v4.19.13 snapshot.
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
new file mode 100644
index 0000000..e7e3ae1
--- /dev/null
+++ b/drivers/vhost/scsi.c
@@ -0,0 +1,2144 @@
+/*******************************************************************************
+ * Vhost kernel TCM fabric driver for virtio SCSI initiators
+ *
+ * (C) Copyright 2010-2013 Datera, Inc.
+ * (C) Copyright 2010-2012 IBM Corp.
+ *
+ * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
+ *
+ * Authors: Nicholas A. Bellinger <nab@daterainc.com>
+ * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ ****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <generated/utsrelease.h>
+#include <linux/utsname.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/kthread.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/configfs.h>
+#include <linux/ctype.h>
+#include <linux/compat.h>
+#include <linux/eventfd.h>
+#include <linux/fs.h>
+#include <linux/vmalloc.h>
+#include <linux/miscdevice.h>
+#include <asm/unaligned.h>
+#include <scsi/scsi_common.h>
+#include <scsi/scsi_proto.h>
+#include <target/target_core_base.h>
+#include <target/target_core_fabric.h>
+#include <linux/vhost.h>
+#include <linux/virtio_scsi.h>
+#include <linux/llist.h>
+#include <linux/bitmap.h>
+
+#include "vhost.h"
+
+#define VHOST_SCSI_VERSION "v0.1"
+#define VHOST_SCSI_NAMELEN 256
+#define VHOST_SCSI_MAX_CDB_SIZE 32
+#define VHOST_SCSI_DEFAULT_TAGS 256
+#define VHOST_SCSI_PREALLOC_SGLS 2048
+#define VHOST_SCSI_PREALLOC_UPAGES 2048
+#define VHOST_SCSI_PREALLOC_PROT_SGLS 2048
+
+struct vhost_scsi_inflight {
+ /* Wait for the flush operation to finish */
+ struct completion comp;
+ /* Refcount for the inflight reqs */
+ struct kref kref;
+};
+
+struct vhost_scsi_cmd {
+ /* Descriptor from vhost_get_vq_desc() for virt_queue segment */
+ int tvc_vq_desc;
+ /* virtio-scsi initiator task attribute */
+ int tvc_task_attr;
+ /* virtio-scsi response incoming iovecs */
+ int tvc_in_iovs;
+ /* virtio-scsi initiator data direction */
+ enum dma_data_direction tvc_data_direction;
+ /* Expected data transfer length from virtio-scsi header */
+ u32 tvc_exp_data_len;
+ /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */
+ u64 tvc_tag;
+ /* The number of scatterlists associated with this cmd */
+ u32 tvc_sgl_count;
+ u32 tvc_prot_sgl_count;
+ /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */
+ u32 tvc_lun;
+ /* Pointer to the SGL formatted memory from virtio-scsi */
+ struct scatterlist *tvc_sgl;
+ struct scatterlist *tvc_prot_sgl;
+ struct page **tvc_upages;
+ /* Pointer to response header iovec */
+ struct iovec tvc_resp_iov;
+ /* Pointer to vhost_scsi for our device */
+ struct vhost_scsi *tvc_vhost;
+ /* Pointer to vhost_virtqueue for the cmd */
+ struct vhost_virtqueue *tvc_vq;
+ /* Pointer to vhost nexus memory */
+ struct vhost_scsi_nexus *tvc_nexus;
+ /* The TCM I/O descriptor that is accessed via container_of() */
+ struct se_cmd tvc_se_cmd;
+ /* work item used for cmwq dispatch to vhost_scsi_submission_work() */
+ struct work_struct work;
+ /* Copy of the incoming SCSI command descriptor block (CDB) */
+ unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE];
+ /* Sense buffer that will be mapped into outgoing status */
+ unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER];
+ /* Completed commands list, serviced from vhost worker thread */
+ struct llist_node tvc_completion_list;
+ /* Used to track inflight cmd */
+ struct vhost_scsi_inflight *inflight;
+};
+
+struct vhost_scsi_nexus {
+ /* Pointer to TCM session for I_T Nexus */
+ struct se_session *tvn_se_sess;
+};
+
+struct vhost_scsi_tpg {
+ /* Vhost port target portal group tag for TCM */
+ u16 tport_tpgt;
+ /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */
+ int tv_tpg_port_count;
+ /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */
+ int tv_tpg_vhost_count;
+ /* Used for enabling T10-PI with legacy devices */
+ int tv_fabric_prot_type;
+ /* list for vhost_scsi_list */
+ struct list_head tv_tpg_list;
+ /* Used to protect access for tpg_nexus */
+ struct mutex tv_tpg_mutex;
+ /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */
+ struct vhost_scsi_nexus *tpg_nexus;
+ /* Pointer back to vhost_scsi_tport */
+ struct vhost_scsi_tport *tport;
+ /* Returned by vhost_scsi_make_tpg() */
+ struct se_portal_group se_tpg;
+ /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */
+ struct vhost_scsi *vhost_scsi;
+};
+
+struct vhost_scsi_tport {
+ /* SCSI protocol the tport is providing */
+ u8 tport_proto_id;
+ /* Binary World Wide unique Port Name for Vhost Target port */
+ u64 tport_wwpn;
+ /* ASCII formatted WWPN for Vhost Target port */
+ char tport_name[VHOST_SCSI_NAMELEN];
+ /* Returned by vhost_scsi_make_tport() */
+ struct se_wwn tport_wwn;
+};
+
+struct vhost_scsi_evt {
+ /* event to be sent to guest */
+ struct virtio_scsi_event event;
+ /* event list, serviced from vhost worker thread */
+ struct llist_node list;
+};
+
+enum {
+ VHOST_SCSI_VQ_CTL = 0,
+ VHOST_SCSI_VQ_EVT = 1,
+ VHOST_SCSI_VQ_IO = 2,
+};
+
+/* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */
+enum {
+ VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
+ (1ULL << VIRTIO_SCSI_F_T10_PI)
+};
+
+#define VHOST_SCSI_MAX_TARGET 256
+#define VHOST_SCSI_MAX_VQ 128
+#define VHOST_SCSI_MAX_EVENT 128
+
+struct vhost_scsi_virtqueue {
+ struct vhost_virtqueue vq;
+ /*
+ * Reference counting for inflight reqs, used for flush operation. At
+ * each time, one reference tracks new commands submitted, while we
+ * wait for another one to reach 0.
+ */
+ struct vhost_scsi_inflight inflights[2];
+ /*
+ * Indicate current inflight in use, protected by vq->mutex.
+ * Writers must also take dev mutex and flush under it.
+ */
+ int inflight_idx;
+};
+
+struct vhost_scsi {
+ /* Protected by vhost_scsi->dev.mutex */
+ struct vhost_scsi_tpg **vs_tpg;
+ char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
+
+ struct vhost_dev dev;
+ struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ];
+
+ struct vhost_work vs_completion_work; /* cmd completion work item */
+ struct llist_head vs_completion_list; /* cmd completion queue */
+
+ struct vhost_work vs_event_work; /* evt injection work item */
+ struct llist_head vs_event_list; /* evt injection queue */
+
+ bool vs_events_missed; /* any missed events, protected by vq->mutex */
+ int vs_events_nr; /* num of pending events, protected by vq->mutex */
+};
+
+static struct workqueue_struct *vhost_scsi_workqueue;
+
+/* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */
+static DEFINE_MUTEX(vhost_scsi_mutex);
+static LIST_HEAD(vhost_scsi_list);
+
+static void vhost_scsi_done_inflight(struct kref *kref)
+{
+ struct vhost_scsi_inflight *inflight;
+
+ inflight = container_of(kref, struct vhost_scsi_inflight, kref);
+ complete(&inflight->comp);
+}
+
+static void vhost_scsi_init_inflight(struct vhost_scsi *vs,
+ struct vhost_scsi_inflight *old_inflight[])
+{
+ struct vhost_scsi_inflight *new_inflight;
+ struct vhost_virtqueue *vq;
+ int idx, i;
+
+ for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
+ vq = &vs->vqs[i].vq;
+
+ mutex_lock(&vq->mutex);
+
+ /* store old infight */
+ idx = vs->vqs[i].inflight_idx;
+ if (old_inflight)
+ old_inflight[i] = &vs->vqs[i].inflights[idx];
+
+ /* setup new infight */
+ vs->vqs[i].inflight_idx = idx ^ 1;
+ new_inflight = &vs->vqs[i].inflights[idx ^ 1];
+ kref_init(&new_inflight->kref);
+ init_completion(&new_inflight->comp);
+
+ mutex_unlock(&vq->mutex);
+ }
+}
+
+static struct vhost_scsi_inflight *
+vhost_scsi_get_inflight(struct vhost_virtqueue *vq)
+{
+ struct vhost_scsi_inflight *inflight;
+ struct vhost_scsi_virtqueue *svq;
+
+ svq = container_of(vq, struct vhost_scsi_virtqueue, vq);
+ inflight = &svq->inflights[svq->inflight_idx];
+ kref_get(&inflight->kref);
+
+ return inflight;
+}
+
+static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight)
+{
+ kref_put(&inflight->kref, vhost_scsi_done_inflight);
+}
+
+static int vhost_scsi_check_true(struct se_portal_group *se_tpg)
+{
+ return 1;
+}
+
+static int vhost_scsi_check_false(struct se_portal_group *se_tpg)
+{
+ return 0;
+}
+
+static char *vhost_scsi_get_fabric_name(void)
+{
+ return "vhost";
+}
+
+static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg)
+{
+ struct vhost_scsi_tpg *tpg = container_of(se_tpg,
+ struct vhost_scsi_tpg, se_tpg);
+ struct vhost_scsi_tport *tport = tpg->tport;
+
+ return &tport->tport_name[0];
+}
+
+static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg)
+{
+ struct vhost_scsi_tpg *tpg = container_of(se_tpg,
+ struct vhost_scsi_tpg, se_tpg);
+ return tpg->tport_tpgt;
+}
+
+static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg)
+{
+ struct vhost_scsi_tpg *tpg = container_of(se_tpg,
+ struct vhost_scsi_tpg, se_tpg);
+
+ return tpg->tv_fabric_prot_type;
+}
+
+static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg)
+{
+ return 1;
+}
+
+static void vhost_scsi_release_cmd(struct se_cmd *se_cmd)
+{
+ struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd,
+ struct vhost_scsi_cmd, tvc_se_cmd);
+ struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess;
+ int i;
+
+ if (tv_cmd->tvc_sgl_count) {
+ for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
+ put_page(sg_page(&tv_cmd->tvc_sgl[i]));
+ }
+ if (tv_cmd->tvc_prot_sgl_count) {
+ for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++)
+ put_page(sg_page(&tv_cmd->tvc_prot_sgl[i]));
+ }
+
+ vhost_scsi_put_inflight(tv_cmd->inflight);
+ target_free_tag(se_sess, se_cmd);
+}
+
+static u32 vhost_scsi_sess_get_index(struct se_session *se_sess)
+{
+ return 0;
+}
+
+static int vhost_scsi_write_pending(struct se_cmd *se_cmd)
+{
+ /* Go ahead and process the write immediately */
+ target_execute_cmd(se_cmd);
+ return 0;
+}
+
+static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd)
+{
+ return 0;
+}
+
+static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl)
+{
+ return;
+}
+
+static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd)
+{
+ return 0;
+}
+
+static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd)
+{
+ struct vhost_scsi *vs = cmd->tvc_vhost;
+
+ llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list);
+
+ vhost_work_queue(&vs->dev, &vs->vs_completion_work);
+}
+
+static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd)
+{
+ struct vhost_scsi_cmd *cmd = container_of(se_cmd,
+ struct vhost_scsi_cmd, tvc_se_cmd);
+ vhost_scsi_complete_cmd(cmd);
+ return 0;
+}
+
+static int vhost_scsi_queue_status(struct se_cmd *se_cmd)
+{
+ struct vhost_scsi_cmd *cmd = container_of(se_cmd,
+ struct vhost_scsi_cmd, tvc_se_cmd);
+ vhost_scsi_complete_cmd(cmd);
+ return 0;
+}
+
+static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd)
+{
+ return;
+}
+
+static void vhost_scsi_aborted_task(struct se_cmd *se_cmd)
+{
+ return;
+}
+
+static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
+{
+ vs->vs_events_nr--;
+ kfree(evt);
+}
+
+static struct vhost_scsi_evt *
+vhost_scsi_allocate_evt(struct vhost_scsi *vs,
+ u32 event, u32 reason)
+{
+ struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
+ struct vhost_scsi_evt *evt;
+
+ if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
+ vs->vs_events_missed = true;
+ return NULL;
+ }
+
+ evt = kzalloc(sizeof(*evt), GFP_KERNEL);
+ if (!evt) {
+ vq_err(vq, "Failed to allocate vhost_scsi_evt\n");
+ vs->vs_events_missed = true;
+ return NULL;
+ }
+
+ evt->event.event = cpu_to_vhost32(vq, event);
+ evt->event.reason = cpu_to_vhost32(vq, reason);
+ vs->vs_events_nr++;
+
+ return evt;
+}
+
+static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd)
+{
+ struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
+
+ /* TODO locking against target/backend threads? */
+ transport_generic_free_cmd(se_cmd, 0);
+
+}
+
+static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd)
+{
+ return target_put_sess_cmd(se_cmd);
+}
+
+static void
+vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
+{
+ struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
+ struct virtio_scsi_event *event = &evt->event;
+ struct virtio_scsi_event __user *eventp;
+ unsigned out, in;
+ int head, ret;
+
+ if (!vq->private_data) {
+ vs->vs_events_missed = true;
+ return;
+ }
+
+again:
+ vhost_disable_notify(&vs->dev, vq);
+ head = vhost_get_vq_desc(vq, vq->iov,
+ ARRAY_SIZE(vq->iov), &out, &in,
+ NULL, NULL);
+ if (head < 0) {
+ vs->vs_events_missed = true;
+ return;
+ }
+ if (head == vq->num) {
+ if (vhost_enable_notify(&vs->dev, vq))
+ goto again;
+ vs->vs_events_missed = true;
+ return;
+ }
+
+ if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
+ vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
+ vq->iov[out].iov_len);
+ vs->vs_events_missed = true;
+ return;
+ }
+
+ if (vs->vs_events_missed) {
+ event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED);
+ vs->vs_events_missed = false;
+ }
+
+ eventp = vq->iov[out].iov_base;
+ ret = __copy_to_user(eventp, event, sizeof(*event));
+ if (!ret)
+ vhost_add_used_and_signal(&vs->dev, vq, head, 0);
+ else
+ vq_err(vq, "Faulted on vhost_scsi_send_event\n");
+}
+
+static void vhost_scsi_evt_work(struct vhost_work *work)
+{
+ struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
+ vs_event_work);
+ struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
+ struct vhost_scsi_evt *evt, *t;
+ struct llist_node *llnode;
+
+ mutex_lock(&vq->mutex);
+ llnode = llist_del_all(&vs->vs_event_list);
+ llist_for_each_entry_safe(evt, t, llnode, list) {
+ vhost_scsi_do_evt_work(vs, evt);
+ vhost_scsi_free_evt(vs, evt);
+ }
+ mutex_unlock(&vq->mutex);
+}
+
+/* Fill in status and signal that we are done processing this command
+ *
+ * This is scheduled in the vhost work queue so we are called with the owner
+ * process mm and can access the vring.
+ */
+static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
+{
+ struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
+ vs_completion_work);
+ DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
+ struct virtio_scsi_cmd_resp v_rsp;
+ struct vhost_scsi_cmd *cmd, *t;
+ struct llist_node *llnode;
+ struct se_cmd *se_cmd;
+ struct iov_iter iov_iter;
+ int ret, vq;
+
+ bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
+ llnode = llist_del_all(&vs->vs_completion_list);
+ llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list) {
+ se_cmd = &cmd->tvc_se_cmd;
+
+ pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
+ cmd, se_cmd->residual_count, se_cmd->scsi_status);
+
+ memset(&v_rsp, 0, sizeof(v_rsp));
+ v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count);
+ /* TODO is status_qualifier field needed? */
+ v_rsp.status = se_cmd->scsi_status;
+ v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq,
+ se_cmd->scsi_sense_length);
+ memcpy(v_rsp.sense, cmd->tvc_sense_buf,
+ se_cmd->scsi_sense_length);
+
+ iov_iter_init(&iov_iter, READ, &cmd->tvc_resp_iov,
+ cmd->tvc_in_iovs, sizeof(v_rsp));
+ ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter);
+ if (likely(ret == sizeof(v_rsp))) {
+ struct vhost_scsi_virtqueue *q;
+ vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
+ q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
+ vq = q - vs->vqs;
+ __set_bit(vq, signal);
+ } else
+ pr_err("Faulted on virtio_scsi_cmd_resp\n");
+
+ vhost_scsi_free_cmd(cmd);
+ }
+
+ vq = -1;
+ while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1))
+ < VHOST_SCSI_MAX_VQ)
+ vhost_signal(&vs->dev, &vs->vqs[vq].vq);
+}
+
+static struct vhost_scsi_cmd *
+vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg,
+ unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
+ u32 exp_data_len, int data_direction)
+{
+ struct vhost_scsi_cmd *cmd;
+ struct vhost_scsi_nexus *tv_nexus;
+ struct se_session *se_sess;
+ struct scatterlist *sg, *prot_sg;
+ struct page **pages;
+ int tag, cpu;
+
+ tv_nexus = tpg->tpg_nexus;
+ if (!tv_nexus) {
+ pr_err("Unable to locate active struct vhost_scsi_nexus\n");
+ return ERR_PTR(-EIO);
+ }
+ se_sess = tv_nexus->tvn_se_sess;
+
+ tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
+ if (tag < 0) {
+ pr_err("Unable to obtain tag for vhost_scsi_cmd\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag];
+ sg = cmd->tvc_sgl;
+ prot_sg = cmd->tvc_prot_sgl;
+ pages = cmd->tvc_upages;
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->tvc_sgl = sg;
+ cmd->tvc_prot_sgl = prot_sg;
+ cmd->tvc_upages = pages;
+ cmd->tvc_se_cmd.map_tag = tag;
+ cmd->tvc_se_cmd.map_cpu = cpu;
+ cmd->tvc_tag = scsi_tag;
+ cmd->tvc_lun = lun;
+ cmd->tvc_task_attr = task_attr;
+ cmd->tvc_exp_data_len = exp_data_len;
+ cmd->tvc_data_direction = data_direction;
+ cmd->tvc_nexus = tv_nexus;
+ cmd->inflight = vhost_scsi_get_inflight(vq);
+
+ memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE);
+
+ return cmd;
+}
+
+/*
+ * Map a user memory range into a scatterlist
+ *
+ * Returns the number of scatterlist entries used or -errno on error.
+ */
+static int
+vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd,
+ struct iov_iter *iter,
+ struct scatterlist *sgl,
+ bool write)
+{
+ struct page **pages = cmd->tvc_upages;
+ struct scatterlist *sg = sgl;
+ ssize_t bytes;
+ size_t offset;
+ unsigned int npages = 0;
+
+ bytes = iov_iter_get_pages(iter, pages, LONG_MAX,
+ VHOST_SCSI_PREALLOC_UPAGES, &offset);
+ /* No pages were pinned */
+ if (bytes <= 0)
+ return bytes < 0 ? bytes : -EFAULT;
+
+ iov_iter_advance(iter, bytes);
+
+ while (bytes) {
+ unsigned n = min_t(unsigned, PAGE_SIZE - offset, bytes);
+ sg_set_page(sg++, pages[npages++], n, offset);
+ bytes -= n;
+ offset = 0;
+ }
+ return npages;
+}
+
+static int
+vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls)
+{
+ int sgl_count = 0;
+
+ if (!iter || !iter->iov) {
+ pr_err("%s: iter->iov is NULL, but expected bytes: %zu"
+ " present\n", __func__, bytes);
+ return -EINVAL;
+ }
+
+ sgl_count = iov_iter_npages(iter, 0xffff);
+ if (sgl_count > max_sgls) {
+ pr_err("%s: requested sgl_count: %d exceeds pre-allocated"
+ " max_sgls: %d\n", __func__, sgl_count, max_sgls);
+ return -EINVAL;
+ }
+ return sgl_count;
+}
+
+static int
+vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write,
+ struct iov_iter *iter,
+ struct scatterlist *sg, int sg_count)
+{
+ struct scatterlist *p = sg;
+ int ret;
+
+ while (iov_iter_count(iter)) {
+ ret = vhost_scsi_map_to_sgl(cmd, iter, sg, write);
+ if (ret < 0) {
+ while (p < sg) {
+ struct page *page = sg_page(p++);
+ if (page)
+ put_page(page);
+ }
+ return ret;
+ }
+ sg += ret;
+ }
+ return 0;
+}
+
+static int
+vhost_scsi_mapal(struct vhost_scsi_cmd *cmd,
+ size_t prot_bytes, struct iov_iter *prot_iter,
+ size_t data_bytes, struct iov_iter *data_iter)
+{
+ int sgl_count, ret;
+ bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE);
+
+ if (prot_bytes) {
+ sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes,
+ VHOST_SCSI_PREALLOC_PROT_SGLS);
+ if (sgl_count < 0)
+ return sgl_count;
+
+ sg_init_table(cmd->tvc_prot_sgl, sgl_count);
+ cmd->tvc_prot_sgl_count = sgl_count;
+ pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__,
+ cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count);
+
+ ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter,
+ cmd->tvc_prot_sgl,
+ cmd->tvc_prot_sgl_count);
+ if (ret < 0) {
+ cmd->tvc_prot_sgl_count = 0;
+ return ret;
+ }
+ }
+ sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes,
+ VHOST_SCSI_PREALLOC_SGLS);
+ if (sgl_count < 0)
+ return sgl_count;
+
+ sg_init_table(cmd->tvc_sgl, sgl_count);
+ cmd->tvc_sgl_count = sgl_count;
+ pr_debug("%s data_sg %p data_sgl_count %u\n", __func__,
+ cmd->tvc_sgl, cmd->tvc_sgl_count);
+
+ ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter,
+ cmd->tvc_sgl, cmd->tvc_sgl_count);
+ if (ret < 0) {
+ cmd->tvc_sgl_count = 0;
+ return ret;
+ }
+ return 0;
+}
+
+static int vhost_scsi_to_tcm_attr(int attr)
+{
+ switch (attr) {
+ case VIRTIO_SCSI_S_SIMPLE:
+ return TCM_SIMPLE_TAG;
+ case VIRTIO_SCSI_S_ORDERED:
+ return TCM_ORDERED_TAG;
+ case VIRTIO_SCSI_S_HEAD:
+ return TCM_HEAD_TAG;
+ case VIRTIO_SCSI_S_ACA:
+ return TCM_ACA_TAG;
+ default:
+ break;
+ }
+ return TCM_SIMPLE_TAG;
+}
+
+static void vhost_scsi_submission_work(struct work_struct *work)
+{
+ struct vhost_scsi_cmd *cmd =
+ container_of(work, struct vhost_scsi_cmd, work);
+ struct vhost_scsi_nexus *tv_nexus;
+ struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
+ struct scatterlist *sg_ptr, *sg_prot_ptr = NULL;
+ int rc;
+
+ /* FIXME: BIDI operation */
+ if (cmd->tvc_sgl_count) {
+ sg_ptr = cmd->tvc_sgl;
+
+ if (cmd->tvc_prot_sgl_count)
+ sg_prot_ptr = cmd->tvc_prot_sgl;
+ else
+ se_cmd->prot_pto = true;
+ } else {
+ sg_ptr = NULL;
+ }
+ tv_nexus = cmd->tvc_nexus;
+
+ se_cmd->tag = 0;
+ rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
+ cmd->tvc_cdb, &cmd->tvc_sense_buf[0],
+ cmd->tvc_lun, cmd->tvc_exp_data_len,
+ vhost_scsi_to_tcm_attr(cmd->tvc_task_attr),
+ cmd->tvc_data_direction, TARGET_SCF_ACK_KREF,
+ sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr,
+ cmd->tvc_prot_sgl_count);
+ if (rc < 0) {
+ transport_send_check_condition_and_sense(se_cmd,
+ TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
+ transport_generic_free_cmd(se_cmd, 0);
+ }
+}
+
+static void
+vhost_scsi_send_bad_target(struct vhost_scsi *vs,
+ struct vhost_virtqueue *vq,
+ int head, unsigned out)
+{
+ struct virtio_scsi_cmd_resp __user *resp;
+ struct virtio_scsi_cmd_resp rsp;
+ int ret;
+
+ memset(&rsp, 0, sizeof(rsp));
+ rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
+ resp = vq->iov[out].iov_base;
+ ret = __copy_to_user(resp, &rsp, sizeof(rsp));
+ if (!ret)
+ vhost_add_used_and_signal(&vs->dev, vq, head, 0);
+ else
+ pr_err("Faulted on virtio_scsi_cmd_resp\n");
+}
+
+static void
+vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
+{
+ struct vhost_scsi_tpg **vs_tpg, *tpg;
+ struct virtio_scsi_cmd_req v_req;
+ struct virtio_scsi_cmd_req_pi v_req_pi;
+ struct vhost_scsi_cmd *cmd;
+ struct iov_iter out_iter, in_iter, prot_iter, data_iter;
+ u64 tag;
+ u32 exp_data_len, data_direction;
+ unsigned int out = 0, in = 0;
+ int head, ret, prot_bytes;
+ size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp);
+ size_t out_size, in_size;
+ u16 lun;
+ u8 *target, *lunp, task_attr;
+ bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI);
+ void *req, *cdb;
+
+ mutex_lock(&vq->mutex);
+ /*
+ * We can handle the vq only after the endpoint is setup by calling the
+ * VHOST_SCSI_SET_ENDPOINT ioctl.
+ */
+ vs_tpg = vq->private_data;
+ if (!vs_tpg)
+ goto out;
+
+ vhost_disable_notify(&vs->dev, vq);
+
+ for (;;) {
+ head = vhost_get_vq_desc(vq, vq->iov,
+ ARRAY_SIZE(vq->iov), &out, &in,
+ NULL, NULL);
+ pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
+ head, out, in);
+ /* On error, stop handling until the next kick. */
+ if (unlikely(head < 0))
+ break;
+ /* Nothing new? Wait for eventfd to tell us they refilled. */
+ if (head == vq->num) {
+ if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
+ vhost_disable_notify(&vs->dev, vq);
+ continue;
+ }
+ break;
+ }
+ /*
+ * Check for a sane response buffer so we can report early
+ * errors back to the guest.
+ */
+ if (unlikely(vq->iov[out].iov_len < rsp_size)) {
+ vq_err(vq, "Expecting at least virtio_scsi_cmd_resp"
+ " size, got %zu bytes\n", vq->iov[out].iov_len);
+ break;
+ }
+ /*
+ * Setup pointers and values based upon different virtio-scsi
+ * request header if T10_PI is enabled in KVM guest.
+ */
+ if (t10_pi) {
+ req = &v_req_pi;
+ req_size = sizeof(v_req_pi);
+ lunp = &v_req_pi.lun[0];
+ target = &v_req_pi.lun[1];
+ } else {
+ req = &v_req;
+ req_size = sizeof(v_req);
+ lunp = &v_req.lun[0];
+ target = &v_req.lun[1];
+ }
+ /*
+ * FIXME: Not correct for BIDI operation
+ */
+ out_size = iov_length(vq->iov, out);
+ in_size = iov_length(&vq->iov[out], in);
+
+ /*
+ * Copy over the virtio-scsi request header, which for a
+ * ANY_LAYOUT enabled guest may span multiple iovecs, or a
+ * single iovec may contain both the header + outgoing
+ * WRITE payloads.
+ *
+ * copy_from_iter() will advance out_iter, so that it will
+ * point at the start of the outgoing WRITE payload, if
+ * DMA_TO_DEVICE is set.
+ */
+ iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size);
+
+ if (unlikely(!copy_from_iter_full(req, req_size, &out_iter))) {
+ vq_err(vq, "Faulted on copy_from_iter\n");
+ vhost_scsi_send_bad_target(vs, vq, head, out);
+ continue;
+ }
+ /* virtio-scsi spec requires byte 0 of the lun to be 1 */
+ if (unlikely(*lunp != 1)) {
+ vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp);
+ vhost_scsi_send_bad_target(vs, vq, head, out);
+ continue;
+ }
+
+ tpg = READ_ONCE(vs_tpg[*target]);
+ if (unlikely(!tpg)) {
+ /* Target does not exist, fail the request */
+ vhost_scsi_send_bad_target(vs, vq, head, out);
+ continue;
+ }
+ /*
+ * Determine data_direction by calculating the total outgoing
+ * iovec sizes + incoming iovec sizes vs. virtio-scsi request +
+ * response headers respectively.
+ *
+ * For DMA_TO_DEVICE this is out_iter, which is already pointing
+ * to the right place.
+ *
+ * For DMA_FROM_DEVICE, the iovec will be just past the end
+ * of the virtio-scsi response header in either the same
+ * or immediately following iovec.
+ *
+ * Any associated T10_PI bytes for the outgoing / incoming
+ * payloads are included in calculation of exp_data_len here.
+ */
+ prot_bytes = 0;
+
+ if (out_size > req_size) {
+ data_direction = DMA_TO_DEVICE;
+ exp_data_len = out_size - req_size;
+ data_iter = out_iter;
+ } else if (in_size > rsp_size) {
+ data_direction = DMA_FROM_DEVICE;
+ exp_data_len = in_size - rsp_size;
+
+ iov_iter_init(&in_iter, READ, &vq->iov[out], in,
+ rsp_size + exp_data_len);
+ iov_iter_advance(&in_iter, rsp_size);
+ data_iter = in_iter;
+ } else {
+ data_direction = DMA_NONE;
+ exp_data_len = 0;
+ }
+ /*
+ * If T10_PI header + payload is present, setup prot_iter values
+ * and recalculate data_iter for vhost_scsi_mapal() mapping to
+ * host scatterlists via get_user_pages_fast().
+ */
+ if (t10_pi) {
+ if (v_req_pi.pi_bytesout) {
+ if (data_direction != DMA_TO_DEVICE) {
+ vq_err(vq, "Received non zero pi_bytesout,"
+ " but wrong data_direction\n");
+ vhost_scsi_send_bad_target(vs, vq, head, out);
+ continue;
+ }
+ prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout);
+ } else if (v_req_pi.pi_bytesin) {
+ if (data_direction != DMA_FROM_DEVICE) {
+ vq_err(vq, "Received non zero pi_bytesin,"
+ " but wrong data_direction\n");
+ vhost_scsi_send_bad_target(vs, vq, head, out);
+ continue;
+ }
+ prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin);
+ }
+ /*
+ * Set prot_iter to data_iter and truncate it to
+ * prot_bytes, and advance data_iter past any
+ * preceeding prot_bytes that may be present.
+ *
+ * Also fix up the exp_data_len to reflect only the
+ * actual data payload length.
+ */
+ if (prot_bytes) {
+ exp_data_len -= prot_bytes;
+ prot_iter = data_iter;
+ iov_iter_truncate(&prot_iter, prot_bytes);
+ iov_iter_advance(&data_iter, prot_bytes);
+ }
+ tag = vhost64_to_cpu(vq, v_req_pi.tag);
+ task_attr = v_req_pi.task_attr;
+ cdb = &v_req_pi.cdb[0];
+ lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF;
+ } else {
+ tag = vhost64_to_cpu(vq, v_req.tag);
+ task_attr = v_req.task_attr;
+ cdb = &v_req.cdb[0];
+ lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
+ }
+ /*
+ * Check that the received CDB size does not exceeded our
+ * hardcoded max for vhost-scsi, then get a pre-allocated
+ * cmd descriptor for the new virtio-scsi tag.
+ *
+ * TODO what if cdb was too small for varlen cdb header?
+ */
+ if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) {
+ vq_err(vq, "Received SCSI CDB with command_size: %d that"
+ " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
+ scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE);
+ vhost_scsi_send_bad_target(vs, vq, head, out);
+ continue;
+ }
+ cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr,
+ exp_data_len + prot_bytes,
+ data_direction);
+ if (IS_ERR(cmd)) {
+ vq_err(vq, "vhost_scsi_get_tag failed %ld\n",
+ PTR_ERR(cmd));
+ vhost_scsi_send_bad_target(vs, vq, head, out);
+ continue;
+ }
+ cmd->tvc_vhost = vs;
+ cmd->tvc_vq = vq;
+ cmd->tvc_resp_iov = vq->iov[out];
+ cmd->tvc_in_iovs = in;
+
+ pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
+ cmd->tvc_cdb[0], cmd->tvc_lun);
+ pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:"
+ " %d\n", cmd, exp_data_len, prot_bytes, data_direction);
+
+ if (data_direction != DMA_NONE) {
+ ret = vhost_scsi_mapal(cmd,
+ prot_bytes, &prot_iter,
+ exp_data_len, &data_iter);
+ if (unlikely(ret)) {
+ vq_err(vq, "Failed to map iov to sgl\n");
+ vhost_scsi_release_cmd(&cmd->tvc_se_cmd);
+ vhost_scsi_send_bad_target(vs, vq, head, out);
+ continue;
+ }
+ }
+ /*
+ * Save the descriptor from vhost_get_vq_desc() to be used to
+ * complete the virtio-scsi request in TCM callback context via
+ * vhost_scsi_queue_data_in() and vhost_scsi_queue_status()
+ */
+ cmd->tvc_vq_desc = head;
+ /*
+ * Dispatch cmd descriptor for cmwq execution in process
+ * context provided by vhost_scsi_workqueue. This also ensures
+ * cmd is executed on the same kworker CPU as this vhost
+ * thread to gain positive L2 cache locality effects.
+ */
+ INIT_WORK(&cmd->work, vhost_scsi_submission_work);
+ queue_work(vhost_scsi_workqueue, &cmd->work);
+ }
+out:
+ mutex_unlock(&vq->mutex);
+}
+
+static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
+{
+ pr_debug("%s: The handling func for control queue.\n", __func__);
+}
+
+static void
+vhost_scsi_send_evt(struct vhost_scsi *vs,
+ struct vhost_scsi_tpg *tpg,
+ struct se_lun *lun,
+ u32 event,
+ u32 reason)
+{
+ struct vhost_scsi_evt *evt;
+
+ evt = vhost_scsi_allocate_evt(vs, event, reason);
+ if (!evt)
+ return;
+
+ if (tpg && lun) {
+ /* TODO: share lun setup code with virtio-scsi.ko */
+ /*
+ * Note: evt->event is zeroed when we allocate it and
+ * lun[4-7] need to be zero according to virtio-scsi spec.
+ */
+ evt->event.lun[0] = 0x01;
+ evt->event.lun[1] = tpg->tport_tpgt;
+ if (lun->unpacked_lun >= 256)
+ evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
+ evt->event.lun[3] = lun->unpacked_lun & 0xFF;
+ }
+
+ llist_add(&evt->list, &vs->vs_event_list);
+ vhost_work_queue(&vs->dev, &vs->vs_event_work);
+}
+
+static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
+{
+ struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
+ poll.work);
+ struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
+
+ mutex_lock(&vq->mutex);
+ if (!vq->private_data)
+ goto out;
+
+ if (vs->vs_events_missed)
+ vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
+out:
+ mutex_unlock(&vq->mutex);
+}
+
+static void vhost_scsi_handle_kick(struct vhost_work *work)
+{
+ struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
+ poll.work);
+ struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
+
+ vhost_scsi_handle_vq(vs, vq);
+}
+
+static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
+{
+ vhost_poll_flush(&vs->vqs[index].vq.poll);
+}
+
+/* Callers must hold dev mutex */
+static void vhost_scsi_flush(struct vhost_scsi *vs)
+{
+ struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ];
+ int i;
+
+ /* Init new inflight and remember the old inflight */
+ vhost_scsi_init_inflight(vs, old_inflight);
+
+ /*
+ * The inflight->kref was initialized to 1. We decrement it here to
+ * indicate the start of the flush operation so that it will reach 0
+ * when all the reqs are finished.
+ */
+ for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
+ kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight);
+
+ /* Flush both the vhost poll and vhost work */
+ for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
+ vhost_scsi_flush_vq(vs, i);
+ vhost_work_flush(&vs->dev, &vs->vs_completion_work);
+ vhost_work_flush(&vs->dev, &vs->vs_event_work);
+
+ /* Wait for all reqs issued before the flush to be finished */
+ for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
+ wait_for_completion(&old_inflight[i]->comp);
+}
+
+/*
+ * Called from vhost_scsi_ioctl() context to walk the list of available
+ * vhost_scsi_tpg with an active struct vhost_scsi_nexus
+ *
+ * The lock nesting rule is:
+ * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
+ */
+static int
+vhost_scsi_set_endpoint(struct vhost_scsi *vs,
+ struct vhost_scsi_target *t)
+{
+ struct se_portal_group *se_tpg;
+ struct vhost_scsi_tport *tv_tport;
+ struct vhost_scsi_tpg *tpg;
+ struct vhost_scsi_tpg **vs_tpg;
+ struct vhost_virtqueue *vq;
+ int index, ret, i, len;
+ bool match = false;
+
+ mutex_lock(&vhost_scsi_mutex);
+ mutex_lock(&vs->dev.mutex);
+
+ /* Verify that ring has been setup correctly. */
+ for (index = 0; index < vs->dev.nvqs; ++index) {
+ /* Verify that ring has been setup correctly. */
+ if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
+ ret = -EFAULT;
+ goto out;
+ }
+ }
+
+ len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
+ vs_tpg = kzalloc(len, GFP_KERNEL);
+ if (!vs_tpg) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ if (vs->vs_tpg)
+ memcpy(vs_tpg, vs->vs_tpg, len);
+
+ list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) {
+ mutex_lock(&tpg->tv_tpg_mutex);
+ if (!tpg->tpg_nexus) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ continue;
+ }
+ if (tpg->tv_tpg_vhost_count != 0) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ continue;
+ }
+ tv_tport = tpg->tport;
+
+ if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
+ if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {
+ kfree(vs_tpg);
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ ret = -EEXIST;
+ goto out;
+ }
+ /*
+ * In order to ensure individual vhost-scsi configfs
+ * groups cannot be removed while in use by vhost ioctl,
+ * go ahead and take an explicit se_tpg->tpg_group.cg_item
+ * dependency now.
+ */
+ se_tpg = &tpg->se_tpg;
+ ret = target_depend_item(&se_tpg->tpg_group.cg_item);
+ if (ret) {
+ pr_warn("configfs_depend_item() failed: %d\n", ret);
+ kfree(vs_tpg);
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ goto out;
+ }
+ tpg->tv_tpg_vhost_count++;
+ tpg->vhost_scsi = vs;
+ vs_tpg[tpg->tport_tpgt] = tpg;
+ smp_mb__after_atomic();
+ match = true;
+ }
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ }
+
+ if (match) {
+ memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
+ sizeof(vs->vs_vhost_wwpn));
+ for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
+ vq = &vs->vqs[i].vq;
+ mutex_lock(&vq->mutex);
+ vq->private_data = vs_tpg;
+ vhost_vq_init_access(vq);
+ mutex_unlock(&vq->mutex);
+ }
+ ret = 0;
+ } else {
+ ret = -EEXIST;
+ }
+
+ /*
+ * Act as synchronize_rcu to make sure access to
+ * old vs->vs_tpg is finished.
+ */
+ vhost_scsi_flush(vs);
+ kfree(vs->vs_tpg);
+ vs->vs_tpg = vs_tpg;
+
+out:
+ mutex_unlock(&vs->dev.mutex);
+ mutex_unlock(&vhost_scsi_mutex);
+ return ret;
+}
+
+static int
+vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
+ struct vhost_scsi_target *t)
+{
+ struct se_portal_group *se_tpg;
+ struct vhost_scsi_tport *tv_tport;
+ struct vhost_scsi_tpg *tpg;
+ struct vhost_virtqueue *vq;
+ bool match = false;
+ int index, ret, i;
+ u8 target;
+
+ mutex_lock(&vhost_scsi_mutex);
+ mutex_lock(&vs->dev.mutex);
+ /* Verify that ring has been setup correctly. */
+ for (index = 0; index < vs->dev.nvqs; ++index) {
+ if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
+ ret = -EFAULT;
+ goto err_dev;
+ }
+ }
+
+ if (!vs->vs_tpg) {
+ ret = 0;
+ goto err_dev;
+ }
+
+ for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
+ target = i;
+ tpg = vs->vs_tpg[target];
+ if (!tpg)
+ continue;
+
+ mutex_lock(&tpg->tv_tpg_mutex);
+ tv_tport = tpg->tport;
+ if (!tv_tport) {
+ ret = -ENODEV;
+ goto err_tpg;
+ }
+
+ if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
+ pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
+ " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
+ tv_tport->tport_name, tpg->tport_tpgt,
+ t->vhost_wwpn, t->vhost_tpgt);
+ ret = -EINVAL;
+ goto err_tpg;
+ }
+ tpg->tv_tpg_vhost_count--;
+ tpg->vhost_scsi = NULL;
+ vs->vs_tpg[target] = NULL;
+ match = true;
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ /*
+ * Release se_tpg->tpg_group.cg_item configfs dependency now
+ * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur.
+ */
+ se_tpg = &tpg->se_tpg;
+ target_undepend_item(&se_tpg->tpg_group.cg_item);
+ }
+ if (match) {
+ for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
+ vq = &vs->vqs[i].vq;
+ mutex_lock(&vq->mutex);
+ vq->private_data = NULL;
+ mutex_unlock(&vq->mutex);
+ }
+ }
+ /*
+ * Act as synchronize_rcu to make sure access to
+ * old vs->vs_tpg is finished.
+ */
+ vhost_scsi_flush(vs);
+ kfree(vs->vs_tpg);
+ vs->vs_tpg = NULL;
+ WARN_ON(vs->vs_events_nr);
+ mutex_unlock(&vs->dev.mutex);
+ mutex_unlock(&vhost_scsi_mutex);
+ return 0;
+
+err_tpg:
+ mutex_unlock(&tpg->tv_tpg_mutex);
+err_dev:
+ mutex_unlock(&vs->dev.mutex);
+ mutex_unlock(&vhost_scsi_mutex);
+ return ret;
+}
+
+static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
+{
+ struct vhost_virtqueue *vq;
+ int i;
+
+ if (features & ~VHOST_SCSI_FEATURES)
+ return -EOPNOTSUPP;
+
+ mutex_lock(&vs->dev.mutex);
+ if ((features & (1 << VHOST_F_LOG_ALL)) &&
+ !vhost_log_access_ok(&vs->dev)) {
+ mutex_unlock(&vs->dev.mutex);
+ return -EFAULT;
+ }
+
+ for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
+ vq = &vs->vqs[i].vq;
+ mutex_lock(&vq->mutex);
+ vq->acked_features = features;
+ mutex_unlock(&vq->mutex);
+ }
+ mutex_unlock(&vs->dev.mutex);
+ return 0;
+}
+
+static int vhost_scsi_open(struct inode *inode, struct file *f)
+{
+ struct vhost_scsi *vs;
+ struct vhost_virtqueue **vqs;
+ int r = -ENOMEM, i;
+
+ vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_RETRY_MAYFAIL);
+ if (!vs) {
+ vs = vzalloc(sizeof(*vs));
+ if (!vs)
+ goto err_vs;
+ }
+
+ vqs = kmalloc_array(VHOST_SCSI_MAX_VQ, sizeof(*vqs), GFP_KERNEL);
+ if (!vqs)
+ goto err_vqs;
+
+ vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work);
+ vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work);
+
+ vs->vs_events_nr = 0;
+ vs->vs_events_missed = false;
+
+ vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
+ vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
+ vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
+ vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
+ for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
+ vqs[i] = &vs->vqs[i].vq;
+ vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
+ }
+ vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ);
+
+ vhost_scsi_init_inflight(vs, NULL);
+
+ f->private_data = vs;
+ return 0;
+
+err_vqs:
+ kvfree(vs);
+err_vs:
+ return r;
+}
+
+static int vhost_scsi_release(struct inode *inode, struct file *f)
+{
+ struct vhost_scsi *vs = f->private_data;
+ struct vhost_scsi_target t;
+
+ mutex_lock(&vs->dev.mutex);
+ memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
+ mutex_unlock(&vs->dev.mutex);
+ vhost_scsi_clear_endpoint(vs, &t);
+ vhost_dev_stop(&vs->dev);
+ vhost_dev_cleanup(&vs->dev);
+ /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
+ vhost_scsi_flush(vs);
+ kfree(vs->dev.vqs);
+ kvfree(vs);
+ return 0;
+}
+
+static long
+vhost_scsi_ioctl(struct file *f,
+ unsigned int ioctl,
+ unsigned long arg)
+{
+ struct vhost_scsi *vs = f->private_data;
+ struct vhost_scsi_target backend;
+ void __user *argp = (void __user *)arg;
+ u64 __user *featurep = argp;
+ u32 __user *eventsp = argp;
+ u32 events_missed;
+ u64 features;
+ int r, abi_version = VHOST_SCSI_ABI_VERSION;
+ struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
+
+ switch (ioctl) {
+ case VHOST_SCSI_SET_ENDPOINT:
+ if (copy_from_user(&backend, argp, sizeof backend))
+ return -EFAULT;
+ if (backend.reserved != 0)
+ return -EOPNOTSUPP;
+
+ return vhost_scsi_set_endpoint(vs, &backend);
+ case VHOST_SCSI_CLEAR_ENDPOINT:
+ if (copy_from_user(&backend, argp, sizeof backend))
+ return -EFAULT;
+ if (backend.reserved != 0)
+ return -EOPNOTSUPP;
+
+ return vhost_scsi_clear_endpoint(vs, &backend);
+ case VHOST_SCSI_GET_ABI_VERSION:
+ if (copy_to_user(argp, &abi_version, sizeof abi_version))
+ return -EFAULT;
+ return 0;
+ case VHOST_SCSI_SET_EVENTS_MISSED:
+ if (get_user(events_missed, eventsp))
+ return -EFAULT;
+ mutex_lock(&vq->mutex);
+ vs->vs_events_missed = events_missed;
+ mutex_unlock(&vq->mutex);
+ return 0;
+ case VHOST_SCSI_GET_EVENTS_MISSED:
+ mutex_lock(&vq->mutex);
+ events_missed = vs->vs_events_missed;
+ mutex_unlock(&vq->mutex);
+ if (put_user(events_missed, eventsp))
+ return -EFAULT;
+ return 0;
+ case VHOST_GET_FEATURES:
+ features = VHOST_SCSI_FEATURES;
+ if (copy_to_user(featurep, &features, sizeof features))
+ return -EFAULT;
+ return 0;
+ case VHOST_SET_FEATURES:
+ if (copy_from_user(&features, featurep, sizeof features))
+ return -EFAULT;
+ return vhost_scsi_set_features(vs, features);
+ default:
+ mutex_lock(&vs->dev.mutex);
+ r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
+ /* TODO: flush backend after dev ioctl. */
+ if (r == -ENOIOCTLCMD)
+ r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
+ mutex_unlock(&vs->dev.mutex);
+ return r;
+ }
+}
+
+#ifdef CONFIG_COMPAT
+static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
+ unsigned long arg)
+{
+ return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
+}
+#endif
+
+static const struct file_operations vhost_scsi_fops = {
+ .owner = THIS_MODULE,
+ .release = vhost_scsi_release,
+ .unlocked_ioctl = vhost_scsi_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = vhost_scsi_compat_ioctl,
+#endif
+ .open = vhost_scsi_open,
+ .llseek = noop_llseek,
+};
+
+static struct miscdevice vhost_scsi_misc = {
+ MISC_DYNAMIC_MINOR,
+ "vhost-scsi",
+ &vhost_scsi_fops,
+};
+
+static int __init vhost_scsi_register(void)
+{
+ return misc_register(&vhost_scsi_misc);
+}
+
+static void vhost_scsi_deregister(void)
+{
+ misc_deregister(&vhost_scsi_misc);
+}
+
+static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport)
+{
+ switch (tport->tport_proto_id) {
+ case SCSI_PROTOCOL_SAS:
+ return "SAS";
+ case SCSI_PROTOCOL_FCP:
+ return "FCP";
+ case SCSI_PROTOCOL_ISCSI:
+ return "iSCSI";
+ default:
+ break;
+ }
+
+ return "Unknown";
+}
+
+static void
+vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg,
+ struct se_lun *lun, bool plug)
+{
+
+ struct vhost_scsi *vs = tpg->vhost_scsi;
+ struct vhost_virtqueue *vq;
+ u32 reason;
+
+ if (!vs)
+ return;
+
+ mutex_lock(&vs->dev.mutex);
+
+ if (plug)
+ reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
+ else
+ reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
+
+ vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
+ mutex_lock(&vq->mutex);
+ if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG))
+ vhost_scsi_send_evt(vs, tpg, lun,
+ VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
+ mutex_unlock(&vq->mutex);
+ mutex_unlock(&vs->dev.mutex);
+}
+
+static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
+{
+ vhost_scsi_do_plug(tpg, lun, true);
+}
+
+static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
+{
+ vhost_scsi_do_plug(tpg, lun, false);
+}
+
+static int vhost_scsi_port_link(struct se_portal_group *se_tpg,
+ struct se_lun *lun)
+{
+ struct vhost_scsi_tpg *tpg = container_of(se_tpg,
+ struct vhost_scsi_tpg, se_tpg);
+
+ mutex_lock(&vhost_scsi_mutex);
+
+ mutex_lock(&tpg->tv_tpg_mutex);
+ tpg->tv_tpg_port_count++;
+ mutex_unlock(&tpg->tv_tpg_mutex);
+
+ vhost_scsi_hotplug(tpg, lun);
+
+ mutex_unlock(&vhost_scsi_mutex);
+
+ return 0;
+}
+
+static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg,
+ struct se_lun *lun)
+{
+ struct vhost_scsi_tpg *tpg = container_of(se_tpg,
+ struct vhost_scsi_tpg, se_tpg);
+
+ mutex_lock(&vhost_scsi_mutex);
+
+ mutex_lock(&tpg->tv_tpg_mutex);
+ tpg->tv_tpg_port_count--;
+ mutex_unlock(&tpg->tv_tpg_mutex);
+
+ vhost_scsi_hotunplug(tpg, lun);
+
+ mutex_unlock(&vhost_scsi_mutex);
+}
+
+static void vhost_scsi_free_cmd_map_res(struct se_session *se_sess)
+{
+ struct vhost_scsi_cmd *tv_cmd;
+ unsigned int i;
+
+ if (!se_sess->sess_cmd_map)
+ return;
+
+ for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
+ tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
+
+ kfree(tv_cmd->tvc_sgl);
+ kfree(tv_cmd->tvc_prot_sgl);
+ kfree(tv_cmd->tvc_upages);
+ }
+}
+
+static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store(
+ struct config_item *item, const char *page, size_t count)
+{
+ struct se_portal_group *se_tpg = attrib_to_tpg(item);
+ struct vhost_scsi_tpg *tpg = container_of(se_tpg,
+ struct vhost_scsi_tpg, se_tpg);
+ unsigned long val;
+ int ret = kstrtoul(page, 0, &val);
+
+ if (ret) {
+ pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
+ return ret;
+ }
+ if (val != 0 && val != 1 && val != 3) {
+ pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val);
+ return -EINVAL;
+ }
+ tpg->tv_fabric_prot_type = val;
+
+ return count;
+}
+
+static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show(
+ struct config_item *item, char *page)
+{
+ struct se_portal_group *se_tpg = attrib_to_tpg(item);
+ struct vhost_scsi_tpg *tpg = container_of(se_tpg,
+ struct vhost_scsi_tpg, se_tpg);
+
+ return sprintf(page, "%d\n", tpg->tv_fabric_prot_type);
+}
+
+CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type);
+
+static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = {
+ &vhost_scsi_tpg_attrib_attr_fabric_prot_type,
+ NULL,
+};
+
+static int vhost_scsi_nexus_cb(struct se_portal_group *se_tpg,
+ struct se_session *se_sess, void *p)
+{
+ struct vhost_scsi_cmd *tv_cmd;
+ unsigned int i;
+
+ for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
+ tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
+
+ tv_cmd->tvc_sgl = kcalloc(VHOST_SCSI_PREALLOC_SGLS,
+ sizeof(struct scatterlist),
+ GFP_KERNEL);
+ if (!tv_cmd->tvc_sgl) {
+ pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
+ goto out;
+ }
+
+ tv_cmd->tvc_upages = kcalloc(VHOST_SCSI_PREALLOC_UPAGES,
+ sizeof(struct page *),
+ GFP_KERNEL);
+ if (!tv_cmd->tvc_upages) {
+ pr_err("Unable to allocate tv_cmd->tvc_upages\n");
+ goto out;
+ }
+
+ tv_cmd->tvc_prot_sgl = kcalloc(VHOST_SCSI_PREALLOC_PROT_SGLS,
+ sizeof(struct scatterlist),
+ GFP_KERNEL);
+ if (!tv_cmd->tvc_prot_sgl) {
+ pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
+ goto out;
+ }
+ }
+ return 0;
+out:
+ vhost_scsi_free_cmd_map_res(se_sess);
+ return -ENOMEM;
+}
+
+static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
+ const char *name)
+{
+ struct vhost_scsi_nexus *tv_nexus;
+
+ mutex_lock(&tpg->tv_tpg_mutex);
+ if (tpg->tpg_nexus) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ pr_debug("tpg->tpg_nexus already exists\n");
+ return -EEXIST;
+ }
+
+ tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
+ if (!tv_nexus) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ pr_err("Unable to allocate struct vhost_scsi_nexus\n");
+ return -ENOMEM;
+ }
+ /*
+ * Since we are running in 'demo mode' this call with generate a
+ * struct se_node_acl for the vhost_scsi struct se_portal_group with
+ * the SCSI Initiator port name of the passed configfs group 'name'.
+ */
+ tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg,
+ VHOST_SCSI_DEFAULT_TAGS,
+ sizeof(struct vhost_scsi_cmd),
+ TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
+ (unsigned char *)name, tv_nexus,
+ vhost_scsi_nexus_cb);
+ if (IS_ERR(tv_nexus->tvn_se_sess)) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ kfree(tv_nexus);
+ return -ENOMEM;
+ }
+ tpg->tpg_nexus = tv_nexus;
+
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ return 0;
+}
+
+static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
+{
+ struct se_session *se_sess;
+ struct vhost_scsi_nexus *tv_nexus;
+
+ mutex_lock(&tpg->tv_tpg_mutex);
+ tv_nexus = tpg->tpg_nexus;
+ if (!tv_nexus) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ return -ENODEV;
+ }
+
+ se_sess = tv_nexus->tvn_se_sess;
+ if (!se_sess) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ return -ENODEV;
+ }
+
+ if (tpg->tv_tpg_port_count != 0) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ pr_err("Unable to remove TCM_vhost I_T Nexus with"
+ " active TPG port count: %d\n",
+ tpg->tv_tpg_port_count);
+ return -EBUSY;
+ }
+
+ if (tpg->tv_tpg_vhost_count != 0) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ pr_err("Unable to remove TCM_vhost I_T Nexus with"
+ " active TPG vhost count: %d\n",
+ tpg->tv_tpg_vhost_count);
+ return -EBUSY;
+ }
+
+ pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
+ " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport),
+ tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
+
+ vhost_scsi_free_cmd_map_res(se_sess);
+ /*
+ * Release the SCSI I_T Nexus to the emulated vhost Target Port
+ */
+ target_remove_session(se_sess);
+ tpg->tpg_nexus = NULL;
+ mutex_unlock(&tpg->tv_tpg_mutex);
+
+ kfree(tv_nexus);
+ return 0;
+}
+
+static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page)
+{
+ struct se_portal_group *se_tpg = to_tpg(item);
+ struct vhost_scsi_tpg *tpg = container_of(se_tpg,
+ struct vhost_scsi_tpg, se_tpg);
+ struct vhost_scsi_nexus *tv_nexus;
+ ssize_t ret;
+
+ mutex_lock(&tpg->tv_tpg_mutex);
+ tv_nexus = tpg->tpg_nexus;
+ if (!tv_nexus) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ return -ENODEV;
+ }
+ ret = snprintf(page, PAGE_SIZE, "%s\n",
+ tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
+ mutex_unlock(&tpg->tv_tpg_mutex);
+
+ return ret;
+}
+
+static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct se_portal_group *se_tpg = to_tpg(item);
+ struct vhost_scsi_tpg *tpg = container_of(se_tpg,
+ struct vhost_scsi_tpg, se_tpg);
+ struct vhost_scsi_tport *tport_wwn = tpg->tport;
+ unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr;
+ int ret;
+ /*
+ * Shutdown the active I_T nexus if 'NULL' is passed..
+ */
+ if (!strncmp(page, "NULL", 4)) {
+ ret = vhost_scsi_drop_nexus(tpg);
+ return (!ret) ? count : ret;
+ }
+ /*
+ * Otherwise make sure the passed virtual Initiator port WWN matches
+ * the fabric protocol_id set in vhost_scsi_make_tport(), and call
+ * vhost_scsi_make_nexus().
+ */
+ if (strlen(page) >= VHOST_SCSI_NAMELEN) {
+ pr_err("Emulated NAA Sas Address: %s, exceeds"
+ " max: %d\n", page, VHOST_SCSI_NAMELEN);
+ return -EINVAL;
+ }
+ snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page);
+
+ ptr = strstr(i_port, "naa.");
+ if (ptr) {
+ if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
+ pr_err("Passed SAS Initiator Port %s does not"
+ " match target port protoid: %s\n", i_port,
+ vhost_scsi_dump_proto_id(tport_wwn));
+ return -EINVAL;
+ }
+ port_ptr = &i_port[0];
+ goto check_newline;
+ }
+ ptr = strstr(i_port, "fc.");
+ if (ptr) {
+ if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
+ pr_err("Passed FCP Initiator Port %s does not"
+ " match target port protoid: %s\n", i_port,
+ vhost_scsi_dump_proto_id(tport_wwn));
+ return -EINVAL;
+ }
+ port_ptr = &i_port[3]; /* Skip over "fc." */
+ goto check_newline;
+ }
+ ptr = strstr(i_port, "iqn.");
+ if (ptr) {
+ if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
+ pr_err("Passed iSCSI Initiator Port %s does not"
+ " match target port protoid: %s\n", i_port,
+ vhost_scsi_dump_proto_id(tport_wwn));
+ return -EINVAL;
+ }
+ port_ptr = &i_port[0];
+ goto check_newline;
+ }
+ pr_err("Unable to locate prefix for emulated Initiator Port:"
+ " %s\n", i_port);
+ return -EINVAL;
+ /*
+ * Clear any trailing newline for the NAA WWN
+ */
+check_newline:
+ if (i_port[strlen(i_port)-1] == '\n')
+ i_port[strlen(i_port)-1] = '\0';
+
+ ret = vhost_scsi_make_nexus(tpg, port_ptr);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+CONFIGFS_ATTR(vhost_scsi_tpg_, nexus);
+
+static struct configfs_attribute *vhost_scsi_tpg_attrs[] = {
+ &vhost_scsi_tpg_attr_nexus,
+ NULL,
+};
+
+static struct se_portal_group *
+vhost_scsi_make_tpg(struct se_wwn *wwn, const char *name)
+{
+ struct vhost_scsi_tport *tport = container_of(wwn,
+ struct vhost_scsi_tport, tport_wwn);
+
+ struct vhost_scsi_tpg *tpg;
+ u16 tpgt;
+ int ret;
+
+ if (strstr(name, "tpgt_") != name)
+ return ERR_PTR(-EINVAL);
+ if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET)
+ return ERR_PTR(-EINVAL);
+
+ tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
+ if (!tpg) {
+ pr_err("Unable to allocate struct vhost_scsi_tpg");
+ return ERR_PTR(-ENOMEM);
+ }
+ mutex_init(&tpg->tv_tpg_mutex);
+ INIT_LIST_HEAD(&tpg->tv_tpg_list);
+ tpg->tport = tport;
+ tpg->tport_tpgt = tpgt;
+
+ ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id);
+ if (ret < 0) {
+ kfree(tpg);
+ return NULL;
+ }
+ mutex_lock(&vhost_scsi_mutex);
+ list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list);
+ mutex_unlock(&vhost_scsi_mutex);
+
+ return &tpg->se_tpg;
+}
+
+static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg)
+{
+ struct vhost_scsi_tpg *tpg = container_of(se_tpg,
+ struct vhost_scsi_tpg, se_tpg);
+
+ mutex_lock(&vhost_scsi_mutex);
+ list_del(&tpg->tv_tpg_list);
+ mutex_unlock(&vhost_scsi_mutex);
+ /*
+ * Release the virtual I_T Nexus for this vhost TPG
+ */
+ vhost_scsi_drop_nexus(tpg);
+ /*
+ * Deregister the se_tpg from TCM..
+ */
+ core_tpg_deregister(se_tpg);
+ kfree(tpg);
+}
+
+static struct se_wwn *
+vhost_scsi_make_tport(struct target_fabric_configfs *tf,
+ struct config_group *group,
+ const char *name)
+{
+ struct vhost_scsi_tport *tport;
+ char *ptr;
+ u64 wwpn = 0;
+ int off = 0;
+
+ /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0)
+ return ERR_PTR(-EINVAL); */
+
+ tport = kzalloc(sizeof(*tport), GFP_KERNEL);
+ if (!tport) {
+ pr_err("Unable to allocate struct vhost_scsi_tport");
+ return ERR_PTR(-ENOMEM);
+ }
+ tport->tport_wwpn = wwpn;
+ /*
+ * Determine the emulated Protocol Identifier and Target Port Name
+ * based on the incoming configfs directory name.
+ */
+ ptr = strstr(name, "naa.");
+ if (ptr) {
+ tport->tport_proto_id = SCSI_PROTOCOL_SAS;
+ goto check_len;
+ }
+ ptr = strstr(name, "fc.");
+ if (ptr) {
+ tport->tport_proto_id = SCSI_PROTOCOL_FCP;
+ off = 3; /* Skip over "fc." */
+ goto check_len;
+ }
+ ptr = strstr(name, "iqn.");
+ if (ptr) {
+ tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
+ goto check_len;
+ }
+
+ pr_err("Unable to locate prefix for emulated Target Port:"
+ " %s\n", name);
+ kfree(tport);
+ return ERR_PTR(-EINVAL);
+
+check_len:
+ if (strlen(name) >= VHOST_SCSI_NAMELEN) {
+ pr_err("Emulated %s Address: %s, exceeds"
+ " max: %d\n", name, vhost_scsi_dump_proto_id(tport),
+ VHOST_SCSI_NAMELEN);
+ kfree(tport);
+ return ERR_PTR(-EINVAL);
+ }
+ snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]);
+
+ pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
+ " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name);
+
+ return &tport->tport_wwn;
+}
+
+static void vhost_scsi_drop_tport(struct se_wwn *wwn)
+{
+ struct vhost_scsi_tport *tport = container_of(wwn,
+ struct vhost_scsi_tport, tport_wwn);
+
+ pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
+ " %s Address: %s\n", vhost_scsi_dump_proto_id(tport),
+ tport->tport_name);
+
+ kfree(tport);
+}
+
+static ssize_t
+vhost_scsi_wwn_version_show(struct config_item *item, char *page)
+{
+ return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
+ "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
+ utsname()->machine);
+}
+
+CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version);
+
+static struct configfs_attribute *vhost_scsi_wwn_attrs[] = {
+ &vhost_scsi_wwn_attr_version,
+ NULL,
+};
+
+static const struct target_core_fabric_ops vhost_scsi_ops = {
+ .module = THIS_MODULE,
+ .name = "vhost",
+ .get_fabric_name = vhost_scsi_get_fabric_name,
+ .tpg_get_wwn = vhost_scsi_get_fabric_wwn,
+ .tpg_get_tag = vhost_scsi_get_tpgt,
+ .tpg_check_demo_mode = vhost_scsi_check_true,
+ .tpg_check_demo_mode_cache = vhost_scsi_check_true,
+ .tpg_check_demo_mode_write_protect = vhost_scsi_check_false,
+ .tpg_check_prod_mode_write_protect = vhost_scsi_check_false,
+ .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only,
+ .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index,
+ .release_cmd = vhost_scsi_release_cmd,
+ .check_stop_free = vhost_scsi_check_stop_free,
+ .sess_get_index = vhost_scsi_sess_get_index,
+ .sess_get_initiator_sid = NULL,
+ .write_pending = vhost_scsi_write_pending,
+ .write_pending_status = vhost_scsi_write_pending_status,
+ .set_default_node_attributes = vhost_scsi_set_default_node_attrs,
+ .get_cmd_state = vhost_scsi_get_cmd_state,
+ .queue_data_in = vhost_scsi_queue_data_in,
+ .queue_status = vhost_scsi_queue_status,
+ .queue_tm_rsp = vhost_scsi_queue_tm_rsp,
+ .aborted_task = vhost_scsi_aborted_task,
+ /*
+ * Setup callers for generic logic in target_core_fabric_configfs.c
+ */
+ .fabric_make_wwn = vhost_scsi_make_tport,
+ .fabric_drop_wwn = vhost_scsi_drop_tport,
+ .fabric_make_tpg = vhost_scsi_make_tpg,
+ .fabric_drop_tpg = vhost_scsi_drop_tpg,
+ .fabric_post_link = vhost_scsi_port_link,
+ .fabric_pre_unlink = vhost_scsi_port_unlink,
+
+ .tfc_wwn_attrs = vhost_scsi_wwn_attrs,
+ .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs,
+ .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs,
+};
+
+static int __init vhost_scsi_init(void)
+{
+ int ret = -ENOMEM;
+
+ pr_debug("TCM_VHOST fabric module %s on %s/%s"
+ " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
+ utsname()->machine);
+
+ /*
+ * Use our own dedicated workqueue for submitting I/O into
+ * target core to avoid contention within system_wq.
+ */
+ vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0);
+ if (!vhost_scsi_workqueue)
+ goto out;
+
+ ret = vhost_scsi_register();
+ if (ret < 0)
+ goto out_destroy_workqueue;
+
+ ret = target_register_template(&vhost_scsi_ops);
+ if (ret < 0)
+ goto out_vhost_scsi_deregister;
+
+ return 0;
+
+out_vhost_scsi_deregister:
+ vhost_scsi_deregister();
+out_destroy_workqueue:
+ destroy_workqueue(vhost_scsi_workqueue);
+out:
+ return ret;
+};
+
+static void vhost_scsi_exit(void)
+{
+ target_unregister_template(&vhost_scsi_ops);
+ vhost_scsi_deregister();
+ destroy_workqueue(vhost_scsi_workqueue);
+};
+
+MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
+MODULE_ALIAS("tcm_vhost");
+MODULE_LICENSE("GPL");
+module_init(vhost_scsi_init);
+module_exit(vhost_scsi_exit);