#
# Common parameter parsing for pktgen scripts
#

function usage() {
    echo ""
    echo "Usage: $0 [-vx] -i ethX"
    echo "  -i : (\$DEV)       output interface/device (required)"
    echo "  -s : (\$PKT_SIZE)  packet size"
    echo "  -d : (\$DEST_IP)   destination IP"
    echo "  -m : (\$DST_MAC)   destination MAC-addr"
    echo "  -t : (\$THREADS)   threads to start"
    echo "  -c : (\$SKB_CLONE) SKB clones send before alloc new SKB"
    echo "  -b : (\$BURST)     HW level bursting of SKBs"
    echo "  -v : (\$VERBOSE)   verbose"
    echo "  -x : (\$DEBUG)     debug"
    echo "  -6 : (\$IP6)       IPv6"
    echo ""
}

##  --- Parse command line arguments / parameters ---
## echo "Commandline options:"
while getopts "s:i:d:m:t:c:b:vxh6" option; do
    case $option in
        i) # interface
          export DEV=$OPTARG
	  info "Output device set to: DEV=$DEV"
          ;;
        s)
          export PKT_SIZE=$OPTARG
	  info "Packet size set to: PKT_SIZE=$PKT_SIZE bytes"
          ;;
        d) # destination IP
          export DEST_IP=$OPTARG
	  info "Destination IP set to: DEST_IP=$DEST_IP"
          ;;
        m) # MAC
          export DST_MAC=$OPTARG
	  info "Destination MAC set to: DST_MAC=$DST_MAC"
          ;;
        t)
	  export THREADS=$OPTARG
          export CPU_THREADS=$OPTARG
	  let "CPU_THREADS -= 1"
	  info "Number of threads to start: $THREADS (0 to $CPU_THREADS)"
          ;;
        c)
	  export CLONE_SKB=$OPTARG
	  info "CLONE_SKB=$CLONE_SKB"
          ;;
        b)
	  export BURST=$OPTARG
	  info "SKB bursting: BURST=$BURST"
          ;;
        v)
          export VERBOSE=yes
          info "Verbose mode: VERBOSE=$VERBOSE"
          ;;
        x)
          export DEBUG=yes
          info "Debug mode: DEBUG=$DEBUG"
          ;;
	6)
	  export IP6=6
	  info "IP6: IP6=$IP6"
	  ;;
        h|?|*)
          usage;
          err 2 "[ERROR] Unknown parameters!!!"
    esac
done
shift $(( $OPTIND - 1 ))

if [ -z "$PKT_SIZE" ]; then
    # NIC adds 4 bytes CRC
    export PKT_SIZE=60
    info "Default packet size set to: set to: $PKT_SIZE bytes"
fi

if [ -z "$THREADS" ]; then
    # Zero CPU threads means one thread, because CPU numbers are zero indexed
    export CPU_THREADS=0
    export THREADS=1
fi

if [ -z "$DEV" ]; then
    usage
    err 2 "Please specify output device"
fi

if [ -z "$DST_MAC" ]; then
    warn "Missing destination MAC address"
fi

if [ -z "$DEST_IP" ]; then
    warn "Missing destination IP address"
fi

if [ ! -d /proc/net/pktgen ]; then
    info "Loading kernel module: pktgen"
    modprobe pktgen
fi
e='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=3e03d7ccf4418c87a134bbfa79c05090296767f7'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/net?h=nds-private-remove&amp;id=3e03d7ccf4418c87a134bbfa79c05090296767f7'>net</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/ipv6?h=nds-private-remove&amp;id=3e03d7ccf4418c87a134bbfa79c05090296767f7'>ipv6</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/ipv6/protocol.c?h=nds-private-remove&amp;id=3e03d7ccf4418c87a134bbfa79c05090296767f7'>protocol.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/net/ipv6/protocol.c?h=nds-private-remove&amp;id=3e03d7ccf4418c87a134bbfa79c05090296767f7&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
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<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-29 13:50:06 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-29 13:50:06 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/fs/xfs/libxfs/xfs_fs.h?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>39cb2c9a316e77f6dfba96c543e55b6672d5a37e</a> (<a href='/cgit.cgi/linux/net-next.git/patch/fs/xfs/libxfs/xfs_fs.h?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>98fe974ee4e20121253de7f61fc8d01bdb3821c1</a> /<a href='/cgit.cgi/linux/net-next.git/tree/fs/xfs/libxfs/xfs_fs.h?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>fs/xfs/libxfs/xfs_fs.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/fs/xfs/libxfs/xfs_fs.h?id=2c5d9555d6d937966d79d4c6529a5f7b9206e405'>2c5d9555d6d937966d79d4c6529a5f7b9206e405</a> (<a href='/cgit.cgi/linux/net-next.git/diff/fs/xfs/libxfs/xfs_fs.h?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e&amp;id2=2c5d9555d6d937966d79d4c6529a5f7b9206e405'>diff</a>)</td></tr></table>
<div class='commit-subject'>drm/i915: Check for NULL i915_vma in intel_unpin_fb_obj()</div><div class='commit-msg'>I've seen this trigger twice now, where the i915_gem_object_to_ggtt()
call in intel_unpin_fb_obj() returns NULL, resulting in an oops
immediately afterwards as the (inlined) call to i915_vma_unpin_fence()
tries to dereference it.

It seems to be some race condition where the object is going away at
shutdown time, since both times happened when shutting down the X
server.  The call chains were different:

 - VT ioctl(KDSETMODE, KD_TEXT):

    intel_cleanup_plane_fb+0x5b/0xa0 [i915]
    drm_atomic_helper_cleanup_planes+0x6f/0x90 [drm_kms_helper]
    intel_atomic_commit_tail+0x749/0xfe0 [i915]
    intel_atomic_commit+0x3cb/0x4f0 [i915]
    drm_atomic_commit+0x4b/0x50 [drm]
    restore_fbdev_mode+0x14c/0x2a0 [drm_kms_helper]
    drm_fb_helper_restore_fbdev_mode_unlocked+0x34/0x80 [drm_kms_helper]
    drm_fb_helper_set_par+0x2d/0x60 [drm_kms_helper]
    intel_fbdev_set_par+0x18/0x70 [i915]
    fb_set_var+0x236/0x460
    fbcon_blank+0x30f/0x350
    do_unblank_screen+0xd2/0x1a0
    vt_ioctl+0x507/0x12a0
    tty_ioctl+0x355/0xc30
    do_vfs_ioctl+0xa3/0x5e0
    SyS_ioctl+0x79/0x90
    entry_SYSCALL_64_fastpath+0x13/0x94

 - i915 unpin_work workqueue:

    intel_unpin_work_fn+0x58/0x140 [i915]
    process_one_work+0x1f1/0x480
    worker_thread+0x48/0x4d0
    kthread+0x101/0x140

and this patch purely papers over the issue by adding a NULL pointer
check and a WARN_ON_ONCE() to avoid the oops that would then generally
make the machine unresponsive.

Other callers of i915_gem_object_to_ggtt() seem to also check for the
returned pointer being NULL and warn about it, so this clearly has
happened before in other places.

[ Reported it originally to the i915 developers on Jan 8, applying the
  ugly workaround on my own now after triggering the problem for the
  second time with no feedback.

  This is likely to be the same bug reported as

     https://bugs.freedesktop.org/show_bug.cgi?id=98829
     https://bugs.freedesktop.org/show_bug.cgi?id=99134

  which has a patch for the underlying problem, but it hasn't gotten to
  me, so I'm applying the workaround. ]

Cc: Daniel Vetter &lt;daniel.vetter@intel.com&gt;
Cc: Jani Nikula &lt;jani.nikula@linux.intel.com&gt;
Cc: Ville Syrjälä &lt;ville.syrjala@linux.intel.com&gt;
Cc: Chris Wilson &lt;chris@chris-wilson.co.uk&gt;
Cc: Maarten Lankhorst &lt;maarten.lankhorst@linux.intel.com&gt;
Cc: Tvrtko Ursulin &lt;tvrtko.ursulin@intel.com&gt;
Cc: Imre Deak &lt;imre.deak@intel.com&gt;
Signed-off-by: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>Diffstat</a> (limited to 'fs/xfs/libxfs/xfs_fs.h')</div><table summary='diffstat' class='diffstat'>