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authorLaurence Oberman <loberman@redhat.com>2016-05-10 11:23:17 +0300
committerNicholas Bellinger <nab@linux-iscsi.org>2016-05-10 11:27:17 +0300
commit54a5e73f4d6e31d5628e08b4d575c71d71670e09 (patch)
treed328638aeb98baefb01a281f9e38f2371a3fdf61 /Documentation/scsi
parent2b16509c5f26d6c160bd89164cf18f18d713daf6 (diff)
downloadlinux-54a5e73f4d6e31d5628e08b4d575c71d71670e09.tar.xz
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 <loberman@redhat.com> Signed-off-by: Laurence Oberman <loberman@redhat.com> Acked-by: Himanshu Madhani <himanshu.madhani@qlogic.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'Documentation/scsi')
-rw-r--r--Documentation/scsi/tcm_qla2xxx.txt22
1 files changed, 22 insertions, 0 deletions
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
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+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