1*4882a593Smuzhiyun.. SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun 3*4882a593Smuzhiyun======================== 4*4882a593Smuzhiyuntcm_qla2xxx Driver Notes 5*4882a593Smuzhiyun======================== 6*4882a593Smuzhiyun 7*4882a593Smuzhiyuntcm_qla2xxx jam_host attribute 8*4882a593Smuzhiyun------------------------------ 9*4882a593SmuzhiyunThere is now a new module endpoint atribute called jam_host 10*4882a593Smuzhiyunattribute:: 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun jam_host: boolean=0/1 13*4882a593Smuzhiyun 14*4882a593SmuzhiyunThis attribute and accompanying code is only included if the 15*4882a593SmuzhiyunKconfig parameter TCM_QLA2XXX_DEBUG is set to Y 16*4882a593Smuzhiyun 17*4882a593SmuzhiyunBy default this jammer code and functionality is disabled 18*4882a593Smuzhiyun 19*4882a593SmuzhiyunUse this attribute to control the discarding of SCSI commands to a 20*4882a593Smuzhiyunselected host. 21*4882a593Smuzhiyun 22*4882a593SmuzhiyunThis may be useful for testing error handling and simulating slow drain 23*4882a593Smuzhiyunand other fabric issues. 24*4882a593Smuzhiyun 25*4882a593SmuzhiyunSetting a boolean of 1 for the jam_host attribute for a particular host 26*4882a593Smuzhiyunwill discard the commands for that host. 27*4882a593Smuzhiyun 28*4882a593SmuzhiyunReset back to 0 to stop the jamming. 29*4882a593Smuzhiyun 30*4882a593SmuzhiyunEnable host 4 to be jammed:: 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun echo 1 > /sys/kernel/config/target/qla2xxx/21:00:00:24:ff:27:8f:ae/tpgt_1/attrib/jam_host 33*4882a593Smuzhiyun 34*4882a593SmuzhiyunDisable jamming on host 4:: 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun echo 0 > /sys/kernel/config/target/qla2xxx/21:00:00:24:ff:27:8f:ae/tpgt_1/attrib/jam_host 37