *tpg_entry, *tpg = NULL;
|
|
|
+ char *error = "doesn't exist";
|
|
|
+
|
|
|
+ lunp = strrchr(phy, ':');
|
|
|
+ if (!lunp) {
|
|
|
+ pr_err("xen-pvscsi: illegal format of physical device %s\n",
|
|
|
+ phy);
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+ *lunp = 0;
|
|
|
+ lunp++;
|
|
|
+ if (kstrtouint(lunp, 10, &lun) || lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
|
|
|
+ pr_err("xen-pvscsi: lun number not valid: %s\n", lunp);
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ 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)) {
|
|
|
+ spin_lock(&tpg_entry->se_tpg.tpg_lun_lock);
|
|
|
+ if (tpg_entry->se_tpg.tpg_lun_list[lun]->lun_status ==
|
|
|
+ TRANSPORT_LUN_STATUS_ACTIVE) {
|
|
|
+ if (!tpg_entry->tpg_nexus)
|
|
|
+ error = "nexus undefined";
|
|
|
+ else
|
|
|
+ tpg = tpg_entry;
|
|
|
+ }
|
|
|
+ spin_unlock(&tpg_entry->se_tpg.tpg_lun_lock);
|
|
|
+ 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("xen-pvscsi: %s:%d %s\n", phy, 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 */
|
|
|
+ list_for_each_entry(entry, head, l) {
|
|
|
+ if ((entry->v.chn == v->chn) &&
|
|
|
+ (entry->v.tgt == v->tgt) &&
|
|
|
+ (entry->v.lun == v->lun)) {
|
|
|
+ pr_warn("xen-pvscsi: 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 = lun;
|
|
|
+ list_add_tail(&new->l, head);
|
|
|
+
|
|
|
+out:
|
|
|
+ spin_unlock_irqrestore(&info->v2p_lock, flags);
|
|
|
+
|
|
|
+out_free:
|
|
|
+ mutex_lock(&tpg->tv_tpg_mutex);
|
|
|
+ tpg->tv_tpg_fe_count--;
|
|
|
+ mutex_unlock(&tpg->tv_tpg_mutex);
|
|
|
+
|
|
|
+ if (err)
|
|
|
+ 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 specfied
|
|
|
+*/
|
|
|
+static int scsiback_del_translation_entry(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);
|
|
|
+ /* Find out the translation entry specified */
|
|
|
+ list_for_each_entry(entry, head, l) {
|
|
|
+ if ((entry->v.chn == v->chn) &&
|
|
|
+ (entry->v.tgt == v->tgt) &&
|
|
|
+ (entry->v.lun == v->lun)) {
|
|
|
+ goto found;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ spin_unlock_irqrestore(&info->v2p_lock, flags);
|
|
|
+ return 1;
|
|
|
+
|
|
|
+found:
|
|
|
+ /* Delete the translation entry specfied */
|
|
|
+ __scsiback_del_translation_entry(entry);
|
|
|
+
|
|
|
+ spin_unlock_irqrestore(&info->v2p_lock, flags);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state,
|
|
|
+ char *phy, struct ids_tuple *vir)
|
|
|
+{
|
|
|
+ if (!scsiback_add_translation_entry(info, phy, vir)) {
|
|
|
+ if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
|
|
|
+ "%d", XenbusStateInitialised)) {
|
|
|
+ pr_err("xen-pvscsi: xenbus_printf error %s\n", state);
|
|
|
+ scsiback_del_translation_entry(info, vir);
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ xenbus_printf(XBT_NIL, info->dev->nodename, state,
|
|
|
+ "%d", XenbusStateClosed);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+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("xen-pvscsi: 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)) {
|
|
|
+ xenbus_printf(XBT_NIL, dev->nodename, state,
|
|
|
+ "%d", XenbusStateClosed);
|
|
|
+ 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)) {
|
|
|
+ xenbus_printf(XBT_NIL, dev->nodename, state,
|
|
|
+ "%d", XenbusStateClosed);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ switch (op) {
|
|
|
+ case VSCSIBACK_OP_ADD_OR_DEL_LUN:
|
|
|
+ if (device_state == XenbusStateInitialising)
|
|
|
+ scsiback_do_add_lun(info, state, phy, &vir);
|
|
|
+ if (device_state == XenbusStateClosing)
|
|
|
+ scsiback_do_del_lun(info, state, &vir);
|
|
|
+ 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("xen-pvscsi: 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;
|
|
|
+ /* fall through 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);
|
|
|
+
|
|
|
+ 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);
|
|
|
+
|
|
|
+ DPRINTK("%p %d\n", 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);
|
|
|
+ info->ring_error = 0;
|
|
|
+ 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);
|
|
|
+
|
|
|
+ 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("xen-pvscsi: %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 u8 scsiback_get_fabric_proto_ident(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;
|
|
|
+
|
|
|
+ switch (tport->tport_proto_id) {
|
|
|
+ case SCSI_PROTOCOL_SAS:
|
|
|
+ return sas_get_fabric_proto_ident(se_tpg);
|
|
|
+ case SCSI_PROTOCOL_FCP:
|
|
|
+ return fc_get_fabric_proto_ident(se_tpg);
|
|
|
+ case SCSI_PROTOCOL_ISCSI:
|
|
|
+ return iscsi_get_fabric_proto_ident(se_tpg);
|
|
|
+ default:
|
|
|
+ pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n",
|
|
|
+ tport->tport_proto_id);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ return sas_get_fabric_proto_ident(se_tpg);
|
|
|
+}
|
|
|
+
|
|
|
+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 u32 scsiback_get_default_depth(struct se_portal_group *se_tpg)
|
|
|
+{
|
|
|
+ return 1;
|
|
|
+}
|
|
|
+
|
|
|
+static u32
|
|
|
+scsiback_get_pr_transport_id(struct se_portal_group *se_tpg,
|
|
|
+ struct se_node_acl *se_nacl,
|
|
|
+ struct t10_pr_registration *pr_reg,
|
|
|
+ int *format_code,
|
|
|
+ unsigned char *buf)
|
|
|
+{
|
|
|
+ struct scsiback_tpg *tpg = container_of(se_tpg,
|
|
|
+ struct scsiback_tpg, se_tpg);
|
|
|
+ struct scsiback_tport *tport = tpg->tport;
|
|
|
+
|
|
|
+ switch (tport->tport_proto_id) {
|
|
|
+ case SCSI_PROTOCOL_SAS:
|
|
|
+ return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
|
|
|
+ format_code, buf);
|
|
|
+ case SCSI_PROTOCOL_FCP:
|
|
|
+ return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
|
|
|
+ format_code, buf);
|
|
|
+ case SCSI_PROTOCOL_ISCSI:
|
|
|
+ return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
|
|
|
+ format_code, buf);
|
|
|
+ default:
|
|
|
+ pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n",
|
|
|
+ tport->tport_proto_id);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
|
|
|
+ format_code, buf);
|
|
|
+}
|
|
|
+
|
|
|
+static u32
|
|
|
+scsiback_get_pr_transport_id_len(struct se_portal_group *se_tpg,
|
|
|
+ struct se_node_acl *se_nacl,
|
|
|
+ struct t10_pr_registration *pr_reg,
|
|
|
+ int *format_code)
|
|
|
+{
|
|
|
+ struct scsiback_tpg *tpg = container_of(se_tpg,
|
|
|
+ struct scsiback_tpg, se_tpg);
|
|
|
+ struct scsiback_tport *tport = tpg->tport;
|
|
|
+
|
|
|
+ switch (tport->tport_proto_id) {
|
|
|
+ case SCSI_PROTOCOL_SAS:
|
|
|
+ return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
|
|
|
+ format_code);
|
|
|
+ case SCSI_PROTOCOL_FCP:
|
|
|
+ return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
|
|
|
+ format_code);
|
|
|
+ case SCSI_PROTOCOL_ISCSI:
|
|
|
+ return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
|
|
|
+ format_code);
|
|
|
+ default:
|
|
|
+ pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n",
|
|
|
+ tport->tport_proto_id);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
|
|
|
+ format_code);
|
|
|
+}
|
|
|
+
|
|
|
+static char *
|
|
|
+scsiback_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
|
|
|
+ const char *buf,
|
|
|
+ u32 *out_tid_len,
|
|
|
+ char **port_nexus_ptr)
|
|
|
+{
|
|
|
+ struct scsiback_tpg *tpg = container_of(se_tpg,
|
|
|
+ struct scsiback_tpg, se_tpg);
|
|
|
+ struct scsiback_tport *tport = tpg->tport;
|
|
|
+
|
|
|
+ switch (tport->tport_proto_id) {
|
|
|
+ case SCSI_PROTOCOL_SAS:
|
|
|
+ return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
|
|
|
+ port_nexus_ptr);
|
|
|
+ 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_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("xen-pvscsi: 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("xen-pvscsi: Deallocating emulated Target %s Address: %s\n",
|
|
|
+ scsiback_dump_proto_id(tport), tport->tport_name);
|
|
|
+
|
|
|
+ kfree(tport);
|
|
|
+}
|
|
|
+
|
|
|
+static struct se_node_acl *
|
|
|
+scsiback_alloc_fabric_acl(struct se_portal_group *se_tpg)
|
|
|
+{
|
|
|
+ return kzalloc(sizeof(struct se_node_acl), GFP_KERNEL);
|
|
|
+}
|
|
|
+
|
|
|
+static void
|
|
|
+scsiback_release_fabric_acl(struct se_portal_group *se_tpg,
|
|
|
+ struct se_node_acl *se_nacl)
|
|
|
+{
|
|
|
+ kfree(se_nacl);
|
|
|
+}
|
|
|
+
|
|
|
+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)
|
|
|
+{
|
|
|
+ /*
|
|
|
+ * Do not release struct se_cmd's containing a valid TMR
|
|
|
+ * pointer. These will be released directly in scsiback_device_action()
|
|
|
+ * with transport_generic_free_cmd().
|
|
|
+ */
|
|
|
+ if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ transport_generic_free_cmd(se_cmd, 0);
|
|
|
+ return 1;
|
|
|
+}
|
|
|
+
|
|
|
+static void scsiback_release_cmd(struct se_cmd *se_cmd)
|
|
|
+{
|
|
|
+ struct vscsibk_pend *pending_req = container_of(se_cmd,
|
|
|
+ struct vscsibk_pend, se_cmd);
|
|
|
+
|
|
|
+ kmem_cache_free(scsiback_cachep, pending_req);
|
|
|
+}
|
|
|
+
|
|
|
+static int scsiback_shutdown_session(struct se_session *se_sess)
|
|
|
+{
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static void scsiback_close_session(struct se_session *se_sess)
|
|
|
+{
|
|
|
+}
|
|
|
+
|
|
|
+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 int scsiback_write_pending_status(struct se_cmd *se_cmd)
|
|
|
+{
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static void scsiback_set_default_node_attrs(struct se_node_acl *nacl)
|
|
|
+{
|
|
|
+}
|
|
|
+
|
|
|
+static u32 scsiback_get_task_tag(struct se_cmd *se_cmd)
|
|
|
+{
|
|
|
+ struct vscsibk_pend *pending_req = container_of(se_cmd,
|
|
|
+ struct vscsibk_pend, se_cmd);
|
|
|
+
|
|
|
+ return pending_req->rqid;
|
|
|
+}
|
|
|
+
|
|
|
+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 = (DRIVER_SENSE << 24) |
|
|
|
+ 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 se_tmr_req *se_tmr = se_cmd->se_tmr_req;
|
|
|
+ struct scsiback_tmr *tmr = se_tmr->fabric_tmr_ptr;
|
|
|
+
|
|
|
+ atomic_set(&tmr->tmr_complete, 1);
|
|
|
+ wake_up(&tmr->tmr_wait);
|
|
|
+}
|
|
|
+
|
|
|
+static void scsiback_aborted_task(struct se_cmd *se_cmd)
|
|
|
+{
|
|
|
+}
|
|
|
+
|
|
|
+static ssize_t scsiback_tpg_param_show_alias(struct se_portal_group *se_tpg,
|
|
|
+ char *page)
|
|
|
+{
|
|
|
+ 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_store_alias(struct se_portal_group *se_tpg,
|
|
|
+ const char *page, size_t count)
|
|
|
+{
|
|
|
+ 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;
|
|
|
+}
|
|
|
+
|
|
|
+TF_TPG_PARAM_ATTR(scsiback, alias, S_IRUGO | S_IWUSR);
|
|
|
+
|
|
|
+static struct configfs_attribute *scsiback_param_attrs[] = {
|
|
|
+ &scsiback_tpg_param_alias.attr,
|
|
|
+ NULL,
|
|
|
+};
|
|
|
+
|
|
|
+static int scsiback_make_nexus(struct scsiback_tpg *tpg,
|
|
|
+ const char *name)
|
|
|
+{
|
|
|
+ struct se_portal_group *se_tpg;
|
|
|
+ struct se_session *se_sess;
|
|
|
+ struct scsiback_nexus *tv_nexus;
|
|
|
+
|
|
|
+ mutex_lock(&tpg->tv_tpg_mutex);
|
|
|
+ if (tpg->tpg_nexus) {
|
|
|
+ mutex_unlock(&tpg->tv_tpg_mutex);
|
|
|
+ pr_debug("tpg->tpg_nexus already exists\n");
|
|
|
+ return -EEXIST;
|
|
|
+ }
|
|
|
+ se_tpg = &tpg->se_tpg;
|
|
|
+
|
|
|
+ tv_nexus = kzalloc(sizeof(struct scsiback_nexus), GFP_KERNEL);
|
|
|
+ if (!tv_nexus) {
|
|
|
+ mutex_unlock(&tpg->tv_tpg_mutex);
|
|
|
+ return -ENOMEM;
|
|
|
+ }
|
|
|
+ /*
|
|
|
+ * Initialize the struct se_session pointer
|
|
|
+ */
|
|
|
+ tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
|
|
|
+ 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;
|
|
|
+ /*
|
|
|
+ * Since we are running in 'demo mode' this call with generate a
|
|
|
+ * struct se_node_acl for the scsiback 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 pvscsi 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:
|
|
|
+ transport_free_session(se_sess);
|
|
|
+ kfree(tv_nexus);
|
|
|
+ return -ENOMEM;
|
|
|
+}
|
|
|
+
|
|
|
+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("xen-pvscsi: 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
|
|
|
+ */
|
|
|
+ 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 scsiback_tpg_show_nexus(struct se_portal_group *se_tpg,
|
|
|
+ char *page)
|
|
|
+{
|
|
|
+ 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_store_nexus(struct se_portal_group *se_tpg,
|
|
|
+ const char *page,
|
|
|
+ size_t count)
|
|
|
+{
|
|
|
+ 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;
|
|
|
+}
|
|
|
+
|
|
|
+TF_TPG_BASE_ATTR(scsiback, nexus, S_IRUGO | S_IWUSR);
|
|
|
+
|
|
|
+static struct configfs_attribute *scsiback_tpg_attrs[] = {
|
|
|
+ &scsiback_tpg_nexus.attr,
|
|
|
+ NULL,
|
|
|
+};
|
|
|
+
|
|
|
+static ssize_t
|
|
|
+scsiback_wwn_show_attr_version(struct target_fabric_configfs *tf,
|
|
|
+ char *page)
|
|
|
+{
|
|
|
+ return sprintf(page, "xen-pvscsi fabric module %s on %s/%s on "
|
|
|
+ UTS_RELEASE"\n",
|
|
|
+ VSCSI_VERSION, utsname()->sysname, utsname()->machine);
|
|
|
+}
|
|
|
+
|
|
|
+TF_WWN_ATTR_RO(scsiback, version);
|
|
|
+
|
|
|
+static struct configfs_attribute *scsiback_wwn_attrs[] = {
|
|
|
+ &scsiback_wwn_version.attr,
|
|
|
+ NULL,
|
|
|
+};
|
|
|
+
|
|
|
+static char *scsiback_get_fabric_name(void)
|
|
|
+{
|
|
|
+ return "xen-pvscsi";
|
|
|
+}
|
|
|
+
|
|
|
+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,
|
|
|
+ struct config_group *group,
|
|
|
+ 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(&scsiback_fabric_configfs->tf_ops, wwn,
|
|
|
+ &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
|
|
|
+ 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 struct target_core_fabric_ops scsiback_ops = {
|
|
|
+ .get_fabric_name = scsiback_get_fabric_name,
|
|
|
+ .get_fabric_proto_ident = scsiback_get_fabric_proto_ident,
|
|
|
+ .tpg_get_wwn = scsiback_get_fabric_wwn,
|
|
|
+ .tpg_get_tag = scsiback_get_tag,
|
|
|
+ .tpg_get_default_depth = scsiback_get_default_depth,
|
|
|
+ .tpg_get_pr_transport_id = scsiback_get_pr_transport_id,
|
|
|
+ .tpg_get_pr_transport_id_len = scsiback_get_pr_transport_id_len,
|
|
|
+ .tpg_parse_pr_out_transport_id = scsiback_parse_pr_out_transport_id,
|
|
|
+ .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_alloc_fabric_acl = scsiback_alloc_fabric_acl,
|
|
|
+ .tpg_release_fabric_acl = scsiback_release_fabric_acl,
|
|
|
+ .tpg_get_inst_index = scsiback_tpg_get_inst_index,
|
|
|
+ .check_stop_free = scsiback_check_stop_free,
|
|
|
+ .release_cmd = scsiback_release_cmd,
|
|
|
+ .put_session = NULL,
|
|
|
+ .shutdown_session = scsiback_shutdown_session,
|
|
|
+ .close_session = scsiback_close_session,
|
|
|
+ .sess_get_index = scsiback_sess_get_index,
|
|
|
+ .sess_get_initiator_sid = NULL,
|
|
|
+ .write_pending = scsiback_write_pending,
|
|
|
+ .write_pending_status = scsiback_write_pending_status,
|
|
|
+ .set_default_node_attributes = scsiback_set_default_node_attrs,
|
|
|
+ .get_task_tag = scsiback_get_task_tag,
|
|
|
+ .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,
|
|
|
+ .fabric_make_np = NULL,
|
|
|
+ .fabric_drop_np = NULL,
|
|
|
+#if 0
|
|
|
+ .fabric_make_nodeacl = scsiback_make_nodeacl,
|
|
|
+ .fabric_drop_nodeacl = scsiback_drop_nodeacl,
|
|
|
+#endif
|
|
|
+};
|
|
|
+
|
|
|
+static int scsiback_register_configfs(void)
|
|
|
+{
|
|
|
+ struct target_fabric_configfs *fabric;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ pr_debug("xen-pvscsi: fabric module %s on %s/%s on "UTS_RELEASE"\n",
|
|
|
+ VSCSI_VERSION, utsname()->sysname, utsname()->machine);
|
|
|
+ /*
|
|
|
+ * Register the top level struct config_item_type with TCM core
|
|
|
+ */
|
|
|
+ fabric = target_fabric_configfs_init(THIS_MODULE, "xen-pvscsi");
|
|
|
+ if (IS_ERR(fabric))
|
|
|
+ return PTR_ERR(fabric);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Setup fabric->tf_ops from our local scsiback_ops
|
|
|
+ */
|
|
|
+ fabric->tf_ops = scsiback_ops;
|
|
|
+ /*
|
|
|
+ * Setup default attribute lists for various fabric->tf_cit_tmpl
|
|
|
+ */
|
|
|
+ fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = scsiback_wwn_attrs;
|
|
|
+ fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = scsiback_tpg_attrs;
|
|
|
+ fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
|
|
|
+ fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = scsiback_param_attrs;
|
|
|
+ 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) {
|
|
|
+ target_fabric_configfs_free(fabric);
|
|
|
+ return ret;
|
|
|
+ }
|
|
|
+ /*
|
|
|
+ * Setup our local pointer to *fabric
|
|
|
+ */
|
|
|
+ scsiback_fabric_configfs = fabric;
|
|
|
+ pr_debug("xen-pvscsi: Set fabric -> scsiback_fabric_configfs\n");
|
|
|
+ return 0;
|
|
|
+};
|
|
|
+
|
|
|
+static void scsiback_deregister_configfs(void)
|
|
|
+{
|
|
|
+ if (!scsiback_fabric_configfs)
|
|
|
+ return;
|
|
|
+
|
|
|
+ target_fabric_configfs_deregister(scsiback_fabric_configfs);
|
|
|
+ scsiback_fabric_configfs = NULL;
|
|
|
+ pr_debug("xen-pvscsi: Cleared scsiback_fabric_configfs\n");
|
|
|
+};
|
|
|
+
|
|
|
+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 void scsiback_init_pend(void *p)
|
|
|
+{
|
|
|
+ struct vscsibk_pend *pend = p;
|
|
|
+ int i;
|
|
|
+
|
|
|
+ memset(pend, 0, sizeof(*pend));
|
|
|
+ for (i = 0; i < VSCSI_MAX_GRANTS; i++)
|
|
|
+ pend->grant_handles[i] = SCSIBACK_INVALID_HANDLE;
|
|
|
+}
|
|
|
+
|
|
|
+static int __init scsiback_init(void)
|
|
|
+{
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ if (!xen_domain())
|
|
|
+ return -ENODEV;
|
|
|
+
|
|
|
+ scsiback_cachep = kmem_cache_create("vscsiif_cache",
|
|
|
+ sizeof(struct vscsibk_pend), 0, 0, scsiback_init_pend);
|
|
|
+ if (!scsiback_cachep)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ ret = xenbus_register_backend(&scsiback_driver);
|
|
|
+ if (ret)
|
|
|
+ goto out_cache_destroy;
|
|
|
+
|
|
|
+ ret = scsiback_register_configfs();
|
|
|
+ if (ret)
|
|
|
+ goto out_unregister_xenbus;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+out_unregister_xenbus:
|
|
|
+ xenbus_unregister_driver(&scsiback_driver);
|
|
|
+out_cache_destroy:
|
|
|
+ kmem_cache_destroy(scsiback_cachep);
|
|
|
+ pr_err("xen-pvscsi: %s: error %d\n", __func__, ret);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static void __exit scsiback_exit(void)
|
|
|
+{
|
|
|
+ struct page *page;
|
|
|
+
|
|
|
+ while (free_pages_num) {
|
|
|
+ if (get_free_page(&page))
|
|
|
+ BUG();
|
|
|
+ free_xenballooned_pages(1, &page);
|
|
|
+ }
|
|
|
+ scsiback_deregister_configfs();
|
|
|
+ xenbus_unregister_driver(&scsiback_driver);
|
|
|
+ kmem_cache_destroy(scsiback_cachep);
|
|
|
+}
|
|
|
+
|
|
|
+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>");
|
Linus Torvalds