From 54a5e73f4d6e31d5628e08b4d575c71d71670e09 Mon Sep 17 00:00:00 2001 From: Laurence Oberman Date: Tue, 10 May 2016 01:23:17 -0700 Subject: tcm_qla2xxx Add SCSI command jammer/discard capability This patch introduces support for TCM_QLA2XXX_DEBUG and associated tcm_qla2xxx_tpg->tpg_attrib.jam_host checking used to test dropped packets to FC host environments. Tested by: Laurence Oberman Signed-off-by: Laurence Oberman Acked-by: Himanshu Madhani Signed-off-by: Nicholas Bellinger --- Documentation/scsi/tcm_qla2xxx.txt | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 Documentation/scsi/tcm_qla2xxx.txt (limited to 'Documentation') diff --git a/Documentation/scsi/tcm_qla2xxx.txt b/Documentation/scsi/tcm_qla2xxx.txt new file mode 100644 index 000000000000..c3a670a25e2b --- /dev/null +++ b/Documentation/scsi/tcm_qla2xxx.txt @@ -0,0 +1,22 @@ +tcm_qla2xxx jam_host attribute +------------------------------ +There is now a new module endpoint atribute called jam_host +attribute: jam_host: boolean=0/1 +This attribute and accompanying code is only included if the +Kconfig parameter TCM_QLA2XXX_DEBUG is set to Y +By default this jammer code and functionality is disabled + +Use this attribute to control the discarding of SCSI commands to a +selected host. +This may be useful for testing error handling and simulating slow drain +and other fabric issues. + +Setting a boolean of 1 for the jam_host attribute for a particular host + will discard the commands for that host. +Reset back to 0 to stop the jamming. + +Enable host 4 to be jammed +echo 1 > /sys/kernel/config/target/qla2xxx/21:00:00:24:ff:27:8f:ae/tpgt_1/attrib/jam_host + +Disable jamming on host 4 +echo 0 > /sys/kernel/config/target/qla2xxx/21:00:00:24:ff:27:8f:ae/tpgt_1/attrib/jam_host -- cgit v1.2.3