tests/srp/014: Add a test that triggers a SCSI reset while I/O is ongoing

This test triggers the task management function handling code in the SRP
initiator and target drivers.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>

diff --git a/tests/srp/014 b/tests/srp/014
new file mode 100755 (executable)
index 0000000..8ecd8a4
--- /dev/null
+++ b/tests/srp/014
@@ -0,0 +1,107 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0+
+# Copyright (c) 2016-2018 Western Digital Corporation or its affiliates
+#
+# Submit SCSI resets while a fio --verify job is running. This is a regression
+# test for Linux kernel commit fd5614124406 ("scsi: RDMA/srp: Fix a
+# sleep-in-invalid-context bug") # v5.3.
+
+. tests/srp/rc
+
+DESCRIPTION="Run sg_reset while I/O is ongoing"
+TIMED=1
+
+# $1: SCSI device of which to change the state to running, e.g. sdc.
+make_running() {
+       local dev=$1 sp state
+
+       for sp in /sys/class/scsi_device/*/device/block/"$dev"; do
+               if [ -e "$sp" ]; then
+                       break
+               else
+                       return 1
+               fi
+       done
+       sp=$(dirname "$(dirname "$sp")")/state
+       # If the SCSI error handler changed the device state to offline,
+       # change the state back to running.
+       state=$(<"$sp")
+       if [ "$state" = offline ]; then
+               echo running > "$sp"
+               echo "$dev: state $state -> running" >>"$FULL"
+       else
+               echo "$dev: state $state" >>"$FULL"
+       fi
+}
+
+# $1: dm device to examine, e.g.
+# /dev/disk/by-id/dm-uuid-mpath-360014056e756c6c62300000000000000
+make_all_running() {
+       local d h dev=$1
+
+       while [ -L "$dev" ]; do
+               dev=$(realpath "$dev")
+       done
+       dev=${dev#/dev/}
+       for h in /sys/class/block/*/holders/"$dev"; do
+               [ -e "$h" ] || continue
+               d=$(basename "$(dirname "$(dirname "$h")")")
+               make_running "$d"
+       done
+}
+
+# $1: dm device to act on.
+set_running_loop() {
+       local dev="$1"
+
+       [ -e "$dev" ] || return $?
+       while true; do
+               sleep 1
+               make_all_running "$dev"
+       done
+       echo "set_running_loop $dev finished" >>"$FULL"
+}
+
+# $1: dm device to reset periodically; $2: how long the reset loop should run.
+sg_reset_loop() {
+       local cmd dev="$1" duration="$2" deadline i=0 reset_type
+
+       [ -e "$dev" ] || return $?
+       [ -n "$duration" ] || return $?
+       reset_type=(-d -b)
+       deadline=$(($(uptime_s) + duration))
+       while true; do
+               sleep_until 1 ${deadline} || break
+               cmd="sg_reset --no-esc ${reset_type[i++ % 2]} $dev"
+               { echo "+ $cmd"; eval "$cmd"; } >>"$FULL" 2>&1
+       done
+       echo "sg_reset_loop $dev finished" >>"$FULL"
+}
+
+test_sg_reset() {
+       local dev fio_status m job
+
+       use_blk_mq y y || return $?
+       dev=$(get_bdev 0) || return $?
+       sg_reset_loop "$dev" "$TIMEOUT" &
+       # Redirect stderr to suppress the bash "Terminated" message.
+       set_running_loop "$dev" 2>/dev/null &
+       job=$!
+       run_fio --verify=md5 --rw=randwrite --bs=64K --loops=$((10**6)) \
+               --iodepth=16 --group_reporting --sync=1 --direct=1 \
+               --ioengine=libaio --runtime="${TIMEOUT}" \
+               --filename="$dev" --name=sg-reset-test --thread --numjobs=1 \
+               --output="${RESULTS_DIR}/srp/fio-output-014.txt" \
+               >>"$FULL"
+       fio_status=$?
+       kill "$job"
+       make_all_running "$dev"
+       wait
+       return $fio_status
+}
+
+test() {
+       : "${TIMEOUT:=30}"
+       trap 'trap "" EXIT; teardown' EXIT
+       setup && test_sg_reset && echo Passed
+}

diff --git a/tests/srp/014.out b/tests/srp/014.out
new file mode 100644 (file)
index 0000000..5e25d8e
--- /dev/null
+++ b/tests/srp/014.out
@@ -0,0 +1,2 @@
+Configured SRP target driver
+Passed