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scsi: target: Pass in cmd counter to use during cmd setup 

Allow target_get_sess_cmd() users to pass in the cmd counter they want to
use. Right now we pass in the session's cmd counter but in a subsequent
commit iSCSI will switch from per session to per conn.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Link: https://lore.kernel.org/r/20230319015620.96006-4-michael.christie@oracle.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie 2023-03-18 20:56:14 -05:00 committed by Martin K. Petersen
parent 4edba7e4a8
commit 8e288be860
5 changed files with 30 additions and 28 deletions
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10
drivers/target/iscsi/iscsi_target.c
View File

@ -1190,9 +1190,10 @@ int iscsit_setup_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
* Initialize struct se_cmd descriptor from target_core_mod infrastructure
*/
__target_init_cmd(&cmd->se_cmd, &iscsi_ops,
conn->sess->se_sess, be32_to_cpu(hdr->data_length),
cmd->data_direction, sam_task_attr,
cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun));
conn->sess->se_sess, be32_to_cpu(hdr->data_length),
cmd->data_direction, sam_task_attr,
cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun),
conn->sess->se_sess->cmd_cnt);
pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
" ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
@ -2055,7 +2056,8 @@ iscsit_handle_task_mgt_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
__target_init_cmd(&cmd->se_cmd, &iscsi_ops,
conn->sess->se_sess, 0, DMA_NONE,
TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
scsilun_to_int(&hdr->lun));
scsilun_to_int(&hdr->lun),
conn->sess->se_sess->cmd_cnt);
target_get_sess_cmd(&cmd->se_cmd, true);

28
drivers/target/target_core_transport.c
View File

@ -1441,14 +1441,12 @@ target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
*
* Preserves the value of @cmd->tag.
*/
void __target_init_cmd(
struct se_cmd *cmd,
const struct target_core_fabric_ops *tfo,
struct se_session *se_sess,
u32 data_length,
int data_direction,
int task_attr,
unsigned char *sense_buffer, u64 unpacked_lun)
void __target_init_cmd(struct se_cmd *cmd,
const struct target_core_fabric_ops *tfo,
struct se_session *se_sess, u32 data_length,
int data_direction, int task_attr,
unsigned char *sense_buffer, u64 unpacked_lun,
struct target_cmd_counter *cmd_cnt)
{
INIT_LIST_HEAD(&cmd->se_delayed_node);
INIT_LIST_HEAD(&cmd->se_qf_node);
@ -1468,6 +1466,7 @@ void __target_init_cmd(
cmd->sam_task_attr = task_attr;
cmd->sense_buffer = sense_buffer;
cmd->orig_fe_lun = unpacked_lun;
cmd->cmd_cnt = cmd_cnt;
if (!(cmd->se_cmd_flags & SCF_USE_CPUID))
cmd->cpuid = raw_smp_processor_id();
@ -1687,7 +1686,8 @@ int target_init_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
* target_core_fabric_ops->queue_status() callback
*/
__target_init_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, data_length,
data_dir, task_attr, sense, unpacked_lun);
data_dir, task_attr, sense, unpacked_lun,
se_sess->cmd_cnt);
/*
* Obtain struct se_cmd->cmd_kref reference. A second kref_get here is
@ -1982,7 +1982,8 @@ int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
BUG_ON(!se_tpg);
__target_init_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
0, DMA_NONE, TCM_SIMPLE_TAG, sense, unpacked_lun);
0, DMA_NONE, TCM_SIMPLE_TAG, sense, unpacked_lun,
se_sess->cmd_cnt);
/*
* FIXME: Currently expect caller to handle se_cmd->se_tmr_req
* allocation failure.
@ -2986,7 +2987,6 @@ EXPORT_SYMBOL(transport_generic_free_cmd);
*/
int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
{
struct se_session *se_sess = se_cmd->se_sess;
int ret = 0;
/*
@ -3003,11 +3003,9 @@ int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
* Users like xcopy do not use counters since they never do a stop
* and wait.
*/
if (se_sess->cmd_cnt) {
if (!percpu_ref_tryget_live(&se_sess->cmd_cnt->refcnt))
if (se_cmd->cmd_cnt) {
if (!percpu_ref_tryget_live(&se_cmd->cmd_cnt->refcnt))
ret = -ESHUTDOWN;
else
se_cmd->cmd_cnt = se_sess->cmd_cnt;
}
if (ret && ack_kref)
target_put_sess_cmd(se_cmd);

8
drivers/target/target_core_xcopy.c
View File

@ -591,8 +591,8 @@ static int target_xcopy_read_source(
(unsigned long long)src_lba, transfer_length_block, src_bytes);
__target_init_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, src_bytes,
DMA_FROM_DEVICE, 0, &xpt_cmd.sense_buffer[0], 0);
DMA_FROM_DEVICE, 0, &xpt_cmd.sense_buffer[0], 0,
NULL);
rc = target_xcopy_setup_pt_cmd(&xpt_cmd, xop, src_dev, &cdb[0],
remote_port);
if (rc < 0) {
@ -636,8 +636,8 @@ static int target_xcopy_write_destination(
(unsigned long long)dst_lba, transfer_length_block, dst_bytes);
__target_init_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, dst_bytes,
DMA_TO_DEVICE, 0, &xpt_cmd.sense_buffer[0], 0);
DMA_TO_DEVICE, 0, &xpt_cmd.sense_buffer[0], 0,
NULL);
rc = target_xcopy_setup_pt_cmd(&xpt_cmd, xop, dst_dev, &cdb[0],
remote_port);
if (rc < 0) {

4
drivers/usb/gadget/function/f_tcm.c
View File

@ -1054,7 +1054,7 @@ static void usbg_cmd_work(struct work_struct *work)
tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
cmd->prio_attr, cmd->sense_iu.sense,
cmd->unpacked_lun);
cmd->unpacked_lun, NULL);
goto out;
}
@ -1183,7 +1183,7 @@ static void bot_cmd_work(struct work_struct *work)
tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
cmd->prio_attr, cmd->sense_iu.sense,
cmd->unpacked_lun);
cmd->unpacked_lun, NULL);
goto out;
}

8
include/target/target_core_fabric.h
View File

@ -151,9 +151,11 @@ void transport_deregister_session_configfs(struct se_session *);
void transport_deregister_session(struct se_session *);
void __target_init_cmd(struct se_cmd *,
const struct target_core_fabric_ops *,
struct se_session *, u32, int, int, unsigned char *, u64);
void __target_init_cmd(struct se_cmd *cmd,
const struct target_core_fabric_ops *tfo,
struct se_session *sess, u32 data_length, int data_direction,
int task_attr, unsigned char *sense_buffer, u64 unpacked_lun,
struct target_cmd_counter *cmd_cnt);
int target_init_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
unsigned char *sense, u64 unpacked_lun, u32 data_length,
int task_attr, int data_dir, int flags);