scsi: docs: convert tcm_qla2xxx.txt to ReST

Link: https://lore.kernel.org/r/de73fa02f38f67f54f22ef2842f9680c0b34434a.1583136624.git.mchehab+huawei@kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/Documentation/scsi/tcm_qla2xxx.rst b/Documentation/scsi/tcm_qla2xxx.rst
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+.. SPDX-License-Identifier: GPL-2.0
+
+========================
+tcm_qla2xxx Driver Notes
+========================
+
+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