linux-kernel - Re: [PATCH v2 10/15] NTB: ntb_test: Update ntb

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Date:   Tue, 5 Dec 2017 13:27:57 -0500
From:   Jon Mason <jdmason@...zu.us>
To:     Serge Semin <fancer.lancer@...il.com>
Cc:     Dave Jiang <dave.jiang@...el.com>,
        "Hubbe, Allen" <Allen.Hubbe@....com>,
        "S-k, Shyam-sundar" <Shyam-sundar.S-k@....com>,
        "Yu, Xiangliang" <Xiangliang.Yu@....com>,
        Gary R Hook <gary.hook@....com>, Sergey.Semin@...latforms.ru,
        linux-ntb <linux-ntb@...glegroups.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 10/15] NTB: ntb_test: Update ntb_tool DB tests

On Sun, Dec 3, 2017 at 2:17 PM, Serge Semin <fancer.lancer@...il.com> wrote:
> DB interface of ntb_tool driver hasn't been changed much, but
> db_valid_mask DebugFS file has still been added to new ntb_tool
> driver. In this case it's much better to test all valid DB bits
> instead of using the predefined mask, which may be incorrect in
> general.
>
> Signed-off-by: Serge Semin <fancer.lancer@...il.com>
> ---
>  tools/testing/selftests/ntb/ntb_test.sh | 29 ++++++++++++++++++-----------
>  1 file changed, 18 insertions(+), 11 deletions(-)
>
> diff --git a/tools/testing/selftests/ntb/ntb_test.sh b/tools/testing/selftests/ntb/ntb_test.sh
> index 247458c6d8dc..3d43885ea4b5 100755
> --- a/tools/testing/selftests/ntb/ntb_test.sh
> +++ b/tools/testing/selftests/ntb/ntb_test.sh
> @@ -18,7 +18,6 @@ LIST_DEVS=FALSE
>
>  DEBUGFS=${DEBUGFS-/sys/kernel/debug}
>
> -DB_BITMASK=0x7FFF
>  PERF_RUN_ORDER=32
>  MAX_MW_SIZE=0
>  RUN_DMA_TESTS=
> @@ -39,7 +38,6 @@ function show_help()
>         echo "be highly recommended."
>         echo
>         echo "Options:"
> -       echo "  -b BITMASK      doorbell clear bitmask for ntb_tool"
>         echo "  -C              don't cleanup ntb modules on exit"
>         echo "  -d              run dma tests"
>         echo "  -h              show this help message"
> @@ -56,7 +54,6 @@ function parse_args()
>         OPTIND=0
>         while getopts "b:Cdhlm:r:p:w:" opt; do
>                 case "$opt" in
> -               b)  DB_BITMASK=${OPTARG} ;;
>                 C)  DONT_CLEANUP=1 ;;
>                 d)  RUN_DMA_TESTS=1 ;;
>                 h)  show_help; exit 0 ;;
> @@ -215,21 +212,30 @@ function doorbell_test()
>
>         echo "Running db tests on: $(basename $LOC) / $(basename $REM)"
>
> -       write_file "c $DB_BITMASK" "$REM/db"
> +       DB_VALID_MASK=$(read_file "$LOC/db_valid_mask")
>
> -       for ((i=1; i <= 8; i++)); do
> -               let DB=$(read_file "$REM/db") || true
> -               if [[ "$DB" != "$EXP" ]]; then
> +       write_file "c $DB_VALID_MASK" "$REM/db"
> +
> +       for ((i = 0; i < 64; i++)); do

I'm guessing this should be a tunable variable, for those systems with
a different number of doorbells.


> +               DB=$(read_file "$REM/db")
> +               if [[ "$DB" -ne "$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
> +               let "MASK = (1 << $i) & $DB_VALID_MASK" || true
> +               let "EXP = $EXP | $MASK" || true
> +
>                 write_file "s $MASK" "$LOC/peer_db"
>         done
>
> +       write_file "c $DB_VALID_MASK" "$REM/db_mask"
> +       write_file $DB_VALID_MASK "$REM/db_event"
> +       write_file "s $DB_VALID_MASK" "$REM/db_mask"
> +
> +       write_file "c $DB_VALID_MASK" "$REM/db"
> +
>         echo "  Passed"
>  }
>
> @@ -393,14 +399,15 @@ function ntb_tool_tests()
>         write_file "Y" "$LOCAL_PEER_TOOL/link_event"
>         write_file "Y" "$REMOTE_PEER_TOOL/link_event"
>
> +       doorbell_test "$LOCAL_TOOL" "$REMOTE_TOOL"
> +       doorbell_test "$REMOTE_TOOL" "$LOCAL_TOOL"
> +
>         for PEER_TRANS in $(ls "$LOCAL_TOOL"/peer_trans*); do
>                 PT=$(basename $PEER_TRANS)
>                 write_file $MW_SIZE "$LOCAL_TOOL/$PT"
>                 write_file $MW_SIZE "$REMOTE_TOOL/$PT"
>         done
>
> -       doorbell_test "$LOCAL_TOOL" "$REMOTE_TOOL"
> -       doorbell_test "$REMOTE_TOOL" "$LOCAL_TOOL"
>         scratchpad_test "$LOCAL_TOOL" "$REMOTE_TOOL"
>         scratchpad_test "$REMOTE_TOOL" "$LOCAL_TOOL"
>
> --
> 2.12.0
>