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target: Add protected fabric + unprotected device support

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This patch adds a new target_core_fabric_ops callback for allowing fabric
drivers to expose a TPG attribute for signaling when a T10-PI protected
fabric wants to function with an un-protected device without T10-PI.

This specifically is to allow LIO to perform WRITE_STRIP + READ_INSERT
operations when functioning with non T10-PI enabled devices, seperate
from any available hw offloads the fabric supports.

This is done using a new se_sess->sess_prot_type that is set at fabric
session creation time based upon the TPG attribute.  It currently cannot
be changed for individual sessions after initial creation.

Also, update existing target_core_sbc.c code to honor sess_prot_type when
setting up cmd->prot_op + cmd->prot_type assignments.

(Add unlikely and !! boolean conversion in sbc_check_prot - Sagi)

Cc: Martin Petersen <martin.petersen@oracle.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Doug Gilbert <dgilbert@interlog.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2015-02-27 22:05:21 -08:00
parent 823ddd877f
commit 38b57f82f6
4 changed files with 50 additions and 11 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

40
drivers/target/target_core_sbc.c
View file

@ -581,11 +581,12 @@ sbc_compare_and_write(struct se_cmd *cmd)
}
static int
sbc_set_prot_op_checks(u8 protect, enum target_prot_type prot_type,
sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type,
bool is_write, struct se_cmd *cmd)
{
if (is_write) {
cmd->prot_op = protect ? TARGET_PROT_DOUT_PASS :
cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP :
protect ? TARGET_PROT_DOUT_PASS :
TARGET_PROT_DOUT_INSERT;
switch (protect) {
case 0x0:
@ -610,7 +611,8 @@ sbc_set_prot_op_checks(u8 protect, enum target_prot_type prot_type,
return -EINVAL;
}
} else {
cmd->prot_op = protect ? TARGET_PROT_DIN_PASS :
cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT :
protect ? TARGET_PROT_DIN_PASS :
TARGET_PROT_DIN_STRIP;
switch (protect) {
case 0x0:
@ -644,11 +646,15 @@ sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
u32 sectors, bool is_write)
{
u8 protect = cdb[1] >> 5;
int sp_ops = cmd->se_sess->sup_prot_ops;
int pi_prot_type = dev->dev_attrib.pi_prot_type;
bool fabric_prot = false;
if (!cmd->t_prot_sg || !cmd->t_prot_nents) {
if (protect && !dev->dev_attrib.pi_prot_type) {
pr_err("CDB contains protect bit, but device does not"
" advertise PROTECT=1 feature bit\n");
if (unlikely(protect &&
!dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) {
pr_err("CDB contains protect bit, but device + fabric does"
" not advertise PROTECT=1 feature bit\n");
return TCM_INVALID_CDB_FIELD;
}
if (cmd->prot_pto)
@ -669,15 +675,28 @@ sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
cmd->reftag_seed = cmd->t_task_lba;
break;
case TARGET_DIF_TYPE0_PROT:
/*
* See if the fabric supports T10-PI, and the session has been
* configured to allow export PROTECT=1 feature bit with backend
* devices that don't support T10-PI.
*/
fabric_prot = is_write ?
!!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) :
!!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT));
if (fabric_prot && cmd->se_sess->sess_prot_type) {
pi_prot_type = cmd->se_sess->sess_prot_type;
break;
}
/* Fallthrough */
default:
return TCM_NO_SENSE;
}
if (sbc_set_prot_op_checks(protect, dev->dev_attrib.pi_prot_type,
is_write, cmd))
if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd))
return TCM_INVALID_CDB_FIELD;
cmd->prot_type = dev->dev_attrib.pi_prot_type;
cmd->prot_type = pi_prot_type;
cmd->prot_length = dev->prot_length * sectors;
/**
@ -1231,6 +1250,9 @@ sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
unsigned int i, len, left;
unsigned int offset = sg_off;
if (!sg)
return;
left = sectors * dev->prot_length;
for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {

8
drivers/target/target_core_transport.c
View file

@ -322,10 +322,18 @@ void __transport_register_session(
struct se_session *se_sess,
void *fabric_sess_ptr)
{
struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
unsigned char buf[PR_REG_ISID_LEN];
se_sess->se_tpg = se_tpg;
se_sess->fabric_sess_ptr = fabric_sess_ptr;
/*
* Determine if fabric allows for T10-PI feature bits to be exposed
* to initiators for device backends with !dev->dev_attrib.pi_prot_type
*/
if (tfo->tpg_check_prot_fabric_only)
se_sess->sess_prot_type = tfo->tpg_check_prot_fabric_only(se_tpg);
/*
* Used by struct se_node_acl's under ConfigFS to locate active se_session-t
*

1
include/target/target_core_base.h
View file

@ -616,6 +616,7 @@ struct se_session {
unsigned sess_tearing_down:1;
u64 sess_bin_isid;
enum target_prot_op sup_prot_ops;
enum target_prot_type sess_prot_type;
struct se_node_acl *se_node_acl;
struct se_portal_group *se_tpg;
void *fabric_sess_ptr;

8
include/target/target_core_fabric.h
View file

@ -27,6 +27,14 @@ struct target_core_fabric_ops {
* inquiry response
*/
int (*tpg_check_demo_mode_login_only)(struct se_portal_group *);
/*
* Optionally used as a configfs tunable to determine when
* target-core should signal the PROTECT=1 feature bit for
* backends that don't support T10-PI, so that either fabric
* HW offload or target-core emulation performs the associated
* WRITE_STRIP and READ_INSERT operations.
*/
int (*tpg_check_prot_fabric_only)(struct se_portal_group *);
struct se_node_acl *(*tpg_alloc_fabric_acl)(
struct se_portal_group *);
void (*tpg_release_fabric_acl)(struct se_portal_group *,