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vhost/scsi: Add fabric_prot_type attribute support 

This patch updates vhost-scsi to add a new fabric_prot_type TPG
attribute, used for controlling LLD level protection into LIO when
the backend device does not support T10-PI.

This is required for vhost-scsi to enable WRITE_STRIP + READ_INSERT
operations using software emulation + crct10dif instruction offload.

It's disabled by default and controls which se_sesion->sess_prot_type
are set at vhost_scsi_make_nexus() session registration time.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Martin Petersen <martin.petersen@oracle.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2015-03-28 00:03:51 -07:00
parent 436f4a0a99
commit b1d75fe53e
1 changed files with 51 additions and 1 deletions
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52
drivers/vhost/scsi.c
View File

@ -131,6 +131,8 @@ struct vhost_scsi_tpg {
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 */
@ -431,6 +433,14 @@ vhost_scsi_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
port_nexus_ptr);
}
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 struct se_node_acl *
vhost_scsi_alloc_fabric_acl(struct se_portal_group *se_tpg)
{
@ -1878,6 +1888,45 @@ static void vhost_scsi_free_cmd_map_res(struct vhost_scsi_nexus *nexus,
}
}
static ssize_t vhost_scsi_tpg_attrib_store_fabric_prot_type(
struct se_portal_group *se_tpg,
const char *page,
size_t count)
{
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_show_fabric_prot_type(
struct se_portal_group *se_tpg,
char *page)
{
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);
}
TF_TPG_ATTRIB_ATTR(vhost_scsi, fabric_prot_type, S_IRUGO | S_IWUSR);
static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = {
&vhost_scsi_tpg_attrib_fabric_prot_type.attr,
NULL,
};
static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
const char *name)
{
@ -2290,6 +2339,7 @@ static struct target_core_fabric_ops vhost_scsi_ops = {
.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_alloc_fabric_acl = vhost_scsi_alloc_fabric_acl,
.tpg_release_fabric_acl = vhost_scsi_release_fabric_acl,
.tpg_get_inst_index = vhost_scsi_tpg_get_inst_index,
@ -2348,7 +2398,7 @@ static int vhost_scsi_register_configfs(void)
*/
fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = vhost_scsi_wwn_attrs;
fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = vhost_scsi_tpg_attrs;
fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = vhost_scsi_tpg_attrib_attrs;
fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL;
fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL;