| Message ID | 20210726151646.32631-2-s.samoylenko@yadro.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | target: core: Fix sense key for invalid XCOPY request | expand |
Hi Sergey, On Mon, 26 Jul 2021 18:16:45 +0300, Sergey Samoylenko wrote: > Currently, backend drivers can fail IO with > SAM_STAT_CHECK_CONDITION which gets us > TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE. The patch adds > a new helper that allows backend drivers to fail with > specific sense codes. > > This is based on a patch from Mike Christie <michael.christie@oracle.com>. This looks good and works for me, but I have one comment... > Cc: Mike Christie <michael.christie@oracle.com> > Cc: David Disseldorp <ddiss@suse.de> > [ Moved target_complete_cmd_with_sense() helper to mainline ] > Signed-off-by: Sergey Samoylenko <s.samoylenko@yadro.com> > --- > drivers/target/target_core_transport.c | 21 ++++++++++++++++++--- > include/target/target_core_backend.h | 1 + > include/target/target_core_base.h | 2 ++ > 3 files changed, 21 insertions(+), 3 deletions(-) > > diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c > index 26ceabe34de5..d2a2892bda9c 100644 > --- a/drivers/target/target_core_transport.c > +++ b/drivers/target/target_core_transport.c > @@ -736,8 +736,7 @@ static void target_complete_failure_work(struct work_struct *work) > { > struct se_cmd *cmd = container_of(work, struct se_cmd, work); > > - transport_generic_request_failure(cmd, > - TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); > + transport_generic_request_failure(cmd, cmd->sense_reason); > } > > /* > @@ -855,7 +854,8 @@ static bool target_cmd_interrupted(struct se_cmd *cmd) > } > > /* May be called from interrupt context so must not sleep. */ > -void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) > +static void __target_complete_cmd(struct se_cmd *cmd, u8 scsi_status, > + sense_reason_t sense_reason) > { > struct se_wwn *wwn = cmd->se_sess->se_tpg->se_tpg_wwn; > int success, cpu; > @@ -865,6 +865,7 @@ void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) > return; > > cmd->scsi_status = scsi_status; > + cmd->sense_reason = sense_reason; > > spin_lock_irqsave(&cmd->t_state_lock, flags); > switch (cmd->scsi_status) { > @@ -893,8 +894,22 @@ void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) > > queue_work_on(cpu, target_completion_wq, &cmd->work); > } > + > +void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) > +{ > + __target_complete_cmd(cmd, scsi_status, scsi_status ? > + TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE : > + TCM_NO_SENSE); > +} > EXPORT_SYMBOL(target_complete_cmd); > > +void target_complete_cmd_with_sense(struct se_cmd *cmd, > + sense_reason_t sense_reason) > +{ > + __target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION, sense_reason); > +} > +EXPORT_SYMBOL(target_complete_cmd_with_sense); > + It's a little unclear from the function prototype that this actually fails the command with SAM_STAT_CHECK_CONDITION. I could imagine people erroneously calling target_complete_cmd_with_sense(cmd, TCM_NO_SENSE) and expecting success. I think it might be a bit clearer if you just export __target_complete_cmd() as target_complete_cmd_with_sense() with all three parameters and leave it up to the caller to flag CHECK_CONDITION. Cheers, David
Hi David, Sorry for the long answer. > Hi Sergey, > > On Mon, 26 Jul 2021 18:16:45 +0300, Sergey Samoylenko wrote: > >> Currently, backend drivers can fail IO with >> SAM_STAT_CHECK_CONDITION which gets us >> TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE. The patch adds >> a new helper that allows backend drivers to fail with >> specific sense codes. >> >> This is based on a patch from Mike Christie <michael.christie@oracle.com>. > > This looks good and works for me, but I have one comment... > > It's a little unclear from the function prototype that this actually > fails the command with SAM_STAT_CHECK_CONDITION. I could imagine people > erroneously calling target_complete_cmd_with_sense(cmd, TCM_NO_SENSE) > and expecting success. > I think it might be a bit clearer if you just export > __target_complete_cmd() as target_complete_cmd_with_sense() with all > three parameters and leave it up to the caller to flag > CHECK_CONDITION. > > Cheers, David David, am I getting the idea right? We want to get something like this: ----------------------------------------------------------------------------------- diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 7e35eddd9eb7..6dbfba7f16a6 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -736,8 +736,7 @@ static void target_complete_failure_work(struct work_struct *work) { struct se_cmd *cmd = container_of(work, struct se_cmd, work); - transport_generic_request_failure(cmd, - TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); + transport_generic_request_failure(cmd, cmd->sense_reason); } /* @@ -855,7 +854,8 @@ static bool target_cmd_interrupted(struct se_cmd *cmd) } /* May be called from interrupt context so must not sleep. */ -void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) +void target_complete_cmd_with_sense(struct se_cmd *cmd, u8 scsi_status, + sense_reason_t sense_reason) { struct se_wwn *wwn = cmd->se_sess->se_tpg->se_tpg_wwn; int success, cpu; @@ -865,6 +865,7 @@ void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) return; cmd->scsi_status = scsi_status; + cmd->sense_reason = sense_reason; spin_lock_irqsave(&cmd->t_state_lock, flags); switch (cmd->scsi_status) { @@ -893,6 +894,14 @@ void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) queue_work_on(cpu, target_completion_wq, &cmd->work); } +EXPORT_SYMBOL(target_complete_cmd_with_sense); + +void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) +{ + target_complete_cmd_with_sense(cmd, scsi_status, scsi_status ? + TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE : + TCM_NO_SENSE); +} EXPORT_SYMBOL(target_complete_cmd); void target_set_cmd_data_length(struct se_cmd *cmd, int length) ----------------------------------------------------------------------------------- Then we use it as follows: ----------------------------------------------------------------------------------- diff --git a/drivers/target/target_core_xcopy.c b/drivers/target/target_core_xcopy.c index 0f1319336f3e..1b4faafedb1a 100644 --- a/drivers/target/target_core_xcopy.c +++ b/drivers/target/target_core_xcopy.c @@ -674,12 +674,16 @@ static void target_xcopy_do_work(struct work_struct *work) ... err_free: kfree(xop); - /* - * Don't override an error scsi status if it has already been set - */ - if (ec_cmd->scsi_status == SAM_STAT_GOOD) { - pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY" - " CHECK_CONDITION -> sending response\n", rc); - ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION; - } - target_complete_cmd(ec_cmd, ec_cmd->scsi_status); + pr_warn_ratelimited("target_xcopy_do_work: rc: %d, sense: %u," + " XCOPY operation failed\n", rc, sense_rc); + target_complete_cmd_with_sense(ec_cmd, SAM_STAT_CHECK_CONDITION, sense_rc); } ----------------------------------------------------------------------------------- Best regards, Sergey
Hi Sergey, On Mon, 2 Aug 2021 18:31:06 +0000, Sergey Samoylenko wrote: > David, am I getting the idea right? > > We want to get something like this: [trimmed] Yes, this is my preference (with the corresponding .h changes). Please send it as a git-send-email patchset and feel free to add my reviewed-by tag. Cheers, David
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 26ceabe34de5..d2a2892bda9c 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -736,8 +736,7 @@ static void target_complete_failure_work(struct work_struct *work) { struct se_cmd *cmd = container_of(work, struct se_cmd, work); - transport_generic_request_failure(cmd, - TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); + transport_generic_request_failure(cmd, cmd->sense_reason); } /* @@ -855,7 +854,8 @@ static bool target_cmd_interrupted(struct se_cmd *cmd) } /* May be called from interrupt context so must not sleep. */ -void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) +static void __target_complete_cmd(struct se_cmd *cmd, u8 scsi_status, + sense_reason_t sense_reason) { struct se_wwn *wwn = cmd->se_sess->se_tpg->se_tpg_wwn; int success, cpu; @@ -865,6 +865,7 @@ void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) return; cmd->scsi_status = scsi_status; + cmd->sense_reason = sense_reason; spin_lock_irqsave(&cmd->t_state_lock, flags); switch (cmd->scsi_status) { @@ -893,8 +894,22 @@ void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) queue_work_on(cpu, target_completion_wq, &cmd->work); } + +void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) +{ + __target_complete_cmd(cmd, scsi_status, scsi_status ? + TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE : + TCM_NO_SENSE); +} EXPORT_SYMBOL(target_complete_cmd); +void target_complete_cmd_with_sense(struct se_cmd *cmd, + sense_reason_t sense_reason) +{ + __target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION, sense_reason); +} +EXPORT_SYMBOL(target_complete_cmd_with_sense); + void target_set_cmd_data_length(struct se_cmd *cmd, int length) { if (length < cmd->data_length) { diff --git a/include/target/target_core_backend.h b/include/target/target_core_backend.h index 1f78b09bba55..3cc50d30231a 100644 --- a/include/target/target_core_backend.h +++ b/include/target/target_core_backend.h @@ -75,6 +75,7 @@ void target_backend_unregister(const struct target_backend_ops *); void target_complete_cmd(struct se_cmd *, u8); void target_set_cmd_data_length(struct se_cmd *, int); +void target_complete_cmd_with_sense(struct se_cmd *, sense_reason_t); void target_complete_cmd_with_length(struct se_cmd *, u8, int); void transport_copy_sense_to_cmd(struct se_cmd *, unsigned char *); diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h index 85c16c266eac..8c85d3b83a70 100644 --- a/include/target/target_core_base.h +++ b/include/target/target_core_base.h @@ -453,6 +453,8 @@ enum target_core_dif_check { #define TCM_ACA_TAG 0x24 struct se_cmd { + /* Used for fail with specific sense codes */ + sense_reason_t sense_reason; /* SAM response code being sent to initiator */ u8 scsi_status; u8 scsi_asc;
Currently, backend drivers can fail IO with SAM_STAT_CHECK_CONDITION which gets us TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE. The patch adds a new helper that allows backend drivers to fail with specific sense codes. This is based on a patch from Mike Christie <michael.christie@oracle.com>. Cc: Mike Christie <michael.christie@oracle.com> Cc: David Disseldorp <ddiss@suse.de> [ Moved target_complete_cmd_with_sense() helper to mainline ] Signed-off-by: Sergey Samoylenko <s.samoylenko@yadro.com> --- drivers/target/target_core_transport.c | 21 ++++++++++++++++++--- include/target/target_core_backend.h | 1 + include/target/target_core_base.h | 2 ++ 3 files changed, 21 insertions(+), 3 deletions(-)