Commit 057cbf49 authored by Nicholas Bellinger's avatar Nicholas Bellinger

tcm_vhost: Initial merge for vhost level target fabric driver

This patch adds the initial code for tcm_vhost, a Vhost level TCM
fabric driver for virtio SCSI initiators into KVM guest.

This code is currently up and running on v3.5-rc2 host+guest
from target-pending/for-next-merge.

Using tcm_vhost requires Zhi's -> Stefan -> nab's qemu vhost-scsi tree here:

  http://git.kernel.org/?p=virt/kvm/nab/qemu-kvm.git;a=shortlog;h=refs/heads/vhost-scsi

--

Changelog v4 -> v5:

  Expose ABI version via VHOST_SCSI_GET_ABI_VERSION + use Rev 0 as
  starting point for v3.6-rc code (Stefan + ALiguori + nab)
  Convert vhost_scsi_handle_vq() to vq_err() (nab + MST)
  Minor style fixes from checkpatch (nab)

Changelog v3 -> v4:

  Rename vhost_vring_target -> vhost_scsi_target (mst + nab)
  Use TRANSPORT_IQN_LEN in vhost_scsi_target->vhost_wwpn[] def (nab)
  Move back to drivers/vhost/, and just use drivers/vhost/Kconfig.tcm (mst)
  Move TCM_VHOST related ioctl defines from include/linux/vhost.h ->
  drivers/vhost/tcm_vhost.h as requested by MST (nab)
  Move Kbuild.tcm include from drivers/staging -> drivers/vhost/, and
  just use 'if STAGING' around 'source drivers/vhost/Kbuild.tcm'

Changelog v2 -> v3:

  Unlock on error in tcm_vhost_drop_nexus() (DanC)
  Fix strlen() doesn't count the terminator (DanC)
  Call kfree() on an error path (DanC)
  Convert tcm_vhost_write_pending to use target_execute_cmd (hch + nab)
  Fix another strlen() off by one in tcm_vhost_make_tport (DanC)
  Add option under drivers/staging/Kconfig, and move to drivers/vhost/tcm/
  as requested by MST (nab)

Changelog v1 -> v2:

  Fix tv_cmd completion -> release SGL memory leak (nab)
  Fix sparse warnings for static variable usage ((Fengguang Wu)
  Fix sparse warnings for min() typing + printk format specs (Fengguang Wu)
  Convert to cmwq submission for I/O dispatch (nab + hch)

Changelog v0 -> v1:

  Merge into single source + header file, and move to drivers/vhost/
Acked-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>
Cc: Zhi Yong Wu <wuzhy@cn.ibm.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent bdc0077a
......@@ -9,3 +9,6 @@ config VHOST_NET
To compile this driver as a module, choose M here: the module will
be called vhost_net.
if STAGING
source "drivers/vhost/Kconfig.tcm"
endif
config TCM_VHOST
tristate "TCM_VHOST fabric module (EXPERIMENTAL)"
depends on TARGET_CORE && EVENTFD && EXPERIMENTAL && m
default n
---help---
Say M here to enable the TCM_VHOST fabric module for use with virtio-scsi guests
obj-$(CONFIG_VHOST_NET) += vhost_net.o
vhost_net-y := vhost.o net.o
obj-$(CONFIG_TCM_VHOST) += tcm_vhost.o
/*******************************************************************************
* Vhost kernel TCM fabric driver for virtio SCSI initiators
*
* (C) Copyright 2010-2012 RisingTide Systems LLC.
* (C) Copyright 2010-2012 IBM Corp.
*
* Licensed to the Linux Foundation under the General Public License (GPL) version 2.
*
* Authors: Nicholas A. Bellinger <nab@risingtidesystems.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/vhost.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_tcq.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include <target/target_core_fabric_configfs.h>
#include <target/target_core_configfs.h>
#include <target/configfs_macros.h>
#include <linux/vhost.h>
#include <linux/virtio_net.h> /* TODO vhost.h currently depends on this */
#include <linux/virtio_scsi.h>
#include "vhost.c"
#include "vhost.h"
#include "tcm_vhost.h"
struct vhost_scsi {
atomic_t vhost_ref_cnt;
struct tcm_vhost_tpg *vs_tpg;
struct vhost_dev dev;
struct vhost_virtqueue vqs[3];
struct vhost_work vs_completion_work; /* cmd completion work item */
struct list_head vs_completion_list; /* cmd completion queue */
spinlock_t vs_completion_lock; /* protects s_completion_list */
};
/* Local pointer to allocated TCM configfs fabric module */
static struct target_fabric_configfs *tcm_vhost_fabric_configfs;
static struct workqueue_struct *tcm_vhost_workqueue;
/* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */
static DEFINE_MUTEX(tcm_vhost_mutex);
static LIST_HEAD(tcm_vhost_list);
static int tcm_vhost_check_true(struct se_portal_group *se_tpg)
{
return 1;
}
static int tcm_vhost_check_false(struct se_portal_group *se_tpg)
{
return 0;
}
static char *tcm_vhost_get_fabric_name(void)
{
return "vhost";
}
static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg)
{
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
struct tcm_vhost_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 *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg)
{
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
struct tcm_vhost_tport *tport = tpg->tport;
return &tport->tport_name[0];
}
static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg)
{
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
return tpg->tport_tpgt;
}
static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg)
{
return 1;
}
static u32 tcm_vhost_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 tcm_vhost_tpg *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
struct tcm_vhost_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 tcm_vhost_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 tcm_vhost_tpg *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
struct tcm_vhost_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 *tcm_vhost_parse_pr_out_transport_id(
struct se_portal_group *se_tpg,
const char *buf,
u32 *out_tid_len,
char **port_nexus_ptr)
{
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
struct tcm_vhost_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_node_acl *tcm_vhost_alloc_fabric_acl(
struct se_portal_group *se_tpg)
{
struct tcm_vhost_nacl *nacl;
nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL);
if (!nacl) {
pr_err("Unable to alocate struct tcm_vhost_nacl\n");
return NULL;
}
return &nacl->se_node_acl;
}
static void tcm_vhost_release_fabric_acl(
struct se_portal_group *se_tpg,
struct se_node_acl *se_nacl)
{
struct tcm_vhost_nacl *nacl = container_of(se_nacl,
struct tcm_vhost_nacl, se_node_acl);
kfree(nacl);
}
static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg)
{
return 1;
}
static void tcm_vhost_release_cmd(struct se_cmd *se_cmd)
{
return;
}
static int tcm_vhost_shutdown_session(struct se_session *se_sess)
{
return 0;
}
static void tcm_vhost_close_session(struct se_session *se_sess)
{
return;
}
static u32 tcm_vhost_sess_get_index(struct se_session *se_sess)
{
return 0;
}
static int tcm_vhost_write_pending(struct se_cmd *se_cmd)
{
/* Go ahead and process the write immediately */
target_execute_cmd(se_cmd);
return 0;
}
static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd)
{
return 0;
}
static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl)
{
return;
}
static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd)
{
return 0;
}
static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd)
{
return 0;
}
static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *);
static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd)
{
struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
struct tcm_vhost_cmd, tvc_se_cmd);
vhost_scsi_complete_cmd(tv_cmd);
return 0;
}
static int tcm_vhost_queue_status(struct se_cmd *se_cmd)
{
struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
struct tcm_vhost_cmd, tvc_se_cmd);
vhost_scsi_complete_cmd(tv_cmd);
return 0;
}
static int tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd)
{
return 0;
}
static u16 tcm_vhost_set_fabric_sense_len(struct se_cmd *se_cmd,
u32 sense_length)
{
return 0;
}
static u16 tcm_vhost_get_fabric_sense_len(void)
{
return 0;
}
static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd)
{
struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
/* TODO locking against target/backend threads? */
transport_generic_free_cmd(se_cmd, 1);
if (tv_cmd->tvc_sgl_count) {
u32 i;
for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
put_page(sg_page(&tv_cmd->tvc_sgl[i]));
kfree(tv_cmd->tvc_sgl);
}
kfree(tv_cmd);
}
/* Dequeue a command from the completion list */
static struct tcm_vhost_cmd *vhost_scsi_get_cmd_from_completion(
struct vhost_scsi *vs)
{
struct tcm_vhost_cmd *tv_cmd = NULL;
spin_lock_bh(&vs->vs_completion_lock);
if (list_empty(&vs->vs_completion_list)) {
spin_unlock_bh(&vs->vs_completion_lock);
return NULL;
}
list_for_each_entry(tv_cmd, &vs->vs_completion_list,
tvc_completion_list) {
list_del(&tv_cmd->tvc_completion_list);
break;
}
spin_unlock_bh(&vs->vs_completion_lock);
return tv_cmd;
}
/* 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);
struct tcm_vhost_cmd *tv_cmd;
while ((tv_cmd = vhost_scsi_get_cmd_from_completion(vs)) != NULL) {
struct virtio_scsi_cmd_resp v_rsp;
struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
int ret;
pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
tv_cmd, se_cmd->residual_count, se_cmd->scsi_status);
memset(&v_rsp, 0, sizeof(v_rsp));
v_rsp.resid = se_cmd->residual_count;
/* TODO is status_qualifier field needed? */
v_rsp.status = se_cmd->scsi_status;
v_rsp.sense_len = se_cmd->scsi_sense_length;
memcpy(v_rsp.sense, tv_cmd->tvc_sense_buf,
v_rsp.sense_len);
ret = copy_to_user(tv_cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
if (likely(ret == 0))
vhost_add_used(&vs->vqs[2], tv_cmd->tvc_vq_desc, 0);
else
pr_err("Faulted on virtio_scsi_cmd_resp\n");
vhost_scsi_free_cmd(tv_cmd);
}
vhost_signal(&vs->dev, &vs->vqs[2]);
}
static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *tv_cmd)
{
struct vhost_scsi *vs = tv_cmd->tvc_vhost;
pr_debug("%s tv_cmd %p\n", __func__, tv_cmd);
spin_lock_bh(&vs->vs_completion_lock);
list_add_tail(&tv_cmd->tvc_completion_list, &vs->vs_completion_list);
spin_unlock_bh(&vs->vs_completion_lock);
vhost_work_queue(&vs->dev, &vs->vs_completion_work);
}
static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd(
struct tcm_vhost_tpg *tv_tpg,
struct virtio_scsi_cmd_req *v_req,
u32 exp_data_len,
int data_direction)
{
struct tcm_vhost_cmd *tv_cmd;
struct tcm_vhost_nexus *tv_nexus;
struct se_portal_group *se_tpg = &tv_tpg->se_tpg;
struct se_session *se_sess;
struct se_cmd *se_cmd;
int sam_task_attr;
tv_nexus = tv_tpg->tpg_nexus;
if (!tv_nexus) {
pr_err("Unable to locate active struct tcm_vhost_nexus\n");
return ERR_PTR(-EIO);
}
se_sess = tv_nexus->tvn_se_sess;
tv_cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC);
if (!tv_cmd) {
pr_err("Unable to allocate struct tcm_vhost_cmd\n");
return ERR_PTR(-ENOMEM);
}
INIT_LIST_HEAD(&tv_cmd->tvc_completion_list);
tv_cmd->tvc_tag = v_req->tag;
se_cmd = &tv_cmd->tvc_se_cmd;
/*
* Locate the SAM Task Attr from virtio_scsi_cmd_req
*/
sam_task_attr = v_req->task_attr;
/*
* Initialize struct se_cmd descriptor from TCM infrastructure
*/
transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, exp_data_len,
data_direction, sam_task_attr,
&tv_cmd->tvc_sense_buf[0]);
#if 0 /* FIXME: vhost_scsi_allocate_cmd() BIDI operation */
if (bidi)
se_cmd->se_cmd_flags |= SCF_BIDI;
#endif
return tv_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 scatterlist *sgl,
unsigned int sgl_count, void __user *ptr, size_t len, int write)
{
struct scatterlist *sg = sgl;
unsigned int npages = 0;
int ret;
while (len > 0) {
struct page *page;
unsigned int offset = (uintptr_t)ptr & ~PAGE_MASK;
unsigned int nbytes = min_t(unsigned int,
PAGE_SIZE - offset, len);
if (npages == sgl_count) {
ret = -ENOBUFS;
goto err;
}
ret = get_user_pages_fast((unsigned long)ptr, 1, write, &page);
BUG_ON(ret == 0); /* we should either get our page or fail */
if (ret < 0)
goto err;
sg_set_page(sg, page, nbytes, offset);
ptr += nbytes;
len -= nbytes;
sg++;
npages++;
}
return npages;
err:
/* Put pages that we hold */
for (sg = sgl; sg != &sgl[npages]; sg++)
put_page(sg_page(sg));
return ret;
}
static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *tv_cmd,
struct iovec *iov, unsigned int niov, int write)
{
int ret;
unsigned int i;
u32 sgl_count;
struct scatterlist *sg;
/*
* Find out how long sglist needs to be
*/
sgl_count = 0;
for (i = 0; i < niov; i++) {
sgl_count += (((uintptr_t)iov[i].iov_base + iov[i].iov_len +
PAGE_SIZE - 1) >> PAGE_SHIFT) -
((uintptr_t)iov[i].iov_base >> PAGE_SHIFT);
}
/* TODO overflow checking */
sg = kmalloc(sizeof(tv_cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC);
if (!sg)
return -ENOMEM;
pr_debug("%s sg %p sgl_count %u is_err %ld\n", __func__,
sg, sgl_count, IS_ERR(sg));
sg_init_table(sg, sgl_count);
tv_cmd->tvc_sgl = sg;
tv_cmd->tvc_sgl_count = sgl_count;
pr_debug("Mapping %u iovecs for %u pages\n", niov, sgl_count);
for (i = 0; i < niov; i++) {
ret = vhost_scsi_map_to_sgl(sg, sgl_count, iov[i].iov_base,
iov[i].iov_len, write);
if (ret < 0) {
for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
put_page(sg_page(&tv_cmd->tvc_sgl[i]));
kfree(tv_cmd->tvc_sgl);
tv_cmd->tvc_sgl = NULL;
tv_cmd->tvc_sgl_count = 0;
return ret;
}
sg += ret;
sgl_count -= ret;
}
return 0;
}
static void tcm_vhost_submission_work(struct work_struct *work)
{
struct tcm_vhost_cmd *tv_cmd =
container_of(work, struct tcm_vhost_cmd, work);
struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL;
int rc, sg_no_bidi = 0;
/*
* Locate the struct se_lun pointer based on v_req->lun, and
* attach it to struct se_cmd
*/
rc = transport_lookup_cmd_lun(&tv_cmd->tvc_se_cmd, tv_cmd->tvc_lun);
if (rc < 0) {
pr_err("Failed to look up lun: %d\n", tv_cmd->tvc_lun);
transport_send_check_condition_and_sense(&tv_cmd->tvc_se_cmd,
tv_cmd->tvc_se_cmd.scsi_sense_reason, 0);
transport_generic_free_cmd(se_cmd, 0);
return;
}
rc = target_setup_cmd_from_cdb(se_cmd, tv_cmd->tvc_cdb);
if (rc == -ENOMEM) {
transport_send_check_condition_and_sense(se_cmd,
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
transport_generic_free_cmd(se_cmd, 0);
return;
} else if (rc < 0) {
if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
tcm_vhost_queue_status(se_cmd);
else
transport_send_check_condition_and_sense(se_cmd,
se_cmd->scsi_sense_reason, 0);
transport_generic_free_cmd(se_cmd, 0);
return;
}
if (tv_cmd->tvc_sgl_count) {
sg_ptr = tv_cmd->tvc_sgl;
/*
* For BIDI commands, pass in the extra READ buffer
* to transport_generic_map_mem_to_cmd() below..
*/
/* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */
#if 0
if (se_cmd->se_cmd_flags & SCF_BIDI) {
sg_bidi_ptr = NULL;
sg_no_bidi = 0;
}
#endif
} else {
sg_ptr = NULL;
}
rc = transport_generic_map_mem_to_cmd(se_cmd, sg_ptr,
tv_cmd->tvc_sgl_count, sg_bidi_ptr,
sg_no_bidi);
if (rc < 0) {
transport_send_check_condition_and_sense(se_cmd,
se_cmd->scsi_sense_reason, 0);
transport_generic_free_cmd(se_cmd, 0);
return;
}
transport_handle_cdb_direct(se_cmd);
}
static void vhost_scsi_handle_vq(struct vhost_scsi *vs)
{
struct vhost_virtqueue *vq = &vs->vqs[2];
struct virtio_scsi_cmd_req v_req;
struct tcm_vhost_tpg *tv_tpg;
struct tcm_vhost_cmd *tv_cmd;
u32 exp_data_len, data_first, data_num, data_direction;
unsigned out, in, i;
int head, ret;
/* Must use ioctl VHOST_SCSI_SET_ENDPOINT */
tv_tpg = vs->vs_tpg;
if (unlikely(!tv_tpg)) {
pr_err("%s endpoint not set\n", __func__);
return;
}
mutex_lock(&vq->mutex);
vhost_disable_notify(&vs->dev, vq);
for (;;) {
head = vhost_get_vq_desc(&vs->dev, vq, vq->iov,
ARRAY_SIZE(vq->iov), &out, &in,
NULL, NULL);
pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
head, out, in);
/* On error, stop handling until the next kick. */
if (unlikely(head < 0))
break;
/* Nothing new? Wait for eventfd to tell us they refilled. */
if (head == vq->num) {
if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
vhost_disable_notify(&vs->dev, vq);
continue;
}
break;
}
/* FIXME: BIDI operation */
if (out == 1 && in == 1) {
data_direction = DMA_NONE;
data_first = 0;
data_num = 0;
} else if (out == 1 && in > 1) {
data_direction = DMA_FROM_DEVICE;
data_first = out + 1;
data_num = in - 1;
} else if (out > 1 && in == 1) {
data_direction = DMA_TO_DEVICE;
data_first = 1;
data_num = out - 1;
} else {
vq_err(vq, "Invalid buffer layout out: %u in: %u\n",
out, in);
break;
}
/*
* Check for a sane resp buffer so we can report errors to
* the guest.
*/
if (unlikely(vq->iov[out].iov_len !=
sizeof(struct virtio_scsi_cmd_resp))) {
vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
" bytes\n", vq->iov[out].iov_len);
break;
}
if (unlikely(vq->iov[0].iov_len != sizeof(v_req))) {
vq_err(vq, "Expecting virtio_scsi_cmd_req, got %zu"
" bytes\n", vq->iov[0].iov_len);
break;
}
pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p,"
" len: %zu\n", vq->iov[0].iov_base, sizeof(v_req));
ret = __copy_from_user(&v_req, vq->iov[0].iov_base,
sizeof(v_req));
if (unlikely(ret)) {
vq_err(vq, "Faulted on virtio_scsi_cmd_req\n");
break;
}
exp_data_len = 0;
for (i = 0; i < data_num; i++)
exp_data_len += vq->iov[data_first + i].iov_len;
tv_cmd = vhost_scsi_allocate_cmd(tv_tpg, &v_req,
exp_data_len, data_direction);
if (IS_ERR(tv_cmd)) {
vq_err(vq, "vhost_scsi_allocate_cmd failed %ld\n",
PTR_ERR(tv_cmd));
break;
}
pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
": %d\n", tv_cmd, exp_data_len, data_direction);
tv_cmd->tvc_vhost = vs;
if (unlikely(vq->iov[out].iov_len !=
sizeof(struct virtio_scsi_cmd_resp))) {
vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
" bytes, out: %d, in: %d\n",
vq->iov[out].iov_len, out, in);
break;
}
tv_cmd->tvc_resp = vq->iov[out].iov_base;
/*
* Copy in the recieved CDB descriptor into tv_cmd->tvc_cdb
* that will be used by tcm_vhost_new_cmd_map() and down into
* target_setup_cmd_from_cdb()
*/
memcpy(tv_cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE);
/*
* Check that the recieved CDB size does not exceeded our
* hardcoded max for tcm_vhost
*/
/* TODO what if cdb was too small for varlen cdb header? */
if (unlikely(scsi_command_size(tv_cmd->tvc_cdb) >
TCM_VHOST_MAX_CDB_SIZE)) {
vq_err(vq, "Received SCSI CDB with command_size: %d that"
" exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
scsi_command_size(tv_cmd->tvc_cdb),
TCM_VHOST_MAX_CDB_SIZE);
break; /* TODO */
}
tv_cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
tv_cmd->tvc_cdb[0], tv_cmd->tvc_lun);
if (data_direction != DMA_NONE) {
ret = vhost_scsi_map_iov_to_sgl(tv_cmd,
&vq->iov[data_first], data_num,
data_direction == DMA_TO_DEVICE);
if (unlikely(ret)) {
vq_err(vq, "Failed to map iov to sgl\n");
break; /* TODO */
}
}
/*
* Save the descriptor from vhost_get_vq_desc() to be used to
* complete the virtio-scsi request in TCM callback context via
* tcm_vhost_queue_data_in() and tcm_vhost_queue_status()
*/
tv_cmd->tvc_vq_desc = head;
/*
* Dispatch tv_cmd descriptor for cmwq execution in process
* context provided by tcm_vhost_workqueue. This also ensures
* tv_cmd is executed on the same kworker CPU as this vhost
* thread to gain positive L2 cache locality effects..
*/
INIT_WORK(&tv_cmd->work, tcm_vhost_submission_work);
queue_work(tcm_vhost_workqueue, &tv_cmd->work);
}
mutex_unlock(&vq->mutex);
}
static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
{
pr_err("%s: The handling func for control queue.\n", __func__);
}
static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
{
pr_err("%s: The handling func for event queue.\n", __func__);
}
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);
}
/*
* Called from vhost_scsi_ioctl() context to walk the list of available
* tcm_vhost_tpg with an active struct tcm_vhost_nexus
*/
static int vhost_scsi_set_endpoint(
struct vhost_scsi *vs,
struct vhost_scsi_target *t)
{
struct tcm_vhost_tport *tv_tport;
struct tcm_vhost_tpg *tv_tpg;
int index;
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])) {
mutex_unlock(&vs->dev.mutex);
return -EFAULT;
}
}
if (vs->vs_tpg) {
mutex_unlock(&vs->dev.mutex);
return -EEXIST;
}
mutex_unlock(&vs->dev.mutex);
mutex_lock(&tcm_vhost_mutex);
list_for_each_entry(tv_tpg, &tcm_vhost_list, tv_tpg_list) {
mutex_lock(&tv_tpg->tv_tpg_mutex);
if (!tv_tpg->tpg_nexus) {
mutex_unlock(&tv_tpg->tv_tpg_mutex);
continue;
}
if (atomic_read(&tv_tpg->tv_tpg_vhost_count)) {
mutex_unlock(&tv_tpg->tv_tpg_mutex);
continue;
}
tv_tport = tv_tpg->tport;
if (!strcmp(tv_tport->tport_name, t->vhost_wwpn) &&
(tv_tpg->tport_tpgt == t->vhost_tpgt)) {
atomic_inc(&tv_tpg->tv_tpg_vhost_count);
smp_mb__after_atomic_inc();
mutex_unlock(&tv_tpg->tv_tpg_mutex);
mutex_unlock(&tcm_vhost_mutex);
mutex_lock(&vs->dev.mutex);
vs->vs_tpg = tv_tpg;
atomic_inc(&vs->vhost_ref_cnt);
smp_mb__after_atomic_inc();
mutex_unlock(&vs->dev.mutex);
return 0;
}
mutex_unlock(&tv_tpg->tv_tpg_mutex);
}
mutex_unlock(&tcm_vhost_mutex);
return -EINVAL;
}
static int vhost_scsi_clear_endpoint(
struct vhost_scsi *vs,
struct vhost_scsi_target *t)
{
struct tcm_vhost_tport *tv_tport;
struct tcm_vhost_tpg *tv_tpg;
int index;
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])) {
mutex_unlock(&vs->dev.mutex);
return -EFAULT;
}
}
if (!vs->vs_tpg) {
mutex_unlock(&vs->dev.mutex);
return -ENODEV;
}
tv_tpg = vs->vs_tpg;
tv_tport = tv_tpg->tport;
if (strcmp(tv_tport->tport_name, t->vhost_wwpn) ||
(tv_tpg->tport_tpgt != t->vhost_tpgt)) {
mutex_unlock(&vs->dev.mutex);
pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu"
" does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
tv_tport->tport_name, tv_tpg->tport_tpgt,
t->vhost_wwpn, t->vhost_tpgt);
return -EINVAL;
}
atomic_dec(&tv_tpg->tv_tpg_vhost_count);
vs->vs_tpg = NULL;
mutex_unlock(&vs->dev.mutex);
return 0;
}
static int vhost_scsi_open(struct inode *inode, struct file *f)
{
struct vhost_scsi *s;
int r;
s = kzalloc(sizeof(*s), GFP_KERNEL);
if (!s)
return -ENOMEM;
vhost_work_init(&s->vs_completion_work, vhost_scsi_complete_cmd_work);
INIT_LIST_HEAD(&s->vs_completion_list);
spin_lock_init(&s->vs_completion_lock);
s->vqs[0].handle_kick = vhost_scsi_ctl_handle_kick;
s->vqs[1].handle_kick = vhost_scsi_evt_handle_kick;
s->vqs[2].handle_kick = vhost_scsi_handle_kick;
r = vhost_dev_init(&s->dev, s->vqs, 3);
if (r < 0) {
kfree(s);
return r;
}
f->private_data = s;
return 0;
}
static int vhost_scsi_release(struct inode *inode, struct file *f)
{
struct vhost_scsi *s = f->private_data;
if (s->vs_tpg && s->vs_tpg->tport) {
struct vhost_scsi_target backend;
memcpy(backend.vhost_wwpn, s->vs_tpg->tport->tport_name,
sizeof(backend.vhost_wwpn));
backend.vhost_tpgt = s->vs_tpg->tport_tpgt;
vhost_scsi_clear_endpoint(s, &backend);
}
vhost_dev_cleanup(&s->dev, false);
kfree(s);
return 0;
}
static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
{
if (features & ~VHOST_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;
}
vs->dev.acked_features = features;
/* TODO possibly smp_wmb() and flush vqs */
mutex_unlock(&vs->dev.mutex);
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;
u64 features;
int r;
switch (ioctl) {
case VHOST_SCSI_SET_ENDPOINT:
if (copy_from_user(&backend, argp, sizeof backend))
return -EFAULT;
return vhost_scsi_set_endpoint(vs, &backend);
case VHOST_SCSI_CLEAR_ENDPOINT:
if (copy_from_user(&backend, argp, sizeof backend))
return -EFAULT;
return vhost_scsi_clear_endpoint(vs, &backend);
case VHOST_SCSI_GET_ABI_VERSION:
if (copy_from_user(&backend, argp, sizeof backend))
return -EFAULT;
backend.abi_version = VHOST_SCSI_ABI_VERSION;
if (copy_to_user(argp, &backend, sizeof backend))
return -EFAULT;
return 0;
case VHOST_GET_FEATURES:
features = VHOST_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, arg);
mutex_unlock(&vs->dev.mutex);
return r;
}
}
static const struct file_operations vhost_scsi_fops = {
.owner = THIS_MODULE,
.release = vhost_scsi_release,
.unlocked_ioctl = vhost_scsi_ioctl,
/* TODO compat ioctl? */
.open = vhost_scsi_open,
.llseek = noop_llseek,
};
static struct miscdevice vhost_scsi_misc = {
MISC_DYNAMIC_MINOR,
"vhost-scsi",
&vhost_scsi_fops,
};
static int __init vhost_scsi_register(void)
{
return misc_register(&vhost_scsi_misc);
}
static int vhost_scsi_deregister(void)
{
return misc_deregister(&vhost_scsi_misc);
}
static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport)
{
switch (tport->tport_proto_id) {
case SCSI_PROTOCOL_SAS:
return "SAS";
case SCSI_PROTOCOL_FCP:
return "FCP";
case SCSI_PROTOCOL_ISCSI:
return "iSCSI";
default:
break;
}
return "Unknown";
}
static int tcm_vhost_port_link(
struct se_portal_group *se_tpg,
struct se_lun *lun)
{
struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
atomic_inc(&tv_tpg->tv_tpg_port_count);
smp_mb__after_atomic_inc();
return 0;
}
static void tcm_vhost_port_unlink(
struct se_portal_group *se_tpg,
struct se_lun *se_lun)
{
struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
atomic_dec(&tv_tpg->tv_tpg_port_count);
smp_mb__after_atomic_dec();
}
static struct se_node_acl *tcm_vhost_make_nodeacl(
struct se_portal_group *se_tpg,
struct config_group *group,
const char *name)
{
struct se_node_acl *se_nacl, *se_nacl_new;
struct tcm_vhost_nacl *nacl;
u64 wwpn = 0;
u32 nexus_depth;
/* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
return ERR_PTR(-EINVAL); */
se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg);
if (!se_nacl_new)
return ERR_PTR(-ENOMEM);
nexus_depth = 1;
/*
* se_nacl_new may be released by core_tpg_add_initiator_node_acl()
* when converting a NodeACL from demo mode -> explict
*/
se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
name, nexus_depth);
if (IS_ERR(se_nacl)) {
tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new);
return se_nacl;
}
/*
* Locate our struct tcm_vhost_nacl and set the FC Nport WWPN
*/
nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl);
nacl->iport_wwpn = wwpn;
return se_nacl;
}
static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl)
{
struct tcm_vhost_nacl *nacl = container_of(se_acl,
struct tcm_vhost_nacl, se_node_acl);
core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
kfree(nacl);
}
static int tcm_vhost_make_nexus(
struct tcm_vhost_tpg *tv_tpg,
const char *name)
{
struct se_portal_group *se_tpg;
struct tcm_vhost_nexus *tv_nexus;
mutex_lock(&tv_tpg->tv_tpg_mutex);
if (tv_tpg->tpg_nexus) {
mutex_unlock(&tv_tpg->tv_tpg_mutex);
pr_debug("tv_tpg->tpg_nexus already exists\n");
return -EEXIST;
}
se_tpg = &tv_tpg->se_tpg;
tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL);
if (!tv_nexus) {
mutex_unlock(&tv_tpg->tv_tpg_mutex);
pr_err("Unable to allocate struct tcm_vhost_nexus\n");
return -ENOMEM;
}
/*
* Initialize the struct se_session pointer
*/
tv_nexus->tvn_se_sess = transport_init_session();
if (IS_ERR(tv_nexus->tvn_se_sess)) {
mutex_unlock(&tv_tpg->tv_tpg_mutex);
kfree(tv_nexus);
return -ENOMEM;
}
/*
* Since we are running in 'demo mode' this call with generate a
* struct se_node_acl for the tcm_vhost struct se_portal_group with
* the SCSI Initiator port name of the passed configfs group 'name'.
*/
tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
se_tpg, (unsigned char *)name);
if (!tv_nexus->tvn_se_sess->se_node_acl) {
mutex_unlock(&tv_tpg->tv_tpg_mutex);
pr_debug("core_tpg_check_initiator_node_acl() failed"
" for %s\n", name);
transport_free_session(tv_nexus->tvn_se_sess);
kfree(tv_nexus);
return -ENOMEM;
}
/*
* Now register the TCM vHost virtual I_T Nexus as active with the
* call to __transport_register_session()
*/
__transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
tv_nexus->tvn_se_sess, tv_nexus);
tv_tpg->tpg_nexus = tv_nexus;
mutex_unlock(&tv_tpg->tv_tpg_mutex);
return 0;
}
static int tcm_vhost_drop_nexus(
struct tcm_vhost_tpg *tpg)
{
struct se_session *se_sess;
struct tcm_vhost_nexus *tv_nexus;
mutex_lock(&tpg->tv_tpg_mutex);
tv_nexus = tpg->tpg_nexus;
if (!tv_nexus) {
mutex_unlock(&tpg->tv_tpg_mutex);
return -ENODEV;
}
se_sess = tv_nexus->tvn_se_sess;
if (!se_sess) {
mutex_unlock(&tpg->tv_tpg_mutex);
return -ENODEV;
}
if (atomic_read(&tpg->tv_tpg_port_count)) {
mutex_unlock(&tpg->tv_tpg_mutex);
pr_err("Unable to remove TCM_vHost I_T Nexus with"
" active TPG port count: %d\n",
atomic_read(&tpg->tv_tpg_port_count));
return -EPERM;
}
if (atomic_read(&tpg->tv_tpg_vhost_count)) {
mutex_unlock(&tpg->tv_tpg_mutex);
pr_err("Unable to remove TCM_vHost I_T Nexus with"
" active TPG vhost count: %d\n",
atomic_read(&tpg->tv_tpg_vhost_count));
return -EPERM;
}
pr_debug("TCM_vHost_ConfigFS: Removing I_T Nexus to emulated"
" %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport),
tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
/*
* Release the SCSI I_T Nexus to the emulated vHost Target Port
*/
transport_deregister_session(tv_nexus->tvn_se_sess);
tpg->tpg_nexus = NULL;
mutex_unlock(&tpg->tv_tpg_mutex);
kfree(tv_nexus);
return 0;
}
static ssize_t tcm_vhost_tpg_show_nexus(
struct se_portal_group *se_tpg,
char *page)
{
struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
struct tcm_vhost_nexus *tv_nexus;
ssize_t ret;
mutex_lock(&tv_tpg->tv_tpg_mutex);
tv_nexus = tv_tpg->tpg_nexus;
if (!tv_nexus) {
mutex_unlock(&tv_tpg->tv_tpg_mutex);
return -ENODEV;
}
ret = snprintf(page, PAGE_SIZE, "%s\n",
tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
mutex_unlock(&tv_tpg->tv_tpg_mutex);
return ret;
}
static ssize_t tcm_vhost_tpg_store_nexus(
struct se_portal_group *se_tpg,
const char *page,
size_t count)
{
struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
struct tcm_vhost_tport *tport_wwn = tv_tpg->tport;
unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr;
int ret;
/*
* Shutdown the active I_T nexus if 'NULL' is passed..
*/
if (!strncmp(page, "NULL", 4)) {
ret = tcm_vhost_drop_nexus(tv_tpg);
return (!ret) ? count : ret;
}
/*
* Otherwise make sure the passed virtual Initiator port WWN matches
* the fabric protocol_id set in tcm_vhost_make_tport(), and call
* tcm_vhost_make_nexus().
*/
if (strlen(page) >= TCM_VHOST_NAMELEN) {
pr_err("Emulated NAA Sas Address: %s, exceeds"
" max: %d\n", page, TCM_VHOST_NAMELEN);
return -EINVAL;
}
snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page);
ptr = strstr(i_port, "naa.");
if (ptr) {
if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
pr_err("Passed SAS Initiator Port %s does not"
" match target port protoid: %s\n", i_port,
tcm_vhost_dump_proto_id(tport_wwn));
return -EINVAL;
}
port_ptr = &i_port[0];
goto check_newline;
}
ptr = strstr(i_port, "fc.");
if (ptr) {
if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
pr_err("Passed FCP Initiator Port %s does not"
" match target port protoid: %s\n", i_port,
tcm_vhost_dump_proto_id(tport_wwn));
return -EINVAL;
}
port_ptr = &i_port[3]; /* Skip over "fc." */
goto check_newline;
}
ptr = strstr(i_port, "iqn.");
if (ptr) {
if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
pr_err("Passed iSCSI Initiator Port %s does not"
" match target port protoid: %s\n", i_port,
tcm_vhost_dump_proto_id(tport_wwn));
return -EINVAL;
}
port_ptr = &i_port[0];
goto check_newline;
}
pr_err("Unable to locate prefix for emulated Initiator Port:"
" %s\n", i_port);
return -EINVAL;
/*
* Clear any trailing newline for the NAA WWN
*/
check_newline:
if (i_port[strlen(i_port)-1] == '\n')
i_port[strlen(i_port)-1] = '\0';
ret = tcm_vhost_make_nexus(tv_tpg, port_ptr);
if (ret < 0)
return ret;
return count;
}
TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR);
static struct configfs_attribute *tcm_vhost_tpg_attrs[] = {
&tcm_vhost_tpg_nexus.attr,
NULL,
};
static struct se_portal_group *tcm_vhost_make_tpg(
struct se_wwn *wwn,
struct config_group *group,
const char *name)
{
struct tcm_vhost_tport *tport = container_of(wwn,
struct tcm_vhost_tport, tport_wwn);
struct tcm_vhost_tpg *tpg;
unsigned long tpgt;
int ret;
if (strstr(name, "tpgt_") != name)
return ERR_PTR(-EINVAL);
if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
return ERR_PTR(-EINVAL);
tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL);
if (!tpg) {
pr_err("Unable to allocate struct tcm_vhost_tpg");
return ERR_PTR(-ENOMEM);
}
mutex_init(&tpg->tv_tpg_mutex);
INIT_LIST_HEAD(&tpg->tv_tpg_list);
tpg->tport = tport;
tpg->tport_tpgt = tpgt;
ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn,
&tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
if (ret < 0) {
kfree(tpg);
return NULL;
}
mutex_lock(&tcm_vhost_mutex);
list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list);
mutex_unlock(&tcm_vhost_mutex);
return &tpg->se_tpg;
}
static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg)
{
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
mutex_lock(&tcm_vhost_mutex);
list_del(&tpg->tv_tpg_list);
mutex_unlock(&tcm_vhost_mutex);
/*
* Release the virtual I_T Nexus for this vHost TPG
*/
tcm_vhost_drop_nexus(tpg);
/*
* Deregister the se_tpg from TCM..
*/
core_tpg_deregister(se_tpg);
kfree(tpg);
}
static struct se_wwn *tcm_vhost_make_tport(
struct target_fabric_configfs *tf,
struct config_group *group,
const char *name)
{
struct tcm_vhost_tport *tport;
char *ptr;
u64 wwpn = 0;
int off = 0;
/* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
return ERR_PTR(-EINVAL); */
tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL);
if (!tport) {
pr_err("Unable to allocate struct tcm_vhost_tport");
return ERR_PTR(-ENOMEM);
}
tport->tport_wwpn = wwpn;
/*
* Determine the emulated Protocol Identifier and Target Port Name
* based on the incoming configfs directory name.
*/
ptr = strstr(name, "naa.");
if (ptr) {
tport->tport_proto_id = SCSI_PROTOCOL_SAS;
goto check_len;
}
ptr = strstr(name, "fc.");
if (ptr) {
tport->tport_proto_id = SCSI_PROTOCOL_FCP;
off = 3; /* Skip over "fc." */
goto check_len;
}
ptr = strstr(name, "iqn.");
if (ptr) {
tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
goto check_len;
}
pr_err("Unable to locate prefix for emulated Target Port:"
" %s\n", name);
kfree(tport);
return ERR_PTR(-EINVAL);
check_len:
if (strlen(name) >= TCM_VHOST_NAMELEN) {
pr_err("Emulated %s Address: %s, exceeds"
" max: %d\n", name, tcm_vhost_dump_proto_id(tport),
TCM_VHOST_NAMELEN);
kfree(tport);
return ERR_PTR(-EINVAL);
}
snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]);
pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
" %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name);
return &tport->tport_wwn;
}
static void tcm_vhost_drop_tport(struct se_wwn *wwn)
{
struct tcm_vhost_tport *tport = container_of(wwn,
struct tcm_vhost_tport, tport_wwn);
pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
" %s Address: %s\n", tcm_vhost_dump_proto_id(tport),
tport->tport_name);
kfree(tport);
}
static ssize_t tcm_vhost_wwn_show_attr_version(
struct target_fabric_configfs *tf,
char *page)
{
return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
"on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
utsname()->machine);
}
TF_WWN_ATTR_RO(tcm_vhost, version);
static struct configfs_attribute *tcm_vhost_wwn_attrs[] = {
&tcm_vhost_wwn_version.attr,
NULL,
};
static struct target_core_fabric_ops tcm_vhost_ops = {
.get_fabric_name = tcm_vhost_get_fabric_name,
.get_fabric_proto_ident = tcm_vhost_get_fabric_proto_ident,
.tpg_get_wwn = tcm_vhost_get_fabric_wwn,
.tpg_get_tag = tcm_vhost_get_tag,
.tpg_get_default_depth = tcm_vhost_get_default_depth,
.tpg_get_pr_transport_id = tcm_vhost_get_pr_transport_id,
.tpg_get_pr_transport_id_len = tcm_vhost_get_pr_transport_id_len,
.tpg_parse_pr_out_transport_id = tcm_vhost_parse_pr_out_transport_id,
.tpg_check_demo_mode = tcm_vhost_check_true,
.tpg_check_demo_mode_cache = tcm_vhost_check_true,
.tpg_check_demo_mode_write_protect = tcm_vhost_check_false,
.tpg_check_prod_mode_write_protect = tcm_vhost_check_false,
.tpg_alloc_fabric_acl = tcm_vhost_alloc_fabric_acl,
.tpg_release_fabric_acl = tcm_vhost_release_fabric_acl,
.tpg_get_inst_index = tcm_vhost_tpg_get_inst_index,
.release_cmd = tcm_vhost_release_cmd,
.shutdown_session = tcm_vhost_shutdown_session,
.close_session = tcm_vhost_close_session,
.sess_get_index = tcm_vhost_sess_get_index,
.sess_get_initiator_sid = NULL,
.write_pending = tcm_vhost_write_pending,
.write_pending_status = tcm_vhost_write_pending_status,
.set_default_node_attributes = tcm_vhost_set_default_node_attrs,
.get_task_tag = tcm_vhost_get_task_tag,
.get_cmd_state = tcm_vhost_get_cmd_state,
.queue_data_in = tcm_vhost_queue_data_in,
.queue_status = tcm_vhost_queue_status,
.queue_tm_rsp = tcm_vhost_queue_tm_rsp,
.get_fabric_sense_len = tcm_vhost_get_fabric_sense_len,
.set_fabric_sense_len = tcm_vhost_set_fabric_sense_len,
/*
* Setup callers for generic logic in target_core_fabric_configfs.c
*/
.fabric_make_wwn = tcm_vhost_make_tport,
.fabric_drop_wwn = tcm_vhost_drop_tport,
.fabric_make_tpg = tcm_vhost_make_tpg,
.fabric_drop_tpg = tcm_vhost_drop_tpg,
.fabric_post_link = tcm_vhost_port_link,
.fabric_pre_unlink = tcm_vhost_port_unlink,
.fabric_make_np = NULL,
.fabric_drop_np = NULL,
.fabric_make_nodeacl = tcm_vhost_make_nodeacl,
.fabric_drop_nodeacl = tcm_vhost_drop_nodeacl,
};
static int tcm_vhost_register_configfs(void)
{
struct target_fabric_configfs *fabric;
int ret;
pr_debug("TCM_VHOST fabric module %s on %s/%s"
" on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
utsname()->machine);
/*
* Register the top level struct config_item_type with TCM core
*/
fabric = target_fabric_configfs_init(THIS_MODULE, "vhost");
if (IS_ERR(fabric)) {
pr_err("target_fabric_configfs_init() failed\n");
return PTR_ERR(fabric);
}
/*
* Setup fabric->tf_ops from our local tcm_vhost_ops
*/
fabric->tf_ops = tcm_vhost_ops;
/*
* Setup default attribute lists for various fabric->tf_cit_tmpl
*/
TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs;
TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs;
TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
/*
* Register the fabric for use within TCM
*/
ret = target_fabric_configfs_register(fabric);
if (ret < 0) {
pr_err("target_fabric_configfs_register() failed"
" for TCM_VHOST\n");
return ret;
}
/*
* Setup our local pointer to *fabric
*/
tcm_vhost_fabric_configfs = fabric;
pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n");
return 0;
};
static void tcm_vhost_deregister_configfs(void)
{
if (!tcm_vhost_fabric_configfs)
return;
target_fabric_configfs_deregister(tcm_vhost_fabric_configfs);
tcm_vhost_fabric_configfs = NULL;
pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n");
};
static int __init tcm_vhost_init(void)
{
int ret = -ENOMEM;
tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0);
if (!tcm_vhost_workqueue)
goto out;
ret = vhost_scsi_register();
if (ret < 0)
goto out_destroy_workqueue;
ret = tcm_vhost_register_configfs();
if (ret < 0)
goto out_vhost_scsi_deregister;
return 0;
out_vhost_scsi_deregister:
vhost_scsi_deregister();
out_destroy_workqueue:
destroy_workqueue(tcm_vhost_workqueue);
out:
return ret;
};
static void tcm_vhost_exit(void)
{
tcm_vhost_deregister_configfs();
vhost_scsi_deregister();
destroy_workqueue(tcm_vhost_workqueue);
};
MODULE_DESCRIPTION("TCM_VHOST series fabric driver");
MODULE_LICENSE("GPL");
module_init(tcm_vhost_init);
module_exit(tcm_vhost_exit);
#define TCM_VHOST_VERSION "v0.1"
#define TCM_VHOST_NAMELEN 256
#define TCM_VHOST_MAX_CDB_SIZE 32
struct tcm_vhost_cmd {
/* Descriptor from vhost_get_vq_desc() for virt_queue segment */
int tvc_vq_desc;
/* 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;
/* Saved unpacked SCSI LUN for tcm_vhost_submission_work() */
u32 tvc_lun;
/* Pointer to the SGL formatted memory from virtio-scsi */
struct scatterlist *tvc_sgl;
/* Pointer to response */
struct virtio_scsi_cmd_resp __user *tvc_resp;
/* Pointer to vhost_scsi for our device */
struct vhost_scsi *tvc_vhost;
/* The TCM I/O descriptor that is accessed via container_of() */
struct se_cmd tvc_se_cmd;
/* work item used for cmwq dispatch to tcm_vhost_submission_work() */
struct work_struct work;
/* Copy of the incoming SCSI command descriptor block (CDB) */
unsigned char tvc_cdb[TCM_VHOST_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 list_head tvc_completion_list;
};
struct tcm_vhost_nexus {
/* Pointer to TCM session for I_T Nexus */
struct se_session *tvn_se_sess;
};
struct tcm_vhost_nacl {
/* Binary World Wide unique Port Name for Vhost Initiator port */
u64 iport_wwpn;
/* ASCII formatted WWPN for Sas Initiator port */
char iport_name[TCM_VHOST_NAMELEN];
/* Returned by tcm_vhost_make_nodeacl() */
struct se_node_acl se_node_acl;
};
struct tcm_vhost_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 */
atomic_t tv_tpg_port_count;
/* Used for vhost_scsi device reference to tpg_nexus */
atomic_t tv_tpg_vhost_count;
/* list for tcm_vhost_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 tcm_vhost_nexus *tpg_nexus;
/* Pointer back to tcm_vhost_tport */
struct tcm_vhost_tport *tport;
/* Returned by tcm_vhost_make_tpg() */
struct se_portal_group se_tpg;
};
struct tcm_vhost_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[TCM_VHOST_NAMELEN];
/* Returned by tcm_vhost_make_tport() */
struct se_wwn tport_wwn;
};
/*
* As per request from MST, keep TCM_VHOST related ioctl defines out of
* linux/vhost.h (user-space) for now..
*/
#include <linux/vhost.h>
/*
* Used by QEMU userspace to ensure a consistent vhost-scsi ABI.
*
* ABI Rev 0: July 2012 version starting point for v3.6-rc merge candidate +
* RFC-v2 vhost-scsi userspace. Add GET_ABI_VERSION ioctl usage
*/
#define VHOST_SCSI_ABI_VERSION 0
struct vhost_scsi_target {
int abi_version;
unsigned char vhost_wwpn[TRANSPORT_IQN_LEN];
unsigned short vhost_tpgt;
};
/* VHOST_SCSI specific defines */
#define VHOST_SCSI_SET_ENDPOINT _IOW(VHOST_VIRTIO, 0x40, struct vhost_scsi_target)
#define VHOST_SCSI_CLEAR_ENDPOINT _IOW(VHOST_VIRTIO, 0x41, struct vhost_scsi_target)
#define VHOST_SCSI_GET_ABI_VERSION _IOW(VHOST_VIRTIO, 0x42, struct vhost_scsi_target)
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