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target: Enable READ_STRIP emulation in target_complete_ok_work 

This patch enables the use of READ_STRIP software emulation in
target_complete_ok_work() code for I/O READs.

This is useful when the fabric does not support READ_STRIP hardware
offload, but would still like to interact with backend device
that have T10 PI enabled.

v2 changes:
   - Move TARGET_PROT_DIN_STRIP check from target_check_read_strip()
     into target_complete_ok_work() (Sagi)

Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Cc: Quinn Tran <quinn.tran@qlogic.com>
Cc: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2014-04-02 14:55:33 -07:00
parent 395ccb2531
commit bc0058695a
1 changed files with 31 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
drivers/target/target_core_transport.c
View File

@ -1905,6 +1905,21 @@ static void transport_handle_queue_full(
schedule_work(&cmd->se_dev->qf_work_queue);
}
static bool target_check_read_strip(struct se_cmd *cmd)
{
sense_reason_t rc;
if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
rc = sbc_dif_read_strip(cmd);
if (rc) {
cmd->pi_err = rc;
return true;
}
}
return false;
}
static void target_complete_ok_work(struct work_struct *work)
{
struct se_cmd *cmd = container_of(work, struct se_cmd, work);
@ -1969,6 +1984,22 @@ static void target_complete_ok_work(struct work_struct *work)
cmd->data_length;
}
spin_unlock(&cmd->se_lun->lun_sep_lock);
/*
* Perform READ_STRIP of PI using software emulation when
* backend had PI enabled, if the transport will not be
* performing hardware READ_STRIP offload.
*/
if (cmd->prot_op == TARGET_PROT_DIN_STRIP &&
target_check_read_strip(cmd)) {
ret = transport_send_check_condition_and_sense(cmd,
cmd->pi_err, 0);
if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
transport_lun_remove_cmd(cmd);
transport_cmd_check_stop_to_fabric(cmd);
return;
}
trace_target_cmd_complete(cmd);
ret = cmd->se_tfo->queue_data_in(cmd);