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target: Avoid DataIN transfers for non-GOOD SAM status 

This patch modifies existing transport_complete_*() code
to avoid invoking target_core_fabric_ops->queue_data_in()
driver callbacks for I/O READs with non-GOOD SAM status.

Some initiators expect GOOD status when a DATA-IN payload
transfer is involved, so to be safe go ahead and always
invoke target_core_fabric_ops->queue_status() to generate
fabric responses instead.

Note this is a prerequisite for IBLOCK supporting retriable
status, so SAM_STAT_BUSY + SAM_STAT_TASK_SET_FULL always
generates fabric driver responses instead of initiating
DataIN payload transfer when non-GOOD status is present

Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Andy Grover <agrover@redhat.com>
Cc: Mike Christie <mchristi@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2016-03-04 22:30:52 -08:00
parent 32c76de346
commit 4347ab5a08
1 changed files with 8 additions and 0 deletions
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8
drivers/target/target_core_transport.c
View File

@ -1997,6 +1997,9 @@ static void transport_complete_qf(struct se_cmd *cmd)
switch (cmd->data_direction) {
case DMA_FROM_DEVICE:
if (cmd->scsi_status)
goto queue_status;
trace_target_cmd_complete(cmd);
ret = cmd->se_tfo->queue_data_in(cmd);
break;
@ -2007,6 +2010,7 @@ static void transport_complete_qf(struct se_cmd *cmd)
}
/* Fall through for DMA_TO_DEVICE */
case DMA_NONE:
queue_status:
trace_target_cmd_complete(cmd);
ret = cmd->se_tfo->queue_status(cmd);
break;
@ -2128,6 +2132,9 @@ static void target_complete_ok_work(struct work_struct *work)
queue_rsp:
switch (cmd->data_direction) {
case DMA_FROM_DEVICE:
if (cmd->scsi_status)
goto queue_status;
atomic_long_add(cmd->data_length,
&cmd->se_lun->lun_stats.tx_data_octets);
/*
@ -2167,6 +2174,7 @@ queue_rsp:
}
/* Fall through for DMA_TO_DEVICE */
case DMA_NONE:
queue_status:
trace_target_cmd_complete(cmd);
ret = cmd->se_tfo->queue_status(cmd);
if (ret == -EAGAIN || ret == -ENOMEM)