Date:	Tue, 14 Jun 2016 10:06:51 -0400
From:	Jon Mason <jdmason@...zu.us>
To:	Logan Gunthorpe <logang@...tatee.com>
Cc:	Dave Jiang <dave.jiang@...el.com>,
	Allen Hubbe <Allen.Hubbe@....com>,
	Shuah Khan <shuahkh@....samsung.com>,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ntb@...glegroups.com, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 8/8] ntb_test: Add a selftest script for the NTB subsystem

On Fri, Jun 10, 2016 at 6:54 PM, Logan Gunthorpe <logang@...tatee.com> wrote:
> This script automates testing doorbells, scratchpads and memory windows
> for an NTB device. It can be run locally, with the NTB looped
> back to the same host or use SSH to remotely control the second host.
>
> In the single host case, the script just needs to be passed two
> arguments: a PCI ID for each side of the link. In the two host case
> the -r option must be used to specify the remote hostname (which must
> be SSH accessible and should probably have ssh-keys exchanged).

I appreciate the work that you are putting in here, but test shell
scripts are not accepted into the kernel source.

I think a better place for this to be shared would be on the github
account wiki, https://github.com/jonmason/ntb/wiki
In fact, I'd really like for someone to add some pages there on using
the ntb tools and testing.  If you are willing, I'd be most
appreciative.

Thanks,
Jon

>
> A sample run looks like this:
>
> $ sudo ./ntb_test.sh 0000:03:00.1 0000:83:00.1 -p 29
> Starting ntb_tool tests...
> Running db tests on: 0000:03:00.1 / 0000:83:00.1
>   Passed
> Running db tests on: 0000:83:00.1 / 0000:03:00.1
>   Passed
> Running spad tests on: 0000:03:00.1 / 0000:83:00.1
>   Passed
> Running spad tests on: 0000:83:00.1 / 0000:03:00.1
>   Passed
> Running mw0 tests on: 0000:03:00.1 / 0000:83:00.1
>   Passed
> Running mw0 tests on: 0000:83:00.1 / 0000:03:00.1
>   Passed
> Running mw1 tests on: 0000:03:00.1 / 0000:83:00.1
>   Passed
> Running mw1 tests on: 0000:83:00.1 / 0000:03:00.1
>   Passed
>
> Starting ntb_pingpong tests...
> Running ping pong tests on: 0000:03:00.1 / 0000:83:00.1
>   Passed
>
> Starting ntb_perf tests...
> Running local perf test without DMA
>   0: copied 536870912 bytes in 238205 usecs, 2253 MBytes/s
>   Passed
> Running remote perf test without DMA
>   0: copied 536870912 bytes in 238205 usecs, 2253 MBytes/s
>   Passed
>
> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
> ---
>  MAINTAINERS                             |   1 +
>  tools/testing/selftests/ntb/ntb_test.sh | 386 ++++++++++++++++++++++++++++++++
>  2 files changed, 387 insertions(+)
>  create mode 100755 tools/testing/selftests/ntb/ntb_test.sh
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 9c567a4..f178e7e 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -7846,6 +7846,7 @@ F:        drivers/ntb/
>  F:     drivers/net/ntb_netdev.c
>  F:     include/linux/ntb.h
>  F:     include/linux/ntb_transport.h
> +F:     tools/testing/selftests/ntb/
>
>  NTB INTEL DRIVER
>  M:     Jon Mason <jdmason@...zu.us>
> diff --git a/tools/testing/selftests/ntb/ntb_test.sh b/tools/testing/selftests/ntb/ntb_test.sh
> new file mode 100755
> index 0000000..e4a89e9
> --- /dev/null
> +++ b/tools/testing/selftests/ntb/ntb_test.sh
> @@ -0,0 +1,386 @@
> +#!/bin/bash
> +# Copyright (c) 2016 Microsemi. All Rights Reserved.
> +#
> +# This program is free software; you can redistribute it and/or
> +# modify it under the terms of the GNU General Public License as
> +# published by the Free Software Foundation; either version 2 of
> +# the License, or (at your option) any later version.
> +#
> +# This program is distributed in the hope that it would be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +# GNU General Public License for more details.
> +#
> +# Author: Logan Gunthorpe <logang@...tatee.com>
> +
> +REMOTE_HOST=
> +LIST_DEVS=FALSE
> +
> +DEBUGFS=${DEBUGFS-/sys/kernel/debug}
> +
> +PERF_RUN_ORDER=32
> +MAX_MW_SIZE=0
> +RUN_DMA_TESTS=
> +DONT_CLEANUP=
> +
> +function show_help()
> +{
> +       echo "Usage: $0 [OPTIONS] LOCAL_DEV REMOTE_DEV"
> +       echo "Run tests on a pair of NTB endpoints."
> +       echo
> +       echo "If the NTB device loops back to the same host then,"
> +       echo "just specifying the two PCI ids on the command line is"
> +       echo "sufficient. Otherwise, if the NTB link spans two hosts"
> +       echo "use the -r option to specify the hostname for the remote"
> +       echo "device. SSH will then be used to test the remote side."
> +       echo "An SSH key between the root users of the host would then"
> +       echo "be highly recommended."
> +       echo
> +       echo "Options:"
> +       echo "  -C              don't cleanup ntb modules on exit"
> +       echo "  -d              run dma tests"
> +       echo "  -h              show this help message"
> +       echo "  -l              list available local and remote PCI ids"
> +       echo "  -r REMOTE_HOST  specify the remote's hostname to connect"
> +        echo "                  to for the test (using ssh)"
> +       echo "  -p NUM          ntb_perf run order (default: $PERF_RUN_ORDER)"
> +       echo "  -w max_mw_size  maxmium memory window size"
> +       echo
> +}
> +
> +function parse_args()
> +{
> +       OPTIND=0
> +       while getopts "Cdhlr:p:w:" opt; do
> +               case "$opt" in
> +               C)  DONT_CLEANUP=1 ;;
> +               d)  RUN_DMA_TESTS=1 ;;
> +               h)  show_help; exit 0 ;;
> +               l)  LIST_DEVS=TRUE ;;
> +               r)  REMOTE_HOST=${OPTARG} ;;
> +               p)  PERF_RUN_ORDER=${OPTARG} ;;
> +               w)  MAX_MW_SIZE=${OPTARG} ;;
> +               \?)
> +                   echo "Invalid option: -$OPTARG" >&2
> +                   exit 1
> +                   ;;
> +               esac
> +       done
> +}
> +
> +parse_args "$@"
> +shift $((OPTIND-1))
> +LOCAL_DEV=$1
> +shift
> +parse_args "$@"
> +shift $((OPTIND-1))
> +REMOTE_DEV=$1
> +shift
> +parse_args "$@"
> +
> +set -e
> +
> +function _modprobe()
> +{
> +        modprobe "$@"
> +}
> +
> +function split_remote()
> +{
> +       VPATH=$1
> +       REMOTE=
> +
> +       if [[ "$VPATH" == *":/"* ]]; then
> +               REMOTE=${VPATH%%:*}
> +               VPATH=${VPATH#*:}
> +       fi
> +}
> +
> +function read_file()
> +{
> +       split_remote $1
> +       if [[ "$REMOTE" != "" ]]; then
> +               ssh "$REMOTE" cat "$VPATH"
> +       else
> +               cat "$VPATH"
> +       fi
> +}
> +
> +function write_file()
> +{
> +       split_remote $2
> +       VALUE=$1
> +
> +       if [[ "$REMOTE" != "" ]]; then
> +               ssh "$REMOTE" "echo \"$VALUE\" > \"$VPATH\""
> +       else
> +               echo "$VALUE" > "$VPATH"
> +       fi
> +}
> +
> +function doorbell_test()
> +{
> +       LOC=$1
> +       REM=$2
> +       EXP=0
> +
> +       echo "Running db tests on: $(basename $LOC) / $(basename $REM)"
> +
> +       write_file "c 0xFFFFFFFF" "$REM/db"
> +
> +       for ((i=1; i <= 8; i++)); do
> +               let DB=$(read_file "$REM/db") || true
> +               if [[ "$DB" != "$EXP" ]]; then
> +                       echo "Doorbell doesn't match expected value $EXP " \
> +                            "in $REM/db" >&2
> +                       exit -1
> +               fi
> +
> +               let "MASK=1 << ($i-1)" || true
> +               let "EXP=$EXP | $MASK" || true
> +               write_file "s $MASK" "$LOC/peer_db"
> +       done
> +
> +       echo "  Passed"
> +}
> +
> +function read_spad()
> +{
> +       VPATH=$1
> +       IDX=$2
> +
> +       ROW=($(read_file "$VPATH" | grep -e "^$IDX"))
> +       let VAL=${ROW[1]} || true
> +       echo $VAL
> +}
> +
> +function scratchpad_test()
> +{
> +       LOC=$1
> +       REM=$2
> +       CNT=$(read_file "$LOC/spad" | wc -l)
> +
> +       echo "Running spad tests on: $(basename $LOC) / $(basename $REM)"
> +
> +       for ((i = 0; i < $CNT; i++)); do
> +               VAL=$RANDOM
> +               write_file "$i $VAL" "$LOC/peer_spad"
> +               RVAL=$(read_spad "$REM/spad" $i)
> +
> +               if [[ "$VAL" != "$RVAL" ]]; then
> +                       echo "Scratchpad doesn't match expected value $VAL " \
> +                            "in $REM/spad, got $RVAL" >&2
> +                       exit -1
> +               fi
> +
> +       done
> +
> +       echo "  Passed"
> +}
> +
> +function write_mw()
> +{
> +       split_remote $2
> +
> +       if [[ "$REMOTE" != "" ]]; then
> +               ssh "$REMOTE" \
> +                       dd if=/dev/urandom "of=$VPATH" 2> /dev/null || true
> +       else
> +               dd if=/dev/urandom "of=$VPATH" 2> /dev/null || true
> +       fi
> +}
> +
> +function mw_test()
> +{
> +       IDX=$1
> +       LOC=$2
> +       REM=$3
> +
> +       echo "Running $IDX tests on: $(basename $LOC) / $(basename $REM)"
> +
> +       write_mw "$LOC/$IDX"
> +
> +       split_remote "$LOC/$IDX"
> +       if [[ "$REMOTE" == "" ]]; then
> +               A=$VPATH
> +       else
> +               A=/tmp/ntb_test.$$.A
> +               ssh "$REMOTE" cat "$VPATH" > "$A"
> +       fi
> +
> +       split_remote "$REM/peer_$IDX"
> +       if [[ "$REMOTE" == "" ]]; then
> +               B=$VPATH
> +       else
> +               B=/tmp/ntb_test.$$.B
> +               ssh "$REMOTE" cat "$VPATH" > "$B"
> +       fi
> +
> +       cmp "$A" "$B"
> +       if [[ $? != 0 ]]; then
> +               echo "Memory window $MW did not match!" >&2
> +       fi
> +
> +       if [[ "$A" == "/tmp/*" ]]; then
> +               rm "$A"
> +       fi
> +
> +       if [[ "$B" == "/tmp/*" ]]; then
> +               rm "$B"
> +       fi
> +
> +       echo "  Passed"
> +}
> +
> +function pingpong_test()
> +{
> +       LOC=$1
> +       REM=$2
> +
> +       echo "Running ping pong tests on: $(basename $LOC) / $(basename $REM)"
> +
> +       LOC_START=$(read_file $LOC/count)
> +       REM_START=$(read_file $REM/count)
> +
> +       sleep 7
> +
> +       LOC_END=$(read_file $LOC/count)
> +       REM_END=$(read_file $REM/count)
> +
> +       if [[ $LOC_START == $LOC_END ]] || [[ $REM_START == $REM_END ]]; then
> +               echo "Ping pong counter not incrementing!" >&2
> +               exit 1
> +       fi
> +
> +       echo "  Passed"
> +}
> +
> +function perf_test()
> +{
> +       USE_DMA=$1
> +
> +       if [[ $USE_DMA == "1" ]]; then
> +               WITH="with"
> +       else
> +               WITH="without"
> +       fi
> +
> +       _modprobe ntb_perf run_order=$PERF_RUN_ORDER \
> +               max_mw_size=$MAX_MW_SIZE use_dma=$USE_DMA
> +
> +       echo "Running local perf test $WITH DMA"
> +       write_file "" $LOCAL_PERF/run
> +       echo -n "  "
> +       read_file $LOCAL_PERF/run
> +       echo "  Passed"
> +
> +       echo "Running remote perf test $WITH DMA"
> +       write_file "" $REMOTE_PERF/run
> +       echo -n "  "
> +       read_file $LOCAL_PERF/run
> +       echo "  Passed"
> +
> +       _modprobe -r ntb_perf
> +}
> +
> +function ntb_tool_tests()
> +{
> +       LOCAL_TOOL=$DEBUGFS/ntb_tool/$LOCAL_DEV
> +       REMOTE_TOOL=$REMOTE_HOST:$DEBUGFS/ntb_tool/$REMOTE_DEV
> +
> +       echo "Starting ntb_tool tests..."
> +
> +       _modprobe ntb_tool
> +
> +       echo > $LOCAL_TOOL/link
> +
> +       doorbell_test $LOCAL_TOOL $REMOTE_TOOL
> +       doorbell_test $REMOTE_TOOL $LOCAL_TOOL
> +       scratchpad_test $LOCAL_TOOL $REMOTE_TOOL
> +       scratchpad_test $REMOTE_TOOL $LOCAL_TOOL
> +
> +       for MW in $(ls $LOCAL_TOOL/mw*); do
> +               MW=$(basename $MW)
> +               mw_test $MW $LOCAL_TOOL $REMOTE_TOOL
> +               mw_test $MW $REMOTE_TOOL $LOCAL_TOOL
> +       done
> +
> +       _modprobe -r ntb_tool
> +}
> +
> +function ntb_pingpong_tests()
> +{
> +       LOCAL_PP=$DEBUGFS/ntb_pingpong/$LOCAL_DEV
> +       REMOTE_PP=$REMOTE_HOST:$DEBUGFS/ntb_pingpong/$REMOTE_DEV
> +
> +       echo "Starting ntb_pingpong tests..."
> +
> +       _modprobe ntb_pingpong
> +
> +       pingpong_test $LOCAL_PP $REMOTE_PP
> +
> +       _modprobe -r ntb_pingpong
> +}
> +
> +function ntb_perf_tests()
> +{
> +       LOCAL_PERF=$DEBUGFS/ntb_perf/$LOCAL_DEV
> +       REMOTE_PERF=$REMOTE_HOST:$DEBUGFS/ntb_perf/$REMOTE_DEV
> +
> +       echo "Starting ntb_perf tests..."
> +
> +       perf_test 0
> +
> +       if [[ $RUN_DMA_TESTS ]]; then
> +               perf_test 1
> +       fi
> +}
> +
> +function cleanup()
> +{
> +       set +e
> +       _modprobe -r ntb_tool 2> /dev/null
> +       _modprobe -r ntb_perf 2> /dev/null
> +       _modprobe -r ntb_pingpong 2> /dev/null
> +       _modprobe -r ntb_transport 2> /dev/null
> +       set -e
> +}
> +
> +cleanup
> +
> +if ! [[ $$DONT_CLEANUP ]]; then
> +       trap cleanup EXIT
> +fi
> +
> +if [ "$(id -u)" != "0" ]; then
> +       echo "This script must be run as root" 1>&2
> +       exit 1
> +fi
> +
> +if [[ "$LIST_DEVS" == TRUE ]]; then
> +       _modprobe ntb_tool
> +       echo "Local Devices:"
> +       ls -1 /sys/kernel/debug/ntb_tool
> +       echo
> +
> +       if [[ "$REMOTE_HOST" != "" ]]; then
> +               echo "Remote Devices:"
> +               ssh $REMOTE_HOST ls -1 /sys/kernel/debug/ntb_tool
> +       fi
> +
> +       _modprobe -r ntb_tool
> +
> +       exit 0
> +fi
> +
> +if [[ "$LOCAL_DEV" == $"" ]] || [[ "$REMOTE_DEV" == $"" ]]; then
> +       show_help
> +       exit 1
> +fi
> +
> +ntb_tool_tests
> +echo
> +ntb_pingpong_tests
> +echo
> +ntb_perf_tests
> +echo
> --
> 2.1.4
>

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