selftests: drv-net: replace the nsim ring test with a drv-net one

We are trying to move away from netdevsim-only tests and towards
tests which can be run both against netdevsim and real drivers.

Replace the simple bash script we have for checking ethtool -g/-G
on netdevsim with a Python test tweaking those params as well
as channel count.

The new test is not exactly equivalent to the netdevsim one,
but real drivers don't often support random ring sizes,
let alone modifying max values via debugfs.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20251029164930.2923448-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 0 insertions, 85 deletions

diff --git a/tools/testing/selftests/drivers/net/netdevsim/ethtool-ring.sh b/tools/testing/selftests/drivers/net/netdevsim/ethtool-ring.sh
deleted file mode 100755
index c969559ffa7a..000000000000
--- a/tools/testing/selftests/drivers/net/netdevsim/ethtool-ring.sh
+++ /dev/null
@@ -1,85 +0,0 @@
-#!/bin/bash
-# SPDX-License-Identifier: GPL-2.0-only
-
-source ethtool-common.sh
-
-function get_value {
-    local query="${SETTINGS_MAP[$1]}"
-
-    echo $(ethtool -g $NSIM_NETDEV | \
-        tail -n +$CURR_SETT_LINE | \
-        awk -F':' -v pattern="$query:" '$0 ~ pattern {gsub(/[\t ]/, "", $2); print $2}')
-}
-
-function update_current_settings {
-    for key in ${!SETTINGS_MAP[@]}; do
-        CURRENT_SETTINGS[$key]=$(get_value $key)
-    done
-    echo ${CURRENT_SETTINGS[@]}
-}
-
-if ! ethtool -h | grep -q set-ring >/dev/null; then
-    echo "SKIP: No --set-ring support in ethtool"
-    exit 4
-fi
-
-NSIM_NETDEV=$(make_netdev)
-
-set -o pipefail
-
-declare -A SETTINGS_MAP=(
-    ["rx"]="RX"
-    ["rx-mini"]="RX Mini"
-    ["rx-jumbo"]="RX Jumbo"
-    ["tx"]="TX"
-)
-
-declare -A EXPECTED_SETTINGS=(
-    ["rx"]=""
-    ["rx-mini"]=""
-    ["rx-jumbo"]=""
-    ["tx"]=""
-)
-
-declare -A CURRENT_SETTINGS=(
-    ["rx"]=""
-    ["rx-mini"]=""
-    ["rx-jumbo"]=""
-    ["tx"]=""
-)
-
-MAX_VALUE=$((RANDOM % $((2**32-1))))
-RING_MAX_LIST=$(ls $NSIM_DEV_DFS/ethtool/ring/)
-
-for ring_max_entry in $RING_MAX_LIST; do
-    echo $MAX_VALUE > $NSIM_DEV_DFS/ethtool/ring/$ring_max_entry
-done
-
-CURR_SETT_LINE=$(ethtool -g $NSIM_NETDEV | grep -i -m1 -n 'Current hardware settings' | cut -f1 -d:)
-
-# populate the expected settings map
-for key in ${!SETTINGS_MAP[@]}; do
-    EXPECTED_SETTINGS[$key]=$(get_value $key)
-done
-
-# test
-for key in ${!SETTINGS_MAP[@]}; do
-    value=$((RANDOM % $MAX_VALUE))
-
-    ethtool -G $NSIM_NETDEV "$key" "$value"
-
-    EXPECTED_SETTINGS[$key]="$value"
-    expected=${EXPECTED_SETTINGS[@]}
-    current=$(update_current_settings)
-
-    check $? "$current" "$expected"
-    set +x
-done
-
-if [ $num_errors -eq 0 ]; then
-    echo "PASSED all $((num_passes)) checks"
-    exit 0
-else
-    echo "FAILED $num_errors/$((num_errors+num_passes)) checks"
-    exit 1
-fi