Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 140 insertions, 0 deletions

diff --git a/tests/qemu-iotests/common.pattern b/tests/qemu-iotests/common.pattern
new file mode 100644
index 000000000..4caa5de18
--- /dev/null
+++ b/tests/qemu-iotests/common.pattern
@@ -0,0 +1,140 @@
+#!/usr/bin/env bash
+#
+# Copyright (C) 2009 Red Hat, Inc.
+#
+# 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 will 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.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+do_is_allocated() {
+    local start=$1
+    local size=$2
+    local step=$3
+    local count=$4
+
+    for ((i=1;i<=$count;i++)); do
+        echo "alloc $(( start + (i - 1) * step )) $size"
+    done
+}
+
+is_allocated() {
+    do_is_allocated "$@" | $QEMU_IO "$TEST_IMG" | _filter_qemu_io
+}
+
+do_io() {
+    local op=$1
+    local start=$2
+    local size=$3
+    local step=$4
+    local count=$5
+    local pattern=$6
+
+    echo "=== IO: pattern $pattern" >&2
+    for ((i=1;i<=$count;i++)); do
+        echo "$op -P $pattern $(( start + (i - 1) * step )) $size"
+    done
+}
+
+io_pattern() {
+    do_io "$@" | $QEMU_IO "$TEST_IMG" | _filter_qemu_io
+}
+
+io() {
+    local start=$2
+    local pattern=$(( (start >> 9) % 256 ))
+
+    do_io "$@" $pattern | $QEMU_IO "$TEST_IMG" | _filter_qemu_io
+}
+
+io_zero() {
+    do_io "$@" 0 | $QEMU_IO "$TEST_IMG" | _filter_qemu_io
+}
+
+io_test() {
+    local op=$1
+    local offset=$2
+    local cluster_size=$3
+
+    local num_large=$4
+    local num_medium=$((num_large * num_large))
+    local num_small=$((4 * num_medium))
+
+    local half_cluster=$((cluster_size / 2))
+    local quarter_cluster=$((cluster_size / 4))
+    local l2_size=$((cluster_size * cluster_size / 8))
+
+    # Complete clusters
+    io "$op" $offset $cluster_size $cluster_size $num_small
+    offset=$((offset + num_small * $cluster_size))
+
+    # From somewhere in the middle to the end of a cluster
+    io "$op" $((offset + $half_cluster)) $half_cluster $cluster_size $num_small
+    offset=$((offset + num_small * $cluster_size))
+
+    # From the start to somewhere in the middle of a cluster
+    io "$op" $offset $half_cluster $cluster_size $num_small
+    offset=$((offset + num_small * $cluster_size))
+
+    # Completely misaligned (and small)
+    io "$op" $((offset + $quarter_cluster)) $half_cluster $cluster_size $num_small
+    offset=$((offset + num_small * $cluster_size))
+
+    # Spanning multiple clusters
+    io "$op" $((offset + $half_cluster)) $((cluster_size * 2)) $((cluster_size * 3)) $num_medium
+    offset=$((offset + num_medium * 3 * $cluster_size))
+
+    # Spanning multiple L2 tables
+    # L2 table size: 512 clusters of 4k = 2M
+    offset=$(( ((offset + l2_size - 1) & ~(l2_size - 1)) - (3 * half_cluster) ))
+    io "$op" $offset $((6 * half_cluster)) $(( l2_size + half_cluster )) $num_large
+    offset=$((offset + num_large * ( l2_size + half_cluster )))
+}
+
+io_test2() {
+    local orig_offset=$1
+    local cluster_size=$2
+    local num=$3
+
+    # Pattern (repeat after 9 clusters):
+    #        used - used - free - used - compressed - compressed -
+    #        free - free - compressed
+
+    # Write the clusters to be compressed
+    echo '=== Clusters to be compressed [1]'
+    io_pattern writev $((offset + 4 * $cluster_size)) $cluster_size $((9 * $cluster_size)) $num 165
+    echo '=== Clusters to be compressed [2]'
+    io_pattern writev $((offset + 5 * $cluster_size)) $cluster_size $((9 * $cluster_size)) $num 165
+    echo '=== Clusters to be compressed [3]'
+    io_pattern writev $((offset + 8 * $cluster_size)) $cluster_size $((9 * $cluster_size)) $num 165
+
+    mv "$TEST_IMG" "$TEST_IMG.orig"
+    $QEMU_IMG convert -f $IMGFMT -O $IMGFMT -c "$TEST_IMG.orig" "$TEST_IMG"
+
+    # Write the used clusters
+    echo '=== Used clusters [1]'
+    io_pattern writev $((offset + 0 * $cluster_size)) $cluster_size $((9 * $cluster_size)) $num 165
+    echo '=== Used clusters [2]'
+    io_pattern writev $((offset + 1 * $cluster_size)) $cluster_size $((9 * $cluster_size)) $num 165
+    echo '=== Used clusters [3]'
+    io_pattern writev $((offset + 3 * $cluster_size)) $cluster_size $((9 * $cluster_size)) $num 165
+
+    # Read them
+    echo '=== Read used/compressed clusters'
+    io_pattern readv $((offset + 0 * $cluster_size)) $((2 * $cluster_size)) $((9 * $cluster_size)) $num 165
+    io_pattern readv $((offset + 3 * $cluster_size)) $((3 * $cluster_size)) $((9 * $cluster_size)) $num 165
+    io_pattern readv $((offset + 8 * $cluster_size)) $((1 * $cluster_size)) $((9 * $cluster_size)) $num 165
+
+    echo '=== Read zeros'
+    io_zero readv $((offset + 2 * $cluster_size)) $((1 * $cluster_size)) $((9 * $cluster_size)) $num
+    io_zero readv $((offset + 6 * $cluster_size)) $((2 * $cluster_size)) $((9 * $cluster_size)) $num
+}