[PATCH net-next v7 08/26] selftests/vsock: improve logging in vmtest.sh

21 Oct 2025

From: Bobby Eshleman bobbyeshleman@meta.com
Improve usability of logging functions. Remove the test name prefix from
logging functions so that logging calls can be made deeper into the call
stack without passing down the test name or setting some global. Teach
log function to accept a LOG_PREFIX variable to avoid unnecessary
argument shifting.
Remove log_setup() and instead use log_host(). The host/guest prefixes
are useful to show whether a failure happened on the guest or host side,
but "setup" doesn't really give additional useful information. Since all
log_setup() calls happen on the host, lets just use log_host() instead.
Signed-off-by: Bobby Eshleman bobbyeshleman@meta.com
---
Changes in v7:
- do not use log levels, keep as on/off switch, after revising
  this patch series the levels became unnecessary. Could be added
  latter if it becomes useful.
---
 tools/testing/selftests/vsock/vmtest.sh | 69 ++++++++++++++-------------------
 1 file changed, 29 insertions(+), 40 deletions(-)

diff --git a/tools/testing/selftests/vsock/vmtest.sh b/tools/testing/selftests/vsock/vmtest.sh
index edacebfc1632..561600814bef 100755
--- a/tools/testing/selftests/vsock/vmtest.sh
+++ b/tools/testing/selftests/vsock/vmtest.sh
@@ -271,60 +271,51 @@ EOF
host_wait_for_listener() {
    wait_for_listener "${TEST_HOST_PORT_LISTENER}" "${WAIT_PERIOD}" "${WAIT_PERIOD_MAX}"
-}
-
-__log_stdin() {
-	cat | awk '{ printf "%s:\t%s\n","'"${prefix}"'", $0 }'
-}
-__log_args() {
-	echo "$*" | awk '{ printf "%s:\t%s\n","'"${prefix}"'", $0 }'
 }
log() {
-	local prefix="$1"
+	local redirect
+	local prefix
-	shift
-	local redirect=
    if [[ ${VERBOSE} -eq 0 ]]; then
    	redirect=/dev/null
    else
    	redirect=/dev/stdout
    fi
+	prefix="${LOG_PREFIX:-}"
+
    if [[ "$#" -eq 0 ]]; then
-		__log_stdin | tee -a "${LOG}" > ${redirect}
+		if [[ -n "${prefix}" ]]; then
+			cat | awk -v prefix="${prefix}" '{printf "%s: %s\n", prefix, $0}'
+		else
+			cat
+		fi
    else
-		__log_args "$@" | tee -a "${LOG}" > ${redirect}
-	fi
-}
-
-log_setup() {
-	log "setup" "$@"
+		if [[ -n "${prefix}" ]]; then
+			echo "${prefix}: " "$@"
+		else
+			echo "$@"
+		fi
+	fi | tee -a "${LOG}" > ${redirect}
 }
log_host() {
-	local testname=$1
-
-	shift
-	log "test:${testname}:host" "$@"
+	LOG_PREFIX=host log $@
 }
log_guest() {
-	local testname=$1
-
-	shift
-	log "test:${testname}:guest" "$@"
+	LOG_PREFIX=guest log $@
 }
test_vm_server_host_client() {
-	local testname="${FUNCNAME[0]#test_}"
vm_ssh -- "${VSOCK_TEST}" \
    	--mode=server \
    	--control-port="${TEST_GUEST_PORT}" \
    	--peer-cid=2 \
-		2>&1 | log_guest "${testname}" &
+		2>&1 | log_guest &
vm_wait_for_listener "${TEST_GUEST_PORT}"
@@ -332,18 +323,17 @@ test_vm_server_host_client() {
    	--mode=client \
    	--control-host=127.0.0.1 \
    	--peer-cid="${VSOCK_CID}" \
-		--control-port="${TEST_HOST_PORT}" 2>&1 | log_host "${testname}"
+		--control-port="${TEST_HOST_PORT}" 2>&1 | log_host
return $?
 }
test_vm_client_host_server() {
-	local testname="${FUNCNAME[0]#test_}"
${VSOCK_TEST} \
    	--mode "server" \
    	--control-port "${TEST_HOST_PORT_LISTENER}" \
-		--peer-cid "${VSOCK_CID}" 2>&1 | log_host "${testname}" &
+		--peer-cid "${VSOCK_CID}" 2>&1 | log_host &
host_wait_for_listener
@@ -351,19 +341,18 @@ test_vm_client_host_server() {
    	--mode=client \
    	--control-host=10.0.2.2 \
    	--peer-cid=2 \
-		--control-port="${TEST_HOST_PORT_LISTENER}" 2>&1 | log_guest "${testname}"
+		--control-port="${TEST_HOST_PORT_LISTENER}" 2>&1 | log_guest
return $?
 }
test_vm_loopback() {
-	local testname="${FUNCNAME[0]#test_}"
    local port=60000 # non-forwarded local port
vm_ssh -- "${VSOCK_TEST}" \
    	--mode=server \
    	--control-port="${port}" \
-		--peer-cid=1 2>&1 | log_guest "${testname}" &
+		--peer-cid=1 2>&1 | log_guest &
vm_wait_for_listener "${port}"
@@ -371,7 +360,7 @@ test_vm_loopback() {
    	--mode=client \
    	--control-host="127.0.0.1" \
    	--control-port="${port}" \
-		--peer-cid=1 2>&1 | log_guest "${testname}"
+		--peer-cid=1 2>&1 | log_guest
return $?
 }
@@ -399,25 +388,25 @@ run_test() {
host_oops_cnt_after=$(dmesg | grep -i 'Oops' | wc -l)
    if [[ ${host_oops_cnt_after} -gt ${host_oops_cnt_before} ]]; then
-		echo "FAIL: kernel oops detected on host" | log_host "${name}"
+		echo "FAIL: kernel oops detected on host" | log_host
    	rc=$KSFT_FAIL
    fi
host_warn_cnt_after=$(dmesg --level=warn | wc -l)
    if [[ ${host_warn_cnt_after} -gt ${host_warn_cnt_before} ]]; then
-		echo "FAIL: kernel warning detected on host" | log_host "${name}"
+		echo "FAIL: kernel warning detected on host" | log_host
    	rc=$KSFT_FAIL
    fi
vm_oops_cnt_after=$(vm_ssh -- dmesg | grep -i 'Oops' | wc -l)
    if [[ ${vm_oops_cnt_after} -gt ${vm_oops_cnt_before} ]]; then
-		echo "FAIL: kernel oops detected on vm" | log_host "${name}"
+		echo "FAIL: kernel oops detected on vm" | log_host
    	rc=$KSFT_FAIL
    fi
vm_warn_cnt_after=$(vm_ssh -- dmesg --level=warn | wc -l)
    if [[ ${vm_warn_cnt_after} -gt ${vm_warn_cnt_before} ]]; then
-		echo "FAIL: kernel warning detected on vm" | log_host "${name}"
+		echo "FAIL: kernel warning detected on vm" | log_host
    	rc=$KSFT_FAIL
    fi
@@ -452,10 +441,10 @@ handle_build
echo "1..${#ARGS[@]}"
-log_setup "Booting up VM"
+log_host "Booting up VM"
 vm_start
 vm_wait_for_ssh
-log_setup "VM booted up"
+log_host "VM booted up"
cnt_pass=0
 cnt_fail=0
-- 
2.47.3



    

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[PATCH net-next v7 08/26] selftests/vsock: improve logging in vmtest.sh