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| -rw-r--r-- | Documentation/scsi/tcm_qla2xxx.rst | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/Documentation/scsi/tcm_qla2xxx.rst b/Documentation/scsi/tcm_qla2xxx.rst new file mode 100644 index 000000000..91bc1fcd3 --- /dev/null +++ b/Documentation/scsi/tcm_qla2xxx.rst @@ -0,0 +1,36 @@ +.. SPDX-License-Identifier: GPL-2.0 + +======================== +tcm_qla2xxx Driver Notes +======================== + +tcm_qla2xxx jam_host attribute +------------------------------ +There is now a new module endpoint atribute called jam_host +attribute:: + + jam_host: boolean=0/1 + +This attribute and accompanying code is only included if the +Kconfig parameter TCM_QLA2XXX_DEBUG is set to Y + +By default this jammer code and functionality is disabled + +Use this attribute to control the discarding of SCSI commands to a +selected host. + +This may be useful for testing error handling and simulating slow drain +and other fabric issues. + +Setting a boolean of 1 for the jam_host attribute for a particular host +will discard the commands for that host. + +Reset back to 0 to stop the jamming. + +Enable host 4 to be jammed:: + + echo 1 > /sys/kernel/config/target/qla2xxx/21:00:00:24:ff:27:8f:ae/tpgt_1/attrib/jam_host + +Disable jamming on host 4:: + + echo 0 > /sys/kernel/config/target/qla2xxx/21:00:00:24:ff:27:8f:ae/tpgt_1/attrib/jam_host |