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