projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| e92c45d2 MCC |
1 | .. SPDX-License-Identifier: GPL-2.0 |
| 2 | ||
| 3 | ======================== | |
| 4 | tcm_qla2xxx Driver Notes | |
| 5 | ======================== | |
| 6 | ||
| 54a5e73f LO |
7 | tcm_qla2xxx jam_host attribute |
| 8 | ------------------------------ | |
| cf065a7d | 9 | There is now a new module endpoint attribute called jam_host |
| e92c45d2 MCC |
10 | attribute:: |
| 11 | ||
| 12 | jam_host: boolean=0/1 | |
| 13 | ||
| 54a5e73f LO |
14 | This attribute and accompanying code is only included if the |
| 15 | Kconfig parameter TCM_QLA2XXX_DEBUG is set to Y | |
| e92c45d2 | 16 | |
| 54a5e73f LO |
17 | By default this jammer code and functionality is disabled |
| 18 | ||
| 19 | Use this attribute to control the discarding of SCSI commands to a | |
| 20 | selected host. | |
| e92c45d2 | 21 | |
| 54a5e73f LO |
22 | This may be useful for testing error handling and simulating slow drain |
| 23 | and other fabric issues. | |
| 24 | ||
| 25 | Setting a boolean of 1 for the jam_host attribute for a particular host | |
| e92c45d2 MCC |
26 | will discard the commands for that host. |
| 27 | ||
| 54a5e73f LO |
28 | Reset back to 0 to stop the jamming. |
| 29 | ||
| e92c45d2 MCC |
30 | Enable 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 | ||
| 34 | Disable jamming on host 4:: | |
| 54a5e73f | 35 | |
| e92c45d2 | 36 | echo 0 > /sys/kernel/config/target/qla2xxx/21:00:00:24:ff:27:8f:ae/tpgt_1/attrib/jam_host |