1.. SPDX-License-Identifier: GPL-2.0 2 3======================== 4tcm_qla2xxx Driver Notes 5======================== 6 7tcm_qla2xxx jam_host attribute 8------------------------------ 9There is now a new module endpoint atribute called jam_host 10attribute:: 11 12 jam_host: boolean=0/1 13 14This attribute and accompanying code is only included if the 15Kconfig parameter TCM_QLA2XXX_DEBUG is set to Y 16 17By default this jammer code and functionality is disabled 18 19Use this attribute to control the discarding of SCSI commands to a 20selected host. 21 22This may be useful for testing error handling and simulating slow drain 23and other fabric issues. 24 25Setting a boolean of 1 for the jam_host attribute for a particular host 26will discard the commands for that host. 27 28Reset back to 0 to stop the jamming. 29 30Enable host 4 to be jammed:: 31 32 echo 1 > /sys/kernel/config/target/qla2xxx/21:00:00:24:ff:27:8f:ae/tpgt_1/attrib/jam_host 33 34Disable jamming on host 4:: 35 36 echo 0 > /sys/kernel/config/target/qla2xxx/21:00:00:24:ff:27:8f:ae/tpgt_1/attrib/jam_host 37