| Mauro Carvalho Chehab | e92c45d | 2020-03-02 09:16:12 +0100 | [diff] [blame] | 1 | .. SPDX-License-Identifier: GPL-2.0 |
| 2 | |
| 3 | ======================== |
| 4 | tcm_qla2xxx Driver Notes |
| 5 | ======================== |
| 6 | |
| 7 | tcm_qla2xxx jam_host attribute |
| 8 | ------------------------------ |
| 9 | There is now a new module endpoint atribute called jam_host |
| 10 | attribute:: |
| 11 | |
| 12 | jam_host: boolean=0/1 |
| 13 | |
| 14 | This attribute and accompanying code is only included if the |
| 15 | Kconfig parameter TCM_QLA2XXX_DEBUG is set to Y |
| 16 | |
| 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. |
| 21 | |
| 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 |
| 26 | will discard the commands for that host. |
| 27 | |
| 28 | Reset back to 0 to stop the jamming. |
| 29 | |
| 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:: |
| 35 | |
| 36 | echo 0 > /sys/kernel/config/target/qla2xxx/21:00:00:24:ff:27:8f:ae/tpgt_1/attrib/jam_host |