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iscsi/iser-target: Add fabric_prot_type attribute support

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

This is required for ib_isert to enable WRITE_STRIP + READ_INSERT
hardware offloads.

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

Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Martin Petersen <martin.petersen@oracle.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2015-03-29 19:36:16 -07:00
parent 64b1688774
commit 901c04a33f
4 changed files with 44 additions and 0 deletions
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22
drivers/target/iscsi/iscsi_target_configfs.c
View File

@ -1052,6 +1052,11 @@ TPG_ATTR(default_erl, S_IRUGO | S_IWUSR);
*/
DEF_TPG_ATTRIB(t10_pi);
TPG_ATTR(t10_pi, S_IRUGO | S_IWUSR);
/*
* Define iscsi_tpg_attrib_s_fabric_prot_type
*/
DEF_TPG_ATTRIB(fabric_prot_type);
TPG_ATTR(fabric_prot_type, S_IRUGO | S_IWUSR);
static struct configfs_attribute *lio_target_tpg_attrib_attrs[] = {
&iscsi_tpg_attrib_authentication.attr,
@ -1065,6 +1070,7 @@ static struct configfs_attribute *lio_target_tpg_attrib_attrs[] = {
&iscsi_tpg_attrib_demo_mode_discovery.attr,
&iscsi_tpg_attrib_default_erl.attr,
&iscsi_tpg_attrib_t10_pi.attr,
&iscsi_tpg_attrib_fabric_prot_type.attr,
NULL,
};
@ -1882,6 +1888,20 @@ static int lio_tpg_check_prod_mode_write_protect(
return tpg->tpg_attrib.prod_mode_write_protect;
}
static int lio_tpg_check_prot_fabric_only(
struct se_portal_group *se_tpg)
{
struct iscsi_portal_group *tpg = se_tpg->se_tpg_fabric_ptr;
/*
* Only report fabric_prot_type if t10_pi has also been enabled
* for incoming ib_isert sessions.
*/
if (!tpg->tpg_attrib.t10_pi)
return 0;
return tpg->tpg_attrib.fabric_prot_type;
}
static void lio_tpg_release_fabric_acl(
struct se_portal_group *se_tpg,
struct se_node_acl *se_acl)
@ -1997,6 +2017,8 @@ int iscsi_target_register_configfs(void)
&lio_tpg_check_demo_mode_write_protect;
fabric->tf_ops.tpg_check_prod_mode_write_protect =
&lio_tpg_check_prod_mode_write_protect;
fabric->tf_ops.tpg_check_prot_fabric_only =
&lio_tpg_check_prot_fabric_only;
fabric->tf_ops.tpg_alloc_fabric_acl = &lio_tpg_alloc_fabric_acl;
fabric->tf_ops.tpg_release_fabric_acl = &lio_tpg_release_fabric_acl;
fabric->tf_ops.tpg_get_inst_index = &lio_tpg_get_inst_index;

19
drivers/target/iscsi/iscsi_target_tpg.c
View File

@ -228,6 +228,7 @@ static void iscsit_set_default_tpg_attribs(struct iscsi_portal_group *tpg)
a->demo_mode_discovery = TA_DEMO_MODE_DISCOVERY;
a->default_erl = TA_DEFAULT_ERL;
a->t10_pi = TA_DEFAULT_T10_PI;
a->fabric_prot_type = TA_DEFAULT_FABRIC_PROT_TYPE;
}
int iscsit_tpg_add_portal_group(struct iscsi_tiqn *tiqn, struct iscsi_portal_group *tpg)
@ -878,3 +879,21 @@ int iscsit_ta_t10_pi(
return 0;
}
int iscsit_ta_fabric_prot_type(
struct iscsi_portal_group *tpg,
u32 prot_type)
{
struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
if ((prot_type != 0) && (prot_type != 1) && (prot_type != 3)) {
pr_err("Illegal value for fabric_prot_type: %u\n", prot_type);
return -EINVAL;
}
a->fabric_prot_type = prot_type;
pr_debug("iSCSI_TPG[%hu] - T10 Fabric Protection Type: %u\n",
tpg->tpgt, prot_type);
return 0;
}

1
drivers/target/iscsi/iscsi_target_tpg.h
View File

@ -39,5 +39,6 @@ extern int iscsit_ta_prod_mode_write_protect(struct iscsi_portal_group *, u32);
extern int iscsit_ta_demo_mode_discovery(struct iscsi_portal_group *, u32);
extern int iscsit_ta_default_erl(struct iscsi_portal_group *, u32);
extern int iscsit_ta_t10_pi(struct iscsi_portal_group *, u32);
extern int iscsit_ta_fabric_prot_type(struct iscsi_portal_group *, u32);
#endif /* ISCSI_TARGET_TPG_H */

2
include/target/iscsi/iscsi_target_core.h
View File

@ -62,6 +62,7 @@
#define TA_CACHE_CORE_NPS 0
/* T10 protection information disabled by default */
#define TA_DEFAULT_T10_PI 0
#define TA_DEFAULT_FABRIC_PROT_TYPE 0
#define ISCSI_IOV_DATA_BUFFER 5
@ -772,6 +773,7 @@ struct iscsi_tpg_attrib {
u32 demo_mode_discovery;
u32 default_erl;
u8 t10_pi;
u32 fabric_prot_type;
struct iscsi_portal_group *tpg;
};